Compared with traditional labels, self-adhesive labels have the advantages of no need to brush glue, no paste, no need to dip in water, no pollution, saving labeling time, etc. They have a wide range of applications, are convenient and fast. Self-adhesive is a kind of material, also called self-adhesive label material. It is a composite material with paper, film or other special materials as the fabric, adhesive on the back, and silicon-coated protective paper as the base paper. And after printing, die-cutting and other processing, it becomes a finished label.

Self-adhesive labels are mainly divided into two categories:

Paper base material
Offset paper, coated paper, glass cardboard, laser paper, kraft paper, fluorescent paper, gold-plated paper, aluminum foil paper, fragile (anti-counterfeiting) paper, silver-plated paper, textured paper, cloth label (Tyvik/nylon) paper, Pearlescent paper, sandwich coated paper, variable information paper.

Film substrate
Transparent polyvinyl chloride (PVC), polyester (PET), polypropylene (PP), polycarbonate (PC), synthetic paper, PS, PE, shape memory anti-counterfeiting material (SMP), etc.

Printing method
Embossed
Self-adhesive labels are printed using letterpress printing. The printing plate is a photosensitive resin letterpress plate. The printed labels have the advantage of full ink color. However, the grades of letterpress printing equipment vary greatly. Some are still using circular flattening letterpress printing machines, and some are using ordinary letterpress printing machines. Some rotary letterpress machines have adopted professional inclined-back, satellite or unit-type self-adhesive label printing machines, so they cannot be generalized during the transformation.

Offset printing
Offset printing is the main way for Chinese label printing factories to print paper self-adhesives. Offset printing is characterized by fine graphics and rich layers, which is suitable for mass printing. The printing equipment can be used for multiple purposes, which is suitable for the characteristics of the Chinese label market. However, sheet-fed offset printing is not suitable for printing films with no absorbent surface, because film labels are mostly roll-to-roll printing and require volatile drying ink. Offset printing can print thicker plastic materials

Flexo printing
At present, the quality of flexographic printing is no less than that of offset printing, and even has its own unique features. The advantages of this printing process are simple machine structure and low cost. The printing quality is comparable to offset printing and gravure printing, and has the advantage of thicker ink layer than offset printing products. Flexo printing uses water-based ink and UV ink, which does not pollute the environment. However, due to the greater elasticity of the flexographic plate, the tone reproducibility is different from that of gravure and ordinary letterpress. The dots from highlights to mid-tones in flexographic printing are larger, the printing contrast is small, and the highlight level is prone to faults. When printing fine graphics and text, When labeling, in order to make up for the layer defects, FM dots can be used in the highlights, and AM screening can be used in the dark or middle to improve the quality.

Main application
Common ones include drug labels, food labels, wine labels, battery labels, outer box labels, shampoo labels, barcode labels, temporary labels for semi-finished products, etc.
Mainly paper and film
Mainly used for decorative decals on cars and motorcycles, logos on trademark windows, reflective films on highways, markings on containers, etc.
According to the application scope, it is divided into basic tags and variable information tags.
variable information tag
Batch number, sequence code, bar code, production date, validity period, price, mailing process information processing, distribution, warehouse management, inventory data, etc.

Features and advantages
It has the advantages of no need to brush glue, no paste, no need to dip in water, no pollution, saving labeling time, etc. It has a wide range of applications, is convenient and fast. All kinds of self-adhesive labels can be applied to materials that ordinary paper labels are not capable of. It can be said that self-adhesive labels are a universal label. Compared with the printing of traditional printed matter, self-adhesive label printing has great advantages. The difference is that self-adhesive labels are usually printed and processed on a label linkage machine, and multiple processes are completed at one time, such as graphic and text printing, die cutting, waste discharge, cutting and rewinding, etc.

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