US1623436A

US1623436A - Moisture-testing means for paper-making machines

Info

Publication number: US1623436A
Application number: US117662A
Authority: US
Inventors: Frank A Peschl
Original assignee: International Paper Co
Current assignee: International Paper Co
Priority date: 1926-06-22
Filing date: 1926-06-22
Publication date: 1927-04-05
Anticipated expiration: 1944-04-05
Also published as: GB273230A; DE495994C

Description

F. A; PESCHL MOISTURE wms w me MEANS FoR TPAPER MAKING rmcruuss April 5 1927.

Filed June 22. 1926 4 Shets-Shee t 1 ATTUFNZYS A ril 5 1927.

p F. A. PESCHL MOISTURE TESTING MEANS FOR IAPER MAKING MACHINES Filed June 22, 1926 4 Shets-S'neet 2 A ril 5 1927.

p F. A. PESCHL MOISTURE TESTING MEANS FOR PAPER MAKING MACHINES 4 Shets-Sheet 5 iled June 22, 1926 Aprll 5, 1927. F. A PESCHL a 9 MOISTURE mswme MEAus FOB PAPER MAKING mom-mas Filed Jun; 22. 1926 4 Sheets-Sheet 4 Patented Apr. 5, 1927.

UNITED STATES FRANK A. PESCHTJ, OF JACKSON HEIGHTS, NEW YORK, ASSIGNOR TO INTERNATIONAL PAPER COMPANY, A CORPORATION OF NEW .YORK. I

I MOISTURE-TESTING MEANS FOR PAPER-MAKING MACHINESJ Application filed June 22, 1926. Serial No. 117,662.

This invention relates to paper making machines, and has reference more particularly to means cooperative with the travcling ,moist paper web, to indicate the moisture content of the same. Knowledge, available at any time, of the amount ofnioisture content in the web at any given point, is very desirable and important, since it discloses to the attendant or those in charge of the operation of the paper making machine, the condition of operation of the presses, the felts, the suction apparatus, etc. It shows if the presses are unevenly or otherwise improperly weighted, or if the felts are still high in their water removing qualities, as they should be. It shows also how much moisture enters the driers, and indicates various other conditions of operation, the knowledge of which makes it possible to effecteconomy in the operation of the machine and the maximum capacity in production.

therethrough of a current of electricity, which flow will be directly proportional to the moisture content of the web; and in accordance with the present invention, advantage is taken of this fact by the provision of a contactor member or shoe of improved form and construction, which is provided with spaced contact plates or surfaces adapted to rest on and contact with the traveling moist paper web. and whichcontact surfaces are connected in an electric circuit supplied with a suitable electric current. the sand circuit including an electric-current indieating instrument for indicating the amount of current passing. The electric current will flow from one contact surface of the contactor shoe to the other surface through I the greater the current flow and vice versa.

Also in accordance with the invention, 'means are provided, cooperative with the electric current being measured, for coin -'pensating for differences and variations in the acidity of the paper stock, so that notwithstanding .suc'h variations in acidity,

which frequently occur in the operation of; paper making machines, a true and accurate indication of the moisture content will be given.

The form and arrangement of the parts of the mechanism embodying the above de scribed characteristics, will be described in, i

, thereto.

Fig. 2 is a perspective view, on an enlarged scale, of the third press roll, the baby drier cylinder, and the first two maindrier cylinders. and showing the cont actor shoe applied to cooperate with the stretch of the paper web in its passage from the press rolls k to the baby drier. The present invention is based on the re- SiSiflDCGWlllCll a paper web offers to the flow Fig.3}; is a sectional view of the contactor shoe and a portion of the paper web, showing diagrammatically the passage of the electric current from one contact surface to the other, through the intervening portion of the web. 7

Fig. 4 is a front elevation, on an enlarged scale, of the con'tactor shoe and itssupport, certain parts being broken a'Wa'yto better show the construction.

Fig. 5 is a vertical sectional elevation through the lower portion'of Fig. 4.

Fig. 6 is a plan view of the contactor shoe.

Fig. 7 is a diagrammatic view of one form of means for the automatic compensation of variations in acidity of the paper stock.

Fig. 8 is a similar view of a form of acidity compensating means in which the compensation setting is effected manually.

