US1853068A - Paper making machine - Google Patents

Description

April 12, 1932l lw. H. MILLSPAUGH 1,853,068

PAPER MAKING MACHINE Filed Feb. 16 l93l v/cs INVENTOR Y BY M. 4J. @vl/MM ATTORNEY Patented pr. 12, 1932 UNITED VSTATES WILLIAM H. MILLSPAUGH, F SANDUSKY, OHIO PAPER MAKING MACHINE Application filed February 16, 1931.

The invention to be hereinafter described relates to paper making machines and particularly to that type of machine wherein *the .web is made by vacuum induced forma- In machines of this type I have used forming rolls each having two separate suction boxes or a box with two separate vacuum chambers or compartments. The two chambers are essential in the machines heretofore made because a low vacuum isA required for Erst-formation of the sheet i. e.-for collecting the fibres on the upwardly travelling wire as it passes through the stock. This has been very conclusively established. On the other hand, after the libres have been deposited and a web or layer formed, a higher vacuum may be and is advantageously applied to remove a further considerable proportion of the remaining moisture. In such machines, when a two-ply sheet was desired duplicate forming sections were used-right and left hand-the making wires being travelled convergingly to bring the sheets together for' bonding. The forming roll of each forming element had two chambers and a separate suction transfer roll was used to bond the two webs where they came together and to transfer the bonded sheet to a press felt to continue it through the machine.

The object of the present invention is to simplify two-ply and plural-ply machines of this general type eliminate some of the duplicate parts and give added functions to others, while at the same time providing a machine which will make the same two ply and plural ply papers with equal or greater economy and speed. In order to more clearly disclose the construction, operations and use of the invention reference should be had to the accompanying drawing forlning part of the present application.

The single figure of the drawing is a diagrammatic side elevation of one preferred form of a machine embodying the invention.

Referring to the drawing in detail, 1 and 2 indicate stock vats or flow boxes in the sides of which rotate or revolve in a vertically upward direction the vacuum forming rolls 3 Serial No. 516,006.

and 4, respectively. The roll 3 is provided with two vacuum chambers 5 and 6, chamber 5 extending from the line where the stock first contact the shell to a point considerably beyond the line where the roll emerges from the stock. The chamber 6 is contiguous to `5 and extends v*further around the circumference of the shell in the same direction. It

is only a small part of the width of chamber 5, as will be clearly seen. As will be readily understood, these chambers are part of a stationary suction box of well known construction and needing no detailed description here. The packing strips only, of the box are shown in the diagram to give the position and relative widths. The roll shell revolves about the box and in free running contact with its packing strips as is well understood. A making wire 7 is trained. about the roll 3 and travels with and around it and through the stock, in known manner. In the vat 2 roll 4 is similarly mounted. The suction box of roll 4, however, has only the chamber 8 corresponding to chamber 5 of the suction box of roll 3. In, both chambers 5 and 8 a low vacuum is used to col lect the fibres and form a loose layer or web on the travelling making wires 7 and 9 re spectively. IVire 9 instead of returning ver tically in a plane approximately parallel to that of its upward travel is run out horizontally about a turning roll 10 of well known construction which is positioned above the chamber 5 of roll 3. On its return about roll 10 the wire passes downwardly over and in contact with the roll 3 throughout the area 6 defined by chamber 6 and to an appreciable distance to either side thereof. 'lhence it continues on a downward incline to and about a small diameter turning roll from whence it drops vertically to the bottomturning roll 11 and then starts on its upward run. Thile crossing the area defined by the chamber 6, the web formed on and carried by wire 9 will be in Contact with and superposed on the web formed on and carried by wire 7. The vacuum maintained in chamber 6 is considerably higher than that in either chamber 5 or 3 and is particularly designed to bond the two webs into one homogeneous sheet and at the same time extract a large percentage of the remaining moisture. While these functions are being performed the vacuum action also draws the web of wire 9 from that wire and into compounded formation with the web on the wire 7--i. e. it transfers the web from wire 9. Briefly the chamber 6 simultaneously performs three distinct functions all of which, heretofore, have been separately and independently performed. It removes remaining moisture, bonds two webs into one, and transfers one web. i

Wire 7 on its vertical downward run after leaving wire 9 a little beyond chamber 6 carries with it the two-ply bonded homogeneous sheet. In its continued downward travel it passes about a lower turning roll 12 and then runs obliquely upward about an inner smaller wire roll 13 and back obliquely about a similar outer rolls 14 and then on up through the stock in vat 1.

