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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Strojírenská technologie Topic : Plasty – Plastics – t ypes and structures Prepared by: Ing. Elena Nová. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Strojírenská technologie Topic: Plasty – Plastics – types and structures Prepared by: Ing. Elena Nová Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. Plastics – types and structures

  3. Plastics – types and structures • Plastics are divided according to their inner structure into three groups: • Thermoplasts • Reactoplasts • Elastomers

  4. Plastics – types and structures • Thermoplasts can be heat formed and welded • Thermoplasts become softer at higher temperatures and again harder at lower temperatures.Injection moulding:

  5. Plastics – types and structures • Most known thermoplasts: • Polystyren(PS). • Polyethylen (PE). • Polyamid (PA - nylon, silon). • Polyethylentereftalát (PETP - PET). • Polytetrafluorethylen (PTFE - teflon). • Polyvinylchlorid (PVC - novodur, novoplast). • Polymetylmetakrylát (PMMA - plexisklo).

  6. Plastics – types and structures • Polystyren

  7. Plastics – types and structures • Reaktoplasts cannot be formed or welded at higher temperatures. • After hardening they cannot be heat-formed. Most known thermosets: • Bakelite. • Rubber. • Epoxide, resin.

  8. Plastics – types and structures • Elastomer, Rubbers, - are elastic but cannot be formed or welded at higher temperatures. • Most known elastomers and elastic fibers: • Elastin's - polymers based on polyurethane Elastodiens - based on polyisopreens of rubber.

  9. Plastics – types and structures • Usage of plastics: • Textile fibers, strings, loop piles, foils • Plates, pipes, profiles, blocks • Pressing andinjection matters • Technical resins • Lightened materials

  10. Decide: • Can they be formed at higher temperature • Cannot be formed or welded at higher temperature • Are they elastic, but cannot be formed or welded at higher temperature • Reaktoplasty • Elastomery • Termoplasty

  11. Translate vnitřní struktury pevnost tvrdý měkký tekutý rozpad teplota

  12. Used literature • http://ok1zed.sweb.cz/s/01-machine-tech/plast.htm • http://www.ksp.tul.cz/cz/kpt/obsah/vyuka/skripta_tkp/sekce_plasty/01.htm

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