Learning Intentions: We will learn about different kinds of plastic, their uses and how to form them...

~Plastics~Learning Intentions: We will learn about different kinds of plastic, their uses and how to form them

I will know I am successful if:• I understand the difference between thermoplastics and

thermosetting plastics

• I am able to suggest an appropriate plastic by looking at the properties

• I have practiced the shaping and finishing of acrylic by filing and cutting simple shapes

Types of Plastic

• Thermoplastics-Thermoplastics soften when heated.-They can be shaped when heated and harden as they cool.-When reheated they can be reshaped unless damaged be excessive heat

Types of Plastic

• Thermosetting Plastics-This type of plastic SETS when heated-Thermosetting plastics cannot be returned to their original state by further heating

What does that mean for

recycling…?

Properties of Plastics• Thermosetting• Epoxy Resin-Hard, heat resistant, electrical insulator

• Melamine formaldehyde

-Hard, heat resistant, resists some chemicals and resists stains

• Thermoplastics• Acrylic-Hard, easy cut, scratches easy, brittle, polishes well

• PVC (Polyvinylchloride)-Hard and stiff, OR soft and flexible…

Uses of Plastics

• Did you know…? - The Plastic in every product is carefully selected for the job.

• Acrylic-Hard, easy cut, scratches easy, brittle• Polystyrene-Stiff, wide range of colours, very light, buoyant• PVC (Polyvinylchloride)-Hard and stiff, OR soft and flexible…

Fishing Float

Uses of Plastics

• Did you know…? - The Plastic in every product is carefully selected for the job.

• Acrylic-Hard, easy cut, scratches easy, brittle• Polystyrene-Stiff, wide range of colours, very light, buoyant• PVC (Polyvinylchloride)-Hard and stiff, OR soft and flexible…

Fishing Float

What Plastic are we using today?

Acrylic!

Marking out your acrylic

• The acrylic will have a protective layer on it• This prevents scratching.• When covered you can mark with a

pencil or pen• Unprotected sheets are best marked

with a felt-tipped pen!

Cutting tools

Tenon Saw

HacksawCoping Saw

Junior Hacksaw

Let’s Get Shaping!!

The Strip Heater

• Best used for bending narrow strips of acrylic• Protective cover is removed • Area to be bent is marked with a pen• After heating, the acrylic can be shaped by using a jig

• For more complex shaping• For 3mm thick acrylic, the oven is set to 170 degrees C• Heated for approximately 15-20 minutes before forming

Approximately 20 minutes

Were we successful?

• I understand the difference between thermoplastics and thermosetting plastics

• I am able to suggest an appropriate plastic by looking at the properties

• I have practiced the shaping and finishing of acrylic by filing and cutting simple shapes

Learning Intentions: We will learn about different kinds of plastic, their uses and how to form them...

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