WO2002072336A1

WO2002072336A1 - Improved piece for laminating panels

Info

Publication number: WO2002072336A1
Application number: PCT/ES2002/000101
Authority: WO
Inventors: José Miguel MENÉNDEZ OCHOA
Original assignee: Naisa, Naves En Alquiler Para La Industria S.L.
Priority date: 2001-03-09
Filing date: 2002-03-07
Publication date: 2002-09-19
Also published as: ES1048527U; ES1048527Y

Abstract

The invention relates to a piece for layered lamination. The concealed face of said invention, which is intended to be applied without solution of continuity to the pressed wood panel and one or both edges of said panel, is provided with a longitudinal milled band in a marginal area thereof. The nominal thickness of the laminate is reduced in said band, while it remains the same in the rest of the piece. The milled band extends in such a way as to coincide with a transition zone of the pressed panel which is defined by the ridges formed between the flat surfaces of the panel and the surface of the edges thereof and which must be applied to said marginal zone.

Description

PERFECTED PIECE FOR BOARD ROLLING

D E S C R I P C I Ó N

The present invention relates to a perfected piece for the laminate of boards, specifically a laminated piece which, being of the type constituted, preferably, by two or more sheets of paper impregnated in resins, of which the outermost sheet of paper It is of a decorative type, it is intended to be plated without continuity solution on at least one side of a wood chipboard.

In the known technique, the wood chipboard boards or the like that must be covered with laminated pieces in the form of sheets of the laminated material mentioned above, are cut to the specific measures requested by the customer, while in a parallel operation it proceeds to the cut of the covering sheet to the size of the board, which can be carried out conventionally so that the laminate piece has a marginal area that exceeds the width of the board in a portion suitable for covering the edge of the board, which will have been profiling by milling in shape, preferably, that includes one or more blunt edges or convex curved shape, without excluding other configurations, after which the piece of laminate on the corresponding face of the board is clamped, by gluing, heat and pressure, subtracting the marginal area thereof in cantilever and without placating, which is carried out in a subsequent postforming operation, in which , also by gluing, heat and pressure, said marginal area is placated on the surface of the profiled edge of the board.

In other cases, as recommended in the patent ES 8900541, it starts from a straight edge board and covered with pieces of laminate on one or both sides (sandwich) in which, by means of a straight milling, a marginal area of the coated board comprising a marginal area of the laminate piece not seen in the assembly, in the case of sandwich laminated boards, and a marginal area of the board, respecting a marginal area of the laminate piece corresponding to the exposed face of the assembly, with which, on the board, a straight edge displaced towards the interior of the assembly is configured and, on the laminate piece, a marginal cantilevered area, after which a new straight edge is adhered to section profile of circular or other quadrant, on which the aforementioned marginal area of the laminate piece is pressed by gluing, pressure and heat.

In all cases, the problem arises that for quality products, the laminate piece must have a sufficient thickness so that in the cladding they do not transcend the small granular irregularities due to the specific deformation of the laminate piece itself. of the board, but against them these pieces of laminate are extremely difficult to postform in the act of placating the curved edges of the board, which, in practice, precludes the post-forming of edges in the pieces of high quality laminate. To avoid such an inconvenience, it was agreed to make a plurality of narrow parallel grooves, in a marginal area of the unseen face of the laminated pieces, coinciding with the transition zone of the wood chipboard on which the piece is curved of laminate, specifically the edges and edges more or less rounded, as contemplated in patents JP 60024902 and JP 2001001313 and utility model ES 200100551.

Similarly, as set forth in JP 612861102, the narrow grooves are made in a thin wooden plate that, attached to the laminate in the marginal zone of curvature, defines supporting partitions of the laminate on the curved surface of the edges and edges of the wood chipboard.

In these preceding cases, although greater flexibility is achieved for the laminate without sensitive impairment of the thickness of the laminate, the drawback is that cracks are formed between the narrow grooves and the partitions formed by them in the unseen face of the piece of laminate.

In order to solve such difficulty, the solution has been adopted to give the board laminate piece greater flexibility in the zones of the same that undergo a more pronounced flexion, especially in the areas in which the piece is curved to pass from a flat surface to a curved surface or to another flat surface through a blunt edge of more or less pronounced radius. In accordance with the above solution, the laminate piece for boards object of the invention has been developed, according to which the piece for laminate, on its face not seen of cladding without continuity solution to the wood chipboard and one or both edges thereof, it has, longitudinally in a marginal area, a milled strip in which the nominal thickness of the laminate is reduced, while maintaining it in the rest of the piece, and said milled strip is extended in coincidence with a transition zone of the agglomerate board which, defined by the edges formed between the flat faces of the same and the surface of its edges, must be flattened with said marginal zone. A feature of the invention is that the milled strip of the marginal zone has the reduction of the nominal thickness of the laminate over the entire length of its width, either symmetrically gradually or substantially constant throughout the practical extension of its width. Characteristic of the invention is the fact that the width of the milled strip of the marginal zone is proportional to the amplitude of the transition zone between the flat face of the board and the flat surface of the corresponding edge thereof, or the entire surface of the I sing in the case that this is curvilinear profile. Consequently, in general, the laminate piece maintains the nominal thickness in the flat parts and reduced in the milled laminated strip of the marginal zone.

