JP4783111B2 - Vehicle seat structure - Google Patents

Description

  The present invention relates to a seat seat structure for vehicles such as railway vehicles and automobiles.

  As a structure of a seat seat of a vehicle such as a railway vehicle or an automobile, an elastic urethane foam is used as a cushion body to secure a good seating feeling, and a skin cover is attached thereon. Conventionally used. Further, since the dirt becomes prominent due to repeated seating, the skin cover needs to be periodically cleaned. For this purpose, it is necessary to attach the skin cover in a manner detachable from the cushion body. Therefore, the surface fastener male material is attached to the attachment surface of the skin cover, while the surface fastener female material is bonded and fixed to the attachment surface of the cushion body with an adhesive, and the cushion body and the female material are engaged by engagement with the male material. A method of detachably engaging the skin cover has been adopted.

  However, since the urethane foam and the surface fastener female material are bonded with an adhesive in the above prior art, it is difficult to recycle or recycle the urethane foam. Therefore, the urethane foam and the surface fastener female material are bonded together. Bonding and fixing with an agent has not been desirable from the viewpoint of global environmental protection, which has been demanded by society in recent years. In addition, bonding the two in this manner has been a factor that increases the cost because the number of steps is increased, for example, a bonding step and a step for drying the bonding step are required, and the manufacturing time is increased. In addition, since the formed adhesive layer is poor in flexibility, this has been a factor that slightly impairs the good seating feeling secured by the elasticity of the urethane foam.

  Furthermore, the urethane foam is not sufficient in both the compression recovery rate and the compression stress ratio, that is, it does not return sufficiently when compressed, and it sinks suddenly and the body shakes greatly, resulting in a stable sitting comfort. There was a problem that it could not be obtained. In addition, the urethane foam has almost no gap through which air or water vapor escapes, and the air permeability is extremely poor.

In order to solve such problems, the applicant of the present invention used a non-elastic polyester-based crimped short fiber and a specific elastic composite fiber (a thermoplastic elastomer having a melting point 40 ° C. lower than the melting point of the short fiber as a cushion body) And the thermoplastic elastomer having the thermoplastic elastomer at least exposed on the fiber surface) and three-dimensionally entangled with each other, and the elastic composite fibers are formed by thermal fusion with each other. Molded integrally in such a manner that flexible heat fixing points and flexible heat fixing points formed by heat fusion in a state where elastic composite fibers and non-elastic polyester-based crimped short fibers intersect are scattered. It has been proposed to use a molded body having a flat surface (see Patent Document 1). If such a molded body is used as a cushion body, the hook portion of the surface fastener male material of the skin cover body can be directly invaded and engaged with the surface of the cushion body without the need for the surface fastener female material. In this way, the skin cover body and the cushion body can be detachably joined, and the structure obtained by joining is excellent in sitting comfort, breathability, recyclability, and safety, and the cushion body and skin cover. It was also excellent in the engagement / dismounting operability of the body and the engagement durability.
Japanese Patent Laid-Open No. 11-42147

  Although the seat seat structure described in Patent Document 1 can provide good seating comfort, in recent years, a seat seat structure that can provide even more comfortable sitting comfort has been demanded. For example, since the hardness when the cushion body constituting the seat seat structure described in Patent Document 1 is compressed by 25% is relatively large, a comfortable sitting comfort is obtained particularly when sitting for a long time. There was a tendency to become difficult to get. In addition, the seat seat structure disclosed in Patent Document 1 has a relatively large amount of sag after long-term use, so that the seat-seat structure is excellent in durability with little sag even after long-term use. The development of was demanded.

  The present invention has been made in view of such a technical background, and provides a very comfortable seating comfort, and is excellent in durability with little sag even when used for a long period of time, and is also recyclable and safe. Another object of the present invention is to provide a vehicle seat structure for a vehicle, which is excellent in performance and is excellent in engagement / detachment operability and engagement durability between a cushion body and a skin cover body.

  In order to achieve the above object, the present invention provides the following means.

