JP6474279B2 - cushion - Google Patents

Description

  The present invention relates to a cushion in which a cushion sheet material, an intermediate sheet material, a core cushion material, and the like overlap in this order. The present invention relates to a cushion that improves the settling of a cushioning sheet material that is introduced in order to realize a soft sitting comfort and the like.

Conventionally, a fiber elastic body (cushion member) is known (patent document 1).
The fiber elastic body includes a three-dimensional structure having a binding point in which 50% by weight or more of the fiber material is made of carbon fiber, and the intersection of the fiber and the fiber is bound by the first binder resin, The binding point is reinforced with a second binder resin that is the same as or different from the first binder resin.

JP 2006-225771 A

However, since the fiber structure described in Patent Document 1 includes fibers arranged in random directions (random fibers) in an intricate manner, the fiber structure of Patent Document 1 is composed only of a skin material on its outer surface. When used also as a covered cushion, the skin material falls between the random fibers of the fiber structure.
Due to this depression, the load applied to the cushion concentrates on the portion of the skin structure where the random fibers of the fiber structure hit, so that the skin material is set along the random fibers.

Further, in the fiber structure of Patent Document 1, random fibers hit the user who is seated or the like (the user feels a random fiber hit), and soft feeling such as sitting comfort is lost. .
Furthermore, when the fiber structure of Patent Document 1 is used as a cushion, the fiber structure may be taken in and out of the covered skin material, but at the time of taking in and out, random fibers of the fiber structure hit (display) the display material. The skin material may be damaged.
However, Patent Document 1 does not mention any damage to the skin material or damage to the skin material.

  Therefore, the present invention makes the intermediate sheet material thinner than the buffer sheet material in the overlapping buffer sheet material, the intermediate sheet material, and the core buffer material, or the buffer sheet material in the overlapped front sheet material, buffer sheet material, and core buffer material. It is an object of the present invention to provide a cushion that simultaneously realizes “sag reduction” such as a cushioning sheet material and “holding a soft feeling” as a cushion by setting the thickness of the sheet to 5 mm to 40 mm.

The cushion 1 according to the present invention is a cushion in which at least a cushioning sheet material, an intermediate sheet material, and a core cushioning material overlap in this order, and the core cushioning material supports a load applied through the cushioning sheet material and the middle sheet material. has striatum, the in the sheet material rather thin than the cushioning sheet material, the thickness of the striatum in the core cushioning material is less 2.00mm or 0.17 mm, the core cushioning material, It is a fiber assembly in which the filaments are arranged three-dimensionally at random, and has at least one void of 5 mm or more and 20 mm or less between the three-dimensionally arranged filaments . It is characterized by.

A second feature of the cushion 1 according to the present invention is a cushion in which at least a front sheet material, a cushioning sheet material, and a core cushioning material are overlapped in this order, and the core cushioning material passes over the front sheet material and the cushioning sheet material. The buffer sheet material has a thickness of 5 mm or more and 40 mm or less, and the core cushion material has a thickness of 0.17 mm or more and 2.00 mm or less. The core cushioning material is a fiber assembly in which the filaments are arranged three-dimensionally at random, and has at least one gap of 5 mm or more and 20 mm or less between the three-dimensionally arranged filaments. It lies in the fact that you are.

According to a third feature of the cushion 1 according to the present invention, in addition to the first or second feature, the cushion sheet material, the intermediate sheet material, and the core cushion material, or the front sheet material, the cushion sheet material, and the core cushion. The materials are not fixed to each other while maintaining the overlapping order .

The fourth feature of the cushion 1 according to the present invention is that, in addition to the first to third features, the distribution of body pressure according to the weight of the user seated on the cushion is “FSA (Force Sensitive Applications, S6) manufactured by Verg. The number of sensors having a measured body pressure value of 180 mmHg or more and 200 mmHg or less when measured by “Expert” is 7 or less.

A fifth feature of the cushion 1 according to the present invention is that, in addition to the first to fourth features, the reduced thickness of the cushioning sheet material when pressed at 20 g / cm ² is 3 mm or more and 20 mm or less. .

A sixth aspect of the cushion 1 according to the present invention, in addition to the above first to fifth aspect, the thickness of the core cushioning material lies in at 20mm or more 50mm or less.

Due to these characteristics, at least the cushioning sheet material 2, the intermediate sheet material 3, and the core cushioning material 4 are stacked in this order, and the core cushioning material having the linear body 5 that supports the load applied through the cushioning sheet material 2 and the middle sheet material 3 is provided. 4, by using the intermediate sheet material 3 between the buffer sheet material 2 and the core buffer material 4, it is difficult for the buffer sheet material 2 to fall between the linear bodies 5 in the core buffer material 4 (buffer sheet material). 2 (a) in which a part of 2 is depressed, the buffer sheet material 2 is as illustrated in FIG. 2 (b) in which no part is depressed.
Accordingly, the load applied to the cushion 1 due to the user's seating or the like does not concentrate on the portion of the cushion cushioning material 2 where the filament 5 of the core cushioning material 4 hits as in Patent Document 1, but the cushioning seat. It is difficult for the material 2 to become sticky ("sag reduction" of the cushioning sheet material 2).
At the same time, since the cushioning sheet material 2 does not fall down, a user who is seated or the like hits not only the striated body 5 in the core cushioning material 4 but also the cushioning sheet material 2 universally. A feeling is maintained ("holding a soft feeling").

In the present invention, “overlap” means that the buffer sheet material 2, the intermediate sheet material 3, and the core buffer material 4, etc. may have a portion in which materials are stacked in this order. After the middle sheet material 3 and the core cushioning material 4 are stacked in this order, the middle sheet material 3 and the cushioning sheet material 2 are stacked again in this order below the core cushioning material 4.
In the present invention, “overlap” means that the materials 2, 3, 4 and the like are fixed to each other if materials such as the buffer sheet material 2, the intermediate sheet material 3, and the core buffer material 4 are stacked. (That is, the respective materials 2, 3, 4 etc. may change the distance and the relative position in the surface direction while maintaining the overlapping order). 4 etc. may be fixed to each other.
The “soft feeling” in the present invention is not only the comfort when the user is seated on the cushion 1 but also acts other than sitting (for example, putting a head on or lying down as a pillow or mat). The feeling that the user feels when a load is applied to the cushion 1 is also included.

Further, setting the basis weight M3 of the middle sheet material 3 to 20 g / m ² or more and 85 g / m ² or less, or setting the thickness D3 of the middle sheet material 3 to 100 μm or more and 1000 μm or less also contributes to maintaining a soft feeling.

Furthermore, at least the front sheet material 6, the cushioning sheet material 2, and the core cushioning material 4 are stacked in this order, and the core cushioning material 4 has a linear body 5 that supports the load applied to the surface sheet material 6 and the cushioning sheet material 2 at the same time. Further, by setting the thickness D2 of the cushioning sheet material 2 to 5 mm or more and 40 mm or less, as shown in Table 2 and FIGS. I can plan.
The thickness D2 ′ of the buffer sheet material 2 when pressed at 20 g / cm ² is 3 mm or more and 20 mm or less, or the thickness D4 of the core buffer material 4 is 20 mm or more and 50 mm or less. The thickness T of the body 5 is 0.17 mm or more and 2.00 mm or less, and the core cushioning material 4 is a fiber assembly in which the filaments 5 are randomly arranged in three dimensions. You may have at least one space | gap K of 5 mm or more and 20 mm or less between the bodies 5. FIG.

    According to the cushion according to the present invention, in the overlapping buffer sheet material, the intermediate sheet material, and the core buffer material, the intermediate sheet material is made thinner than the buffer sheet material, or in the overlapped front sheet material, buffer sheet material, and core buffer material. By setting the thickness of the sheet material to 5 mm or more and 40 mm or less, “sag reduction” of the sheet material and “maintenance of soft feeling” as a cushion can be realized simultaneously.

