Foam duct

Abstract

To provide a foam duct capable of suppressing the occurrence of a problem that an opening is deformed to disable the fitting of another member.SOLUTION: According to the present invention, there is provided a foam duct including a foam duct body and a load-receiving member, wherein the foam duct body is formed of a resin composition containing 50% by mass or more of a polyethylene-based resin and has an expansion ratio of 2.0 times or more, the foam duct body includes a tubular part having an opening, and the load-receiving member is disposed so as to receive a load applied to the tubular part at a position adjacent to the opening.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a foam duct. [Background technology]

[0002] For example, in air conditioners of automobiles, etc., tubular air conditioner ducts are used to ventilate air. As an example of an air conditioner duct, a foam duct made of a foamed resin obtained by foaming a thermoplastic resin with a foaming agent is known. Demand for foam ducts is expanding because they can simultaneously achieve high thermal insulation and lightweight properties. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-166896 A Summary of the Invention [Problem to be solved by the invention]

[0004] Polypropylene resins are often used as the resins constituting the foam duct, but polyethylene resins are sometimes used. Since polyethylene resins have lower rigidity than polypropylene resins, foam ducts made of polyethylene resins are prone to problems such as deformation of the opening when a load is applied to a position adjacent to the opening, making it impossible to fit other components.

[0005] The present invention has been made in consideration of the above circumstances, and provides a foam duct that can suppress the occurrence of problems such as the opening being deformed and making it impossible to fit other components thereto. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided. [1] A foam duct comprising a foam duct body and a load-receiving member, the foam duct body being made of a resin composition containing 50% by mass or more of a polyethylene-based resin and having a foaming ratio of 2.0 times or more, the foam duct body having a tubular portion having an opening, and the load-receiving member being positioned so as to receive a load applied to the tubular portion at a position adjacent to the opening. [2] A foam duct as described in [1], wherein the tubular portion includes an upper wall on which the load-receiving member is disposed, a lower wall opposite the upper wall, and of a pair of walls connecting the upper wall and the lower wall, a right wall disposed on the right side when the opening is viewed from the outside, and a left wall disposed on the left side, and the load-receiving member is arranged to straddle a right adjacent position adjacent to the right wall and a left adjacent position adjacent to the left wall. [3] A foam duct as described in [1], wherein the tubular portion includes an upper wall on which the load-receiving member is disposed, a lower wall opposite the upper wall, and of a pair of walls connecting the upper wall and the lower wall, a right wall disposed on the right side when the opening is viewed from the outside, and a left wall disposed on the left side, and the load-receiving member includes a right load-receiving member provided in a right adjacent position adjacent to the right wall, and a left load-receiving member provided in a left adjacent position adjacent to the left wall, and the right load-receiving member and the left load-receiving member are separated from each other. [4] A foam duct according to any one of [1] to [3], wherein the direction in which the upper wall and the lower wall face each other is defined as the up-down direction, the direction perpendicular to the up-down direction is defined as the left-right direction, and the outer dimension of the tubular portion in the up-down direction at the portion where the load-receiving member is disposed is defined as L1, and the outer dimension in the left-right direction perpendicular to the up-down direction is defined as L2, such that L1 / L2 is 0.9 or less. [5] A foam duct according to any one of [1] to [4], wherein the load-receiving member is made of a foam having a higher foaming ratio than the foam duct body.

[0007] In the foam duct of the present invention, a load-receiving member is positioned so as to receive the load applied to the tubular portion at a position adjacent to the opening, thereby suppressing deformation of the opening and preventing it from becoming impossible to fit other components. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic plan view showing an overall configuration of a foam duct 1 according to a first embodiment of the present invention, in which a surface on the side of a lower wall 2bb (shown in FIG. 2C) is visible. [Diagram 2] FIG. 2 is a perspective view of a portion of region A in FIG. [Diagram 3] 3A is a plan view of the foam duct 1 in FIG. 2, FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A, and FIG. 3C is a cross-sectional view taken along line CC in FIG. 3A. [Figure 4] FIG. 3 is a view corresponding to FIG. 2, showing a foam duct 1 according to a second embodiment of the present invention. [Diagram 5] 5A to 5C are views of the foam duct 1 of FIG. 4 corresponding to FIGS. 3A to 3C. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present invention will be described. Various features shown in the following embodiments can be combined with each other. Also, each feature can be an invention independently.

