Do You Know the Blow Moulding Process?

The blow moulding process began to be used to produce low density polyethylene vials during World War II. In the late 1950s, with the birth of high-density polyethylene and the development of blow moulding machines, the blow moulding process was widely used. The volume of hollow containers can reach thousands of liters, and some production has adopted computer control. Plastics suitable for blow moulding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the obtained hollow containers are widely used as industrial packaging containers.

1. Understand the blow moulding process

Blow moulding is a manufacturing process that can obtain hollow plastic products. It is also used to form plastic containers, plastic buckets, bottles or other hollow shapes. The blow moulding process works on the principle that the feed to the extruder is the input to the blow moulding machine. The feed acts as molten plastic that will pass through the extruder head and form a parison. A parison is a tubular plastic sheet with a hole at one end through which compressed air can pass. The parison will pass through the die. The Cope and Drag parts of the die will be pressed against each other while compressed air will be passed through the air tube. By blowing high pressure air over a soft sheet (parison), it bends according to the inner shape of the mould and deposits on the inner surface of the mould to achieve the shape of the part. Through the cooling process, the product will regain its hardness.

The advantages of the blow moulding process are that in order to produce high thickness plastic parts, high blow moulding pressure is required, the production speed is fast, it can be recycled, and in the case of the blow moulding process, the tool cost is low. Through this blow moulding process, we can do: water bottles, plastic buckets, liquid containers, plastic cups, mugs, etc.

2. The difference between injection moulding and blow moulding

What is the difference between blow moulding and injection moulding? Blow moulding is used to produce hollow containers such as bottles. On the other hand, injection moulding is used to produce solid parts, such as solid plastic panels used in kitchens. What are the most common types of blow moulding processes? The most common types of blow moulding processes are continuous extrusion blow moulding and batch extrusion blow moulding. What are moulding and moulding types? Compression moulding is a manufacturing process by which hollow plastic products can be obtained. It is also used to form plastic containers, plastic buckets, bottles or other hollow shapes. There are two types of moulding. One is blow moulding and the other is injection moulding. What are the types of molds? These are the types of moulding: blow moulding, powder metallurgy plus sintering, compression moulding, extrusion moulding, injection moulding.