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您當(dāng)前的位置：首頁(yè) » 新聞中心 » 注塑制品變色焦化出現(xiàn)黑點(diǎn)的原因分析

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注塑制品變色焦化出現(xiàn)黑點(diǎn)的原因分析

發(fā)布時(shí)間：2014-04-23 瀏覽次數(shù)：582 返回列表

注塑制品變色焦化出現(xiàn)黑點(diǎn)的原因分析

　造成注塑制品變色焦化出現(xiàn)黑點(diǎn)的主要原因是塑料或添加的紫外線吸收劑、防靜電劑等在料筒內(nèi)過(guò)熱分解，或在料筒內(nèi)停留時(shí)間過(guò)長(zhǎng)而分解、焦化，再隨同熔料注入型腔形成。分析如下：

1.機(jī)臺(tái)方面：

（1）由于加熱控制系統(tǒng)失控，導(dǎo)致料筒過(guò)熱造成分解變黑。

（2）由于螺桿或料筒的缺陷使熔料卡入而屯積，經(jīng)受長(zhǎng)時(shí)間固定加熱造成分解。應(yīng)檢查過(guò)膠頭套件是否磨損或里面是否有金屬異物。

（3）某些塑料如ABS在料筒內(nèi)受到高熱而交聯(lián)焦化，在幾乎維持原來(lái)顆粒形狀情形下，難以熔融，被螺桿壓破碎后夾帶進(jìn)入制件。

2．模具方面：

（1）模具排氣不衣，易燒焦，或澆注系統(tǒng)的尺寸過(guò)小，剪切過(guò)于歷害造成焦化。

（2）模內(nèi)有不適當(dāng)?shù)挠皖悵?rùn)滑劑、脫模劑。

3．塑料方面：

塑料揮發(fā)物過(guò)多，濕度過(guò)大，雜質(zhì)過(guò)多，再生料過(guò)多，受污染。

4．加工方面：

（1）壓力過(guò)大，速度過(guò)高，背壓過(guò)大，轉(zhuǎn)速過(guò)快都會(huì)使料溫分解。

（2）應(yīng)定期清潔料筒，清除比塑料耐性還差的添加劑。

上一篇：注塑制品白霜的原因分析

下一篇：注塑制品表面光澤差的原因分析

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免責(zé)聲明：本文"注塑制品變色焦化出現(xiàn)黑點(diǎn)的原因分析"僅代表作者個(gè)人觀點(diǎn)，與環(huán)球塑化網(wǎng)無(wú)關(guān)。環(huán)球塑化網(wǎng)所轉(zhuǎn)載的內(nèi)容，其版權(quán)均由原作者和資料提供方所擁有！如因作品版權(quán)問(wèn)題需要處理，請(qǐng)與我們聯(lián)絡(luò)。電話：400-115-2868

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