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EP1355744B1 - Thermofusible glue applicator - Google Patents

Thermofusible glue applicator Download PDF

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Publication number
EP1355744B1
EP1355744B1 EP02701360A EP02701360A EP1355744B1 EP 1355744 B1 EP1355744 B1 EP 1355744B1 EP 02701360 A EP02701360 A EP 02701360A EP 02701360 A EP02701360 A EP 02701360A EP 1355744 B1 EP1355744 B1 EP 1355744B1
Authority
EP
European Patent Office
Prior art keywords
substrate
heating
chamber
applicator according
glue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02701360A
Other languages
German (de)
French (fr)
Other versions
EP1355744A1 (en
Inventor
Francis Richardot
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.)
Isaberg Rapid AB
Original Assignee
Isaberg Rapid AB
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Filing date
Publication date
Application filed by Isaberg Rapid AB filed Critical Isaberg Rapid AB
Publication of EP1355744A1 publication Critical patent/EP1355744A1/en
Application granted granted Critical
Publication of EP1355744B1 publication Critical patent/EP1355744B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/00546—Details of the heating means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y10T156/1798—Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/18—Surface bonding means and/or assembly means with handle or handgrip

Definitions

  • the present invention relates to an applicator of hot-melt adhesive and, more particularly, to such an applicator of the type described in the United States patent America N ° 6 142 207 sold to SOFRAGRAF INDUSTRIES, represented schematically in Figure 1 of the accompanying drawing, in axial section.
  • this applicator generally takes the form a pistol and includes a casing 1 enclosing a tubular heating body 2 pierced an elongated chamber 3 having a first end 4 shaped as an inlet for a stick B of hot-melt adhesive and a second end 5 fitted with a nozzle 6 for dispensing molten glue.
  • the applicator still includes means (not shown) designed to gradually push the stick B of glue into a socket 7 coaxial with the chamber 3, then in this chamber, and means for electric heating of the part of the glue stick which is pushed into the bedroom.
  • the applicator also includes a handle 8 equipped with a trigger 9 for actuating the pushing means of the stick, these means being able to be constituted, for example, by a mechanical transmission with rods or rack, as is well known.
  • the means of electric heating of the mass of adhesive contained in the chamber 3 are supplied by electric wires 10 connected to a terminal block 11 1 of a circuit 11 for regulating the supply of these heating means.
  • the circuit 11 is itself supplied with electrical energy by a cable 12 connected on the one hand to a terminal block 11 2 of the circuit 11 and on the other hand to the network.
  • the circuit 11 could also be supplied by a storage battery, internal or external to the applicator.
  • the heating means include one or more heating elements each consisting of a track in an electrically resistant material provided with means for connection to a source of electrical energy, this track being formed on an electrical insulating surface of a substrate arranged to be in thermal contact with the adhesive mass contained in room 3.
  • Such a flat heating element can be produced using means used to the manufacture of thick-film hybrid circuits, of which we know that they are made an alumina substrate, enamelled sheet or stainless sheet for example, covered with a dielectric, the substrate receiving by screen printing a track formed of a paste which, after drying, constitutes a resistive "ink” capable of heating a mass of adjacent glue by Joule effect and thermal conduction, when crossed by a Electric power.
  • the heating elements thus formed have many advantages on the electric heating means conventionally used in the applicators of hot melt glue. Their temperature rise is very rapid, due to their low thermal inertia. Their heating power, per unit area, is very high. In besides the serigraphy allows a great variety in the design of the tracks. adaptation such heating elements for specific or new needs is so facilitated.
  • the aforementioned patent describes various embodiments of an adhesive applicator hot-melt equipped with such heating elements, in which these line everything or part of the wall of chamber 3, so as to establish thermal contact optimal with the mass of glue contained in this chamber.
  • the heater 2 is then made with a material constituting a thermal insulator.
  • the object of the present invention is therefore to produce an adhesive applicator hot-melt which does not have the drawbacks mentioned above and which, in particular, include a perfectly sealed heating body vis-à-vis the adhesive melted, the installation of the heating elements being made very easy.
  • a hot-melt adhesive applicator comprising a) an elongated chamber having a first end shaped as entry for a stick of said hot-melt adhesive and a second end equipped with a molten glue distribution nozzle, b) means for pushing gradually the stick in the room and c) means of electric heating the part of the stick contained in the chamber, comprising at least one element heater consisting of at least one track made of an electrically resistant material and provided with means of connection to a source of electrical energy, this track being formed on an electrically insulated surface of a substrate arranged to be in thermal contact with a mass of glue contained in the chamber.
  • the applicator is remarkable in that the heating element is tightly applied against a conforming external facet of a heating body including a surface interior delimits the chamber, the heating body being made of a material conductor of heat.
  • the substrate can be an isolated metal substrate.
  • the track formed on the substrate can be arranged on the face of this substrate which is opposite that applied against the heating body.
  • the heating element may also include at least two tracks of an electrically resistant material, each arranged on one of the two faces of the substrate of this element.
  • the substrate of the heating element can also be made of a material electrically insulating.
  • the heating body 2 has an external surface shaped to receive, in close contact, two heating elements 13 1 , 13 2 on two opposite flat facets 2 1 , 2 2 of this external surface (only the facet 2 1 is visible in the figure 2).
  • An interior surface of the heating body delimits the chamber 3.
