EP3358061B1 - Four pour le secteur textile - Google Patents

Four pour le secteur textile Download PDF

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Publication number
EP3358061B1
EP3358061B1 EP17154537.9A EP17154537A EP3358061B1 EP 3358061 B1 EP3358061 B1 EP 3358061B1 EP 17154537 A EP17154537 A EP 17154537A EP 3358061 B1 EP3358061 B1 EP 3358061B1
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EP
European Patent Office
Prior art keywords
oven
air
ventilation
fibres
wall
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.)
Active
Application number
EP17154537.9A
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German (de)
English (en)
Other versions
EP3358061A1 (fr
Inventor
Stefano Zanardi
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.)
Societa Italiana Costruzione Aeromeccaniche SICAM SRL
Original Assignee
Societa Italiana Costruzione Aeromeccaniche SICAM SRL
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Application filed by Societa Italiana Costruzione Aeromeccaniche SICAM SRL filed Critical Societa Italiana Costruzione Aeromeccaniche SICAM SRL
Priority to EP17154537.9A priority Critical patent/EP3358061B1/fr
Publication of EP3358061A1 publication Critical patent/EP3358061A1/fr
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Classifications

    • 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 present invention relates to an oven for the textile sector, to be used especially for the production of non-woven fabric.
  • the textile sector is one of the oldest industries in the history of technology, with processing based on the weaving of fibres.
  • non-woven fabric is a textile material obtained with procedures different from the classic weaving (which involve a weft and a warp) or knitting methods.
  • the textile fibres are oriented in an orderly arrangement, while in the non-woven fabric, fibres are arranged randomly and statistically.
  • the non-woven fabric can be obtained by processing natural or synthetic fibres.
  • non-woven fabrics include waterproofness, resistance to low and high temperatures, non-abrasiveness. These features make the non-woven fabrics suitable for several applications, in various technical fields.
  • they can be used to coat or set up ceilings and false ceilings and in the production of the so-called geotextile materials, used for the construction of roads, airports, tunnels, embankments and the like.
  • geotextile materials used for the construction of roads, airports, tunnels, embankments and the like.
  • they are used for the production of wallpapers, sofas, armchairs, chairs, furniture accessories.
  • white coats and other sterile surgical drapes In the medical industry, they are used for the production of white coats and other sterile surgical drapes. They are also used for the production of disposable caps and overshoes for swimming pools.
  • non-woven fabric such as bags, shopping bags and more.
  • In agriculture they are used for cloth for the protection of the plants, for the collection and the protection of fruit and vegetables, for the development of seeds, for greenhouse cultivations, to prevent the growth of weeds, to protect the more delicate plants from weather, animals and pests.
  • In clothing they are used to line shoes and shoulder pads of suits.
  • In manufacturing they are used for packaging and for the production of filtres.
  • In photography they may be excellent materials for backdrops. They are also used to improve the grounds for show jumping tracks in horse riding.
  • the non-woven fabric can be composed of natural and/or synthetic fibres. Normally, it is produced by means of carding machines.
  • the types of traditional cards are those linked to a web laying machine, or it is possible to use airlays.
  • the non-woven fabric produced by these machines is totally devoid of mechanical consistency.
  • a common way to confer consistency to these materials is to mix the fibres with low melting fibres which, by melting, bind to other fibres, thus creating a robust and mechanically stable structure. Once the low melting fibres are mixed to the other fibres, they are molten, placing the material in an oven where a hot air flow passes through the material.
  • low-melting-point fibres it is possible to mention, for example, polypropylene and polyester, although there are many other fibres available for this use.
  • This hot air flow is created by means of fans and burners, generally placed on the inner face of one of the longitudinal walls of the oven.
  • the traditional ovens currently used for these operations are realised as parallelepiped blocks, with feed on the front faces for entrance and exit of a conveyor belt, in order to insert and extract the material before and after the operation.
  • the air flow must be periodically reversed during the movement of the material from entrance to exit.
  • gate valves are normally arranged inside the traditional oven, in order to program the direction sequence of the air flow according to the change of the characteristics of the different materials to be treated.
  • the longitudinal sides of these traditional ovens are therefore normally blind, except for small inspection openings, also configured as windows protected by glass.
