US2742274A

US2742274A - Web dryer

Info

Publication number: US2742274A
Application number: US287198A
Authority: US
Inventors: Torsten F A Edvar
Original assignee: Selas Corp of America
Current assignee: Selas Corp of America
Priority date: 1952-05-10
Filing date: 1952-05-10
Publication date: 1956-04-17
Anticipated expiration: 1973-04-17

Description

April 17, 1956 T. F. A. EDVAR WEB DRYER 2 Sheets-Sheet 1 Filed May 10, 1952 INVENTOR. TORSTEN F.A. EDVAR ATTORNEY.

T. F. A. EDVAR WEB DRYER 2 Sheets-Sheet 2 Filed May 10, 1952 INVENTOR. TORSTEN F. A EDVAR ATTORNEY.

ME MH m w m w fi cit 9 m m Mn 6 N 0 n WEB-DR ER- Iorsten .A- Ed a B ilade r ia, Pa-t, t ssi or -.t S las Corporation .01 America, ,Pthilatlel phia, 112., .a corporation of Pennsylvania L ApplicationMay 10,1952, Serial'No.'287', 1

' dOQlaims. n. ago-=3 The present ,invention relates "il-'0V8!lS, and more particularly to an oven which is used to dr'y aweb, or material placed :on a :web, such as drying ink on a'we'b of web, In times of emergency whenthe'press' is stopped,

the 'heat must be quickly cut off to prevent damage to the .web. Even though the heat may be reduced quickly, the

residual heat in the device is often suflicient to damage the'web; Furthermore, when there is' a -web break,='it-'i's difficult to threaduthe web thr'ougha dr yertwhenfitis hots It is-anobject of theinventionito provide .a'wejb drying "device in which the heated parts oft-hedevice'areimoved away from the ,webwhenthepress is stoppedror the-web breaks. q r

It is a further object 10 fthe invention-t0 provide a compacttweb dryer-that can be ibuilt into a printing press .in such a manner that the web :will pass through the dryer as the web movesalong path through the press.

his a further vobject of tthe inventionto providea Web dryer that does not touch the web at any time, tand one thatcan be used to dry either or both sides-of the ,Web as desired. r

The dryer of the present invention includes a :pair-of U-sh-aped oven sections that are :mounted on rails in a press structure in such a manner that awrectangula-r pas sage is formed through which theweb travels. Burners are located in the legs of each section andzfacing :the web so that both sides of the web are'sheated as it is moving through :the passage. The'ovensections are mountedfor movement transversely to the path of travelof the-web. Therefore, they can be separated and movcd away from thewebwhensuch actionisrequired. r

a The dryer .oflthe present inventionisparticularly ,de-

' signed to be used with'a printing press for drying the ink that has been placed ,ona web of paper. Itwill be apparent, however, that it can be used'to advantage at any place where heat is to be app-liedxto a moving web V or strip.

The various featureszof novelty which characterize my invention are pointed out withparticularity in'the claims annexed to and forming a part of this -speoification.- For 1 a better understanding of the invention, however, :its ad r 2,742,274 7 Patented Apr. 1956 Figure 3 is an end 'view of the dryer;

cooled rolls 4 prior to the time it is forwarded to some other portion .of the press. The dryer is located between the impression rolls and the guide roll and is mounted on a suitable portion of the press frame -in such a position thatthe web can pass through it in 'an unsupported length. r

he dryer is composed of 'two sections 5 and 6 that are substantially U-shaped as shown best in Figure 1 of the drawing. When the legs of the sections engage each other, as shown, they form an ovenachamber 10 that is open at 'both ends and through which the web is moved. Theoven sections 5 and-6 are mirrorimages of each other, so a description of one will be sufficient. Each section comprises a rigid supporting frame 7 upon the lower portion of which "is mounted the lower half 8 of :the section. W This half is constructed in accordance with. ordinary furnace practice and-includes as a part of the chamber wall a number of rows'of burners 9, shown :ing refractory 11'.

