JP4134050B2 - Wood composite board building material - Google Patents

Description

  Of the building materials used for building decks, terraces, fences, handrails, pillars, benches, etc., the present invention is particularly formed from a mixed material of wood powder such as building waste and thermoplastic resin as a raw material. This is related to the improvement of wood composite board building materials.

  Wood has generally been used as a building material in the past, but recently, a wood composite board building material for building formed by mixing wood powder such as building waste and thermoplastic resin is known. It is used for various building materials such as decks, fences, interior panels, exterior wall decorative materials, and various furniture materials. (For example, see Patent Document 1)

JP 2002-187116 A JP-A-9-216500

  The wood composite board building materials described in the above-mentioned patent documents 1 and 2 can be used to form a wood composite board with a wood texture that reproduces the grain pattern and color tone close to natural wood. As the manufacturing process, the synthetic material of wood and thermoplastic synthetic resin is extruded while the surface is flat, and then the surface of this molded product is ground by sanding. A rough surface on which a woody surface can be formed, and then a wood grain pattern is printed in the next process, followed by a step of overcoating with a paint, and the point is to express the wood grain pattern by printing Thus, the manufacturing process is complicated and expensive, and there is a problem that it is not suitable as an exterior material such as a deck material which is the object of the present invention.

  The present invention eliminates the problems of conventional wood composite board building materials of this type, so that the surface of the synthetic board building material is not treated with a wood grain pattern or coated with a clear woody surface. An object of the present invention is to provide a wood composite board building material capable of efficiently producing a wood composite board having a texture of wood formed with lines.

The present invention, as a specific means for that, is a wood synthetic board building material comprising a substrate obtained by extrusion molding a mixture of thermoplastic synthetic resin and wood powder, the cross section of the substrate has a plurality of hollow portions, It is arranged so as to penetrate in parallel along the length direction of the substrate at intervals, and the surface of the substrate has no height, depth and width intervals along the length direction of the substrate. A large number of regular ridges are provided, and the top of each ridge is cut on the surface of the formed substrate by adjusting the pressing force against the surface of the ridges with a grinding device. In contrast, the mixed tone of the color of wood powder and the color of the raw resin on the cut surface of the top and the color tone of the raw resin layer in the concave valley exposed by adjusting the cutting strength. It is characterized by being.
In addition, by cutting the top and both shoulders of the ridges while adjusting the pressing force against the surface of the ridges on the surface of the formed substrate with a grinding device, The color tone mixed with the color of the wood powder and the color of the raw resin, the color tone of the resin layer where the wood powder cannot be seen or seen due to insufficient cutting amount, and the wood powder exposure because the cutting force does not reach Alternatively, the color tone of the resin layer in which no color is observed may be shown in contrast.

  When extruding a mixture of thermoplastic synthetic resin and wood powder, uneven surfaces may be formed on the surface of the substrate due to sink marks during the molding process. In order to suppress this, the heights of the ridges and ridges are provided higher in areas where depressions due to sink marks occur, and the heights of ridges and ridges are lowered in areas where swelling occurs. It is preferable that the surface of the substrate is made a uniform flat surface with a wood texture by cutting the tops of the ridges with a grinding device.

  The plurality of through-holes provided in the cross section of the substrate include a vertically long I-shaped hole arranged so as to penetrate in parallel along the length direction of the substrate and a pair of adjacent I-shaped holes. It is preferable that it is comprised from the combination with the H-shaped hole which connected the intermediate part of this horizontally by the horizontal hole.

  In addition, the substrate has a shape in which concave grooves for engaging with joists etc. are provided on both side surfaces along the length direction, and both side surfaces along the length direction of the substrate. It is preferable to prepare a flat surface having no concave grooves.

  The wood composite board building material according to the present invention is not a relatively thin wood composite board that prints a wood grain pattern on a conventionally known surface, but is an exterior material such as a deck material, and has a high strength. A wood synthetic board with a large required thickness is molded from a mixed material of wood powder and thermoplastic synthetic resin. The molded substrate has a plurality of hollow sections in a cross section along the length direction. Because it is provided so that the part is arranged, even a thick synthetic wood board can be efficiently extruded at a relatively high molding speed, and a strong and lightweight substrate can be formed Can do.