These are the cross-sectional schematic diagrams which showed the cushion which concerns on 1st Embodiment of this invention. Fig. 4A shows the suppression of the drop of the buffer sheet material, (a) is a drawing substitute photograph showing a state where the buffer sheet material is dropped because there is no intermediate sheet material, and (b) is a buffer by the intermediate sheet material. It is the drawing substitute photograph which showed the state by which the drop of the sheet material was suppressed. These are the cross-sectional schematic diagrams which showed the cushion based on 2nd Embodiment of this invention. These are the cross-sectional schematic diagrams which showed the cushion based on 3rd Embodiment of this invention. Indicates a replica of the buffer sheet material for performing test 1, (a) indicates a replica without the intermediate sheet material, and (b) indicates a replica with the intermediate sheet material. These are the cross-sectional schematic diagrams which showed the local stickiness depth and replica thickness in the replica of the buffer sheet material which performs the test 1. FIG. These are the plane | planar schematics which showed the body pressure dispersion | distribution figure in Examples 1-12 and Comparative Examples 1-3 in the test 2. FIG. These are the graphs which showed the area of the high load area | region in Examples 1-12 which performed Test 2, and Comparative Examples 1-3. These are the graphs which showed the area of the low load area | region in Examples 1-12 which performed the test 2, and Comparative Examples 1-3. These are the graphs which showed the tensile strength of the middle sheet material which performed the test 3. FIG.

<First embodiment of cushion 1>
Embodiments of the present invention will be described below with reference to the drawings.
1 to 10 show a cushion 1 according to the present invention.
Among these, FIG. 1 shows the cushion 1 according to the first embodiment of the present invention. The cushion 1 of the first embodiment includes a front sheet material 6, a buffer sheet material 2, an intermediate sheet material 3, and a core cushion material 4. Have the part which overlaps in this order.
In addition, although the cushion 1 of 1st Embodiment is explained in full detail later, each of the surface sheet material 6, the buffer sheet material 2, and the middle sheet material 3 may be formed in the bag shape.

Thus, if the sheet materials 6, 2, 3 are bag-shaped (because the sheet materials 6, 2, 3 wrap the core cushioning material 4 from above and below), the cushion 1 of the first embodiment can be viewed from above. After the sheet material 6, the buffer sheet material 2, the middle sheet material 3, and the core cushion material 4 are stacked in this order, the total of the middle sheet material 3, the cushion sheet material 2, and the front sheet material 6 below the core cushion material 4. Seven (seven layers) are stacked in this order.
Therefore, in the first embodiment, it can be said that the front sheet material 6, the buffer sheet material 2, the middle sheet material 3, and the core buffer material 4 are in an “overlapping” state in the present invention.

In 1st Embodiment, it is not ask | required whether the surface sheet material 6, the buffer sheet material 2, the middle sheet material 3, and the core buffer material 4 are mutually fixed as mentioned above.
In addition, if each raw material 6 and 2-4 can move relatively, it is possible to omit the process (labor) etc. which fix each other (adhesion, welding, etc.). Even if the relative movement is possible, if each of the front sheet material 6, the buffer sheet material 2, and the middle sheet material 3 is formed in a bag shape, it can be easily disassembled in a state where the respective materials 6, 2 to 4 are overlapped. do not do.

<Total thickness D1 etc. of cushion 1>
The overall thickness (overall thickness) D1 of the cushion 1 is not particularly limited, but may be, for example, 25 mm or more and 90 mm or less, preferably 27 mm or more and 75 mm or less, and more preferably 30 mm or more and 60 mm or less.
In addition, when the user sits with the cushion 1 laid on the seat surface of the chair, if the overall thickness D1 is too thick, the height of the seat surface changes greatly, so that a good sitting comfort as a chair is obtained. On the contrary, if the overall thickness D1 is too thin, it can be said that good cushioning properties (soft feeling) cannot be obtained.
The shape of the cushion 1 is not particularly limited, and may be, for example, a substantially polygonal shape such as a substantially rectangular shape, a substantially circular shape, or a substantially elliptical shape in plan view, and a substantially rectangular parallelepiped shape or a substantially pyramid shape. It may be a body shape, a substantially spherical shape, a substantially elliptical shape, a substantially cylindrical shape, a substantially conical shape, or the like.

The size of the cushion 1 is not limited in the same manner. For example, if the cushion 1 is substantially rectangular in a plan view, the size of the cushion 1 is 4. d) S size (width 51cm, length 55cm, cotton size), M size (width 55cm, length 59cm, inscription (complex size)), L size (width 59cm, length 63cm, eight ends) Size (old size)), tea seat size (width 43cm, length 47cm), citron size (width 63cm, length 68cm), couple size (width 67cm, length 72cm), etc. It doesn't matter.
In addition, for example, if the cushion 1 is substantially circular in a plan view, the diameter may be 40 cm or more and 75 cm or less. If the cushion 1 is a substantially rectangular parallelepiped, the width is 55 cm and the length is the same as the M size described above. The height may be 59 cm and the height may be 30 cm or more and 80 cm or less (a value greater than the total thickness D1 described above) (in this case, the cushion 1 alone can be used as a chair).
Moreover, it may be a size like a mat or a sofa.

<Buffer sheet material 2>
As shown in FIGS. 1 and 2, the cushioning sheet material 2 used in the cushion 1 of the first embodiment described above is a sheet-like material stacked between the front sheet material 6 and the middle sheet material 3, and has a core. It is located on the surface side (upper side) than the cushioning material 4.
The cushioning sheet material 2 in the first embodiment may have the core cushioning material 4 and the middle sheet material 3 formed in a bag shape inside, and the thickness D2 is the thickness D3 of the middle sheet material 3 described later. Thicker.

Since the buffer sheet material 2 is thicker, the buffer sheet material 2 has a larger room to be recessed when the linear body 5 of the core buffer material 4 hits than the middle sheet material 3. Such a load can be sufficiently buffered (relaxed), which contributes to maintaining a soft feeling.
The thickness D2 and the like of the buffer sheet material 2 will be described below.

<Thickness D2 etc. of buffer sheet material 2>
The thickness D2 of the buffer sheet material 2 may be any value as long as it is thicker than the thickness D3 of the middle sheet material 3. For example, the thickness D2 is 5 mm or more and 40 mm or less, preferably 8 mm or more and 35 mm or less, more preferably 10 mm or more. It may be 30 mm or less.
When the buffer sheet material 2 has the thickness D2 in such a range, when a load (weight) from a seated user or the like is applied, the cushion sheet material 2 can be more easily supported while maintaining a soft feeling.

The buffer sheet material 2 may be any sheet-like material as long as it has a predetermined thickness D2. For example, the cushion sheet material 2 may be a nonwoven fabric, a knitted fabric, a fabric such as a woven fabric, or the like.
When the buffer sheet material 2 is a non-woven fabric, for example, it may be a needle punched non-woven fabric in which fibers are entangled between reciprocating needles, and other heat-fusible fibers are contained and formed by heating. Thermal bond nonwoven fabric, chemical bond nonwoven fabric formed by spraying emulsion resin such as acrylic resin and urethane resin, and spunbond nonwoven fabric in which long fibers (filaments) spun from nozzles are laminated and bonded on a moving screen Alternatively, a stitch bonded nonwoven fabric or the like may be bonded by a needle punch method or the like.
In addition, when the buffer sheet material 2 is a non-woven fabric, it may be a non-woven fabric in which the above-described non-woven fabric is disposed in a wave shape (having fibers facing the thickness direction of the buffer sheet material 2). The number of fibers oriented in the thickness direction of the cushion sheet material 2 may be larger than the number of fibers oriented in the direction along the sheet surface of the buffer sheet material 2.

When the buffer sheet material 2 is a knitted fabric, the knitted fabric is knitted with warps or wefts. If the buffer sheet material 2 is a warp knitted fabric knitted with only warp yarns, for example, a knitted fabric that has a bulky feeling by raising tricot knitting or the like may be used.
In addition, when the cushioning sheet material 2 is a warp knitted fabric, it may naturally have a structure other than the tricot knitting, and in the weft direction with respect to a three-dimensional knitted fabric such as a double raschel knitting or a double raschel knitting. A knitted fabric with an insertion thread inserted may be used.

In addition to the above, when the cushioning sheet material 2 is a woven fabric, it may be a pile woven fabric (moquette or the like) having a pile on one side or both sides.
In addition, the buffer sheet material 2 may be a foamed resin obtained by foaming a synthetic resin such as urethane foam.