A suction transfer roll 15 in the near end of a press felt 16 is so placed as to bring the press felt and the wire 7, at a point between rolls 12 and 13 in contact, the Contact area being so disposed as to over-lie the greater part of the area defined by the suction box chamber 17. It will be noticed, however, that the press felt leaves its contact with wire 7 just a little in advance of the point where it subsequently leaves the area defined by the chamber 17 Consequently the vacuum in chamber 17 acts to transfer the two-ply sheet from the wire to the press felt which, in turn carries the sheet ythrou h the first press 18.

Many changes may ie made in the construction, arrangement and disposition of the various parts of the invention within the scope of the appended claims without in any degree departing from the field of the invention and it is meant to include all such within this application wherein only preferred form has been disclosed for purely illustrative purposes.

Having thus described my invention what I claim and desire to protect by Letters Patent is 1. A paper making machine comprising two adjacent vacuum forming rolls, .a making wire trained about each roll, the wire of one roll extending horizontally from the top of said roll to a oint above the other roll and then being tralned partly about the other roll and means for transferring a web formed on the last named wire onto a web formed on the other wire.

2. A paper making machine comprising two vacuum forming rolls, a making wire trained about each roll, the wire of one roll extending horizontally from the top of said roll to a point above the. other roll and then being trained partly about the other roll, means for transferring a web formed on the last named wire onto a web formed on the other wire, a press felt, and a transfer roll for transferring the composite sheet from the final wire to said press felt.

3. A paper making machine comprising two vacuum forming rolls, a making wire trained about each roll, the Wire of one roll extending horizontally from the top of said roll to a point above the other roll and then being trained partly about the other roll, and means for simultaneously transferring a. web formed on the last named Wire onto and bonding` it with a web formed on the other wire.

4. A paper making machine comprising two vacuum forming rolls, a making wire trained about each roll, the wire of one roll extending horizontally from the top of said roll to a point above the other roll and then being trained partly about the other roll and means for simultaneously transferring a web formed on the last named wire onto and bonding it with a web formed on the other wire, and further reducing the moisture content of said combined webs.

5. A paper making machine comprising two vacuum forming rolls each provided with a suction box'having a chamber in which a relatively low or forming vacuum is maintained, a making wire trained about each of said rolls the wire of one roll extending horizontally from the top of said roll to a point Iabove the other roll and then being trained partly about the other roll, and a second vacuum chamber formed in the box of one of said rolls and adapted to have maintained therein a relatively high vacuum which acts upon the webs of the two making Wires at their areas of contact to simultaneously bond the two webs, to transfer one from its making wire, and to further reduce the moisture content of the two bonded webs.

6. A aper making machine comprising two horlzontally adjacent vacuum forming rolls, a making wire trained about each roll,

the wire of one roll being also trained partly about the other, and means for transferring a web formed on the last named wire onto a web formed on the other Wire.

7. A aper making machine comprising two horlzontally adjacent vacuum forming rolls, each provided with a suction box having a chamber in which a relatively low or forming vacuum is maintained and one of said suction boxes being provided with a chamber for relatively high vacuum, and a making wire trained about each roll, the wire of one lroll extending horizontally from the top of' said roll to a point above the other roll and then being trained across the entire effective area of high vacuum chamber of such other roll whereby a web is transferred from one wire on to a web on the other wire, the moisture content is simultaneously reduced in both by a single operation, and 'the two Webs are bonded into one homogeneous sheet.

8. A paper making machine `consisting of two horizontally adjacent vacuum forming rolls, a making wire trained about each roll, the wire of one roll being trained from the top of one roll partly about the top of the other roll and means for transferring a web formed on the last named'wire onto a web .formed on the other wire.

9. A paper making ,machine consisting of two horizontallyl adjacent rolls, a making wire trained about each roll, the wire of one roll being trained from the top of that roll to the top of the other roll and led from the adjacent side, and means for transferring a web formed on the last named wire on to a web formed on the other wire.

In testimony whereof I affix my signature.

WILLIAM H. MILLSPAUGH.

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