US2341335A - Heating system for composite paperboard machines - Google Patents

Description

Feb. 8, 1944. N. M. SIMMONS HEATING SYSTEM FOR COMPOSITE PAPER BOARD MACHINES Filed March 28, 1940 I5 Sheets-Sheet l lld .THT

E YS.

Feb. 8, 1944. N. M. SIMMONS 2,341,335

HEATING SYSTEM FOR COMPOSITE PAPER BOARD MACHINES Filed March 28, 1940 3 Sheets-Sheet 2 I N VENTOR Feb. 8, 1944. N. M. SIMMONS HEATING SYSTEM FOR COMPOSITE PAPER BOARD MACHINES Filed March 28. 1940 3 Sheets-Sheet 3 .B FIET'LD PIE hrz-151% Patented Feb. 8, 1944 UNITED STATES PATENT OFFICE HEATING SYSTEM 'FOR COMPOSITE PAPER- BOARD MACHINES l Claims.

This invention relates to a steam heating and showering system i'or corrugating machines.

In the manufacture of corrugated board two or more plies are utilized. One ply is always iluted and secured adhesively to another ply, called the liner. This is single face board. Ii the corrugated or uted ply is between two plies or liners, it is double face board.

To flute the corrugated ply. since the paper sheet stock is brittle, it is customary to meisten the same before forming the ply into corrugated form. The corrugated or uted sheet is dried to expel excess moisture and usually while supported on a roll which has a surface complementary to the ilute arrangement in the ply. An adhesive is applied to high points or ridge and the liner is then applied thereto and held thereto. 'I'he previously roll seated flutes then have their ridges coated with adhesive and a second liner is applied thereto forming double face board.

Heat is then applied to dry and set the adhesive and further dry out the board. If single face board is fabricated. the second adhesive application and second liner is omitted. If the heat for drying be insuillcient the adhesive will not set up and when the board passes through the slitter, the knives thereof turn up the edges of the liner and this amount of "turned up stock is wasted. If the heat for drying be excessive, the board will have imparted thereto an initial warp diiiicult to remove and which may be suicient to prevent utilization commercially of said warped board.

From the foregoing, therefore, the importance of dryer (plate) control will be self evident and when proper drying is effected, there will be substantially no wastage or inferior (warped) board.

There should be for proper board maufacture, a definite correlation between showering (tempering) and paper speed. Paper speed is determinable by machine speed, and that in turn is determinable by curing (drying).

Present practice in board production is to observe the iinished board as produced and vary the speed of production and amount of showering to obtain as near perfect board as possible.

The present invention is directed to a control such that for varying machine speeds, the curing is correspondingly and automatically varied. For varying machine speeds, showering (tempering) must be varied. This is a function of both time and amount of moisture applied to the sheet to be tempered.

The present invention by reason of its control, et cetera, permits the machine to operate at maximum eiiiciency at all times and at full capacity.

The present invention has the further advantage that instead of requiring about four hours to bring such a machine up to proper operating condition, such condition can be attained in about one hour, thereby making available about three hours of production, not otherwise available.

'I'he chief object of the invention, therefore, is to provide a corrugating machine with a. system for heating and showering but more particularly the former, whereby the several advantages previously mentioned are obtainable.

The chief features of the invention consist in elimination of trapped air and condensate by rapidly circulating the heating medium (steam), automatically controlling the curing in relation to machine speed and by sequentially connecting the corrugating and curing heating systems, as well as preventing an undue amount of live steam entering the main return line.

Other objects and features of the invention will be set forth more fully hereinafter, such as the ejector type of roll and drum discharge, the speed responsive control device, the bypass arrangement, or arrangements. heating plate connections, trapping arrangements, the thermometers and mountings therefor, the roll and drum steam supply constructions and the individual control valves.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims:

In the drawings,

Fig. 1 is a piping diagram in conventional elevation of a corrugating machine to which the inv ention has been applied.

Fig. 2' is a top plan view of the heating plates and the piping connected thereto in conventional piping diagram. In Figs. l and 2 intermediate portions of the plates or curing mechanism have been broken away or omitted to reduce the showing.

Fig. 3 is an enlarged sectional view through the ejector type discharge of the several rolls and drums to the initial return line.

Fig. 4 is a view similar to Fig. l and ci' a modified form of the invention.

Fig. 5 is an enlargedd longitudinal sectional view of the ejector discharge initial return line construction embodied in the modification shown in Fig. 4.

Fig. 6 is a. longitudinal, sectional view through one form of preheating drum.

Fig. 7 is an enlarged, longitudinal. sectional visw through one form of corrugating or pressure ro 2 ascissa Fig. 8 is a shnilar view oi' a modined form oi' roll or drum.

Fig. 9 is a sectional view through a trap satisfactory for inclusion in the system.

Fig. l!) is an elevational view looking at a diamond port valve suitable for inclusion in the system.

Fig. 11 is a plan view thereof.

Fig. 12 is a central sectional view through a temperature gauge or thermometer and the method of mounting the same, which has been found satisfactory in the system.

Fig. 13 is a front elevation thereof.

Fig. 14 is an enlarged, central sectional view of the speed responsive control valve.

