US1125232A - Process of finishing the surface of coated calendered printing-paper. - Google Patents

Description

J. S. WEYL.

PROCESS OF FINISHING THE SURFACE OF COATED OALBNDERED PRINTING PAPER.

APPLICATION FILED DEC. 31. 1913.

Patented Jan.'19, 1915.

ATTORNEY.

Un'iirnn snares earn-an anion.

JULIUS S. WEYL, F ELKINS a I PROCESS OF FINISHING THE SURFACE OF COATED Trip? rannsrrveme.

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Specification of Letters Eatent.

Yatented Jan. 19, W

Application filed December 31. mid. Serial Hp.-80&,fi27-. I

To all whom it may concern:

die it known that 1, Jones S. WEYL,'a citizen of the United States, residing at Elkins Park, Montgomery county, State. of

Pennsylvania, have invented certain new and a useful Improvements in Processes of'Finishin-g the Surface of Coated ..ande.-Calendered Printing-Paper of which the'followmg is a full, clear, and exact-description, reference being had to the accompanying drawings, forming a pa-rtof this specification.

My invention relates to the preparation of the surface of printing paper to better adapt it, in smoothness, evenness of surface and absence of shine or gloss, to relief print ing of fine plate engravings including especially such as printed from photo-mechanical half tone plates.

In the preparation of the surface of printing paper for relief printing such as the production of fine half tone engravings, a

so-called coated paper must be employed.

' that it reflects light, which not only obstructs a full and proper view of the engraved picture, but is injurious to the eyes of the reader. To avoid this objectionable glossy effect of coated and calendered printing papers it has been attempted to dull it. either by admixing a certain proportion of ground barium sulfate crystals Withthe clay; in the coating mixture, or by minimizing the usual calendering effect by adjustment of the pressure of the rolls; but neither method satisfactorily accomplishes the result sought, because while producing a surface free from excessive glare an uneven surface is frequently the result, making. uni form plate printing impossible.

To overcome the objections stated and to produce a coated printing paper havlnga line smooth and even surface and free from gloss, I have discovered a method which is simple and yet effective and which consists es entially in subjecting the paper in the.

coated condition e-fi terdrying, and with or without calendaring and while properl supported and in million, to the action of a suitably applied a v la me t after the met o of mechani ally etching r t glass. a .n the accompany. drawings I have illustrated mechanical means suitable for PP -y g he eed b ast to the paper to be treated.

ln-sand drawings Figure 1 is. a plan view with the closing coverand paper-supporting.

plateremoved, and ig- 2 a sideevation of the; complete-demote partly in section.

Referringto said drawings, 1 indicates a suitable inclosing frame, the rectangular 0 en top of which. supports a like shaped at frame 9", and upon the, latter is rested a like shaped coyeri-ngframe 12 which is closed except at its center 12, and between said cover i2 and frame 9 is mounted a paper-supporting board 11 which is of the full width of the roll of paper to be treated and somewhat lessthan the width of the said parts 1, 9* and 12 Mounted Within the inclosing frame 1 and extending through to its opposite sidewalls is a horizontallydisposed tube 3. which serves as a conduit for compressed air derived from. any adja cent source of supply.

The tubeB, for a distance within the in closing frame is; provided with .an elongated narrow discharge nozzle 3, the apex or top of which projectsupward and into a pres sure and sand chamber 4 which may be in the form of" a square plate with a central depression and edge' flanges 5,'and upon the latter rests a flat cover plate 6, having a central elongated aperture disposed immediately over the mouth of the nozzle 3, and in saidaperture in the plate 6 is mounted a vertically disposed sand-discharge nozzle 8, which a Seen intop view Fig. 1, has a discharge endinthe form of an elongatedslit, slightly less in length than the width of the roll ef'paper to be treated. In the plate 5 are two series of perforations 6 6 operating as sand holes, and arranged in parallelism with each other and with "the sand discharge nozzle 8- and on each side thereof.

Resting with its base on the plate 5 is a hopper 7, of suitable shape to accord with the frame; Thetop edges of the inclined walls of thehopper rest on the inner edges i and compressed air pressure, at the-dis-' of the element 9 and within the inclosing frame 1. Within the hopper 7 is a sand screen 9 through which the extreme top of the elongated sand nozzle 8 projects. Within each of the elements 9 9 are loosely mounted a pair of freely rotatable guide rollers 10, 10 and on the inlet side of the supporting frame 1 and Within the same is mounted a freely rotatable paper supporting and guiding roller 10.

On the middle side of the apparatus is located a stand 13 adapted to support a length of paper to be treated, rolled up on a rotatable holder 14; and on the opposite side of'the apparatus is a like stand 13 supporting a take-up roller 15 driven by a pulleylti, which may be actuated by suitable means such as an electric motor, indicated at 1% In operating the device to carry out myprocess, T have obtained successful results by employing a fine quality of sand commonly used for etching work,

charge nozzle, of one and three quarters to iive pounds, with the discharge end of the nozzle 8 at a distance of'five or six inches from. the surface of-the paper and discharging at right angles thereto; though doubtless all these proportionsmay be varied ployed; while the speed of the take-up roller, which governs the time of exposure of the paper to the blast, will be found satisfactory if it draws the paper. 18 continuously and steadily across the blast at the rate of two to six feet per minute, guided in its delivery in a horizontal plane by the freely rotatable guide rollers described, and supported from the rear side by the plate 11 which "is of the width of the roll of paper and is supported by its opposite ends insuitable openings in the frame element 9 before mentioned.

The initial charge of sand is supplied to the hopper, above the screen, by removing the cover 12; while any powder therefrominto the sand chamber l of the air-nozzle plate.

lln applying my novel method for treating coated and calendered printing papers to attain the desired results stated, it will be observed that the exposure of the paper to the reducing action of the blast is a limited one because applied to a constantly moving and hence constantly changing portion of the roll, and is'very eflective to remove the gloss from the surface without the slightest injury to it; while the tautness of the paper effected by the take-up roller, maintained in a guided horizontal plane, by the guide rollers and the plate against which the rear side of the paper contacts in its let off motion, permits the reducing action stated to produce its results under conditions to effect a perfectly even as well as smooth surface of the aper so treated.

aving thus described my invention, T

claim 1. The process of treating coated calendered printing paper to remove the gloss,

while maintaining its calendered smoothness and evenness of surface, which consists in applying thereto the reducing action of a suitably applied sand blast, substantially as described.

2. The process of treating coated and calendered printing paper for the purposes described, which consists in subjecting the printing surface of the paper, under horizontally guided motion, to the action of a sand blast discharging in the path of the moving paper.

3. The process of treating coated and calendered printing paper for the purposes of removing its gloss without afi'ecting its calendered smoothness, and simultaneously imparting to it an even surface, which consists in imparting guided horizontal motion to the paper against a like supporting surface and in the path of a sand blast discharging transversely to the direction of the movement of the paper.

Tn testimony, whereof T have hereunto affixedmy signature this 19th day of December, A. D. 19213.

JULIUS S. i/VEYL.

Witnesses:

' Conn'rnn,

' TEIN,

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