Resin coated long body

Abstract

To provide a resin-coated long body capable of suppressing peeling and strength reduction of a coating resin near corners of a step portion when a core material having a stepped shape is coated with a resin.SOLUTION: There is provided a resin-coated long body 100 that comprises: a metal core material 10 having step portions 30 formed on an outer surface 11 and a hollow portion 13 formed inside thereof; and a coating resin layer 20 made of a synthetic resin that covers the outer surface 11 including the step portion 30 of the core material 10. The resin-coated long body 100 is configured in that: the step portion 30 includes one side portion 31 and the other side portion 32; the one side portion 31 is connected to an intermediate crosspiece formed toward the opposite outer surface 11; in the other side portion 132, a dovetail groove-shaped first groove portion 133 adjacent to an intermediate crosspiece 40 is formed toward inside of the core material 10; and the step portion 30 includes one side portion 31 and the other portion 32; in the other side portion 32, a dovetail groove-shaped groove portion 33 adjacent to the intermediate crosspiece 40 is formed toward inside of the core material 10; and a part of the synthetic resin is inserted inside the groove portion 33.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a resin-coated plastic material having a metal core material and a resin coating layer made of synthetic resin coated on the outer surface of the metal core material. This relates to a long body. [Background technology]

[0002] As a resin-coated long body having a coating resin layer coated on the outer surface of a metal core material, the applicant has proposed a resin-coated long body in which a coating resin layer is formed using a synthetic resin on the outer surface of a metal core material, a part of the cross section is provided as an uncoated portion where no coating resin layer is provided, a dovetail-shaped anti-slip groove is provided near the boundary between the edge of the coating resin layer of the core material and the uncoated portion, and a part of the coating resin layer fits into the anti-slip groove, the coating resin layer is provided to cover the opening of the anti-slip groove, and the opening of the anti-slip groove and the edge of the coating resin layer are provided in different positions, the core material has a rectangular cross section, a coating resin layer is provided on the outside of three sides of the rectangle, and the remaining side is an uncoated portion (Patent Document 1).

[0003] Furthermore, the applicant has proposed a resin-coated long body comprising a metal core material having an inwardly recessed concave surface formed on its outer surface along the longitudinal direction, and a coating resin layer covering the outer surface of the core material including the concave surface, in which a dovetail-shaped anti-slip groove is formed on the concave surface of the core material toward the inside of the core material, and a part of the coating resin layer fits into the anti-slip groove (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-213198 A [Patent Document 2] JP 2013-227777 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when the outer surface of the core material is resin-coated, the core material may or may not have a rectangular cross section. In Patent Document 1, the core material has a rectangular cross section, so if a part of the resin coating layer is inserted into the retaining groove, the risk of the resin coating layer coming off can be effectively reduced even if a part of the cross section has an uncoated portion that is not coated with resin. In contrast, in Patent Document 2, the core material does not have a rectangular cross section, but has an inwardly recessed portion, so that a retaining groove is also formed on the recessed surface to prevent the resin coating layer covering the recessed portion from peeling off.

[0006] The core material is generally hollow and its cross-sectional shape is often elongated or horizontally elongated rather than rectangular, so that intermediate bars are formed to divide the hollow portion in the longitudinal direction in order to increase its strength. Since the intermediate bars also lead to increased strength in the vicinity of where they are formed, if the core material has an elongated shape, they are often formed near the recessed portion described above.

[0007] Here, an example of a case where the cross section of the core material is not rectangular is a stepped shape. In this case, the intermediate rail is often formed from the corner of the step toward the outer circumferential surface of the opposing core material in order to increase the strength of the corner of the step.

[0008] Furthermore, when coating a stepped core material, there is a risk of the coating resin peeling off near the corners of the steps, so it is preferable to have an anti-slip groove; however, this can result in bends or notches being formed near the corners, which could reduce the strength of the core material.

