JP4281905B2 - Cover material such as mattress - Google Patents

Description

  The present invention relates to a cover member suitable for, for example, a mattress used in a hospital or a nursing facility, a cushion for a wheelchair, or the like.

Conventional mattresses used in hospitals and nursing homes, for example, prevent sweat, excrement, body fluids, and filth from penetrating into the mattress and becoming unsanitary. As a technique for preventing this, for example, a technique in which a non-permeable and non-breathable synthetic resin film is attached so as to wrap around the entire periphery of a mat material (core material) such as urethane foam ( For example, refer to Patent Document 1.) or a technique of laminating a cushion slab material having low resilience on the surface of a cushion slab base material to form a core material and welding or bonding a synthetic resin film to the surface of the cushion slab material ( For example, see Patent Document 2).
In addition, a technique is also known in which instead of directly attaching a synthetic resin film to a core material, the periphery of the core material is covered with a cover member that is sewn with, for example, vinyl chloride leather or synthetic leather.

JP 2000-342390 A JP 2000-5244 A

However, the method of directly welding or adhering the synthetic resin film to the surface of the mattress core material as in the above-described technique is possible even when the core material is a material having excellent body pressure dispersibility. If the elongation is not ensured, there is a problem that the effect of dispersing body pressure is not sufficiently exhibited.
In addition, even if an easy-to-extend film layer is provided, it is not possible to replace the core material alone even if it is attempted to replace the core material for a reason such as the core material sagging after a period of time, and it is necessary to replace the entire core material. there were.

In addition, in the method of covering with a cover member sewed with vinyl chloride leather or synthetic leather, the friction coefficient of the surface is important for pressure ulcer prevention, etc. If the friction coefficient is too small, for example, sheets and sweat pads are used together When doing so, sheets and sweat pads become slippery, and wrinkles and wrinkles are generated on the sheets and the like, which may be a cause of worsening pressure ulcers. Also, if the coefficient of friction is too high, for example, the sheets do not slip even when the back is lifted with an electric bed, for example, the sheets remain in close contact from the patient's buttocks to the back, increasing the feeling of pressure. There are problems such as.
In particular, vinyl chloride leather cannot sufficiently follow the deformation of the core material because the elongation of the vinyl chloride layer is small, and may impair body pressure dispersion performance and cushion performance of the core material.

  Therefore, the present invention prevents sweat, excrement, body fluid, filth, etc. from penetrating into the mattress and becoming unsanitary, and is effective in preventing pressure ulcer without impairing the body pressure dispersion effect of the core material. An object of the present invention is to provide a mattress cover member.

In order to achieve the above object, the present invention provides a cover member configured to cover at least a surface in contact with a human body around a core material made of a flexible urethane foam. It is made to comprise by laminating | stacking a urethane layer on the surface of this, and the elongation rate at the time of the fracture | rupture according to JISK6772 of the said fiber cloth shall be 80-150% of a length direction, 150-250% of a horizontal direction, The static friction coefficient according to JIS K 7125 was set to 0.6 to 0.8, and the dynamic friction coefficient was set to 0.5 to 0.7.
Here, when the elongation at break of the fiber cloth is less than 80%, the cover member cannot sufficiently follow the deformation of the core material of the mattress and the cushion, and the body pressure dispersion performance of the core material of the mattress and the cushion and the cushion Sex may be inhibited. Further, in the case of a mattress, by changing the sleeping posture, the cover member is particularly deformed in the width direction of the mattress, and elongation is required. Therefore, in the fiber cloth, the horizontal direction, which is a generally easy to stretch direction, has an elongation at break of 150% or more.
Moreover, if the elongation of the fiber cloth is large, the urethane layer laminated on the surface of the fiber cloth is easily cracked. When the urethane layer is cracked, there is a problem that the waterproof property is deteriorated. Therefore, the elongation at break of the fiber cloth is set to 150% or less in the vertical direction and 250% or less in the horizontal direction.

The urethane layer on the surface of the cover member prevents sweat, excrement, bodily fluids, dirt, etc. from penetrating into the mattress, and the cover member extends in accordance with the deformation of the core material. Thus, the body pressure dispersibility of the core material is prevented from being impaired. In addition, the prevention of pressure ulcer is made effective by setting the static friction coefficient and the dynamic friction coefficient of the urethane layer within a predetermined range.
In this case, the urethane layer is impermeable to water, but is preferably moisture permeable so as to prevent stuffiness and the like, and more preferably an antibacterial agent is added.
As the formation of the urethane layer, for example, a urethane film may be welded and adhered to the fiber cloth surface, or the urethane film and the woven cloth may be bonded via an adhesive, and formed on the release paper. The urethane film may be transferred to the woven fabric, or the urethane solution may be applied to the fiber fabric surface and dried.

