JP3145882B2 - Bonding method of veneer to substrate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bonding a veneer to a substrate having an inclined surface around a surface and a ridge line between the inclined surfaces.

[0002]

2. Description of the Related Art As a decorative member used for an interior member for a house, an opening member, and the like, a surface of a substrate 1 made of a medium density fiberboard (MDF) or a particle board (PB) is formed from a single veneer of wood. The one manufactured by bonding the veneer plate 2 is used. As shown in FIGS. 5 (b), 5 (c), and 5 (d), when the substrate 1 of the decorative member is provided with the inclined surfaces 3 provided at the ends of the four circumferences, the inclined surfaces adjacent to each other are used. A ridge 3a is formed between the ridges 3 and it is necessary to fit the protruding plate 2 at the ridge 3a. Therefore, conventionally, the projecting plate 2 is bonded to the surface of the substrate 1 by a method as shown in FIG.

That is, first, an adhesive is applied to either the front surface or the rear surface of the substrate 1 and the back surface of the veneer plate 2, and is naturally dried for half a day to one day until the adhesive is in a dry state. 7A, the veneer 2 cut to a larger size than the surface of the substrate 1 is superimposed on the surface of the substrate 1 as shown in FIG. Then, as shown in FIG. 7B, four corners of the protruding plate 2 are cut to form cuts 12, and as shown in FIG. It is bent along the inclined surface 3 and the protruding plate 2
Veneer 2 is formed on ridge 3a so that the cut 12
Along. Next, the overlapped portion of the cut 12 is cut and removed, and thereafter, the veneer 2 is bonded to the inclined surface 3 by applying a hot iron from above the four circumferential ends of the veneer 2,
As shown in FIG. 7D, a decorative member in which the veneer plate 2 is bonded to the surface of the substrate 1 can be manufactured.

However, in such a method, the substrate 1
It is necessary to perform two heat ironing operations on the flat surface portion 11 and on the inclined surface 3.
It is necessary to perform a cutting operation in order to insert 2 or to cut off an overlapped portion, and there is a problem that the operation is complicated. Therefore, it has been studied to bond the projecting plate 2 to the surface of the substrate 1 by using a vacuum press molding machine 10 formed of the pressing die 5 and the suction die 6 as shown in FIG. That is, the pressurizing mold 1 has a pressurizing chamber 1 whose lower surface is open.
5, an elastic sheet 4 made of silicon rubber or the like is stretched over an opening on the lower surface of the pressure chamber 15, and the pressure chamber 15 is sealed. A heater 16 is provided in the pressurizing chamber 15, and the pressurizing chamber 15 is connected to a pressurizing device such as a pressurizing pump via a pressurizing hole 17. The suction die 6 is provided with a large number of suction holes 18 penetrating vertically, and the suction holes 18 are connected to a pressure reducing device such as a suction pump.

Then, an adhesive is applied to either the front surface of the substrate 1 or the back surface of the veneer plate 2, and the veneer plate 2, which is cut to be larger than the front surface of the substrate 1, is superimposed on the surface of the substrate 1. After setting on the suction mold 6 as shown in FIG.
As shown in (b), when the pressure die 5 is clamped on the suction die 6 and the heater 16 is heated to suck the air from the suction hole 18 and pressurize the inside of the pressure chamber 15, the elastic sheet 4 is pulled from above. The pressing plate 2 is pressed along the surface of the substrate 1 by the pressure of below and the pressure reduction from below, and the pressing plate 2 is pressed along the surface of the substrate 1 by the elastic sheet 4 to apply the flat surface to the surface of the substrate 1. The projecting plate 2 can be bent and adhered from the portion 11 to the inclined surface 3.

[0006] As described above, the projecting plate 2 is made of the elastic sheet 4 and
Can be adhered along the inclined surface 3, so that the work of hot ironing or cutting as in the case shown in FIG. 7 becomes unnecessary, and the productivity is greatly improved.

