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What are the classification methods for plastic products?

  Raw materials for plastic products 
   Plastic products
   Film, pipe, sheet, container, woven bag, plastic bucket, plastic packaging, plastic weaving, plastic fittings, electronic equipment, electrical equipment, bakelite, foam, leather goods, synthetic leather, artificial leather, ribbon, plastic toys, plastic stationery, Shaped pipe,
   Plastic machinery
   Molding machine, grinding equipment, material processing machinery, drying equipment, welding machine, auxiliary machine, fittings, injection molding machine, extruder, shaped pipe machine, pipe machine, sheet machine, sheet machine, film machine, granulator, blowing Plastic machine, blister machine, packaging equipment,printing equipment, detector, plastic machine parts, compression molding machine,
   Engineering plastic
   Polycarbonate (PC), ABS alloy, thermoplastic elastomer, polycarbonate copolymer, polyetherimide, polyphenylene oxide (PPO), polyoxymethylene (POM), plastic auxiliaries
   Pigments, masterbatch, brighteners, flame retardants, lubricants, fillers, stabilizers, antioxidants, plasticizers, tougheners, nucleating agents, foaming agents, dispersants, brighteners, light Stabilizers, antistatic agents, heat stabilizers, slip agents, titanium dioxide, plastic fillers, fillers, colorants, mold release agents, reinforcing agents, antibacterial agents, coupling agents, modifiers
   Plastic products
   Home Appliance Mould, Electronic Mould, Packaging Mould, Aviation Mould, Electromechanical Mould, Building Material Mould, Farm Tools Mould, Craft Mould, Medical Mould, Commodity Mould, Auto Mould,
   Chemical fiber raw materials
   Acrylonitrile, PTA, polyester, caprolactam, nylon, acrylic, polyester chips
   Classification and composition of plastics
   (1) The manufacture of plastic
   Plastic is broken down into basic atoms and molecules with natural materials. Then use cooked pressure and chemical action
   And constitute a plastic molecule. These natural materials, such as wood, petroleum, coal, air, etc., are synthesized to produce high molecular organic compounds.
   (2) Classification of plastics
   Thermoplasticity - softens when heated, solidifies by cooling, and softens if heated again. 
   Thermoset - initially softens when heated. In the injection mold, during heating, the plastic molecules will combine and harden. After hardening, if they are cooked again, they will not soften.
   (3) Manufacture of plastics
   (1) Crystalline plastic-PE. PP. Nylon. PBT. POM. PPS. LCP. sPS. PET. TPx and other characteristics:
   (A) has a distinct melting point.
   (B) When the solid is in a regular arrangement, the strength is strong and the tensile force is strong.
   (C) Larger than volume change during melting, about 30% expansion (cover: cm3/g)
   (D) The density value becomes lower after melting, so it is easier to shrink after curing. 
   (E) The molecular chains are closely arranged, so the internal stress is not easily released.
   (F) The cooling and forming consistency is increased, so the finished product is opaque.
   (G) The heat dissipation during forming is slow, so the finished product is particularly hot after being released from the mold.
   (H) At the time of cold mold production, the shrinkage rate was small at the time, because the degree of crystallization was low, resulting in a large shrinkage in the future.
   (I) At the time of hot mold production, the shrinkage rate was large at the time, due to the high degree of crystallization and the small shrinkage in the future.
   (J) If the hot mold production is cooled slowly, the higher the degree of crystallization, the better the physical state, and the more opaque it is.
   (K) Features such as heat resistance and chemical resistance.
   (L) specific volume: PE is 1.03 cm3/g at 20 °C, 1.33 cm3/g at 200 °C, and the increase rate is 29%
   (2) Non-crystalline plastics: PS, AS, ABS, PMMA (acrylic), PC, NORYL, PVC, PES (poly), CA.
   Characteristics: (A) no obvious melting point
   (B) When the solid is in an irregular arrangement, the strength and tensile force are weak.
   (c) The melting volume is not large, and the expansion is about 8% (unit: cm3/g)
   (d) The change in density value after melting is small, and it is less likely to shrink after curing.
   (E) transparency is due to low crystallinity
   (F) The heat dissipation during forming is faster, so the finished product is less hot after being released from the mold.  
   (G) The higher the material temperature, the brighter the color.
   (H) specific volume: PS is 0.97 cm3/g at 20 °C · 1.04 cm3/g at 200 °C is 8.3%