US2423097A - Beater for disintegrating paper containing resin - Google Patents

Description

July 1, 1947.

BEATER FOR msmrmxmme PAPER CONTAINING RESIN Filed Feb. 5, 1945 r 1 mvrons M. GOEHL'ER ET AL 2,423,097

conform to the curve of the beater roll and then rises to a peak or crest spaced from the roll and drops on its other side in a steep slope. The roll operates to throw the stufi or stock over the crest or peak of the back fall, thus forminga head with the result that the force of gravity causes the stock to travel away from the roll, around the tub on the other side of the midboard 6, and then back to the roll again. This circulation of the stock continues for a substantial time period, depending upon the type of stock and the treatment in the beater required by the stock.

The essence of the invention is the introduction of saturated or superheated steam at high pressure adjacent the rear or'upstream side of the roll 1 between the latter and the back fall l2, or immediately adjacent the back fall. By referring to the drawing, it will be noted that steam nozzles are indicated by the numerals I3 and M respectively. The two nozzles I3 are arranged at different levels in the space between, the upper surface of the back fall and the beater roll, as shown. in the drawing to discharge steam adjacent the inner end of the back fall l3 and are extended through the midboard 6, while the nozzles 14 are similarly located on the opposite side of the channel and are adapted to discharge steam adjacent the outer end of the back falland are extended through the side wall of the tub 5. The nozzles l3 and III are connected with main supply conduits l5 and I6 respectively which connect with a source of supply of steam which is saturated or superheated and at high pressure (not shown). The branches from the main supply conduits l5 and IE to the nozzles l3 and M are controlled by hand valves II. It will thus be seen that the steam discharge nozzles I3 and I l emit saturated or superheated steam at high pressure adjacent opposite ends of the back fall between the front face of the back fall and the rear peripheral portion of the roll I.

It may also be desirable to augment the steam supply nozzles l3 and M by a header I8 extended horizontally through an upper portion of the back fall and connected by a pipe 19 with one of the main supply conduits, as the conduit I5. Passage of steam from the main supply conduit l5 through the branch pipe 19 and into the header I8 may be controlled by a hand valve 20. Branching out radially from the header l8 and having their open ends adapted to discharge adjacent surface portions of the back fall are discharge nozzles 2|. The arrangement of the nozzles 2| imbedded in the back fall and opening therethrough is subject to considerable variation depending upon theconditions to be met, but said nozzles 2| discharge steam immediately adjacent surface portions of the crest of the back fall.

The purpose of all of the steam discharge nozzles 13, I4 and 2| is to discharge saturated or superheated steam at high pressure into the circulating stockand onto surface portions of the equipment. The steam thus emitted serves to burst and cook the stock, increase the circulation and turbulence of the stock, and to clear the back fall against filming and matting of the stock thereon whereby clogging of the apparatus and impairment of the stock circulation is prevented. The nozzles 2| imbedded in the back fall are particularly efiective in preventing the stock from' filming and matting on the back fall.

The saturated or superheated steam at high pressure emitted into the apparatus and the stock therein serves, in conjunction with the mechanical manipulation of the stock, to greatly facilitate the wetting and separation of the stock. As a result, the brushing action of the roll I is of less consequence than in conventional practice so that the roll I may be operated in a position relatively high oil! the bed plate II. This results in a treatment which saves rather than destroys the fibers of the stock.

The improved beater construction and the method of treating stock therein is highly advantageous over conventional practices utilizing standard heaters. Certain types of stocks are difl'icult to manipulate in a standard beater following standard treatment of the stock in the beater. In this category are waste papers including those which have been treated with melamine resin. Such mentioned stocks are available for use in paper making and are inexpensive, but

heretofore, their treatment in a beater required such an excessive time period as to render their use uneconomical and impractical. As an example, eight or more hours were required to separate, thoroughly prepare and condition such stocks in a conventional beater utilizing conventional treatments therein. As against this, such difficult stocks may be very effectively and thoroughly separated and prepared in the improved beater construction utilizing the treatment with saturated or superheated steam at high pressure, described, in a period of about 1 hours. The improved beater and method of treatment in connection therewith therefore permits the economical and practical use of the types of difficult stocks, previously mentioned, and which was not heretofore practical or economical. Additionally, the use of stocks of the type described permits the production of a superior paper because the improved beater construction and method of treatment therein insures better and more adequate separation of the stock, at the same time permitting the use of such diificult stocks which, however, have incorporated therein certain desirable ingredients and which basically have exceptionally strong fibers.

The invention is also applicable to sulphate and sulphite pulps and rags, cotton linters and flax pulp and permits the expeditious separation and hydration of the fibers of such stocks.

Additionally, the operation of a beater constructed in accordance with the present invention, insures continuous beater operation without danger of the circulation of the stock therein being deterred and without danger of portions of the equipment becoming clogged or having stock films matted thereon.

The saturated and/or superheated steam introduced into the beater is preferably at a pressure of substantially pounds per square inch.

The improved beater construction and method of treating stock therein is simple, economical andpractical, and is well adapted for the purposes set forth.

What is claimed as the invention is:

1. A beater comprising in combination a tub having a channel including a bottom and two side walls, a bed plate in said bottom, a rotatable beater roll above said bed plate, means for maintaining said beater roll in a position high off the bed plate, a back fall extending across the channel adjacent said beater roll having its upper surface spaced from the beater roll, and two steam discharge nozzles mounted in each of the two sidewalls in the space between the upper surface of the back fall and the beater roll, said two nozzles being located at different levelsin said space and disposed angularly with their open ends directed towards the upp r surface of the back fall, said nozzles being connected to a source of high pressure steam whereby the jets of steam which issue therefrom function to burst and cook the stock, clear the back fall, prevent the formation and matting of stock films thereon and to increase the stock circulation and turbulence within the beater tub.

2. A beater according to claim 1 in which a plurality of additional steam discharge nozzles, adapted to be connected to a source of high pressure steam, are located and imbedded in the upper surface of the back fall on the side adjac'ent the beater roll.

, FRANK H; REIMER. v .EUGENE F. DAVIS.

REFERENCES CITED The following references are of record in the file of this patent:

OTHER REFERENCES Page 34, paragraph 4, column 1, of Paper Trade Journal vol. 117, No. 19, Nov. 4, 1943.

BulletinNo. 9, of Heavy and Paper Chemical Dept; of the American Cyanamid and Chemical Corp., New York, N. Y., Sept. 17, 1943 page 3.

Images