[0007]

However, the above-mentioned elastic sheet 4 is easily deformed along the irregularities of the substrate 1.
It is made of a relatively soft silicone rubber having a hardness of about 40. For example, when there is a wrinkle 2a on the protruding plate 2 as shown in FIG. 9, the wrinkle 2a bites into the soft elastic sheet 4, and the wrinkle 2a is formed by the elastic sheet 4. There was a problem that it was not possible to fix by pressing and extending.

If the projecting plate 2 is formed to be larger than the surface of the substrate 1, the end of the projecting plate 2 protrudes outward from the end of the substrate 1 as shown in FIG. When the end of the projecting plate 2 is hooked on the end surface of the substrate 1, pressure is applied by the elastic sheet 4 (pressing is indicated by an arrow),
Cannot be bent along the inclined surface 3 of the substrate 1,
As shown in FIG. 10 (b), cracks 2
There is a problem that b occurs or the protruding plate 2 floats from the inclined surface 3 and cannot be brought into close contact.

[0009] The present invention has been made in view of the above points, it is possible to stick a veneer without wrinkles,
It is another object of the present invention to provide a method of bonding a veneer to a substrate, which does not cause cracks or floats in the veneer at a location on an inclined surface of the substrate.

[0010]

According to a first aspect of the present invention, there is provided a method for bonding a veneer plate to a substrate, comprising a slope 3 at an end portion around a surface and a ridge 3a between adjacent slopes 3. When the projecting plate 2 is bonded to the surface of the substrate 1 formed as described above, the projecting plate 2 formed to have substantially the same size as the surface of the substrate 1 is overlaid on the surface of the substrate 1 via an adhesive, A pressurizing mold 5 having a stretcher 4 and a suction mold 6 having a suction means
The substrate 1 and the protruding plate 2 are set so that the protruding plate 2 is on the side of the elastic sheet 4 and the substrate 1 is on the side of the suction die 6, and the protective sheet 7 having a hardness higher than that of the elastic sheet 4 is protruded from the protruding plate. 2 and the elastic sheet 4, and the protruding plate 2 is bonded to the surface of the substrate 1 by pressing the protruding plate 2 along the surface of the substrate 1 with the elastic sheet 4 via the protective sheet 7. Is what you do.

In the present invention, the protective sheet 7 preferably has a hardness of 70 or more. In the present invention, it is preferable that the veneer plate 2 is bonded to the surface of the substrate 1 when the adhesive is in a wet state. At this time, the adhesive can be brought into a wet state by supplying water to the protruding plate 2.

In the present invention, it is preferable to apply an adhesive to the back surface of the veneer plate 2. Further, in the present invention, it is preferable to use a veneer plate 2 provided with a backing on the back surface .

In the present invention, the inclined surface 3 at the end around the substrate 1 may be either a cubic curved surface or a secondary curved surface.

[0014]

According to the first aspect of the present invention, the projecting plate 2 is on the side of the elastic sheet 4 and the substrate 1 is between the pressing die 5 having the elastic sheet 4 and the suction die 6 having suction means. Is set, and a protective sheet 7 having a higher hardness than the elastic sheet 4 is interposed between the elastic plate 4 and the elastic sheet 4. Since the projecting plate 2 is pressed along the surface of the substrate 1 so that the projecting plate 2 is bonded to the surface of the substrate 1, even if the projecting plate 2 has a wrinkle 2a, the wrinkle 2a is protected by a high hardness protective sheet. 7, the wrinkles 2a of the protruding plate 2 can be eliminated. In addition, since the projecting plate 2 is formed to have substantially the same size as the surface of the substrate 1,
The end of the protruding plate 2 no longer protrudes outward more than the end of the substrate 1, and when the protruding plate 2 is pressed by the elastic sheet 4, the end of the protruding plate 2 may be caught on the end surface of the substrate 1. Disappears.