The material of the buffer sheet material 2 is polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), etc. However, it is not limited to these examples.
In addition to the polyester resin, the buffer sheet material 2 may be made of polyamide (nylon) resin such as aramid, polyolefin resin such as polyethylene (PE) or polypropylene (PP), polyacrylonitrile (PAN) resin, polyvinyl chloride. In addition to thermoplastic synthetic resins such as (PVC) resins and fluororesins, semi-synthetic resins such as rayon, cupra and acetate, natural materials such as cotton, wool, silk and hemp, or combinations of the above materials But there is no problem.

When the buffer sheet material 2 is a fabric such as a nonwoven fabric, a knitted fabric, or a woven fabric, the total fineness of fibers constituting them is not particularly limited, but is, for example, 0.5 dtex or more and 10000.0 dtex or less, preferably 0. It may be 8 dtex or more and 1000 dtex or less, more preferably 1.0 dtex or more and 500.0 dtex or less.
When the buffer sheet material 2 is a fabric such as a knitted fabric or a woven fabric, the fibers constituting them may be either multifilaments or monofilaments.
In order for the buffer sheet material 2 made of such a material to contribute to the maintenance of a soft feeling, it can be said that the thickness that is depressed (decreased) when a predetermined load is applied also affects.

<Decreased thickness D2 'of buffer sheet material 2>
In addition, the buffer sheet material 2 may have any value (thickness reduction) D2 ′ that decreases when the buffer sheet material is pressed at 20 g / cm ² , for example, 3 mm or more. It may be 20 mm or less, preferably 4 mm or more and 15 mm or less, more preferably 5 mm or more and 12 mm or less.
The range of the reduced thickness D2 ′ will be described in detail. When the reduced thickness D2 ′ is less than 3 mm, it is difficult to obtain a soft feeling (soft feeling) due to a feeling of bottoming when the user is seated. .

Furthermore, in the area for each pressure band of the body pressure dispersion and the seating comfort (soft feeling when seated) when the user is seated on the cushion 1 of the present invention, the area of the low load region which will be described in detail later is larger. (Or the smaller the area of the high-load region), it can be said that the seating comfort is superior, and from this, it is desirable that the reduced thickness D2 ′ when pressed at 20 g / cm ² is 3 mm or more. .
On the other hand, if the reduced thickness D2 ′ at the time of 20 g / cm ² pressurization is too large, that is, if it is too soft, it can be said that the buffer sheet material 2 itself is liable to stick out due to repeated seating by the user. It is desirable that the length D2 ′ is 20 mm or less.

<Medium sheet material 3>
As shown in FIGS. 1 and 2, the intermediate sheet material 3 used in the cushion 1 of the first embodiment described above is a sheet-like material stacked between the cushion sheet material 2 and the core cushion material 4. It is located on the surface side (upper side) than the cushioning material 4.
The middle sheet material 3 in the first embodiment may also be formed in a bag shape in which the core cushioning material 4 can be accommodated.

Thus, if the middle sheet material 3 is formed in a bag shape, the core cushioning material 4 and the middle sheet material 3 can be easily taken in and out together even when the core cushioning material 4 is taken in and out of the cushioning sheet material 2. It becomes difficult to damage the buffer sheet material 2 due to the strip 5 being caught ("damage suppression" of the buffer sheet material 2).
In addition, although the method of forming the middle sheet material 3 in a bag shape is not ask | required, it may be sewn in the bag shape by heat welding, for example, and rational production becomes possible (production efficiency improves). Thus, when sewing in the bag shape by heat welding, the middle sheet material 3 is comprised with the thermoplastic synthetic resin (thermoplastic synthetic resin).

The thickness D3 of the middle sheet material 3 is thinner than the thickness D2 of the buffer sheet material 2 described above. Thus, the middle sheet material 3 is thinner, so that the middle sheet material 3 is better than the cushion sheet material 2, Even if the linear body 5 of the core cushioning material 4 hits, there is little room to be recessed, and even when a load is applied due to the seating of the user or the like, the cushioning sheet material 2 is in a state of being stretched on the surface of the linear body 5. It becomes difficult to drop between the filaments 5 (see FIGS. 2A and 2B).
Accordingly, the load due to the user's seating or the like does not concentrate on the portion where the linear member 5 hits, and is supported as the entire middle sheet material 3. No. 2 “sag reduction”, that is, the durability of the cushioning sheet material 2 against sag is improved.

At the same time, since the cushioning sheet material 2 does not fall down, a user who is seated or the like hits not only the striated body 5 in the core cushioning material 4 but also the cushioning sheet material 2 universally. A feeling is maintained ("holding a soft feeling").
The relationship between the “sag reduction” and “damage suppression” of the cushioning sheet material 2 described so far, the “maintenance of softness” of the cushion 1 and the thickness D3 of the middle sheet material 3 will be described below.

<Thickness D3 of medium sheet material 3, basis weight M3, etc.>
The thickness D3 of the intermediate sheet material 3 may be any value as long as it is thinner than the thickness D2 of the buffer sheet material 2, but is, for example, 100 μm or more and 1000 μm or less, preferably 200 μm or more and 700 μm or less, more preferably 300 μm or more. It may be 500 μm or less.
Further, in the middle sheet material 3, the thickness D3 has a correlation with the weight per unit area (mesh weight M3) (the thinner the thickness D3, the lighter the weight M3 and the thicker the thickness D3, the thicker the sheet weight 3). It can be said that the basis weight M3 becomes heavy.

Therefore, when referring to the basis weight M3, the basis weight M3 of the middle sheet material 3 may be any value, but for example, 20 g / m ^{2 to} 85 g / m ² , preferably 25 g / m ^{2 to} 75 g / m ^2. More preferably, it may be 30 g / m ² or more and 60 g / m ² or less.
The basis weight M3 is mainly used as a value related to the middle sheet material 3 below.

If it explains in detail about the range of this basis weight M3, when it is less than 20 g / m ^2, it becomes difficult to suppress the middle sheet material 3 from supporting the cushioning sheet material 2 and falling between the filaments 5. Is preferably 20 g / m ² or more.
On the other hand, when the user is seated on the cushion 1 of the present invention, if the basis weight M3 of the middle sheet material 3 is too heavy (thickness D3 is too thick), the user removes the middle sheet material 3 (feeling of wrinkles, etc.). It can be said that the basis weight M3 of the middle sheet material 3 is desirably 85 g / m ² or less.

Further, the intermediate sheet material 3 may have any tensile strength, but for example, the tensile strength at the upper yield point is 0.1 kgf or more and 5.0 kgf or less, preferably 0.3 kgf or more and 4.5 kgf or less. Preferably, it may be 0.5 kgf or more and 4.0 kgf or less.
Further, even when a load is applied to the cushion 1 due to the user's seating or the like, the cushion sheet 2 is recessed in the thickness direction, so that the intermediate sheet 3 is less likely to extend in the direction along the seat surface, and the filament 5 Therefore, the middle sheet material 3 may have a predetermined tensile strength.
In addition, it can be said that the tensile strength of the middle sheet material 3 is also correlated with the basis weight M3.

The middle sheet material 3 may be any sheet-like material having a predetermined basis weight M3 (thickness D3), but may be a nonwoven fabric, a knitted fabric, a fabric such as a woven fabric, or the like.
When the middle sheet material 3 is a non-woven fabric, for example, it may be a spunbond non-woven fabric in which long fibers (filaments) spun from a nozzle are laminated and bonded on a moving screen. Thermal bond nonwoven fabric that contains fibers and is molded by heating, chemical bond nonwoven fabric that is molded by spraying emulsion resin such as acrylic resin and urethane resin, needle punched nonwoven fabric in which fibers are entangled between reciprocating needles , Stitch bond nonwoven fabrics, etc., or combinations thereof.
In addition, if it explains in detail about the spunbond nonwoven fabric, the spunbond nonwoven fabric has no fiber orientation in a specific direction, and the elongation characteristics in the vertical / horizontal / bias direction are equivalent to those of the woven / knitted fabric, which will be described later. Regardless of the direction of the filament 5 exposed on the surface of the core cushioning material 4, it is difficult to be affected by this, and it is possible to suppress sinking (sagging) into the gap between the filaments 5. It is.

