Non-marking seam in screen used for manufacture of nonwoven fabric
AssigneeE. I. Du Pont de Nemours and Company
InventorTheodore Duvekot
Life of this patent
Estimating the term…
Abstract
A seam of two ends of a rigid screen of interwoven longitudinal and transverse wires is made by butting and fusing together longitudinal wire ends at each end of the screen at the crossovers of the longitudinal wire ends with an adjacent pair of transverse wires forming the seam in one surface of the screen, whereby the seam is not visible from the opposite surface of the screen.
Claims6
A process for seaming into a closed loop a rigid screen composed of longitudinal wires and transverse wires interwoven with said longitudinal wires, the frequency of each said wires in said screen being no greater than 12 wires/cm, comprising
- (a) cutting said longitudinal wires to a length corresponding to the circumference desired for said loop, said cutting of said longitudinal wires at each end of said screen being such that
- (i) the ends of the longitudinal wires at each end of said length of screen can be butted together,
- (ii) there is one of said transverse wires at each end of said length of screen, which wires become an adjacent pair of transverse wires upon the butting together, and
- (iii) the butting together occurs at the crossovers of said ends of said longitudinal wires with said adjacent pair of transverse wires in one surface of said screen, whereby the butting together of said longitudinal wires is not visible from the opposide surface of said screen,
- (b) butting together the ends of the longitudinal wires of each end of said length of screen to thereby form said length of screen into a closed loop, and
- (c) forming a seam of the butted ends of said longitudinal wires in said one surface of said screen which is not visible in the opposite surface of said screen by fusing said butted ends together.
A rigid screen having its ends joined together by a seam, the screen comprising longitudinal wires interwoven with transverse wires, the frequency of each said wires in said screen being no greater than 12 wires/cm, said seam comprising an adjacent pair of transverse wires and the longitudinal wires butted end-to-end and fused together at the crossovers of the ends of said longitudinal wires with said adjacent pair of transverse wires in one surface of said screen, whereby said seam is not visible from the opposite surface of said screen.
In a process of impinging streams of fluid against a fibrous web supported on a rigid screen composed of longitudinal wires and transverse wires interwoven with said longitudinal wires passing beneath said streams to form an aperture patterned nonwoven fabric of said web, the longitudinal wires running in the direction of passage of said web beneath said streams and the screen being seamed into a closed loop, the improvement comprising conducting said impinging wherein said screen has its ends joined together by a seam, the screen comprising longitudinal wires interwoven with transverse wires, the frequency of each said wires in said screen being no greater than 12 wires/cm, said seam comprising an adjacent pair of transverse wires and the longitudinal wires butted end-to-end and fused together at the crossovers of the ends of said longitudinal wires with said adjacent pair of transverse wires in one surface of said screen, whereby said seam is not visible from the opposite surface of said screen and said web is supported on said screen, whereby the presence of said seam in said screen is not visible in the apertured pattern in said fabric.
Dependencies are inferred from the claim text.