JP2013127188A - Floor material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor material that can prevent a woodgrain pattern of a laminated wood from appearing on a surface even though being repeatedly left in a dry or humid condition, and uses a laminated wood formed of a cedar material.SOLUTION: A floor material 10 comprises: a cedar laminated wood 1 formed by laminating and bonding a plurality of veneer sheets 1a-1e made of a cedar material; a wood-fiber sheet 2 bonded on a surface of the cedar laminated wood 1; and a surface decorative layer 3 bonded on a surface of the wood-fiber sheet 2. The cedar laminated wood 1 has a concave/convex part 5 on the surface, which forms the woodgrain pattern. The wood-fiber sheet 2 is made of a wood fiber of a broadleaf tree which has an air-dried specific gravity of 0.7 or more, has a thickness thinner than or equal to a thickness of the cedar laminated wood 1 and has a thickness of 4.0 mm-6.0 mm.

Description

  The present invention relates to a flooring, and more particularly to a lightweight and smooth flooring used for a building such as a house.

  Conventionally, a wood fiberboard such as medium density fiberboard (MDF) is laminated and bonded to the surface of a plywood formed by laminating and bonding a plurality of wood single plates as a flooring of a building. A decorative board in which sheet-like decorative materials are laminated and bonded is used. The adhesion between the plywood and the wood fiber board is usually performed by applying a water-based thermosetting resin adhesive such as a urea resin adhesive or a urea-melamine resin adhesive to the surface of the plywood, and laminating the wood fiber board thereon. It is performed by hot-pressure bonding using a hot press apparatus or the like. Similarly, the adhesive between the wood fiber board and the decorative material is similarly applied by applying a water-based thermosetting resin adhesive on the surface of the wood fiber board and laminating a decorative material such as a veneer and decorative paper on the hot press. This is done by hot-pressure bonding using an apparatus or the like.

  However, in such a flooring material, the moisture content of the adhesive moves to the surface layer of the plywood and the back surface layer of the wooden fiber board and causes their expansion during hot pressing for bonding the plywood and the wood fiber board. The moisture in the surface layer of the wood fiber board evaporates and causes the surface layer to contract. As a result, there has been a problem that deformation such as warping and twisting occurs in the flooring.

  Therefore, in order to suppress deformation such as warping and twisting of the flooring, a laminated board having a structure in which a relatively large specific gravity and thin wood fiberboard is attached to the surface of a plywood having a relatively small specific gravity, for example, It is presented in Patent Document 1. In the laminated board of patent document 1, since the specific gravity and comparatively large wood fiber board are used and the contraction force of a wood fiber board can be made small, it can suppress that a deformation | transformation, such as curvature, arises in a laminated board. . Since deformation such as warpage can be suppressed, the design of the decorative material attached to the surface of the wood fiber board is not impaired.

  On the other hand, a wooden decorative board is presented in Patent Document 2 in which a wood fiber board is pressure-bonded to the surface of a plywood having a concavo-convex grain on the surface, thereby transferring the grain pattern of the plywood to the surface of the wood fiber board. Yes. According to the wooden decorative board described in Patent Literature 2, a wooden decorative board having a design property can be easily obtained with a grain pattern without sticking a decorative material such as a veneer on the surface of the wooden fiber board.

JP 2009-101648 A Japanese Patent No. 4567957

  By the way, in recent years, a plywood using a cedar material as a base material has begun to be used from the viewpoint of promoting utilization of domestic materials. Cedar plywood has long been used as a structural plywood, but it has not been used much in flooring where there are many missing parts and a smooth decorative surface is required. When a plywood made of cedar is used in the configuration described in Patent Document 1 to form a floor with a smooth surface, the floor material immediately after manufacture is smooth and light and does not show deformation. Can be provided. However, by repeatedly receiving high humidity conditions and drying conditions, when the size of the plywood made of cedar is changed, it is disclosed in Patent Document 2 despite the purpose of forming a floor material with a smooth surface. As in the case of the wooden decorative board described, the wood fiber board is pressed from the back side by the uneven grain of the plywood, thereby causing a problem that the uneven pattern of the plywood appears on the surface of the flooring. It has been found that this problem occurs particularly noticeably in cedar plywood using cedar wood. In other words, the difference in hardness and dimensional change between the spring wood part and the autumn wood part of the surface veneer is particularly remarkable in the cedar plywood, and in addition to the concavity peculiar to conifers existing in any layer of the plywood. There arises a problem that the smoothness of the surface of the flooring material is impaired and the design of the decorative material on the surface of the flooring material is impaired.

