Textiles: manufacturing – Textile product fabrication or treatment – Cross laying by divergent thread conveying members
Patent
1991-06-20
1994-04-12
Crowder, Clifford D.
Textiles: manufacturing
Textile product fabrication or treatment
Cross laying by divergent thread conveying members
19300, 19163, D04H 305
Patent
active
053013999
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a process of detecting and compensating position errors occurring during the manufacture of a web consisting of a multilayer non-woven fabric by means of a laying machine, in which a web consisting of a monolayer non-woven fabric is supplied to a conveyor belt (hereinafter called delivering belt) transversely to the direction of travel of said belt and is laid onto said belt by a reciprocating motion to form a multilayer web and the thickness of the multilayer non-woven fabric and/or its mass per unit of area is continually measured.
The process is carried out in a laying machine, which comprises a conveyor belt, which serves to supply a web consisting of a monolayer non-woven fabric and which is deflected at its leading end around a roller, which will be described hereinafter as a laying roller, a motor for driving the conveyor belt, a traversing drive for reciprocatively displacing the laying roller in and opposite to the direction of conveyance of the conveyor belt a delivering belt, which is disposed below the laying roller and extends transversely to the conveyor belt a motor for driving the delivering belt, and a measuring device for measuring the thickness and/or the mass per unit of area of the multilayer non-woven web.
In such a laying machine a web consisting of a monolayer non-woven fabric is supplied by a conveyor belt to a delivering belt which is disposed under the conveyor belt and extends transversely thereto. The for nd of the conveyor belt performs a traversing motion, that is, a reciprocating motions and after each reversal of the motion of the laying roller the monolayer non-woven fabric is laid onto the delivering belt in such a manner that the web partly overlaps that layer of the non-woven fabric which has been laid before the reversal of the motion of the laying roller. The degree of overlap will depend on the velocity at which the web consisting of the monolayer non-woven fabric is supplied and laid, on the velocity of the travel of the delivering belt, on the width of the non-woven fabric which is supplied and on the width of the non-woven fabric which has been laid in a plurality of layers. The latter width will be determined by the distance which is traveled by the laying roller during its reciprocating motion. Because the delivering belt is moved transversely to the conveyor belt and transversely to the laying roller, the web is laid onto the delivering belt in a plurality of layers, which obliquely overlap each other. The number of the layers and the width of the resulting multilayer non-woven web may be changed as desired by a variation of the width of the non-woven web which is supplied, the velocity at which the web is laid, the velocity at which the delivery is effected and the deflection of the laying roller. Incorrect settings may have the result that the layers do not adjoin without a gap or are not laid with a controlled, predetermined spacing. An "underlap" may occurs when the delivering belt is moved at an excessive relative velocity and gaps occur between the several layers. On the other hands an insufficient relative velocity of the delivering belt will result in an "overlap" because adjacent layers are laid one over the other.
If a multilayer web is desired which has a uniform thickness and a uniform density, an overlap or underlap will not be permissible but the laying machine must be operated with such a setting that the layers of the non-woven fabric formed by the monolayer non-woven fabric will exactly abut. Such webs consisting of a multilayer non-woven fabric on a woven textile backing are needed in paper machines as a covering on rolls in the press section and in the drying section of the paper machine. It will not be possible to make a uniform paper web unless the rolls are covered with a non-woven fabric or felt which has a uniform thickness and a uniform density. Very high losses may result from the operation of a paper machine in which a non-woven fabric or felt is used which is not uniform in thickness and den
REFERENCES:
patent: 3557351 (1971-01-01), Doering
patent: 4052239 (1977-10-01), Chen
patent: 4183985 (1980-01-01), Lemieux
patent: 4491831 (1985-01-01), Sakai et al.
patent: 4586372 (1986-05-01), Massen
patent: 4766649 (1988-08-01), Rudt et al.
patent: 4867087 (1989-09-01), Suzuki et al.
patent: 5107780 (1992-04-01), Braun
Crowder Clifford D.
Vanatta Amy B.
LandOfFree
Process of detecting and compensating position errors occurring does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process of detecting and compensating position errors occurring , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of detecting and compensating position errors occurring will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2090224