Fig. 9 is a similar view of a different form of manually operated compensating means.-

Referring to the drawings:

Referring to Figs. 1 to 6, the paper making machine there shown comprises the usual flow box 1, the forming wire 2 in position to receive the paper stock or pulp from the flow box, the three presses 3, 4 and 5, the baby drier cylinder 6, and the main drier cylinder 7. 1

8 designates the contactor shoe, shown as restingon the stretch 9 of paper web where it passes from the third press -5 to thebaby drier cylinder 6, this being/the point in the machine where prefer to locate the. shoe for the application of the testing current.

connected with them, electric conductors 10 'and .11 respectively, constitutingan electric circui'tavhich is supplied with. an electric current from a suitable source A indicated diagrammatically in Fig. 1, said circuit having connectedfin it an electric-current indicating instrumeiifi ii such for instance as a galvanoineter, ampere-meter, milliampcre-meter, or the like. The instrument/in the form shown, is wrovided' with a pointer b actuated electricall by a coil 6 connected in the circuit constituted by the conductors 10 and 11.

In the operation of the. device,-the insulated contactor plates will maintain electric contact with the traveling moist pa er'web, and the electric'current will-flow ti om one contact late to the other and through the intervemn section of thex'web, and the amount 0 current passing'will-"be' indicated by the indicating'instrument,the latter showing a greater or less. flow of current accordmg to the moistureicontent of the webyth greater the-moisture content, the greater the flow of current, and vice versa. fr The detailed construction and formlofthe contactor shoe and manner-ofsupportin the samein-the machine is best shown'in igs.

4, 5 and 6, and will nowbe described": The contactor shoe is in'the form ofa-block or body 12formed of some insulating material such as bakelite or other-suitablecompose tion or material. The block is elongatedin the direction of travel of the paper web and is curved on its under surface, which presents a flat central portion13, and upwardly curved end portions 14, the purpose of which will presently appear. The contactor plates 8' and 8 before alluded to are set in the flat portion of the block and are arranged side y side parallel to each other with spaces 15 between adjacent plates, athere being in the present instance two plates 8 and three plates 8", altematingwith each other. These plates are vformed of some metal of good electric conducting quality such as copper, and their under surfaces are exposed on the un der surface of the block so as to contact electrically withthe surface of the paper 'web. The plates are fastened firmly in the block by'merns 'of fastening screws 16 extending downwardly through the block and engaged at their ends with the respective plates at opelectrically connected together by a metallic connecting strip 18 attached to the bolts 16 at one end of the plates; and the plates 8" are similarly connected together electrically by a metallic connecting strip 17 attached to the bolts 16 at the opposite ends of the plates 8 as best shown in Fig. 6, the electric conductor 10 being connected with the connecting strip 18, and the conductor 11 with the other strip' so as to connect the two series of contact plates in the electric circuit including the measuring instrument B.

v "The contactor block 12 is sup orted in the .maehine, as will be more in ly described later, so as to rest with a floating action on the traveling web, pressing the same down gently in a slightly curved form, which action is permitted by the curved end portions of the" block as above referred'to; and in such floating action of the block, the degree of pressure on the Web will not vary the area i of contact therewithof the contactor plates,

since said platesare confined to the central flat portion of the spoke,'and without regard to tie degree of pressure-ofthe block, the plates will always contactthronghout their, entire extent with the web. This insures a reliable and uniform action 6f the parts, and avoids the necessity of observing any par-.- ticular accuracy or nicety in the-setting of the contactor for operation. I y

The floating action of the contactor shoe same to an overhead support. 19b means of a transverse pivot bolt 20 which-1s extended 'through a bracket 21 fixed at its ends to the ends of the block, and throughears' 2211c, pending from said overhead su ort,*.vhere'- y the blockmay rock vertica y relatit' 'ely to saidsupportabout'a transverse axis dis,- posed centrally of the block, said' rocking motion being in a plane disposed in the di rection of travel of the paper web. The overhead support 19 'is provided withlaterally extending arms 23"co'nflected to and projecting in opposite directionsfrom, the depending cars 22, fron whicharms-extend ppwardly, two fixed vertical-gi iding rods 24 extending loosely through guiding openings in a cl-amping platew25. The plate'25 is clamped to the upper sides of two parallel spaced supporting bars 26 extending verselv across them'achi-ne between e press roll hand baby drier', which'bars are'fixed' referred a), is secured by connecting the trahsa at, their ends to the rear ends of bracket arms'27 which extend forwardly and are c nnec'ted at their ends to a transverse beam 2% fixedtolthe' upper ends of standards 29 r disposed at the sides of the machine, all as shown in Fig. 2. a.

