US2793006A - Calender roll - Google Patents

Description

May 21, 1957 LE ROY EABY CALENDER ROLL 3 Sheets-Sheet 1.

Filed DeG. 1S, 1955 om NN NM .L

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N DvmOmO- m wm m.. n. m m m mmm. om t N NLIL . May 21,v 1957 LE ROY EABY CALENDER ROLL 3 Sheets-Sheet 2 Filed Dec. 1.5, 1953 en im INVENTDR LEROY EABY ATTORNEY LE ROY EABY CALENDER ROLL May 21, 1957 3 Sheets-Sheet 5 'Filed Dec. l5, 1953 United States Patent O CALENDER RLL LeRoy Eaby, Providence Township, Lancaster County, Pa., assignor to Armstrong Cork Company, Lancaster, Pa., a corporation of Pennsylvania Application December 15, 1953, Serial No. 398,353 7 Claims. (Ci. 257-95) In the operation of sheeting calender-s such as those currently used in the manufacture of oor and wall coverings, it is highly desirable to control the temperature on the surface of the roll within a very limited range in order to produce sheet material having the desired surface characteristics and the desired design effects.

One type of roll used for this purpose in calendering thermo-plastic materials is disclosed in United States Patent No. 2,498,662, issued February 28, 1950. The roll disclosed in this patent has a relatively thin outer shell provided with a plurality of annular channels disposed immediately beneath the working surface of the roll. The purpose of this arrangement of annular channels is to provide a system in which the temperature control flnid acts immediately on the working surface of the roll and prevents the entrapment of a large quantity of uid in the center of the roll where it is ineffective for controlling the temperature of the working surface of the roll.

The present invention relates to a mechanism for changing the amount of temperature control fluid directed to different areas of the roll surface in accordance with specic requirements. With the system of this invention, it is possible to maintain certain areas of the roll at temperatures different from the temperatures in other areas of the roll. For example, if desired, the ends of the roll may be operated at a different temperature from the intermediate section of the roll. Also, in instances where certain areas of the roll are subject to greater temperature fluctuation due to increased heat transmission, etc., it is possible to offset this fluctuation by directing a greater amount of heat control fluid through the heat control lluid passages in these areas. The system is, therefore, effective to maintain certain areas of the roll surface at different temperatures where the normal temperature of the roll surface is constant; or it may be used to maintain a constant temperature at all points on the roll surface when the normal temperature of the roll surface is not constant.

For example, in the calendering of asphalt tile, cold brine is circulated through the top or facing roll of the calender to keep the roll surface from getting too hot. However, if the rate of ow of brine is the same throughout the entire roll, the ends of the roll become too cold, with the result that the edges of the calendered sheet have different surface characteristics than the remainder of the sheet. To overcome this trouble caused by cold ends on the rolls, the device hereinafter disclosed has been utilized.

The system is suitable for the transfer of heating fluid or cooling uid through the roll, depending on the specic requirements of the product being formed into a sheet on the calender in which the roll is a component art. p In the system here under consideration, it is possible to transmit temperature control uid at different temperatures to different areas of the roll. This is done by dividing the Working area of the roll into zones and having ice a separate injector to supply Huid to each of these zones. The temperature can be controlled either by adjusting the valves supplying Huid to different zones or by supplying the same quantity of fluid but at a different temperature.

An object of this invention is to provide a system whereby it is possible to control the temperature of the surface of a calender roll by controlling the distribution of temperature control uid within the body of the roll.

Another object of this invention is to provide a calender roll in which the rate of How of temperature control fluid supplied to different areas of the roll can be controlled to vary the temperature at different areas of the roll at any given time.

In order that this invention may be more readily understood, it will be described in connection with the attached drawings, in which:

Figure 1 is a longitudinal cross sectional view of a calender roll with the injector mechanism attached thereto;

Figure 2 is a longitudinal cross sectional view of a calender roll taken on the line 2 2 of Figure 4 showing the internal passages for the introduction of temperature control fluid to the annular passages adjacent the surface of the roll;

Figure 3 is a cross sectional view taken on the line 3--3 of Figure 1; 1

Figure 4 is a cross sectional View taken on the line 4-4 of Figure 2;

Figures 5 and 6 are cross sectional views similar to Figures 1 and 2 but show a modification of the invention; and

Figure 7 is a view of a modification.