Further, when the static friction coefficient of the urethane layer surface is 0.6 or less, or the dynamic friction coefficient is 0.5 or less, for example, when using a sheet or a sweat pad together, the sheet becomes slippery, which may be caused by misalignment or wrinkle of the sheet or the like. Causes or exacerbates pressure ulcers. Further, when the coefficient of static friction is 0.8 or more or the coefficient of dynamic friction is 0.7 or more, for example, the sheets do not slip even when the back is lifted by an electric bed, for example, the sheets etc. remain in close contact from the patient's buttocks to the back. Become a state and increase the feeling of pressure. For this reason, a static friction coefficient and a dynamic friction coefficient shall be in the said range.
In addition, such a cover member can be removed and washed when the cover member is extremely dirty by being detachably attached to the core member with a fastener or the like, and is hygienic.

In the present invention, the urethane layer of the cover member is polycarbonate urethane.
Here, polycarbonate urethane is less susceptible to hydrolysis than other polyester polyurethanes and polyether urethanes, is less susceptible to degradation by higher fatty acids contained in sebum, is superior in strength, and tears Is unlikely to occur.
In addition, even when the surface is contaminated with body fluids, it can be cleaned with water, warm water or a neutral detergent, and then wiped with disinfecting alcohol for easy disinfection.

Further, in the present invention, when the cover member is used for a mattress or the like, an anti-slip material is disposed on a portion of the cover member that becomes a bottom surface of the mattress or the like.
If the anti-slip material is disposed on the bottom surface of the cover member in this way, for example, when applied as a cushion material for a wheelchair, it is difficult to slip from the wheelchair, and it is easy to use.
In addition, as an anti-slip | skid material, what formed many resin-made convex parts on the surface by dot processing etc. is applicable.

  In addition, as a core material stored in the cover member of the present invention, for example, a laminate in which low-resilience urethane foam / high-density urethane foam is laminated in sequence, or low-resilience urethane foam / high-density urethane foam / low-resilience urethane foam And the like are laminated.

Thus, by using a core material having a low-resilience urethane foam layer formed on the surface, body pressure dispersion is achieved, which is effective in preventing pressure ulcers and the like.
Here, as the low resilience urethane foam, the resilience elastic modulus (measured value obtained by measuring the percentage of the drop distance (460 mm) by dropping the steel ball from the distance of 460 mm on the test piece) is 2 to 20. % Urethane foam is preferred. This is because if it is less than 2%, the production is difficult, and if it exceeds 20%, the effect of preventing pressure ulcer is reduced.
The high density urethane foam preferably has a density of about 30 to 75 kg / m ³ , a hardness of about 120 to 200 N, and a rebound resilience of 30% or more. This is because if the density is too high or the hardness is too hard, the cushioning properties will be impaired, and if the density is too low or the hardness is too soft, there will be a feeling of bottoming, and if the rebound elastic modulus is too high, If the feeling is lost and the rebound resilience is too low, the sinking into the mattress increases and the sleeping comfort becomes worse.
At this time, as the high-density urethane foam, a foam material in which a urethane chip such as an end material is cut into a predetermined size and integrated with an adhesive or the like is applicable.

The urethane layer on the surface of the cover member prevents perspiration, excrement, body fluids, dirt, etc. from penetrating into the mattress, and the cover member stretches following the deformation of the core material, maintaining body pressure dispersibility. Is done. Moreover, pressure ulcers can be effectively prevented by setting the friction coefficient within a predetermined range.
And, by making the urethane layer of the cover member polycarbonate-based urethane, it will be resistant to tearing and so on, and it will be able to improve durability, and even if the surface is soiled with body fluid etc., it will be washed with water, warm water or neutral detergent After cleaning, it can be easily disinfected by wiping with rubbing alcohol.

  In addition, when a cover member is used for a mattress or the like, if a non-slip material is provided on the cover member that becomes the bottom surface of the mattress or the like, it is difficult to slip from the wheelchair, for example, when applied as a cushion material for a wheelchair or the like. It is easy to use.

Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is an explanatory view of a mattress in which a cover member according to the present invention is used, FIG. 2 is a cross-sectional view of the cover member, FIG. 3 is a cross-sectional view of a core member, and FIG. .

  The cover member such as a mattress according to the present invention prevents perspiration, excrement, body fluid, dirt, etc. from penetrating into the mattress and becomes unsanitary, and without impairing the body pressure dispersion effect of the core material. It is configured as an effective cover member for pressure ulcer prevention, and is particularly suitable for use as a mattress in a hospital or a nursing facility, or a cushion material for a wheelchair.

