EP0291396A1 - Drying apparatus using micro-waves for the edge of a running web, in particular a textile web - Google Patents

Drying apparatus using micro-waves for the edge of a running web, in particular a textile web Download PDF

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Publication number
EP0291396A1
EP0291396A1 EP88401107A EP88401107A EP0291396A1 EP 0291396 A1 EP0291396 A1 EP 0291396A1 EP 88401107 A EP88401107 A EP 88401107A EP 88401107 A EP88401107 A EP 88401107A EP 0291396 A1 EP0291396 A1 EP 0291396A1
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Prior art keywords
guide
edge
slot
generator
drying
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EP88401107A
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German (de)
French (fr)
Inventor
Bertrand Meyer
Alexandre Pijew
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Institut Textile de France
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Institut Textile de France
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Publication of EP0291396A1 publication Critical patent/EP0291396A1/en
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    • 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
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • 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
    • F26B13/007—Treating a particular portion of the web or plate, e.g. the edge

Definitions

  • the present invention relates to drying by electromagnetic radiation in the microwave range of an edge of a planar material, such as a fabric or a fabric, in continuous scrolling. It relates in particular to the pre-drying or post-drying of heterogeneous selvedge in addition to conventional drying.
  • Certain textile articles for example bed sheets, are made from fabrics having so-called tucked edges. These tucked edges are obtained by weaving by returning between the warp threads the free end of the weft thread along the selvedge; thus the selvedge is clean and the fabric no longer has to be cut later along the selvedge.
  • the edge of the fabric has an increased thickness and an increase in density in textile material. This local heterogeneity causes differences in behavior during the treatments undergone by the fabric and in particular during the drying of the fabric after impregnation and padding. In particular, it was noted that when leaving a drying train there remained a significant difference between the residual moisture level of the fabric itself and that of the selvedges.
  • This known device is not entirely suitable in the case of the drying of the edges of a planar material, in particular textile, because the drying is carried out locally along a given line defined by the ridge, while we are looking for a drying of the entire surface corresponding to the edge.
  • a device which has as its object the specific drying of an edge of a planar moving material, in particular a textile material, and which is particularly well suited for the pre-drying or post-drying of the edge of such a material in addition to a traditional drying installation, such as a paddle.
  • the device according to the invention implements microwave radiation coming from a generator and is composed of a microwave propagation guide, elongated and comprising a single slot allowing the passage of the planar material to inside the guide.
  • the microwave propagation guide is not ridged and it has two lips parallel to each other and to the plane of the material, protruding on either side throughout the single slot, and forming a guide to
  • the guide is closed at the end opposite the generator by a split short-circuit.
  • the wall of the guide opposite the single slot has different orifices connected to a suction system.
  • the microwave propagation guide is a rectangular guide connected by a bent part to the generator and the single slit is practiced substantially along the median axis of the large lateral face of the guide, contiguous to the external part of the elbow.
  • the electric field has a general direction which is perpendicular to the two large faces and a component which is maximum in the median plane of the guide; moreover, by examining the configuration of the current lines on the walls of the guide, it can be seen that none of these lines is cut by the plane passing through the middle of the two large faces of the guide. There will therefore theoretically be no disturbances as to the propagation of the wave.
  • the single slot is intended to allow the portion of the flat material located along the edge to pass, it is necessary to provide an opening of sufficient width.
  • the width of the slit must be at most equal to a third of the length of the long side of the straight section of the waveguide.
  • the holes made in the wall of the guide opposite the single slot advantageously give in a suction chamber which is itself connected to a single source of suction.
  • the single slit is practiced according to a generator facing a maximum field area, and the device is equipped with pins making it possible to block the field parallel to the planar material in the guide.
  • the waveguide 1 is supplied with microwaves by the generator 2.
  • the end part of the guide 1, opposite the generator, is closed by a short circuit 3.
  • the end part of the guide 1 corresponding to the supply of energy is terminated by a bend 4 at 90 ° with a flange of connection to the supply circuit comprising the generator 2.
  • This supply circuit comprises a wave propagation guide on which are mounted the members for adjusting the various operating parameters of the device and in particular an adaptation iris; these organs are well known to those skilled in the art and are not described further.
  • the bent part 4, the guide 1 and the short-circuit 3 are split longitudinally on the sections AB for the bent part 4, BC, all along the guide 1, and CD for the short-circuit.
  • This single slit is made along the median axis of the large corresponding face of the guide 1.
  • This slit with a width of 0.6 cm allows the introduction of the edge of the flat material along its edge inside the guide 1 in an area where the electric field is maximum.
  • the single slot is provided with two lips 5 parallel to each other and to the median plane, placed immediately on either side from the slot and outside the guide 1.
  • the two lips 5 have a total width of 5 centimeters; they have on their extreme part, that is to say on the last 1.5 cm, a widening with respect to the median plane passing through the slot of the order of 15 °.
  • This particular shape facilitates the introduction of the material between the two lips 5.
  • these lips form a cut guide, avoiding possible parasitic radiation due to the slit.
  • each orifice 6 has a substantially rectangular shape of variable length: the two extreme orifices are 13.5 centimeters in length and the other three orifices are 9 centimeters in length; their width is 1 centimeter. They are regularly distributed all along the rear face of the guide 1, and lead to the suction chamber 7.
  • This chamber 7 has the shape and functions as a suction hood; it sucks in through the circuit 8 and thanks to the vacuum cleaner 9 the water vapor, emitted during drying inside the guide 1, through the orifices 6.
  • the operation of the device is as follows.
  • the fabric 10 is a cotton fabric with a tucked edge 11.
  • the generator used has a power of 1200 watts.
  • the fabric 10 passes beforehand through a scarf where it is impregnated with a treatment bath and then expressed mechanically.
  • the humidity level of edge 11 is of the order of 86%.
  • the fabric 10 is introduced into the device of the invention described above so that the selvedge 11 enters the slot between the lips 5.
  • the fabric 10 is then positioned as illustrated on the figure.
  • the retracted edge 11 is inside the guide 1, in the maximum field area.
  • the device is placed on the path of the fabric between the outlet of the impregnation scarf and the actual entrance of the train.
  • the guide can be placed in a horizontal or vertical position.
  • the moisture content of the selvedge 11 after passing through the guide 1 has fallen to approximately 67%, ie an evaporation of the order of 20% of water relative to the weight of the edge.
  • this evaporation is around 11%, and at 40 meters per minute it is around 6%. This lowering of the moisture content of the edge is sufficient to, after passing through the train, obtain a regularly dried fabric over its entire width.
  • the vacuum cleaner 9 is on and all the water vapor produced inside the guide 1 under the action of the microwaves is sucked through the orifices 6 towards the chamber suction 7 from which it is extracted through the conduit 8.
  • the waveguide may have a circular shape, in the case of operation according to the TM01 mode.
  • it is not limited to textile materials, but can be applied to all flat materials used in continuous scrolling and having an edge which should preferably be dried over the rest of the material.
  • it can be applied not only to drying by evaporation of water but also to all edge treatments for which the action of microwaves is positive, for example fixing binders.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Electromagnetism (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

