US2306019A - Drying apparatus - Google Patents

Drying apparatus Download PDF

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Publication number
US2306019A
US2306019A US300651A US30065139A US2306019A US 2306019 A US2306019 A US 2306019A US 300651 A US300651 A US 300651A US 30065139 A US30065139 A US 30065139A US 2306019 A US2306019 A US 2306019A
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United States
Prior art keywords
web
air
dryer
nozzles
chamber
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Expired - Lifetime
Application number
US300651A
Inventor
Milton E Hanson
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BF Sturtevant Co
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BF Sturtevant Co
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Publication date
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Priority to US300651A priority Critical patent/US2306019A/en
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Publication of US2306019A publication Critical patent/US2306019A/en
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    • F26B21/50—
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/04—Tenters or driers for fabrics without diagonal displacement

Definitions

  • Patented Dec. 22, 1942 DRYING APPARATUS Milton E. Hanson, Haddonfield, N. J., assignor to B. F. Sturtevant Company, Boston, Mass.
  • This invention relates to drying apparatus and relates more particularly to dryers using heated air for drying web material such as fabric, paper and the like.
  • the present invention provides a compact, highly efllcient dryer from which a minimum of heat escapes.
  • a feature of the invention resides in providing nozzles with slots extending cross-wise the web to be dried and in providing plates extending at right angles to the web, between and beyond the nozzles, and inclose proximity to the web.
  • the plates efiectively scrape off the air which ordinarily adheres due to surface tension, to the moving web and which ordinarily escapes from the dryer.
  • the plates also provide passages for conducting the air back to the blower and heater where it is mixed with fresh air and applied again to the web.
  • the plates also in cooperation with the nozzles provide turbulence in air flow thus expediting the drying action through breaking up the insulating air film which heretofore has adhered to the moving web.
  • Another feature of the invention resides in ar ranging a blower and air heater upon the casing of an insulated web drying chamber and in supplying heated air near the center of the chamber and withdrawing recirculated air at the nozzle ends.
  • An object of the invention is to improve the efliciency of web dryers.
  • Another object of the invention is to conserve the heated air used in a web dryer.
  • Another object of the invention is to reduce the space required for web dryers.
  • Fig. 1 is an elevation view partially in section of a dryer embodying this invention, with section taken along lines ll of Fig. 2;
  • Fig. 2' is a sectional view along the lines 2-2 of Fig. 1;
  • Fig. 3 is an enlarged view of the plate adjusting mechanism of Fig. 2, and
  • Fig. 4 is an end view of the plate and adjusting screw of Fig. 2.
  • the blower 5 and the heating chamber 9 are mounted on the upper side of the casing ti and serve to supply heated air therein.
  • the blower 5 draws fresh air past the damper 6 through the inlet 1, and recirculated air from the recirculated air chambers 8, moves the mixed air through the heating chamber 9, and discharges it through.
  • the outlet I I into the plenum space I2 above the lips l3, forming nozzles, for projecting the heated air at high velocity against the web 14.
  • the plates l5 extend cross-wise the dryer between the nozzle discharge slots formed by the adjacent nozzle lips l3, and extend, as shown by Fig. 2, beyond the web I4 and the nozzles on each side thereof, and cross-wise the bases of the recirculated air chambers 8.
  • the web moves through the dryer on the rollers 26, as shown by Fig. 1.
  • the plates l5 may be raisedand lowered as shown by Figs. 3 and 4.
  • the plates l5 have the extensions l6 and I! which are apertured to receive the bolts l8, either one or both of the apertures being tapped to receive the threads on the bolts.
  • the upper end of each bolt I8 is attached to the machine screw l9.
  • Each side 20 of the dryer has attached thereto, the flanges 2
  • the washers 22 space the heads of the screws l9 from the flanges 2
  • the drying air projected through the nozzles tends to adhere to the web l4 and not only forms an insulating film adhering to the web but is carried by the web from the dryer.
  • the plates l5 extending close to the web It scrape off, so to speak, the air film tending to adhere to the web and guide the air so collected, and the other air between the nozzles, into the recirculated air chambers 8 at each side of the dryer.
  • the plates I5 cause air turbulence in addition to that caused by the nozzles, providing the effect of additional nozzles without requiring additional air; they equalize the drying efiect of the air by guiding'it across the web so that no part of the web dries before another part, and add to the efiiciency and compactness of the unit by cutting down air and heat losses.
  • the plates I5 extend passages 8 are really exhaust passages and could a v be used as such without recirculation.
  • a dryer comprising a casing, a plenum chamber In said casing, means for supplying heated air into said chamber, means'for supporting a moving web in its travel through said dryer, means including a plurality oi nozzles each extending cross-wise said dryer and communicating with said chamber and converging towards said sup porting means for supplying high velocity, heated air upon the web, means forming an exhaust passage in said casing at one transverse side of aid dryer, and transverse plates extending crosswise said dryer between adjacent nozzles and extending beyond the tips thereof adjacent the web, in planes intersecting the plane of the web, and extending to said passage, for preventing air disnozzlesirom adhering to the moving web and for guiding the air deflected from the web into said passage, said nozzles and plates extending along substantially the entire path of travel of the web through said casing.
  • a dryer comprising a casing, a plenum chamher in said casing,
  • means including a plurality of nozzles each extending cross-wise said dryer and communicating with said chamber and converging towards said supporting means ior supplying high velocity, heated air upon the web, means forming exhaust air passages in said casing at the transverse sides of said dryer, and transverse plates between adjacent nozzles and extending beyond the tips thereof adjacent the web, in planes intersecting the plane oi the web, and extending to said passages, for preventing air discharged from the nozzles from adhering to the moving web and for guiding the air deflected from the web into said passages, said nozzles and plates extending along substantially the entirepath of travel of the web through said casing.
  • a dryer comprising a drying chamber for receiving a moving web to be dried, means for supporting a web for movement through said chamber, a plurality of nozzles spaced longitudinally and each extending crosswise said chamber above said means for projecting drying air upon the web, air moving and heating apparatus supported upon said chamber, a plenum chamber extending longitudinally of said chamber v above said nozzles and connecting therewith, the
  • transverse sides of said plenum chamber being spaced from the opposite side walls 0 said drying chamber for forming air recircu ation passages, means for supplying heated air from said apparatus into said plenumchamber, means including substantially vertical ducts extending outside said chambers to the ceiling of said drying chamber in alignment with said passages and connecting therewith ior recirculating air theretransverse plates extending crosswise said drying chamber to said passages and between said nozzles and extending beyond the tips of said nozzles towards the web, in planes intersecting the planeoi' the web, and serving to prevent air discharged from the nozzles from adhering to the web and for guidthe web into said passages and said ducts, and a duct above said ceiling, connecting with said ducts and said apparatus, for supplying air recirculated from said drying chamber to said apparatus.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Description

