Many products need transparent labels, especially those containing transparent or coloured liquid product packaging, such products are generally used in transparent bottles, paste transparent labels can increase the visual effect of goods.

Transparent bottle material is generally hard glass, or can be extruded plastic. Paste transparent labels on such products are prone to bubbles, we can avoid labelling bubbles from the following aspects:

1, the surface of the bottle is clean, flat: before labelling must be clean labelled products; if the bottle is a regular curved surface or spherical bottle, in the labelling by the conveyor belt clamping fixed, especially flat plastic bottles;

2, according to the bottle material selection of suitable characteristics of the film material: soft bottle should choose such as PE, PVC, unstretched PP and PE and PP synthetic materials; hard bottle should choose PET, BOPP, PS fabric;

3, pay attention to adjusting the speed of the labelling machine, labelling method: labelling the bottle should run slightly faster than the label out of the label speed, so as to avoid the production of air bubbles. Labelling of soft bottles to adjust the labeling speed, scraper strength, angle, distance between;

4, labelling before the complete elimination of static electricity, so that the label firm out of the label, out of the backing paper.

5, the labelling machine should not be used on the brush, sponge roller, vacuum adsorption method of labelling, should be installed with a certain strength of the rubber scraper with the label contact, and make the scraper to maintain a certain angle and strength.

6, choose the right backing paper: should choose a good smoothness of the backing paper, such as PET material backing paper, so that the adhesive on its surface flatness, good wetting after labelling, flat;