  In view of the above problems, the object of the present invention is to prevent the appearance of a grain pattern of cedar plywood on the surface even after repeated drying and wetting, and is lightweight and smooth using plywood made of cedar. An object of the present invention is to obtain a flooring that can maintain high designability for a long time.

  In order to achieve the above object, the present invention uses a wood fiber board made of relatively thick and hard broad-leaved wood fiber as a wood fiber board laminated on a cedar plywood, so that it is difficult to deform.

  Specifically, the flooring according to the present invention comprises a cedar plywood formed by laminating and bonding a plurality of single plates made of cedar, a wood fiber board adhered to the surface of the cedar plywood, and the wood fiber Including a surface decorative layer adhered to the surface of the board, and having a thickness of 9.0 mm or more, the cedar plywood has an uneven portion forming a wood grain pattern on its surface, and the wood fiber board is air-dried. It consists of hardwood wood fibers having a specific gravity of 0.7 or more, a thickness less than that of cedar plywood, and 4.0 mm to 6.0 mm.

  According to the flooring according to the present invention, the wood fiber board constituting the flooring is made of hardwood wood fiber having good stability against changes in dimensions due to moisture, and since the specific gravity is relatively high and thick, When the dimensions of the cedar plywood change due to repetition, even if the back surface of the wood fiber board is pressed from the uneven part of the cedar plywood, the wood fiber board becomes difficult to deform, and the uneven part of the grain of the cedar plywood Appearing on the surface of the flooring can be prevented. Thereby, the smoothness and the flooring which can maintain high designability over a long time can be obtained.

  In the flooring according to the present invention, any of the plurality of single plates may have a knot. In such a case, if the cedar plywood dimensions change due to repeated drying and wetting, the difference in hardness between the part having the missing joint and its surroundings and the force applied to the wood fiber board due to the dimensional change rate of the cedar plywood will also differ. Therefore, the pattern of missing nodes appears on the surface of the flooring material. However, as described above, the wood fiber board is not easily deformed, so that the pattern of missing nodes does not appear on the surface of the flooring material.

  According to the flooring according to the present invention, it is possible to prevent the wood grain pattern of plywood from appearing on the surface even when subjected to repeated drying and wetting, so that the flooring is lightweight and has high smoothness and can maintain high designability for a long time. Can be obtained.

It is sectional drawing which shows the flooring which concerns on one Embodiment of this invention.

  A flooring according to an embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, a flooring 10 according to this embodiment includes a cedar plywood 1 in which a plurality of cedar veneers 1 a to 1 e made of cedar are laminated and bonded, and a woody material attached to the surface of the cedar plywood 1. It is comprised by the fiber board 2 and the surface decoration layer 3 stuck on the surface of the wood fiber board 2, and thickness is 9.0 mm or more.

  The cedar plywood 1 is formed by laminating and bonding a plurality of rotary sliced all-layer cedar single plates. Although FIG. 1 shows a five-ply cedar plywood 1 in which five cedar single plates 1a to 1e are stacked, the present invention is not limited to this, and for example, three or four cedar single plates may be stacked. Moreover, the cedar plywood 1 has the uneven | corrugated | grooved part 5 which forms a grain pattern on the surface. In FIG. 1, the concavo-convex portion 5 is illustrated only on the uppermost cedar single plate 1 e for convenience, but each cedar single plate 1 a to 1 e may have the concavo-convex portion 5.

  Moreover, any of the cedar veneers 1a to 1e may have a knot. If there is a gap, there is a difference in hardness between the portion having the gap and the surrounding area. Therefore, the pattern of the gap is formed on the surface of the cedar plywood 1 due to a change in the dimensions of the cedar plywood due to repeated drying and wetting. appear.

