阅读说明：本技术 护理床 (Nursing bed ) 是由 高冈佳久 于 2018-09-26 设计创作，主要内容包括：本发明的目的在于使具有由热塑性树脂形成的三维网状构造体的护理床应对床主体的复杂的动作、使用者的特定的动作而顺利地多阶段性弯曲。三维网状构造体(101)具有沿挤压方向(Y)反复设置稀疏的构成单元(1a<Sub>1</Sub>～1a<Sub>9</Sub>)和紧密的构成单元(1b<Sub>1</Sub>～1b<Sub>8</Sub>)的第一立体疏密构造(1),在该第一立体疏密构造(1)中,稀疏的构成单元(1a<Sub>1</Sub>～1a<Sub>9</Sub>)的体积密度δ<Sub>1</Sub>是0.01～0.08g/cm<Sup>3</Sup>,紧密的构成单元(1b<Sub>1</Sub>～1b<Sub>8</Sub>)的体积密度δ<Sub>2</Sub>是0.03～0.10g/cm<Sup>3</Sup>,紧密的构成单元(1b<Sub>1</Sub>～1b<Sub>8</Sub>)相对于稀疏的构成单元(1a<Sub>1</Sub>～1a<Sub>9</Sub>)的体积密度的比例δ<Sub>2</Sub>/δ<Sub>1</Sub>是1.01～5,稀疏的构成单元(1a<Sub>1</Sub>～1a<Sub>9</Sub>)的长度A<Sub>1</Sub>是1～50cm,紧密的构成单元(1b<Sub>1</Sub>～1b<Sub>8</Sub>)的长度A<Sub>2</Sub>是3～60cm,紧密的构成单元(1b<Sub>1</Sub>～1b<Sub>8</Sub>)相对于稀疏的构成单元(1a<Sub>1</Sub>～1a<Sub>9</Sub>)的长度的比例A<Sub>2</Sub>/A<Sub>1</Sub>是0.1～10。(The purpose of the present invention is to smoothly bend a nursing bed having a three-dimensional network structure formed of a thermoplastic resin in multiple stages in response to a complicated operation of a bed main body and a specific operation of a user. The three-dimensional net structure (101) has a constituent unit (1 a) repeatedly arranged sparsely in the extrusion direction (Y) 1 ～1a 9 ) And compact constituent units (1 b) 1 ～1b 8 ) In the first three-dimensional dense-dense structure (1), the sparse constituent units (1 a) in the first three-dimensional dense-dense structure (1) 1 ～1a 9 ) Volume density delta of 1 Is 0.01 to 0.08g/cm 3 Compact form sheetElement (1 b) 1 ～1b 8 ) Volume density delta of 2 Is 0.03 to 0.10g/cm 3 Compact constituent unit (1 b) 1 ～1b 8 ) Relative to sparse constituent unit (1 a) 1 ～1a 9 ) Volume density ratio delta of 2 /δ 1 1.01 to 5, sparse constituent units (1 a) 1 ～1a 9 ) Length A of 1 Is a compact constituent unit (1 b) of 1 to 50cm 1 ～1b 8 ) Length A of 2 Is a compact 3-60 cm unit (1 b) 1 ～1b 8 ) Relative to sparse constituent unit (1 a) 1 ～1a 9 ) Ratio A of length of 2 /A 1 Is 0.1 to 10.)

1. A nursing bed is characterized in that a nursing bed body is provided with a bed body,

Comprises a three-dimensional net-like structure,

The three-dimensional network structure has a curled spring structure obtained by irregularly winding filaments of a thermoplastic resin in contact with each other at joints,

to the three-dimensional network structureThe diameter of the filament is 0.1 to 2.0mm, and the bulk density is 0.01 to 0.15g/cm³，

The three-dimensional network structure has a first three-dimensional dense-dense structure formed by repeatedly arranging sparse constituent units and dense constituent units in an extrusion direction,

In the first three-dimensional density structure, the volume density of the sparse constituent unit is 0.01 to 0.08g/cm³The compact constituent unit has a bulk density of 0.03 to 0.10g/cm³Wherein the ratio of the bulk density of the compact constituent unit to the bulk density of the sparse constituent unit is 1.01 to 5, the length of the sparse constituent unit in the extrusion direction is 1 to 50cm, the length of the compact constituent unit in the extrusion direction is 3 to 60cm, and the ratio of the lengths is 0.1 to 10,

The three-dimensional network structure has a second three-dimensional dense-dense structure formed by arranging sparse constituent units and dense constituent units in the thickness direction,

