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

1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineering Technology Topic: Plastic VI. – Jetting Prepared by: Ing. VladislavZelinka Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

2. EngineeringTECHNOLOGYPlasticJetting

3. Brielfy: Jetting of welded plastic (especially into multipart mould) are used for production of very shaped difficult products. Process is situated into the only (!) and quite fast productive operation. Cooled and rigid extrudates usually don´t need any other corrections and they are directly used for assembly. Process has very stable (permanent) size and shape quality. Whole process is very easily automated.

4. Plasticizing cylinder Granulate Jetting cylinder Jetting – machine (press): Opening and closing device of mold Gear Measurement unit hydraulics Divided mold Operator and steering gear Cut through injection molding machine (plastic is injected into the closed mold) Cylinder of injection Steering worm drive Plastic granulate Divided mold Plasticizing and injecting unit Opening and closing unit Densifying steering worm injector Closing cylinder heating plasticizing cylinder opening cylinder Backflowvalve product Injection molding machine

5. Mold is closed, plastic is injected. Plasticizing cylinder Unit with divided mold Heated plastic substance Granulated plastic Jetting (intomolds): We use knowledge of forming and pouring during jetting heating Jetting hole mold Cooling and take out of the product Filling zone Plasticizing zone Measured zone worm Heated and plasticizing extruder cylinder Closing of the mold, cylinder bring up Space in front of the worm Working cycle of injection molding machine

7. Summary: Jetting of welded plastic (especially into multipart mould) are used for production of very shaped difficult products. Process is situated into the only (!) and quite fast productive operation. Cooled and rigid extrudates usually don´t need any other corrections and they are directly used for assembly. Process has very stable (permanent) size and shape quality. Whole process is very easily automated.

8. ACTIVITY I.: Decide and choose the best solution of the problem: 1.) Jetting process is programmed in its all separate parts (heating, cooling, opening, closing, etc.) Is it more complicated than at cutting process? Yes / No / It isn´t easy to determine 2.) Extrudate from injection molding machine gradually and slowly change their colorful shade. Is it a fault? Yes / No / It isn´t easy to determine

9. ACTIVITY II.: Decide and choose the best solution of the problem: 3.) In the extrudate there is a part of a component of different color then the rest. Is it a problem?Yes / No / It isn´t easy to determine 4.) Extrudate isn´t quite finished in one place – the material is missing. Is it a fault? Yes / No / It isn´t easy to determine

10. VOCABULARY:

11. Resources: * Wikipedie – internetová encyklopedie (cs.wikipedia.org) * Technická Univerzita Liberec (www.ksp.tul.cz) * ENGEL CZ s.r.o. (www.engelglobal.com) * Dillinger, J. a kol. Moderní strojírenství pro školu a praxi. Praha: EUROPA SOBOTÁLES, 2007. ISBN 978-80-86706-19-1. * Mužík, J. Management ve vzdělávání dospělých. Praha: EUROLEX BOHEMIA, 2000. ISBN 80-7361-269-7. * Operační program Vzdělávání pro konkurenceschopnost, ESF 2007 – 2013. * Dostupné na: http://www.msmt.cz/eu/provadeci-dokument-k-op-vzdelavani-pro-konkurenceschopnost