[0010] 1. First embodiment 1-1. Structure of foam duct 1 A foam duct 1 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 3. The foam duct 1 according to this embodiment is a lightweight foam duct for circulating air supplied from an air conditioning unit to a desired location. The foam duct 1 includes a foam duct body 2 and a load-receiving member 3. Each component will be described in detail below.

[0011] <Basic configuration of foam duct body 2> The foam duct body 2 is made of a resin composition containing 50% by mass or more of a polyethylene resin. The ratio of the polyethylene resin in the resin composition is, for example, 50 to 100% by mass, preferably 80 to 100% by mass, specifically, for example, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100% by mass, or may be in a range between any two of the numerical values ​​exemplified here.

[0012] The polyethylene resin is a resin in which 80% by mass (preferably 85, 90, or 95% by mass) or more of the monomer units are polyethylene. Examples of the polyethylene resin include ethylene homopolymers, ethylene copolymers which are copolymers of ethylene and other olefins (e.g., α-olefins such as 1-butene), and acid-modified polyethylene. Examples of the ethylene homopolymers include high-density polyethylene (HDPE) and low-density polyethylene (LDPE). Examples of the ethylene copolymers include linear low-density polyethylene (LLDPE). The ratio of other olefin units in the ethylene copolymer is, for example, 1 to 20% by mass, specifically, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, and 20% by mass, and may be in the range between any two of the numerical values ​​exemplified here. For example, when the total of HDPE and LDPE is 100% by mass, the ratio of HDPE in the polyethylene resin in the resin composition is preferably 20 to 60% by mass, and more preferably 30 to 50% by mass. The density of HDPE is, for example, 0.941 g / cm 3 The density of LDPE is 0.910 to 0.940 g / cm 3 It is.

[0013] Resins other than polyethylene-based resins in the resin composition include polyolefins other than polyethylene-based resins, and examples of such polyolefins include polypropylenes (homopolypropylene, random polypropylene, block polypropylene, etc.). In addition to resins, the resin composition may contain various additives such as foam nucleating agents (e.g., sodium bicarbonate and citric acid), antioxidants, and colorants.

[0014] The foam duct body 2 has an expansion ratio of 2.0 times or more, preferably 3.0 times or more. The expansion ratio is, for example, 2.0 to 6.0 times, specifically, for example, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0 times, and may be in the range between any two of the numerical values ​​exemplified here.

[0015] When the foam duct body 2 is formed from the above resin composition and with the above expansion ratio, the rigidity of the foam duct body 2 tends to be low, so that the technical significance of applying the present invention is remarkable.

[0016] The average thickness of the foam duct body 2 is, for example, 2.0 to 6.0 mm, specifically, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0 mm, and may be in the range between any two of the numerical values ​​exemplified here. The smaller the average thickness, the smaller the rigidity of the foam duct body 2 tends to be, so that the technical significance of applying the present invention becomes more prominent.

[0017] As shown in Fig. 1, the foam duct body 2 has, for example, a supply port 2a opened to connect to other air conditioning members (not shown) of the air conditioning unit, and tubular parts 2b each branching from the opening of the supply port 2a. In this embodiment, four tubular parts 2b are provided. Each of the tubular parts 2b has a pipe body 2c which is a flow path for circulating the air taken in from the supply port 2a. Each of the tubular parts 2b has an opening 2d.

[0018] As shown in Figs. 2 and 3, a fitting portion 2e and a tapered portion 2f are provided in this order from the pipe body 2c side at a position adjacent to the opening 2d. The fitting portion 2e is connected to the pipe body 2c, and is a portion into which another member is internally fitted, and is preferably a portion having a larger diameter than the pipe body 2c. Moreover, it is more preferable that the fitting portion 2e has a larger diameter than the pipe body 2c. The tapered portion 2f is connected to the fitting portion 2e, and is a portion whose diameter gradually increases toward the opening 2d. By providing the tapered portion 2f, it becomes easier to fit another member into the fitting portion 2e.