  • the two heating elements are identical and each consist of a substrate 14 1 , 14 2 covered, on at least one face, with a screen-printed track such as track 15 1 visible on the substrate 14 1 of the heating element 13 1 .
  • heating elements are of the type described in the aforementioned United States patent, formed of a planar substrate packed by screen printing with a resistive paste or "ink” drawing the track 15 1 , according to the technology used for make thick-film hybrid circuits. Reference may also be made to the aforementioned United States patent for more details on the materials suitable for constituting the substrate and the tracks of the heating elements.
  • Welding zones 16 1 , 16 2 make it possible to connect the track to the wires 10 for supplying electrical energy. Due to the fact that the heating elements are external to the heating body 2, the connection of these soldering zones to the supply wires 10 is made without the wires passing through holes drilled in this body, which eliminates any risk of leakage from sticks through such holes.
  • the tracks 14 1 , 14 2 are formed on the faces of the substrates of the elements 13 1 , 13 2 respectively, which are turned outward, relative to the heater 2 , therefore on the faces of the substrates which are opposite to those applied against the heating body 2.
  • the substrates must then be made of a material which is a good conductor of heat (enamelled metal sheet or stainless metal sheet covered with a dielectric), MCH technology (s ubstrat m étallique sodia i) for example, so that the heat radiated by the tracks can be transmitted by conduction to the heating body, through these substrates.
  • This arrangement of the tracks of the heating elements makes it easier to electrically insulate these tracks from the heating body 2.
  • each substrate is electrically isolated by any means suitable (glass film, etc ).
  • the heating body 2 is made of a material which is a good conductor of heat, such as aluminum, injection molded, for example.
  • the heating elements 13 1 , 13 2 are pressed against the planar facets 2 1 , 2 1 opposite the external surface of the heating body 2 (only the facet 2 1 is visible in FIG. 2).
  • the heating elements are retained against these facets, in close contact, by pinching between them and thermal screens 17 1 , 17 2 .
  • the latter are themselves clamped by the two half-shells 18 1 , 18 2 of an envelope which ensures, in combination with a ring 19 slid over the end 5 of the heating body 2, the cohesion of all of the parts associated with this heating body, thanks to self-tapping assembly screws passed through pairs of complementary holes formed in these half-shells, such as those referenced 20 1 , 20 2 .
  • a temperature sensor 21 is mounted on the heating body, in contact thermal with it, to form a signal representative of the temperature of this body.
  • the sensor 20 is connected to the regulation circuit 11 to deliver to this circuit a signal representative of this temperature, this signal being necessary for regulation in a closed loop of the temperature of the mass of glue contained in the chamber 3.
  • the glue applicator according to the invention described above then operates as follows.
  • the tracks of the heating elements 13 1 , 13 2 are supplied with electric current, while a stick of thermoadhesive glue is pushed into the chamber 3 of the body 2, the heat radiated by Joule effect by the heating elements is stopped by a side by the heat shields 17 1 , 17 2 and transmitted on the other side to the heating body 2, through the substrates of these heating elements, made for example from sheet metal a few tenths of a mm thick.
  • the heat thus transmitted propagates directly and completely in the heating body, in aluminum for example, thanks to the close physical contact established between the external surface of the heating body 2 and the heating elements 13 1 , 13 2 .
  • the uniform heating established by the applicator according to the invention carries the adhesive hot-melt at the desired viscosity to allow the emission of glue by the nozzle 6, this under the temperature control developed by circuit 11.
  • Windows 22 1 , 22 2 can be provided in the half-shells 18 1 , 18 2 , respectively, to ensure ventilation of the thermal screens 17 1 , 17 2 , capable of preventing their deterioration.
  • the invention is not limited to the embodiment described and shown which has been given by way of example only. This is how the temperature could be mounted on one of the heating elements for example rather that on the heating body, the thick-film hybrid circuit lends itself to reception of discrete components. This sensor could even take the form of a temperature-dependent resistance ink track, carried directly by the substrate of a heating element.
  • Both sides of the same metal substrate could carry tracks resistive ink to increase the amount of heat radiated by the same element heating.
  • the heater could receive heating elements in a number other than 2, depending on the required heating power, for example.
  • the regulation circuit could also be replaced by the use of a ink with positive temperature coefficient, to form the resistive tracks of heating elements.
  • the substrate of the heating elements could consist of a material electrically insulating, such as alumina, less good conductor of heat than a metallic material.
  • tracks 15 1 , 15 2 could be turned towards the heating body and be duly insulated therefrom, by an overlay of glass or mica, for example.
  • heating elements could be curved rather that plane, and then be applied to conforming curved surfaces of the body heated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Surface Heating Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Resistance Heating (AREA)

Abstract

The invention relates to an applicator comprising a) an elongated chamber (3) having an opening for a glue stick and a nozzle (6) for distributing melted glue, b) means for gradually pushing the stick into the chamber (3) and c) two heating elements (131, 132), each of which comprises a channel (151, 152) made from an electrically resistant material and which can be connected to an electrical power source. Said channel (151, 152) is formed on an electrically insulated surface of a substrate (141, 142) which is arranged so as to be in thermal contact with a mass of glue contained in the chamber (3). The heating element (131, 132) is applied against an external conformal surface (21, 22) of a heating body (2), one surface of which defines said chamber (3). The heating body (2) is made from a heat-conducting material.

