EP0647284B2 - Method and apparatus for heat-treatment of a fiber product - nozzles are elongated in machine direction - Google Patents

Method and apparatus for heat-treatment of a fiber product - nozzles are elongated in machine direction Download PDF

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Publication number
EP0647284B2
EP0647284B2 EP93909819A EP93909819A EP0647284B2 EP 0647284 B2 EP0647284 B2 EP 0647284B2 EP 93909819 A EP93909819 A EP 93909819A EP 93909819 A EP93909819 A EP 93909819A EP 0647284 B2 EP0647284 B2 EP 0647284B2
Authority
EP
European Patent Office
Prior art keywords
gas
web
zones
fibre
gas inlet
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
EP93909819A
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German (de)
English (en)
French (fr)
Other versions
EP0647284A1 (en
EP0647284B1 (en
Inventor
Aron Per Hoegenhaven
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.)
Rockwool AS
Original Assignee
Rockwool International AS
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
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Application filed by Rockwool International AS filed Critical Rockwool International AS
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Publication of EP0647284B2 publication Critical patent/EP0647284B2/en
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Classifications

    • 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
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B19/00—Treatment of textile materials by liquids, gases or vapours, not provided for in groups D06B1/00 - D06B17/00
    • D06B19/0005—Fixing of chemicals, e.g. dyestuffs, on textile materials
    • D06B19/0047—Fixing of chemicals, e.g. dyestuffs, on textile materials by air steam
    • D06B19/0052—Fixing of chemicals, e.g. dyestuffs, on textile materials by air steam the textile material passing through a chamber
    • 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
    • D06C7/00—Heating or cooling textile fabrics

