PE双壁波纹管在实际生产过程中，会遇到扩口不良的问题，下面我们将具体分析。

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

　　(1)内层吹破原因一般有内层空气压力过大;原材料韧性差;内层太薄;所述扩口排气口启动较晚或所述扩口排气管不畅通;原料中含有杂质;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)火焰内外层附着不好。如果这一现象在开始时发生，则是因为内部空气鼓风启动较晚或相应的截面压力过小;如果发生在端部，则是由于内部推力的过早端或燃烧和排气的过早端，或由于相应部位的压力太小。如果从头到尾胶合不好，可能是由于原材料的性能或温度问题。

　　(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)端面扩口不完全，无论如何调整扩口都不能卡住，原因一般是内部空气冲到一个较早的端面;扩口和排气提前结束。

　　(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双平壁钢塑复合缠绕管

　　(4)前端的内腔有凹进去的现象，造成这种现象的原因一般是内部空气起动过早;水套中线偏离模型模块中线(成型机与水套位置不相同);内壁薄;内部真空过早地停止。

　　(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)火焰端内层堆积，这种现象往往导致火焰进入凹形。其原因是扩口端内层过厚。注塑机在此段减速量过大;前几段内推力过大;内层材料温度太高，毛坯太软。这部分外毛坯太厚了。

　　(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. 扩口的内层末端有凹形，其原因一般是扩口后波和第二波压力过小;波和第二波的内壁厚度过厚。内真空度小或内真空度启动太晚;原材料的韧性较差。

　　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.