WO2021070837A1 - Sealing material - Google Patents

Abstract

The present invention enables the achievement of a sealing material which is capable of suppressing the occurrence of a long crease in the center of curvature axis direction of bending if the sealing material is bent.　A sealing material (10) according to the present invention is configured such that: the thickness of a first thick part (16), which is on the center of curvature side of bending if the sealing material (10) is bent, is larger than the thickness of thin parts (20); and the stiffness of the first thick part (16) is higher than the stiffness of the thin parts (20). Consequently, if the sealing material (10) is bent, deformation in a direction around the axis that extends in the longitudinal direction of the sealing material (10) occurs in the thin parts (20), thereby shortening the dimensions of a main body part (12) in the width direction of the sealing material (10). Consequently, it becomes possible to suppress the occurrence of a crease in the first thick part (16).

Description

Sealing material

The present invention relates to a sealing material for sealing between members.

In the water blocking material disclosed in Japanese Patent Application Laid-Open No. 2008-138110, a coating layer is formed on the surface of a flexible base material. The coating layer is a polyurethane resin composed of a polyol, a polyisocyanate, a catalyst, and a water-repellent additive having a hydroxyl group.

The water blocking material disclosed in Japanese Patent Application Laid-Open No. 2008-138110 has a coating layer as described above, so that the water blocking material is bent, and the curved portion of the water blocking material is located on the bending center side of the curvature. Even if long wrinkles (folds) are formed in the direction of the central axis of curvature of bending, the decrease in water stoppage in the direction of the central axis of curvature is suppressed. However, such wrinkles still contribute to the decrease in water-stopping property, and from the viewpoint of water-stopping property and airtightness, that is, sealing property, it is preferable that the occurrence of such wrinkles can be suppressed.

In consideration of the above facts, an object of the present invention is to obtain a sealing material capable of suppressing the occurrence of long wrinkles in the direction of the central axis of curvature of bending when bending.

The sealing material of the first aspect is flexible in the axial direction with the thickness direction as the axial direction, and has an annular cross-sectional shape perpendicular to the longitudinal direction, or a main body portion in which a part of the annular is opened in the longitudinal direction. Axial in the longitudinal direction of the main body with respect to the first high-rigidity portion formed on the main body and which is the portion on the center of curvature side in the bent state of the main body and the first high-rigidity portion. It is provided with an easily deformable portion which is formed on the main body portion at a position deviated from the axial direction side as a direction and has a lower rigidity than the first high rigidity portion.

In the sealing material of the first aspect, the first high-rigidity portion is set in the portion of the main body portion on the curvature center side of the flexure in the bent state of the main body portion. An easily deformable portion is formed at a position deviated from the first high-rigidity portion toward the axial direction side with the longitudinal direction of the main body portion as the axial direction. This easily deformable portion has a lower rigidity than the first high-rigidity portion. Therefore, in the flexed state of the main body portion, bending deformation in the axial direction with the longitudinal direction of the main body portion as the axial direction occurs in the easily deformed portion.

In this way, the easily deformable portion bends in the circumferential direction of the main body portion, so that the distance between the portion of the main body portion on the curvature center side and the portion opposite to the curvature center is narrowed. When the main body is flexed, it is compressed in the longitudinal direction of the main body on the side opposite to the center of curvature of the flexure in the main body, and pulled in the longitudinal direction of the main body on the side opposite to the center of curvature of the flexure in the main body.

Here, if the above-mentioned bending deformation occurs in the easily deformed portion in the flexed state of the main body portion, the portion of the flexure portion of the main body portion on the curvature center side and the portion opposite to the curvature center The interval becomes narrower. As a result, compression in the longitudinal direction of the main body portion on the side of the center of curvature of the flexure in the main body portion and tension in the longitudinal direction of the main body portion on the side opposite to the center of curvature of the flexure in the main body portion are suppressed. In this way, by suppressing the compression of the main body in the longitudinal direction on the curvature center side of the flexure in the main body, wrinkles that extend long in the curvature center axis direction of the flexure are generated in the main body. It can be suppressed, and the deterioration of the sealing property due to the occurrence of such wrinkles can be suppressed.

Also, the easily deformable part of the main body has lower rigidity than the first high-rigidity part. Therefore, when the main body portion is bent, bending deformation is induced in the easily deformed portion of the main body portion rather than in the first high-rigidity portion, and the main body portion is induced by such bending deformation in the easily deformed portion. The occurrence of the above-mentioned wrinkles due to the occurrence of the flexure in the portion on the center side of the curvature of the flexure, that is, in the first high-rigidity portion is suppressed.

In the sealing material of the second aspect, in the sealing material of the first aspect, the wall thickness of the first high-rigidity portion in the main body portion is set to be thicker than the wall thickness of the easily deformable portion.

In the sealing material of the second aspect, the wall thickness of the first high-rigidity portion in the main body portion is set to be thicker than the wall thickness of the easily deformable portion. Therefore, the rigidity of the portion of the main body on the center side of the curvature of the flexure can be easily made higher than the rigidity of the easily deformed portion.

The sealing material of the third aspect is the sealing material of the second aspect, and the first high-rigidity portion in the main body portion is curved so as to bulge toward the center of curvature.

In the sealing material of the third aspect, the first high-rigidity portion in the main body portion is curved so as to bulge toward the center of curvature, whereby the wall thickness of the first high-rigidity portion in the main body portion becomes the easily deformable portion. It is gradually set thicker than the wall thickness. Therefore, the rigidity of the flexure on the center side of the curvature of the main body can be easily made higher than the rigidity of the easily deformed portion.

The sealant of the fourth aspect is the sealant of any one of the first to third aspects, wherein the sealant is located on a portion of the main body opposite to the center of curvature of the flexure. A second high-rigidity portion having a higher rigidity than the deformed portion is formed.

In the sealing material of the fourth aspect, a second high-rigidity portion having higher rigidity than the easily deformable portion is formed in a portion of the main body portion opposite to the portion on the side opposite to the portion on the curvature center side of the flexure. Therefore, when the main body is flexed, a second high-rigidity portion is set on the side of the main body opposite to the center of curvature of the flexure. This second high-rigidity portion has higher rigidity than the easily deformable portion. Therefore, bending deformation can be induced in the easily deformed portion having a lower rigidity than the high-rigidity portion of 2.

In the sealing material of the fifth aspect, in the sealing material of the fourth aspect, the wall thickness of the second high-rigidity portion in the main body portion is set to be thicker than the wall thickness of the easily deformable portion. Therefore, in the sealing material of the fifth aspect, the rigidity of the second high-rigidity portion in the main body portion can be easily made higher than the rigidity of the easily deformable portion.

The sealing material of the sixth aspect is the sealing material of the fifth aspect, in which the second high-rigidity portion of the main body portion is curved so as to bulge toward the side opposite to the curvature center side of the flexure. ..

In the sealing material of the sixth aspect, the second high-rigidity portion in the main body portion is curved so as to bulge toward the side opposite to the curvature center side of the flexure, whereby the second high-rigidity portion in the main body portion is curved. The wall thickness is gradually set to be thicker than the wall thickness of the easily deformed portion. Therefore, the rigidity of the second high-rigidity portion in the main body portion can be easily made higher than the rigidity of the easily deformable portion.

The sealing material of the seventh aspect is the sealing material of any one of the first to sixth aspects, and the easily deformable portion is constricted inward in the thickness direction of the main body portion.