  • the gate valve assemblies of these traditional ovens have bulky side size (1,5 - 2 m) with respect to the useful width of the oven itself, sometimes causing their installation to be difficult and occupying in an oven with useful width of 2 m an excess of 100% with respect to the space actually needed for the passage of the material.
  • the air passing treatment of the fibres entails that a part of the fibres comes out of the layer of non-woven fabric in formation and deposits on the oven parts, making it dirty. It is therefore necessary to remove some parts of the oven to extract from it the dirty parts and clean them.
  • the inner parts of the oven not being accessible except for the extent allowed by the inspection opening, it is necessary to perform long and difficult cleaning operations. This makes the downtime due to cleaning operations of the parts of the oven relatively long, remarkably affecting productivity.
  • the side arrangement of the fans makes the even air distribution on the side size of the oven difficult, a problem which is greatly amplified by increasing the working width over 3 m.
  • the German utility model No. 203 15 984 discloses a textile machine, in particular an oven for the textile sector, for the continuous treatment of a fabric ribbon.
  • the ventilation of the represented oven although fans are mounted in the upper part of the oven, conveys the air flows on only one of the two length sides of the oven. Indeed, the opposite side to the ventilation side is provided with shear gates and glass windows, adapted for the observation of the fabric inside the oven.
  • CN201476496U discloses an energy-saving discharge reduction electric oven for a textile fabric drying device.
  • Such an electric oven comprises an oven frame, a circulating fan, a circulating upper air channel, a circulating lower air channel, a circulating air outlet channel, heating pipe clamps, medium wave infrared radiation heating pipes, an upper conduction band roller, a lower conduction band roller, a bearing, needle plate chain guiding rails or net belts, a speed reduction electromotor, a roller supporting beam and an air discharge port filter plate.
  • a plurality of groups of heating pipe clamps are installed in the oven frame, a plurality of medium wave infrared radiation heating pipes are respectively installed on a plurality of groups of heating pipe clamps, the needle plate chain guiding rails or the net belts are installed on an active roller, a driven roller, the upper conduction band roller and the lower conduction band roller, the speed reduction electromotor is installed on one end on the lower portion of the oven frame, an output shaft of the speed reduction electromotor is directly connected with the active roller, the circulating upper air channel is installed on the upper portion of the oven frame, the circulating lower air channel is installed on the lower portion of the upper conduction band roller, the circulating fan is installed on the top of the oven frame, and an air inlet end port of the circulating fan is communicated with the circulating air outlet channel on the top of the oven frame.
  • the problem underlying the present invention is to propose an oven structure for the textile sector, which overcomes the above mentioned drawbacks and allows to realise the inversion of the ventilation, with the possibility to access the inner part of the oven itself to clean and maintain it, having at the same time a reduced footprint, compared to that of conventional ovens.
  • an oven for the textile sector substantially parallelepiped in shape and comprising means for ventilation with hot air
  • said means for ventilation are provided on the ceiling of the oven itself and the side walls of said oven, being free from valves, fans and burners, are adapted to be fully opened, pivoting on specific hinges, characterised in that between the outer side doors and the inner side wall of said oven an air gap is present, adapted to alllow the passage of process air to and fro through the material and in that the valves for the operation of this system are mounted with a minimum fooprint on the same inner doors of the oven.
  • Subclaims describe preferred features of the invention.
  • the oven 1 comprises a workspace 2 including a support conveyor belt 3 and an opposite upper conveyor belt 4. Burners (not shown in the drawings) and fans 5 are provided for the production of hot air, and are arranged on the ceiling of the oven 1, preferably in a central position, to direct the heated air in the various areas of the oven 1.
  • the oven 1 is composed by a series of juxtaposed modules, the number of which is proportional to the productivity in kg/h of non-woven fabric to be obtained, each module having, preferably, a double burner and two fans.
  • Each of said modules comprises a pair of outer doors 6 and a side wall 7.
  • the wall 7 is adapted to be fully opened, pivoting on specific hinges (not shown for simplicity), to form two shutters 7A abutting in the centre, which are similar to two shutters of an inner door. Between the outer doors 6 and the wall 7 there is an air gap adapted to send and retrieve process air after it passes through the material.
  • the wall 7 has gates 8 on its surface, adapted to perform the inversion of the air flow.
  • fixed openings can be provided, since the double direction of ventilation is not necessary for certain materials. It is important not to confuse the inspection windows described in the German utility model No. 203 15 984 with the inversion gates disclosed in this application.
