Article catalogue:
- 1 、Classification of common defects in injection molding products of injection molding machine
- 2 、What are the classifications of pneumatic tools
- 3 、What are the characteristics of pneumatic construction
- 4 、Printing quality guarantee
- 5 、Tianjin Carton Factory?
Classification of common defects in injection molding products of injection molding machine
1. Shrinking
Plastic products appear in the surface of the depression, voids are called shrinkage, shrinkage not only affects the appearance of the product, but also reduces the quality and strength of the product, general shrinkage is also the most likely to occur in the molding process. The reason for shrinkage is related to molding technology, mold design and the use of plastics.
1, different plastics have their own shrinkage, the following table for reference materials, usually easy to shrink raw materials are crystalline, such as nylon, 100-fold glue, and so on, in the injection process, crystalline plastic heated to show a fluid state, molecules show irregular arrangement, when injected into the colder mold cavity, plastic molecules will be neatly arranged into crystals, as a result, the volume shrinks less than the prescribed size range, that is, shrinkage.
2. Ejection technology
In terms of injection technical control, shrinkage occurs: insufficient pressure, too slow injection speed, too small gate or too long gate, resulting in uneven flow of molten plastic during injection. Therefore, when using the ejector, we must pay attention to the forming conditions and whether the pressure is enough to prevent the problem of shrinkage.
3. Mold and product design:
The runner design and cooling device of the mold also have a great impact on the finished product. Due to the poor heat transfer capacity of the plastic, the farther away from the mold wall, the thicker the solidification and cooling is slower, there should be enough plastic to fill the mold cavity, so that when the screw of the ejector is ejected or holding pressure, the plastic will not flow back and reduce the pressure. on the other hand, the nozzle should not be condensed too fast, lest the semi-solidified plastic block the flow channel and cause the product to shrink. The plastic flow process in different moulds has different shrinkage, the temperature of the barrel is properly controlled to prevent the plastic parts from overheating, and the extension of the cycle can ensure that the products have sufficient time to cool.
If the shrinkage problem is solved, the quality of finished products can be improved, the secondary waste can be reduced and the production efficiency can be improved.
Second, the finished product demoulding is difficult (mucous membrane)
In the injection molding, the finished product will have mucous membrane, first of all, we should consider whether the injection pressure and holding pressure is too high. Too high injection pressure will cause over-saturation of the finished product and fill the plastic into other gaps, resulting in difficult demoulding of the finished product in the mold hole, and it is easy to have mucous membrane when taking out the product.
When the temperature of the material pipe is too high, there will be two situations: one is that the plastic decomposes and deteriorates when it is heated, making it lose its original characteristics, and break or break in the demoulding process, resulting in mucous membrane. Second, the rubber material is not easy to cool after filling into the mold cavity, so it is necessary to prolong the cycle time and reduce the economic benefit. Therefore, it is necessary to adjust the operating temperature of the plastic according to its characteristics. If the mold gate is not balanced, the cooling rate of the finished product will be different. Therefore, the finished product has mucous membrane phenomenon during demoulding.
Third, mucous membrane of glue canal
The sprue mucosa generally shows that after opening the mold, the nozzle sticks to the upper mold sprue or is easy to break on the sprue, resulting in the defects of the next mold product.
Fourth, there are pores in the finished product
In the process of injection molding, sometimes there are many small bubbles in the finished product, which not only affects the strength and mechanical properties of the product, but also greatly reduces the appearance value of the finished product. So when there are bubbles in the finished product, you can check the following factors and deal with them accordingly.
Usually, due to the different thickness of the finished product, or when the mold has protruding ribs, the cooling rate of the plastic in the mold is different, the degree of shrinkage is different, and it is easy to form bubbles, so special attention should be paid to the design of the mold.
In the use of raw materials, if there is water vapor in the plastic, the plastic is heated and decomposed when the glue is melted, and the water vapor is heated to form a gas, which will form bubbles in the product because it is too late to eliminate it. If the tolerance of the glue injection screw is too small, the air is easy to enter the mold cavity to form bubbles.
5. Deformation of the finished product
Most of the warping or dimensional deviation of the plastic products belong to the deformation of the finished product, such as too fast ejection, too high mold temperature, uneven mold temperature and asymmetric runner system, etc. Two of the biggest possibilities are: 1. The thickness of the plastic part is uneven or the corner is not smooth enough, so it can not cool and shrink evenly, resulting in warping deformation. 2. For some flat plastic, the runner gate must be set on the edge of the product in order to have a beautiful surface. When shooting glue, the molten plastic can only be shot into the mold cavity at a high speed from one side, so the plastic molecules solidified in the mold cavity are straightened to the same direction (called orientation). At this time, the internal stress of the plastic part is very large: it is pulled back to its original state during demoulding, resulting in deformation).
