With the rapid development of injection molding industry, people have higher and higher requirements for the surface quality and dimensional accuracy of various plastic products, especially the plastic products used as pure structural parts in different engineering technologies. In order to meet their different physical and mechanical properties, the main requirements are dense structure, firm fusion High strength and low internal stress.

但在注射模試模過程中（zhōng），然後調整好注塑工藝的（de）參數後，製品還常會出現填充不足、內應力高、表麵流線等各種不同的（de）現象，這主要原因是（shì）模具的排氣有問（wèn）題。在模（mó）具進（jìn）行注塑加工的時候，模具（jù）內產生（shēng）的各（gè）種氣體主要有以下幾個來源和出處：有在型腔和澆注係統中存在的空氣;塑料原料（liào）中含有的水分在注射溫（wēn）度下蒸發而成的水蒸氣；高溫下塑（sù）料分解（jiě）所（suǒ）產生的（de）氣體（tǐ）；

But in the process of injection mold testing, and then adjust the parameters of injection molding process, the products often appear various phenomena, such as insufficient filling, high internal stress and surface streamline, which is mainly due to the problem of the exhaust of the mold. During the injection molding process of the mold, various gases generated in the mold mainly come from the following sources: there is air in the mold cavity and gating system; Water vapor formed by evaporation of water contained in plastic raw materials at injection temperature; Gas produced by plastic decomposition at high temperature;

在注塑的時候塑料中一些（xiē）添加劑揮發（fā）掉後或者一些熱固性塑料成形過程中交聯反應所生成的氣體。同時（shí）在要保（bǎo）證注射成形的過程中要完整的脫模進行，減少製品的成形缺陷，我們（men）再考慮如何提高（gāo）其質量的注（zhù）射加工工藝的同時，還必須重視其模具排出多餘氣體的係統的（de）設計。

During injection molding, the gas generated by cross-linking reaction after some additives in plastics volatilize or during the forming of thermosetting plastics. At the same time, in order to ensure the complete demoulding in the process of injection molding and reduce the forming defects of products, we must not only consider how to improve the injection processing technology of its quality, but also pay attention to the design of the system for discharging excess gas from its mold.

在注塑模具的過程（chéng）中，如模具排氣不良，型腔中的氣體受到壓縮將產生很大的（de）背壓，極大的阻礙了塑料熔體的正常快（kuài）速充模（mó），使注塑變得困難；同時會迫（pò）使注射時壓力（lì）不斷提高，保壓時間增加，成形周期延長，生產注塑件（jiàn）的時候效率也不停降低。有時候腐蝕性的氣體在型腔（qiāng）表麵形成積垢，降低了模具正常使用下的壽命。

In the process of injection mold, if the mold exhaust is poor and the gas in the mold cavity is compressed, it will produce a great back pressure, which greatly hinders the normal and rapid filling of plastic melt and makes injection molding difficult; At the same time, it will force the continuous increase of pressure during injection, the increase of pressure holding time, the extension of forming cycle, and the continuous reduction of efficiency in the production of injection molded parts. Sometimes corrosive gas forms scale on the surface of the cavity, which reduces the service life of the die under normal use.

在注（zhù）塑機塑料（liào）充模的過程中，為了將熔融的塑料的流動性保持在好的狀態，因此（cǐ）必須要提高在熔融塑料的溫度（dù）和注射壓（yā）力，但也因為這樣製品的（de）殘餘應力會隨之壓力而提高，產品四周的翹曲和塑料裂解（jiě）的（de）可能性也增加。

During the plastic filling process of the injection molding machine, in order to maintain the fluidity of the molten plastic in a good state, it is necessary to increase the temperature and injection pressure of the molten plastic, but also because the residual stress of the product will increase with the pressure, and the possibility of warpage and plastic cracking around the product will also increase.

比方模具的排氣正常情況下，注射速度可提高，充填和保壓可容易（yì）達到好的狀態，不需額外（wài）增加料筒和噴嘴的溫度。這樣製品的殘餘應力小，翹曲變形小（xiǎo）。注塑加工時候我們也要考慮如何排氣，好的排氣係統會提交塑料件的質（zhì）量。

For example, under normal conditions, the injection speed can be improved, and the filling and pressure holding can easily reach a good state without increasing the temperature of the barrel and nozzle. In this way, the residual stress of the product is small and the warpage deformation is small. During injection molding, we should also consider how to exhaust. A good exhaust system will submit the quality of plastic parts.