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PVC发泡板出现破泡有哪些原因
作者:admin 来源:本站 发布时间:2018-03-20 17:09:25 浏览次数:366
PVC发泡板在客车、火车车厢顶棚、箱体芯层等方面广泛被应用,在生产过程中有时会出现破泡现象,引起发泡板破泡主要有哪些原因呢?
PVC foam board is widely used in passenger cars, train carriages, box core and so on. In the production process, sometimes there will be bubbles and bubbles. What are the reasons for bubbles?
山东挤塑板在生产实践中,大部分破孔都是局部泡孔不均匀膨胀后,熔体强度降低所致。熔体本身强度过低与熔体周边压力偏小的因素很多,概括起来,主要表现在以下几个方面:

In the production practice of Shandong extrusion plate, most of the holes are caused by the uneven expansion of the local bubble and the decrease of the melt strength. There are many factors in the low strength of the melt and the smaller pressure around the melt. In summary, it is mainly shown in the following aspects:

山东挤塑板

PVC树脂一般根据其聚合方法可分为乳液法PVC和悬浮法PVC及本体PVC三种。生产硬质PVC发泡产品时,如采用乳液法PVC树脂可得到泡孔均匀,表面光滑的制品,但制品的尺寸稳定性难以控制;且乳液法PVC树脂生产的成本较高;若采用悬浮法PVC树脂,产品的外观质量和泡孔均匀度稍差。
In general, PVC resin can be divided into three kinds, namely, emulsion method PVC, suspension PVC and bulk PVC according to their polymerization methods. The production of rigid PVC foam products, such as the use of emulsion polymerization of PVC resin can get the foam evenly, the product surface is smooth, but it is difficult to control the dimensional stability of products; high cost and method for the production of PVC resin emulsion; if the use of PVC resin by suspension method, the appearance of the product quality and uniformity of bubble slightly worse.
山东挤塑板综合工艺、价格及性能等方面,宜将两者按一定比例混用,比例可以为80/20-20/80之间。板材成型横截面积较宽,从挤出机头进入口模要分布到一个相当于1.3米左右的宽度,要得到充分发泡的低密度塑料制品,采用的树脂粘度不宜过高,为了有利于气泡的分散与膨胀,板材整个横截面压力协调一致,对熔体流动性要求高。
Shandong plastic plate comprehensive technology, price and performance, and so on, should be mixed in a certain proportion, the proportion can be between 80/20-20/80. Sheet forming cross-sectional area is wide, from the extrusion head into the die for distribution to an equivalent of 1.3 meters in width, low density plastic products must be fully expanded, the viscosity of the resin should not be used too much, in order to facilitate the expansion and dispersion of bubbles, the whole plate cross section pressure coordinated to melt high liquidity requirements.
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