Obviously the number of milled stripes in the marginal zone is a function of the number of transition zones to be covered in each edge of the board.

To facilitate the understanding of the foregoing ideas, the object of the invention is described below, with reference to the accompanying illustrative drawings. In the drawings: Figure 1 represents, schematically in straight section, a side portion of a wooden chipboard board that has a straight edge of blunt edge is clamped on both sides by means of laminated pieces of which one extends into a marginal area intended for its placated or postformed on said song, all according to the conventional procedure.

Figure 2 represents, on an enlarged scale, the postforming arrangement of the marginal area of the laminate part of Figure 1.

Figure 3, similarly to the previous figure, represents a marginal area of a piece of laminate in which a conventional embodiment of the milled strip is shown, according to which the nominal thickness of the piece is reduced intermittently, throughout the width of the milled strip and in the form of slots of rectangular section.

Figure 4 represents, analogously to figure 2, the postforming arrangement of the marginal area of the laminate piece of figure 3, in relation to its milled strip, on a blunt edge of a board edge.

Figure 5, represents transversely, on a very enlarged scale, a marginal area of a piece of laminate in which an embodiment of a milled strip, characteristic of the invention, according to which the nominal thickness of the piece of laminate is reduced in Continuous form.

Figure 6 represents, on an enlarged scale, the postforming arrangement of the marginal area of the laminate piece of Figure 5, in relation to its milled strip, on a blunt edge of a board edge.

Figure 7 represents, analogously to Figure 5, a marginal area of a piece of laminate in which an embodiment of the milled strip characteristic of the invention can be seen, according to which the reduction of the nominal thickness of the piece is kept substantially constant of laminate

Figure 8 depicts, analogously to Figure 6, the postforming arrangement of the marginal area of the laminate part of Figure 7, in relation to its milled strip, on a blunt edge of a board edge.

Figure 9, represents a case of postforming forming a board that has a chamfered edge with two blunt edges. Figure 10 represents the case of cladding and postforming a board intended to constitute a countertop.

Conventionally, as shown in Figure 1, laminated boards intended for the construction of furniture and countertops, especially used in kitchens and bathrooms, without excluding covering panels or compartmentalisation of spaces, troughs and others, are essentially constituted by a board 1 of wood agglomerate that has one or two longitudinal edges 2, which are configured flat with blunt edges, rounded or other shaped, and one or both of its major faces covered by a cladding of a postformable piece of laminate 3 which is constituted, at least, by two layers of paper impregnated in resins, of which the exterior is constituted by a design paper, with decorative printing and impregnated in a thermosetting resin of melamine-formaldehyde, while the interior is constituted by a barrier paper, without design features and impregnated with a mixture of melamine thermosetting resins -formaldehyde and phenol-formaldehyde.

As can be seen in the indicated figure 1, the laminate piece 3, located superiorly in the drawings, has a marginal cantilevered area 3A that is not adhered or flattened to the board 1 and that has a width that allows its postforming by adhesive, heat and pressure over the entire width of the edge 2.

The nominal thickness E of the laminate pieces must be sufficient so that the possible small point irregularities do not transcend through them, which can incorporate the surface of the larger faces and the edges 2 of the boards 1 , such as granules of the material itself or foreign materials, slight concave or convex surface irregularities, etc. This drawback occurs when said nominal thickness E and the Compactness of the laminate pieces 3, are of reduced value, thereby deforming superficially by copying said irregularities. Otherwise, when the nominal thickness E and the compactness of the laminate pieces 3 are adequate, such irregularities are absorbed by the thickness of the laminate pieces 3 and do not transcend the visible face thereof.

This need to use relatively large nominal thicknesses E in the manufacture of quality articles, presents the counterpart that hinders the postforming operation of the edges 2 of the boards 1, since the folding of the laminate piece 3 by a longitudinal portion of the marginal zone 3A thereof according to a reduced radius angle creates high compression stresses, in the internal part of the arc of curvature, and tensile, in the external part of said arc of curvature, which tend to return said zone marginal 3A to the initial position overcoming, at some point, the bond strength of the sizing and the thermoplastic conformation made therein during postforming.