Le dispositif comprend un guide d'onde (1) préférentiellement rectangulaire dont une extrémité est terminée par un court-circuit (3) et l'autre par un coude (4) de raccordement au générateur (2). La partie extérieure du coude (AB), la face contigue du guide (BC) et le court-circuit (CD) sont fendus d'une fente unique, pratiquée selon le plan médian, par laquelle est introduite la lisière (11) du matériau (10) à l'intérieur du guide (1). La face du guide opposée à la fente comporte des orifices (6) reliés par l'intermédiaire d'une chambre (7) à une source d'aspiration (9).Deux lèvres (5) parallèles entre elles et au plan médian s'étendent de part et d'autre et tout le long de la fente ; leurs extrémités forment un léger évasement. Ces lèvres forment guide à la coupure et facilitent l'introduction de la lisière (11) dans le guide (1).The device comprises a preferentially rectangular waveguide (1), one end of which is terminated by a short-circuit (3) and the other by an elbow (4) for connection to the generator (2). The outer part of the elbow (AB), the contiguous face of the guide (BC) and the short-circuit (CD) are split with a single slot, made along the median plane, through which the edge (11) of the material is introduced. (10) inside the guide (1). The face of the guide opposite the slot has orifices (6) connected via a chamber (7) to a suction source (9) .Two lips (5) parallel to each other and to the median plane s' extend on either side and all along the slit; their ends form a slight flare. These lips form a guide to the cut and facilitate the introduction of the edge (11) into the guide (1).

Description

La présente invention concerne le séchage par rayonnement électromagnétique dans la gamme des micro-ondes d'une lisière d'un matériau plan, tel qu'un tissu ou une étoffe, en défilement continu. Elle concerne en particulier le préséchage ou le postséchage de lisière hétérogène en complément d'un séchage conventionnel.The present invention relates to drying by electromagnetic radiation in the microwave range of an edge of a planar material, such as a fabric or a fabric, in continuous scrolling. It relates in particular to the pre-drying or post-drying of heterogeneous selvedge in addition to conventional drying.

