The document is a PowerPoint presentation on plastic molding processes, detailing injection molding, blow molding, and thermoforming techniques. It describes the injection molding process for creating complex parts from thermoplastic materials, the blow molding technique for producing hollow parts using parison, and the thermoforming process that forms plastic sheets under temperature and pressure. The presentation also covers machine components, materials used, and various applications for these plastic processing methods.

1. POWER POINT PRESENTATION ON PLASTIC
MOULDING PROCESSES AND PROCESS
PARAMETERS.

2. MANTHAN KANANI :- 140050119028
PRATIK KANANI :- 140050119029
DHRUV KHATRI :- 140050119030
DHRUVIT LAKHANI :- 140050119032

3. INJECTION MOULDING PROCESS
FOR PLASTIC PROCESSING
 It is a manufacturing technique for making parts
from thermoplastic and thermoset materials
 In contrast to the extrusion (which makes
continuous parts of constant cross section),
injection molding make discrete parts (with
complex and variable cross section)
 Molten plastic is injected at high pressure into a
mold, which is the inverse of the desired shape.
 The mold is made from metal, usually either steel
or aluminium
 Widely used for manufacturing a variety of parts,
from the smallest component to entire body panels
of cars

4. INJECTION MOULDING MACHINE

5. MACHINE PARTS
 Hopper is a tapered container working with a hopping
motion to transfer grains into cylinder
 Inside the cylinder there is a piston /plunger which is used
to move the material from cylinder into the mold
 Heating arrangement is placed above and below the
cylinder .
 The mold is in two halves , it has a mold cavity and the
mold has two ejector pins.

6. PROCEDURE
 As soon as the plastic is melted it will be pushed by the
piston into the sprue through which the material
would go into the mold cavity .
 The cavity will be filled by the pressure of the piston
and the mold should not be opened until the plastic
solidifies.
 When the plastic solidifies the ejector pins are
hydraulically moved backwards .

7. MATERIALS USED
 Acetate
 Acrylonitrile butadiene styrene (ABS)
 Cellulose acetate
 PVC ( poly vinyl chloride)
 Polycarbonate
 Polyesters
e.t.c.

8. BLOW MOULDING PROCESS FOR
PLASTIC PROCESSING
 “It is a plastic processing technique which is used to
produce hollow plastic parts by inflating a heated
plastic until it fills a mold and forms the desired shape”
 The raw material used for processing in blow molding is
called parison
 Parison is a preform tube that is hollow and it has a hole
at one end

10. TYPES OF BLOW MOULDING
 Injection blow molding
 Stretch blow molding
 Extrusion blow molding

11. THERMOFORMING PROCESS FOR
PLASTIC PROCESSING
 “ Thermoforming is a plastic processing technique in
which the thermoplastic sheets are formed by applying
temperature and pressure inside the mold .”
 The raw material here is usually plastic sheet
 Different types of this process are
I. Vacuum forming
II. Pressure forming
III. Matched die forming

12. VACCUME FORMIMG PROCESS
o The vacuum pressure is used to form the heated
thermoplastic sheet into the desired shape.
o Thermoplastic sheet is placed on the mold surface
and fixed with the help of clamping unit.
o The sheet is heated until it softens and there after ,
vacuum needs to be applied quickly.
o There is tank with nozzles that suck air and creates
vacuum in between sheet and mold.

13. VACCUME FORMIMG PROCESS

14. APPLICATIONS OF
THERMOFORMIMG
 Thermoforming has many applications like
I. Food packaging
II. Automotive parts
III. Aircraft windscreens
IV. Vehicle doors