Patent) .2,211 S,079 issued September 1 7," 1940. 1 Burners of this-type, as disclosed in detail inthe patent, are pro .vided'with acup-shaped:depression into which a mixture of fuel and air is supplied in a series of substantia"lly"radiallydirected'jets. The-jets-offuelmixture are burned 'in' the cupstoheat them todncandes'cence withoutzflames extending'beyond the cup. Therefore, radiant heat of high'intensity is supplied from the cups to the web. :In addition, heatris obtained from the hot products of combustion released as thefuelis-burried. The upper halfof the sectionismindicated at 12. This section also includes four rows of burners 13 of the same-type as burners '9 and backed up 'by a suitable insulating refractory 14. Theseburners are mounted in what is in elfect thereof of the section in-accordance withordinaryfurnace practice.' The upper half 12 of'section 5 is rigidly bolted to the supporting frame 7, and may be removed when occasiondemands by removing the bolts andlifting it:by suitable crane. i

The entire section is-mounted on wheels 15 that travel along tracks which are located in the press frame and transverse to the direction of :web travel. Referring to the Figures 3 and 4, it Willbe-seen thatthe wheels 15 on the right are provided with a groove that rides along a vertical web on :the track 16. This arrangement guides the section for movement perpendicular to the web and maintains the parts at all time in alignment. The wheel 1'5a on the :left of the dryer in Figures 3 and 4"has a flat tread which rollsralong the flange of a track member 16a in the shape-of an Hbeam. This arrangement permits slight expansion and contraction of the dryer due tothe heatwithoilt causing buckling of the section parts.

Each row of:burners in both the upper and lower halves f the section is supplied by a manifold 17. Extending from the manifolds to the individual burners are pipes whichhave in them :valves 18. The manifolds 17 in the topandbottompoftions are in turn supplied by manifolds 1 9 and 19a, respectively, extending length-wise of the furnac chamber. The manifold 19a for the lower half Figure 4 is a section view taken on line 4-4 o'fFigure supply pipe. It is noted that pipe 21 has a valve 22 in it and a valve 23 is provided up-stream of upper manifold 19. These valves permit the fuel'to either the upper or lower burners to becut off if desired. The main fuel supply is so arranged that the burners will get fuel in any position of the section. To this end, fuel is supplied from a main pipe 2 4 through

pipes

25 and 26 to the pipes leading to

manifolds

19 and 19a. Swivel joints 2'7, 28 and 29 are provided, as shown, between the pipes. Therefore, when the sections are moved from their closed position as shown to their open position, the angles between the pipes will be changed at the swivel joints as shown in dotted lines on the right side of Figure 2.

When the press is threaded, or when the press is stopped I ment of that section is used to move section 6. To this end there is provided. a chain or other suitable flexible member 34 which passes around

pulleys

35 and 36. The chain is fastened to section 5 by means of an arm 37 extending downwardly therefrom and is fastened to-section 6 .bymeans of a similar arm 38. The cylinder, which may I be either hydraulic or pneumatic, has fluid supplied to one end of itby a pipe-39 and to the other end by a pipe 41. A valve 42, having a valve stem 43, is usedto direct the fluid to the proper one ,of the pipes. This valve may be operated manually, or it may. be operated automatically in accordance with the. operation of the press. For this purpose, the valve rod 43 has attached to its end a. core .44 of solenoid 45.. Power is supplied to the solenoid in accordance with the operation of the-press- The arrange- Thereaften when the pressis started,the oven sections move together to the position shown in the drawings. The burners are lit, and heat produced by these burners will dry the web as it is moving from the impression cylinders through the oven and to another portion of the press. If, for some reason, the press stops, the sections of the oven may be opened either manually or automatically as explained above in order to remove the heat from the web so that the web will not be burned. Ordinarily, it takes a short period of time for a press to stop after the power has been disconnected. The arrangement of the piston rod 31 and cylinder 32 will be such that the speed of opening of the oven sections will be correlated with the speed of stopping of the press, so that the oven will be completely open by the time the press is stopped. In a like manner, the speed of operation of the moving parts for the oven will be such that the sections of the oven are moved together by thetime the press has picked up speed after it hasbeen started.