In the sealing material of the seventh aspect, since the easily deformed portion is constricted inward in the thickness direction of the main body portion, bending deformation in the axial direction with the longitudinal direction of the main body portion as the axial direction is likely to occur in the easily deformed portion. Become. As a result, bending deformation can be induced in the easily deformed portion in the flexed state of the main body portion.

The sealing material according to the eighth aspect is the sealing material according to any one of the first to seventh aspects, wherein the easily deformable portions are provided on both sides in the thickness direction of the main body portion. At the intermediate portion in the width direction of the main body portion, the easily deformable portions on both sides in the thickness direction of the main body portion are continuously or intermittently connected in the longitudinal direction of the main body portion.

In the sealing material of the eighth aspect, easily deformable portions are provided on both sides of the main body portion in the thickness direction. Further, the easily deformable portion on one side in the thickness direction of the main body and the easily deformable portion on the other side in the thickness direction of the main body are continuous in the longitudinal direction of the main body at the intermediate portion in the width direction of the main body. Or it is connected intermittently. In such a configuration, when the main body is bent in the axial direction with the thickness direction of the main body as the axial direction, the portion connecting the easily deformed parts has the longitudinal direction of the main body as the axial direction. By bending in the axial direction, it is possible to induce bending deformation in the axial direction with the longitudinal direction of the main body as the axial direction in the easily deformed portion.

In the sealing material of the eighth aspect, the sealing material of the ninth aspect is the main body on the side opposite to the center of curvature of the flexure from the portion where the easily deformable portions are connected on both sides in the thickness direction of the main body portion. It is provided inside the portion and includes a core material that can be flexed in the longitudinal direction of the main body portion.

According to the sealing material of the ninth aspect, a core material that is flexible with respect to the longitudinal direction of the main body portion is arranged inside the main body portion. Here, the core material is provided on the side opposite to the center of curvature of the flexure from the portion where the easily deformable portions on both sides in the thickness direction of the main body portion are connected. When the main body is flexed, the core material is flexed together with the main body. As the core material is flexed in this way, the portion where the easily deformable portions on both sides of the main body portion in the thickness direction are connected is pressed by the core material toward the center of curvature of the flexure of the main body portion. As a result, when the portion where the easily deformable parts on both sides in the thickness direction of the main body is connected bends in the axial direction with the longitudinal direction of the main body as the axial direction, the longitudinal direction of the main body becomes the axial direction in both easily deformed parts. Bending deformation in the axial direction is induced.

The sealing material of the tenth aspect is provided inside the main body portion in the sealing material of any one aspect from the first aspect to the ninth aspect, and can be flexed with respect to the longitudinal direction of the main body portion. Equipped with a solid core material.

In the sealing material of the tenth aspect, a core material that is flexible with respect to the longitudinal direction of the main body portion is provided inside the main body portion. This core material can suppress the occurrence of inadvertent flexure in the non-flexible part of the main body, and as a result, even if the main body is locally flexed, wrinkles are formed on the center side of the curvature of the flexure in the main body. Can be suppressed. This facilitates the application of the sealing material to the corners and the like.

The sealing material of the eleventh aspect is the sealing material of the ninth aspect or the tenth aspect, and the core material is a foam having open cells.

In the sealing material of the eleventh aspect, the core material is a foam having open cells. Here, the foam having open cells can be easily compressed and deformed as compared with, for example, a foam having closed cells.

As described above, the sealing material according to the present invention can suppress the occurrence of long wrinkles in the direction of the central axis of curvature of bending when the sealing material is bent.

It is a perspective view of the straightened state of the sealing material which concerns on 1st Embodiment. It is sectional drawing which cut along the line 2-2 of FIG. It is a perspective view of the state in which the sealing material which concerns on 1st Embodiment is bent in the direction which intersects with respect to a longitudinal direction. It is sectional drawing which cut along the 4-4 line of FIG. It is a photograph of a conventional rod-shaped sealing material in a bent state. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 2nd Embodiment. It is sectional drawing corresponding to FIG. 4 of the sealing material which concerns on 2nd Embodiment. It is a perspective view of the straightened state of the sealing material which concerns on 3rd Embodiment. It is a photograph of the actual straightened state corresponding to the sealing material according to the third embodiment. It is sectional drawing cut along the line 10-10 of FIG. It is a perspective view of the state in which the sealing material which concerns on 3rd Embodiment is flexed in the direction which intersects with the longitudinal direction. It is a photograph which shows the state which the real thing corresponding to the sealing material which concerns on 3rd Embodiment is flexed in the direction which intersects with the longitudinal direction. It is sectional drawing cut along the line 13-13 of FIG. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 4th Embodiment. It is sectional drawing corresponding to FIG. 4 of the sealing material which concerns on 4th Embodiment. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 5th Embodiment. It is sectional drawing corresponding to FIG. 4 of the sealing material which concerns on 5th Embodiment. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 6th Embodiment. It is sectional drawing corresponding to FIG. 4 of the sealing material which concerns on 6th Embodiment. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 7th Embodiment. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 8th Embodiment. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on 9th Embodiment. It is sectional drawing corresponding to FIG. 2 of the sealing material which concerns on tenth embodiment.

Next, each embodiment of the present invention will be described with reference to the respective figures of FIGS. 1 to 19. The arrow L appropriately shown in each figure indicates one side of the sealing material 10 in the longitudinal direction, and the arrow W indicates the one side of the sealing material 10 in the width direction and the center of curvature of the sealing material 10 in a bent state. Show the side. Further, the arrow T indicates the thickness direction of the sealing material 10.

In explaining each of the following embodiments, parts that are basically the same as those of the above-described embodiment are given the same reference numerals and detailed description thereof will be given. Omit.

<Structure of the first embodiment>
As shown in FIG. 1, the sealing material 10 includes a main body portion 12. The main body 12 is formed in a long shape by a thermoplastic synthetic resin material (for example, a soft thermoplastic resin) or a thermosetting synthetic resin material (for example, a thermosetting elastomer). The main body 12 formed of such a synthetic resin material is formed, for example, by extrusion molding with an extruder.

Further, as a synthetic resin material suitable for the main body 12, from the viewpoint of improving various characteristics such as water stopping property, airtightness, moisture permeation resistance, sound insulation, weather resistance, mechanical strength, repeatability, and slidability, the synthetic resin material is suitable. It is preferably a soft thermoplastic resin having a Shore D hardness of 40 or less. Examples of synthetic resin materials suitable for the main body 12 include polyethylene, polyethylene-based copolymers, soft polyvinyl chlorides, various thermoplastic elastomers, soft ester-based resins, soft polyamide-based resins, and soft polypropylene-based resins. Particularly preferred are polyethylene, polyethylene-based copolymers (polyethylene vinyl acetate, polyethylene acrylic copolymer, etc.), soft polyvinyl chloride, and thermoplastic elastomers.

Further, as the soft thermoplastic resin forming the main body 12, a hot melt type resin such as olefin-based, nylon-based, polyester-based, polyurethane-based, styrene-butadiene rubber-based, or styrene-isoprene-based resin may be further applied. Good. In addition, among these hot melt type resins, a resin corresponding to a thermosetting elastomer described later in which an isocyanato group is reactively crosslinked with moisture in the air, such as a polyurethane type, may be used. In this case, heat is used. The plastic elastomer has a shore A hardness of 80 or less, more preferably 60 or less.

The above-mentioned method for measuring the Shore D hardness is, for example, a durometer hardness using a type D durometer based on JIS 6253-3 (2012) or a rubber-pocket type hardness test method of ISO48-4. In the test, the value 15 seconds after the sample is pressed is measured as the shore D hardness.

