| Examples of failure | phenomenon | the reason | Method of exclusion |
1. increase the concentration of mixed plastic coating amount. 2. The composite membrane pressure paste temperature and pressure increase. 3. Increase the same time pressed against the composite roll. 4. Use smooth rollers. 5. Preheat the full film. 6. recombination velocity is reduced. 7. Select the wettability good glue. 8. Use the correct ink. |
| Adverse composite film appearance | bubble |
1. poor wetting film. 2. Ink surface irregularities and bubbles. 3. The rubber coating on the surface of the ink is low. |
1. increase the concentration of mixed plastic coating amount. 2. The composite membrane pressure paste temperature and pressure increase. 3. Increase the same time pressed against the composite roll. 4. Use smooth rollers. 5. Preheat the full film. 6. recombination velocity is reduced. 7. Select the wettability good glue. 8. Use the correct ink. |
MST, KPT hard surface moist, easy to produce bubbles, especially in winter, the ink on the bubble, with the increase of the amount of gum removal methods. |
| Film additives (lubricant, antistatic agent) is gel permeation. | Selection of high molecular weight, fixed quickly gum, gum increase the depth and improve the bake temperature, sufficient to make glue dry, do not use more than film storage period of three months, since the corona treatment has been lost. | Lot of film quality, manufacturers must implement quality management. | ||
| Low winter temperatures, the adhesive on the film and the ink transfer, wet adhesion is not good. | Operating establishments to maintain a certain temperature | |||
| The drying temperature is too high, the occurrence of gum emptied or epidermal crust, inside quit. | Drying temperature adjustment gum | |||
| Film sandwiched between composite roll into the air | Composite roll temperature increase, reducing the compound angle | Film thickness, while easy to produce bubbles. | ||
| Complex after no bubbles, the bubbles generated after aging |
1. Since the film is high overcast compartment, CO2 gas generated during curing adhesive residue in the composite film, not printed out also with bubbles. 2. gum in ethyl acetate is a good solvent ink bonding, peptization seeped ink, only a bubble in the ink. |
1. improve cure dosage, so glue curing in drying. 2. Avoid water infiltration glue. 3. Improve the glue drying temperature, reduce solvent ink bleeding. |
Special attention, do not use - liquid type glue. | |
| Composite film with irregular wrinkles, bubbles |
1. The film thickness uneven. 2. The film is stretched too big, qualitative enough, in case of thermal shrinkage. 3. Due to moisture, the membrane is deformed. |
1. Check the uneven film thickness. 2. To prevent moisture deformation of the film. 3. Reduce the printing winding tension. 4. complex, tension should not be too high. |
Hygroscopic big film PT, KPT, NY, PVA, etc. should pay attention to moisture. | |
| There are rules composite film bubbles and wrinkles |
1. The purpose of the recess on the eye roll and bad. 2. The rubber roller damaged pits. 3. There are dirt composite roll. The base rate through concave eye roll quickly biased. 5. The film thickness deviation. |
1. Check the concave eye roll, replace or repair. 2. Check the rubber film damage, replace or repair. 3. Clean composite roll. |
Should consider mechanical device. | |
| Composite film bag a foreign body, a bubble |
1. dust mixed with glue, rubber particles. 2. dust adhering film. 3. The roller is not clean. |
1. Clean plastic and film, attention to sanitation. 2. Clean the rollers. |
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| Composite membrane of cellulite occur |
1. Under a high temperature roll into a fine powder, orange peel is formed under heat and pressure. 2. The anti-static compound, in the binder, antistatic agents and orange peel agglomeration occurs. |
1. without powder coating, reducing the holding temperature and coiling pressure. 2. To prevent electrostatic caking agent. |
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| Composite film composite firmness bad | Curing adhesive caused by bad bad |
1. binder ratio inappropriate. 2. Glue in custody, the case of water, the occurrence of deterioration. 3. gum mixed drink alcohol. 4. The film of softener, water-equivalent plastic reaction. 5. The coating amount is too small. |
1. Adjust the ratio of two-component glue. 2. Note the rubber safekeeping, gum no longer than 1 year (cans sealed). 3. To prevent foreign matter into gel, especially water, alcohol and the like. 4. Increase the amount of glue. |
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| There is a strong solvent odor, gum unseasoned | Increasing the drying temperature, air volume, and more residual solvent. |
Reduce the composite rate |
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| No glue adhesion |
1. Use Expired already with a good two-component adhesive, glue has been whitened, lose their stickiness. 2. The film corona treatment is not good. 3. The plastic coating is less. 4. Use the Table India ink, bonded together with glue can not. |
1. The two-component adhesive must be used with the distribution, already whitened glue can not be used. 2. Re-corona treatment. 3. Increase the amount of glue applied. 4. The use of composite ink. |
