EN
News & Knowledge
Contact Us
Mobile: +86-19279864570
Email: 40045692@qq.com
QQ: 40045692
Address: Building 5, No. 936 Guoshun Road, Nanqiao Town, Fengxian District, Shanghai
injection molding parts defect silver streaks, what to do?
Date: 2019-11-20 09:49
Views: 2415
Source: Internet
made parts surface material flow direction generate white 纹理（针状 strip/profile or sheet/slice 状云母纹）, is silver streaks. silver streaks is injection molding in most Common defect 之一, silver streaks, most Common causes has wet gas, and hot separation understanding.
water separation: most Common causes is wet gas. in process in, silver streaks in upper 显示并不 is 每次都发生 in 同一 方, or in certain lower, silver streaks in products. 另一 视觉检查 water separation is 手动状态 lower resin. if is foam or bubbles, water separation can can is formed silver streaks causes. from drying machine resin can drying machine in as, resin is is hot. however, it can is drying good. use water separation analysis 仪 验证特定 water separation content. need attention/notes is, has material can can drying, has to wet degree.
一旦 silver streaks causes by is wet gas, must 核实造 formed water separation content high causes. lower 面列出 water separation can can in causes:
1, drying. resin must in manufacturing provide time and temperature degree lower drying. let resin in positive temperature degree lower drying more more time. will front 25磅 from drying machine in 排出, rear heavy new add drying machine inner.
2, drying machine can positive as. 感受烘 dry machine to and 返回空 gas 线路. to 线应该 is hot, 回程线应该 is hot. in addition, good method is has temperature degree device and 探头安装 in soft tube/pipe, gas drying device. if supply temperature degree and setting 点不匹配, or 者返回 temperature degree low setting 点20 °F above, drying machine property can can can 会出现 issues.
3, material material amount positive 确. this 方面 一 例子 is resin small use 60磅, use 100磅 drying machine, material in 1.5 small inner through drying machine. if positive drying time is 2-4 small 时, resin method requirements drying. need attention/notes is, in large more drying machine, from in 心. therefore increase outer time, ensure from in 心排出 resin has time drying. according to 4 small drying time, 5 small 时 处理 amount 就足以 drying. use 300 磅 or more large drying machine.
4, material and drying machine between material material time long. this 方 材 material can in small inner absorption water separation. in 启动时, will 25磅材 material from material 口 装载 system in 排出, material 闸关闭, this will ensure 装载 材 material in drying lower by recycling.
5, mold 泄露. water tube/pipe positive in 泄露, or internal water in mold inner. mold is has water 迹象, positive.
剪切: generally lower, in 同一位置 upper 一 部 separation. has below/following several causes.
1, amount rear decrease pressure. 松退太 more, in material front 面 空 gas. decrease/reduce 松退位置 or speed degree, decrease/reduce resin in gas in. generally 说, 松退距离应该设置 in 0.1-0.4英寸, use it speed degree, to 需 位置.
2, nozzle / mold temperature degree 变化. material from nozzle mold 时, temperature degree large degree decline 会导致开始 filling (cold material 进入). improve/increase mold temperature degree or reduce nozzle temperature degree (流涎)以抵消 this type of 情况.
3, gate dimensions. relatively small gate can can need relatively slow filling speed degree.
4, nozzle 尖端/唧嘴不匹配. in for process is new conditions lower, 验证注入 / or value pressure has 变化. 应检查唧嘴衬 sleeve/set 反复接触引起 毛刺. runner has can 洞察毛刺 情况.
hot separation understanding: more hot amount has similar wet gas appearance. this category of can full cover/cap products, can in separation 各 区域出现不一致 情况. 另一 迹象 can can is hot material odor. below/following is formed hot Common causes:
1, material temperature high. key/critical methods is melt temperature degree. if in this stage/phase, positive in development process, melt temperature degree 应该首先建立 in melt 体窗口 low 端, rear improve/increase, to parts can 接受 状态.
2, back pressure high. need attention/notes is, although back pressure is resin mixed combined key/critical, degree use make resin hot. it also 会导致 separation decrease/reduce, 甚至导致材 material degradation. back pressure 应该考虑 to this amount.