The shore A hardness is measured by, for example, a durometer hardness test using a type A durometer based on JIS 6253-3 (2012) or ISO48-4 rubber-pocket type hardness test method. , The value 15 seconds after the sample is pressed is measured as the shore A hardness.

Examples of the thermoplastic elastomer forming the main body 12 include vinyl chloride-based thermoplastic elastomer, olefin-based thermoplastic elastomer, styrene-based thermoplastic elastomer, urethane-based thermoplastic elastomer, amide-based thermoplastic elastomer, and ester-based thermoplastic elastomer. , Various thermoplastic elastomers such as acrylic thermoplastic elastomers.

Among these, the thermoplastic elastomer forming the main body 12 is selected from vinyl chloride-based thermoplastic elastomer, olefin-based thermoplastic elastomer, styrene-based thermoplastic elastomer, urethane-based thermoplastic elastomer, and acrylic-based thermoplastic elastomer. It is preferable that it is at least one kind.

The vinyl chloride-based thermoplastic elastomer forming the main body 12 is an elastomer having at least a polymer obtained by polymerizing vinyl chloride. Examples of the vinyl chloride-based thermoplastic elastomer include a blend-type elastomer in which polyvinyl chloride and nitrile rubber (NBR) are mixed, a blend-type elastomer in which polyvinyl chloride or nitrile rubber is partially crosslinked, and the like.

The olefin-based thermoplastic elastomer forming the main body 12 is an elastomer having at least a polymer obtained by polymerizing an olefin. Examples thereof include a blend type elastomer of an olefin rubber and a polyolefin resin, a partially crosslinked blend type elastomer in which an olefin rubber and a polyolefin resin are partially crosslinked, a completely crosslinked blend type elastomer of ethylene propylene diene rubber (EPDM) and polypropylene, and the like. ..

The styrene-based thermoplastic elastomer forming the main body 12 is an elastomer having at least a polymer obtained by polymerizing styrene. Polystyrene-Isoprene-Polystyrene (SIS) block structure elastomer, polystyrene-poly (ethylene-butylene) -polystyrene (SEBS) block structure elastomer, polystyrene-polybutadiene-polystyrene (SBS) block structure elastomer, polystyrene-poly (ethylene-) Examples thereof include elastomers having a propylene) -polystyrene (SEPS) block structure.

The urethane-based thermoplastic elastomer forming the main body 12 is an elastomer having at least a polymer having a urethane structure. Examples thereof include a block-structured elastomer of polyester and polyurethane, a block-structured elastomer of polyether and polyurethane, and the like. Examples of the acrylic thermoplastic elastomer forming the main body 12 include a block copolymer of polymethyl methacrylate and an acrylic acid ester.

Examples of the thermosetting elastomer for forming the main body 12 include silicone rubber, fluororubber, acrylic rubber, EPDM rubber, butyl rubber, urethane rubber, and fluororubber.

In particular, a room temperature curable thermosetting elastomer is preferable because it can be cured at a low temperature and has high productivity. Examples of the room temperature curable thermocurable elastomer include moisture curable rubber (for example, silicone rubber, modified silicone rubber, polyurethane rubber, polysulfide rubber, etc.). Further, examples of the room temperature curable thermocurable elastomer include two-component curable rubber (for example, silicone rubber, modified silicone rubber, polyurethane rubber, acrylic urethane rubber, polysulfide rubber, fluororubber, etc.). In particular, as the thermosetting elastomer, silicone rubber, modified silicone rubber, and fluororubber are suitable. Although these elastomers are very soft, they have excellent heat resistance, weather resistance, electrical properties, and flame retardancy.

The shore A hardness of the thermosetting elastomer (shore A hardness after curing) is also preferably 0 to 85, more preferably 0 to 50. When the hardness is within the above range, the main body 12 is soft and has good adhesion to the contact surface with the material to be sealed (for example, the water-stopping surface), so that various characteristics (water-stopping, airtightness, moisture permeability, sound insulation, etc.) Is easier to maintain.

The soft thermoplastic resin or thermosetting elastomer (that is, the main body 12) may contain various additives. For example, when a flame retardant is applied as an additive, flame retardancy can be imparted to the foam sealing material. Further, when a colorant is applied as an additive, it becomes a foamed sealing material having a main body portion 12 colored in a target color, and the designability is improved.

The thickness of the main body 12 is preferably 10 μm to 10 mm from the viewpoint of improving various characteristics such as water stoppage, airtightness, moisture permeability, sound insulation, weather resistance, mechanical strength, repeatability, and slidability. More preferably, it is 50 μm to 10 mm.

A hollow portion 14 is formed in the above main body portion 12. The hollow portion 14 is continuously formed in the main body portion 12 in the longitudinal direction of the sealing material 10 (the direction indicated by the arrow L in FIG. 1 and the opposite direction). Therefore, the main body portion 12 is formed on the other side in the width direction of the sealing material 10. It opens toward (the side opposite to the arrow W in FIG. 1).

As shown in FIGS. 1 and 2, the main body portion 12 includes a first thick portion 16 as a first high-rigidity portion. The first thick portion 16 is set on one side in the width direction of the sealing material 10 (the side in the arrow W direction of FIGS. 1 and 2), and as shown in FIG. 3, when the sealing material 10 is bent. It is set on the center side of the curvature of bending. As shown in FIG. 2, the cross-sectional shape of the first thick portion 16 when the main body portion 12 is cut in the direction orthogonal to the longitudinal direction of the sealing material 10 is the sealing material 10 in the first thick portion 16. The thickness of the main body 12 is gradually reduced from the substantially central portion to both sides of the sealing material 10 in the first thick portion 16 in the thickness direction (the direction indicated by the arrow T in FIG. 2 and the opposite direction). ..

In the first thick-walled portion 16, the outer peripheral shape of the main body portion 12 (the shape of one side of the sealing material 10 in the first thick-walled portion 16 in the width direction) is the width direction of the main body portion 12 (arrow W direction in FIG. 2). ) Is curved so as to bulge toward the side. Further, the inner peripheral shape of the hollow portion 14 corresponding to the first thick portion 16 is curved so as to be recessed toward one side in the width direction of the main body portion 12.

Further, as shown in FIGS. 1 and 2, each of the main body portions 12 includes a pair of thin- walled portions 20 and 21 as easily deformable portions. The pair of thin- walled portions 20 and 21 are formed at positions facing each other between the first thick-walled portion 16 and the other in the width direction (directions opposite to the arrows W in FIGS. 1 and 2).

The thickness dimensions of these thin- walled portions 20 and 21 are set to be thinner than the thickest portion in the first thick-walled portion 16. In particular, in the present embodiment, the thickness dimensions of the thin portion 20 and 21 are set to be equal to or less than the thickness dimension of the thinnest portion in the first thick portion 16. Therefore, the rigidity of the main body portion 12 in each of the thin- walled portions 20 and 21 is lower than the rigidity of the first thick-walled portion 16.

As shown in FIGS. 1 and 2, the core material 22 may be arranged inside the hollow portion 14 of the main body portion 12 having the above configuration. Further, the outer peripheral portion of the core material 22 and the inner peripheral portion of the hollow portion 14 may be partially or wholly separated from each other or may be in close contact with each other. The core material 22 is preferably formed of, for example, a closed cell or open cell structure type foam that is soft at room temperature. In particular, in the case of being formed of an open cell structure type foam, when a compressive load is applied to the core material 22, the core material 22 is elastically deformed, and the application of the compressive load to the core material 22 is eliminated. It is preferable because it is restored by its own elasticity.

