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The size of the internal pressure of blow molding machinery

  Blow molding machinery required compressed air, the air pressure depends on the performance of the raw material and the product temperature of the parison. Control the pressure of compressed air generally 0.2 ~ 0.7MPa. Low viscosity materials, take the low air pressure; material viscosity is high, take the higher air pressure. When the wall thickness of low air pressure check; take higher air pressure when the thin wall products.
  Injection blow molding machinery polyethylene hollow products available low density polyethylene, high density polyethylene, linear low density polyethylene and ultra high molecular weight polyethylene resin. These types of resin application conditions in the following areas.
① claim density LDPE 0.918 ~ 0.924g/cm3, a melt flow rate MFR of 0.25 ~ 1.5g/10min hollow molded article strength is relatively low, but better flexibility and transparency, and mainly for household pesticides cosmetics and other thin-walled container packaging.
② requirements of high-density polyethylene density 0.951 ~ 0.957g/cm3, melt flow rate MFR of 0.2 ~ 0.8g/10min; molding hollow products high strength, rigidity, mainly used in chemical and pharmaceutical packaging containers larger hollow .
③ required density of LLDPE 0.918 ~ 0.920g/cm3, melt flow rate MFR of 0.2 ~ 0.8g/l0min; molding hollow products rigidity, impact resistance, resistance to cracking, and more generally for the more expensive , large capacity container packaging.

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