When the middle sheet material 3 is a woven fabric, the woven fabric includes a taffeta woven fabric, a plain weave in which warps and wefts are alternately crossed, twill weave (oblique fabric), satin weave, plain woven fabric, twill woven fabric, Any woven structure such as a changed structure obtained by changing the satin weave Mihara structure, a double structure, a multiple structure more than double, and a crested woven structure (Jacquard woven) may be used.
When the middle sheet material 3 is a knitted fabric, the knitted fabric is knitted with warps or wefts. If the middle sheet material 3 is a warp knitted fabric knitted with only warps, for example, a tricot knitting may be used.

In addition, when the middle sheet material 3 is a warp knitted fabric, it may naturally have a structure other than the tricot knitting, and may be a cord knitting, a band knitting knitting, a thread knitting knitting (lace knitting), a pile knitting, or the like. Any warp knitting structure may be used.
Further, when the middle sheet material 3 is a warp knitted fabric, an insertion yarn may be inserted in the weft direction.

If the intermediate sheet material 3 is a weft knitted fabric knitted only with wefts, any of flat knitting, rubber knitting, pearl knitting, tuck knitting, floating knitting, double knitting, through hole knitting (lace knitting), pile knitting, etc. A weft knitting structure or a circular knitting structure may be used.
Further, when the middle sheet material 3 is a weft knitted fabric, an insertion yarn may be inserted in the warp direction as in the case of a warp knitted fabric.
In addition, the middle sheet material 3 may be formed into a film shape (layer shape) by applying a resin to a synthetic resin film or the back surface (the surface of the buffer sheet material 2 on the core buffer material 4 side) 2b of the buffer sheet material 2. Absent.

The material of the middle sheet material 3 is polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), etc. However, it is not limited to these examples.
The material of the intermediate sheet material 3 is not limited to the polyester resin, but a polyamide (nylon) resin such as aramid, a polyolefin resin such as polyethylene (PE) or polypropylene (PP), a polyacrylonitrile (PAN) resin, or polyvinyl chloride. In addition to thermoplastic synthetic resins such as (PVC) resins and fluororesins, semi-synthetic resins such as rayon, cupra and acetate, natural materials such as cotton, wool, silk and hemp, or combinations of the above materials But there is no problem.

When the middle sheet material 3 is a fabric such as a nonwoven fabric, a knitted fabric or a woven fabric, the total fineness of fibers constituting them is not particularly limited, but is, for example, 0.5 dtex or more and 10000.0 dtex or less, preferably 0. It may be 8 dtex or more and 1000 dtex or less, more preferably 1.0 dtex or more and 500.0 dtex or less.
When the middle sheet material 3 is a fabric such as a knitted fabric or a woven fabric, the fibers constituting them may be either multifilaments or monofilaments.

<Core cushioning material 4>
As shown in FIGS. 1 and 2, the core cushioning material 4 used in the cushion 1 of the first embodiment described above is surrounded by the front sheet material 6, the cushioning sheet material 2, and the middle sheet material 3. It is a member (core material) that supports a load due to seating or the like, and is located on the most central side of the other sheet materials 2, 3, 6.
The core cushioning material 4 in the first embodiment is a fiber assembly that has a linear body 5 to be described later and in which the linear body 5 is arranged three-dimensionally at random.

<Thickness D4 of the core cushioning material 4 etc.>
The thickness D4 of the core cushioning material 4 is not particularly limited, but may be, for example, 20 mm to 50 mm, preferably 20 mm to 40 mm, and more preferably 20 mm to 30 mm.
The shape of the core cushioning material 4 is not particularly limited, but may be, for example, a substantially polygonal shape such as a substantially rectangular shape, a substantially circular shape, or a substantially elliptical shape in plan view, like the cushion 1. Furthermore, it may be a substantially rectangular parallelepiped shape, a substantially pyramid shape, a substantially spherical shape, a substantially ellipsoidal shape, a substantially cylindrical shape, a substantially conical shape, or the like.

Similarly, the size of the core cushioning material 4 is not limited. For example, if the core cushioning material 4 has a substantially rectangular shape in plan view, the size of the above-described JIS-L-4403: 2000 4. The cushion cushion material 2, the middle sheet material 3, and the thickness D2 of the front sheet material 6 to be described later are determined from the width and length of the cushion 1 as a whole defined in d), such as S size, M size, and L size. , D3 and D6 may be subtracted.
In addition, if the cushion 1 is, for example, substantially circular in a plan view, the diameter of the cushion 1 is the thickness of the cushion sheet material 2, the middle sheet material 3, and the surface sheet material 6, which will be described later. The value may be a value obtained by subtracting D6, and if it is a substantially rectangular parallelepiped, the thicknesses D2, D3, and D6 of the sheet materials 2, 3, and 6 are subtracted from the width, length, and height of the cushion 1 as a whole. It may be a value.

The core buffer material 4 may be any material as long as it is a fiber assembly having the striated body 5. For example, polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT), poly Examples thereof include polyester resins such as trimethylene terephthalate (PTT), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN), but are not limited to these examples.
In addition to the polyester resin, the core buffer material 4 may be made of polyamide (nylon) resin such as aramid, polyolefin resin such as polyethylene (PE) or polypropylene (PP), polyacrylonitrile (PAN) resin, polyvinyl chloride. In addition to thermoplastic synthetic resins such as (PVC) resins and fluororesins, semi-synthetic resins such as rayon, cupra and acetate, natural materials such as cotton, wool, silk and hemp, or combinations of the above materials But there is no problem.
Furthermore, the core buffer material 4 may be comprised with the raw material which does not generate | occur | produce toxic gas at the time of combustion.

<Striatum 5>
As shown in FIGS. 1 and 2, the filament 5 used in the cushion 1 of the first embodiment described above is a fiber yarn included in the core cushioning material 4, and is tertiary within the core cushioning material 4. Originally arranged randomly.
Due to this three-dimensional random arrangement, the linear members 5 of the first embodiment have a gap K having a predetermined size between them, and the buffer sheet material 2 can fall into the gap K.
Therefore, the gap K and the like will be described below.

<Void K, thickness T, etc. of the filament 5>
The gap K of the filament 5 may be any size, but may be, for example, 5 mm to 20 mm, preferably 5 mm to 17 mm, and more preferably 7 mm to 15 mm.
The thickness (diameter) T of the filament 5 constituting the gap K may be any value, for example, 0.17 mm or more and 2.00 mm or less, preferably 0.30 mm or more and 1. It may be 70 mm or less, more preferably 0.40 mm or more and 1.50 mm or less.
Of course, the thickness T of the filament 5 can be expressed as the total fineness and is not particularly limited. For example, the thickness T is 300 dtex or more and 45000 dtex or less, preferably 1000 dtex or more and 30000 dtex or less, more preferably 2500 dtex or more and 20000 dtex or less. May be.

<Table sheet material 6>
As shown in FIGS. 1 and 2, the front sheet material 6 used in the cushion 1 of the first embodiment described above is a sheet-like material that overlaps the buffer sheet material 2 and covers the buffer sheet material 2. The other sheet materials 2 and 3 and the core cushioning material 4 are located on the most surface side (upper side).
The front sheet material 6 in the first embodiment may also be formed in a bag shape in which the buffer sheet material 2, the middle sheet material 3, and the core buffer material 4 can be accommodated.

The surface sheet material 6 may also be any sheet-like material, but, for example, a woven fabric that prints and dyes a predetermined knitted or woven structure and expresses the design with a pattern or hue (including white). A knitted fabric (woven fabric, knitted fabric) is preferable.
The front sheet material 6 is JIS-L-1096: 2010 method A19 (universal form method (A-1 method (planar method), A-2 method (bending method), A-3 method (folding)). Method))), B method (Scott method), C method (Theba method), D method (Accelerator method), E method (Martindale method) or F method (Uniform method (F-1 method ( The wear strength according to the steel blade method) and the F-2 method (abrasive paper method))) may be a predetermined value or more, a predetermined grade or more, and a predetermined value or less.

