Stock material or miscellaneous articles – Structurally defined web or sheet – Honeycomb-like
Patent
1995-09-13
1997-11-04
Aftergut, Jeff H.
Stock material or miscellaneous articles
Structurally defined web or sheet
Honeycomb-like
15624413, 156296, 1563082, 428118, B32B 3102
Patent
active
056837828
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention pertains to a process for the production of a honeycomb body, which comprises a plurality of small tubes bonded to each other at their sides. The invention also concerns a honeycomb structure which is, in particular, produced according to the above-mentioned process.
BACKGROUND OF THE INVENTION
Honeycomb structures, or honeycombs for short, are used for a large number of different applications. Among other things, they are used for the production of so-called sandwich boards, where on the face of one or both of the lateral honeycomb surfaces, cover layers are applied and bonded to the honeycomb structure. A polyurethane or epoxy resin adhesive can be used for that purpose.
Honeycombs of a reasonable cost are often made of polypropylene which due to its mechanical properties is suitable for very many usage purposes. When polypropylene is used as the construction material for the honeycomb structures, a bonding of the small honeycomb tubes to each other and to a cover layer makes a pretreatment of the contact points of the honeycomb structure necessary. This can be carried out by means of a corona treatment, where for a bonding of the honeycomb with a cover layer, the contact points of the honeycomb body are subjected to an electrical high-voltage treatment. The so-treated contact points can then be easily bonded to a cover layer or the like.
Problematical in this regard is the fact that the corona-treated bonding points remain adhesively-active for only a limited time, so that the bonding with a cover layer must take place either immediately or a short time after the treatment. Often, however, the cover layer or the cover layers are not applied by the honeycomb manufacturer, but by a user to whom they have been supplied, who must then undertake the necessary pretreatment, which, however, only makes sense if large quantities are involved.
For that reason, it is also already known to first provide polypropylene honeycombs with a corona treatment or the like, and then to bond or laminate thereto a layer made of a formed fabric, which itself forms a good bonding base. In this condition, the honeycomb can then be delivered to the end user, who can bond any kind of a cover layer to the formed fabric layer. What is disadvantageous in this regard, however, is that the formed fabric layer will absorb a great deal of adhesive, and as a result, a portion of the weight advantage of a sandwich honeycomb is again lost, and also a great deal of adhesive material must be used.
Because of the above-described problems, the range of applications of a honeycomb made of polypropylene, or of polyolefin in general, is limited, so that in many cases recourse must be made to other, more expensive honeycomb materials.
SUMMARY OF THE INVENTION
As a result, the object exists, in particular, of developing a process that permits a simple and low-cost production of the above-mentioned honeycomb structures, wherein a costly corona or similar intermediate treatment can be dispensed with for the individual small tubes, which may also be made of the various thermoplastic synthetic materials.
It is also an object of the present invention to create a honeycomb of the above-mentioned type, which can be used universally, and in conjunction therewith, can be produced and processed at a reasonable cost. In particular, it should be possible to bond this honeycomb in a problem-free way to cover layers made of different materials while using the previously common adhesives.
For the process of the above-mentioned type, the solution to this object according to the invention resides in the fact that the individual small tubes are manufactured with a layer, at least on the outside, made of a bonding agent or similar kind of adhesively-active thermoplastic material in a co-extrusion process, that the individual small tubes are thereafter lined up alongside each other, and that in a subsequent process step the small tubes lying adjacent to one another are subjected to a thermal treatment for bonding or joining th
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Aftergut Jeff H.
Tubus Bauer GmbH
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