US1288641A - Coating-machine. - Google Patents

Description

s. w. MAYER.

COATING MACHINE.

' APPLICATION FILED MAR. 13. I917- Patented Dec. 24, 1918.

'2 SHEETS-SHEET s C. W. MAYER.

comma MACHINE. I

APPLICATION FILED MAR-13.1917" Y I Patented Dec. 24, 1918.

2 SHEETS-SHEET 2- IIE. Y-

l n I u l I n o I CHARLES W. MAYER, OF RQCHESTER, NEW YORK.

COATING-MACHINE.

Specification of Letters Patent.

- Patented Dec. 2 1, 1918.

Application filedmarch 13, 1917. Serial No. 154,441.

an improvement upon the. invention of my former Patent, No. 1,043,021, dated October adapted to produce either a single, thin coating, double coating, that is, coating on both sides, or producing full impregnation and all intermediate degrees of coating or impregnating, and is adapted to papers varying from light weight to the heaviest paper capable of being carried around the rolls and coated or impregnated.

The several ob ects of my invention will be evident to those skilled in the artfromthe following specification, claims and drawings, but I state the following main ones; First, to render the machine'capable of producing a substantially full impregnation on very heavy paper; and here it is to be stated that the machine is of such range that it will coat light weight paper with a very small amount of coating to the ream, and thence up to impregnating very heavy paper with an amount of material substantially equal to the weight of the paper itself, or coat or partially impregnate papers of the heaviest weight. Second, to improve the adjustment and control with reference to the coating or impregnating. I

Third, to improve the draft and chilling means, and thereby increase the speed and efficiency of operation, and by this is'meant that I at least double the speed of operation of the machine of my said former patent.

Fourth, to facilitate the threading of the paper into the machine. It is to be understood that my improvement is adaptable to coating webs or fabrics other than paper, and it is to be understood that wherever the term paper is used in this connection it is inclusive of such other uses.

In connection with the objects stated there are certain conditions imposed by physical laws which must be understood in order to It is furthermore, a machine .nor coating should be permitted to be affected physically to any appreciable degree from the time the coating is applied until it is chilled and set, or properly spread upon the surface of the paper by a finishing roll, because (and this is the physical law) heated wax or coating once applied and permitted tochill or cool to any appreciable degree before the final operation, never can be reheated or re-liquefied to return it to the condition when applied. This law applies whether the coatin is'to be given a gloss by chilling, or a dead finish by annealing.

Second, in making an impregnated or a. double coated paper, a' certain, definite, and also limited amount of time must-elapse between the final application. of wax or coating and the final chilling or setting.

Third, in the final chilling or setting of doublecoated 0r impregnated paper, the illi g or final setting from the second surface must immediately follow that of the first,otherwise one side of the paper will have a good finish, while the other side will have a poor finish. Moreover, this chilling must be done quickly and completely before the paper goes to the wind-up roll.

Referring to the drawings herewith, Figure 1 is a diagrammatic side View of my machine. Fig. 2 is an enlarged sectional detail of the first coating mechanism and impregnating mechanism. Fig. 3 is a detail plan view of the parts shown in Fig. 2, certain parts being omitted for clearness. Fig. 4 is a sectional diagrammatic view similar to Fig. 2 showing the parts in position for applying a light coat of wax or other coating.

I will first indicate the main parts of the machine and show the path or run of the paper when impregnation is bein effected. Referring especially to Fig. 1, the supply roll of paper, 1, is carried on a mandrel resting in adjustable bearings upon the frame of the machine. The paper thence passes over an idler 2 and'under an adjustable and subm'ersible idler 3, thence overthe coating roll 4, which rotates in a pan 15 containing the coating, kept hot in the usual manner, thence ing roll 7, which applies heated coating sub- "proper condition for chilling, that is to say,

to permit the physical distribution of the coating in connection with the fiber of the paper which requires a certainamount of time, thence over and about'the very large chilling and drawing-rolls 9 and 10, and finally to a friction-driven wind-up roll 11. .It

Willbe understood that the rolls 4, 6, 7, 9,

I and 10 areall positively/driven from a compensates the increase in diameter and'by its mon source of power in the well-known man neiaq-It will also be understood that the frictionwind-up roll 11 is power driven, and

that an interposed friction drive, such as shown in my said Patent ,N 0. 1,043,021, comadjusting means the wound upon it. It will also be understood that the coating roll 4 is always heated by steam or hot water connections that the pan in which it revolves is also always heated; that the roll 6 is heated if it is desired to double-coat or anneal or impregnate the paper, but is cooled with cold water if a gloss finish is desired in-making coated paper; that for doublecoating or impregnation the roll 7 and pan 8 are heated, but that for single coating the roll 7 is run cold and without coating in the pull upon the paper as pan 8. The rolls 9 and 10 are always run cold and kept cold by water circulation.

I will now describe the mechanism and operation when the machine is used to impregnate paper. Mounted on lugs 12 secured to the frame of the machine are guides 13,

. within which rack-toothed bars 14 are vertically movable. Pivoted near the lower ends of these bars is the submersible roll or idler 3. The bars 14 are so positioned that they are adjustable inside the coating pan 15 near its ends. Pivoted to the lugs.l2, or journaled therein, is a shaft 16 which has'rigidly mounted upon it the pinions 17, in mesh withthe racks of the bars 14, and the shaft 16 is provided with a crank 18 by which it may be rotated, and also with a clamp 19 (see F ig. 3) by which it may be lockedin any desired position. It will thus be seen that, by the parts just described, the submersible roll 3 may be moved in a vertical plane, parallel to the axis of the coating roll 4 and close to its surface, the purposes and advantages of which will hereafter more fully appear. In

this position the submersible idler or roll 3, where it is below the level of the coating (for it is, of course, understood that the coating pan 15 is filled sufficiently for the under side of the coating roll 4 to contact with and carry up the coating on its surface), the liquefied coating not only contacts and coats the paper upon its under side, but the coatingfiows in at the two ends of the loop of the paper looped under the idler 3 and coats the upper side of the paper as well; And it is also to be noted that, having the paper travel down and up manner in close. proximity to the coating roll 4, the paperitself is thoroughly heated, so that the capillary action carrying the coating into the fiber of the paper is much morev complete, because a very slight cooling of the coating by thick, cold paper materially reduces the free distribution, of the coating into the fiber of the paper.

