US3456361A - Apparatus for conditioning of webs of material - Google Patents

Apparatus for conditioning of webs of material Download PDF

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Publication number
US3456361A
US3456361A US657268A US3456361DA US3456361A US 3456361 A US3456361 A US 3456361A US 657268 A US657268 A US 657268A US 3456361D A US3456361D A US 3456361DA US 3456361 A US3456361 A US 3456361A
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United States
Prior art keywords
web
section
medium
sections
channels
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Expired - Lifetime
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US657268A
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English (en)
Inventor
Olaf August Gunderson
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Alfsen og Gunderson AS
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Alfsen og Gunderson AS
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    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B15/00—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours
    • D06B15/12—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours up to the moisture regain of the textile material
    • 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

Definitions

  • the medium is uniformly distributed across the width of the material by providing a plurality of separate fluid-applying and -withdrawing sections transversely of the width of the material.
  • the supply of fresh medium and the exhaust of spent medium are controlled by dampers, and a predeterminable proportion of the medium can thus be recirculated into contact with the material thereby to reduce the net rate of supply and exhaust of the medium.
  • the dividing line between adjacent sections departs from the direction of travel of the material so that no untreated areas remain between sections.
  • the present invention relates to an improvement in apparatus for conditioning of various materials in the form of webs.
  • the conditioning may include heating, cooling, drying, moistening, thermosetting or other forms of heat treatment, while the materials in question may be webs of textiles, fabrics of synthetic materials, cellulose, paper, felt for paper machines and the like.
  • the conditioning may also include removal of volatile solvents and also application of chemicals to the web if required.
  • webs is in the present case not to be understood as referring only to continuous bands of materials, but can also include sheets of material, for example cardboard to be treated in a suitable manner.
  • the temperature of the web may be controlled by regulating the temperature of the air, by adjusting the speed of the air flow or by other methods.
  • One is, however, confronted with a substantial problem with regard to achieving an even distribution of the supply or removal of heat from the web of material or of other media to be transferred to or removad from the web, and this problem is more complicated the greater the width of the web.
  • paper machines in use at the present time may have a web width of 8 to 10 meters, which means that, during production, the web of the paper machine prior to the drying process may have a width of 12 meters.
  • the medium to be supplied to the web and withdrawn from same through respective nozzles and openings is conveyed to the nozzles through long channels which extend across the whole width of the web of material, and when said channels are of the length mentioned above, the pressure drop in the channels, from one end to the other, results in an uneven distribution of heat to the web, and thereby uneven temperature, which then causes for example an uneven thermosetting or drying.
  • the object of the present invention is primarily to overcome the above mentioned disadvantages so as to achieve, in a far more satisfactory manner than has previously been possible, an even conditioning, for example by controlling the temperature over the whole Width of the web of material.
  • an even conditioning for example by controlling the temperature over the whole Width of the web of material.
  • each section is connected to channels or conduits for supply and withdrawal of conditioning medium (for example hot air for drying or heating) and, in addition, each section contains a blower with channels and chambers in connection with the blower in such a way that the medium blown onto the web of material through suitable nozzles and withdrawn immediately from the web through openings, is circulated through the section and returned to the nozzles to increase the utilization of the active properties of the conditioning medium used to treat the web of material.
  • the treatment may, as mentioned above, consist in supply or removal of heat, moistening etc.
  • a certain quantity of unused medium may be supplied to the sections from the supply channel which extends along and is connected to all of the sections of the drying apparatus and at the same time, a corresponding quantity of used medium may be withdrawn through the suction channel, which in the same way is connected to all the sections of the apparatus.
  • the supply of treatment medium and withdrawal thereof takes place through suitable openings provided with valves, and by adjustment of these valves it is possible at all times to control for example the heat quantity or quantity of moisture supplied and thereby also the treatment of that width of web of material upon which one section acts. In this way one achieves, amongst other things, an improved distribution of active components or properties and a more expedient utilization of same in the medium, without the necesstiy of conveying the medium in long channels prior to its being recycled to the web of material.
  • a blower in each section ensures constant blowing velocity for the treatment medium at all times and in all locations.
  • the temperature or other properties of the medium are regulated or held constant by varying the supply of unused medium by means of the two valves described hereinbefore. Constant speed and properties of the treatment medium are thus achieved, but it is possible to control or adjust both as desired. The result is a uniform and stable conditioning of the web of material, and the blowing velocity is reduced by decreasing heat requirement.