[0019] The foam duct body 2 may have a different configuration, for example, a structure without a branch, a structure in which the fitting portion 2e is not enlarged, or a structure without the tapered portion 2f. In any case, the foam duct body 2 includes a tubular portion 2b having an opening 2d. The opening 2d may be a supply port for air circulating inside the foam duct body 2, or may be an air outlet. In addition, it is preferable that the tubular portion 2b included in the foam duct body 2 is provided with both an opening serving as an air supply port and an opening serving as an air outlet.

[0020] <Arrangement and configuration of the load-receiving member 3, and detailed structure of the tubular portion 2b> The load-receiving member 3 is positioned so as to receive a load applied to the tubular portion 2b at a position adjacent to the opening 2d (hereinafter referred to as the "opening adjacent position P"). The load-receiving member 3 is positioned so as to overlap the opening adjacent position P. By positioning the load-receiving member 3 at the opening adjacent position P, deformation of the tubular portion 2b can be suppressed at the position adjacent to the opening 2d. Therefore, even when another member is fitted into the fitting portion 2e provided at a position adjacent to the opening 2d, the occurrence of fitting defects due to deformation of the tubular portion 2b can be suppressed. The opening 2d is surrounded by an opening end 2g.

[0021] The opening adjacent position P is a position adjacent to the opening 2d, and is a position where deformation of the tubular portion 2b should be suppressed. When the fitting portion 2e is provided, it is preferable that the fitting portion 2e is set as the opening adjacent position P. When another member is inserted into the opening 2d, it is preferable that any position within the range of the length of the other member inserted is set as the opening adjacent position P. For example, when the insertion length of the other member is 30 mm, it is preferable that any position within the range of 30 mm from the opening end 2g is set as the opening adjacent position P. The insertion length of the other member is, for example, 10 to 50 mm, and preferably 15 to 40 mm. Specifically, this length is, for example, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm, and may be in a range between any two of the numerical values ​​exemplified here.

[0022] The length from the opening end 2g to the opening adjacent position P is, for example, 0 to 50 mm, and preferably 5 to 40 mm. Specifically, this length may be, for example, 0, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm, and may be in the range between any two of the numerical values ​​exemplified here. By disposing the load receiving member 3 at the opening adjacent position P thus determined, deformation of the portion of the tubular portion 2b into which another member is inserted is effectively suppressed. Note that the length here means the length in the longitudinal direction DL of the tubular portion 2b at the portion of the tubular portion 2b including the opening 2d.

[0023] The load-receiving member 3 can be disposed at the opening adjacent position P by any method, such as by using double-sided tape, adhesion, welding, engagement, etc. From the viewpoint of ease of operation, it is preferable to attach the load-receiving member 3 to the opening adjacent position P by using double-sided tape.

[0024] The load-receiving member 3 may be any member capable of receiving the load applied to the tubular portion 2b, but is preferably made of a foam having a higher expansion ratio than the foam duct main body 2. In this case, the weight of the load-receiving member 3 is not increased even if the load-receiving member 3 is made thicker, so that the load-receiving member 3 can be easily made thicker, and as a result, the effect of suppressing deformation of the tubular portion 2b can be easily improved. The expansion ratio of the load-receiving member 3 is, for example, 2.5 times or more, preferably 2.5 to 30 times, and more preferably 5 to 20 times. Specifically, the expansion ratio is, for example, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, or 30 times, and may be in the range between any two of the numerical values ​​exemplified here or more than any one of them.

[0025] The average thickness of the load-receiving member 3 is, for example, 3 to 30 mm, preferably 5 to 20 mm, and specifically, for example, 3, 5, 10, 15, 20, 25, or 30 mm, and may be in the range between any two of the numerical values ​​exemplified here. The depth (length along the direction DL) of the load-receiving member 3 is, for example, 5 to 30 mm, and specifically, for example, 5, 10, 15, 20, 25, or 30 mm, and may be in the range between any two of the numerical values ​​exemplified here.

