注塑技术、(国外英文资料).docVIP

注塑技术、(国外英文资料) Common adverse effects of products and Countermeasures First, missing material: resin is not fully filled with mold groove, resulting in part of the lack of finished products phenomenon 1., lack of measurement: increasing metering; delaying switching; holding position; increasing back pressure; reducing back material; reducing the temperature under hopper Liquidity 2. material is not good: the increase of barrel temperature increase the mold temperature increased the pressure increasing return [amorphous] / lower crystallinity of the feed back [] the higher injection speed and injection pressure. The increased pressure The air circulation in the 3. mould groove is not good: (1) reduce the speed of injection; reduce the clamping force; change the holding position in advance Two, overflow, flying: dissolve resin from the die joint surface overflow 1. clamping force is insufficient: increasing clamping force, reducing the injection pressure, reducing the injection velocity, and reducing the packing pressure 2. good liquidity materials: to reduce the pressure to reduce injection pressure lowering the injection speed decreasing barrel temperature and reduce the mold temperature reducing feed back [amorphous] / lower crystallinity of the feed back [] The early pressure switch position Liquidity 3. material is not good: the increase of barrel temperature increase the mold temperature increased the pressure increasing return [amorphous] / lower crystallinity of the feed back [] the higher injection speed and injection pressure. The increased pressure 4., many measurements: (1) early change the pressure holding position; reduce the measurement Three, voids and voids: voids and voids appear in the finished products 1. injection (injection pressure, holding pressure) insufficient causes excessive shrinkage: increased pressure, dwell time and pressure increase the early switch position of injection pressure and injection speed and reduce the decrease of mold temp