More specifically, the core material 22 is preferably formed of a thermosetting foam. The thermosetting type shows the property that it does not melt even when heated because the resin is crosslinked. If the core material 22 is thermoplastic, the compressive restoration property at the time of heat is poor, while if the core material 22 is a thermosetting type, it is difficult to be heat-softened or heat-shrinked, so that the range of temperature setting at the time of extrusion coating is widened.

Examples of the synthetic resin material forming the core material 22 include closed-cell or open-cell foams such as polyurethane foams, acrylic foams, rubber foams, silicone foams, olefin foams, and melamine foams. it can.

However, when a thermosetting elastomer that requires high-temperature curing is extruded after coating to form the core material 22, rubber foams and olefin foams tend to shrink due to high-temperature curing of the thermosetting elastomer. Therefore, in this case, it is preferable to apply a polyurethane foam, an acrylic foam, a silicone foam, or a melamine foam. Among these, polyurethane foam is suitable because it can be suitably applied to both soft thermoplastic resins and thermosetting elastomers, the degree of continuous foaming and the degree of flexibility can be easily changed, and the stability is extremely good. Foam.

The core material 22 preferably has water repellency, but from the viewpoint of this water repellency, the synthetic resin material forming the core material 22 includes a silicone foam, a rubber foam, and an olefin foam itself. Is water repellent, and the polyurethane foam can be made water repellent by adjusting the composition, which is preferable.

If the main body 12 is extruded by an extruder while covering the core material 22, the core material 22 is introduced into the extruder, extruded and coated with a soft thermoplastic resin or a thermosetting elastomer, and then drawn out. .. Then, the main body portion 12 in which the core material 22 is extruded and coated, that is, the sealing material 10, is heated if necessary, cooled, and then wound up or cut into a fixed length.

The core material 22 has a long shape that is long in the longitudinal direction of the sealing material 10. The cross-sectional shape of the core material 22 cut in a direction orthogonal to the longitudinal direction of the sealing material 10 is substantially rectangular. The core material 22 is continuously arranged in the longitudinal direction of the sealing material 10 inside the hollow portion 14 of the main body portion 12.

The cross-sectional shape of the core material 22 cut in the direction orthogonal to the longitudinal direction of the core material 22 does not have to be rectangular. For example, the cross-sectional shape of the core material 22 may be another polygonal shape (triangular shape, hexagonal shape, star shape, etc.), circular shape, elliptical shape, kamaboko shape, semicircular shape, shape having a recessed portion, or the like. The cross-sectional shape of the core material 22 is not particularly limited, and various shapes can be applied.

<Action and effect of the first embodiment>
The sealing material 10 is arranged at a construction site where sealing against water or the like is required along the thickness direction of the sealing material 10. By the way, for example, when the construction portion (arrangement portion) of the sealing material 10 is rectangular when viewed in the thickness direction of the sealing material 10, the sealing material 10 is bent following the corner portion of the construction portion.

When the sealing material 10 is bent (flexured) following the corners of the construction site, the first thick portion 16 of the main body portion 12 of the sealing material 10 is on the curvature center side of the bending (flexure) of the sealing material 10. The sealing material 10 is bent so as to be arranged in (see FIG. 3). When the sealing material 10 is bent in this way, the main body portion 12 is compressed in the longitudinal direction (bending circumferential direction) of the sealing material 10 on the first thick wall portion 16 side (curvature center side of bending) in the main body portion 12. To. On the other hand, when the sealing material 10 is bent as described above, the portion of the main body 12 opposite to the first thick portion 16 in the thin portions 20 and 21 (that is, the main body in the thin portions 20 and 21). The main body portion 12 is pulled in the longitudinal direction (circumferential direction of bending) of the sealing material 10 (the portion on the other side in the width direction of the portion 12).

Due to such compression and tension, the first thick portion 16 side of the main body portion 12 tries to be deformed so as to shrink in the longitudinal direction of the sealing material 10, and the first thick wall portions 20 and 21 of the main body portion 12 have the first thick wall portion 20 and 21. On the side opposite to the portion 16, the sealing material 10 is deformed so as to extend in the longitudinal direction. As shown in the photograph of FIG. 5, when a conventional rod-shaped sealing material is bent (flexured) in a direction intersecting the longitudinal direction thereof, the sealing material is sealed by compression and tension as described above. Long "wrinkles" are formed in the thickness direction of the material.

Here, the wall thickness of the first thick portion 16 of the main body portion 12 of the sealing material 10 is thicker than the wall thickness of each of the thin wall portions 20 and 21. Therefore, the rigidity of the first thick portion 16 is higher than the rigidity of each of the two thin portions 20 and 21.

Therefore, when the sealing material 10 is bent as described above, as shown in FIG. 4, the thin-walled portion 20 is deformed so as to bend at the first curved portion 24A, and the thin-walled portion 21 is deformed at the first curved portion 24B. It is transformed to bend. The first curved portions 24A and 24B are portions in which both thin-walled portions 20 are bent in the longitudinal direction of the sealing material 10, that is, in the axial direction with the circumferential direction of bending of the sealing material 10 as the axial direction. The first curved portion 24A is generated, for example, on the first thick portion 16 side (that is, the bending curvature center side of the sealing material 10) with respect to the center in the width direction of the sealing material 10 in the thin wall portion 20. Further, the first curved portion 24B is generated, for example, on the first thick portion 16 side (that is, the bending curvature center side of the sealing material 10) with respect to the center in the width direction of the sealing material 10 in the thin wall portion 21.

When both thin- walled portions 20 and 21 are bent at the first curved portions 24A and 24B, the portion of the first thick-walled portion 16 located on the most bending curvature center side and the width direction of the sealing material 10 at both thin- walled portions 20 and 21. The dimension along the width direction of the sealing material 10 with the other end is shorter than that before the deformation of both the thin- walled portions 20 and 21 in the first curved portions 24A and 24B.

Here, the compression on the bending curvature center side of the main body 12 and the pulling on the opposite side of the bending curvature center of the main body 12 that occur when the sealing material 10 is bent as described above are defined as The smaller the substantial width dimension of the main body 12, the smaller the size. Therefore, as shown in FIG. 4, both thin- walled portions 20 and 21 are bent at the first curved portions 24A and 24B as described above, and the substantially width dimension of the main body portion 12 is reduced, so that FIG. 3 shows. As shown, it is possible to suppress the occurrence of long "wrinkles" in the thickness direction of the sealing material 10.

Further, in the present embodiment, the main body portion 12 is formed of a single material. Therefore, for example, the main body portion 12 can be formed by extrusion molding. In such extrusion molding, by molding the core material 22 so as to be covered by the main body portion 12, it is not necessary to insert the core material 22 into the hollow portion 14 of the main body portion 12 separately from the molding step of the main body portion 12. become.

Further, in the present embodiment, the core material 22 formed of the foam having closed cells or open cells may be provided inside the hollow portion 14 of the main body portion 12. In this case, the sealing property improved by the main body 12 can be further improved. That is, by providing the core material 22, the sealing property is improved by the reaction force. Further, when the core material 22 is a foam having open cells, the reaction force of the sealing material is low and the resilience is good, so that the sealing material is excellent.

Further, even if the sealing material 10 is bent as described above, the formation of wrinkles at the portion on the center side of the curvature of the bending in the main body portion 12 can be suppressed, and as a result, the high sealing property as described above can be obtained. Here, no special tool or device is required for bending the sealing material 10 as described above. The work of bending the sealing material 10 does not require skill. Therefore, the sealing material 10 can be easily installed and the installation cost can be reduced.

