US1959956A - Method for imparting elasticity or strength to paper or fabric - Google Patents

Description

May 1934.

METHOD FOR IMPARTING ELASTICITY OR STRENGTH TO PAPER OR FABRIC 2 Sheets-s 1 Filed April 6, 1932 i. I E===ES I NVENTQR.

H. JACKSON May 22, 1934.

METHOD FOR IMPARTING ELASTICITY OR STRENGTH TO PAPER OR FABRIC Filed April 6, 1952 2 Sheets-Sheet 2 INVENTOR Patented May 22, 1934 METHOD FOR IMPARTING ELASTICITY R STRENGTH T0 PAPER QR FABRIC Harold Jackson, Garstang, England Application April 6, 1932, Serial No. 603,601 In Great Britain April 21,, 1931 3 Claims. (oi. i5i 3s) This invention relates to a method for treating webs or lengths of paper or fabric to secure elasticity or stretch crossways on the web of paper or fabric by means of pleats or crinkles running 5 lengthways of the reel or length.

A paper has long been known which is crinkled transversely as it leaves a drying cylinder giving it stretch in a longitudinal direction.

To secure longitudinal pleating 0r crinkling on a reel or web of paper or fabric without impairing its strength to a serious extent it is essential that the edges of the web must converge i. e. the web becomes narrower under treatment to the full extent of the length of paper taken up in the depth of the several corrugations. Thus if of elasticity or stretch, is required, the width of Web after treatment must be approximately 20% less than before treatment. The stretch or elasticity thus corresponds with the amount the web 20 is narrowed and a greater or less stretchor elasticity may be obtained by a greater or less narrowing of the width of the web.

It has been proposed to secure stretch or elasticity crossways of a paper web by passing the web between two plain elastic belts which are allowed to contract from the feed to the delivery end but a web so treated crinkles unevenly some of the crinkles or creases being much larger or wider than others.

The method according to the present invention consists in providing a positive crinkle 0r corrugation in the paper web by passing it between two elastic longitudinally ribbed belts, expanding the belts transversely at the feed end to flatten out the ribs and allowing them to contract pro- --gressively to the delivery end whereby the web is narrowed and constrained to crinkle uniformly being pressed by the ribs of one belt into the grooves in the other.

In carrying out the invention the requisite narrowing of the web is obtained by passing it, preferably in a moist condition and preferably as it leaves the rollers of the paper machine before drying between two elastic ribbed belts, the ribs on one belt entering the grooves on theother whereby the web is progressively narrowed and crinkled uniformly throughout its width.

The'invention will be fully described with reference to the accompanying drawings:-

Fig. 1 is a plan'of apparatus. Fig. 2 is an end view of feed end. Fig. 3 is an end view of delivery end. 1 Fig. 4 is a longitudinal section on line 4-4 of Fig. 1.

The aparatus comprises two rubber or elastic ribbed belts A, A1 with upstanding ribs a and alternating spaces or grooves (11 capable of being expanded or drawn out laterally to extend or widen the spaces or grooves a1 and reduce the, ribs 11 until the surface is approximately fiat or smooth.

The bands A, A1 are gradually expanded laterally from the delivery end towards the feed end where the web of paper enters between them by stenter clips on stenter chains B until they are approximately flat and contract again towards the delivery end where the paper leaves them.

The damp paper enters between the two bands and rests upon the guides or ribs a and as it travels forward with the bands and they are contracted the paper is also gradually contracted in width and folded into longitudinal pleats or crinkles within the grooves a1 between the ribs or guides a.

' The web of paper is much narrower and has a crinkled or corrugated appearance longitudinally and it may be dried in this form or it may be first passed between rollers and. the corrugations lightly pressed into pleats or folds.

The hereinbefore described method of imparting stretch or elasticity to a length of paper or fabric may be applied to plain or flat, or to transversely creped or crinkled paper when being manufactured on the paper machine, or it may be applied to paper already made whether flat or creped or crinkled transversely so as to secure stretch or elasticity laterally or in both directions of the paper i. e.both length way and across, and in this case the crinkles in the paper will cross one another at right angles.

What I claim as my invention and desire to protect by Letters Patent is:

1. A method of giving a positive crinkling longitudinally of 'a web of paper characterized by passing the web between two elastic longitudinally ribbed belts, expanding the belts transversely at the feed end to flatten out the ribs and allowing them to contract progressively to the delivery end whereby the web is narrowed and constrained to crinkle uniformly being pressed by the ribs of one belt into the grooves in the other.

2. Mechanism for crinkling a web of paper longitudinally comprising two elastic ribbed belts, ribs alternating with grooves on the surfaces thereof, the ribs on one belt entering the grooves 101 onthe other when the belts are travelling in one direction, stenter clips gripping both edges of the belts by which they are stretched substantially flat at the feed end and allowed to contract progressively to the delivery end, and converging travelling eflxed.

chains to which the stenter clips ere 3. Mechanism for crinlzling e web of paper longitudinally comprising 13 We elestie riloheol belts,

ribs alternating with grooves on the surieees thereof, the ribs on one belt entering the grooves on the other when the direction, stenter clips grip belts are travelling in one ping both edges oil the lllll

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