Long member, louver, and method for manufacturing long member

Abstract

To provide a long-length member having a twisted part even though having feeling and tactile impression close to a woody material.SOLUTION: A long-length member 10 is made of an integrally extrusion molded body 20 and includes a twisted part 11. The integrally extrusion molded body includes a tubular aluminum core material, an adhesive layer formed on a surface of the core material, and a coating layer that is formed on the adhesive layer and contains a thermoplastic resin and a wood flour. The twisted part has such a shape that the integrally extrusion molded body is rotated around an axis in a longitudinal direction thereof.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a twisted product of an integrally extruded long member used as a building material or the like, which has an appearance similar to that of wood. [Background technology]

[0002] Extrusion molded articles made of thermoplastic resins that resemble wood materials are used as building materials, decorative materials, etc. For example, Patent Document 1 describes an integrally extruded article that has a coating layer containing polyolefin resin and wood powder on the outer surface of an aluminum core material, giving it a high-quality wood texture. Patent Document 2 describes a bent product with excellent design that uses the above-mentioned integrally extruded article. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-066403 [Patent Document 2] International Publication No. WO2016 / 006707 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been an increasing demand for components that have a high-quality wood texture and shapes that are difficult to achieve with wood materials, in addition to the bent products described in Patent Document 2. The present invention was made in response to such demands, and aims to provide a long component that has a twisted portion while having a texture and feel similar to that of wood materials. [Means for solving the problem]

[0005] The long member of the present invention is a long member made of an integrally extruded body and having a twisted portion, the integrally extruded body having a tubular aluminum core material, an adhesive layer formed on the surface of the core material, and a coating layer formed on the surface of the adhesive layer and containing a thermoplastic resin and wood flour, the twisted portion having a shape obtained by rotating the integrally extruded body around its longitudinal axis. Here, aluminum includes aluminum alloys.

[0006] The louver of the present invention is a louver that uses the above-mentioned long members, and is constructed by mixing the long members having different rotation speeds around the axis of the twisted portion, or by mixing the long members with the integrally extruded molded body that does not have a twisted portion.

[0007] The method for manufacturing a long member of the present invention is a method for manufacturing a long member made of an integrally extruded body and having a twisted portion, wherein the integrally extruded body has a tubular aluminum core material, an adhesive layer formed on the surface of the core material, and a coating layer formed on the surface of the adhesive layer and containing a thermoplastic resin and wood powder, and at least two points in the longitudinal direction of the integrally extruded body are held by a first holding mechanism and a second holding mechanism that are movable relative to each other in the longitudinal direction, and the first holding mechanism and the second holding mechanism are rotated relatively around the longitudinal axis of the integrally extruded body to form a twisted portion in the integrally extruded body. [Effects of the Invention]

[0008] According to the present invention, a long member can be obtained that has a high-quality wood texture and also has a twisted portion that is difficult to produce using wood material. [Brief explanation of the drawings]

[0009] [Figure 1] 1A and 1B are diagrams showing the appearance of an elongated member according to an embodiment, in which A is a front view and B is a side view. [Figure 2] 2A and 2B are diagrams showing the cross-sectional structure of an elongated member according to one embodiment, in which A is an SS end view of FIG. 1A and B is an enlarged view of the XY portion of FIG. [Figure 3]1 is a diagram illustrating the arrangement of partition walls of a core material, where A: there are no intersections between the partition walls in the cross section, B: there are intersections, and C: there are no intersections. [Figure 4] FIG. 2 is a diagram showing the appearance of a louver according to an embodiment. [Figure 5] FIG. 2 is a diagram showing the structure of an integrated extrusion molding machine. [Figure 6] FIG. 10 is a diagram for explaining a twisting method. [Figure 7] FIG. 2 is a diagram showing the appearance of a long member according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] In this specification, "integral extrusion molding" refers to the process of extruding a coating layer material and simultaneously coating and integrating the layer onto a core material that has been fed in, and an object formed by this method is referred to as an "integral extrusion molded body." Furthermore, when simply referring to a "long member," this refers to a long member that is one embodiment of the present invention. Furthermore, when simply referring to a "cross section" of a long member or an integral extrusion molded body, this refers to a cross section perpendicular to the longitudinal direction.

[0011] 1, the elongated member 10 of this embodiment is made of a wood-like integral extrusion molded body 20, and has a twisted portion 11 formed by rotating the integral extrusion molded body 20 around its longitudinal axis C. The longitudinal axis C of the integral extrusion molded body 20 coincides with the longitudinal axis of the elongated member 10. Details of the shape of the elongated member 10, such as the number of rotations of the integral extrusion molded body at the twisted portion 11, will be described later.

