BLOW MOULDING PROCESS

1
PPT ON
BLOW MOULDING PROCESS
SUBMITTED TO MR.
KOSHAL TIWARI HOD
MECHANICAL DEPARTMENT DAUSA
RAJASTHAN INDIA
PREPARED BY MR. RAJARAM BAIRWA BRANCH
MECHANICAL ROLL NO. 11ESJME007
2
Molding is the process of manufacturing by
shaping liquid or pliable raw material using a
rigid frame called a mold or matrix. This itself
may have been made using a pattern or model of
the final object. A mold or mould is a
hollowed-out block that is filled with a liquid
or pliable material like plastic, glass, metal,
or ceramic raw materials. The liquid hardens or
sets inside the mold, adopting its shape. A mold
is the counterpart to a cast. The very common
bi-valve molding process uses two molds, one for
each half of the object. Piece-molding uses a
number of different molds, each creating a
section of a complicated object. This is
generally only used for larger and more valuable
objects.
3
Introduction

• Plastic formation process-manufacture of bottles
  and hollow-shaped parts
• Competitive with other processes, injection
  molding
• Advantages cycle is very short (low cost), lower
  mold cost than injection molding, high production
  rates in producing hollow parts with small or
  large opening

4
Historical Development
Year Development
1930 The first applications for blow molding were for cellulose nitrate
1940 Introduction of LDPE (Low Density Polyethylene ). With LDPE, the plastic industry growth rapidly
1942 The first polyethylene bottle was manufactured using the blow molding process
1950 The demand for blow moulding increases by the mass production of High Density Polyethylene (HDPE) and Polypropylene (PP) for various applications
5
Common plastics for blow molding

• HDPE (stiff bottle, toys, cases, drum)
• LDPE (flexible bottle)
• PP (higher temperature bottle)
• PVC (clear bottle, oil resistant containers)
• PET (soda pop bottle)
• Nylon (automotive coolant bottle, power steering
  reservoir)

6
The principle of blow molding

• A simple explanation of the principle of blow
  molding is similar to inflating a balloon

7
(No Transcript)
8
PARTS NAME OF BLOW MOULDING MACHINE
9
Extruder
10
Blow molding process general steps

• Melting the resin- done in extruder
• Form the molten resin into a cylinder or tube
  (this tube is called parison)
• The parison is placed inside a mold, and inflated
  so that the plastic is pushed outward against the
  cavity wall
• The part is allowed to cool in the mold and is
  then ejected
• The part is trimmed

11
blow molding process
12
(No Transcript)
13
Step 1
Step 2
14
Step 3
Step 4
15
EXAMPLES OF BLOW MOULDING COMPONENTS


Bottles/Containers with Handles
Toys
16
USE IN AUTOMOBILE, SOME BLOW MOULDED PARTS
17
ANY QUARY
18
THANKS.