Textiles: fiber preparation – Assembling – Formed web
Patent
1995-02-27
1997-01-07
Calvert, John J.
Textiles: fiber preparation
Assembling
Formed web
226119, 2424173, 270 3003, D01G 2500
Patent
active
055904424
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a device for producing a nonwoven fabric made of fiber material with a web producer and a nonwoven fabric layering apparatus, which has an upper carriage and a layering carriage.
BACKGROUND OF THE INVENTION
Such a device for producing nonwoven fabric is known from German Auslegeschrift No. DE-AS 19 27 863. In the prior-art nonwoven fabric layering apparatus, there is a problem with web layering in the edge area of the layering width. The lower layering carriage must slow down its travel at these sites, come to a standstill, and then accelerate again in the opposite direction. The web coming from the web producer is, of course, fed to the nonwoven fabric layering apparatus at a constant speed. In the nonwoven fabric layering apparatus, the layering belts run at a constant speed, which causes the web to leave the nonwoven fabric layering apparatus at always the same speed. However, in the edge areas, where the lower layering carriage has a lower speed due to the slowing down, stopping and then accelerating, more web is layered in the outside edges than in other areas of the layering width due to this difference in speed.
A further development of the nonwoven fabric layering apparatus is known from German Patent No. DE-PS 24 29 106. It claims to prevent the edge buildups by having travel movements of the upper carriage and layering carriage being uncoupled from one another and being separately adjustable. Auxiliary carriages are then provided as well in order to compensate for the resulting differences in length of the layering belts. The traveling speeds of the upper carriage, the layering carriage and the auxiliary carriages must then support one another in a certain ratio. This requires a considerable expense for construction and control. Besides, the complicated kinematics impedes the adjusting of different operating conditions of the nonwoven fabric layering apparatus for adaptation to different types of webs or web producers.
BACKGROUND OF THE INVENTION
The task of the present invention is to design a device for producing a nonwoven fabric, and in particular to a device that makes it possible to influence the web layering and the nonwoven fabric formation in a simple and easily controllable manner.
In the present invention there is a web producing means which generates a nonwoven web from a fibrous material. The web producing means produces this nonwoven fiber at a substantially constant rate. A layering apparatus or means receives the web and lays the web down, usually in an alternating pattern. The layering means usually has a set of layering belts for receiving the web, and a layering carriage for discharging the web in the alternating or reciprocating pattern. Because of the movements of the layering carriage, a take-up carriage is provided to compensate for the changing length in the layering belts. A web storage means is positioned between the web producing means and the layering means. When the web producing means produces the web faster than the layering means discharges the web, the web storage means can absorb the excess portions of the web. Likewise when the layering means discharges the web at a higher rate than the web producing means, the web storage means can release additional portions of the web stored in the web storage means.
According to the present invention, a web storage means that has a variable storage volume is arranged between the web producer and the nonwoven fabric layering apparatus. With a corresponding storage control, the web layering and the nonwoven fabric formation can hereby be specifically influenced. Edge buildups of the nonwoven fabric can especially be prevented in a simple manner and without auxiliary carriages or similar design interventions in the nonwoven fabric layering apparatus. However, with the web storage means, the web layering can also be influenced at other sites of the layering width, as specifically more or less web is layered at certain sites, and thus, the thickness of the nonwoven f
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Hirschek Herwig
Schaffler Manfred
Autefa Maschinenfabrik GmbH Augsburg
Calvert John J.
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