  • channelling elements 9 of the air flow realised as walls perpendicular to the wall 7: normally, said elements 9 can be rotated as well on specific hinges to allow the opening of the inner walls, without disassembling the panels 9 defining the air ducts.
  • the doors 6 also allow, with their closure, to lock in position the channelling elements 9 in the workspace 2.
  • the materials are deposited in the form of fibres on the work spare to obtain non-woven fabrics 10.
  • the bottom of the oven features ducts for the evacuation of the fumes, while process air is conveyed through independent channels, preferably eight, in pressure and depression.
  • the fibres to be used for the formation of non-woven fabric are introduced in the workspace 2 of the oven 1, by mixing the high-melting-point textile fibres, which may be natural fibres, such as cotton, wool, linen; or synthetic fibres, such as rayon, nylon, viscose and others, and low-melting-point fibres, for example (with no limitation thereto) polypropylene or polyesters.
  • the introduction into the oven 1 preferably takes place from the front, where there is a specific entrance with relevant conveyor belts.
  • the material is evenly distributed on the lower support conveyor belt 3. Burners and fans 5 are started. In this way, the hot air is directed on the whole surface of the material resting on the support conveyor belt 3.
  • the air gap between the doors 6 and the wall 7 and the channelling elements 9 serve for this purpose, conveying the air towards the whole workspace 2 of the oven 1 and retrieving it to let the cycle begin again.
  • the burner works keeping the temperature suitable for melting fibres, and the air directed by the fans 5, heated in this way, causes the melting of the low-melting-point fibres.
  • a preferred temperature range is between 80°C and 220°C, depending on the various types of low-melting-point fibres used. Once a type of fibre is chosen, it is advisable to set the suitable temperature, otherwise the melting of the low-melting-point fibres may not occur or may occur only incompletely. Above this temperature, fibre denaturation phenomena could occur.
  • the operation continues for the time necessary to completely melt the low-melting-point fibres, suitably adjusting the speed of the oven according to the length of the oven itself.
  • the material in the form of fibres always via conveyor belt, passes at this point to the next section, similar to the previous ones, but without burners or other heating bodies, for the cooling operation.
  • the fans 5 continue to direct air, now drawn cold from the outside, which gradually cools down the material, in order to obtain the complete resolidification of the molten material which acts, therefore, as a glue for the other fibres.
  • the material 10 comes out of from the oven 1, ready for the next processing steps.
  • the opening of the walls 7 on the two sides is such that two operators facing the opened walls 7 are able to see each other without any problem.
  • the present invention achieves a degree of safety which could not be even imagined before.
  • German utility model No. 203 15 984 exhibits a side ventilation on one side only, while the oven according to the present invention has side and symmetrical ventilation (i.e. on both sides in the length of the oven).
  • the present invention allows to obtain a perfectly even melting, due to a symmetric ventilation from the two sides of the oven where there are doors 6 and walls 7, extremely limited plan dimensions of the non-operative ventilation area of the oven (800 mm rather than 2000 mm wide), greater energy efficiency and productivity, the possibility to reverse air flows every 1000 mm length of the oven, the possibility to completely inspect the two sides of the oven, the possibility to extract from both sides all ventilation components for cleaning and maintenance purposes. Furthermore, thanks to the easy replacement of some components of the ventilation circuit, it is possible to use the same oven also for very different processes - for example, both for felts and battings - which is presently not possible.
  • a peculiarity of the present invention is to have an oven for fabrics and non-woven fabrics with ventilation ducts on both sides in the length of the oven and, moreover, with each side provided with power-operated air inversion gates.
  • the inner operating part of the oven, where the fabric passes and which needs frequent cleaning, would be totally inaccessible, because of the obstacle of the air ducts on both sides and of the relevant air inversion gates.
  • This new conception of the oven is now provided with outer and inner side doors, which determine the ventilation ducts of the oven itself.
  • the innovation according to the present invention consists in having the air ducts determined by the double doors and the inversion gates integral to the inner doors.
  • the ventilation sides totally blind in traditional ovens, make the inner and operating part of the oven, needing frequent cleaning, fully accessible only in the SICAM oven case, with ventilation on both sides and double doors that can be opened.
  • Ventilation is reversible, thanks to the specific gates mounted directly on the inner doors, which, integral to the doors themselves, allow full access inside the oven.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (10)