In Fig. l, the numeral 20 indicates a main supply line from the boiler o! a suitable capacity sumcient to supply steam at the desired temperature and pressure and in the desired amount. The numeral 2| is the main control valve to the machine heating and showering system. It preferably is of diamond port character with a lever handle of indicating type and the valve is of the lubricated, throttling type adapted to handle pressures up to 150 lbs. per square inch.

A line 22 is connected to this line 2l by a suitable T-connection and included in said line 22 is a similar valve 23. Also included in said line I! is an auxiliary main control valve which is of the wide open and cutoff type. the same being indicated by the numeral 24. A branch from said line and indicated by 26 is controlled by a valve 2i similar to the valve 23' and it includes a pressure gauge 21 which is capable of indicating temperatures up to 450' F. The line 22 controlled by valve 23 leads directly to the shower indicated conventionally by the numeral 2l. A similar set of shower connections is illustrated and the parte thereof are indicated by similar numerals with the subscript a.

It will be apparent that when it is desired to operate the showers that the valves ll-Ma are opened wide and that the valves lI-a are each adjusted so that only the desired amount o1' steam may pass into the showers and the temperature ol' that steam may be visually determined by the thermometers.V

In machine operation whenever it is desired to shut down the machine, the motive power is disconnected and the main valve 2l is closed. If, however, it is desired merely to shut down the showers for some reason or other, the gate-valves 2li-24a only are closed without disturbing the valve adjustment on valves -a. With the gate-valve wide open. should the condition of the paper require additional or less tempering. the valves 23 and/or 23a are then adjusted as required and this position by means oi.' the indieating handle, to which reference will be had more fully hereinafter. is indicated by a mark the operator places on the valve so that in the event it becomes necessary to shut olf the throttling valves 23 and 23a, they may be readily closed and their normal open position, asrequired, may be readily reestablished by moving the handle to the operator-indicated position. This reduces the non-productive time of the machine when bringing it into operative condition.

The discharge of steam from the shower mechanism in the showers is of conventional character and there is no return since themoisture is applied to the paper sheet passing through the showers and is absorbed thereby, this constituting tempering as is well known in the industry, and since there is a continuous ow of steam,

there il little or no air trapping and little or no condensate formed in the shower supply.

The supply line 20 is provided with a thermometer 2l of the character previously described, and more fully set forth hereinafter and also a pressure gauge structure 3l which is controlled by a valve "b, similar to valves 2i and 23. This gauge is adapted to indicate pressure up to 209 ibs. per square inch.

An auxiliary supply line 3l is controlled by a diamond port valve 32 and leads to an upper preheating drum 34. The discharge therefrom is indicated by line 3l and itis controlled by a valve 3l and included in said line is a thermometer arrangement 31 of immersion indicating dial type, and to which reference will be had more fully hereinafter. There are two upper preheating drums illustrated and numerals similar to those previously employed with the subscript a indicate the steam circuit for the second drum.

Included in the line, and near the bottom, there is a waste connection 38 controlled by a valve Ila. This discharges to any suitable waste arrangement. The line 20 includes a plurality o! Ts, to the branch portions of which are connected supply lines. one branch line 39 includes a valve Il similar to the previously described diamond port valves and discharges to a lower preheating drum Il, the discharge therefrom being indicated by the numeral 42, including cutoff valve and said discharge line l2 includes the thermometer 4I.

Another branch supply line from line 2l is indicated by the numeral I5 and includes a control valve ll that discharges to the pressure roll I1. The discharge Il therefrom includes the valve 4l and the thermometer It.

Another branch supply line 5I from the main supply 2l is controlled by the throttle valve i2 and discharges to a lower corrugating roll il and the waste line 5l therefrom includes a thermometer Il and the shutoif valve 58.

Another branch supply line 51 includes the control valve Il and said line discharges to the uwer corrugating roll I9 and the waste line 80 therefrom includes a thermometer 6| and also includes a control valve i2. Between the shower and upper preheating roll supplies and the lower preheating drum pressure roll and corrugating mils supplies, there may be interposed valve i3, see lower right hand portion of Fig. l.

An initial line Il is illustrated more clearly in Pig. 3. Each oi' the several branch discharging lines Il, ila, n. I5, Il and Il, finally discharge into the line BI, as shown in the lower right hand corner of Fig. l and more particularly in Fig. 3. Herein each of said discharge lines terminates in an elector tube having the downstream directed tip, the same being indicated by the same numeral as the initial return line with which it is in communication but with the subscript b. It will be observed-see Fig. 3-that no ejector tip is masked by any adjacent tip. The arrows indicate the several directions of how. While herein these tips are shown positioned in a common, longitudinal plane and are progressively staggered with relation to each other from one side to the opposite side of conduit 64, these elector tips may be positioned so that they are spiralled, as it were, in position and attain the same eilect. which is prevention of blanking of the discharge at each ejector tip.

It will be noted that the individual discharge lines previously described, all discharge downwardly and due to the elector action on the tips thereof, there is a deiinite suction action produced in each discharge line 3l, lief, IB, il and B0, which servesto insure the proper rapidity oi steam flow through each of the rolls, drums and the like. which suction serves to carry with it air normally pocketed therein or water condensate collected therein. Thus, each oi' the branch supplied devices is subjected to live steam throughout its individual heating arrangement so that the theoretical maximum heating action always will be obtained therefrom when desired unless throttled down.

