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About PP plastic pallets and product injection molding process
Information from£ºAdmin Date£º2012-03-19 Hits£º

    PP chemical called polypropylene, in the production of plastic pallets and plastic pallets, the main use of this raw material, the use of another PE, more.

    PP plastic rheology in the molten state is good, the impact of pressure on the viscosity than the temperature, therefore, mainly from the pressure begin to change the mobility of the PP melt, thus producing a better quality plastic pallets.

    Processing of a plastic pallets

    PP macromolecules containing lipid-based, with certain hydrophilic aggregates more sensitive to water at high temperatures, when the moisture content exceeds the limit in the processing of PP molecular weight decreased, plastic pallet products with color, become brittle. Trapped before in the processing of the material to dry, the drying temperature of 150 ¡ã C for 4 hours or more, usually 170 ¡ã C ,3-4 hours.

    The proportion of recycled material in the plastic pallets generally should not exceed 25%, and recycled materials should be thoroughly dried.

    2, the selection of injection molding machine, plastic pallets

    PP plastic and stable in the melting point after a short time, while the melting point is comparatively high, so the need to use temperature control segment more, plasticizing from less friction and heat injection system, and the actual weight of the products (including outlet material) can not be less than machine injection volume of 2/3.

    3, the pallets mold and gate design

    PP general molding, hot runner mold between the mold and the injection molding machine template is better to have insulation panels, its thickness is about 12mm insulation board will be able to withstand high pressure. The exhaust must be sufficient to avoid local overheating and fragmentation, but its exhaust port depth is generally not more than 0.03mm, otherwise prone to flash.


    5, the injection speed of the plastic pallets

    General injection speed to be fast, to prevent premature solidification of the injection. But too fast, the shear rate so that the material fragile. Shot material is usually completed within four seconds.

    6, plastic pallets injection Note
    (1) plastic pallets recycling material can not be too much, otherwise it is easy to produce the next expected at the "bridge" and affect the plasticizing.
    ¢Æ If the mold temperature control bad or material inappropriate temperature control, easy to produce "white mist" instead of translucent.

    The above information is from Shenzhen e-dian some experience in the production of plastic pallets.

TAG£º pp, pp plastic pallets, pp plastic pallets, plastic injection, plastic pallets
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