JP2005335283A - Woody decorative sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide, in pasting a woody decorative sheet comprising a woody lamina continuously from a surface to an end face of the base material of furniture and the like through the lapping work or the V-cut work of decorative materials, a woody decorative sheet capable of letting the woody feel or texture, that the woody lamina has, appear without causing damages to the woody lamina such as breakage. <P>SOLUTION: The woody decorative sheet A is provided, wherein flexibility is imparted by subjecting the woody lamina 1 to the compression treatment with a heating/pressing roll and bringing about a plurality of cracks 2 extending from the surface to the inside, and wherein scratch resistance is imparted and at the same time the woody feel, texture and the like are made to show by subjecting the surface of this woody lamina 1 to the brushing treatment to render the aperture portions of the conduits and the like, which have been made to the closed state by the above compression treatment, into the open state, then coating the surface with a soft synthetic resin to let it intrude into the cracks 2 and fill 3, and forming a thin surface coating layer 4 on the surface of the woody lamina 1 by the soft synthetic resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a surface material of an opening member such as a door of a building, a sliding door, a folding door, a surface material of an interior material, a door or a surface material of various storage furniture, a baseboard, a peripheral edge, a parting member, a window frame member, a staircase, etc. The present invention relates to a woody decorative sheet suitable for use as a surface material of a construction material such as a member, and a method for producing the same.

  Conventionally, a so-called lapping process or a V-cut decorative material process is known as a surface decoration method for opening members, interior materials, artificial materials, storage furniture, and the like. In these methods, a flexible decorative sheet made of synthetic resin or paper is used for lapping, and the back side of the bent portion of the decorative plate with a thin plywood lined on the back of the flexible decorative sheet for V-cut decorative material processing. Using a decorative material that is cut into a V shape leaving a decorative sheet, the base material is continuously bent with an angle of 90 degrees or near from the surface to the side surface of the base material such as the opening member. It is what coats.

  However, when using a wooden decorative veneer as a decorative sheet, the wooden decorative veneer is more rigid than a flexible decorative sheet such as the synthetic resin sheet when bent at an angle of 90 degrees or close to it as described above. For this reason, there has been a problem that the wooden decorative veneer is damaged such as cracks.

  Also known is a wooden veneer veneer that is reinforced with a nonwoven fabric on the back, and a transparent paint is applied to the surface to prevent cracks and cracks. Even if it is used, its flexibility is insufficient. Therefore, when the above wrapping process or V-cut decorative material process is performed, breakage such as cracks or clouding of the coating film can be prevented from occurring in the bent part. There wasn't.

Also, as described in Patent Document 1, a soft water-based paint is applied to the surface of a wood veneer to give flexibility and eliminate the generation of VOC (volatile organic compounds). It has been.
JP 2002-126635 A.

  However, even in this case, since the soft water-based paint hardly penetrates into the wooden decorative veneer, the wooden decorative veneer itself is not given flexibility. For this reason, unless the coating amount of the soft water-based paint on the surface is increased very much, it is not possible to sufficiently prevent cracking of the wood veneer veneer when the bending process such as the lapping process is performed.

  Furthermore, applying a large amount of water-based paint to the surface of a wood veneer is not only uneconomical, but also the paint fills the holes of the wood veneer veneer and temporary ducts. There was a problem that the wood texture and texture peculiar to the wood veneer veneer disappeared due to the thickness becoming too thick, and the design value was remarkably reduced.

  The present invention has been made in view of such problems, and in particular, when sticking a wooden decorative sheet made of a wooden thin plate continuously by lapping or V-cut decorative material processing from the surface of the base material to the end face, It is an object of the present invention to provide a wood decorative sheet and a method for producing the same, which can reveal the wood texture, texture, etc. of the wood thin plate without causing breakage such as cracks in the wood thin plate.

  In order to achieve the above object, the wood decorative sheet of the present invention, as described in claim 1, is filled with a soft synthetic resin in the many cracks of the wooden thin plate on which many cracks are formed. On the surface of the wood thin plate, a coating layer made of a soft synthetic resin of the same quality as the soft synthetic resin filled in the numerous cracks is continuously integrated with the soft synthetic resin filled in the numerous cracks. Has a structure.