In addition, if the veneer plate 2 is adhered to the surface of the substrate 1 when the adhesive is in a wet state, the wet adhesive becomes a lubricant along the surface of the substrate 1 along the veneer plate 2.
Can be slid, and pressed with the protection sheet 7 to prevent
It is easy to extend the wrinkles 2a .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the invention of claim 1 will be described in detail with reference to embodiments. The veneer plate 2 is made of a thin slice of wood as shown in FIG. 5A, and is cut into the same size (and the same shape) as the surface of the substrate 1. When a thin plate having a thickness of about 0.2 to 0.4 mm or less is used as the projecting plate 2, cracks are prevented from occurring when the projecting plate 2 is bonded to the substrate 1, and the adhesive is applied to the surface of the projecting plate 2. In order to prevent the adhesive from seeping out, it is preferable to provide a backing in which a backing material such as Japanese paper or nonwoven fabric is attached to the back surface of the veneer plate 2. If the thickness is 0.4 mm or more, a backing may be applied as needed, and if the thickness is 0.6 mm or more, there is no need to apply the backing.

The substrate 1 is formed as shown in FIG.
As shown in (c) and (d), those produced by providing the inclined surfaces 3 at the four circumferential ends can be used, and the ridge lines 3a are formed between the adjacent inclined surfaces 3. The inclined surface 3 can be formed as a cubic curved surface such as a concave curved surface or a convex curved surface, or can be formed as a flat curved secondary curved surface. Substrate 1
The material is not particularly limited, and it can be made of any material such as a medium density fiberboard (MDF) and a particle board (PB).

In bonding the projecting plate 2 to the surface of the substrate 1, first, an adhesive is applied to at least one of the surface of the substrate 1 and the back surface of the projecting plate 2. Apply the adhesive with a spreader,
This can be performed by any method such as spraying, brushing, or coating with a roll. However, since the veneer plate 2 is flat, the veneer plate 2 is automatically passed through the roll coater 20 as shown in FIG. An adhesive can be applied to the back surface of the veneer plate 2. Therefore, when the application of the adhesive is performed automatically, it is preferable that the application of the adhesive is performed on the back surface of the veneer plate 2.

As the adhesive, an elastic and flexible adhesive such as a vinyl acetate adhesive such as urea vinyl acetate, urea melamine vinyl acetate or other modified vinyl acetate, or a urethane adhesive is preferably used. preferable. As a specific example of the adhesive, a modified vinyl acetate base agent ("Bond KV555" manufactured by Shoei Chemical Co., Ltd.) 20 parts by weight, urea ("UM96" manufactured by Aica Industries) 8 parts by weight, flour 8 parts by weight, water 3 parts by weight can be used. Further, as the adhesive, a sheet-like material impregnated with water or containing no water can be used.

On the other hand, as described above, the vacuum press molding machine 10 is formed from the pressing die 5 and the suction die 6,
A pressurizing chamber 15 having an opening at the lower surface is formed in the pressurizing mold 5, and a hardness (JIS: A hardness) of 20 to
Elastic sheet 4 made of about 50 silicone rubber (for example, hardness 40, thickness 2 mm, manufactured by Tigers Polymer Co., Ltd.)
The pressure chamber 15 is hermetically closed. A heater 16 is provided in the pressurizing chamber 15.
7 is connected to a pressurizing device such as a pressurizing pump. The suction die 6 is provided with a large number of suction holes 18 penetrating vertically, and the suction holes 18 are connected to a pressure reducing device such as a suction pump.

In bonding the projecting plate 2 to the surface of the substrate 1, first, as shown in FIG. 1B, the projecting plate 2 is overlaid on the surface (upper surface) of the substrate 1, and a protective sheet 7 is further overlaid thereon. As the protective sheet 7, a sheet having a hardness higher than that of the elastic sheet 4 is used. The hardness (JIS: A hardness) of the protective sheet 7 is preferably 70 or more, and the upper limit of the hardness is preferably 100. Further, it is preferable to use a protective sheet 7 which has an appropriate expansion and contraction performance and has a better sliding property with respect to the veneer plate 2 than the elastic sheet 4. Therefore, the protective sheet 7 is made of polytetrafluoroethylene ( (Teflon), polyvinyl chloride, or the like is preferably used. Further, the thickness of the protective sheet 7 is preferably about 0.5 mm to 1.1 mm. A specific example of such a protective sheet 7 is “Woody Floor PVC Sheet” manufactured by Iida Kasei Co., Ltd.
0 mm, backing of nonwoven fabric, hardness of 80 to 90).

