EP2990171B1 - Procédé et dispositif pour thermo-fusion localisée - Google Patents

Procédé et dispositif pour thermo-fusion localisée Download PDF

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Publication number
EP2990171B1
EP2990171B1 EP15179806.3A EP15179806A EP2990171B1 EP 2990171 B1 EP2990171 B1 EP 2990171B1 EP 15179806 A EP15179806 A EP 15179806A EP 2990171 B1 EP2990171 B1 EP 2990171B1
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EP
European Patent Office
Prior art keywords
edging
elliptical
elliptical mirror
edging strip
strip
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.)
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Application number
EP15179806.3A
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German (de)
English (en)
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EP2990171A1 (fr
Inventor
Giuseppe Pritelli
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.)
GP Consulting Di Giuseppe Pritelli & C Sas
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GP Consulting Di Giuseppe Pritelli & C Sas
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Publication of EP2990171A1 publication Critical patent/EP2990171A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/003—Other working of veneer or plywood specially adapted to veneer or plywood securing a veneer strip to a panel edge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/032—Heaters specially adapted for heating by radiation heating

Definitions

  • the invention refers to a method for localised thermal-melting for thermo-activating the adhesive face of an edging strip for continuously joining an edging strip on the edge of a panel and to a device for implementing such method according to the preambles of claim 1 and 3 respectively, known from WO 2009/026977 .
  • the edging technique i.e. the perimeter application - on the thicknesses of wooden or, more often, surrogate wooden panels - of strips made of coating material for the quality enhancement and/or only covering/decorative purposes, made of various materials, is known in the furnishing industry.
  • these strips of coating material are made of synthetic material webs, continuously applied by automatic machines, the so-called edging machines, which unwind the strip from reels, cut it into suitable segments to suit the panel perimeter, apply bonding material thereon on a face or activate the bonding material already pre-existent and make it adhere on the perimeter with respect to the panel, precisely at the thickness of the relative edge, unless in case of subsequent filing.
  • these strips of edging material are made of polymeric strip material, usually polypropylene, made of one component but obtained in two co-extruded layers differentiated by the melting point: the layer intended to be exposed to view in the finished product has a higher melting point, while the inner layer has a lower melting point, so as to be more suitable to be thermo welded, in solidification, to the edge of the panels without need for further resins and/or bonding agents.
  • thermo activation of the meltable face of polymeric edging webs thus made requires considerable heat, which, according to the prior art, is attained through laser beams, spread on the inner face of the strip through vibrating mirrors, or through optical cylinders.
  • GB 1 477 196 discloses a process and an apparatus for metallising sheet-like substrates.
  • thermo activation systems of polymeric edging webs thus made reveal considerable drawbacks and limits in terms of high costs of purchase and management of the laser beam generators, as well as in terms of risks to the physical safety of the operators, also considering the well known risks that may arise from high power laser beams.
  • the main object of the present invention is that of providing an innovative system for the thermo-activation of the bonding face of the edging strips in the furnishing industry, especially the meltable face of the one-component polymeric strips coextruded in two layers with differentiated melting point, so as to be efficient and feasible in the functions as well as easily applicable to the existent production lines, without revealing drawbacks, contraindications or inconveniences in terms of costs and safety.
  • Another object of the present invention is to attain the preceding object through a polyvalent system in terms of the dimension of the strip, adjustable according to the dispensable heat, low in terms of consumption and energy dispersion, modular in terms of application alternatives, simple in terms of maintenance and interchangeability, which can also be adapted to pre-existing systems and not explicitly conceived or designed to receive it.
  • a further object of the present invention is to attain the preceding objects through a simple and efficient system, that is safe in the operation and relatively low costs considering the results practically obtained therewith.
  • an embodiment of the device 1 for localised thermo-melting comprises a body for example metallic 2, substantially parallelepiped-shaped in the illustrated embodiment, within which there is obtained a cavity 3, describing an elliptical-shaped semi-cylinder with mirror surface, hereinafter also referred to as elliptical mirror 3, cut parallel to the generatrices for planar cutting on a face of the parallelepiped-shaped body 2, substantially adjacent in the axis of one of its two geometric focuses F2 (also see figure 2 ), thus obtaining said focus F2 slightly external with respect to the elliptical mirror 3.
  • the surface of the elliptical mirror 3 is preferably obtained with polished coating, in turn covered by a material capable of guaranteeing maximum reflection with respect to thermal radiation, for example gold.
  • a plug 4 for generating suitably supplied infrared rays whose fixed emission active segment preferably extends over the entire height of the elliptical mirror 3; it is fixed to a basement bracket 5, to which there is also fixed the parallelepiped-shaped body 2, for example by means of two pins 6 preferably ceramic pins.
  • variable emission plug 4 whose active segment is defined by an elastic gripper element 4A carried by a mobile electrode 4B
  • the parallelepiped-shaped body 2 preferably has a plurality of external cooling fins 7 and thus it may be exposed to a forced air flow which, through channels (not illustrated), may also be driven to carry, in slight positive pressurisation, the internal compartment of the parallelepiped-shaped body 2, i.e. elliptical mirror 3; the cooling may also be of the liquid type, thus hereinafter for the alternative embodiments.
  • the edging strip 9 is advanced and driven, like in the prior art, by batteries of driven and idle rollers 11, which, downstream of the device for localised thermo-melting 1 according to the present invention, lead it to converge and thus press it on the edges 12 of wood or wood surrogate panels 13 carried to transit in succession by a conveyor 14, for continuous joining therewith according to the prior art, for the functions to be specified hereinafter.
  • the edging strip 9 is of the one-component polymeric type, usually polypropylene, obtained in two co-extruded layers differentiated by melting point: the layer intended to be exposed to view in the finished product has a higher melting point, while the inner layer has a lower melting point, so as to be more suitable to be thermo welded, in solidification, to the edge 12 of the panels 13 without need for further resins and/or bonding agents.
  • the edging strip 9 should be unwound from a supply reel, not illustrated, and advanced on a path by rollers 11 of the known type.
  • the edging strip 9 when the edging strip 9 reaches before the device for localised thermo-melting 1, its pitch occurs substantially at the second focus F2 of the elliptical mirror 3, externally but immediately adjacent to the elliptical mirror 3.
  • the heat radiation emitted by the plug 4, or any other source of 360° infrared radiation suitably shaped for the purpose arranged on the axis of the first focus F1 impacts the meltable face of the strip 9 with direct radiation on an angle ⁇ determined by the interspace between the edges of the planar cutting on the open face of the parallelepiped-shaped body 2 (particularly see figures 1 and 2 ).
  • This combined direct and indirect flow of infrared rays transfers from the first focus F1, i.e. from the source of heat 4, to the second focus F2, i.e. to the surface of the strip 9, about 90% of the heat energy generated by said source 4, which, if of suitable power, easily obtains the thermo-melting of the meltable face of the edging strip 2, i.e. the activation of the bonding face, without any contacts or adverse effects whatsoever in terms of safety and energy costs which are absolutely acceptable, even in terms of reducing dispersion.
  • the edging strip 2 with internal surface thus may thus continue its movement, according to the prior art, to be driven adjacent to the edges 12 of the panels 13 and pressed thereon by the special rollers 11 to adhere - by interstitial penetration of the polymeric resin after the cooling and solidification of the molten face.
  • the heat absorbed by the metal body 2, where the elliptical mirror 3 is provided, may be dissipated through fins 7, possibly with the help with a source of airflow of the known type.
  • This flow may be advantageously channelled into the elliptical mirror 3 to maintain the relative environment with slight positive pressure, so as to evacuate the stagnation of possible fumes.
  • the localised thermo-melting device may be provided with a hinging element and which can be diverged through operative positioning, possibly with the part of the rollers adjacent thereto, or removable from the seat thereof for easy cleaning interventions against sedimentation of fumes and replacement of the entire device and its components.
  • the device for localised thermo-melting according to the present invention may be alternatively implemented through equivalent technical and mechanical elements, by means of devices possibly complemented by further integrative solutions, still falling within the solution concept illustrated above and claimed below.
  • the method and device for localised thermo-melting according to the present invention offers advantages corresponding to the attainment of these and other preset objects: as a matter of fact it integrates a functional, modular, polyvalent and safe method and device (with reference to the safety standards of the machines of the industry) suitable for the thermo-activation of the bonding surfaces of the edging strips especially in the furniture industry, which can also be adapted to pre-existing and operating systems even not explicitly designed to receive them.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Claims (9)