  The thickness of the cedar plywood 1 formed by a plurality of cedar plywoods is not particularly limited, but from the viewpoint of strength characteristics after formation of the cedar plywood 1 and stability against changes in dimensions, a cedar plywood of 4.0 mm or more is used. It is preferable to use a plywood, particularly about 5.0 mm to 12.0 mm. In any case, it is important that the thickness of the cedar plywood 1 is equal to or greater than the thickness of the wood fiber board 2. As will be described later, a wood fiber board made of broad-leaved wood fiber having a high strength is used as the wood fiber board 2, and therefore the wood fiber board 2 when the thickness of the cedar plywood 1 becomes smaller than the thickness of the wood fiber board 2. Since the influence of the dimensional change increases, the amount of dimensional change due to repeated warping and wet and dry becomes large, which is not preferable.

  When using a cedar plywood having a thickness of less than 4.0 mm, a plurality of thin cedar thin single plates different from the thickness of a single plate used for a general plywood are laminated with different directions. As a result, a cedar plywood is formed. In this case, since the dimensional change of each cedar thin veneer is small, there is no problem that the grain of cedar plywood appears on the surface. However, in this case, general-purpose plywood cannot be used, resulting in an expensive flooring.

  The wood fiber board 2 is made of hardwood having an air-dry specific gravity of 0.7 or more and a thickness of 4.0 mm to 6.0 mm. When the air-dry specific gravity is less than 0.7, the hardness is low, and therefore when the cedar plywood 1 changes in dimensions, the back surface of the wood fiber board 2 is pressed against the concavo-convex portion 5 of the cedar plywood 1. As a result, an uneven wood grain pattern appears on the surface. At this time, if any one of the cedar veneers 1a to 1e has a knot, a pattern of a knot appears on the surface of the cedar plywood 1 as described above. A pattern of missing nodes appears on the surface of the plate 2. Further, if the thickness is less than 4.0, the rigidity becomes low, and when pressed by the concavo-convex portion 5 of the cedar plywood 1, the concavo-convex wood pattern and the knot pattern appear on the surface. . On the other hand, if the thickness is larger than 6.0 mm, it will occupy 50% or more of the thickness of the most widely used flooring of 9.0 mm to 12.0 mm. In this case, as described above, the thickness of the cedar plywood 1 is smaller than the thickness of the wood fiber board 2, the influence of the dimensional change of the wood fiber board 2 is increased, and the amount of dimensional change due to repeated warping and wet and dry is large. Therefore, it is not preferable. Furthermore, since the weight reduction which is the original purpose of using cedar plywood as a base material cannot be achieved, it is not preferable. For the hard wood fiberboard 2 having a wood air-dry specific gravity of 0.7 or more and a thickness of 4.0 mm to 6.0 mm, for example, a medium density fiber board (MDF) defined by JIS A5905 of wood fiberboard should be used. Is preferred. When an insulation board is selected as the wood fiber board 2, there is a problem in strength to use it as a flooring material. In addition, the hard board is not suitable for use in the wood fiber board 2 because the dimensional change due to water and moisture is large.

  MDFs are broadly divided into broad-leaved tree MDFs that use hardwood wood fibers as raw materials and softwood MDFs that use softwood wood fibers as raw materials. In the present embodiment, a hardwood MDF having good stability against changes in dimensions due to high humidity or moisture is used. As the hardwood MDF, for example, trade name Techwood (registered trademark) manufactured by Daiken Kogyo Co., Ltd. can be used.

  For bonding the cedar plywood 1 and the wood fiber board 2, for example, a hot press method, a cold press method, a roll press method, or the like is used.

  When using the hot pressing method, as the adhesive, for example, melamine, urea, phenol, urea melamine, modified vinyl acetate, aqueous vinyl urethane, or the like is preferably used. In the case of using the cold pressure method, for example, a modified vinyl acetate-based or aqueous vinyl urethane-based adhesive is preferably used. In the roll press method, for example, a hot melt adhesive or a PUR (poly urethane reactive) hot melt adhesive is preferably used.

  For the surface decorative layer 3, for example, a natural wood veneer having a thickness of about 0.05 mm to 1.0 mm, a WPC (wood plastic combination) veneer, a resin decorative sheet, decorative paper, or decorative resin impregnated paper is used. Preferably, a natural wood veneer of about 0.2 mm to 1.0 mm, a decorative resin impregnated paper of about 0.05 mm to 0.2 mm, a resin decorative sheet of about 0.1 mm to 0.6 mm, and the like are used.