Further, the sealing material 10 is long, and when the sealing material 10 is applied to the construction site, the sealing material 10 is cut according to the circumferential length of the construction site. Therefore, there is little waste of the sealing material 10, and the sealing material 10 can be easily applied to construction sites having different lengths in the circumferential direction.

Moreover, the annular sealing material (for example, the so-called "O-ring") according to the construction site is formed by punching, for example, a flat plate-shaped synthetic resin material. Such a sealing material. Then, punching loss (a part that does not become a sealing material) occurs, so that the manufacturing cost is high. On the other hand, in the present embodiment, since the main body 12 of the sealing material 10 is formed into a long shape by extrusion molding, for example, there is little loss in manufacturing and it can be realized at a low cost. is there.

Further, the core material 22 provided inside the hollow portion 14 of the main body portion 12 is preferably formed of a foam having open cells. Therefore, the core material 22 is deformed with a relatively low load, and has relatively high resilience. Therefore, it is easy to apply the sealing material 10 to the construction site, and the sealing property of the construction site can be maintained even in the construction site where the sealing portion of the switchboard or the like is repeatedly opened and closed.

Further, when the main body 12 of the sealing material 10 is molded, the main body 12 can be easily colored to a desired color by adding a colorant to the synthetic resin material constituting the main body 12. Therefore, for example, when the construction site of the sealing material 10 is exposed to the outside, the design of the construction site after the sealing material 10 is constructed can be improved.

<Second embodiment>
As shown in FIG. 6, in the second embodiment, the width direction of the sealing material 10 is opposite to the width direction intermediate portion of the sealing material 10 in the thin portion 20 of the main body portion 12 (opposite to the arrow W in FIG. 6). The portion on the (direction) side is curved toward the other side (direction opposite to the arrow T in FIG. 6) in the thickness direction of the sealing material 10. Further, in the present embodiment, the portion of the thin portion 21 of the main body portion 12 on the other side in the width direction of the sealing material 10 than the intermediate portion in the width direction of the sealing material 10 is one of the thickness directions of the sealing material 10 (FIG. 6). It is curved toward the arrow T direction).

The other end of the sealing material 10 in the thin-walled portion 20 in the width direction and the other end of the sealing material 10 in the thin-walled portion 21 in the width direction are connected to each other. Therefore, in the present embodiment, the other side in the width direction of the sealing material 10 in the hollow portion 14 (the direction opposite to the arrow W in FIG. 6) is the other side in the width direction of the sealing material 10 in the thin portions 20 and 21. It is closed by a part.

Further, the portion of the thin- walled portions 20 and 21 on the other side in the width direction of the sealing material 10 bulges toward the other side in the width direction of the sealing material 10 and opens toward one side in the width direction of the sealing material 10. It is curved to.

In such an embodiment, when the sealing material 10 is bent (bent) with the first thick portion 16 side as the center of curvature side in the width direction of the sealing material 10, as shown in FIG. The first curved portion 24A is formed in the portion of the thin-walled portion 20 on which the high stress acts, and the first curved portion 24B is formed in the portion of the thin-walled portion 21 on which the high stress acts.

In this way, when the thin- walled portions 20 and 21 are bent at the first curved portions 24A and 24B, the first curved portion 24A is formed at the thin- walled portions 20 and 21 in the state before the sealing material 10 is flexed (the state shown in FIG. 6). , The portion of the sealing material 10 on the other side in the width direction of 24B is moved to the one side in the width direction of the sealing material 10. As a result, the widthwise dimension of the sealing material 10 in the main body 12 becomes shorter than that before the bending of the sealing material 10. Therefore, the present embodiment basically exerts the same operation as that of the first embodiment, and the same effect can be obtained.

<Structure of the third embodiment>
As shown in FIG. 9, which is a photograph of the actual sealing material 10 shown in FIGS. 8 and 8, the main body portion 12 of the sealing material 10 is a second thick portion 18 as a second high-rigidity portion. It has. As shown in FIGS. 8 and 10, the second thick portion 18 is set on the other side in the width direction of the sealing material 10 (in the direction opposite to the arrow W in FIGS. 8 and 10), and the sealing material is formed. It is set on the side opposite to the center of curvature of bending when bending 10.

As shown in FIG. 10, the cross-sectional shape of the second thick portion 18 when the main body portion 12 is cut in the direction orthogonal to the longitudinal direction of the sealing material 10 is the sealing material 10 in the second thick portion 18. The thickness of the main body 12 is gradually reduced from the substantially central portion to both sides of the sealing material 10 in the second thick portion 18 in the thickness direction (arrow T direction in FIG. 10 and the opposite direction). ..

In the second thick portion 18, the outer peripheral shape (the shape of the sealing material 10 on the other side in the width direction of the second thick portion 18) is the other in the width direction of the main body 12 (the direction opposite to the arrow W in FIG. 10). It is curved so that it bulges toward the side of. Further, the inner peripheral shape of the hollow portion 14 corresponding to the second thick portion 18 is curved so as to be recessed toward the other side in the width direction of the main body portion 12.

Further, the maximum dimension of the second thick portion 18 along the thickness direction of the sealing material 10 (the direction indicated by the arrow T in FIG. 10 and the opposite direction) is the first thick portion along the thickness direction of the sealing material 10. It is shorter than the maximum dimension of 16. Further, the second thick portion 18 is arranged closer to the center of the sealing material 10 in the thickness direction than the first thick portion 16. Therefore, the portion of the second thick portion 18 located on the outermost side of the sealing material 10 in the thickness direction is the sealing material 10 more than the portion of the first thick portion 16 located on the outermost side of the sealing material 10 in the thickness direction. It is located on the central side in the thickness direction of.

By providing the second thick portion 18 in the main body portion 12 of the sealing material 10 in this way, the other end in the width direction of the sealing material 10 in the hollow portion 14 of the main body portion 12 is closed by the second thick portion 18. There is. Therefore, the main body portion 12 has a tubular shape. A part or all of the outer peripheral portion of the core material 22 arranged inside the hollow portion 14 and a part or all of the inner peripheral portion of the hollow portion 14 may be separated from each other and may be in close contact with each other. You may be doing it.

Further, as shown in FIGS. 8 and 10, in the present embodiment, the pair of thin- walled portions 20 and 21 seals between the first thick-walled portion 16 and the second thick-walled portion 18 in the main body portion 12. It is provided at a position facing each other in the thickness direction of the material 10. The thin portions 20 and 21 are bent inward in the thickness direction of the sealing material 10 on the center side in the width direction of the sealing material 10. Therefore, the main body portion 12 has a shape constricted inward in the thickness of the sealing material 10 on the central side in the width direction of the sealing material 10.

Therefore, when the main body 12 is cut in a direction orthogonal to the longitudinal direction of the sealing material 10, the cross-sectional shape of the outer peripheral portion of the main body 12 and the inner peripheral portion of the hollow portion 14 is the sealing material 10 in the main body 12. The central side in the width direction of the main body 12 is a "gourd shape" that is constricted so as to be recessed toward the central side in the thickness direction of the sealing material 10.

Further, the thickness dimensions of these thin- walled portions 20 and 21 are set to be thinner than the thickest portion in the second thick-walled portion 18. In particular, in the present embodiment, the thickness dimensions of the thin- walled portions 20 and 21 are set to be equal to or less than the thickness dimension of the thinnest portion of the second thick-walled portion 18. Therefore, the rigidity of the main body portion 12 in each of the thin- walled portions 20 and 21 is lower than the rigidity of each of the second thick-walled portions 18.