In order to be able to use laminated parts 3 of suitable nominal thickness E in articles with quality in their construction, their duration, their resistance to hostile environments and their finishing, the solution of conferring greater was adopted as previously stated flexibility to the laminate part 3 in the areas thereof that suffer a more pronounced bending, especially in the parts where the laminate part 3 bends to pass from a flat surface to a curved surface or to another flat surface, by means of a degree of bending over the blunt edges of more or less pronounced radius.

According to an embodiment known in the Japanese patents cited in the state of the art, the laminate part 3, as shown in figure 3, has a milled strip 4A in its marginal zone 3, so that it has a reduced value e of the nominal thickness E in parts 6 of the extension of its width A, while in parts 7 alternated with the previous ones the nominal thickness is maintained. As can be seen in Figure 3, the parts of reduced thickness e consist of narrow parallel grooves whose depth is less than the nominal thickness of the marginal zone 3A, said parts being configured in the form of narrow grooves, such as those indicated with reference 6 in figure 3, which have parallel walls and define rectangular straight sections, or are formed by inclined walls converging towards the face 3a of the laminate 3, which have not been represented.

Similarly to the case of Figure 2, Figure 4 corresponds to the postforming of the marginal zone 3A provided with the milled strip 4A, resulting in a product prone to cracking on the outer face of the milled strip 4A.

In accordance with the solution adopted at the beginning, the laminate part 3 object of the invention has been developed, according to which said laminate piece, in its face not seen of cladding without continuity solution on a corresponding face of a board 1 of agglomerated wood and one or both edges 2 thereof, it has, longitudinally in the marginal area 3A, as shown in Figure 5, a milled strip 4B in which the nominal thickness E is reduced to a dimension e, at the same time that said nominal thickness E is maintained for the rest of the laminate part 3, and extends in coincidence with the transition zone 5 of the wood agglomerate board 1 which, defined by the blunt edges of smaller or greater amplitude formed between the flat faces of the board 1 and the surface of the edges 2 thereof. As shown in said figure 5, the milled strip 4B of the marginal zone 3A of the rolling piece 3 has the thickness e, reduced of the nominal thickness E, over the entire length of its width A, so that, as can be seen in figure 6, after the postforming operation, the milled strip 4B curves over the blunt edge 5 of the edge 2, creating minimum compression and tensile stresses that allow the use of any high value for the nominal thickness dimension E, at time a configuration with a vault effect is created. Figure 7 shows a milled strip 4C, similar to the milled strip 4B of the marginal area 3A of the rolling piece 3, in which the reduced thickness g is of practically constant value throughout the entire length of its width A, depicting in figure 8 the flattening of the marginal zone on the edge 2 of a board 1.

In all cases, the width A of the milled strips 4B and 4C of the marginal zone 3A is proportional to the amplitude of the transition zone 5 between the flat face of the board 1 and the flat surface of the edge

2 corresponding to it, or the entire surface of the edge 2 in the case where it has a curvilinear profile.

Figures 8 and 9 show the cases in which the marginal area 3A of the laminate piece 3 comprises two milled strips 4B intended for a chamfered edge, in the first, and a countertop edge, in the second.

Claims

1.- Improved piece for the laminate of boards, specifically a piece of laminated laminate of those destined to be plated without continuity solution on at least the whole of a flat face of a wood chipboard board and one or two of the longitudinal edges of the same, so that a marginal area of the piece undergoes a post-forming to adapt by bending to the edges by a local treatment of heat, pressure and an application of an adhesive on the or the edges of the wood chipboard board, characterized in that the piece for rolling, on its face not seen of cladding without continuity solution to the wood chipboard and one or both of its edges, has, longitudinally in a marginal area, a milled strip in which reduces the nominal thickness of the laminate, while maintaining the same in the rest of the piece, extending that milled strip in coincidence with a transition zone ón of the agglomerate board that, defined by the edges formed between the flat faces of the same and the surface of its edges, must be placated with said marginal zone.

2. - A piece perfected for the laminate of boards, according to the previous claim, characterized in that the milled strip of the marginal zone presents the reduction of the nominal thickness of the laminate in the entire length of its width.

3. Improved piece for the laminate of boards, according to claim 1, characterized in that the milled strip of the marginal zone presents the reduction of the nominal thickness in a symmetrically gradual way that covers the entire extension of its width.

4.- Improved piece for the laminate of boards, according to claim 1, characterized in that the milled strip of the marginal zone it presents the reduction of the nominal thickness in a substantially constant way throughout its entire width.

5. Improved piece for the laminate of boards, according to claim 1, characterized in that the width of the milled strip of the marginal zone is proportional to the amplitude of the transition zone between the flat face of the board and the flat surface of the edge corresponding to it.