In order to make the molten plastic fill the mold cavity smoothly, the design should avoid the following points as far as possible:
1. The thickness of the same plastic part is too different.
2. There is excessive acute angle.
3. The slow zone is too short, which makes the thickness change very different.
From the analysis of the gate, the design of the mold should ensure that the plastic can enter the mold cavity smoothly, so the shunt channel should avoid turning at right angles, and there should be a curved transition zone as far as possible, so the short and thick shunt channel is the most ideal. it helps to reduce fluid resistance and fluid orientation. It should also be considered that too large runners will increase waste and affect the appearance of the products.
In addition, in order to avoid deformation caused by difficult demoulding due to different tightness of plastics during filling, the cross-sectional area shape of the shunt channel should be changed according to the amount of glue injected and the shape of the product. After the part of the shunt channel which is difficult to form is thickened, the sprue should also be enlarged accordingly, so that the cross-sectional area of the mainstream channel is equal to or larger than the total cross-sectional area of the shunt channel.
In addition, there are two noteworthy problems, one is the form of plastic ejection device, if there is too little thimble equipment, it is also easy to cause deformation and warping, but too many ejector pins will affect the appearance of the finished product, so you can consider pushing the plate at this time. The second is the design of the cooling channel of the mold cavity, which should be able to make the whole plastic parts shrink evenly and improve the product quality.
Crazing and bubbles
The formation of shooting lines is generally due to the injection starting too fast, so that the air in the front part of the mold cavity can not be pressed and excluded by the rubber melt, and the air is mixed in the rubber material, making the surface luster and color of the products uneven, which is the so-called shooting lines, which not only affects the appearance, but also reduces the mechanical strength of the finished products a lot. Therefore, in order to avoid this defect, we must find out the reason and improve it.
Since the formation of the pattern is the gas contained in the melt plastic, the main sources of this gas are as follows:
(1) the plastic itself contains water or oil:
Because the plastic is exposed to the air during the manufacturing process, inhaled water vapor or oil, or mixed with some wrong proportions, these volatile substances are heated to produce gas when melting glue.
(2) Thermal decomposition of raw materials:
If the temperature, back pressure and melting speed of the screw barrel are set too high, or the molding period is too long, the heat-sensitive materials such as PVC, plug steel, and PC are easily decomposed at high temperature to produce gas.
(3) Air
There is air between the plastic particles and the particles, and if the temperature of the screw barrel is set too high at the entrance of the glue, the surface of the plastic will melt and stick together without compression, then the air between the plastic particles can not be completely removed.
Therefore, the ideal plastic products can only be obtained by drying the plastic and using the appropriate melting temperature and speed, together with the appropriate back pressure. In addition, mold design is also a very important link. Usually, if the flow channel is very large and the injection port is very small, the chance of gas entering the mold cavity will be reduced.
In the injection molding technology, there is a way to prevent the occurrence of shooting lines. In the structure of the mold, there is a pressurizing equipment and a compressed air intake hole. After locking the mold, the compressed air enters the mold, which increases the air pressure in the mold cavity. When the molten plastic enters the high-pressure mold, the stomata of the mold begin to exhaust, and then maintain a certain pressure in the mold cavity and increase the air pressure in the mold, which can really avoid the probability of shooting lines. For example, the ordinary injection method will appear when the moisture content of ABS is 0.1%, while gradually increasing the air pressure in the mold can deal with the ABS with high moisture content and will not appear.
7. Mao Bian and that Peak
Rough edge (commonly known as Bifeng) is a common injection problem in the process of injection molding. When the plastic is under too much pressure in the mold cavity, the parting force is greater than the clamping force, thus forcing the mold to open, extruding the plastic and forming a peak on the surface of the plastic part. However, there are many causes of this problem, such as plastic, damage to the injection molding machine, or improper adjustment, so it is not easy to find a solution. Because the viscosity of plastics will affect its flow speed and pressure loss, too high or too low viscosity may cause rough edges. If the viscosity of the plastic is too low, its fluidity is high, and it is easy to flow to the tiny gap between the mold surfaces, increasing the parting force until the peak appears.
Generally speaking, plastic temperature has a great influence on viscosity, and pressure and shear rate also have an effect on pressure. If the temperature of the plastic is increased, its viscosity decreases, while when the temperature is lowered, its viscosity increases.
Another problem with plastics is their drying condition and whether they are mixed with impurities. Some plastics, such as nylon or ABS, have properties that affect plastics. As for polycarbonate, although it does not absorb water, its properties are also sensitive to surface moisture, so during molding, many plastics have to be dried in order to correctly control their properties. If sundries are mixed into plastics, or different kinds of plastics are mixed, it is more difficult to predict the performance of plastics.
The pressure of the plastic in the mold cavity changes with the filling of the mold cavity. Before the mold cavity is filled, the pressure at the front end of the melt is almost zero, and the pressure at the injection port is higher than that in other parts of the mold cavity, but when the mold cavity is fully filled, the pressure loss of plastic flow no longer exists. the pressure in the whole mold cavity becomes the same static pressure, so the force to force the mold to open will be greatly increased, causing rough edges, in order to avoid this phenomenon, once the mold cavity is filled The injection pressure must be adjusted to a lower holding pressure. In addition to correctly adjusting the pressure control system of the ejector, another auxiliary way is to reduce the injection speed first. In this way, the plastic at the front end of the melt has time to cool and locally solidify, thus avoiding the occurrence of rough edges. As the injection speed is too slow will also slow down production and some envelopes and other defects, it is best to adjust the injection speed must also be in line with the clamping force used. Otherwise, rough edges may also be produced.
