Production process and performance analysis of the

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Production process and performance analysis of dry composite membrane (IV)

common failure examples of dry composite membrane process

troubleshooting methods for phenomena remarks

poor appearance bubbles of composite membrane

1 Poor film wetting

2 Ink surface concave next week and blistering

3 The glue coating on the ink surface is less than 1 Increase the glue concentration and coating amount

2 The pressing temperature and pressure of the composite film increased by

3 The pressing time of the same compound roll increases by

4 Use smooth roller

5 Film preheating is sufficient

6 Composite speed decreases by

7 Choose the glue with good wettability

8 Correct selection of ink MST, KPT surface is not easy to wet, easy to produce bubbles, especially in winter. For the bubbles on the ink, use the method of increasing the amount of glue to remove the additives in the film (lubricant, anti electrostatic electronic watch agent) and select the glue with high molecular weight and rapid curing to be penetrated by the glue, increase the glue concentration, increase the drying channel temperature, and fully dry the glue. Do not use the film with a storage period of more than 3 months. Because corona treatment has lost the batch number and quality of the film, the manufacturer must implement quality management. In winter, the temperature is low, and the adhesive transfers to the film and ink, The wetting and adhesion are not good. The operation site is maintained at a certain temperature. The drying temperature is too high, resulting in blistering or skin crusting of the glue. The inside is not dry. Adjust the glue drying temperature. The air is brought into the film between the compound roll to improve the temperature of the compound roll; It is easy to produce bubbles when reducing the thickness and hardness of the composite angle film. There are no bubbles after compounding, and bubbles are produced after aging

1 Due to the high barrier property of the film, the CO2 gas generated during the curing of the adhesive remains in the composite film, and there are bubbles at the unprinted part

2 Ethyl acetate in the glue is a good solvent for ink binder. The glue dissolves the ink, and there are only bubbles in the oil volume

1 Increase the curing dose, so that the adhesive solidifies in drying

2 Avoid water infiltration into the glue

3 Increase the drying temperature of glue and reduce the infiltration of ink. Pay special attention to the specific scheme of applying computer measurement and control technology to the traditional press. Do not use a liquid glue

there are irregular wrinkles and bubbles on the composite film

1 Uneven film thickness

2 The film is stretched too much, the setting is not enough, and it shrinks in case of heat

3 Due to moisture absorption, the membrane deforms

1 Avoid using uneven thickness film

2 Prevent moisture absorption and deformation of the film

3 Reduce the printing coiling tension

4 When compounding, the tension should not be too high. Films with large moisture absorption such as Pt, KPT, NY and PVA should pay attention to moisture resistance

there are regular bubbles and wrinkles on the composite film

1 The purpose on the concave roll is bad

2 The rubber roller has damage and pits

3 Dirt on the compound roller

4 There is a deviation between the substrate speed and the concave roll speed

5 Film thickness deviation

1 Check the concave roll, replace or repair

2 Check whether the rubber film pressing roller is damaged, replace or repair

3 The problems of mechanical equipment should be considered when cleaning the composite roll

there are foreign matters and bubbles in the composite film

1 Dust and rubber particles mixed in the rubber

2 There is dust on the film

3 The roller is not clean 1 Clean the glue and film, and pay attention to environmental sanitation

2 Orange peel occurs on the cleaning roller

composite film 1 Mix in fine powder at high temperature to form orange peel under heat and pressure

2 Antistatic compound, in the binder, the electrostatic agent agglomerates and orange peel occurs. 1 Without powder coating, reduce the holding temperature and coiling pressure

2 Prevent electrostatic agent from caking

poor bonding caused by poor fixation

1 Improper binder ratio

2 When the glue is in storage, it deteriorates in case of moisture

3 Glue mixed with water and alcohol

4 Softener and water in the film are equivalent to glue reaction

5 The amount of glue is too small

1 Adjust the ratio of double liquid glue

2 Pay attention to the proper storage of glue. The longest time of glue is no more than 1 year (sealed by iron cans)

3 Prevent foreign matters from entering the glue, especially water, alcohol, etc.

4 Increase the amount of glue applied

there is a strong smell of solvent, the glue is not dry, the drying temperature and air volume are increased, and there are many residual solvents

reduce the compound speed. The alliance of micro angels has helped run the glue cohesiveness

1 Use the expired double liquid glue, the glue liquid has whitened, and promote the viscosity

2 Poor film corona treatment

3 Less glue coating

4 Surface printing ink is used, and the same glue cannot be bonded together

1 Double liquid glue must be prepared with use, and the bleached glue cannot be used

2 Re corona treatment

3 Increase the glue coating amount

4 Change to composite ink and test with wetting test

the composite of Al coating is easy to fall off. During vacuum Al plating, the plastic film has no primer (natural rubber) or does not use a special aluminum coating. For vacuum aluminum plating, a precoated special film should be used to have a good evaporation fastness. When the aluminum coating is stripped off by the glue and the surface coating film is compounded, Peeling off the surface coating material at the coating layer is incompatible with polyurethane, changing the glue used or changing the surface coating film. After a period of time, the composite fastness decreases

1 The additive exudation in the film reacts with the adhesive and destroys the adhesive force of the adhesive

2 The contents of the package contain spicy, grease, spices and other ingredients, which destroy the adhesive force of the glue through the inner seal

3 The composite membrane is subject to excessive heat or high temperature cooking 1 Correctly select glue or change film to prevent additives from exuding

2 Correctly select the inner seal material and thickness to prevent the content from penetrating

3 Choose films with good temperature resistance and cooking inks and adhesives, especially PVC film

cpp's oil resistance, acid resistance and alkaline resistance ratio L to achieve a vehicle weight reduction of 20% DPE compared with 2015

the temperature resistance of polyester urethane adhesive is greater than that of polyether urethane adhesive composite film. There is tunnel phenomenon (I) (II) (III) (IV) (V) (VI)

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