[1] a polytrimethylene terephthalate-based crimped short fiber;
It is composed of a thermoplastic elastomer having a melting point 40 ° C. lower than the melting point of the short fibers and an inelastic polyester, and the thermoplastic elastomer is at least exposed on the fiber surface, and these fibers are three-dimensional. A cushion body formed intertwined with each other,
In the structure, the first flexible heat-adhering point formed by mutual heat fusion in a state where the elastic composite fibers cross each other, and the elastic composite fibers and the polytrimethylene terephthalate-based crimped short fibers crossed each other. A cushion body having a flat surface integrally formed in a state in which the second flexible heat fixing points formed by thermal fusion of the elastic conjugate fibers in a state are scattered,
A skin cover body composed of a skin material and a surface fastener male material laminated and integrated on at least a part of one side of the skin material,
The seat cover for a vehicle, wherein the hook part of the hook-and-loop fastener male material enters and engages with the surface layer of the cushion body, so that the skin cover body and the cushion body are detachably joined. Structure.

[2] The structure for a seat of a vehicle according to the above item 1, wherein a density of a portion from the engagement surface with the surface fastener male member to a depth of 3 mm in the cushion body is 10 to 70 kg / m ³ .

[3] The vehicle seat structure according to item 1 or 2, wherein the cushion body has a density of 20 to 100 kg / m ³ .

  [4] The vehicle seat structure for a vehicle according to any one of items 1 to 3, wherein the polytrimethylene terephthalate crimped short fiber has a fineness of 3 to 30 dtex.

  [5] Any one of items 1 to 3 above, wherein at least two types of polytrimethylene terephthalate crimped short fibers having different fineness in the range of 3 to 30 dtex are used as the polytrimethylene terephthalate crimped short fibers. A structure for a seat of a vehicle described in 1.

  [6] As the polytrimethylene terephthalate-based crimped short fibers, there are a first polytrimethylene terephthalate-based crimped short fiber of 3 to 9 decitex and a second polytrimethylene terephthalate-based crimped short fiber of 9 to 20 decitex. 4. The vehicle seat structure according to any one of items 1 to 3, which is used.

  [7] The mixed ratio of the first crimped short fiber and the second crimped short fiber is the first crimped short fiber / second crimped short fiber = 30/70 to 70/30 (mass ratio). For vehicle seats.

  In the invention of [1], there is an elastic composite fiber that connects the first flexible heat fixing point, the second flexible heat fixing point, and the heat fixing point, and these form an elastic structure three-dimensionally. Since the fibers are flexibly fixed in a complex manner by these elastic forces, the heat fixing point is not broken or deteriorated even when compressed from the outside, and therefore, the compression recovery and the compression durability are excellent. Further, since the fibers are intertwined three-dimensionally and have many voids through which air and water vapor can pass, the air permeability is excellent. When the hook portion of the hook-and-loop fastener male material is inserted into the cushion body, the hook-and-loop fastener male material smoothly enters due to the presence of the air gap and returns to the original form due to the above-described excellent compression recovery property. Engaged. And since the engagement surface of a cushion body is flat, engagement can be performed smoothly. Further, in the engaged state, even if a force acts in the lateral direction, it is possible to follow the direction by the flexible heat fixing point and the elastic force of the elastic composite fiber. It does not occur. In addition, the cushion body is excellent in compression durability, and the compression recovery property does not deteriorate even if the attachment and detachment are repeated, and therefore the engagement durability is also excellent. In addition, since the adhesive is not adhered to the cushion body surface, the cushion body can be easily recycled. And since most of the constituent material of the cushion body is a polyester material, there is little generation | occurrence | production of the toxic gas at the time of a fire and it is excellent also in safety. Furthermore, since the polytrimethylene terephthalate-based crimped short fibers are used as the crimped short fibers, it is possible to obtain a very comfortable seating comfort even when sitting for a short time or for a long time, and even when used for a long time. It is small and excellent in durability.

In the invention of [2], since the density of the portion from the engagement surface with the surface fastener male member to the depth of 3 mm in the cushion body is 10 to 70 kg / m ³ , both engagement and disengagement are smoother and easier. In addition, the detachability of the skin cover body and the cushion body is further improved, and the lateral displacement of the skin cover body during engagement is further effectively prevented.

In the invention of [3], since the density of the cushion body is 20 to 100 kg / m ³ , a more optimal compression recovery rate and compression stress ratio can be obtained for the seating, and a more stable and comfortable sitting comfort is ensured. Is done.

  In the invention of [4], the polytrimethylene terephthalate-based crimped short fiber has a fineness of 3 to 30 dtex, so that engagement and disengagement can be performed more smoothly and easily, and the elasticity of the cushion body Will also improve.

  In the invention of [5], at least two types of polytrimethylene terephthalate-based crimped short fibers having different fineness in the range of 3 to 30 dtex are used as the polytrimethylene terephthalate-based crimped short fibers. A good seat structure is provided.