3, resin in 塑化组 in time long. resin in material in time 会导致材 material 退化. types countermeasures is reduce material temperature degree, decrease/reduce time 效应. parts need is screw amount time. screw amount in cooling time front 1.5 至2秒完 formed. products need relatively long cooling time 时, can use front cooling.
through understanding types 情况, can process 改变, remove injection molding processing process in silver streaks.
water separation: most Common causes is wet gas. in process in, silver streaks in upper 显示并不 is 每次都发生 in 同一 方, or in certain lower, silver streaks in products. 另一 视觉检查 water separation is 手动状态 lower resin. if is foam or bubbles, water separation can can is formed silver streaks causes. from drying machine resin can drying machine in as, resin is is hot. however, it can is drying good. use water separation analysis 仪 验证特定 water separation content. need attention/notes is, has material can can drying, has to wet degree.
一旦 silver streaks causes by is wet gas, must 核实造 formed water separation content high causes. lower 面列出 water separation can can in causes:
1, drying. resin must in manufacturing provide time and temperature degree lower drying. let resin in positive temperature degree lower drying more more time. will front 25磅 from drying machine in 排出, rear heavy new add drying machine inner.
2, drying machine can positive as. 感受烘 dry machine to and 返回空 gas 线路. to 线应该 is hot, 回程线应该 is hot. in addition, good method is has temperature degree device and 探头安装 in soft tube/pipe, gas drying device. if supply temperature degree and setting 点不匹配, or 者返回 temperature degree low setting 点20 °F above, drying machine property can can can 会出现 issues.
3, material material amount positive 确. this 方面 一 例子 is resin small use 60磅, use 100磅 drying machine, material in 1.5 small inner through drying machine. if positive drying time is 2-4 small 时, resin method requirements drying. need attention/notes is, in large more drying machine, from in 心. therefore increase outer time, ensure from in 心排出 resin has time drying. according to 4 small drying time, 5 small 时 处理 amount 就足以 drying. use 300 磅 or more large drying machine.
4, material and drying machine between material material time long. this 方 材 material can in small inner absorption water separation. in 启动时, will 25磅材 material from material 口 装载 system in 排出, material 闸关闭, this will ensure 装载 材 material in drying lower by recycling.
5, mold 泄露. water tube/pipe positive in 泄露, or internal water in mold inner. mold is has water 迹象, positive.
剪切: generally lower, in 同一位置 upper 一 部 separation. has below/following several causes.
1, amount rear decrease pressure. 松退太 more, in material front 面 空 gas. decrease/reduce 松退位置 or speed degree, decrease/reduce resin in gas in. generally 说, 松退距离应该设置 in 0.1-0.4英寸, use it speed degree, to 需 位置.
2, nozzle / mold temperature degree 变化. material from nozzle mold 时, temperature degree large degree decline 会导致开始 filling (cold material 进入). improve/increase mold temperature degree or reduce nozzle temperature degree (流涎)以抵消 this type of 情况.
3, gate dimensions. relatively small gate can can need relatively slow filling speed degree.
4, nozzle 尖端/唧嘴不匹配. in for process is new conditions lower, 验证注入 / or value pressure has 变化. 应检查唧嘴衬 sleeve/set 反复接触引起 毛刺. runner has can 洞察毛刺 情况.
hot separation understanding: more hot amount has similar wet gas appearance. this category of can full cover/cap products, can in separation 各 区域出现不一致 情况. 另一 迹象 can can is hot material odor. below/following is formed hot Common causes:
1, material temperature high. key/critical methods is melt temperature degree. if in this stage/phase, positive in development process, melt temperature degree 应该首先建立 in melt 体窗口 low 端, rear improve/increase, to parts can 接受 状态.
2, back pressure high. need attention/notes is, although back pressure is resin mixed combined key/critical, degree use make resin hot. it also 会导致 separation decrease/reduce, 甚至导致材 material degradation. back pressure 应该考虑 to this amount.
3, resin in 塑化组 in time long. resin in material in time 会导致材 material 退化. types countermeasures is reduce material temperature degree, decrease/reduce time 效应. parts need is screw amount time. screw amount in cooling time front 1.5 至2秒完 formed. products need relatively long cooling time 时, can use front cooling.
through understanding types 情况, can process 改变, remove injection molding processing process in silver streaks.
