US1895118A - Method and means for measuring material taken up by a treated web - Google Patents

Description

Jan. 24; 1933. AVALLEN 1,895,118 1 METHOD AND MEANS FOR MEASURING MATERIAL PA KEN UP BY A TREATED LWEB Original Filed Sept. 17, 1925 Patented Jam 24, 1933 UNIT-ED STATES PATENT. oF ics mam: man, or wmcrms'rnn, nssacnnsm'rs, nssrenon, nr mm: ASSIGN- mums, TO a'rnam'rc mcrsrou nwsraunnn'r consent, or nosron, mesa- ,cnusa'rrs, a coaro'nanon' or msacnusm'rs mnon AND MEANS FOR MATERIAL Tm UP I! HEATED WEB Application filed September 17, 1925, Serial No. 56,928. Renewed June 39, 1932.

This invention relates to a, method and apparatus for measuring the. amount of material picked up by a web, whether through absorption, surface coating, or both 'absor tion and coating. More particularly t 'e method and apparatus of this invention is a plicable for measurin such material when tl fe web is traveling so t at variations in the amount of-material picked up by different Commercial examples to which this pr s and apparatus are applicable maybe mentio'ned, such as'in the Jtreatin of fabric with ascertained by t waterproofing agents, as rub r, the saturation or coating of paper felt with asphalt or other bituminous material for roofing or flooring purposes, the saturating and coating of fabric b ses with linoleum or other compositions, and for various other purposes.

7 This measuring is accomplishe ent invention by measuring the runnin weight of the treatedweb material correc for the running weight of the untreated web. The measurement 'of the running weight of sheet material, whether the treated or untreatedweb, ma be readily and accurately he method and mechanism fully described and claimed in my a plication for Patent Serial N0. 27,32 7, filed, ay 1, 1925, Patent No. 1,708 074, April 9,1929, for indicating and controlling method and mechanism for paper making machines and the like, and in that application is also disclosed and claimed" a method and mechanism by which the running weightof certain constituents only of the materlal ma-y bemeasured, certain others (specificall disclosed .as the moisture content) being e iminated. In the present case the same general method of procedure is followed out, the running weiggt ,ofthe foundation-sheet'mater al or web "ing that constituent of the treated sheet manation 50 ,teriahwhich is'eliminated so'that determiof the weight of the treating agent alone is'efi in the pres In general the method employed is that] which vcomprises subjecting to the influence of the untreated-and the treated web separate devices of the same character each having -characteristics other than but dependent in value on the running weight of the particular material to the action of whichthey-are subjected, and determinin the amountiof such characteristics of the device xposedto the influence of the treated web corrected for the amount of such characteristics due to the uredby the other device, the final determination being calibrated in terms of the runnin weight of thetreating material alone.

ore specifically the method comprises passing the untreated web between a pair 'of spaced metal presence of the web foundation alone as'measplates, treating the material I and-.thempassmgthe treated material be f ties of which vary with the amount of sheet material therebetween at any instant; The capacities of these condensers ma then'be read by suitable means in terms 0 the running-wei ht of the material,- and-as one re resentst e total weight and'the other H; e

weight of the foundation or untreated web .alone overthe areas between the two pa rs pairof spaced metal lates,

of blades, their difference is the running a weight ofvthe treating materialalone.

A highly sensitive method for indicating changes in capacity between such condensers comprises employing the latter to' tune an oscillatory pick=up circuit near to the res'onance point of an exciting oscillator circuit and measuring the current induce For a more complete understanding of this invention, reference may be had to the accompanying drawing illustrating diagrammati-z.

cally an a paratus-by which e measurement may be e ected.

in the pick-up circuit, which'is a maxim when .the circuits are at resonance'and ,ecreases rapidly as the two circuits depart from resonance. l

between a pair of electro-conductive plates 1 and 2 held fixedly and spaced suflicientlv topermit .the web to. ass freely, the web thus forming part of t e dielectric between these plates. After passing between these .wplates it passes to a suitable treating mechanism by which the material with which it is to be treated is applied thereto.

