JP2022161013A - Mattress - Google Patents

Abstract

To provide a mattress for enabling a user to comfortably sleep while raising legs or feet.SOLUTION: A mattress is obtained by storing an inner material in a skin fabric. In the inner material, three or more belt shape projections 1-6 are arranged in an area corresponding to the area from a calf to a part of a sole when a person lies in a dorsal position. The height of at least the three of the belt shape projections is higher than the height of an area corresponding to an upper half body.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a bedding that allows comfortable sleeping with legs and feet raised. More specifically, three or more strip-shaped protrusions are arranged in a region corresponding to a part of the sole from the calf when in a supine position, and at least three of the strip-shaped protrusions have a height. To provide a mattress capable of supporting the heel from the calf without concentrating pressure on the heel from the calf by being higher than the height corresponding to the upper half of the body and allowing the user to sleep comfortably.

It is known that using a foot pillow that promotes blood circulation by elevating the legs and feet during sleep is effective in recovering from fatigue and removing swelling in the feet (for example, Patent Document 1). , Patent Documents 2 and 3).
However, in such a conventional technique, the feet are floating in the air, and there are many people who feel uncomfortable with the toes dangling.

On the other hand, there is also known a foot pillow in which the foot part does not float in the air and the heel part is in contact with the floor or the covering material (see, for example, Patent Document 4).

Japanese Patent Application Laid-Open No. 2007-260265 Utility model registration No. 3015186 JP-A-62-290414 Japanese Patent Application Laid-Open No. 2002-172043

However, with the technique described in Patent Document 4, the weight of the lower leg is concentrated on the heel, and many people feel uncomfortable because the heel hurts when sleeping for a long time.
As described above, conventional foot pillows are effective in promoting blood circulation during sleep, but they are not necessarily effective in improving comfort during sleep. Furthermore, users have various body shapes such as sex, height, weight, etc., but these points were not particularly considered.
The inventors of the present invention have continued to earnestly study mattresses that allow them to sleep comfortably while maintaining the advantages of foot pillows. reached.

That is, the present invention includes the following inventions.
A bedding in which a middle material is accommodated in a side material,
The intermediate material has three or more band-shaped protrusions arranged in a region corresponding to a part of the sole from the calf when a person is in a supine position,
The bedding, wherein at least three of the band-shaped projections are higher than the height of the region corresponding to the upper body.

According to the above configuration, three or more strip-shaped protrusions are arranged in a region corresponding to a part of the sole from the calf (the first strip-shaped protrusion, the second strip-shaped protrusion from the sole toward the upper body). part of the foot is fitted to the first belt-shaped projection (the sole is in contact with the first projection). The heel can be fitted between the first strip-shaped protrusion and the second strip-shaped protrusion (fixed to the valley between the protrusions) while the heel is fixed to the first strip-shaped protrusion. In addition, by fitting the second belt-shaped protrusion to the curved part from the calf to the heel (fixing it along the curve), the heel can be supported from the calf without concentrating pressure on the heel from the calf. You can sleep comfortably when using bedding.
At least three belt-shaped projections are higher than the height of the region corresponding to the upper body, so that the legs and feet can be lifted.
Furthermore, as described above, tall people can fit their heels between the first strip-shaped protrusion and the second strip-shaped protrusion (fixed to the valley between the protrusions). It is possible for a short person to fit the heel between the second strip-shaped protrusion and the third strip-shaped protrusion (fixed to the valley between the protrusions), It is possible to accommodate multiple people of different heights.

In the above configuration, it is preferable that there is an interval (gap) between the first strip-shaped protrusion and the second strip-shaped protrusion.

A space (gap) is provided between the first strip-shaped protrusion and the second strip-shaped protrusion, so that when a tall person fits the heel in the gap, the protrusion and the protrusion are separated from each other. The heel can be deeply inserted into the valley of the foot, and the sole, the heel and the calf can be supported at three points, making it more stable.

In the above configuration, it is preferable that there is an interval (gap) between the second strip-shaped protrusion and the third strip-shaped protrusion.

By providing a space (gap) between the second strip-shaped protrusion and the third strip-shaped protrusion, when a person of short stature fits his/her heel in the gap, the protrusion and the protrusion are separated from each other. The heel can be deeply inserted into the valley of the foot, and the sole, the heel and the calf can be supported at three points, making it more stable.

In the above configuration, it is preferable that the height of the first strip-shaped protrusion is equal to or higher than the height of the second strip-shaped protrusion.

The height of the first strip-shaped protrusion is equal to or higher than the height of the second strip-shaped protrusion, so that a tall person can use the first strip-shaped protrusion on the sole of the foot. It becomes easier to fit a part (the sole is brought into contact with the first projection and fixed), and the foot becomes more stable.

In the above configuration, it is preferable that the height of the second strip-shaped protrusion is equal to or higher than the height of the third strip-shaped protrusion.

The height of the second strip-shaped protrusion is the same as or higher than the height of the third strip-shaped protrusion, so that a short person can use the second strip-shaped protrusion on the sole of the foot. It becomes easier to fit a part (the sole is brought into contact with the second projection and fixed), and the foot becomes more stable.

In the above configuration, it is preferable that the intermediate material is a net-like structure. In addition, the network structure has a three-dimensional random loop bonded structure composed of continuous fibers of a thermoplastic elastomer having a fiber diameter of 0.1 mm or more and 3.0 mm or less, and an apparent density of 20 kg/m ³ or more and 150 kg/m ³ . The following are preferable.

Since the intermediate material is a predetermined network structure, the hardness and cushioning properties are improved while ensuring air permeability.

It was found that the bedding of the present invention provides comfortable sleep by holding the heel in the supine position. In particular, three or more strip-shaped protrusions are arranged in the region corresponding to part of the sole from the calf in the supine position (from the sole of the foot toward the upper body, the first strip-shaped protrusion, the second strip-shaped protrusion, are arranged in the order of the third strip-shaped protrusion), a part of the sole is fitted to the first strip-shaped protrusion (the sole is brought into contact with the first protrusion). The heel can be fitted between the first belt-shaped projection and the second belt-shaped projection (fixed in the valley between the projections) while fixing the heel. In addition, by fitting the second belt-shaped protrusion to the curved part from the calf to the heel (fixing it along the curve), the heel can be supported from the calf without concentrating pressure on the heel from the calf. (Hereinafter, the ordinal numbers such as "first" and "second" will be omitted, and it will be simply referred to as "belt-shaped protrusion".). At least three of the band-shaped projections are higher than the height of the region corresponding to the upper body when lying on the back, so that the legs and feet can be lifted.
In addition, the band-shaped protrusions are arranged repeatedly several times in the vertical direction of the bedding (the direction in which the user's body axis faces when sleeping), so that the user can fit the height and leg length of the user. You can also devise a way to choose where to do it.

Here, "fitting" means that the top of the strip-shaped protrusion, the slope of the strip-shaped protrusion, and/or the bottom surface between the strip-shaped protrusion and the adjacent strip-shaped protrusion is It means to selectively adhere to a part of the curved surface of the subject's body. However, it is different from low-resilience urethane foam, in which a medium material with a flat surface that does not have band-shaped projections is deformed along the curved surface of the subject's body by the dead weight of the subject's body, and is in close contact with the body.
In addition, "band-shaped protrusions" refer to horizontal stripe-shaped protrusions that extend in the horizontal direction when the body's elongation direction is vertical and the body's shoulder width direction is horizontal, and hill-shaped protrusions are different.

