Tuesday, March 29, 2011



Blow molding (also known as blow moulding or blow forming) is a manufacturing process by which hollow plastic parts are formed. In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and stretch blow molding. The blow molding process begins with melting down the plastic and forming it into a parison or preform. The parison is a tube-like piece of plastic with a hole in one end in which compressed air can pass through.

The parison is then clamped into a mold and air is pumped into it. The air pressure then pushes the plastic out to match the mold. Once the plastic has cooled and hardened the mold opens up and the part is ejected.


There are two types of blow molding – Extrusion & Injection blow molding. In Extrusion Blow Molding, plastic resin is heated up to melt and extruded into a tubular shape called Parison. This Parison is then trapped inside two halves of the required mold and blown by air to the shape of mold. In Injection Blow molding, first the material is injected to form a preform and then it is blown to the shape. Extrusion Blow molding is used to produce all types of drums, cans, bottles etc. and injection blow molding is used to produce bottles.

Continuous Type Blow Moulding:

In continuous blow molding the Parison – tubular molten raw material – is extruded continuously and the mold moves sidewards after receiving the Parison. The blowing will be done in the blowing station and the blown containers ejected. The mold will again move towards the Parison and next
cycle starts.

Intermittent Type Blow Molding:

In intermittent blow molding the molten material is stored in a chamber called accumulator and Parison is ejected intermittently during the start of each cycle. Hence these machines are known as accumulator type blow molding machines. In Accumulator machines Parison is ejected intermittently at the starting of each cycle. During the blowing time the molten material processed by extruder is stored in the accumulator chamber on the die head.

Injection Blow Molding:

In normal injection Blow molding process, the Preform made by injection moulding is directly blown to the required shape of mold. The injection process allows generating better neck formation to the container.

Injection Stretch Blow Molding:

In normal injection stretch Blow molding process, the Preform made by injection moulding is first stretched along the axis to orient the structure and then blown to the required shape of mould. This allows creating transparent containers with very low wall thickness and better strength.

Single Stage Injection Blow Molding:

In single stage molding, the preform is made and immediately blown to shape in the same machine. The normal injection blow molding is done by this process. The stretch blow molding also done in single stage process.

Two Stage Injection Blow Molding:

In two stage process, first the preform made like any injection mold process. The ready preform then re-heated, stretched and blown to the required shape. Here the preform making and blow molding are done in two different machines. This process is used normally for stretch blow molding.

Tuesday, June 15, 2010

Company Profile


 An Overview

A professionally managed company, BLOW ENGINEERING is one of India's distinguished manufacturers and exporters of Automatic Plastic Blow Molding Machine, Injection Blow Molding Machine, Multilayer Blow Molding Machine, Injection Molding Machine(Vertical/Horizontal Screw Type) , Pet Blow Machine and other plastic processing machines. 

Our products find application in different sectors of the industry such as electrical and electronics, auto-parts, sanitary parts and many more.Since its inception in the year 1988, the company has grown by leaps and bounds in its sphere of operation and emerged as an undisputed leader. 

Our total commitment to quality has witnessed our success in the local as well as overseas markets. The products are regularly exported to the markets of Saudi Arabia, Kenya, Dubai, Africa and Nigeria. Few of our major clients are Kisan Group of Companies and Nitiraj Plastic Pvt. Ltd. We have got into business agreement, according to which we would further supply our products to Rajasthan IIT.

Our Values

Blow Engineering is based on the following values:- 

Adhere to ethical norms in all dealings with employees, customers and suppliers
Provide value for money to customers through quality products and services
Treat people with respect and concern
Discharge responsibilities to various sections of society and preserve the environment.

Product Range

Blow Engineering is engaged in the manufacture and export of the following:- 

- Automatic  Plastic Blow Moulding Machine. (range: 5 ml. to 60 Ltrs.)

- Injection Blow Moulding Machine. 

- Multi layer Blow Molding Machine.

- Injection Molding Machine (Vertical Screw Type/Horizontal Screw Type).

- Pet Blow Machine.

- Plastic Scrap Grinder.

- Other plastic Processing Machines.



Blow Engineering operates over a quality management system which complies to the established international standards. We have a team of quality control officers to ensure that quality is maintained at every level of production. All our products are tested on the parameters of their tensile strength, durability, resistance to heat, etc. The company has an in-house testing laboratory that checks all the products for detecting any kind of production flaws or discrepancies.  


Our manufacturing base is well equipped with advanced technology and sophisticated machines. This hi-tech facility at Blow Engineering is backed by a team comprising of engineers, scientists, technocrats, etc. Due to their vast experience in the industry, they are aware of all kinds of precautions and parameters that have to be kept in mind during the production process.

To further help them keep abreast with latest advancements, our management conducts training sessions regularly.

Manufacturer & Exporter of Plastic Processing Mach: Introduction of Plastic Injection Blow Molding Machine.

Manufacturer & Exporter of Plastic Processing Mach: Introduction of Plastic Injection Blow Molding Machine.

Introduction of Plastic Injection Blow Molding Machine.


The injection molding phase consists of injection molding a thermoplastic material into a hollow, tube-shaped article called a preform. The preform is transferred on a metal shank, called the core rod, into a blow mold. 

The process of injection blow molding (IBM) is used for the production of hollow glass and plastic objects in large quantities. In the IBM process, the polymer is injection molded onto a core pin; then the core pin is rotated to a blow molding station to be inflated and cooled. This is the least-used of the three blow molding processes, and is typically used to make small medical and single serve bottles. The process is divided into three steps: injection, blowing and ejection.

The injection blow molding machine is based on an extruder barrel and screw assembly which melts the polymer. The molten polymer is fed into a manifold where it is injected through nozzles into a hollow, heated preform mold. The preform mold forms the external shape and is clamped around a mandrel (the core rod) which forms the internal shape of the preform. The preform consists of a fully formed bottle/jar neck with a thick tube of polymer attached, which will form the body.

The preform mold opens and the core rod is rotated and clamped into the hollow, chilled blow mold. The core rod opens and allows compressed air into the preform, which inflates it to the finished article shape.

After a cooling period the blow mold opens and the core rod is rotated to the ejection position. The finished article is stripped off the core rod and leak-tested prior to packing. The preform and blow mold can have many cavities, typically three to sixteen depending on the article size and the required output. There are three sets of core rods, which allow concurrent preform injection, blow molding and ejection.

 Each thermoplastic resin has its own set of tooling design parameters. Hot melt density, shrink factors, stretch ratios, blow pressure, venting criteria, and surface area of the tooling must all be known prior to designing any tooling. 

for more info mail us at : response@blowengg.com

or go to http://www.blowengg.com