' In an oven of the type disclosed herein for a web 4 feet wide, it is only necessary that each section of the oven be moved slightly over 2 feet. This small movement of the oven sections can easily be accommodated within the framework of the'average press. When the burners are being operated,ithe temperature of the cups in the burners will be between 18 O0 and 2000 F. This will produce an over-all oven temperature of approximately 1500". With the temperature at this value, it is possible to, dry the ink on a web rnovingata speed of 1000 feet a minute with an: oven having a length of approximately 2 /2 feet. An

- oven of this short length can easily be placed within the framework of the average press, even when the necessary ducts are located onleach side thereof.

. A'drying oven of the type shown herein is particularly useful in connection with-an offset printing press where ink-is. placed simultaneously on both sides of the web of paper. The,-:dryer can-be used,-however, withany kind ment is such that fluid is normally suppliedtoth'e cylinder 1 through pipe 39. When, however, the press is stopped, solenoid 45 will be, de-energized and the-valve will be moved under a suitable spring bias to direct the fluid supply through pipe 41. Therefore the piston rod 31 will be moved to the left to move, in turn, the section 5 of the oven away from the web. As this section is moved, it operatesthrough the chain 34 and

arms

37 and 38 to move the section 6 of the oven away from the right side of the web. The operation of the press can also be used to control the supply of fuel to the burners. To this end, there is provided an automatic valve 47 in the fuel line. When the press is running, the valve 47 will be open to supply fuel. When, however, the press is stopped valve 47 will'be energized for operation in a direction to reduce the supply of fuel to either a minimum or to cut it off as a result of burning fuel in the burners 9 and 13; mustbe removed from the oven chamber. Ducts are provided for this purpose, and they are shown best in Figures 2 and 4 on opposite ends of the oven at 48 and 49 respectively. Each of the ducts is provided on its outside with a slot 51 and on its inside with a slot 52. These slots are aligned with the oven chamber, sothat the web may move directly into and from the oven by passing through the ducts. It is noted that the, inside slots 52 of each duct are extended beyond the ends of the oven sections when they are in their closed positions. This is for thepurposeof withdrawing products of combustion from the oven chamber when the oven is in its open position. The ducts can be extended beyond one side of the press as shown in Figures of press. If the web has been printed on only one side, either the topor the bottom, the fuel supply to the burners 'on either the top or the bottom portions of the oven sections can be .shut off by proper manipulation of

valves

23 and 22 respectively. As shown herein, the web is of a width that extends from one side to the other of the oven. From time to time, it may be desirable to supplythe press with a web that is only a fraction of the maximum width normally used. When this is the case, the burners which are not above or below the web can be cut off by closing valves 18. Thus, only those burners which are necessary for the type of printing and the width of the web are required to be in operation.

From the above description, it will be seen that I have provided a web dryer which is short in length and ma therefore, be mounted readily within the frame of the average printing press. The dryer is so. designed that the web passes through it in an unsupported length directly from the impression cylinders. The dryer is also designed so that it can'be removed from proximity to' the web whenever this is necessary or desirable.

While in accordance with the provisions of the statutes, I have illustrated and described the-best form of embodiment of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit and scope of the invention as set forth in the appended claims, and that in some cases certain features of my invention may be used to advantage without a corresponding use of other features.

What is claimed is:

1. In a web dryer, the combination of a pair of oppositely disposed U-shaped oven members arranged to form a substantially rectangular passage open at the ends through which a web to be dried is moved in a path, means located in the legs of the U of said oven members to supply heat toopposite SidesOf said passage, means to mount said oven members for movement toward and from each other in a direction perpendicular to the path of travel of the web and parallel to the surface thereof, and means to move said oven members toward and from each other whereby heat can be applied to or removed 7 parts are removed from and beyond opposite edges of the web, means to move said parts between said two positions, burner means in said parts, and means to locate said burner means adjacent to the surface of the web traveling through said oven structure to heat the web as it is being moved through the same.

