US1863707A

US1863707A - Multiply paper sheet

Info

Publication number: US1863707A
Application number: US485300A
Authority: US
Inventors: Sr Charles De Lorman Wood
Original assignee: GRASSELL CHEMICAL Co
Current assignee: GRASSELL CHEMICAL Co
Priority date: 1930-09-29
Filing date: 1930-09-29
Publication date: 1932-06-21
Anticipated expiration: 1949-06-21

Description

June 1932- C. DE L. WOOD, SR

MULTIPLY PAPER SHEETS Filed Sept. 29, 1959 IN VENTOR.

(Aw/e165 pine/Wm New .52

ATTORNEY.

atented dune 2T, 1932 H l: LES DE LORMAN WOOD, SR., OF LAKEWOOD, OHIO, ASSIGNOR TO E GRASSELIIL CHEMICAL COMPANY, 015' CLEVELAND, OHIO, A CORPORATION OF DMAWARJE MuL'rrrLY earns. smear Application filed September 29, 1930. Serial No. 485,300.

My invention is directed to multiply paper sheets useful in the manufacture of containers, for insulating or other purposes wherein a high grade, strong multiply sheetis desired, and it comprises multiply 'paper, or board, in which sheets of diflerent COIISHLIC- tion are combined. I

By construction of the paper I refer to the method or tiype of paper machine used to produce it. W0 main types of construction of paper are known.

Tn the'older, cylinder machines, a paper is produced in which the individual. fibres are laid substantially in one direction only, parallel to the run of' the sheet, resulting in a product which has a different strength in various directions and by a tearing test one can easily distinguish a paper made on a cylinder machine.

The operation of a cylinder machine involves super-imposing several layers, usually up to 6, of pulp stock, which blend into a single sheet or board; each layer may have incorporated in it different sizes and pulp stocks, etc., but in all layers the fibres will.

have substantially the same direction. Any desired thickness of paper or board, practically up to 0.08" oreven more, can be made directly on 'a cylinder machine.

The other type of paper differing in construction from cylinder paper is obtained in what is known as a Fourdrinier paper forming machine. The fibres in the Fourdrinier paper lay in all possible directions, whereby a paper of uniform strength is obtained. The

thickness of a paper which can be made on a Fourdrinier machine is practically limited by t'ie speed at-which such a machine can be run economically. and it seldom exceeds 0.018". Another distinguishing feature of the Fourdrinier paper is that any size or waterproofing agent added to the paper stock will be distributed equally and uniformly throughout the whole mass of the paper.

In the practice of my invention I combine one or more cylinder sheets with one' or more Fourdrinler paper sheets, preferably alternating the two types of paper in laye s and joining the different plies by gluing them together with sodium silicate or other adhesive. The attached figure represents in-its simplest form applicants multiply paper sheet.

A. is a sheet of cylinder paper, B a sheet of Fourdrinier paper, 0 shows the adhesive which binds the two. A. corner of the oylinder paper sheet is shownbroken away to better illustrate the texture of the Fourdrinier sheet. The shading in the figure is intended to show the construction of the sheets, namely, that in the cylinder paper the individual fibres lay substantially all in one direction, whereas the fibres in. the Fourdrinier sheet, as seen on its surface and seen in profile, lay in all possible directions. The drawing represents the sheets greatly enlarged.

Multiply sheets consisting of alternating plies of cylinder and Fourdrinier paper can be produced in any desired thickness. They will show a considerable improved strength over similar sheets made from cylinder pa er I only. I believe this to be due to the fact that the cellulose fibres are distributed in the different sheets in different directions.

I am, of course, not limitedto multiply sheets consisting of one cylinder and one Fourdrinier sheet glued together, but I can use any number of such sheets.

My invention also provides for the possibility of sheets which have surfaces of different properties. One face of the sheetcan be of soft absorbent cylinder paper and the other side of a strong, hard sized, water resistant F ourdrinier sheet. Such sheets are particularly useful for making certain kinds of containers where the inside is treated to make it grease proof.

In another embodiment of my invention I produce a multiply sheet in which both surfaces consist of hard sized, water resistant Fourdrinier paper, withone or more soft, absorbent cylinder papers in between.

In the preferred embodiment of my invention I use unsized or only slightly sized cate of soda or other adhesive used, thereby roducing on the surface of the sheet a more concentrated adhesive and a quick initial set; furthermore, the absorbent cylinder sheet will continue exhausting the water from the adhesive until complete bond is obtained. Due to the strongly absorbent properties of the cylinder sheet the water of the adhesive will be preferentially absorbed by the cylinder sheet instead of by the hard sized, or water resistant Fourdrinier sheet, thereby substantially preventing migration of the water into the latter and preventing the attack of the sizing material contained therein.

-Multiply paper of my invention can be made on the machines commonly used for building up multiply paper and board, and their method of production differs from present practice only by the use of sheets of paper or board of different construction.

I cla1m:

1. A multiply paper sheet consisting of alternating plies of cylinder and Fourdrinier paper joined together by an adhesive.

2. A multiply paper sheet consisting of alternating plies of substantially unsized,

absorbent cylinder paper and hard sized,

water resistant Fourdrinier paper joined together with an adhesive.

3. A multiply paper sheet consisting of alternating plies of cylinder paper and hard sized, water resistant Fourdrinierpaper joined together with a sodium silicate adhesive.

4. A multiply paper sheet consisting of a substantially unsized, absorbent cylinder paper joined with a sodium silicate adhesive to a hard sized, water resistant Fourdrinier sheet.

5. A multiply paper sheet consisting of a substantial y unsized, absorbent cylinder paper lined on each face by a hard sized, water resistant Fourdrinier sheet, the plies beingjoined together with a sodium silicate adhesive.

In testimony whereof, I aflix my signature.

CHARLES DE LORMAN WOOD, Sr.