Description

La présente invention est relative à un applicateur de colle thermofusible et, plus particulièrement, à un tel applicateur du type décrit dans le brevet des Etats-Unis d'Amérique N° 6 142 207 cédé à SOFRAGRAF INDUSTRIES, représenté schématiquement à la figure 1 du dessin annexé, en coupe axiale.The present invention relates to an applicator of hot-melt adhesive and, more particularly, to such an applicator of the type described in the United States patent America N ° 6 142 207 sold to SOFRAGRAF INDUSTRIES, represented schematically in Figure 1 of the accompanying drawing, in axial section.

Sur cette figure il apparaít que cet applicateur prend généralement la forme d'un pistolet et comprend un carter 1 enfermant un corps de chauffe tubulaire 2 percé d'une chambre allongée 3 présentant une première extrémité 4 conformée en entrée pour un bâtonnet B de colle thermofusible et une deuxième extrémité 5 équipée d'une buse 6 de distribution de colle fondue. L'applicateur comprend encore des moyens (non représentés) conçus pour pousser progressivement le bâtonnet B de colle dans une douille 7 coaxiale à la chambre 3, puis dans cette chambre, et des moyens de chauffage électrique de la partie du bâtonnet de colle qui est poussée dans la chambre.In this figure it appears that this applicator generally takes the form a pistol and includes a casing 1 enclosing a tubular heating body 2 pierced an elongated chamber 3 having a first end 4 shaped as an inlet for a stick B of hot-melt adhesive and a second end 5 fitted with a nozzle 6 for dispensing molten glue. The applicator still includes means (not shown) designed to gradually push the stick B of glue into a socket 7 coaxial with the chamber 3, then in this chamber, and means for electric heating of the part of the glue stick which is pushed into the bedroom.

L'applicateur comprend encore une poignée 8 équipée d'une gâchette 9 permettant d'actionner les moyens de poussée du bâtonnet, ces moyens pouvant être constitués, par exemple, par une transmission mécanique à bielles ou crémaillère, comme cela est bien connu.The applicator also includes a handle 8 equipped with a trigger 9 for actuating the pushing means of the stick, these means being able to be constituted, for example, by a mechanical transmission with rods or rack, as is well known.

Les moyens de chauffage électrique de la masse de colle contenue dans la chambre 3 sont alimentés par des fils électriques 10 raccordés à un bornier 111 d'un circuit 11 de régulation de l'alimentation de ces moyens de chauffage. Le circuit 11 est lui-même alimenté en énergie électrique par un câble 12 connecté d'une part à un bornier 112 du circuit 11 et d'autre part au réseau. En variante le circuit 11 pourrait aussi être alimenté par une batterie d'accumulateurs, interne ou externe à l'applicateur.The means of electric heating of the mass of adhesive contained in the chamber 3 are supplied by electric wires 10 connected to a terminal block 11 1 of a circuit 11 for regulating the supply of these heating means. The circuit 11 is itself supplied with electrical energy by a cable 12 connected on the one hand to a terminal block 11 2 of the circuit 11 and on the other hand to the network. As a variant, the circuit 11 could also be supplied by a storage battery, internal or external to the applicator.

Suivant le brevet des Etats-Unis d'Amérique précité, les moyens de chauffage comprennent un ou plusieurs éléments chauffants constitués chacun par une piste en un matériau électriquement résistant et munie de moyens de connexion à une source d'énergie électrique, cette piste étant formée sur une surface électrique isolante d'un substrat agencé de manière à être en contact thermique avec la masse de colle contenue dans la chambre 3.According to the aforementioned United States patent, the heating means include one or more heating elements each consisting of a track in an electrically resistant material provided with means for connection to a source of electrical energy, this track being formed on an electrical insulating surface of a substrate arranged to be in thermal contact with the adhesive mass contained in room 3.

Un tel élément chauffant plan peut être réalisé à l'aide de moyens utilisés pour la fabrication de circuits hybrides à couche épaisse, dont on sait qu'ils sont constitués d'un substrat en alumine, en tôle émaillée ou en tôle inoxydable par exemple, recouvert d'un diélectrique, le substrat recevant par sérigraphie une piste formée d'une pâte qui, après séchage, constitue une "encre" résistive propre à chauffer une masse de colle adjacente par effet Joule et conduction thermique, lorsqu'elle est traversée par un courant électrique.Such a flat heating element can be produced using means used to the manufacture of thick-film hybrid circuits, of which we know that they are made an alumina substrate, enamelled sheet or stainless sheet for example, covered with a dielectric, the substrate receiving by screen printing a track formed of a paste which, after drying, constitutes a resistive "ink" capable of heating a mass of adjacent glue by Joule effect and thermal conduction, when crossed by a Electric power.

Les éléments chauffants ainsi constitués présentent de nombreux avantages sur les moyens de chauffage électrique classiquement utilisés dans les applicateurs de colle thermofusibles. Leur montée en température est très rapide, du fait de leur faible inertie thermique. Leur puissance de chauffe, par unité de surface, est très élevée. En outre la sérigraphie autorise une grande variété dans le dessin des pistes. L'adaptation de tels éléments chauffants à des besoins spécifiques ou nouveaux en est ainsi facilitée.The heating elements thus formed have many advantages on the electric heating means conventionally used in the applicators of hot melt glue. Their temperature rise is very rapid, due to their low thermal inertia. Their heating power, per unit area, is very high. In besides the serigraphy allows a great variety in the design of the tracks. adaptation such heating elements for specific or new needs is so facilitated.

