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　　PE雙壁波紋管在實(shí)際生產(chǎn)過程中，會遇到擴(kuò)口不良的問題，下面我們將具體分析。

　　PE double-wall bellows in the actual production process, will encounter the problem of poor expansion, below we will analyze in detail.

　　(1)內(nèi)層吹破原因一般有內(nèi)層空氣壓力過大;原材料韌性差;內(nèi)層太薄;所述擴(kuò)口排氣口啟動較晚或所述擴(kuò)口排氣管不暢通;原料中含有雜質(zhì);材料塑化不良等。

　　(1) The causes of inner blowing are generally excessive air pressure in the inner layer, poor toughness of raw materials, too thin inner layer, late start-up of the flared exhaust port or blockage of the flared exhaust pipe, impurities in raw materials, poor plasticization of materials, etc.

　　(2)火焰內(nèi)外層附著不好。如果這一現(xiàn)象在開始時(shí)發(fā)生，則是因?yàn)閮?nèi)部空氣鼓風(fēng)啟動較晚或相應(yīng)的截面壓力過小;如果發(fā)生在端部，則是由于內(nèi)部推力的過早端或燃燒和排氣的過早端，或由于相應(yīng)部位的壓力太小。如果從頭到尾膠合不好，可能是由于原材料的性能或溫度問題。

　　(2) The inner and outer layers of the flame do not adhere well. If this phenomenon occurs at the beginning, it is because the internal air blast starts late or the corresponding cross-section pressure is too small; if it occurs at the end, it is because the internal thrust is too early or the combustion and exhaust is too early, or because the pressure at the corresponding part is too small. If the cementing is not good from beginning to end, it may be due to the performance or temperature of raw materials.

　　(3)端面擴(kuò)口不完全，無論如何調(diào)整擴(kuò)口都不能卡住，原因一般是內(nèi)部空氣沖到一個(gè)較早的端面;擴(kuò)口和排氣提前結(jié)束。

　　(3) The end-face enlargement is incomplete and can not be jammed by adjusting the enlargement in any case. The reason is that the internal air rushes to an earlier end-face; the end of the enlargement and exhaust is ahead of schedule.

HDPE雙平壁鋼塑復(fù)合纏繞管

　　(4)前端的內(nèi)腔有凹進(jìn)去的現(xiàn)象，造成這種現(xiàn)象的原因一般是內(nèi)部空氣起動過早;水套中線偏離模型模塊中線(成型機(jī)與水套位置不相同);內(nèi)壁薄;內(nèi)部真空過早地停止。

　　(4) There is a concave phenomenon in the inner cavity of the front end, which is generally caused by the premature start of internal air; the deviation of the middle line of the water jacket from the middle line of the model module (the position of the forming machine is different from that of the water jacket); the thin inner wall; and the premature stop of the internal vacuum.

　　(5)火焰端內(nèi)層堆積，這種現(xiàn)象往往導(dǎo)致火焰進(jìn)入凹形。其原因是擴(kuò)口端內(nèi)層過厚。注塑機(jī)在此段減速量過大;前幾段內(nèi)推力過大;內(nèi)層材料溫度太高，毛坯太軟。這部分外毛坯太厚了。

　　(5) The inner layer of the flame end accumulates, which often causes the flame to enter concave shape. The reason is that the inner layer of the expanding end is too thick. In this section, the deceleration of the injection moulding machine is too large; in the first few sections, the thrust is too large; the temperature of the inner material is too high, and the blank is too soft. This part of the outer blank is too thick.

　　6. 擴(kuò)口的內(nèi)層末端有凹形，其原因一般是擴(kuò)口后波和第二波壓力過小;波和第二波的內(nèi)壁厚度過厚。內(nèi)真空度小或內(nèi)真空度啟動太晚;原材料的韌性較差。

　　6. There is concave shape at the inner end of the enlargement. The reason is that the pressure of the first wave and the second wave after the enlargement is too small, and the thickness of the inner wall of the first wave and the second wave is too thick. The internal vacuum is small or the internal vacuum starts too late; the toughness of raw materials is poor.