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</dl> <div class="pro detail help"> <h3>【原创】怎样提高PVC发泡板质量_河北发泡板公?/h3> <h6>发布时间 : 2019-08-16</h6> 石家?a href="/supply/54.html" target="_blank">康飞</a>塑业有限公司是一家在<b>PVC发泡?/b>较为专业的的公司,所在领域也是相当突出的,今天我们可以来了解一下该公司的详细内?<p style="text-indent:2em;">塑料发泡成型分为三个过程:气泡核的形成、气泡核的膨胀和泡体的固化。对于添加化学发泡剂的PVC发泡片材来说,气泡核的膨胀对发泡片材的质量起决定性影响。PVC属于直链分子,分子链较短,熔体强度低,在气泡核膨胀成气泡过程中,熔体不足以包覆住气泡,气体易溢出合并成大泡,降低发泡片材的产品质量</p><p style="text-indent:2em;">从高分子材料加工特性分析,提高PVC熔体强度的方法有多种,但有效的方式是添加提高熔体强度的助剂和降低加工温度。PVC属于非晶材料,随熔体温度的提高熔体强度降低,反之随熔体温度降低熔体强度提高,但降温的作用有限仅起到辅助作用。ACR类加工剂都有提高熔体强度的作用发泡,康飞PVC发泡板发泡调节剂效果。熔体强度随发泡调节剂含量增加而提?/p><p style="text-indent:2em;"> <span style="color:#0020FF;">更多人会关注</span><span style="color:#0020FF;">?/span> </p><p style="text-indent:2em;"> 稳定性不足,会影响整个板面,板面发黄,发泡片材脆性大</p><p style="text-indent:2em;"> 熔体强度不足会导致发泡片泡孔大,纵切面泡很长。判断熔体强度是否不足,直接的办法是到三辊后面用手指按压包在中辊上的片材,熔体强度好按压时能感觉到弹性。若按压后很难弹起,说明熔体强度较差。因为螺杆结构和冷却方式差别较大,很难判断温度是否合理,一般来说,在挤出机允许的负荷内??区温度以低为好?/p><p style="text-indent:2em;"> 在发泡管材中要想获得发泡均匀制品,也需要保证PVC物料有良好的融体强度。公司开发的发泡助剂就是为解决康飞发石家庄发泡板泡制品的这一问题而开发的,能有效地提高发泡管材的质量.</p><p style="text-indent:2em;"> 润滑剂分为外润滑剂和内润滑剂,外滑有利于脱模,对板材表面的光洁性有好处,外滑太少,挤出?区温度不易控制,易升温,这会导致合流芯温度高,板材中间出大泡、串泡、发黄等问题,板材表面也不光?;外滑多,析出会变得严重,表现在模具内的结构和板材表面外滑的析出,也会表现为某些个别现象在板面上不定期的来回移动。内滑有利于塑化和熔体的流动性,内滑不足板面难以控制厚度,表现为板材中间厚两边薄;内滑多,易出现合流芯温度高的现象?/p><p style="text-indent:2em;"> 分散不好会带来板材表面不光滑的现?/p><p style="text-indent:2em;"> 工艺温度控制问题:上面提到的四个问题属于根本性问题,是基础,是深层次问题。相对于上面四个问题,工艺温度控制则要直观得多,是表面问题,但温度控制不好,会诱发根本问题的出现。提高加工工艺温度,材料稳定时间会降低,出现稳定性问题;原有的润滑平衡会被打破,一般表现为外润滑不足,特别是后期外润滑,需提高外润滑添加量;温度提高也会导致熔体强度降低,发泡片材泡孔增大,泡孔数量减少,片材发脆易断裂;温度提高降低了熔体强度也会降低熔体粘度,粘度降低剪切分散能力降低,对分散能力不强的螺杆而言,有时会出现分散不均匀. </p>以上就是关于“石家庄发泡板”的简单介绍,我们公司还有PVC发泡板、石家庄康飞塑业有限公司等诸多相关产品,如果您比较感兴趣,可以跟我们联系获取更多详细资料?p><div>下一?<a href="297.html">PVC发泡板什么是pvc发泡?pvc结皮板制作工?/a></div> </p> <div class="clear"></div> <div class="tag">相关标签:<a href='/key.aspx?k=%b7%a2%c5%dd'>发泡</a>,<a href='/key.aspx?k=%c7%bf%b6%c8'>强度</a>,<a href='/key.aspx?k=%ce%c2%b6%c8'>温度</a>,<a 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