Paper material label refers to labels printed or printed with barcodes, which are now available in major supermarkets, shopping malls, etc. The raw materials of paper material label largely determine the printing effect of the label and the length of durability. So it is very necessary for the buyer to know what the label paper raw materials are. Here, I will introduce to you.
Paper material label is also called self-adhesive label material. It is a composite material with paper, film or special material as the fabric, adhesive on the back and silicone coated paper as the base paper.
1, surface coating
Used to change the surface characteristics of the face material, such as improving the surface tension, changing the color, adding a protective layer, etc., to better accept the ink and easy to print, to prevent dirt, increase the adhesion of the ink and prevent the printed image from falling off. . Surface coatings are mainly used for non-absorbent materials such as aluminum foil, aluminized paper, and various film materials. The main materials used include transparent polyester, translucent polyester, transparent oriented stretched polypropylene, translucent oriented stretched polypropylene, transparent polyvinyl chloride, light white polyvinyl chloride, matt white polyvinyl chloride, synthetic paper. , light gold polyester, matt gold polyester and so on.
2, face material
That is, the surface material is a material that receives the printed image on the front side, accepts the adhesive on the back side, and finally applies to the object to be pasted. The type of facestock depends on the final application and the printing process. The main types of surface materials are as follows:
(1) Paper-based surface materials: mainly used for information labels for products such as medicines, food, wine, electrical appliances, and stationery. For example, mirror coated paper, coated paper, matt paper, specialty paper.
(2) Film type surface material: It is mainly applied to bar code labels in the daily chemical, food, beverage and electronics industries. For example, polypropylene film (ie BOPP film), polyester film (ie PET film), polyvinyl chloride film (ie PVC film), polyethylene film (ie PE film), polystyrene film (PS film), polycarbonate Ester (PC), polyamine vinylamine (POLYIMIDE), synthetic film.
(3) Special surface materials: such as synthetic paper, aluminum sheets, textiles and various composite materials.
3, the bottom layer
Coated on the back side of the face material, the main purpose of this layer is to protect the surface material, prevent the penetration of the adhesive; increase the opacity of the fabric; increase the bonding force between the adhesive and the surface material; prevent the plastic surface material The plasticizer penetrates into the adhesive, affecting the performance of the adhesive, resulting in a decrease in the adhesive strength of the label and a loss of the label. The material is the same as the surface coating.
On the one hand, the adhesive ensures a proper adhesion between the base paper and the facial tissue, and on the other hand, it ensures that the adhesive paper has good adhesion to the adhesive after being peeled off. There are many types of adhesives, and different formulations can be selected according to different face materials, substrates and different occasions. Adhesives have a direct impact on the performance of self-adhesive materials and are one of the main properties for measuring self-adhesive printed materials.
According to its bonding characteristics, it can be divided into two types: permanent and removable; according to its chemical composition, it can be divided into rubber base and acrylic base; according to the coating method, it can be divided into three types: hot melt type, solvent type and emulsion type; According to the scope of application, it is divided into general type, special type, medical type, low temperature type and high temperature type.
5, silicone oil layer
That is, the silicone oil layer is coated on the surface of the base paper, and the silicone oil layer is applied to make the base paper a surface with a very low surface tension and a smooth surface, so as to prevent the adhesive from sticking to the bottom paper, and to ensure that the label paper and the bottom paper are easily separated.
6, the bottom paper
Also known as release paper or release paper, the role of the base paper is to accept the release agent coating, the protection label is not smeared before use, the bottom paper also has the role of support, to ensure that in the process of processing the label, such as die cutting , waste and label on the labeling machine, the label will not bend or curl. The backing paper can be divided into paper backing paper and film backing paper. According to different processing techniques, paper-based paper can be divided into super-calendering paper, machined calendering paper, and surface-coated bottom paper.
7, back or back printing
The back coating is a protective coating on the back side of the backing paper to prevent the adhesive around the label after the waste, rewinding from sticking to the bottom paper, and the other is to manufacture a multi-layer label. The back printing function is to print the manufacturer's registered trademark or pattern on the back of the backing paper for publicity and anti-counterfeiting. The material is the same as the surface coating.