Plastic bags are widely used in our lives. They are generally composed of synthetic or natural peak self-compounds such as synthetic resins and natural resins. They can be molded into shapes at a certain temperature and pressure, and maintain their shape at room temperature. unchanging material.

The main components of plastics include:

(1) Synthetic resins are artificially synthesized polymers called synthetic resins, also known as high polymers or polymers. It is the main component of plastics and acts as a cement in plastics. The performance of plastics mainly depends on the synthetic resin used.

(2) Stabilizer Any substance that can retard the aging and deterioration of materials is called a stabilizer, also known as an anti-aging agent. It can prevent or inhibit the destruction of polymers caused by heat, light, oxygen, microorganisms and other factors during molding processing or use. It includes heat stabilizers, light stabilizers and antioxidants. Its dosage is generally less than 2%.

(3) Plasticizers A class of substances added to improve the fluidity of plastic molding and enhance the flexibility of products is called plasticizers. Its dosage is generally under 40% of the performance of plastic pc in roll bags.

(4) Fillers Inert substances that can improve certain properties of plastics are called fillers, also known as plastic packing fillers. Such as calcium carbonate, silicate, a soil, talcum powder, wood powder, metal powder, etc. Adding fillers to plastics can improve their molding performance and reduce costs. The amount of filler is generally below 40%.

(5) Reinforcing agent The fibrous material added to improve the mechanical strength of plastic products is called reinforcing agent. The most commonly used reinforcing agents are glass fiber, asbestos fiber, synthetic fiber and hemp fiber.

(6) Lubricant The substance added to improve the fluidity of the plastic melt and the smoothness of the product surface is called a lubricant. For example, fatty acid soaps, fatty esters, fatty alcohols, paraffin, low molecular weight polyethylene, etc. Its dosage is generally less than 1%.

(7) Colorants The substances that can make plastics have color or special optical properties are called colorants. It can not only make the products bright and beautiful, but also sometimes improve the weather resistance of plastics. Commonly used colorants are inorganic pigments, organic pigments and dyes.