EP0560692B1 - Apparatus for heating a moving web by contact - Google Patents

Apparatus for heating a moving web by contact Download PDF

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Publication number
EP0560692B1
EP0560692B1 EP93420084A EP93420084A EP0560692B1 EP 0560692 B1 EP0560692 B1 EP 0560692B1 EP 93420084 A EP93420084 A EP 93420084A EP 93420084 A EP93420084 A EP 93420084A EP 0560692 B1 EP0560692 B1 EP 0560692B1
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EP
European Patent Office
Prior art keywords
heat source
web
sector
contact
hot
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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
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EP93420084A
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German (de)
French (fr)
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EP0560692A1 (en
Inventor
Claude Corbière
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Corbiere SA
Teintureries de la Turdine
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Corbiere SA
Teintureries de la Turdine
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Publication of EP0560692A1 publication Critical patent/EP0560692A1/en
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    • 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
    • D06B19/0076—Fixing of chemicals, e.g. dyestuffs, on textile materials by contact with a heated surface
    • 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
    • D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
    • D06B23/02—Rollers
    • D06B23/028—Rollers for thermal treatment

Definitions

  • the invention relates to a device for heating by contact a flexible sheet, textile in particular running; it relates more particularly to a device of the kind in question for chain printing by the transfer technique.
  • a device for heating a flexible moving material, such as paper, comprising at least one pair of fixed longitudinal convex heating sectors, arranged opposite to define a passage for the material, and means for guiding the material in movement against said fixed longitudinal heating sectors.
  • This device useful for heating paper on a coating machine for the formation of corrugated cardboard, cannot be used in the chain printing of a web of textile threads, because when the scrolling stops, it must, as before, immediately remove the cable from the contact of the fixed heating sectors.
  • this device completely lacks flexibility. In fact, when the running of the tablecloth is stopped, it is not possible to remove the portion of tablecloth included in contact with the heating drum, so that during restarting, it is necessary to cut the entire portion of tablecloth which was included in contact with said heating drum.
  • the invention overcomes these drawbacks. It is aimed at a device of the kind in question, which is easy to produce, reliable, ensures good contact at all points of the sheet and a homogeneous and constant tension, even in the event of the sheet stopping, without thermal disturbance or move the portion of the tablecloth that has stopped. In addition, this device makes it possible to restart the processing without offset of origin.
  • the device according to the invention consists in using a curved shoe formed of two sectors, one hot, one cold, this shoe having means enabling it to pivot when the scrolling of the tablecloth, to immediately bring the cold sector into contact with the stopped tablecloth in substitution for the hot sector Then conversely, to replace the hot sector (maintained at constant temperature) for the cold sector as soon as the water table is restarted.
  • the member delivering the transfer paper is braked, while the member for receiving the spent transfer paper is controlled.
  • the invention also relates to the warp knitting looms equipped with such a device, and in which the drive and reception members for the transfer paper are actuated in synchronism with the running members of the web of knitting yarns.
  • Figure 1 is a schematic summary representation of a device according to the invention.
  • Figure 2 is a schematic sectional representation of an improved heating cylinder.
  • Figure 3 is a summary representation of a chain transfer printing device according to the invention.
  • the contact heating device designated by the general reference (1) ( Figure 1), comprises a cylinder (2) consisting of two semi-cylindrical longitudinal sectors, respectively a hot sector (3) heated by suitable means , and a cold sector (4).
  • This cylinder (2) is mounted around a shaft (5) arranged along its longitudinal axis.
  • the shaft (5) has at one of its ends a toothed pinion (6) intended to rotate the cylinder (2) by 180 °.
  • the toothed wheel (6) cooperates, via a chain (7) associated with another toothed wheel (8), with a double-acting jack (9).
  • the device also comprises two fittings (10) and (11) formed by fixed stainless steel bars, the axis of which is parallel to the shaft (5).
  • the tablecloth (12) which scrolls from right to left, passes under the first input tie-down (10), then under the second output tie-down (11), so that the arc (13) of the tablecloth embraces the cylinder (2) over 180 °.
  • the reference (14) designates the heated or treated tablecloth which goes to the other work station.
  • a suitable conventional device synchronizes the control of the movement of the jack (9) with the triggering of the advancement or of the stopping of the ply (12).
  • the hot sector (3) is normally stationary in contact with the portion (13) of the traveling web. So all the points of the same width of the sheet (13) are subjected to the same temperature, under the same tension and for the same duration.
  • the jack (9) is actuated to rotate the cylinder (2) by 180 °, and thus immediately bring the cold sector (4) into substitution of the hot sector (3) in contact with the embraced sheet (13) immobilized.
  • FIG. 2 represents a particular embodiment of the heating cylinder according to the invention.
  • the two respectively heating (3) and cold (4) sectors are constituted by two identical semi-cylindrical shells of stainless steel, respectively (20) and (21), having insulating means (22) along their contact generators. and (23) to absorb the expansion caused by the heating of the hot shell (20).
  • These expansion means (22, 23) can be produced in a known manner, in particular by radial V-shaped angles.
  • the upper shell (20), the external surface of which is polished, is associated with electric heating resistors (25, 26) held together by wedges which are not shown. These resistors (25,26) are held in place by another semi-cylindrical, coaxial shell (24), for example made of aluminum.
  • the electrical resistors (25,26) are supplied by connections passing through the axis (5). It is important that during operation, the expansion of the hot shell (20) can be done without disturbing the cold shell (21), thanks to the expansion and insulation elements (22,23).
  • FIG. 3 represents a particular embodiment of the invention in its application to chain printing by transferring a sheet (30) of parallel warp threads in movement.
  • the heating cylinder formed of its two sectors respectively hot (3) and cold (4), is associated with an upright (31) placed on a sole (32) comprising the feed and receiving elements for transfer paper (33) , the outer face (34) of which is intended to come into contact with the ply of wires, at least on the portion (13).
  • the transfer paper (33) is cut from a reel (35) whose axis is parallel to the longitudinal axis (5) of the heating cylinder, placed on two idle rollers, respectively (36) and (37).
  • the unwound paper passes over a deflection roller (38) tangentially associated with a driving roller (39).
  • the paper (33) comes into contact with the ply (12) at the level of the input tie-down (10).
  • the paper (33) and more precisely its face carrying the pattern of dyes (34) is in contact with the sheet (13) which heats up.
  • the printed tablecloth (14) separates from the spent paper (40), which passes over a deflection roller (41), and from there is rewound into (42) on two rolls respectively (43 ) and (44).
  • the roller (44) is powered by the belt (46) driven by the engine (39).
  • the belt (47) essentially aims at slowing down the drive of the support roller (36), and thereby ensuring an appropriate tension on the transfer paper (33).
  • the two-position device according to the invention is characterized by its simplicity, by its efficiency, since as soon as the tablecloth scrolling stops and then when it is restarted, it pivots 180 °, which immediately prevents and then re-establishes contact between the heat source and the water table. It follows that during any stop, the sheet is maintained at all points and for the same duration at the same tension and at the same low temperature without offset of origin, and moreover, the heating pad is maintained independently at constant temperature . In this way, during the restart, there is no fault.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)