[0012] Referring to Fig. 2, the integrally extruded body 20 has a quadrangular prism shape with a rectangular cross section. The cross-sectional shape of the integrally extruded body is not particularly limited as long as it is a shape that allows integral extrusion molding and whose appearance changes when twisted. The cross-sectional shape of the integrally extruded body is preferably a rectangle including a square, as this provides a significant design effect to the elongated member 10.

[0013] The integrally extruded body 20 has a core material 21, an adhesive layer 26 that covers the entire outer surface of the core material, and a coating layer 27 that covers the entire surface of the adhesive layer.

[0014] The core material 21 is made of aluminum or an aluminum alloy. This is because it combines the strength and light weight required for building components, and it is easy to process bolt fastening holes and screw holes, etc., that are required when installing the long member 10 as a building component. Specifically, a material with good extrusion formability, such as that used for aluminum sashes, such as alloy numbers 6063 and 6060 specified in JISH4100, can be used.

[0015] The core material 21 shown in FIG. 2 has a tubular peripheral wall 22 with a rectangular cross section, and a partition wall 23 that divides the internal space of the peripheral wall in the long side direction of the cross section and extends in the longitudinal direction of the core material. The partition wall 23 functions to prevent deformation of the core material 21 due to resin pressure during the integral extrusion molding to form the coating layer 27. The partition wall 23 of this embodiment also functions to prevent deformation of the center portion of the side of the peripheral wall 22 during twisting. While it is possible to increase the thickness of the peripheral wall 22 to ensure the required strength, providing the partition wall 23 without changing the thickness of the peripheral wall can sometimes result in a lighter core material. If the length of one side of the cross section of the core material 21 is longer than a certain level, it is preferable to provide the partition wall 23.

[0016] The number of partition walls 23 is not limited to one, and may be two or more. For example, in FIG. 3A, two partition walls are provided in the long side direction of the cross section of the core material. If the distance between adjacent partition walls 23 or the distance between adjacent partition walls 23 and the peripheral wall 22 is referred to as the partition wall span P, the partition wall span P is preferably 30 mm or less. This is because if the section without partition walls continues longer than this, the core material is likely to deform during integral extrusion molding or twisting processing. On the other hand, the partition wall span P is preferably 10 mm or more, more preferably 15 mm or more. This is because there is no particular benefit to making the partition wall span P narrower than this, considering the reinforcing effect of the partition walls 23, the weight of the core material, material costs, etc.

[0017] When partition walls 23 are provided vertically and horizontally inside peripheral wall 22, it is preferable that there are no crisscrossing portions (24 in FIG. 3B) of partition walls 23 in the cross section. This is because stress is concentrated during twisting, making it easy for the partition walls to break at cross sections 24. When partition walls 23 are provided vertically and horizontally inside peripheral wall 22, it is preferable that the vertical and horizontal partition walls 23 are connected to each other in a T-shape in the cross section (25 in FIG. 3C).

[0018] The thickness of the peripheral wall 22 is preferably 0.8 mm or more, more preferably 1.0 mm or more, and particularly preferably 1.2 mm or more. If the peripheral wall 22 is too thin, it becomes difficult to manufacture the core material 21 by extrusion molding. On the other hand, the thickness of the peripheral wall 22 is preferably 2.3 mm or less, more preferably 1.9 mm or less, and particularly preferably 1.8 mm or less. If the peripheral wall 22 is too thick, the lightweight nature of the elongated member 10 is impaired.

[0019] The thickness of the partition wall 23 is preferably 0.8 mm or more, more preferably 0.9 mm or more, and particularly preferably 1.0 mm or more. If the partition wall 23 is too thin, it becomes difficult to manufacture the core material 21 by extrusion molding. On the other hand, the thickness of the partition wall 23 is preferably 2.3 mm or less, more preferably 1.9 mm or less, and particularly preferably 1.8 mm or less. If the partition wall 23 is too thick, the lightweight nature of the elongated member 10 is impaired.

