Mobile phone shell or other plastic products, the internal screw column thread is injection, or?. After injection processing?
Like the battery car, the thread above is the post processing, those big thread bottle cap, such are injection molding out
High grade mobile phone, screw hole is in the beer shell, directly on the mold set of beer out. Ordinary mobile phones use a self tapping screw, that is to say, when the beer comes out, it is a light blind hole and has no thread.
The internal screw column of a mobile phone shell and other products has smaller diameter, and the screw column thread of the utility model is not molded out by injection, but is processed in the late stage.