  In the wood decorative sheet thus configured, the invention according to claim 2 is characterized in that the soft synthetic resin has an elongation of 100% or more, or a tensile strength of 15 MPa or more, and the invention according to claim 3 The soft synthetic resin is a moisture curable urethane-based hot melt resin or an aqueous urethane resin.

  The invention according to claim 4 is a method for producing the wood decorative sheet, wherein the wood thin plate is subjected to a compression treatment by passing between at least a pair of upper and lower pressure rolls, and a number of cracks are generated in the wood thin plate, Next, a soft synthetic resin is applied from the surface and a part thereof is infiltrated and filled into the many cracks, and a coating layer is formed on the surface of the wooden thin plate with the remaining soft synthetic resin.

  In the method for manufacturing a wood decorative sheet, the invention according to claim 5 is characterized in that the pressure roll for compressing the wood thin plate is a hot-pressing roll, and the invention according to claim 6 is a wood thin plate before compression. The thickness of the sheet is in the range of 0.15 mm to 0.4 mm, and this wood sheet is pressed so that the thickness is reduced by 5 to 40%. Further, the invention according to claim 7 is characterized in that the surface of the wood thin plate before the application of the soft synthetic resin is brushed after compression, and the hole portion of the conduit or the like of the wood thin plate is subjected to opening treatment.

  In the wood decorative sheet manufacturing method, the invention according to claim 8 is characterized in that the soft synthetic resin has an elongation of 100% or more or a tensile strength of 15 MPa or more, and the invention according to claim 9 Is characterized in that the soft synthetic resin is a moisture-curable urethane-based hot melt resin or an aqueous urethane resin.

  According to the wood decorative sheet of the first aspect of the invention, the soft synthetic resin coating layer applied to the surface of the wood thin plate, and the soft synthetic resin is filled in many cracks and cracks formed in the wood thin plate. Combined with the flexibility imparted to the wooden thin plate itself, even if it is bent at an angle of 90 degrees or close to it, breakage such as cracking does not occur, and it is excellent in lapping and V cut decorative material processing. In addition, since the coating layer made of soft synthetic resin is continuously integrated with the same quality soft synthetic resin filled in the cracks, it can be firmly integrated so that the coating layer does not peel off from the surface of the thin wooden board. Thus, it is possible to further improve the above-mentioned bending processing suitability.

  In addition, since a soft coating layer is formed on the surface of the wooden thin plate, it is excellent in scratch resistance, and furthermore, the wooden thin plate itself is given flexibility due to numerous cracks, so the coating layer is thin. It is possible to obtain a wood decorative sheet that is well economical and has a good design that does not impair the wood texture and texture of the wood decorative veneer, such as a conduit or temporary conduit.

  According to the wood decorative sheet according to the invention of claim 2, since the soft synthetic resin has an elongation of 100% or more or a tensile strength of 15 MPa or more, the effect of the invention of claim 1 is further ensured and good. Can be.

  According to the wooden decorative sheet according to the invention of claim 3, since the soft synthetic resin is a moisture curable urethane hot melt resin or an aqueous urethane resin, in addition to the effects of the invention of claim 1 or claim 2 Thus, no VOC is produced during production or use, and the toughness against bending can be further increased.

  According to the method for producing a wooden decorative sheet according to the invention of claim 4, first, a number of cracks are generated in the wooden thin plate by compressing the wooden thin plate by passing between a pair of upper and lower pressure rolls. Flexibility can be easily and continuously imparted to the wood thin plate, and then, a soft synthetic resin is applied from the surface of the wood thin plate, and a part thereof is infiltrated and filled into the many cracks. The remaining soft synthetic resin forms a coating layer on the surface of the wooden thin plate, so that the soft synthetic resin filled in the crack and the soft synthetic resin coating layer on the surface are continuously integrated and peeled off from the surface of the wooden thin plate. A coating layer without fear can be easily formed, and a woody decorative sheet having the structure and effect of the invention of claim 1 can be manufactured with extremely high productivity.

  According to the method for producing a wooden decorative sheet according to the invention of claim 5, in the invention of claim 4, a hot press roll is used as a pressure roll for compressing the wood thin plate. In addition to the effects of the invention, innumerable cracks can be formed smoothly and efficiently without causing damage to the wooden thin plate.

