US3377056A - Drying apparatus - Google Patents

Drying apparatus Download PDF

Info

Publication number
US3377056A
US3377056A US58069966A US3377056A US 3377056 A US3377056 A US 3377056A US 58069966 A US58069966 A US 58069966A US 3377056 A US3377056 A US 3377056A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
drying
medium
chamber
plenum
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Boye Ingar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/145Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning on the non-perforated outside surface of which the material is being dried by convection or radiation
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning

Description

April 9, 1968 i. BOYE DRYING APPARATUS Filed Sept. 20, 1966 ATT YS.

United States Patent iiice 3,377,056 Patented Apr. 9, 1968 3,377,056 DRYING APPARATUS Ingar Boye, Vaxjo, Sweden, assignor to Aktiebolaget Svenska Flaktfabriken, Stockholm, Sweden Filed Sept. 20, 1966, Ser. No. 580,699

Claims priority, application Sweden, Sept. 23, 1965,

2 Claims. (Cl. 263-3) ABSTRACT OF THE DISCLSURE A dryer for drying moving webs which are supported on a rotating heated cylinder comprising a hood having a plenum chamber therein adapted to direct drying medium against the web on the cylinder, the drying medium .comprising in part air returned from the drying cylinder through a fan, and in part ue gases from burners mounted in the plenum chamber.

The present invention relates to a dryer comprising a plenum chamber having at least one fan and at least one wall with means such as nozzles or apertures for directing gaseous medium onto the material to be dried.

The invention is intended primarily for use in drying moving webs or sheets such as paper webs or sheets of wall board. Such 'drying is conventionally carried out by blowing a hot gaseous medium, usually air, against the material to be dried from a plenum chamber having a wall, either perforated or equipped with nozzles, situated near the path of travel of the material. Before contacting the material toV be dried, the air is conventionally heated in an indirect heat exchanger having steam as the source of heat. Since the drying is more 'rapid if the temperature of the drying medium is raised, a higher temperature is striven 'for because in this way the dryer may be made smaller for a driven throughput of material.

When trying to raise the temperature of the drying medium by steam, the steam pressure must be increased above the saturation pressure of water vapor and soon reaches the point, at which, for reasons related to me- I chanical strength, the heat exchanger must be made very solid, and therefore heavy and expensive. At a temperature of 200 C., the saturation pressure is about 16 atmospheres for `water vapor, and with increase in teniperature the saturation pressure rises very rapidly. It is therefore scarcely worthwhile to adopt the use of steam for heat exchange, if high temperatures are desired. Aat 16 atmospheres, a drying-medium temperature of 160 to f 170 C. can be obtained without disproportionately large heat exchangers. o

To reach higher drying-medium temperatures, i.e. 180 C. or more, attempts have been made to use flue gases as a heat source instead of steam. In such case, the heatexchanger must be made so much larger, because the iilm coefficients of heat transfer between ue gases and the heat-exchange surface are considerably less than between condensing steam and the heat-exchange surface. In addition to this, problems arise in connection with the accumulation of soot on the heat-exchange surface which is in contact with the ue gas. Because of the large space requirements of such heat-exchangers, the heat-exchanger must be separated from the rest of the dryer and connected with the latter via ducts, which unfortunately are very bulky.

To eliminate the problem of soot accumulation on heatexchange surfaces when high drying-medium temperatures are desired, the heat exchanger may advantageously be replaced by a combustion chamber connected with a mixing chamber. The heating of the drying medium is effected through direct heat exchange with flue gases, which are produced in the combustion chamber and then mixed with the drying medium in the mixing chamber, to be taken then in heat-insulated ducts to the dryer and its plenum chamber. In this way, corrosion and accumulation of soot on the surfaces of a heat exchanger is avoided.

In summary, it may be stated that conventional constructions for dryers using drying-medium temperatures in excess of C. take up much space, because the space requirements of the heat exchangers or combustion chambers require these parts to be placed apart from the plenum chamber which is adjacent the material to be dried, and must be connected with the plenum chamber by means of bulky ducts.