Since the bedding of the present invention has a highly air-permeable mesh structure, it is possible to keep the humidity of the space between the human body and the bedding low, making it difficult to feel stuffy in summer.

FIG. 1 is a sectional view of the middle material of the bedding 1 according to the first embodiment. FIG. 2 is a cross-sectional view of the middle material of the bedding 2 according to the second embodiment. FIG. 3 is a cross-sectional view of the middle material of the bedding 3 according to the third embodiment. FIG. 4 is a cross-sectional view of the middle material of the bedding 4 according to the fourth embodiment. FIG. 5 is a cross-sectional view of the middle material of the bedding 5 according to the fifth embodiment. FIG. 6 is a cross-sectional view of the middle material of the bedding 6 according to the sixth embodiment. FIG. 7 is a cross-sectional view of the middle material of the bedding 7 according to the seventh embodiment. FIG. 8 is a cross-sectional view of the middle material of the bedding 8 of Comparative Example 1. As shown in FIG. FIG. 9 is a cross-sectional view of the middle material of the bedding 9 of Comparative Example 2. As shown in FIG. FIG. 10 is a cross-sectional view of the middle material of the bedding 10 of Comparative Example 3. As shown in FIG. FIG. 11 is an enlarged view of an insert according to the present invention; FIG. 12 is a side view of the mattress 1 according to the first embodiment used by an adult male with a height of 170 cm and a standard figure. FIG. 13 is a pressure distribution diagram of the whole body when a male subject with a height of 170 cm and a weight of 64 kg uses the mattress 1 according to the first embodiment in the supine position. FIG. 14 is a pressure distribution diagram of the whole body when a male subject with a height of 170 cm and a weight of 64 kg uses the mattress 8 according to Comparative Example 1 in the supine position.

The present invention is a bedding in which the inner material is housed in the side material. The bedding refers to bedding on which a person sleeps while lying down, and includes a mattress, a mattress, an overlay, and the like.

The middle material used for the mattress of the present invention has three or more band-like protrusions arranged at least in the region corresponding to the calf to the foot when the person is in the supine position. It is preferable that the number of belt-shaped protrusions is 4 or more, more preferably 5, because the area can be raised to a position higher than the area corresponding to the upper body and the comfort during sleep can be increased. That's it. Also, the number is preferably 10 or less, more preferably 9 or less, and still more preferably 8 or less. When four or more strip-shaped protrusions are arranged, it is preferable that all of them are higher than the region corresponding to the upper half of the body. Here, the region from the calves to the feet refers to the portion where the calves and the feet come into contact when a person lies on the mattress in a supine position. For example, in the case of bedding for adults, the region is within 90 cm from the lower end of the middle material when the head side of the bedding in the vertical direction is the top and the foot side is the bottom. Conversely, the area within 70 cm from the upper end of the middle material is defined as "the area corresponding to the upper body". Also, the "foot" here refers to the portion from the ankle to the toe.

In the middle material used for the bedding of the present invention, at least three of the band-shaped projections are higher than the height of the region corresponding to the upper body when lying on one's back. In this way, both tall (eg, adult) and short (eg, dwarf) people can raise their legs and feet while sleeping. Here, the "leg" refers to the area from the ankle to the crotch.

The middle material used for the bedding of the present invention has three or more belt-shaped projections, and the belt-shaped projections are arranged from the sole of the foot toward the upper body to form a first belt-shaped projection, a second belt-shaped projection, and a second belt-shaped projection. When the first band-shaped convex portion and the third band-shaped convex portion are arranged in order, the first band-shaped convex portion to fit a part of the sole from the heel in the supine position, and the curve from the calf to the heel It has a second strip-like projection that fits over the part. Therefore, the leg and foot can be lifted without concentration of pressure while the heel is supported by the calf. This can increase comfort during sleep.

Further, for a short person, the first strip-shaped protrusion and the second strip-shaped protrusion can be read as a second strip-shaped protrusion and a third strip-shaped protrusion, respectively. It has a second strip-shaped protrusion to fit a portion of the heel to the sole of the foot, and a third strip-shaped protrusion to fit the curved portion from the calf to the heel. Therefore, even a short person can raise the leg and foot without concentration of pressure while the heel is supported by the calf. This can increase comfort during sleep.

Apices of the first strip-shaped protrusion, the second strip-shaped protrusion, and the third strip-shaped protrusion (hereinafter, the three strip-shaped protrusions are also collectively referred to as "specific strip-shaped protrusions") may be a flat plane or a curved surface with curvature. In the case of a curved surface, it is preferable to have a shape in which the vertex bulges upward.
When the vertex of the specific strip-shaped protrusion is a curved surface having a curvature, the line connecting the vertex of the strip-shaped protrusion and the midpoint of the width of the strip-shaped protrusion does not necessarily have to be perpendicular to the floor.
When the vertices of the specific strip-shaped protrusions are flat planes, the planes do not necessarily have to be parallel to the floor, and may be inclined with respect to the floor so as to fit the curved surface of the human body.

The inventors of the present invention have measured the shape of the apex of the specific band-shaped convex portion on various subjects ranging from small children to adults, and have found that a flat surface or a curved surface is preferable. Further, when the vertex of the band-shaped convex portion is curved, an upwardly bulging shape is preferable, and the curvature is from 2 to 70 m ⁻¹ . Therefore, the mattress of the present invention preferably has a specific belt-shaped projection with a curvature of 2 to 70 m ⁻¹ , and the first belt-shaped projection fits from the heel to a part of the sole in the supine position. 2 belt-shaped projections fit the curve from the calf to the heel. Furthermore, since the distance between the first belt-shaped projection and the second belt-shaped projection adjacent to the first belt-shaped projection is preferably 5 to 150 mm, the heel portion is the first belt-shaped projection. It is inserted and supported between the strip-shaped protrusion and the second strip-shaped protrusion. This allows the leg to be lifted without concentration of pressure from the calf to the heel, increasing sleeping comfort during use.

When the curvature of the calf-to-heel curve of various people, from children to adults, was measured, the curvature was 2 to 70 m ^-1 . When the vertex of the band-shaped convex portion of is curved, the curvature is preferably 2 to 70 m ⁻¹ . It is more preferably 3 m ⁻¹ or more, and still more preferably 5 m ⁻¹ or more. Further, it is more preferably 60 m ^-1 or less, and still more preferably 50 m ^-1 or less. Within the above range, the second strip-shaped protrusion and/or the third strip-shaped protrusion can fit along the curve from the calf to the heel. If the curvature of the second strip-shaped protrusion and/or the third strip-shaped protrusion is too small, the second strip-shaped protrusion and/or the third strip-shaped protrusion may be formed in the curved portion from the calf to the heel. can fit only some of the vertices of the , and not the slopes. Also, if the curvature is too large, only a portion of the slope of the second strip-shaped protrusion and/or the third strip-shaped protrusion may be fitted, and the vertex may not be fitted.

