US1616222A - Fourdrinier-wire screen - Google Patents

Description

Feb. 1 1927. LMQZZ H. R. HARRIGA'N FOURDRINIER wm scREEN ATTORNEYS Pewien Fenriszv.

terezzz n. 'Hennrenrn or sonrn nnnrnr, messncnnsn'rrs, nssronon ro Annex- M WBITING' PAPER CMPANY, OF HOLYOKE, MASSACHUSETTS, .tli CORPORATION .GE NEW mwmw.,

EUERINIERPWIBE SCREEN.

Appltcetion flle May 18,19%. eriel It'o. 561,8W.

rli'his invention relntcs to en improved Fonrdrinier Wire screen tor use in paper making machines end hns for its o'hject the p incorporetion in snch e screen, ot means for o watermarking the paper during the process ot its menufecture.

'li`he common practice hereto'iore tor Watermerking paper, hes been by nieans ot o dendy roli rotnting in contact with the surface ot the paper being carried vupon the Fonrdrinier Wire, `"which dandy roll usnelly carries o screen with nppropriete .mnrkmgs therein for Verying the denslty of the paper nt certain portions thereof during its menu- W focture. The use .of suchl dnndy rolls tor Weterinerking pnper is confined to papers of the hettor grnde, tor the reeson thnt the action of the dendy roli requires that the `peperghe run through the mnchine at e slow wrote ot speed ns compared' with the speed of running the mnchine in the mnnutecture of chenper papers.. p lin order theretore', to' enehle peper menufaotnrers to wetermnrh their cheaper grndes w oipepere With some npproprinte inerh which willi identit their 'product9 i here olevised' menns Whic cen he incorpornted directly in the Fonrdrinier mehingi Wire for cnusing" the Veriehle density in the peper nhove ciescrihed, und which will not in eny way limit the speed in which the machine con he min in the ranking of cheep paper. The idee thus conceived mny'he carried out in difierent weys hy vnrying' the weere ot the hlourdrinier Wire tehric so es to crente :tones thereiniof difierent drainage cepncitj' tor the removnl of the rnoisture of 'the pnip. As is well lrnown, the density of theditl'erent portions of the paper being f forrned on the screen Wili hereried in 'sof- 'cordnnce with thegrenter or iess dreinege capacity nt d'i'derent portions of the rnnlring screen, end in creating such zones ot ldiiien ent dreinege capacity on the Fourdrinicr Wire screen, the object is nierely to very i the dreinnge enoughl to weterrnerirthe pnpcr end Without ynpprecinbiy Weelreningg; its strength nt said Wnterlrnn-rlred portions. before'steted9 the creetion in the ti'ourdrinier Wirescreen ot such local erees of reeter or less dreinege they be accomplished y a suficient Variation in the weeve of said Fourdrinier screen. More eleloorate figures for Wetermeriring paper inny be incorporated in the lFourdrinier Wire screen by Weaving the same in pattern controlled or decquerd looms. F or illustreting the hronol idee of the invention, E have shown e few simple forms ot changing the Weeve in seid Fonrdrinier Wire suflicient to creete the local zones ot difierent dreinnge capacity which will result in Watermsrking the paper during its mnking.

Reierring to the drewings which show such e simple embodiinent of the invention- Fig, 1 is e plon ot n portion of n Fourdrinier Wire screen in Whichet intervnls the Weft wires end the Warp wires nre spaced ferther apartA then the normal specing ot seid wires in the body of the ielbric;

lFig. 2 is n deteii section enlarged .of e portion of said iahric showing the iorinntion ot the paper thereon;

Fig. 3 is o plon of a portion of n Four-i drinier Wire screen showing enother method of changing the wenve therein in which, at intervels throughou't, is incorpornted o much henvier Wett Wire end n much heevier Warp Wire then themein wires of. the ehric;

Fig. t is n deteil section eniarged show-' ing the peper being tormed on the Wire screen of Fig. 32;

Fig. 5 is o plon ot still another form ot n Fonrdrin'ier Wire screen in which et intervels throughont, the Werp wires nre spaced ierther sport than the normal specingot said wires end in which nt interrels heevier Warp wires end heevier Wett wires then the main wires oii the iehric ere incorporoted; end

iiig. t is en enlerged section ofpeper being' orrned on the Wire ot' Fig. 5.

Reterring'more perticulerly tothe drew' ings, the mein Warp wires with 'which the Fonrdrinier Wire tehric is 'Woren is indi 'ceted et lt end the wet't wires nt 2. in the weering of 'thetaoric shown in Fig. i, the

We'it Wire hits ioeen ornitted et interveis to tltl create sp'aces 3, and 4: and at interval's the, Warp wires have likewise been. omitted tol `w1re fabric of F1 s. 1, 3, and 5 will be createspaces, 6 and as shown.

