Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1989-05-05
1991-11-12
Van Balen, William J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
1563082, 1563099, 264321, 428159, 428170, 428192, 4283142, 4283193, B32B 302, B32B 326
Patent
active
050647091
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a composite part of flexible cellular material and elastic, unvulcanized rubber material.
It is known to bond, weld, clip open-cell foam material to a rubber-like rubber material. These methods are, however, relatively expensive from the standpoint of manufacturing technique and also are not always satisfactory in use.
It is the object of the present invention therefore to provide a composite part of flexible cellular material and elastic rubber material which is simple to manufacture and advantageous in use.
SUMMARY OF THE INVENTION
This object is achieved by a composite part wherein the cellular material is a cellular synthetic material (3) and is compressed with the rubber material (2) under cellular synthetic material hot-stamping conditions, the cellular synthetic material being compacted in the region of attachment.
Rubber material with elastic properties is ordinarily vulcanized at about 160.degree. C. to 180.degree. C., for a period of time of from two to three minutes. On the other hand, a molded part of cellular material is produced by the so-called hot-stamping method at a temperature of about 230.degree. C. and for a period of time of about one and a half minutes. Therefore, up to now it has been assumed that it is not possible to effect hot stamping of the foam material simultaneously with a vulcanizing of the rubber material. Surprisingly it has, however, been found that the rubber material vulcanizes satisfactorily even upon brief action of higher temperatures and, if a compressing with cellular material is effected simultaneously, an advantageous bond is formed between the cellular material and the rubber material, with simultaneous compacting of the cellular material in the region of the attachment.
It is particularly advantageous to employ, in the case of a composite part according to the invention, a rubber material which is resistant to high temperatures. For example, so-called CR or NBR rubbers offer themselves for this purpose. In addition to this, silicone rubber, for instance, can also be used to advantage.
The foam material is preferably compacted or covered by a skin on at least one side.
Composite parts of the type in question can, for instance, be used in automobile engineering, in which connection the region consisting here of rubber material can assume sealing functions, for instance in the region of a lamp mount or an oil-drain opening, while the cellular material carries out substantially damping functions. Due to the fact that the foam part is preferably compacted or even covered by a skin, there results in this connection in addition, however, an advantageous seal also with respect to the part of cellular material, which seal is at least substantially water-repellent.
Surprisingly it has also been found that even in the case of foam material covered by a skin, the composite part of the invention has, due to the compacting under hot-stamping conditions, still sufficient adherence between the cellular material and the rubber material.
With respect to the rubber material, it may also, in another advantageous embodiment, be provided with a cell-like structure. For example, this is achieved in the manner that an expansion agent is added to the rubber material. With a slight weight of the composite part, there is obtained a seal which is excellent also in the region of the rubber material.
With respect to the structural development of the composite part, it is first of all possible for the rubber material and the cellular material to adjoin each other with butt surfaces or at least obliquely. In a preferred development, it is provided that the cellular material overlap the rubber material, at least in part. It has also been found that with respect to the said fields of use for the composite part, the cellular material can completely surround the rubber material on one side. By the pressing process with the parameters indicated further above, it then results that the cellular material is highly compressed
REFERENCES:
patent: 4247513 (1981-01-01), Liu
patent: 4524096 (1985-06-01), Schiedegger
patent: 4533577 (1985-08-01), Mier
Farber Martin A.
Irbit Research & Consulting AG
Van Balen William J.
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