Abstract

Apparatus for heating a moving web (12-14) by contact over its entire width, with a heat source (2) of general convex shape, characterised in that the convex heat source (2): - comprises two longitudinal sectors, namely a hot sector (3) and a cold sector (4), - is mounted pivotably about its longitudinal axis (5), - has means (7, 9) intended to cause it to rotate about its longitudinal axis (5): . when the movement of the textile web (12-14) stops, in order to substitute the cold sector (4) immediately for the hot sector (3) in contact with the stopped web (13), . and, when the movement of the web resumes, in order once again to substitute the hot sector immediately for the cold sector in contact with the moving web. The intended use of the invention is line transfer printing. <IMAGE>

Description

L'invention concerne un dispositif pour chauffer par contact une nappe souple, textile notamment en défilement ; elle concerne plus particulièrement un dispositif du genre en question pour l'impression-chaine par la technique de transfert.The invention relates to a device for heating by contact a flexible sheet, textile in particular running; it relates more particularly to a device of the kind in question for chain printing by the transfer technique.

Dans la description, si l'invention est plus particulièrement décrite dans son application à l'impression-chaine par transfert, il va de soi qu'il ne s'agit là que d'un mode d'application préféré, l'invention pouvant être utilisée également pour le chauffage de toutes nappes de fils d'étoffes ou de films en défilement.In the description, if the invention is more particularly described in its application to chain printing by transfer, it goes without saying that this is only a preferred mode of application, the invention possibly also be used for the heating of all layers of fabric threads or running films.

La technique d'impression-chaine par transfert est bien connue. Elle est décrite par exemple dans les documents FR-A-2 254 950 et 2 296 727. Il n'y a donc pas lieu de la décrire ici en détail. Cette technique donne d'excellents résultats, mais n'est économiquement valable que pour des séries de longueur appréciable ; en outre, elle manque totalement de souplesse.The transfer chain printing technique is well known. It is described for example in documents FR-A-2 254 950 and 2 296 727. There is therefore no need to describe it here in detail. This technique gives excellent results, but is only economically valid for series of appreciable length; moreover, it totally lacks flexibility.

