US1334796A - Compound board - Google Patents

Description

Cl G. ROBINSON.

yCOMPOUND BOARD.

APPLlc/mo N FILED JUNE I6, i919.

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UNITED STATES PATENT OFFICE.

CHARLES G. ROBINSON, OF BUFFALO, NEW YORK, ASSIGNOR T0 THE BEAVER COMPANY, A CORPORATION OF OHIO.

coMroUNn BOARD.

Specification of Letters Patent.

Patented Mar. 23, 1920.

To all fwzfomc't may concern.'

Be it known that I, CHARLES G. Roeien SON, residing at 183 Highland avenue, Bui" falo, in the county of Erie, State oi' New York, have invented certain new and useful improvements in Compound Board; and l do hereby declare the following to be `a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to compound board, and has for its object the provision oi" an improved compound board.

Compound or composite board,l such as the well lrnown Wall board of commerce, is ordinarily made up of two or more sheets or plies ot paper stock cemented together with an adhesive, such as silicate ol= soda. The plies of paper stock, usually about four plies, are suitably fed from rolls into the pasting machine, where the adhesive is applied and the plies i'orced together by compression, usually by passing the plies with a layer of adhesive between' them through compression rolls. The resulting composite board is then usually cut into panels oi' appropriate size.

rlhe paper stoclr` may be made trom Wood liber or Wood pulp, either ground Wood pulp or cooked pulp, used alone or intermiired, or trom waste paper or from any other suitable source of iibrous materials.Y

While the composite board may consist ot a single layer ot material ot' appropriate thiclrness, it is ordinarily built up of a plurality et layers or plies olf material, as hereinbetore described. Generally, it is marlreted in substantially rigid sheets or panels, and is used., generally, as a building material by nailing or taclring it directly to the studding et a room, so that it may serre in place olf lath, and plaster as 4the center rrall ed nuora, being usually orna mented with pair er the lilre, as desired.

llllall board, "c nurnutactured, contains a certain perceu `nroisture and also has the charnctenstrc oit chai e; in its mois ture content in accordance r th the humidity el the surwoundingm g these clr a tur but ne'rertl re content are n non but l d the lumber, particularly green lumber, gradually works through into the Wall board, causing expansion and sometimes warping and buckling. This liability of warping or buckling of the board is the greater and more pronounced, the'less rigid is the commercial product. For this reason, it is desirable that the finished board be as rigid as possible,and numerous expedients and instrumentalities have heretofore been practised or suggested in the commercial manufacture of Wall board for increasing or improving the rigidity of the product.

The present invention contemplates the provision of a compound board possessed of rigidity in a high degree. At the same time, this increased rigidity is secured With-` out sacriicing any of the other recognized advantageous properties oi commercial Wall board, such. as, for example, its lightness, its convenience of form and dimensions, its relative cheapness, etc. The invention in volves the provisionof a reinforcing member of reticular form interposed within. the body of the compound or composite board. Where the board is made up'of a plurality of plies of paper stock, the reinforcingI member may form an intermediate ply and in such cases is lpreterably embedded in the intermediate layer ot adhesive adjoining the two plies oit' paper' steelt adjacent the reinforcing member. llt desired, a plurality of intermediate plies or' reticular reinforcing members may be embodied in the composite board. l have tound inter` Woven wire, such as ordinary poultry Wire, 'well adapted as the reintorcin member lor the purposes ol the invention. ln gene "al, the reticular reinforcing member `will pret erably be ol metal, although other materials ca sable ol assuming1 reticular form and possessing the desired rigidity may, ot course, be employed. ln some cases en panded metal, and similaireticulated metah lic structures, may be used with advantage.

lnterwoven Wire, such as ordinary poultry Wire, is peculiarly advantageous tor the purposes oli the invention.. 'rt single layer or plyY olf such interwoven wire embodied in the ordinary tour-ply wall board oli commerce imparts to the product a substantial increase in its iplity without objectionubly increasing" i u, it or thiclrness. ln thAi muuu lacture oli the board, the :interwcr'en wire ltlll can be fed into the pasting machine from a roll thereof just as the sheets or plies of paper are fed 'into the pasting machine. Ordinarily, the reinforcing ply is preferably the central ply of the composite product, and thus in the case of the customary fourply board, the reinforcing ply of woven wire is embedded in the center of the structure with two plies of paper stock on' each side thereof. By the compression to which the plies of paper stock are subjected after being coated with lthe adhesive, the woven wire is pressed vor forced an appreciable distance into the contacting surfaces of the two adjacent plies of paper stock. The interwoven wire is completely covered with adhesive and is confined between two surfaces which ,re also covered with adhesive, and for this reason may be considered as embedded in the thin layer of adhesive which serves to unite or cement together the two adjacent plies of paper stock.

Paper stock, as it is ordinarily manufactured in the usual paper making machines, is composed of fibers which, generally speaking, extend longitudinally in substantially one direction. This result is brought about by the manner in which the sheets of paper are made in the ordinary paper-making machines. Thus, in the ordinary wood fiber paper stock from which the wall board of commerce is generally' manufactured, the fibers extend, for the most part, in one direction, and, on this account, the paper stock is more rigid and tenacious along one axis 1n its plane than along any other axis.

When such wood fiber paper stock is built up into composite board, the relatively weak axesl of each ply or sheet of paper extend substantially in the same direction, so that the resulting compositeboard is less rigid or weaker along one axis offits pla-ne than it is along any ther axis. This defect, resulting from the iatural tendency of the fibers to arrange themselves in substantially the same direction during the ordinary paper-making process, may very advantageously be overcome by a simple modification of the present invention. Thus, I embody in the structure of the composite board a reinforcing member of reticular form having greater rigidity along a particular axis of its plane than along any other axis, and I arrange this reinforcing member so that its relatively rigid axis is approximately transverse to the relatively weak axis of the plies of paper stock of which the board is composed. This result can be secured by forming the reinforcing member of relatively heavy parallel spaced wires joined by transverse wires of smaller gage or cross section.

