US1991346A - Press section for fourdrinier paper machines - Google Patents

Description

F eb. 12, 1935.

C, L. ELLIS PRESS SECTION FOR- FOURDRINIER PAPER MACHINES Filed April `18, 1934 Patente.: Feb. 12,1935 Y l 1,991,346

UNITED STATES PATENT OFFICE Charles L. Ellis, Bradford Hills, Pa., assignor to powningtown Manufacturing Company, Downmgtown, Pa., a corporation of Pennsylvania yApplication April 18, 1934,v Serial No. 721,211

12 Claims. (Cl. 92-49) Y This invention relates to a press section for At the suction couch, the paper web is removed I Fourdrinier paper machines, and more particufrom the wire by a felt 12, this felt passing larly to an arrangementl permitting use in the through an extractor press comprising a lower press section of such machines of the extractor foraminous roll 13 and an upper solid roll 14 press. which is heavily Weighted, the paper web at this 5 The extractor press, a development now comtime being in contact with the foraminous roll. ing into extensive use in board machines, com- Beyond the extractor press from the couch a. prises a foraminousroll adapted to diretly consuction press 15 is disposed through which felt tact against the paper web, such roll being con- 12 likewise passes. A second felt 16 accompanies structed after the manner of the usual cylinder the felt 12 in its passage through suction press 10 mold of cylinder paper machines, but being made 15, and this felt serves to deliver the web to any much heavier so that it may withstand press subsequent presses which may be employed, such pressures, that is to say, pressures ranging beas that indicated at 17. tween 75 and 250 ponds to the linear inch. As hereinbefore stated, the web of Fourdrinier Such a press may be more efficiently employed machines is relatively light and has a tendency to 15 than the ordinary press, wherever the Water concling to the foraminous surface of the lower roll tent of the sheet and associated carrier is rela- 13 of the extractor press. In order that this web tively high, for the ordinary press having a plain may be removed from the extractor roll, a feltroll offers no means for the escape of water from covered roll 18 of small diameter is employed, this 20 the contacted sheet, and a sheet when too wet roll contacting the roll 13 at a point convenient- 20 will tend tooling thereto. Furthermore, the water ly spaced from the nip of the rolls 13 and 14, and extracted by pressure, if the speed of the press serving to doctor the paper web from the extractor be sufficiently high, will tend to crush the sheet, roll 13 so that it may be delivered to felt 16.

causing imperfections rendering it in many cases While in Fig. 1 the felt covering of roll 18 is unt for use. shown as being directly applied to this roll, such 25 At the present time extractor presses have not direct application is not essential, as a traveling come into use in Fourdrinier paper machines, felt surface of any type lfor the roll will accomdue primarily to the fact that the sheets proplish the same end, provided that leaving the duced on Fourdrinier machines are of light weight nip between the small roll and roll 13 the felt and have a tendency to cling to the foraminous surface follows the small roll. In Fig. 2 the felt 30 roll. e covering of the roll is provided by the felt 12--a An important object of this invention is the which corresponds to the felt 12 ofFig. 1, this provision of an arrangement permitting the use felt being passed about the roll 13 and about of an extractor roll in which diiiiculties resulting the surface of a small roll 18-a spaced from the from clinging of the sheet to the roll are eliminip between the rolls 13 and 14. This figure 35 nated. further illustrates a modification of the suction A further object of the invention is the simplipress arrangement illustrated in Fig. 1, in that flcation and promotion of the eiliciency rof the the felt 12--a does not pass through the suction press section of the Fourdrinier machines. press and the web is withdrawn from the felt 40 These and other objects I attain by the con- 12-a to the bottom felt 16a by means of a 40 struction shown in the accompanying drawing, suction felt roll 19. 'Ihe web thus contacts the l wherein for the purpose of illustration I have bare upper press roll of the suction press 15-a, shown preferred embodiments of my invention providing a more suitable arrangement for use and wherein: in mills making high grade light-weight papers.

Fg- 1 is a diagrammatic View 0f a Fourdrinier Since the construction is capable of consider- 45 machine having a prf-SS Section COIlStl'llCted in able modication without in any manner departaccordance With my invention; ing from the spirit of my invention, I do not wish Fg- 2 is a Similar View snowing a modified 9'1" to be understood as limiting myself thereto exrangement of the press section; and cept 'as hereinafter c1aimed Fig. 3 is a fragmentary perspective of the ex- I claim; 50 tractor T011 0f the DICSS- 1. In a Fourdrinier paper machine, the com- Referring 110W more Particularly t0 the dlaW- bination with a forming wire anda couch about ing. the numeral 10 generally designates the travwhich the wire passes, of a felt receiving thev Bling forming Wire 0f a Fourdrinier machine; and paper web from the wire at the couch, an ex- 11 a suction couch about which this wire passes. tractor press through which the felt passes, said extractor press comprising a lower foraminous roll, aheavily weighted top roll coacting therewith, the paper web being in direct contact with the ioraminous roll, a second press, and means to remove the web from said i'oraminous roll for delivery to said second press `co'mprising a roll of small diameter having a felt face.

2. A device as claimed in claim 1 wherein the felt face oi the small roll is directly attached to the roll.

3. A device as claimed in claim 1 wherein the felt face of the small roll is in the form of a traveling felt passed about the roll.

4. A device as claimed in claim 1 wherein the i'elt face oi' the small roll is provided by passing the extractor press felt about the face of the roll.

5. A device as claimed in claim 1 wherein the second press is a suction press having a traveling ie1t operating between the rolls thereof.

6. A device as claimed in claim 1 wherein the second press is a suction press about the upper roll of which the extractor press felt passes and a second i'elt passing through said suction press,

the paper web being between said felts at thel suction press.

7. In a paper machine, the combination with web-forming means of a felt receiving the paper web from the forming means,l an extractor press through which the felt passes, said extractor press comprising a lower foraminous roll, a heavily weighted top roll coacting therewith, the

paper web being in direct contact with the' felt face of the small roll is directly attached to the roll.

9. A device as claimed in claim 7 wherein the felt face of the small roll is in the form of a traveling felt passed about the roll.

10. A device as claimed in claim 7 wherein the felt face of the small roll is provided by passing the extractor press i'elt about the face of the roll.

1l. A device as claimed in claim 7 wherein the second press is a suction press having a traveling felt operating between the rolls thereof.

12. A device as claimed in claim 7 wherein the second press isa suction press about the upper roll oi' which the extractor press felt passes and a second felt passing through said suction press, the paper web being between said felts at the suction press.

CHARLES vL. ELLIS.

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