a While the particular type of treating mechanism may depend on the nature of the web and of the-material to be applied afid also-on the purpose for which this application is intended, it is herein shown diagrammatically and for the purposefof illustration only as a tank 5 for containing a treating liquid. The web after passing between the plates 1 and 2 is shown as passing over a roller 6 and then down beneath thesurface of rollers ,7 and 8 and then upwardly out of the treating. tank and between a pair of squeeze rollers9 and 10 by which if desired the material may the fed. These squeeze rollers may, if desired, be adjustable so that they may have an effect to control the amount of treating material which is retained by the web. Any other means which might be found suitable in the particular instance, of course,

might be adopted for this purpose: After passing between these. squeeze rollers the web passes between the spaced metal plates and 16 which together with the treated web passing therebetween constitute a second.

electrical condenser. These lates 15 and 16 are held fixedly and space sufliciently to rmit the treated web to pass between them eel known form of high equency oscillatory electric circuit. Any suitable oscillating cir-.

-' cuit which should for best results be as stable as possible may be employed. As shown that employed is that of a low powered radio transmitter comprising a transmitting tube 20, a filament or A battery 21' and a plate or B battery 22, the plate circuit being'tuned throughan inductance 23 and a condenser 24 which may be variable for adjustin purposes. At 25. is shown a coil in in uctive relation to the coil 23 which is connected through a grid leak 26 with the tube grid 27. A resistance 28 is inserted adjacent to the B battery 22 as a protection device, and this is shunted by-means of a condenser 29 to provide a by-pass for high frequency currents.

' [-The plates 1 andf2 are shunted about the condenser 24 of j t'hex oscil latory sending or exciting circuit, andwith the treatedweb variable with changes in running weight of the treated web. Thistransmitter may be shielded as through a grounded'shield 30 and extending outwardly of the shield is a L 66 loop 31 forming a continuation of the :t-oil 23,

of treating liquid in. the tank 5 about a pair- 3 v At A is indicated diagzammatically a welltherebetween constitute a tuning element and with which the receivingor pick-up circuit B is loosely coupled.

The pick-up circuit comprises a coil 32 which receives the waves from the loop-31 and across this coil are shunted the variable tuning condensers 33 and 34, one of these being a Vernier condenser in order that fine tuning may be accomplished. Shunted about the condensers 33 and 34 are the condenser plates 15 and 16 and coupled in any suitable manner, as by the trans ormer coils 35 and 36, is a thermo-galvanometer or other current indicating instrument as at 40.

Assuming now a suitable constant frequency in the sending circuit A, and a constant capacity of the condenser comprising plates 1 and 2 and elements therebetwee'n, the

receiving circuit B'may be tuned to resonance.

therewith and when this is accomplished the current flow ,through the receiving circuit .B is a maximum, reading .on' the thermo galvanometer 40. Any variation of thecapacity of the condenser formed by the plates 15 and 16 due to change in the weight of the treated web will cause the receiving cir-' .cuit B to be thrown out of resonance with the sendin circuit A so that the current flow through t e receiving circuit will be deposed-treated web are due to changes in runnin weight of the treated 'web which clu es the web itself as well as the treating material picked up during its treatment, an

mi ht be due in part to variations in the we ght of the web alone. Variations in the weight of the web, however, are'taken care otby the condenser comprising the plates 1 and 2 between which the untreated web passes, any variation in the weight of the untreated web acting to change the tuning of the oscillatory sending circuit, so that by proper adjustment a tuning effect due to the running weight of the untreated web may-be caused to op ose the tuning efiect of the same web after it as been treated and as it passes between the condenser plates 15 and 16, so.

that the variations from resonance between the oscillatory sending and pick-up circuits may be caused entirely by variations in the running weight of the treating material which is picked up by the web.

While the pickup circuit may be. adjusted to be in resonance with the sending circuit so that readings of the instrument 40 are maintainedv at a maximum, this being done running weights, the reading of the thermogalvanometer 40 being held at the maximum point. I

From the foregoing description of an embodlment of this invention, it'should be evident that various changes and modifications might be made therein without departing from the 'splrlt or scope of this invention asdefined by the appended claims.