In contra-distinction of this, the invention provides a compact dryer for temperatures considerably in excess of 180 C. A single space, i.e. the plenum chamber, serves both as a combustion chamber and mixing chamber. The bulky ducts of conventional dryers are eliminated, and the dryer does not require more space than a corresponding steam-heated dryer intended for temperature of up to 180 C. All the parts included in the dryer can be built together as a unit, so that the installation on the users premises can be restricted to the connection of pipes and wires for fuel and electricity. Moving the dryer between different machines on the users premises is simple. A conversion of an existing steam-heated dryer for maximal drying-medium temperature of about 180 C. to considerably higher temperatures can easily be effected in a short time and at low cost, using the same fans if the dryer is made in accordance with the present invention.

The invention will now be described in greater detail with reference to the accompanying drawings, which shows apparatus for drying paper on Yankee cylinder, wherein:

FIG. 1 is a cross section axis;

FIG. 2 is an enlarged view showing the perforated wall of the plenum chamber, as encircled in FIG. 1; and

FIG. 3 is a'view similar to FIG. 2 showing nozzles in the wall of the plenum chamber.

In the drawing, a rotating cast-iron cylinder 1, a socalled Yankee cylinder, is steam heated from the inside in the drying part of a paper machine. A web 2, for example paper, is conducted over the cylinder 1 and the cylindrical mantle surface of the cylinder is partly encompassed by a hood 3 enclosing a plenum chamber 4 and a suction chamber 5. Partition walls 6 separate the plenum chambers 4 and the suction chambers 5 and mount fans 7 which suck drying medium from the suction chambers 5 and blow it into the plenum chambers 4. One wall 8 of the plenum chamber is perforated with a number of vsmall holes 9 to direct drying medium from the chamber onto the web. The fans 7 are driven by motors 10 located outside the hood 3. In order to separate solid particles from the drying medium blown bythe fans 7, iiltersll are mounted in front of the fan inlets. The drying medium directed against the web 2 is returned to the suction chamber 5 by return pipes 12, the drying medium passing across the web 2 removing moisture therefrom to dry the same.

Fresh air is admitted to the suction chambers 5 through ducts 13, the chambers 5 being at a slight under-pressure in relation to the surroundings. The fresh air is mixed with the moist drying medium coming from the return pipes 12 and the mixture is sucked into the fans 7 through the lters 11. In order to restore the balance in the amounts of drying medium circulated, some of the mixture is blown otf from the plenum chambers 4 through ducts 14.

In order to heat the drying medium flowing from the fans via the plenum chambers and the holes 9 to the paper web, burners 15 are provided in the walls of the plenum at right angles to the cylinder chambers. Fuel is mixedrwith combustion air and transported to the burners 15 through pipes 16 and the flow is controlled by valves 20. Conventional burner accouterments are provided at 21 and 22. rlhe burners 15 open into the plenum chambers 4 and the mixture of fuel and combustion air burns with an open flame. 'l he iames are enclosed by casings 17 having an inner tireproof lining. The casings protect the walls of the plenum chambers 4 from radiated heat from the flames and direct the ow of combustion gases in a proper direction for the rapid mixing with the rest of the drying medium. At the exit from the casings 17, the combustion is completed and the velocity of the combustion gases may be as high as 500 m./sec. In this way, the relationship between the capacity of the burners, calculated as ow of heat, and their size is very favorable.

The casings 17 direct the combustion gases in a cone with a wide cone angle. The mixing with the drying medium is thus efficiently accomplished. With this type of burner, over-temperatures as small as 5 C. can be obtained 40 cm. from a burner. Preferably, the burners 15 and the fans 7 are placed in relation to each other so that upon exit from the casings 17, the combustion gas collides from the side with the stream of drying medium from the adjacent fan. It is preferable to insure intersection of the paths of the flue gases and the drying medium so that the axes of symmetry of the two streams lie essentially in the same plane, and in this plane the axes form an angle of between 25 and 160 with each other. Since the gas in both streams has a high absolute speed at the point f intersection, their relative velocity will be great which favors homogeneous mixing.

