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Injection molding of parts made of more than one material

The two very little investigated aspects of the multi-component injection-molding techniques are an the one hand the question about the possible material-combinations for overmolding use. The second aspect is the construction of a simple sandwich-molding machine that is cheap and easy to handle.

The possible material combination will be investigated at first from the chemical view. Here it is desired to understand why and under which conditions different materials are compatible so that they do not separate in later use. After clarifying the chemical and physical basis for a long lasting connection the special border conditions of the injection moulding technique are discussed. Here especially compatible materials will be used as they should be recycled later on, but for applications with turning parts (e. g. hinges) they must be incompatible just during the processing. With knowledge of the possible parameters compatible materials get incompatible for a short period of time and may be mixed and recycled later to a homogeneous blend for recycling use.

The construction of a sandwich-molding machine is based on the physics of the flow with two polymer components not mixed in each other. On this basis a concept is defined with the main ideas:

  • easy modification of a Standard injection moulding machine
  • use of the new Sandwich-machine exactly like a standard injection moulding machine and without special knowledge of the Sandwich-process

The theses to the materials-combination and the evidence of the Sandwich-molding machine are each proved empirically. For the first theme a special two-component tensile test-bar is used, the machine concept can be clarified with a two-component machine that has two separate injection units connected via a special mould with two separate gates.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Christoph Jaroschek

Christoph Jaroschek
Institut für Kunststoffverarbeitung
Rheinisch-Westfälische Technische Hochschule Aachen

Information

Free keywords: Multi component injection molding, Sandwich-molding, injection molding, overmolding, injection welding, bond strength, Mono-Sandwic
Institute / chair: Fakultät Maschinenwesen der Rheinisch-Westfälischen Technischen Hochschule
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr.-Ing. E.h. Walter Michaeli(Betreuer), Prof. Dr.-Ing. G. Menges
Publication year: 1993
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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