US253656A - Stephen m - Google Patents

Description

as ordinarily low.

chine with a UNITED' STATES PATENT OFFICE.

STEPHEN M. ALLEN,.0F DUXBURY, MASSACHUSETTS.

MANuFAb-runs or'A PAPER-PULP, are.

.,.SPEGIFICATIQN farming Part of Letters. Estant Non 253.95.13. .dated February 14, 1882...

Application tiled August 30, 1881. (No specimens To all whom it may concern.- l

' Be it known that I, STEPHEN M. ALLEN, of

Duxbury, in the county of Plymouth and State of Massachusetts, have invented a new and useful Improvement in the Manufacture of Paper-Pulp and Leather-Board from Bark and other Wood Fiber, which improvement is fully set forth in the following specication.

This invention has for its object, namely the production of paper-board or leather-boar although itis in part applicable to other purposes.

It relates to an improved process for making pulp from the brous parts of bark of trees, to the combination of bark pulp with other wood ber, and to an improved leatherboard from wood ber, and process of making the same.

In order to prepare bark pulp in accordance ...with .this invention, the .,b1lrkissepatatedfr0m the tree-trunks in sheets, usually rst steaming or soaking the wood cut into strips of suitable length to make it come oft more easily. The process described in Patent No. 229,307, granted to Jas. Davy, Jr., June 29, 1880, be employed to advantage. By .means of proper sharp cutters the bark can be removed alone, or with a layer of the new wood just be- This new wood I have found can be brilized more readily than the part near the heart, and yields a very strong tough ber. The sheets of bark, with or without the adhering layer of solid wood, are flattened between rollers and fed on a traveling apron or otherwise 'to a. revolving cutter or picker, which is properly gaged to remove the outer or refuse bark, which 'possesses no valuable ber, and leave the inner rind or bers cleaned and perfect. A machine like a common planing-maplain revolvingknife or with a toothed cutter, and provided with means such employed for regulating the @amount of material taken oft, will answer the purpose. The inner bark is then put through a picker which tears it into shreds, is treated with hot water or alkaline solution, and beatenl into pulp. It may also be pulped in other ways, although the way described is deemed most advantageous. If it is to be mixed with other ber or with rag pulp, these can be ground simultaneously with itin the machine forming the subject of my vapplication for patent tiled August 1,5, 1881, for improvement in the manumay facture of paper-pulp'from woodnnd other materials. Y

It may be here observed that the manufacture of paper-pulp from bark has been heretofore suggested. It has, for example. been proposed to grind the whole bark and to separate the fibrous from the non-brous portions by washing or sifting. N one,howeve.r, of the processes proposed contemplate the removal of the bark in' sheets, nor the separation of the .rough and useless bark in the manner indicated; nor do they cover the specific process of-making pulp ns stated above. Inusin g this pulp it is always preferred to mix it with other iber,'although it canbe made into paper or board byitselt. It can be subjected to bleaching processes, if desired.

In order top .make leather or paper board in ccordancm'xviththisinyentioninthe mostad vantageous .ground together in any suitable machine. The mixed pulp, which should contain about onethird bark and two-thirds solid-wood ber from new wood or old wood, or both, is placed in a beating-engine y wherein it can be heated. While hot it is thoroughly incorporated .with asphalt sizing. of pure asphalt melted or softened with any mineral, vegetable, or animal oil, or with other resinous material, in connection with reduced alkalies mixed in hot water. The sizing is used in the proportion ol' about ve to ten parts to ninety or ninety-ve parts of pulp. When the materials are well mixed the pulp is run oil onto a board-machine of any usual construction and matie into sheets of leather or paper board of the desired dimensions. The sizing not only colors and sizes the leather or paper board, but renders it nearly water-proof. Other coloring-matter or sizing can be introduced into the beating-engine, or they may be introduced into the grinder, if desired. The board can also be embossed or painted, if desired. It is excellently adapted to the manufacture of chair seats and backs, to trunk-coverings, as a substitute for patent-leather in saddles and harness, tocap visors and trimmings, to car-sheathing, machine-belting, rooting, washers for screw-nuts, &c. Paper-board may be made in the manner indicated with .various .proportions of solid-wood ber and bark ber,

of solid-wood ber alone, or of bark ber alone.

This sizing consists of a base -shreds in a picker,

More or less rag ber or ber from other paper-stock may alsobe mixed with the wood ber.

Instead of grinding tbe solid wood and bark together, they may be made into pulp separately by grinding or other process, and then mixed in the boating-engine, or the bark, after being torn to pieces in the picker, can be added to the disintegrated or ground Wood ber in said engine.

In the sopa-ration of the rough useless bark from the fibrous portions the latter may be planed oiu the form of shavings, leaving the rough portions. j

Having now fully described my said invention and the manner of carrying the sameinto eect, What I claim is y l'. The method of making pulp from bark by separating the rough from the fibrous portion, tearing the latter into shreds by a. picker, soak ing, and heating, substantially as described.

2. The method of makingbark pulp by removing the bark in sheets, separating the rough bark from the brous portions by planing, and then tearing the fibrous portions to soaking them, and beating them into pulp, substantiallyv as described.

3. The method of preparing bark pulpl or making paper, paperboard, and like articles, by mixing the bark pulp with or without pulp from solid wood or other material, while hot, with asphalt sizing or other sizing, substantially as described.

4. Paper-pulp, paper, paper or leather board, or other manufacture of paper containing bark pulp alone or with other ber sized with asphalt sizing, substantially as described.

5. The combination in paper-pulp, paper, paper or leather board, and the like, of bark pulp and solid wood pulp, substantially as d-` scribed.

6. A paper or leather board of bark pulp and solid-wood or other pulp, sized and colored with asphalt/ sizing, or other sizing and coloring materials, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' STEPHEN M. ALLEN.

Witnesses:

H. G. ALLEN, C. J. HEDRIGK.