The function of the filters 11 is to catch the fibers from the web which are carried by the drying medium back to the return pipe 12. If the fibers were allowed to pass through the fans, some of them will be burned or charred in the plenum chambers, and on being blown against the web, would discolor the same. The fibers must also in some way be removed from the filter, and this is done in a known manner, i.e. in machines intended for continuous operation preferably through vacuuming with a device according to the copending U.S. patent application of Wallin, Ser. No. 544,650 filed Mar. 30, 1966. In the drawing, however, only doors 18 are provided in the hood, which during operation may be opened to receive a vacuum-cleaner nozzle which sucks off the fibers. In the suction chambers there is, during operation, a slight under-pressure, so that upon opening the doors 18 cold air from outside the hood goes into the hood and prevents the hot drying medium inside the hood from flowing against the person who opens the doors. Manual vacuuming of the fibers from the filters 11 is therefore easy to carry out during operation of the dryer.

A controller 19 is provided in conjunction with the power supply to the fans 7 to actuate valve means 20 in the fuel supply line 16 whereby the burner 15 is extinguished when the fans 7 stop.

The invention is, of course, not restricted to the form of design illustrated and described, but can be varied considerably within the scope of the appended claims.

Thus, for example, the burners may operate with liquid fuels such as lighter mineral oils or solid fuel particles such as coal dust. The casing 17, which encloses the ame may be dispensed with if measures are adopted to protect the surrounding parts from over-temperature due to heat radiation. The fans may be of axial or semi-axial type. The combustion air may be mixed wih the fuel either in advance of the burner as shown, or may be mixed directly in the burner.

I claim:

1. An apparatus for drying material comprising a plenum chamber having a wall confronting the material and means in said wall for directing drying medium from said chamber onto the material, fan means operable to discharge gaseous medium into said chamber, suction means leading from said material to said fan means to cycle gaseous medium from said material through said fan and said plenum chamber and back to said material, and means to heat said cycling medium, the improvement wherein said heating means comprises a plurality of burners mounted in said plenum chamber, and means to supply combustion fuel to said burners, said burners being mounted to direct hot flue gases into said plenum chamber to mix with the cycling medium therein whereby said drying medium includes flue gases, and said fan means comprises separate fan means for each of said burners.

2. In apparatus for drying endless web material cornprising a heated rotating cylindrical surface supporting said web, a hood surrounding said surface and mounting a plenum chamber having a wall confronting the material and means in said wall for directing drying medium from said chamber onto the material, fan means mounted on said hood operable to discharge gaseous medium into said chamber, suction means mounted on said hood leading from said material to said fan means to cycle gaseous medium from said material through said fan and said plenum chamber and back to said material, at least one burner mounted in said plenum chamber to heat said cycling medium, and means to supply combusion fuel to said burner, said burner being mounted to direct hot flue gases into said plenum chamber to mix with the cycling medium therein whereby said drying medium includes ue gases.

References Cited UNITED STATES PATENTS 2,218,282 10/1940 Downs 34-122 X 2,268,986 1/1942 Hess et al 263-3 X 2,268,988 1/1942 Hess et al 34-122 X 2,297,314 9/1942 Offen 263-3 2,471,802 5/1949 Walter et al. 34-160 2,473,629 6/ 1949 Andrews 263-3 2,604,313 7/1952 Grantham 263-33 2,731,732 1/1956 Harris et al 263-3 X 2,985,210 5/1961 Magnuson 34-122 X FREDERICK L. MATTESON, I R., Primary Examiner.