  According to the flooring 1 which concerns on one Embodiment of this invention, air-dry specific gravity is 0.7 or more as a wood fiber board 2, thickness is below the thickness of the said cedar plywood, and is 4.0 mm-6.0 mm. MDF made of some hardwood wood fiber is used. For this reason, even if a change in the size of the cedar plywood 1 occurs due to repeated drying and wetting, the wood fiber board 2 has good stability against the change in the size, and the grain of the cedar plywood 1 appears on the surface. It becomes possible to prevent. Moreover, when not only the grain of the cedar plywood 1 but also the cedar plywood 1 has a knot or the like, it is possible to prevent the pattern of the knot from appearing on the surface due to a change in the dimensions of the cedar plywood 1. Thereby, the flooring which is lightweight and has high smoothness and can maintain high designability for a long time can be obtained.

  Hereinafter, specific examples of the flooring having a total thickness of 12.0 mm according to the present invention will be shown, and differences in flooring according to each example are shown in [Table 1]. In [Table 1], as a result of the wet and dry repeated test in each example, ○ is given to the case where the grain pattern of the cedar plywood does not appear on the surface of the flooring, and X is given to the case where the grain pattern of the cedar plywood appears. ing. In addition, as a result of the warpage measurement, ◎ is given for those that were particularly good, ○ for those that were good, and × for those that had great warpage. Regarding the weight, compared with a general 12.0 mm color floor, ◎ is marked for those that are particularly light weighted, and ○ is marked for those that are lightened, so it is not much different or heavy. Things are marked with an x. These were integrated and the comprehensive evaluation as a flooring was performed.

  In addition, although the present Example evaluated especially the floor material of 12.0 mm with a large demand, it cannot be overemphasized that it is not limited to a floor material of 12.0 mm.

Example 1
90 g / m ^{2 of} PUR hot melt adhesive was applied to the surface of a cedar plywood composed of 5 cedar veneers with a thickness of 8.0 mm, and MDF with a thickness of 4.0 mm consisting of hardwood on the surface (large A product name Techwood XM) manufactured by Ken Kogyo Co., Ltd. was laminated. Subsequently, while transporting the laminate at a feed rate of 30 m / min, the surface was pressed by a roll press so that the linear pressure was 20 kg / cm, and the cedar plywood and MDF were laminated and integrated. Thereafter, an olefin resin decorative sheet was stuck and integrated on the surface of the MDF with a water-based vinyl alcohol adhesive to obtain a flooring having a total thickness of 12.0 mm. The flooring immediately after manufacture was lightweight, free from warpage, and smooth in surface.

  This flooring was subjected to a dry and wet repeated test in which a temperature of 40 ° C. and humidity of 90% and a temperature of 40 ° C. and humidity of 40% were repeated two cycles. As a result, the grain pattern of cedar plywood did not appear on the surface of the flooring. Moreover, although the curvature was confirmed, the curvature which becomes a problem in particular was not confirmed.

(Example 2)
90 g / m ^{2 of} PUR hot melt adhesive was applied to the surface of a cedar plywood made up of three cedar veneers with a thickness of 6.5 mm, and a MDF with a thickness of 5.5 mm made of hardwood on the surface (large A product name Techwood XM) manufactured by Ken Kogyo Co., Ltd. was laminated. Subsequently, while transporting the laminate at a feed rate of 30 m / min, the surface was pressed by a roll press so that the linear pressure was 20 kg / cm, and the cedar plywood and MDF were laminated and integrated. Thereafter, an olefin resin decorative sheet was stuck and integrated on the surface of the MDF with a water-based vinyl alcohol adhesive to obtain a flooring having a total thickness of 12.0 mm. The flooring immediately after production was slightly light and free from warping and had a smooth surface.

  This flooring was subjected to a dry and wet repeated test in which a temperature of 40 ° C. and humidity of 90% and a temperature of 40 ° C. and humidity of 40% were repeated two cycles. As a result, the grain pattern of cedar plywood did not appear on the surface of the flooring. Moreover, although the curvature was confirmed, the curvature which becomes a problem in particular was not confirmed.

