US1714238A - Paper-making machine - Google Patents

Description

y 1929- c. E. POPE PAPER MAKING MACHINE Filed April 21, 1923 2 Sheets-Sheet May 21, 1929. c. E. POPE 1,714,238

PAPER MAKING MACHINE Filed April 21, 1923 2v Sheets-Sheet 2 Patented May 21, 1929.

UNITED STATES 'PATENT OFFICE.

CHARLES E. POPE, DECEASED, LATE OF SPRINGFIELD, MASSACHUSETTS, BY MARY A.

Porn, EXECUTBIX, or SPRINGFIELD, MASSACHUSETTS, ASSIGNOR ro GREAT NORTHERN PAPER MAINE.

COMPANY, OF MILLINOGKET, MAINE, A. CORPORATION OF I'APER-MAKIHG MACHINE.

' Application filed April 21, 1923. Serial No. 633,809. I

Thisinvention relates to paper-making machines wherein the paper pulp is deposited, or the paper is made, on a rotating perforated cylinder and transferred to a traveling felt; and the invention has for its object to improve the construction and operation of cylinder paper-making machines.

Fig. 1 is a plan view of acylinder paper making machine'embodying the invention.

Fig. 2 is a sectional e evationof the machine of Fig. 1.

Fig. 3 is a sectional detail through the cylinder and a suction-box disposed therein at and above the level of the water in, the pulp-containing tank. I r

Fig. 4 is a detail of the cylinder in side elevation and partly in section.

As here shown, the cylinder paper-making machine ma include the pulp-contaim ing tank WlllCl'l maybe formed with a compartment having-the more or less semicircularly formed bottom wall 11; and a paper-making cylinder 12'is adapted to rotate in said compartment in spaced relation with the bottom wall thereof. One end of said tank ma be formed with a plurality 'of verticallyisposed passages13 arranged in communication at the upper and lower ends thereofand through which the pulp is adapted to flow from the pipe 14 into the cylinder-compartment. The bottom wall 11 of said cylinder-compartment may extend upwardly on the. pulp-entrance side ofthe tank to prvoide a. ledge ordam. 15 over which the pulp-bearing water is adapted to flow to enter said cylinder-compartment.,

The other endof said bottom wall 11 may also form a dam 16 over which surplus pulp may flow and pass into a compartment- 17 of said tank, from which it is conducted away. V

The paper-making cylinder 12 may be formed or provided with. the cylindrical shell 18 having the perforations or openings 19 through which water is adapted to flow freely.. A paper-makingwire 20 is adapted to cover the periphery ofsaid shellover the erforations 18,'thereof; and the paper-pulp is adapted to be laid or deposited on said wire as the pulp-containing water flows through the wire into the interior of the cylinder. The ends of said 'shell may be secured to end-plates 22, one of which may be provided with gear teeth 23 at its periphery which are adapted to mesh with a pinion. gear 24 carried by. a drive shaft 25, whereby" said cylinder may be rotated at a suitable speed. Said end plates 22 are or may be" formed .with openings 26 therethrough which communicate with the interior of the cylinder, and water which passes into the interior of the cylinder through the paper-making wire is or may be drained from the cylinder through said openings 26 and pass beyond the cylinder and tank through openings in the side walls of the tank, by gravity or suction. Said end-plates 22 are also formed or provided with hubs 27 having passages 28 therethrough in which a. stationarily-supported hollow shaft 30 is extended andon which said cylinder is rotatably-supported. The particular means of supporting and driving the cylinder is not important, so far as this invention is concerned, and other suitable means may be provided.

Said cylinder is adapted to rotate partially immersed in the pulp in said cylindercompartment. adapted to flow through the perforations in the cylinder and the pulp is continuously deposited in a layer on the periphery thereof as the cylinder is rotated. The pulp layer on the cylinder is moved above the water level in the cylinder compartment, which level may be substantially at or slightly above the top of the dam 16, and

The water in the pulp is is taken off by means including a traveling particles from the pulp la or may be thrown off the surface of the cylinder; and the resulting paper sheet may be formed with a plurality of small ope'nings and may be of uneven thickness and,ftherefore, highly im-.

satisfactory. To avoid this, it is usual to run the, cylinder at. such a slow peripheral speed that the paper output is low, compared to F ourdrinier machine making newspaper.

