US90497A - Improved composite paper for hangings and for other purposes - Google Patents

Description

' strips of greater strength being produeed in the prothat giatfg WELLINGTON CAMPiELLQOF MILLBU'RN, NEW JERSEY.

Latte/rs Patent No. 90,497, dated May 25, 1869.

IIWPROVED COMPOSITE PAPER FOR HANG-INGS AND FOR OTHER PURPOSES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

Be it known that I, WELLINGTO, ,OAMPBELL, of Millburn, in the county of Essex, a dBtate of New Jersey, have made an invention of a new and useful article of manufacture, which I denominatc .Composite Paperfl and 1 do hereby declare that the following is a full, clear, and exact description and specification of the same.

It is well known that paper curtains, paper hangings, and sheets of paper for other purposes, are much more liable to be torn or frayed at the-edges by handling than .at the intermediate portion, and various means have been devised of obviating the defect.

The object 'of my invention is the production, at a low cost, of paper which is less liable to the abovestated defect than other papers of the same average weight per square foot. To this end,

My invention consists of a paper, one or more lon gitudinal strips or portions of the breadth of which are of greater strength. than the adjacentstrips, the

while still moist, to the final pressure applied to paper previous to drying it. In this case, the doubled portions are eomposed,necessarily', of the same quality of material as the intervening portion, but are of double weight for the same area of surface, while, by the systemof manufacture first above described, the strengthening-strips of paper material may be formed either of the same material as the residue, or of a stronger, or of a weaker material than the residue. of the paper, a stronger material being, in ,my opinion, preferable, the difference of material being efi'ecteel by causing the supplementary wire-clothed cylinder to revolve in a tank ofpaper-pulp distinct from that from which pulp is taken for the formation of the main sheet.

Another mode of producing my invention is to combine the two systems of manufacture above described, the sheet of pulp being first doubled, at or near the edges, 'by the application of the supplementary ribbons or strips of d'amp material,. and then being doubled, while wet or damp, a second time, the turning over of narrow strips at the edgesupon the intervening portion, and the whole being consolidated by pressing the strips and sheet together.

The paper thus produced may be dried in the usual manner.

In some cases, I propose to increase the strength of the sheet of paper by introducing one or more threads between the two thicknesses of paper mz-zterial. In this case, the thread may be conducted to and laid in contact with the sheet of paper material, at the desired place, before the strengthening-strip is applied to said sheet, so that, when the said strip is applied, and consolidated by pressure, the thread is enclosed between the two thicknesses. Having thus described the several modes in which I have contemplated the application of the principles of my invention, declare that I am well aware that sheets of paper have long prior to my invention been strengthened by pasting strips of paper upon the edges of such sheets, and also that entire sheets of paper have been doubled throughout in the process of man'- ufacture, by combining two sheets of wet paper-pulp together. I therefore do not claim broadly adoubled paper; but

cess of manufacture, by doubling the material at such strips, and the whole being united by the felting or interlocking of' the material, and being consolidated by pressure, so as to constitute a composite sheet of paper.

My invention may be produced in several ways. Thus, in the process of manufacturing the paper, one wire-clothed cylinder, or one belt in wire cloth, may be used to produce a sheet of paperepnlp, or paper material, in the ordinary way, as practised with a cylinder-machine, or with a Fourdrinier machine. Simultaneously with the production of the said sheet, a supplementary wire-clothed cylinder, having one or more narrow bands of wire cloth at its barrel, may be employed to produce one or more stripsor ribbons of paper-pulp suitable for doubling the sheet of paper at the places where greater strength is required; as, for example, two bands of wire cloth may be used to pro-' duce two strips of paper material for strengthening the edges of the sheet; and these two strips may be conducted to, and laid in contact with the edges of the said sheet previous to couchi'ng and pressing it, so that the operations of couching and pressing cause the contiguous faces of the damp or wet sheet and strips to unite, as by felting, without the necessity of VVh' t I claim as my invention, and desire to secure employing any glutinous material to stick the two toby Letters Patent, isgether. A paper having adjacent strips of its breadth of.

The compound sheet of paper thus produced may different strength, each strip of greater strength being be dried and t rimmed in the usnal manner, and will produced by combining, with the damp sheet of paper he found to possess the characteristics of my new material, a damp strip of paper material of the remanuiacture, the edges being doubled in strips, and qnired breadth, and by consol'dating the whole by pressthe doubled parts being firmly irnited by the interme, the article produced constituting a new article of lock ng of the contiguous parts, while the intervening manufacture. portion of the sheet is of lightenweight and strength, In testimony whereof, I have hereto set my hand,

Another mode of producing myginvention is to form this 14th day of April, A. D. 1869.

a sheet of papermaterial in the usual manner, to WELLINGTON OAMIBELL; couch it and to press it partially, so as to impart to it v some consistency; then to turn ever narrow'strips at Witnesses: the edges of the sheet upon the interve-ning portion, W. O. WITTER,

and tdsubject the sheet so doublemat the edges, and W. L. BENNEM.