The Fourdrinier wire screen in Fig. 1 Will therefore have at the spaces 3, 4, 5, 6, and 7 a greater drainage capacity for removing the water from the pulp in the formation of the paper thanthe closer mesh in the main body of the fabr'ic. The intersect-ion of the spaces 3 and 4 with the spaces 5, 6, and 7 which are indicated at 8, 9, 10, 11, 12 and 13 will have a still greater drainage capacity as will be obvious. The paper being formed on such a Fourdrinier Wire screen as shown in Fig. 1 will consequently be thicker at the spaccs above indicated and will be less impervious to light at these local zones, j thus giving what is known as a watermark to the paper. In Fig. 2, an attempt is made to illustrate the different density of the paper as it is ormed on the wire screen of Fi'. 1. rl`he paper or pulp indicated at P will be drawn through the screen to a sli htly 'greater extent at the zone space 5 t an through the close mesh of the remainder of the screen, and thusresultin being more thickly formed at this area.

In, Fig. 3 ll have shown heavier Warp wires 1d and heavier wett wires 15 woven into the tabric at spaced intervals, and by heavier-wires, l mean, 'heavier than the main warp and Weft wires of said Fourdrinier Wire screen. rlhe employment of such heavier waropand weft wires will produce a slightly less drainage capacity tor the tabric at the areas adja'cent said hearier wires which will result in the paper being formed of slightlyless density at said areas. By reference to Fig. 4 which shows a section ot the paper being tormed onthe Wire screen of lFig. 3 it Will be observed that the aper is thinner or of slightly less density adyacent .the heavy wire 14 than above the other wires of said fabric, due to the dccreased drainage capacity oi said iahric adjacent said heavier wires.

5 illustrates a Fourdrinier Wire mal;- ing screen which embodies a combination ot the means shown Figs. 1 and 3 :tor varying the drainage capacity ot said mal:- ing Wire En this view the wett wires 1 ale spaced apart at intervals to form the spaces.

5 and 7 for increasing the drainage capacity at such areas, and heavicr Warp wires illand heavier weft wires 15 are liitewise woven into the fabric at intervals to decrease the drainage capacity ot the iabric adjaicent said heavicr wires.

Fig. 6 ilinstrates the iorination of the paper on such a making'wire as shown in Fig. 5 wherein it will be seen that the pa-' per is iormcd slightly thinner adjacent the heavicr 'Warp wire 1d and slightly' thiclrer in the space area 5 between the normal Warp wires Itwill be obvious to those skilled in the art that the paper made on the Fourdrinier for-med with a di erent density at certain zones which will not ordinarily be observable in the paper unless the same is held to the light, in which case, there will be exhibited a plaid-like marking in the paper of the same nature as a, watermarlr heretofore formed by a dandy roll. Inasmu'ch as 'the making wire has incorporated directly in it the means for thus watermarlring the paper, it may be used in the paper making machine in the same manner as the ordinary Fourdrinier Wire screen and can be run at the desired speeds tor the making of both cheap and better grade papers.

In other wordaahourdrinier Wire screen ot' this Character may be'employed to watermark any paper made thereon and its speed ot' operation in the paper mam'ng machine is not inany way limited by the feature of having incorporated therein means :tor vwaterniarking the paper. 'the value ot this improvement will be appreciatcd by all papermanuiacturers who clesire to watermark their cheaper grades ot paper and have heretofore found it impossible to do so by reason of the diflicuity in employing a dandy roll when the paper making machine is run fast enough to get the production necessary tor cheap paper. lt has been found that in attempting to use a dandy roll for watermarlring paper on a making screen run at high speed in the production ot cheap papers, the dandy roll rolling in, contact with the paper pulp on the making screen does not'have time to :function properly tor watermarking the paper, and moreover, has a tendency to pull the pulp od the making screen. Such dificulties are avoided by the use ot a making screen in which the means for watermarlring the paper are Ahicorporated directlv inthe making screen as heretofore described0 What l clairn is:

i. A, Fourdrinier woren Wire ahric or paper making having means in'corporated therein i'or watermarlring paper during the making oi the paper which means comprises watermarlring ,portions 'frrrned in said Wire :iabric to vary the densitr ci the paper to be :tormed at said waterniariring portions suit- -iicicntly to watermarlr said paper without weairening the strength the paper said portions.

,A Fourdrinier woven Wire ;tabi'ic for paper making having means incorporated therein tor waterniarking paper during the making ot the paper which means coinprises watermarlring portions iformed in said wire tabric by varying the weave thereotq at said portion so as to vary the density of the paper to be 'Eornied at said watermarking portions sutficiently to 'withlltl out weakening the strength of said paper at said portions.

3. A Fourdrinier woven wire fabric for paper making having means incorporated therein for watermarking paper during the making of the paper which means comprises Watermarking porti'ons formed in said o Wire fabric of Closer or more open mesh thanx the main body of said Wire fabric so as to vary the density of the paper to 'be formed 10 at said watermark'ing portions sufficiently to Watermark said paper without Weakening the strength of said pa )er at saidfportions. In testimony whereoi 'I' have aflixed my signature.

HERMAN R. HARRIGAN.

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