Dans le document EP-A-0 461 048, les Demandeurs ont décrit un procédé d'impression-chaine par transfert sur un métier à tisser chaine et trame, au moyen d'un patin chauffant régulé en température, appuyant en permanence la feuille transfert sur toute la largeur de la nappe de fils de chaine en défilement.In document EP-A-0 461 048, the Applicants have described a process of chain printing by transfer onto a warp and weft weaving loom, by means of a heating pad regulated in temperature, permanently pressing the transfer sheet over the entire width of the web of traveling threads.

Cette solution donne d'excellents résultats avec les métiers chaine et trame. En revanche, avec les métiers à tricoter chaine, compte tenu de la vitesse de défilement importante des fils, il serait nécessaire d'allonger considérablement la longueur du contact du patin pour obtenir un chauffage suffisant. De la sorte, on est conduit à faire appel à des patins courbes pour assurer en tous points un bon contact sur la nappe de fils. Malheureusement, lorsqu'on fait appel à un patin chauffant courbe au contact duquel se déplace la nappe de fils, lorsqu'on arrête le défilement de cette nappe, il faudrait immédiatement retirer la nappe du contact ou du rayonnement du patin, tout en maintenant la nappe sous tension constante, de manière à pouvoir redémarrer dans des conditions optimum et sans marque d'arrêt, ce que l'on ne sait pas faire.This solution gives excellent results with the warp and weft trades. On the other hand, with warp knitting looms, given the high speed of travel of the threads, it would be necessary to considerably lengthen the length of the pad contact to obtain sufficient heating. In this way, we are led to use curved pads to ensure good contact at all points on the sheet of son. Unfortunately, when using a curved heating pad in contact with which the ply of wires moves, when you stop the running of this ply, you should immediately remove the ply from the contact or radiation of the pad, while maintaining the tablecloth under constant tension, so that you can restart in optimum conditions and without a stop mark, which we do not know how to do.

Dans le document FR-A-2 451 415, on a décrit un dispositif de chauffage d'un matériau souple en défilement, tel que du papier, comportant au moins une paire de secteurs longitudinaux fixes chauffants convexes, disposés en vis à vis pour définir un passage pour le matériau, et des moyens pour guider le matériau en défilement contre lesdits secteurs longitudinaux chauffants fixes. Ce dispositif, utile pour le chauffage d'un papier sur une machine de couchage pour la formation de carton ondulé, n'est pas utilisable dans l'impression chaine d'une nappe de fils textiles, car lorsque le défilement s'arrête, il faut, comme précédemment, retirer immédiatement la nappe du contact des secteurs chauffants fixes.In document FR-A-2 451 415, a device has been described for heating a flexible moving material, such as paper, comprising at least one pair of fixed longitudinal convex heating sectors, arranged opposite to define a passage for the material, and means for guiding the material in movement against said fixed longitudinal heating sectors. This device, useful for heating paper on a coating machine for the formation of corrugated cardboard, cannot be used in the chain printing of a web of textile threads, because when the scrolling stops, it must, as before, immediately remove the cable from the contact of the fixed heating sectors.

Dans le document FR-A-2 254 950, déjà cité dans le préambule, on a décrit un dispositif d'impression chaîne d'un nappe de fils en défilement, comprenant :

  • une source de chaleur formée par un tambour cylindrique fixe ;
  • deux embarrages respectivement d'entrée et de sortie dont l'axe est parallèle à l'axe longitudinal du tambour chauffant cylindrique et qui sont disposés par rapport à celle-ci de manière à ce que la nappe de fils embrasse le tambour chauffant sur un arc de cercle ;
  • un organe d'entraînement du papier transfert pour l'amener sous l'embarrage d'entrée entre la source de chaleur et la nappe qui défile ;
  • et deux organes de réception, respectivement du papier transfert épuisé et de la nappe de fils imprimés.
In document FR-A-2 254 950, already cited in the preamble, a device has been described for chain printing of a web of threads in movement, comprising:
  • a heat source formed by a fixed cylindrical drum;
  • two input and output fixtures whose axis is parallel to the longitudinal axis of the cylindrical heating drum and which are arranged relative thereto so that the sheet of wires embraces the heating drum on an arc of a circle;
  • a transfer paper drive member for bringing it under the input tie between the heat source and the traveling web;
  • and two receiving members, respectively exhausted transfer paper and the web of printed yarns.

Comme déjà dit, ce dispositif manque totalement de souplesse. En effet, lorsqu'on arrête le défilement de la nappe, il n'est pas possible de retirer la portion de nappe comprise au contact du tambour chauffant, de sorte que lors du redémarage, il faut couper toute la portion de nappe qui était comprise au contact dudit tambour chauffant.As already said, this device completely lacks flexibility. In fact, when the running of the tablecloth is stopped, it is not possible to remove the portion of tablecloth included in contact with the heating drum, so that during restarting, it is necessary to cut the entire portion of tablecloth which was included in contact with said heating drum.