That is, as shown in FIG. 1, the mattress 1 includes a core material 2 made of a soft urethane foam material and a cover member 3 that detachably covers the periphery of the core material 2. While being configured as a dispersion type, the cover member 3 does not impair the body pressure dispersibility of the core material 2, and even if used by a bedridden person, sweat, excrement, body fluid, filth, etc. are the core material Consideration is given so that it does not penetrate into the interior of 2 and become unsanitary.
And the cover member 3 shall have the urethane layer 5 laminated | stacked on the surface of the fiber cloth 4, as shown in FIG.

  The fiber cloth 4 can be a woven or knitted fabric of natural fibers or synthetic fibers. In this embodiment, synthetic fibers are used and the elongation at break according to JIS K 6772 is in the vertical direction. 80 to 150% and 150 to 250% in the horizontal direction.

  The urethane layer 5 is laminated on the surface of the fiber cloth 4 and is made of polycarbonate urethane in this embodiment. And such a polycarbonate-type urethane can be obtained by reaction of such a polyol component and an isocyanate component, using a polycarbonate polyol as a polymer polyol component which comprises a polyurethane component.

  Examples of the low molecular weight glycol used in the synthesis of the polycarbonate polyol include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, and 2,2-diethyl- 1,3-propanediol, 1,3-butylene glycol, 1,4-butanediol, 2-methyl-1,4-hexamethylene glycol, 3-methyl-1,5-pentanediol, 1,6-hexane Diol, 1,8-octanediol, 2-methyl-1,8-octanediol, 2,7-dimethyl-1,8-octanediol, 1,9-nonanediol, 2,8-dimethyl-1,9- Nonanediol, 1,10-decanediol, and other carbon-based fatty acid geo acids of about 2 to 15 Le; 1,4-cyclohexanediol, cyclohexanedimethanol, alicyclic diols such as dimethyl cyclooctane diol; and 1,4 Biz (beta-hydroxyethoxy) aromatic dihydric alcohols such as benzene can be exemplified.

  These diols may be used alone or in combination of two or more. Furthermore, you may use the polyol compound which has a trifunctional or more than trifunctional hydroxyl group with these diols. Examples of such a polyol compound include glycerin, trimethylolethane, trimethylolpropane, trimethylolbutane, butanetriol, hexanetriol, pentaerythrulol and the like. These polyol compounds may be used alone or in combination of two or more.

On the other hand, the isocyanate compound is not particularly limited, and any of known aliphatic, alicyclic, and aromatic organic diisocyanates having an isocyanate group in a molecule conventionally used in the production of polyurethane. Can be used.
Examples of such isocyanate compounds include toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, isophorone diisocyanate, tolylene diisocyanate, p-phenylene diisocyanate, 1,5-naphthalene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, 4,4. Examples include '-dicyclohexylmethane diisocyanate, 3,3'-dichloro-4,4'-diphenylmethane diisocyanate, and hydrogenated xylylene diisocyanate. These organic isocyanate compounds may be used alone or in combination of two or more.

In this embodiment, an inorganic antibacterial agent such as silver or an organic antibacterial agent such as phosphate is added to such polycarbonate urethane.
Moreover, it is also possible to mix | blend another additive as needed.

The urethane solution obtained by the reaction of the polycarbonate polyol and the isocyanate compound may be directly applied to the surface of the fiber cloth 4 with a roll coater or the like to form the urethane layer 5. Or the like, and the film may be welded to the fiber cloth 4 by frame lamination or the like.
Incidentally, in this embodiment, productivity is improved by welding a polycarbonate urethane film in the form of a film.
At this time, the static friction coefficient according to JIS K 7125 on the urethane layer surface is set to 0.6 to 0.8, and the dynamic friction coefficient is set to 0.5 to 0.7.

  On the other hand, as shown in FIG. 3, the core material 2 has a body pressure dispersion in which three layers of an upper low-rebound urethane foam layer 6, an intermediate high-density urethane foam layer 7, and a lower low-repulsion urethane foam 8 are laminated. The mold core 2 is used.

The low resilience urethane foam layer 6 has a resilience modulus of urethane foam of about 2 to 20%, and more preferably a density of about 40 to 90 kg / m ³ . This is because if the density is less than 40 kg / m ³ , the body sinks quickly and the sleeping comfort may deteriorate, and if the density exceeds 90 kg / m ³ , the body sinks slowly and the sleeping posture is stabilized. This is because it tends to take time.

