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Introduction of polyethylene

by:Qusheng     2020-11-11
( Polyethylene) - Hereinafter referred to as PE
English name: Polyethylene
proportion: 0. 94 - 0. 96 g/cm3 molding shrinkage rate: 1. 5 - 3. 6% molding temperature: - 140 220 ℃ drying conditions:
the material performance, corrosion resistance, electrical insulation, Especially high frequency insulation) Good, can chloride, irradiation modification, glass fiber reinforced. The melting point of low pressure polyethylene, rigidity, hardness and high strength, small water imbibition, good electric properties and radiation resistance; High pressure polyethylene softness, elongation, impact strength and permeability is better; Ultra-high molecular weight polyethylene high impact strength, fatigue resistance, wear resistance. Low pressure polyethylene is suitable for making corrosion resistant parts and insulation parts. High pressure polyethylene thin films are suitable for, etc. ; Ultra-high molecular weight polyethylene is suitable for making shock absorption, abrasion resistance and transmission parts. 1
forming performance. Small crystal material, moisture absorption, need not to fully dry, liquidity excellent liquidity is sensitive to pressure, molding time with high-pressure injection, uniform temperature, filling speed, pressure. Not use direct gate, prevent uneven contraction, the internal stress increased. Pay attention to choose the gate location, to prevent shrinkage and distortion.
  2. Scope and contraction value is large, clear direction, easy to deformed. Cooling speed should be slow, mold slag hole, and a cooling system.
  3. The heating time shoulds not be too long, otherwise it will decompose, burns.
  4. Soft plastic parts have shallow lateral recess, forced demoulding.
  5. Melting body fracture may occur, unfavorable contact with organic solvent, to prevent cracking.
high pressure low density polyethylene ( LDPE) And high density polyethylene ( HDPE) And linear low density polyethylene ( LLDPE) 。 Film is its main processing products, followed by sheet and coating, hollow containers such as bottles, cans, barrels and other all kinds of injection molding and blow molding products, pipes and wire, cable insulation and sheath, etc. Mainly used in packaging, agriculture and transportation department.
commercial high density polyethylene ( HDPE) , the density of 0. 945-0. 96 grams/cubic centimeter, melting point of 125 ~ 137 ℃; Linear low density PE (
LLDPE) , the density of 0. 925 grams/cubic centimeter, melting point of 120 ~ 125 ℃;
high pressure low density PE ( HP- LDPE) , the density of 0. 918 grams/cubic centimeter, melting point of 105 ~ 115 ℃.
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