2 擠出方法中使用的設備是一種自製的兩階段擠出機，以排除擠出廢料中產生的氣體，也可用的排氣擠出機。為了排除廢物中的碎屑，必須在擠出機的放電端使用80-120的網格屏幕。

使用回收材料以及由於塑料加工的熱老化而對PP袋的性能的影響對性能有很大的影響，尤其是在兩個甚至更多的熱過程後的回收“”袋的回收，再加上紫外線衰減之前的回收，性能會顯著減少。

由於PP塑料多次熱處理和熱老化以及長期使用紫外線輻射老化，因此使用再生材料在調整繪圖過程中的使用，從而導致PP再生材料熔體熔體指數隨處理和增加的數量而增加。因此，在新材料中添加了大量再生材料後，與新材料相比，應將擠出機溫度，頭部溫度和拉伸溫度向下調節，應通過測試舊混合材料的熔體指數來確定調整。

 另一方面，由於回收材料已經進行了幾次處理，因此分子量減小，並且存在大量短分子鏈，並且已將其拉伸和定向多次。因此，在生產過程中，與同一全新的材料相比，還應向下調整拉伸乘數。通常，新材料的拉伸因子為4-5倍，而再生材料的3-4倍，增加40％。同樣，由於回收材料的熔體指數的增加，粘度降低，擠壓速率增加，因此在相同的螺絲速度和溫度條件下，應稍微加速導線的牽引力。在新原材料和舊原材料的混合中，值得注意的是，混合物應該是均勻的。同時，應盡可能匹配具有相似熔體指數的原材料。熔體指數的差異很大，熔體溫度的差異很大。在塑料擠出時，兩種原材料不能同時塑料，這將嚴重影響擠出和拉伸的速度，從而導致高廢率甚至無法生產。

博客上一篇：BOPP電影高性能開發方向下一篇：opp袋是什麼樣的塑料袋，opp袋和PE袋和PP袋相關的帖子之間的區別... PP編織包的生產過程PP機織袋的共同特徵是什麼？

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3抗衰老的編織袋和抗衰老的編織袋……在中國江蘇省Shuyang經濟發展區的Facebook 9號，Facebook No.9，Facebook No.9，像我們這樣的覆蓋式編織袋的過程。

js@bagkingchina.com sandywang@bagkingchina.com ulawang@bagkingchina.com +86-0527-8337 6699 6699信息家庭產品有關美國博客的信息家庭產品與我們聯繫我們的產品PP Woven Bag woven bag polaft poly kraft polaft pp pp woven farbric rolbric rolber lod copter toce to coperth fible coperth fible copyrt firest fible copyrt firest 2222222222

4 The use of recycled material on the adjustment of the drawing process due to pp plastic many times thermal processing and thermal aging and long-term use of ultraviolet radiation aging, resulting in pp recycled material melt index with the increasing number of processing and rise. Therefore, after a large amount of recycled material has been added to the new material, the extruder temperature, head temperature and stretching temperature should be adjusted downwards in comparison to the new material, and the adjustment should be determined by testing the melt index of the old and new mixed materials.

 On the other hand, as the recycled material has been processed several times, the molecular weight is reduced and there are a large number of short molecular chains present, and it has been stretched and oriented several times. Therefore, in the production process, the stretching multiplier should also be adjusted downwards compared to the same brand new material. Generally, the stretching factor is 4 - 5 times for new material and 3 - 4 times for recycled material with the addition of 40%. Also due to the increase in melt index of recycled material, the viscosity is reduced, the extrusion rate is increased, so in the same screw speed and temperature conditions, the traction speed of the wire drawing should be slightly accelerated. In the mixing of new and old raw materials, it is worth noting that the mixture should be homogeneous; at the same time, raw materials with similar melt indices should be selected as far as possible to match. The difference in melt index is large, and the difference in melt temperature is large. In plasticising extrusion, the two raw materials cannot be plasticised at the same time, which will seriously affect the speed of extrusion and stretching, resulting in high scrap rate or even inability to produce.