:Wi'th this position of operation it is neeupon the web or to move it entirely out of in this contact when its use is to be dispensed with,

by means of an arm 22 provided with a slotted segment which can be locked to the adj acent bar 14 by means of a bolt and wing-nut. The paper passing over the coating roll 4 is, in this position, in contact with nearly onethird of its periphery and receives thorough saturation due to the heat of the roll and the coating carried by it. As it passes over the equalizer 5 the surplus coating is removed. The roll 6, being heated, tends to drive the coating into the pa erand when the paper reaches the roll 7, which takes heated coating from the pan 23, it is further charged with coating on the side opposite to that applied by the roll 4, and the equalizer 24 removes the surplus. I

In case the coating or impregnation has been sufficient by the rolls 3 and 4, the coating pan 23 maybe empty, the roll 7 heated, and the equalizer 24 will smooth out any coating pulled up as the paper passes over the rolls 6 and By these treatments the paper is not only thoroughly coated on both sides, but the heating has driven the coating well into the paper; and yet, if it were now and at once subjected to the action of the chilling rolls, the coating or impregnation would not be entirely uniform. This fact I have demonstrated repeatedly, and I have found that between the last treatment of coating or heating and the first action of chilling, a

positive, definite time element must enter in, as above stated, secured by placing the chilling rolls a very considerable distance from the equalizer 24. This distance must be approxiof the heat which mately seven mas er my invention is my improvement in the cooling or chilling means. The rolls 9 and 10 (see Fig. 1) are both drawing rolls, drawing the web through the machine,'.and are also the cooling or chilling rolls. They are much larger in diameter than any of the other rolls, and preferably travel at the same peripheral speed as the roll 6. They have thin walls and are fully supplied with cold water circulation, so as to absorb substantially all the rolls pick up from the coated or impregnated paper substantially as fast as the same is picked up. 'As shown,

the'paper contacts a little more than-onehalfthe periphery of the roll 9, and then makes nearly an equal contact with the roll 10. This gives. a much longer contact for chilling the coating, and these rolls being very large, the period of non-contact is similarly increased, so that the water has a very mu'ch greaterefiect'in removing the heat from the rolls.

already stated, that the action of the roll 10 And it is also important, as

' shall follow immediately the action of roll 9,

in order to secure equally good finish to both 7 sides of the paper.

Going now to the other extreme of adaptability of my invention, assume that it is desired to coat (not impregnate) a paper upon one side only and with the smallest amount of coating possible to secure an even and complete covering. The clamp 19 is released so that the crank 18 may be turned, and through the pinions 16 and the racks on the bars 14, the bars 14v are raised, bringing the roll 3 to the position shown in Fig. 4. In this position. the paper between the roll 3 and the equalizer 5 makes a very small contact with the coating roll 4, receiving the minimum amount of coating and reducing the amount of saturation or impregnation to the negligible point. The equalizer 5 acts as above described, and if it is desired to make a dead finish paper, the roll 6 is run hot; but if itis desired to make a high finish or glaze, the roll 6 is supplied with a cooling medium. The interchangeable use of a heating medium'or a cooling medium in a given roll is well known and fully disclosed in my said former patent. Leaving the roll 6 the paper contacts the roll 7, which may a web running a. vertically movable frame,

I be either hot or cold, thesame as roll but single coat ng of light paper-lie all of the modifications of impregnation, mg thelroll 3 adjustable in vertical plane and close to the roll 4. and the other means above single coatdescribed. I am aware that submerged rolls a web down into the coatingfor carrying have been used, but to my knowledge none of these has been adjustable to attain the ends which I'have described. Moreover, it

must be had in mind that my invention adapts the machine to such speeds as I have stated, while the prior machines just referred to operated at a speed of not more than seventy-five feet per minute.

Finally it is to be noted that .this inven tion embraces an improvement in threading the machine. When it is desired to thread in the end of a roll of paper, the roll 3 is elevated to the position shown in Fig. 4, and the paper is readily passed over the idler 2, under the roll 3, over the coating .roll 4, and so on; and then the roll 3 is lowered to the desired position.

Having thus claim 1. In a machine of the type described, the combination with means for carrying a web through the machine, and a coating roll, of an idler carried by said frame adjacent said coating roll, and

-.a scraper adjustably mounted on the frame to remove the surplus coating from the up-' described my invention, I

per side of the web after it passes under said 4 idler. 1

2. Tn a machine of the type described, the -comb1nati on with means for carrying a web an idler, a coating roll through the machine, and coating pan in which said coating roll rotates, of a submersible and adjustable roll vertically adjustable in a plane adjacent said coating roll, rack-toothed plates to which said adjustable roll is pivoted, guides for said plates, pinions engaging said teeth and -means for rotating said pinions, a scraper for removing the surplus coating from the upper'side of the paper after it passes under said submersible roll, a bar pivotedto said plates and carrying said scraper and .an arm and slotted segment for adjusting said scraper and for throwing it out of contact with said web when desired.

CHARLES w. YER.

70 double coating, made possible by having

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