  • the invention thus concerns an improvement in an apparatus for conditioning webs of materials, for example textiles, fabrics, cellulose, paper, felts for paper machines, and also sheet material, for example cardboards and the like, and the apparatus is of the type in which a conditioning or treatment medium which is to be blown onto the web of material and withdrawn therefrom by suction, is supplied and withdrawn through channels and conduits extending over the entire width of the web transversely of its direction of travel, the supply and withdrawal of the medium being carried out through suitable nozzles and openings respectively which are in communication with said channels and are directed to the web of material on one or both sides thereof, and the invention is mainly characterized in that the apparatus is divided into sections extending in juxtaposed position transversely of the longitudinal direction of the web and is connected to said channels, and provided with equipment for circulation of some or all of the withdrawn conditioning medium prior to said medium being conveyed into the suction channel.
  • a further and important feature according to the invention is that the direction of the dividing line between adjacent sections departs from the direction of travel of the web.
  • the equipment for recirculation of the treatment medium comprises a blower separately driven, and adjustable valves for regulating the quantity of treatment medium to be recirculated or renewed, and it is also a distinguishing feature of the invention that each section is constructed around a blower, the pressure side of which is connected to at least one pressure chamber which is connected to blowing nozzles, the suction side of said blower being connected to the suction openings and having two valves leading to respective channels for supply and withdrawal of the treatment or conditioning medium.
  • FIG. 1 very simply and purely diagrammatically shows a section seen in perspective with some of the walls removed to disclose the interior of the section, and
  • FIG. 2 shows, also diagrammatically, a top view of parts of adjoining sections.
  • the main channel for supply of hot air and for withdrawn air extends the whole width of the web of material. On the drawing, however, only the portion located beneath a section of the drying apparatus is shown.
  • the control valve which may be coupled to and controlled by temperature sensors at the web of material, leads from the main channel into a suction chamber connected to the suction side of a circulation blower which circulates air about a path within the associated section.
  • the pressure side of said blower opens into the pressure chamber which is located on both sides of the sections in the embodiment shown.
  • Nozzles are in communication with the pressure chambers for blowing the hot air onto the web and, in the shown example, they are in the form of channels having narrow slots directing the air onto the web of material to be dried.
  • suction openings formed between the nozzles for the hot air.
  • the withdrawal openings may be limited by a plate provided with holes disposed over the nozzle channels. This is indicated at one end of the shown section, and the nozzles for hot air and the withdrawal openings for the same air are evenly distributed on the top side of the section, e.g. over a length of two meters and a w1dth of 1.2 meters.
  • the control valves in the main channel are both on the suction side of the blower and are coupled together so that they open respectively to the same extent.
  • control valve is then closed and the section operates as an independent unit.
  • further heat energy must be supplied by further supply of hot air. This is accomplished by opening the control valves in the main channels for hot air.
  • the control system is preferably constructed so that the valves, during normal operation, operate constantly in intermediate positions, i.e. neither entirely open nor entirely closed.
  • hot air from main channel 6 passes through control valve or damper 7 into suction chamber 8 and thence into the suction side of blower 9.
  • the hot air emerges from the pressure side of blower 9 and is divided and passes into pressure chambers 10 on either side of suction chamber 8.
  • Pressure chambers 10 open upwardly only through conduits in the form of channels 11, which of course do not communicate at all with suction chamber 8.
  • channels 11 open upwardly through narrow slots 12, which in turn are directed upwardly through the holes 13 in plate 14 over which the material travels.
  • the hot air after having thus contacted the material, passes back down through holes 13 to the spaces between channels 11, which spaces communicate with suction chamber 8. Part of the returning air is recirculated to the suction side of blower 9; while the rest passes through control valve or damper 15 to exhaust channel 16 from which it is discharged.
  • each section affords heat treatment to a tenth part of the width of the web, and, with the means hereinbefore described, it is evident that each section is capable of effecting the same heat treatment of the web passing the section, regardless of where the section is located in the width.
  • an apparatus for conditioning the web of material constructed in accordance with the invention, also offers the extremely important advantage that the apparatus in a very simple manner can be adapted to the conditioning or treatment of webs of varying widths. If both control valves are closed in a section and the circulation blower is stopped, the section will be out of operation, and for a narrower width than the maximum for which the apparatus is constructed, it is possible to select the sections desired to be in operation, these being selected from either side of the apparatus or disposed centrally in order to distribute the wear and tear on the treatment sections during the course of time.
  • the extremely accurate control of the conditioning of the whole width of the web is particularly important for thermosetting of certain artificial materials which requires great accuracy.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Bridges Or Land Bridges (AREA)
US657268A 1966-10-31 1967-07-31 Apparatus for conditioning of webs of material Expired - Lifetime US3456361A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO165406A NO120457B (enrdf_load_html_response) 1966-10-31 1966-10-31