Certains articles textiles, par exemple des draps de lit, sont confectionnés à partir de tissus présentant des lisières dites rentrées. Ces lisières rentrées sont obtenues au tissage en rentrant entre les fils de chaîne le bout libre du fil de trame le long de la lisière ; ainsi la lisière est franche et le tissu n'a plus à être coupé ultérieurement le long de la lisière. Cependant du fait du rentrage des fils de trame, la lisière du tissu présente une surépaisseur et une augmentation de densité en matière textile. Cette hétérogénéité locale provoque des différences de comportement lors des traitements subis par le tissu et notamment lors du séchage du tissu après imprégnation et foulardage. Il a en particulier été remarqué qu'au sortir d'une rame de séchage il subsistait un écart important entre le taux d'humidité résiduel du tissu lui-même et celui des lisières . Cet écart est d'ailleurs accentué lorsque le tissu est transporté dans la rame de séchage à l'aide d'un dispositif à pinces, qui saisissent le tissu le long des lisières à l'entrée de la rame et le maintiennent au large jusqu'à la sortie de celle-ci. La présence des pinces gêne l'évaporation de l'eau le long des lisières et ne permet pas un séchage du tissu selon un profil d'humidité transverse constant.Certain textile articles, for example bed sheets, are made from fabrics having so-called tucked edges. These tucked edges are obtained by weaving by returning between the warp threads the free end of the weft thread along the selvedge; thus the selvedge is clean and the fabric no longer has to be cut later along the selvedge. However, due to the retraction of the weft threads, the edge of the fabric has an increased thickness and an increase in density in textile material. This local heterogeneity causes differences in behavior during the treatments undergone by the fabric and in particular during the drying of the fabric after impregnation and padding. In particular, it was noted that when leaving a drying train there remained a significant difference between the residual moisture level of the fabric itself and that of the selvedges. This difference is further accentuated when the fabric is transported in the drying ream using a clamp device, which grips the fabric along the selvedges at the entrance of the ream and keeps it wide until at the exit of this one. The presence of the clamps hinders the evaporation of water along the edges and does not allow drying of the fabric according to a constant transverse humidity profile.

Les différences de taux d'humidité constatées entre les lisières et le reste du matériau plan , dues aux pinces de transport et/ou aux lisières rentrées, conduisent les utilisateurs de rame à sursécher l'ensemble du matériau pour obtenir un taux d'humidité acceptable sur les lisières . Cette pratique entraîne une surconsommation énergétique et une limitation des vitesses de production.The differences in humidity observed between the selvedges and the rest of the flat material, due to the transport clamps and / or the retracted selvedges, lead the users of the trains to overdry all of the material to obtain an acceptable humidity level. on the edges. This practice leads to overconsumption of energy and a limitation of the speed of production.

Dans le domaine du séchage à partir d'un rayonnement micro-onde, on connaît par le brevet anglais N° 1 211 789 un dispositif permettant de sécher une ligne de colle le long d'un bloc multifeuille de papier. Ce dispositif comporte un guide d'onde ridgé qui est allongé et fendu sur une de ses faces, et des moyens de guidage tels que le bord du bloc multifeuille de papier contenant la ligne de colle puisse être inséré dans le guide d'onde à travers la fente et que la ligne de colle soit positionnée dans la zone de concentration d'énergie réalisée par le ridge à l'intérieur du guide d'onde.In the field of drying from microwave radiation, there is known from English Patent No. 1,211,789 a device for drying a line of adhesive along a multi-sheet block of paper. This device comprises a ridged waveguide which is elongated and split on one of its faces, and guide means such that the edge of the multi-sheet block of paper containing the line of glue can be inserted into the waveguide through the slot and that the line of glue is positioned in the energy concentration zone produced by the ridge inside the waveguide.

Ce dispositif connu ne convient pas totalement dans le cas du séchage de lisières d'un matériau plan , notamment textile, du fait que le séchage est réalisé localement le long d'une ligne donnée définie par le ridge, alors que l'on recherche un séchage de toute la surface correspondant à la lisière.This known device is not entirely suitable in the case of the drying of the edges of a planar material, in particular textile, because the drying is carried out locally along a given line defined by the ridge, while we are looking for a drying of the entire surface corresponding to the edge.