In addition, the front sheet material 6 is JIS-L-1076: 2012 pilling test method A method (method using an ICI type tester), B method (method using a TO type tester), C method (appearance retention) Method using a shape tester) or method D (method using a random tumble tester (method D-1 (using a chloroprene sheet and putting cotton fibers)), method D-2 (using a chloroprene sheet, It may be a predetermined grade or higher according to a method in which cotton fibers are not added) and D-3 (a method using a cork sheet))).
The thickness of the front sheet material 6 can be achieved by using the outermost surface of a woven or knitted fabric that is not limited in thickness and pattern and has excellent design properties (design properties). D6, density (weight per unit area), and thread type are not limited, but the thickness D6 of the front sheet material 6 will be described below.

<Thickness D6 of the front sheet material 6>
The thickness D6 of the front sheet material 6 is not particularly limited as described above, but is, for example, 0.05 mm to 10.00 mm, preferably 0.10 mm to 5.00 mm, and more preferably 0.30 mm to 3 It may be 0.000 mm or less.
In addition to the knitted fabric and woven fabric described above, the front sheet material 6 is a non-woven fabric, a film, or a film-like shape by applying a resin to the surface (surface exposed on the buffer sheet material 2) 2a of the buffer sheet material 2 (2a). (Layered) may be used.

If the surface sheet material 6 is a knitted fabric or a woven fabric, the surface sheet material 6 is a woven fabric, such as a woven fabric structure (Jacquard weave), a plain weave in which warp yarns and weft yarns are alternately crossed, or the like. In addition to twill weave (twill weave) and satin weave, these plain weave, twill weave, and satin weaving have changed the three primary structure, double structure (trans-double structure, weft double structure), more than double Any woven structure such as a multiple structure may be used.
If the front sheet material 6 is knitted, it is knitted with warps or wefts. If the front sheet material 6 is a warp knitted fabric knitted only with warp, for example, a tricot knitting (also called a denby knitting. Specifically, a triple tricot knitting with three heels or a double tricot with two heels. Knitting, single-tricot knitting with a single heel, etc.) and three-dimensional knitting such as double-raschel knitting.

In addition, when the front sheet material 6 is a warp knitted fabric, it may of course have a structure other than the tricot knitting. Code edition (1 × 3 single cord edition), double cord edition using 2 coffins, triple code edition using 3 coffins, etc., or Bandaique edition (also called Atlas edition). Any type of warp knitting structure such as a band knitting knitting, a double-band knitting knitting, a thread drawing knitting (lace knitting) or a pile knitting may be used.
Further, when the front sheet material 6 is a warp knitted fabric, an insertion yarn may be inserted in the weft direction.
If the front sheet material 6 is a weft knitted fabric knitted only with wefts, any of flat knitting, rubber knitting, pearl knitting, tuck knitting, floating knitting, double knitting, through hole knitting (lace knitting), pile knitting, etc. A weft knitting structure or a circular knitting structure may be used.
In the case where the front sheet material 6 is a weft knitted fabric, an insertion yarn may be inserted in the warp direction as in the case of a warp knitted fabric.

The material of the front sheet material 6 is also polyethylene terephthalate (PET), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), etc. However, it is not limited to these examples.
The material of the front sheet material 6 is not only polyester resin, but also polyamide (nylon) resin such as aramid, polyolefin resin such as polyethylene (PE) and polypropylene (PP), polyacrylonitrile (PAN) resin, polyvinyl chloride. In addition to thermoplastic synthetic resins such as (PVC) resins and fluororesins, semi-synthetic resins such as rayon, cupra and acetate, natural materials such as cotton, wool, silk and hemp, or combinations of the above materials But there is no problem.

When the front sheet material 6 is a fabric such as a knitted fabric, a woven fabric, or a non-woven fabric, the total fineness of fibers constituting them is not particularly limited, but is, for example, 0.5 dtex or more and 3000.0 dtex or less, preferably 0. It may be 8 dtex or more and 1000.0 dtex or less, more preferably 1.0 dtex or more and 500.0 dtex or less.
When the front sheet material 6 is a fabric such as a knitted fabric or a woven fabric, the fibers constituting them may be any of multifilament, monofilament, and span.

<Cushion 1 of the second embodiment>
FIG. 3 shows a cushion 1 according to a second embodiment of the present invention. Unlike the first embodiment, the cushion 1 according to the second embodiment has no intermediate sheet material 3, and has a front sheet material 6 and a buffer sheet material. 3 and the core cushioning material 4 have portions that overlap in this order.
Also in the cushion 1 of the second embodiment, each of the front sheet material 6 and the buffer sheet material 2 is formed in a bag shape as in the first embodiment.

Thus, if the sheet | seat materials 6 and 2 are bag shape, the cushion 1 of 2nd Embodiment is the buffer sheet material 2, the intermediate sheet material 3, the core buffer material 4, the intermediate sheet material 3, and the buffer sheet material from the top. 5 in total (5 layers) are stacked in this order, and in the second embodiment, the front sheet material 6, the buffer sheet material 2, and the core buffer material 4 can be said to be in an “overlapping” state in the present invention. .
Other configurations, operational effects, and usage modes of the cushion 1 are the same as those in the first embodiment.

<Modification of the cushion 1 of the first and second embodiments>
In addition, the cushion 1 which concerns on 1st, 2 embodiment may have the outermost sheet material 7 comprised by the cloth etc. which overlap further on the outer sheet material 6, and cover the said outer sheet material 6 ( In FIGS. 1 and 2, the outermost sheet material 7 is shown together with the outer sheet material 6).
In the cushion 1 in this modification, the outermost sheet material 7 prints and dyes a predetermined knitted structure / woven structure, expresses a design by a pattern / hue, and the outer sheet material 6 is a white warp knitted fabric. It is configured.

Further, the cushion 1 in the modified example is a sheet material (the buffer sheet material 2 or the middle) that directly overlaps (closest to) the core cushioning material 4, for example, the front sheet material 6 and the middle sheet material 3 are formed in a bag shape. Only the sheet material 3) and the most surface side sheet material (the front sheet material 6 or the buffer sheet material 2) may be bag-shaped.
Other configurations, operational effects, and usage modes of the cushion 1 are the same as those in the first and second embodiments.

<Cushion 1 of the third embodiment>
FIG. 4 shows a cushion 1 according to the third embodiment of the present invention. Unlike the first and second embodiments, the cushion 1 according to the third embodiment has no front sheet material 6 and has a cushioning sheet material 2 and a middle. The sheet material 3 and the core cushioning material 4 have portions that overlap in this order.
Also in the cushion 1 of the third embodiment, each of the cushioning sheet material 2 and the middle sheet material 3 is formed in a bag shape as in the first and second embodiments.

Thus, if the sheet | seat materials 2 and 3 are bag shape, the cushion 1 of 3rd Embodiment is the cushioning sheet material 2, the intermediate | middle sheet material 3, the core cushioning material 4, the intermediate | middle sheet material 3, and the cushioning sheet material from the top. A total of 5 (5 layers) of 2 are stacked in this order.
Therefore, it can be said that the third embodiment is also in the “overlapping” state of the buffer sheet material 2, the middle sheet material 3, and the core buffer material 4 in the present invention.
Other configurations, operational effects, and usage modes of the cushion 1 are the same as those in the first and second embodiments.

<Tests 1-3>
From here, the Examples 1-12 of the cushion 1 which concerns on this invention, and Comparative Examples 1-3 are mentioned first.
Tests 1 to 3 to be described later are performed using the members of Examples 1 to 12 and Comparative Examples 1 to 3 or each example.
In addition, Example 1-9 is 1st Embodiment mentioned above (in detail Example 1-4, 8, 9 is the cushion 1 which concerns on the modification of 1st Embodiment, Examples 5-7 are 1st Embodiment. Examples 10 to 12 are the second embodiment described above (specifically, Example 10 is a cushion 1 according to a modification of the second embodiment, and Examples 11 and 12 are the second embodiment). Such a cushion 1).

