US2236005A - Apparatus for coating both sides of a web of paper - Google Patents

Description

March 25, 1941.

P. J. MASSEY APPARATUS FOR COATING BOTH SIDES OF A WEB OF PAPER Filed Sept. 15, 1939 2 Sheets-Sheet l wzzmmwmmllmmiiilaillma INVENTOR.

March 25, 1941 P. J. MASSEY APPARATUS FOR COATING BOTH SIDES OF A WEB OF PAPER Filed Sept. 15, 1959 2 Sheets-Sheet 2 INVENTOR. P4756. .Z fleas/5% $4 U.

M Mi

ATTORNEY.

Patented Mar. 25, 1941 UNITED STATES PATENT OFFICE APPARATUS FOR CDATING BOTH SIDES F AWEBOFPAPE lOlaim.

This invention relates to an apparatus especially designed and adapted for producing a sheet of paper to improve its formation and its surface, and to enhance its printing properties.

The apparatus of the present invention is especially designed and adapted to carry out with maximum efliciency and advantage the method described and claimed in my application for Method of coating paper," filed November 14, 1938, Serial No. 240,211, issued as Patent No. 2,185,859 in instances where it is desired to coat both sides of the paper.

The broad and general objects of the present invention are sounded in the application above referred to, and in my application for Apparatus for coating paper," filed September 9, 1939, Serial No. 294,041.

The principal object of the present invention is to provide a simple, practical, emcient, and easily controllable apparatus for coating both sides of the web of paper during the process of its formation in the paper-making machine.

A further object of the invention is to provide an apparatus of this character, which, while fully capable of coating both sides of the sheet of paper, and of handling various types of sheets, is very readily converted into an apparatus which will coat only the one side of the web or sheet should this be desired.

Other objects and advantages reside in certain novel features of the construction, arrangement, and combination of parts, which will be hereinafter more fully described and particularly pointed out in the appended claim, reference being had to the accompanying drawings forming a part of this specification, and in which:

Figure 1 is a fragmentary view in side elevation showing an apparatus embodying the present invention incorporated in a Fourdrinier type of paper-making machine and illustrating the apparatus operatively positioned to coat both sides of the web of paper.

Figure 2 is a fragmentary view similar to Figure 1 but showing one of the film-forming transfer rolls shifted to an idle or inoperative position.

Figure 3 is a fragmentary view in elevation, the machine being viewed from line 3-3 of Figure 1.

Referring to the drawings, and more particularly to Figures 1 to 3, inclusive, the numeral I 0 designates generally the frame of a Fourdrinier paper-making machine, that portion of the machine being shown which includes the driers ll Theframe of the machine includes standards i 3 at each side, and these are employed to support the bearings II for a film-forming transfer roll [5. In rolling pressure contact with the filmforming roll I! is a rubber covered roll I6 supported for rotation in bearings I! provided upon swingable supports Hi. There is one such hearing and support at each end of the roll it, although only one is shown since the other side of the machine is of identical construction. Each support I8 is rockably mounted, as as I9, on a bearing bracket 20. The bearing brackets are mounted on and suitably fastened to the standards i3. In order to establish the necessary contact pressure between the rolls l5 and It, the outer end of each swingable support is has a screw 2| pivotally connected thereto. Hand-operated nut means 22 coacts with the screw 2| and 1 a fixed frame member of the machine to draw the supports it, and consequently the roller i6, toward the roller l5 and into suitable pressure contact therewith.

I Cooperable with the rubber-covered roll it is a second film-forming transfer roll 25, which has end trunnions 26 rotatably supported in bearings 21 carried by swingable supports 28. The supports 28 are pivotally mounted, as at 29, on hearing brackets 30, fastened to the upper ends of uprights 3i, suitably secured to the floor foundation, and appropriately cross connected and braced. Each support 28 is provided with a lever and 32 extending upwardly therefrom at an angle. A rod 33 is pivotally connected to each lever 32, and has a threaded portion 34'. extending loosely through an opening provided therefor in an abutment plate 35 fastened to the adjacent upright 3|. A wing nut 35 is engaged with a threaded portion 34 extending loosely through an abutment plate 35 fastened to the adjacent upright 3|. The wing nut 38 is engaged with a threaded portion of each rod 33 which projects beyond the abutment plate 35, and coacts with the abutment plate to control the position of its cooperable support 32.