Le brevet précité décrit divers modes de réalisation d'un applicateur de colle thermofusible équipé de tels éléments chauffants, dans lesquels ceux-ci tapissent tout ou partie de la paroi de la chambre 3, de manière à établir un contact thermique optimal avec la masse de colle contenue dans cette chambre. Le corps de chauffe 2 est alors réalisé avec un matériau constituant un isolant thermique.The aforementioned patent describes various embodiments of an adhesive applicator hot-melt equipped with such heating elements, in which these line everything or part of the wall of chamber 3, so as to establish thermal contact optimal with the mass of glue contained in this chamber. The heater 2 is then made with a material constituting a thermal insulator.

Cette disposition des éléments chauffants présente néanmoins des inconvénients. Outre qu'ils sont alors d'installation incommode, leur alimentation électrique exige des perçages du corps de chauffe pour le passage des fils d'alimentation, perçages qui peuvent être à l'origine de fuites de colle, notamment quand les fils traversent également le substrat de l'élément chauffant. Quand celui-ci est réalisé en un matériau métallique, le passage de ces fils pose en outre des problèmes d'isolation électrique de ces fils par rapport au substrat. Enfin, quand les pistes sérigraphiées font face à la masse de colle contenue dans la chambre 3, il faut veiller à ce que les points de soudure raccordant les fils électriques d'alimentation aux pistes ne gênent pas la progression de cette masse de colle dans la chambre.This arrangement of the heating elements nevertheless presents disadvantages. Besides being inconvenient to install, their diet electric requires drilling of the heating body for the passage of the wires supply, holes which can cause glue leaks, in particular when the wires also pass through the substrate of the heating element. When this one is made of a metallic material, the passage of these wires also poses electrical insulation problems of these wires with respect to the substrate. Finally, when the screen-printed tracks face the mass of glue contained in chamber 3, it is necessary ensure that the solder points connecting the electrical supply wires to the tracks do not hinder the progression of this mass of glue in the chamber.

La présente invention a donc pour but de réaliser un applicateur de colle thermofusible qui ne présente pas les inconvénients évoqués ci-dessus et qui, en particulier, comprennent un corps de chauffe parfaitement étanche vis-à-vis de la colle fondue, l'installation des éléments chauffants étant elle-même rendue très facile.The object of the present invention is therefore to produce an adhesive applicator hot-melt which does not have the drawbacks mentioned above and which, in particular, include a perfectly sealed heating body vis-à-vis the adhesive melted, the installation of the heating elements being made very easy.

On atteint ces buts de l'invention, ainsi que d'autres qui apparaítront à la lecture de la description qui va suivre, avec un applicateur de colle thermofusible comprenant a) une chambre allongée présentant une première extrémité conformée en entrée pour un bâtonnet de ladite colle thermofusible et une deuxième extrémité équipée d'une buse de distribution de colle fondue, b) des moyens pour pousser progressivement le bâtonnet dans la chambre et c) des moyens de chauffage électrique de la partie du bâtonnet contenue dans la chambre, comprenant au moins un élément chauffant constitué par au moins une piste en un matériau électriquement résistant et munie de moyens de connexion à une source d'énergie électrique, cette piste étant formée sur une surface électriquement isolée d'un substrat agencé de manière à être en contact thermique avec une masse de colle contenue dans la chambre. L'applicateur est remarquable en ce que l'élément chauffant est étroitement appliqué contre une facette extérieure conforme d'un corps de chauffe dont une surface intérieure délimite la chambre, le corps de chauffe étant réalisé en un matériau conducteur de la chaleur.These objects of the invention are achieved, as well as others which will appear on reading of the description which follows, with a hot-melt adhesive applicator comprising a) an elongated chamber having a first end shaped as entry for a stick of said hot-melt adhesive and a second end equipped with a molten glue distribution nozzle, b) means for pushing gradually the stick in the room and c) means of electric heating the part of the stick contained in the chamber, comprising at least one element heater consisting of at least one track made of an electrically resistant material and provided with means of connection to a source of electrical energy, this track being formed on an electrically insulated surface of a substrate arranged to be in thermal contact with a mass of glue contained in the chamber. The applicator is remarkable in that the heating element is tightly applied against a conforming external facet of a heating body including a surface interior delimits the chamber, the heating body being made of a material conductor of heat.

Comme on le verra plus loin en détail, en disposant ainsi le ou les éléments chauffants de l'applicateur, on maintient un contact thermique excellent entre ces éléments et la masse de colle à chauffer, à travers la matière thermoconductrice du corps de chauffe, tout en supprimant toute traversée de ce corps par des fils d'alimentation électrique des éléments chauffants, et donc toute fuite possible de colle. En outre, la position des éléments chauffants contre la surface extérieure du corps de chauffe, rend leur installation très aisée.As will be seen below in detail, thus arranging the element or elements applicator heaters, excellent thermal contact is maintained between these elements and the mass of glue to be heated, through the thermally conductive material of the heating body, while eliminating any crossing of this body by wires power supply to the heating elements, and therefore any possible glue leakage. In addition, the position of the heating elements against the outer surface of the body heats up, makes their installation very easy.

