US 3177799 A
Description (OCR text may contain errors)
April 13, 1965 E. J. JUSTUS ETAL 3,177,799
APPARATUS FOR SELECTIVELY TEMPERATURE CONDITIONING CALENDERS Filed Jan. 10, 1965 2 Sheets-Sheet 1 INVENTORS 5066/? J. Jusrus BY ELMER E. CR/ST A r T( )RNE YS April 13, 1965 J. JUSTUS ETAL APPARATUS FOR SELECTIVELY TEMPERATURE CONDITIONING CALENDERS 2 Sheets-Sheet 2 Filed Jan. 10, 1963 INVENTORS EDGAR JJus-rus BY ELMER E. CR/ST the nips.
United States Patent O 3,177,7 99 APPARATUS FOR SELECTIVELY TEMPERATURE CONDITIONING CALENDERS Edgar J. Justus and Elmer E. Crist, Beloit, Wis., assignors to Beloit Corporation, Beloit, Wis, a corporation of Wisconsin Filed Jan. 10, 1963, Ser. No. 250,609 17 Claims. (Cl. 100-93) The present invention relates to selectively conditioning the rolls of machines wherein the rolls press, smooth,
iron, and the like, a strip of material passing between the rotating roll and an opposing member, and more particularly concerns an improved apparatus for selectively conditioning circumferential areas of rolls to improve nip pressure control thereof and having special utility in calenders.
In the operation of paper machine or paper converting machine calenders, as is well known and understood in the art, the paper web is compacted to some extent to give it a fine smooth finish. This effect is obtained on both sides of the paper by the use of friction and pressure as the paper web travels between a plurality of the vertieally aligned calender rolls. One or more of the calender rolls is driven and the drive arrangement is such that there is a certain amount of slip between the rolls at each of the nips defined thereby so that a substantial amount of friction acts on the paper as it passes through A controlled amount of pressure is also applied.
It has long been a problem in the art for the person supervising operation of the calender rolls, or the backtender as he is commonly designated, to control accurately his calender stack in order to produce a good reel of paper.
Sections of a roll of paper or board winding upon a reel spool or bar from the calender at the end of a paper 1 making machine exhibit hard or soft characteristics depending upon the effective thickness of the web at that section. Paper or board is not produced in perfectly uniform thickness, despite long time efforts to do 50. Such differences in thickness, too small to be practically measured, show on the wound roll due tojthe cumulative effect of many layers. The backtender is thus able to detect such hard or soft sections, in the causitive thickness differences by the pressure of his hand or rapping the winding roll with a light stick.
I-Ieretofore, it has been suggested to direct air streams against the calender rolls to compensate for such thickness variations. Normal procedure has been for the backtender, after running his hand over the reel, sounding it and then judging the variations, to make corrections to the paper by directing air jets against the calender rolls to change the diameter thereof. If a soft spot was detected, denoting low caliper, the backtender would direct a jet of cool air against one or more calender rolls at the. location of thesoft spot, to decrease the roll diameter to the right degree to thereby obtain a sound roll. However, this technique requires considerable experience, judgment and skill and is far from an easy task to perform.
In order to overcome the prior deficiencies in this respect, and to facilitate conditioning of selected circumferential areas of the calender rolls, apparatus as set forth in Patent No. 2,993,432 dated July 25, 1961 and assigned to the same assignee as the present application has proved advantageous. .According to such apparatus, an air duct is provided by the back of the calender doctor, and a plurality of spaced air outlets are provided therealong at close, fixed intervals and controlled by means of individual valves to direct selectively streams ofair at selected locations along the calender roll. However, the
v3,177,799 Patented Apr. 13, 1965 present applicants have observed that in the patented structure, in actual practice, often as many as i of the available air nozzles are unemployed and thus dormant. Moreover, such nozzles have supplied heating or cooling air in relatively low volume and low velocities. Often calender rolls have been internally heated, as by steam, to increase the available temperature differences and hence the changes in diameter. Further, when the particular peripheral area or segment of the roll which requires temperature conditioning lies somewhere between two nozzles, it is not possible to direct the conditioning fluid stream directly onto such peripheral segment or area. This reduces the conditioning effect and thereby the efiiciency attained by the apparatus.
