According to some manufacturers, there are a variety of reasons for the foaming phenomenon, such as the bottle surface is not clean, flat.The bottle body should be washed and dried first, and it should be clamped and fixed by conveyor belt when labeling according to the surface shape of the bottle, especially the flat plastic bottle.
It is also a reason to choose the film material with appropriate properties without considering the material of bottle body. Soft bottle bodies should be made of PE, PVC, unstretched PP and synthetic materials of PE and PP.Hard bottle body should choose PET, BOPP, PS and other materials.
If the speed of the labeling machine adjustment, labeling method is not appropriate will also cause blisters.Specifically, the bottle should run slightly faster than the label to avoid bubbles.
Before labeling to completely eliminate static, so that the label firm out of the label, from the bottom of the paper.Labeling machine should not use brush, sponge roller, vacuum adsorption method labeling, should be installed with a certain strength of rubber scraper contact with the label, and make the scraper maintain a certain Angle and force.The labeling of soft bottle body should adjust the relationship between labeling speed, scraping force, Angle and distance.
In addition, if the backing paper is not selected properly, it will appear blistering phenomenon.Manufacturers suggest that users should choose a smooth bottom paper, such as PE material bottom paper, it will make the adhesive in its surface flat, after labeling good wettability, flat.
Impurities on the bottle, plasticizer, chemical reaction of glue, activation of solvent on the printing surface and other factors will bubble in the labeling process.Therefore, the user needs to clean the bottle.