Patented Dec. 22, 1942 DRYING APPARATUS Milton E. Hanson, Haddonfield, N. J., assignor to B. F. Sturtevant Company, Boston, Mass.
Application October 21, 1939, Serial No. 300,651
3 Claims.
This invention relates to drying apparatus and relates more particularly to dryers using heated air for drying web material such as fabric, paper and the like.
It is the practice to pass sheet or web material such as paper or cloth through a dryer; to blow heated air upon the surface of the web, and to recirculate for reasons of economy, the air back through the heater and blower. In the past,
however, a great deal of the heated air escaped with the web leaving the dryer.
The present invention provides a compact, highly efllcient dryer from which a minimum of heat escapes.
A feature of the invention resides in providing nozzles with slots extending cross-wise the web to be dried and in providing plates extending at right angles to the web, between and beyond the nozzles, and inclose proximity to the web. The plates efiectively scrape off the air which ordinarily adheres due to surface tension, to the moving web and which ordinarily escapes from the dryer. The plates also provide passages for conducting the air back to the blower and heater where it is mixed with fresh air and applied again to the web. The plates also in cooperation with the nozzles provide turbulence in air flow thus expediting the drying action through breaking up the insulating air film which heretofore has adhered to the moving web.
Another feature of the invention resides in ar ranging a blower and air heater upon the casing of an insulated web drying chamber and in supplying heated air near the center of the chamber and withdrawing recirculated air at the nozzle ends.
An object of the invention is to improve the efliciency of web dryers.
Another object of the invention is to conserve the heated air used in a web dryer.
Another object of the invention is to reduce the space required for web dryers.
Other objects of the invention will be apparent from the following description taken with the drawing.
The invention will now be described with rei erence to the drawing, of which:
Fig. 1 is an elevation view partially in section of a dryer embodying this invention, with section taken along lines ll of Fig. 2;
Fig. 2' is a sectional view along the lines 2-2 of Fig. 1;
Fig. 3 is an enlarged view of the plate adjusting mechanism of Fig. 2, and
Fig. 4 is an end view of the plate and adjusting screw of Fig. 2.
The blower 5 and the heating chamber 9 are mounted on the upper side of the casing ti and serve to supply heated air therein. The blower 5 draws fresh air past the damper 6 through the inlet 1, and recirculated air from the recirculated air chambers 8, moves the mixed air through the heating chamber 9, and discharges it through. the outlet I I into the plenum space I2 above the lips l3, forming nozzles, for projecting the heated air at high velocity against the web 14.
The plates l5 extend cross-wise the dryer between the nozzle discharge slots formed by the adjacent nozzle lips l3, and extend, as shown by Fig. 2, beyond the web I4 and the nozzles on each side thereof, and cross-wise the bases of the recirculated air chambers 8. The web moves through the dryer on the rollers 26, as shown by Fig. 1.
The plates l5 may be raisedand lowered as shown by Figs. 3 and 4. The plates l5 have the extensions l6 and I! which are apertured to receive the bolts l8, either one or both of the apertures being tapped to receive the threads on the bolts. The upper end of each bolt I8 is attached to the machine screw l9. Each side 20 of the dryer has attached thereto, the flanges 2| which are apertured to receive the bolts I8. The washers 22 space the heads of the screws l9 from the flanges 2|. and the nuts 23 are soldered to the bolts 18 so as to revolve therewith below the flanges 2|. By revolving the heads of the screws l9 with a a screw driver, the position of the plates may be adjusted to suit any particular installation or operating condition.
The drying air projected through the nozzles tends to adhere to the web l4 and not only forms an insulating film adhering to the web but is carried by the web from the dryer. The plates l5 extending close to the web It scrape off, so to speak, the air film tending to adhere to the web and guide the air so collected, and the other air between the nozzles, into the recirculated air chambers 8 at each side of the dryer.
Other functions of the plates I5 are that they cause air turbulence in addition to that caused by the nozzles, providing the effect of additional nozzles without requiring additional air; they equalize the drying efiect of the air by guiding'it across the web so that no part of the web dries before another part, and add to the efiiciency and compactness of the unit by cutting down air and heat losses.
While it is preferred that the plates I5 extend passages 8 are really exhaust passages and could a v be used as such without recirculation.
A portion of the air leaving the web passes into the exhaust chamber 24 below the web and out the exhaust passage 25 to the atmosphere. This volume of exhaust air is, of course. equal, less such slight leaks as may occur, to the volume of entering through the inlet 1.