[0020] The outer surface of the core material 21 is preferably knurled and / or anodized to improve adhesion between the adhesive layer 26 and the coating layer 27. Knurling is a process for forming grooves on the outer surface of the core material, thereby improving the adhesive strength between the adhesive layer 26 and the coating layer 27 and the core material. For example, knurling forms grooves along the longitudinal direction of the core material. The depth of the knurled grooves is preferably 0.03 to 1.0 mm, and the groove pitch is preferably 0.03 to 1.5 mm. The groove shape can be, for example, a series of approximately triangular or arc-shaped convex and concave portions. Anodizing is a process for forming a metal oxide film on the surface of the core material. Since the anodized film has fine pores extending from the surface in the thickness direction, using it without a pore-sealing process also improves the adhesive strength between the adhesive layer and the coating layer and the core material. When both knurling and anodizing are performed, it is preferable to perform the knurling process first and then the anodizing process.

[0021] The adhesive layer 26 covers the entire outer surface of the core material 21 and is interposed between the core material and the coating layer 27. As will be described later, the coating layer 27 contains wood powder, which makes it prone to defects such as cracks and partial peeling during twisting. The adhesive layer interposed between the core material and the coating layer absorbs internal stress during twisting, preventing such defects from occurring. If the integrally extruded body 20 is used in its straight tubular form, the adhesive layer can be omitted; however, in this embodiment, the integrally extruded body is twisted, so the adhesive layer 26 must be provided.

[0022] The composition of the adhesive layer 26 is not particularly limited as long as it can bond the core material 21 and the covering layer 27, but it preferably contains an epoxy group-containing polyolefin resin, which is a copolymer of an α-olefin and an epoxy group-containing unsaturated monomer. Maleic anhydride-modified polypropylene is also preferred. Examples of the α-olefin include the same monomers as the α-olefins that constitute the polyolefin resin contained in the covering layer. Examples of the epoxy group-containing unsaturated monomer include glycidyl (meth)acrylates such as glycidyl acrylate and glycidyl methacrylate. Of these, glycidyl (meth)acrylate is preferred. Epoxy group-containing polyolefin resins that can be used for the adhesive layer 26 are described in detail in Patent Document 1.

[0023] When the adhesive layer 26 is formed by extrusion molding, from the viewpoints of heat resistance and extrusion moldability, the epoxy group-containing polyolefin resin of the adhesive layer preferably has a melting point of 50 to 105° C., particularly 90 to 100° C. From the viewpoint of integral extrusion molding, the MFR of the epoxy group-containing polyolefin resin is preferably 1 to 20 g / 10 min, and more preferably 3 to 10 g / 10 min.

[0024] The thickness of the adhesive layer 26 is not particularly limited as long as the object of the present invention is achieved, but from the viewpoint of adhesion and productivity, and to prevent the adhesive layer from breaking, peeling, etc. during bending processing, the thickness is preferably 0.05 to 1.0 mm, and more preferably 0.1 to 0.5 mm.

[0025] The coating layer 27 covers the entire surface of the adhesive layer 26 and constitutes the entire outer surface of the integrally extruded body 20, and therefore the entire outer surface of the elongated member 10. The coating layer 27 contains a thermoplastic resin, wood flour, and a colorant.

[0026] As the thermoplastic resin, a polyolefin resin is preferably used. Examples of polyolefin resins include polyethylene, polypropylene, and ethylene-propylene copolymer. The reason for using polyolefin resin is that it has excellent weather resistance when used outdoors. Preferred polyolefin resins are polyethylene and polypropylene, and a particularly preferred polyolefin resin is polypropylene, which has an excellent wood texture after sanding, as described below.

[0027] The polyolefin resin is preferably modified with an unsaturated carboxylic acid, as this improves compatibility with wood flour. Examples of unsaturated carboxylic acids include unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, ethacrylic acid, and crotonic acid, unsaturated dicarboxylic acids such as itaconic acid, maleic acid, and fumaric acid, and derivatives thereof. Preferred unsaturated carboxylic acids are unsaturated dicarboxylic acids and their anhydrides, such as maleic acid and maleic anhydride. The content of unsaturated carboxylic acid in the unsaturated carboxylic acid-modified polyolefin resin is preferably 0.1 to 15% by weight based on the total monomer content of the unsaturated carboxylic acid-modified polyolefin resin.

[0028] Alternatively, an unsaturated carboxylic acid may be contained as a component separate from the polyolefin resin or unsaturated carboxylic acid-modified polyolefin resin. The purpose, like the unsaturated carboxylic acid modification, is to improve the compatibility between the polyolefin resin and wood flour. Preferred unsaturated carboxylic acids are unsaturated dicarboxylic acids and their anhydrides, such as maleic acid and maleic anhydride. The content of the unsaturated carboxylic acid contained as a separate component of the polyolefin resin is preferably 0.2 to 10 parts by weight per 100 parts by weight of the polyolefin resin.

