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It preform. 3. Preform inflation and cooling

 It is the leading plastic manufacturing
process because of wide range of plastic resin that can be blow molded.  The most famous method for the production of
empty or hollow parts out of parts vary in sizes, from very small to very large
parts. The common example of blow molding is plastic bottles but other object
for instance automotive components, medical equipment and toys etc.

PRODUCTION OF THERMOPLASTIC RESIN:

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Blow molding
products are formed from thermoplastic resin. Names are mentioned below. 

1.    
 High density polyethylene

2.    
Medium and low density polyethylene

3.    
Polyethylene terephthalate

4.    
Polypropylene

5.    
 Polyvinyl chloride

6.    
 Thermoplastic Elastomers

7.    
 Polystyrene

8.    
 Polycarbonate

9.    
 Fluoropolymers

10.                       
 Polyimide

 

 

 

TYPES
OF BLOW MOLDING:

It is basically classified into three
main types that are  extrusion blow
molding, injection blow molding and injection stretch blow molding, each of
three shares four common points of manufacturing.

1.    
Melting of resin.

2.    
Formation of preform.

3.    
Preform inflation and cooling in blow
molding

4.    
Ejection from the blow mold.

EXTRUSION
BLOW MOLDING:

Extrusion blow molding is further of
two types, continuous or intermittent. In former the preform is subjected into
mold and each form will be cut off as the formation is done, while in later
blow molding process, it ejects each new plastic from the metal mold when it is
cooled and parison is fed into mold only after the preceding parison is
expelled out.

INJECTION
BLOW MOLDING:

Blow is basically is used in this
process. Parison is feed into a split mold cavity around the rod. Final product
is formed when core rod transfer the parison to blow mold machine. Product is
then taken out from machine. It is cheaper than extrusion blow molding.

INJECTION
STRECH BLOW MOLDING:

It is the combination of first two
types. The plastic is molded first to create bottle neck, as the temperature
get decrease it is dump into stretch blow molding machine, here it is reheated
and then it is forced into a plastic bottle.

ADVANTAGES
OF BLOW MOLDING:

v It brings variation in the product.

v It is economical.

v It has are many alternative methods of
manufacturing.

v High production rate.

                        DISADVANTAGE
OF BLOW MOLDING:

v It has bad effects on environment.

v It is largely based on petro chemicals.

v It has less uses.

v It requires process and material precision
that creates waste.

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