plastic molders and plastic mouldings

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SATURDAY, FEBRUARY 12, 2011

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

www.deekayengg.com

SUBSCRIBE "PLASTIC MOLDERS AND MOLDINGS"WWW.DEEKAY

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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 forinjection 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 byregrinding the wastage and then re process the same to plastic moulded

part.

.

STRECH BLOW MOULDINGThe 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 stil l 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 MachineThis 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 MOULDSFROM 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




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