Or on a trouvé et c'est ce qui fait l'objet de l'invention un dispositif qui a pour objet le séchage spécifique d'une lisière d'un matériau plan en défilement , notamment un matériau textile , et qui est particulièrement bien adapté pour le préséchage ou le postséchage de lisière d'un tel matériau en complément d'une installation traditionnelle de séchage, telle qu'une rame.Now we have found, and this is what is the subject of the invention, a device which has as its object the specific drying of an edge of a planar moving material, in particular a textile material, and which is particularly well suited for the pre-drying or post-drying of the edge of such a material in addition to a traditional drying installation, such as a paddle.

De manière connue, le dispositif selon l'invention met en oeuvre un rayonnement micro-onde provenant d'un générateur et est composé d'un guide de propagation des micro-ondes, allongé et comportant une fente unique permettant le passage du matériau plan à l'intérieur du guide. De manière caractéristique, le guide de propagation des micro-ondes n'est pas ridgé et il comporte deux lèvres parallèles entre elles et au plan du matériau, dépassant de part et d'autre tout au long de la fente unique, et formant guide à la coupure.Avantageusement , le guide est fermé à l'extrémité opposée au générateur par un court-circuit fendu.In known manner, the device according to the invention implements microwave radiation coming from a generator and is composed of a microwave propagation guide, elongated and comprising a single slot allowing the passage of the planar material to inside the guide. Typically, the microwave propagation guide is not ridged and it has two lips parallel to each other and to the plane of the material, protruding on either side throughout the single slot, and forming a guide to Advantageously, the guide is closed at the end opposite the generator by a split short-circuit.

De préférence la paroi du guide en regard de la fente unique comporte différents orifices reliés à un système d'aspiration.Preferably, the wall of the guide opposite the single slot has different orifices connected to a suction system.

Ainsi toute la lisière du matériau plan est parfaitement positionnée à l'intérieur du guide , pendant que ledit matériau défile continûment ; toute la partie latérale du matériau placée dans le guide et par conséquent la lisière, sont soumises à l'action des micro-ondes en vue d'être séchées ; la vapeur d'eau, émise lors du séchage de la partie latérale du matériau , est immédiatement captée à l'intérieur même du guide et évacuée par aspiration.Thus the entire selvedge of the planar material is perfectly positioned inside the guide, while said material continuously scrolls; all the lateral part of the material placed in the guide and consequently the selvedge are subjected to the action of microwaves in order to be dried; the water vapor, emitted during the drying of the lateral part of the material, is immediately captured inside the guide itself and evacuated by suction.

Préférentiellement le guide de propagation des micro-ondes est un guide rectangulaire relié par une partie coudée au générateur et la fente unique est pratiquée sensiblement le long de l'axe médian de la grande face latérale du guide , contigue à la partie extérieure du coude. Dans ce type de guide d'onde, fonctionnant selon le mode TE₀₁ , il est bien connu des spécialistes que le champ électrique a une direction générale qui est perpendiculaire aux deux grandes faces et une composante qui est maximale dans le plan médian du guide ; par ailleurs en examinant la configuration des lignes de courant sur les parois du guide, on constate qu'aucune de ces lignes n'est coupée par le plan passant par le milieu des deux grandes faces du guide. Il n'y aura donc théoriquement pas de perturbations quant à la propagation de l'onde. Etant donné que la fente unique est destinée à laisser passer la partie du matériau plan située le long de la lisière, il est nécessaire de prévoir une ouverture d'une largeur suffisante. Cependant pour minimiser les fuites, il faut que la largeur de la fente soit au plus égale au tiers de la longueur du grand côté de la section droite du guide d'onde.Preferably, the microwave propagation guide is a rectangular guide connected by a bent part to the generator and the single slit is practiced substantially along the median axis of the large lateral face of the guide, contiguous to the external part of the elbow. In this type of waveguide, operating in TE₀₁ mode, it is well known to specialists that the electric field has a general direction which is perpendicular to the two large faces and a component which is maximum in the median plane of the guide; moreover, by examining the configuration of the current lines on the walls of the guide, it can be seen that none of these lines is cut by the plane passing through the middle of the two large faces of the guide. There will therefore theoretically be no disturbances as to the propagation of the wave. Since the single slot is intended to allow the portion of the flat material located along the edge to pass, it is necessary to provide an opening of sufficient width. However, to minimize leaks, the width of the slit must be at most equal to a third of the length of the long side of the straight section of the waveguide.

D'autre part la présence des lèvres formant guide à la coupure limite les risques de fuites d'énergie.On the other hand the presence of the lips forming a guide at the cut limits the risks of energy leaks.