L'invention pallie ces inconvénients. Elle vise un dispositif du genre en question, qui soit facile à réaliser, fiable, assure un bon contact en tous points de la nappe et une tension homogène et constante, même en cas d'arrêt de la nappe, et ce sans perturber thermiquement ni déplacer la portion de nappe arrêtée. En outre, ce dispositif permet de redémarrer le traitement sans décalage d'origine.The invention overcomes these drawbacks. It is aimed at a device of the kind in question, which is easy to produce, reliable, ensures good contact at all points of the sheet and a homogeneous and constant tension, even in the event of the sheet stopping, without thermal disturbance or move the portion of the tablecloth that has stopped. In addition, this device makes it possible to restart the processing without offset of origin.

Ce dispositif pour chauffer par contact sur toute sa largeur une nappe en défilement, au moyen d'une source de chaleur de forme générale convexe, comprenant deux secteurs longitudinaux, se caractérise en ce que la source de chaleur :

  • est formée de deux secteurs longitudinaux cylindriques accolés par leur base, respectivement un secteur chaud et un secteur froid ;
  • est montée pivotante autour de son axe longitudinal,
  • présente des moyens, destinés à la faire tourner autour de son axe longitudinal :
    • . lorsque le défilement de la nappe textile s'arrête, pour substituer immédiatement le secteur froid au secteur chaud au contact de la nappe arrêtée,
    • . et lorsque le défilement de la nappe reprend, pour substituer à nouveau immédiatement le secteur chaud au secteur froid au contact de la nappe qui défile.
This device for heating by contact over its entire width a traveling web, by means of a generally convex heat source, comprising two longitudinal sectors, is characterized in that the heat source:
  • is formed of two cylindrical longitudinal sectors joined by their base, respectively a hot sector and a cold sector;
  • is pivotally mounted around its longitudinal axis,
  • presents means, intended to rotate it around its longitudinal axis:
    • . when the scrolling of the textile tablecloth stops, to immediately replace the cold sector with the hot sector in contact with the stopped tablecloth,
    • . and when the scrolling of the sheet resumes, to immediately replace the hot sector again for the cold sector in contact with the sheet which is scrolling.

En d'autres termes, le dispositif selon l'invention consiste à faire appel à un patin courbe formé de deux secteurs, l'un chaud, l'un froid, ce patin présentant des moyens lui permettant de pivoter lors de l'arrêt du défilement de la nappe, pour amener immédiatement le secteur froid au contact de la nappe arrêtée en substitution du secteur chaud. Puis inversement, à substituer le secteur chaud (maintenu à température constante) au secteur froid dès le redémarrage de la nappe.In other words, the device according to the invention consists in using a curved shoe formed of two sectors, one hot, one cold, this shoe having means enabling it to pivot when the scrolling of the tablecloth, to immediately bring the cold sector into contact with the stopped tablecloth in substitution for the hot sector Then conversely, to replace the hot sector (maintained at constant temperature) for the cold sector as soon as the water table is restarted.

Avantageusement, en pratique :

  • la source de chaleur est partie de la forme générale d'un cylindre ;
  • ce cylindre est monté sur un arbre longitudinal et présente à une extrémité, une roue dentée coopérant, par l'intermédiaire d'une chaine ou analogue, avec un vérin actionné par l'organe de commande du démarrage, ou d'arrêt du défilement de la nappe ;
  • le cylindre présente deux secteurs longitudinaux, respectivement chaud et froid, et le pivotement lors de l'arrêt ou du redémarrage de la nappe est de 180° ;
  • le cylindre est formé de deux coquilles demi-cylindriques présentant le long de leurs génératrices de contact, des moyens isolants pour absorber la dilatation provoquée par l'échauffement du secteur chaud.
Advantageously, in practice:
  • the heat source is part of the general shape of a cylinder;
  • this cylinder is mounted on a longitudinal shaft and has at one end, a toothed wheel cooperating, via a chain or the like, with a jack actuated by the control member for starting, or for stopping the movement of the tablecloth ;
  • the cylinder has two longitudinal sectors, respectively hot and cold, and the pivoting when stopping or restarting the ply is 180 °;
  • the cylinder is formed by two semi-cylindrical shells having along their contact generators, insulating means for absorbing the expansion caused by the heating of the hot sector.