The present practice is such that these several individual heating devices comprise arrangements that normally have a portion that "air pockets or in which water condensate collects and, therefore, these areas, in which the aforesaid results, are very much colder than the other portions oi' the device, with the result that non-uniiorm heating of the paper, to which these devices are subjected, results. The present invention, therefore, insures the desired and contemplated efficiency and uniform heating of the paper from these several devices.

In Fig. l of the drawings, the numeral B6 indicates a preheating drum of the double hacker of the corrugating machine. The numeral Bl indicates the top roll of the double hacker. The numeral 61 indicates the lower roll or the double hacker. A line 68 takes off from line 2i! and is controlled by valve 68 and discharges to drum 65. The discharge therefrom, indicated by line 10, discharges to the lower end of a trap 1l, having a waste 1|a controlled by a waste valve 1lb. Air and condensation passes through the trap construction, hereinafter to be more fully described, and discharges by the line 12, controlled by a valve 13, to a return line 14.

A supply line from the main 20 .is controlled by valve 1B and discharges to the upper roll IB of the double hacker and the line 11 therefrom discharges to the lower end of the trap 1l having the waste line 18a controlled by the valve 18h. Line 19 from said trap 18 is controlled by the valve 80 and discharges air and condensation to the return line 14 before mentioned. Double hacker devices are usually operated at much lower pressures and temperatures than that of the prior described devices shown in the right hand portion of Fig. 1, hence, the return from the double backer devices is not utilized for plate heating.

In like manner, a line 8| controlled by a valve 82 supplies steam from the main supply 20 to the lower roll 61 of the double backer and the discharge 83 therefrom discharges to the lower end of a trap 84 having a discharge line 84a controlled by an outlet valve 84h and this trap discharges air and condensation by line I5 to the auxiliary return 16, such discharge being controlled by the valve B6.

In addition to the valves mentioned, in connection with the traps 1I, 18 and 84, each is provided with an inlet valve similarly numbered, but designated by the subscript c. The numeral I1 indicates a main return and it will be noted that line N, to which all of the aforesaid traps discharge, is connected thereto at 81a.

The main supply line 2li at its end discharges by line B8 to the lower end oi a trap B9 having the waste line 89a controlled by valve 89h. The inlet to said trap is controlled by valve 88e. This trap discharges by the line 80 controlled by valve 90a to the main return line 81 at 81h. The line Il. which is the initial return line, discharges as at Gla to a trap 9|, the intake thereto being con- Jill trolled by valve llc, the waste therefrom being indicated at lia and the latter being controlled by valve lib. This trap discharges by line l2 controlled by the valve lla to the main return l1, as indicated at llc. Observe that all traps heretoi'ore mentioned have individually controlled waste lines and also discharge to main line 81.

It will be apparent. therefore, that these traps, previously described. remove the air and water from the various steam lines and thus there is no condensate binding and the steam may freely flow through the system to the trap and the condensation and air are discharged into the main return. The trap Il is a high pressure steam trap and the trap Il is of like character, and the same also applies to the traps 1I, 'IB and 8|. Lines 1I, 11 and Il are all copper pipe, bent to fit the control valve and thermometer return connection from the respective unit being heated and discharge to the respective designated trap.

Reference now will be had to the middle portion oi' Fig. 1. The main discharge or initial return line Il communicates with a branch il! which connects to the intake side of a reverse acting steam supply governor structure, indicated generally by the number 84, and including the centrifugally operable weights 95 and the outlet 96. This centrlfugally operable valve may be suitably connected so as to be operable in synchronism with and by the machine. At least, it is responsive to machine operation and herein said structure is shown as being belt driven, see Fig. 4, and, it may be added, with the power take oi driving from the double backerdrive.

This governor is so arranged that its valve opens automatically as the speed o! the machine increases, and this supplies additional steam to the line 91 controlled by the governor valve. When the speed oi' the machine decreases, the governor valve is correspondingly operated to re duce the steam supply. This steam supply is utilined for the heating or curing portion of the corrugating machine and thus predetermined curing action always is obtained regardless of the speed of the machine, the heat supply being automatlcally varied by the governor control. Whenever the governor valve automatic action is cut out the curing action is not always constant, that is in the amount required for proper curing and Wai-page results.

Reference will be had more fully hereinafter to the detailed construction of this speed governor valve illustrated in Fig. 14.

The line 98, from initial return line BI, joins 98a to the main supply $1 which supplies steam to the heating or curing mechanism. Valves 88a and 98h are interposed in the line Sii-93, including valve il and at opposite sides of said valve. A. line 99 has free connection to line 91 at one end andwonnccts to the main supply line 2li at the opposite end and includes the control valve 99a therein. Note that in Fig. l the governor weights are illustrated upon line il! making the latter appear discontinuous which, however, is not the case for line 99 also connects to line 81 (as line $6) at 98a.

