Plastics shaped part with a plurality of fields, and method and

Details Plastics shaped part with a plurality of fields, and method and Plastics shaped part with a plurality of fields, and method and

1998-01-29

2000-08-15

Jones, Deborah

Stock material or miscellaneous articles

Structurally defined web or sheet

Edge feature

428 15, 428 33, 428 641, 428 667, 428121, 428124, 4283202, B32B 2302

Patent

active

061033480

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a plastic molding that comprises a plastic carrier or support with several regions separated from one another, at least some of these regions being provided, with optionally different films or sheets, as well as a method and a device for its production.


BACKGROUND OF THE INVENTION

A plastic molding is known from DE 44 08 446 A1 that comprises several regions separated from one another and provided with optionally different films. This printed specification also discloses a corresponding method and a corresponding device. The plastic carrier of the molding described in this printed specification is produced in one stage in a uniform working cycle. In the corresponding device a steel punch that can be guided in a vertical direction into the mold recess penetrates the bottom part of the matrix at the boundary between the regions, the edge of the steel punch extending into the mold recess defining the parting line that is to be produced. In a corresponding manner lugs that project into the mold recess are formed on the lower side of the matrix upper part, slightly displaced relative to the position of the steel punch. In this way the edge of the sheets is clamped or fixed, and in addition the prominent parting line between the individual regions of the plastic molding is optically marked.
The disadvantage of this procedure however is that, as regards the flow of the melt of the plastic carrier, there is no clear separation between the regions. High flow rates of the plastics melt may therefore occur, specially in the interstices between the lugs, which may lead to a warpage of the films, especially in the edge region of the parting line. Also there is an often non-uniform distribution of the flow rates of the plastic carrier located in the melt, particularly with large overall structural dimensions, which can likewise lead to a warpage of the films. This is optically disadvantageous, particularly with the nowadays widely employed textile films with line or check patterns.
A further common method for producing plastic moldings with several separated regions is to produce individual moldings and then join these together, for example by bonding or with clips.
The disadvantage of this procedure is that the method is complicated and expensive, and involves several devices and/or extra manual work. Also, the use of adhesives to bond individual moldings is undesirable for ecological and/or health reasons.


SUMMARY OF THE INVENTION

The object of the invention is accordingly to provide a plastic molding of the type mentioned in the introduction that can be produced quickly in one device and without film warpage.
This object is achieved according to the invention if the plastic molding comprises a plurality of individual moldings that in each case correspond to one of the regions and that are first of all separated from one another by separating spaces, and if the individual moldings are then combined together to form a unit by filling the separating spaces with the plastic carrier.
On account of the initial complete separation of the regions and the possibility of maintaining the regions small relative to the overall dimensions of the structural part, warpage of the individual films lying adjacent to the wall of the mold recess is avoided when the plastic carrier melt is injected or forced in. The injection or forcing in of the melt can take place relatively quickly without the visual appearance of the plastic molding, which is a primary quality feature particularly for example in the case of a coating with check pattern films, being adversely affected. In addition the production costs are reduced since a single tool is sufficient to produce the complete molding. Finally, on account of the absence of contacting surfaces that can rub against one another, the one-piece execution reduces the number of possible sources of rattling or squeaking sounds when the plastic molding is in its installed state, for example in vehicles.
An advantageous development of this

REFERENCES:
International Search Report of Jul. 30, 1997.
European Patent Office--Patent Abstracts of Japan, M-0968, vol. 14, No. 209 (concerning Publication No.: 02047021, Publication Date: Feb. 16, 1990, Inventor: F. Norikazu).
European Patent Office--Patent Abstracts of Japan, vol. 95, No. 11 (concerning Publication No.: 07195430, Publication Date: Aug. 1, 1995, Inventor: M. Toshio).

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