Tel: +86 188 2689 9458
source:other news release time:2023-06-16 Hits:
1、 Improper selection of adhesive:
(1) The adhesive itself has a deep color;
(2) The adhesive has insufficient fluidity and poor flattening ability, and cannot be fully spread on the substrate.
Generally speaking, the higher the solid content of the main agent, the better the fluidity, which is conducive to spreading on the film. Therefore, currently, 75% adhesive has better transparency than 50% adhesive in the market, with 50% better than 40%. For composite films with high transparency requirements, both 50% and 40% adhesive are difficult to meet.
2、 Process issues:
(1) The temperature at the entrance of the drying channel is too high or there is no temperature gradient, and the temperature at the entrance is too high and the drying is too fast, causing the solvent on the surface of the adhesive layer to evaporate quickly and form a crust. Then, when the heat penetrates into the interior of the adhesive layer, the solvent under the film vaporizes and breaks through the adhesive film to form a ring like a volcanic vent, which makes the adhesive layer opaque.
(2) There is a defect in the composite rubber roller or scraper, which cannot be pressed at a certain point, forming a gap and opaque.
(3) There is too much dust in the ambient air, and there is dust in the hot air blown into the drying duct after gluing. Sticking to the surface of the adhesive layer, sandwiched between two base films during lamination, there are many small spots that cause opacity. Solution: The air inlet can be cleaned with a high mesh filter screen to eliminate dust in the hot air.
(4) Insufficient amount of glue applied. If there is a blank area, there may be small air bubbles, which may cause a pattern or opacity. Please check the amount of glue applied to ensure it is sufficient and even.
(5) No spreading roller or unclean spreading roller.
3、 Reason for substrate:
The surface tension is not high, and the wetting ability of the adhesive is not enough. After drying, the adhesive film becomes uneven, bit by bit, commonly known as the "pockmarked face film".
Read recommendations:
3L 5L Bag-In-Box Wine Dispenser Coffee/ Juice/ Water/ Oil Bag-In-Box With Valve
Popular recommendation
125g 250g 500g 1kg Aluminum Foil Flat Bottom Coffee Bean Bags With Valve
Custom Laminated Printing Juice Bag Liquid Packaging Stand Up Plastic Water Spout Pouch
Laminated Aluminum Foil Zip Lock Bag Stand Up Pouch /Matt White Foil Pouch /Zip Lock Coffee Bag
refillable spout pouches supplier
Pouch with handle wholesale
aluminium spout pouch maker
Spout pouch manufacturer
bag in box packaging wholesale
spout pouch wholesale
smart spout pouch distributors
Test standards for frozen food packaging.petco free dog food bag Manufacturing
How to use the air hole on the coffee bag
What are the common bag types of food packaging bags
Several common coffee bag materials
Bag-In-Box: The Future of Flexible Packaging and Its Impact on Top-line Growth
Human care in food packaging
The vacuum packaging bag could not be sealed because of this
The printing principle of composite bags.eco friendly spout pouches custom
The production process of sterile bags
Type of bag
Introduction to Testing Methods for Food Packaging Bags.best food packaging
Folding and winding film of packaging bag
The food vacuum bag takes advantage of each other and the two materials are compounded together
The manufacturer tells you the precautions for using composite food vacuum bags.food packaging produ
smart food snack bags supplier.What is the reason for cutting rounded corners in snack food packagin
Biodegradable Bubble mailing bag wholesaler.What should be done if the composite packaging bag has a
Composition of degradable plastic bag
Toothpaste packaging bag
Production process of sterile bags
What are the requirements for making food packaging bags in general.petco free dog food bag wholesal