[0026] The material constituting the load-receiving member 3 is not particularly limited, but considering the recyclability of the foam duct 1, it is preferable to construct it from a resin composition containing 50% or more by mass of a polyethylene-based resin, similar to the foam duct main body 2, and it is even more preferable to construct it from polyethylene.

[0027] The tubular portion 2b preferably includes an upper wall 2bu on which a load receiving member 3 is provided, a lower wall 2bb facing the upper wall 2bu, and, of a pair of walls connecting the upper wall 2bu and the lower wall 2bb, a right wall 2br disposed on the right side when the opening 2d is viewed from the outside, and a left wall 2bl disposed on the left side. In this case, the load receiving member 3 can suppress deformation of the tubular portion 2b due to a load from above.

[0028] Here, the direction in which the upper wall 2bu and the lower wall 2bb face each other is the vertical direction D1, the direction perpendicular to the vertical direction is the horizontal direction D2, the outer dimension of the tubular portion 2b in the vertical direction D1 at the portion where the load receiving member 3 is disposed is L1, and the outer dimension of the tubular portion 2b in the horizontal direction D2 perpendicular to the vertical direction is L2. L1 / L2 is preferably 0.9 or less, more preferably 0.8 or less. In this case, the tubular portion 2b has a flat shape so that the horizontal direction is longer, and the rigidity of the upper wall 2bu near the center in the horizontal direction is likely to be low, so the technical significance of applying the present invention is remarkable. L1 / L2 is, for example, 0.2 to 0.9, specifically, for example, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and may be in the range between any two of the numerical values ​​exemplified here or less than any of them.

[0029] L2 is, for example, 60 to 200 mm, and preferably 80 to 160 mm. This value is, for example, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, and 200 mm, and may be in the range between any two of the numerical values ​​exemplified here. When the length of the load receiving member 3 in the left-right direction D2 is L3, L3 / L2 is, for example, 0.05 or more, for example, 0.1 to 1.2, and preferably 0.6 to 1.0. This value is, for example, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, and 1.2, and may be in the range between any two of the numerical values ​​exemplified here. L3 is, for example, 60 to 140 mm, specifically, for example, 60, 70, 80, 90, 100, 110, 120, 130, or 140 mm, or may be in a range between any two of the numerical values ​​exemplified here.

[0030] The load-receiving member 3 is preferably provided so as to straddle the right adjacent position Pr adjacent to the right wall 2br and the left adjacent position Pl adjacent to the left wall 2bl. Since the load applied to the right adjacent position Pr and the left adjacent position Pl is supported by the right wall 2br and the left wall 2bl, the strength of the tubular portion 2b tends to be relatively high at the right adjacent position Pr and the left adjacent position Pl. Therefore, when the load-receiving member 3 is disposed so as to straddle the right adjacent position Pr and the left adjacent position Pl, the load-receiving member 3 functions as a beam and can suppress deformation of the tubular portion 2b. Furthermore, even if the tubular portion 2b is deformed, the restoring force of the load-receiving member 3 makes it easy for the tubular portion 2b to return to its original shape.

[0031] The right adjacent position Pr and the left adjacent position Pl are preferably positions within a range of α×L2 from the right end 2br1 and the left end 2bl1 of the tubular portion 2b, respectively. α is, for example, 0.3, specifically, for example, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, or may be in a range between any two of the numerical values ​​exemplified here.

[0032] It is preferable that two adjacent walls among the upper wall 2bu, the lower wall 2bb, the right wall 2br, and the left wall 2bl are connected to each other by a corner wall 2bc. The corner wall 2bc has a smaller radius of curvature than each of the upper wall 2bu, the lower wall 2bb, the right wall 2br, and the left wall 2bl. In this way, it is preferable that the tubular portion 2b has a structure in which the relatively flat upper wall 2bu, the lower wall 2bb, the right wall 2br, and the left wall 2bl are connected to each other by the corner wall 2bc.