Suivant d'autres caractéristiques de l'applicateur de colle thermofusible selon l'invention, le substrat peut être un substrat métallique isolé. Dans ce cas la piste formée sur le substrat peut être disposée sur la face de ce substrat qui est opposée à celle appliquée contre le corps de chauffe. L'élément chauffant peut aussi comporter au moins deux pistes en un matériau électriquement résistant, disposées chacune sur une des deux faces du substrat de cet élément.According to other characteristics of the hot-melt adhesive applicator according to the invention, the substrate can be an isolated metal substrate. In this case the track formed on the substrate can be arranged on the face of this substrate which is opposite that applied against the heating body. The heating element may also include at least two tracks of an electrically resistant material, each arranged on one of the two faces of the substrate of this element.

Le substrat de l'élément chauffant peut aussi être constitué en un matériau électriquement isolant.The substrate of the heating element can also be made of a material electrically insulating.

D'autres caractéristiques et avantages de l'applicateur de colle suivant la présente invention apparaítront à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel :

  • la figure 1 est une vue schématique, en coupe axiale, de l'applicateur de colle thermofusible suivant l'invention, dont les dispositions connues sont décrites en préambule de la présente description, et
  • la figure 2 est une vue partielle éclatée de l'applicateur de la figure 1, faisant apparaítre le corps de chauffe de cet applicateur et divers organes qui lui sont associés.
Other characteristics and advantages of the adhesive applicator according to the present invention will appear on reading the description which follows and on examining the appended drawing in which:
  • FIG. 1 is a schematic view, in axial section, of the hot-melt adhesive applicator according to the invention, the known arrangements of which are described in the preamble to this description, and
  • Figure 2 is a partial exploded view of the applicator of Figure 1, showing the heating body of this applicator and various bodies associated with it.

On retrouve sur la figure 2 des organes représentés sur la figure 1, à savoir le corps de chauffe 2 percé de la chambre 3 et prolongé à une extrémité par la buse 6 et, à l'autre extrémité, par la douille 7.We find in Figure 2 organs shown in Figure 1, namely the heating body 2 pierced from the chamber 3 and extended at one end by the nozzle 6 and, at the other end, by the socket 7.

Le corps de chauffe 2 présente une surface extérieure conformée pour recevoir, en contact étroit, deux éléments chauffants 131, 132 sur deux facettes planes opposées 21, 22 de cette surface extérieure (seule la facette 21 est visible sur la figure 2). Une surface intérieure du corps de chauffe délimite la chambre 3.The heating body 2 has an external surface shaped to receive, in close contact, two heating elements 13 1 , 13 2 on two opposite flat facets 2 1 , 2 2 of this external surface (only the facet 2 1 is visible in the figure 2). An interior surface of the heating body delimits the chamber 3.

Les deux éléments chauffants sont identiques et sont constitués chacun d'un substrat 141, 142 recouverts, sur au moins une face, d'une piste sérigraphiée telle que la piste 151 visible sur le substrat 141 de l'élément chauffant 131.The two heating elements are identical and each consist of a substrate 14 1 , 14 2 covered, on at least one face, with a screen-printed track such as track 15 1 visible on the substrate 14 1 of the heating element 13 1 .

Ces éléments chauffants sont du type de ceux décrits dans le brevet des Etats-Unis d'Amérique précité, formés d'un substrat plan garni par sérigraphie d'une pâte ou "encre" résistive dessinant la piste 151, suivant la technologie utilisée pour réaliser des circuits hybrides à couche épaisse. On pourra d'ailleurs se reporter au brevet des Etats-Unis d'Amérique précité pour plus de détails concernant les matériaux propres à constituer le substrat et les pistes des éléments chauffants.These heating elements are of the type described in the aforementioned United States patent, formed of a planar substrate packed by screen printing with a resistive paste or "ink" drawing the track 15 1 , according to the technology used for make thick-film hybrid circuits. Reference may also be made to the aforementioned United States patent for more details on the materials suitable for constituting the substrate and the tracks of the heating elements.

Des zones de soudure 161, 162 permettent de raccorder la piste aux fils 10 d'alimentation en énergie électrique. Du fait que les éléments chauffants sont extérieurs au corps de chauffe 2, le raccordement de ces zones de soudure aux fils d'alimentation 10 se fait sans passage des fils à travers des trous percés dans ce corps, ce qui élimine tout risque de fuite de colle par de tels trous.Welding zones 16 1 , 16 2 make it possible to connect the track to the wires 10 for supplying electrical energy. Due to the fact that the heating elements are external to the heating body 2, the connection of these soldering zones to the supply wires 10 is made without the wires passing through holes drilled in this body, which eliminates any risk of leakage from sticks through such holes.

Sur la vue éclatée de la figure 2, il apparaít que les pistes 141, 142 sont formées sur les faces des substrats des éléments 131, 132 respectivement, qui sont tournées vers l'extérieur, par rapport au corps de chauffe 2, donc sur les faces des substrats qui sont opposées à celles appliquées contre le corps de chauffe 2. Les substrats doivent alors être réalisés en un matériau bon conducteur de la chaleur, (tôle métallique émaillée ou tôle métallique inoxydable recouverte d'un diélectrique), en technologie SMI (de substrat métallique isolé) par exemple, de manière que la chaleur rayonnée par les pistes puisse se transmettre par conduction au corps de chauffe, à travers ces substrats. Cette disposition des pistes des éléments chauffants rend plus facile l'isolation électrique de ces pistes vis-à-vis du corps de chauffe 2.In the exploded view of Figure 2, it appears that the tracks 14 1 , 14 2 are formed on the faces of the substrates of the elements 13 1 , 13 2 respectively, which are turned outward, relative to the heater 2 , therefore on the faces of the substrates which are opposite to those applied against the heating body 2. The substrates must then be made of a material which is a good conductor of heat (enamelled metal sheet or stainless metal sheet covered with a dielectric), MCH technology (s ubstrat m étallique solé i) for example, so that the heat radiated by the tracks can be transmitted by conduction to the heating body, through these substrates. This arrangement of the tracks of the heating elements makes it easier to electrically insulate these tracks from the heating body 2.