Modern high speed machines require markedly greater heat transfer to accomplish the desired results. By the present invention significantly greater heat transfer in achieved so that response time of the correction is reduced and correction is readily maintained.
It is, accordingly, an important object of the present invention to effect substantial improvements in the selee-.
and improved apparatus for effecting localized temperature control for calender and like rolls wherein the selected peripheral area of the roll is subjected to a plurality of circumferentially spaced small conditioning fluid streams and thereby affording highly concentrated, efficient temperature conditioning.
Still another object of the invention is to provide an improved apparatus for fluid temperature conditioning calender and like rolls greatly facilitating cooling or heating any selected segmental or peripheral area of the roll.
A yet further object of the invention is to provide new and improved apparatus for selectively temperature conditioning calenders substantially reducing the required amount of equipment andmore eficiently. utilizing the components of the apparatus.
Other objects, features and advantages of the present invention will be readily apparent from the following detailed description of a preferred embodiment thereof, as shown in the accompanying drawings, wherein:
FIGURE 1 is adiagrammatic view showing a calender stack embodying the present invention; I
FIGURE 2 is an enlarged fragmentary sectional elevational view showing a doctor back and one of the conditioning fluid projectors mounted thereon; and. FIGURE 3 is a fragmentary illustrative elevational view, on a reduced scale, taken substantially on the line IIIIII of FIGURE 2. 1
In the exemplary, diagrammatic illustration of a calendar stack 5 in FIGURE 1, a plurality of superimposed calendar rolls 7 to 11, inclusive are of proper respective diameters, direction and speed of rotation, internally heated or not, as required, to process a paper web W as it passes over thetop roll 7 and successively in serpentine fashion through the nips defined by the rolls 7 and 8, then 8 and 9, then 9 and 10, and finally 10 and'the bottom roll 11 from whence the web moves out to the companion rolls to curverthe detected unevenness or caliper defect.
This is accomplished by directing hot or cold roll conditioning fluid against the selected peripheral area or areas of one or more of the calendar rolls, herein shown as the, so-tO-speak, in-between rolls 8 and it through the medium of movably adjustable fluid projectors operatively mounted adjacent to the affected rolls. These fluid projectors 12 are constructed and arranged to be adjusted longitudinally of the rolls toward which trained for attaining impingement of roll-conditioning fluid directly centered on the circumferential roll area tobe modified in diameter, whereby the oblique or sideward orlateral flow of conditioning fluid along the roll surface as depended upon in prior devices is avoided and efiiciency increased with less expenditure of the conditioning fluid. In addition, the fluid projectors 12 are in the form of self-contained units of relatively small, lightweight, rugged construction which can be quickly and easily mounted or removed from supporting structure, so that will just a few of the projectors, rolls of substantial length can be locally conditioned since at any given time only a fractional portion of the length of a subject roll need be treated.
Conveniently, the fluid projectors 12 are mounted on a doctor back 13 which carries a doctor blade 14 disposed V in close running relation to the particular roll with which it is associated and at the off-running side of the lower nip of that roll. In'FIGURE 1, one of the doctor backs 13 and its doctor blade 14 is shown in association with the intermediate roll 8 in the upper portion of the stack and another of the doctor backs 13 and its doctor blade 14 is shown in association with the intermediate roll in the lower portion of the stack. Any controlled variation in selected area diameter of either of the rolls 8 or 10 will, of course, be reflected in the nips' defined with 'both of the upper and lower rolls companion to the affected roll.
