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（guò）程中，然後調整好注塑工藝的參數（shù）後，製品還（hái）常會出現填充不足、內（nèi）應力高、表麵流線（xiàn）等各種不同的現象，這主要原因是模具的排氣（qì）有（yǒu）問題。在模具進（jìn）行（háng）注塑加工的時候，模具內產生的（de）各種氣體主要有以下幾個來源和出處：有在（zài）型腔和澆注係統中存在的空氣;塑料原料中含有的水分在注（zhù）射溫度下蒸發而成的水蒸氣；高溫下塑（sù）料分解所產生的氣體；

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（sù）料中一些添加劑揮發掉後或（huò）者一些熱固性塑料（liào）成形過（guò）程中交聯反（fǎn）應所生成的氣（qì）體。同（tóng）時在要保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，我們再考慮如何（hé）提（tí）高其質量的注射加工工藝的同時，還（hái）必須重視其模具排出多餘氣體的係統的設計。

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.

在注塑模具的過程中，如模具排氣不良，型腔中的氣體受到壓縮將產生很大的背壓，極大的阻礙了塑料熔體的正常快速充模，使注塑變得困難；同（tóng）時會迫使注（zhù）射時壓力（lì）不斷提高，保壓時間（jiān）增加，成形周期延長，生產注塑件的時（shí）候效率也不停降低。有時候腐（fǔ）蝕性的（de）氣體在型（xíng）腔表麵形成積垢，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.

在注塑機塑料充模的過程中，為了將（jiāng）熔融的塑料的流動性保（bǎo）持在好的狀態，因此必須要（yào）提高在熔融塑（sù）料的溫度和注射壓力，但也因為這樣製品的殘餘應力會（huì）隨之壓力而提（tí）高（gāo），產品四周的翹曲和塑料裂解的可能性也增加。

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（jù）的（de）排（pái）氣正（zhèng）常情（qíng）況下，注射速度可提高，充（chōng）填和保壓可容易達到好的狀態，不（bú）需額外增加料筒和噴嘴（zuǐ）的溫度。這樣（yàng）製品的殘餘（yú）應力小，翹曲變形小。注塑加工時候我們也要考慮如何（hé）排氣，好的（de）排氣係統會提交塑料件的質量。

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.