  According to the method for producing a wooden decorative sheet according to the invention of claim 6, in the invention of claim 4 or 5, the thickness of the wood sheet before pressing is in the range of 0.15 mm to 0.4 mm. In addition to the effect of the invention of claim 4 or claim 5, in addition to the effect of the invention of claim 4 or 5, the depth of the wood sheet appears, In addition, it is possible to obtain a wooden decorative sheet that does not cause breakage such as cracks during lapping, and in order to obtain such a wooden decorative sheet, the wooden thin plate is in a state in which good cracks are generated in the wooden thin plate. Can be clamped.

  According to the method for producing a wooden decorative sheet according to the invention of claim 7, in the invention according to any one of claims 4 to 6, the surface of the wood thin plate before applying the soft synthetic resin is brushed. Therefore, it is possible to open the holes of conduits etc. that have been closed due to crushing due to pressing, etc., and to open them by brushing. A decorative sheet can be produced.

  According to the method for producing a woody decorative sheet according to the invention of claim 8, in the invention according to any one of claims 4 to 7, the soft synthetic resin has an elongation of 100% or more, or a tensile strength. Therefore, a woody decorative sheet having excellent flexibility and sufficient strength against deformation at the time of bending can be produced with good productivity and high productivity.

  According to the method for producing a woody decorative sheet according to the invention of claim 9, in the invention according to any one of claims 4 to 8, as the soft synthetic resin, a moisture curable urethane hot melt resin, Or since the water-based urethane resin is used, the wood decorative sheet which does not generate | occur | produce VOC and can further improve the toughness with respect to a bending process can be manufactured efficiently.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is an exemplification, and the present invention is not intended to be limited by this embodiment.

  FIG. 1 is a simplified longitudinal side view of a part of a wood decorative sheet A according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part thereof, as apparent from these FIGS. In addition, the wooden decorative sheet A includes a wooden thin plate 1 in which a large number of cracks 2 are formed on the entire surface, and a soft synthetic resin filling portion 3 filled in the numerous cracks 2 formed in the wooden thin plate 1. A thin-film soft synthetic resin formed on the surface of the wooden thin plate 1 and made of a soft synthetic resin of the same quality as the soft synthetic resin filled in the numerous cracks 2 and continuously integrated with the soft synthetic resin filling portion 3 The covering layer 4 is formed.

  The wood thin plate 1 in which many cracks 2 are formed is obtained by pressing and compressing the wood thin plate 1 ′ (shown in FIG. 5) before the crack formation treatment in the thickness direction. As such a woody thin plate 1 ′, a woody veneer veneer such as a hardwood veneer, a conifer veneer or an artificial wood veneer sliced to a thickness of 0.15 to 0.4 mm can be suitably used. .

  Here, when the thickness of the wood thin plate 1 ′ before the crack formation processing, that is, before the pressing treatment is less than 0.15 mm, the feeling of depth of the pressed wooden thin plate 1 disappears, which is preferable for design. In addition, if the thickness of the wood sheet 1 ′ before the pressing process is 0.4 mm or more, the rigidity of the pressed wooden sheet 1 itself is increased, so that damage such as cracks occurs during lapping or V-cut decorative material processing. Is likely to occur, which is not preferable.

  Examples of the soft synthetic resin that fills the crack 2 of the wooden thin plate 1 and forms the coating layer 4 on the surface of the wooden thin plate 1 include urethane resin, vinyl acetate resin, polyester, acrylic resin, and latex. In particular, it is desirable that the elongation after curing is 100% or more, or the tensile strength is 15 MPa or more. If the elongation is less than 100% and the tensile strength is less than 15 MPa, the resulting woody decorative sheet A is not preferable because its flexibility and strength against deformation at the time of bending are insufficient. Among the above soft synthetic resins, moisture-curing urethane hot-melt resin or water-based urethane resin does not emit VOC (volatile organic compound), and has a tough flexibility and scratch resistance on the wooden decorative sheet A. Is preferable.

  FIGS. 3 and 4 show decorative processing materials B and B1 obtained by continuously wrapping the end surfaces from the surfaces of the base materials 50 and 53 such as an opening member and furniture using the wooden decorative sheet A and processing V-cut decorative materials, respectively. The partial figure of the example of is shown. In the decorative material B shown in FIG. 3, the wooden decorative sheet A is bonded to the base material 50 by the adhesive 51 from the surface 50a of the base material 50 to the end face 50c through the corner portion 50b having a small radius of curvature. Since it is lapped and given sufficient flexibility and strength to the woody decorative sheet A, there is no breakage or breakage in the bent part 52 at the corner part 50b, and its surface is made of soft synthetic resin. The coating layer 4 is protected with good scratch resistance.