A branch line IBD herein is shown connecting line B9 and line u and it is controlled by the valve llla. A pressure gauge IBI is connected by line |02 to this cross connection and is controlled by the valve |020. Thus, line 8l constitutes a high pressure bypass around the governor valve controlled by valve 08a, while line IMI. controlled by valve indo, constitutes a lower pressure bypass around the governor valve, these two bypasses 4 assises being in multiple with each other. The purpose of said bypasses is to insure an adequate amount ol steam for the curing mechanism.

With this arrangement. therefore. the desired major portion oi' the steam supply required lor curing may be supplied without control and the variable amount essential for control then may be supplied through the governor arrangement connections. The amount of steam so supplied by the bypasses may be regulated so that the aforesaid condition results. Ii' desired. the majority. or maior portion, of the steam supply may be governor controlled and only a minor portion may be oi xed supply type supplied by either or both oi the bypass arrangements.

Considerable ilexibility is therefore possible together with very close regulation during operation. the major control heini! ol manual character and the close control being o! automatic character to thereby insure perfect curing.

inasmuch as the lower pressure line constitutes, as it were, the discharge from the various drums and rolls as illustrated, there is insured a continuous now o! discharge from said last mentioned elements, since the steam therefrom is required for curing mechanism heating. Should )perating conditions be such that an insuihcient amount oi low pressure supply be available, this may be supplemented by high pressure steam through the high pressure bypass arrangement so that ii the mechanism ahead oi the curing mechanism requires a supply such that there is insumcient heating capacity available in the discharge from the mechanism ahead for curing mechanism heating. this may be made up by the high pressure supply. The certainty and ilexibility of control and supply and especially the automatic coordination oi' the same to machine operation will be readily apparent from thebriei description heretofore set forth regarding the speed control valve connections and the bypass arrangements.

'Ihe plates can be heated and desired temperature maintained on plates or any group oi' plates by admitting steam through either of the bypasses when the machine is not in operation. This eliminates any lag in production, for the plates can be initially heated independently of machine operation and while the before mentioned devices also are being heated up for operation. Thus plates and devices can be simultaneously brought to operating temperature even though the machine, while operating insofar as curing is concerned,A is automatically controlled rsponsive to machine speed.

This speed control is the automatic variable. The manual variables are introduced by valves 95a and Illia by the operator noting the character of the paper sheets used. their moisture content. and the caliper of the board then supplied to the plates. Minor control variations required are automatically applied. Major control variations naturally are manually applied and the former is continuous in machine operation, while the latter is infrequent, for example, as when a change over in board caliper is desired. or when a new paper roll is applied to the corrugator.

Reference now will be had more particularly to the left hand portion of Fig. l and Fig. 2, and therein is illustrated conventionally the curing mechanism in the form of a plurality ot successively arranged heating plates over which the completed board passes to the discharge and slitting end oi the corrugating machine. Any suitable number oi heating plate structures may be employed, and herein the curing mechanism is illustrated asoi the type where the board passes thereover. It may be ot the type wherein the board therebetween and that is, the plates may be positioned above and below the board or whenever desired. in the latter arrangement. either the upper plates or the lower plates may be cut oil.

The invention also applies not only to the aforesaid, but to a curing mechanism wherein the plates are positioned solely above the board. It will be remembered trom the previous description that line 8l constitutes the main return and that line 91 constitutes the steam supply to the curing mechanism, line el being selectively and automatically supplied by line I3. Il, Il and Ill as aforesaid.

In the left hand portion oi' Fig. l. there is illustrated a plurality of identical plate structures. indicated by the numeral III. Herein these several plate structures are grouped together in fours. the ilrst group being shown in full, the second group being indicated merely by a portion of the rst plate thereof, the last group being fully illustrated and the last plate of the second last group being partly illustrated. Thus. the partial illustration oi' the ilrst unit oi' the second group and the partial illustration of the last unit of the second last group may be illustrations of the end units of the same group or of dierent groups and these diilerent groups may be oi' adjacent character or these two groups may be separated by one or more intervening groups, depending upon the number of plates embodied in the curing mechanism.

In corrugating machines, it is customary at the present time, to provide somewhere ln the neighborhood oi' twenty heating plates which, by reason of the present connections, would lbe arranged in nve groups. The standard connections for these plates is to connect the inlets of all the plates to a common supply line and usually a high pressure main and all the discharges connect to a common return line. The foregoing is conventional practice.

The result of such connections is that. as steam is supplied to the several plates to be utilised for curing purposes, and all may not he utilized. the air trapped therein air-binds the plate and the steam condensed therein water-binds the plate, so that it has been actually determined that with the standard connections to these heating plates, the opposite ends of the plates may be at diilerent temperatures and some dliler very markedly towit, as much as 1". Some plates are at a high temperature and others, due to the binding of either character. may be at a very low temperature.

The present invention. by connecting these plates in series, insofar as grouping is concerned, insures rapid and positive circulation of the steam, eliminating condensation or water-binding and eliminating air pocketing or air-binding. With this invention applied to these standard plates. a high degree oi regulation and control insofar as curing is concerned, may be obtained therefrom. Poor curing operation usually is compensated for by slowing down the machine. With the present invention, this condition does not occur so that the machine may run at maximum capacity. In standard practice. if the machine be run at the maximum capacity. there usually results undercuring, with the results as stated in the forepart oi' this description.

