US 1790536 A
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Description (OCR text may contain errors)
Jan. 27, 1931. A. E. COFRIN 1,790,536
PAPER MAKING MACHINE Filed Jan. 22, 1927 2 Sheets-Sheet 1 INVENTOR. Audi 50192 A TTORNEYJ Jan. 27, 1931. co N 1,790,536
PAPER MAK ING MACHINE Filed Jan. 22, 1927 2 Sheets-Sheet 2 IN VEN TOR.
BY W W ATTORNEYS Patented Jan. 27, 1931 UNITED STATES AUSTIN" E. GOFRIN, OF GREEN BAY, WISCONSIN PAPER-MAKING MACHINE Application filed January 22, 1927. Serial No. 182,753.
The invention relates to paper making machines and has as an object the provision of a machine of the Fourdrinier type having tube rolls of a character adapted to lessen cen- Ql trifugal force acting upon the water passing through the Fourdrinier wire tending to carry the water upward through the wire, whereby disturbance of the forming sheet of paper upon the wire is caused in former machines.
It is a further object of the invention to provide a new form of tube roll for machines of this character.
Further objects of the invention will appear from the following description when 1 read in connection with the accompanying drawing showing illustrative embodiments of the invention and wherein,
Figure' 1 shows the old practice in machines of this character illustrating the effect of centrifugal force upon the water.
Fig. 2 is a diagrammatic side elevation of a machine showing one form of the invention for lessening such centrifugal force.
Fig. 3 is a like view of a modified form of tube roll, and 1 v Fig. 4 is a detail side elevation of a tube roll broken away to shorten its length, shown on anenlarged scale and showing the deckle straps in section.
It has been believed by those skilled in the present art that tube rolls remove the water rom the wire by drawing the water away from the lower side of the wire. It has been discovered by applicant that the centrifugal force produced by the surface of the tube roll coming into contact with the film of water upon the lower side of the wire, causes the water to be carried upwardly throu h the wire, producing a disturbance of the 1m of pulp carried by the upper surface of the wire,
which disturbance is indicated in Figure 1, at 10. The weaving of the fibers which is the object of delivering the pulp to the Fourdrinier wire is thereby broken up over each tube roll to a lessening degree over each successive roll and the weaving is thereby greatly interfered with, requiring a longer travel of the wire, and producin a poorer quality of paper than results if tliis centrifugal ac tion can be avoided.
in which bars are substituted for tubs rolls.
A second way of avoidin the centrifugal force is disclosed in applicants copending application, Serial No. 92,856, filed March 6,
1926, wherein the tube rolls are given a different rate of speed from that of the wire and which rolls may be combined with the bars described in applicants patent above named.
It is found as described in the present application that the centrifugal force can be avoided. or lessened so as to avoid its deleterious effects by giving to the tube rolls a diameter very much in excess of that of any tube rolls heretofore used. Such rolls are illustrated in Figure 2 of the drawing at 11. In this figure a breast roll is illustrated at 12, a Fourdrinier wire at 13,'a slice at 14, and suctlon boxes at 15, 16. A press roll is also shown at 17 and idlers at 18, 19.
The tube rolls 11 may be made of any size which can be utilized between the upper and lower runs of the wire. A size of 16 inches is found to produce satisfactory results. By use of rolls of this size, the centrifugal effect of the rolls is very greatly less than that of the rolls heretofore used, the largest of which, within the knowledge of applicant, has been of the order of six inches.
It is found that by the use of plain rolls of substantially the sixteen inch size the forming film of pulp upon the wire is disturbed but little.
A further modified form of the invention is shown in Figures 3 and 4.
In Figure 3 there are shown tube rolls at 20, a F ourdrinier wire at 13, a breast roll at'12, a deckle strap at 21 and deckle pulleys at 22, 23. In the form of roll illustrated in Figured and also shown as applied to the rolls 20 and the rolls 11, the surface of the roll is wound with a wire 24.
As shown more clearly in Figure 4, the wire 24 is wound closely over the ortions of the rolls ordinarily revolving be ow the deckle straps 21 and the turns of the wire are wound in spaced relation over the portion of the roll under the Fourdrinier Wire which carries the paper pulp. The wire 24 may be 5 as small as inch in diameter and the result of the use of this wire wrapping is that the Fourdrinier wire contacts with the effective surface of the tube roll through only a small proportion of its lower surface, thereby removing the efi'ect of centrifugal force of the body of the roll.
For pur oses of illustration the large rollers 11 of igure 2 are shown as provided with the wire winding but it is to be under- 15 stood that according to the provisions of the present invention, the rolls 11 will accomplish the object of the invention to a great extent without such surface wrapping.
With-the provision of the wrapping 24,
tube rolls of the ordinary size will accomplish the objects of the invention satisfactorily.
Minor changes in the physical embodiment of the invention may be made within the scope of the appended claims, without departing from the spirit thereof.
I claim 1. A paper making machine comprising, in combination, a Fourdrinier wire, tube rolls for supporting said wire, said tube rolls having a diameter suflicient to substantially reduce the effect of centrifugal force upon Water on the surfaces of the rolls whereby to substantially eliminate the deleterious effect of such water on the forming 'sheet.
2. A paper making machine comprising, in combination, a F ourdrinier wire, tube rolls supporting said wire, said tube rolls having a diameter of at least ten inches.
3.' A tube roll for paper making machines 40 having a diameter of at least sixteen inches whereby when said roll revolves at a peripheral speed equal to the lineal speed of a Fourdrinier wire in contact therewith, deleterious efl'ect of centrifugal force applied to Water on the surface of the roll, upon a forming sheet upon the wire will be avoided.
AUSTIN E. COFRIN.