This construction makes it practical to have the film-forming transfer roll 25 in rolling pressure contact with the rubber-covered roll I6 under the influence of its own weight, as is illustrated in Figure 1. However, if it-is desired to coat only one side of the web of paper, the wing nuts 36 may be turned to shift the supports 21, and consequently the roll 25, to the position shown in Figure 2, in which position the roll 25 is pulled upwardly and away from the roll it and consequently out of contact therewith.

The film-forming transfer rolls l5 and 25 are of identical construction. Each has its cylindrical or peripheral surface of intaglio formation, in

that the surface has a multiplicity of closely adjacent, minute depressions or pits, the low points or valleys of which are in open communication, whereas the high points or peaks of which are isolated. While this surface may be produced in various ways, as fully described in the applications above referred to, it has been found that a very satisfactory structure may be produced if rolls of bronze or gun metal are sandblasted in a precise and controlled manner and then chromium plated. For example, blasting a phos-' phorous bronze roll with a No. 50 steel grit at eight pounds pressure will produce on the surface of the roll an intaglio design of proper mesh or character, and of uniform depth of pit of the order of .003 of an inch.

A roll so constituted provides a surface which a liquid suspension of a pigment and an adhesive will wet, and a surface on which a definite film of uniform average or mean thickness will be formed. The surface has the capacity to form a continuous film of predetermined uniform average thickness by virtue of the mutual action of the molecular forces of the surface and of the suspension. The film is of a predetermined average thickness, for the reason that the surface is dimensionally pitted, and, therefore, functions as a means for volumetrically measuring as well as forming the film.

Each film-forming transfer roll has combined therewith suitable means for supplying the liquid suspension of a pigment and an adhesive thereto, and in each instance this means may take the form of an elongated pan or trough, designated at 40. A constant level of the liquid suspension is maintained in this pan or trough and a controlled excess of the liquid suspension is continuously delivered from the pan or trough to the associated film-forming transfer roll by an applicator roll ii.

The details of this means for supplying the controlled excess of liquid suspension to each film-forming transfer roll is fully described and claimed in my application for "Apparatus for coating paper," filed September 9, 1939, Serial No. 294,041, and reference is made to such application for a complete disclosure of these elements of the apparatus.

The excess of liquid suspension is removed from the roll prior to the formation of the film by means of an oscillating doctor 45, which is cooperatively related with each film-forming transfer roll. Here again the details of the doctor, and the means for operating it, are fully disclosed and claimed in my "Apparatus for coating paper application, filed September 9, 1939, Serial No. 294,041, and reference is again made to said application for a complete disclosure of these details of the structure.

In the apparatus heretofore described, the web of paper, designated at W, passes through the nip of the rolls II and I6, and during its passage the film of the liquid suspension that has been formed on the roll I! is directly transferred to the wire side of the sheet and simultaneously smoothed and compacted and enmeshed with the fibers thereof, and made an integral part of the sheet or web. At the same time, the other side of the sheet is similarly coated or surfaced, inasmuch as the film of the liquid suspension of pigment and adhesive formed on the film-forming transfer roll 25 is transferred to the rubber-covcred roll I I, and thence to the upper surface of the sheet or web. In this form of the invention the film-forming transfer roll directly contacts the wire side of the paper web, and this is desirable where a heavy coating is to be applied to the wire side. In many instances it is desirable to apply a somewhat lighter coating to the top side, and this is facilitated by utilizing the intermediate transfer roll Ii in the form of the invention shown in Figures 1 to 3.

While I have shown and described sever-a1 constructions in which the invention may be advantageously embodied, it is to be understood that the constructions shown have been selected merely for the purpose of illustration or example, and that various changes in the size, shape, and arrangement of the parts may be made without departing from the spirit of the invention or the scope of the subjoined claim.

I claim:

An apparatus of the character described for simultaneously coating the top and wire sides of a. web of paper with a liquid suspension of a pigment and adhesive and comprising an lntaglio surface film-forming noll positioned to directly contact the wire side of the web of paper, a rub her-covered roll in rolling con-tact pressure with said film-forming roll and adapted to apply rolling pressure to the web as it passes through the nip of said rolls, means for adjusting the rolling contact pressure between said rolls, a second intaglio surface film-forming roll adjustably cooperable with said rubber covered roll, means for supplying the liquid suspension to the intaglio surface of said film-forming rolls, and means for simultaneously rotating said film-forming rolls.

PETER JAY MASSEY.

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