<Example 1>
The cushion 1 in Example 1 is a bag-like needle punched nonwoven fabric having a cushioning sheet material 2 made of polyester having a thickness D2 of 10 mm and a reduced thickness D2 ′ of 6 mm and having fibers in the thickness direction (described later). A buffer sheet material 2A), the middle sheet material 3 is a polypropylene-made bag-like spunbond nonwoven fabric (middle sheet material 3A described later) having a basis weight M3 of 30 g / m ² , and the core cushion material 4 has a thickness It is a fiber assembly in which filaments made of polyester fibers with a thickness of 30 mm are randomly arranged in three dimensions, and is a warp knitted fabric in which the front sheet material 6 is made of polyester and sewn into a bag shape by heat welding.
In addition, the outermost sheet material 7 is provided, and the outermost sheet material 7 is a jacquard woven fabric made of polyester.

<Example 2>
In the cushion 1 of Example 1, the middle sheet material 3 was changed to one having a basis weight M3 of 40 g / m ² (the later described middle sheet material 3B) to obtain the cushion 1 of Example 2.

<Example 3>
In the cushion 1 of Example 1, the middle sheet material 3 was changed to one having a basis weight M3 of 50 g / m ² (described later, middle sheet material 3C) to obtain the cushion 1 of Example 2.

<Example 4>
In the cushion 1 of Example 1, the middle sheet material 3 was changed to one having a basis weight M3 of 70 g / m ² (the later described middle sheet material 3D) to obtain the cushion 1 of Example 4.

<Example 5>
In the cushion 1 of the first embodiment, the buffer sheet material 2 is changed to one having a thickness D2 of 15 mm and a reduced thickness D2 ′ of 7 mm (buffer sheet material 2B described later), and the medium sheet material 3 has a basis weight M3 of 40 g. / things m ² changed to (sheet 3B in the below), changing the front sheet member 6 to the polyester jacquard fabrics, with the exception of the uppermost sheet material 7, and the cushion 1 of example 5.

<Example 6>
In the cushion 1 of Example 5, the cushioning sheet material 2 was changed to one having a thickness D2 of 25 mm and a reduced thickness D2 ′ of 12 mm (a cushioning sheet material 2C described later) to obtain the cushion 1 of Example 6.

<Example 7>
In the cushion 1 of Example 5, the cushioning sheet material 2 was changed to one having a thickness D2 of 7 mm and a reduced thickness D2 ′ of 5 mm (buffering sheet material 2D described later) to obtain the cushion 1 of Example 7.

<Example 8>
In the cushion 1 of Example 1, the middle sheet material 3 was changed to a bag-like taffeta woven fabric made of polyester (PET) having a basis weight M3 of 25 g / m ^2, and the cushion 1 of Example 8 was obtained.

<Example 9>
In the cushion 1 of Example 1, the middle sheet material 3 was changed to one having a basis weight M3 of 80 g / m ² to obtain the cushion 1 of Example 9.

<Example 10>
In the cushion 1 of Example 1, the cushion 1 of Example 10 was obtained except for the middle sheet material 3.

<Example 11>
In the cushion 1 of Example 5, the cushion 1 of Example 11 was obtained except for the middle sheet material 3.

<Example 12>
In the cushion 1 of Example 7, the cushion 1 of Example 12 was obtained except for the middle sheet material 3.

<Comparative Example 1>
In the cushion of Example 5, the cushion 1 of Comparative Example 1 was obtained except for the buffer sheet material 2 and the intermediate sheet material 3.

<Comparative example 2>
In the cushion of Example 5, except for the buffer sheet material 2 and the middle sheet material 3, the front sheet material 6 was changed to a double Raschel knitted fabric to obtain the cushion 1 of Comparative Example 2.

<Comparative Example 3>
In the cushion of Example 5, the cushion 1 of Comparative Example 3 was obtained except for the buffer sheet material 2, the middle sheet material 3, and the front sheet material 6.

<Test 1>
In Test 1, the buffer sheet material 2A, which is a bag-like needle punched nonwoven fabric made of polyester with the thickness D2 used in Examples 1 to 4 and 8 to 10 described above being 10 mm and the reduced thickness D2 ′ being 6 mm; The buffer sheet material 2B, which is a bag-like needle punched nonwoven fabric made of polyester with a thickness D2 of 15 mm and a reduced thickness D2 ′ of 7 mm used in the above-described Examples 5 and 11, and the above-described Example 6 The cushioning sheet material 2C, which is a bag-like needle punched nonwoven fabric made of polyester with a thickness D2 used of 25 mm and a reduced thickness D2 ′ of 12 mm, and the thickness D2 used in Examples 7 and 12 described above are 7 mm. And a cushioning sheet material 2D, which is a bag-like needle punched nonwoven fabric made of polyester with a reduced thickness D2 ′ of 5 mm, is evaluated.
First, the measurement of the local settling rate H for these buffer sheet materials 2A to 2D will be described.

<Local settling rate H of buffer sheet material 2>
As shown in FIGS. 5 and 6, the measurement of the local settling rate H of the buffer sheet materials 2 </ b> A to 2 </ b> D is first made by using the buffer sheet materials 2 </ b> A to 2 </ b> D in the set state as test pieces (replicas).
The creation of these replicas was performed under the conditions of <1> buffer sheet materials 2A to 2D and core buffer material 4 described above as examples of Examples 1 to 12 and Comparative Examples 1 to 3 in an 80 ° C. environment. A fiber assembly in which three-dimensionally arranged polyester fiber filaments having a thickness of 30 mm are stacked in this order (as illustrated in FIG. 5 (a), without the intermediate sheet material 3) and <2> Buffer sheet materials 2A to 2D and intermediate sheet material 3 as an example of the above-described Examples ² and 5-5, made of polypropylene with a basis weight M3 of 30 g / m ² and sewn into a bag shape by heat welding Two types (<1>) of the obtained spunbonded nonwoven fabric and the core cushioning material 4 similar to <1> stacked in this order (having the intermediate sheet material 3 as illustrated in FIG. 5B) <2>) is applied to the buffer sheet materials 2A to 2D with a pressure of 40 g / m ² from above. In addition, after leaving it to stand for 24 hours, the cushioning sheet materials 2A to 2D of <1> and <2> in which a set (dent) is formed are used as replicas.

As shown in FIG. 6, these created replicas of the cushioning sheet materials 2 </ b> A to 2 </ b> D of <1> and <2> are formed with a set, but by a visual observation through a magnifying glass or the like, set (dent) Mark the deepest part of the.
A predetermined plate (for example, a glass plate having a predetermined size and a thickness of 3 mm (this is a glass plate having a predetermined size) on the replica of the cushioning sheet materials 2A to 2D of <1> and <2> The pressure due to the weight of the glass plate is 0.713 g / cm ² ), etc.) is placed so that the marked surface is on the side in contact with the replica, and used as a reference surface (see FIG. 6).

The replica of the buffer sheet material 2A to 2D on which the reference surface is placed is marked with a mark formed in the deepest part of the recess in the replica of the buffer sheet material 2A to 2D by “Digital Microscope (VHX-1000)” manufactured by Keyence Corporation. Measure the distance of the mark on a given plate, set the value as the depth of the dent (that is, the local sag depth F), and the thickness from the reference surface to the replica back surface of the buffer sheet materials 2A to 2D as a replica The thickness is R.
In addition, by placing a predetermined plate having transparency on the replica and measuring it, it is possible to express the reference plane of the original that originally exists in the air. It becomes possible to measure the local cutting depth F and the replica thickness R.

Using the measured above-mentioned local settling depth F and replica thickness R, the settling rate (local settling rate) H is calculated by the following equation (1).

Local shear rate H (%) = (F / R) × 100 (= (F ÷ R) × 100) (1)

Table 1 below shows the local settling depth F, the replica thickness, and the local settling rate H in the replicas of the buffer sheet materials 2A to 2D.
In addition, with the improvement rate of the local settling in Table 1, each buffer which has <2> middle sheet material 3 from the local settling rate H in each buffer sheet material 2A-2D which does not have <1> middle sheet material 3. After subtracting the local settling rate H in the sheet materials 2A to 2D, it means that divided by the local settling rate H in each of the buffer sheet materials 2A to 2D without the sheet material 3 in <1>.

<Evaluation of Test 1 (Evaluation of cutting)>
As shown in Table 1, in any of the cushioning sheet materials 2A to 2D, when the intermediate sheet material 3 is not provided, local contact is caused by the contact with the linear body 5 exposed on the surface of the core cushioning material 4. Is confirmed.
On the other hand, when the intermediate sheet material 3 is provided, local settling is suppressed in any of the buffer sheet materials 2A to 2D.

