(19)
(11)EP 3 031 535 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.01.2018 Bulletin 2018/03

(21)Application number: 14835004.4

(22)Date of filing:  04.08.2014
(51)Int. Cl.: 
B05C 5/04  (2006.01)
F16J 13/16  (2006.01)
B05C 11/10  (2006.01)
B05C 5/00  (2006.01)
(86)International application number:
PCT/ES2014/000132
(87)International publication number:
WO 2015/018953 (12.02.2015 Gazette  2015/06)

(54)

MELTER

SCHMELZOFEN

DISPOSITIF DE FUSION


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 07.08.2013 ES 201331242

(43)Date of publication of application:
15.06.2016 Bulletin 2016/24

(73)Proprietor: Meler Aplicadores De Hot-Melt, S.A.
31160 Orcoyen (Navarra) (ES)

(72)Inventors:
  • ZABALZA GOÑI, José
    E-31160 Orcoyen (Navarra) (ES)
  • TELLECHEA BIDEGAIN, Carlos
    E-31160 Orcoyen (Navarra) (ES)

(74)Representative: Intès, Didier Gérard André et al
Cabinet Beau de Loménie 158 rue de l'Université
75340 Paris Cedex 07
75340 Paris Cedex 07 (FR)


(56)References cited: : 
EP-A1- 0 107 077
ES-A1- 2 356 758
US-A- 4 485 941
US-A- 5 919 384
EP-A2- 0 005 707
FR-A1- 2 749 746
US-A- 5 735 588
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Technical Field



    [0001] The present invention relates to the application of hot-melt materials, and more specifically to the melting of said materials for the application thereof, proposing a melter for that purpose with features that improve the insulation of the functional parts for preserving them, nevertheless allowing easy access to inner parts for maintenance.

    State of the Art



    [0002] Certain materials, such as hot-melt adhesives or glues, are solid at room temperature and when a higher temperature is applied to them they become pasty, until acquiring a fluidity that allows the application thereof by deposition using guns or similar means, said materials again reaching the solid state when they cool, without losing their structural features.

    [0003] These materials, referred to as hot-melt materials, are used in many applications as attaching or covering means, such that they are supplied in solid state, being melted by means of heat when they are going to be applied, for which purpose a melter is used which consists of a melting chamber and a system for driving the fluid material, once it is melted, for the application thereof.

    [0004] Melters (see for instance US 5,919,384 or EP0718234) existing for the application of hot-melt materials have the drawback, however, that when the melting chamber overflows or when molten material slides out when the lid of said melting chamber is opened, the overflowing or dripping molten material enters the area where the functional elements of the melter are located, which can cause operating malfunctions and shorten the service life of the melter.

    Object of the Invention



    [0005] According to the invention, a melter is proposed for the application of hot-melt materials, made with structural features preventing the entry of molten material into the parts where the functional elements are located, effectively correcting the drawback of conventional hot-melt material melters and applicators in this regard.

    [0006] This melter object of the invention comprises a block housing the control elements of an electrical system and of a pneumatic system, and a block housing a melting chamber of the hot-melt materials and the outlet system for the molten hot-melt material for the application thereof.

    [0007] In the corresponding block, the melting chamber for melting the hot-melt materials is arranged in a floating assembly, with the freedom to expand upwards, said melting chamber having an opening in the upper part, on the edge of which there is arranged a gasket having an upwardly inclined flexible lip in the outer part, there being on said gasket a perimetral frame having an upward vertical flange, that frame having an upper notch in the vertical flange of an edge, whereas posts emerge upwards from the frame in the opposite part, said posts having a notch in the upper part; whereas covering the arrangement of the melting chamber there is provided a shell supporting said melting chamber on the inclined flexible lip of the gasket of the opening, that shell having in the upper part an openable lid assembled such that it swings, which lid in the closed position is supported on the gasket of the edge of the opening of the melting chamber.

    [0008] A melter is thereby obtained in which between the melting chamber and the cover shell there is a complete leak-tightness preventing that any overflow or drip of the molten material may fall into the functional elements located outside the chamber, due to the support of the cover shell on the inclined flexible lip of the gasket of the opening of the melting chamber, and because the expansions of said melting chamber increase the tightness of the sealed closure between the shell and the melting chamber, preventing the passage of molten fluid material between them. The upper notch of the vertical flange of an edge of the frame of the opening of the melting chamber also acts as an overflow so that if said melting chamber is overfilled, the surplus molten material comes out through said notch.

