气体辅助注塑设备

气体辅助注塑技术原理

Principle of gas assisted injection molding technology

气体辅助注塑成型技术应用已有几十年的历史，其原理是高压氮气射入塑料产品内部，使塑料产品内部产生中空截面，利用高压氮气代替注塑机的高压注射及保压，使塑料产品内部向外部试压，是塑料产品表面紧靠模具表面，消除塑料产品的缩痕及塑料产品冷却所产生应力，使塑料产品不变形及表面缺陷，完成塑料产品注塑的全部过程。

Gas-assisted injection molding technology has been applied for decades. Its principle is that high-pressure nitrogen is injected into plastic products, so that hollow sections are generated inside plastic products. High-pressure nitrogen is used to replace the high-pressure injection and pressure preservation of injection molding machine, so that the internal pressure test of plastic products is external. Eliminate the shrinkage of plastic products and plastic products cooling stress, so that plastic products do not deformation and surface defects, complete the whole process of plastic products injection.

气体辅助注塑工艺图示：

第一阶段：塑料注塑：溶体进去型腔，遇到温度较低的模壁，形成一个较薄的凝固层。

第二阶段：气体射入：氮气进入熔融的塑料，推动中心未凝固的塑料进入尚未充满的型腔。

第三阶段：气体射入结束：气体继续推动塑料溶体流动直至到溶体充满整个型腔。

第四阶段：气体保压：在冷却过程中，气道中的气体压缩溶体，进行气体保压，确保制件的外观及强度。

第五阶段：气体排出：在模具开模前，气体从制件内部排出，气压降至到常压下。

气体辅助注塑优点：

1、简化产品模具繁琐设计，能够注塑成型壁厚较大产品；

2、减轻产品重量，节约原材料最高可达50%；

3、加快冷却速度，缩短产品生产周期；

4、可解决和消除产品表面缩痕问题；

5、减少产品内应力和翘曲变形，使产品尺寸更加稳定；

6、通过有气道的加强筋，提高产品强度而不增加产品重量；

7、较低模腔内压力，减少模具损耗；

8、降低注塑机锁模压力，延长注塑机寿命。

Advantages of gas assisted injection molding:

1, simplify the tedious design of product mold, can be injection molding products with larger wall thickness;

2. Reduce product weight and save up to 50% of raw materials;

3, accelerate the cooling speed, shorten the production cycle;

4, can solve and eliminate product surface shrinkage marks;

5, reduce the internal stress and warping deformation of the product, so that the product size is more stable;

6, through the airway reinforcement, improve the strength of the product without increasing the weight of the product;

7. Lower pressure in die cavity to reduce die loss;

8, reduce the injection molding machine clamping pressure, prolong the life of the injection molding machine.