As conditions vary, it will be quite evident from the following description that the curing action of the plates can be easily controlled and regulated to effect proper curing under maximum production. The several plates which are to be connected in series are joined together, that is, the discharge from one is connected to the intake of the other and by means of soft copper piping oil expansion loop formation and indicated by the numeral |00.

The intake line or supply line to the first plate of the group is indicated by the numeral |00. It is controlled by the valve adjacent its connection to the supply line 01. The discharge from the last series connected plate of the group is indicated by the numeral |01 and included in said line |01 is the thermometer |00. The other end of said line discharges to the lower end of a high pressure trap |09, the latter having a control valve H0 ahead of the same and controlling the supply thereto. The waste line I I therefrom is controlled by the cutoff valve Illa. The discharge H2 from the trap |00 is controlled by a valve I|3 and the line il! discharges at illu to the main return line 01. The units of cach group are similarly and individually connected and the groups are similarly connected to supply iine 91 and main return line 81 as shown in Fig. l.

The end of the supply line 01 is connected by a line ||4 to the lower end of a trap lil and this connection is controlled by valve Illa as well as valve Ilia. The waste line IIB from the trap is controlled by -valve IIBa. The discharge line ||1 from said trap is connected to the main return line 01. Thus, accumulation of condensate in the several supply lines and at the ends thereof, which would result in waterbinding or air-binding, at the ends is eliminated so' that all units receive steam in proper condition.

It is also to be observed that each of the traps has its discharge line connected to the common return line or header through a. Y-connectlon, the direction of the discharge to the header being in the direction of the flow of the steam in that header or toward the boiler plant, thus facilitating the discharge to the return and insuring rapidity of circulation of the steam through the machine.

While herein the plates are shown grouped in fours, any other grouping may be employed that is satisfactory. It has been determined, however. that four is a. convenient number and each unit of four is able to obtain, without excessive size of conduit, proper steam supply for proper heating or curing purposes. A lesser number merely results in the requirement, for example, that the steam supply be throttled down excessively and that a larger number of valves and traps and Y-ttings, et cetera, must be employed without any additional advantage being obtained from utilizing this modification.

It is often highly desirable to clean the machine and various valve controlled hose outlets are provided. One oi the same is indicated at ||9 and the valve controlling same is indicated at Ilila. It also will be apparent that the valve 38a controlling line 30, hereinbefore described, may in addition to being a waste connection, constitute a machine cleaning connection.

Reference now will be had to Fis. 4 which illustrates a modified form of the invention, and inasmuch as the curing mechanism in this form of the invention is substantially the same as that illustrated in Figs. l and 2 no plan view of the former is shown. In this form of the invention numerals similar to those previously employed but increased by 100 designate like or similar parts, it being noted that the numerals for the first form of the invention begin with 20 and end with H0, inclusive, and in this form of the invention. the numerals start with |20. Thus, the numeral |20 indicates the main supply line.

The numeral III indicates the main control valve and the line |20 is branched as at Illa, one branch |201: controlled by valve |20c being positioned overhead relative to the machine and the otherP branch |20d being downwardly directed and being capped at the lower end as indicated at |20e. This lower end is provided with a trap |09, the supply line |00 thereto including the control valve |00c and the waste |004 being controlled by valve |00b. The return from this trap, indicated by line |00. isy controlled by valve Illa and the line |00 discharges, in the present instance. to the return line |00 and by a Y- connection, for reasons previously assigned.

It will be noted that the numeral |00 indicates a small preheat drum, |50 the top corrugating roll, |53 the intermediate or middle corrugating roll. |01 the pressure roll, ill the preheat drum and |344 the larger preheat drum. The numeral |65 indicates the upper preheat drum on the double hacker, |60 the top roll thereof, and |01 the bottom or lower roll thereof. Each of these last mentioned rolls and drum is individually connected by upwardly directed risers to the auxiliary main steam supply |20b, as shown. and the discharges therefrom individually discharge to traps, each of which in turn have waste discharges and which traps also discharge to the return line |04 by Y-connections. Indicating thermometers and control valves of diamond port character are utilized in the various connections.

No specific mention will be made of the several connections other than to point out they are in multiple between the line |201: and the line |00 and numerals increased by |00 are applied to these several parts, the primary numerals of which have heretofore been employed and designate corresponding paris with reference to the form of the invention shown in Fig. l.

In corresponding manner, each of the piping arrangements to the several drums and rolls' other than those last described. take oif from the main supply line |20a and the several discharges therefrom connect to a discharge or return line |6411 which rises vertically and then passes overhead with reference to the machine. 'The lower end of this header IBla is capped as at |0412. The end of this line is provided with a. trap |0| which has its discharge connected to the line and is provided with a control valve Ilic, a waste or drain line |0|a controlled by the cutoff valve itib. The line |02 is the usual discharge from said trap |0| and is controlled by the valve |0241.

Each of the discharges from the last mentioned group of rolls and drums, as stated, discharges to the vertical riser lea, as shown in Fig. 4, and these several discharges are of iet character and constitute ejector functioning discharges, as shown clearly in Fig. 5, wherein the numerals oi each discharge with the subscript b designate the elector tip.

