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 Print Side Gusset Coffee Pouch Black Matte Coffee Beans Packaging With Valve
eco friendly spout pouches price
The origin of aluminum foil bags!disposable aluminum foil bag
How to judge the quality of liquid packaging bags?produce trays and packaging
Popular recommendation
125g 250g 500g 1kg Aluminum Foil Flat Bottom Coffee Bean Bags With Valve
BIB Bag-in-box dispenser with butterfly valve vitop for drinking water wine juice
China Factory Baby Complementary Food Spout Pouch Baby Food Fruit Puree Bag With Spout Packaging Bag
spout pouches Solution
Spout pouch flexibility
smart spout pouch manufacturer
stand up coffee bag
wine bag in box price
Spout pouch flexibility Factory
tea pouch packing machine company
Introduction to Barcodes for Packaging Bags
Do you know these characteristics of the bag in the box?
Can the use of vacuum bags ensure that the food does not get moldy?
Experience in the era of Bag-in-Box
sideguesst bag for coffee bag distributors.The number of packaging layers of moon cakes and Zongzi s
What is the difference between vacuum bag and aluminum foil bag
Introduction to liquid packaging methods
How much do you know about PE bag blowing film?properties of flexible packaging films distributors
Why are cylindrical bag-in-box so popular?
The source factory of packaging bags takes you to understand the three side sealing bags and the mid
Packaging.aluminum foil bag large Production
The thickness control of vacuum packaging bag is very important
The preservation characteristics of vacuum frying food
Reasons for Aging of Food Packaging Bags and Preservation Techniques
Development history of biodegradable plastic bags
Explanation on Flexible Packaging.bags in a box
How to increase the sales of plastic bags.stand up pouches for food package
PE plastic bag introduction
Do you need to pay attention to the shelf life of food packaging bags?petco free dog food bag distri
Vacuum packing bag