[0009] The present invention provides a resin-coated long body which solves the above-mentioned problems and which, when a stepped core material is resin-coated, can suppress peeling of the coating resin and reduction in strength near the corners of the steps. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention has the following configuration. That is, the resin-coated long body according to the present invention is a resin-coated long body comprising a metal core member having a step portion formed on its outer surface along the longitudinal direction and a hollow portion formed inside along the longitudinal direction, and a coating resin layer made of synthetic resin that covers the outer surface of the core member including the step portion, wherein the step portion has one side portion and the other side portion, the one side portion is connected to an intermediate rail formed toward the opposing outer surface, and the other side portion has a dovetail-shaped first groove portion adjacent to the intermediate rail formed toward the inside of the core member, and an opening is formed in the on the other hand a part of the coating resin layer fits inside the first groove formed so as to face the side of the core material, a dovetail-shaped anti-slip groove portion different from the first groove portion is formed on the outer surface of the core material facing inward of the core material, a part of the coating resin layer fits inside the anti-slip groove portion, the anti-slip groove portion is formed on both sides of the one side portion and the other side portion, and each anti-slip groove portion is formed so that on the outer surface of the core material covered with a resin coating layer, the distance between the first groove portion and the anti-slip groove portion on the other side portion is longer than the distance between the first groove portion and the anti-slip groove portion on the one side portion. Effect of the Invention

[0011] According to the present invention, when a stepped core material is resin-coated, peeling of the coating resin near the step can be suppressed, and a decrease in the strength of the core material can be suppressed. [Brief description of the drawings]

[0012] [Figure 1] 1 is an explanatory diagram showing one embodiment of a resin-coated long body according to the present invention; [Diagram 2] FIG. 2 is a partially enlarged view of the core material of FIG. [Diagram 3] FIG. 2 is a partially enlarged view of FIG. [Figure 4] FIG. 11 is an explanatory diagram showing a comparative example of a core material. [Diagram 5] 10A and 10B are explanatory diagrams showing another embodiment of a resin-coated long body according to the present invention. [Figure 6]1 is a plan view showing one embodiment of a bench using a resin-coated long body according to the present invention; [Figure 7] FIG. 8 is a side view of FIG. [Figure 8] FIG. 7 is an enlarged cross-sectional view taken along line AA in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In the drawings, 10 is a core material, 20 is a coating resin layer that covers an outer surface 11 of the core material 10, and the resin-coated elongated body 100 according to the present invention is mainly composed of the core material 10 and the coating resin layer 20.

[0014] Fig. 1 is an explanatory diagram showing one embodiment of a resin-coated long body 100 according to the present invention, and shows a perspective view of the resin-coated long body 100 formed in the front-rear direction cut in the vertical direction. Fig. 2 is a partial enlarged view of the upper right end portion of the core material 10 in Fig. 1, and Fig. 3 is a partial enlarged view of the upper right end portion of the resin-coated long body 100 in Fig. 1. Here, unless otherwise specified, the left-right and up-down directions of the resin-coated long body 100 are the same as those in Fig. 1, and the description will be based on this.

[0015] In this embodiment, the core material 10 is a hollow, elongated body made of an aluminum alloy and having a continuous, uniform cross section. That is, the core material 10 has a thin-walled portion 12 forming an outer surface 11 and an inner hollow portion 13, and the thin-walled portion 12 has an upper surface portion 12a and a lower surface portion 12b that are formed with a gap between them in the vertical direction. The upper surface portion 12a and the lower surface portion 12b are connected by a crosspiece 14 formed along the vertical direction, and the hollow portion 13 is divided into a plurality of portions in the horizontal direction.

[0016] The core material 10 has a step portion 30 recessed inward at the side end, and in this embodiment, the step portion 30 is located at the upper right end and the lower left end. As shown in FIG. 2, the step portion 30 at the upper right end has one side portion 31 formed in a direction intersecting with the upper surface portion 12a, and the other side portion 32 forming the step portion 30 with the one side portion 31. The one side portion 31 is connected to the lower surface portion 12b via the intermediate rail 40 from the vicinity of the intersection with the other side portion 32. In this embodiment, at the upper right end of the core material 10, the one side portion 31 is formed downward from the right end of the upper surface portion 12a and is connected to the other side portion 32 at the vertical middle portion of the core material 10, and the one side portion 31 is further connected to the intermediate rail 40 formed toward the lower surface portion 12b through the hollow portion 13. The one side portion 31 and the intermediate rail 40 are formed in the same direction.