  In addition, this wood composite board building material is formed with a substrate having a large number of irregular ridges with irregular height, depth and width intervals on the surface of the substrate when a mixture of wood powder and thermoplastic synthetic resin is extruded. Since the surface of the ridges is cut by a grinding device after molding, along with the irregular arrangement of each ridge, the color of the wood powder on the cut surface of the top of the ridges In contrast to the color tone mixed with the color of the raw material resin and the color tone of the rich raw material resin layer with adjusted strength of cutting in the concave and valley valleys, can do.

  In the wood composite board building material of the present invention, in molding, in order to reduce the weight of the substrate as much as possible and to perform the molding efficiently, a plurality of pieces are provided in a cross section along the length direction of the substrate. However, as the width of the substrate increases, the hollow portion is made of only a vertically long I-shaped hole so that the substrate can be made as light as possible and can be molded efficiently. Instead, an H-shaped hole in which these I-shaped holes are connected by a horizontal hole is provided to reduce the weight. Therefore, in the portion where the H-shaped hole is provided, the horizontal width interval that becomes hollow becomes larger than that of the I-shaped hole portion, the amount of resin flowing out increases, and sinking is likely to occur. On the contrary, bulging occurs in the portion where there are many.

  For such a problem, in the woody synthetic board building material of the present invention, in order to suppress the occurrence of the uneven surface, in the portion where the concave portion due to sink marks is generated, the height of the convex stripes and the concave stripes is set higher. In addition, since the ridges and the concave ridges are provided at lower heights at the portions where the bulges occur, and the tops of the ridges are cut by a grinding device, the surface of the substrate is made to be a uniform flat surface with a wood texture. can do.

When forming the wood composite board building material of the present invention, a plurality of hollow portions provided in the cross section of the substrate are arranged in a vertically long I shape arranged so as to penetrate in parallel along the length direction of the substrate at intervals. It is preferable to configure a combination of a hole and an H-shaped hole in which intermediate portions of a pair of adjacent I-shaped holes are horizontally connected by a horizontal hole. In addition, a large number of irregularities having irregular height, depth, and width intervals are provided on the surface of the substrate along the length direction of the substrate, and then the surface of the irregularities is pressed by a grinding device. By adjusting the pressure, cutting the top of the ridge, and adjusting the color tone mixed with the color of the wood powder and the color of the raw material resin on the cut surface of each ridge top, and adjusting the cutting strength It is preferable that the color tone of the material resin layer of the concave valley portion to be exposed is expressed in contrast.

  Next, the construction of the wood composite board building material according to the present invention will be described with respect to an example in which the deck material is implemented. As shown in FIG. 1, this deck material is a thermoplastic synthetic resin such as polyethylene, polypropylene, polyester, etc. 2 and wood powder 3 having a size of 200 to 300 μm obtained by pulverizing building waste material, is made of a substrate 1 extruded by a raw material resin mixed at a ratio of 5: 5. In addition, a plurality of hollow portions 4 are arranged so as to penetrate in parallel along the length direction of the substrate 1 at intervals, and the surface of the substrate 1 is shown in FIGS. 1 and 3. As described above, along the length direction of the substrate 1, a large number of concave stripes 5 and convex stripes 6 are provided in which the height t, the depth d, and the width interval w are irregular.

  The plurality of through-holes 4 provided in the cross section of the substrate 1 are formed of a vertically long I-shaped hole 7 arranged so as to penetrate in parallel along the length direction of the substrate 1 and a pair of adjacent ones. It is preferable that the I-shaped holes 7 and 7 are arranged in combination with the H-shaped holes 8 in which the intermediate portions of the I-shaped holes 7 and 7 are connected horizontally by the horizontal holes 9.

  This H-shaped hole 8 has the advantage that an appropriate weight reduction can be achieved without reducing the strength of the substrate 1 and the molding can be performed efficiently. It is preferable that they are arranged.

  When the hollow portion 4 provided in the cross section of the substrate 1 is an I-shaped hole 7 and an H-shaped hole 8, the substrate 1 is fixed to the lower joist 16 or the like as shown in FIG. When inserting the mounting screw 12 from the front surface to the rear surface direction so that the screw 12 passes through the I-shaped hole 7, the screw 12 can be easily inserted into the plate surface, and the I-shaped As compared with the case where screws are inserted into a space wider than the hole, the substrate can be effectively tightened without impairing the strength of the substrate. Such an advantage can be obtained not only in the case of the I-shaped hole but also in the case of the H-shaped hole 8 because the screw 12 may be inserted into any one of the I-shaped holes forming the H-shaped hole 8. .

