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 IV. - Processing methods Prepared by: Ing. Vladislav Zelinka

Engineering TECHNOLOGY Plastic Processing methods

Briefly: Plastic processing has some characteristics of pouring technology but also of metal forming. There are these methods of plastic forming: Extrusion + blowing Jetting (into the forms) Presswork Foaming.

 1.) Extrusion /blowing: Pipe extrusion Blowing and setting Take out Compressed air Profile nozzle Split mould (cooled) Plastic pipe Blowing hose Product Extrusion and blowing of hollow products

2.) Jetting (into moulds): During the jetting we use the knowledge from forming as well as from pouring. Opening and closing device of mold Plasticizing cylinder GranulateJetting cylinder Gear Measurement unit Operator and steering gear hydraulics Divided mold Cut through injection molding machine (plastic is injected into the closed mold) Opening and closing unit Divided mold Plasticizing and injecting unit Plastic granulate Cylinder of injection Steering worm drive injector Densifying steering worm Closing cylinder opening cylinder product Backflow valve heating plasticizing cylinder Injection molding machine

Thermoset powder Filler Upper part of the mold Lower part of the mold slide heating Upper ejector Lower ejector extrudate Filler Procedure of press forming 3.) Presswork:

4.) Foaming: Guide track PUR belt cross section PUR folders Mixing head with slot jet Bearing separating foil Foaming PUR Production of polyurethane foam belt

Summary: Plastic processing has some characterics of pouring technology but also of metal forming. There are these methods of plastic forming: Extrusion + blowing Jetting (into the forms) Presswork Foaming

Flatwise folded hollow foil Rim cutter Reel Draw pulleys Flat boards Idler pulleys Air cooling Shaping extension Circular nozzle Inflatable air Liquid plastic Foil production by blowing extruded hose Using of extruded pipe as an intermediate material.

ACTIVITY I.: Decide and choose the best solution of the problem: 1.) Product will have very thin and almost evenly strong wall of rounded shape with 2 liter capacity. Will you use foaming? Yes / No / It isn´t easy to determine 2.) Product will have opposite (negative) full shape of counterpart with dimension about 0,2x0,5x0,9 meter and should absorb possible shocks. Will you use blowing? 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 rolling? Yes / No / It isn´t easy to determine

VOCABULARY : ExtrusionVytlačování BlowingVyfukování JettingVstřikování PressworkLisování FoamingZpěňování Pouring, castingOdlévání FormingTváření Splay, draftÚkosy RadiusRádiusy contractionsmrštění

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