Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-10-31
1999-06-22
Sells, James
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156290, 156494, 156496, 156497, 156553, B32B 3100
Patent
active
059139978
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase of PCT/DE96/01371 filed Jul. 20, 1996 and based in turn on German national application 19527057.6 of Jul. 25, 1995 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a process for the thermomechanical treatment of a fleece web which is comprised of filaments and/or fibers of thermoplastic synthetic resin, in a continuous procedure.
Filaments are characterized in the sense of the invention as of theoretically endless length individual synthetic resin threads which are formed into a nonwoven fleece whereby the individual filaments are united together at the crossover locations and contact locations in a material-to-material junction. Such fleece webs are also known as spun bond. Fibers are characterized, by contrast, as short fiber-shaped synthetic resin elements which are generated for example with the aid of the melt-blown technique and form a melt-blown fleece whose fibers are also united at the crossing locations in a material-to-material junction. The fleece web can be formed as a monolayer or can be multilayered and formed from a plurality of individual fleece webs.
Processes for the thermomechanical treatment of a fleece web, which is comprised of filaments and/or fibers of thermoplastic synthetic resin, are known in various embodiments. A common thermomechanical treatment is so-called bonding. Under this designation it is understood that the fleece web is simultaneously provided with point weld locations which have a predetermined weld point diameter and a predetermined uniform grid pattern distributed over the fleece web. As a result the filaments or fibers are not completely welded, i.e. do not form small plates simultaneously with one another. The weld points result in a structure different from that of small plates in that the filaments and/or fibers at the weld points have at least a recognizable texture. Such weld points also are referred to as bonding points.
The bonding effects an increase in the strength of the fleece web. To bring about a defined increase of the strength, all of the point weld locations must practically have the same geometry and must structure and be uniformly distributed over the length and breadth. The bonding is effected according to the state of the art at least directly in conjunction with the fleece formation in the apparatus for producing such fleece and, indeed, with the aid of bonding point embossing rolls which are heated. There is no special influence of the temperature with which the fleece web is fed to the bonding. The resulting bonding can be improved with reference to the uniformity. Also, the quality of the bonding cannot be readily matched to different operating conditions, for example, for different synthetic resins or web thicknesses or filament diameter or fiber diameter.
Another customary thermomechanical treatment is the stretching of the finished fleece web in the length direction and/or transverse direction with the aid of corresponding stretching units stretching also. The stretching as well results in an increase in the strength. Stretching must also be carried out uniformly in the sense of the above requirements. In conjunction with such stretching, it is known to preheat the fleece web before it is fed to the stretching unit or while it is in the stretching unit, usually with the aid of infrared radiators. Even this known feature can stand improvement, especially with reference to the matching to the different operating conditions.
OBJECTS OF THE INVENTION
It is an object of the invention to provide a process with which in a simple way in the described sense a very uniform thermomechanical treatment which is matched to different operating conditions of a fleece web of filaments and/or fibers of thermoplastic synthetic resins is possible.
SUMMARY OF THE INVENTION
This object is attained in accordance with the invention in a continuous process for thermomechanical handling of a fleece web which is comprised of filaments and/or fi
REFERENCES:
patent: 3855045 (1974-12-01), Brock
patent: 3949128 (1976-04-01), Ostermeier
patent: 5730821 (1998-03-01), Joest et al.
Kunze Bernd
Schulz Herbert
Dubno Herbert
Reifenhauser GmbH & Co. Maschinenfabrik
Sells James
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