US1970227A - Paper making - Google Patents

Description

Aug; 14, 1934. D FR|SB|E 1,970,227

PAPER MAKING Filed March 29, 1934 INVENTOR.

L E/ m D. F /ss/a ATTORNEY.

Patented Aug. 14, 1934 UNITED STATES. PATENT oFF cE PAPER MAKING Leroy D. Frisbie, Russell, Mass., assignor to Westfield River Paper Company, Inc., Russell, Mass., a corporation of Massachusetts Application March 29, 1934, Serial No. 718,031

4; Claims. (CI. 92-46) My invention relates to paper making and particularly to apparatus for and the 'method of producing glassine paper of uniform transparency.

As is well known, glassine paper made in accordance with methods generally'in use prior to my invention lacks uniform transparency, that is, such paper has a-mottled appearance, there being substantial areas of transparency interrupted by translucent streaks and spots.

This mottled appearance or non-uniform transparency, is due to the manner of moistening the paper before it is wound on cores or reels which are moved to the super-calenders for drawing, in which the single figure is a side elevation partly in section of apparatus for accomplishing the above stated purposes of the invention.

Referring to the drawing, the numeral 1 designates one of a pair of supports on which is journaled the shaft 2 of the core or reel 3 on which has been wound a roll 4 of glassine paper in opaque condition. This roll of paper is ready to be transferred to another core to be carried to the super-calenders. Thepaper is shown in the drawing passing under atension roll 5 androller 10 will be sprayed by the bristles of the brush on to the underside of the paper as it passes from the unwinding reel 3 to the winding reel 11 which is rotated by any suitable means.

- on the sheet, some of the globules impinge on The paper also passes aroundguide rolls 12 and.

surface where there are fibres softer than those in -other areas. Consequently thesoft fibres immediately become saturated, that is, absorb more water than is absorbed by other fibres in the sheet. This is due to'the fact that during the beating andjordaning processes in the hydration of the stock, it is not possible to treat every fibre the same, and this results in some of the fibres becoming quite hard while-others are much softer. I have found that by providing a smoothing roll of the character about to be described between the spray and the winding roller 11, the globules or particles of water sprayed on the sheet may be spread evenly on the entire sheet without some areas becoming more saturated than others. In 7 other words, instead of having the individual globules absorbed, I transform the globules into an even film which is the same across the entire sheet so that the sheet is evenly saturated. This results in obtaining a harder roll on winding reel 11 to go to the calender and avoiding wrinkling of the paper or roping during the calendering. In the drawing aroller 15 is keyed to ashaft 16 which may be driven by a belt 17 passing over a pulley connected to the shaft, or. by any other suitable means. The rotation ofroll 15 should be rapid and in a direction opposite to the direction of travel of the paper passing from the unwinding reel 3 to the winding reel 11. Theroller 15 is provided with a soft covering 18, preferably wool, although equivalent materials of a soft and absorbent nature ,may be used. Such material, I have found, will not make marks on the paper, and very effectively spreads the globules or particles of water converting them into an 'even film, .thus preventing excess moisture in some places andinsuflicient moisture in others, which has occurred under the processes and. apparatus used prior to my invention. of course the covering 18 becomes moist, but inasmuch as it is rapidly rotating, the moisture does not become excessive. If theroller 15 had a smooth metal or rubber surface to contact the particles of water on the paper, the particles would be picked up by the roller, at points on its surface and gradually collecting thereon .would form rings of water which would be thrown up on the sheet passing to reel 11. This would cause streaking, due to the excess water and the uneven distribution thereof as previously explained. -I-Iowever, 106 I have found in actual practice, that the roll constructed in accordance with the foregoing disclosure, that is, having a smooth soft absorbent covering contacting the sheet of paper after it is sprayed, and'rotating. thereagainst oppositely to 110 sprayed portions of the web with a rotating roll having a soft, absorbent surface contacting the web to uniformly smooth out the particles of water into a film on the web.

2. The method of increasing the uniformity of transparency of glassine paper which comprises moving the paper across a spray of water preparatory to calendering the paper whereby one side of the paper is moistened with particles of water, and while so moving and spraying the paper wiping the said side of the paper on which the particles of water have been sprayed with a rapidly rotating absorbent roll.

3. In the manufacture of transparent paper, the step of increasing the uniformity of transparency which comprises spraying water on one side of a continuously moving web of paper and wiping the web and the particles of sprayed water with an absorbent element to smooth out the particles and uniformly distribute moisture over said web.

4. Apparatus for treating paper to increase the uniformity of its transparency comprising, means to project a spray of water on the paper, means to move the paper across said spray, a roller adjacent the point where the spray contacts the paper, said roller having a soft absorbent surface against which the paper moves, and means to rotate said roller in a direction opposite to the direction of travel of the paper.

LEROY D. FRISBIE.

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