In the accompanying drawings, I have illustrated, by Way of example, what I now consider to be the best embodiments of the invention. In these drawings,

Figure 1 is a perspective view, partly in section, of a compound board embodying the invention, and Fig. 2 is a perspective view, partly in sec tion, of a `compound board reinforced, in accordance with the principles of the invention, by an intermediate ply of interwoven wire.

Referring to Fig. l of the drawings, there yis illustrated a compound board made up of four plies or sheets of wood -fiber paper stock -5, fi, 7 and 8.

Intermediate the two inner plies of paper stock 6 and 7 is a reinforcing ply 9-10. This reinforcing member is of reticnlar form, that is to say, it is an open-work structure and more or less resembles a net.

The four sheets or plies of paper stock 5, 6, 7 and 8 have their fibers arranged generally along the axis a--ca As hereinbefore mentioned, this arrangement of the fibers is the inherent result of the process by which the paper stock is ordinarily made. Because of this arrangement of the fibers, the. paper stock, and hence the resulting composite board, can be more easily bent along the axis -a, than it can, for example, along the axis b-Z). This inequality in the rigidity of the board along all axes is overcome, in accordance with my present invention, by making the component parts er strands 9 of the reinforcing member of heavier and more rigid material than are the component parts 10 of the reinforcing membertI As will be seen by reference to Fig. l of the drawings, the h avier strands S), which may be of wire, extend along lthe axis Z/-b, while the relatively weaker and less rigid strands 10, :which may be of thin braided wire, extend along the axis ewa.. The braided or twisted strands l0 are suitably secured to the more rigid strands 9 in any appropriate manner.

In Fig. Q of the drawings, there is represented a reinforcing member 1l in the form of interwoven wire, such as the ordinary poultry wire. This reinforcing member is embedded in the composite board between the center plies 6 and 7 of the four-ply structure 5, 6, 7', 8.

It will, of course, be understood that the variousplies of material in the two modifications of the invention illustrated in Figs. l and 2 of the dran-'ings are suitably cemented together by an adhesive, such, for exaluple, as silicate of soda. The reinforcing member of reticular form is entirely embedded and inclosed within the composite structure and is in effect an intern'iediatc plv which is securely cemented to the adjacent plies of paper stock. A very rigid unitary structure is thus obtained, which in external appeaance does not differ from the heretofore ordinary commercial types of wall board. However, as the result of the reinil t) fencing niemben te'tienieie teiiin eenen in einbedied in my improved eti etnie, tine eennpeeite ei' eeniypeiind bean'd et the pieeent invention peeeeseee ygieetei ifigidity LLind is iiiettei adapted iter genei'fd use by the tinde then ztie nifty et the eiiniiei' ienne 0i eeinpeinte bezind new en the ineiitet.

it eieiiu i. its new zii'tieie @it innnlifeetinfeu t eenipeund nenni, inzide up ei? et piumiity et piiee et ibei' steen: cemented tegetiieify mid eeinented-tegetiiei plies ed? iibei' Steen: being)` niiei'ently wenken dien@ one miie et theii plaine than along; tiny etiiei' Miey und i iein 'fencing ineinbei eeeeeitited with Seid plier@ et ber steelt 'tot Strengthening; the boni'd along seid inhei'entiy wenig: :wie end thereby eqnziiizing the strength et the beni-d in :iii diieetiens.

2. .de zi new ditieie eiinennteetnieD i eeinpeund been-d inside np ed tinnen@ nietei'ied with the tibet@ eiitei'idinglongitudinally' in snbetetntieiiy one diieetien end having; et i'eintereing fineinben @if ietieniei. ifeiin ei? gieitei rigidity along ene miie of ite piene than eden@ any ethei: wie theieeii, tiie ieinitem-,ing nieniinei' being znitinged with its inei'e rigid eine Snbetentieiiy tieiiievei'ee te tiie gei'ieiei diieetien in which tile ziiteieinentiened iibei'e entend.

3., t new inttieie @if nninnifatettnfeu e eeniyiennd bee-nd innde np et ai piinziiity ef piiee of iibieue mattei-ini eeinented tegetiiei eind znri'zinged with the nibeie entending)` ygeneiadiyin eine diteetien9 end 2in intei'inedizite ieindenein@l ply nit ietienizn' term keying lgi'ee-tei i? D dity eden@ e pei-timidi miie ed its ple-ne than nien@m tiny other eiie tineieeit intermediate ieinieieinggpity beiinfgeii'nnyb'ed "with its nieie rigid etnie westen tiziliy tranny/'eine tot the geneini diiieetien in niiieh the iii'eieeeid iibeie entend in fie e new zntieie @it indiniiieettnie, e eeinynennd Teeeid mede np @if at piuiraiiity ei ypiiee @it peper Steek cemented tegetheiy seid ideenid beinyji1 iniieientiy nweziiten along ene eine @it ite )iene than nien@ nny ethei ewiziey end at i'einigei'eing; ineiniaei' einbedied "within seid beaiid end hem/ing g'i'eattei rigidity dining1 n patiti-@nim time et ite piene than iL-leaning tiny etiieiW natia-i9 Seid ieiinteieiii@n ineinbei' being; eiii-iiged with ite iezitiyeiy niete rigid wie tinnetfei'ee te the iniieientiy wenn une @it the beei'd.

in teetiineny wiieieeit it sittin iny eignetni'e.,

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