  In the invention of [6], as the polytrimethylene terephthalate-based crimped short fiber, the first polytrimethylene terephthalate-based crimped short fiber of 3 to 9 dtex and the second polytrimethylene terephthalate-based fiber of 9 to 20 dtex Since the shortened fiber is used, a seat seat structure that is more comfortable to sit on is provided. Moreover, even if it is used for a long time, there will be less dripping.

  In the invention of [7], since the first crimped short fiber / second crimped short fiber = 30/70 to 70/30 (mass ratio), the seating comfort can be further improved and the seat seat is very comfortable. Can provide. Furthermore, there is an advantage that the amount of sag after use for a long period of time can be further reduced and the durability can be further improved.

  The cushion body (2) constituting the vehicle seat structure (1) according to the present invention will be described with reference to the structural cross-sectional view shown in FIG.

  The cushion body (2) comprises a polytrimethylene terephthalate-based crimped short fiber (4) and an elastic composite fiber (5), and has a flat surface integrally formed with these fibers intertwined in three dimensions. It is what you have.

  The elastic conjugate fiber (5) is composed of a thermoplastic elastomer (5a) having a melting point lower by 40 ° C. or more than the melting point of the polytrimethylene terephthalate-based crimped short fiber (4), and an inelastic polyester (5b), The thermoplastic elastomer (5a) is exposed at least on the surface of the fiber (5).

  Further, in the structure of the cushion body (2), the first flexible heat fixing point (10) formed by heat fusion of the elastic conjugate fibers (5) with each other in an intersecting state, and the elastic conjugate fibers The second flexible heat fixing points (11) formed by heat fusion in a state where (5) and the polytrimethylene terephthalate-based crimped short fibers (4) are crossed are scattered.

  The flexible heat fixing points (10) and (11) are formed by heat-sealing the thermoplastic elastomer (5a), and the cushion body (2) is compressed and the heat fixing point (10). When a load is applied to (11), this thermal fixing point means a thermal fixing point that can be freely deformed along the direction of the load and can be sufficiently recovered. In the structure of the cushion body (2) of the present invention, the first flexible heat fixing point (10) and the second flexible heat fixing point (11), and further the elastic composite fiber that connects the heat fixing points. (5) exists, and these form a three-dimensional elastic structure, and the short fiber (4) is flexibly fixed by the elastic force. There is no breakage or deterioration, and therefore excellent compression recovery and compression durability. The flexible heat fixing points (10) and (11) are preferably formed in an amoeba shape. In this case, the fixing force of the fixing points is further improved, so that the compression durability is improved. Will be better.

  Moreover, when the hook part (8a) of the hook-and-loop fastener male material (8) is made to enter the surface layer of the cushion body (2), the cushion body (2) smoothly returns to the original form due to the excellent compression recovery property. Thus, the hook portion (8a) of the surface fastener male material (8) is engaged between the fibers (FIG. 3). And since the engagement surface of a cushion body (2) is flat, engagement can be performed smoothly. In the engaged state, even if a force acts in the lateral direction, it is possible to follow the direction by the elastic force of the flexible heat fixing points (10) and (11). Will not occur. Furthermore, even if the cushion body (2) has excellent compression durability and is repeatedly attached and detached, the compression recovery property is not lowered, and the fibers are fixed at the flexible heat fixing points (10) and (11). Since it does not drop off, it has excellent engagement durability. In addition, since the adhesive is not adhered to the surface of the cushion body (2), the cushion body (2) is excellent in recyclability.

  In this invention, it is preferable that the fineness of the said polytrimethylene terephthalate type | system | group crimped short fiber (4) is 3-30 decitex (dtex). Engagement and disengagement can be performed more smoothly and easily by being 3 dtex or more, and the number of second flexible heat fixing points (11) is increased by being 30 dtex or less. The elasticity of the cushion body (2) is improved. Among them, the fineness of the polytrimethylene terephthalate-based crimped short fiber (4) is more preferably 5 to 20 dtex.

  As the polytrimethylene terephthalate-based crimped short fibers (4), it is preferable to use at least two types of polytrimethylene terephthalate-based crimped short fibers having different finenesses in the range of 3 to 30 dtex. Can provide a seat seat structure that is more comfortable to sit on.

