US1482012A - Process for making paper - Google Patents

Description

Jan. 29 1924.

r w. R. HOWARD PROCESS FOR MAKING PAPER Filed Nov. 10 1920 .30 a felt bla Patented 10.11.29, 1924.

UNITED STATES PATENT OFFICE.

w B. HOWARD, OF BALLSTON, NEW YORK. ASSIGNOR TO FRANK L. BELKNAP,

OF CHICAGO, ILLINOIS.

PROCESS FOR MAKING PAPER.

Application filed November 10, 1920. Serial No. 423,015.

To all'wkom it may concern:

Be it known that I, Wnmrm R. HOWARD, a citizen of the United States, residing in the town of Ballston, county of Saratoga, and I State of New York, have invented certain new and useful Improvements in Processes for Making Paper, of which the following is a s ecification. I 4

his invention relates to improvements in 1 .0 a process and apparatus for making paper containing waterproofing substances, such as aspha t, tar or other bituminous materials.

The salient object of this invention is to 1B treat the felt blanket of a paper machine, where felt blankets are used, with a solution of some insulating substance, such as clay or soap in an aqueous vehicle, or any other substance which forms an insulating coating upon the surface of the blanket and prevents the tar, asphalt or other bituminous comosition used in waterproofing the 1 paper om adhering thereto. Figure 1 is a side elevation of the apparatus as appliedto what is commonly known as the first press of a paper machine.

Fig. 2 is a detail view of the immersion tank with parts broken away.

Referrin to the drawings-1 designates first commonly used on a paper machine for carrying the web, and 2 and 3 are up er and lower ressure rolls respectively is rough which'tlie blanket 1 is driven n a direction as shown by the arrows. After as passing through these press rollers, the blanket, subsequent to travelling over a series of stretching rolls, runs over the guide roller 4. After passing over this guide roller, the blanket is directed into a box or to tank 5 so placed as to extend the entire width of the felt blanket. Within this tank is mounted an immersion roller 6, over which the blanket passes in its travel. The roller 6 is positioned in the tank so that it is at all times partly immersed in the insulating substanoe or fluid which consists of clay, soap or other non-adhesive substances in an aqueous vehicle. From the immersion tank, the

blanket passes through rollers 7 and 8, which may! be regulated to impose any desired pressure upon the blanket in order that any desired amount of the insulatin' liquid may be retained in the blanket. ese pressure rollers or squeeze rollers are mounted over the projection of the box or tank 5 so that any liquid pressed from the blanket as it passes between the rollers, will flow back into the tank. The liquid insulating solution is introduced into the tank 5 through an inlet pipe 9 and the de th maintained 1n the tank is controlled by t e overflow pipe 10. It is necessary only to maintain the height of the liquid in the tank so high that the blanket, in its travel therethrough, will be entirely immersed in the insulating substance.

The operation of the process is as follows: The box or tank, being filled to the height of the overflow pipe with a solution of any suitable mineral soap and water or a mixture of clay in colloidal form in an aqueous vehicle, and the blanket travelling upon the rolls of the paper machine is directed about the immerslon roll at which time it is thoroughly saturated with this non-adhesive solution. After being thoroughly saturated, a portion of the liquid is removed from the blanket by means of the pressure rolls previously explained and only that amount of the solution retained in the blanket as will be essential to its counteracting the admission of the sticky bituminous waterproofing compositions to which it is subjected in the pa er making.

fter being thus treated, the blanket is in condition to receive the web of the waterroofing paper stock and, due. to this insuating substance, will carry and deliver the web without the difficulty of having the small particles of asphalt adhere to the blanket.

I claim as my invention: 1. A process of treating the felt blanket of a paper machine consisting in passing the blanket through a mixture of clay and water whereby the surface of the blanket is insulated against adhesive substance.

2. A process for insulating the felt blanket of a {paper machine against adhesive waterroo ng substances consisting in passin'g said lanket through an aqueous solution concontaining an insulating substance and dip recting the blanket subsequent to its immersion in the insulating substance through pressure rolls whereby the amount of insulating substance retained in the blanket may be regulated.

4. A process for insulating the felt blanket of a paper machine against adhesive waterroofing substances consisting in passing said blanket through an aqueous solution containing an insulating substance having a colloidal constituent.

WILLIAM R. HOWARD.

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