Les deux faces de chaque substrat sont isolées électriquement par tout moyen convenable (film de verre, etc...).The two faces of each substrate are electrically isolated by any means suitable (glass film, etc ...).

Le corps de chauffe 2 est réalisé en un matériau bon conducteur de la chaleur, tel que de l'aluminium, moulé par injection, par exemple.The heating body 2 is made of a material which is a good conductor of heat, such as aluminum, injection molded, for example.

Les éléments chauffants 131, 132 sont plaqués sur les facettes planes 21, 21 en regard de la surface extérieure de corps de chauffe 2 (seule la facette 21 est visible sur la figure 2). Les éléments chauffants sont retenus contre ces facettes, en contact étroit, par pinçage entre celles-ci et des écrans thermiques 171, 172. Ces derniers sont eux-mêmes serrés par les deux demi-coquilles 181, 182 d'une enveloppe qui assure, en combinaison avec une bague 19 glissée sur l'extrémité 5 du corps de chauffe 2, la cohésion de l'ensemble des pièces associées à ce corps de chauffe, grâce à des vis d'assemblage autotaraudeuses passées dans des paires de trous complémentaires formés dans ces demi-coquilles, tels que ceux référencés 201, 202.The heating elements 13 1 , 13 2 are pressed against the planar facets 2 1 , 2 1 opposite the external surface of the heating body 2 (only the facet 2 1 is visible in FIG. 2). The heating elements are retained against these facets, in close contact, by pinching between them and thermal screens 17 1 , 17 2 . The latter are themselves clamped by the two half-shells 18 1 , 18 2 of an envelope which ensures, in combination with a ring 19 slid over the end 5 of the heating body 2, the cohesion of all of the parts associated with this heating body, thanks to self-tapping assembly screws passed through pairs of complementary holes formed in these half-shells, such as those referenced 20 1 , 20 2 .

Un capteur de température 21 est monté sur le corps de chauffe, en contact thermique avec celui-ci, pour former un signal représentatif de la température de ce corps. Le capteur 20 est raccordé au circuit de régulation 11 pour délivrer à ce circuit un signal représentatif de cette température, ce signal étant nécessaire à la régulation en boucle fermée de la température de la masse de colle contenue dans la chambre 3.A temperature sensor 21 is mounted on the heating body, in contact thermal with it, to form a signal representative of the temperature of this body. The sensor 20 is connected to the regulation circuit 11 to deliver to this circuit a signal representative of this temperature, this signal being necessary for regulation in a closed loop of the temperature of the mass of glue contained in the chamber 3.

L'applicateur de colle suivant l'invention décrit ci-dessus fonctionne alors comme suit. Lorsque les pistes des éléments chauffants 131, 132 sont alimentés en courant électrique, alors qu'un bâtonnet de colle thermoadhésif est poussé dans la chambre 3 du corps 2, la chaleur rayonnée par effet Joule par les éléments chauffants est arrêtée d'un côté par les écrans thermiques 171, 172 et transmise de l'autre côté au corps de chauffe 2, à travers les substrats de ces éléments chauffants, réalisés par exemple en tôle métallique de quelques dixièmes de mm d'épaisseur. La chaleur ainsi transmise se propage directement et complètement dans le corps de chauffe, en aluminium par exemple, grâce au contact physique étroit établi entre la surface extérieure du corps de chauffe 2 et les éléments chauffants 131, 132.The glue applicator according to the invention described above then operates as follows. When the tracks of the heating elements 13 1 , 13 2 are supplied with electric current, while a stick of thermoadhesive glue is pushed into the chamber 3 of the body 2, the heat radiated by Joule effect by the heating elements is stopped by a side by the heat shields 17 1 , 17 2 and transmitted on the other side to the heating body 2, through the substrates of these heating elements, made for example from sheet metal a few tenths of a mm thick. The heat thus transmitted propagates directly and completely in the heating body, in aluminum for example, thanks to the close physical contact established between the external surface of the heating body 2 and the heating elements 13 1 , 13 2 .

Grâce à la forte conductivité thermique de ce corps en aluminium, la chaleur transmise se répartit tout autour de la masse de colle contenue dans la chambre 3, en assurant ainsi un chauffage uniforme de toutes les parties de celle-ci.Thanks to the high thermal conductivity of this aluminum body, the heat transmitted is distributed all around the mass of glue contained in chamber 3, in thus ensuring uniform heating of all parts thereof.

C'est là un avantage supplémentaire de l'applicateur de colle suivant l'invention. En effet, dans celui décrit au brevet des U.S.A. précité, les éléments chauffants chauffent essentiellement les parties de la colle placées à leur contact, la chaleur ainsi transmise diffusant difficilement du fait de la mauvaise conductibilité thermique de la colle.This is an additional advantage of the following glue applicator the invention. Indeed, in that described in the aforementioned U.S. patent, the elements heaters essentially heat the parts of the glue placed in contact with them, the heat thus transmitted difficult to diffuse due to poor conductivity thermal glue.

