Blow moulding and types of Blow moulding process.

What is Blow Moulding  ?

Definition "PLASTIC PROCESSING "

In most simple words     "Blow moulding" is a process of producing hollow plastic parts" using thermo plastic granuals.

Basic "PLASTIC BLOW MOULDING" Process

The basic process is common to all variations of the Blow moulding method , which consists of  3 STAGES

Melting and Plasticising  "machine job"

– This is accomplished with either extrusion and/or injection moulding

machine to produce the melt.

.

Plastic Formation "shapeing the plastic as desired" by "Plastic blow moulds"

Through screw head and Plastic mould  die or in an Injection blow mould.

Blowing and Moulding

An auxiliary compressor provides air pressure and a clamp unit, which

closes over a Split mould (TWO HALFS OF PLASTIC MOULD) that is operated with an hydraulic system.

The first step involves the production of a hot tube, known as a parison, a term derived from the

glass industry. This may be produced, as indicated, by one of two methods, extrusion or injection.

In the injection case it is referred to as preform.used for pet strech blow moulding"

The heated parison or preform is placed between two halves of the blowing mould, which closes

and clamps around it. The heated tube is blown against the cavity wall and the molten plastic or

resin takes the shape of the mould while being cooled.

Ater cooling stage the part is ejected from the mould. In the case of an extruded part it is necessary to

remove the   fash (excess plastic around the part) for further finishing.

FOR ALL KINDS OF PLASTIC BLOW MOULDS ,PET STRECH BLOW MOULDS, HDPE BLOW MOULDS,LDPE BLOW MOULDS AND BLOW MOULDING JOBS YOU CAN CONTACT US 

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The company specilise in manufacturing if  Blow moulds as well as plastic injection moulds and plastic  mouldings

Types of Blow Moulding

As indicated earlier blow moulding may use either extrusion or injection methods for processing.

A Brief is summarised below 

Injection Blow Moulding

Injection blow moulding produces a parison with bottle neck and threads already formed to final

dimensions. This process is used primarily for small pharmaceutical and personal product containers.

The economics for such containers dictate multiple (up to ten) cavities - one set each for injection moulding and blow moulding.

There is Best part of this process is no plastic waste or trim generated with the latest   Injection blow moulding the waste of disshaped bottle can be used by regrinding the wastage and  then re process the same to plastic moulded part.

                                                                                               

.

STRECH BLOW MOULDING

The injection moulding process produces a moulded    parison in shape of a tube  called a preform.

This method is preferred over extrusion blow moulding for making small parts that require high production volumes and closer quality dimensions. Injection blow moulding consists of injecting a thermoplastic material into a cavity and around a core rod producing a hollow tube like shape (preform).for the blowing process

The moulded preform still on the core rod is transferred to the blow mould. The mould is clamped  around the preform and air is blown to shape of the cavity. The preform is injected onto a support pin or core which forms a neck with threads to their required dimensions.The preform is then blown against the cavity wall to its final shape

Reciprocating Screw Machine

This is a combination of an injection and a plasticising unit in which an extrusion device with a

reciprocating screw is used to plasticise the material. Injection of material into a mould can take

place by direct extrusion into the mould, or by using the reciprocating screw as an injection plunger,

or by a combination of the two. When the screw serves as an injection plunger, this unit acts as a

holding, measuring, and injection chamber

Advantages and Disadvantages of Injection Blow Moulding

 Advantages of injection blow moulding are:

1.No scrap or   ash to trim and reclaim

     2. High quality neck fi nish and details

     3.No process weight variation

4. Offers lowest part cost for high-volume bottles 37 grams (12 oz) or less.

 DEE KAY ENGG IS IN MANUFACTURING AND EXPORTS OF PLASTIC BLOW MOULDS FROM LAST 15 YEARS AND HAVE AN EXPERTISE IN MANUFACTURING BLOW MOULD. THE COMPANY SET UP INCLUDES ALL THE SERVICES BEGINING FROM DESIGNING A COMPONENT ,MAKING THE DESIRE MOULD AND THEN PRODUCTION IF REQUIRED BY CUSTOMER .WE PROVIDE A BLOW MOULD IN JUST 7 DAYS. 

PLASTIC BLOW MOULDING  AND  BLOW  MOULD MANUFACTURING COMPANY

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