Compression molding

Compression molding
In this process, premeasured volume of powder, or a preformed part, is placed directly in a heated mold cavity and is formed by pressure with a punch or the other half of the mold. Compression molding is thus similar to a forging operation with the same problem of flash formation and the need for its removal.
This process is used mainly for thermosets, with the original material in a partially polymerized state. Cross-linking is then completed in the heated mold under pressure and with curing times ranging from 0.5 to 5 minutes, depending on the material, part geometry and its thickness-the greater the thickness, the longer the curing time.
Because of their relative simplicity, mold costs in compression molding are generally lower than in injection molding. Three types of compression molds are available: flash, positive, and semi-positive, as shown in Fig. Typical parts made by this process are knobs, handles, fittings, and housings. Fiber-reinforced materials may also be formed by compression molding.

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压塑成型
在这个过程中,一个接一个的粉末,或一个中立的一部分,是直接放在一个激烈的模具型腔压力,是由穿孔或另一半的塑造。压塑成型是如此相似锻造操作有同样问题的形成和需要闪光灯的去除。
这个过程是主要用于热固性塑料,与原辅材料在部分聚合状态。然后填写交的压力下加热模和固化时间从0.5 ~ 5分钟,这取决于材料及其厚度,部分几何厚度越大,越长越固化时间。
因为他们的相对简单、模具成本压缩成型通常低于注塑成型。三种类型的压缩模具可供选择:闪光,阳性的、半阳性的,如图。典型的部分由该工艺、设备、把手、把手、允许值。结论材料也可以形成的压缩成型。

compression molding 英 [kəmˈpreʃən ˈməuldiŋ] 美 [kəmˈprɛʃən ˈmoldɪŋ] [释义] 平板硫化（法），压缩模塑（法），压模（法）

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