Les orifices pratiqués dans la paroi du guide en regard de la fente unique donnent avantageusement dans une chambre d'aspiration qui est elle-même reliée à une source unique d'aspiration.The holes made in the wall of the guide opposite the single slot advantageously give in a suction chamber which is itself connected to a single source of suction.

Dans le cas d'un guide d'onde circulaire, fonctionnant selon le mode TM₀₁, la fente unique est pratiquée selon une génératrice en regard d'une zone de champ maximum, et le dispositif est équipé de tétons permettant de bloquer le champ parallèlement au matériau plan dans le guide.In the case of a circular waveguide, operating according to the TM₀₁ mode, the single slit is practiced according to a generator facing a maximum field area, and the device is equipped with pins making it possible to block the field parallel to the planar material in the guide.

L'invention sera mieux comprise grâce à la description qui va suivre d'un mode de réalisation et du dessin annexé dans lequel la figure unique montre une vue schématique de dessus du dispositif comportant un guide d'onde rectangulaire.The invention will be better understood from the following description of an embodiment and the appended drawing in which the single figure shows a schematic top view of the device comprising a rectangular waveguide.

Le guide d'onde 1 est alimenté en micro-ondes par le générateur 2. La section droite du guide 1 a une forme rectangulaire avec un grand côté de longueur a et un petit côté de longueur b. Il fonctionne suivant le mode fondamental TE₀₁, et la longueur a est choisie en fonction de la fréquence du générateur de telle sorte que a <λ< 2a. Pour une fréquence de 2,45 GHz les dimensions des côtés du rectangle selon une section droite du guide seront a = 9 centimètres et b = 4,5 centimètres.The waveguide 1 is supplied with microwaves by the generator 2. The cross section of the guide 1 has a rectangular shape with a long side of length a and a short side of length b . It operates according to the fundamental mode TE₀₁, and the length a is chosen as a function of the frequency of the generator so that a <λ < 2a. For a frequency of 2.45 GHz the dimensions of the sides of the rectangle along a straight section of the guide will be a = 9 centimeters and b = 4.5 centimeters.

La partie extrême du guide 1, opposée au générateur, est fermée par un court-circuit 3. La partie extrême du guide 1 correspondant à l'amenée de l'énergie est terminée par un coude 4 à 90° assorti d'une bride de liaison au circuit d'alimentation comprenant le générateur 2. Ce circuit d'alimentation comprend un guide de propagation de l'onde sur lequel sont montés les organes de réglage des différents paramètres de fonctionnement du dispositif et en particulier un iris d'adaptation ; ces organes sont bien connus de l'homme de métier et ne sont pas décrits plus avant.The end part of the guide 1, opposite the generator, is closed by a short circuit 3. The end part of the guide 1 corresponding to the supply of energy is terminated by a bend 4 at 90 ° with a flange of connection to the supply circuit comprising the generator 2. This supply circuit comprises a wave propagation guide on which are mounted the members for adjusting the various operating parameters of the device and in particular an adaptation iris; these organs are well known to those skilled in the art and are not described further.

La partie coudée 4 , le guide 1 et le court-circuit 3 sont fendus longitudinalement sur les tronçons AB pour la partie coudée 4, BC, tout le long du guide 1, et CD pour le court-circuit. Cette fente unique est pratiquée selon l'axe médian de la grande face correspondante du guide 1. Cette fente d'une largeur de 0,6 centimètre permet l'introduction du bord du matériau plan le long de sa lisière à l'intérieur du guide 1 dans une zone où le champ électrique est maximum.The bent part 4, the guide 1 and the short-circuit 3 are split longitudinally on the sections AB for the bent part 4, BC, all along the guide 1, and CD for the short-circuit. This single slit is made along the median axis of the large corresponding face of the guide 1. This slit with a width of 0.6 cm allows the introduction of the edge of the flat material along its edge inside the guide 1 in an area where the electric field is maximum.

La fente unique est munie de deux lèvres 5 parallèles entre elles et au plan médian, placées immédiatement de part et d'autre de la fente et à l'extérieur du guide 1. Les deux lèvres 5 ont une largeur totale de 5 centimètres ; elles présentent sur leur partie extrême, c'est-à-dire sur le dernier 1,5 centimètre, un évasement par rapport au plan médian passant par la fente de l'ordre de 15°. Cette forme particulière facilite l'introduction du matériau entre les deux lèvres 5. De plus ces lèvres forment guide à la coupure, évitant d'éventuels rayonnements parasites du fait de la fente.The single slot is provided with two lips 5 parallel to each other and to the median plane, placed immediately on either side from the slot and outside the guide 1. The two lips 5 have a total width of 5 centimeters; they have on their extreme part, that is to say on the last 1.5 cm, a widening with respect to the median plane passing through the slot of the order of 15 °. This particular shape facilitates the introduction of the material between the two lips 5. In addition, these lips form a cut guide, avoiding possible parasitic radiation due to the slit.

