EP0965806A2 - Procédé et dispositif de séchage d'une étoffe textile - Google Patents

Procédé et dispositif de séchage d'une étoffe textile Download PDF

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Publication number
EP0965806A2
EP0965806A2 EP99304683A EP99304683A EP0965806A2 EP 0965806 A2 EP0965806 A2 EP 0965806A2 EP 99304683 A EP99304683 A EP 99304683A EP 99304683 A EP99304683 A EP 99304683A EP 0965806 A2 EP0965806 A2 EP 0965806A2
Authority
EP
European Patent Office
Prior art keywords
fabric
drying
emitters
temperature
emitter
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.)
Withdrawn
Application number
EP99304683A
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German (de)
English (en)
Other versions
EP0965806A3 (fr
Inventor
Peter Thomas Johnson
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.)
Hopi Anstalt
Original Assignee
Hopi Anstalt
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
Application filed by Hopi Anstalt filed Critical Hopi Anstalt
Publication of EP0965806A2 publication Critical patent/EP0965806A2/fr
Publication of EP0965806A3 publication Critical patent/EP0965806A3/fr
Withdrawn legal-status Critical Current

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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
    • F26B13/12—Controlling movement, tension or position of material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases

Definitions

  • the present invention relates to a method and apparatus for drying a textile fabric.
  • infra red energy for textile drying is well known.
  • gas-fired and electric infra red emitters have been used to part-dry textile fabrics.
  • Such dryers operate at high temperatures and require careful control since there is a constant risk of scorching or burning the fabric that is being dried.
  • infra red dryers have traditionally been supplemented by conventional hot air dryers which operate at much lower temperatures so that the fabric is only partially dried by the infra red dryers before the fabric is then fully dried by the hot air dryers.
  • Hot air dyers are controlled by monitoring the surface temperature and/or the moisture content of the fabric being dried.
  • moisture measurement systems When drying using infra red energy it has been found that the surface temperature of different fabrics varied by up to 30°C for a given residual moisture content.
  • Existing moisture measurement systems cannot accurately measure the moisture content of different fabrics without being preprogrammed with information relating to fibre content. Consequently in order to obtain meaningful information from the measurements it is necessary to know the exact fibre type and content of the fabric to be dried as it enters the drying machine. In cases of mixed fabrics the precise fibre content is often not known making accurate moisture measurement impossible.
  • current infra red drying apparatus it is not possible to dry different fabrics entering the machine continuously one after the other to a desired residual moisture content without the risk of scorching or burning them.
  • a method for drying a textile fabric comprising the steps of:
  • the above method allows the drying of fabrics of different types in sequence to the desired residual moisture content without risk of burning or scorching, and without knowing the fabric composition.
  • the frequency of emission of the gas emitter is preferably between 2.7 and 3.2 microns.
  • apparatus for drying a textile fabric comprising a conveyor for conveying the fabric through a drying zone to dry the fabric to a desired residual moisture content, a plurality of gas fired infra red emitters spaced along the drying zone, at least one temperature transducer disposed after one or more of the emitters and for measuring the surface temperature of the fabric, means for monitoring the speed of the conveyor, a diffused laser for measuring the amount of steam given off by the fabric in the drying zone, a controller for calculating the heat energy required to achieve the desired residual moisture content and for selectively switching each emitter on or off and/or varying the speed of the conveyor in order to ensure the calculated heat energy is imparted to the fabric by the emitters.
  • the diffused laser comprises a transmitter at one end of the drying zone and a receiver at the other, the laser beam being configured to pass above the surface of the fabric.
  • the surface temperature transducer is preferably a pyrometer that is shielded from direct radiation from the emitters. Alternatively it may be a compensated pyrometer.
  • a method of drying and heat setting a textile fabric comprising the steps of:
  • apparatus for drying and heat setting a textile fabric comprising: a conveyor for conveying the textile fabric through a drying zone and a heat setting zone, the drying zone comprising a succession of spaced gas fired infra-red emitters to dry the fabric and raise it to a first predetermined temperature and means for measuring the surface temperature of the fabric after one or more of the gas fired infra red emitters, the heat setting zone comprising at least one modulated electric short wave infra red emitter to raise the temperature of the fabric and means for measuring the surface temperature of the fabric after it passes the short wave emitter; means for monitoring the speed at which the fabric is conveyed, a controller for calculating the heat energy required to achieve the first predetermined temperature of the fabric, for selectively switching each emitter on or off and/or varying the speed of the conveyor in order to ensure the calculated heat energy is imparted to the fabric, and for modulating the short wave emitter to ensure the temperature of the fabric is at a second predetermined value at an exit of the