The plate 25 is so clamped to theps up porting bars 26 as to permit of the'laterai adjustment of the contactor shoe along the supporting barstodifferent positions inthe Width of the paper web, so that the moisture content at any point in the web may be 'determined and thus an average for the entire lateral extent of the web arrived at. The

clamping of the plate to bring about this, connectingcontact plates 8 in said circuit,

object is effected in the present instance by means of a clamping frame applied to the undersides-of the supporting bars, from the ends of which frame, clamping bolts 31 extend upwardly, between the supporting bars and through the ends of the clamping plate and have clamping nuts 32 screwed on their upper ends, which nuts when screwed up will engage the upper side of the clamping plate.

In effecting the adjustment of the contactor shoe laterally .of the paper Web as above referred to, I prefer to employ a horizontal ad 'usting screw 33 mounted for rotation in earings in the rear ends of the arms 27, which screw is engaged in a threaded hole in a lug 34 extending rearwardly from the clamping plate 25, the said screw being provided with a crank 35 for turning it. It will be understood that in adjusting; the

contactor shoe laterally by the screw33, the

clamping plate 25 will'first be released by unscrewing the nuts 32, which. after the adjustment has been made, will again be tightened up to hold ,the parts in their adjusted position.

The overhead support 19 is so connected with the clamping plate that the support and consequently the contactor shoe may be adjusted vertically, and this in order to vary the degree of pressure of the shoe on the paper web to meet the conditionsencountered in the practical operation of the machme. 'lhisadjustment is effected in the ductor 11 is connected to one end of the contact strip 18 by a binding nut {10 applied to the upper extended end of, the fastening screw 16 at that end of ,the strip. thereby so that with the contactor shoe in operative position and with the

contact plates

8 and 8 inengagement with the traveling paper web, the circuit will flow through and between the adjacent plates and the portions of the web bridging the spaces between the plates, and the amount of the current flow, controlled and detern'iined by the degree of moisture in the web, will be indicated by the instrument B included in said circuit as hereinbefore described. A

It will be understood from the foregoing.

description that thetesting current does not traverse any metal part of the machine or machine frame. as it is not grounded through the machine, but passes [directly from one contact plate of the coniactor shoe to the other, and therefore is entirely independent uniformly and without interruption. and a reliahle indication of the same by the indicating instrument will be secured.

The peculiar design of the contactor shoe ,as described, exposes to the paperweb. a definite surfaceiof'contact.of the contactor plates, and the lower surface of the shoe is,

present instance by means of a vertical ad-. as before explained, so shaped as to press the justing, screw 36 engaged in. a central threaded hole inthe clamping plate and swiveled at its lower end as at 36" in the werhead support 19, the said screw having a hand wheel 37 fixed to its upper end for turning it in eflectingthe adjustments. A lock nut 38 is applied to the screw and is adapted, when screwed up, to bind against the upper side of the clamping plate and thereby lock the screw in its adjusted position. It will be-understood from the construction described that by turning the adone end of the} connecting strip 18 by a bind ing nut 39 applied to the upper extended end of the fastening screw 16 at.that end of the strip, whereb the contact plates 8 are con Dectedin the elctriccircuit; and the con- .web down in a slight depression or curve, and without regard to the degree of pressure of the shoe on the paper web, the area of contact of the plates in engagement with the web will always be the same. As the paper web is thin in cross section, it can pass only a certain amount of current, and therefore it is evident that it is not necessary for the contact shoe to press down v ry hard upon the web'in order to cause n12 current to pass therethrough.

The instrument for indicating theelirrent, will be preferably calibrated in percent moisture, and may be of the direct reading! and recording type, and in the form of a galvan'ometer, ampereymeter, milliamperemeter, or other suitable form of instrument for-indicating the passage of an electric'current.

As the contactor shoelcan be moved acrossthe machine as hereinbefore described. the {moisture content in any part of the sheet may beg determined. and ghe average throughout .the lateral extent f the sheet arrived at. a Or this average determmed. by

1 content, I have devised different forms of.

a series of contactors fixed at difierent points in the width of the sheet; or groups of con-' tactorscan be made up extending'partially or'entirely across the machine.