    [0009] In relation to the area of the swing rotation of the lid of the cover shell covering the melting chamber, the shell defines a vertically arcuate edge, with respect to which the edge of the lid acts as a scraper when said lid swings towards the open position, carrying away the molten fluid material that may have been deposited on that edge, to make that material fall into the melting chamber.

    [0010] The lid of the shell furthermore has on its lower face a structure in the form of an inverted pan which, when the lid swings towards the open position, makes the molten fluid material that may have been deposited on that lower face of the shell fall directly into the melting chamber. Said structure in the form of an inverted pan furthermore establishes, with its edge, support on the gasket of the edge of the opening of the melting chamber, establishing an effective closure seal of the lid in the closed position, with respect to the melting chamber, to prevent the passage of molten fluid material through said closure.

    [0011] The swinging assembly of the lid of the shell is established by support, by means of pivots of the lid, on upper notches of the posts of the frame of the opening of the melting chamber, such position being reached by the supporting pivots entering through front grooves of the shell in said assembly area of the lid, whereby resulting in a secure assembly of the lid with freedom to swing for opening and closing; nevertheless, the lid can be readily detached for cleaning or maintenance operations by means of a lifting motion and a forward extraction movement.

    [0012] As a result, the proposed melter offers features making it advantageous and preferred with respect to melters known today for use in melting and applying hot-melt materials.

    Description of the Drawings



    [0013] 

    Figure 1 shows a perspective view of a melter for hot-melt materials according to the invention, with the cover shell of the melting chamber being raised with respect to the assembly position and the upper lid of said shell being extracted towards the front.

    Figure 2 is a cross-section view of the block containing the melting chamber in the melter in the preceding figure, with the cover shell placed in its assembly position.

    Figure 3 is an enlarged partial detail of an area of the preceding figure in which the support of the shell and of the lid on the gasket of the opening of the melting chamber is seen.

    Figure 4 is a partial perspective view in which the opening of the melting chamber of the melter with the lid in the open position is seen.

    Figure 5 is an enlarged detail of one of the areas of the assembly coupling of the lid of the melting chamber in the melter of the invention.

    Figure 6 is a perspective view of a detail of the relation of the scraping function of the lid of the melting chamber with respect to the edge of the cover shell in the melter of the invention.

    Figures 7 and 8 are respective sectional side views showing the swiveling of the lid of the melting chamber, in an intermediate swivel position and in the open complete swivel position, respectively.


    Detailed Description of the Invention



    [0014] The object of the invention relates to a melter intended for applying hot-melt materials, comprising a block (1) housing the control elements of an electrical system and of a pneumatic system, and a block (2) in which there is housed a melting chamber (3) for melting the hot-melt materials in order to turn them into fluid material, and the elements of an outlet system (4) for the molten fluid material for the application thereof, said blocks (1 and 2) incorporating respective cover shells (5 and 6) which can be removed independently for required internal repair or maintenance operations.

    [0015] The melting chamber (3) for melting the hot-melt materials is arranged in the corresponding block (2) in a floating assembly by means of being held on lower supports (7), with the freedom to expand upwards due to the effect of the temperatures required for melting the hot-melt materials, said chamber (3) having an opening in the upper part, on the edge of which there is arranged a gasket (8) and on it an L-shaped frame (9) having an upward vertical flange.

    [0016] The gasket (8) has an upwardly inclined flexible lip (10) in the outer part, on which the shell (6) of the block (2) rests when assembled, establishing a leak-tight closure with respect to the chamber (3), such that when said chamber (3) expands upwards due to the temperature, the flexible lip (10) allows such expansion without creating stresses that may deform the shell (6) and without losing the leak-tightness of the closure with respect to the chamber (3), since it increases the pressure of the support between the shell (6) and the flexible lip (10), enhancing the leak-tightness. Said closure between the shell (6) and the flexible lip (10) of the gasket (8) additionally acts as a heat barrier to prevent heat from sliding out of the chamber (3), which allows making maximum use therein of the heat used to melt the hot-melt materials.

    [0017] The shell (6) has a lid (11) in the upper part which incorporates a structure (12) in the lower face in the form of an inverted pan, whereby in the closed position it is supported on the gasket (8), establishing a leak-tight closure around the opening of the chamber (3). Therefore, a closure is established on the chamber (3) by means of the lid (11) which allows optimally making use of the heat inside said chamber (3) to melt the hot-melt materials, while at the same time preventing the material being melted from being able to splatter outside the melting compartment.

