How to distinguish between good and bad self-adhesive label printing materials

How to distinguish between good and bad self-adhesive label printing materials

Self-adhesive label materials are widely used in the printing industry, and the methods of use are becoming more and more mature. The quality of self-adhesive materials is also improving. Of course, there are also some inferior counterfeit products. The material structure is composed of three parts on the surface, namely surface material, adhesive and backing paper, but from the perspective of manufacturing process and quality assurance, the self-adhesive material consists of seven parts:

1. Surface material: that is, the surface material, which is a material that accepts printed graphics on the front and adhesives on the back and is finally applied to the object to be pasted. Generally speaking, any flexible and deformable material can be used as the fabric of the self-adhesive material, and the type of surface material depends on the final application and printing process. The surface material must be able to adapt to printing and printing, have good ink adhesion, and be strong enough to accept various processing. The surface gloss and color consistency of the surface material, and the uniformity of density reach some indicators that determine the absorption of self-adhesive materials. The uniformity of the ink also determines the color difference of the same batch of label prints.

2. Surface coating: used to change the surface characteristics of the surface material. Such as improving the surface tension, changing the color, increasing the protective layer, etc., to make it better to accept the ink and easy to print, to prevent dirt, increase the ink adhesion and prevent the printed graphics from falling off. Surface coating is mainly used for non-absorbent materials such as aluminum foil, aluminized paper and various film materials. The coating strength of the surface material determines whether a large amount of paper powder will be produced during printing, and it is also an important indicator for determining the printing quality.

3. Coating the bottom layer: It is the same as the surface coating, but it is coated on the back of the surface material. The main purpose of coating the bottom layer is: (1) Protect the surface material and prevent the penetration of the adhesive. (2) Increase the opacity of the fabric; (3) Increase the bonding force between the adhesive and the surface material; (4) Prevent the plasticizer in the plastic surface material from penetrating into the adhesive, affecting its adhesion agent performance, resulting in reduced label adhesion and label peeling.

4. Release coating (silicon coating): that is, coating a silicone oil layer on the surface of the backing paper. Applying silicone oil can make the backing paper a very smooth surface with very low surface tension, which is to prevent the adhesive from sticking to the bottom. on paper.

5. Adhesive: Adhesive is the medium between the label material and the bonding substrate, which acts as a link. According to its characteristics, it can be divided into two types: permanent and removable. It comes in a variety of formulas for different face materials and different occasions. Adhesive is the most important component in self-adhesive material technology and is the key to label application technology.

6. Bottom paper: The function of the bottom paper is to accept the coating of the release agent, protect the adhesive on the back of the face material, and support the face material, so that it can be die-cut, waste disposal and labeling on the labeling machine. Like the facestock, the uniformity and strength indication of the bottom paper thickness are not only related to printing performance, but are also important indicators of die-cutting uniformity and waste discharge speed and edge breakage.

7. Back coating or back printing: Back coating is a protective coating on the back of the backing paper to prevent waste discharge, and the adhesive around the label after rewinding is bonded to the backing paper. The uniformity of adhesive and silicone oil coating and the correct coating amount directly affect the peeling force (release force) between the label and the backing paper, and the size of the peeling force directly affects the die-cutting waste and the speed of the machine. The peel force also determines the label's out-of-label condition, that is, the application condition. In addition, the amount of glue applied will also affect the glue penetration of the end face of the material.

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