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:
Custom Size Printed Coffee Milk Juice Wine Bib Bag-In-Box With Valve Gift Cardboard Box
mulberry mini pouch with handle custom
What are the differences between polyester pet vacuum bag and nylon pa vacuum bag
Popular recommendation
China Factory Baby Complementary Food Spout Pouch Baby Food Fruit Puree Bag With Spout Packaging Bag
Eco Friendly Plastic Mylar Pouch Stand Up 50ml 100ml 200ml 250ml Custom Aluminum Spout Pouch
Custom Special Shaped Super Pouch Aluminum Foil 1.5L 3L 5L Stand Up Drink Juice Liquid Pouch With Va
tea pouch packing machine price
flexible packaging houston sales
flat bottom coffee bag price
super pouch tool bag custom
juice bag in box price
bag in box packaging wholesale
spout pouch bag price
The thickness of the food packaging bag is related to food safety.reusable Snack food bag Manufactur
The common problems of self -standing bags are here, the solutions are here
Introduce you how to use Zipper Vacuum Sealer Bag.zipper vacuum sealer bag
How to distinguish the quality of OPP card head plastic bag?
The origin of aluminum foil bags!disposable aluminum foil bag
coffee bag with one way valve distributors.The thickness of each layer of the composite packaging ba
The use of aluminum foil bags
kraft paper pouch with zip lock.Analyze the safety issues of food packaging bags
Sterile packaging bag.aluminum foil bag large custom
What is a coffee bag
Packing bag material what classification
Can I use a vacuum bag to keep food safe?
Production method of degradable plastic bag
What are the requirements for the performance of sterile packaging bags?
Tell you the factors that affect the food packaging bag.petco free dog food bag
Characteristics of various food packaging materials
Why are degradable plastic bags standing on the cusp of wind and waves
How biodegradable plastic bags can be degraded
The purpose of a composite packaging bag.aluminum laminated foil bag Factory
Features of vacuum packaging bags.Biodegradable Bubble mailing bag manufacturer