If there is a problem with the mechanical structure of the ejector, it will be more complex and it will be more difficult to find the cause of the problem. For example, there is a deviation in the parallelism between the templates, or the force of the template pull rod is uneven, which will also cause the imbalance of the clamping force between the molds, resulting in the peak of the plastic parts in the position where the clamping force is weak. On the other hand, if the wear of the screw or melt drum is large, the melt may glide and countercurrent between the outer diameter of the thread and the barrel, resulting in incorrect switching point of the pressure position, resulting in local rough edges and insufficient glue injection.
In addition to the various factors mentioned above, rough edges will also appear if there are problems with the tooling. For example, if the die has been used for a long time, some positions have wear and tear, it is easy to have rough edges. Even some minor defects, such as the blockage of the exhaust hole, will cause an increase in the pressure in the mold cavity, and if the pressure is too high, there will be rough edges. In some multi-cavity moulds, if the runner design is not balanced, the flow of plastic will be asymmetrical. In order to avoid insufficient pressure in individual cavities, some other cavities may have rough edges.
VIII. Short shot of the finished product
Insufficient filling is a phenomenon that the molten material does not fully flow through every corner of the molding space.
The reasons for insufficient filling are unreasonable setting of forming conditions, incomplete design and production of moulds, and too thin meat thickness of molded products. The countermeasure of forming condition is to increase the molding temperature and mold temperature of the material, increase the injection pressure, injection speed and improve the fluidity of the material. In the mold, the size of the injection channel or runner can be increased, or the location, size, location and number of gates can be increased to make the molten material flow easily. In order to make the gas in the forming space evacuate smoothly, the exhaust hole should be set up in the appropriate position.
IX. Combination line
The bonding line is a thin line formed by two or more confluent parts of the molten glue material. The reasons for the occurrence of the bonding line are as follows:
(1) the flow mode of the material caused by the shape of the molded product (mold structure)
(2) the fluidity of molten materials is poor.
(3) Foreign bodies such as air, volatiles or release agents are involved at the confluence of molten materials.
The bonding line is caused by the fact that the temperature of this part of the material is particularly low when the front part of the flowing material converges, and the confluence part is not fully fused. The window and hole periphery of the molded products will inevitably cause the confluence of materials and produce bonding lines. When the fluidity of the material is particularly good, the bonding line can hardly be seen. At the same time, the material temperature and mold temperature can be increased, and the position of the bonding line can also be moved elsewhere. Or set up exhaust vents in the fusion part to quickly evacuate this part of the air and volatiles. Or setting up the overflow pool at the fusion site and removing it afterwards are all effective countermeasures.
The bonding line not only hinders the appearance of the molded products, but also is not conducive to the strength of the molded products. The bonding strength of the unreinforced plastics without fillers such as glass fiber is about the same as that of other parts. However, the glass fiber reinforced plastic (FRTP) does not melt in the fusion part, and the strength of this part is often very low.
Poor gloss of the molded surface
The formed surface loses the original luster of the material, forms a milky white film, and becomes blurred, etc., all of which can become poor surface gloss.
The poor gloss of the molded surface is mostly caused by the surface state of the mold. when the grinding of the mold surface is poor, the surface of the molded product certainly can not get a good luster. However, when the surface condition of the mold is good, the surface gloss of the product can be improved by increasing the material temperature and the mold temperature. The use of too many release agents or greasy release agents is also one of the reasons for poor surface gloss.
11. Black stripes
Black stripes are black stripes on molded products, which are mainly caused by thermal decomposition of materials, which are often found in materials with poor thermal stability.
The effective countermeasure to prevent the occurrence of black lines is to prevent the material temperature in the barrel from being too high and slow down the injection speed. If there is a scar or notch on the inner wall of the barrel or screw, the material attached to this part will overheat and cause thermal decomposition. The anti-reverse ring will also cause thermal decomposition due to plastic decomposition, so materials with high viscosity and easy decomposition should pay special attention to prevent the occurrence of black lines. The friction between iron and iron caused by eccentricity of pipe and screw will lead to blackening and black lines.
12. Flow pattern
The trace of the flow of the molten material in the flow pattern, the stripe appearance with the gate as the center.
When the flow pattern initially flows into the molding space, the plastic cools too fast, which is caused by the formation of a boundary between the material and the subsequent inflow of materials. In order to prevent the flow pattern, the temperature of the plastic can be increased, the flow performance of the plastic can be improved and the injection speed can be adjusted.
The cold plastic left in the front of the nozzle of the injection molding machine will leave a mark if it enters the molding space directly, so a sufficient retention part (cold well) is designed at the confluence of the injection and the runner or at the junction of the runner. It can not only effectively prevent the occurrence of remaining marks, but also increase the size of the gate to prevent it.
