In daily life, packaging bags can be seen everywhere, a variety of food packaging bags, electronic packaging, aluminum foil packaging bags are various. A good packaging bag is also tempered. What problems will be encountered in the process of making bags? What should be done?

Wrinkled bags
1. The thickness of the substrate is not uniform, and the film difference is too large.
2. The unwinding deviation of base material.
3. If the amount of glue is too much or not enough, it will slide between layers; uneven coating will also cause local wrinkles.
4. The adhesive drying is not enough, the residual solvent is too much, the adhesion force is small, and the two kinds of substrate after composite have displacement.
5. The composite film is rolled up directly without cooling or insufficient cooling, and the high temperature and soft composite film is easy to wrinkle.
6. Improper setting of composite tension.
7. Improper tension control, uncoordinated and mismatched tension of unwinding and winding.
8. The guide rollers are not parallel.
9. The surface of each guide roller is not clean, there are foreign matters, or the surface of guide roller is not smooth, with pits, scratches, bruises, etc.
terms of settlement
1. Replace the qualified film.
2. The position of the film should be adjusted so that it does not deflect in the transmission process.
3. Adjust the amount of glue and apply glue evenly.
4. Adjust the process parameters to make the adhesive fully dry and reduce the residual amount of solvent.
5. The composite film should be cooled sufficiently before rewinding.
6. Adjust the compound pressure.
7 adjust the unwinding and winding tension to make the tension of each part match with each other.
8. Adjust the parallelism of each guide roller.
9. Clean the surface of each guide rod and replace the damaged guide rod to ensure that the surface of guide roller is flat, smooth and clean.
Sticky bags
1. In the printing process, the drying speed of the ink does not adapt to the printing speed, so that some solvents still remain in the ink layer after printing, which softens the ink layer and makes the composite film sticky.
2. Adhesive drying is not complete, residual solvent gradually penetrated into the ink layer, so that the ink layer softening sticky.
3. The plasticizer in the plastic film migrates to the ink layer, which makes the film soften and sticky.
terms of settlement
1. According to the actual situation, adjust the drying speed of the ink 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.
3. Replace plastic film
There are "small pockmarks" in the packaging bag
1. There are impurities in the adhesive. There is too much dust in the air of the workshop environment. There is also dust in the hot air blowing out from the drying channel after gluing. The dust sticks to the surface of the adhesive layer and is sandwiched between the two base films when compounding.
2. The solvent of two-component reactive adhesive is easily affected by temperature and turns white and turbid, resulting in the increase of "small pits"
More.
terms of settlement
1. Filter adhesive; keep the environment clean; keep rubber barrel and glue plate clean; use high mesh filter screen or other filtering materials to remove dust in hot air at the air inlet of drying channel.
2. The "Turbid white" glue can not be reused.
The peeling strength of aluminized packaging bag is poor
1. The adhesion of aluminum coating is poor and easy to fall off.
2. The surface tension of aluminized film is too low.
3. Improper type of adhesive.
4. The adhesive drying is not enough, the Residual Ethyl Acetate permeates into the ink layer, making the printing ink soften, loose, and even delamination
5. The amount of glue is insufficient.
6. In addition, the high content of curing agent, such as ethyl alcohol, is not suitable for curing agent.
7. The surface temperature of composite steel roller is too low, or the composite pressure is too small
8. The curing of the composite film was not complete.
terms of settlement
1. Replace high quality aluminum plating film.
2. Corona treatment or replacement of aluminized film.
3. Special adhesive for aluminizing film is selected.
4. Adjust the composite process, increase the drying temperature of the drying channel, or appropriately reduce the compound linear speed to ensure that the rubber boot agent can be fully dried.
5. Properly increase the amount of glue.
6. Replace qualified diluent and strengthen the detection of diluent.
7. Properly increase the surface temperature of the composite film roller or increase the composite pressure.
8. Increase the curing temperature properly to ensure that the composite film can be fully cured.
Spots on aluminized bags
1. Improper selection of adhesives, ordinary adhesives for aluminum coating affinity is poor, coating performance is poor, if the coating is not uniform, there will be spots.
2. There are many residual solvents in the glue solution. After the printing film is compounded, the ink layer is soaked by the residual solvent in the glue solution, which can produce spot phenomenon. 3. Ink coverage is insufficient. Especially for light color ink, light through the ink layer and is reflected back by the aluminum layer to produce spots.
4. The amount of glue is insufficient or uneven, and there are bubbles in the composite film
terms of settlement
1. Special adhesive for aluminizing film is selected.
2. Properly increase the drying temperature of the drying channel, or reduce the composite linear speed to ensure that the adhesive can be fully dried.
3. From the selection of strong covering ink or thickened ink layer.
4. Properly increase the amount of adhesive coating, and check the state of the rubber roller to ensure that the coating is uniform.
Dongguan Beite packaging materials Co., Ltd. is a large-scale company specializing in the production of food grade composite packaging. It is a professional manufacturer of composite packaging bags. It uses new equipment to produce packaging bags and roll films, providing comprehensive, environmental protection and safety packaging services for the market. The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries. We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.