how a plastic made

8/7/2019 How a Plastic Made

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THE PROCESS IN MAKING

THERMOPLASTIC,

THERMOSET

PREPARED BY:

NURUL ATIQAH MOHAMADSITI NORAFATIEN JUSOH


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THERMOPLASTIC


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Rods, tubes, pipes, Slinkys, and sheet

and thin film (such as food wraps) areextruded then coiled or cut to desired

lengths.

Plastic fibers also are made by anextrusion process.

Liquid resin is squeezed through

thousands of tiny holes calledspinnerets to produce the fine threads

from which plastic fabrics are woven.


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Injection Molding

is the second most widely used process to

form plastics.

The plastic compound, heated to a semifluidstate, is squirted into a mold under great

pressure and hardens quickly.

The mold then opens and the part is released.

This process can be repeated as many times as

necessary and is particularly suited to mass

production methods.


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Injection molding is used for a wide variety of

plastic products, from small cups and toys to

large objects weighing 30 pounds or more.


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Blow Molding

Pressure is used to form hollow objects,

such as the soda pop bottle or two-

gallon milk bottle, in a direct or indirectmethod. In the direct blow-molding

method, a partially shaped, heated

plastic form is inserted into a mold.Air is blown into the form, forcing it to

expand to the shape of the mold.


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In the indirect method, a

plastic sheet or special shapeis heated then clamped

between a die and a cover.Air is forced between the

plastic and the cover andpresses the material into the

shape of the die.


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Processing / ManufacturingThermoplastics

Injection molding:


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Processing / ManufacturingSandwich Structures:

Low-density core material

Parts: skies, aircraft interiors, building panels

stiff flat sheets

stiff flat sheets


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THERMOSET


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Processing / ManufacturingThermosets

Contact molding; Spray up

Vacuum Bag


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Autoclave

Parts: large aircraft structures, radomes, vertical

stabilizers, windmill blades, fuselage.


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Resin Transfer

Molding (RTM):

Parts: autobodies, tennis racquets,

skies, cabs, engine cowls.Parts: yachts, hulls, etc


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Reaction Injection Molding (RIM)

Parts:Auto and Truck body parts, bumpers.

Centrifugal casting

Parts: Tanks,

pipes, stacks.


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Compression Molding

Parts; Insulation panels, sandwich pre-pregs, substrates for printed

circuits

Placing a pre-mix charge into a mold and then closing the die Resin

expands and fills the mold

Hot Platen Presses (MOP)

BMC (pre-mix slug w/ chop fiber) or SMC (w pre-preg).

Injection compression molding


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Pultrusion

Parts: Profiles and shapes

Continuous Lamination


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Braiding

Parts: Clubs, bats, tennis raquets, masts, poles.

Deformable semi-finished braid product based on

interlaced continuous strands


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Filament Winding

Parts: pipes, tanks, body shells,

Winding a pre-preg or resin-impregnated reinforcementfibers around a rotating mandrel

Tape Winding Tapes impregnated w/ resin, wrapped around a mandrel


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REFERENCES

http://www.reachoutmichigan.org/funexperime

nts/quick/plastic.html

Accessed on 26th ofSeptember 2010

http://www.americanchemistry.com/s_plastic

s/doc.asp?CID=1571&DID=5972

-Accessed on 26th ofSeptember 2010


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how a plastic made

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