Le chauffage uniforme établi par l'applicateur suivant l'invention porte la colle thermofusible à la viscosité souhaitée pour permettre l'émission de colle par la buse 6, ceci sous le contrôle en température développé par le circuit 11.The uniform heating established by the applicator according to the invention carries the adhesive hot-melt at the desired viscosity to allow the emission of glue by the nozzle 6, this under the temperature control developed by circuit 11.

Des fenêtres 221, 222 peuvent être prévues dans les demi-coquilles 181, 182, respectivement, pour assurer une aération des écrans thermiques 171, 172, propre à prévenir leur altération.Windows 22 1 , 22 2 can be provided in the half-shells 18 1 , 18 2 , respectively, to ensure ventilation of the thermal screens 17 1 , 17 2 , capable of preventing their deterioration.

Il apparaít maintenant que la présente invention permet bien d'atteindre les buts annoncés, à savoir assurer un chauffage efficace du corps de chauffe et donc de la colle avec des éléments chauffants du type "circuit hybride à couche épaisse" agencés de manière à éviter tout perçage du corps de chauffe et à faciliter leur installation sur celui-ci.It now appears that the present invention does indeed achieve the stated goals, namely to ensure efficient heating of the heating body and therefore of glue with "thick film hybrid circuit" type heating elements arranged so as to avoid any piercing of the heating element and to facilitate their installation on it.

Bien entendu l'invention n'est pas limitée au mode de réalisation décrit et représenté qui n'a été donné qu'à titre d'exemple. C'est ainsi que le capteur de température pourrait être monté sur l'un des éléments chauffants par exemple, plutôt que sur le corps de chauffe, le circuit hybride à couche épaisse se prêtant à la réception de composants discrets. Ce capteur pourrait même prendre la forme d'une piste d'encre à résistance fonction de la température, portée directement par le substrat d'un élément chauffant.Of course, the invention is not limited to the embodiment described and shown which has been given by way of example only. This is how the temperature could be mounted on one of the heating elements for example rather that on the heating body, the thick-film hybrid circuit lends itself to reception of discrete components. This sensor could even take the form of a temperature-dependent resistance ink track, carried directly by the substrate of a heating element.

Les deux faces d'un même substrat métallique pourraient porter des pistes d'encre résistive pour accroítre la quantité de chaleur rayonnée par un même élément chauffant.Both sides of the same metal substrate could carry tracks resistive ink to increase the amount of heat radiated by the same element heating.

Le corps de chauffe pourrait recevoir des éléments chauffants en un nombre différent de 2, fonction de la puissance de chauffe requise, par exemple.The heater could receive heating elements in a number other than 2, depending on the required heating power, for example.

Le circuit de régulation pourrait aussi être remplacé par l'utilisation d'une encre à coefficient de température positif, pour constituer les pistes résistives des éléments chauffants.The regulation circuit could also be replaced by the use of a ink with positive temperature coefficient, to form the resistive tracks of heating elements.

Le substrat des éléments chauffants pourrait être constitué par un matériau électriquement' isolant, tel que de l'alumine, moins bonne conductrice de la chaleur qu'un matériau métallique.The substrate of the heating elements could consist of a material electrically insulating, such as alumina, less good conductor of heat than a metallic material.

Dans ce cas les pistes 151, 152 pourraient être tournées vers le corps de chauffe et être dûment isolées de celui-ci, par une surcouche de verre ou de mica, par exemple.In this case the tracks 15 1 , 15 2 could be turned towards the heating body and be duly insulated therefrom, by an overlay of glass or mica, for example.

Egalement les éléments chauffants pourraient être de forme incurvée plutôt que plane, et être alors appliqués sur des surfaces incurvées conformes du corps de chauffe.Also the heating elements could be curved rather that plane, and then be applied to conforming curved surfaces of the body heated.

Claims (10)

  1. A hot melt glue applicator comprising a) an elongate chamber (3) having a first end (4) conformed as an inlet for a stick (B) of said hot melt glue and a second end (5) equipped with a nozzle (6) for dispensing molten glue, b) means for progressively pushing said stick (B) into said chamber (3), and c) electrical means for heating the portion of the stick (B) contained in the chamber (3), said heating means comprising at least one heating element (131, 132) consisting of at least one track (151, 152) of an electrically resistive material and provided with means (161, 162) for connecting it to an electrical power supply, said track (151, 152) being formed on an electrically insulative surface of a substrate (141, 142), said substrate being adapted to be in thermal contact with a mass of glue contained in said chamber (3),
       which applicator is characterized in that said heating element (131, 132) is pressed tightly against a conformal exterior facet (21, 22) of a heating body (2) an interior surface of which delimits said chamber (3), said heating body (2) being made from a thermally conductive material.
  2. An applicator according to claim 1, characterized in that said substrate (141, 142) is an insulated metal substrate.
  3. An applicator according to claim 2, characterized in that the track (151, 152) formed on said substrate (141, 142) is disposed on the face of said substrate opposite that pressed against said heating body (2).
  4. An applicator according to any one of claims 1 to 3, characterized in that said heating element (131, 132) includes at least two electrically resistive material tracks each disposed on one of the two faces of the substrate of the heating element (131, 132).
  5. An applicator according to claim 1, characterized in that said substrate (141, 142) is made from an electrically insulative material.
  6. An applicator according to any one of claims 1 to 5, characterized in that the material constituting the resistive track or tracks has a positive temperature coefficient.
  7. An applicator according to any one of claims 1 to 6, characterized in that it includes electronic means (11) for regulating the temperature of the heated mass of glue.
  8. An applicator according to claim 7, characterized in that it includes a sensor for sensing the temperature of said heating body (2) to deliver a signal representative of said temperature to said regulation means (11).
  9. An applicator according to claim 8, characterized in that said sensor is disposed on the substrate (141, 142) of said heating element (131, 132).
  10. An applicator according to any one of claims 1 to 9, characterized in that the resistive track (151, 152) carried by each heating element (131, 132) is made by screenprinting a resistive paste onto the substrate (141, 142) using the thick film hybrid circuit fabrication technology.
EP02701360A 2001-02-02 2002-01-31 Thermofusible glue applicator Expired - Lifetime EP1355744B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0101422A FR2820346B1 (en) 2001-02-02 2001-02-02 APPLICATOR OF HEAT-MELT ADHESIVE
FR0101422 2001-02-02
PCT/FR2002/000369 WO2002062491A1 (en) 2001-02-02 2002-01-31 Thermofusible glue applicator