[0029] The polyolefin resin preferably has a melting point of 165°C or less, particularly 125 to 165°C. From the viewpoint of ease of integral extrusion molding, the polyolefin resin preferably has an MFR (melt flow rate) of 3 to 25 g / 10 min, more preferably 3 to 15 g / 10 min. The melting point can be measured by known differential scanning calorimetry. The MFR is the value at 190°C and a load of 2.16 kgf, and can be measured in accordance with JIS K7210.

[0030] The coating layer 27 may contain a resin other than polyolefin. Examples of such a resin include acrylonitrile butadiene styrene resin. When the coating layer contains a resin other than polyolefin, the proportion of polyolefin resin in the total resin is preferably 90% by weight or more. More preferably, the resin component of the coating layer 27 consists solely of polyolefin resin.

[0031] The covering layer 27 contains wood flour to impart an excellent appearance and feel. Wood flour is often made from wood such as cedar, cypress, and western hemlock, as well as crushed scraps and waste wood of such wood, sawdust, etc. The grain size of the wood flour can be 10 to 500 mesh, and a more preferred grain size is about 60 to 100 mesh. Using crushed scraps and waste wood as wood flour is preferable because it reduces the environmental impact.

[0032] The content of wood flour is preferably 5 to 50 parts by weight, more preferably 10 to 40 parts by weight, based on 100 parts by weight of the thermoplastic resin.

[0033] The coating layer 27 contains a colorant to impart a wood-like color, etc. Known inorganic or organic pigments can be used as the colorant. The content of the colorant is preferably 2 to 8 parts by weight per 100 parts by weight of the thermoplastic resin.

[0034] To enhance various physical properties, the coating layer 27 may contain additives conventionally used in synthetic resins, such as fillers, UV absorbers, antistatic agents, matting agents, mica powder, organic fibers, vermiculite powder, glass chips, waste paper powder, and ceramic powder. Examples of fillers that can be used include calcium carbonate and talc. The content of additives other than fillers is preferably 5 parts by weight or less per 100 parts by weight of the thermoplastic resin. The content of the filler is preferably 40 parts by weight or less, more preferably 5 to 20 parts by weight, per 100 parts by weight of the thermoplastic resin.

[0035] The covering layer 27 is preferably a so-called non-foamed material or a low-foamed material with an expansion ratio of 5 times or less, particularly 2 times or less, and more preferably a non-foamed material.

[0036] The surface of the coating layer 27 is preferably sanded. This sanding process involves roughening the surface of the integrally extruded body 20 along the extrusion direction using a file, emery paper, sand, or the like. By performing the sanding process, fine irregularities, particularly streaky grooves, are formed on the surface of the coating layer 27, giving it a wood-like appearance.

[0037] The surface of the coating layer 27 is not limited to a single color tone, but may be one that uses a plurality of coloring agents to express a wood grain pattern or the like, or may even be printed with a wood grain pattern or the like.

[0038] Returning to FIG. 1, the overall dimensions of the elongated member 10 are not particularly limited and can be the same as those of building materials made of wood. Regarding the thickness of the elongated member 10, if the cross section is rectangular, the short side is preferably 10 to 60 mm, more preferably 15 to 40 mm, and the long side is preferably 150 mm or less. In the general case where the cross section is not rectangular, the minimum width is preferably 10 to 60 mm, more preferably 15 to 40 mm, and the maximum width is preferably 150 mm or less, where the width is the distance between two parallel lines that sandwich the outline of the cross section. The length of the elongated member 10 is preferably 300 to 3,000 mm, more preferably 500 to 2,000 mm.

[0039] The twisted portion 11 occupies the entire elongated member 10 or a portion of the elongated member 10 in the longitudinal direction. If one rotation of the integrally extruded body 20 is defined as a 360° rotation around its axis C, and the number of rotations is referred to as the "number of rotations of the twisted portion," then it is preferable that the number of rotations of the twisted portion be a natural number. This makes the rotation angles at both ends of the elongated member equal, facilitating construction when the elongated member is used as a building component.

[0040] Furthermore, the rotation density of the twisted portion is preferably 1 to 2 rotations per meter of the length of the twisted portion, since this has a significant effect on the design of the appearance of the twisted portion.

