塑料包覆成型是一种将两种不同类型的塑料组合在一起以形成单个零件的制造工艺。通常，塑料二次成型涉及使用硬塑料覆盖着通常经过橡胶处理的较软塑料。或者，它可用于将两个不同颜色的硬塑料粘合在一起。总体而言，这是一个将具有不同特性的各种材料组合成单个成型部件的过程。
二次成型工艺
二次成型工艺通过使用两个独立的注塑模具完成。首先，基材或第一次注射，通常是硬质塑料，是用第一个注射工具制成的。然后将刚性部件取出并放入单独的注塑模具中，在第一个零件上模制第二次注射或包覆成型。在大多数情况下，机械粘合设计在零件中，以使包覆成型粘附在基材上。这些机械粘合是通过在基材（第一次注射）中形成区域而形成的，在二次成型过程中，第二次注射（包覆成型）会流入这些区域。塑料二次成型的好处
包覆成型是一种增值技术，可为零件提供额外的功能和装饰。它通常用于其耐用性和坚固耐用产品的创造，但可用于装饰，因为它增加了美学和功能。塑料包覆成型可以使产品具有柔软的橡胶化感觉，与硬塑料相比，其处理起来更加舒适。它还可以平滑和圆润坚硬的塑料边缘。包覆成型的主要功能优势是其坚固和防滑的表面，可确保产品在极端环境中的安全。其他好处包括减少不必要的振动或噪音，增强对液体的保护，以及额外的品牌识别机会。塑料二次成型的航空航天应用
As a technology utilized throughout a variety of industries including aerospace, plastic over-molding is an excellent option for customers who are interested in soft-touch handles, grips, etc., or multi-colored buttons, switches, or knobs for their products. Additionally, this process is a great option for sealing or gaskets on parts. Over-molding a gasket on a plastic substrate bonds the gasket material to the substrate, which helps to prevent moisture ingression, as opposed to using a rubber or die-cut gasket that is pressed or held together by screws. Common applications for over-molding within the aerospace industry include aircraft seating, lavatories, stowage bin latches, handles, and user interface switches. Instead of having to create two different parts that then require additional assembly to fasten them together, over-molding allows for multiple parts to be formed into a single part at once. Since the second shot is molded over the first substrate, the bond created between the two is much stronger and more durable, as well as results in a clean design. The key advantages that aerospace applications take away from over-molding include:- 减轻体重
- 提高强度和耐用性
- 增强型工业设计
- 无需额外的制造和装配步骤
- 缩短制造和装配时间