When the vertexes of the first strip-shaped protrusions are curved surfaces, the curvature is not particularly limited, but is preferably 2 to 70 m ⁻¹ like the curvature of the second strip-shaped protrusions. It is more preferably 3 m ⁻¹ or more, and still more preferably 5 m ⁻¹ or more. Further, it is more preferably 60 m ^-1 or less, and still more preferably 50 m ^-1 or less. Within this range, the foot is fixed and comfortable. The curvature of at least one of the specific strip-shaped convex portions is preferably within the range, more preferably both are within the range, and further preferably all are within the range. Further, the curvatures of the specific band-shaped convex portions may be the same or different.

The first strip-shaped protrusion and the second strip-shaped protrusion are adjacent to each other, and preferably adjacent to each other with a gap therebetween. It is preferable that the distance is 5 to 150 mm. As a result of examining various people from children to adults, the distance between the first strip-shaped protrusion and the adjacent second strip-shaped protrusion is preferably 5 to 150 mm, more preferably 8 to 130 mm. For example, when using the bedding, the heel portion fits into the valley between the first strip-shaped protrusion and the second strip-shaped protrusion. If the interval is too narrow, the heel part does not enter between the first strip-shaped protrusion and the second strip-shaped protrusion, and the toe may feel uncomfortable that the toe hangs around. If the interval is too wide, the heel part may feel uncomfortable that the toe hangs between the first strip-shaped protrusion and the second strip-shaped protrusion. The interval refers to the distance between the lowermost portions (roots of the protrusions) of the first strip-shaped protrusion and the second strip-shaped protrusion. Further, the second strip-shaped protrusion and the third strip-shaped protrusion are adjacent to each other, and preferably adjacent to each other with a gap therebetween. It is preferable that the distance between the second strip-shaped protrusion and the third strip-shaped protrusion is the same as the spacing between the first strip-shaped protrusion and the second strip-shaped protrusion.

Although the width of the strip-shaped convex portion is not particularly limited, it is preferably 30 to 250 mm. It is more preferably 40 to 200 mm, still more preferably 50 to 180 mm. Here, the width of the strip-shaped protrusion refers to the shortest distance between the lowest portion (base of the protrusion) of each strip-shaped protrusion. The width of each strip-shaped protrusion may be the same or may be different.

It is preferable that the filling material of the bedding of the present invention supports and lifts from the thighs to the toes. Raising the thigh to the tip of the foot improves comfort during sleep compared to raising only the leg or raising only the lower leg (knee to foot).

It is preferable that the height of the first strip-shaped protrusion of the filling material of the bedding of the present invention is the same as or higher than the height of the second strip-shaped protrusion. By doing so, the position of the foot is more fixed, and the user can sleep more comfortably at bedtime. In addition, if the legs are suddenly raised, pressure may be concentrated on the buttocks, back, and legs. get a good night's sleep. For the same reason, it is preferable that the height of the second strip-shaped protrusion is equal to or higher than the height of the third strip-shaped protrusion.

It is preferable that the filling material of the bedding of the present invention further has one or two or more belt-shaped projections on the upper body side from the specific belt-shaped projections. For example, if there are four belt-shaped projections on the upper body side from the specific belt-shaped projection, the fourth belt-shaped projection, the fifth belt-shaped projection from the side closer to the specific belt-shaped projection. , the sixth strip-shaped protrusion, and the seventh strip-shaped protrusion. Also, these are collectively referred to as a fourth band-shaped convex portion or the like. By having the fourth strip-shaped convex portion, etc., the area around the knee above the calf is also supported, so that a more comfortable sleep can be obtained. Regarding the adjacent strip-shaped protrusions, the second strip-shaped protrusion for the first strip-shaped protrusion and the third strip-shaped protrusion for the second strip-shaped protrusion are referred to as the "next strip-shaped protrusion". That's what it means. The same is true for the third belt-shaped convex portion and subsequent portions.

The interval between the strip-shaped protrusions in the fourth strip-shaped protrusion or the like is not particularly limited, but it is preferably within the same range as the interval between the first strip-shaped protrusion and the second strip-shaped protrusion. preferable.

Further, the vertex of each strip-shaped protrusion such as the fourth strip-shaped protrusion may be a flat plane or a curved surface having a curvature.
When the vertex of each strip-shaped protrusion such as the fourth strip-shaped protrusion is curved, the curvature thereof is not particularly limited, but may be within the same range as the curvature of the second strip-shaped protrusion. preferable.

The difference between the height of the first strip-shaped protrusion and the height of the region corresponding to the upper body is preferably 20 to 100 mm at the highest portion of the first strip-shaped protrusion. It is more preferably 25 mm or more, still more preferably 30 mm or more, because the effect of raising the leg is improved. In addition, it does not increase discomfort such as numbness in the legs even when used for a long time, difficulty in tossing and turning, and difficulty in sleeping in positions other than the supine position, such as lying down or lying down. It is preferably 90 mm or less, more preferably 90 mm or less. It is preferable that the height difference between the second belt-shaped projection and the region corresponding to the upper body is 15 to 70 mm at the highest portion of the second belt-shaped projection. It is more preferably 20 mm or more, and still more preferably 25 mm or more. Moreover, it is more preferably 65 mm or less, and still more preferably 60 mm or less. A preferred range of the height of the third strip-shaped protrusion is the same as the preferred range of the height of the second strip-shaped protrusion. It is preferable that the height difference between the areas corresponding to the upper body of each of the fourth strip-shaped protrusions and the like is 5 to 60 mm at the highest portion of the fourth strip-shaped protrusion and the like. It is more preferably 10 mm or more, and still more preferably 15 mm or more. Moreover, it is more preferably 55 mm or less, and still more preferably 50 mm or less. When there are a plurality of fourth strip-shaped protrusions, etc., one or more of these may have a height within the above range, and all of the fourth strip-shaped protrusions, etc. may be within the above range. More preferably, it has a height.

It is preferable that the height of the third strip-shaped protrusion is the same as or higher than the height of the fourth strip-shaped protrusion. Moreover, when there are a plurality of the fourth strip-shaped protrusions, etc., the third strip-shaped protrusion is preferably higher than all the fourth strip-shaped protrusions. By doing so, the position around the knee is stabilized, and you can sleep comfortably without any discomfort at bedtime.

Hereinafter, the present invention will be described in more detail based on the following embodiments, but the present invention is not limited by the following embodiments, and can be modified appropriately within the scope of the above and later descriptions. Of course, it is also possible to implement by adding and all of them are included in the technical scope of the present invention. Note that in each drawing, for the sake of convenience, reference numerals for members and the like may be omitted. In such cases, the specification and other drawings should be referred to. In addition, the dimensions of various members in the drawings may differ from the actual dimensions, since priority is given to helping to understand the features of the present invention.

