US1300357A - Process of treating paper-pulp. - Google Patents

Description

J'UDSON A. DE GEW, Oi MONTREAL, QUEBEC, CANADA.

rnocnssor TREATING PAPER-PULP.

No Drawing.

To all whom it mag concern:

Be it known that L/JUDSON A. DE CEW,

a subject of the King of Great Britain, and

' from, and also for facilitating the sizing and coloring of the paper, and the general working conditions of the paper stock on the paper making machine. I

The paper stock may be treated either in the beating engine or prior to its employment therein, and my process consists essentially in the treatment of the paper making fibers with a solution of sodium aluminate prior to the sizing and "coloring of the paper stock. The result obtained is the y deposition of the alumina within the cellu- 'to the fiberslose or paper fibers by the absorption of sodiumaluminate, and also the deposition on the surface of the fibers of colloidal alumina by the principle of adsorption. It 's well known to those familiar with cellulose chemistry that cellulose will absorb approximately 2% of its weight of caustic alkali. If the cellulose is treated with aluminate of soda, the surface of the fibers will be impregnated with alumina, which will be removed from the soda by dialysis 'durin the impregnating process, and an ionization of the solution when diluted in the beating engine will adhere to the surface of the fibers by adsorption.- I

The treatment of the paper stock, therefore, with sodium aluminate results in aslightly alkaline reaction within the fibers,

the removal of any acidity that maybe present therein, and the impregnation oi the fiber surface by alumina in the colloidal state. Not only is a special character given y this treatment, but any soluble impurities-associated with the fibers willbe thrown out of solution by this treatment, or will be rendered insoluble. The result isthat the fibers andv the solution of water in which the fibers are suspended are both prepared'forthe subsequent chemical and physical reactions which take'place in the Specification of Letterslatent.

colloi al alumina separated by the Patented Apr. 15, 1919.

Application filed September 25, 1917. Serial No. 193,162.

sizing and dyeing process, and thus proper efiiciency and uniform results can be obtained in this further treatment. The amount of material used in the treatment will be approximately from &% to of the paper stock treated, the proportlons depending upon the character of the fiber and the amount of impurities associated with them.

In carrying out my invention, T'prefer to add approximately from two to. five pounds of sodium aluminate toone thousand.

pounds of paper stock in a beating engine prior to its'sizin treatment. The material is then thoroughfi mixed by the beater. It

'will be obvious, however,that the sodium -also gives the fibers a more water repellent character than that obtained solely from the precipitation of the rosin soap by means of alum.

- In the'dyeing process, the paper stock which has had this preliminary treatment will adsorb more of the dye than that which is untreated. Consequently, the cost of dyeing will be greatly reduced. In coloring with ultramarine, the retention of this material is increased and the subsequent destructive action of the alum solution is decreased, so that the coloring is obtained with less material than paper stock which has not been treated by this process. a

There are also mechanical advantages resulting from this treatment due to the fact that any stickiness of the fibers is greatly reduced by the coating of alumina deposited on them, and consequently it is possibleto make paper with less sticking on the wires and presses.

Having thus described my invention, what I claim 15:-

1. A-process which consists in treating paper making fibers with a solution of aluminate of soda and allowing the same to 'prior to thedyeing and sizing of the stock be taken up and reactwith the fibers, before said fibers are treated with rosin sizing solutions.

2. A process which consists in treatingv paper making fibers with a. solution of aluminate of soda and allowing the same to be taken up and react with the fibers,-

. then treating-with rosin size'solutions con- 'taiiiirig paper making fibers with a solution of aluminate of soda, and allowing the same to free rosin. process whlch consists 1n treating be taken up and react with the fibers, then neutralizing any free or excess alkali and 'then adding a solution of rosin soa containing free rosin which is eventua ly coagulated by means of sulfate of alumina.

5. A' process of mordanting paper making fibers so. that they will 'more readily absorb certain classes of dyes and also colloidal solutions of rosin in rosin soap which con- I my hand.

sists in treatin the paper making fibers with aweak so ution of sodium aluminate alone until the fibers themselveshave become slightly alkaline from the absorption of this aluminate of soda. 5-

6. A processof increasing the aflinity of cellulose fibrous material for solutions of rosin soap containing free rosin which conslsts -1I1 obtalnlng a chemlcal reaction 'be-- tween the cellulose and sodium aluminate before the soap is added .to the stock.

7 A processof sizing which comprises treating paper stock in a beating engine with sodium aluminate and separately with rosin soa solution containing free rosin acids in t e colloidal state.

8. A process of sizing paper stock, which comprises treating the same in a fluent condition. separately with a dilute solution containing a soluble aluminate and with a dilute solution of rosin size containing free rosin acid, the solutions being diluted to such an extent that the free alkali in the alum'lrosin acid in the soap solution.

In wltness whereof, I have hereunto set JUDsoN A. m CEW.

' nate solution will not 'sap onify the free