I claim:

1. The method of measuring the amountof with such material, which comprises measuring in terms of the running weight of such ished by the amountiof such characteristics i due to the web alone.

2. The method of determining the amount of material taken up by a web treated with tro-conducting elements,

such material, which comprises passing the untreated web between a pair of spaced electreating said web with such material, assing between a second pair ofs aced electro-conducting elements, and con inuou'sly indicating in terms of the weight of the'treating material taken'up by said web the capacity of said second pair of conducting elements and interposed treated web corrected for the running weight of said web by thecapacity and after. treatment between a of said first pair, of conducting elements and interposed untreated web.

3. The method of measuring the amount of material taken up by a traveling web treated with such material, which comprises treatment between one pair of spaced electro-conducting plates 4 passing such web before second pair of electro-conducting plates, tuning an exciting oscillatory electric circuit said first-plates and interposeduntreated web, and tuning a pick-up circuit by the caparity of said second pair of plates and interposed treated web -near resonance with said oscillatorycircuit, 'and measuring the induced current in said of the running weight of material picked up said-web; I 1 a f 4. An. apparatus of the class described terial to be treated, one pair of spaced elecadjustment of the condensers 33 and34,

material taken up by a traveling web treated the treated web by the capacity of pick-up circuit in terms comprising means for feeding a web of matro-conducting plates between which said web passes, means for treating the web with 'material, a second' pair of spaced electroconducting plates between which said treated web passes, an excitm oscillatory electrical circult tuned by said rst pair of plates and tinte osed treated web, a pick-up circuit terial taken up thereby diminished by the amount oi such characteristic due alone. a

6. The method of determining the amount of material taken up by a web treated with such material, which comprises inserting untreatedWeb material between a pair of spaced electro-condu'cting elements, inserting treated web material between a second pair of spaced electro-conducting elements, and in dicating in terms of the weight of said treating material taken up by said treated web the capacity of said second pair of conducting elements and interposed treated web corrected for the weight of web alone by the capacity of said first pairof conducting elements and interposed untreated web,

7. The method of measuring the amount of material, taken up by a web treated with such material, which comprises measuring cal. characteristics due to the web and mav in terms of such amount other characteris tics of the treated web amount diminished bythe said other characteristics of the web alone.

8. The method of measuring the amount of material taken up by a-web treated with such the difl'erenc'eof dielectric capacity of certain areas of said web before andv after being treated. p

10. The method oi measuring the amount to the web l dependent on such ofmaterial taken up by a traveling web,

indicating in which comprises continuousl erence between terms of such amount the di the dielectric capacities of successive areas of said web before and after its' treatment by such material. p I

ll/An apparatus of the class described, comprising means for'feeding a web of materi l to be treated a pair of spaced electroconductive plates passes,

'terial', a second pair of spaced electro-conbetween which said web means jor treating the .web with maj ductive plates between which said treated web passes, two oscillatory electric circuits each tuned by one of said pans of plates and interposed web andnear to resonance with each other, and means responsive to their nearness to resonance for indicating the weight of material taken up by said web. i 12. An apparatus of the class described comprising means for feeding a web of material to be treated, one pair of spaced electroconductive plates between which said web passes, means for treating the web with material, a second pair of spaced electroconductive plates between which said treated webpasses an exciting oscillatory electric circuit tuned by one of said pair of plates and interposed web, a pick-up circuit tuned to near resonance with said exciting circuit by the other pair of plates and interposed web, and

means for measuring the current flow in said pick-up circuit induced by sald exciting circuit.

13.; An apparatus of the class described comprising means for feeding a web to'be treated, a pair-of spaced electroconductive plates between which said web passes, means for treating said web with material, a second pair of spaced electroconductive plates be tween which said treated web passes, and means responsive to the capacities of said two pairs of plates and interposed web for indicating the amount of material taken up by said web. v D

In testimony whereof I have aifixed my signature. ALBERT ALLEN.

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