US1121951A - Wall-board. - Google Patents

Description

. J. H. THIUKENS.

WALL BOARD. APPLICATION FILED SEPT. 17, 1914.

Patented Dec. 22, 1914.

s. n nk mb nv M M a .v uw. NUSN I d gQ/TNESSES ATTORNEYS UNITED sTATEs rATENToFFIcE.

JOHN H. THICKENS, OF'BUFFALO, NEW YORK, ASSIGNOR TO THE BEAVER COMPANY, F BUFFALO, NEW YORK, A CORPORATION 0F OHIO.

'WALL-BOARD.

Specification of Letters Patent. Patented Dec 22,1914.

Application led September 17, 1914. Serial No. 862,235.

have invented certain new and useful Im,

provements in W all-Board; and I 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 composite wood pulp sheets suitable for use in buildings in place of lath and plaster.

It is an object of thepresent invention to produce a. wall board having high rigidity, high tensile strength, low moisture absorption, high resistance to puncture and having good heat-insulating and sound-deadening properties. y

lt is a further object of the invention to produce a composite Wood pulp sheet which is to some extent fire resistant, and which can be used behind radiators, and around registers, and the like without danger of disintegration from the heat.

It is a furtherobject of the present in vention to produce a wall board, smooth and attractive on the surface, and well suited for ornamentation and so constituted as to be relatively free from warping, buckling and excessive shrinkage, to the end that the sheets of material may be nailed or tacked to the studding of a room and there decorated by painting or tinting to serve in place of lath and plaster. f

ln accomplishing the foregoing objects and others which will hereinafter appear, I form the composite sheet or wall board with a core of ground wood pulp to which is secured a facing of cooked wood pulp. The core may be multi-ply if desired, and

the facing may be on both sides of the coreand held in place with a silicate cement. Preferably, the cooked wood facings are ycovered with a thin layer of ground wood,

light in color, to facilitate ornamentation.

For a better understanding of the present invention, reference is made to the accompanying drawing, wherein- Figure 1 is a section, somewhat diagram-A matic in character, through a composite sheet made in accordance with -this invention, and Fig. 2 illustrates a modification in which the ground wood core is multi-ply.

In the vembodiment illustrated, the com-4 H. THICKENS,

erties.' The core is not, however, highly resistant to moisture nor is itrelatively strong eitherlin tension or to resist puncture. According to the present invention,

this sheet of porous, ground wood pulp is covered with tougher material, preferably in the form of a facing on both sides, consisting of sheets 2 and 3 of cooked wood pulp cemented in place at 4 and 5 with a sodium silicate cement. cooked wood pulp.may be made from the same kind'of wood as the central core, but insteady of grinding the wood, it is cut into two foot lengths and placed in aA steam digester and there cooked in steam for six to eight hours at sixty to eighty pounds pressure, and then mechanically reduced to the form of pulp inusual manner. Cooked These sheets of wood pulp has a long fiber, and sheets made ,mented with pitch or other similar compound.

It is not necessary that the cooked wood be of the same variety as the ground wood for the fact that the wood is cooked before grinding makes possible the production of a strong tough fiber from a large number of woods. Consequently, in this way, it is possible to utilize for wall board purposes many varieties which are not now in use.

In cooking wood to produce the long iibered pulp, the Wood turns brown, Whereas ordinary ground lwood is white, and in order that users of this composite board may decorate the board with light tints, it' has beenv found desirable to cover the cooked wood layers with thin surface facings 6 and 7 of ground wood. These facings may be very thin and they give to the composlte sheet a smooth and satisfactory surface without impairing substantially its resistance to moisture, puncture and the like. Preferably they are put on the brown ply during the process of manufacture on the board machine and without the use of cement for the bers of the facings, when thus applied, interlock with the brown bers adjacent, to make a good board.

ln the modicati central core is multi-ply and includes a plurality of ground wood sheets 8 and 9 covered on the outside with layers of tough -cooked wood 10 and 11 all fastened together with sodium silicate cement. The dark cooked wood coverings are .faced -with ground wood layers 12 and 13 as before.

The composite sheetsf above described arel the outer sheets of cooked wood with long,

tough bers closely acked together. The density of the cookedPwood coverings keeps down the moisture absorption and so prevents abnormal buckling, warping and detrimental deformation and thesodium silicate cement holds the several layers against dan er of separation even under trying heat con itions. v

In commercial manufacture, it is expedient to arrange the core and its covering sheets with the ber or grain running cross-wise or at an angle, as disclosed in United States Letters Patent No'. 1,063,941, issued June 3, 1913, to J. P. Lewis. This arrangement of thev ber structure may likewise be applied to the several plys of the multi-ply core. By thus crossingv the grain, the mechanical properties are to some-extent improved.

l am aware that the proportions and aron shown in Fig. E, thel mamen rous lground wood pulp faced on both'sides with tough cooked wood-pulp -cemented in place.

3. A composite wood pulp sheet comprising a coro of porous ground wood pulp faced with a sheet of tough cooked wood pulp held in place with a sodium silicate cement.

4. A composite wood pulp sheet comprising a multi-ply core of porous ground wood pulp, said core being covered on each side with a sheet of tough cooked wood pulp held in place with a silicate cement.'

5. A composite wood pulp sheet, consisting of a central core of porous' ground wood, said core being covered on each side with a sheet of tough cooked wood, and a thin surface facing for said cooked wood sheets consisting of groundwood, light in color, to facilitate ornamentation.

6. A composite wood pulp sheet, consisting of a'multi-ply core of porous ground wood sheets cemented together, sheets of tough cooked wood covering said corey and secured thereto with a silicate cement, and thin surface covering for said cooked wood sheets, consisting of ground wood of light color.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN H. THICKENS.

`*Witnessesr l RALPH C. LOWARY, MARGARET LroNs.

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