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US3456361A true US3456361A (en) 1969-07-22

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US657268A Expired - Lifetime US3456361A (en) 1966-10-31 1967-07-31 Apparatus for conditioning of webs of material

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US (1) US3456361A (enrdf_load_html_response)
DE (1) DE1635143A1 (enrdf_load_html_response)
GB (1) GB1151159A (enrdf_load_html_response)
NO (1) NO120457B (enrdf_load_html_response)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59225277A (ja) * 1983-06-02 1984-12-18 和歌山鉄工株式会社 布帛処理用熱風浄化循環装置
DE4009313C2 (de) * 1990-03-23 1999-01-07 Dornier Gmbh Lindauer Belüftungssystem zum Wärmebehandeln von flachen Materialbahnen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919495A (en) * 1954-04-15 1960-01-05 Bowater Res & Dev Co Ltd Process of papermaking
US3052991A (en) * 1959-02-24 1962-09-11 Midland Ross Corp Apparatus for uniform accelerated drying of web material
US3089252A (en) * 1959-04-22 1963-05-14 Beloit Iron Works Web moisture profile control for paper machine
US3203678A (en) * 1963-05-01 1965-08-31 Warren S D Co Temperature control system for rolls
US3214845A (en) * 1961-05-24 1965-11-02 Industrial Nucleonics Corp Moisture measuring and selective dryer control system
US3284920A (en) * 1964-01-17 1966-11-15 Valmet Oy Apparatus for drying web material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919495A (en) * 1954-04-15 1960-01-05 Bowater Res & Dev Co Ltd Process of papermaking
US3052991A (en) * 1959-02-24 1962-09-11 Midland Ross Corp Apparatus for uniform accelerated drying of web material
US3089252A (en) * 1959-04-22 1963-05-14 Beloit Iron Works Web moisture profile control for paper machine
US3214845A (en) * 1961-05-24 1965-11-02 Industrial Nucleonics Corp Moisture measuring and selective dryer control system
US3203678A (en) * 1963-05-01 1965-08-31 Warren S D Co Temperature control system for rolls
US3284920A (en) * 1964-01-17 1966-11-15 Valmet Oy Apparatus for drying web material

Also Published As

Publication number Publication date
GB1151159A (en) 1969-05-07
DE1635143A1 (de) 1971-06-09
NO120457B (enrdf_load_html_response) 1970-10-19

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