<Action and effect of the third embodiment>
The sealing material 10 is arranged at a construction site where sealing against water or the like is required along the thickness direction of the sealing material 10. By the way, for example, when the construction portion (arrangement portion) of the sealing material 10 is rectangular when viewed in the thickness direction of the sealing material 10, the sealing material 10 is bent following the corner portion of the construction portion.

When the sealing material 10 is bent (bent) following the corners of the construction site, the first thick portion 16 of the main body portion 12 of the sealing material 10 is on the center side of the curvature of the bending (bending) of the sealing material 10. The sealing material 10 is bent so that the second thick portion 18 is arranged on the side opposite to the bending curvature center of the sealing material 10 (see FIG. 11). When the sealing material 10 is bent in this way, the main body portion 12 is compressed in the longitudinal direction (bending circumferential direction) of the sealing material 10 on the first thick wall portion 16 side (curvature center side of bending) in the main body portion 12. To. On the other hand, when the sealing material 10 is bent as described above, on the second thick portion 18 side of the main body portion 12 (the side opposite to the center of curvature of bending), the main body portion 12 is in the longitudinal direction of the sealing material 10. It is pulled in the (circumferential direction of bending).

Due to such compression and tension, the first thick portion 16 side of the main body portion 12 tries to be deformed so as to shrink in the longitudinal direction of the sealing material 10, and the sealing material 16 side of the main body portion 12 has a first thick wall portion 16. Attempts to deform so as to extend in the longitudinal direction of 10. As shown in the photograph of FIG. 5, when a conventional rod-shaped sealing material is bent (flexured) in a direction intersecting the longitudinal direction thereof, the sealing material is sealed by compression and tension as described above. Long "wrinkles" are formed in the thickness direction of the material 10.

Here, the wall thickness of the first thick portion 16 of the main body portion 12 of the sealing material 10 is thicker than the wall thickness of each of the thin wall portions 20 and 21. Therefore, the rigidity of the first thick portion 16 is higher than the rigidity of each of the two thin portions 20 and 21.

Therefore, when the sealing material 10 is bent as described above, as shown in FIG. 13, the thin-walled portion 20 is deformed so as to be bent at the first curved portion 24A and the second curved portion 26A, and the thin-walled portion 21 is deformed. It is deformed so as to bend at the first music portion 24B and the second music portion 26B. The first curved portions 24A and 24B are portions in which both thin- walled portions 20 and 21 are bent in the longitudinal direction of the sealing material 10, that is, in the axial direction with the circumferential direction of bending of the sealing material 10 as the axial direction.

The first curved portion 24A is generated, for example, on the first thick portion 16 side (that is, the bending curvature center side of the sealing material 10) with respect to the center in the width direction of the sealing material 10 in the thin wall portion 20. Further, the first curved portion 24B is generated, for example, on the first thick portion 16 side (that is, the bending curvature center side of the sealing material 10) with respect to the center in the width direction of the sealing material 10 in the thin wall portion 21. On the other hand, the second curved portion 26A is, for example, on the second thick portion 18 side of the thin wall portion 20 with respect to the center in the width direction of the sealing material 10 (that is, the side opposite to the bending curvature center of the sealing material 10). Occurs in. Further, the second curved portion 26B is generated, for example, on the side of the second thick portion 18 (that is, the side opposite to the center of curvature of the bending of the sealing material 10) with respect to the center in the width direction of the sealing material 10 in the thin portion 21.

When both thin- walled portions 20 and 21 are bent at the first curved portions 24A and 24B and the second curved portions 26A and 26B, each part of both thin- walled portions 20 and 21 is a sealing material for the first thick-walled portion 16. Each of both thin-walled portions 20 is folded so as to overlap the first thick-walled portion 16 on the central side in the thickness direction of 10. When both thin-walled portions 20 are folded in this way, the substantial width dimension of the main body portion 12 is before the deformation of both thin- walled portions 20 and 21 in the first curved portions 24A and 24B and the second curved portions 26A and 26B. Will be shorter than.

Here, the compression on the bending curvature center side of the main body 12 and the pulling on the opposite side of the bending curvature center of the main body 12 that occur when the sealing material 10 is bent as described above are defined as The smaller the substantial width dimension of the main body 12, the smaller the size. Therefore, it is possible to suppress the occurrence of long "wrinkles" in the thickness direction of the sealing material 10. By suppressing the occurrence of such wrinkles, it is possible to suppress the deterioration of the sealing property at the place where the sealing material 10 is applied.

That is, this embodiment can basically obtain the same effect as that of the first embodiment.

<Fourth Embodiment>
As shown in FIG. 14, in the fourth embodiment, the dimensions of the first thick portion 16 and the second thick portion 18 of the main body portion 12 in the thickness direction are the same, and the thin portions 20 and 21 have the same dimensions. The configuration is basically the same as that of the second embodiment, except that the central portion of the sealing material 10 in the width direction has a line-symmetrical shape centered on the virtual axis extending in the thickness direction of the sealing material 10.

As shown in FIG. 15, in such a main body portion 12, when the sealing material 10 is bent, the first curved portion 24A is formed in the thin-walled portion 20, and the thin-walled portion 20 bends in the first curved portion 24A. Further, when the sealing material 10 is bent, a second curved portion 26B is formed in the thin-walled portion 21 in the main body portion 12, and the thin-walled portion 21 bends at the second curved portion 26B.

By bending the thin portion 20 and 21 in this way, the first curved portion 24A enters the first thick portion 16 on the other side in the thickness direction of the sealing material 10, and the second curved portion 26B has the second thickness. It enters one side of the sealing material 10 in the thickness direction with respect to the meat portion 18. As a result, the smaller the substantial width of the main body 12, the smaller the size. Therefore, it is possible to suppress the occurrence of long "wrinkles" in the thickness direction of the sealing material 10 on the surface of the first thick portion 16 of the main body 12 due to the bending of the sealing material 10. As a result, the third embodiment can basically obtain the same effect as that of the first embodiment.

<Fifth Embodiment>
As shown in FIG. 16, in the fifth embodiment, the thin- walled portions 20 and 21 are located at the center side in the width direction (arrow W direction of FIG. 16 and the opposite direction) of the sealing material 10 in the thin- walled portions 20 and 21. The sealing material 10 is not tied inward in the thickness direction (the direction of arrow T in FIG. 16 and the opposite direction). Therefore, each of the thin- walled portions 20 and 21 is formed substantially linearly from the end portion on the first thick-walled portion 16 side to the end portion on the second thick-walled portion 18 side.

In the present embodiment having such a configuration, as shown in FIG. 17, the sealing material 10 is bent (bent) with the first thick portion 16 side as the center of curvature in the width direction of the sealing material 10. Then, the first curved portion 24A and the second curved portion 26A are formed in the portion of the thin-walled portion 20 where a high stress acts. Further, in this state, the first curved portion 24B and the second curved portion 26B are formed in the portion of the thin-walled portion 21 on which high stress acts. Therefore, this embodiment basically exerts the same operation as that of the first embodiment, and can obtain the same effect as that of the first embodiment.

<Sixth Embodiment>
As shown in FIG. 18, in the sixth embodiment, the main body portion 12 includes a partition wall 28 as a connecting portion. The partition wall 28 is arranged in the intermediate portion of the hollow portion 14 in the width direction (arrow W direction of FIG. 19) of the sealing material 10. The partition wall 28 connects the intermediate portion in the width direction of the sealing material 10 in the thin-walled portion 20 and the intermediate portion in the width direction of the sealing material 10 in the thin-walled portion 21 inside the main body portion 12.