  Among them, it is particularly preferable to use a first polytrimethylene terephthalate-based crimped short fiber having 3 dtex or more and less than 9 dtex and a second polytrimethylene terephthalate-based crimped short fiber having 9 to 20 dtex. By adopting such a configuration, it is possible to provide a seat seat structure that is more comfortable to sit on. For example, 6.6 decitex polytrimethylene terephthalate crimped short fibers and 13.2 decitex polytrimethylene terephthalate crimped short fibers are mixed and used.

  The mixed ratio of the first polytrimethylene terephthalate-based crimped short fiber and the second polytrimethylene terephthalate-based crimped short fiber is: first crimped short fiber / second crimped short fiber = 30/70 to 70/30 (mass ratio) ) Is preferably set. Thereby, sitting comfort can further be improved.

  The cut length of the polytrimethylene terephthalate-based crimped short fiber (4) is preferably 20 to 100 mm. By making it 20 mm or more, the three-dimensional entanglement between the fibers becomes sufficient, and the elasticity of the cushion body (2) can be improved, and by making it 100 mm or less, the directions of the fibers do not become too aligned in parallel. Among them, the cut length of the polytrimethylene terephthalate-based crimped short fiber (4) is more preferably 35 to 90 mm.

  The constituent resin of the crimped short fiber (4) is a polytrimethylene terephthalate resin. This polytrimethylene terephthalate resin is a polyester obtained by polycondensation using terephthalic acid as a main acid component and 1,3-propanediol as a main glycol component, that is, a resin having trimethylene terephthalate units as main repeating units. The trimethylene terephthalate unit is preferably 50 mol% or more, more preferably 80 mol% or more, and particularly preferably 90 mol% or more. Other copolymer components include, for example, dicarboxylic acids such as isophthalic acid, succinic acid, adipic acid, cyclohexanedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, dimer acid, and 5-sodium sulfoisophthalic acid, and ethylene glycol, for example. 1,4-butanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, cyclohexane dimethanol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and other diols. Among these, as the constituent resin of the crimped short fibers (4), polytrimethylene terephthalate (PTT) (consisting of 100% by mole of trimethylene terephthalate units) is preferably used.

  In addition, as long as the effect of the present invention is not hindered, other crimped short fibers (such as polyethylene terephthalate crimped short fibers) can be mixed with the polytrimethylene terephthalate-based crimped short fibers (4), The crimped short fiber is preferably a polytrimethylene terephthalate-based crimped short fiber (4) alone.

  On the other hand, the elastic conjugate fiber (5) is composed of a thermoplastic elastomer (5a) and an inelastic polyester (5b). In this elastic conjugate fiber (5), it is desirable that the thermoplastic elastomer (5a) is exposed on more than half of the fiber surface. The composite ratio of the thermoplastic elastomer (5a) and the non-elastic polyester (5b) is preferably in the range of 30/70 to 70/30 by mass ratio. Examples of the composite form of the elastic composite fiber include a side-by-side type and a sheath / core type. Among them, a sheath / core type as shown in FIG. 6 is preferable.

  As the thermoplastic elastomer (5a), it is necessary to use one having a melting point lower by 40 ° C. or more than the melting point of the polytrimethylene terephthalate-based crimped short fiber (4). When the melting point of the thermoplastic elastomer (5a) is higher than the melting point of the crimped short fiber (4), the crimped short fiber (4) is simultaneously melted when the elastomer (5a) is melted, and the cushion has desired characteristics. The body (2) cannot be obtained, and if the difference between the melting points of the two is less than 40 ° C., the crimp of the polytrimethylene terephthalate-based crimped short fiber (4) occurs when the elastomer (5a) is melted.

  It does not specifically limit as a raw material of the said thermoplastic elastomer (5a), For example, a polyester-type elastomer etc. can be mentioned. Among them, it is preferable to use a polyester-based elastomer. In this case, since the same material as that constituting the short fiber (4) is used, the adhesion between the elastomer (5a) and the polytrimethylene terephthalate-based crimped short fiber (4) is improved. The durability of the second flexible heat fixing point (11), which is an intersection with the short fiber (4), can be further improved, and the compression durability of the cushion body (2) can be further improved. Can be further improved.

  Among the polyester-based elastomers, it is preferable to use polyether polyester from the viewpoint of further improving the fixing property with the polytrimethylene terephthalate-based crimped short fibers (4). Furthermore, polybutylene-based terephthalate is used as a hard segment, and polyoxyethylene is used. A block copolymer polyether polyester having butylene glycol as a soft segment is more preferable.

