Studiemateriale
§Study guide — plastic maker
This page brings together the core of the trade so you can revise before exams and in everyday life. Use it as a checklist of what you should be able to explain in your own words.
The material
The most important distinction is between thermoplastic (softened by heat can be formed again and again can be recycled) and thermosetting (hardens permanently by chemical reaction cannot be melted again). It controls both method machinery and the education's specialties.
Production methods
- 01Injection moulding: molten plastic is pressed into a closed mould – the trade's most important method
- 02Extrusion: long profiles such as pipes and plates.
- 03Thermoforming: a heated sheet is formed over a mold
- 04Blow moulding: hollow items such as bottles
What controls the quality
Temperature, pressure, and time are the central settings. Together with a good mould and clean, dry material they determine whether the part is fully filled, holds the dimension, and is free of defects.
Safety
- 01Melted material and hot parts cause serious burns — wear gloves, keep distance
- 02Moulds close with great force — guards must never be rendered inoperative
- 03Plastic can release fumes when heated — use extraction
- 04Be extra careful at startup, material change and cleaning
Quality
Quality is that each part is like the previous one. Because an error is repeated many times in fast production, continuous control and finding and correcting the cause — not just scrapping — is the quality work itself.
“Understand the material master the machine catch the first error — so a thousand parts become good instead of a thousand bad.”
— Collection for future plastic makers