  The decorative material B1 in FIG. 4 is an example of V-cut decorative material processing, and a wooden decorative sheet A is adhered to the surface of the wooden substrate 54 with an adhesive 51a, and the back surface side of the wooden substrate 54 corresponding to the bent portion 55 thereof. V-cut decorative material C obtained by V-cutting 56 until it reaches the vicinity of the back surface of the wooden decorative sheet A is bonded by an adhesive 51b from the surface 53a of the base material 53 to the end surface 53c through the corner portion 53b. In the corner portion 53b of the material 53, the V-cut decorative material is processed by being bent so that the V-cut 56 of the V-cut decorative material C to which the wooden decorative sheet A is adhered comes into contact. Also in this decorative processed material B1, since sufficient softness and strength are imparted to the wooden decorative sheet A, there is no breakage such as cracks in the bent portion 55, and the surface is made of soft synthetic resin. The coating layer 4 is protected with good scratch resistance.

  Next, the manufacturing method of the wooden decorative sheet A will be described with reference to FIGS. FIG. 5 shows a state in which a wood thin plate 1 in which a large number of cracks 2 are generated from the surface to the inside is formed by passing the wood thin plate 1 'through a pair of upper and lower hot-pressing rolls 20a and 20b and hot-pressing. Indicates.

  The wood thin plate 1 ′ before pressing used here is not particularly limited, but, as described above, a hardwood veneer, a softwood veneer, or an artificial tree sliced to a thickness of 0.15 to 0.4 mm. A wood veneer veneer such as a wood veneer can be suitably used. In addition, a plurality of such wood thin plates 1 'can be used as the wood thin plate 1' in which side end surfaces thereof are continuously joined by a bad joint or a finger joint.

  In addition, a reinforcing sheet such as a non-woven fabric can be attached to the back surface of the thin wood plate 1 ′ to reinforce the back surface. Furthermore, the surface of the wood thin plate 1 ′ can be preliminarily colored, decolored, or directly printed to improve the wood texture and texture.

  In such a pressing process using the hot-pressing rolls 20a and 20b, the hot-pressing rolls 20a and 20b heated to room temperature or higher and 180 ° C. or lower are used so that the wood thin plate 1 ′ is not deteriorated or altered in wood components. It is desirable to do this. Further, the thickness reduction rate of the wood sheet 1 that has caused many cracks after the pressing process is within a range of 5% to 40% with respect to the thickness of the wood sheet 1 ′ before the pressing process. It is desirable to adjust the clear lath between the pressure rolls 20a and 20b.

  When the thickness reduction rate is less than 5%, the crack 2 generated in the wooden thin plate 1 is insufficient and the flexibility of the wooden thin plate 1 itself is insufficient, and the soft synthetic resin that penetrates into the crack described later is also reduced. Since the softness of the woody decorative sheet A is insufficient, it is not preferable. On the other hand, if the reduction rate in the thickness direction exceeds 40%, the wooden thin plate 1 itself becomes too dense, and the penetration of the soft synthetic resin into the crack 2 is insufficient, which gives the wooden decorative sheet A sufficient flexibility. This is not preferable because it becomes difficult, and the damage to the wooden thin plate 1 becomes too great, which impairs the design.

  Note that such a hot-pressing process can be performed by using a plurality of pairs of hot-pressing rolls 20a and 20b and making the press-pressing frequency a plurality of times so that the pressure is gradually increased. In this way, the pressing process by continuously passing the wood sheet 1 'between the plural pairs of hot-pressing rolls 20a, 20b whose clearance is gradually narrowed causes a large number of cracks 2 to occur in the wood sheet 1 with high productivity. This is preferable. In addition, a large number of cracks 2 can be generated in the thin wood plate 1 by a pressing process using a cold pressure roll, or a pressing process using a flat plate press or a flat plate hot press.