After the veneer plate 2 and the protective sheet 7 are overlaid on the surface of the substrate 1 as described above, this is
Then, the pressing die 5 is clamped on the suction die 6 as shown in FIG. Then, while the heater 16 is generating heat, the elastic sheet 4 is sucked through the suction hole 18 to reduce the pressure on the lower side of the elastic sheet 4 and the compressed air is sent from the pressurizing hole 17 to pressurize the inside of the pressurizing chamber 15. Pressing the projecting plate 2 along the surface of the substrate 1 by pressing from below and depressurizing from below, presses the projecting plate 2 along the surface of the substrate 1 with the elastic sheet 4 and presses the projecting plate 2 onto the surface of the substrate 1. The projecting plate 2 can be bent and adhered from the flat portion 11 to the inclined surface 3. The molding conditions at this time are preferably set such that the heating temperature by the heater 16 is 140 to 180 ° C., the pressurizing time is 1 to 2 minutes, and the pressurizing pressure is 2 to 4 kgf / cm ² .

Here, as shown in FIG.
When pressing the projecting plate 2 along the surface of the substrate 1 to perform molding, a protective sheet 7 having a higher hardness than the elastic sheet 4 is interposed between the elastic sheet 4 and the projecting plate 2. 2A, when there is a wrinkle 2a on the protruding plate 2 as shown in FIG. 2A, the wrinkle 2a is pressed by the protection sheet 7 without biting into the protection sheet 7 having high hardness.
In order to prevent the wrinkles 2a from being generated, the protrusions 2
Can be bonded. Wrinkle 2 like this
In order to prevent a from penetrating into the protective sheet 7, the hardness is desirably 70 or more as described above. Further, when a material having good slipperiness with the veneer plate 2 is used as the protection sheet 7, the wrinkle 2a can be easily extended because the veneer plate 2 easily slides on the surface of the protection sheet 7.

Further, if the veneer 2 is adhered to the surface of the substrate 1 in a dry state in which the adhesive applied between the substrate 1 and the veneer 2 is dried, the slip between the substrate 1 and the veneer 2 is poor. It becomes difficult to extend the wrinkles 2a. For this purpose, FIG. 1 shows that the veneer 2 is adhered to the surface of the substrate 1 while the adhesive applied to both or one of the substrate 1 and the veneer 2 is wet.
It is preferable to carry out the molding of (d), and the wet adhesive can serve as a lubricant to improve the slip between the substrate 1 and the projecting plate 2 and facilitate the extension of the wrinkles 2a. If the adhesive is not dried in this manner, there is also an advantage that a drying space after applying the adhesive and the taking in and out of the drying device are not required.

In the case where an adhesive having a low moisture content or an adhesive which is dry at the time of molding is used, moisture is supplied from the surface of the veneer 2 by spraying or the like, and the veneer 2 is made flexible. Preferably, the adhesive is made wet, and the veneer 2 is bonded to the surface of the substrate 1. Further, if the veneer 2 is replenished with water to make the veneer 2 flexible as described above, it becomes easy to bend the veneer 2 along the surface of the substrate 1, and particularly to supply water to the veneer 2 at the ridge 3 a. By making the veneer flexible, it is possible to easily bend the veneer plate 2 at the ridge line 3a and prevent the veneer plate 2 from being cracked.

Further, since the protruding plate 2 is formed to have substantially the same size as the surface (upper surface) of the substrate 1, the end of the protruding plate 2 does not protrude much more outward than the end of the substrate 1. 10, the end of the protruding plate 2 projecting outward does not catch on the end face of the substrate 1, and the protruding plate 2 is arranged along the inclined surface 3 of the substrate 1 as shown in FIG. It can be held down by the elastic sheet 4, so that the projecting plate 2 does not crack or float at the inclined surface 3.