L'invention concerne également un dispositif pour imprimer chaine un motif sur une nappe de fils textiles parallèles en défilement, au moyen d'un papier transfert portant un motif de colorants, et sous l'action combinée de la chaleur et de la pression, notamment pour métier à tricoter chaine. Ce dispositif qui comprend :

  • . une source de chaleur présentant un axe longitudinal ;
  • . deux embarrages respectivement d'entrée et de sortie, dont l'axe est parallèle à l'axe longitudinal de la source de chaleur, disposés par rapport à celle-ci de manière à ce que la nappe embrasse la source de chaleur sur un arc de cercle ;
  • . un organe d'entraînement de papier transfert, pour amener ce papier sous l'embarrage d'entrée entre la source de chaleur et la nappe qui défile ;
  • . et un organe de réception du papier transfert épuisé ; se caractérise en ce qu'il comporte une source de chaleur cylindrique telle que définie précédemment.
The invention also relates to a device for chain printing a pattern on a web of parallel textile threads in movement, by means of a transfer paper carrying a dye pattern, and under the action combined with heat and pressure, especially for warp knitting. This device which includes:
  • . a heat source having a longitudinal axis;
  • . two input and output interlockings respectively, the axis of which is parallel to the longitudinal axis of the heat source, arranged with respect to the latter so that the sheet embraces the heat source on an arc of circle;
  • . a transfer paper drive member, for bringing this paper under the input tie-down between the heat source and the traveling web;
  • . and a body for receiving the spent transfer paper; is characterized in that it comprises a cylindrical heat source as defined above.

Avantageusement, en pratique, l'organe délivrant le papier transfert est freiné, alors que l'organe de réception du papier transfert épuisé est commandé.Advantageously, in practice, the member delivering the transfer paper is braked, while the member for receiving the spent transfer paper is controlled.

L'invention concerne également les métiers à tricoter chaine équipés d'un tel dispositif, et dans lequel les organes d'entraînement et de réception du papier transfert sont actionnés en synchronisme avec les organes de défilement de la nappe de fils à tricoter.The invention also relates to the warp knitting looms equipped with such a device, and in which the drive and reception members for the transfer paper are actuated in synchronism with the running members of the web of knitting yarns.

La manière dont l'invention peut être réalisée et les avantages qui en découlent, ressortiront mieux des exemples de réalisations qui suivent, à l'appui des figures annexées.The manner in which the invention can be implemented and the advantages which ensue therefrom will emerge more clearly from the examples of embodiments which follow, in support of the appended figures.

La figure 1 est une représentation schématique sommaire d'un dispositif conforme à l'invention.Figure 1 is a schematic summary representation of a device according to the invention.

La figure 2 est une représentation schématique en coupe d'un cylindre de chauffage perfectionné.Figure 2 is a schematic sectional representation of an improved heating cylinder.

La figure 3 est une représentation sommaire d'un dispositif d'impression transfert chaine selon l'invention.Figure 3 is a summary representation of a chain transfer printing device according to the invention.

Le dispositif de chauffage par contact selon l'invention désigné par la référence générale (1) (figure 1), comprend un cylindre (2) constitué de deux secteurs longitudinaux demi-cylindriques, respectivement un secteur chaud (3) chauffé par des moyens appropriés, et un secteur froid (4). Ce cylindre (2) est monté autour d'un arbre (5) disposé le long de son axe longitudinal.The contact heating device according to the invention designated by the general reference (1) (Figure 1), comprises a cylinder (2) consisting of two semi-cylindrical longitudinal sectors, respectively a hot sector (3) heated by suitable means , and a cold sector (4). This cylinder (2) is mounted around a shaft (5) arranged along its longitudinal axis.

Selon une première caractéristique de l'invention, l'arbre (5) présente à une de ses extrémités un pignon denté (6) destiné à faire pivoter le cylindre (2) de 180°. Pour ce faire, la roue dentée (6) coopère, par l'intermédiaire d'une chaine (7) associée à une autre roue dentée (8), avec un vérin (9) à double effet.According to a first characteristic of the invention, the shaft (5) has at one of its ends a toothed pinion (6) intended to rotate the cylinder (2) by 180 °. To do this, the toothed wheel (6) cooperates, via a chain (7) associated with another toothed wheel (8), with a double-acting jack (9).

Le dispositif comprend également deux embarrages (10) et (11) formés par des barres fixes en acier inoxydable, dont l'axe est parallèle à l'arbre (5). La nappe (12) qui défile de la droite vers la gauche, passe sous le premier embarrage d'entrée (10), puis sous le second embarrage de sortie (11), de manière à ce que l'arc (13) de la nappe embrasse le cylindre (2) sur 180°. La référence (14) désigne la nappe chauffée ou traitée qui s'en va vers l'autre poste de travail.The device also comprises two fittings (10) and (11) formed by fixed stainless steel bars, the axis of which is parallel to the shaft (5). The tablecloth (12) which scrolls from right to left, passes under the first input tie-down (10), then under the second output tie-down (11), so that the arc (13) of the tablecloth embraces the cylinder (2) over 180 °. The reference (14) designates the heated or treated tablecloth which goes to the other work station.