La présence du court-circuit 3 et de l'iris d'adaptation permet de travailler en régime d'ondes stationnaires, le guide 1 fonctionnant en cavité résonnante. Ceci est particulièrement recherché pour limiter la longueur totale du guide, qui dans l'exemple décrit est de 75 centimètres. Bien sûr cette disposition nécessite une adaptation en impédance en fonction des propriétés diélectriques du matériau plan à sécher ; cependant lorsque la quantité d'eau présente dans le guide est importante comme c'est le cas d'un préséchage à la sortie d'un foulard d'imprégnation, le même réglage vaut pour une large gamme de matériaux.The presence of the short circuit 3 and of the adaptation iris makes it possible to work in the standing wave regime, the guide 1 operating in a resonant cavity. This is particularly sought to limit the total length of the guide, which in the example described is 75 centimeters. Of course, this arrangement requires an impedance adaptation as a function of the dielectric properties of the planar material to be dried; however, when the quantity of water present in the guide is large, as is the case with pre-drying at the outlet of an impregnation scarf, the same setting applies to a wide range of materials.

A l'oppposé de la fente et des lèvres 5, sur la face arrière du guide 1, sont pratiqués cinq orifices 6 situés approximativement dans le plan médian de la fente. Ces orifices 6 ont une forme sensiblement rectangulaire de longueur variable : les deux orifices extrêmes font 13,5 centimètres de longueur et les trois autres orifices font 9 centimètres de longueur ; leur largeur est de 1 centimètre. Ils sont régulièrement répartis tout le long de la face arrière du guide 1, et débouchent sur la chambre d'aspiration 7. Cette chambre 7 a la forme et fonctionne comme une hotte d'aspiration ; elle aspire par le circuit 8 et grâce à l'aspirateur 9 la vapeur d'eau, émise pendant le séchage à l'intérieur du guide 1, à travers les orifices 6.Opposite the slot and the lips 5, on the rear face of the guide 1, five holes 6 are made, located approximately in the median plane of the slot. These orifices 6 have a substantially rectangular shape of variable length: the two extreme orifices are 13.5 centimeters in length and the other three orifices are 9 centimeters in length; their width is 1 centimeter. They are regularly distributed all along the rear face of the guide 1, and lead to the suction chamber 7. This chamber 7 has the shape and functions as a suction hood; it sucks in through the circuit 8 and thanks to the vacuum cleaner 9 the water vapor, emitted during drying inside the guide 1, through the orifices 6.

Le fonctionnement du dispositif est le suivant. Le tissu 10 est un tissu de coton présentant une lisière rentrée 11. Le générateur utilisé a une puissance de 1200 watts. Le tissu 10 passe préalablement dans un foulard où il est imprégné d'un bain de traitement puis exprimé mécaniquement . Le taux d'humidité de la lisière 11 est de l'ordre de 86%. Avant son entrée dans la rame, le tissu 10 est introduit dans le dispositif de l'invention décrit ci-dessus de telle sorte que la lisière 11 pénètre dans la fente entre les lèvres 5. Le tissu 10 est alors positionné comme cela est illustré sur la figure. La lisière rentrée 11 se trouve à l'intérieur du guide 1 , dans la zone de champ maximum.The operation of the device is as follows. The fabric 10 is a cotton fabric with a tucked edge 11. The generator used has a power of 1200 watts. The fabric 10 passes beforehand through a scarf where it is impregnated with a treatment bath and then expressed mechanically. The humidity level of edge 11 is of the order of 86%. Before entering the train, the fabric 10 is introduced into the device of the invention described above so that the selvedge 11 enters the slot between the lips 5. The fabric 10 is then positioned as illustrated on the figure. The retracted edge 11 is inside the guide 1, in the maximum field area.

Le dispositif est placé sur le parcours du tissu entre la sortie du foulard d'imprégnation et l'entrée proprement dite de la rame. Le guide peut être mis en position horizontale ou verticale.The device is placed on the path of the fabric between the outlet of the impregnation scarf and the actual entrance of the train. The guide can be placed in a horizontal or vertical position.