  • the means for measuring the surface temperature is preferably a shielded or compensated pyrometer.
  • the textile fabric 1 to be dried is conveyed between parallel endless stenter chains 2.
  • the fabric 1 is gripped along each side edge by clips or pins (not shown) provided on the chain 2 so that it is conveyed through a drying zone 3 from entry to exit areas 4,5.
  • each gas emitter 6 typically has a running temperature of 850°C and heats up or cools down rapidly after being switched on or off.
  • a commercially available emitter is supplied by Stordy Combustion Engineering Limited. Such an emitter cools from the running temperature within two seconds and heats up from switch on to approaching running temperature within four seconds and to full running temperature within 10 seconds.
  • the emitters 6 direct the infra red rays downwards toward the conveyed fabric 1 which overlies an infra red reflective board 7 that is disposed under the area enclosed by the stenter chain 2.
  • the gas emitters 6 are interspersed by non-contact infra red pyrometers 8 that are positioned on alternate sides of the gas emitters 6 along the length of the drying zone 3. Each pyrometer 8 is screened from the radiation of the emitters 6 to prevent inaccurate temperature readings. Alternatively a compensated pyrometer is used which is programmed with information relating to the type and location of the emitters and other information so that stray readings are not considered.
  • a heat setting zone 9 Downstream of the drying zone 3 there is a heat setting zone 9 in which there are two short wave electric infra red emitters 10 positioned one after the other above the conveyed fabric 1, followed immediately by a compensated infra red pyrometer 11.
  • the heat setting zone raises the temperature of the fabric 1 to a desired value after it has been dried in the drying zone 3.
  • a diffused laser beam is transmitted just above the surface of the fabric from a laser transmitter 12 in the entry area to a laser receiver 13 in the exit area of the drying zone.
  • the pyrometer temperature readings are transmitted to a central controller that incorporates a processor and which controls the operation of the emitters and the speed of the stenter chains (and therefore the speed of passage of the fabric through the drying and heat setting zones).
  • the frequency of the gas fired emitters is tuned to between 2.7 and 3.2 microns which is the most efficient frequency for the evaporation of water.
  • the controller does not modulate the emitter frequency but simply switches the individual emitters on or off as desired.
  • the electric emitters heat set the fabric to a temperature of typically 180°C. Electric short wave emitters are more efficient in penetrating the fabric to raise its temperature evenly to the required temperature once all the moisture has been evaporated and can be modulated efficiently.
  • the surface temperature of the fabric is measured by the respective pyrometer and the reading is passed to the controller.
  • the absolute temperature measured by the pyrometer is not used to control the drying operation as different fabrics will have different temperatures at each stage but the pyrometers will immediately identify a change in temperature due to a different fabric.
  • a rapid rise or fall in the reading of the first pyrometer in the dying zone will alert the controller to a change in fabric and if this is confirmed by the reading of the next pyrometer the controller switches on or off the last emitter or last few emitters depending on the magnitude of change in the pyrometer readings.
  • This arrangement provides for an "early warning" and prevents dramatic final temperature variations. The risk of the fabric emerging from the drying zone in a scorched, burned or over-damp state is therefore reduced significantly.
  • the controller which adjusts the speed of the stenter chain conveyor to give the required residual moisture content.
  • the controller calculates the optimal number of switched on emitters that are required to dry the particular fabric to the desired residual moisture at the maximum speed of the conveyor and switches on the emitters accordingly.
  • the apparatus of the present invention thus balances the energy emitted with that required by the fabric so that the fabric is not over-dried. This is in contrast to a conventional hot air dryer where the fabric can be subjected to any amount of excess energy without damage and therefore can often be over-dried.
  • the diffused laser beam is not used.
  • the gas emitters are simply used to raise the temperature of the fabric towards the required heat setting temperature, for example to 160°C.
  • the dried fabric leaves the drying zone and then enters the heat set zone where it passes under the short wave electric emitters which bring the temperature of the fabric up to the required heat setting temperature (e.g. 180°C).
  • the compensated infra red pyrometer readings are fed to the controller which modulates the output of the emitters to maintain the fabric temperature at the required heat setting value.
  • the heat-setting zone is used optionally. To dry a fabric to a predetermined residual moisture content the fabric is only heated in the drying zone.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
EP99304683A 1998-06-17 1999-06-16 Procédé et dispositif de séchage d'une étoffe textile Withdrawn EP0965806A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9812947.1A GB9812947D0 (en) 1998-06-17 1998-06-17 Method and apparatus for drying a textile fabric
GB9812947 1998-06-17