Un dispositif approprié classique, mais non représenté, synchronise la commande du mouvement du vérin (9) avec le déclenchement de l'avancée ou de l'arrêt de la nappe (12).A suitable conventional device, but not shown, synchronizes the control of the movement of the jack (9) with the triggering of the advancement or of the stopping of the ply (12).

En cours de fonctionnement, c'est-à-dire en cours de défilement de la nappe (12), le secteur chaud (3) est normalement immobile au contact de la portion (13) de la nappe qui défile. Donc tous les points de la même largeur de la nappe (13) sont soumis à la même température, sous la même tension et pendant la même durée.During operation, that is to say while the web (12) is running, the hot sector (3) is normally stationary in contact with the portion (13) of the traveling web. So all the points of the same width of the sheet (13) are subjected to the same temperature, under the same tension and for the same duration.

Lorsque le défilement de la nappe (12) s'arrête pour une raison quelconque, automatiquement, le vérin (9) est actionné pour faire pivoter le cylindre (2) de 180° , et pour ainsi amener immédiatement le secteur froid (4) en substitution du secteur chaud (3) au contact de la nappe embrassée (13) immobilisée.When the movement of the web (12) stops for any reason, automatically, the jack (9) is actuated to rotate the cylinder (2) by 180 °, and thus immediately bring the cold sector (4) into substitution of the hot sector (3) in contact with the embraced sheet (13) immobilized.

Il s'ensuit que pendant toute cette interruption, la position, la forme et la tension de la nappe (12,13,14) n'ont pas été modifiées. Lors du redémarrage, automatiquement le vérin (9) actionne le pivotement du cylindre (2), de manière à ce que le secteur chaud (3) revienne à nouveau au contact de la nappe (13). Comme pendant toute cette phase d'interruption, la température du secteur chaud (3) n'a pas été modifiée, tous les points du secteur embrassé (13) de la nappe, sont donc soumis à la même tension et à la même température et pendant la même durée, ce que l'on ne savait obtenir jusqu'alors.It follows that during all this interruption, the position, the shape and the tension of the ply (12,13,14) were not modified. When restarting, the cylinder (9) automatically actuates the pivoting of the cylinder (2), so that the hot sector (3) returns again to the contact with the ply (13). As during all this interruption phase, the temperature of the hot sector (3) has not been modified, all the points of the embraced sector (13) of the sheet, are therefore subjected to the same voltage and to the same temperature and during the same period, which we never knew how to obtain until then.

La figure 2 représente un mode d'exécution particulier du cylindre chauffant selon l'invention. Les deux secteurs respectivement chauffant (3) et froid (4), sont constitués par deux coquilles demi-cylindriques identiques en acier inoxydable, respectivement (20) et (21), présentant le long de leurs génératrices de contact des moyens isolants (22) et (23) pour absorber la dilatation provoquée par l'échauffement de la coquille chaude (20). Ces moyens de dilatation (22,23) peuvent être réalisés de manière connue, notamment par des cornières en V radiales.FIG. 2 represents a particular embodiment of the heating cylinder according to the invention. The two respectively heating (3) and cold (4) sectors are constituted by two identical semi-cylindrical shells of stainless steel, respectively (20) and (21), having insulating means (22) along their contact generators. and (23) to absorb the expansion caused by the heating of the hot shell (20). These expansion means (22, 23) can be produced in a known manner, in particular by radial V-shaped angles.

La coquille supérieure (20) dont l'état de surface externe est poli, est associée à des résistances électriques chauffantes (25,26) maintenues entre elles par des cales non représentées. Ces résistances (25,26) sont maintenues en place par une autre coquille demi-cylindrique, coaxiale (24), par exemple en aluminium.The upper shell (20), the external surface of which is polished, is associated with electric heating resistors (25, 26) held together by wedges which are not shown. These resistors (25,26) are held in place by another semi-cylindrical, coaxial shell (24), for example made of aluminum.

Les résistances électriques (25,26) sont alimentées par des connexions passant par l'axe (5). Il importe qu'en cours de fonctionnement, la dilatation de la coquille chaude (20) puisse se faire sans perturber la coquille froide (21), et ce grâce aux éléments de dilatation et d'isolation (22,23).The electrical resistors (25,26) are supplied by connections passing through the axis (5). It is important that during operation, the expansion of the hot shell (20) can be done without disturbing the cold shell (21), thanks to the expansion and insulation elements (22,23).

La figure 3 représente un mode de réalisation particulier de l'invention dans son application à l'impression-chaine par transfert d'une nappe (30) de fils de chaine parallèles en déplacement. Le cylindre chauffant, formé de ses deux secteurs respectivement chaud (3) et froid (4), est associé à un montant (31) posé sur une sole (32) comportant les organes d'alimentation et de réception du papier transfert (33), dont la face extérieure (34) est destinée à venir s'appliquer au contact de la nappe de fils, du moins sur la portion (13).FIG. 3 represents a particular embodiment of the invention in its application to chain printing by transferring a sheet (30) of parallel warp threads in movement. The heating cylinder, formed of its two sectors respectively hot (3) and cold (4), is associated with an upright (31) placed on a sole (32) comprising the feed and receiving elements for transfer paper (33) , the outer face (34) of which is intended to come into contact with the ply of wires, at least on the portion (13).

