The manufacturing process for plastic end caps can be broadly categorized into several types.

There are two primary manufacturing processes for plastic caps: compression molding and injection molding. These two methods differ significantly in many respects;

therefore, when making a selection, it is crucial to base your choice on your specific requirements. Furthermore, several parameters influence the final dimensions of the bottle caps-factors that warrant careful attention. In the following sections, we will introduce the general manufacturing processes for plastic caps, as well as the specific compression molding parameters that affect cap dimensions. Let's take a closer look.

What are the manufacturing processes for plastic caps?
Generally speaking, the manufacturing processes can be broadly categorized into two types: the compression molding process and the injection molding process. We outline them below:

1. The Compression Molding Process for Caps
A material feeder draws the pre-mixed raw material into the barrel of the compression molding machine. Inside the barrel, the material is heated to a semi-molten, plasticized state before being quantitatively extruded into the mold cavity. The upper and lower mold halves then close to compress the material; after cooling and setting, the cap is demolded. Finally, the cap undergoes ring-cutting and liner insertion to complete the production process.

2. The Injection Molding Process for Caps
A material feeder draws the pre-mixed raw material into the barrel of the injection molding machine. Inside the barrel, the material is heated to a fully molten, plasticized state before being injected into the mold cavity. Once inside the cavity, the material cools and sets, after which the cap is demolded. Finally, the cap undergoes ring-cutting and liner insertion to complete the production process.