In keeping with'one of the important purposes of the present invention to reduce the amount of equipment necessary while improving efliciency, means are provided for supplying the fluid projectors 12 with either hot or cold roll-conditioning fluid, the hot fluid being employed when localized diameter enlargement is desired and the cold fluid being employed when localized reduction in diameter is desired. Both hot and cold fluid supplies are provided conveniently accessible to all of thefluid projec-- tors 12' in association with the calendar stack 5. Desirably, one of the doctor backs 13 carries a supply of hot fluid'such as hot air' or other gas, steam, or a combination thereof .supplied'from a suitable source 15, and the other doctor back 13 carries a supply of cold fluid such as cold air or other gas, cold vapor, or a combina tion of the same which may be supplied from a suitable 'source 17. While either of thedoctor backs may provideeither of the fluid supplies, a desirable arrangement has the upper of the doctor backs supplying the hot fluid and the lower of the doctor backs 13 supplying the cold fluid;
By preference, each of the doctor backs 13 provides a rollconditioning fluid manifold lltlextending, together Withjthe associated doctorback throughout the effective length'of the companion calender roll. Toenable connection of the'treating fluid projectors 12 thereto, each of.
the manifolds 18 has a suitable series of spaced nipples 19 projecting therefrom to which respective flexible hose conduits 20 leading from the-projectors are detachably connectable. The construction and arrangement of the connecting hoses 2t and the detachable connections thereof with the. nipples 19- are such that, as shown in the full line and dash line positions in FIGURE 1, the connecting hose 2t) of any of the projectors 12 on either the upper or lower doctor back 13 may selectively or alternatively be attached to the hot or cold fluid supply manifold to meet the immediate requirements for roll conditioning, whether heating or cooling for either of the calender rolls 8 or 10. The advantages of such versatility are apparent.
Referring now to FIGURE 2, details of structure illustrated in greater particularity are equally applicable to either the upper or lower doctor back and roll-condi tioning fluid projector assemblies. In a rugged, economical construction, the doctor back 13 is in the form of a hollow beam comprising an angular cross-section body member 21 providing a rear wall and a bottom wall and to which are secured a complementary beam angle member 22 affording a topwall portion secured as by welding 23 to the upper edge of the rear wall of the body member 21 and a forward wall secured as by welding 24 to the bottom wall of the body member, spaced' inwardly from the edge of the bottom wall toafford a.
marginal lip flange 25 that projects a limited distance forwardly and downwardly as shown. To the underside of the lip flange 25 is secured the rear marginal portion of the doctor blade 14 as by means of a clamping strip plate 27 and attachment bolts 28. It will be appreciated that this construction affords a relatively light-weight but substantially rigid and rugged doctor back made from inexpensive angle iron components. At its opposite ends, the doctor back 13 is mounted in association with its companion calendar roll, for example the roll 10, by suitable attachment means to the calendar stack frame (not shown).
Although the hollow interior of the beam comprising the doctor back 13 could be used as a conditioning fluid reservoir or manifold, a more desirable arrangement employs the chamber within the beam as a housing for the manifold 18 which is in the form of a pipe whichmay be suitable metal and of an outside diameter to be received longitudinally within the chamber spaced from all of the walls so thatthere is an insulating air spacesub- .stantially entirely around the manifold pipe. This is especially desirable where the manifold supplies cold fluid. Any condensate that may develop on the exterior of the manifold pipe and drip therefrom will be gathered in the doctor back chamber on the bottom wall and drain off through either end of the doctor backer through suitable drain-off means that may be provided. Thereby dripping of any such condensate onto the paper web below the cold supply manifold is entirely precluded.
Preferably the manifold 18 extends substantially the whole length of the doctor back 13, and the nipples 19 project downwardly through suitable apertures 29 in the bottom wall of the body member 21. .Conveniently, the i nipples 19 are shortpipe lengths secured as bywelding 30 to the manifold pipe 18in alignment with respective outlet orifices 31 in the manifold. Respective insulating grommets 32 about the nipples 19 in the doctor back 7 wall orifices 29 avoid heat transfer between the nipples and the bottom Wall. It will be understood that any suitable connection (not shown) such as at oneend of the manifold 18 will be effected with the source of rolltreating fluid under suflicient pressure for the intended purpose.
