Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1993-03-01
1995-12-19
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
19163, 191611, 428288, 428292, 428293, 428294, B32B 512, D04H 158
Patent
active
054767032
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for forming a semifinished nonwoven product.
This invention also relates to a semifinished nonwoven product which can be obtained by this method.
In the field of nonwoven fabrics, it is known to obtain laps by means of a spreading and lap-forming machine in which a web delivered by a card is folded in zigzag pleats. The lap has a relatively substantial thickness and a known practice consists in drawing it out in order to reduce its weight per square meter at the exit of the spreading and lap-forming machine. However, the product thus obtained is delivered by the drawing frame at a speed which is often considerably higher than that of machines used for subsequent processing of the product such as, for example, machines for forming transverse rows of stitches in order to consolidate the product, or else carpet machines. It is admittedly possible to some extent to operate the card and the spreading and lap-forming machine as well as the drawing frame at a low speed but their efficiency may thus be impaired. Be that as it may, the large capital investment involved in machines of this type would not in such a case be put to good use.
Patent document EP-A-0,129,516 describes a drawing frame having rollers each provided with a resilient peripheral covering consisting of teeth which are intended to bend in contact with the lap in order to prevent the formation of holes in the drawn-out lap. This resilient covering improves the grip of the rollers on the lap but does not in any way solve the speed problems mentioned earlier.
Patent document FR-A-2,649,130 describes a method for manufacturing textile products such as carpets from a web of fibers. A first mechanism places the fibers of the web in preferred orientations. The fibers thus oriented are immediately delivered to a second mechanism which manufactures the carpet. The fibers thus oriented do not constitute a coherent semifinished product but form an ephemeral material which cannot be coiled or stored and is obtained without either a spreading and lap-forming machine or a drawing frame.
The object of the present invention is to overcome these various disadvantages and difficulties of operation.
In accordance with the invention, the method for forming a semifinished nonwoven product in which a lap is formed by successively folding a web of fibers delivered by a card, said lap being then drawn-out in a drawing frame, essentially involves the use of a drawing frame equipped with rollers each provided with a peripheral covering having teeth which are caused to penetrate to the heart of the lap, and in so adjusting the degree of draft that the majority of the fibers within the drawn product are distributed in two orientations which are substantially symmetrical with respect to the longitudinal direction of the drawn product and which form with this direction an angle within the range of 30.degree. C. to 60.degree. C.
There is thus obtained, surprisingly, a semifinished product having two very privileged orientations of fibers which are preferably substantially perpendicular to each other and at 45.degree. C. to the longitudinal direction of the product. The expression "very privileged orientation" is understood to mean that a majority of fibers has either of these two orientations. This is surprising because, as a general rule, the fibers of products which are drawn-out after lap formation have practically a random orientation.
Moreover, the semifinished product obtained offers particularly advantageous characteristics. Considering the fact that the product has simply been drawn-out after lap formation, it has an astonishing degree of cohesion. It can thus be coiled as it passes out of the drawing frame, then uncoiled prior to use in production lines for subsequent processing. At the time of uncoiling, it is observed that the fibers of the different turns have practically not interpenetrated and mixed at the time of storage in the coiled state.
The semifinished product in accordance with the invention can thus be produced a
REFERENCES:
patent: 3682734 (1972-08-01), Burger
patent: 4910064 (1990-03-01), Sabee
patent: 5182835 (1993-02-01), de Giudici
patent: 5239734 (1993-08-01), Bathelier et al.
Jourde Bernard
Laune Jean-Christophe
Wattel Jean-Rene
Asselin (Societe Anonyme)
Lesmes George F.
Shelborne K.
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