1: PP (Polypropylene): Polypropylene is another excellent resin type developed after nylon. It is a kind of linear polymer with high density, no side chain and high crystallization, and it has excellent comprehensive performance. It is white translucent and waxy when not painted; lighter than polyethylene. The transparency is also better than polyethylene and harder than polyethylene.
Low density, strength and stiffness, hardness and heat resistance are better than low-pressure polyethylene, and can be used at about 100 degrees. Plastic box printing has good electrical properties and high frequency insulation resistance from humidity, but it becomes brittle at low temperatures and is not tolerant. Easy to age. Suitable for general mechanical parts, corrosion-resistant parts and insulating parts
(1). Crystalline material, small moisture absorption, prone to melt fracture, long-term contact with hot metal easily decomposed.
(2). The fluidity is good, but the shrinkage range and the shrinkage value are large, and it is easy to produce shrinkage holes, dents and deformation.
(3) Cooling speed, gating system and cooling system should be slowly cooling, and pay attention to control the molding temperature. Material temperature is low direction of obvious direction. Especially low temperature and high pressure, mold temperature is less than 50 degrees, the plastic parts are not smooth, Easy to produce poor welding, leaving marks, warpage easily occur above 90 degrees
(4). The thickness of the plastic wall must be uniform to avoid lack of glue, sharp corners, to prevent stress concentration.
2: PVC (Polyvinyl chloride) that is polyvinyl chloride. PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material. In practice, PVC materials often include stabilizers, lubricants, auxiliary processing agents, colorants, impact modifiers, and other additives.
PVC material has non-flammability, high strength, weatherability and excellent geometric stability. PVC is very resistant to oxidants, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid, concentrated nitric acid, and is not suitable for applications in contact with aromatic hydrocarbons and chlorinated hydrocarbons.
PET (Polyethylene Terephthalate) is polyethylene terephthalate. Is a common resin in life, PET can be divided into APET, RPET, PETG.
The molecular structure of PET is highly symmetric and has a certain ability of crystal orientation. Therefore, the plastic box printing has a high film forming property and goodness. PET has good optical properties and weather resistance, and amorphous PET has good optical transparency. In addition PET has excellent abrasion resistance, dimensional stability and electrical insulation. Bottles made of PET have been widely used due to their high strength, good transparency, non-toxicity, anti-infiltration, light weight, and high production efficiency. The structure of PBT is similar to that of PET, and most of the properties are the same, but the molecular backbone is changed from two methylene groups to four, so the molecules are more compliant and the processability is better.
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