Tel: +86 188 2689 9458
source:other news release time:2023-06-20 Hits:
1、 The adhesive itself is too dark in color, with deep yellow, yellow red, and sometimes even a dark red color like soy sauce soup remaining on the adhesive film. Therefore, in situations where high transparency is required, slightly yellow or even colorless high transparency adhesives should be selected.
2、 The transparency issue of the substrate. The transparency of Vacuum packing bags will be seriously affected when there are "shark skin", "runner mark", crystal point and other apparent quality problems on the surface of the inner substrate. The mist like ink stains transferred to non graphic parts during printing also significantly affect the transparency of the composite film.
3、 There are issues with the adhesive. Improper mixing procedures will result in insufficient mixing of the main agent and curing agent. Possible occurrence of "colloidal particles" phenomenon.
4、 The Vacuum packing bag has obvious appearance defects such as glue spots.
5、 Improper setting of oven temperature. At the beginning, when entering the drying channel, the temperature is too high and the drying is too fast, which causes the solvent on the surface of the adhesive layer to evaporate rapidly, causing a local increase in the concentration of the adhesive layer on the surface. As the heat penetrates into the interior of the adhesive layer, the solvent under the film vaporizes and breaks through the adhesive film, forming a circular structure like a volcanic vent. Circle by circle, it also makes the adhesive layer uneven, Also known as "orange peel like" (when viewed closely with the naked eye, it feels like the appearance of a composite film product is uneven like an orange peel, hence the name "orange peel like"), causing opacity. Therefore, the temperature of the drying channel should gradually increase from the inlet to the outlet, from low to high, with a gradient that allows the solvent to continuously evaporate from the inside to the outside in an orderly manner. In addition, when the amount of adhesive applied is too large, the adhesive layer is relatively prone to the above-mentioned defects during the drying process.
Read recommendations:
Wholesale High Barrier Plastic Stand Up Flat Bottom Pet Dog Food Packaging Bag
printed snack food bags Production
The Revolution in Liquid Packaging
flexible packaging film roll pouches custom.How can we find a good supplier for packaging bags with
Popular recommendation
Flexible packaging film roll
BIB Bag-in-box dispenser with butterfly valve vitop for drinking water wine juice
Custom Portable Reusable Drink Bags Stand Up Plastic Spout Pouches For Beverages Liquid Packaging
sideguesst bag for coffee bag
smart spout pouch sales
eco friendly spout pouches custom
zip lock bag for coffee sales
recyclable spout pouches
Spout pouch flexibility sales
pet food bag making price
With Spout pouch - a new form of packaging
What is the function of the hole on the coffee bag
Pet Food Bag: The Ultimate Guide
With the widespread use of bags in boxes, their quality has been continuously recognized.bag in box
Creative design of coffee bag
What equipment is needed to produce plastic packaging bags
Features and uses of textured vacuum bag
Guide the use of plastic packaging bags
Different products have different standard requirements for composite packaging.stand up coffee pouc
How to distinguish the quality of OPP card head plastic bag?
Low carbon composite aluminum foil bag raw materials have become the main theme
The preservation characteristics of vacuum frying food
Plastic bags can be degraded and environmentally friendly
Basic elements of packaging bags.bag in box sales
Meaning of barcode number of food packaging bag.
What are the benefits of vacuum food packaging bags
How to Choose Vacuum Packaging Bag for Frozen Food
How to remove the static electricity of the packaging bag?
What kind of bacteria is flatulence in food packaging bags generally?mylar bags custom printed
Packaging products in aluminum foil bags gives you great face