Polymers: Shape & Form
Design & Technology: AQA GCSE, topic 5.3.2
Shape & Form
There are many different methods of shaping and forming polymers. This variety reflects the range of products that can be made from polymers.
Cutting
- Cutting can be done through two main methods:
- Hand cutting.
- Machine-based cutting.
- Hand cutting uses a coping saw.
- Coping saws are used to cut curved and straight lines.
- Hand cutting can be more difficult than machine-based cutting.
Sanding
- Sanding can come in two forms:
- Paper form.
- Machine form.
- You can use sandpaper or a sanding block.
- To sand something you rub a gritty abrasive paper on the surface of the material.
- Sanding reduces the surface's dimensions.
- Sanding enhances the surface's finish, getting it smooth.
Wet and dry paper
- Polymers can be sanded with sandpaper.
- To get a smooth finish, wet and dry paper is used.
- Wet and dry paper has smaller grit particles.
- This gives the polymer a better finish.
- Wet and dry paper is used dry and then wet with water to smooth the surface.
- A file can be used to remove teeth marks on the edges of polymers.
- Teeth marks are created by the saw blades.
Sanding polymers
- Prepare the polymer.
- Ensure that the surface is clean and free from dirt.
- Ensure you work evenly and in a circular or linear motion.
- A rotary or belt sander can be used to speed this process up.
- It is important to use an extractor fan or a dust mask.
- This prevents you from inhaling dust particles.
Test yourself on Polymers: Shape & Form
What are the two main methods of cutting?
What type of saw does hand cutting involve?