Shanghai Daoqin Plastics Co., Ltd.

formed 因:

in made parts direction gate design in, injection molding made parts surface 出现 以 gate is in 心 由 different color deep degree and gloss formed system, is light 芒线. large has types performance, deep color dark color 线, dark color deep color and in gate dark color 线密而发白.

this category of defect large more in made polystyrene (PS) and modified polystyrene (PS) mixed combined material 时出现, and lower factors has 关: types material in property, color property and other has 差异, system 平流层 and 紊流层流 speed and hot has 差异; plastics hot separation understanding formed filament; plastics 进模时 gas material dry 扰.

solution measures:

①. using/adopting mixed combined plastics 时, need mixed combined good plastics, plastics pellets large small need same and uniform.  

②. plastics and color agent need mixed combined uniform, necessary need add 入适当 dispersant, use machine mixed combined.

③.塑化 need full, machine 台 塑化 property can need good.

④. reduce injection pressure and speed degree, shrink short injection and holding pressure time, meanwhile improve/increase mold temperature, improve/increase temperature degree, meanwhile decrease/reduce front temperature degree.

⑤. anti plastics degradation formed viscous property increase large material and material 质: attention/notes screw and material is abrasion loss in 死角, or add temperature system 失控, processing as 不当造 formed plastics long add hot separation understanding. can through light screw and material front inner surface.

⑥.改进 gate design, large gate 直径, gate 位置, will gate formed 圆角 渡, for gate local add hot, in runner add cold material 井.

2. cold material 斑

formed 因:

cold material main/primary is made parts gate belt/tape has color or color or from gate 出发 宛如若蚯蚓贴 in upper bending 疤痕, it 们由进入 type plastics front or separation holding pressure function rear type cold material formed;

front material is or runner cooling function hot amount, in type front separation by cooling solid 化, through narrow gate expand 张注入 type 腔时, formed melt 破裂, also by rear hot material 推拥, is formed cold material 斑.

solution measures:

①. cold material need good. also need gate upper 形式, large small and 位置, anti material cooling speed degree 悬殊.

②.射嘴 in degree need good, and mold material upper combined dimensions need design good, anti material or formed has cold material by belt/tape type 腔.

③. mold gas degree good. gas dry make gate mixed property 斑纹.

④. improve/increase mold temperature. decrease slow injection speed degree, increase large injection pressure, decrease low holding pressure and injection time, decrease low holding pressure pressure.

⑤. drying good plastics. less use lubricant, anti powder material by 污染.