    [0018] The structure (12) in the form of an inverted pan furthermore collects the molten material that may splatter onto the lower face of the lid (11), such that the splattered molten material falls from said structure (12) directly into the chamber (3), without dripping out of same.

    [0019] The lid (11) is arranged in a supporting assembly by means of pivots (13) on the sides of its rear end, on posts (14) emerging upwards from the frame (9), which posts (14) have notches on the upper part where the pivots (13) engage, such that the lid (11) can swing between an open position and a closed position, rotating with respect to such supports of the pivots (13) on the posts (14).

    [0020] In that arrangement, when the lid (11) swings towards the open position, the structure (12) making the molten material that may be deposited thereon due to the splattering occurring during melting drip from said structure (12) to also fall directly into the chamber (3).

    [0021] Furthermore, in the assembly area of the lid (11), the shell (6) defines a vertically arcuate edge (15), with which the corresponding edge of the lid (11) is related, such that said corresponding edge of the lid (11) acts as a scraper on said arcuate edge (15) of the shell (6) when the lid (11) swings. Therefore, when the lid (11) swings to the open position, it carries away the molten material that may have been deposited on the mentioned arcuate edge (15) of the shell (6) into the chamber (3).

    [0022] In turn, the frame (9) of the opening of the chamber (3) has a cutout (16) in an area of its vertical flange acting as an overflow so that if there is over filling of the chamber (3), the material that is melted therein will exit the melter without overflowing over the rest of the contour of the opening of the chamber (3).

    [0023] In the assembly area for the lid (11), the shell (6) has grooves (17) frontally facing the posts (14), such that the pivots (13) can enter and exit through said grooves (17) for the assembly and detachment of the lid (11), which can be extracted from its assembly quite easily by simply lifting it up slightly until the pivots (13) come out of the upper notches of the posts (14) and then moving it forward, the pivots (13) going through the grooves (15); whereas the assembly is performed in an equally easy manner, but inversely, i.e., introducing the pivots (13) into the grooves (15) until said pivots (13) engage in the upper notches of the posts (14).


    Claims

    1. A melter comprising a melting chamber (3), provided with an upper opening, which is covered, together with the elements of a outlet system (4) for the molten material for the application thereof, by a shell (6) incorporating a lid (11) for closing the opening of the chamber (3), characterized in that the chamber (3) is arranged in an assembly in which it is held on lower supports (7) with the freedom to expand upwards, said chamber (3) incorporating on the edge of the upper opening a gasket (8), on which the lid (11) is supported in the closed position, said gasket (8) having an upwardly inclined flexible lip (10) in the outer part on which the shell (6) rests, establishing a leak-tight closure with respect to the chamber (3), whereas on the gasket (8) there is arranged an L-shaped frame (9) having an upward vertical flange, with respect to which the lid (11) is assembled with the possibility to swing between a closed position and an open position.
     
    2. The melter according to claim 1, characterized in that the lid (11) is detachable, being assembled by means of pivots (13), which said lid has on the sides of its rear end, resting on notches of the upper part of posts (14) upwardly emerging from the frame (9), the shell (6) having grooves (17) opposite said posts through which the pivots (13) can pass.
     
    3. The melter according to claim 1, characterized in that the lid (11) incorporates a structure (12) on its lower face in the form of an inverted pan, which rests on the gasket (8) in the closed position of the lid (11), establishing a leak-tight closure around the opening of the chamber (3).
     
    4. The melter according to claim 1, characterized in that in relation to the assembly area of the detachable lid (11), the shell (6) defines an vertically arcuate edge (15), on which the corresponding edge of the lid (11) acts as a scraper when said lid (11) swings.
     
    5. The melter according to claim 1, characterized in that the frame (9) has a cutout (16) in an area of its vertical flange acting as an overflow for the chamber (3).
     