  Next, the surface of the wood thin plate 1 in which the numerous cracks 2 are generated is brushed with a roll brush 21 as shown in FIG. The pressed woody thin plate 1 may have a clogged hole such as a conduit or a temporary conduit due to partial crushing due to the pressing, and this brushing process may cause clogging. It is possible to make a hole in an open state from which clogging has been removed from a hole in a proper state.

  Therefore, by this brushing treatment, the presence of the conduit or temporary conduit of the wood thin plate 1 becomes clearer, and the wood decorative sheet A in which the wood texture and texture of the wood thin plate 1 are not impaired can be formed. In addition, it is possible to further facilitate infiltration and filling of the soft synthetic resin into a large number of cracks 2 of the wood thin plate 1 described later.

  As the above-mentioned roll brush 21 for brushing the surface of the thin wood plate 1, for example, a metal brush such as stainless steel or brass can be adopted, the wire diameter is 0.1 mm to 1.0 mm, and the length of the bristle is 10 mm. Those having a thickness of about 80 mm can be suitably used.

  Further, the surface of the wood thin plate 1 may become fluffy due to this brushing treatment. In such a case, in the subsequent process of the roll brush 21, brushing is performed with a synthetic resin brush such as a thin and long nylon brush. It can be lost.

  The wood thin plate 1 having a large number of cracks 2 thus obtained has a clear hole portion such as a conduit or a temporary conduit, and has a flexible sheet shape whose rigidity is remarkably reduced by the large number of cracks 2. ing.

  Next, a soft synthetic resin is applied to the surface of the wood thin plate 1 obtained in this way, and the soft synthetic resin is formed inside the numerous cracks 2 generated in the wood thin plate 1 as shown in FIG. A part of the resin is infiltrated and filled, and the remaining soft synthetic resin forms a soft synthetic resin coating layer 4 on the surface of the wooden thin plate 1 so as to be continuously integrated with the soft synthetic resin infiltrated and filled into the numerous cracks 2 described above. To do.

  As the soft synthetic resin used herein, those having an elongation percentage after curing of 100% or more or a tensile strength of 15 MPa or more are suitable as described above. If both the elongation and the tensile strength of the soft synthetic resin are less than the above values, breakage such as cracks in the bent part and white turbidity in the coating layer 4 occur during lapping and V-cut decorative material processing. Sometimes.

  The kind of the soft synthetic resin is not particularly limited, but a urethane-based soft synthetic resin is preferable because it is strong and hardly damaged. In particular, moisture-curing urethane-based hot melt resins or water-based urethane resins are preferable because they do not contain an organic solvent and therefore do not cause VOCs and do not deteriorate the production environment or use environment. Further, when such a soft synthetic resin is used, it is preferable to use a non-yellowing type or a hardly yellowing type in order to prevent discoloration of the wooden decorative sheet A.

  Hereinafter, the case where the moisture hardening type urethane type hot melt resin 23 is apply | coated to the surface of the wooden thin board 1 which has many cracks 2 is demonstrated. In this case, as shown in FIG. 7, the hot melt resin 23 is heated to the melting temperature or higher and melted, and the molten resin 23 is applied to the surface of the wood thin plate 1 using a roll coater 22 for applying the hot melt resin. Apply.

Here, the coating amount of the moisture-curable urethane hot-melt resin 23 is preferably set to 20g / m ² ~70g / m ² approximately on a solid basis. If the coating amount is less than 20 g / m ² , the coating layer 4 formed on the surface of the wood thin plate 1 becomes too thin, which may cause problems such as tearing of the coating film during wrapping or V-cut cosmetic processing. It is not preferable. If the coating amount exceeds 70 g / m ² , the soft synthetic resin is buried in the holes of the conduits and temporary conduits and the coating thickness becomes too thick. Is unfavorable and uneconomical.

  Next, a release sheet 24 is placed on the application surface of the hot-melt resin 23 of the wood thin plate 1 to which the moisture-curable urethane-based hot-melt resin 23 is applied, and the surface is heated by a hot-pressure roll 25 as shown in FIG. The hot melt resin 23 is heated and pressed at a temperature equal to or higher than the melting temperature of the melt resin 23, and the hot melt resin 23 is infiltrated and filled into a large number of cracks 2 of the wood thin plate 1.