  On the other hand, the inelastic polyester as a constituent component of the elastic conjugate fiber (5) is not particularly limited. For example, polyethylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, polybutylene terephthalate, poly-1, Examples thereof include 4-dimethylcyclohexane terephthalate, and copolymers thereof, among which polybutylene terephthalate is more preferable.

  In addition, it is preferable that the content rate in the cushion body (2) of the said elastic composite fiber (5) shall be 10-70 mass% with respect to a cushion body mass. When the content is 10% by mass or more, the number of heat fixing points is increased, and the elastic properties such as the compression recovery rate and the compression stress ratio are improved. The content of the crimped short fiber (4) is 70% by mass or less. Since the ratio increases relatively, sufficient resilience can be secured. Especially, it is more preferable to set it as 20-50 mass%.

The density (hereinafter referred to as “engagement portion density”) of the portion from the engagement surface with the surface fastener male material (8) to the depth of 3 mm in the cushion body (2) is set to 10 to 70 kg / m ³ . Is preferred. By making it 10 kg / m ³ or more, it is possible to effectively prevent the lateral displacement of the skin cover body (3) during engagement, and by making it 70 kg / m ³ or less, both engagement and disengagement are smoother. And the attachment / detachment operability between the skin cover body (3) and the cushion body (2) can be further improved. Especially, it is more preferable that the engaging part density is set to 20 to 60 kg / m ³ .

Moreover, it is preferable that the density of the said cushion body (2) whole is 20-100 kg / m < ³ >. The compression recovery rate and the compression stress ratio are improved by setting it to 20 kg / m ³ or more, and a sufficiently stable and comfortable sitting comfort can be obtained, and sufficient elasticity is provided by being 100 kg / m ³ or less. It can be secured. Among these, the density of the entire cushion body (2) is more preferably ³⁰ to 85 kg / m ³ .

  In the above, the compression recovery rate is the ratio of the amount of energy required to compress the cushion body by 75% to the amount of energy required to recover from 75%, and the higher the compression recovery rate, the better the elasticity. It means to feel.

  The compression stress ratio is the ratio of the stress when the cushion body is compressed by 25% and the stress when the cushion body is compressed by 65%, and indicates how much the stress (repulsive force) changes according to the amount of compression. It is. If this compressive stress ratio is small, it means that the body will suddenly sink or the body will shake greatly and a stable sitting comfort cannot be obtained.

  The thickness of the cushion body (2) is usually 3 to 300 mm because its use is a structure for a seat of a vehicle, but it is preferably 10 to 200 mm in consideration of the balance of various performances.

  The cushion body (2) can be manufactured, for example, as follows. That is, the polytrimethylene terephthalate-based crimped short fiber (4) and the elastic composite fiber (5) are mixed to form a web, thereby forming the web between the elastic composite fibers (5) and the elastic composite fiber (5). And a non-elastic polyester-based crimped short fiber (4), a three-dimensional intersection is formed, which is lower than the melting point of the crimped short fiber (4) and 10 than the melting point of the thermoplastic elastomer (5a). It is manufactured by heat-treating at a temperature as high as ˜80 ° C. and heat-sealing at least a part of these fiber crossing points. Note that the manufacturing method is not particularly limited, and other manufacturing methods may be used.

  A seat seat structure (1) for a vehicle according to the present invention comprises the cushion body (2) and a skin cover body (3), and a hook portion (8a) of a surface fastener male member (8) of the cover body. The skin cover body (3) and the cushion body (2) are detachably joined by entering and engaging the surface layer of the cushion body (2) (see FIGS. 1 to 3). .

  In this invention, the skin cover body (3) is basically composed of a skin material (7) and a surface fastener male material (8) laminated and integrated on at least a part of one surface of the skin material. From the viewpoint of more reliably preventing the lateral displacement of the skin cover body (3) during engagement, it is desirable that the surface fastener male material (8) is laminated and integrated on the entire surface of one surface of the skin material (7).

  The skin material (7) is not particularly limited, and examples thereof include pile fabrics such as knit, tricot, moquette, napped knitted fabric, tufted pile fabric and the like.

  The hook-and-loop fastener male material (8) is not particularly limited. For example, a hook portion (8a) capable of exerting an engaging function such as a J hook shape, a loop shape, a mushroom shape, or a bulge shape on one surface of a base material. There are things that are erected. In particular, the hook portion (8a) preferably has a mushroom shape.