    Ansprüche

    1. Schmelzvorrichtung, umfassend eine Schmelzkammer (3), die mit einer oberen Öffnung versehen ist, welche zusammen mit den Bauteilen eines Ablaufsystems (4) für das geschmolzene Material zur Anwendung desselben von einer Umhüllung (6) mit einem Deckel (11) zum Schließen der Öffnung der Kammer (3) abgedeckt ist,
    dadurch gekennzeichnet,
    dass die Kammer (3) in einer Baugruppe angeordnet ist, in welcher sie mit der Freiheit, sich nach oben auszudehnen, auf unteren Stützen (7) gehalten wird, wobei die Kammer (3) am Rand der oberen Öffnung eine Dichtung (8) aufweist, auf welcher der Deckel (11) in der geschlossenen Position aufliegt, wobei die Dichtung (8) im äußeren Teil, an dem die Umhüllung (6) aufliegt, eine nach oben geneigte elastische Lippe (10) aufweist, was eine leckdichte Abschließung bezüglich der Kammer (3) bildet, während an der Dichtung (8) ein L-förmiger Rahmen (9) angeordnet ist, der einen senkrecht nach oben stehenden Flansch aufweist, in Bezug auf welchen der Deckel (11) mit der Möglichkeit montiert ist, zwischen einer geschlossenen Position und einer offenen Position zu schwenken.
     
    2. Schmelzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Deckel (11) abnehmbar ist und mittels Drehzapfen (13), welche der Deckel an den Seiten seines hinteren Endes aufweist und die auf Einkerbungen des oberen Abschnitts von Stempeln (14), die sich vom Rahmen (9) nach oben erstrecken, ruhen, montiert ist, wobei die Umhüllung (6) Nuten (17) gegenüber den Stempeln aufweist, durch welche die Drehzapfen (13) hindurchtreten können.
     
    3. Schmelzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Deckel (11) eine Struktur (12) an seiner Unterseite in Form einer umgedrehten Schale aufweist, welche in der geschlossenen Position des Deckels (11) auf der Dichtung (8) aufliegt, was eine leckdichte Abschließung rund um die Öffnung der Kammer (3) bildet.
     
    4. Schmelzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Umhüllung (6) in Bezug auf den Montagebereich des abnehmbaren Deckels (11) einen in vertikaler Richtung gebogenen Rand (15) definiert, an welchem die entsprechende Kante des Deckels (11) als ein Abstreicher arbeitet, wenn der Deckel (11) geschwenkt wird.
     
    5. Schmelzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Rahmen (9) in einem Bereich seines senkrechten Flansches einen Ausschnitt (16) aufweist, der als ein Überlauf für die Kammer (3) dient.
     


    Revendications

    1. Dispositif de fusion comprenant une chambre de fusion (3), prévue avec une ouverture supérieure, qui est recouverte, conjointement avec les éléments d'un système de sortie (4) pour le matériau en fusion pour son application, par une coque (6) comprenant un couvercle (11) pour fermer l'ouverture de la chambre (3), caractérisé en ce que la chambre (3) est agencée dans un assemblage dans lequel elle est maintenue sur des supports inférieurs (7) avec la liberté de subir une expansion vers le haut, ladite chambre (3) comprenant, sur le bord de l'ouverture supérieure, un joint (8), sur lequel le couvercle (11) est supporté dans la position fermée, ledit joint (8) ayant une lèvre flexible (10) inclinée vers le haut dans la partie externe sur laquelle la coque (6) s'appuie, établissant une fermeture étanche aux fuites par rapport à la chambre (3), tandis que sur le joint (8), on agence un bâti en forme de L (9) ayant une bride verticale vers le haut, par rapport à laquelle le couvercle (11) est assemblé avec la possibilité d'osciller entre une position fermée et une position ouverte.
     
    2. Dispositif de fusion selon la revendication 1, caractérisé en ce que le couvercle (11) est détachable, étant assemblé au moyen de pivots (13), que ledit couvercle a sur les côtés de son extrémité arrière, s'appuyant sur des encoches de la partie supérieure des montants (14) sortant, vers le haut, du bâti (9), la coque (6) ayant des rainures (17) opposées auxdits montants à travers lesquels les pivots (13) peuvent passer.
     
    3. Dispositif de fusion selon la revendication 1, caractérisé en ce que le couvercle (11) comprend une structure (12) sur sa face inférieure se présentant sous la forme d'une cuvette inversée, qui s'appuie sur le joint (8) dans la position fermée du couvercle (11), établissant une fermeture étanche aux fuites autour de l'ouverture de la chambre (3).
     
    4. Dispositif de fusion selon la revendication 1, caractérisé en ce que par rapport à la zone d'assemblage du couvercle détachable (11), la coque (6) définit un bord verticalement arqué (15), sur lequel le bord correspondant du couvercle (11) sert de racloir lorsque ledit couvercle (11) oscille.
     
    5. Dispositif de fusion selon la revendication 1, caractérisé en ce que le bâti (9) a une découpe (16) dans une zone de sa bride verticale servant de trop-plein pour la chambre (3).
     




    Drawing


















    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description