' It frequently happens, in the operation of paper making machines, that the acidity" v d 1ty in the stock. This device requires for its of the stock fed to the forming wire an going to make up the paper web, will vary, and in order to prevent such variations in acidity from causing a false indication by the measuring instrument of the moisture compensating devices to meet this condition, which are illustrated diagrammatically in Figs. 1, 7, 8- and 9, and will nowbe described.

On reference to Fig. 1 it will be seen that there is provided a small tank or vessel 42, in which circulates the paper stock from the flow box 1, through pipes 43 and 44. Immersed in the stock in this tank are two electrode plates 45 and: 46. An electric conductor 47 is connected 'atone'end with the electrode plate 45, and is connected at its I other end to the conductor 11 at a point be yond the instrument B; and an electric condoctor 48 is connected at one end to the electrode plate 46, and at its other end to the conductor 11 on the other side of the instrument B,'and between it and thecon; tactor shoe, these conductors thus constitut ing a branch circuit of the main circuit con: stituted by conduc'torslO and 11. By this arrangement the increased flow of the current, due to the acid condition of the stock,

is prevented from acting on the instrument B and causing said instrument to indicate a higher percentage of moisture in the. web.

than actually'exists, the eiicess current being diverted by

conductors

48 and 47 through the tank 42 and around the instrument, so as not to pass through and .act on the same". In this manner, whatever excess flow there is of the current due to variations in acidity, is prevented from acting on the indicating instrument, and the latter will therefore indicate the true moisture content w1thout .regard to the degree of acidity ex isting. i In Fig. 7 is illustrated another form of compensating device, In this case the arrangement is the same as that just described,

except; that the conductor 47 instead of be- 1 ing shunted around the instrument, is connected with a coil 49 incorporated in the instrument and wound in a direction opposite that of the actuating coilb of the instrument, so as to rippose the action of the coil 6 in operating he needle or pointer b. In this case the excess of current instead of being shunted around the instrument as in that first described, is caused to act on the instrument with a compensating effect.

In a furthermodified arrangement ofcompensating-device shown in Fig. 8, the tank the circuit according to the increase of acidsetting, a PFC-kfiOWlGdgG of the amount of acidity eXlStl11g.

The arrangement shown in Fig. 9 1llustrat-:

ing still another form, is based on the 'principle of operation of that shown in F1g.8

1. e.. a resistance regulated by hand is thrown in the circuit and the amount of resistance determinedby a pre-kn'owledgeof the degree of acidity existing. In this case however the resistance, is c nnected in series in the circuit, a coh'duc or 53 leading directly from the contactor shoe to the switch lever 52, and a conductor 47 leading directly from the resistance. 51 to the coil of the instrument B I y In all of the d'ilierent forms of compensating devices or arrangements described; means are provided whereby the increased flow of the current, due to increase in acidity, is-prevented from acting on themeasuring instrument to cause'it to indicate a false moisture content, whieh'would otherwise be indicated by reason of the action of the increased flow of currenton said instrument.

.In the foregoing description and accompanying drawings, I have set forth my in;

vention in the particular detailed form which I prefer; to adopt. 'It will be'pnderstood' however that these details may be variously 4 changed and modified, without departing from the limits of the invention; and that the invention is not limited to any particular 'form or construction of the parts, except in so far as such limitations are expressed inthe claims. 3

Having thus described my invention, what I claim is: r i

1. In a paper making machine, the-combination of means for supporting'the traveling 1 paper web, a contactor member provided with spaced contact surfaces insulated fromv each other, means for supporting said member in fixed relation to the travel of th'e'vleb and with said surfaces in contact therewith,

paper web and spaced transversely of its path of travel, an electric circuit including said contact surfaces, and an electric-current cuit. I

3. In a paper making machine, the combination of means for supporting the traveling paper web, a contactocmember provided with spaced contact plates insulated frorn each other, means for supporting said memher in fixed relation to the travel of the paper web--and with the plates in con actwith the web and parallel with its line of travel, an electric circuit including said contact plates and an electric-current indicating instrument included in said circuit.

In a paper making machine, the combination of means for supporting'the traveling paper W825 a contactor member provided with spac contact surfaces insulated from 'each other, and means for. giving floating support to said member on the paper web."

with the said surfaces in contact therewith; an electric "ircuit including said contact surfaces, an electric-current indicating instrument included in said circuit.

5. In a paper making machine, the combination of means for supporting the traveling paper web, a contactor member provided with spaced contact surfaces insulated from each other, means for supporting said contactor for rocking motion over the traveling paper Web, with said surfaces in contact therewith, an electric circuit including said contact surfaces, and an electric-current indicating instrument included in said circuit.