[0041] FIG. 4 shows a louver (screening material) according to one embodiment. The louver is an example of the application of the long member 10 according to the above embodiment as a building component. The louver 30 in FIG. 4 is constructed by vertically arranging the long member 10 and a straight tubular integrally extruded body 20 horizontally, sandwiching them between upper and lower crosspieces 31 and 32. The portions of the long member that are not twisted at both ends are respectively fitted into the upper and lower crosspieces 31 and 32 and hidden. When constructing louvers using long members, an excellent aesthetic appearance can be achieved by mixing long members with different twist speeds, or by mixing long members with integrally extruded bodies without twisted portions, as shown in FIG. 4. Using the long member 10 as a building component in this way is preferable because its shape has a particularly surprising effect on the viewer.

[0042] Next, a method for manufacturing the elongated member 10 of this embodiment will be described.

[0043] The integral extrusion molded body 20 can be produced by the following method. An integral extrusion molding machine 40 shown in Figure 5 is equipped with two extruders 41 and 43, and while the core material 21 is inserted through the openings of dies 42 and 44 and fed in one direction (to the left in Figure 5), the core material is successively coated with an adhesive layer 26 and a coating layer 27 at each die, respectively.

[0044] The adhesive layer 26 is formed by coating the surface of the core material 21 with an adhesive layer composition extruded from an extruder 41 in a die 42. The adhesive layer may be formed by integral extrusion molding or by applying an adhesive to the surface of the core material in advance by spraying, dipping, or the like.

[0045] A raw material mixture containing thermoplastic resin pellets, wood flour, and a colorant is used as the raw material for the coating layer 27. The core material 21 coated with the adhesive layer 26 is inserted into the opening of a die 44, and the raw material mixture kneaded in an extruder 43 is extruded onto the adhesive layer 26 within the die 44, thereby forming the coating layer 27.

[0046] Next, the integral extrusion molded body 20 is cooled, and the coating layer 27 hardens. The surface of the integral extrusion molded body is sanded and cut to the required dimensions. A pattern such as wood grain may be printed on the surface of the integral extrusion molded body. In this manner, a straight tubular integral extrusion molded body 20 is produced. Note that sanding becomes extremely difficult after twisting, so sanding must be performed before twisting.

[0047] The integral extrusion molded body 20 is then twisted. Referring to FIG. 6 , both ends of the integral extrusion molded body are held by a first holding mechanism 51 and a second holding mechanism 52. The first holding mechanism and the second holding mechanism hold the integral extrusion molded body by inserting fitting portions 53, which fit into openings in the core material 21, into the openings. The first holding mechanism 51 is rotated around the axis C of the integral extrusion molded body to form the twisted portion 11. To perform the twisting process, the first holding mechanism and the second holding mechanism are simply rotated relative to each other around the axis C; for example, both the first holding mechanism and the second holding mechanism may be rotated in opposite directions.

[0048] The first holding mechanism 51 and the second holding mechanism 52 are relatively movable in the longitudinal direction of the integral extrusion molded body 20. As the integral extrusion molded body is twisted, its overall length becomes shorter, and accordingly, the second holding mechanism 52 is moved closer to the first holding mechanism 51.

[0049] 6, the first holding mechanism 51 and the second holding mechanism 52 hold the integrally extruded body 20 by fitting the fitting portion 53 inside the core material 21, but the holding method is not limited to this. For example, when the held portion is hidden due to twisting during construction of the elongated member 10, if it does not matter if the coating layer 27 at the held portion is crushed, the integrally extruded body may be gripped and held from the outside. [Example]

[0050] A hollow aluminum alloy core material with a roughly rectangular cross section was manufactured by extrusion molding, as shown in Figure 1. After grooves (0.5 mm pitch, 0.1 mm depth) extending in the longitudinal direction were formed in the core material by knurling, an oxide film was formed by anodizing (sulfuric acid method, no sealing treatment).

[0051] For the adhesive layer, Bondfast (registered trademark) 7B (manufactured by Sumitomo Chemical Co., Ltd., ethylene-glycidyl methacrylate-vinyl acetate (copolymerization ratio (weight ratio) 83:12:5), MFR 7g / 10min, melting point 95°C) was used as an epoxy group-containing polyolefin resin.

[0052] The coating layer was made by mixing 100 parts by weight of maleic acid-modified polypropylene resin (maleic acid content approximately 2% by weight, melting point 150°C, MFR approximately 10 g / min) with 10 parts by weight of wood flour (particle size 100 mesh or less), 5.2 parts by weight of light brown colorant, and 15 parts by weight of filler (talc).

