Textiles: knitting – Fabrics or articles – Incorporated unknitted materials
Patent
1992-04-09
1994-06-07
Falik, Andrew M.
Textiles: knitting
Fabrics or articles
Incorporated unknitted materials
51295, D04B 2114, C09K 314
Patent
active
053178866
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flexible abrasive means having an underlay, which comprises a knitted fabric, which consists of a base knitted fabric and at least one layer of warp threads and at least one layer, separated from the latter, of weft threads and includes a strengthening size.
In the case of flexible abrasive means with textile underlay, the strength is naturally at its greatest and the elongation at its least in the direction of the weft and warp threads. In many applications, however, a high dimensional stability is also desired in directions other than the warp and weft directions. This is particularly evident in the case of so-called segmented wide bands, in which the direction of the warp and weft threads does not coincide with the running direction. If there is inadequate dimensional stability, these display a tendency to form creases. General dimensional stability is also very important in all applications which result in the abrasive means being subjected to a considerable punctiform or fulling stress.
Even in the case of woven fabrics, the reduction in dimensional stability in directions other than the directions of the threads is pronounced. It is even greater in the case of sew-knitted, i.e. stitch bonded fabrics, the structure of which is substantially looser than that of woven fabrics, said sew-knitted, or stitch bonded fabrics being used to an increasing extent recently as abrasive underlay.
The object of the invention is to provide an abrasive means of the type mentioned at the beginning which has high dimensional stability in the directions than the directions of the warp and weft threads. This provides that the abrasive structure of the invention is particularly well suited for use in a segmented abrasive belt in which the direction of the warp and weft threads of the underlay fabric from which the belt is formed differs from the longitudinal direction of the belt. This provides that the abrasive structure of the invention is particularly well suited for use in a segmented abrasive belt in which the direction of the warp and weft threads of the underlay fabric from which the belt is formed differs from the longitudinal direction of the belt.
The solution according to the invention consists in that in each case a plurality of warp threads per needle space are held next to one another by different binding into the pattern in such a way that they run partly under and partly over the cross threads of the base knitted fabric.
The desired effect can be increased by all the warp threads of one group being separated from one another by cross threads of the base knitted fabric alternating from the upper side to the underside of this warp thread group. This does not have to apply to every crossover point. However, it should be ensured by crossover points frequently following one another in the longitudinal direction in the repeat.
To explain the advantageous behaviour of the material according to the invention, the following interrelationships play a part. In an elongation of the material in the diagonal direction, a twisting or bending of the warp and weft threads with respect to one another takes place at each crossover point. The mutual binding of the threads at these points by the size can reduce these relative movements but not rule them out. In the case of the known sew-knitted fabrics (EP-B 45 408) there is only a limited number of crossover points available between weft and warp threads, namely only one crossover point per needle space in each course. This also applies even if a plurality of warp threads have been introduced into each needle space, because they are tied together by the sewing threads in the form of a skein to give a bundle of threads having a standard round thread crosssection. This tying-together is avoided by the invention. The plurality of warp threads per needle space spread out two-dimensionally. Depending on the number of warp threads per needle space, a multiplication of the crossover points in comparison with known sew-knitted fabrics is produced, and consequ
REFERENCES:
patent: 446084 (1891-02-01), Stowe
patent: 3675447 (1972-07-01), Jackson
patent: 3728876 (1973-04-01), Richard et al.
patent: 3879964 (1975-04-01), Pascual
patent: 4425398 (1984-01-01), Berczi
patent: 4518640 (1985-05-01), Wilkens
patent: 4826508 (1989-05-01), Schwartz et al.
patent: 4867760 (1989-09-01), Yarbrough
International Search Report for PCT/EP 90/01689.
Leaflet of Gustav Ernstmeier GmbH and Company KG, 12 pages.
Calvert John J.
Falik Andrew M.
Hermes-Schleifmittel GmbH & Company
LandOfFree
Flexible abrasive means does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexible abrasive means, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible abrasive means will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-785525