(Comparative Example 1)
90 g / m ^{2 of} PUR hot melt adhesive was applied to the surface of a cedar plywood with a thickness of 9.0 mm consisting of 5 cedar veneers, and a MDF with a thickness of 2.7 mm made of hardwood on this surface (large A product name Techwood XM) manufactured by Ken Kogyo Co., Ltd. was laminated. Subsequently, while transporting the laminate at a feed rate of 30 m / min, the surface was pressed by a roll press so that the linear pressure was 20 kg / cm, and the cedar plywood and MDF were laminated and integrated. After that, an olefin resin decorative sheet was stuck and integrated on the surface of the MDF with a water-based vinyl alcohol adhesive to obtain a flooring. The flooring immediately after manufacture was lightweight, free from warpage, and smooth in surface.

  This flooring was subjected to a dry and wet repeated test in which a temperature of 40 ° C. and humidity of 90% and a temperature of 40 ° C. and humidity of 40% were repeated two cycles. As a result, a wood grain pattern of cedar plywood appeared on the surface of the flooring. Moreover, although the curvature was confirmed, there was no problem in particular.

(Comparative Example 2)
In this comparative example, MDF (trade name custom wood manufactured by Daiken Kogyo Co., Ltd.) having a thickness of 4.0 mm made of coniferous trees was used instead of the hardwood MDF having a thickness of 4.0 mm made of broadleaf trees in Example 1. The flooring was obtained under the same conditions as in Example 1. The flooring immediately after manufacture was lightweight, free from warpage, and smooth in surface.

  This flooring was subjected to a dry and wet repeated test in which a temperature of 40 ° C. and humidity of 90% and a temperature of 40 ° C. and humidity of 40% were repeated two cycles. As a result, a wood grain pattern of cedar plywood appeared on the surface of the flooring. Further, when the warpage was confirmed, it was found that the concave warpage and the convex warpage were largely repeated by repeated drying and wetting.

(Comparative Example 3)
90 g / m ^{2 of} PUR hot melt adhesive was applied to the surface of a cedar plywood consisting of 5 cedar veneers and a thickness of 4.5 mm. A product name Techwood XM) manufactured by Ken Kogyo Co., Ltd. was laminated. Subsequently, while transporting the laminate at a feed rate of 30 m / min, the surface was pressed by a roll press so that the linear pressure was 20 kg / cm, and the cedar plywood and MDF were laminated and integrated. Thereafter, an olefin resin decorative sheet was stuck and integrated on the surface of the MDF with a water-based vinyl alcohol adhesive to obtain a flooring having a total thickness of 12.0 mm. The floor material thus obtained has a weight equal to or higher than that of the conventional floor material, and the purpose of reducing the weight by using cedar plywood cannot be achieved.

  According to [Table 1], it was shown that, by using hardwood MDF having a thickness of 4.0 mm or more for the flooring material, a cedar plywood grain pattern does not appear on the surface even when subjected to repeated drying and wetting. It has also been found that weight reduction can be achieved by using MDF having a predetermined thickness.

  The flooring according to the present invention can prevent a plywood grain pattern from appearing on the surface even when subjected to repeated drying and wetting, in particular, a lightweight and highly smooth flooring used as an interior material of a building such as a house. Useful for.

DESCRIPTION OF SYMBOLS 1 Cedar plywood 1a-1e Cedar veneer 2 Wood fiber board 3 Surface decorative layer 5 Uneven part 10 Flooring

Claims (2)

A cedar plywood formed by laminating and bonding a plurality of single plates made of cedar wood, a wood fiber board stuck to the surface of the cedar plywood, and a surface decorative layer stuck to the surface of the wood fiber board; A flooring having a thickness of 9.0 mm or more,
The cedar plywood has a concavo-convex part that forms a wood grain pattern on its surface,
The wood fiber board is made of hardwood wood fiber having an air-dry specific gravity of 0.7 or more, a thickness less than that of the cedar plywood, and 4.0 mm to 6.0 mm. .   The flooring material according to claim 1, wherein any one of the plurality of single plates has a missing node.

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