XIII. Rupture of the finished product during mold opening or ejection
When there is a hairy crack on the surface of the finished product when it is broken, and when the molded product has a sharp angle, this part often has a fine crack that is not easy to see, and finally it is broken by the interference of external force in the ejection or mold opening. the crack is one of the fatal defects of the finished product.
(1) it is not easy to release the mold.
(2) caused by overfilling
(3) the mold temperature is too low.
(4) caused by defects in the structure of molded products
If you want to avoid cracks caused by poor demoulding. The mold space must have sufficient demoulding angle, and check the size, position and form of the ejector pin. During ejection, the demoulding resistance of each part of the finished product should be uniform.
Excessive filling means that excessive injection pressure or excessive material measurement is applied during injection molding, resulting in cracks during demoulding. In this state, the deformation of mold parts is also increased, which makes it more difficult to demoulding and facilitate the occurrence of rupture. At this time, it is appropriate to reduce the injection pressure to prevent over-filling.
The part of the gate is often easy to remain excessive internal stress, and it is easy to be brittle near the gate, especially the part of the direct gate, which is easy to break due to internal stress, such as cup-shaped or bowl-shaped products, easy to take the gate as the center and produce radial cracks.
What are the classifications of pneumatic tools
The simple categories are as follows:
1. Assembly category: pneumatic screwdriver (wind batch), wind wrench, wind cannon, ratchet wrench, punch wrench, fixed twist wind batch, fixed twist wrench
two。 Grinding category: pneumatic disc sandpaper machine, square sandpaper machine, miniature sandpaper machine, special-shaped sandpaper machine, eight-lobe sanding machine, pneumatic belt machine, pneumatic sanding machine, pneumatic polishing machine
3. Grinding category: pneumatic angle grinder, engraving grinder (straight shank grinder), engraving pen (pen grinder), pneumatic file, ultrasonic file machine
4. Drilling: straight air drill, portable gun-shaped air drill, right-angle elbow gas drill, professional aviation air drill, deflection air drill
5. Tapping thread category: portable pneumatic tapping machine, desktop mechanical arm set tapping machine, portable pneumatic tapping machine
6. Stone tools: pneumatic water mill, pneumatic stone cutting machine
7. Riveting: pneumatic cap gun (riveting nut gun), pneumatic nail gun (core riveting gun)
8. Shearing: pneumatic shears, pneumatic crimping pliers, pneumatic saws
9. Painting category: spray gun, oil pump, coating pipe, air pipe, pneumatic pressure barrel, pneumatic mixer
10. Nail gun category: straight nail gun (F30/F50/T50), yard nail gun (1013J/1013F/422J/1022J/440K/N851), steel nail gun (ST64/MS-1619), nail rolling gun
(CN60/CN70/CN100/CN130), pneumatic box sealing machine (1935/2235/SP50-10B-A), type C gun, clip gun, pushpin gun, etc.
11. Tamping category: air shovel, air pick, needle rust remover, pneumatic rock drill.
What are the characteristics of pneumatic construction
Question 1: what are the current locations of the types of pneumatic tools: home page? Weimar Product Center
Weimar Product Center
Pneumatic wrench
Wind cannon
Pneumatic screwdriver / air batch
Pneumatic grinder / pneumatic sandpaper machine
Pneumatic grinder / engraving pen
Paint spray gun / diaphragm pump
Nail gun
Pneumatic nail gun
Air shovel / hammer
Air drill
Pneumatic cap gun
Pneumatic nail gun
Pneumatic yellowing machine
Pneumatic angle grinder
Air shear / thread pressing forceps
Question 2: pneumatic tools Daquan Pneumatic tools Classification Pneumatic tools there are more types of pneumatic tools, it is impossible to count the specific number, but it can be roughly divided into four categories, details are as follows.
1, assembly class, including: pneumatic screwdriver, wind wrench (commonly known as small wind gun), air gun, pneumatic ratchet wrench, pneumatic piercing wrench, pneumatic nail gun, pneumatic cap gun, pneumatic rivet gun, pneumatic drill (some products are called pneumatic threading machine), pneumatic tapping machine, air nail gun.
Grinding, including: pneumatic sandpaper machine (including disc sandpaper machine, square sandpaper machine, small grinder, point grinder, pneumatic triangle sandpaper machine, zigzag sandpaper machine, special-shaped sandpaper machine), pneumatic octagonal sand (also known as octagonal sandpaper machine), pneumatic belt machine, pneumatic saw, pneumatic file machine, pneumatic water mill (marble water mill), pneumatic polishing machine, pneumatic wire drawing machine, wind 2, grinding machine (engraving machine) Wind grinding pen (engraving grinding pen), pneumatic angle grinder.
3, spraying category, including: paint gun, pneumatic pressure bucket (automatic paint bucket), pneumatic pump, pneumatic mixer.
4. Other types, including: air shears, pneumatic pressing pliers, air shovels, pneumatic rust removers, pneumatic picks, pneumatic rock drills, etc.