That is, the middle sheet material 3 has less room for recession than the cushion sheet material 2 even when the filament body 5 of the core cushioning material 4 hits, and even when a load is applied by the user's seating or the like, The buffer sheet material 2 is less likely to fall between the filaments 5 due to the tension on the surface of the body 5.
Accordingly, the load due to the user's seating or the like does not concentrate on the portion where the linear member 5 hits, and is supported as the entire middle sheet material 3, so that the buffer sheet material 2 is less likely to be set up (buffer sheet material 2 "Spot reduction" is possible).
In addition, the improvement rate of local settling is the highest in the buffer sheet 2A.

<Test 2>
In Test 2, body pressure area and soft feeling are evaluated for the cushions of Examples 1 to 12 and Comparative Examples 1 to 3 described above.
First, measurement of the body pressure area and determination of soft feeling for the cushions of Examples 1 to 12 and Comparative Examples 1 to 3 will be described.
Note that the soft feeling in Test 2 is the sitting comfort of the seated user.

<Measurement of body pressure area and judgment of soft feeling>
In measurement of body pressure areas in the cushions of Examples 1 to 12 and Comparative Examples 1 to 3, first, the user actually sits on these Examples and Comparative Examples.
Depending on the weight of the seated user, pressure (body pressure) is applied to the cushions of Examples 1 to 12 and Comparative Examples 1 to 3, but the body pressure is not uniform. Measured with “FSA (Force Sensitive Applications, S6 Expert)”.

This "FSA" has a total of 1024 sensors in a vertical 530 mm x horizontal 530 mm measurement range, 32 vertical x 32 horizontal, and each of these sensors is applied to a portion where the sensor is located within the measurement range. Measure body pressure.
As shown in FIG. 7, the body pressure distribution in the measurement range of “FSA” is displayed by expressing the body pressure values measured by 1024 sensors with colors at the corresponding positions of the sensors.

Of the displayed body pressure distribution, the low load area (number of sensors that measured the value of the low load area) in the low load area (0 mmHg or more and 80 mmHg or less) and the high load area (the upper limit of the measurement range of 180 mmHg or more ( In the case of “FSA”, a high load area (the number of sensors in which the value of the high load region is measured) at 200 mmHg or less) is calculated. This high load area actually includes body pressure exceeding the upper limit of the measurement range, but includes the number of sensors whose upper limit is displayed as the measured value. There is no difference that a pressure of 180 mmHg or more is applied to the portion to be applied.
On the other hand, the sitting comfort (soft feeling) in the cushions of Examples 1 to 12 and Comparative Examples 1 to 3 indicates how the user feels when actually sitting on each cushion, “◎ (very comfortable sitting)” ”,“ ◯ (sitting comfort is good) ”,“ △ (sitting comfort is slightly good) ”,“ × (sitting comfort is bad) ”.
Comparing the judgment of sitting comfort with the low load area and high load area described above, at least the low load area is proportional to the comfort of sitting (the more the low load area, the better the sitting comfort). It can be said that the high load area tends to be inversely proportional to the comfort of sitting (the more the high load area, the worse the sitting comfort).

The low load area, high load area, and sitting comfort (soft feeling) in Examples 1 to 12 and Comparative Examples 1 to 3 described so far are shown in Table 2, and the body pressure distribution is shown in Examples 1 to 12 and Comparative Example 1. 7 are shown in FIG. 7, and graphs showing the low load area and the high load area of Examples 1 to 12 and Comparative Examples 1 to 3 are shown in FIGS.
In Table 2, there is also provided a column for the welding strength of the sewn portion of each middle sheet material 3 sewn into a bag shape by heat welding.

<Evaluation of Test 2 (Evaluation of body pressure distribution, soft feeling, etc.)>
As shown in Table 2, it is a cushion (Examples 1 to 9) having an intermediate sheet material 3, or the thickness D2 of the buffer sheet material 2 is 5 mm or more and 40 mm or less (or 20 g of the buffer sheet material 2). In the case of a cushion (Examples 10 to 12) having a reduced thickness D2 ′ of 3 mm or more and 20 mm or less at the time of / cm ² pressurization, the sitting comfort is “Δ” or more.
The following (1) and (2) will be described with reference to Table 2 in association with FIGS.

(1) Since the low load area calculated from the body pressure distribution is the least 506 Examples 11 among Examples 1 to 12 and Comparative Examples 1 to 3, the sitting comfort is “「 ”. If the low load area (the number of sensors in which the value of the low load area is measured) is equal to or greater than a predetermined number (for example, 500), the seating comfort is not greatly affected, regardless of the specific low load area.
(2) Examples in which the high load area calculated from the body pressure distribution is four or three with the largest high load area (number of sensors in which the value of the high load region is measured) among Examples 1 to 12. In 4, 7, 9, and 12, the seating comfort is “Δ”, while Comparative Examples 1 to 3 in which the high load area exceeds 8 pieces have all the seat comfort of “×”. The impact on the seating comfort is greater than that on the low-load area. If the high-load area is not less than a predetermined number (for example, 7), the seating comfort is deteriorated.

In addition, (3) and (4) are also mentioned.
(3) In Examples 5, 6, and 11, when the buffer sheet material 2 (buffer sheet materials 2B and 2C) having a larger thickness D2 is used, the high load area becomes 4 or less, and all the actual sitting comforts are " On the other hand, in Examples 7 and 12, when the buffer sheet material 2 (buffer sheet material 2D) having a small thickness D2 is used, the number of high load areas becomes three, and the actual sitting comfort is all. “△”.
That is, as long as the thickness D2 of the cushioning sheet material 2 is thicker than the middle sheet material 3, the sitting comfort is “Δ” or more at any value. For example, it can be said that the thickness D2 is preferably thicker. It can be said that 8 mm or more and 35 mm or less is more desirable, and 10 mm or more and 30 mm or less is further desirable.
(4) In Examples 1 to 4 and 8 to 10, the buffer sheet material 2A having a thickness D2 of 10 mm and a reduced thickness D2 ′ of 6 mm is commonly used, but the weight M3 is a heavy medium sheet In the case of the material 3 (the middle sheet material 3D having a basis weight M3 of 70 g / m ² in Example 4 and the middle sheet material 3 having a basis weight M3 of 80 g / m ² in Example 9), Examples 1 to 3 and 10 Unlike the above, there are four high load areas, and both of the actual sitting comforts are “Δ”.
That is, if the middle sheet material 3 is thinner than the thickness D2 of the cushioning sheet material 2, the sitting comfort is “Δ” or more at any value. For example, the basis weight M3 is not too heavy (thickness D3 is It can be said that it is not too thick), and more preferably 20 g / m ² or more and 60 g / m ² or less.

  Up to this point, we have focused on the comfort of the user sitting on the cushion, but of course, even when the cushion is used as a pillow or mat, the soft feeling of the seated user (ie, sitting It can be said that there is a tendency similar to

<Weld strength of the sewing part in the middle sheet material 3>
Table 2 also shows the welding strength of the sewing parts in which each of the middle sheet materials 3 is formed in a bag shape. This welding strength is the sewn portion with respect to the sewing parts having a width of 25 mm in the middle sheet material 3. This is a value obtained by measuring the test force (tensile force) when the sewn part peels in the process of gripping at a gripping distance (marking distance) of 30 mm and pulling with a tensile tester.
The unit of the test force (tensile force) described above is kgf (kg weight), and any value is sufficient if it is welded. , Less than 1.00 kgf may be set as “Δ”.

<Evaluation of Test 2 (Evaluation of Weld Strength)>
As shown in Table 2, among Examples 1 to 9 having the middle sheet material 3, the smallest welding strength used the middle sheet material 3 having the largest basis weight M3 of 80 g / m ² . “0.28 kgf” in Example 9 and the second smallest value of the welding strength is “0.68 kgf” in Example 8 using the middle sheet material 3 having the smallest basis weight M3 of 25 g / m ^2. is there.
That is, if the middle sheet material 3 is thinner than the thickness D2 of the cushioning sheet material 2, the seating comfort is “Δ” or more at any value. For example, the basis weight M3 is not too heavy and not too light (thickness). It can be said that the thickness D3 is not too thick and not too thin), and more preferably 30 g / m ² or more and 75 g / m ² or less.