  Further, as shown in FIG. 1, on both side surfaces 1 a of the substrate 1, when the substrate 1 is fixed to a joist member or the like on the lower surface (not shown) with the fixing bracket 10, A concave groove 11 is provided along the length direction of the substrate 1. In this embodiment of the deck material, the concave groove 11 is constituted by a single I-shaped hole 7 and a lateral hole 9 provided between the side surface 1a of the substrate.

  On the other hand, the substrate 1 is used on a side surface or one surface along the length direction of the substrate 1 for use other than the deck material, for example, a column member as shown in FIG. It is good also as the flat surface 13 which has many concave 5 and the convex 6 provided in the surface of the board | substrate 1, without providing the concave 11.

  As shown in FIG. 2, when the raw material resin of the resin 2 and the wood powder 3 flows under the extrusion force in the mold 17, the resin 2 forming the molded product is resistant to the mixed wood powder 3. While flowing, the wood powder 3 flows in a state where it is dispersed in the resin 2. However, the resin 2 easily flows on the surface portion in contact with the inner surface of the mold 17, and is thus molded. The surface portion of the substrate 1 is formed with a resin layer 2a having a small amount of the wood powder 3 and a rich amount of the resin 2 as compared with the inside of the molded product containing a large amount of the wood powder 3. The

  Further, when extruding the mixed material of the resin 2 and the wood powder 3 from the mold 17, as shown in FIG. 3, the height t and the depth along the length direction of the substrate 1 on both the front and back surfaces of the substrate 1. Extrusion is performed so that a large number of concave stripes 5 and convex stripes 6 having irregular intervals of width d and width w are formed.

  On the other hand, as described above, in this deck material, a hollow portion 4 such as a vertically long I-shaped hole 7 or an H-shaped hole 8 is provided in the cross section of the substrate 1 so that molding can be performed efficiently. However, as shown in FIG. 4, the hollow portion such as the H-shaped hole 8 has a larger horizontal width C compared to the portion of the I-shaped hole 7. Since the recesses 14 due to sink marks are likely to be generated due to the increase in the height, convex portions 15 that swell on the contrary are generated in the portions where the number of the I-shaped holes 7 is large.

  As described above, when the hollow portion 4 such as the I-shaped hole 7 or the H-shaped hole 8 is provided in the cross section of the substrate 1, the concave portion 14 and the convex portion 15 are caused on the surface of the substrate 1 due to sink marks or the like in the molding process. In order to suppress the occurrence of such uneven portions, the height t of the ridges 6 and the ridges 5 is previously provided in the portions where the recesses 14 due to sink marks are generated, and the bulges are formed. In the portion where the ridges are generated, the molding by the mold can be adjusted so that the height t of the ridges 6 and the ridges 5 is lowered.

  After the molded substrate 1 is sufficiently cooled and hardened, the top of the ridge 6 and both shoulders thereof are scraped while adjusting the pressing force on the surface of the substrate 1 by a grinding device such as a wire brush. To cut. As a result, as shown in FIG. 5, the top of the ridge 6 has a color tone of the raw material resin layer 2c where a large amount of the wood powder 3 is exposed, and both shoulders of the ridge top, that is, the ridge 6 and the ridge 5 In the middle inclined portion 6a, since the shaving amount is not sufficient, the color tone of the resin layer 2b so that the wood powder 3 cannot be seen or seen, and further, in the trough portion of the recess 5, the cutting force does not reach, The color tone of the resin layer 2a having a concentration at which the wood powder 3 is not exposed is shown in contrast, and the surface of the substrate 1 is made a uniform flat surface with a wood texture.

  Among the above-mentioned different color tones, the top of the ridge 6 becomes a resin layer 2c having a low reflectance of light from which the wood powder 3 is exposed by scraping off the resin, and the slope between the ridge 6 and the recess 5 In the portion 6a, the light reflectivity is larger than that of the resin layer 2c, and the resin layer 2b also has a resin color tone. In the valley portion of the groove 5, the resin layer having a rich resin amount as shown in FIG. Since 2a is left as it is, it is possible to form the resin layer 2a having a high light reflectance and a rich color.