By applying suction through the shell of the cylinder to the paper at, and not below and for a suitable distance above the water level,'by the method herein described pulpparticles are largely prevented from being thrown off the paper sheet. and the sheet is much improved and, furthermore, the pc ripheral speed of the cylinder, and, consequently. the output of the machine maybe substantially increased.

For this purpose, the shell 18 of the cylinder is formed with a smooth cylindrical inner periphery and, a suction box' 35 is adapted to be stationarily-supported adjacent the inner periphery of said shell and acton the paper-layer on the outer periphery thereof through the perforations in the shell. Said suction box is or may be supported, at each end. by means including the horizontal pipes 36 which are threaded into saidbox and are also threaded into members 37. which latter are tixedly clamped or otherwise secured to said hollow shaft 30 and register with lateral openings therein \vherebv to establish communication between said shaft and the interior of the suction lMX. placed in communication with a suitable source of suction. not shown.

Said suction box may be adjusted toward or away from the inner periphery of the shell of said cylinder in any suitable manner, as, for instance. by rotating said pipes 36 in the )IOPQI direction, and the screw-threads at the ends thereof may be respectively right and left hand, for this purpose.

Said suction box in accordance with this invention, is adapted to be placed so that the bottom edge of the opening therein is approximately at-v the water line in the cylimler-compartment of the tank and so nearly all of the opening extends upwardly above the water line, whereby to exert a suction effect on the paper sheet immediately at and above the surface of the water, without at the same time pumping too much water. \Vith this. arrangement, as above stated, a better grade of paper is produced and the output of the machine may be increased as the suction etl'ect holds the pol particles to the cylinder unt-ilthey are 'su ficiently dry to adhere thereto without assistance.

Suction-devices have previously been used in connection with pulp forming cylinders running at low speed, and I do not claim broadly the useof'a suction device within a.

forming cylinder; but so far as I am aware the previous devices have not been designed to accomplish the work of holding the newly formed sheet; against the cylinder as it emerges from the water, and thusmaintain- Said hollow shaft 30 -is adapted to be mgth'e formed sheet on the wire against a high centrifugal force and the other peelingoti' forces.

The paper sheet is or may be removed from the paper-making cylinder by any suitable means as, for instance, a traveling felt 40, which is passed over a tension roll 41 and a couchroll 40 disposed at the upper part of the cylinder and adapted'to hold the felt in contact with the paper. sheet on the cylinder and pick up the paper sheet and transfer it, as formed, to'othercomponents of a paper-making machine, as'the press rolls, and the driers. Said felt is made to travel in the direction of and-substantially at the linear speed of the paper sheet on the cylinder.

The extent of suction to be used in the suction box above described must; not, be so great as to prevent the sheet from being be increased according to the speed of the machine.

What is claimed is-- 4 I A paper making machine having the combination of a pulp-containing tank having a cylinder compartment, apaper making cylinder rotatable in'said com artment having a horizontal perforatecylmdrical 'wall on which the paper sheet is made and being open at the ends of the cylinder substantially to the inner face of said cylindrical wall so that the water passing into the interior of the cylinder canpass freely horizontally out throughsaid open ends without forming a pool within the cylinder, 9. stationarilysupported hollow shaft constituting a support. on which said cylinder is rotatable, said cylinder compartment havinga pulp inlet and a dam oppositesaid inlet over the horizontal top edge of which surplus pulp is ada )ted to flow out of said compartment sai horizontal top edge being terminate slightly below the horizontal axis of said horizontal shaft, a suction box located within said cylinder against the inner face of said cylindrical wall, having its lower horipoint where the pulp sheet emerges from from the liquid level in said cylinder compartment and to hold the paper sheet intact on the cylinder against the washing effect of the liquid in the tank thereon at such point, said suction box having an opening at its rear wall which is 'in horizontal line with said hollow shaft, said shaft liaving an opening through its wall on the side of and in alignment with the opening in said suction box, a clamping member clamped about said shaft having an opening therein aligned and in communication with said shaft-opening, a horizontal suction pipe having right and left hand screw-threaded connections with said clamping member and said suction box in the openings thereof, the arrangement of said suction box, suction pipe and shaft being such that water and air can pass from suction box into said shaft at difierent levels without intermixing, and take-ofl' mechanism for the paper sheet including a travelling felt, and means 15 MARY A. POPE, Ezeautfia: of the will of Charles E. Pope.

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