Le papier transfert (33) est débité à partir d'une bobine (35) dont l'axe est parallèle à l'axe longitudinal (5) du cylindre chauffant, posée sur deux rouleaux fous, respectivement (36) et (37). Le papier déroulé passe sur un rouleau de renvoi (38) associé tangentiellement à un rouleau moteur (39). Le papier (33) rentre au contact de la nappe (12) au niveau de l'embarrage d'entrée (10). Pendant tout le trajet chaud, le papier (33) et plus précisément sa face portant le motif de colorants (34), est au contact de la nappe (13) qui se chauffe. Au niveau de l'embarrage de sortie, la nappe imprimée (14) se sépare du papier épuisé (40), qui passe sur un rouleau de renvoi (41), et de là est rembobinée en (42) sur deux rouleaux respectivement (43) et (44). Le rouleau (44) est moteur grâce à la courroie (46) entraînée par le moteur (39). La courroie (47) vise essentiellement à freiner l'entrainement du rouleau support (36), et par là à assurer une tension appropriée sur le papier transfert (33).The transfer paper (33) is cut from a reel (35) whose axis is parallel to the longitudinal axis (5) of the heating cylinder, placed on two idle rollers, respectively (36) and (37). The unwound paper passes over a deflection roller (38) tangentially associated with a driving roller (39). The paper (33) comes into contact with the ply (12) at the level of the input tie-down (10). Throughout the hot journey, the paper (33) and more precisely its face carrying the pattern of dyes (34), is in contact with the sheet (13) which heats up. At the output material, the printed tablecloth (14) separates from the spent paper (40), which passes over a deflection roller (41), and from there is rewound into (42) on two rolls respectively (43 ) and (44). The roller (44) is powered by the belt (46) driven by the engine (39). The belt (47) essentially aims at slowing down the drive of the support roller (36), and thereby ensuring an appropriate tension on the transfer paper (33).

Le dispositif à deux positions selon l'invention se caractérise par sa simplicité, par son efficacité, puisque dès l'arrêt du défilement de la nappe puis lors de son redémarrage, il pivote de 180°, ce qui évite puis rétablit immédiatement le contact entre la source de chaleur et la nappe. Il s'ensuit que pendant tout arrêt, la nappe est maintenue en tous points et pendant la même durée à la même tension et à la même faible température sans décalage d'origine, et par ailleurs, le patin chauffant est maintenu indépendamment à température constante. De la sorte, lors du redémarrage, il n'y a pas de défaut.The two-position device according to the invention is characterized by its simplicity, by its efficiency, since as soon as the tablecloth scrolling stops and then when it is restarted, it pivots 180 °, which immediately prevents and then re-establishes contact between the heat source and the water table. It follows that during any stop, the sheet is maintained at all points and for the same duration at the same tension and at the same low temperature without offset of origin, and moreover, the heating pad is maintained independently at constant temperature . In this way, during the restart, there is no fault.

Si l'invention est particulièrement appropriée à l'impression transfert des nappes de chaine des métiers à tricoter, elle peut recevoir d'autres applications pour le traitement d'autres nappes de films, de fils ou même d'étoffes, tels que par exemple :

  • effets spéciaux ombrés contrôlés par transfert sur tissus, le tissu glissant de façon contrôlée sur le papier transfert ;
  • traitement thermique délicat, par exemple de rétraction de fibres en nappes à une température voisine de celle du point de collage ;
  • traitement de nappes encollées ; en effet, de nombreuses colles déposées sur les nappes textiles ont besoin d'un chauffage contrôlé en temps et température de pré-polymérisation pour être "amoureuses" ; un excès les polymérise complètement, cet excès interdit alors le collage sur la partie excessivement chauffée ; un manque de chauffage interdit aussi le collage ; le dispositif proposé permet une prépolymérisation constante même lorsque la machine doit s'arrêter ;
  • traitement de rétraction contrôlée de films plastiques.
If the invention is particularly suitable for transfer printing of the webs of warp knitting, it can receive other applications for the treatment of other webs of films, threads or even fabrics, such as for example :
  • shaded special effects controlled by transfer to fabrics, the fabric sliding in a controlled manner on the transfer paper;
  • delicate heat treatment, for example shrinking fibers in sheets at a temperature close to that of the bonding point;
  • treatment of glued tablecloths; indeed, many glues deposited on the textile tablecloths need a controlled heating in time and temperature of pre-polymerization to be "in love"; an excess completely polymerizes them, this excess then prevents sticking to the excessively heated part; a lack of heating also prohibits sticking; the proposed device allows constant prepolymerization even when the machine has to stop;
  • treatment of controlled shrinkage of plastic films.

