US1935837A - Water extracting means for cylinder paper machines - Google Patents

Description

c. L. ELLIS Nov. 21, 1933.

WATER EXTRACTING MEANS FOR CYLINDER PAPER MACHINE Filed Jan. 25, 1932 gm: QQLQQUQUNwXVMMQ Patented Nov. 21, 1933 UNITED STATES PATENT OFFICE WATER rx'macrmo names For; CYLINDER PAPER MACHINES Application January 25, 1932. Serial No. 588,737

15 Claims.

This invention relates to cylinder paper machines, and more particularly to a means for reducing the water content of the formed web after completion of the forming operation and prior to its delivery to thepress end of the machine by means of a relatively heavy pressing operation. As is well known to those familiar with the art it is impossible to extract water from the formed paper web while in position on the felt on which it is formed by the apparatus now employed in cylinder paper machines; that is to say, wringer and primary press rolls, since there is a tendency of the expelled water to flow over the surface of the fibres and displace them, with a consequent loss of strength in the completed paper. It has, consequently, been the practice to press the web in the removal of water therefrom prior to the actual final pressing operations while disposed between two felts, for the reason that the use of the two felts tends to counteract to some extent the tendency of movement of water longitudinally of the web and consequent weakening thereof. Felts are, however, expensive and even with the addition of the top felt the speed at which the paper machine may be operated is relatively low.

An important object of this invention is the provision of an arrangement such that the web while still in position upon the'pick-up felt may be relatively heavily pressed and in which provision is made preventing longitudinal travel of expelled water on the web.

A further object of the invention is the provision of a structure of this character which will permit the heavy pressing operation referred to without marking or otherwise injuring the sheet.

A still further object of the invention is the provision of a structure of this character which may be substituted for the relatively expensive lorig top felt now in general use.

A further and more specific object of the invention is the provision of an arrangement such that the pick-up felt and the web carried thereby after leaving the cylinder molds and extractor presses, if the same be employed, are subjected'to heavy pressure between two press rolls which are accompanied at the nip and in advance of the nip by a wire, the wire being so positioned that it directly contacts with the web on the felt.

These and other objects I attain by the construction shown in the accompanying drawing wherein, for the purpose of illustration, I have shown a preferred embodiment of my invention and wherein:

Fig. 1 is a diagrammatic view showing the form-. ing end ofa cylinder 'paper or board machine (Cl. 9H2) having water extracting means constructed in accordance with my invention associated therewith; and

Fig. 2 is a fragmentary diagram similar to that of Fig. 1 showing a slight modification of the press structure of'Fig. 1.

Referring now to the drawing, the numeral 10 generally designates cylinder molds having couches 11 associated therewith, and 12 an endless felt between the cylinder molds and their associated couches to pick up a paper web 13 therefrom. The felt 12 is of the usual endless type and, if desired, may be passed immediately after its passage from the final cylinder mold through extractor presses 14 which, as indicated, are preferably of the wire-faced type disclosed in the prior application of Sutherland and Ellis, filed September 29, 1931, Serial No. 565,898. Leaving the cylinder molds or extractor presses 14, if same are employed, the felt passes in its return run over the cylinder molds to "the press end of the machine. At this time the web 13 is on the upper surface of the felt. The structure, insofar as just described, is illustrated in the prior application above referred to.

In accordance with the present invention, I provide at the press end of the felt, or that end at which the web 13 is discharged to the final pressing mechanism of the paper machine, a heavily weighted press 15 through which the felt and its associated web pass. The nip of the press roll likewise receives a wire 16, this wire passing about idler rolls 17 and through a washer generally designated at 18. One of the idler rolls 1'? is so disposed that that portion of the wire travelling toward and immediately preceding the nip of the rolls of .press 15 lies against the upper surface of the web 13. It will be obvious that-the pressure applied by rolls 15 will tend to force water from the web 13 and the felt l2 supporting the same. This water will tend to collect upon the upper surface of the web and to move longitudinally thereof. Since, however, the wire lies upon the upper surface of the web, the water must pass upwardly through the wire before it can partake of any longitudinal movement with relation to the web, and the wire which travels at the same speed as the web and felt will, therefore, act as an insulation preventing any erosive action and, consequently any displacement of the fibres by the displaced water. 4

In the form of the invention shown in Fig. 2, the structure just described has been modified to the extent that a plurality of presses are employed and the added press 15* is a suction press, the upper roll, or roll which confronts the web through the wire, being the suction roll and having its suction box 15 -so disposed that it operates directly upon the piled up water lying on the wire in advance of the nip of the rolls. By use of this construction the upper roll is enabled to act to a certain extent as a slice for the press. Where a combination of suction and ordinary presses such as illustrated in this figure is employed, the suction press is preferably, but not necessarily, arranged in advance as shown. It will, of course, be understood that both presses might be of the same type, either plain or suction presses. This figure likewise illustrates the use of suction rolls in lieu of the ordinary bottom press rolls, an arrangement which will provide somewhat increased efficiency of the combination illustrated.