A une vitesse de déplacement de 10 mètres par minute, le taux d'humidité de la lisière 11 après passage dans le guide 1 est tombé à 67 % environ, soit une évaporation de l'ordre de 20 % d'eau par rapport au poids de la lisière. A une vitesse de 20 mètres par minute, cette évaporation est de l'ordre de 11%, et à 40 mètres par minute elle est de l'ordre de 6 %. Cet abaissement du taux d'humidité de la lisière est suffisant pour, après passage dans la rame, obtenir un tissu régulièrement séché sur toute sa laize.At a movement speed of 10 meters per minute, the moisture content of the selvedge 11 after passing through the guide 1 has fallen to approximately 67%, ie an evaporation of the order of 20% of water relative to the weight of the edge. At a speed of 20 meters per minute, this evaporation is around 11%, and at 40 meters per minute it is around 6%. This lowering of the moisture content of the edge is sufficient to, after passing through the train, obtain a regularly dried fabric over its entire width.

Pendant le séchage du tissu dans le guide 1, l'aspirateur 9 est en marche et toute la vapeur d'eau produite à l'intérieur du guide 1 sous l'action des micro-ondes est aspirée à travers les orifices 6 vers la chambre d'aspiration 7 d'où elle est extraite par le conduit 8.During the drying of the fabric in the guide 1, the vacuum cleaner 9 is on and all the water vapor produced inside the guide 1 under the action of the microwaves is sucked through the orifices 6 towards the chamber suction 7 from which it is extracted through the conduit 8.

L'invention n'est pas limitée au mode de réalisation décrit ci-dessus à titre d'exemple. En particulier le guide d'onde peut avoir une forme circulaire, dans le cas d'un fonctionnement selon le mode TM₀₁ . Par ailleurs, elle n'est pas limitée aux matériaux textiles, mais peut s'appliquer à tous les matériaux plans mis en oeuvre en défilement continu et présentant une lisière qu'il convient de sécher préférentiellement au reste du matériau. De plus, elle peut s'appliquer non seulement au séchage par évaporation de l'eau mais aussi à tous les traitements de lisière pour lesquels l'action des micro-ondes est positive, par exemple fixation de liants.The invention is not limited to the embodiment described above by way of example. In particular, the waveguide may have a circular shape, in the case of operation according to the TM₀₁ mode. Furthermore, it is not limited to textile materials, but can be applied to all flat materials used in continuous scrolling and having an edge which should preferably be dried over the rest of the material. In addition, it can be applied not only to drying by evaporation of water but also to all edge treatments for which the action of microwaves is positive, for example fixing binders.

Claims (5)

1. Dispositif de séchage d'une lisière d'un matériau plan (10) en défilement continu, du type mettant en oeuvre un rayonnement micro-onde provenant d'un générateur (2) et composé d'un guide (1) de propagation des micro-ondes, allongé et fendu , caractérisé en ce que le guide (1) est exempt de ridge et il comporte deux lèvres (5) parallèles entre elles et au plan du matériau, dépassant de part et d'autre tout au long de la fente, et formant guide à la coupure.1. Device for drying an edge of a flat material (10) in continuous movement, of the type using microwave radiation from a generator (2) and composed of a propagation guide (1) microwave, elongated and split, characterized in that the guide (1) is free of ridge and it has two lips (5) parallel to each other and to the plane of the material, protruding on either side throughout the slot, and forming a guide to the cut. 2. Dispositif selon la revendication 1 caractérisé en ce que le guide (1) est fermé à l'extrémité opposée au générateur (2) par un court-circuit fendu.2. Device according to claim 1 characterized in that the guide (1) is closed at the end opposite to the generator (2) by a split short circuit. 3. Dispositif selon l'une des revendications 1 et 2 caractérisé en ce que la paroi du guide (1) en regard de la fente comporte différents orifices (6) reliés à un système d'aspiration (7,9).3. Device according to one of claims 1 and 2 characterized in that the wall of the guide (1) opposite the slot has different orifices (6) connected to a suction system (7,9). 4. Dispositif selon l'une des revendications 1 à 3 caractérisé en ce que le guide (1) étant un guide rectangulaire relié par un coude (4) au générateur (2) la fente est pratiquée sensiblement le long de l'axe médian du court-circuit (3) et de la grande face latérale du guide , contigue à la paroi extérieure du coude (4).4. Device according to one of claims 1 to 3 characterized in that the guide (1) being a rectangular guide connected by an elbow (4) to the generator (2) the slot is formed substantially along the median axis of the short circuit (3) and the large lateral face of the guide, adjacent to the outside wall of the elbow (4). 5. Dispositif selon la revendication 1 caractérisé en ce que le guide (1) est circulaire et en ce que la fente est pratiquée selon une génératrice en regard d'une zone de champ maximum et en ce qu'il comporte des tétons destinés à bloquer le champ parallèlement au matériau plan dans le guide.5. Device according to claim 1 characterized in that the guide (1) is circular and in that the slot is formed according to a generator facing a maximum field area and in that it comprises pins intended to block the field parallel to the planar material in the guide.
EP88401107A 1987-05-11 1988-05-06 Drying apparatus using micro-waves for the edge of a running web, in particular a textile web Withdrawn EP0291396A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706574A FR2615277B1 (en) 1987-05-11 1987-05-11 DEVICE FOR MICROWAVE DRYING OF AN EDGE OF A FLOWING PLANAR MATERIAL, ESPECIALLY TEXTILE
FR8706574 1987-05-11