The partition wall 28 opens toward the other side in the width direction of the sealing material 10 (direction opposite to the arrow W in FIG. 18), and faces toward one side in the width direction of the sealing material 10 (direction arrow W in FIG. 18). It is curved to bulge. In the present embodiment, the partition wall 28 is curved as described above. However, the partition wall 28 may be curved so as to open toward one side in the width direction of the sealing material 10 and bulge toward the other side in the width direction of the sealing material 10, or the partition wall 28 is curved. It may not have a configuration.

As described above, in the present embodiment, the partition wall 28 is provided inside the hollow portion 14 of the main body portion 12. Therefore, the hollow portion 14 is formed into a first hollow portion 14A on one side in the width direction of the sealing material 10 with respect to the partition wall 28 and a second hollow portion 14B on the other side in the width direction of the sealing material 10 with respect to the partition wall 28. I know. In the present embodiment, the core material 22 may be provided in the second hollow portion 14.

In the present embodiment, the cross-sectional shape of the core material 22 when the core material 22 is cut in the longitudinal direction is substantially elliptical, and the major axis direction of the cross-sectional shape of the core material 22 is the width of the sealing material 10. It is said to be the direction. However, the cross-sectional shape of the core material 22 may be circular or rectangular, and for example, a trapezoidal shape or a tapered shape that becomes thinner toward one side in the width direction (arrow W direction in FIG. 18) of the sealing material 10. It may be. That is, the cross-sectional shape of the core material 22 is not particularly limited.

In the present embodiment having the above configuration, when the sealing material 10 is flexed with one side of the sealing material 10 in the width direction as the center of curvature, the first thick portion 16 side of the main body portion 12 of the sealing material 10 Compression occurs in the circumferential direction of the flexure, and tension occurs in the circumferential direction of the flexure on the second thick portion 18 side. As a result, when the second thick portion 18 tries to move to the curvature center side of the flexure, the core material 22 in the second hollow portion 14B of the main body portion 12 is moved to the curvature center side of the flexure by the second thick portion 18. Is pressed against.

Further, when the core material 22 is pressed by the second thick portion 18 in this way, the partition wall 28 is pressed by the core material 22 toward the center of curvature of the flexure. When the partition wall 28 is pressed by the core material 22, the partition wall 28 tends to move toward the first hollow portion 14A of the main body portion 12. As a result, the joint portion between the partition wall 28 and the thin- walled portions 20 and 21 moves toward the center of curvature of the flexure.

As a result, as shown in FIG. 19, the joint portion or the vicinity portion of the thin- walled portions 20 and 21 with the partition wall 28 becomes the second curved portion 26A and 26B, and the second curved portions 26A and 26B in the thin- walled portions 20 and 21. The portions on the side of the first thick portion 16 are the first curved portions 24A and 24B. The thin- walled portions 20 and 21 are bent and folded at the first curved portions 24A and 24B and the second curved portions 26A and 26B. As a result, it is possible to prevent the formation of "wrinkles" as described above in the first thick portion 16.

Therefore, this embodiment can basically obtain the same effect as that of the first embodiment described above. Further, in the present embodiment, bending at the thin portions 20 and 21 can be induced by the partition wall 28 as described above. Therefore, in the present embodiment, when the sealing material 10 is flexed, the thin- walled portions 20 and 21 can be easily bent, and as a result, “wrinkles” in the first thick-walled portion 16 can be generated. Can be effectively suppressed.

<7th embodiment>
As shown in FIG. 20, in the seventh embodiment, the dimensions of the main body 12 in the width direction of the sealing material 10 (in the direction of arrow W in FIG. 20 and the opposite direction) are in the thickness direction of the sealing material 10. It has a substantially oval cross-sectional shape that is sufficiently larger than the dimensions (in the direction of arrow T in FIG. 20 and in the opposite direction). In the main body portion 12, both side portions of the sealing material 10 in the thickness direction are formed in a wavy shape. A pair of thin- walled portions 20A and 20B are formed side by side in the width direction on one side of the main body 12 in the thickness direction. A pair of thin-walled portions 21A and 21B are formed side by side in the width direction on the other side portion of the main body portion 12 in the thickness direction.

In the main body portion 12 as described above, when the sealing material 10 is flexed with the first thick portion 16 side as the center of curvature in the width direction of the sealing material 10, the thin- walled portions 20A, 20B, 21A, and 21B are the main body portions. By bending inward of the main body 12 at the flexed portion of 12, the distance between the first thick portion 16 and the second thick portion 18 of the main body 12 becomes narrow. As a result, the compression on the bending curvature center side of the main body 12 and the pulling on the opposite side of the bending curvature center of the main body 12 are reduced. As a result, it is possible to suppress the formation of long "wrinkles" in the thickness direction of the sealing material 10 on the surface of the first thick portion 16 of the main body 12 due to the bending of the sealing material 10. Thereby, the seventh embodiment can basically obtain the same effect as the first embodiment.

<Eighth Embodiment>
As shown in FIG. 21, in the eighth embodiment, the main body 12 has a cross-sectional shape similar to that of the main body 12 in the seventh embodiment, but the main body 12 has a cross-sectional shape similar to that of the seventh embodiment. Instead of the pair of thin-walled portions 21A and 21B in the embodiment of 7, the sealing material 10 has a single thin-walled portion 21 extending in the width direction (direction of arrow W in FIG. 20 and the opposite direction).

In the main body portion 12 as described above, when the sealing material 10 is flexed with the first thick portion 16 side as the center of curvature in the width direction of the sealing material 10, the thin- walled portions 20A, 20B, 21 of the main body portion 12 By bending inward of the main body portion 12 at the flexure portion, the distance between the first thick portion 16 and the second thick wall portion 18 of the main body portion 12 becomes narrow. As a result, the compression on the bending curvature center side of the main body 12 and the pulling on the opposite side of the bending curvature center of the main body 12 are reduced. As a result, it is possible to suppress the formation of long "wrinkles" in the thickness direction of the sealing material 10 on the surface of the first thick portion 16 of the main body 12 due to the bending of the sealing material 10. Thereby, the eighth embodiment can basically obtain the same effect as the first embodiment.

<9th embodiment>
As shown in FIG. 22, in the ninth embodiment, the main body portion 12 has a substantially triangular cross-sectional shape. Three thin- walled portions 20A, 20B, and 21 are formed side by side in the circumferential direction on the main body portion 12. These thin- walled portions 20A, 20B, and 21 are constricted toward the center side of the cross section of the main body portion 12. A first thick-walled portion 16 is formed between the thin-walled portion 20A and the thin-walled portion 21, and a second thick-walled portion 18 is formed between the thin-walled portion 20B and the thin-walled portion 21. A third thick portion 30 is formed between the thin portion 20A and the thin portion 20B. The third thick portion 30 is located on the side opposite to the thin portion 21 via the center of the cross section of the main body portion 12, and is curved so as to be convex toward the side opposite to the thin portion 21. ..

In the main body portion 12 as described above, when the sealing material 10 is flexed with the first thick portion 16 side as the center of curvature in the width direction of the sealing material 10, the thin- walled portions 20A, 20B, 21 of the main body portion 12 By bending inward of the main body portion 12 at the flexure portion, the distance between the first thick portion 16 and the second thick wall portion 18 of the main body portion 12 becomes narrow. As a result, the compression on the bending curvature center side of the main body 12 and the pulling on the opposite side of the bending curvature center of the main body 12 are reduced. As a result, it is possible to suppress the formation of long "wrinkles" in the thickness direction of the sealing material 10 on the surface of the first thick portion 16 of the main body 12 due to the bending of the sealing material 10. Thereby, the ninth embodiment can basically obtain the same effect as the first embodiment.