  1. Procédé pour la fusion thermique locale pour l'activation thermique de la surface adhésive d'une bande de chant (9) pour l'assembler en continu avec le bord (12) d'un panneau (13) en bois ou en succédané du bois dans un système automatique de placage des chants (1) pour la fabrication industrielle de meubles, dans lequel la bande de chant (9) est de type copolymère monocomposant avec deux couches extrudées conjointement avec différents points de fusion, l'une couche avec un point de fusion plus élevé constitue la surface visible du produit fini, alors que la couche avec un point de fusion plus faible - une surface intérieure fusible - est adaptée à l'assemblage avec le bord (12) du panneau (13) sans utiliser d'autre résine synthétique ou colle, caractérisé en ce qu'un générateur créant un rayonnement thermique (4) est positionné dans l'un des deux axes focaux (F1) d'un miroir semi-cylindrique elliptique (3), alors que l'autre axe focal (F2) se trouve en dehors du miroir elliptique (3) dans la fente de passage (8) pour la bande de chant (9), qui traverse le système de placage des chants (1) puis est pressé contre le bord (12) du panneau (13).
  2. Procédé selon la revendication 1, caractérisé en ce que le générateur créant un rayonnement thermique (4) émet un rayonnement infrarouge (4).
  3. Système automatique de placage des chants qui fonctionne en continu (1) pour la fusion thermique locale avec activation thermique de la surface adhésive des bandes de chant (9) pour la fabrication industrielle de meubles pour l'exécution du procédé selon la revendication 1 ou 2, caractérisé en ce que le système de placage des chants (1) présente un générateur créant un rayonnement thermique (4) installé essentiellement dans l'un des deux axes focaux (F1) d'un miroir semi-cylindrique elliptique (3), alors que l'autre axe focal (F2) se trouve dans une fente de passage (8) traversée par la bande de chant (9), qui est fournie au système de placage des chants (1) dans un assemblage continu de la bande (9) avec le bord (12) des panneaux (13) en bois ou en succédané du bois.
  4. Système selon la revendication 3, caractérisé en ce que ce dernier comporte :
    - un corps (2) avec une cavité qui constitue l'élément elliptique semi-cylindrique (3) avec une surface miroitante et est découpé en parallèle vers l'intérieur directement à côté d'un des deux axes focaux (F2) géométriques envers les génératrices de niveaux de la structure du corps (2), dans lequel cet axe se trouve en dehors du miroir elliptique (3),
    - des supports sous forme de segment (4) pour la génération du rayonnement thermique, qui sont installés à l'intérieur de l'élément elliptique miroitant (3) essentiellement dans le premier axe focal (F1) des deux axes géométriques de l'élément elliptique miroitant (3) et dont le segment actif s'étend sur une partie ou la totalité de la hauteur du miroir elliptique (3),
    - dans lequel la fente de passage (8) pour la bande de chant (9) dans laquelle le deuxième axe focal (F2) se trouve passe en dehors de l'élément elliptique miroitant (3) de manière orthogonale,
    - des roulettes (11) installées dans le sens du passage derrière le corps (2) du système de placage des chants (1), qui servent à guider automatiquement la bande de chant (9) de sorte à être pressé contre le bord (12) du panneau (13) de manière convergente.
  5. Système selon la revendication 4, caractérisé en ce que la fente de passage (8) pour la bande de chant (9) est définie par deux parois opposées coudées vers l'arrière (10).
  6. Système selon la revendication 4 ou 5, caractérisé en ce que ce dernier possède un convoyeur (14) qui sert à diriger les panneaux (13) les uns après les autres à travers le système (1).
  7. Système selon la revendication 4, 5 ou 6, caractérisé en ce que les supports de génération thermique (4) sont composés d'une bougie de réchauffage (4) pour l'émission d'un rayonnement infrarouge et dont le segment actif s'étend sur la totalité de la hauteur du miroir elliptique (3).
  8. Système selon l'une des revendications 4 à 7, caractérisé en ce que le corps (2) est composé d'un bloc métallique parallélépipède, sur lequel des ailettes (7) extérieures ou des moyens de couplage sont constitués pour la circulation d'un agent de refroidissement.
  9. Système selon l'une des revendications 4 à 7, caractérisé en ce que le corps (2) est composé d'un bloc métallique parallélépipède qui possède des conduites pour le débit d'un écoulement d'air, constituées de sorte à maintenir la cavité du miroir elliptique (3) à une pression positive.
EP15179806.3A 2014-08-21 2015-08-05 Procédé et dispositif pour thermo-fusion localisée Active EP2990171B1 (fr)