Definitions

  • the invention relates-to a method of thermally treating a moving mineral fibre web wherein oppositely directed gas streams are introduced into the fibre web from opposite sides thereof through inlet zones and wherein the gas streams thus introduced are released from the same side as they are introduced through outlet zones.
  • DK patent application No. 2558/78 discloses a curing oven comprising means for passing a hot gas stream through a mineral fibre web arranged between two gas permeable conveyor belts in a direction perpendicular to the web plane.
  • Such compressions may easily result in the formation of an uncontrollable amount of cavities in the fibre web imparting thereto an unacceptable appearance and an uneven insulating capacity.
  • the invention is based on the discovery that; as a consequence of the exceptionally large surface area of the mineral fibres, typically 500 m 2 /kg, an almost instantaneous change of the mineral fibre temperature occurs when the fibre web is exposed to the influence of hot or cold gas streams. Therefore, there is no need to force such gas streams to remain within the fibre web for a long period. Contrary to the teachings of DE publication No. A 22753 it has been shown that the gases may be allowed to escape immediately after their contact with the mineral fibres. This means that the travelling distance to be overcome by the gases in the mineral fibre web may be made short and that the gases may be introduced under a high pressure without ensuing compression of the fibres.
  • gas and gases as used herein mean that they comprise any hot gaseous medium including water vapour.
  • the method according to the invention is particularly suitable for curing the binder of a mineral fibre product containing an uncured thermocuring binder and in the following it will be explained more in detail in connection with a curing process wherein hot gases are used to effect curing of a thermocuring binder.
  • the method is also suitable for other thermal treatments, including cooling, of a mineral fibre product by introducing hot or cold gases into the mineral fibre product.
  • Fig. 1 is a sectional view of a mineral fibre web 1 which is moved by two gas permeable conveyor belts 4 in a plane perpendicular to the paper plane.
  • air inlet zones 2 which are elongated and extend in the direction of movement of the fibre web 1 hot gas streams are introduced, which gas streams, following deflection so as to move parallel with the web plane, are once again deflected so as to move out of the fibre web 1 through the outlet zones 3 located adjacent to the air inlet ducts 2.
  • a flow pattern such as the one shown in the drawing allows for an increase in the curing capacity of from 2 to 3 times compared to curing by means of hot gas streams which are passed transversally through the fibre web.
  • the gas inlet zones and the adjacent gas outlet zones may be elongated.
  • the zone into which hot gas is introduced from the one side of the fibre web is located just opposite the zone into which gas is introduced from the opposite side, but the two zones may be positioned slightly displaced relative to each other.
  • the opposite zones should not necessarily be of the same size. Usually, however, at least 25% of the area of the smallest zone should be overlapped by the opposite zone.
  • the pressure difference between the gas inlet zone and the adjacent gas outlet zone(s) may be provided in different manners. However, it is preferred to use a pressure which exceeds the atmospheric pressure in the gas inlet zone and atmospheric or subatmospheric pressure in the gas outlet zone(s).
  • the widths of said zones are preferably larger than or equal to the widths of the adjacent gas outlet zones.
  • the elongated gas inlet zones are preferably divided in the longitudinal direction to form separate sections and different pressures may be maintained in adjacent sections.
  • the increased curing capacity mentioned above is not conditioned by the entire curing operation being carried out as described above.
  • the increase in the curing capacity may be obtained by such modifications of portions of existing curing ovens, e.g. 20-90% and particularly preferred the first half thereof, that the curing therein is carried out by the method according to the invention.
  • the first portion of the curing operation may be effected by heat conduction, viz, by supplying heat to the gas permeable belts which are usually used to move mineral fibre webs through a curing oven, so as to form thin cured surface layers by contact of the belts with the fibre web surfaces.
  • heat conduction viz, by supplying heat to the gas permeable belts which are usually used to move mineral fibre webs through a curing oven, so as to form thin cured surface layers by contact of the belts with the fibre web surfaces.
  • the mineral fibre web is preferably maintained between two gas permeable belts, such as lamella belts, while it is treated with the gas streams supplied at the opposite sides.
  • mineral fibres as used herein comprises inorganic fibres produced from minerals. Examples of such fibres are rock wool fibres, glass wool fibres and slag fibres.
  • the method according to the invention is suitable for thermal treatment of mineral fibre webs having densities which are comprised within wide ranges, but it is particularly suitable for the treatment of light products of e.g. mineral fibre webs having a density of down to 7 kg/m 3 , but preferably a density of 15-60 kg/m 3 .
  • the fibre webs may be composed of one or more fibre layers.
  • FI-B-80102 discloses a method for drying a fibre web wherein a fibre web arranged between two air tight heat conductive belts is heated by heat supply to the belts.
  • GB patent No. 867530 discloses an apparatus for drying a textile fibre web wherein the fibre web is kept freely suspended in a drying zone wherein hot air is blown against the fibre web sides through slotted nozzles located on opposite sides of the fibre web.
  • the invention further relates to an apparatus for carrying out the method described above.
  • the apparatus comprises the features of Claim 11.
  • each gas outlet duct is preferably connected to one or more gas inlet openings through a conduit wherein a gas pump and optionally heating means are provided.
  • This embodiment permits the gas flowing out of the fibre product to be recycled optionally following renewed heating and to be reintroduced into the fibre product, thereby minimising the heat loss.
  • the method and the apparatus according to the invention is particularly suitable for use for curing a continuous binder-containing mineral fibre web, but it may also be used for curing a series of successively moved separate mineral fibre elements. They may also be used for the curing of binder-containing separate elements or stacks thereof.
  • the apparatus according to Figs. 2 and 3 comprises an upper endless gas permeable belt 10 and a lower endless gas permeable belt 12, which may serve to move a mineral fibre web 14 through a curing chamber 16.
  • the apparatus further comprises an inlet duct 18 for the supply of hot gas.
  • the duct 18 divides into an upper branch duct 20 and a lower branch duct 22.
  • the upper branch duct 20 is connected to an upper gas inlet zone which is divided into sections 24 by longitudinal gas outlet ducts 26 which are open at the ends.
  • the lower branch duct 22 is connnected to a lower gas inlet zone which is divided into sections 28 by longitudinal gas outlet ducts 30 which are open at the ends.
  • the gas outlet ducts 24 and 30 are connected to gas collecting zones 32 and 34 which, through communication ducts 36 and 38, respectively, are in communication with an outlet duct 40.
  • the outlet duct 40 is connected to a reheating apparatus 42 comprising a burner 43, which may be used for reheating the gas passed out of the curing chamber 16.
  • a reheating apparatus 42 comprising a burner 43, which may be used for reheating the gas passed out of the curing chamber 16.
  • the supply of gas to the apparatus 42 and the supply of hot gas to the inlet duct 18 is effected by means of a centrifugal blower 44.
  • the apparatus disclosed operates as follows:
  • Hot gas from the reheating apparatus 42 is blown through the duct 18 by means of the blowers 44 and on through the branch ducts 20 and 22 to the sections 24 and 28, respectively. From here the hot gas passes through the belts 10 and 12 into the mineral fibre web 14 and from here into the adjacent gas outlet ducts 26 and 30 while forming a gas flow pattern corresponding to the one shown in Fig. 1. From the ducts 26 and 30 the gas passes to the gas collecting zones 32 and 34 and on through communication ducts 36 and 38, respectively, into the outlet duct 40 and back to the apparatus 42.
  • the hot gas leaves the mineral fibre web 14 immediately following its introduction.
  • the apparatus permits efficient heat treatment of the mineral fibre web 14 without the ensuing risk of recess formation in the fibre web surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Inorganic Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
EP93909819A 1992-05-08 1993-05-10 Method and apparatus for heat-treatment of a fiber product - nozzles are elongated in machine direction Expired - Lifetime EP0647284B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DK606/92 1992-05-08
DK92606A DK60692D0 (da) 1992-05-08 1992-05-08 Fremstilling af et mineralfiberprodukt
DK60692 1992-05-08
PCT/DK1993/000154 WO1993023599A1 (en) 1992-05-08 1993-05-10 Method and apparatus for heat-treatment of a fiber product - nozzles are elongated in machine direction

