With the wide application of plastic bottle packaging in our daily life, plastic bottle caps are becoming more and more essential in many fields like beverage&food, cosmetic industry, chemical industry, medicine etc. In this passage, we are going to talk about different types of plastic and different molding processes for making plastic bottle caps.

4 Types of Plastic used to Produce Bottle Caps

Most plastic bottle caps are made from the four types of recyclable plastic as follows:

l PET (polyethylene terephthalate): low price, high transparency

l HDPE (high-density polyethylene): ESCR (environmental stress cracking resistance), easy to process

l LDPE (low-density polyethylene): flexible, good impact strength

l PP (polypropylene): hard, rugged and durable

2 Types of Molding Processes: Injection Molding and Compression Molding

Generally, there are two types of molding processes to produce plastic bottle caps.

n Injection Molding

Injection Molding is a manufacturing process in which shaping the plastic by injecting heated material into a mold. Most plastic bottle caps are made by Injection molding process, which makes possible mass production of intricate, high performance, tight tolerance parts with very little secondary labor and minimal waste.

n Compression Molding

Compression Molding is one of the most widely used plastic molding manufacturing techniques. Compared to injection molding, compression molding is economical and efficient solution. It is a molding process in which preheated plastic material is poured into mold cavity and compressed under pressure to form the final shape of the plastic product.

28mm 30mm 38mm 48mm 55mm cap