SE502004C2 - Method for producing kitchen hatch - uses wood fibre body with first high pressure laminate layer to front side of which frame is connected - Google Patents

Abstract

The method uses a wood fibre body (2) having a front and a rear side (4,6), and a first high pressure laminate layer (16) is incorporated which is applied over the complete rear side of the body and over a part of its front side. A frame (20) is arranged on and connected with the front side of the wood fibre body along parts of which on which the first high pressure laminate layer is not applied. The frame has a wood fibre core (19,23) on whose side directed outwards from the body the first high pressure laminate layer is applied. The first high pressure laminate layer is glued to the wood fibre body front and rear side. The first high pressure laminate layer is also glued to the frame. The frame is glued to the wood fibre body and all the parts forming the hatch are pressed against one another.

Description

502 10 15 20 25 30 35 004 2 that the door risks becoming skewed. The surface of a wooden door is also relatively scratch-sensitive.

Another type of kitchen door consists of a chipboard or a so-called MDF board, which has milled-out grooves for decoration purposes. The plate is then coated with a thin, resilient laminate foil of melamine or PVC. The foil is applied to the plate by means of negative pressure.

This door does not have the same tendency to warp as the wooden door described above, nor is it exposed to cracks. However, the laminate foil surface is not very durable, which is why it is quickly damaged.

It is especially common for the corners of the door to wear, with the result that the underlying plate is exposed and dirt and grease penetrate. It also happens that the laminate foil fractures and comes loose after a period of use. In addition, many of these laminate foils are environmentally unfriendly, due to the composition of the plastic.

Furthermore, a chipboard or MDF board with a laminate foil layer cannot measure up to a wooden door in terms of quality and finish, which of course also constitutes a disadvantage for such a door.

A construction that at first glance seems to eliminate the above-listed disadvantages is that a wood fiber frame is glued directly on top of a wood fiber board, where both the frame and the board have a hard layer, for example of high-pressure laminate, applied to their free surfaces.

Experience has shown that such a gap has not been possible to manufacture. It is generally difficult to glue a solid frame on top of a board frame to form a hatch as this tends to crack when the glue dries.

The skew problem becomes even more difficult when the frame is coated with a high-pressure laminate layer. Due to technical reasons, the high-pressure laminate layer cannot be placed on the surfaces that are to form adhesive joints, which means that the layer has a different distribution on the front and back of the plate, which further exacerbates the skew problem. 10 15 20 25 30 35 502 ÛÛ4 3 There is thus a need for a better solution in relation to the constructions described above.

An object of the invention is to provide a method for manufacturing a kitchen door, which is designed in such a way that the above-listed disadvantages are eliminated and which is rational in terms of manufacturing technology.

Another object of the invention is to provide a method for manufacturing a kitchen door which is considerably more durable than previously known kitchen doors and at the same time has an aesthetically pleasing shape and surface. The objects are achieved by means of a method according to the characterizing part of the following independent patent claims 1.

The invention makes it possible to manufacture a kitchen door which, thanks to its outer high-pressure laminate layer, is so durable that it is difficult to even by means of a nail able to scratch the surface. The surface is also very resistant to moisture, partly. For example, it is very easy to clean the surface with a grease and other dirt, which is important - because the kitchen is a workplace after all. wet sponge or cloth, without the risk of moisture penetrating the door. The durable and hard hard laminate layer is also a great advantage during transport. The doors do not need to be protected with expensive packaging, and it is even possible to mount the door handles in the factory before transport without the handles during packing risking scratching an adjacent door, which is not possible with previously known doors. By placing the frame on top of the frame, which is made possible by the invention, a very stable and robust construction is obtained, by means of which the risk of skew as a result of shocks is eliminated.

Preferred embodiments of the invention are set out in the dependent claims.

A preferred embodiment of the invention will be described in the following with reference to the accompanying drawing, in which the figure shows in perspective a part of a kitchen door with certain parts cut away for the sake of clarity.

The kitchen door according to the invention comprises a rectangular and flat sheet-shaped wood fiber frame 2 of MDF type, forming kitchen door - two long sides 8 and two cards - which have a front side 4, a back side 6, the front and back side, sides 12, respectively, one of the respective long and short sides is shown in the figure. The 2 long and short sides of the frame are slightly conical or bevelled.