  The hot-pressing roll 25 can be a rubber roll such as silicon rubber or a steel roll. The hot-pressing condition is that the temperature is 80 ° C. to 150 ° C. and the pressure is about 10 to 100 N / cm. Can do.

  When a soft synthetic resin other than the hot melt resin, for example, an aqueous urethane resin, is used, it is not particularly necessary to infiltrate and fill the many cracks 2 of the thin wood plate 1 with the hot pressure roll 25. After infiltrating and filling by applying urethane resin, it may be dried, but foaming or fluffing may occur in the coating layer 4 after drying. The foaming and fluffing can be eliminated and kept smooth by hot pressing.

  The woody decorative sheet A thus obtained can be used as it is as a decorative material for wrapping and V-cut decorative material processing. Furthermore, the surface of the wooden decorative sheet A is polyester-based, urethane-based, epoxy-based. Applying an acrylic synthetic resin paint that does not significantly reduce the softness of the wood decorative sheet A, particularly a solvent-free or water-based soft synthetic resin paint, to further enhance the surface protection. You can also. In addition, it is preferable to use an ultraviolet ray or electron beam curing type paint as such a coating because the productivity is further increased. Next, specific examples and comparative examples of the present invention will be shown.

[Example 1]
Many veneer veneer single plates of 0.20 mm thickness were cascaded by finger joints, and a non-woven fabric (0.05 mm thickness) was stuck on the back surface to obtain a long and continuous veneer sheet. The moisture content of this veneer sheet was 7% by weight. Next, the clearance between the first pair of upper and lower hot-pressing rolls was adjusted to 0.05 mm, and the clearance between the second pair of upper and lower hot-pressing rolls was adjusted to 0.025 mm, and each was heated to 130 ° C. Passing between the two pairs of hot-pressing rolls at a speed of 30 m / min, a veneer sheet with a thickness of 0.2 mm (thickness reduction rate 20%) of the veneer single plate part is obtained and has a large number of cracks inside. This veneer sheet was wound around an unwinding roll.

  Next, this veneer sheet is fed by a stainless steel wire brush with a wire diameter of 0.15 mm and a length of 55 mm in the middle from the feed roll at a speed of 30 m / min. The surface of each was brushed, and the compressed conduit portion was dug to reveal a concave portion.

Next, a moisture curable urethane-based hot melt resin having a melt viscosity of 1500 mPa · s at 120 ° C., an elongation of 80%, and a tensile strength of 20 MPa is heated and melted to 120 ° C. on the surface of the veneer sheet, 40 g / m ^{2 in} terms of solid content was applied with a roll coater for hot melt.

Next, after releasing release paper on this coated surface, it is continuously pressed with a silicon rubber roll heated to 120 ° C. at a linear pressure of 40 N / cm. A wooden decorative sheet with a hot melt resin coating layer remaining on the surface is obtained, and a soft solventless urethane-based UV coating is applied to the surface of the wooden decorative sheet at a rate of 20 g / m ^2. A woody decorative sheet with a cross section of the conduit groove appearing on the surface was obtained.

  The wood decorative sheet thus obtained is bonded with an adhesive using a normal lapping laminating machine from the surface of the base material of the decorative panel having corners formed at right angles to the end surface, and lapping is performed. It was. As a result, the wooden decorative sheet is not broken, cracked, or clouded in the corners that are the bent portions of the wooden decorative sheet, and the wooden decorative sheet is continuous from the surface of the base material of the decorative panel to the end face. And was able to wrap with good productivity.

  In addition, after attaching the wood decorative sheet obtained above to the surface of a 9.0 mm thick MDF base material using a water-based adhesive, the wood decorative sheet is at least deep enough to remain on the back surface of the base material. A V-groove with an opening angle of about 90 degrees is formed on a V-cut decorative material by cutting the V-cut decorative material, and the V-cut decorative material is applied from the surface to the end face of the decorative panel whose corners are formed at right angles. The corner surface and the inner surface bent from the V-groove were brought into contact with each other and adhered with an adhesive to perform V-cut decorative material processing. Also in this V-cut decorative material processing, as in the case of the wrapping processing, the wooden decorative sheet was stuck without causing damage such as cracks, cracks or cloudiness at the corners that are the bent portions. The V-cut decorative material could be processed with good productivity.