First, the bedding 1 of the present invention will be described with reference to FIGS. 1 and 12. FIG. FIG. 1 is a sectional view of the middle material of the bedding 1 according to the first embodiment. Here, the cross-sectional view is a cross-sectional view when the bedding is cut in the longitudinal direction (the direction in which the body axis of the user faces when sleeping). The middle material of the bedding 1 includes a first strip-shaped protrusion 1, a second strip-shaped protrusion 2, a third strip-shaped protrusion 3, a fourth strip-shaped protrusion 4, and a fifth strip-shaped protrusion. It has a portion 5 and a sixth strip-shaped convex portion 6 . The vertices of the strip-shaped protrusions 4 to 6 are flat. FIG. 12 is a photograph taken from the side of the middle material of the bedding 1 according to the first embodiment, taken by a standard-sized adult male with a height of 170 cm. (Pictured with it removed). The first strip-shaped projection 1 supports the foot. The second strip-shaped projection 2 supports the curved part from the calf to the heel. The strip-shaped protrusions 3 to 5 support the calves. The belt-like projection 6 supports part of the thigh from the back of the knee. It can be seen that the portion from the calf to the heel fits to the first belt-shaped projection 1 and the second belt-shaped projection 2, 10 indicating the interval between the belt-shaped projections and the next belt-shaped projection. . Therefore, the bedding of the present invention does not wobble at the toes when used, and provides a comfortable sleeping experience.

The bedding 2 of the present invention will be described with reference to FIG. FIG. 2 is a sectional view of the middle material of the bedding 2 according to the second embodiment. Here, the cross-sectional view is a cross-sectional view when the bedding is cut in the longitudinal direction (the direction in which the body axis of the user faces when sleeping). The middle material of the bedding 2 includes a first strip-shaped protrusion 1, a second strip-shaped protrusion 2, a third strip-shaped protrusion 3, a fourth strip-shaped protrusion 4, and a fifth strip-shaped protrusion. It has a portion 5 , a sixth strip-shaped protrusion 6 , a seventh strip-shaped protrusion 7 , and an eighth strip-shaped protrusion 8 . The vertices of the strip-shaped protrusions 4 to 8 are flat. Assuming a state in which a standard-sized adult female with a height of 160 cm uses the apparatus, the first belt-shaped protrusion 1 supports the foot. The second strip-shaped projection 2 supports the curved part from the calf to the heel. The strip-shaped protrusions 3 to 5 support the calves. The band-shaped protrusions 6 to 8 support the thigh from the back of the knee. The area from the calf to the heel fits to the first belt-shaped projection 1 and the second belt-shaped projection 2, as well as the distance 10 between one belt-shaped projection and the next belt-shaped projection. Therefore, the bedding of the present invention does not wobble at the toes when used, and provides a comfortable sleeping experience.
Also, when used by a dwarf female with a standard body height of 140 cm, the second belt-shaped projection 2 may be used to support the foot. In that case, the second strip-shaped projection 2 supports the foot. The third strip-shaped projection 3 supports the curved portion from the calf to the heel. The fourth and fifth strip-shaped protrusions 4 and 5 support the calves. The sixth strip-shaped protrusion supports the back of the knee, and the seventh and eighth strip-shaped protrusions 7 and 8 support the thigh.

The bedding 3 of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of the middle material of the bedding 3 according to the third embodiment. Here, the cross-sectional view is a cross-sectional view when the bedding is cut in the longitudinal direction (the direction in which the body axis of the user faces when sleeping). The bedding 3 has a first strip-shaped protrusion 1, a second strip-shaped protrusion 2, a third strip-shaped protrusion 3, a fourth strip-shaped protrusion 4, and a fifth strip-shaped protrusion 5. have. Assuming that a standard-sized adult male with a height of 170 cm uses the apparatus, the first strip-shaped protrusion 1 supports the foot. The second strip-shaped projection 2 supports the curved part from the calf to the heel. The band-like protrusion 3 supports the back of the knee from the calf. The band-like projections 4-5 support the thigh from the back of the knee. The area from the calf to the heel fits to the first belt-shaped projection 1 and the second belt-shaped projection 2, as well as the distance 10 between one belt-shaped projection and the next belt-shaped projection. Therefore, the bedding of the present invention does not wobble at the toes when used, and provides a comfortable sleeping experience.

When the mattress of the present invention is used, the joint angle around the waist is changed, the contact area of the waist is increased, and the concentration of pressure on the back and buttocks is reduced, so that the user can sleep comfortably.

Recovery from fatigue can be expected to be quicker when the bedding of the present invention is used.

The type of the filling material of the bedding of the present invention may be foamed polyurethane made of polyurethane resin (low-resilience polyurethane, etc.), solid cotton obtained by thermally compressing short polyester fibers, or a net structure. Among them, a network structure is preferable. A network structure is a structure with a three-dimensional random loop joint structure in which continuous wires containing a thermoplastic resin are twisted to form random loops, and the loops are brought into contact with each other in a molten state and joined. is. .

The thermoplastic resin of the present invention includes known polyester thermoplastic elastomer resins, polyolefin thermoplastic resins, polyester resins, polyamide resins, polyethylene resins, polypropylene resins, polyurethane resins, polyvinyl resins, polycarbonate resins, polylactic acid, etc. Indicates a resin that melts when heated and solidifies when cooled.

Examples of the polyester-based thermoplastic elastomer include a polyester ether block copolymer having a thermoplastic polyester as a hard segment and a polyalkylenediol as a soft segment, or a polyester block copolymer having an aliphatic polyester as a soft segment. .
Examples of thermoplastic polyolefin elastomers include low-density polyethylene resins such as ethylene/α-olefin copolymer resins composed of ethylene and an α-olefin having 3 or more carbon atoms.

Since the net-like structure has a high porosity, the bedding made of the inner material of the net-like structure has excellent breathability compared to the bedding made of the inner material having low air permeability such as foamed polyurethane. Therefore, the temperature and humidity of the space between the human body and the bedding can be lowered, and it is possible to feel cool without feeling stuffy in the summer.

In the most preferred embodiment of the invention, the thermoplastic resin is a thermoplastic elastic resin. By using a thermoplastic elastic resin, the synergistic effect of the rubber elasticity and the spring elasticity of the coil loop integrated with the three-dimensional structure as a whole makes it easy to turn over and comfortable to sleep on. In addition, remelting makes it possible to regenerate the material, thus facilitating recycling. Among them, from the viewpoint of heat resistance and fatigue durability, a polyester-based thermoplastic elastomer resin is preferable, and a polyester ether block copolymer having a thermoplastic polyester as a hard segment and a polyalkylenediol as a soft segment is more preferable.

With respect to the fiber diameter of the continuous filaments constituting the network structure of the present invention, if the fiber diameter is too small, the hardness required for use as a cushioning material cannot be maintained. Therefore, it is necessary to set an appropriate range. The fiber diameter is preferably 0.1 mm or more, more preferably 0.2 mm or more. By setting the fiber diameter to 0.1 mm or more, it is possible to prevent the fiber from becoming too thin, to improve the denseness and the soft touch, and to secure the hardness required for the network structure. Also, the fiber diameter is preferably 3.0 mm or less, more preferably 2.5 mm or less. By setting the fiber diameter to 3.0 mm or less, a sufficient hardness of the network structure can be ensured, the network structure does not become too coarse, and other cushioning properties are improved.

The apparent density of the network structure of the present invention is preferably 20 kg/m ³ or more and 150 kg/m ³ or less, more preferably 25 kg/m ³ or more and 120 kg/m ³ or less, and 30 kg/m ³ or more and 100 kg/m ³ or less. is more preferable, and 35 kg/m ³ or more and 80 kg/m ³ or less is particularly preferable. When the apparent density is 20 kg/m ³ or more, the required hardness can be maintained even when used as a cushioning material. Also, when the weight is 200 kg/m ³ or less, it does not become too hard and is suitable as a cushioning material.