While one embodiment of the invention has been described for the purpose oi! illustration, it should be understood that the invention is not limited to the exact apparatus and arrangement of apparatus illustrated, as many departures therefrom may be suggested by those skilled in the art without departure from the essence of the invention.
What is claimed is:
1. A dryer comprising a casing, a plenum chamber In said casing, means for supplying heated air into said chamber, means'for supporting a moving web in its travel through said dryer, means including a plurality oi nozzles each extending cross-wise said dryer and communicating with said chamber and converging towards said sup porting means for supplying high velocity, heated air upon the web, means forming an exhaust passage in said casing at one transverse side of aid dryer, and transverse plates extending crosswise said dryer between adjacent nozzles and extending beyond the tips thereof adjacent the web, in planes intersecting the plane of the web, and extending to said passage, for preventing air disnozzlesirom adhering to the moving web and for guiding the air deflected from the web into said passage, said nozzles and plates extending along substantially the entire path of travel of the web through said casing.
2. A dryer comprising a casing, a plenum chamher in said casing,
air into said chamber, means for supporting a means for supplying heated extending crosswise said dryer from into said apparatus,
- ing the air deflected from moving web in its travel through said dryer, means including a plurality of nozzles each extending cross-wise said dryer and communicating with said chamber and converging towards said supporting means ior supplying high velocity, heated air upon the web, means forming exhaust air passages in said casing at the transverse sides of said dryer, and transverse plates between adjacent nozzles and extending beyond the tips thereof adjacent the web, in planes intersecting the plane oi the web, and extending to said passages, for preventing air discharged from the nozzles from adhering to the moving web and for guiding the air deflected from the web into said passages, said nozzles and plates extending along substantially the entirepath of travel of the web through said casing.
3. A dryer comprising a drying chamber for receiving a moving web to be dried, means for supporting a web for movement through said chamber, a plurality of nozzles spaced longitudinally and each extending crosswise said chamber above said means for projecting drying air upon the web, air moving and heating apparatus supported upon said chamber, a plenum chamber extending longitudinally of said chamber v above said nozzles and connecting therewith, the
transverse sides of said plenum chamber being spaced from the opposite side walls 0 said drying chamber for forming air recircu ation passages, means for supplying heated air from said apparatus into said plenumchamber, means including substantially vertical ducts extending outside said chambers to the ceiling of said drying chamber in alignment with said passages and connecting therewith ior recirculating air theretransverse plates extending crosswise said drying chamber to said passages and between said nozzles and extending beyond the tips of said nozzles towards the web, in planes intersecting the planeoi' the web, and serving to prevent air discharged from the nozzles from adhering to the web and for guidthe web into said passages and said ducts, and a duct above said ceiling, connecting with said ducts and said apparatus, for supplying air recirculated from said drying chamber to said apparatus.
MILTON E. HANSON.
US300651A 1939-10-21 1939-10-21 Drying apparatus Expired - Lifetime US2306019A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471802A (en) * 1945-11-16 1949-05-31 Harold J Walter Apparatus for heat-treating air-pervious strip material
US2682116A (en) * 1950-01-21 1954-06-29 Dungler Julien Method and apparatus for treating fibrous sheet material by superheated steam or vapors
US2779105A (en) * 1953-08-10 1957-01-29 Saco Lowell Shops Hot air dryer
DE1054024B (en) * 1953-04-24 1959-03-26 Tromag Trockenapp Und Maschb G Single-deck flat belt dryer for veneers
DE1059872B (en) * 1953-12-05 1959-06-25 Bertil Fredrik Helgesson Mellb Device for drying web-shaped goods, such as textile fabrics, paper or the like.
DE1091074B (en) * 1955-02-03 1960-10-20 Artos Maschb Dr Ing Meier Wind Device for treating, in particular drying, of loosely or freely floating webs within the treatment chamber, in particular webs of fabric
US3176412A (en) * 1961-01-04 1965-04-06 Thomas A Gardner Multiple nozzle air blast web drying
US4216591A (en) * 1978-11-29 1980-08-12 American Screen Printing Equipment Co. Dryer for printed material
EP0370503A1 (en) * 1988-11-24 1990-05-30 Wilfried Wiesenborn Drying apparatus for heat-sensitive and easily inflammable materials
EP1174670A1 (en) * 2000-07-17 2002-01-23 WindmÀ¶ller & Hölscher Drying chamber for drying a printed web
US20070277392A1 (en) * 2004-12-23 2007-12-06 Mann & Hummel Protec Gmbh Method for drying synthetic resin pellets
US20150067996A1 (en) * 2012-04-20 2015-03-12 Unicharm Corporation Method and device for recovering bulk of nonwoven fabric

