在注塑加工工業的迅速發展的當代，使人們（men）對（duì）各種塑料製品的表麵（miàn）的質量要求和尺寸（cùn）的精度要求越來越高，尤其是在（zài）不同的工程（chéng）技術中作為純粹（cuì）的（de）結構零件（jiàn）使用的塑料製品，為滿足其（qí）使用的不同的（de）物理（lǐ）性能和（hé）力學性能，主要的要求還是要（yào）製品組織致密、熔接牢固（gù）、強度高、內應力小。但在（zài）注射模試模（mó）過程（chéng）中（zhōng），然後調整好（hǎo）注（zhù）塑工藝的參數（shù）後，製品還常會出現填充不足、內應（yīng）力高、表麵（miàn）流（liú）線等各種不同的現（xiàn）象，這主要原因（yīn）是模具的排氣有問題。在（zài）模具進行注塑（sù）加工的時候（hòu），模（mó）具內（nèi）產生（shēng）的各種氣體主要有以（yǐ）下幾個來源和出處：有在型腔和澆注係統（tǒng）中存在的空氣（qì）;塑料原料中含有的水分在注射溫度下蒸發而成（chéng）的水蒸氣（qì）；高溫下塑料分解所產生的氣體；
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. 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（sù）的時候塑料中一些（xiē）添加劑揮（huī）發掉後或者一些熱固（gù）性塑料（liào）成形過程中交聯反應所生成的氣體。同時在要保證注射成形的（de）過程中要完整的脫模進行，減少製品的成（chéng）形缺陷，我們再考慮如何提高其質量的注射加工工藝的同時，還一定（dìng）重視其模具排出多（duō）餘氣體的係統（tǒng）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 should 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（zài）注塑模具的過程中，如模具排氣不好，型腔中的氣體受到壓縮將產生很大的背壓，大（dà）的阻礙了塑料熔體的正常快速充模，使注塑變得（dé）困難；同時會迫使注（zhù）射（shè）時壓力不斷提高，保壓時間增加，成形周期延（yán）長，生產注塑件（jiàn）的（de）時候效（xiào）率也不停（tíng）降低。有時候腐蝕性的氣體在型腔（qiāng）表麵形成積垢，降（jiàng）低了模具正（zhèng）常使用下的壽命。
In the process of injection mold, if the mold exhaust is not good, the gas in the mold cavity will be compressed, which will produce a great back pressure, which greatly hinders the normal and rapid filling of plastic melt, making 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持在好的狀態，因此（cǐ）必須要（yào）提高在熔融塑料的溫度和注射（shè）壓力，但也因為這樣（yàng）製品的殘（cán）餘應力會隨之壓力而提高，產品四周的翹曲和塑料裂解的可能性也（yě）增加。比方模（mó）具的排氣正常情況下，注射速度可提高，充填和保壓可容易達（dá）到好的狀態（tài），不需額外增加料筒和噴嘴的溫度。這樣製品的殘餘應力小，翹曲變（biàn）形小。注塑（sù）加工（gōng）時候我（wǒ）們也要考慮如何排氣，好的排（pái）氣係統會提交（jiāo）塑（sù）料件的質量。
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. 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.