Claims (7)

  1. Device for heating a moving web (12-14) by contact over its entire width, by means of a heat source (2) of convex general shape, comprising two longitudinal sectors, characterized in that the heat source (2):
    - is formed by two semicylindrical longitudinal sectors (3, 4) joined by their base, respectively a hot sector (3) and a cold sector (4);
    - is mounted so as to pivot about its longitudinal axis (5);
    - and has means (7, 9) intended to rotate it about this longitudinal axis (5):
    . when the movement of the textile web (12-14) stops, in order to substitute immediately the cold sector (4) for the hot sector (3) in contact with the stopped web (13);
    . and, when the movement of the web resumes, in order again to substitute immediately the hot sector (3) for the cold sector (4) in contact with the moving web (13).
  2. Device according to Claim 1, characterized in that the cylindrical heat source (2) is mounted on a shaft (5) which has, at one of its ends, a toothed wheel (6) engaging via a chain (7) with an actuator (9) driven by the member for starting (or stopping) the movement of the web (12).
  3. Device according to Claim 1, characterized in that when the web (12) stops or restarts, the cylindrical heat source (2) pivots through 180°.
  4. Device according to Claim 1, characterized in that the cylindrical heat source (2) is formed by two semicylindrical shells (20, 21) joined together, having, along their contact generatrices, insulating means (22, 23) for absorbing the expansion caused by the heating up of the hot shell (20).
  5. Device for warp printing a pattern (34) on a moving web of parallel textile yarns (30), by means of a transfer paper (33) bearing a pattern of colorants (34), and under the combined action of heat and pressure, comprising:
    - a heat source (2) having a longitudinal axis (5);
    - two deflector rolls (10, 11), respectively the input and output deflector rolls, the axes of which are parallel to the longitudinal axis (5) of the heat source (2) and which are arranged with respect to the latter so that the web (13) hugs the heat source (2) over an arc of a circle;
    - a member (36, 37, 39) for driving the transfer paper (33) in order to bring this paper under the input deflector roll (10) between the heat source (2) and the moving web (12);
    - a member (43, 44, 45, 39) for taking up the exhausted transfer paper (40);
    characterised in that it includes a cylindrical heat source (2) according to one of Claims 1 to 4.
  6. Device according to Claim 5, characterized in that the member (36, 37) for driving the transfer paper (33) is braked and in that the member (43, 44) for taking up the exhausted transfer paper (40) is driven (39).
  7. Warp knitting machine, characterized in that it includes a transfer printing device according to either of Claims 5 and 6.
EP93420084A 1992-03-10 1993-02-23 Apparatus for heating a moving web by contact Expired - Lifetime EP0560692B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9203188A FR2688522B1 (en) 1992-03-10 1992-03-10 DEVICE FOR HEATING BY CONTACT A FLOWING TABLECLOTH.
FR9203188 1992-03-10

Publications (2)

Publication Number Publication Date
EP0560692A1 EP0560692A1 (en) 1993-09-15
EP0560692B1 true EP0560692B1 (en) 1995-12-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420084A Expired - Lifetime EP0560692B1 (en) 1992-03-10 1993-02-23 Apparatus for heating a moving web by contact

Country Status (5)

Country Link
EP (1) EP0560692B1 (en)
AT (1) ATE132215T1 (en)
DE (1) DE69301114T2 (en)
ES (1) ES2084474T3 (en)
FR (1) FR2688522B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10815614B2 (en) 2015-11-05 2020-10-27 Dsm Ip Assets B.V. Methods to manufacture a textile product

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1200168A (en) * 1968-02-03 1970-07-29 Vepa Ag Device for the treatment of textile material
FR2451415A1 (en) * 1979-03-15 1980-10-10 Astin France Assist Tech Indle Device for controlled heating of surfaces - of continuously fed paper or cardboard sheet
FR2662716B1 (en) * 1990-05-29 1994-04-01 Corbiere Sa PROCESS FOR PRINTING CHAIN A PATTERN ON A CHAIN FABRIC AND CHAIN PRINTED FABRICS THUS OBTAINED.

Also Published As

Publication number Publication date
ATE132215T1 (en) 1996-01-15
FR2688522A1 (en) 1993-09-17
DE69301114T2 (en) 1996-05-15
ES2084474T3 (en) 1996-05-01
FR2688522B1 (en) 1994-05-06
DE69301114D1 (en) 1996-02-08
EP0560692A1 (en) 1993-09-15

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