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:
Custom Portable Reusable Drink Bags Stand Up Plastic Spout Pouches For Beverages Liquid Packaging
biodegradable spout pouches custom
Flexible packaging film roll direct sales
Method of using electrostatic adsorption for thermal shrinkage of plastic packaging.Vacuum zipper ba
Popular recommendation
PET food bag
Kraft paper pouch
125g 250g 500g 1kg Aluminum Foil Flat Bottom Coffee Bean Bags With Valve
coffee pouch price
aluminium spout pouch distributors
stand up spout pouch custom
super pouch Factory
new super pouch distributors
spout pouch bag supplier
kraft paper spout pouch Factory
Differences in the Materials of Composite Packaging Bags
Customized milk tea packaging bag manufacturers
What are the main uses of bag-in-box?
Guide the use of plastic packaging bags
baby pacifier newborn wholesale.What are the good properties of food packaging bags
Classification of liquid bags
Why are stand up pouch bags widely used?
Ziplock bag manufacturers wholesale
Experience in the era of Bag-in-Box
Wine box packaging customization process and specific production process
Discussion on the reasons affecting the quality of water packaging bags.heat seal liquid packaging
Function of plastic food packaging bags
What kind of film is automatic packaging roll film
Process characteristics of bag in box.juice bag in box
Market size of self-supporting bag industry.custom standing pouch
The key to solve plastic pollution is degradable plastic bag
Packaging Bag Classification
What are the characteristics of the bag in the box..bag in box wine
Analysis of the prospect of the new tea industry, in addition to taste, packaging is also the focus
The characteristics and application of composite packaging bag