As described above, it is not necessary to perform the work of hot ironing and cutting as in the conventional example of FIG.
The protruding plate 2 can be adhered to the substrate, and the productivity can be reduced to about 500% (for example, the conventional method that required a time of
(Available in 0 seconds), while eliminating dangerous operations such as hot ironing and cutting, and eliminating appearance of cuts and irons and improving appearance.

When the thickness of the substrate 1 is not very large,
As shown in FIG. 4B, since the tension acting on the elastic sheet 4 is small, there is a possibility that the elastic sheet 4 may wrinkle.
May not be able to be pressed smoothly along.
In this case, as shown in FIG.
The jig frame 2 is placed on the upper surface of the suction die 6 so as to increase the height from the upper surface of the suction die 6 and surround the substrate 1.
2 is placed and the molding of FIG. 1D is performed. In this case, the elastic sheet 4 is stretched as shown in FIG.

According to the first aspect of the present invention, the elastic sheet 4
The protection sheet 7 having a higher hardness than the veneer 2 and the elastic sheet 4
And pressurizing the protruding plate 2 between them, but when the protruding plate 2 is bonded to the substrate 1 using an adhesive in a wet state, such a protective sheet 7 is not required. The wrinkles 2a of the protruding plate 2 can be extended and bonded.

That is , as shown in FIG. 6A, a protruding plate 2 having substantially the same size as the surface of the substrate 1 is placed on the surface of the substrate 1 and then set on the suction mold 6, and then, as shown in FIG. The pressure die 5 is clamped on the suction die 6 as shown in FIG. Then, while the heater 16 is generating heat, the elastic sheet 4 is sucked through the suction hole 18 to reduce the pressure on the lower side of the elastic sheet 4 and the compressed air is sent from the pressurizing hole 17 to pressurize the inside of the pressurizing chamber 15. The projecting plate 2 is pressed along the surface of the substrate 1 by the elastic sheet 4 by pressing the projecting plate 2 along the surface of the substrate 1 by pressing from below and depressurizing from below. The projecting plate 2 can be bent and adhered from the portion 11 to the inclined surface 3. The molding conditions at this time are preferably set in the same manner as in FIG.

Here, while the adhesive applied to both or one of the substrate 1 and the projecting plate 2 is wet, the molding shown in FIG. 6B for bonding the projecting plate 2 to the surface of the substrate 1 is performed. If the adhesive is wet, the adhesive can serve as a lubricant to improve the slip between the substrate 1 and the veneer 2,
When pressing the veneer plate 2 with the elastic sheet 4, the wrinkle 2 a of the veneer plate 2
The portion 2 is easily slipped on the surface of the substrate 1 so that the wrinkles 2a can be easily extended. Therefore, it is not necessary to use the protective sheet 7 having high hardness, and the elastic sheet 4 can be used to extend the wrinkles 2a of the projecting plate 2 and adhere to the substrate 1. Can be done. The same adhesive as that used in the case of FIG. 1 can be used as the adhesive.

Although it is not necessary to use the protective sheet 7 having a high hardness as described above, it is preferable to use an elastic sheet 4 having a rubber hardness (JIS: A hardness) higher than that of a conventional elastic sheet. It is preferable to use the elastic sheet 4. Specific examples of such an elastic sheet 4 include silicone rubber having a hardness of 50 manufactured by Kureha Chemical Co., Ltd. In addition, the protruding plate 2 is sprinkled with water or the like at the location of the ridge line 3a of the substrate 1 by spraying or the like, and the end of the protruding plate 2 is moistened to be flexible, thereby facilitating the bending of the protruding plate 2 at the location of the ridge line 3a. Thus, it is possible to prevent cracks from being generated in the veneer plate 2.