  1. Four (1) pour le secteur textile, sensiblement parallélépipédique et comprenant des moyens (5) de ventilation avec de l'air chaud, dans lequel lesdits moyens (5) de ventilation sont prévus au plafond du four (1) lui-même et sur des parois (7) latérales dudit four (1), étant exemptes de vannes, ventilateurs et de brûleurs, et sont adaptés pour être complètement ouverts, pivotant sur des charnières spécifiques, caractérisé en ce que, entre des portes extérieures (6) latérales et des parois (7) intérieures latérales dudit four (1), un entrefer est présent, adapté pour permettre le passage de l'air de traitement vers et en va-et-vient à travers un matériau (11), et en ce que des vannes pour le fonctionnement du four (1) sont montées avec un encombrement minimum sur les mêmes parois intérieures du four (1).
  2. Four (1) selon la revendication 1, caractérisé en ce que l'ouverture desdites parois (7) latérales se fait par pivotement sur des charnières.
  3. Four (1) selon la revendication 1 ou 2, caractérisé en ce que, sur la paroi (7) latérale ou sur la porte extérieure (6), se trouvent des éléments (9) de canalisation de l'écoulement d'air, réalisés comme parois perpendiculaires à la paroi (7).
  4. Four (1) selon la revendication 3, caractérisé en ce que lesdits éléments (9) pivotent si nécessaire sur des charnières appropriées pour permettre l'ouverture des parois intérieures.
  5. Four (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la paroi (7) a des grilles (8) sur sa surface, adaptées pour effectuer l'inversion de l'écoulement d'air.
  6. Four (1) selon la revendication 5, caractérisé en ce que ces grilles permettent une opération de cisaillement par contrepoids.
  7. Four (1) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la paroi (7) a des ouvertures fixes pour le passage de l'air sur sa surface.
  8. Four (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il existe des éléments diffuseurs qui peuvent être introduits dans ou extraits de l'espace de travail (2) du four (1) lui-même.
  9. Four (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est composé d'une série de modules juxtaposés, dont le nombre est proportionnel à la longueur du four à obtenir.
  10. Four (1) selon la revendication 9, caractérisé en ce que chaque module a un ou plusieurs brûleurs et un ou plusieurs ventilateurs.
EP17154537.9A 2017-02-03 2017-02-03 Four pour le secteur textile Active EP3358061B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17154537.9A EP3358061B1 (fr) 2017-02-03 2017-02-03 Four pour le secteur textile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17154537.9A EP3358061B1 (fr) 2017-02-03 2017-02-03 Four pour le secteur textile

Publications (2)

Publication Number Publication Date
EP3358061A1 EP3358061A1 (fr) 2018-08-08
EP3358061B1 true EP3358061B1 (fr) 2020-01-29

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EP17154537.9A Active EP3358061B1 (fr) 2017-02-03 2017-02-03 Four pour le secteur textile

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700039980A1 (it) * 2017-04-11 2018-10-11 Marco Gualtieri Modulo ed impianto per il trattamento di fibre per l'ottenimento di un tessuto non tessuto

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8711119U1 (de) * 1987-08-16 1987-10-01 Brückner Trockentechnik GmbH & Co KG, 7250 Leonberg Vorrichtung zur Wärmebehandlung einer kontinuierlich bewegten Warenbahn
DE20315984U1 (de) 2003-10-17 2003-12-11 A. Monforts Textilmaschinen Gmbh & Co. Kg Textilbehandlungsmaschine
CN201476496U (zh) * 2009-09-10 2010-05-19 李丹 节能减排电烘箱
IT1399339B1 (it) * 2010-03-29 2013-04-16 Unitech Textile Machinery Spa Struttura di eiezione di aria calda per forni di essiccazione di prodotti tessili.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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