Shanghai Daoqin Plastics Co., Ltd.

        毛刺 large more in separation combined upper, 即动模 and between, slip block slip 配部位, parts 缝隙, 顶杆孔隙 and other 处流入熔 material, in made parts upper formed more flash 毛刺.

         this flash flash/burrs 毛刺, in molding 时起杠杆 function, make flash 毛刺进一步 increase large, from formed mold local 凹陷, formed flash 毛刺进一 increase large property ring. therefore, if 一开始发现 generate flash 毛刺, must 尽早修整 mold.

        毛刺 generate has lower types causes

        1.  clamping force 不足

         and molding made parts 投影面积 versus ratio, if clamping force relatively small, due to injection pressure function make 动, between will 出现缝隙, this 样势必就会出现 flash 毛刺. especially is gate made parts in 央附近 孔 upper 时, is this type of molding gate need relatively large injection pressure, therefore easy 出现毛刺.

         reduce injection pressure or improve/increase clamping force can remove this type of defect, according to specific 情况改 use flow property good plastics using/adopting low pressure molding, has is very has formed 效.

        2.  mold local combined 不严密

        首先讨论动, clamping issues, tube/pipe mold clamping 严密, using/adopting 肘杆式锁模 machine injection machine molding 时, 往往因 mold degree or 者锁模 plant/unit adjustment defect, generate left right 两边锁模不均衡 phenomenon, left right has —边 by 锁紧, 另—边不密贴, 此时必 must adjustment 拉杆(二根 or 四根拉扦) make 之均衡仲展.

         its 次, has mold 本身研配不佳造 formed 密贴不严. especially is made parts in has molding 孔时, due to this separation function, clamping force 不充足时也容 easy 出现毛刺.

         another is sliding type 芯, 因沿动 type is as machine 构, generate 毛刺, therefore sliding type 芯 配 combined very important. especially is for left right separation type 哈夫模, its 侧面 投影面积也受 molding pressure function, if design very can full this pressure 也常会出现毛刺. about/regarding parts and 顶杆孔隙, not only generate 毛刺恶 property ring increase large phenomenon, but also also increase large ejection retardant force.

        3.  mold 挠曲引起

         if mold degree 不足, injection pressure function will generate 挠曲, this in 心附近 has 孔, 孔 周边就会 generate 毛刺; also has utilizing in 心孔开侧 gate 时, and 浇道周边也会 generate 毛刺. this type of causes generate 毛刺, is mold made as defect formed, therefore relatively difficult 修理. 采取补 strong/high mold, can make decrease small.

        4.  plastics flow property good

         mono pure is due to plastics flow property good, in upper is generate causes. can is, plastics flow property good 时, that is micro fine plastics can 钻进, therefore easy 出现毛刺. need remove this type of 毛刺, can reduce material temperature degree or injection pressure, can reduce mold temperature degree or injection speed degree,

        5. 注入熔 material more

         this is generate 毛刺 直接 causes. is anti shrink 孔而注入 more material as method is 错误, 应采取 increase injection time or holding pressure time molding (参照 shrink 孔).

        6.  mold surface has material

         mold clamping upper has material, 必然会 generate 毛刺. solution this issues, 显然应清扫于净 mold surface, make clamping 面密贴即 can.