Publications (1)

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EP0291396A1 true EP0291396A1 (en) 1988-11-17

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Application Number Title Priority Date Filing Date
EP88401107A Withdrawn EP0291396A1 (en) 1987-05-11 1988-05-06 Drying apparatus using micro-waves for the edge of a running web, in particular a textile web

Country Status (6)

Country Link
US (1) US4859821A (en)
EP (1) EP0291396A1 (en)
JP (1) JPS6428479A (en)
KR (1) KR880014337A (en)
FR (1) FR2615277B1 (en)
PT (1) PT87450A (en)

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CZ307332B6 (en) * 2009-11-12 2018-06-13 VĂšTS, a.s. A microwave dryer of plane figures, especially textiles and paper
CN112595072A (en) * 2020-12-03 2021-04-02 阜南县大自然工艺品股份有限公司 Raw material drying equipment for rattan-woven handicraft and using method thereof

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US5146058A (en) * 1990-12-27 1992-09-08 E. I. Du Pont De Nemours And Company Microwave resonant cavity applicator for heating articles of indefinite length
US6246037B1 (en) * 1999-08-11 2001-06-12 Industrial Microwave Systems, Inc. Method and apparatus for electromagnetic exposure of planar or other materials
US6532683B1 (en) 2001-04-20 2003-03-18 Bgf Industries, Inc. Drying method for woven glass fabric
CZ297159B6 (en) * 2001-12-17 2006-09-13 Výzkumný ústav textilních stroju Liberec, a.s. Microwave drier for fabrics
JP2011138968A (en) * 2009-12-28 2011-07-14 Senju Metal Ind Co Ltd Method for soldering surface-mount component, and surface-mount component
CN112212676B (en) * 2020-09-29 2022-06-07 安德里茨（中国）有限公司 Material thickness measuring mechanism, closed-loop control distributing device and dryer

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US4149322A (en) * 1976-08-27 1979-04-17 Fuji Photo Film Co., Ltd. Drying concentration of photographic emulsion coating by microwave irradiation
FR2448699A1 (en) * 1979-02-06 1980-09-05 Ciba Geigy Ag PROCESS FOR DRYING A CONTINUOUS WEB OF MATERIAL BY MICROWAVE AND APPARATUS FOR CARRYING OUT SAID METHOD

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GB1211789A (en) * 1968-11-22 1970-11-11 Canadian Patents Dev Apparatus and methods for drying the glue line in multi-sheet paper pads
US4149322A (en) * 1976-08-27 1979-04-17 Fuji Photo Film Co., Ltd. Drying concentration of photographic emulsion coating by microwave irradiation
FR2448699A1 (en) * 1979-02-06 1980-09-05 Ciba Geigy Ag PROCESS FOR DRYING A CONTINUOUS WEB OF MATERIAL BY MICROWAVE AND APPARATUS FOR CARRYING OUT SAID METHOD

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CZ307332B6 (en) * 2009-11-12 2018-06-13 VĂšTS, a.s. A microwave dryer of plane figures, especially textiles and paper
CN112595072A (en) * 2020-12-03 2021-04-02 阜南县大自然工艺品股份有限公司 Raw material drying equipment for rattan-woven handicraft and using method thereof

Also Published As

Publication number Publication date
US4859821A (en) 1989-08-22
JPS6428479A (en) 1989-01-31
FR2615277A1 (en) 1988-11-18
KR880014337A (en) 1988-12-23
PT87450A (en) 1989-05-31
FR2615277B1 (en) 1989-11-24

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