US25418A - Improvement in boilers for making paper-pulp from wood - Google Patents

Description

ATENE FFICE@ MORRIS L. KEN, OF ROYERS FORD, PENNSYLVANIA.

IMPROVEMENT IN BOILERS FOR MAKING PAPER-PULP FROM WOOD.

Specification forming part of Letters Patent No. 25,4 B S, dated September 13, 1859.

- To LZZ whom, it may concern,.-

Beit known that I, MoRRrs L. KEEN,of Royers Ford, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Boilers for Boiling Wood orLigneous Materials for Making Paper-Pulp Under Pressure; and I do hereby declare that the following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to the accompanying drawings, in which- Figure l represents a perspective view of said boiler. Fig. 2 represents a vertical central section through the same.

My invention relates to the construction of a boiler for boiling wood and ligneous materials for making'paper-pulp, in which proper provision is made for keeping` the stock covered by the alkali or liquid used and giving it motion to insure the mass being properly boiled throughout, and a discharge valve or cock, by means of which the stock, when sut'- ficiently boiled, is blown out in a pulpy state.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A represents a vertical cylindrical boiler, which is mounted on supports B, or on any other suitable frame. The upper part of the boiler is made conical,and is provided with an expansion-chamber, O, through the aperture of which the boiler is charged, and which is closed by a cover, D, which is bolted steamtight to the same. The bottom of the boiler A is made funnel-shaped and ends in the center in the discharge-pipe E. which is closed by a piston or stop-cock, G. The latter is secured to the rod H,and can be opened or closed by means of the hand-wheel F of the rod H, which passes through the stufng-box I and has its lower bearing in the bracket c. K represents two stirrers, the shafts of which run at theirlower ends inthe steps b, while their upper ends pass th rough the stuffing-boxes L,and are provided with pinions M,which are driven by suitable gearing. The shafts ofthe stirrers K are provided on one side only with the horizontal stirring-arms, which, when the boiler is to be charged, are turned toward the periphery of the boiler, and are therefore notin the way of the material as it is thrown into the boiler.

d represents a perforated plate, which is secured to the rod N, and which rests on the brackets g of the expansion-chamber C. Itis intended to press the material down and to keep it submerged in the fluid in which it is to be boiled. The plate d is prevent-ed from rising by the upper end of the rod N being in contact with the lower face of the cover D.

O represents try cocks, by which the material in the boiler can be tried, to what degree of perfection the stock is Worked.

The operation is as follows: The boiler being charged with the proper solution of caustic alkali or other suitable duid, and with the material which is to be reduced to pulp, the plate d is placed upon it and the cover D is screwed down tightly. The boiler A is then heated, either by a direct tire or by any other heating apparatus, and the mass in the boiler is boiled and stirred until thoroughly disintegrated. During this process thetsteam arising from the duid rises through the perforated plate d and fills the expansion chamber C, whence it exerts a pressure upon the boiling mass in the boiler. \Vhen the stock has been reduced to the desired perfection, the stopcock G is opened by means of the hand-wheel F, and the entire mass is blown, .by the pressure of the steam in the expansionchamber and boiler, through the pipe E, as a pulp,into an open tank adjacent to the boiler A. rIhe expansion chamber C may be provided with a pipe leading to a steam-gage to indicate the pressure ot' steam in the boiler.

Having thus described my invention, what I claim is A boiler for boiling under pressure wood and ligneous materials for making paper-pulp, constructed with an expansion-chamber, stirrers, and discharge valve or cock, arranged for the purposes and in the manner substantially as herein stated..

vMORRIS L. KEEN. Vi tn esses:

EPHRAIM MILLER, HUGH BURGEss.

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