Detachable connection of the flexible connecting hose Q ing a connection by simple manipulation whereby during connection of the coupling a fluid passage is opened between the nipple 19 and the connecting hose 20, and as an incident to uncoupling the hose 2t) the passage from the nipple 19 is effectively closed by the valve mechanism of the coupling. By having the hose 20 made from a heat insulating or at least a moisture repellent material such as a suitable plastic material of the so-called hydrophobic type any problem of condensation and dripping, where cold fluid is conveyed therethrough, or heat loss when hot fluid is conveyed therethrough is substantially avoided or at least satisfactorily minimized.
Each of the fluid projectors 12 is constructed as a small, lightweight, self-contained unit comprising a forward shoe portion 34 defining a plenum chamber 35 and having a roll-opposing wall 37 which is conformed in a concave curvature substantially to the curvature of the roll periphery so that streams of roll-conditioning fluid projecting through a spaced series of orifices 38 will impinge the roll surface squarely, that is on respective radii to the roll. In a practical form, the face 37 may be on the order of three inches wide and about four times as long, with the orifices 38 located at about three inch spaced intervals centrally along the length of the face, each orifice having a discharge end opening of about inch diameter. Spacing of the face 37 from the roll periphery is desirably about one inch. It will thus be apparent that the plurality of conditioning fluid streams from the orifices 38 impinging at substantial velocity over the substantial segmental portion of the peripheral area of the roll requiring treatment will effect quite rapid conditioning of the affected area due to the circumferential concentration of the numerous successive streams of conditioning fluid as the roll rotates.
For conveniently mounting the fluid projector 12 on the doctor back 13, the forward wall provided by the beam member 22 is set back toward the top of the beam by a slanted disposition substantially as shown whereby to accommodate between it and the roll periphery a downwardly projecting portion of the fluid projector shoe 34, while a rearwardly extending hollow arm 39 comprising an extension from the upper portion of the shoe is adapted to overlie the top of the doctor back beam so that an attachment bracket 40 on the lower portion of the arm can engage with a supporting rail or bar 41 carried rigidly by the upper rear portion of the doctor back beam, being secured thereto as by means of the welding 23. In a practical construction, the supporting bar 41 is a cylindrical rod or piece of pipe which extends throughout the length of the doctor back 13. To engage the bar 41, the bracket 40 is provided with a downwardly and forwardly opening notch 42 which will freely receive the bar 41 in slidable, pivotal engagement therein. It is thus easy to mount the fluid projector 12 on the bar 41, and adjustment both pivotally and longitudinally relative to the bar 41 enables properselected adjustment and placement of the shoe 34 and more particularly the fluid orifice face 37 thereof relative to the periphery of the associated roll to be treated. In the adjusted position, a suitable clamping or locking device such as a locking screw 43 threaded through the bracket 40 and manually operable by means of a handle t4 into locking engagement with the bar 41 fixes the projector until readjustment or removal is to be eflected.
Both the shoe 34!- and the arm 39 of the fluid projector are adapted to be fabricated integrally in one piece and are preferably made from an insulating material such as a plastic to minimize heat transfer and more particularly characterized to prevent condensation and dripping therefrom when the projector is utilized for cold conditioning the associated roll.
For convenience in handling the projector 12, it is equipped with a suitable handle 45, preferably mounted on the arm portion 39 and more particularly attached to the bracket 40 which may be constructed from suitable metal.