[0033]

As described above, according to the first aspect of the present invention, the projecting plate is adhered to the surface of the substrate formed with the inclined surface at the end around the surface and the ridge between the adjacent inclined surfaces. In doing so, a veneer plate formed approximately the same size as the surface of the substrate is placed on the surface of the substrate via an adhesive, and a veneer plate is provided between the pressure type having an elastic sheet and the suction type having suction means. On the elastic sheet side, set the substrate and the veneer so that the substrate is on the suction type side, and interpose a protective sheet having higher hardness than the elastic sheet between the veneer and the elastic sheet, and protect with the elastic sheet By pressing the veneer along the surface of the substrate through the sheet, the veneer is bonded to the surface of the substrate, so that even if wrinkles occur in the veneer, the wrinkles do not bite into the elastic sheet and have high hardness Hold with protective sheet It is possible to extend the wrinkles of the veneer with a protective sheet and stick the veneer without wrinkles, and the end of the veneer does not protrude much more outward than the end of the board, so the end of the veneer This prevents the portion from being caught on the end face of the substrate, and prevents the protruding plate from cracking or floating at the inclined surface.

Further, since the veneer is bonded to the surface of the substrate when the adhesive is in a wet state, the veneer can be slid along the surface of the substrate as a wet adhesive as a lubricant. It is easy to remove wrinkles by holding down with a protective sheet to extend wrinkles of the veneer. In addition, since the veneer with a backing is used on the back side, the backing can prevent cracks from occurring when the veneer is bonded to the substrate and the adhesive from oozing on the surface of the veneer. It is easy to use a thin veneer.

[0035]

[Brief description of the drawings]

FIG. 1 shows each step of an embodiment of the present invention,
(A) and (b) are perspective views, and (c) and (d) are cross-sectional views.

FIG. 2 shows one step of the above, wherein (a),
(B) is a sectional view.

FIG. 3 is a sectional view showing one step of the above.

FIG. 4 shows another embodiment of the present invention, in which (a)
Is a perspective view, and (b) and (c) are sectional views.

5A is a perspective view of an example of a veneer plate, FIG.
(C) and (d) are a front view, a side view, and a plan view of an example of the substrate.

FIGS. 6A and 6B show steps of another embodiment of the present invention, and FIGS. 6A and 6B are cross-sectional views.

FIG. 7 shows a conventional example, and (a) to (d) are perspective views of respective steps.

FIGS. 8A and 8B show another conventional example, in which FIGS.
Is a sectional view.

FIG. 9 is a cross-sectional view showing a problem of the conventional example.

FIG. 10 illustrates another problem of the conventional example.
(A), (b) is a sectional view, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Protruding plate 3 Inclined surface 3a Ridge line 4 Elastic sheet 5 Pressurization type 6 Suction type 7 Protection sheet

Continuation of the front page (56) References JP-A-2-277602 (JP, A) JP-A-56-78910 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27D 5 / 00 B27M 3/00

Claims (6)

(57) [Claims] When bonding a projecting plate to a surface of a substrate formed with an inclined surface at an end around the surface and having a ridge between adjacent inclined surfaces, the size of the surface is substantially the same as the size of the surface of the substrate. The projecting plate formed in the size is superimposed on the surface of the substrate via an adhesive, and the projecting plate is on the side of the elastic sheet between the pressing type having an elastic sheet and the suction type having the suction means, and the substrate is of the suction type. The veneer and the veneer are set so that they are on the side, and a protective sheet having a higher hardness than the elastic sheet is interposed between the veneer and the elastic sheet. Bonding the veneer to the surface of the substrate by applying pressure to the surface of the substrate. 2. The method according to claim 1, wherein the hardness of the protective sheet is 70 or more. 3. The method for bonding a veneer to a substrate according to claim 1, wherein the veneer is bonded to the surface of the substrate when the adhesive is in a wet state. 4. The method for bonding a veneer to a substrate according to claim 3, wherein the adhesive is brought into a wet state by supplying water to the veneer. 5. The method for bonding a veneer to a substrate according to claim 1, wherein an adhesive is applied to the back surface of the veneer. 6. The method for bonding a veneer to a substrate according to claim 1, wherein a veneer having a backing provided on a back surface is used.