As shown in Fig. 5, these ejector tips are positioned in spaced relation relative to each other and longitudinally of the direction of flow, and they are so arranged that no tip is blank'ed by an adjacent tip or any other tip, and if desired, the arrangement shown in Fig. 3 may be employed or the tips may be arranged annularly or angularly spaced apart or in spiral relation. The

several roll and drum discharges therefor in the present embodiment of the invention, functionally are the same as thatdisclosed in Figs. 1 and 3, and the s action is obtained in the second embodiment as obtains in the structure disclosedin said Figs. l and 3.

In view of the detailed description relative to the embodiment illustrated in Figs. 1 to 3, inelusive, no further detailed description is believed n except to point out that insofar as the double hacker rolls and drums are concerned, and the corrugating and preheating rolls are concerned, steam supply thereto is downwardly in each instance and at right angles to the intake, and then the discharge therefrom is outwardly therefrom and downwardly, the latter portion being at right angles. This arrangement, it will be obvious, does differ from that shown in Fig. i, except insofar as the preheating drums Il and a are concerned, and to this extent the present form of the invention is similar to the form of the invention in connection with preheating drums Il and lla.

Line il! from the supply main Ina leads to the shower mechanism in this embodiment of the invention, and it will be noted that these showers are in multiple as were the showers previously described. except that in this form of the invention all the showers are connected to a singie supply line |22 in turn connected to the main supply whereas in the previous form of the invention, the showers were individually connected to said main. This form of the invention also illustrates the addition of a guide roll Il for the sheet to be showered and this derives its heat supply from the common connection to the showers, as shown, and then returns or discharges to the line lila and if desired, this discharge may be provided with a trap discharging to the line |34 and with the usual drain line control valves. Only the take-off from line |22 to roll Ill is illustrated. the aforementioned return being omitted in view of description given and comparable illustrations of other returns. By making connections in the same manner any condensation in steam supply |22 will pass on by steam outlets and shower down through the guide roll l to line iMa in turn maintaining a ready supply of dry steam at valved outlets and showers.

The supply line to the several heating plates of the curing mechanism is herein designated by the line l1 and the main return is designated by the line |81 and it will be noted that the line I discharges by a Y-connection to this line |81 at Illa. Since the system of connections for the curing plates is substantially that previously described with reference to Figs. 1 and 2, no further reference will be had thereto, but reference now will be had to the bypass arrangements, and speed governor valve control shown ln Fig. 4.

Referring to Fig. 4, it will be noted that line ill is the steam supply line to the curing plates and the line I is connected at one end thereto and at the opposite end to the auxiliary main or high pressure line illb. This is suitably valve controlled as at Ilia and lesb and interposed between said valves is a branch 2li! controlled by valve his and leading to a pressure gauge 2li. The line ind, which is the discharge line from the co'rnllratlnz and preheating rolls and drums.isconnectedbyline|l3toline|l1by way of the speed governor control valve l and the discharge ill therefrom is controlled by valve Illa. The supply thereto is controlled by valve lllb, as before mentioned. This line III may include a pressure gauge also designated by the numeral Illa, and the Supply thereto is suitably valve controlled by the valve 2Mb. A low pressure bypass n indicated by the numeral 200 and it is controlled by the valve Ilia.

It will be noted that as between the two modifications, that in the present form of the invention, there is included a supply to the curing plates which is derived from the discharge from the corrugating rolls and preheatins drums and this supply is controlled by the speed controlled throttle valve and that this low pressure supply is provided with a bypass arrangement. and also there is provided a high pressure bypass arrangement.

In the present form of the invention, it will be noted there is a pressure gauge included in the main low pressure supply and one in the high pressure bypass supply and none in the low pressure bypass arrangement whereas in the form shown in Fig. 1, there is no gauge shown in the low pressure supply or the high pressure supply but the gauge is shown in the low pressure supply bypass arrangement. It, of course. is evident that gauges may be includedin each of the three supply arrangements mentioned or in any one or any two thereof.

Since the curing plates derive steam from the line |81 and the main return is by way of line |81, no further description is believed n en: since in the present embodiment of the invention, see Fig. 4, the curing mechanism is shown substantially identical to that in Figs. l and 2 of the first form of the invention. wherein line 91 constitutes the supply and Il constitutes the main return.

Reference now will be had to several details oi' construction and these are set forth in the several figures beginning with Fig. 6.

In Fig. 6 of the drawings, there is illustrated in conventional, central section, a preheating drum and the cylindrical body portion thereof is indicated by the numeral I and one bearing is indicated by 30|. The opposite bearing is tubular and is indicated by the numeral 302. 'I'he drum is hollow or chambered, as indicated at ID3. Steam is supplied for heating purposes through the tubular channel 3M and thus enters the drum at the left hand end. as shown in Fig. 6. Within the drum is ya" hard, copper return tube, indicated by the numeral 3B! and its free and open end terminates adjacent the solid end or bearing such open end being indicated by the numeral l, The end portion is turned. as indicated at 301, so that the mouth 308 of this return line is close to the drum periphery and more particularly the low side of the drum. So that. the entering steam will discharge through the drum and force the air therefrom on initial heating and then the water condensation formed by reason of that heating and subsequent maintenance of the heated oondition of the drum also will discharge through this line lili. It is to be understood the fixture lill is stationary and thus steam. supply and the steam return as well as the venting or return tube are stationary while the drum is rotatably mounted.

