Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1996-12-24
1998-06-23
Vanatta, Amy B.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
28105, D04H 1300
Patent
active
057687560
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a perfected process for the manufacture of a light, unpatterned, non-woven textile cloth by the technique using pressured water jets. The invention also relates to a device for the implementation of said process.
U.S. Pat. Nos. 3,214,819, 3,508,308 and 4,190,695 describe a process for the manufacture of non-woven textile cloth in which the adhesion and interweaving of the elementary fibers are not achieved mechanically, but rather by use of a large number of jets of water under high pressure crossing a veil or cloth placed over a perforated support.
In a needle-like manner, the water jets, with a usual pressure of at least 30 bars, and sometimes 100 bars or more, cause the interweaving of the elementary fibers, resulting in the cohesion of the obtained non-woven cloth. These non-woven cloths are known in the literature by the American term "spunlace cloth" or "spunlace". It is not, therefore, necessary to describe here in detail this technique for hydraulic interweaving.
In broad terms, the technique consists of first producing a base cloth formed of elementary fibers. The fibers of this cloth are then intermingled in movement over a continuous perforated sheet by means of a row of adjacent high-pressure water jets (50 to 200 bars). The water from the jets crosses the cloth and is repelled back onto the sheet. In this manner, the combination of direct and deflected jets creates turbulence which disturbs and then arranges the elementary fibers. In order to achieve efficient interweaving, the continuous sheet is usually made from metal or polyester, with porosity of between 15 and 25 percent.
In FR-A-2 488 920, it was suggested that the continuous perforated sheet base for the elementary cloth be replaced by a number of smooth, water-impermeable, rotating cylinders, for example, of stainless steel. However, this solution is inconvenient in that it limits the speed of the water jets and hence the interweaving energy, since it becomes difficult to properly remove the water ejected from the jets. Moreover, this technique results in the appearance of numerous defects on the surface of the cloth produced.
In U.S. Pat. No. 3,485,706, it was proposed that the sheet be replaced by a rotating drum perforated with a large number of holes approximately one millimeter in size, organized in an appropriate pattern, parallel or staggered. Such a replacement enables the production of cloths with a center pattern corresponding to that on the drum. However, the fact that these holes are arranged in an ordered manner results in the well-known problem referred to shadow marking," i.e., the appearance of preferential lines on the finished cloth. In order to limit shadow marking problems, it is necessary to reduce the jet pressure, thus considerably impairing the efficiency of the process and lowering the mechanical performance of the product. Equally, if pressure is maintained, the cloth rapidly declines in quality.
SUMMARY OF THE INVENTION
The present invention solves the above-mentioned inconveniences. It is a broad object of the present invention to overcome the above disadvantages and to provide an improved process for manufacturing a non-woven, unpatterned cloth textile using pressured water jets, and also to provide a device for carrying out this process.
The invention therefore provides a process for the manufacture of non-woven unpatterned cloth using pressured water jets, comprising passing a base cloth made from elementary fibers over a perforated rotating drum, a partial vaccum being applied within said drum and the surface of said drum being provided with a large number of micro-holes; and directing a row of said pressured water jets at said rotating drum bearing said cloth, the micro-holes of said drum being distributed in a random manner.
In other words, the invention comprises the employment of a rotating drum supporting the cloth and provided with a large number of micro-holes distributed in a random, rather than an ordered, manner. The term "in a r
REFERENCES:
patent: 3214819 (1965-11-01), Guerin
patent: 3485706 (1969-12-01), Evans
patent: 3508308 (1970-04-01), Bunting, Jr. et al.
patent: 3750237 (1973-08-01), Kalwaites
patent: 3800364 (1974-04-01), Kalwaites
patent: 4691417 (1987-09-01), Vuillaume
patent: 5414914 (1995-05-01), Suzuki et al.
ICBT Perfojet
Vanatta Amy B.
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