With wet test test | |
| AL plating film composite layer off easily in the plating AI | When the degree of vacuum AL, the plastic film is not the end of glue (natural rubber-based) or does not use a dedicated metallized aluminum. | The use of pre-coated aluminum vacuum of professional film deposition can be good fastness. | Glue the aluminum layer is peeled off | |
| When the surface of the coating layer film composite, and then peel off the coating level | The surface coating material with polyurethane no compatibility | Glue used to change or alter the surface coating film. | ||
| After a period of time, reducing fastness |
1. films oozing with gum additives play a role, undermining the adhesion gum. 2. The contents of the package have spicy, oil, spices and other ingredients, through the inner seal layer, destruction of adhesion gum. 3. The composite film received high heat or high-temperature cooking. |
1. The correct choice of glue or change film to prevent additive emission. 2. The correct selection of material and thickness of the inner sealing layer to prevent the contents of penetration. 3. Select the temperature resistance and temperature resistance good film cooking ink and glue. |
Especially PVC film, CPP oil resistance than LDPE strong acid polyester urethane adhesive temperature greater than polyether urethane plastic | |
| The composite film has tunneling phenomenon | After the composite film shrinkage due to produce worm-like degummed |
1. The complex machine tension control is inappropriate, tension control is too small or no tension, the composite membrane surface wrinkles, and creases into a tunnel complex. |
1. Adjust the composite film tension, so that no reasonable wrinkled. |
Tunnel tunnel phenomenon |
| Since the adhesive in the water, alcohol and other volatile components in the drying undried, after the compound wherein, collusion by the bubble, forming a tunnel | Molecular glue is too small, little cohesion, make up the composite film can not stop in the middle of water, ethanol and other volatile materials vaporize and collusion into the tunnel. | Non-plastic impurities in ethyl acetate to improve the purity of the diluent. | One-component PU glue curing humidification prevents multiple tunneling phenomenon occurs in winter | |
| As part of the tunneling phenomenon caused unglued | Since the corona treatment is not good, not good ink compatibility with plastic film longitudinal or transverse contraction caused unglued, bad and forming a tunnel complex. | Prevent the film from a bad fastness | ||
| Composite membrane curling | Under composite membrane tension-free directional curl |
1. The film is hygroscopic significant differences, after shrinking moisture. 2. The tension control is inappropriate, especially in complex, LDPE too much tension. 3. drying humidity and complex high humidity. The composite film roll is too tight. |
1. Note the hygroscopic film to prevent moisture absorption. 2. The tension control should be appropriate. 3. appropriately adjusted, anti-shrinkage. 4. Adjust appropriate. |
1. The most common in the paper-plastic composite |
| A smell composite film |
1. The remaining solution odor agent 2. The alien has a smell of solvent into the composite film |
1. The printing ink residual solvents, especially coking grade toluene. 2. Adhesive residual solvent. 3. The composite film and has made a film storage bags should be avoided organic solvent gas serious place. |
1. Do not use a larger smell of solvent ink solvents and adhesives, such as: coking grade toluene. 2. Increase the ink drying temperature, increasing the amount of dry air. 3. Increase the dry complex in the dryer temperature and air flow. 4. Do not use difficult to have a volatile solvent odor. 5. The finished product should be placed free of organic solvent odor place. |
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| Bad sealing bag | Poor seal strength |
1. The adhesive curing is not complete. 2. The sealing temperature is too low. |
1. ripening completely. 2. Improve the sealing temperature. |
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| Thermal cover delamination, curling | Uncured adhesive | The curing time is not enough, a small number of the curing agent | ||
| Poor opening | Poor inner membrane opening |
1. Too little opening agent. 2. The adhesive (modifier) too much. 3. The film surface sticky or greasy. |
1. Increase the Kaiping dosage. |
PVC outer lubricant, powder, etc. is a good opening agent, and PE, PP opening agent is oleic acid amide surfactant. |
| Composite film reel slip | Roll slip |
1. The winding tension is too small, the film surface smoothness good. 2. The composite film thickness error is too large. 3. The rubber coating unevenness. |
1. To improve the composite film winding tension. 2. Improve the winding pressure. 3. Check the thickness of the flatness of the composite membrane. 4. The uniform coating. |
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| Shoot like a roll | Irregular winding | Note that is not winding mechanical movement, no side pull controller should pay attention. |
Dry complex fault and troubleshooting