In addition, even if the filament 5 is caught at the time of taking in / out the middle sheet | seat material 3 and the core shock absorbing material 4 accommodated in the inside by having the welding strength mentioned above become a predetermined value or more, it is a bag shape. The middle sheet material 3 becomes difficult to break.
Due to this difficulty of breakage, it is possible to suppress the filament 5 of the core cushioning material 4 from jumping out from the bag-shaped middle sheet material 3 and to further prevent the cushioning sheet material 2 from being damaged (of the cushioning sheet material 2). Further “damage suppression”).

<Test 3>
In Test 3, the intermediate sheet materials 3A, 3B, 3C, and 3D that are bag-like spunbond nonwoven fabrics made of polypropylene with the basis weight M3 used in Examples 1 to 4 described above being 30, 40, 50, and 70 g / m ^2. In contrast, the tensile strength is evaluated.
First, measurement of the tensile strength for these middle sheet materials 3A to 3D will be described.

<Tensile strength of middle sheet material 3>
In order to measure the tensile strength of the middle sheet materials 3A to 3D, first, test pieces of the middle sheet materials 3A to 3D are prepared.
The test pieces here are obtained by stacking the intermediate sheet materials 3A to 3D so as to have a width of 25.0 mm and a thickness of 1.8 mm.

In the process of pulling these specimens with a tensile tester with a gauge distance of 30.0 mm, the largest test force applied to each specimen (maximum point-test force (tensile force)), test at the breaking point Force (break point-test force (tensile force)), variation to break point (break point-displacement (length extended by tension)), test force at upper yield point (upper yield point-test force (tensile force)) ), And five test forces at the lower yield point (lower yield point-test force (tensile force)).
The maximum points-test force, break point-test force, break point-displacement, upper yield point-test force, lower yield point-test force in the middle sheet materials 3A to 3D described so far are shown in Table 2 below. FIG. 10 shows changes in test force in the sheet materials 3A to 3D.

The unit of the test force (tensile force) described above is kgf (kg weight), and the upper yield point-test force is the system error of the measured value. ) ± 1.0%.
Further, the horizontal axis of FIG. 10 shows the scale of the displacement of the middle sheet material 3A starting from the origin (0 mm), but the middle sheet materials 3B to 3D are respectively from 8 mm, 16 mm, and 24 mm for easy viewing. The scale is set to start (for example, the actual displacement in the middle sheet material 3D is subtracted 24 mm from the value on the horizontal axis in FIG. 7).

<Evaluation of Test 3 (Evaluation of Tensile Strength)>
As shown in Table 3 and FIG. 10, in the middle sheet materials 3 </ ^b > A to 3 </ ^b > D, the basis weight M < ^b > 3 has a maximum value (70 g / m ² ) that is about 2.3 times the minimum value (30 g / m ² ). The three values of point-test force, upper yield point-test force, and lower yield point-test force are all about 2 to 3 times the minimum value, but the break point-test force, break point- About two values of displacement, there is almost no difference in the middle sheet materials 3A to 3D.
Furthermore, as shown in Table 2 in Test 2 and FIGS. 7 to 9, the tensile strength of the intermediate sheet materials 3 </ b> A to 3 </ b> D and the basis weight M having a correlation with the tensile strength indicate that the intermediate sheet material 3 is the buffer sheet material 2. If it is thinner, it can be said that any value has little influence on the soft feeling and the sitting comfort is “Δ” or more.
In addition, the measurement of the tensile strength of the middle sheet material 3 is based on the ISO method in 6.3 of JIS-L-1913: 2010 including the test method mentioned above, or 8.14 of JIS-L-1096: 2010. JIS method (A method (strip method), B method (grab method), C method (wet strip method) or D method (grab method when wet)) or ISO method (E method (strip method), F method ( Grab method)).

<Others>
In addition, this invention is not limited to embodiment mentioned above. Each configuration of the cushion 1 or the like, or the overall structure, shape, dimensions, and the like can be appropriately changed in accordance with the spirit of the present invention.
In the first to third embodiments of the cushion 1, the front sheet material 6, the buffer sheet material 2, the middle sheet material 3, and the like are each formed in a bag shape, but for example, the front sheet material 6 and the middle sheet material 3. Is formed in a bag shape, and the buffer sheet material 2 is formed in a substantially plate shape, such as a sheet material (buffer sheet material 2 or intermediate sheet material 3) that directly overlaps (is closest to) the core buffer material 4, and is the most surface Only the sheet material on the side (the front sheet material 6 or the buffer sheet material 2) may be bag-shaped.

The buffer sheet material 2 may be fixed (integrated) to the front sheet material 6, or may have a fastener or the like that opens the two sheet materials 2 and 6 at the same time.
In this case, the intermediate sheet material 3 formed in a bag shape and the core cushioning material 4 accommodated in the intermediate sheet material 3 can be easily taken in and out together.

The middle sheet material 3 may have a shape other than a bag shape, and may be formed to cover (seal) the entire surface of the core cushioning material 4, for example.
The core buffer material 4 is a fiber assembly in which the filaments 5 are randomly arranged in a three-dimensional manner, but a configuration in which metal coil springs, metal S springs, and the like are laid out may also be used.
In this case, the line body 5 is a metal line body which each metal spring comprises.
Note that each material of the cushion sheet material 2, the middle sheet material 3, the core cushion material 4, the front sheet material 6, and the outermost sheet material 7 in the cushion 1 may be formed of a plurality of layers.

  The cushion of the present invention can be used not only for a seat on which a user is seated, but also any pillows, mats, mattresses, and chairs themselves as long as they are loaded.

1 cushion 2 buffer thickness D2 of the sheet material D2 buffer sheet member 'thick 4 core buffer having a basis weight of D3 in the sheet material of the cushioning sheet material 20 g / cm ² pressure of 3 thickness reduction in pressure time sheet material M3 in the sheet material Material D4 Thickness of core cushioning material 5 Core cushioning material T Thickness of core cushioning material K Kap gap between core cushioning material 6 Surface sheet material

Claims (6)

At least a cushion sheet material, a middle sheet material, and a core cushion material are stacked in this order, and the core cushion material has a linear body that supports a load applied over the cushion sheet material and the middle sheet material, the middle sheet material rather thin than the buffer sheet member,
The thickness of the filament in the core cushioning material is 0.17 mm or more and 2.00 mm or less,
The core cushioning material is a fiber assembly in which the filaments are arranged three-dimensionally at random, and has at least one gap of 5 mm or more and 20 mm or less between the three-dimensionally arranged filaments. cushion, characterized in that is. A cushion in which at least a front sheet material, a cushioning sheet material, and a core cushioning material overlap in this order, and the core cushioning material has a linear body that supports a load applied to the front sheet material and the cushioning sheet material, the thickness of the cushioning sheet material Ri der least 40mm below 5 mm,
The thickness of the filament in the core cushioning material is 0.17 mm or more and 2.00 mm or less,
The core cushioning material is a fiber assembly in which the filaments are arranged three-dimensionally at random, and has at least one gap of 5 mm or more and 20 mm or less between the three-dimensionally arranged filaments. cushion characterized by Tei Rukoto. The buffer sheet material, the middle sheet material, and the core buffer material, or the front sheet material, the buffer sheet material, and the core buffer material are not fixed to each other while maintaining the overlapping order. 2. The cushion according to 2. When the distribution of body pressure according to the weight of the user sitting on the cushion is measured by “FSA (Force Sensitive Applications, S6 Expert)” manufactured by Verg, the measured body pressure value is 180 mmHg or more and 200 mmHg or less. The number of the cushions according to any one of claims 1 to 3, wherein the number is seven or less. Cushion according to any one of claims 1 to 4, characterized in that the thickness reduction in the 20 g / cm ² pressurized cushioning sheet is 3mm or more 20mm or less. Cushion according to any one of claims 1 to 5, wherein the thickness of said core cushioning material is 20mm or more 50mm or less.