In Fig. 7 there is similarly illustrated in conventional manner, a supply and return arrangement for the corrugating and pressure rolls.

assises l'i this form oi' the invention it will be noted that the numeral 400 indicates corrugating and/or pressure roll body portion including the chamber 400 and having a tubular end 40| which is closed as at 40|a. This tubular end 40| is chambered as at 400s and a support member 400 is included therein. The opposite end o! the drum includes the tubular bearing portion 402 which provides a steam supply space or passage 404 and extending therethrough and into the chamber is the return line 400. The steam supply and return line are suitably associated together as at 401.

Herein the return line 400 includes an oilset portion 400s and near the remote end thereof is the intake portion 400. The :l'ree end oi' this pipe is capped as at 400a and the retainer element 400 is included upon the pipe opposite the cap, the support for the pipe being the apertured partition 400. The structure 401 and pipe 405 are stationary.

In Fig. 8 there ls illustrated a mcdled form of the invention and this form may be utilized for any of the preheating rolls and drums just as either of the two preceding forms may be utilized in any of the preheating rolls and drums. In this form of the invention the numeral 500 indicates the roll or drum, 503 the chamber therein, 50i one bearing, 502 the opposite bearing. There is a recess arrangement in bearing and the same is indicated at 503e. Herein a relatively large tube is positioned therein and is indicated by the numeral |0. It has four discharging openings 0H near end 50| and the end of this tube 5|0 is capped as at 5080. which serves as a support for that tube within the recess 603. The end of the tubular bearing 50i is closed as indicated at 60|a. The numeral 501 indicates a fixture similar to that previously designated and 501s indicates the steam inlet and 501b indicates the steam outlet. The tube 5I0 has free communication with inlet 501m and thus steam is supplied in the present instances at the remote end of the drum or roll, with reierence to the connection arrangements. Since it is supplied at the remote end, the return is positioned at the adjacent end of the roll or drum and herein the same includes a smaller copper return tube 505 bent as at 506s and terminating in the inlet opening 50B adjacent the drum periphery and this extends downwardly so it terminates near the bottom of the drum.

In Fig. 9 there is illustrated a conventional type of trap and herein the numeral 600 indicates the body portion with the inlet opening sul at thev bottom. A cap structure 602 closes the top of the trap chamber. It includes in independent chamber 600, access to which is had by means of a plug B04 it desired, and a trap outlet opening 005. An opening 606 in the cap structure 002 provides a communication between chamber 000 and chamber 000e in the body portion 000. Mounted in chamber B00 is a bucket arrangement 001 and the same is connected to a valve arrangement 008 which controls the passage B00 in the conventional manner.

Figs. l0 and ll illustrate a conventional diamond port valve and herein the body portion is indicated by the numeral 100 and the same includes inlet and outlet openings tapped for conduit reception and indicated by the numeral 10|. The valve member is indicated generally by the numeral 102 and includes a diamond port 100 therein. The valve member 102 includes an externally exposed stem portion `|04 which mounts an indicating collar with a pointer 100 adapted to indicate valve positioning with reference to a scale 101 carried by the body portion oi the valve.

The operating mechanism includes a handle 100 associated with the squared portion o! the stem 104. A screw bolt |00 carried by the valve stem is a means for forcing lubricant contained in the valve body outwardly so that the valve is continuously lubricated until the bolt member has fully advanced into valve stem, whereupon lt is removed, the valve stem lubricating chamber repacked and the lubricating pressure applying bolt repositioned. The valve body closes one end o'! the valve and a plug 1 I0 closes the opposite end thereof. The valve body is normally retained in seated relation by a spring. not s Figs. 2 and 13 illustrate the thermometer or temperature gauge and its method of mounting. In said figures, the numeral 000 indicates a conduit including a cross connection 00|. The gauge body portion 002 includes a threaded portion 000 which is threaded into one of the two transverse threaded portions of the cross ntting. The opposite opening of the cross ttlng receives a nipple 004 of the desired length and this is closed by a cap 005.

Projecting axially into this capped nipple arrangement and irom the portion 000 is the thermally responsive structure 000 which has an indicating element Ill thereon. The chamber B01 is formed by the transparent closure 000 and the retaining member 009. The dial member 0I0 is carried by the body portion 802 in the chamber 001, Thus, the temperature of the steam in the conduit 000 is visually indicated at all times.

Reference now will be had to Fig. 14. In this ligure there is illustrated a valve body portion 900 and the inlet opening is indicated at 00| and the outlet opening at 002. Complementary connections for connecting piping thereto are indicated by the members 000 and the rings 904. This body portion includes a partition arrangement 005 which has two openings 906 in axial alignment and the same receives a valve member 901. The two openings 00B are in alignment and the valve body includes an opening 908 in alignment therewith closed by a plug 909. This valve body 800, opposite the plug 909 and the aligned openings BOB, includes an opening 9|0 deilned by anchoring flange 0| i.