The continuous filamentary body constituting the network structure of the present invention may be a composite filamentary body in combination with another thermoplastic resin within the scope of not impairing the object of the present invention. Composite forms include sheath-core type, side-by-side type, eccentric sheath-core type composite linear bodies, etc., when linear bodies themselves are composited.

The network structure of the present invention includes a network structure made of fibers having a solid cross section (hereinafter referred to as "solid cross section fibers") in the thickness direction of the network structure, and a network structure in the thickness direction of the network structure. A network structure composed of fibers having a hollow cross-section (hereinafter referred to as "hollow cross-section fibers"), or a solid cross-section fiber main region mainly composed of solid cross-section fibers and a hollow cross-section fiber main region mainly composed of hollow cross-section fibers and a mixed region in which the solid cross-section fiber and the hollow cross-section fiber are intermingled between the solid cross-section fiber main region and the hollow cross-section fiber main region.

A solid cross-section fiber main region, a hollow cross-section fiber main region, and a mixed region in which the solid cross-section fiber and the hollow cross-section fiber are intermingled between the solid cross-section fiber main region and the hollow cross-section fiber main region. In the case of existing networks, they can be used reversibly. In the present invention, reversible use means that the network structure included in the cushioning material can be used from either the solid cross-section fiber main region side or the hollow cross-section fiber main region side. means that Therefore, use from only one side of the solid cross-section fiber main region side or the hollow cross-section fiber main region side in the mode of use falls under the use of the present invention. A particularly preferred form of the mattress of the present invention is a mattress in which the solid cross-section fiber main region faces the human body and the hollow cross-section fiber main region faces the floor surface. As an effect, the own weight of the legs can be firmly supported with a large contact area, good body pressure dispersion can be obtained, and comfortable sleep can be obtained.

The cross-sectional shape of the continuous filaments constituting the network structure of the present invention is preferably substantially circular for both the solid cross-section fibers and the hollow cross-section fibers. sometimes it is possible.

The network structure of the present invention can be processed into a molded body from the resin manufacturing process to the extent that the performance is not reduced, and can be deodorized, antibacterial, deodorant, antifungal, colored, aromatic, flame retardant, and moisture absorbing/releasing at any stage of commercialization. It is possible to process processing such as adding chemicals for imparting functions such as.

A well-known technique can be used for the manufacturing method of the filling material of the bedding of the present invention. For example, when the middle material is foamed polyurethane, a method of manufacturing a mold capable of imparting the shape of a band-shaped convex portion and performing mold foaming, or a method of shaping by CF cutting can be used. At this time, it is preferable that the mold is such that the belt-like convex portion has a flat surface or a curved surface that bulges upward.

When the middle material is a net-like structure, it is possible to cut the plate-shaped raw fabric with a blade such as a CF cut to form the above-mentioned strip-shaped protrusions. It is formed. In this case, it is not preferable because it may cause a feeling of discomfort when it protrudes from the side material and comes into contact with the skin. From this point of view, a method (thermoforming) in which heat is applied while applying pressure to a plate-like raw material using a mold capable of imparting the shape of belt-like protrusions is preferable. The belt-shaped projections obtained by thermoforming are formed of continuous fibers without being cut, and the cut surfaces of the fibers do not protrude from the side fabric.

The middle material of the bedding of the present invention may be a single layer, or a plate-like middle material having the first strip-shaped protrusion, the second strip-shaped protrusion, and the third strip-shaped protrusion on it. It may be a laminate obtained by superimposing another intermediate material having a convex portion. When stacking an intermediate material with multiple belt-shaped protrusions on a plate-shaped intermediate material, fix the intermediate material with multiple belt-shaped protrusions with an adhesive or a band so that it does not move. Only the laminated part It is desirable to integrate a plate-like inner material and an inner material having a plurality of band-like protrusions, for example, by putting it in an inner bag with a large gusset.
When a plate-like intermediate material and an intermediate material having a plurality of belt-like protrusions are superimposed, the types of the plate-like intermediate materials may be the same or different. Further, the plate-shaped intermediate material and the intermediate material having a plurality of band-shaped protrusions may have the same resin, density, thickness, fiber diameter, and fiber cross-section, or may be different in any of them.
The bedding of the present invention may be a 2-fold, 3-fold or 4-fold product that is vertically divided into 2, 3 or 4 sections.

Although the side fabric used for the bedding of the present invention is not particularly limited, woven fabrics, weft knitted fabrics, circular knitted fabrics, warp knitted fabrics, and the like are preferable. From the viewpoint of air permeability, circular knitted fabric, double raschel, and three-dimensional solid knitted fabric with a mesh structure having a high opening ratio are more preferable. Further, the side material may be welded so that the side material adheres to the band-shaped convex portion.

The filling material of the bedding of the present invention can also be used in combination with polyurethane foam, cotton, buckwheat hulls, and a net-like structure as long as the effect is not impaired.

The bedding of the present invention may be used in combination with another bedding made of foamed polyurethane, cotton, or a net-like structure, as long as the effect is not impaired.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the examples.

[Example 1]
A network structure (BREATHAIR (registered trademark) manufactured by Toyobo Co., Ltd.) having a width of 950 mm, a length of 650 mm, a thickness of 50 mm, and a density of 38 kg/m ³ made of a polyester thermoplastic elastomer fiber having a hollow cross section and a fiber diameter of 0.9 mm was used. Using a mold heated to 160 ° C., the network structure is subjected to a thermoforming process of softening and compression for 5 minutes while applying pressure, and the processed network structure is removed from the mold and cooled to room temperature. An upper layer network structure having a plurality of belt-like projections was produced. The upper layer network structure is a lower layer network structure ⁽ Brace manufactured by Toyobo Co., Ltd.) made of polyester thermoplastic elastomer fibers having a hollow cross section with a fiber diameter of 0.9 mm and a width of 950 mm, a length of 1980 mm, a thickness of 50 mm and a density of 38 kg/m3. Air (registered trademark)) in a region of 650 mm from the foot side end in the longitudinal direction to obtain an intermediate material having a shape shown in Table 1 and FIG. rice field. Next, the inner material was placed in an inner bag made of taffeta fabric made of polyester long fibers. At this time, the thickness direction gusset in the region 650 mm from the foot side end in the longitudinal direction is 100 mm, and the thickness direction gusset in the region 1330 mm from the head side in the longitudinal direction is to prevent the upper layer network structure having the plurality of belt-shaped protrusions from moving. A 55 mm inner bag was used to integrate the upper layer network structure and the lower layer network structure. The inner material integrated with the inner bag was housed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain bedding 1 . The double raschel lining used had a thickness gusset of 105 mm in a region 650 mm from the foot side in the longitudinal direction, and a gusset of 60 mm in a region 1330 mm from the head in the longitudinal direction.
In order to evaluate "comfort" when sleeping and "fatigue" when waking up, the bedding 1 of the present invention was laid in an environment of 25 ° C. and 50% RH, and a skin futon (manufactured by Nitori Co., Ltd., natural 10 adult male subjects with a height of 165 to 178 cm used it from 24:00 to 7:00. At this time, the first belt-like protrusion is made to fall asleep in a posture in which the foot is supported. Regarding "comfort" at bedtime, very uncomfortable (-3 points), uncomfortable (-2 points), slightly uncomfortable (-1 point), neutral (0 points), somewhat comfortable (+1 point), It was evaluated as comfortable (+2 points) and very comfortable (+3 points). Also, regarding "feeling tired" when waking up, very much (-3 points), feel (-2 points), somewhat feel (-1 point), neither (0 points), do not feel much (+1 point). , not felt (+2 points), and not felt at all (+3 points). Table 3 shows the results. In addition, in order to confirm whether the curve of the calf to the heel fits, the pressure distribution in the supine position of a male subject (height 170 cm, weight 64 kg) was measured, and the pressure distribution of the whole body as shown in FIG. got From the pressure distribution map, the contact area from the curve of the calf to the heel and the maximum pressure on the heel were determined. At this time, the measurement was performed in a posture in which the first strip-shaped convex portion supported the foot. Since the pressure distribution diagram is displayed at A in FIG. 13, it can be seen that the band-shaped protrusion is in contact with the curve from the calf to the heel of the subject.

