Various Types of Blow Molding Process

The water bottles available today are possible due to the process of Blow Molding. Blow molding is the process where deep plastic materials are manufactured. It helps to create hollow plastic materials. For example, a water bottle, it is shaped in such a manner that it can hold water and this is possible because of this process. There are many products made out this process, therefore it is considered as a very useful and efficient process.

Every industry requires plastic hollow products somewhere or the other. Huge oil tanks, paint drums, spot sprayers, dock cushions, floats, etc. are few industrial products that are made from this process. Let’s see the various blow molding process available today:

Extrusion Blow Molding: It is the simplest type of molding and requires a small capital investment compared to all other types. In this process, a hot tube of plastic material is dropped into a water cooled mold through the extruder. Then air is injected once the mold is closed through the neck of the container. After this the plastic material blows up and reaches the walls of the container thus gaining the shape of the container.

On an average some extrusion machines can produce 300 to 350 bottles per hour. It can make containers of various sizes and shapes with less capital and involves very less time. The main advantages of this process are low cost and mass production.

Injection Blow Molding: The melted plastic is injected into the mold through the extruder. Then the mold produces a preform parison which looks like a test tube with a screw on top. This preform is then transferred on a core rod and is then placed into a cold aluminum mold. Air is then injected in till the preform takes the shape of the cavity.

This process is least used among all the blow molding processes. It is mainly used to produce hollow glasses and various plastic products especially small products.

Stretch Blow Molding: In this process, the preform is formed through the injection process. The preforms are heated and then blown using high temperatures into bottles. It is then stretched. The main materials produced using these processes are bottles and jars. It was mainly started in the year 1970 to package detergent and has grown since then. Now it is mainly used to make carbonated beverage bottles. The main advantage of this process is that it can be stretched in all directions and help in shaping the material more accurately.

Spin Trimming: Many products after its manufacturing have excess material which is unnecessary. This excess material is then trimmed off using some kind of blade in this process. The excess material is not wasted; it is then recycled and used for various other purposes.

After knowing the various types of blow molding, it’s easier for you to judge which type of blow molding machine is required for your industry. Apart from this, one get a lot of terminology and knowledge pertaining to this industry by means of books and internet.

G. S. Hydraulics have a dense network of suppliers, distributors and other traders across the world and within India. They are a leading company manufacturing variety of spare parts, accessories of injection molded machines, injection molding machines, blow molding machines, components and accessories of multiple dimensions and styles.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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