Attachment of the connecting hose 20 to the fluid projector 12 is to the rear end of the hollow arm 39, preferably through an interposed valve assembly 47 for controlling flow of fluid from the attached hose 20 into the projector through the arm 39. This valve assembly may be of any preferred construction such as a butterfly valve and has an operating handle 48 by which it can be adjusted to various degrees of opening from a closed condition.
In a practical installation, the supply nipples 19 from the manifold 18 are located at uniform intervals along the entire length of the manifold and the doctor back 13, as indicated fragmentarily in FIGURE 3. This spacing may be about twice the width of the individual fluid projectors 12 which are preferably of no greater width overall than the width of the shoe portion 34. Thus, where the projector shoes 34 are about three inches in width, the on-center spacing between the nipples 19 is about six inches. This enables the projectors 12 to be placed conveniently anywhere along the length of the doctor back 13, and a plurality of the projectors may be placed in side-by-side relation to cover a substantial length of the roll being treated, or a single one of the projectors 12 may be utilized, to meet any correctional requirements of the roll. For example, in FIGURE 3, two of the fluid projectors 12 are shown in side-by-side abutment, while a third is shown spaced from the abutting pair to meet a hypothetical correctional.requirement, but any desired adjustment in multiples or singly and in any number up to a full set of the projectors 12 may be used as in the judgment of the backtender is deemed necessary. Further, any desired gradiation of intensity of impingement of the conditioning fluid streams can be attained by appropriate adjustment of the control valves 47 associated with the respective projectors 12. Either hot or co d treating fluid may be impinged on the roll from anyone of the projectors 12 by the simple expedient of connecting its connecting hose with the nearest available nipple of the required supply manifold. If necessary, both hot and cold treatment of respective peripheral areas of the same roll canbe effected simultaneously. Virtually unlimited versatility to produce the most eflective temperature conditioning treatment of the roll periphery to attain accurate caliper in the paper web being calendered is thus provided by the present invention.
It will be understood that modifications and variations may be elfected without departing from the scope of the novel concepts of the present invention.
We claim as our invention: j
1. In a calender assembly including a stack of superimposed rolls providing web treating nips,
a projector unit of limited width having an orifice for projecting a stream of conditioning fluid against one of the calender rolls for altering the diameter of a selected circumferential area of the roll to control its nip for correcting a web caliper irregularity,
a support on which said projector unit is detachably mounted for. adjustment bodily both circumferentially and longitudinally of the roll to attain accurate orientation of said orifice for projection of said stream of conditioning fluid onto selected circum-.
ferential areas substantially throughout the length of the roll, i
and structure operating to maintain said projector in releasably adjusted position on the support.
2. In a calender assembly including a stack of superimposed calender rolls providing web treating nips liable to unevennesses causing caliper irregularity in the treated web and a doctor back associated with the off-running side of one of said rolls,
a projector unit of limited width having an orifice for projecting a stream of conditioning fluid against said one calender roll for altering the diameter of a nar- '7 row selected circumferential area of the roll to control its nip for correcting a Web caliper irregularity, projector supporting means on said doctor back mounting the projector unit for adjustment longitudinally along substantially the entire length of said one roll to attain accurate orientation of said orifice by in finite increments along the length of the roll and thereby accurate projection of the stream of conditioning fluid onto any selected longitudinal area of p the roll,
and means operating to maintain the adjusted position of the projector unit.
3. In calender apparatus,
a doctor back for supporting a doctor blade longitudinally in association with the circumference of a calender roll in a calender stack wherein the roll provides a web treating nip liable to unevennesses causing caliper irregularity in a web treated by the calender, V
. a fluid projector supporting structure carried by and extending longitudinally along the doctor back,
. a projector unit of limited width constructed to oppose a short portion of the length of the calender roll to direct roll conditioning fluid against the calender roll with which the doctor back is associated for altering the diameter of a selected circumferential area of the roll to control its nip for correcting a' web caliper irregularity;
and means for mounting said projector unit releasably for longitudinal adjustment bodily along substantially the entire length of the roll on said supporting means and maintaining the projector in any selected adjustment position.
