Plastic molds are considered very important tools in modern industry, so this course is a guide to learn about the plastic industry and the molds used in this regard

2. 1. Plastic materials
2. Molding classification
3. Some mechanical concepts
4. Mold’s materials
5. Blow molds
6. Injection molds
7. Die heads-Compression molding
8. Mold preventive maintenance

3. Part 1
Plastic Materials

5. The word ‘polymer’ comes from the Greek words
poly (meaning ‘many’) and meros (meaning ‘parts’).
Polymers are very large molecules made when hundreds of
monomers join together to form long chains.
Plastics are synthetic polymers that
can be shaped by heat or pressure.

6. 
Polymerizationmonomers
polymer

7. Raw Form (transparent)

8. Raw Form (Opaque)

9.  Lined-up chains make
plastics dense, rigid and
harder to melt
(e.g. high-density
polyethene).
The properties of a plastics depend on how the polymer
chains are arranged:
 Branching chains
make plastics light,
soft and easy to melt
(e.g. low-density
polyethene)

10. Like Butter
Like Egg

11. Like Butter
Like Egg

12. Heated
Softens
Cooled
Permanently Hard

13. Phinol formaldyide
Unsaturated polyester
Epoxy
Compression molding
Transfer molding
Wet Laying up
Molding
Methods
Molding
Mats.

14. Heated
Softens
Cooled
Hard

15. Injection molding
Extrusion molding
Blow molding
Thermoforming
Molding
Methods

16. Blow molding –
extrusion -
thermoforming
Injection molding

17. Phinol formaldyide
Unsaturated polyester
Epoxy
Compression molding
Transfer molding
Wet Laying up
Molding
Methods
Molding
Mats.

18. Injection molding
Extrusion molding
Blow molding
Thermoforming
Molding
Methods