Process and device for coinjection molding multilayer products

a multi-layer, coinjection molding technology, applied in the field of coinjection molding multi-layer products, can solve the problems of flashing on the molding, high injection pressure, large presses, etc., and achieve the effect of simple and economical

Inactive Publication Date: 2003-01-16
JOHNSON CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0006] It is an aim of the invention to solve the aforementioned problems and to provide a simple and economical process f...

Problems solved by technology

However, these processes require high injection pressures, which in turn mean large presses, flash on t...

Method used

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  • Process and device for coinjection molding multilayer products
  • Process and device for coinjection molding multilayer products
  • Process and device for coinjection molding multilayer products

Examples

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example

[0037] A door panel similar in shape and nozzle-distribution to that shown in FIG. 2 and described above, was produced using a twin-injector press. The skin material was a thermoplastic elastomer TPO based, type VSR 561 / 2 (MFI=5 at 230.degree. C.; 2.16 kg-ASTM 1238L) produced by REAP (Milano-Italy) and the core was polypropylene filled with wood flour type CR (MFI=5 a 190.degree. C.; 2.16 kg-ASTM 1238L) also produced by REAP. The skin to core ratio was about 50 / 50 (by weight) and the injection temperature was 220-230.degree. C. for the skin and 190.degree. C. for the core.

[0038] The injection times were controlled on the basis of the press screw travel to give the sequential injection described above. Retainers and studs were produced by using slide-valve techniques to obtain retaining elements that were comprised substantially of core material only. A door panel was produced with on external surface skin) distributed evenly over the entire surface except for the injection points an...

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Abstract

Multilayer products, such as vehicle trim panels, provided with an external skin layer and an internal core layer are co-injection molded by injecting external material (P) through a first plurality of points of injection (3a-3c) and injecting the core material (C) through a second plurality of points of injection (4a-4g), the points and nozzles of injection of one material being physically distinct from those of the other material.

Description

[0001] The present invention relates to a process and a device for co-injection molding multi-layer elements and to the products thus obtained.[0002] In particular, the invention relates to the production of elements provided with at least one part having, an external skin which covers an internal core material. Examples of such product are trim panels and trim elements of motor vehicles.[0003] To obtain products of a type similar to those described above co-injection processes are already known which provide for the sequential injection of two or more materials from a single injector nozzle. In these processes a preset amount of skin material is initially injected into the mould, followed by one injection of core material and then another injection of skin material.[0004] The European Patent N.sup.o0579925, in the name of the applicant, describes a device for co-injection molding provided with independently heated hot channels and nozzles located in the wall of the mould. The nozzl...

Claims

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Application Information

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IPC IPC(8): B29C45/16
CPCB29C45/1642B29C2045/0032B29C2045/0093B29C2045/1651B29C2045/1654B29L2031/3014Y10T428/31855Y10T428/31504
Inventor SIANO, DANTE
Owner JOHNSON CONTROL
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