Process Of Blow Moulding - Awanti Polymoulds

The invent of PET in the era of 70s, saw the first plastic bottle which was capable to be utilised for storing water. Plastic later got utilised on a large scale for storing water due to the bottles being light weight and being less prone to be cracked or broken. Now days in the recent times around the year 2015 this plastic which was utilised to bottle drinking water, due to various regulatory changes made by many governments, was changed and made much thinner.

We mostly use pET to make bottles for drinking water because of one major advantage it possesses- it is recyclable and can be easily manufactured hence it is environment friendly and cost effective.

We basically use injection moulding to manufacture solid or strong components while we use blow moulding to make plastic products with hollow areas, such as bottles, containers, etc.

The Blow Moulding Process -

During the blow moulding process, we shape the raw plastic material into a hollow tube with one open end called a parison. The parison is pressed into a cooled metal mould and compressed air is forced into the parison. When the formed plastic cools and hardens, the metal mould opens and expels spred the product.

There are three types of blow moulding processes:

1. Injection Blow Moulding

In injection blow moulding, a blow or core rod is used throughout the process. First a parison is injected into a split mould cavity around the rod. The parison that is formed looks similar to a   test tube. The core rod transfers the parison to the blow mould machine where forced air creates the final shape. The rod then transfers and extrudes the finished product from the machine.

2. Extrusion Blow Moulding

Extrusion blow moulding can be continuous or intermittent. In continuous extrusion blow moulding, a parison will be constantly fed into the mould and we will cut each form off with a blade as it forms. Intermittent extrusion blow moulding expels each new plastic from the metal mould when it is cooled and they feed the parison into the mould only after we expel the preceding parison.

This blow moulds are much less expensive than injection blow moulds and can be produced in a much shorter period of time. Extrusion blow moulding is appropriate for smaller runs. Cost savings on tooling and shorter production time is an advantage while disadvantages usually include lesser control of wall thickness and greater amount of scrap material.

3. Injection Stretch Blow Moulding

This kind of blow moulding combines the injection moulding and blow moulding processes. To create a threaded bottleneck plastic is first moulded into a solid preform.

Once the preform cools we feed it into a stretch blow mould machine. The preform is then reheated using an infrared heater and blown into a plastic bottle with forced compressed air.

What Moulding Processes Does Your Product Require?

What type of manufacturing process is right for your next project? We have experienced engineers have decades of experience and understand what type of material and mould is right for you. Contact us to discuss your new plastic design or product idea today, and we will walk you through the manufacturing process that is best for your project needs.

Major Players in the Plastic Bottle Industry

Mineral water or cold drinks or soft drinks, many brands are major players in the plastic bottled beverage industry. Some major players in bottled water industry are Bisleri, Bailey, Kinley, Aquafina and Manikchand. Awanti Polymoulds are one of the best Bottle mould manufacturers in India and also are one of the best blowing machine manufacturers in India we are best representative for making great plastic bottle moulds in India. We have the privilege of working with all these major brands