GB1100908A - Process and apparatus for producing an extensible web material - Google Patents

Abstract

1,100,908. Shrinking fabric and paper. CLUPAK Inc. 30 April, 1965 [28 July, 1964], No. 18307/65. Headings D1S and D2A. Apparatus for compacting a web 40 comprises first and second blankets 22, 34 having closed paths of travel, the outer surfaces of the blankets 22, 34 having a portion of their paths of travel in surface to surface relation, a non- rotatable pressure rod 20, 21 within the closed path of each of the blankets 22, 34, which rods 20, 21 are positioned with respect to the blankets 22, 34 to form a nip 35 therebetween, the nip 35 being at a predetermined oblique angle to the direction of travel of the blankets 22, 34, the blanket 22 having a wrap on the rod 20 in one direction of curvature and on the rod 21 in the opposite direction of curvature, and means for feeding the web 40 into the nip 35. The blanket or belt 22 has a deformable surface and may be formed of natural or synthetic rubber. Preferably, it has a strong relatively inextensible layer faced with a readily extensible and contractible layer. The rods 20, 21 extend obliquely across the direction of travel of the blanket 22 and are adjustable towards and away from each other to properly nip the blanket 22 therebetween. The blanket or belt 34 is inelastic, has a low coefficient of friction and is thinner than the blanket 22. Rods 30, 31 are disposed at twice the angle relative to the blanket 34 than the rods 20, 21 are disposed relative to the blanket 22 so that the blanket 34 is directed into the nip 35 in a direction normal to that at which the rods 20, 21 are disposed. The web 40 is passed onto the blanket 34 at a point 41 and is carried over a rod 32 by this blanket. As the blanket passes under the rod 30, the web passes under the rod 31 to eliminate a speed-up thereof. The web 40 passes into the nip 35 and is shrunk in a direction at an oblique angle to the cross-machine direction. Lubricant, e.g. a silicone-water solution, may be directed into the nip area to lower the coefficient of friction between the web 40 and the blanket 34 and to cause a softening of the fibres of the web. In a modification (not shown), the web 40 passes directly into the nip 35 and is not carried thereto by the blanket 34. The web (71), Fig. 9 (not shown), may also be shrunk in the machine direction, as well as at an angle thereto, by a unit (70) as described in Specification 727,261 prior to or after the oblique shrinkage.