Since the construction illustrated is capable of a considerable range of change and modification without in any manner departing from the spirit of my invention, I do not wish to be understood as limiting myself thereto except as hereinafter claimed.

I claim:

1. In a cylinder paper machine,the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run'passing over the cylinder mold with the paper web on its upper surface, of a press through which the return run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls.

2. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a press through which the return run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls, the upper roll of said press being a suction ro 3. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a press through which the return run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls, the upper roll of said press being a suction roll having an interiorly arranged suction box disposed to exert suction through the shell at and in advance of the nip of the press and to thereby remove water from the upper surface of the wire.

4. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a press through which the return run of the felt and the web carried thereby pass, a wire engaging the exposed surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls, and an extractor press including a wire-faced press roll directly engaging the web immediately after formation thereof and prior to its coaction with the first-named press.

5. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a press through which thereturn run of the felt and the web carried thereby pass, a wire engaging the exposed surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls, the upper roll of said press being a suction roll, and an extractor press including a wirefaced press roll directly engaging the web immediately after formation thereof and prior to its coaction with the first-named press.

6. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder moldwith the paper web on its upper surface, of a press through which the return run of the felt and the web carried thereby pass, a wire engaging the exposed surface of the web, said wire extending between the press rollsand being in contact with the web for a predetermined distance in advance of said press rolls, the upper roll of said press being a suction roll having an interiorly arranged suction box disposed to exert suction through the shell at and in advance of the nip of the press and to thereby remove water from the upper surface of the wire, and an extractor press including a wirefaced press roll directly engaging the web immediately after formation thereof and prior to its coaction with the first-named press.

'7. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a plurality of presses through which the return 11111 of the felt and web carried thereby pass and a wire engaging the exposed surface of the web, said wire contacting the web at and in advance of the nip of each of the presses.

8. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a plurality of presses through which the return run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire contacting the web at and in advance of the nip of each of the presses, one of said presses comprising a suction press having its suction roll opposed to'the web.

9. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a plurality of presses through which the return run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire contacting the web at and in advance of the nip of each of the presses, one of said presses comprising a suction press having its suction roll opposed to the web, said suction roll having an interiorly arranged suction box'disposed to exert suction through the shell at and in advance of the nip of the press.

10. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over,

the cylinder mold with the paper web on its upper surface, of a plurality of presses through which the return run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire contacting the web at and in advance of the nip of each of the presses, one of said presses comprising a suction press having its suction roll opposed to the web, said suction press being the .first to engage the web.

11. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, said felt in its return run passing over the cylinder mold with the paper web on its upper surface, of a plurality of presses through which the retum' run of the felt and the web carried thereby pass and a wire engaging the exposed surface of the web, said wire contacting the web at and in advance of the nip of each of the presses, one of said presses comprising a suction press having its suction roll opposed to the web, said suction roll having an interiorly arranged suction box disposed to exert suction' through the shell at and in advance of the nip of the press, said suction press being the first to engage the web.

12. The method of extracting water from the paper web formed by a cylinder paper machine while said web is still in position upon the pickup felt consisting in passing said felt and web with the web uppermost through a heavily weighted press while protecting the exposed face of the web during and immediately prior to its passage through the press by a foraminous shield.

13. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, an extractor press adjacent one end of the cylinder mold and including a wire-faced press roll directly engaging/the web immediately after formation thereof, means to guide the felt and web from the extractor press, over the cylinder mold to the opposite end of the cylinder mold, a press adjacent the last named end of the cylinder mold through which the felt and web pass, and a wire engaging the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls.

14. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, an extractor press adjacent one end of the cylinder mold and including a wire faced press roll directly engaging the web immediately after formation thereof, means to guide the felt and web from the extractor press, over the cylinder mold to the opposite end of the cylinder mold with the web on the upper surface of the felt, a press adjacent the last named end of the cylinder mold through which the felt and web pass, and a wire engaging the upper surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls.

15. In a cylinder paper machine, the combination with a cylinder mold and an endless felt associated therewith to pick up a paper web from the mold, an extractor press adjacent one end of the cylinder mold and including a wire faced press roll directly engaging the web immediately after formation thereof, means to guide the felt and web from the extractor press, over the cylinder mold to the opposite end of the cylinder mold .110 with the web on the upper surface of the felt, a press adjacent the last named end of the cylinder mold through which the felt and web pass, and a wire engaging the upper surface of the web, said wire extending between the press rolls and being in contact with the web for a predetermined distance in advance of said press rolls, the upper roll of the press being a suction roll having an interiorly arranged suction box disposed to exert suction through the shell at and in advance of the nip of the press and to thereby remove water from the upper surface of the wire.

CHARLES L. ELLIS.

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