Of course, each subcategory can be subdivided into many products with different uses. For example, pneumatic screwdrivers include straight type, elbow type and gun type. According to the structure, there are two types: impact type and fixed torsion type. The complex composition of pneumatic tool products is also due to the ever-changing application fields, it is possible to derive a corresponding pneumatic tool product from a station. But sometimes, although they are all screws, it is very easy to use one model in this industry, but it may break down in a few days for another industry to use. Therefore, thousands of products of pneumatic tools also have to be used in the ever-changing industry.
Question 3: what are the types of pneumatic tools? there are pneumatic wrenches, pistol drills, pull riveting guns and so on. If you go to the hardware City, you will know everything if you want a sample of pneumatic tools!
Question 4: what are the simple classifications of pneumatic tools as follows:
1. Assembly category: pneumatic screwdriver (wind batch), wind wrench, wind cannon, ratchet wrench, punch wrench, fixed twist wind batch, fixed twist wrench
two。 Grinding category: pneumatic disc sandpaper machine, square sandpaper machine, miniature sandpaper machine, special-shaped sandpaper machine, eight-lobe sanding machine, pneumatic belt machine, pneumatic sanding machine, pneumatic polishing machine
3. Grinding category: pneumatic angle grinder, engraving grinder (straight shank grinder), engraving pen (pen grinder), pneumatic file, ultrasonic file machine
4. Drilling: straight air drill, portable gun-shaped air drill, right-angle elbow gas drill, professional aviation air drill, deflection air drill
5. Tapping thread category: portable pneumatic tapping machine, desktop mechanical arm set tapping machine, portable pneumatic tapping machine
6. Stone tools: pneumatic water mill, pneumatic stone cutting machine
7. Riveting: pneumatic cap gun (riveting nut gun), pneumatic nail gun (core riveting gun)
8. Shearing: pneumatic shears, pneumatic crimping pliers, pneumatic saws
9. Painting category: spray gun, oil pump, coating pipe, air pipe, pneumatic pressure barrel, pneumatic mixer
10. Nail gun category: straight nail gun (F30/F50/T50), yard nail gun (1013J/1013F/422J/1022J/440K/N851), steel nail gun (ST64/MS-1619), nail rolling gun
(CN60/CN70/CN100/CN130), pneumatic box sealing machine (1935/2235/SP50-10B-A), type C gun, clip gun, pushpin gun, etc.
11. Tamping category: air shovel, air pick, needle rust remover, pneumatic rock drill.
Question 5: what are pneumatic tools the same as pneumatic tools? pneumatic tools use compressed gas as a power tool, also known as pneumatic tools. So pneumatic tools are the same as pneumatic tools, which are two names for the same object. The work is carried out by using compressed air to cause different movements of parts such as pistons.
Question 6: what brand of pneumatic tools is best to use? Weima pneumatic tools have been adhering to the original imported quality from Taiwan for 15 years. Weima pneumatic tools have joined hands with more than 1000 stores and retailers, and the service network covers the whole country and even the whole Southeast Asian region.
Question 7: which industries will use pneumatic tools? In a hurry! Furniture factory, sheet metal factory, wheel factory, spray paint factory and so on will use pneumatic tools, because pneumatic tools have strong adaptability to the environment, can work reliably in a wide temperature range, humid and dusty environment, a little leakage will not pollute the environment, there is no risk of fire and explosion, the use of safety provided by Ningbo Flatters.
Question 8: what are the famous brands of pneumatic tools at home and abroad? Solan pneumatic tools in England, East Pneumatic tools in Japan, Atlas pneumatic tools in Sweden, Cooper pneumatic tools in the United States, Festo pneumatic tools in Germany, Thunderhorse pneumatic tools in Taiwan, domestic Flatus pneumatic tools and so on.
Question 9: what are the seven advantages of pneumatic tools? 1 durable
2 there is no danger of electric shock
3The structure is simple.
(4) low maintenance cost
5 the explosive force is high
6 there are many kinds, all kinds of functions can use the same power source, air compressor
At present, there is no good power tool to replace the function of 7 nail gun.
Printing quality guarantee
Model printing quality assurance 1
Printing quality commitment when undertaking the printing business (business name XXXXXX) of Yunnan Tengchong Volcano Rehai Investment and Development Co., Ltd., we fully consult with the unit, cooperate actively, serve enthusiastically, and strive to meet the requirements of customers. The company completes the printing task in accordance with the national quality requirements, and makes the following commitment to the printing quality.
(1) the production materials and processes are in full compliance with the requirements of the company.
(2) the accuracy of the text is 100%, the arrangement is beautiful, and the format is in full compliance with the specification.
(3) the color of the printing picture is accurate, the handwriting is clear, the ink color is pure, moderate and consistent, the overprinting is accurate and consistent, and the white edge is retained in accordance with the prescribed requirements, free of dirt, wrinkle and breakage.
(3) the bookbinding is neat and firm, the cut is smooth, the size meets the standard and the quantity is accurate.
(4) No word drop, no broken page, no white page, no wrinkle, no inverted print, no misprint.
(5) the number of the printed sheet is accurate and the code is placed neatly.
(6) if the product does not meet customer requirements, the company will solve it on the spot. If it is a quality problem, we will reprint it within the shortest working day.