[0017] At the lower right end of the core material 10, the lower surface portion 12b extends further rightward than the right end of the upper surface portion 12a, and a rising portion 12c is formed rising upward from the right end of the lower surface portion 12b. The upper end of the rising portion 12c reaches the middle of the core material 10 in the height direction and is connected to the other side portion 32.

[0018] In the other side 32, a dovetail-shaped groove 33 is formed on the inside of the core 10, i.e., in FIG. 2, with an opening 33a facing downward from the upper side. The groove 33 includes the opening 33a, a bottom 33b wider than the opening 33a, side walls 33c, 33c formed obliquely downward from both ends of the opening 33a and connected to both ends of the bottom 33b, and a space 33d surrounded by these. The groove 33 is adjacent to the intermediate rail 40.

[0019] Fig. 4 is an explanatory diagram showing a comparative example of a core material. That is, Fig. 4 shows a comparative example having a different structure in the vicinity of groove portion 33 of step portion 30 from Fig. 2. As shown in Fig. 4, when groove portion 133 is formed at a position including the intersection of one side portion 131 and the other side portion 132, space portion 133d of groove portion 133 is located between one side portion 131 and intermediate bar 140 over the entire width direction of one side portion 131 or intermediate bar 140.

[0020] As a result, a bent portion is formed by the groove portion 133 near the point where one side portion 131 connects to the intermediate rail 140. In this state, when a load is applied to the core material 110, the bent portion by the groove portion 133 becomes a starting point for deformation.

[0021] 2, in this embodiment in which the groove 33 is adjacent to the intermediate rail 40, the above-mentioned deformation is less likely to occur. Here, the state in which the groove 33 is adjacent to the intermediate rail 40 means that the opening edge 33e on one side 31 side of the opening 33a of the groove 33 is located outside the one side 31 or the area when the one side 31 is virtually extended, and the one side 31 is formed integrally with the intermediate rail 40 from the opening edge 33e on the one side 31 side of the groove 33 through the side wall 33c to the bottom 33b. It is more preferable that the end of the space 33d of the groove 33 on the one side 31 side be in contact with the outside of the area when the one side 31 is virtually extended, or be located outside of that area.

[0022] The core material 10 is preferably formed using aluminum or an aluminum alloy, which is easy to extrude and lightweight, as in this embodiment, but other metals may also be used.

[0023] In addition, the step portion 30 formed at the lower left end of the core material 10 has a vertical and horizontal relationship that is reversed from that of the step portion 30 at the right end, and the same components as those already explained are given the same symbols and their explanations are omitted.

[0024] 1 and 2, the resin-coated long body 100 is formed by coating the outer surface 11 of the core material 10 with synthetic resin by thermoforming such as extrusion molding, and part of the molten synthetic resin penetrates into the grooves 33 during thermoforming to form the coating resin layer 20. By having the resin penetrate into the grooves 33, peeling of the coating resin near the steps 30 can be suppressed.

[0025] As described above, the groove 33 is located on the other side 32, adjacent to the intermediate rail 40. Here, in the core material 10, the upper surface 12a and the lower surface 12b are formed with the retaining groove 15 having a similar shape to the groove 33. Here, the coating resin layer 20 has a larger shrinkage rate than the metal core material 10 during thermal change (when cooling), and since the resin near the groove 33 and the retaining groove 15 is difficult to move, the resin therebetween behaves as if it is shrinking. Therefore, the greater the distance between the groove 33 and the retaining groove 15, the greater the shrinkage that occurs, and the tensile force that tries to pull out the resin in the groove 33 due to the shrinkage also becomes greater. In this embodiment, the distance between the groove portion 33 and the adjacent anti-slip groove portion 15 on the other side 32 is longer than that of the groove portion 33, so when the above-mentioned shrinkage occurs, the resin in the groove portion 33 is pulled relatively more strongly toward the other side 32. However, compared to a case in which the groove portion 33 is formed near the corner of the step portion 30 as shown in FIG. 3, or a case in which the groove portion 33 is formed on one side portion 31 (not shown), the resin in the groove portion 33 in this embodiment in which the groove portion 33 is formed on the other side portion 32 is less likely to be pulled out, and peeling of the coating resin layer 20 near the step portion 30 can be effectively suppressed.