[0033] If the radii of curvature of the upper wall 2bu, the lower wall 2bb, the right wall 2br, the left wall 2bl, and the corner wall 2bc are Ru, Rb, Rr, Rl, and Rc, respectively, Ru / Rc, Rb / Rc, Rr / Rc, Rl / Rc, Ru / Rr, and Ru / Rl are preferably 2 or more, and more preferably 3 or more. This value is, for example, 2 to 10000, and may be 2, 5, 10, 20, 30, 40, 50, 100, 1000, or 10000, and may be in the range between any two of the numerical values ​​exemplified here or any more. Ru is preferably 100 mm or more, and more preferably 150 mm or more. In this case, since the curvature of the upper wall 2bu is small, it is easy to arrange the load receiving member 3. Ru is, for example, 100 to 10,000 mm, specifically, for example, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1,000, 5,000, 10,000 mm, and may be in the range between any two of the numerical values ​​exemplified here or equal to or greater than any one of them.

[0034] 1-2. Manufacturing method of foam duct 1 The foam duct 1 can be manufactured by attaching a load-receiving member 3 to a foam duct body 2.

[0035] The foam duct body 2 is preferably formed by performing post-processing such as forming an opening on a foam molded body formed by direct blow molding. In direct blow molding, the foam duct body 2 can be manufactured by sandwiching a molten parison extruded from an extruder between a pair of split dies and blowing air into the parison. The parison may be in the form of a cylinder or a pair of resin sheets. In the extruder, it is preferable to knead the molten resin and the foaming agent. The foaming agent may be a physical foaming agent or a chemical foaming agent.

[0036] 2. Second embodiment A second embodiment of the present invention will be described with reference to Figures 4 and 5. This embodiment is similar to the first embodiment, and the contents described in the first embodiment can also be applied to this embodiment as long as they are not contrary to the spirit of the first embodiment. This embodiment differs mainly from the first embodiment in the configuration of the load receiving member 3. The following description will focus on the differences.

[0037] In this embodiment, the load receiving member 3 includes a right load receiving member 3r provided at the right adjacent position Pr and a left load receiving member 3l provided at the left adjacent position Pl, and the right load receiving member 3r and the left load receiving member 3l may be configured to be separated from each other. In this case, an object that applies a load to the tubular portion 2b is strongly pressed against the right load receiving member 3r or the left load receiving member 3l, and the load applied to the right adjacent position Pr and the left adjacent position Pl is likely to become large. The load applied to the right adjacent position Pr and the left adjacent position Pl is received by the right wall 2br and the left wall 2bl, which have relatively high strength, so that the deformation of the tubular portion 2b can be suppressed by providing the right load receiving member 3r and the left load receiving member 3l.

[0038] In this embodiment, L3 / L2 is, for example, 0.05 to 0.4, and preferably 0.1 to 0.3. This value is, for example, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, or 0.40, and may be in a range between any two of the values ​​exemplified here. L3 is, for example, 5 to 40 mm, and specifically, 5, 10, 15, 20, 25, 30, 35, or 40 mm, and may be in a range between any two of the values ​​exemplified here. EXAMPLES

[0039] 1. Manufacturing of foam duct 1 <Example 1> A foamed molded body was produced by direct blow molding, and an opening was formed in this foamed molded body to produce a foamed duct body 2 having the shape shown in Figures 1 to 3, an expansion ratio of 4.0 times, and an average thickness of 3 mm. The raw resin used was a mixture of HDPE / LDPE / foaming nucleating agent (sodium bicarbonate & citric acid type) / antioxidant / black master batch in a mass ratio of 40 / 60 / 1 / 4 / 1. The dimensions of the foamed duct body 2 at a position 15 mm from the opening 2d were as follows. L1: 61mm L2: 126mm Ru: 440mm Rb:391mm Rr: 77mm Rl:76mm Rc: 15mm

[0040] Next, the load-receiving member 3 was attached to the foam duct body 2 using double-sided tape as shown in Figures 2 and 3 to obtain the foam duct 1. As the load-receiving member 3, a polyethylene foam with an expansion ratio of 10 times, a thickness of 10 mm, a left-right width of 105 mm, and a depth of 15 mm was used.