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ITPS20140012 2014-08-21

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EP2990171A1 EP2990171A1 (fr) 2016-03-02
EP2990171B1 true EP2990171B1 (fr) 2018-12-05

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT516455B1 (de) * 2014-11-10 2018-01-15 Scm Group Spa Kantenanleimvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120048473A1 (en) * 2010-08-24 2012-03-01 Homag Holzbearbeitungssysteme Ag Apparatus for Coating Workpieces

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
GB264814A (en) * 1926-01-23 1927-12-22 Emma Strada Improvements in, or relating to, soldering tins, and the like
FR2161073B1 (fr) * 1971-11-26 1977-04-22 Matsushita Electric Ind Co Ltd
US3864547A (en) * 1972-03-30 1975-02-04 Industrial Innovations Inc Safety portable radiant type electrical heater
DE2343499C3 (de) * 1973-08-29 1980-07-10 Schladitz-Whiskers Ag, Zug (Schweiz) Verfahren und Vorrichtung zum Metallisieren von bewegtem flächigem Gut
US4029935A (en) * 1975-05-20 1977-06-14 Blaine G. Greenwell Tools for applying heat in edge banding operations
AU1433801A (en) * 1999-10-27 2001-05-08 Fusion Uv Systems, Inc. Uv oven for curing magnet wire coatings
DE202007011911U1 (de) * 2007-08-24 2009-01-08 Rehau Ag + Co Kantenleiste für Möbelstücke
ES2480270T3 (es) * 2010-01-18 2014-07-25 Homag Holzbearbeitungssysteme Ag Dispositivo y procedimiento para el revestimiento de piezas de trabajo
DE102010008821A1 (de) * 2010-02-22 2011-08-25 Homag Holzbearbeitungssysteme AG, 72296 Verfahren zum Beschichten von Bauteilen
JP2012043548A (ja) * 2010-08-13 2012-03-01 Thermo Riko:Kk 高効率赤外線導入加熱装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120048473A1 (en) * 2010-08-24 2012-03-01 Homag Holzbearbeitungssysteme Ag Apparatus for Coating Workpieces

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