Publications (2)

Publication Number Publication Date
EP1355744A1 EP1355744A1 (en) 2003-10-29
EP1355744B1 true EP1355744B1 (en) 2004-12-08

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Application Number Title Priority Date Filing Date
EP02701360A Expired - Lifetime EP1355744B1 (en) 2001-02-02 2002-01-31 Thermofusible glue applicator

Country Status (8)

Country Link
US (1) US6838642B2 (en)
EP (1) EP1355744B1 (en)
CN (1) CN1280026C (en)
AT (1) ATE284277T1 (en)
DE (1) DE60202194T2 (en)
ES (1) ES2235006T3 (en)
FR (1) FR2820346B1 (en)
WO (1) WO2002062491A1 (en)

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Publication number Priority date Publication date Assignee Title
US20060081650A1 (en) * 2004-10-13 2006-04-20 Hyperion Innovations, Inc. Glue dispensing apparatus
US20060191957A1 (en) * 2004-10-13 2006-08-31 Hyperion Innovations Inc. Glue dispensing apparatus
US20060127548A1 (en) * 2004-12-10 2006-06-15 Hideko Nakanishi Apparatus and method for dispensing a softened edible substance for decorating foodstuffs
US20070012746A1 (en) * 2005-07-18 2007-01-18 Chien-Yen Lu Heating type accelerator for soldering paste
US10369590B2 (en) * 2016-03-10 2019-08-06 Acme United Corporation Glue gun
CN106111370A (en) * 2016-06-27 2016-11-16 广东古帆装饰工程有限公司 A kind of heated nozzle of hot melt gun
CN107159530A (en) * 2017-06-16 2017-09-15 奉化市威优特电器有限公司 A kind of heater of thermosol gelgun
CN108355925B (en) * 2018-05-03 2023-09-12 宁波赤菟科技有限公司 Glue gun heating device
CN108889571A (en) * 2018-08-30 2018-11-27 浙江仕善汽车科技股份有限公司 It is a kind of can uniformly plastic emitting automobile glue rifle
CN220781026U (en) * 2023-04-28 2024-04-16 庄广祥 Melta Gun
US12479001B2 (en) * 2023-09-01 2025-11-25 Jingrong Ye Electric hot melt glue pen

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US4032046A (en) * 1976-11-01 1977-06-28 Usm Corporation Apparatus for feeding glue to a hot melt glue dispensing appliance
EP0055350A3 (en) * 1980-12-29 1982-09-08 Steinel GmbH & Co. KG Device for fluidifying a fusible glue
MC1432A1 (en) * 1981-09-29 1982-12-06 Innovation Tech APPARATUS FOR APPLYING A HOT-MELT ADHESIVE
FR2565131B1 (en) * 1984-06-05 1987-09-04 Sofragraf APPLICATOR OF A MOLTEN PRODUCT, SUCH AS A HOT-MELT GLUE OR SOLDER
US4938388A (en) * 1989-05-05 1990-07-03 Future Co., Ltd. Glue transport mechanism for a molten glue discharging device
FR2759925B1 (en) 1997-02-21 1999-05-14 Sofragraf Ind APPLICATOR OF HEAT-MELT ADHESIVE AND ADHESIVE STICK DESIGNED TO SUPPLY SUCH AN APPLICATOR
ATE231746T1 (en) * 1999-03-05 2003-02-15 Steinel Gmbh & Co Kg HEAT ADHESIVE DEVICE
US6376816B2 (en) * 2000-03-03 2002-04-23 Richard P. Cooper Thin film tubular heater

Also Published As

Publication number Publication date
FR2820346B1 (en) 2003-04-18
DE60202194D1 (en) 2005-01-13
ATE284277T1 (en) 2004-12-15
WO2002062491A1 (en) 2002-08-15
CN1489495A (en) 2004-04-14
US6838642B2 (en) 2005-01-04
EP1355744A1 (en) 2003-10-29
US20040060665A1 (en) 2004-04-01
ES2235006T3 (en) 2005-07-01
DE60202194T2 (en) 2005-05-19
FR2820346A1 (en) 2002-08-09
CN1280026C (en) 2006-10-18

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