Shanghai Daoqin Plastics Co., Ltd.

（1）何谓 flash （ appearance ）? although made as mold degree very high （μｍ grade ）, but also molding using/adopting high pressure clamping, due to resin filling pressure very high, therefore upper has very small 缝隙. flash is resin this type of 缝隙而形 formed. in PL面, sleeve/set tube/pipe, slip interface and gas and other 处都会出现 flash. flash is resin mold PL面（ mold separation type 面）, make products belt/tape upper more film this types phenomenon. 当PL面不敌 resin pressure separation 开, or PL面 has 缝隙时就会出现 this type of 情况 （2） flash formed causes (2-1) resin pressure high resin pressure high 时, mold separation generate flash. versus 反, mold pressure low 时, 同样也容 easy generate flash. resin pressure increase high main/primary causes lower: （1） injection speed degree fast 　　（2） injection pressure high 　　（3） holding pressure force high 　　（4）V－P切换偏 slow generally 说, 当希望 obtain good appearance 时, has will holding pressure setting high, especially is is anti 止出现凹痕而 using/adopting high standards setting. this has 时就会 generate flash. (2-2) resin flow property good flow property good, resin 就越容 easy 进入缝隙, therefore flash 也就越 large. generally 说, resin temperature degree and mold temperature degree high, flash 也就越 large; 反之, temperature degree low, flash 也就越 small. (2-3) mold PL面 has 间隙 即 make in simple 2 block mold in, mold has 时也会因 molding product ejection 不当而受 loss, in loss 伤处出现 flash. use slip 芯时, must especially attention/notes combined and sliding 面 缝隙. another, mold is made, clamping pressure belongs to high pressure, resin pressure is and its versus high pressure, therefore in has injection molding in, mold generally 都会发生 deformation. especially is in large type molding product lower is significantly. 此时, has 无支柱 for flash has effect/influence （ if has 支柱, deformation →缝隙就会 increase large, flash increase more ）. (2-4) （ polyphenylene sulfide (PPS) ） PPS resin in low 剪切区 flow property very strong/high, therefore resin its property 质而言就 tool has easy generate flash disadvantages. therefore, and use other material versus ratio, use PPS resin must more add attention/notes anti 止出现 flash. for mold degree and other grade requirements ratio use other material more add 严格. （3） flash countermeasures (3-1) reduce resin pressure reduce resin pressure methods lower: （1）延缓 injection speed degree 　　（2） reduce injection pressure 　　（3） reduce holding pressure force 　（4）略 micro add fast V－P切换　 (3-2) clamping force is parts very 平常 事, also is need 检查一 lower is in setting 错误. (3-3) add fast resin solid if through reduce machine temperature degree and mold temperature degree add fast resin solid 化, flash 就不容 easy 出现. (3-4) mold PL面 请检查PL面 is has or loss 伤. in addition, use per mille table/sheet and other can mold deformation degree. deformation amount large 时, can can 不 不考虑 more mold structure 本身. for/regarding large type molding product, also need research 支柱 设置 methods. (3-5) PPS（ polyphenylene sulfide (PPS) ） resin if is PPS resin, in gas and other very thin 部位也会出现 very large flash. gas thick degree to 10 micron left right, meanwhile increase gas 口 数 amount. in addition, slip and and other degree must high other resin requirements degree.