Referring to Figure l, there is shown a calender roll 2 having a relatively thin outer shell 3 provided with a plurality of annular channels 4 formed on the inner surface thereof. This outer shell 3 surrounds a central core 5 having a longitudinal central passage 6 carrying a plurality of concentric pipes. These pipes conduct the uid into the central part of the roll and remove it from the roll after it has circulated through the channels 4 `adjacent the working surface of the roll.

Referring to Figure 2, it will be seen that the cavity 6 forms a passage surrounding outer concentric pipe 7. This passage serves as the conduit for injecting the temperature control fluid into the roll bodiment of the invention.

Referring to Figure l, it will be seen that supply pipe 8 from a source not shown leads into a circular manifold 9 surrounding the end of the roll. It will be understoodY that the injector system shown at the left-hand end of stationary, while the roll 2 rotates with respect thereto. The collar 11 is secured to the neck of the roll 2 by means of studs 12. This collar 11 forms a continuation of the passage 6 between the outer concentric pipe 7 and the roll core 5. This passage is in communication with circular manifold 9 and, therefore, fluid injected into circular manifold 9 from supply pipe S will flow through the passage between the outer concentric pipe 7 and the roll core 5 into the central part of the roll., where it is conducted through radial passages 13 located close to the center of the roll.

Referring now to Figure 2, it will be seen that there are two sets of radial passages 13 disposed at 180 with respect to one another. Each set of radial passages 13 communicates with a horizontal inlet manifold 14 located provided with apertures 16 communicating with the an- Vnular channels 4. It will be seen that the horizontal.

Patented May 21, 1957 g in the preferred em-` Referringr now to Figure 4, it will be seen -that asvthefluid enters the annular channels 4 from the horizontal;

inlet manifold14 it can'flow around the annular channel 4l in either direction until theA two streams meetatl a point approximately 180 with respect to the point of entrance. At this point there is an,aperture.,17 leading` from the annular channel 4to adischargefmanifold 18.

The arrangement of dischargemanifolds is the same as.

the arrangement of theV inlet manifoldslexcept that-they. are angularly displaced from onel another -a slight amount on the circumference of the roll.

Referring nowto Figure vl, there'fis shownthe system fof wexhausting. or dischargingthe temperature control.v

fluid from the annular channels 4. This system comprisesa system of exhaust manifoldslsealed. from :the annular channels 4 by shield 19provided` with apertures `17; It will be seen that the fluid is discharged through aperture 17 fromV the first annular channel 4 into Vexhaust.manifold-18 positioned Valong the top of the roll, andthe second. annular channel dischargesinto exhaust manifoldfluat the' bottom-.of .the roll. Eachv-of-these exhaust manifolds ,1S

is divided into three compartments by means ofdams.

extreme left end ofthe injector'lltl, where it discharges into arradial manifold 24, which in turn discharges -intopipe 25, the llow through which is controlled by means of valve 26. The fluid from the four'annular channelsv'at the left'end of the roll isrdischargcd into compartments 20 at the left end of the roll through radial passages 27 into the intermediate concentric pipe 28, which discharges f into radial manifold 29\in the injector system 10. Radial manifold 29 discharges through pipe 3l) and the flow isN controlled by valve 31,

The two large compartments 21 taking the exhaust fluid Each of these sets of compartments is from the remaining channels in the roll Aconlrnunicateto the outer concentric pipe 32 through radial passages 33 leading from each compartment 2l. The fluid from the outer concentric pipe 32 leads to radial manifold 34 which Y discharges through pipe 35 controlled by valve 36.y It will.

be understood that each pipe in the concentric system is, sealed from the other systems so that fluid cannot lead from one to the other. This is accomplished by the, packg ing glands 37, 38, 39, and 40,1ocated adjacent each manifold. The radial discharge passages 22, 27, and 33 are in the form of threaded pipe which is threaded throughthe core 2 into a threaded nipple on the pipe to which they areconnected to prevent leakage at the point wherethe v pipe system and core abut. A