  In the above, it is preferable that a sheet-like cushion material (9) is interposed between the skin material (7) and the surface fastener male material (8) to be laminated and integrated (see FIG. 3). The seat-like cushion material (9) disperses the load caused by the seating and can prevent local concentrated load on the cushion body (2), and therefore further improve the compression durability of the cushion body (2). Can do.

  Moreover, it is preferable that the thickness of the said sheet-like cushion material (9) shall be 0.5-10 mm. By setting the thickness to 0.5 mm or more, local concentrated loads on the cushion body (2) can be sufficiently prevented, and by setting the thickness to 10 mm or less, the flexibility and curvature as the skin cover body (3) can be obtained. The skin cover body (3) obtained sufficiently can be easily applied in conformity with the shape of the bent portion or curved portion of the cushion body (2). Especially, it is more preferable that the thickness of the said sheet-like cushion material (9) shall be 1-8 mm.

  The sheet-like cushion material (9) is not particularly limited as long as it is a sheet material that exhibits a cushioning action, and for example, the cushion body (2), urethane foam, and the like can be used. The cushion body (2) is preferably used.

  The seat seat structure (1) for a vehicle according to the present invention includes not only a seat seat structure but also a backsliding structure (for example, a backsliding frame (B) as shown in FIG. 1). It is also used as a fixed).

  Moreover, as a cushion body used by this invention, the thing (refer FIG. 7) of the structure by which the cushion body (50) which consists of another structure was laminated | stacked on the lower side of the cushion body (2) which consists of the structure mentioned above, for example. You may use, or the thing (refer FIG. 8) of the structure which laminated | stacked the cushion body (50) which consists of another structure between the cushion bodies (2) and (2) which consist of the structure mentioned above was used. May be.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
A block copolymer polyether polyester elastomer having polybutylene-based terephthalate as a hard segment (40% by mass) and polyoxybutylene glycol as a soft segment (60% by mass) was obtained by heat-reacting both. Then, this elastomer was spun into a sheath and polybutylene terephthalate as a core was spun by a conventional method to obtain a 6.6 dtex elastic composite fiber (sheath / core = 50/50 (mass ratio)).

Next, 30 parts by mass of the elastic composite fiber, 35 parts by mass of a 6.6 dtex hollow cross-section polytrimethylene terephthalate (PTT) short fiber (fiber length 64 mm, 11 crimps / inch), 13.2 dtex A hollow cross-section polytrimethylene terephthalate (PTT) short fiber (fiber length: 64 mm, number of crimps: 11 pieces / inch) was blended to obtain a web.

The web was put into a mold and heat-treated at 200 ° C. for 10 minutes to obtain a rectangular parallelepiped cushioning body having a thickness of 55 mm and a density of 43 kg / m ³ (engagement portion density of 43 kg / m ³ ).

  On the other hand, a surface fastener male material having a mushroom-like hook portion was laminated and integrated on the back surface of a knit skin material to obtain a skin cover body.

  After the cushion body was fixed to the seat cushion frame (A) of the railway vehicle seat as shown in FIG. 1, the above-mentioned skin cover body was engaged and attached to the upper surface thereof to obtain a seat seat structure.

<Example 2>
The same elastic composite fiber as in Example 1 and short polytrimethylene terephthalate fiber were mixed to obtain a web. The web is packed tightly to about one third of the mold height, the web is further filled to about two thirds of the mold height, and the web is loosely filled to the top surface of the mold at 50 ° C. at 50 ° C. A three-layer structure as shown in FIG. 5, which is heat-treated for minutes and has a lowermost layer (2a) density of 100 kg / m ³ , a middle layer (2b) density of 60 kg / m ³ , and an uppermost layer (2c) density of 35 kg / m ³ A rectangular parallelepiped cushioning body having a thickness of 55 mm and a density of 60 kg / m ³ (engagement portion density of 35 kg / m ³ ) was obtained.

  On the other hand, the surface fastener male material having a mushroom-like hook portion is laminated and integrated on the back surface of the skin material made of tricot via a sheet-like cushion material having a thickness of 3 mm (the cushion body described in Example 1 and having a thickness of 3 mm). The skin cover body was obtained.

  After fixing the three-layer cushion body to a seat cushion frame of a railway vehicle seat, the skin cover body was engaged and attached to the upper surface thereof to obtain a seat seat structure.

<Example 3>
In Example 2, the density of each layer of the three-layer structure, the lowermost layer portion density 75 kg / m ^3, middle layer density 60 kg / m ^3, as the uppermost layer portion density 45 kg / m ^3, thickness 55 mm, density 60 kg / m ³ A rectangular parallelepiped cushioning body having an engagement portion density of 45 kg / m ³ was obtained.