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471802A (en) * 1945-11-16 1949-05-31 Harold J Walter Apparatus for heat-treating air-pervious strip material
US2682116A (en) * 1950-01-21 1954-06-29 Dungler Julien Method and apparatus for treating fibrous sheet material by superheated steam or vapors
DE1054024B (en) * 1953-04-24 1959-03-26 Tromag Trockenapp Und Maschb G Single-deck flat belt dryer for veneers
US2779105A (en) * 1953-08-10 1957-01-29 Saco Lowell Shops Hot air dryer
DE1059872B (en) * 1953-12-05 1959-06-25 Bertil Fredrik Helgesson Mellb Device for drying web-shaped goods, such as textile fabrics, paper or the like.
DE1091074B (en) * 1955-02-03 1960-10-20 Artos Maschb Dr Ing Meier Wind Device for treating, in particular drying, of loosely or freely floating webs within the treatment chamber, in particular webs of fabric
US3176412A (en) * 1961-01-04 1965-04-06 Thomas A Gardner Multiple nozzle air blast web drying
US4216591A (en) * 1978-11-29 1980-08-12 American Screen Printing Equipment Co. Dryer for printed material
EP0370503A1 (en) * 1988-11-24 1990-05-30 Wilfried Wiesenborn Drying apparatus for heat-sensitive and easily inflammable materials
EP1174670A1 (en) * 2000-07-17 2002-01-23 WindmÀ¶ller & Hölscher Drying chamber for drying a printed web
US20070277392A1 (en) * 2004-12-23 2007-12-06 Mann & Hummel Protec Gmbh Method for drying synthetic resin pellets
US20150067996A1 (en) * 2012-04-20 2015-03-12 Unicharm Corporation Method and device for recovering bulk of nonwoven fabric
US9637851B2 (en) * 2012-04-20 2017-05-02 Unicharm Corporation Method and device for recovering bulk of nonwoven fabric

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