A. D. HERRMANN, Assistant Examiner.

US3377056A 1965-09-23 1966-09-20 Drying apparatus Expired - Lifetime US3377056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE1233465 1965-09-23

Publications (1)

Publication Number Publication Date
US3377056A true US3377056A (en) 1968-04-09

Family

ID=20295564

Family Applications (1)

Application Number Title Priority Date Filing Date
US3377056A Expired - Lifetime US3377056A (en) 1965-09-23 1966-09-20 Drying apparatus

Country Status (9)

Country Link
US (1) US3377056A (en)
JP (1) JPS494004B1 (en)
BE (1) BE686781A (en)
DE (1) DE1604789B1 (en)
DK (1) DK123423C (en)
ES (1) ES331113A1 (en)
FI (1) FI51518C (en)
GB (1) GB1153189A (en)
NL (1) NL6613480A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911863A (en) * 1972-09-23 1975-10-14 Agfa Gevaert Ag Test installation for single layer or multiple layer coating and drying of sheets of paper or film
US3984197A (en) * 1972-03-25 1976-10-05 Hoechst Aktiengesellschaft Device for the wet treatment and drying of textile material
US3984198A (en) * 1972-02-23 1976-10-05 Hoechst Aktiengesellschaft Device for the impregnation and drying of textile material
US3985498A (en) * 1972-06-21 1976-10-12 Hoechst Aktiengesellschaft Process and device for drying chemical products
US4064637A (en) * 1975-03-19 1977-12-27 Ab Svenska Flaktfabriken Cylinder dryer for paper machines
US4168580A (en) * 1972-06-02 1979-09-25 Maschinenfabrik Andritz Actiengesellschaft Drying installation for treating webs of material
US4523390A (en) * 1982-12-13 1985-06-18 Aer-Overly Corporation Peripheral exhaust system for high velocity dryer
US5383288A (en) * 1992-03-02 1995-01-24 Valmet Paper Machinery Inc. Method and device for drying paper
US5416979A (en) * 1994-04-11 1995-05-23 James River Paper Company, Inc. Paper web dryer and paper moisture profiling system
WO1995027877A1 (en) * 1994-04-08 1995-10-19 James River Paper Company, Inc. System for modifying the moisture profile of a paper web
US5632616A (en) * 1994-11-28 1997-05-27 Cadence Environmental Energy, Inc. Method and apparatus for injecting air into long cement kilns
US5784804A (en) * 1996-03-25 1998-07-28 Asea Brown Boveri, Inc. Yankee hood with integral air heating system
US6079115A (en) * 1997-09-24 2000-06-27 Asea Brown Boveri, Inc. High temperature Yankee hood
US6094838A (en) * 1997-05-28 2000-08-01 Asea Brown Boveri Inc. Curl and profile correction with high velocity hoods
US6631566B2 (en) 2000-09-18 2003-10-14 Kimberly-Clark Worldwide, Inc. Method of drying a web
US20070193060A1 (en) * 2004-03-02 2007-08-23 Nv Bekaert Sa Infrared drier installation for passing web
US20080034606A1 (en) * 2006-05-03 2008-02-14 Georgia-Pacific Consumer Products Lp Energy-Efficient Yankee Dryer Hood System
US20080256818A1 (en) * 2004-03-02 2008-10-23 Nv Bekaert Sa Drier Installation for Drying Web
CN100434272C (en) 2003-10-27 2008-11-19 海德堡印刷机械股份公司 Page printer with a dryer
US20160214405A1 (en) * 2013-08-29 2016-07-28 Hewlett-Packard Development Company, L.P. Variable humidity drying

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3008330A1 (en) * 1980-03-05 1981-09-17 Schmidt Gmbh Karl Fluessigkeitsgekuehlter; stoppers engine-
JPS57179354A (en) * 1981-04-28 1982-11-04 Mitsubishi Heavy Ind Ltd Piston for use in reciprocating engine
JPS57191847U (en) * 1981-05-30 1982-12-04