  Next, a surface fastener male material having a mushroom-like hook portion was laminated and integrated on the back surface of the skin material made of knit via a sheet-like cushion material (made of foamed polyurethane) having a thickness of 5 mm to obtain a skin cover body.

  After fixing the three-layer cushion body to a seat cushion frame of a railway vehicle seat, the skin cover body was engaged and attached to the upper surface thereof to obtain a seat seat structure.

< Reference Example 1 >
As a web, 30 parts by mass of 6.6 dtex elastic composite fiber of Example 1 and 70 parts by mass of 13.2 dtex hollow cross section polytrimethylene terephthalate short fibers (fiber length 64 mm, crimp number 11 / inch), A seat seat structure was obtained in the same manner as in Example 1 except that a web made of cotton was used.

< Reference Example 2 >
As a web, 30 parts by mass of 6.6 dtex elastic composite fiber of Example 1 and 70 parts by mass of 6.6 dtex hollow section polytrimethylene terephthalate short fiber (fiber length 64 mm, crimp number 11 / inch), A seat seat structure was obtained in the same manner as in Example 1 except that a web made of cotton was used.

<Comparative Example 1>
As a web, 30 parts by mass of 6.6 dtex elastic composite fiber of Example 1 and 13.2 dtex hollow cross-section polyethylene terephthalate (PET) short fibers (fiber length 51 mm, number of crimps 11 / inch) 70 parts by mass A seat seat structure was obtained in the same manner as in Example 1 except that a web formed by blending and was used.

<Test method and evaluation method>
Each seat seat structure produced as described above was evaluated according to the test methods shown in the following AC. Moreover, it evaluated according to the test method shown to the following DG with respect to the cushion body which comprises each structure. The results are shown in Table 1.

A. Engagement / removal operability test method The engagement / removal operability of the skin cover body and the cushion body was determined based on the following criteria.
(Criteria)
Both engagement and disengagement can be performed smoothly and easily.
Engagement and disengagement can be performed for a while, but it is not smooth… △
Neither engagement nor disengagement can be performed ... "X".

B. Lateral deviation prevention test method The lateral deviation prevention property of the skin cover body at the time of engagement was determined based on the following criteria.
(Criteria)
Even if a person is seated and moves laterally, there is no lateral displacement ... "○"
Even if a person is seated and moves laterally, there is almost no lateral displacement ... "△"
When a person is seated and moves in the lateral direction, the lateral shift is noticeable.

C. Engagement durability test method Engagement / removal operability after 20 attachments / detachments was evaluated. Judgment criteria are test methods A. Is exactly the same.

D. Hardness test method at 25% compression Based on JIS K6400-1997, the stress when the cushion body was compressed by 25% was determined, and this was defined as the hardness at 25% compression.

E. Hysteresis loss test method By performing a 100 kg load-deflection test, a curve (graph) of load and weight is obtained, the amount of work loss is obtained from this curve graph, and this is expressed as a ratio (%). Rate (%).

F. Durability test method JIS S1052-1978 6.2.3 According to the cushioning sag test method, after the operation of dropping a 20 kg sand bag onto the cushion body 20000 times, the amount of cushion sag ( mm), hardness at 25% compression, and hysteresis loss.

G. Density Evaluation Method Based on JIS K-6400-1997, the density (kg / m ³ ) of each cushion was measured.

As is apparent from the table, the seat seat structures of Examples 1 to 3 and Reference Example 1 of the present invention are excellent in engaging / detaching operability, preventing lateral slippage, and engaging durability, and at 25% compression. The hardness is about 127 to 147 (N / 200φ), which is considered to be the most preferable (the cushion body made of a conventional urethane foam is often about 127 to 147), and the sitting comfort is very high. In addition, the hardness at 25% compression after the 20000 sand bag drop test has a value close to about 127 to 147 (N / 200φ), and a very good sitting comfort is maintained. Further, the amount of sag after the 20000 sand bag drop test was smaller than that of Comparative Example 1 and excellent in durability.

In addition, the seat seat structure of Reference Example 2 has a hardness at 25% compression of about 127 to 147 (N / 200φ), which is considered to be the most preferable, and has a very good sitting comfort. However, the hardness at the time of 25% compression after the 20000 sand bag drop test was 116 (N / 200φ), and a feeling of bottoming was slightly felt.

