Back coating is a kind of protective coating on the back of the backing paper to prevent waste discharge. The adhesive around the rewinded label adheres to the backing paper. Another role is to make multilayer labels. The function of back printing is to print the registered trademark or pattern of the manufacturer on the back of the backing paper, which plays the role of publicity and anti-counterfeiting. What is the basic structure and function of stickers? The adhesive is mainly composed of: surface coating, face material, primer layer, adhesive, release coating, base paper and back coating or back printing. The Guangzhou printing factory has made the following descriptions of the components of the adhesive : (1). Surface coating. Used to change the surface properties of the face material. Such as improving the surface tension, changing the color, adding a protective layer, etc., to make it better to accept ink and easy to print, to achieve the purpose of preventing dirt, increasing the adhesion of ink and preventing the printing of text. Surface coating is mainly used for non-absorbent materials, such as aluminum foil, aluminized paper and various film materials. (2). Adhesive. The adhesive is the medium between the label material and the bonding substrate, and plays a role in connection. According to its characteristics, it can be divided into two types: permanent and removable. It has a variety of formulas, suitable for different face materials and different occasions. Adhesive is the most important component in the technology of self-adhesive materials and the key to the application technology of labels. That is, a silicone oil layer is coated on the surface of the base paper, and coating the silicone oil can make the base paper a very low surface tension, very smooth surface, the role is to prevent the adhesive from sticking to the base paper. (4). Backing paper. The role of the backing paper is to receive the release agent coating, protect the adhesive on the back of the face material, and support the face material so that it can be die-cut, discharged, and labeled on the labeling machine. (5). Face material. That is, the surface material is a material that accepts printed graphics on the front and accepts adhesive on the back and is finally applied to the adherend. Generally speaking, any material that can be deformed flexibly can be used as a fabric for self-adhesive materials, such as commonly used paper, film, composite foil, various types of textiles, thin metal sheets and rubber. The type of face material depends on the final application and printing process. The surface material should be able to adapt to printing and printing, have good ink-retaining properties, and have sufficient strength to accept various processing, such as die cutting, waste discharge, slitting, punching and labeling. (6). Back coating or back printing. Back coating is a kind of protective coating on the back of the backing paper to prevent waste discharge. The adhesive around the rewinded label adheres to the backing paper. Another role is to make multilayer labels. The function of back printing is to print the registered trademark or pattern of the manufacturer on the back of the backing paper, which plays the role of publicity and anti-counterfeiting. (7). Coat the bottom layer. B> Increase the opacity of the fabric; C> Increase the adhesion between the adhesive and the surface material; D> Prevent the plasticizer in the plastic surface material from penetrating into the adhesive, affecting its adhesive performance, resulting in the reduction of the adhesive force of the label and the label falling off. Personal Care & Household Cleaning Personal Care & Household Cleaning,Body Brush,Toilet Cleaning Brush,Massager Hair Brush DONGGUAN BILLION GOODTOP INDUSTRIAL CO., LTD , https://www.bgoodtop.com
(3). Release coating (coating silicon layer)
It is the same as the surface coating, except that it is coated on the back of the face material. The main purpose of coating the bottom layer is:
A> Protect the surface material and prevent the penetration of adhesive.