Common quality problems and solutions of vacuum packaging bags
1. The thickness of the substrate is uneven, and the film is too different.
2. Unwinding of the substrate.
3. When the amount of glue applied is too large or insufficient, sliding between layers will occur; uneven application of glue will also cause the appearance of local wrinkles.
4. Insufficient drying of the adhesive, too much residual solvent, small adhesion, displacement of the two substrates after compounding.
5. The composite film is directly wound without cooling or cooling, and the high temperature and soft composite film is easy to wrinkle.
6. Improper setting of tension compound pressure.
7. Improper tension control, uncoordinated and unmatched tension for unwinding and winding.
8. The guide rollers are not parallel.
9. The surface of each guide roller is not clean, sticking foreign objects, or the surface of the guide roller is uneven, with pits, scratches, bruises, etc.
1. Replace the qualified film.
2. The position of the thin film is adjusted so that it does not deflect during transmission.
3. Adjust the amount of glue and apply glue evenly.
4. Adjust the process parameters so that the adhesive can be fully dried and reduce the residual amount of solvent.
5. The composite film should be fully cooled before rewinding.
6. Adjust the compound pressure.
7 Adjust the unwinding and rewinding tension to make the tension of each part match each other.
8. Adjust the parallelism of each guide roller.
9. Clean the surface of each guide bar and replace the damaged guide bar to ensure that the surface of the guide roller is smooth, smooth and clean.
1. During the printing process, the drying speed of the ink is not suitable for the printing speed, so that part of the solvent still remains in the ink layer after printing, so that the ink layer is softened, so that the composite film is also sticky.
2. The adhesive does not dry completely, and the residual solvent gradually penetrates into the ink layer, making the ink layer soft and sticky.
3. The plasticizer in the plastic film migrates to the ink layer, so that the film softens and becomes sticky
1. Adjust the drying speed of the ink according to the actual situation, and make it fully dry
2. Adjust the process parameters to ensure that the adhesive can be fully dried, so that the amount of residual solvent is controlled within the minimum limit.
3. Replace the plastic film
The packaging bag has "small dots"1. There are impurities in the adhesive. There is too much dust in the air in the workshop environment. There is also dust in the hot air blown out of the drying tunnel after gluing. The dust sticks to the glue layer and is sandwiched between the two base films during compounding.
2. The solvent of the two-component reactive adhesive is susceptible to whitening and turbidity due to the influence of temperature, resulting in an increase in "small pockmarks"
many.
1. Filter the adhesive; keep the environment clean; keep the rubber barrel and glue tray clean; use a high-mesh filter screen or other filter materials to remove the dust in the hot air at the air inlet of the drying tunnel.
2. The "turbid white" gumming agent can no longer be used.
Poor peel strength of aluminized packaging bags1. The adhesion of the aluminum layer of the aluminized film is poor, and it is easy to fall off.
2. The surface tension of the aluminum coating is too low.
3. Improper type of adhesive.
4. The adhesive is not sufficiently dry, and the residual ethyl acetate penetrates into the ink layer to soften, loosen or even delaminate the printing ink.
5. Insufficient amount of glue.
6. The purity of the diluent ethyl ester is not high, and the content of active substances such as water or alcohol is relatively high. A part of the curing agent is consumed, resulting in an improper actual ratio of the main agent to the curing agent in the adhesive.
7. The temperature of the surface of the composite steel roller is low, or the composite pressure is too small
8. Incomplete curing of the composite film.
1. Replace high-quality aluminized film.
2. Corona treatment or replacement of aluminized film.
3. Use special adhesive for aluminum film.
4. Adjust the compound process to increase the drying temperature of the drying tunnel, or appropriately reduce the compound line speed to ensure that the rubber boots can be fully dried.
5. Properly increase the amount of glue applied.
6. Replace qualified diluent and strengthen the detection of diluent.
7. Appropriately increase the surface temperature of the composite film roll, or increase the composite pressure.
8. Properly increase the curing temperature to ensure that the composite film can be fully cured.
Spots appear on aluminized packaging bags1. Improper selection of adhesive. Ordinary adhesive has poor affinity to the aluminized layer and poor coating performance. If the coating is uneven, spots will appear.
2. There are many residual solvents in the glue solution. After the printing film is compounded, the ink layer is soaked by the residual solvents in the glue solution to produce spots.
3. Insufficient coverage of ink. Especially for light-colored ink, light passes through the ink layer and is reflected back by the aluminum layer to produce spots.
4. Insufficient amount of glue or uneven glue application, there are bubbles in the composite film.
1. Use special adhesive for aluminum film.
2. Properly increase the drying temperature of the drying tunnel, or appropriately reduce the composite linear speed. Ensure that the adhesive can be fully dried.
3. Choose the ink with strong hiding power or thicken the ink layer.
4. Properly increase the amount of glue applied, and check the state of the rubber pressure roller to ensure even glue application.
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