[Example 2]
A width of 950 mm, a length of 700 mm ^, a thickness of 50 mm and a density of 40 kg/m. Using a three-layer network structure (Breath Air (registered trademark) manufactured by Toyobo Co., Ltd.), the network structure is softened and compressed for 5 minutes while applying pressure with a mold heated to 160 ° C. Thermoforming. An upper layer network structure having a plurality of belt-like protrusions was produced by removing the processed network structure from the mold and cooling it to room temperature. The upper layer network structure is made of solid cross-section fibers with a fiber diameter of 0.4 mm and polyester ^- based thermoplastic elastomer fibers with a hollow cross-section with a fiber diameter of 0.7 mm. The height of the first strip-shaped convex part is 95 mm, superimposed on the area of 700 mm from the longitudinal foot side end of the three-layer network structure (Breath Air (registered trademark) manufactured by Toyobo Co., Ltd.) A medium material having a shape shown in Table 1 and FIG. 2 was obtained. The middle material was placed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain a bedding 2 . The double raschel lining has a depth of 100 mm in the region 700 mm from the foot side in the longitudinal direction and a depth of 55 mm in the region 1280 mm from the head in the lengthwise direction.
The "comfort" at bedtime and the "feeling of fatigue" at awakening were evaluated under the same conditions, subjects, and number of subjects as in Example 1, using bedding 2 instead of bedding 1. Table 3 shows the results. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined.

[Example 3]
A network structure (Breath Air (registered trademark) manufactured by Toyobo Co., Ltd.) with a width of 950 mm, a length of 1980 mm, a thickness of 80 mm, and a density of 25 kg/m ³ made of polyester thermoplastic elastomer fibers with a solid cross section and a fiber diameter of 0.8 mm. is subjected to a thermoforming process in which the network structure is softened and compressed for 5 minutes while applying pressure with a mold heated to 160 ° C., and the treated network structure is removed from the mold and cooled to room temperature. The height of the strip-shaped protrusion of 1 is 75 mm, the region 850 mm from the foot side end in the longitudinal direction has a plurality of strip-shaped protrusions, and the region 1130 mm from the head side in the longitudinal direction is flat with a thickness of 40 mm. A medium material having a shape shown in Table 1 and FIG. 3 was obtained. The middle material was placed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain a bedding 3 . The double raschel lining has a thickness gusset of 80 mm in the region 850 mm from the foot side in the longitudinal direction and a gusset in the thickness direction of 45 mm in the region 1130 mm from the head side in the longitudinal direction.
Evaluation of "comfort" at bedtime and "feeling of fatigue" at awakening was performed under the same conditions, subjects, and number of subjects as in Example 1, except that bedding 3 was used instead of bedding 1. Table 3 shows the results. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined.

[Example 4]
A network structure (BREATHAIR (registered trademark) manufactured by Toyobo Co., Ltd.) made of a polyester thermoplastic elastomer fiber with a hollow cross section and a fiber diameter of 0.8 mm and having a width of 950 mm, a length of 720 mm, a thickness of 100 mm, and a density of ³⁰ kg/m3. , The network structure is subjected to a thermoforming process in which the network structure is softened and compressed for 5 minutes while applying pressure in a mold heated to 160 ° C., and the treated network structure is removed from the mold and cooled to room temperature, thereby forming a plurality of An upper layer network structure having band-like protrusions was produced. The upper layer network structure is a lower layer network structure (Breath Air (registered trademark) manufactured by Toyobo Co., Ltd.) made of hollow cross-section fibers with a fiber diameter of 0.5 mm, with a width of 950 mm, a length of 1980 mm, a thickness of 30 mm and a density of 55 kg/m ³ . , to obtain an intermediate material having the shape shown in Table 1 and FIG. The inner material was placed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain a bedding 4 . The double raschel lining has a depth of 130 mm in the region 720 mm from the foot side in the longitudinal direction, and a depth of 35 mm in the region 1260 mm from the head in the lengthwise direction.
The "comfort" at bedtime and the "feeling of fatigue" at awakening were evaluated under the same conditions, subjects, and number of subjects as in Example 1, using bedding 4 instead of bedding 1. Table 3 shows the results. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined.

[Example 5]
Using a polyethylene thermoplastic resin containing 92% polyethylene and 8% 1-butene as a raw material, made of solid cross-section fibers with a fiber diameter of 0.9 mm, width 950 mm, length 700 mm, thickness 45 mm, density 40 kg / m ³ and a polyethylene network structure B having a width of 950 mm, a length of 1980 mm, a thickness of 35 mm and a density of 50 kg/m ³ . Using the obtained polyethylene-based network structure A, the network structure was subjected to a thermoforming process in which the network structure was softened and compressed for 3 minutes while applying pressure with a mold heated to 90 ° C., and the network structure was processed from the mold. The body was taken out and cooled to room temperature to fabricate an upper-layer network structure having a plurality of band-like projections. The upper layer network structure is superimposed on the area of 700 mm from the foot side end in the longitudinal direction of the polyethylene network structure B, and the height of the first belt-shaped protrusion is 70 mm. A medium material having the shape shown was obtained. The middle material was placed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain a bedding 5 . The double raschel lining has a depth of 75 mm in the region 700 mm from the foot side in the longitudinal direction and a depth of 40 mm in the region 1180 mm from the head in the lengthwise direction.
The evaluation of "comfort" at bedtime and "feeling of fatigue" at awakening was carried out under the same conditions, subjects, and number of subjects as in Example 1, using mattress 5 instead of mattress 1. Table 3 shows the results. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined.

[Examples 6-7]
Using the same raw fabric for the upper layer network structure and the same raw fabric for the lower layer network structure as in Example 1, the middle material shown in Table 1, FIG. 6, and FIG. Beddings 6 and 7 were made using The "comfort" at bedtime and the "feeling of fatigue" at awakening were evaluated under the same conditions, subjects, and number of subjects as in Example 1, using mattresses 6 and 7 instead of mattress 1. Table 3 shows the results. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined.