XXXXXXX Corp.
X month X day X year
Model printing quality assurance 2
According to the requirements of the bidding documents of the 20xx-2008 official printing fixed-point agreement procurement project (bid number: LCZ2007021), we solemnly promise during the validity period of the agreement:
First, adopt advanced printing press equipment to ensure the printing quality of printed matter.
Second, the printing process is operated in strict accordance with the technological process specifications, so that: 5 the overprinting is accurate, the allowable error is ±2 mm, the white edge meets the standard, and the permissible error is ±2 mm.
6 the handwriting is clear and solid, the ink color is pure, the shade is moderate, and the consistency is consistent; 7 there are no missing words, broken pages, white pages, wrinkles, backprints and misprints
The number of 8 printed sheets is accurate and neatly arranged.
Third, strengthen the technical training of all staff, constantly introduce new skills, and strictly grasp the level of quality inspection.
Fourth, if there are obvious quality problems of the finished products, the customer can refuse to accept or the company shall bear the responsibility of free reprinting.
We agree that the above commitment will be used as the inspection standard for the quality of our printed products by the purchasing units in the future.
This undertaking shall be valid from the date of our signature to the date of termination of the agreement
Commitment of binding quality
During the period of the agreement, we must do the following when binding all kinds of materials, forms, documents, headers and letterhead:
(2) the finished product is strictly in accordance with CY/T5-1999 standard:
A4 size: 210x 297mm1
16 Open data: 184*260mm
16 Open forms: 190*256mm or meet customer requirements
Within the error ≤ 1.5mm
(3) no dirt, no broken, no white, no more pages, no less pages, no upside down, no mixed loading; 4. The binding is flat, the nail spacing is appropriate, the glue can not fall off the page, stick the page, and the glue mouth is not more than 5mm.
5 the figures are accurate and neatly arranged
(6) when cutting, the high-precision full-computer program-controlled paper cutting machine is used to cut, the cutting size meets the standard, the allowable error is ±2 mm, the permissible error is ±3 degrees, and the permissible error is ±3 degrees.
(7) the finished product is clean, no corner, no knife, and the figure is accurate.
We agree that the above commitment will be used as the inspection standard for the quality of our printed products by the purchasing unit in the future.
9 this undertaking shall be valid from the date of our signature to the date of termination of the agreement. When binding all kinds of bills and documents, we must do the following:
1. When matching the pages of documents and bills, the relative positions of the upper, middle and lower paper, as well as the positive and negative sides of each link must be correct.
2. The finished product of continuous format bill has the wrong hole ≤ 1mm, and the binding page should be firmly bound.
Solid, it is not easy to detach. The printed text of the upper and lower parts should basically coincide with each other, with a deviation of ≤ 1mm.
3. Bills with numbers must be printed according to the starting and ending numbers and digits stipulated in the contract, and must not be omitted, interrupted, repeated, miscoded or illegible.
4. the adhesive part of a bill with adhesive requirements shall not fall off by itself, nor can it cause wrinkling or adhesion to other printed matter due to excessive use of glue.
5. The cover is correct, smooth and firm.
6. The cutting size meets the standard, the allowable error is ±2 mm, the permissible error is ±3 degrees, and the permissible error is ±3 degrees.
7. The finished product is clean, clean, corners-free, knife-free, and the figure is accurate.
8. when cutting carbon-free bills, special attention should be paid not to indentation and blurring the layout.
If it does not meet the above requirements, it must be reprinted or reprinted.
The following points must be done when binding books:
1. The positioning is that the distance between the nail eye of the nail saw and the length of the book core is 1, 4, respectively, and the allowable error is ±3.0mm.
Second, there are no broken nails, missing nails and heavy nails after booking. the books are neat and clean, the nails are flat and firm, the nail saws are nailed to the crease line, and the book posts are askew ≤ 2.0mm.
Third, the book is neat and tidy, and the size of the finished product should meet the requirements of GB/T 788. Non-standard size as required by the contract.
Fourth, after the finished product is cut, there is no serious knife, no continuous knife page, no serious broken head.
Fifth, the finished product has a neat appearance and no indentation.
Commitment of packing quality
We guarantee that during the period of the agreement, all kinds of materials, forms, documents, headers, letterhead, publications and brochures will achieve the following packaging quality:
When packing, the materials must be moistureproof, such as Kraft paper and plastic film wrapping paper.
Material
2 when bundling, the bundling quality is guaranteed to be non-leakage, non-breakage and binding.
The requirement of being strong and easy to carry
3 the product name, specification, quantity, manufacturer,
Batch number and in line with the GB191 “handle with care”, “afraid of wet” and other signs, do not collide and heavy pressure
4 products are not allowed to be thrown, smashed or trodden during transportation and storage
Rain, snow or liquid substances and mechanical damage
(5) if the above factors cause the printed matter to be unavailable, the Company undertakes to make up for its loss free of charge.
(6) if there is any outstanding matter, it shall be settled by both parties through consultation.
