USRE2384E - Improved apparatus for bleaching paper-pulp - Google Patents

Description

.UNITED STATES PATENT OEEIGE.

THE IIYDROSTATIC PAPER COMPANY, OF ROCHESTER, N. Y., ASSIGNEES,

BY MESNE ASSIGNMENTS, OF HENRY L. JONESANI) DUNCAN S. FAR- QUHARSON.

IMPROVED APPARATUS FOR BL EACHING PAPER-PULP.

Specification forming part of Letters Patent No. 53,152, dated March 13, 1886; Reissue No. 2,384, dated October 23, 1866.

To all whom it may concern.-

Be it known that HENRY L. JONES and DUNCAN S. FAEQUHARsoN, both of Rochester, in the county ot' Monroe and State of New York, 4have invented a new and Improved ,Process for BleachingMaterial for Paper-Pulp, and I do ,hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, which are inadc part of this specication, and in which- Figure 1 is an end elevation of an apparatus representing the invention. Fig. 2 is a vertical longitudinal section of the same.

Similar letters of reference indicate corresponding parts in the two igures.

The said invention consists, essentially, in bleaching straw, rags, woody ber, or other material susceptible of conversion into paper, by subjecting such material to pressure from the liquid which contains the bleaching` substance in solution.

The material to be bleached, after bein g reduced and prepared in the customary manner, is placed in a hollow cylinder orother suitable vessel, which receives the bleaching-liquid, which is forced into the said cylinder from a pump or otherwise, so that it shall exert considerable pressuie'upon the material within the cylinder; or the material may be placed in the cylinder or vessel, which may then be iilled or nearly lled with the bleaching liquid. The necessary pressure may then be secured by forcing into the cylinder or vessel any liquid, or even air itself, or it maybe secured by any mechanical appliance by which a sufficient pressure of the bleaching liquid upon the material can be obtained while the chemical action (usually denominate( bleaching) is taking place. The amount of pressure requi- ASite will vary in accordance with the material to be .bleached and the strength of the bleaching liquid, but it will be found that an increase of pressure will effect a corresponding saving in the strength of the bleaching liquid required.

In order that others skilled in the art to which the invention appertains may beenthrough which the cylinder A communicates with the vat or vessel C containing the liquid, which is forced from the vat through `Jthe pipe B and into the cylinder A by means of aforcepump, D, which may be operated by steam. In this way the bleaching liquidis forced into the cylinder A under great pressure, so that the material to be bleached-is thoroughly irn- 'pregnated or mingled with the bleachingliquid, and the action of the latter is rendered much more efficient and quick than it is under the ordinary process.

If preferred the liquid may be supplied to the cylinder from an elevated reservoir or vat, E, which is supported at a suitable height to insure the necessary pressure, and made to communicate with the cylinder Athrough the pipe F.

The material to be bleached is introduced into the cylinder A through a man-hole at A', and through the latter the contents of the cylinder are discharged after the bleaching has been completed, the whole being deposited into a vat, G, with a false bottom. The pulp remains in the vat G, while the liquid runs through its perforated bottom and returns to the vat C through the pipe H.

An apparatus consisting of the above-described parts, or their equivalents, is all that is necessary in carrying out our invention; but we will now proceed to describe devices which t perform certain functions which render the operation of the apparatus more perfect.

The cylinder A is mounted upon standards I I', and is supported by journals a a', the latter a of which is made hollow to receive the the end of a short shaft,l which is suitably supported at the top of the standard I', and also carries a spur-gear, L, which receives rotary motion from a pinion upon the same shaft as the pulley N, to `which power may be applied from an engine to operate the pump. Hence, as the pulley N is rotated during,` the operation of the pump, the abovedescribed gearing communicates motion to the cylinder A, whose rotation produces an agitation of its contents, and thus exposes all the parts of the pulp to the liquid as soon as the operation of the apparatus is initiated.

A safety-valve at O, held down by an adjustable Weight, is raised When the hydrostatic pressure becolnes of an over-excessive character, and when the safety-valve O is thus raised a secondary valve is opened, which allows the liquid `to return to the vat C through a pipe,P.

The pipe leading,` from the elevated vat is opened and closed at. will by means of the cock Q. t

It is needless to specify all the dit'erent lmeans by which this invention can be advantageously carried out; but We state specifically that we do not intend tov limit ourselves to any particular apparatus, but propose to avail ourselves of such modifications yas mayl'be'found desirable.

Having thus described the invention, the

following` is what we claim and desire to secure by Letters Patent:

A 1. Bleaching the material to be converted into paper by subjecting the same to the action of bleaching liquor applied under pressure, substantially as described.

2. The combination, with the cylinder A, of the pump D and pipe B, substantially as and for the purpose set forth.

3. The combination, With the cylinder A, ot the elevated reservoir E and pipe F, substantially as and for the purposes set forth.

4. In combination with the cyliuderA, pump D, and pipe P, the valve O, for relieving the pressure ot theliquid, as explained.

y THE HYDROSTATIG PAPER GO.,

By J. O. WTOODRUFF,

Its President.

In presence of- DE L. CRITTENDEN, EDWARD S. YOUNG.

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