A first high-pressure laminate layer 16 is applied over the entire back side 6 of the frame 2 and over a middle portion 18 of its front side 4.

On top of the front side 4 of the frame 2 along its longitudinal and 12, partly shown in the figure. short pages 8; is a frame 20 glued, which only The frame 20 is made up of two elongated, longitudinal, flat wood fiber cores 19 of MDF type (only one is shown in the figure), and two transverse, elongated, flat wood fiber cores 23 of MDF type (only the one is shown in the figure), which together form the frame 20. The frame 20 has a front side 22, a back side 24, long and short sides, as well as inner long and short sides and outer where the inner long and short sides are directed inwards towards the body. 2 in the middle, while the outer long and short sides are directed outwards from the frame 2.

The long and short sides of the frame are slightly conical or bevelled with the same chamfer as the long and short 12 of the frame.

The frame 20 is located on top of the front side 4 sides 8 of the frame 2; with their respective outer long and short sides edge to edge with 12, Inward direction towards the long and short sides 8 of the frame 2; so that the respective pages are located in line with each other. in the middle of the frame 2, the frame 20 overlaps the edge portions of the first high-pressure laminate layer 16 which is applied to the front of the frame 2, so that the inner long and short sides of the frame are a few mm inside the edge of the first high-pressure laminate layer 16. The wood fiber cores of the frame have a seam 26 for receiving the first high-pressure laminate layer 16. The first high-pressure laminate layer 16 is applice which is about 0.8 mm deep and about 5 mm wide. also applied to the front side 22 of the frame, while a second high-pressure laminate layer 17 is applied to its inner and outer short and long sides, and to the long and short sides 8 of the frame 2; 12. Since the outer long and short sides of the frame 20 and the long and short sides of the frame 2 are located in line with each other, their respective layers 17 are made in one piece, i.e. one outer long side of the frame 20 has a common and other high-pressure laminate layers 17 with the corresponding - curved long side etc.

The first high-pressure laminate layer 16 has a thickness of about 0.8 mm, while the second high-pressure laminate layer 17 has a thickness of about 0.4 mm.

The process for manufacturing a kitchen door according to the above is described in the following.

Initially, the first high-pressure laminate is glued so that the layer 16 is then glued to the high-pressure laminate layer 16 on the back side 6 of the frame 2, covering the entire back side 6. the wet layer 16 on the front side 4 of the frame 2 on the middle portion 18, so that a frame-shaped outer portion the high pressure laminate layer 16.

An elongate wood fiber core blank (not shown) intended to form a frame by gluing with the first is laid on its upper or lower side, while the front side 22 of the pressure laminate layer 16, after which also one long side of the wood fiber core blank is glued to the second the high-pressure laminate layer 17, which long side is intended to form the inner long and short sides of the frame 20.

The elongate wood fiber core blank is then folded on the side not coated with the first high pressure laminate layer 16 to form the seam 26.

Thereafter, the wood fiber core blank is cut by means of a cemented carbide saw to desired lengths to form the wood fiber cores 19, 23. 502 l0 15 20 25 30 35 004 6 The wood fiber cores 19, 23 are then glued to the body 2, with the side lacking high pressure laminate layers facing downward to form of the frame 20, the adhesive joint being formed between the fibrous material in the frame 20 and the fibrous material in the frame 2.

After each gluing operation, the glued details are placed in a special gluing press.

When the doors are glued and compressed, they are placed in a special ventilation rack (not shown) which rack holds the door, backs are fully exposed to the air. for drying, so that its front and hatches are aerated in this aeration rack for at least 8 hours, and preferably about 12 hours.

After aeration of the kitchen doors, the 12 and the outer long and short sides of the frame 20 are completed to the right by milling the long and short sides 8 of the frame 2; phasing, after which the second high-pressure laminate layer 17 is applied by gluing.

The entire manufacturing process, ie including the aeration time, is carried out in a climate where the relative humidity is between 50 and 60%. If you try to carry out production under other relative humidity, the finished door will close, as shown in an example below. The parts included in the door must before storage be stored in a room with the same, ie 50-60%.