[0053] Using a co-extrusion type integrated extrusion molding machine as shown in Figure 5, the adhesive layer composition was fed into extruder 41 and the coating layer raw materials were fed into extruder 43, and an integrated extrusion molded article was produced by the method of the above embodiment. The core material was preheated to about 100°C just before insertion into the die 42 for the adhesive layer. The extrusion conditions were as follows: Adhesive layer extruder 41: 40φ, single screw extruder (extrusion temperature approx. 140℃) · Coating layer extruder 43:50φ, single screw extruder (extrusion temperature approx. 165℃)

[0054] After the integral extrusion molding, the molded body was cooled in a water-cooled jacket (not shown), and the surface was sanded with a belt sander with a grit size of #100 that rotated in the opposite direction to the direction of movement of the molded body. As a result, a straight tubular integral extrusion molded body was obtained.

[0055] Next, the integrally extruded body was twisted using the method of the above embodiment, thereby producing long members of the example in which the length of the twisted portion was 1.8 m and the number of rotations of the twisted portion was 1, 2, 3, and 4.

[0056] FIG. 7 shows the long member of the example and the integrally extruded body of the comparative example that was not twisted.

[0057] The present invention is not limited to the above-described embodiments and examples, and various modifications are possible within the scope of the technical concept thereof. [Industrial Applicability]

[0058] The long member of the present invention is useful as a component for architectural components such as architectural decorative materials, handrails, security grilles, louvers, etc.; fixtures such as furniture, fixtures, lighting fixtures, etc.; various decorative objects; and three-dimensional sculptures such as objects for viewing. [Explanation of symbols]

[0059] 10 Long members 11 Torsion section 20 Integral extrusion molding 21 Core material 22 Peripheral wall 23 Partition Wall 24 Cross section of partition wall 25 T-shaped section of partition wall 26 Adhesive layer 27 Covering layer 30 louvers 31 Upper pier 32 Lower rail 40 Integrated extrusion molding machine 41 Extruder (for adhesive layer) 42 Die (for adhesive layer) 43 Extruder (for coating layer) 44 Die (for coating layer) 51 1st holding mechanism 52 Second holding mechanism 53 Fitting part C: Longitudinal axis of the integrally extruded body P Partition wall span

Claims

1. A long member made of an integrally extruded body and having a twisted portion, The integrally extruded body has a tubular aluminum core, an adhesive layer formed on the surface of the core, and a coating layer formed on the surface of the adhesive layer and containing a thermoplastic resin and wood powder, The core material has a peripheral wall having a rectangular cross section and partition walls that divide the internal space of the peripheral wall in the long side direction of the cross section, the partition walls do not have any cross-sectional portions, and the span of the partition walls is 10 mm or more and 30 mm or less, The surface of the coating layer is sanded, the twisted portion occupies the entire elongated member except for non-twisted portions at both ends of the elongated member, the integrally extruded body has a shape rotated around its longitudinal axis, and the number of rotations around the axis per meter of length is 1 or more and 2 or less. Long members.

2. the twisted portion has a shape obtained by rotating the integrally extruded body a natural number of times around the axis. The elongated member according to claim 1 .

3. A louver using the elongated member according to claim 1 or 2, The long members having different rotation speeds around the axis of the twisted portion are mixed together, or the long members and the integral extrusion molding body having no twisted portion are mixed together. louver.

4. A method for manufacturing a long member made of an integrally extruded body and having a twisted portion, comprising: The integrally extruded body has a tubular aluminum core material, an adhesive layer formed on the surface of the core material, and a coating layer formed on the surface of the adhesive layer and containing a thermoplastic resin and wood powder, the core material having a peripheral wall with a rectangular cross section and partition walls dividing the internal space of the peripheral wall in the long side direction of the cross section, the partition walls not intersecting each other in a crisscross pattern, the span of the partition walls being 10 mm or more and 30 mm or less, the surface of the coating layer being sanded, Both ends of the integrally extruded body are held by a first holding mechanism and a second holding mechanism that are relatively movable in the longitudinal direction; the first holding mechanism and the second holding mechanism are rotated relatively around the longitudinal axis of the integral extrusion molded body at least once and not more than twice per meter of length around the axis, thereby forming a twisted portion in the entire portion of the integral extrusion molded body between the first holding mechanism and the second holding mechanism. A method for manufacturing a long member.

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