6. In a paper making machine, the combination of means for supporting the traveling paperweb, a contactor member provided with spaced contact surfaces insulated from eac other, means for supporting said con-- tactpr to rock vertically about a horizontal axis extending transversely of the direction Y of ravel of the paper web, with said conthe block over the traveling paper web with the exposed surfaces of the plates iucon tact with said web, an electric circuit including said contact plates, and an electricdurrent indicating instrument included in said circuit.

8. In a paper making machine, the combination of means for supporting the traveling paper web, a contactor member comprising a supporting block having its under surface flat at the central portion and curved at its ends upwardly to ride on the paper web,

and contact plates set in said block in spaced indicating instrumentIncluded in said cir-insulated relations with their under surfaces exposed at the central flat portion of the block, means for supportin the block over the paper web with the p ates in contact therewith, an electric circuit including said plates, and an electriccurrent indicating instrument included in said circuit.

9. In a paper making machine, the com- .of means for supporting the travel- :ing paper 'web, a contactor member comprising a supporting block, a plurality of spaced contact -plates set therein and insulated from each other and exposed on the underside of the block, said plates being electrically connected together in two series, with the plates of one series alternating with those of the other series, means for supporting the block over the paper web with the plates in'contact therewith, an electric circuit including saidtwo series of plates, and an electric-current indicating instrument included in said circuit.

10. In a. paper making machine, the combination of means for supporting the traveling paper web, a contactor member provided with spaced contact surfaces insulated from each other,-means for-supporting said memher. over the paper web, with said surfaces in' contact therewith, means for adjusting said contactor member vertically relative to the paper web, an electric circuit including said contact surfaces, and an electric-current indicating circuit.

11. In a paper making machine, the combination of means {or supporting the traveling paper web, a contactor member provided with spaced contact plates insulated from each' other, a support for said contactor member adjustable transversel of the paper instrument included in said tically in its support to and from the paperweb, an electric circuit including said contact plates, and an electric-current indicat ing instrument included in said circuit.

-web,'means for ad usting sai member ver 12. In a paper makiiig machine, the com- I 'bination of means for supporting the traveling paper web, a'fixed guide extending horizontally above and across the web, a contactor member adjustable on said ide and provided with contact surfaces 9. apted to contact with the traveling web, means on 4 3 gagin the contactor to adjust the same on its guide, an electric circuit including said contact surfaces, and an electric-current indicating instrument included in said circuit.

13. In a papermaking machine, the combination of means for supporting the traveling paperb, and means for indicating the moisture content of the paper web, said instrctch of the paper web at a point where said strip brid es the space between the last press and the baby drier.

14-.,,.ln a paper making machine, the comklicating means being applied to act on the bination of means tor supporting the traveling paper Web, and means independent of thewebsupporting means for indicating the moisture content of the paper web, saidgindicating means being applied'to act on the 4 upper'side of a stretch of .the paper web between two spaced supporting points.

15. In a paper makin machine, the combination of means for su porting the traveling paper web, electrically operated means cooperating with the web for indicating the moisture content thereof, and electrically actuated compensating means for said indicating means operating automatically in association with the indlcating means. to prevent variations in acidity of the stock from causing a false indication.

. 16. In a paper making machine, the combination of means for supporting the traveling paper web, a member provided with contac t plates to contact with the paper web, an

electric circuit in'cludings'aid plates to 'pass a current of electricity through the web, an electric-current indicating instrument included in said circuit, an electric circuit branching from said first mentioned circuit and operating automatically in association I with the indicatin' means to prevent variations in acidity o the stock from causing a false indicatiomand means whereby the resistance in said branch circuit may be varied in accordance with variations in the acidity of the paper stock;

17 In a paper making machine,-the com-' bination of means for support-ing'the traveling paper web, a member provided with contact plates to contact with the paper web,

an electric circuit including said plates tobination of-a flow box to contain a supply of the paper stock, means for supporting the traveling paper web, a member provided with contact plates to contact with said web,

an electric circuit including said plates to pass an electric circuit through the web, an electric-current indicating instrument in cluded in said circuit, a tank in communication'with the flow box and supplied with paper stock therefrom, electrodesimmersed in the stock in said tank, and an electric circuit branching from the first mentioned circuit and including said electrodes.

In testimony whereof, I have aflixed my signature hereto.

FRANK A. PESCHL.