[0041] <Example 2> A foam duct 1 was manufactured in the same manner as in Example 1, except that a polyethylene foam having an expansion ratio of 15, a thickness of 10 mm, a length in the left-right direction of 105 mm, and a depth of 15 mm was used as the load-receiving member 3.

[0042] <Example 3> The foam duct 1 was manufactured in the same manner as in Example 1, except that two polyethylene foams with an expansion ratio of 15, a thickness of 10 mm, a length in the left-right direction of 15 mm, and a depth of 15 mm were used as the load-receiving members 3 and attached with double-sided tape at the right adjacent position Pr and the left adjacent position Pl as shown in Figures 4 and 5. The distance between the two load-receiving members 3 was 90 mm.

[0043] <Comparative Example 1> The foam duct 1 was produced in the same manner as in Example 1, except that the load-receiving member 3 was not attached.

[0044] 2. Load-bearing test The deformation amount of the fitting portion 2e was measured when a presser having a width of 110 mm and a depth of 27 mm was pressed against the load-receiving member 3 or the fitting portion 2e with a load of 4 kgf. In Examples 1 to 3, the deformation amount was about 1 mm, whereas in Comparative Example 1, it was about 3 mm, which shows that the deformation of the tubular portion 2b can be suppressed by the load-receiving member 3. [Explanation of symbols]

[0045] 1: Foam duct 2: Foam duct body 2a: Supply port 2b: Tubular part 2bb: Bottom wall 2bc: Corner wall 2bl:Left wall 2bl1: Left end 2br: Right wall 2br1 :Right end 2bu: Upper wall 2c: tube body 2d:Aperture 2e: Fitting part 2f: Tapered section 2g:Open end 3: Load-bearing member 3l: Left load-receiving member 3r: Right load-receiving member D1: Vertical direction D2: Left / right direction DL: Longitudinal direction P: Position adjacent to the opening Pl: Left adjacent position Pr: Right adjacent position

Claims

1. A foam duct comprising a foam duct body and a load receiving member, The foam duct body is made of a resin composition containing 50% by mass or more of a polyethylene resin and has an expansion ratio of 2.0 times or more; The foam duct body includes a tubular portion having an opening; A foam duct, wherein the load-receiving member is positioned to receive a load applied to the tubular portion at a position adjacent to the opening.

2. 2. The foam duct of claim 1, the tubular portion includes an upper wall on which the load-receiving member is disposed, a lower wall opposite the upper wall, and, of a pair of walls connecting the upper wall and the lower wall, a right wall disposed on the right side when the opening is viewed from the outside, and a left wall disposed on the left side, The foam duct, wherein the load-receiving member is provided to straddle a right adjacent position adjacent to the right wall and a left adjacent position adjacent to the left wall.

3. 2. The foam duct of claim 1, the tubular portion includes an upper wall on which the load-receiving member is disposed, a lower wall opposite the upper wall, and, of a pair of walls connecting the upper wall and the lower wall, a right wall disposed on the right side when the opening is viewed from the outside, and a left wall disposed on the left side, the load receiving member includes a right load receiving member provided at a right adjacent position adjacent to the right wall and a left load receiving member provided at a left adjacent position adjacent to the left wall, The right load receiving member and the left load receiving member are separated from each other.

4. A foam duct according to any one of claims 1 to 3, A direction in which the upper wall and the lower wall face each other is defined as a vertical direction, and a direction perpendicular to the vertical direction is defined as a horizontal direction, A foam duct in which the outer dimension in the vertical direction of the tubular portion at the location where the load-receiving member is located is L1, and the outer dimension in the left-right direction perpendicular to the vertical direction is L2, such that L1 / L2 is 0.9 or less.

5. A foam duct according to any one of claims 1 to 3, A foam duct, wherein the load-receiving member is made of a foam having a higher foaming ratio than the foam duct body.

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