US1712374A - Apparatus for making paper - Google Patents

Description

y 7, 1929 R. E. ARGY Q 1,712,374

APPARATUS FOR MAKING PAPER Filed July 9, 1928 wag.

J'ALJQ alum-$14.

Patented May 7,' 1929..

nits!) STATES earner ROBERT EDWARD .ARGY, 0F NIAGARA FALLS, NEW YORK.

APPARATUS FOR MAKING PAPER.

Application filed July 9, 1928. Serial No. 291,273.

er rolls, and in which the preheating treatment is effected in a novel and economical manner.

A further object of the invention is to provide novel apparatus for the manufacture of paper adapted to permit pre-heating the paper Web before the Web passes through the last set of wet presser rolls, and which is of a construction such as to permit existing paper machines to be modified to produce the improved apparatus in a simple, economical manner involving minimum alterations in the construction and operation of such existing paper machines.

lllith these objects in view and such others as may hereinafter appear, the invention consists in the improved method of making paper and in the apparatus hereinafter described and particularly defined in the claims at the end of this specification.

ln the drawing, a suthcient portion of the improved paper machine has been illustrated to enable the features of the present invention to be understood, wherein Figure 1 is a diagrammatic view illustrating the dry end of such a machine; and Fig. 2 is a planview illustrating the drive for the baby drier.

While the idea of subjecting a paper Web to pre-heating during the passage of the web through the paper machine prior to the time that it has completed its passage through the wet pressing apparatus, is not broadly new, nevertheless the arrangement of apparatus heretofore proposed for performing the pro-heating operation has in some instances involved the reconstruction and relocation of material parts of the paper machine. An arrangement heretofore proposed comprises that forming the subject matter of the patent to John C. Corcoran No. 1,690,402 granted November 6, 1928, to which reference may be made and which, in its preferred form includes a nest of three steam-heated cylinders and mechanism for driving the same. Such pre-heating cylinders were preferably interposed between the second and third pairs of wet, pressing apparatus 0 the paper ma- "ihg conducted to the first presses of the 'l ress rolls'of the chine, and the Web of paper was passed around the individual heating cylinders to be pre-heated before being passed through the last'wet presses. \Vhile such apparatus has performed its function satisfactorily, and While as a result of such pro-heating operation additional water was extracted by the last wet press roll with resulting econo" nnes 1n the steam consumed in final drying and in rendering possible an increased pro duction in the paper machine, nevertheless the installation of the nest of steam preheating drums usually necessitated relocation of the last pair of wet press rolls and other changes in the existing paper machine,

all of which involve considerable expense and inconvenience. In some paper mills the lack of room has presented a serious obstacle to the incorporation of the Corcoran preheating drums into the paper machine.

The present invention contemplates a paper machine in which novel provision is made for pie-heating the Web of paper be" fore it passes onto the final driers and prior to the time that it has completed its passage through the Wet pressing apparatus to the end that a maximum amount of water may be mechanically extracted or pressed from the Web and economy secured in the final drying operation. In accordance with the present invention existing paper machines may be conveniently and with minimum alteration adapted to the present arrangement and in many instances the present invention enables an existing paper machine to be equipped with means for preheating the paper W'Gb for the purpose described Where otherwise such a result would be impossible because of the lack of room and other difficulties attending the alteration of thepaper machine in themill ln addition the present paper machine enablesa superior finish to be imparted to the paper and improved folding qualities to be obtained.

In the drawing illustratingthe preferred form of the invention, asufficient portion of ,a paper machine has been therein illustrated toenable the invention to be understood,

and in which 10 represents the web of paper in the condition in which it exists after hav ing been formed in the usual way and i pressing apparatus. The paper web u ing its passage through the press rolls l2, A comprising the first presses is supported upon the usual form of felt 15, and a portion of the water is extracted by the press rolls 12, 14. Thereafter the web is conducted from the first presses toward the second presses down to a point adjacent one of the felt carrying rolls 16 and thence around the usual paper guide roll 17 from which it is conducted around the baby drier 20 and thence through a second set of wet press rolls 22, 24, and around the usual' guide roll 26 and over a guide roll 28 and thence around the successive steam-h eated drums 30 of the usual set of drying cylinders which perform the final drying operation.

The baby drier 2 0 is arranged to be driven in the direction of the arrow 31, reverse to its normal direction of rotation and at a speed synchronized with respect to the speed of the second set of wet press rolls 22, 24, so

as to maintain the web in an even smooth condltion during its passage over the baby I drier and through the wet press rolls. As

shown in Fig. 1, the normal direction of rotation of the baby drier 20 is indicated by the arrow 32. As herein shown the baby drier is arranged to be driven through a sprocket chain running around a pair of sprockets 36, 37 upon the baby drier and the felt carrying roll respectively, so that. the baby drier is driven in timed relation to the felt carrying roll and is arranged to preserve the linear speed of the aper to prevent the formation of irregularlties in the paper.

From the description thus 'far it will be observed that the only alteration required in adapting an existing paper machine of the type employing a baby drier to the present invention is that the direction of rotation of the baby drier be reversed and suitable provision made for driving the baby drier in such reverse directionand at a speed synchronized with the speed of the last wet press rolls.- These alterations may be made at a relatively small expense without seriously interfering with the continuance of the paper machine in o ration.

In addition to the simplicity with which an ordinary paper machine may bemodified to embody the resent invention, it has been observed that t e condition of the pa r web before passing onto the final set of iers is much drier than with the ordinary machine, and as a result economies in the steam consumption in the finaldriers may and a substantial increase in production for a given drier ca ty may be obtained. As an example of economies which may be obtained, in one paper machine prior to the embodiment of the present invention, the steam presure on the 'final driers averaged about 40 pounds, and after embodying the present invention satisfactory d mg was obtained utilizing only 30 pounds 0 steam in the driers. It was'fmmd ible to increase P the speed of the machine from 375 feet. per.

minute upto 425 feet minute before the steam pressure was rought back to 40 pounds, thereby in the production of with the present invention, produce an additional four tons of paper per day, amounting to a saving of approximately eighty dollars ($80.00) per day.

In addition to the economies resulting di rectly from the increased quantity of water mechanically extracted by the wet pressing apparatus, it has been found that the heating of the paper web before it enters the last wet press has somewhat the effect of a smoothing press. The paper is compressed somewhat in a warm state, thus increasing its strength and folding qualities, and improvin r the feel and surface of the paper.

t is to be understood that while it is preferred to heat the pro-heating roll with steam, nevertheless other means of heating may be used if desired. V

\Vhile the preferred embodiment of the invention has been illustratcdand described,

it will be understood that the invention may be embodied in other forms within the scope of the following claims.

1 Having thus described the invention, what is claimed is 1. In a paper machine, the combination with the last set of wet press rolls, of a bab drier, means for guiding the paper w .around the baby drier to pre-heat the same and then through said press rolls, and means for driving the baby drier in synchronism with said press rolls.

; 2. In a paper machine, the combination with the last set of wet press rolls, of a bah drier, means for guiding the paper w' under said press rolls and up around said baby drier to preheat theweb and thence through 'theres rolls, and means for rotating the baby drier in a direction revenue to its usual direction of-rotation and in synchronism with said press rolls.

3. In a paper machine, the combination with a set of drying rolls mounted in staggered relation, of t e last pair of wet pres rolls, means for guiding the paper web around the endmost d roll to pro-heat the same, and thence th said wet press rolls, and thence around second drying roll, and means for driving the endmost dryingls. roll in synchronism with said wet pres ro In testimony whereof I have signed my name to this specification. 'ROBEBT EDWARD ARGY.

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