  By providing the hollow portion 4 in the cross section of the substrate 1, a concave portion 14 or a convex portion 15 due to sink marks or the like may be formed on the surface of the substrate 1. Therefore, in a portion where the concave portion 14 due to such sink marks is generated, The height t of the ridges 6 and the recesses 5 is previously set high, and the height t of the ridges 6 and the recesses 5 is lowered at the portions where the bulges are generated. If the generation is suppressed, the surface of the substrate 1 is adjusted by the grinding device later, and the top and the shoulders of the ridge 6 are cut so that the top and the shoulders thereof are cut off. A synthetic board building material can be obtained.

  In the wood composite board building material of the present invention, it is not necessary to print a wood grain pattern on the molded substrate or to perform a top coating process with a paint in a later process, so that it is far more than a conventional deck structure of this type. Economical and highly available.

The perspective view which shows the structure which implemented the wooden synthetic board building material of this invention to the deck material. The partial expanded sectional view which shows the cross-sectional shape immediately after shaping | molding of this wood synthetic board building material. The partial expanded sectional view which shows the structure of this woody synthetic board building material. The partial expanded sectional view explaining phenomena, such as a sink mark which generate | occur | produces after shaping | molding. The partial expanded sectional view after grinding the surface of a board | substrate. Sectional drawing of the state which inserts a screw in a board | substrate hollow part as a fixing means of a board | substrate. The perspective view which shows the shape of the board | substrate which does not have a ditch | groove on a side surface.

Explanation of symbols

1: substrate
2: Thermoplastic synthetic resin,
2a, 2b, 2c: resin layer,
3: Wood flour,
4: Hollow part,
5: Recess,
6: ridges,
6a: inclined part,
7: I-shaped hole,
8: H-shaped hole,
9: Horizontal hole,
10: Fixing bracket,
11: Groove,
12: Screw,
13: flat surface,
14: recess,
15: convex part,
16: joists
17: Mold

Claims (6)

It is a wooden synthetic board building material consisting of a substrate obtained by extruding a mixture of thermoplastic synthetic resin and wood powder. In the cross section of the substrate, a plurality of hollow parts are spaced in the length direction of the substrate. The substrate surface is provided with a large number of irregularities with irregular height, depth, and width intervals along the length direction of the substrate. And
By cutting the top of the ridges on the surface of the formed substrate while adjusting the pressing force against the surface of the ridges by a grinding device, the color and raw material of the wood powder on the cut surface of each ridge top A wood composite board building material characterized in that a color tone mixed with a resin color is contrasted with a color tone of a raw material resin layer in a concave valley exposed by adjusting the strength of cutting . It is a wooden synthetic board building material consisting of a substrate obtained by extruding a mixture of thermoplastic synthetic resin and wood powder. In the cross section of the substrate, a plurality of hollow parts are spaced in the length direction of the substrate. The substrate surface is provided with a large number of irregularities with irregular height, depth, and width intervals along the length direction of the substrate. And
  By cutting the top and both shoulders of the ridges while adjusting the pressing force against the surface of the ridges by a grinding device on the surface of the molded substrate, the wood powder on the cut surface of each ridge top The color tone mixed with the color of the raw material resin, the color tone of the resin layer where the wood powder cannot be seen or seen due to insufficient cutting amount, and the cutting force does not reach, so the wood powder is exposed. A wood-based synthetic board building material characterized by contrasting the color tone of the resin layer that cannot be obtained. In order to suppress the uneven surface generated on the surface of the substrate during the molding process, the height of the ridges and the ridges are provided higher in the concave portions due to sink marks, and the portions where the bulges occur are provided. , provided the height position of the ridge and concave to low, by cutting the respective grinding device the tops of the ridges, claim 1 or claim 2 and a uniform plane with the surface of the substrate of woody feeling A wood composite board building material described in 1 . A vertically long I-shaped hole in which a plurality of through-holes provided in the cross section of the substrate are arranged in parallel along the length direction of the substrate at intervals, and a pair of adjacent I-shaped holes The woody synthetic board building material in any one of Claims 1-3 comprised from the combination with the H-shaped hole which connected the intermediate part of this horizontally with the horizontal hole. The woody material according to any one of claims 1 to 4, wherein a concave groove for engaging the substrate with a joist or the like via a fixing bracket is provided on both side surfaces of the substrate along the length direction of the substrate. Synthetic board building material. The woody composite board building material according to any one of claims 1 to 4, wherein both side surfaces along the length direction of the substrate are flat surfaces having no concave grooves.

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