3. In a device for heat treating a web, the combination of structure forming a rectangular chamber open at both ends and through which a web travels along a predetermined path, means forming part of said structure to supply radiant heat from a side of said chamber against the surface of a web traveling through said chamber, said structure being divided into individual sections lengthwise of said chamber, means to mount each of said sections for movement in a direction perpendicular to the path of 4. In a device for heattreating a web, the combination of structure forming a pair of U-shaped sections mounted with the ends of the U adapted to engage each other to form a substantially rectangular furnace chamber open at its ends and through which a web travels, means to fuel to said burners in any position of said sections, means to move said sections between the above mentioned positions, and a'duct separate from said sections at the end of said furnace chamber to withdraw the products of combustion from said burners.

5. The combination of claim 4 in which the burners are located in both legs of each U-shaped section whereby heat may be supplied to each side of the web, and means to control the supply of fuel separately to the burners of each leg of each section.

6. In a dryer for a web moving in a path, a pair of cooperating structures each extending partly across the surfaces of the web on both sides thereof, said structures cooperating to form a rectangular chamber open at both ends through which the web travels, burners in said structures directed toward both sides of said web, means to move said structures transversely to the web between a first position in which said rectangular chamber is formed and a second position in which said structures are removed from said web beyond opposite edges thereof, means to supply fuel to said burners in any position of said structravel of said web and parallel to the surface thereof, and means to move said sections toward and from each other.

6 ture,.and ducts through which the web passes at each end of said chamber.

7. The combination of claim 6 including means to shut oif the supply of fuel in each structure to the burnerson one side of the web.

8. In a device for heating a web as it is traveling through a path, the combination of apparatus including a pair of substantially U-shaped sections adapted when their ends are in engagement to form a passage open at its ends through which the web travels, means to move said sections from their position in which said passage is formed transversely to a position in which each section is beyond one edge of the web, burners located in each section to heatthe surface of said web as it is moving through said passage, and duct means adjacent to each end of said passage through which products of combustion from said burners are Withdrawn, each of said duct means being provided with slots aligned with the ends of said passage through which the web passes as it enters and leaves said passage.

9. In a device for drying a web moving through a path, the combination of a pair of tracks extending transversely to said path, a pair of U-shaped oven sections traveling on said tracks on opposite sides of said path from a posi tion in which they engage each other and surround the web to positions retracted from said web, burner means insaid sections to supply heat to said web, fuel supply means operable to supply fuel to said burners inany position of said sections, ducts extending transversely of said web at each end of said sections operative to withdraw the products of combustion from said sections, said ducts being formed with slots on each side thereof through which the web passes on its Way to and from said sections.

10. Apparatus for heating a strip of material traveling in a path having a straight portion therein, the combination of heating means in the form of a U, means to support said heating means so that the legs of the U project inwardly from an edge of the strip adjacent to the opposite surfaces'of the strip as it moves through said portion of said path, burners in the legs of the U to direct heat toward the opposite surfaces of said strip, mechanism operative to move said heating means in a straight path from a position in which the legs thereof extend across the surfaces of the strip to a position in which the legs thereof are withdrawn beyond the edges of the strip, and means to supply fuel to the burners in any position of the heating means.

References Cited in the file of this patent UNITED STATES PATENTS 378,266 Simonds Feb. 21, 1888 1,676,176 Biggert July 3, 1928 2,015,699 Trainer et al. Oct. 1, 1935 2,119,261 Andrews May 31, 1938 2,325,950 Greene et al. Aug. 3, 1943 2,371,161 Felber Mar. 13, 1945 2,409,431 Hess Oct. 15, 1946 2,571,815 Benoit et al. Oct. 16, 1951 FOREIGN PATENTS 386,412 Great Britain Jan. 19, 1933