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PET bottle embryo injection, should pay attention to what?

发布时间::2018/10/23 点击量:
      1, plastic processing
      Due to the presence of lipid based PET molecules, with certain hydrophilicity, aggregates more sensitive to water at high temperature, when the moisture content exceeds the limit, the molecular weight of PET decreased in the processing, products with color, crisp. In this way, the material must be dried before processing, the drying temperature is 150 DEG C, more than 4 hours, usually for the temperature of 170 degrees, 3-4 hours. The null method can be used to test whether the material is completely dry.
      The proportion of recycled materials generally do not exceed 25%, and the recovery of raw materials to dry.
      2, injection molding machine selection
      PET due to stability in the melting point after a short time, while the melting point is higher, so the selection of temperature control, more self plasticizing injection system less friction heat, and products (water outlet) the actual weight of not less than the amount of 2/3 injection machine. Based on these requirements, PET special plasticizing system developed in recent years a small series of ramada. The clamping force is greater than 6300t/m2.
      3, mold and gate design
      PET bottle embryo with hot runner mold forming, mold and injection molding machine template between the best to have insulation board, its thickness is about 12mm, and insulation board must be able to withstand high pressure. Exhaust must be adequate, so as to avoid local overheating or fragmentation, but its exhaust depth is generally not more than 0.03mm, otherwise prone to fly.
      4, melt temperature
      Null method. 270-295 DEG C, GF-PET can be set up to enhance the level of 290-315 C, etc..
      5, injection speed
      Generally, the injection speed is fast, which can prevent premature solidification. But too fast, high shear rate makes the material fragile. The material is usually completed within 4 seconds.
      6, back pressure
      The lower the better, so as not to wear. Generally not more than 100bar. No need to use.
      7, residence time
      Do not use excessive residence time to prevent the decline in molecular weight. Try to avoid the temperature above 300 degrees celsius. If less than 15 minutes. Only for the empty shot; if more than 15 minutes, then use the viscosity PE clean, and the barrel temperature to PE temperature, until the restart.
      8, matters needing attention
      The recycled material can not be too large, otherwise easy to produce in the material at the "bridge" and the effect of plasticization.
      If the mold temperature control is not good or the material temperature control is undeserved, easy to produce "white and opaque". The mold temperature is low and uniform, the cooling speed is fast, and the crystal is transparent.


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