  On the other hand, the seat seat structure of Comparative Example 1 had good engagement / detachment operability, lateral slip prevention and engagement durability, but had a hardness of 496 (N / 200φ) at 25% compression. A great feeling of hardness was felt and an excellent sitting comfort was not obtained.

  The vehicle seat seat structure according to the present invention is suitably used as, for example, a rail vehicle seat seat structure and an automobile seat seat structure.

It is a perspective view which shows the state which mounted | wore the seat frame with the structure for seat sheets concerning one Embodiment of this invention. It is sectional drawing of the XX line in FIG. It is sectional drawing which expands and shows the engaging part vicinity in FIG. It is an expanded sectional view showing an example of the fine structure of a cushion body. It is sectional drawing which shows an example of the layer structure of a cushion body. It is a perspective view which cuts out some elastic composite fibers concerning an Example, and shows them. It is sectional drawing which shows the other example of the laminated constitution of the cushion body used by this invention. It is sectional drawing which shows the further another example of the layer structure of the cushion body used by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seat seat structure 2 ... Cushion body 3 ... Skin cover body 4 ... Polytrimethylene terephthalate crimped short fiber 5 ... Elastic composite fiber 5a ... Thermoplastic elastomer 5b ... Non-elastic polyester 7 ... Skin material 8 ... Surface fastener male material 8a ... hook part 9 ... sheet-like cushion material 10 ... first flexible heat fixing point 11 ... second flexible heat fixing point

Claims (5)

Polytrimethylene terephthalate crimped short fibers;
It is composed of a thermoplastic elastomer having a melting point 40 ° C. lower than the melting point of the short fibers and an inelastic polyester, and the thermoplastic elastomer is at least exposed on the fiber surface, and these fibers are three-dimensional. A cushion body formed intertwined with each other,
In the structure, the first flexible heat-adhering point formed by mutual heat fusion in a state where the elastic composite fibers cross each other, and the elastic composite fibers and the polytrimethylene terephthalate-based crimped short fibers crossed each other. A cushion body having a flat surface integrally formed in a state in which the second flexible heat fixing points formed by thermal fusion of the elastic conjugate fibers in a state are scattered,
A skin cover body composed of a skin material and a surface fastener male material laminated and integrated on at least a part of one side of the skin material,
As the polytrimethylene terephthalate-based crimped short fibers, at least two types of polytrimethylene terephthalate-based crimped short fibers having different fineness in the range of 3 to 30 dtex are used.
The seat cover for a vehicle, wherein the hook part of the hook-and-loop fastener male material enters and engages with the surface layer of the cushion body, so that the skin cover body and the cushion body are detachably joined. Structure. Polytrimethylene terephthalate crimped short fibers;
It is composed of a thermoplastic elastomer having a melting point 40 ° C. lower than the melting point of the short fibers and an inelastic polyester, and the thermoplastic elastomer is at least exposed on the fiber surface, and these fibers are three-dimensional. A cushion body formed intertwined with each other,
In the structure, the first flexible heat-adhering point formed by mutual heat fusion in a state where the elastic composite fibers cross each other, and the elastic composite fibers and the polytrimethylene terephthalate-based crimped short fibers crossed each other. A cushion body having a flat surface integrally formed in a state in which the second flexible heat fixing points formed by thermal fusion of the elastic conjugate fibers in a state are scattered,
A skin cover body composed of a skin material and a surface fastener male material laminated and integrated on at least a part of one side of the skin material,
As the polytrimethylene terephthalate-based crimped short fibers, a first polytrimethylene terephthalate-based crimped short fiber of 3 to 9 decitex and a second polytrimethylene terephthalate-based crimped short fiber of 9 to 20 decitex are used,
The seat cover for a vehicle, wherein the hook part of the hook-and-loop fastener male material enters and engages with the surface layer of the cushion body, so that the skin cover body and the cushion body are detachably joined. Structure. 3. The vehicle according to claim 2 , wherein a mixed ratio of the first crimped short fiber and the second crimped short fiber is first crimped short fiber / second crimped short fiber = 30/70 to 70/30 (mass ratio). Seat seat structure. The structure for a seat seat of a vehicle according to any one of claims 1 to ³ , wherein a density of a portion from the engagement surface with the surface fastener male member to a depth of 3 mm in the cushion body is 10 to 70 kg / m ^3. . The structure for a seat of a vehicle according to any one of claims 1 to 4, wherein the density of the cushion body is 20 to 100 kg / m ³ .

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