US1674980A - Newsprint paper - Google Patents

Description

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martian M74380 PATENT QFWQE,

"WILLmElI H. MILL SPAUGH, F SANTDUS KY, OHIO, ASSIGNOIB. TO THE EAFER & TEXTILE MACHINERY COMPANY, OF SAND'USKY, @HIO.

NEWSPBINT PAEEB.

No Zirawing. original application filed January 3, 1923, Serial No. 610,538. Divided. and. this application filed April 4, 1927.

Paper on which newspapers and other similar cheap publications are printed 18 a medium light or light weight paper made from comparatively cheap stock. The stock now commonly used for newsprint paper is largely ground .wood pulp fortified by sulphite or other stronger pulp 1n a proportion usually ranging from about 20 percent sulphite down to as low as 10 percent sul-n 10 phite, although in some instances newsprlnt papers have been made without any sulphite where a special ground wood stock was properly prepared. The present standard weight for newsprint paper in the United States is 32 pounds per ream (500 sheets, size 24" by 36"), with a range of from 31 to 33pounds; though of course such paper may be made in lighter or heavier weights. In Europe newsprint paper is made in weights as light as pounds per ream. What is'practically a lighter newsprint paper, made from the same kind of stock with only a little more sulphite, is that known as news catalog, which is used for cheap catalogs such as those published by mail order stores, and which is made in weightsv ranging from 19 pounds to 25 pounds per ream.

I produce paper of the aforesaid class made from the same stock as the ordinary such paper would be made, and without in any way changing or affecting the stock I obtain a better paper which in comparison with ordinary such paper of the same thickness and composition is materially stronger so that it is better adapted for use in high speed printing presses, or in other words may be run through such high speed print- Y ing presses without danger of breakage or with considerably less liability ofbreakage. This greater stren h is obtained'by a laminated structure 0" the sheet of newsprint or similar paper,,the sheet being made by simultaneously forming from the stock continuous thin wet paper films and welding these filmsin a unitary sheet of no greater thickness than the sheet would ordinarily be made; For instance, in making newsprint paper of the ordinary composition and thickness of United States standardweight newsprint paper, I produce from the ordinary newsprint stock two continuous wet films or sheets of half the thichiess that the wet sheet would be for making the ordi- Serial No. 181,003.

nary such paper and bond these together as a single sheet, thereby obtaining the strengthening effect of the laminated formation and resulting in a newsprint paper of ordinary thickness andcomposition'but which may be safely run throu h high speed printing presses without brea age and which also has the advantage of better edgmg.

The paper may be made by flowing the ordinary pulp solution against cylindric c5 forming surfaces provided by suitable mediums such for instance as fine wire cloth traveling on or over suction rolls and inducing the formation of the thin paper films or plies on the mediums by suction, reducingthe moisture content of the films or plies by suction, preferably regulated to bring the sheets to the best moisture for good bonding, i. e. containing ample water for bonding purposes but not .an undesired excess of water, carrying the sheets by said mediums into contact with one another and bonding them in a unitary sheet and then pressing the sheet and delivering it to dryers. Processes and apparatus by which the paper may be made are described in .my copending applications Serial Nos. 610, 538 and 610,539 filed'January 3, 1923 and Serial No. 529,600 filed May 11, 1925, this application being a divisionof the first mentioned application. In said pending applications the processes and means therefor herein described are broadly claimed.

Among other advantages of the duplex newsprmt paper, is that it may be made of co lighter weight per ream of a given furnish than ordinary newsprint paper. By furrush is meantthe kind vof stock and percentages thereof which go into the heaters.

Newsprint or similar paper according toes this invention made from a given furnish will be as strong as athicker or heavier sheet of ordinary such paper made from the same furnish, or as strong as ordinary; newsprint paper of similar weight made" me from more expensive stock. Thus for a desired strength a cheaper furnish may he used and a lighter paper made than would be necessary for the ordinary newsprint or similar paper of such strength.-

1 claim as my invention and desire to secure by Letters'latent:

1. As a new product, newsprint paper i0 bonded in a unitary sheet.

made of ordinary stock and thickness but .3. Newsprint 01 similar of greater strength than ordinary news rint the same stock as {of paper by simultaneously forming wet s eets ness than ordinary i'eueli of half the thickness of the ordinary wet strength w0u1d'-befmade,i 6 sheet; and consolidating them as a single integrated separatelyforme;ph

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sheet, thereby obtaining the st ngthening 4. Newsprint oifsimilai f iiaper' of Iam'i a efiectpf a laminated; formation; natedformation. a l 1 .2. New rint; or similar aper composed In testimony whereof, I have signed. my of origina lys'eparately ma e or plies name to t is speclfication.

C a WILLIAM H. MILLSPAUGH.