All kinds of documents and bills are of the following packing quality:
1. For bills without numbers, the allowable deviation of packing quantity is 6 copies, and each carton shall not exceed 2 pieces of decapitation. For printed matter that needs to be typed, there shall be no more than 3 decapitation in each case, and there shall be a clear mark at the decapitation. When required by the user, the broken end shall be connected with easy-to-tear tape.
2. Continuous format bills should be accompanied by a certificate in each case, and after packing with moistureproof materials
Seal the box and pack it with packing tape if necessary.
3. The product name, specification, quantity, start and stop number, manufacturer, batch number and signs such as “handle with care” and “afraid of dampness” in GB191 should be marked on the outside of the packing box, so as to avoid collision and heavy pressure.
4. Products are not allowed to be thrown, smashed or trodden during transportation and storage, and shall not be affected by rain, snow or liquid substances or mechanical damage.
5. If the printed matter cannot be supplied due to the above factors, the company undertakes to make up for its loss free of charge.
6. If there is any outstanding matter, it shall be settled by both parties through consultation.
Commitment of pre-sale and after-sales service
Our company must do the following in the pre-sales and after-sales service within the validity period of the agreement:
1. After receiving the purchase call from the purchasing unit, we have a special person to pick up the sample manuscript within 20 minutes (within the urban area) and make a detailed record of the printing requirements according to the customer’s requirements.
2. Free first school and resumption of school until correct customer confirmation
3. After we have signed a contract with the purchasing unit, the printed matter will be delivered within seven working days. If the actual printing volume is too large to complete the delivery within seven working days, we must consult with the purchasing unit and obtain the consent of the purchasing unit, and there shall be no delay without reason. If urgent printed matter is needed, we can promise to deliver the goods in a shorter time without increasing the express charge.
4. We strictly abide by our promise during the supply period of the agreement, according to the tender price
Model printing quality assurance 3
Please read the following carefully and return it to us after signing and dating the attached table as proof of your acceptance of these requirements. If you have any questions, please contact Qingdao Xinyuan environmental protection equipment as soon as possible.
I. Technical requirements
1. The technical drawings, technical standards and other technical materials jointly confirmed by both parties (see attached table) are the technical quality basis for Party B to organize the mass production of spare parts and supply Party A’s products, as well as the basis for Party A to accept the product quality provided by Party B.
2. Party A shall promptly notify Party B of the technical changes. If the above changes affect the tooling used by Party B, the two parties shall reach an agreement on the technical change process through consultation. If Party A decides to implement the technical change, Party B shall manufacture the ordered products in accordance with the changed technical requirements.
3. Party B shall consciously implement the technical data in the schedule confirmed by both parties. If the technical data in the schedule are not fully implemented, Party B shall bear all responsibility and losses. If it is really necessary to change the relevant documents, Party A shall obtain the consent of Party A. and change the relevant documents in the schedule in a timely manner.
II. Quality requirements
1. ISO/TS 16949, QS-9000 or ISO9001- quality system requirements
All suppliers of Zhengyu Company must be certified according to one of the above standards and have current valid certificates, indicating that they have complied with Zhengyu’s requirements. The supplier must ensure the suitability and continuous effectiveness of the system. In the case of passing the evaluation by the third-party certification body, Qingdao Xinyuan environmental protection equipment does not rule out on-site and data evaluation of the supplier’s quality system and production process capabilities and products, and the supplier must ensure that it can meet the evaluation requirements of Zhengyu Company.
Suppliers not certified according to ISO/TS 16949, QS-9000 or ISO9001 must submit a detailed certification plan and schedule for further consideration when signing an order contract with Zhengyu. In the case that it has not obtained the certification qualification, Zhengyu company does not rule out the unilateral termination of the supply contract for the suppliers who have already supplied the goods.
For suppliers that have not obtained any of the above certification qualifications or have been assessed by Zhengyu Company as unqualified, Zhengyu Company will evaluate its supply performance three months before delivery, and suppliers must cooperate with Zhengyu Company’s evaluation activities.
2. All suppliers must guarantee to provide qualified products to Zhengyu Company, and confirm in writing that the performance indicators of the products meet the requirements of the country, industry and Zhengyu Company at the time of delivery, because the product quality characteristics are not in conformity with the requirements of Zhengyu Company.
The supplier shall bear the financial responsibility for the control measures such as correction, prevention and improvement of the supplier and Zhengyu Company.
When delivering each batch, the supplier must certify in writing that all tests and analyses have been completed and confirm that the performance indicators of the products meet the requirements, and provide Zhengyu with detailed inspection and test reports and data.
In the case of urgent shipment of the products found that do not meet the requirements of previously submitted samples and related documents, if the unqualified products do not affect the performance, function, installation and other key features of the products, you can apply to the quality Department of Qingdao Xinyuan Environmental Protection equipment Co., Ltd. the goods can be delivered only after receiving the approval of Qingdao Xinyuan Environmental Protection equipment Company and the designated logo should be affixed on the goods.
When the product is delivered for the first time, the supplier must also provide an analysis report of all materials for the part in addition to the information required in Article 1, and confirm that the materials used do not contain ingredients that affect personal safety, the environment, government laws and regulations, etc.