In the operation of the device, temperature control fluid of the proper temperature is conductedinto the roll'j through pipe 8. The rate of flow is controlled by valve 41.

channels 4 positioned lbetween.the corel5 vand *thevshpellh 3 ofthe roll. If it is found thatthe endslof tlltlollare,V

too cold) by lreason of the temperature control fluiclnvre.-V

moving .f0.9 muchllee .from that ma, the. ernanntof;.'y

uid leaving the end channels canbe controlled by means Von the left-hand end of therroll.

of valves 26 and 31, valve 26 controlling the flow of fluid from the four channels at the right end of the roll andv valve 31 controlling the flow of fluid from the channels at the lefthand end of the roll. With this system, it is possible to accurately control the temperature, inasmuch as flow can be completely stopped in the channels or impeded to any extent necessary.

Should it be found desirable to run fluid through different zones of the roll at different temperatures, this can.

be accomplished by utilizing the'modication illustrated in Figures 5 and 6, in which it will be noted that the concentric pipes are arranged in a different manner. Also in thisembodiment both the. inlet manifolds and the-'exhaust manifolds are divided into compartments by means of dams. Referring to Figure 5; it will be seen that the inner pipe 42 extends the full length of the roll cavity and is connected to compartments 2t) at each end of the roll by means of radial passages; 22,. at the right-.hand-.endcof the, roll and radial passagesZY. at the left-hand'endf'of the roll. Central pipe 42.in.this modificationisaconnected to the end manifold 24 thesarne ascentral pipe 23. is connected thereto in the other. embodimentearlier described.

Referring now to Figure 6, it. will be seen that the intermediate concentric pipe 43 communicates with theY end manifold compartments 44 through'radial passages 45 on the right-hand end of the roll and radial passages 46 This intermediate pipe is in communication with radial manifold 29 in the same manner as earlier described. With this arrangement, temperature control fluid can be introduced into the end channels of the roll from supply pipe 3f?, emptying into radial manifold 29, from which the` fluid is conducted through intermediate pipe 43, radial passages 45'and 46, tothe end compartments 44 in theinlet manifold 14. After the fluid has made one pass through the annular channels 4, it empties into end compartments 20.0f the exhaust manifold, flows through radial passages 22 and 27 into-the inner concentric pipe42, which' carries it to radial manifold 24 from which it is discharged through pipe 25. The radial flow of supply and the exhaust can both be controlled by means of valves 26 and 31. Should it be found desirable for some reason, the temperature control fluid canbe conducted into the roll through pipe 25 and inner pipe 42 and exhausted through the intermediate pipe 443 into radial manifold 29. The remainder ofthe rollcan, if desired, be controlled -by temperature f control fluid `of va different temperature, entering the roll f from pipe 35 into circular manifold 34, which communicates with outer concentric pipe 47. The fluid entering the i roll in outer pipe 47 is forced through radial passages 48l into the manifold compartment 49. After it has passed through the annular channels, it is discharged throughv radial passages 33,4 which in this embodiment lead into the passage 6 between the roll core and the outer pipe 47. The fluidis conducted through passage 6 to radial manifold` 9, which discharges the fluid into pipe 8. VIn this arrangement, the control of fluid entering and leaving the roll may be controlled by valves 36 and 41. Should it be found desirable, the direction of flow may be reversed and the fluid may be supplied to the roll through Vthe outer passagem and discharged through the outer pipe 47. With this embodiment, it ispossible to regulate the temperaturel at the ends ofthe, rollby introducing temperature control fluid at a higher temperature or decreasing the volume of iludor by adjusting both the temperature and the volume.

Shouldit be found` desirable to vary the number of annular-channels at the end of Yeach roll through which fluid vvof a higher, temperature isconducted or in which fluid is entrapped, this can be accomplished by increasing Ordecreasinsthe Size ,ofthe end nrrarifgldv compartments 2Qand 44. It has, been foundthat anhadjustabledam Stlicanbe lused, toaccomplish th'slpurpose, In' the embgdlment.illustratedin the. Figures, .1,10 6.the end wmf4 partxnents supply fluid Vto four annular channels; however,"

The head of the screw is accessible by removing the plug 52 in the end of the roll. It will be understood, of course, that Figure 7 shows only one dam and one compartment 44; however, it will be understood that all dams controlling the size of each end compartment would be similarly equipped.

