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塑膠管：pvc塑膠異型材會出現(xiàn)結(jié)晶的原因?

文章出處：公司動態(tài) 責(zé)任編輯：東莞市聯(lián)臻光電材料有限公司發(fā)表時間：2020-08-06

　　? 塑膠管、塑膠異型材是我們生產(chǎn)中很常見的物品，那我們來說說影響熱塑性塑料結(jié)晶現(xiàn)象的原因有那些呢？

1. 熱塑性塑料按其冷凝時無出現(xiàn)結(jié)晶現(xiàn)象可劃分為結(jié)晶型塑料與非結(jié)晶型(又稱無定形)塑料兩大類。

所謂結(jié)晶現(xiàn)象即為塑料由熔融狀態(tài)到冷凝時，分子由獨立移動，完全處于無次序狀態(tài)，變成分子停止自由運動，按略微固定的位置，并有一個使分子排列成為正規(guī)模型的傾向的一種現(xiàn)象。

2. 作為判別這兩類塑料的外觀標準可視塑料的厚壁塑件的透明性而定，一般結(jié)晶性料為不透明或半透明(如POM等)，無定形料為透明(如PMMA等)。但也有例外情況，如聚四甲基戍烯為結(jié)晶型塑料卻有高透明性，ABS為無定形但卻并不透明。

3. 在模具設(shè)計及選擇注塑機時應(yīng)注意對結(jié)晶型塑料時，料溫上升到成型溫度所需的熱量多，要用塑化能力大的設(shè)備。

異型材有兩種，一種是全塑料異型材，另一種是指塑料材料和非塑料材料復(fù)合而得的復(fù)合異型材。

按異型材的軟硬程度分，可分為軟質(zhì)異型材和硬質(zhì)異型材。按塑料品種分類可分為：PVC異型材，AB異型材，PE異型材等，其中大多數(shù)是PVC異型材。

按異型材的截面特征，可分成異型管材、中空異型材、隔塞式異型材、開放式異型材、分節(jié)異型材、鑲嵌異型材、實心異型材7大類。

上一篇: 硅膠與PVC軟膠條主要有以下區(qū)別：

下一篇: PC燈罩還有這些特殊的優(yōu)勢，刮目相看了！

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PC燈罩褪色的因素 PC燈罩褪色的因素燈罩的生產(chǎn)流程包裝管的市場優(yōu)勢 PCTG TX1001與SK YF300的區(qū)別在哪里？什么是PC管？PC管與PVC管的區(qū)別是什么？開工大吉 IECIE霧化科技節(jié) PC透明包裝管的優(yōu)點是什么？ pc和pvc穿線管的區(qū)別是什么？

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