US1723181A - Press for use in paper making - Google Patents

Description

1929. g, D. KELBERRY ,18

PRESS FOR USE IN PAPER MAKING Original Filed March 6, 1925 i E i i Patented Aug. 6, 1929.

. UNITED STATES GEORGE D. KILBEBBY, OF EAST DOWNIN GTOWN, PENNSYLVANIA, ASSIGNOR TO DOWN IN GTOWN MANUFACTURING COMPANY, OF DOWN ING'IOWN PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

PRESS FOR USE IN PAPER MAKING.

Application filed am -e,- 1925, Serial m. 13,629. Renewed January 5, 1928.

This invention relates to presses for use in pa er making, particularly presses of the type in which the paper, preferably with a carrier felt, is passed betweentwo rolls one of which is perforated for removing moisture and the other of which is a pressure roll for applying pressure to the perforated roll. As shown and as preferred, the perforated roll is provided with a' suction box for applying suction at the line of contact between the two rolls.

The principal object of the invention is to provide means whereby the pressure exerted on the paper between the two rolls will be kept more 'nearly uniform than has heretofore been the practice. More specifically, the object of the invention is to provide an improved construction for the rotatable shell of the perforated roll whereby more uniform pressure and other advantageous conditions are obtained.

In the accompanying drawing which illustrates one embodiment of the invention,

Fig. 1 is a side view illustrating somewhat diagrammatically a press of the type to which the invention is ap licable Fi 2 is an enlarged etail'ed view showing t e rotatable shell of the perforated roll;

Fig. 3 is a fragmentary sectional view taken along the line 3-3 of Fig. 2; and,

Fig. 4 is a still further enlarged fra mentary view showing in development tie afi'rimgement of the holes in the perforated s e 1.

Referring to the drawings, particularly Fig. 1, 1 represents the perforated roll as an entirety and 2 represents the pressure roll. Suitable provision is made for supporting and rotating the rolls, the support for the pressure roll being movable so that the roll can adjust itself to apply the required pressure to the perforated roll.

As to many of the details of construction except as hereinafter described, the perforated roll may be of any usual or desired construction, but it is preferably a suction roll and it may take the form shown in my copending application for suction rolls, Serial Number 699,421 filed March 15, 1924. In general, the roll comprises a rotatable outer shell 3, shown in detail in Figs. 2 and 3, and a non-rotatable suction box 4 which is mounted within the shell and arranged to apply suction to a segment of the shell at the line of contact with the roll 2- and throughout the effective length of the rolls. The suction box is suitably connected with a pump or other vacuum means, a pipe 5 being shown for this purpose.

After the paper has been formed in any suitable way, it moves between the rolls 1 and 2 ordinarily being carried by a felt 6.

Water from the wet paper is drawn through the felt into the suction roll and the ress roll 2 cooperates with the suction ro not only to press water out of the paper but also to smooth it and otherwise affect the texture.

As already stated, the shell 3 is perforated, it being provided with a large number of small holes which are uniformly distributed throughout the working area thereof. As most clearly shown in Fig. 4, the holes are arranged in rows A-A and B-B which are equally spaced angularly about the entire periphery of the shell. In each row, the

oles are spaced equally and the holes in alternate rows are staggered, preferably evenly. The spaces between alternate rows are considerably smaller than those between the holes in each row. The holes, therefore, can be considered as being at the apexes of contiguous rhombs aa and b-b having their major axes parallel with axis of the shell and, therefore, parallel with the line of contact between the shell and the ress roll.

The arrangement of holes as escribed is very important. Referring to Fi 4, if the line of contact between the two ro lls be considered as being' momentarily at one of the lines AA, it will be seen that there is a relatively lon section of metal between each two adjacent holes for supporting the paper and opposing the pressure of the press roll. If the line of contact be considered as now shifted to one of the lines BB, it will be seen that the same condition still exists, that is there is a relatively large amount of metal between the holes for supporting the paper and resisting the pressure. At all intermediate positions between any line AA and the adjacent line B-B, there is a similar favorable condition, that is, there is a relatively large amount of metal to support the fpaper without, however, losing the )enefit o the suction at or very close to the line of contact. Preferably the size of the holes is such that the holes in any two adjacent rows are at least tangent to an intermediate line such as 0-0. The edges of the holes may even overlap such a line as shown in the drawing. In order for the holes to overlap the intermediate line, it is necessary for the distance between alternate rows to be less than twice the diameter of the holes.

. By preference the holes should be so arranged that the distance between them will be as small as possible without seriously or disastrously weakening the roll. The arrangement of the holes should be such as to provide a substantially uniform aggregate.

length of contact between the perforated roll 1 and the pressure roll 2. As shown by Fig. 4, in the preferred embodiment of my invention, the holes in alternate rows can be spaced apart much less than the holes between each row. In this way variations in pressure will be avoided and the pressure will remain substantiallyuniform throughout.

According to prior practice, a very different relative spacing of the holes has been used wherein there were relatively large spaces between the longitudinal rows and relatively small spaces between the holes in each row. The result has been that when a row of holes came under the line of pressure, there was very little metal between the holes to resist the pressure and the paper was marked or otherwise disadvantageously affected and as the line of pressure shifted to a point between the rows of holes, there was continuous metal for supporting the paper and there was no suction at the line of contact. The result, therefore, was a constant shifting back and forth between a condition "of minimum support and maximum suction and a condition of maximum support and no suction. This disadvantageous condition is entirely avoided by my improved construction wherein the amount of suction and the amount of support for the paper remain substantially constant.

I claim:

A suction press roll having a multiplicity enoaen n. KILBERRY.

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