Shanghai Daoqin Plastics Co., Ltd.

一, 两 不利于 solution sink marks difficult temperature degree conditions

1） mold temperature degree low 不利于 solution sink marks difficult 题

hard parts sink marks issues (surface shrink and internal shrink 孔)都 is is cooling shrinkage 时, in shrinkage lower 空间 不 to water direction 熔胶充 separation 补充而造 formed defect. therefore, 不利于补 shrink factors effect/influence to solution sink marks issues.

more 数人都知道, mold temperature degree high easy generate sink marks issues, usually 都喜欢 reduce mold temperature degree solution issues. is has if mold temperature degree low, 也不利于 solution sink marks issues, this is very more 人不太 attention/notes to.

mold temperature degree low, cooling fast, water relatively 远 稍 thick 胶位, due to in 间部份 cooling fast by 封死 补 shrink 通道, 远处便 不 to 熔胶 充 separation 补充, make sink marks issues more difficult solution, thick large injection molding parts sink marks issues is 突出.

again 者, mold temperature degree low, 也不利于 increase injection molding parts overall shrinkage, make in shrinkage amount increase, sink marks issues more add heavy obvious.

therefore, in solution comparison difficult sink marks issues 时, need 记 检查一 lower mold temperature degree has benefits. has experience technology usually use 手 触摸一 lower mold type surface. types raw materials has it combined mold temperature degree. 例如PC material shrink issues, if 经常清理 shrink to relatively good improvement, mold temperature high, injection molding parts also 会出现 sink marks issues.

2）熔胶 temperature degree low 也不利于 solution sink marks difficult 题

同样 is large more 数人都知道, temperature degree high, injection molding parts easy generate sink marks issues, reduce temperature degree 10~20℃, sink marks issues to improvement.

但 if injection molding parts in certain comparison thick large 部位出现 sink marks 时, again temperature degree low, ratio 如接近 injection molding temperature degree lower 限时, 反而不利于 solution sink marks issues, also more add heavy, injection molding parts thick 情况就越 obvious.

causes and mold temperature low versus 似, cold fast, from sink marks to water between method formed relatively large has 利于补 shrink temperature degree 差, sink marks 位置 补 shrink 通道会 早 by 封死, issues solution more add difficult. 由此也 can 看出, cold speed degree fast 越不利于 solution sink marks issues, PC material is cold versus fast raw materials, therefore it shrink issues can is injection molding large difficult 题.

in addition, temperature degree low 也一样不利于 increase overall shrinkage amount, 导致集 in shrinkage amount increase, from add sink marks issues.

therefore, in machine solution relatively difficult sink marks issues 时, 也应检查一 lower temperature degree is low is important, remove temperature degree table/sheet, use methods 检查一 lower temperature degree and flow property comparison 直观.

二, speed degree fast has solution sink marks heavy issues

solution sink marks issues, 首先会想 to is rise high pressure and long time. if speed degree already very fast, 就不利于 solution sink marks issues. therefore has sink marks difficult remove 时, combined reduce speed degree solution.

reduce speed degree, can make in front 面 熔胶 and water between formed relatively large temperature degree 差, has 利于熔胶由远至近顺序凝 solid and shrink, meanwhile has 利于距 water relatively sink marks obtain relatively high pressure 补充, for issues solution has very large 帮助.

due to reduce speed degree, in front 面 熔胶 temperature degree relatively low, speed degree also already slow, injection molding parts easy generate 批锋, pressure and time can again rise high and long 一, this also more has solution sink marks heavy issues.

in addition, if again using/adopting speed degree more slow, pressure more high, time more long most rear grade 末端充 type and grade decrease slow add pressure holding pressure methods, will more add obvious. therefore method 一开始便 using/adopting relatively slow speed degree 射胶时, from rear 期开始 using/adopting method is very good remedy method.

不 need value is, type in slow also 会不利于 solution sink marks issues. is and other to type 腔 时候, 熔胶都 already full cold 冻, 就像熔胶 temperature degree low 一样, 根本就没 has can force again for sink marks 进行补 shrink.