Publications (3)

Publication Number Publication Date
EP0647284A1 EP0647284A1 (en) 1995-04-12
EP0647284B1 EP0647284B1 (en) 1997-01-29
EP0647284B2 true EP0647284B2 (en) 2000-08-30

Family

ID=8095480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93909819A Expired - Lifetime EP0647284B2 (en) 1992-05-08 1993-05-10 Method and apparatus for heat-treatment of a fiber product - nozzles are elongated in machine direction

Country Status (9)

Country Link
EP (1) EP0647284B2 (cs)
AT (1) ATE148509T1 (cs)
AU (1) AU4061093A (cs)
CZ (1) CZ274094A3 (cs)
DE (1) DE69307886T3 (cs)
DK (1) DK60692D0 (cs)
NO (1) NO302666B1 (cs)
SK (1) SK134394A3 (cs)
WO (1) WO1993023599A1 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060057351A1 (en) † 2004-09-10 2006-03-16 Alain Yang Method for curing a binder on insulation fibers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828282C (de) † 1949-12-11 1952-01-17 Hermann Haas Jun Dipl Ing Verfahren und Vorrichtung zum OEffnen eines nassen Faservlieses, insbesondere aus Zellwolle, waehrend der Trocknung
DE1729273A1 (de) † 1968-03-09 1971-06-09 Artos Meier Windhorst Kg Trockner

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB867530A (en) * 1956-12-15 1961-05-10 August Meier Windhorst Improvements relating to the drying or heat-treatment of web materials
FR1398809A (fr) * 1964-03-17 1965-05-14 Ameliorair Sa Séchoir pour produit en feuille soutenu par de l'air
US4170075A (en) * 1978-03-03 1979-10-09 Proctor & Schwartz, Inc. Nozzle for web processing apparatus
DE3144923A1 (de) * 1981-11-12 1983-05-19 Babcock Textilmaschinen GmbH, 2105 Seevetal Verfahren und anordnung zur waermebehandlung von laufenden warenbahnen
FI80102C (fi) * 1988-07-01 1990-04-10 Tampella Oy Ab Foerfarande och anordning foer torkning av en fiberbana.
DE3831496C2 (de) * 1988-09-16 2001-03-22 Fleissner Maschf Gmbh Co Verfahren zum thermischen Verfestigen von Vliesen mit Bindepulver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828282C (de) † 1949-12-11 1952-01-17 Hermann Haas Jun Dipl Ing Verfahren und Vorrichtung zum OEffnen eines nassen Faservlieses, insbesondere aus Zellwolle, waehrend der Trocknung
DE1729273A1 (de) † 1968-03-09 1971-06-09 Artos Meier Windhorst Kg Trockner

Also Published As

Publication number Publication date
EP0647284A1 (en) 1995-04-12
DE69307886D1 (de) 1997-03-13
NO944226L (no) 1994-11-04
NO944226D0 (no) 1994-11-04
SK134394A3 (en) 1995-10-11
NO302666B1 (no) 1998-04-06
DE69307886T2 (de) 1997-07-31
AU4061093A (en) 1993-12-13
DK60692D0 (da) 1992-05-08
ATE148509T1 (de) 1997-02-15
CZ274094A3 (en) 1995-03-15
EP0647284B1 (en) 1997-01-29
DE69307886T3 (de) 2001-03-29
WO1993023599A1 (en) 1993-11-25

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