In manufacturing, it is preferable that only a relative humidity as above, limited amount of glue is used. is l0O-l10g / m2 of an adhesive with the trademark CASCOL 3316. which is reproduced below has shown that if you do not try the preferred amount of adhesive, the doors are vented almost immediately after pressing, this leads to the doors closing. In the experiment shown in Table 1, the doors have been left in the press to mimic a situation where air cannot access the doors, such as when stacking doors on top of each other, or placing 10 10 20 20 502 004 7 In the two cases where the doors have been removed from the press after 0.5 and 1.0 hours, respectively, have doors next to and next to each other. the door was then placed in the air vent for at least 8 hours, with the result that no skew occurred. In other cases, the skew has already been a fact when removed from the press, and a subsequent aeration has not helped.

Table 2 shows how the relative humidity affects the skew of the finished door, even if it is ventilated for at least 8 hours.

Table 1 (experiments in 60% humidity) Time in the press (h) Concave (mm / m) 0.5 - 1.0 - 3.0 1 8.0 3 14.0 3 Table 2 Humidity (%) Concave (mm / m) Convex (mm / m) 70 - 3 so - - so - - 45 1 40 2 - 35 5 Measures of the inventive method to aerate the doors for a period of at least 8 hours together with the production being carried out in a relative air humidity of 50-60%, thus eliminates the problems that experience has shown when trying to glue a solid frame on a solid frame, and especially when the high-pressure laminate on the frame has different extensions on the front and back of the frame. This in turn enables the creation of a kitchen door with the advantages described above over previously known cabinet doors.

It will be appreciated that the invention may be modified within the scope of the scope defined in the claims. For example, it is possible to glue the first high-pressure laminate layer on a larger MDF board over its entire front and back, and then partly cut the board to the correct door dimensions, and partly mill away the required portions of the first high-pressure laminate layer to receive the frame.

Claims (9)

l0 15 20 25 30 35 502 004 PATENT REQUIREMENTS A method of manufacturing a cabinet or kitchen door, which comprises a wood fiber frame (2) with a front and back side (4, 6), and a first high-pressure laminate layer (16), which is applied over the entire back side (2) of the frame (2). 6) and over a part of its front (4); and a frame (20), which is arranged on and connected to the front side (4) of the wood fiber frame (2) along portions thereof thereon on which the first high-pressure laminate layer (19:23), on whose side of the frame directed outwardly from the frame ( 16) is not applied, and which has a wood fiber core but the first high-pressure laminate layer is applied, which method comprises the steps of gluing the first high-pressure laminate layer (16) to the front and back of the wood fiber frame (2), respectively; gluing the first high pressure laminate layer (16) to the frame (20): gluing the frame (20) to the wood fiber frame (2); and that the parts included in the kitchen door are pressed against each other, characterized in that the parts included in the door are stored before gluing and pressing under a relative humidity of 45-65%; that the gluing and pressing is carried out under a relative humidity of 45-65%; that the door, after pressing and during essentially and the entire drying period of the adhesive, is placed for at least 8 hours in such a way that its front and back are freely exposed to air with a relative humidity of 45-65%. Method according to claim 1, characterized in that the parts are stored, a relative humidity of 50-60%; glued and pressed underneath and that the door is placed 502 10 15 20 25 004 10 exposed to air with a relative humidity of 50-60%. 3. A method according to claim 1 or 2, characterized in that the door is placed for exposure to air within 1 hour from the final pressing. Method according to one of Claims 1 to 3, characterized in that the door is placed exposed to air for at least 10 hours. A method according to any one of claims 1-4, characterized in that the door is placed exposed to air for about 12 hours. Method according to one of Claims 1 to 5, characterized in that a second high-pressure laminate layer (17) is glued to the long and short sides (8, 10; 12, 14) of the frame (2), and to the frame (20). inner and outer long and short sides. Method according to one of Claims 1 to 6, characterized in that the frame (2) (20) A method according to any one of claims 1 to 7, wherein the outer periphery substantially coincides with the outer periphery of the frame. k ä n - n e t e c k n a t av att stommens (2) 10; 12, 14) (20) short sides are arranged in line with each other. long and short sides (8, and the outer long and short sides of the frame) A method according to any one of claims 1-8, characterized in that the layer (16) is identical. in that the first high-pressure laminate and the second high-pressure laminate layer (17)