You may be confused about the different types of Plastic Screw Caps. Here is an overview. What is the most common type? Why is it used? How can you make it work for you? Read on to learn about its benefits. Then, choose the correct one for your product! Here are some examples:

These caps are usually white in color. They are able to seal and keep your products airtight. They feature an EPDM gasket and a 3/4 inch NPT microporous vent opening. They can also mount on bung holes with a coarse thread. So, you can get the right screw cap for your packaging needs. Listed below are some advantages of using Plastic Screw Caps:

The top of a Plastic Screw Cap consists of two parts - a top (11) and a skirt (12). The top has a form-locking surface (16) on the inner surface. This form-locking surface is shaped to prevent the cap from unscrewing. The skirt has an external surface that is cylindrical, and the outer surface is smooth and curved in a single plane. Its circumferential lower edge (17) defines a relatively thin uniform wall. The external metal sheath (20) rolls over the skirt edge (17).

The mould tool for the cap of the invention is illustrated schematically in Fig. 4. The inner mould part is a tubular shape that defines the cavity 31. It is usually not equipped with injection ports. The mould tool is closed during this process. After the cap is moulded, the outer mould part 35 is withdrawn from the inner mould part. Once the cap is moulded, the inner mould part rotates relative to the outer mould part.

A Screw Cap is a mechanical device that attaches to the finish of the container with threads or lugs. The closure must meet various requirements: cost-effective, effective seal, and compatibility with the contents. The screw cap must also be easily opened by a consumer, and be reclosable. Also, a Screw Cap must meet all product laws, including the requirements for child-resistant packaging. Many Screw Caps feature a tamper-evident band.

Another type of Plastic Screw Cap has a circular array of external recesses that extend circumferentially. This structure helps reduce differential cooling and internal stresses. The recesses are usually 25-30 deg circumferentially and narrow enough at the mouth to prevent inward distortion. The gate well 14 and the grooves 18 are also narrow. A composite cap may have several layers of material, and can be injection moulded or molded.