<10th Embodiment>
As shown in FIG. 23, in the tenth embodiment, the main body portion 12 has a substantially quadrangular cross-sectional shape. Four thin- walled portions 20, 25, 21, and 23 are formed side by side in the circumferential direction on the main body portion 12. These thin- walled portions 20, 25, 21, and 23 are constricted toward the center of the cross section of the main body portion 12. The thin-walled portion 20 and the thin-walled portion 21 are located on opposite sides of each other via the center of the cross section of the main body portion 12, and the thin-walled portion 23 and the thin-walled portion 25 are located on the opposite sides of each other via the center of the cross section of the main body portion 12. It is located on the other side. The thin-walled portion 20 and the thin-walled portion 21 are provided between the first thick-walled portion 16 and the second thick-walled portion 18. The first thick portion 16 is divided into a first thick portion 16A and a first thick portion 16B by the thin portion 23. The first thick portion 16A and the first thick portion 16B are arranged side by side in the thickness direction of the sealing material 10 (the direction of arrow T in FIG. 20 and the opposite direction). The second thick portion 18 is divided into a second thick portion 18A and a second thick portion 18B by the thin portion 25. The second thick portion 18A and the second thick portion 18B are arranged side by side in the thickness direction.

In the main body portion 12 as described above, when the sealing material 10 is flexed with the first thick portion 16 side as the center of curvature in the width direction of the sealing material 10, the thin- walled portions 20 and 21 are flexed. By bending inward of the main body portion 12 at the portion, the distance between the first thick-walled portion 16 and the second thick-walled portion 18 of the main body portion 12 becomes narrow. As a result, the compression on the bending curvature center side of the main body 12 and the pulling on the opposite side of the bending curvature center of the main body 12 are reduced. As a result, it is possible to suppress the formation of long "wrinkles" in the thickness direction of the sealing material 10 on the surface of the first thick portion 16 of the main body 12 due to the bending of the sealing material 10. Thereby, the tenth embodiment can basically obtain the same effect as the first embodiment.

In the seventh embodiment described above, the thickness of the sealing material 10 is larger than that of the thin portions 20A, 20B, 21A, and 21B between the thin portions 20A and 20B adjacent to each other in the width direction and between the thin portions 21A and 21B. A thick portion may be set.

Further, in each of the above embodiments, a part of the outer peripheral shape of the main body portion 12 may be flattened in the longitudinal direction (that is, the width direction of the sealing material 10). As a result, it becomes easy to apply an adhesive tape or an adhesive when it is applied as a sealing material.

Further, in each of the above embodiments, the outer peripheral shape of the core material 22 is similar to the inner peripheral shape of the hollow portion 14 of the main body portion 12, but the outer peripheral shape of the core material 22 is the shape of the main body portion 12. The shape may be different from the inner peripheral shape of the hollow portion 14.

Further, in each of the above embodiments, the core material 22 is formed of a foam having open cells. However, the core material 22 may be formed of a foam having closed cells, or may be formed of a synthetic resin material other than the foam. That is, as long as the core material 22 can be bent and deformed in a direction intersecting the longitudinal direction of the sealing material 10, the material thereof is not particularly limited and can be widely applied.

Further, in each of the above embodiments, the core material 22 is continuously provided inside the hollow portion 14 of the main body portion 12 in the longitudinal direction of the sealing material 10. However, the core material 22 may be divided into a plurality of pieces in the longitudinal direction of the sealing material 10, and further, in such a configuration, the core materials 22 adjacent to each other in the longitudinal direction of the sealing material 10 may be formed. A predetermined interval may be set between them. Further, the core material 22 may not be provided inside the hollow portion 14 of the main body portion 12.

Further, in each of the above embodiments, the thickness of the first thick portion 16 and the second thick portion 18 is made thicker than the thickness of the thin portions 20 and 21, so that the first thick portion 16 and the second thick portion 16 and the second thick portion 18 are thickened. The composition of the thick portion 18 was made higher than the rigidity of the thin portions 20 and 21.

However, for example, when the main body 12 is bent (bent) in the axial direction with the thickness direction of the main body 12 in the main body 12 (the direction indicated by the arrow T in FIG. 18 and the opposite direction) as the axial direction. By burying a long wire or the like in the longitudinal direction of the main body 12 in the portion on the curvature center side of the bending (bending) or the portion opposite to the curvature center, the curvature center side of the bending (bending) in the main body 12 The rigidity of the portion or the portion opposite to the center of curvature may be higher than the rigidity of the thin portions 20 and 21. That is, the portion of the main body 12 on the side opposite to the center of curvature of the flexure (flexure) and the portion on the side opposite to the center of curvature need to have higher rigidity than the thin- walled portions 20 and 21, and are limited to specific embodiments thereof. It's not a thing.

The entire disclosure of Japanese Patent Application No. 2019-188071 filed on October 11, 2019 is incorporated herein by reference in its entirety. All documents, patent applications, and technical standards described herein are to the same extent as if the individual documents, patent applications, and technical standards were specifically and individually stated to be incorporated by reference. Incorporated herein by reference.

Claims (11)

1. A main body that can be bent in the axial direction with the thickness direction as the axial direction and has an annular cross-sectional shape perpendicular to the longitudinal direction, or a part of the annular that opens in the longitudinal direction.
   A first high-rigidity portion formed on the main body portion and which is a portion on the curvature center side of the flexure in a bent state of the main body portion.
   The main body is formed at a position deviated from the first high-rigidity portion toward the axial direction with the longitudinal direction of the main body as the axial direction, and has lower rigidity than the first high-rigidity portion. Easy deformation part and
   Sealing material with.
2. The sealing material according to claim 1, wherein the wall thickness of the first high-rigidity portion in the main body portion is set to be thicker than the wall thickness of the easily deformable portion.
3. The sealing material according to claim 2, wherein the first high-rigidity portion in the main body portion is curved so as to bulge toward the center of curvature.
4. Any one of claims 1 to 3 in which a second high-rigidity portion having higher rigidity than the easily deformable portion is formed in a portion of the main body portion opposite to the curvature center side of the flexure. Sealing material described in.
5. The sealing material according to claim 4, wherein the wall thickness of the second high-rigidity portion in the main body portion is set to be thicker than the wall thickness of the easily deformable portion.
6. The sealing material according to claim 5, wherein the second high-rigidity portion in the main body portion is curved so as to bulge toward the side opposite to the center of curvature side.
7. The sealing material according to any one of claims 1 to 6, wherein the easily deformable portion is constricted inward in the thickness direction of the main body portion.
8. The easily deformable portions are provided on both sides in the thickness direction of the main body portion, and the easily deformable portions on both sides in the thickness direction of the main body portion are provided in the intermediate portion in the width direction of the main body portion in the longitudinal direction of the main body portion. The sealing material according to any one of claims 1 to 7, which is continuously or intermittently connected to.
9. It is provided inside the main body portion on the side opposite to the center of curvature of the flexure from the portion where the easily deformable portions are connected on both sides in the thickness direction of the main body portion, and is flexed with respect to the longitudinal direction of the main body portion. The sealing material according to claim 8, further comprising a possible core material.
10. The sealing material according to any one of claims 1 to 9, which is provided inside the main body and includes a core material that is flexible with respect to the longitudinal direction of the main body.
11. The sealing material according to claim 9 or 10, wherein the core material is a foam having open cells.

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