[Example 2]
The same coating amount as that of Example 1 in terms of solid content was applied to the surface of a brushed veneer sheet obtained in the same manner as in Example 1 using a spray coater with an aqueous urethane resin having an elongation of 150% and a tensile strength of 10 MPa. After being coated to dry, the aqueous urethane resin is infiltrated and filled into the cracks of the veneer veneer, and a coating layer of the aqueous urethane resin is formed on the surface. After stacking release paper, a wooden decorative sheet with a smooth surface free of fuzz and foam marks is obtained by continuously pressing with a silicon rubber roll heated to 120 ° C at a linear pressure of 40 N / cm. Further, a flexible urethane-based solventless UV coating was applied to the surface in the same manner as in Example 1 at 20 g / m ² to obtain a woody decorative sheet in which the cross section of the conduit groove appeared on the surface.

  Next, this wood decorative sheet was subjected to lapping and V-cut decorative material processing in the same manner as in Example 1. As in Example 2, there was no damage such as cracks, cracks, or cloudiness, and production. The wrapping process and the V-cut decorative material process could be performed with good performance.

[Comparative example]
A woody decorative sheet according to a comparative example was obtained in the same manner as in Example 1 except that hot pressing with a hot pressing roll for generating a large number of cracks was not performed. The obtained wooden decorative sheet was free of many cracks, and therefore, most of the applied moisture-curing urethane hot melt resin formed a coating layer on the surface of the wooden thin plate.

  When the obtained wood decorative sheet according to the comparative example was subjected to lapping and V-cut decorative material processing in the same manner as in Example 1, cracks were generated in the corner of the bent portion. It was.

The simplified vertical side view of a part of a woody decorative sheet. The expanded sectional view of the principal part. The simplified vertical side view of the state which gave the lapping process. The simple vertical side view of the state which gave V cut cosmetics processing. The simplified vertical side view of the state which has caused the crack. The simplified vertical side view of the state which is carrying out the brushing process. The simple vertical side view of the state which has apply | coated soft synthetic resin to the surface. The simplified longitudinal section side view of the state which has made soft synthetic resin enter and fill in a crack.

Explanation of symbols

A Woody decorative sheet 1 Woody thin plate 2 Cracked part 3 Soft synthetic resin filling part 4 Soft synthetic resin coating layer
20a, 20b hot pressing roll
21 Roll brush
22 Roll coater
23 Hot melt resin

Claims (9)

  The soft synthetic resin is filled in the many cracks of the wooden thin plate in which many cracks are formed, and the soft synthetic resin having the same quality as the soft synthetic resin filled in the many cracks is filled on the surface of the wooden thin plate. A woody decorative sheet, wherein a coating layer made of a resin is continuously integrated with the soft synthetic resin filled in the numerous cracks.   The woody decorative sheet according to claim 1, wherein the soft synthetic resin has an elongation of 100% or more or a tensile strength of 15 MPa or more.   3. The woody decorative sheet according to claim 1, wherein the soft synthetic resin is a moisture-curable urethane-based hot melt resin or an aqueous urethane resin.   The wooden thin plate is subjected to a compression treatment by passing between at least a pair of upper and lower pressure rolls to cause a large number of cracks in the wooden thin plate, and then a soft synthetic resin is applied from the surface, and a part of the crack is applied A method for producing a woody decorative sheet, characterized in that the crack is infiltrated and filled, and a coating layer is formed on the surface of the woody thin plate with the remaining soft synthetic resin.   The method for producing a woody decorative sheet according to claim 4, wherein the pressure roll for compressing the woody thin plate is a hot pressure roll.   The thickness of the wood sheet before compression is in the range of 0.15 mm to 0.4 mm, and the wood sheet is pressed so that the thickness is reduced by 5 to 40%. The manufacturing method of the woody decorative sheet of description.   7. The surface of the wood thin plate before application of the soft synthetic resin is brushed after being compressed, and a hole such as a conduit of the wood thin plate is subjected to opening treatment. Manufacturing method of wooden decorative sheet.   The method for producing a woody decorative sheet according to any one of claims 4 to 7, wherein the soft synthetic resin has an elongation of 100% or more or a tensile strength of 15 MPa or more.   The method for producing a woody decorative sheet according to any one of claims 4 to 8, wherein the soft synthetic resin is a moisture-curable urethane-based hot melt resin or an aqueous urethane resin.

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