- 4. ha calender structure,
a doctor back having means for supporting a doctor lade in association with a calender roll,
a supporting bar mounted longitudinally on the doctor back and having a circular perimeter,
and a roll-conditioning fluid projector unit having a a bracket engageable with said bar for adjustment about the curved perimeter of the bar and also for adjustment longitudinally along the bar in order to attain accurate disposition of the projector relative to an area of an associated calender roll requiring treatment by conditioning fluid directed thereagainst by the projector,
and releasable locking means'for locking said bracket to saidbar'in any adjusted position of the projector.
5. In calender structure,
a doctor back constructed and arranged for association with a roll of a calender stack,
a roll conditioning fluid projector unit,
means on the doctor back for supporting said projector-unit adjustable bodily longitudinally along the doctor back,
the doctor back having a fluid supply manifold,
and flexible conduit means adjustably movable with the projector 'unit and connecting said manifold with saidprojector unit to supply the projector unit with fluid from, the manifold in any adjusted position of the projectorunit.
6. In acalendar assembly including a stack of super imposed rolls providing web treating nips,
a hollow doctor back mounted in longitudinal association'with the off-running side of one of said rolls and having a longitudinal chamber therein defined by walls, V
means mounted on the outside of said doctor back to project conditioning fluid against said one roll,
a conditioning fluid manifold structure mounted in substantially insulating spaced relation to the Walls deflning'said'chamber in said doctor back,
and. means for connecting the manifold in fluid supply- 7. In apparatus for conditioning a treating roll by selectively subjecting a circumferential area of the roll 7 to a treating fluid to alter the diameter of the roll in such area for controlling the roll nip,
a manifold of a length to be disposed in adjacent longitudinal relation to the effective length of the roll,
said manifold having a series of spaced nipples for tapping a supply of conditioning fluid in the manifold,
a conditioning fluid projector,
a flexible he .3 attached to said projector,
means detachably supporting the projector adjacent to any selected one of said nipples for selective conditioning fluid projecting relation of the projector with respect to the roll,
and quick-disconnectable coupling means on said hose and on said nipples enabling connection of the hose with said adjacent nipple to afford conditioning fluid supply from the manifoldto the projector.
8. Apparatus as defined in claim 7, wherein the projector has valve means for controlling the conditioning fluid delivered thereto by said hose. 7
9. In a calender assembly including a stack of superimposed rolls providing Web treating nips,
a projector of substantially insulated construction for projecting a cold conditioning fluid against one of the calender rolls for altering the diameter of a selected circumferential area of the roll to control its nip for correcting a Web caliper irregularity,
' means for supporting the projector in association with said one roll, insulated means providing a supply of cold conditioning fluid, V
and substantially insulated means for connecting the projector with said supply means,
said projector and supply means and connecting means by reason of their insulated construction substantially preventing condensation thereon and thereby avoiding dripping of condensate therefrom.
10. In apparatus of the character described,
a conditioning fluid projector including a projector shoe portion having a front wall for opposing a roll to be treated, 7
said shoe portion defining therein a plenum space and being of a Width to oppose only a limited area of the length of the opposed roll,
said wall having orifices communicating with said plenum space to define streams or" roll-conditioning fluid from said plenum space,
a hollow arm portion on said projector extending rearone of said doctor backs providing a hot conditioning fluid manifold, the other of said doctor backs providing a. cold roll conditioning fluid manifold, respective sets of conditioning fluid projectors carried by each of said doctor backs and arranged for projectingconditioning fluid against the respective rolls to control the nips of said rolls for correcting .Web caliper irregularities,
and means for selectively connecting any of said projectors to either of said manifolds to project hot or cold conditioning fluid against the respective asso-' ciated roll in the area opposed by the projector.
wardly rrom the shoe portion and communicating 12. In a calender assembly including a stack of a plurality of superimposed rolls providing web treating nips,
a pair of vertically spaced doctor backs mounted in association with respective rolls of said stack,
one of said doctor backs providing a hot conditioning fluid manifold,
the other of said doctor backs providing a cold rollconditioning fluid manifold,
a respective conditioning fluid projector carried by each of said doctor backs and arranged for projecting conditioning fluid against the respective rolls to control the nips of said rolls for correcting web caliper irregularities,
and means for selectively connecting the respective projectors to either of said manifolds to project hot or cold conditioning fluid against the respective associated roll in the area opposed by the projector.