There is suitably carried by this flange 9H another flange SI2 and the arms 0I3 therefrom suitably support a lateral bearing arrangement 9M and mounted therein is a shaft that at one end mounts a bevel gear 0|! and at the opposite end a pulley SIS. This pulley is belt driven from some part of the machine, usually the double becker mechanism, and, therefore, this gear is driven at a speed proportionate to the machine speed.

Meshing with the gear lil is another gear SI1 and a. collar SIB connected therewith includes elongated flexible members BIB with counterweights 920, the members being connected together as at 02|. As these members rotate, the collar portions 0I0 and 02| have movement toward and away from each other and thus the central portion 022 has axial movement with reference to the axis of the gear 011. This structure 922 is suitably connected as at 023 to the valve 001. Thus, as the speed of the machine varies. the valve position is varied. The raster the machine operates. the more valve opening is provided and vice versa. Thus. the heating plates are properly heated at all times to have the desired heat or curing capacity for the amount of board fabricated and passing thereover and to be properly cured. Qvercuring and undercuring, therefore, incident to speed variation of the machine is prevented.

The present system also contemplates the controis. to-wit, the valves and the thermometers and gal-ieee. all being positioned. together with the cleaning hose outlets. on the side of the machine adJacent which the operator usually has his station.

Theseveraltrapsinsuredischargeoi'airand condensation from the several supply lines, plates. rolls. drums, et cetera, when trapped. and to the return lino, or lines, thus live steam in said supply lines and rapid circulation through the steam heated devices.

Previous to this system, a standard corrugating machine has had some portions of the device lmproperly heated and to an extent of 100 P. The previous underlieating (local in character) resuits solely from water and air locking in come portion of a steam heated element. The present invention eliminates unequal. insuiilclent as well as excessive heating of elements. permits maximum operation. reduces "warm up" time and is automatically controlled for substantially perfect board fabrication.

While the invention has been illustrated and described in great detail in the drawings and foregoing description. the same is to be considered as illustrative and not restrictive in character.

The several modiiications described herein as well as otherswhich will readily suggest themselves to persons skilled in this art. all are considered to be within the broad scope ot the invention. reference being had to the appended claims.

The invention claimed is:

i. A heating system for a corrugated board machine including steam heated rolls, drums, and plates in combination with a steam supply and a steam return. of means independently connecting each of the rolls and drums to the supply, independent discharges from the rolls, drums and plates, trap means connecting certain of the drum, roll, and plate discharges to the return, means connecting the discharges of other certain or the rolls and drums directly to the plates ior the series heating of the latter, and a corrugated board machine speed responsive control device in said last mentioned connecting means for 'automatically regulating curing plate heating as required by the rate of board formation by the machine.

2. A heating system as donned by claim 1. characterized by the addition oi a controlled bypass around the control device lor the purpose described.

3. A heating system as donned by claim l, characterised by the addition ci a controlled bypass from the steam supply to the plates and around the control device for the purpose dcscribed.

4. A heating system as defined by claim 1. characterized by the addition of a controlled bypass around the control device, and a second controlled bypass from the steam supply to the plates and around the control device for the purpose described.

5. A heating system as donned by claim l, characterized by the addition of a controlled bypass around the control device. and a second controlled bypass from the steam supply to the plates and around the control device for the purpose described. said controlled bypasses having a common connection to the connecting means lncluding the control device and downstream of that control device.

6. In a corrugating machine having the usual steam heated corrugating and pressure rolls and heating drums. and heating plates for curing the paper board. the combination with a steam supply, of means supplying steam in parallel relation to the several rolls and drums, controls for each ot the parallel supply means, means supplying steam to the plates. a machine speed responsive governor valve arrangement for regulating the steam supply to said plates, the exhaust steam from the rolls and drums constituting the steam supply to certain plates, trap means for the various steam supplies, a bypass around the governor valve in the plate supply means and from the roll and drum exhausts, another bypass around the governor valve from the nrst mentioned supply to the plate supply means, and valve means in each bypass line for manual control thereof.

7. In a corrugating machine having the usual steam heated corrugating and pressure rolls and heating drums. a steam shower arrangement in parallel therewith. and heating plates for curing the paper board, the combination with a steam supply, oi means supplying steam in parallel relation to the several rolls, drums and shower arrangement from said supply, controls for each oi' the parallel supply means, means supplying steam to the plates, a machine speed responsive governor valve arrangement upstream ot the last mentioned means for regulating the steam supply to said plates. the exhaust steam from certain of the rolls and drums constituting a steam supply to certain plates, trap means for the various steam supplies, a bypass around the governor valve in the plate supply means and from the roll and drum exhausts, another bypass around the governor valve from the rst mentioned steam supply to the supply plate means. valve means in each bypass line for the manual control thereof, each exhaust from the said certain rolls and drums including an elector tip connection to the means supplying steam to the plates, and a return line from the shower steam supply means to the plate steam supply means and upstream of the several tip connections thereto and upstream of the governor valve control thereof.

NOAH M. SIMMONS.

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