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盛業(yè)塑膠原料有限公司
主營產(chǎn)品： 工程塑料，通用塑料，熱塑性彈性體 |
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盛業(yè)塑膠原料有限公司
主營產(chǎn)品： 工程塑料，通用塑料，熱塑性彈性體 |
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更新時間：2018-05-15 17:41:41瀏覽次數(shù)：295
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表面沉:
這是產(chǎn)品表面的沉,也稱為縮痕。
下列預(yù)防措施實際上是有效避免這種情況。
(1)設(shè)置注入壓力高。
(2)擴展在注入高壓持續(xù)時間。
(3)設(shè)置氣缸溫度低。
(4)設(shè)置在塑化螺桿旋轉(zhuǎn)的數(shù)量小。
(5)對薄壁成型,模具溫度不是很高。
(6)產(chǎn)品的厚度變化,另外提供一個門在厚的部分。
(7)提高樹脂飼料,使補償收縮的蛀牙必須持有高壓注射的一步。止回閥是用于這一過程。
(8)統(tǒng)一模具的表面溫度。
(9)放大澆道截面的流道和澆口,縮短的長度使樹脂流更容易,并設(shè)置氣缸溫度低。
Surface sink：
This is the sink of product surface that also called as sink mark.
Preventive measures listed below are actually effective to avoid this.
(1) Set the injection pressure higher.
(2) Extend the high-pressure duration at injection.
(3) Set the cylinder temperature lower.
(4) Set the number of screw rotation at plasticization smaller.
(5) For the thin wall molding, set the mold temperature not to be so high.
(6) For a product having thickness variation, provide a gate additionally at the thick part.
(7) Increase resin feed amount to enable to compensate the shrinkage in the cavities at the injection step required to hold high-pressure. Check-valve is useful for this process.
(8) Uniform the surface temperature of mold.
(9) Enlarge the cross section of sprue, runner and gate, shorten the length of them to make the resin flow easier, and set the cylinder temperature lower.
