Shanghai Daoqin Plastics Co., Ltd.

what is material flash?
 
　　 flash also material, 溢边, and other, large more in mold separation combined upper, mold separation interface, slip block slip 配部位, parts 缝隙, 顶杆 孔隙 and other 处. flash and solution will 会进一步 expand large 化, from pressure mold formed local 陷塌, most can can formed property loss 害. parts and 顶杠孔隙 溢 material also make products in mold upper, effect/influence demolding!
 

　　 that is what causes generate 呢, 我们该 how to solution this issues 呢? generate causes has lower:
 
　　（1） clamping force 不足
 
　　当 injection pressure large clamping force make mold separation type combined defect easy generate material flash. for 此, 应检查 increase pressure is increase pressure amount, meanwhile 应检查塑 parts 投影面积 and molding pressure is ultra- 出 equipment clamping force. molding pressure is mold inner pressure, 常规情况 lower 以40mpa计算. production 箱形塑 parts 时, polyethylene (PE), polypropylene (PP), polystyrene (PS), and ABS molding pressure value is 30mpa; production relatively deep parts 时, molding pressure value is 36mpa; in production small 于10cm3 small type parts 时, molding pressure value is 60mpa. if 计算结果 is clamping force small parts 投影面积 and molding pressure 乘积, table/sheet clamping force or injection molding pressure high. reduce injection pressure or decrease small material 口截面积, can shrink short holding pressure and increase pressure time, decrease small injection 行程, or decrease/reduce type and use clamping large injection molding machine.
 
　　（2） material temperature high
 
　　 high temperature melt melt viscosity small, flow property can good, material can mold inner very small in generate material flash. therefore, 出现溢 material flash rear, 应考虑适当 reduce material 筒, nozzle and mold temperature degree, shrink short injection cycle.
  for/regarding polyamide (PA) and other viscosity relatively low material, if 仅靠改变 molding conditions solution material flash defect is very difficult. in reduce material temperature meanwhile, amount precision processing and mold, decrease small mold 间隙.
 
　　（3） mold defect
 
　　 injection molding mold defect is generate material flash main/primary causes, in relatively more material flash must true mold, heavy new separation type 面, make and for in, 并检查 separation type is 否密 贴 combined, type and 模芯部 separation sliding parts abrasion loss is ultra- 差. separation type upper has viscous material or 落入异 material, sheet/plate is 否平行, has bending deformation, sheet/plate has mold thick degree adjustment to positive 确位置, combined surface is loss 伤, has deformation 不均, gas is large deep. according to upper 述逐步检查 结果, for/regarding generate can using/adopting machine processing methods troubleshooting.
 
　　（4） process conditions control 不当
 
　　 if injection speed degree fast, injection time long, injection pressure in mold cavity in distribution 不均, speed rate 不均衡, and add material amount more, lubricant use amount 都会导致溢 material flash, as 时应针 for specific 情况采取 versus measures.
  value heavy is, troubleshooting material flash fault/failure must from troubleshooting mold fault/failure 手, if material flash 而改变 molding conditions or raw materials formulation, for other generate defect effect/influence, easy other molding fault/failure.