[Comparative Example 1]
An upper network structure (Breath Air (registered trademark) manufactured by Toyobo Co., Ltd.) having a width of 950 mm, a length of 650 mm, a thickness of 45 mm, and a density of 42 kg/m ³ made of polyester thermoplastic elastomer fibers having a hollow cross section and a fiber diameter of 0.9 mm. A lower layer network structure (Breath Air (registered trademark) manufactured by Toyobo Co., Ltd.) having a width of 950 mm, a length of 1980 mm, a thickness of 50 mm, and a density of 38 kg/m ³ made of a polyester thermoplastic elastomer fiber having a hollow cross section and a fiber diameter of 0.9 mm. )), an intermediate material having a shape shown in Table 2 and FIG. Next, the inner material was placed in the same inner bag as in Example 1, and further placed in the same side material as in Example 1 to obtain bedding 8 . An area of 650 mm from the foot-side end in the longitudinal direction of the bedding 8 has no belt-like projection (no unevenness), and the entire area has a flat shape.
The "comfort" at bedtime and the "feeling of fatigue" at awakening were evaluated under the same conditions, subjects, and number of subjects as in Example 1, using bedding 8 instead of bedding 1. Table 3 shows the results. At this time, the subject was made to fall asleep in a region of 100 to 150 mm from the heel side end in the longitudinal direction. Further, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the pressure distribution diagram shown in FIG. 14 was obtained. . At this time, the heel part was measured in an area of 100 to 120 mm from the foot side edge in the longitudinal direction. From this pressure distribution map, the contact area from the curve of the calf to the heel and the maximum pressure on the heel were determined. Since the pressure distribution map is not displayed in B in FIG. 14, it can be seen that the curve from the calf to the heel of the subject is not touched. Note that C is the heel pressure.

[Comparative Example 2]
A network structure (BREATHAIR (registered trademark) manufactured by Toyobo Co., Ltd.) made of polyester thermoplastic elastomer fibers with a hollow cross section and a fiber diameter of 0.9 mm and having a width of 950 mm, a length of 1980 mm, a thickness of 55 mm, and a density of ³⁵ kg/m3. Using a mold heated to 160 ° C., the network structure is subjected to a thermoforming process of softening and compression for 5 minutes while applying pressure, and the processed network structure is removed from the mold and cooled to room temperature. A middle material of a network structure having two belt-like protrusions in a region of 220 mm from the longitudinal foot side end and having the shape shown in Table 2 and FIG. 9 was produced. In this intermediate material, the height of the first strip-shaped protrusion is 50 mm, and the difference from the height of the region corresponding to the upper half of the body is zero. The middle material was placed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain a bedding 9 . As for the double raschel lining, a lining with a thickness direction gusset of 55 mm was used in a region 1980 mm from the foot side end in the longitudinal direction.
The "comfort" at bedtime and the "feeling of fatigue" at awakening were evaluated under the same conditions, subjects, and number of subjects as in Example 1, using bedding 9 instead of bedding 1. Table 3 shows the results. At this time, the subject was made to fall asleep in a posture in which the heel portion was inserted into the groove between the first strip-shaped protrusion and the second strip-shaped protrusion. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined. At this time, the measurement was performed with the heel portion inserted into the groove between the first strip-shaped protrusion and the second strip-shaped protrusion.

[Comparative Example 3]
A network structure (BREATHAIR (registered trademark) manufactured by Toyobo Co., Ltd.) having a width of 950 mm, a length of 650 mm, a thickness of 50 mm, and a density of 38 kg/m ³ made of a polyester thermoplastic elastomer fiber having a hollow cross section and a fiber diameter of 0.9 mm was used. Using a mold heated to 160 ° C., the network structure is subjected to a thermoforming process of softening and compression for 5 minutes while applying pressure, and the processed network structure is removed from the mold and cooled to room temperature. An upper-layer network structure having only one band-like protrusion was produced. The upper layer network structure is a lower layer network structure ⁽ Brace manufactured by Toyobo Co., Ltd.) made of polyester thermoplastic elastomer fibers having a hollow cross section with a fiber diameter of 0.9 mm and a width of 950 mm, a length of 1980 mm, a thickness of 50 mm and a density of 38 kg/m3. Air (registered trademark)), having only a first strip-shaped protrusion having a height of 95 mm overlaid on an area of 650 mm from the longitudinal foot side end, and adjacent to the first strip-shaped protrusion A middle material having a shape shown in Table 2 and FIG. The inner material was placed in a side material using a double raschel knitted fabric made of polyester long fibers and having a basis weight of 200 g/m ² and a thickness of 5 mm to obtain a bedding 10 . In addition, the double raschel side fabric has a thickness direction gusset of 100 mm in the area 100 mm from the foot side edge in the vertical direction, a thickness direction gusset of 65 mm in the area 105 to 650 mm from the foot side edge in the vertical direction, and an area of 1330 mm from the head side in the vertical direction. A side fabric with a gusset of 55 mm in the thickness direction was used.
In other words, the bedding 10 has the shape of having the first strip-shaped protrusions but not having the second strip-shaped protrusions.
The "comfort" at bedtime and the "feeling of fatigue" at wakeup were evaluated under the same conditions, subjects, and number of subjects as in Example 1, using bedding 10 instead of bedding 1. Table 3 shows the results. In addition, the pressure distribution in the supine position was measured in the same manner as in Example 1, and the contact area from the calf to the heel curve to the heel and the maximum heel pressure were determined.

[Fiber diameter (mm)]
Ten fibers with a length of about 5 mm were randomly collected from the network structure. The thickness of the collected filaments was measured by focusing on the fiber diameter measurement point with an optical microscope at an appropriate magnification, and looking at the side of the fiber. The fiber diameter was obtained from the average value of 10 fibers. In addition, since the surface of the network structure was flattened to obtain smoothness, the cross section of the fiber may be deformed, so samples were not collected from the area within 2 mm from the surface of the network structure.

[Thickness and apparent density of network structure before thermoforming]
Four test pieces having a size of 10 cm long×10 cm wide×thickness of original fabric are taken from the network structure before thermoforming. After leaving the test piece unloaded for 24 hours, the height of the central portion of the upper surface of the test piece was measured with a thickness gauge manufactured by Kobunshi Keiki Co., Ltd. to determine the thickness Ti (mm) of the test piece. The weight Wi (g) of the test piece is measured using an electronic balance. Also, the apparent density Di (kg/m ³ ) of the test piece is obtained from the following formula. Di = Wi / (10 x 10 x Ti) x 10000
For the thickness Ti of the test piece and the apparent density Di of the test piece, the average values of the four test pieces are obtained, and the thickness of the network structure before thermoforming and the density of the network structure before thermoforming are respectively obtained.

[Height of band-shaped convex part]
Place the middle material used for the bedding on a horizontal floor, and use a height gauge to measure the distance from the highest part of the belt-shaped protrusion to the floor three times. The height of the material is Ha (mm).

[Height of the region corresponding to the upper body]
Place the material used for bedding on a horizontal floor, use a height gauge to measure the distance from the lowest part of the area corresponding to the upper body to the floor three times, and round off the average value to an integer value. The height Hb (mm) of the intermediate material in the area corresponding to the upper body was determined by rounding.