Publications (2)

Publication Number Publication Date
EP0965806A2 true EP0965806A2 (fr) 1999-12-22
EP0965806A3 EP0965806A3 (fr) 2001-05-09

Family

ID=10833836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99304683A Withdrawn EP0965806A3 (fr) 1998-06-17 1999-06-16 Procédé et dispositif de séchage d'une étoffe textile

Country Status (2)

Country Link
EP (1) EP0965806A3 (fr)
GB (1) GB9812947D0 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003029546A1 (fr) * 2001-09-28 2003-04-10 Devendra Somabhai Naik Rameuse
CN102321925A (zh) * 2011-08-09 2012-01-18 浙江理工大学 一种复摇生丝红外干燥的控制设备及专用方法
EP2418316A1 (fr) * 2010-08-11 2012-02-15 BurnusHychem GmbH Procédé de séchage avec rayonnement infrarouge et dispositif d'exécution du procédé
US9238887B2 (en) 2010-07-23 2016-01-19 Mabe, S.A. De C.V. Drying method and profile
CN109654873A (zh) * 2018-12-29 2019-04-19 上海兰宝传感科技股份有限公司 含水率控制方法
CN115035503A (zh) * 2022-06-01 2022-09-09 浙江衣拿智能科技股份有限公司 一种烘干运载系统的控制方法、装置及电子设备
CN115200344A (zh) * 2022-07-25 2022-10-18 德意佳机械江苏有限公司 一种气流染色机的顶风机内置蒸发烘干装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078587A (en) * 1959-01-29 1963-02-26 William F Huck Coordinated heater and speed control for web drying machines
US3254422A (en) * 1962-07-10 1966-06-07 Du Pont Process of drying polychloroprene sheets
US3406954A (en) * 1966-07-06 1968-10-22 Fostoria Fannon Inc Apparatus for web drying
NL8001944A (nl) * 1980-04-02 1981-11-02 Vries Jacob De Inrichting voor het verwarmen van een vel- of baanvormig materiaal.
US4498864A (en) * 1982-12-10 1985-02-12 Techmark Corporation Method and apparatus for uniformly drying moving webs
DE3438859A1 (de) * 1983-12-30 1985-07-11 VEB Forschung und Entwicklung Betrieb des VEB Kombinat Wolle und Seide, DDR 6600 Greiz Verfahren und anordnung zur optimierung thermischer behandlungsprozesse von flaechengebilden
DE3710202A1 (de) * 1987-03-27 1988-10-06 Brueckner Trockentechnik Gmbh Regelverfahren zum betrieb einer spannmaschine fuer eine waermebehandlung von textilen warenbahnen

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003029546A1 (fr) * 2001-09-28 2003-04-10 Devendra Somabhai Naik Rameuse
US9238887B2 (en) 2010-07-23 2016-01-19 Mabe, S.A. De C.V. Drying method and profile
EP2418316A1 (fr) * 2010-08-11 2012-02-15 BurnusHychem GmbH Procédé de séchage avec rayonnement infrarouge et dispositif d'exécution du procédé
CN102321925A (zh) * 2011-08-09 2012-01-18 浙江理工大学 一种复摇生丝红外干燥的控制设备及专用方法
CN109654873A (zh) * 2018-12-29 2019-04-19 上海兰宝传感科技股份有限公司 含水率控制方法
CN115035503A (zh) * 2022-06-01 2022-09-09 浙江衣拿智能科技股份有限公司 一种烘干运载系统的控制方法、装置及电子设备
CN115200344A (zh) * 2022-07-25 2022-10-18 德意佳机械江苏有限公司 一种气流染色机的顶风机内置蒸发烘干装置

Also Published As

Publication number Publication date
GB9812947D0 (en) 1998-08-12
EP0965806A3 (fr) 2001-05-09

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