ASSIGNMENT- desk tidy QUESTION 3

1. Choose 2 machines that you used in the fabrication of your desk tidy. With these machines in mind, outline WPH&S considerations that must be adhered to when using these machines. Include photographs of your chosen machines (OnGuard may be an excellent resource for this question).
2. The material you are using for your desk tidy is called Polymethylmethacrylate (ACRYLIC). It has specific properties and uses.  Choose 2 other common polymers and in table form give their industrial name, common name, properties and uses
3. Extrusion, injection moulding, compression moulding, vacuum forming and laminating are examples of common manufacturing processes used with polymers (Plastics). Choose one process and with the use of diagrams and bullet points outline the process.
4. Extension Work - Using processes acquired from your maths lessons, calculate the amount of acrylic sheet that your FINAL desk tidy represents. Show all calculations; answer needs to be in square metres.

Q3.

COMPRESSION MOULDING

Moulding through the force of compression is very important in the industrial world. the materials used are melamine formaldehyde, phenol and urea. When heat and pressure are applied to these materials it moulds into a shape using a mould.

The stages of compression moulding is...

1. The mould is heated.
2. A 'slug' or piece of the selected plastic is placed into the mould and warms up.
3. The hydraulic press begins to move down when the plastic has reached the correct temperature..
4. As the upper and lower mould meet, the plastic is compressed into the shape of the mould.
5. The upper mould moves upwards and the plastic piece (in this case a tray) is removed.