It will be seen that this invention provides a system which is fairly iiexible in that the volume of temperature control tluid which flows through different zones in the roll can be accurately controlled by valves located exteriorly oit" the roll, or uid of a diiierent temperature can be directed to different zones to control the surface temperature of the roll.

l claim:

1. In a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control fluid circulating system disposed therebetween for controlling the temperature of the roll surface, means for dividing the temperature control fluid circulating system into zones along the length of the roll, said inner core being provided with a longitudinal central cavity, means for supplying temperature control fluid into said central cavity and means for discharging temperature control uid from said central cavity, means connecting said supply means and said discharge means with the individual zones of the temperature control fluid circulating system, and separate control means to control the volume of liuid flowing through one zone separately from the` fluid flowing through an adjacent zone.

2. In a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control luid circulating system disposed therebetween for circulating temperature control tluid to control the temperature of the roll surface, means for dividing the temperature control uid circulating system into a plurality of zones along the length of the roll, a separate supply system for supplying temperature control uid to the end Zones in the roll, a separate discharge system for discharging temperature control fluid from the end zones, a separate means for conducting temperature control iluid to the remainder of the circulating system, and a discharge means for discharging the temperature control fluid from the remainder of the system.

3. In a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control iiuid circulating system disposed therebetween for circulating fluid to control the temperature of the roll surface, means for dividing the temperature control fluid circulating system into zones, means for adjusting the size of said zones, and means for conducting heat transfer uid to said zones and exhausting heat transfer fluid from said zones.

4. In a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control uid circulating system disposed therebetween for circulating temperature control uid to control the temperature of the roll surface, means for dividing the temperature control huid circulating system into zones along the length of the roll, means for conducting temperature control Huid into all of said zones, means for discharging temperature control fluid from the individual zones, and adjusting means located externally of the roll to vary the volume ot temperature control liuid directed through one zone from that directed through other zones.

5. ln a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control liuid circulating system disposed therebetween for controlling the temperature of the roll surface, means for dividing the temperature controltluid circulating system into Zones along the length of the roll, said inner core being provided with a longitudinal central cavity, means for supplying temperature control uid into said central cavity and means for discharging temperature control uid from said central cavity, means connecting said supply means and said discharge means with the individual zones of the temperature control fluid circulating system, and separate control means located externally of the roll for varying the volume of the temperature control iiluid circulating through one zone from that owing through the adjacent zone.

6. In a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control luid circulating system disposed therebetween for controlling the temperature of the roll surface, means dividing the temperature control fluid circulating system into Zones along the length of the roll, said inner core being provided with a longitudinal central cavity, means for supplying temperature control uid into said central cavity and means for discharging temperature control iluid from said central cavity, means connecting said supply means and said discharge means With the individual zones of the temperature control fluid circulating system, and means located externally of the roll for separately controlling the temperature control uid supplied to each zone.

7. ln a heat exchange roll of the shell type, comprising an outer shell and an inner core with a temperature control iiuid circulating system disposed therebetween .for controlling the temperature of the roll surface, means for dividing the temperature control fluid circulating system into zones along the length of the roll, said inner core being provided with a longitudinal central cavity, means for supplying temperature control uid into said central cavity and means for discharging temperature control fluid from said central cavity, means connecting said supply means and said discharge means with the individual zones of the temperature control fluid circulating system, and separate means located externally of the roll for separately controlling the temperature control uid discharged from each of said zones.

References Cited in the tile of this patent UNITED STATES PATENTS 1,536,832 Evans May 5, 1925 1,928,173 Gerstenberg Sept. 26, 1933 2,498,662 Eaby Feb. 28, 1950 2,603,457 Bishop July 15, 1952 FOREIGN PATENTS 253,331 Switzerland Nov. 16, 1948

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