The high density urethane foam layer 7 has a urethane foam density of about ³⁰ to 75 kg / m ³ and a hardness of about 120 to 200 N in order to prevent a feeling of bottoming and obtain a cushioning property and a soft feeling. The elastic modulus is 30% or more.
In the present embodiment, as the high-density urethane foam layer 7, a foam material in which urethane chips such as end materials are cut into a predetermined size and integrated with an adhesive or the like is used. This is because foam materials such as urethane chips cut into a certain size and integrated are superior in durability and difficult to sag, and because the hardness is appropriate, there is no feeling of bottoming and cushioning Is also good.
In the mattress 1 of the present embodiment, the upper and lower low-resilience urethane foam layers 6 and 8 are each 20 mm thick, and the middle high-density urethane foam layer 7 is 40 mm thick.

  As a method of laminating the urethane foam layers 6, 7, and 8, an adhesive laminate, a frame laminate, a thermal laminate, or the like can be used. In the case of a laminate using an adhesive, it is water-based in terms of environment and safety. It is preferable to use an emulsion adhesive.

In the mattress 1 configured by covering the periphery of the core material 2 with a cover member 3 that is detachable with a fastener or the like, the cover member 3 follows the low-resilience urethane foam layer 6 on the front side of the core material 2. Since it has elongation and flexibility, body pressure dispersibility is not impaired, and the urethane layer 5 of the cover member 3 prevents permeation of sweat, excrement, body fluid, dirt, etc. into the inside of the mattress. Is done. Further, the mattress 1 is less likely to cause pressure ulcers due to a friction coefficient within a predetermined range on the surface of the urethane layer 5.
Further, when the dirt is severe, it is hygienic because the cover member 3 can be removed and washed.
Furthermore, the polycarbonate-based urethane of the urethane layer 5 is difficult to hydrolyze and has excellent tear strength, so that it is possible to prevent the generation of scratches on the surface, and the deterioration due to higher fatty acids contained in sebum hardly occurs, so that the durability is improved. It is illustrated.

Incidentally, FIG. 4A is an explanatory view showing an example in which an anti-slip material 11 is sewn on the bottom surface of the cover member 3 in the cushion material 10 for a wheelchair having the same configuration as the mattress 1.
In this embodiment, as shown in FIG. 4B, the anti-slip material 11 is formed by dot processing or the like on the portion of the cover member 3 that becomes the bottom surface of the mattress or the like when the cover member 3 is used for a mattress or the like. A large number of resin-made convex portions 13 are formed, and the cushion material 10 and the floor surface that supports the cushion material 10 are less likely to slip by sewing with the convex portion 13 forming side facing the back side. It is a thing.
Incidentally, the core material 2 in the case of the cushion material 10 has a two-layer structure of an upper layer low-resilience urethane foam layer and a lower layer high-density urethane foam layer. In this embodiment, the thickness of the upper low-resilience urethane foam layer is The thickness of the lower density high-density urethane foam layer is about 20 mm.

The present invention is not limited to the above embodiment. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the shape and thickness of the mattress 1 and the cushion material 10 are examples. Also, the purpose of use of the cushion material is arbitrary.

  As a core material for mattresses and cushioning materials, at least the upper layer has a soft urethane laminate structure including a low-resilience urethane foam layer, the periphery of which is covered with a cover member, and a fiber cloth having a predetermined elongation as the cover member By forming a polycarbonate-based urethane layer on the surface of this layer and setting the coefficient of friction of the urethane layer surface to a predetermined range, bedridden people can be prevented from becoming pressure ulcers (floor rubbing), and sweat and excrement And body fluids and filth are prevented from penetrating into the mattress and becoming unsanitary. For this reason, it is suitable for a mattress used in a hospital or a nursing facility, a cushion material for a wheelchair, or the like.

Explanatory drawing of the mattress in which the cover member concerning the present invention is used Cross section of cover member Cross section of core material It is explanatory drawing of the cushioning material for wheelchairs, (a) is a general view, (b) is the back view of a non-slip material

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mattress, 2 ... Core material, 3 ... Cover member, 4 ... Fiber cloth, 5 ... Urethane layer, 10 ... Cushion material, 11 ... Anti-slip material.

Claims (3)

A cover member configured to cover at least a surface in contact with a human body around a core material made of flexible urethane foam, and the cover member is formed by laminating a urethane layer on a surface of a stretchable fiber cloth. The elongation at break of the fiber cloth according to JIS K 6972 is 80 to 150% in the vertical direction and 150 to 250% in the horizontal direction, and the coefficient of static friction according to JIS K 7125 on the surface of the urethane layer is 0. A cover member such as a mattress characterized by having a coefficient of dynamic friction of 6 to 0.8 and a dynamic friction coefficient of 0.5 to 0.7. 2. The cover member for a mattress or the like according to claim 1, wherein the urethane layer of the cover member is polycarbonate urethane. The mattress or the like according to claim 1 or 2, wherein when the cover member is used for a mattress or the like, an anti-slip material is disposed on a portion of the cover member that becomes a bottom surface of the mattress or the like. Cover member.

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