Suppliers must strive to continuously improve product quality and provide evidence to Zhengyu to prove the continuous improvement of product quality. for suppliers with declining supply performance, Zhengyu does not rule out measures to disqualify its suppliers and rescind the order contract.
3. In the event of any of the following circumstances, the supplier must apply in writing to the quality Department of Zhengyu Company, indicating in detail the reason for the change, the content of the change, the expected effect of the change, etc., the supplier shall not start mass production until the engineering changes and related materials have been approved by the relevant departments of Qingdao Xinyuan Environmental Protection equipment Company. The changes include (engineering changes proposed by Zhengyu or by suppliers)
Changes to the product due to changes in the design data of the product
Material change
Some or new changes have been made to the tooling tools (including tool accessories).
Excessive repair of existing equipment and tooling
The processing flow, process and method have been changed.
Production of tooling and equipment relocated to different places and changes in production environment
Change of subcontractor or material source of parts and components
The tooling and equipment that have been out of use for more than 12 months are put back into production.
After major quality matters have occurred, suppliers are required to take corrective and preventive actions.
4. Supplier responsibilities
All suppliers must ensure that they have the manufacturing capability (Ppk/Cpk) in the order contract and provide evidence of their process capability.
Suppliers must have clear records of corrective and preventive actions for any internal failure anomalies and corrective and improvement projects proposed by Zhengyu Company, and keep relevant records and data properly and completely. For the corrective and preventive measures put forward by Zhengyu Company, the supplier must reply to the effective corrective and preventive actions within seven working days, and have a clear implementation schedule and responsible person for these measures.
All suppliers must have effective control methods and procedures in the manufacturing process to ensure that product quality is effectively controlled and continuously improved.
The supplier must have a sound corrective and preventive action system for any abnormal failure to ensure the continuous supply of qualified products to Zhengyu.
All suppliers must ensure that the quality and characteristics of their supplies meet the requirements of the country, industry and Zhengyu, and provide product material analysis reports in the event of first delivery or material changes. Suppliers of raw materials and auxiliary materials (such as steel pipes, paints, rubber, etc.) must ensure that the materials used do not affect personal safety, environment, laws and regulations, etc.
The supplier must have relevant testing and analytical instruments and ensure the applicability and effectiveness of the testing instruments, if not, an external certified laboratory must undertake its inspection and testing work and provide Zhengyu Company with any product-related inspection and test records and data.
5. Other requirements
Suppliers must do the following:
Before shipping to customers, ensure that complete and effective preventive measures and error prevention techniques have been established to ensure that measures can be taken to correct defects before they occur, and that defective products will not be shipped to Zhengyu.
Summarize any past failure anomalies and customer requirements for corrective and preventive actions to continuously improve the system.
Promote the use of simple and inexpensive devices in the process to help prevent and detect errors
Ensure that all production processes, including outsourcing processes, have effective control measures to prevent anomalies if the process, material or manufacturing location has changed, modify all factors that may affect the quality of the product and submit a written report and samples to Zhengyu
III. Product packaging and product identification
Party B’s product packaging must ensure the quality and convenient storage of the products in the process of storage and transportation, and implement the packaging standards agreed by both parties. If the packing standard cannot be implemented under special circumstances, Party A must obtain the consent of Party An in advance, otherwise Party A has the right to reject it or make other forms of treatment.
IV. Provisions of the agreement
1. This agreement shall enter into force as soon as it is approved and signed by both parties, and the term of the agreement is one year. In view of the long-term and stability of the cooperation between Party An and Party B, this Agreement will be automatically extended if either party does not request to terminate this Agreement within three months of the expiration of this Agreement.
2 this agreement is in duplicate, one for each party.
Supplier name:
Supplier manufacturing location:
Supply product name and model:
I have read and understood the information contained in this document, and I am signing it on behalf of the senior management of the company.
Auditor:
Date: printed signature
Job title: telephone number:
Supplier’s official seal:
Tianjin Carton Factory?
As a big country of box printing, corrugated box packaging equipment made in China has a market share of about 90% in China, about 28% in Asia, and only 8% outside Asia. This shows that the share of domestic corrugated box packaging equipment in the world is still quite low, and its market development space is quite broad. For domestic corrugated box equipment suppliers, the top priority is to actively explore overseas emerging markets and achieve export market diversification. If we want to occupy the international market, we should broaden the export channels. But on the other hand, it is urgent for us to face up to the main problems existing in China’s packaging and printing industry at present. Because of the large energy consumption of equipment, excessive solvents and gases emitted, and large electricity consumption, most domestic packaging enterprises are often called big electricity users compared with other industries.
For the development of China’s packaging and printing industry experts suggest: first, reduce costs, maintain price advantage; second, improve product quality, increase scientific and technological content; third, improve after-sales service and actively look for reliable local agents. As long as China’s corrugated box packaging equipment suppliers can maintain the price advantage, optimize the product structure, speed up industrial upgrading and enhance the added value, it will enhance its export competitiveness.
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