Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky. Tutorial: Engineering Technology Topic: Plastic III. –Usability Prepared by: Ing. Vladislav Zelinka

Engineering TECHNOLOGY Plastic Usability

Briefly: We use them there where we need resistance against chemical or weather attack or against corrosion. On those places should not interfere resistance against temperatures or solvent, lower hardness, partial flammability or difficult recyclability. Plastics are either:  Hard or solid (fragile)  Hard or flexible (elastic) Or  Elastic.

Important qualities of plastics: (+) Resistant against chemical, corrosive or weather effects Decorative (surface, whole profile) Light They don´t conduct electricity or heat/cold much (-) Lower hardness or resistance against heat Partially they burn or fume They do not resist some solvent Difficult recyclability

Classification of plastics according to their usage: Hard solid Hard flexible Elastic

Tests (of usability): mechanical thrust (flexibility, hardness, cold creep) hardnessobr. heat / cold (shape stability, brittleness) friction

Summary: Granulated material is mostly feedstock for ThermoPlastics and Elastomers. ReactoPlastics are usually in powder form or liquid form, or they might be also mixed into a paste. We process plastics either as intermediate material for further processing or directly to completed product.

ACTIVITY I.: Decide and choose the best solution of the problem: 1.) Product is going to be used as tool handle which will be used for strong and frequent tightening of a nut in external working environment. Will you use plastic? Yes / No / It isn´t easy to determine 2.) Product should be used in colliery of 800 meters depth out of machinery reach. Will you use plastic? Yes / No / It isn´t easy to determine

ACTIVITY II.: Decide and choose the best solution of the problem: 3.) Product will be transparent and will have shape of containment of ceiling light with fluorescent bulb. Will you use presswork? Yes / No / It isn´t easy to determine 4.) Product will have a shape of very thin and long foil (film). Will you use surface rolling? Yes / No / It isn´t easy to determine

Vocabulary: Granule PowderPrášek PastePasta Intermediate materialPolotovar Completed productHotový výrobek ExtrusionVytlačování BlowingVyfukování JettingVstřikování PressworkLisování Hardening, cementationZpevňování Parting planeDělící rovina radiusRádius Splayúkos

Resources * Wikipedie – internetová encyklopedie (cs.wikipedia.org) * Technická Univerzita Liberec ( * ENGEL CZ s.r.o. ( * Dillinger, J. a kol. Moderní strojírenství pro školu a praxi. Praha: EUROPA SOBOTÁLES, ISBN * Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, ISBN * Operační program Vzdělávání pro konkurenceschopnost, ESF 2007 – * Dostupné na: k-op-vzdelavani-pro-konkurenceschopnost