[0026] As the synthetic resin for forming the coating resin layer 20, it is preferable to use a thermoplastic synthetic resin that melts during thermoforming and can flow into the dovetail groove portion 33, and examples of such resins include polyethylene, polypropylene, ABS resin, AAS resin, and polyvinyl chloride resin. If a thermoplastic synthetic resin that has adhesive properties with metal materials is used as the synthetic resin for forming the coating resin layer 20, the outer surface 11 of the core material 10 and the coating resin layer 20 are bonded to each other, making it even more difficult for the coating resin layer 20 to come off. Examples of the thermoplastic synthetic resin that has adhesive properties with the core material 10 include EVA (ethylene vinyl acetate copolymer), PVB (polyvinyl butyral), modified polyethylene modified with maleic anhydride, modified polypropylene, and copolymers of α-olefins and unsaturated carboxylic acids such as EAA resin. The synthetic resins described above may also be appropriately mixed with fillers such as silica powder, mica powder, talc, glass fiber, calcium carbonate, aluminum hydroxide, calcium hydroxide, clay, minerals, microballoons, metal powder, wood powder, and cellulose powder such as pulp.

[0027] 5 is an explanatory diagram showing another embodiment of a resin-coated elongated body 200 of the present invention. It is different from the resin-coated elongated body 100 shown in Figs. 1 and 2 in that the cross-sectional shape of the core material 10 is formed into a substantially arc shape. As for other configurations, for example, the core material 10 has a step portion 30 at its side end, the position of the groove portion 33 formed in the step portion 30, and the outer surface 11 of the core material 10 is coated with a synthetic resin to form the coating resin layer 20, etc., they are the same, so the same reference numerals are used for the same components as those already described, and their description will be omitted.

[0028] Fig. 6 to Fig. 8 show an embodiment of a bench 300 using the resin-coated long bodies 100, 200 according to the present invention, with Fig. 6 being a plan view, Fig. 7 being a side view, and Fig. 8 being a cross-sectional view taken along line AA in Fig. 6. In this manner, in the resin-coated long bodies 100, 200 shown in Figs. 1 and 4, the step portions 30 of the profile members 10 are fitted together via the coating resin layer 20 to form the seat and backrest of the bench 300. [Industrial Applicability]

[0029] According to the present invention, when a stepped core material is resin coated, peeling of the coating resin near the step can be suppressed and a decrease in strength of the core material can be suppressed, making it suitable for use in deck materials, louver materials, benches, etc. [Explanation of symbols]

[0030] 10 Core material 11 Exterior 12 Thin section 12a Top part 12b Bottom part 12c Rising part 13 Hollow part 14 Crosspiece 15 Retaining groove 20 Coating resin layer 30 Steps 31 One side 32 The other side 33 Groove 33a opening 33b bottom 33c Side wall part 33d Space 33e Opening edge 33e 40 Intermediate rail 100, 200 Resin coated long body 110 Core material 131 One side 132 The other side 133 Groove 133d Space section 140 Intermediate rail 300 Bench

Claims

[Claim 1] A resin-coated elongated body comprising a metal core member having a step portion formed on an outer surface thereof along a longitudinal direction and a hollow portion formed inside thereof along the longitudinal direction, and a coating resin layer made of a synthetic resin that coats the outer surface of the core member including the step portion, The step portion has one side portion and another side portion, The one side portion is connected to an intermediate bar formed toward the opposing outer surface, A first groove portion having a dovetail shape adjacent to the intermediate rail is formed in the other side portion toward the inside of the core material, a part of the coating resin layer is inserted into the first groove portion formed so that an opening faces the one side portion, a dovetail-shaped retaining groove portion different from the first groove portion is formed on an outer surface of the core material toward an inside of the core material, and a part of the coating resin layer is inserted into the retaining groove portion; The retaining groove is formed on both sides of the one side portion and the other side portion, A resin-coated long body, characterized in that on the outer surface of the core material coated with a resin coating layer, each anti-slip groove portion is formed so that the distance between the first groove portion and the anti-slip groove portion on the other side portion is longer than the distance between the first groove portion and the anti-slip groove portion on the one side portion.

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