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218282A (en) * 1938-05-04 1940-10-15 Curtis Publishing Company Apparatus for printing
US2268986A (en) * 1938-05-03 1942-01-06 Interchem Corp Method and apparatus for drying printing ink
US2268988A (en) * 1939-08-08 1942-01-06 Interchem Corp Method and apparatus for drying printing ink
US2297314A (en) * 1939-03-04 1942-09-29 Offen Bernard Drying apparatus
US2471802A (en) * 1945-11-16 1949-05-31 Harold J Walter Apparatus for heat-treating air-pervious strip material
US2473629A (en) * 1944-11-16 1949-06-21 Bernard R Andrews Drying apparatus
US2604313A (en) * 1949-08-01 1952-07-22 Frederick W Grantham Drier
US2731732A (en) * 1953-05-19 1956-01-24 Crown Zellerbach Corp Apparatus and method for setting and drying moisture settable ink
US2985210A (en) * 1958-01-20 1961-05-23 Genevieve I Magnuson Treating apparatus for fruit and vegetable articles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR929390A (en) * 1946-05-23 1947-12-24 Dryer drum
US2499141A (en) * 1947-12-09 1950-02-28 Fair Lawn Finishing Company Heat-treatment of webs of textile materials

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268986A (en) * 1938-05-03 1942-01-06 Interchem Corp Method and apparatus for drying printing ink
US2218282A (en) * 1938-05-04 1940-10-15 Curtis Publishing Company Apparatus for printing
US2297314A (en) * 1939-03-04 1942-09-29 Offen Bernard Drying apparatus
US2268988A (en) * 1939-08-08 1942-01-06 Interchem Corp Method and apparatus for drying printing ink
US2473629A (en) * 1944-11-16 1949-06-21 Bernard R Andrews Drying apparatus
US2471802A (en) * 1945-11-16 1949-05-31 Harold J Walter Apparatus for heat-treating air-pervious strip material
US2604313A (en) * 1949-08-01 1952-07-22 Frederick W Grantham Drier
US2731732A (en) * 1953-05-19 1956-01-24 Crown Zellerbach Corp Apparatus and method for setting and drying moisture settable ink
US2985210A (en) * 1958-01-20 1961-05-23 Genevieve I Magnuson Treating apparatus for fruit and vegetable articles

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984198A (en) * 1972-02-23 1976-10-05 Hoechst Aktiengesellschaft Device for the impregnation and drying of textile material
US3984197A (en) * 1972-03-25 1976-10-05 Hoechst Aktiengesellschaft Device for the wet treatment and drying of textile material
US4168580A (en) * 1972-06-02 1979-09-25 Maschinenfabrik Andritz Actiengesellschaft Drying installation for treating webs of material
US3985498A (en) * 1972-06-21 1976-10-12 Hoechst Aktiengesellschaft Process and device for drying chemical products
US3911863A (en) * 1972-09-23 1975-10-14 Agfa Gevaert Ag Test installation for single layer or multiple layer coating and drying of sheets of paper or film
US4064637A (en) * 1975-03-19 1977-12-27 Ab Svenska Flaktfabriken Cylinder dryer for paper machines
US4523390A (en) * 1982-12-13 1985-06-18 Aer-Overly Corporation Peripheral exhaust system for high velocity dryer
US5383288A (en) * 1992-03-02 1995-01-24 Valmet Paper Machinery Inc. Method and device for drying paper
WO1995027877A1 (en) * 1994-04-08 1995-10-19 James River Paper Company, Inc. System for modifying the moisture profile of a paper web
US5465504A (en) * 1994-04-08 1995-11-14 James River Paper Company, Inc. System for modifying the moisture profile of a paper web
US5416979A (en) * 1994-04-11 1995-05-23 James River Paper Company, Inc. Paper web dryer and paper moisture profiling system
WO1995027879A1 (en) * 1994-04-11 1995-10-19 James River Paper Company, Inc. Paper web dryer and paper moisture profiling system
US5632616A (en) * 1994-11-28 1997-05-27 Cadence Environmental Energy, Inc. Method and apparatus for injecting air into long cement kilns
US5784804A (en) * 1996-03-25 1998-07-28 Asea Brown Boveri, Inc. Yankee hood with integral air heating system
US6094838A (en) * 1997-05-28 2000-08-01 Asea Brown Boveri Inc. Curl and profile correction with high velocity hoods
US6079115A (en) * 1997-09-24 2000-06-27 Asea Brown Boveri, Inc. High temperature Yankee hood
US6631566B2 (en) 2000-09-18 2003-10-14 Kimberly-Clark Worldwide, Inc. Method of drying a web
US20040010935A1 (en) * 2000-09-18 2004-01-22 Ross Russell F. Method of drying a web
US6977028B2 (en) 2000-09-18 2005-12-20 Kimberly-Clark Worldwide, Inc. Method of drying a web
US20060070259A1 (en) * 2000-09-18 2006-04-06 Ross Russell F Method of drying a web
CN100434272C (en) 2003-10-27 2008-11-19 海德堡印刷机械股份公司 Page printer with a dryer
US7926200B2 (en) * 2004-03-02 2011-04-19 Nv Bekaert Sa Infrared drier installation for passing web
US20080256818A1 (en) * 2004-03-02 2008-10-23 Nv Bekaert Sa Drier Installation for Drying Web
US20070193060A1 (en) * 2004-03-02 2007-08-23 Nv Bekaert Sa Infrared drier installation for passing web
US7918040B2 (en) * 2004-03-02 2011-04-05 Nv Bekaert Sa Drier installation for drying web
US7716850B2 (en) * 2006-05-03 2010-05-18 Georgia-Pacific Consumer Products Lp Energy-efficient yankee dryer hood system
US20100192403A1 (en) * 2006-05-03 2010-08-05 Georgia-Pacific Consumer Products Lp Energy-Efficient Yankee Dryer Hood System
US20080034606A1 (en) * 2006-05-03 2008-02-14 Georgia-Pacific Consumer Products Lp Energy-Efficient Yankee Dryer Hood System
US8132338B2 (en) 2006-05-03 2012-03-13 Georgia-Pacific Consumer Products Lp Energy-efficient yankee dryer hood system
US20160214405A1 (en) * 2013-08-29 2016-07-28 Hewlett-Packard Development Company, L.P. Variable humidity drying
US9731515B2 (en) * 2013-08-29 2017-08-15 Hewlett-Packard Development Company, L.P. Variable humidity drying