13. In apparatus of the character described,
a hollow doctor back constructed to be mounted in longitudinal association with the off-running side of a web treating roll of a calender stack,
means mounted on the outside of said doctor back to project conditioning fluid against said roll,
a conditioning fluid manifold structure mounted in substantially insulated relation within said doctor back,
said manifold structure having a communicating nipple structure extending therefrom and through a wall of the doctor back,
and a conduit connecting said nipple structure to said conditioning fluid projecting means for delivering conditioning fluid from the manifold to said means.
14. In apparatus of the character described,
means defining a conditioning fluid manifold arranged to be supported longitudinally adjacent to a roll of a paper web treating calender stack,
communication nipples extending at predetermined substantial intervals from said manifold,
a plurality of conditioning fluid projector units each of a spacing substantially less than the space between said nipples,
flexibleconduit means for connecting the projector units with said nipples to receive conditioning fluid from the manifold,
each of the projectors having at least one orifice for projecting conditioning fluid therefrom against a selecting narrow area of a roll of the stack,
and means adjustably supporting the projector units for contiguous or spaced relation with respect to one another along the roll to be conditioned.
15. Apparatus of the character described, comprising:
a set of individual conditioning fluid projecting units, means for supporting the units longitudinally along a calender roll,
means for securing the units releasably to said supporting means in selected positions of adjustment wherein the units may be contiguously related or variably spaced apart,
conditioning hot and cold fluid supply means,
and flexible conduit means for respectively connecting the units to either of the supply means.
16. Apparatus of the character described,
a conditioning fluid projector including a projector shoe having a front wall of substantial length for opposing a roll to be treated and having a curvature substantially complementary to the curvature of the roll,
said wall having a plurality of orifices extending in a series along the curvature of the Wall to project streams of fluid from within the projector substantially radially against the opposing roll surface,
and means for rockably supporting the projector shoe whereby various portions of the curved surface of c said wall can be adjustably spaced relative to the opposing surface of the roll to vary the distance which the respective streams of conditioning fluids from the orifices will travel from the wall to the opposed surface of the roll.
17. In apparatus of the character described for selectively temperature conditioning calender rolls,
a conditioning fluid projector comprising a small lightweight self-contained unit including a forward shoe portion defining a plenum chamber and having a roll-opposing wall which is conformed in concave cunvature substantially to the curvature of a calender roll periphery toward which conditioning fluid is to be directed,
said wall having a series of fluid impinging orifices spaced along its curvature,
said shoe portion and wall being on the order of three inches wide and about four times as long,
said orifices being located at about three inch spaced intervals eentrallyalong the length of the wall,
each orifice having a discharge end opening of about three-eighths inch diameter,
means for connecting the plenum chamber with a source of conditioning fluid,
and means for mounting the projector in operative position relative to a calender roll to be treated.
References Cited by the Examiner UNITED STATES PATENTS 334,415 1/86 Brewer -93 X 611,422 9/98 Savery 100-93 1,253,298 1/18 Temple et a1 10093 1,700,267 1/29 Kneel-and 10093 1,714,261 5/29 Egan et al 100--93 2,866,996 6/59 Krushe l5250.04 2,981,175 4/61 Goyette 10093 2,993,432 7/61 Youngchild 100-93 WALTER A. SCHEEL, Primary Examiner.