[Groove height between one strip-like protrusion and the next strip-like protrusion]
Place the middle material used for the bedding on a horizontal floor, and use a height gauge to measure the distance from the lowest surface of the groove between the adjacent belt-shaped protrusions to the floor three times. , the average value was rounded off to an integer value, and the height Hc (mm) of the groove between one strip-shaped protrusion and the next strip-shaped protrusion was determined.
If the groove between the adjacent strip protrusions is narrower than the thickness of the height gauge scriber, place the feeler gauge against the lowest surface of the groove and use a steel ruler to measure the distance from the floor to the feeler gauge. was measured three times, and the average value was rounded off to an integer value to obtain the height Hc (mm) of the groove between one strip-shaped protrusion and the next strip-shaped protrusion.

[Interval between one belt-shaped protrusion and the next belt-shaped protrusion]
The distance from the lowest point b of one strip-shaped protrusion to the lowest point c of the next strip-shaped protrusion was measured with a steel ruler, and was defined as the distance d between one strip-shaped protrusion and the next strip-shaped protrusion.

[Width of belt-shaped convex part]
The shortest distance between the lowest point a and the lowest point b of the strip-shaped protrusion was measured with a steel ruler, and the distance e of the strip-shaped protrusion was obtained.

[Difference between the height of the band-shaped convex portion and the height of the region corresponding to the upper body]
From the height Ha of the band-shaped convex portion and the height Hb of the intermediate member in the region corresponding to the upper body, the height of the intermediate member including the band-shaped convex portion and the height of the region corresponding to the upper body are calculated using Equation 1. A difference ΔH (mm) from the height of the intermediate material was obtained.

(Formula 1) ΔH = Ha-Hb

[Curvature of band-shaped convex part]
The arrow height h of the strip-shaped protrusion was obtained using Equation 2 from the height Ha of the strip-shaped protrusion obtained above and the height Hc of the groove between one strip-shaped protrusion and the next strip-shaped protrusion.
Next, from the arrow height h of the belt-shaped projection and the width e of the belt-shaped projection obtained by the above, the curvature radius R (m) of the belt-shaped projection is obtained using Equation 3, and the belt-shaped projection is obtained using Equation 4. The curvature K(m ⁻¹ ) of the convex portion was obtained (two significant digits).

(Formula 2) h = Ha - Hc

(Formula 3) R={(e ² +4×h ² )/(8×h)}×10 ⁻³

(Formula 4) K = 1/R

[Shape of vertex of belt-shaped convex part]
A steel ruler was placed on the vertex of the strip-shaped protrusion, and when the steel ruler was in contact with the vertex of the strip-shaped protrusion by 20 mm or more in the vertical direction, the shape of the vertex of the strip-shaped protrusion was judged to be "flat". .
When the contact between the steel ruler and the vertex of the strip-shaped protrusion was less than 20 mm in the vertical direction, the shape of the vertex of the strip-shaped protrusion was judged to be a "curved surface".

[Method for analyzing subjective evaluation results]
Regarding "comfort" at bedtime, very uncomfortable (-3 points), uncomfortable (-2 points), slightly uncomfortable (-1 point), neutral (0 points), somewhat comfortable (+1 point), comfortable ( +2 points) and very comfortable (+3 points), the average value of 10 subjects was calculated. A score greater than 1 was indicated by ⊚, a score between 0 and 1 was indicated by ○, and a score lower than 0 was indicated by ×.
Regarding "Fatigue" when waking up, very much (-3 points), feel (-2 points), somewhat feel (-1 point), neither (0 points), do not feel much (+1 point), feel The average value of the 10 subjects was calculated for the evaluation results of not feeling (+2 points) and not feeling at all (+3 points). A score greater than 1 was indicated by ⊚, a score between 0 and 1 was indicated by ○, and a score lower than 0 was indicated by ×.

[Contact area from heel to calf, maximum pressure]
In an environment of 25 ° C. 50% RH, a large area pressure distribution measurement system BIG-MAT (manufactured by Nitta Co., Ltd.) is installed on the bedding in the present invention, and the subject is in the supine position. distribution was measured. Considering the effect of creep of the sensor, the pressure was measured after 1 minute in the supine position. The test subject is a normal-sized male with a height of 170 cm.
After the measurement, the pressure from the heel to the calf is greater than 0 mmHg at 20.32 cm in the vertical direction (the direction in which the body axis of the user faces when sleeping) and 14.224 cm in the horizontal direction (the direction perpendicular to the body axis when sleeping). The number was counted, and the area where the body was in contact with the bedding was obtained, and this was taken as the contact area from the heel to the calf. In addition, the average pressure in the heel region in 3 cells in the vertical direction (the direction in which the user's body axis is directed when sleeping) and 3 cells in the horizontal direction (perpendicular to the body axis when sleeping) (area 9.29034 cm ² ) Find the maximum pressure.

It was confirmed that Examples 1 to 7 were more comfortable to sleep than Comparative Examples 1 to 3, with no feeling of fatigue when waking up. From the pressure distribution, in Examples 1 to 7, compared to Comparative Examples 1 to 3, the area where the body was in contact with the bedding from the calf to the heel was large, and the maximum pressure at the heel was small. It was confirmed that the weight of the body can be dispersed and that it can be used comfortably. Since Comparative Example 3 has a shape in which there is only one first band-shaped convex portion, the bedding fits the curve from the sole to the heel, but the bedding does not fit from the heel to the ankle, and the calf. The contact area at the toe heel became extremely small, and the maximum pressure on the heel increased. In addition, the heel was not stable and wobbled, making sleeping uncomfortable.

The mattress of the present invention can support the heel from the calf without concentrating pressure on the heel from the calf, and can sleep comfortably, so it is expected to reduce swelling and reduce fatigue without burden during use. can be used for health maintenance.

1 to 8 strip-shaped protrusions 10 spacing between strip-shaped protrusions and the next strip-shaped protrusion

Claims (7)

A bedding in which a middle material is accommodated in a side material,
The intermediate material has three or more band-shaped protrusions arranged in a region corresponding to a part of the sole from the calf when a person is in a supine position,
The bedding, wherein at least three of the band-shaped projections are higher than the height of the region corresponding to the upper body. The strip-shaped protrusions are arranged in the order of the first strip-shaped protrusion, the second strip-shaped protrusion, and the third strip-shaped protrusion from the sole of the foot,
2. The bedding according to claim 1, wherein a space is provided between said first strip-shaped protrusion and said second strip-shaped protrusion. 3. The bedding according to claim 2, wherein a space is provided between the second strip-shaped protrusion and the third strip-shaped protrusion. The bedding according to claim 2 or 3, wherein the height of said first strip-shaped protrusion is equal to or higher than the height of said second strip-shaped protrusion. The bedding according to any one of claims 2 to 4, wherein the height of the second strip-shaped protrusion is equal to or higher than the height of the third strip-shaped protrusion. The bedding according to any one of claims 1 to 5, characterized in that said filling material is a net-like structure. The network structure has a three-dimensional random loop bonded structure composed of thermoplastic elastomer continuous lines having a fiber diameter of 0.1 mm or more and 3.0 mm or less, and an apparent density of 20 kg/m ³ or more and 150 kg/m ³ or less. 7. Bedding according to claim 6, characterized in that:

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