Also Published As

Publication number Publication date Type
DK123423B (en) 1972-06-19 grant
NL6613480A (en) 1967-03-28 application
ES331113A1 (en) 1967-07-01 application
JPS494004B1 (en) 1974-01-30 grant
DK123423C (en) 1972-11-06 grant
BE686781A (en) 1967-02-15 grant
FI51518B (en) 1976-09-30 application
GB1153189A (en) 1969-05-29 application
DE1604789B1 (en) 1970-06-04 application
FI51518C (en) 1977-01-10 grant

Similar Documents

Publication Publication Date Title
US3605717A (en) Convection oven
US4133636A (en) Tentor
US5014679A (en) Gas fired combination convection-steam oven
US3012335A (en) Treating web-like material by a gaseous medium
US5826496A (en) Cooking oven
US4268247A (en) Method for drying fabrics
US4669199A (en) Clothes dryer with a lint incinerator
US1825498A (en) Unit for heating, cooling, and ventilating system
US5528839A (en) Control and arrangement of a continuous process for an industrial dryer
US4665628A (en) Recuperative clothes dryer with enhanced recirculation and air flow
US3675600A (en) Recirculating dryer system
US5303484A (en) Compact convective web dryer
US4017254A (en) Recirculating furnace-dryer combination
US4028817A (en) Apparatus for recovery of heat from exhaust gases of dryer
US3417742A (en) Domestic oven
US1943053A (en) Internal combustion apparatus
US3085347A (en) Web breaking control in drying apparatus
US4378207A (en) Infra-red treatment
US5062280A (en) Air conditioning apparatus
US3208158A (en) Dryers
US5416979A (en) Paper web dryer and paper moisture profiling system
US3251402A (en) Air conditioning apparatus
US6154981A (en) Method and apparatus for improving the drying capacity of a hood covering a yankee cylinder
US2060430A (en) Treatment of webs of material
US3923449A (en) Multistage oven with progressive circulation