In the second three-dimensional density structure, the volume density of the sparse constituent unit is 0.01 to 0.08g/cm³The compact constituent unit has a bulk density of 0.03 to 0.10g/cm³Wherein the ratio of the bulk density of the compact constituent unit to the sparse constituent unit is 1.01 to 5, the thickness of the sparse constituent unit is 0.5 to 10cm, the thickness of the compact constituent unit is 2 to 30cm, and the ratio of the thickness of the compact constituent unit to the sparse constituent unit is 0.2 to 60,

The three-dimensional network structure has a plurality of intersecting solid regions formed by sparse constituent units with each other by the first three-dimensional dense-dense structure and the second three-dimensional dense-dense structure.

2. A care bed as set forth in claim 1,

In the second three-dimensional dense-dense structure, the compact constituent units are provided on a surface layer.

3. A care bed as set forth in claim 1,

In the second three-dimensional dense-dense structure, the dense constituent elements are provided in the intermediate layer, and the sparse constituent elements are provided in the surface layer.

4. A care bed according to any one of claims 1 to 3,

A third three-dimensional dense-dense structure formed by repeatedly arranging sparse constituent units and dense constituent units in a direction orthogonal to the extrusion direction,

in the third three-dimensional dense-dense structure, the bulk density of the sparse constituent unit is 0.009-0.08 g/cm³the compact constituent unit has a bulk density of 0.0128 to 0.10g/cm³The ratio of the bulk density of the dense constituent elements to the bulk density of the sparse constituent elements is 1.01 to 10, the width of the sparse constituent elements is 40 to 100cm, the width of the dense constituent elements is 4 to 30cm, and the ratio of the width of the dense constituent elements to the width of the sparse constituent elements is 0.02 to 30.

Technical Field

The present invention relates to a nursing bed having a three-dimensional mesh structure.

Background

In recent years, technical development of motor-driven nursing beds has progressed, and nursing beds having a part or all of three functions of a back-lifting function, a height-adjusting function, and a knee-lifting function are mainly sold. The nursing bed is driven by a motor, and a single-motor bed, a double-motor bed, a three-motor bed, a four-motor bed, and the like are sold as kinds of the nursing bed, and functions are different depending on the number of motors mounted on the bed. Recently, a nursing bed having a large number of motors and capable of performing deformation in multiple stages is desired.

The inventions of patent documents 1 to 4 are proposed for a three-dimensional structure used in such a nursing bed.

The invention disclosed in patent document 1 is directed to achieving a seamless structure of a mattress for a bed, eliminating displacement between the mattresses and a step between the mattresses, and achieving weight reduction, and proposes a mattress for a bed having a spring structure, wherein a three-dimensional net structure of a spring structure comprising continuous hollow threads or solid threads which are wound around each other in a random manner in a ring shape by extrusion molding and are locally heat-bonded is made of a thermoplastic resin as a raw material or a main raw material, a plurality of continuous grooves penetrating from a lower surface of the three-dimensional net structure toward an upper surface thereof in a short-side direction are formed at predetermined or appropriate intervals along a longitudinal direction, and the grooves are expanded when the three-dimensional net structure is bent upward.

The invention disclosed in patent document 2 is for providing an intermediate material for a mattress having excellent adhesiveness and a mattress using the same, and is characterized in that the intermediate material for a mattress is a laminate obtained by laminating a plurality of layers each composed of a three-dimensional network structure, and each layer composed of the three-dimensional network structure is fixed continuously or intermittently at one end of the laminate, and the other end is not fixed.

The invention disclosed in patent document 3 is intended to smoothly bend a three-dimensional net structure made of a thermoplastic resin, is made of polyethylene dependent on the expansion ratio with respect to the shearing speed, has a curled spring structure obtained by irregularly winding filaments in contact with each other, has a three-dimensional striped dense structure in the transverse direction with respect to the extrusion direction, and has a filament diameter of 0.2 to 1.3mm and a bulk density of 0.01 to 0.2g/cm³The three-dimensional network structure of (1) having a pipe inner diameter D at a temperature of 190 ℃ from the temperature₁Extruding the molten polyethylene through a capillary having a diameter of 1.0mm and a length of 10mm, and cooling the extruded filaments of the polyethylene so that the diameter of the cross-sectional area of the filaments is D₂When the expansion ratio is D relative to the shearing speed₂/D₁And (4) showing.

The invention disclosed in patent document 4 is intended to smoothly bend a three-dimensional net structure made of a thermoplastic resin, is made of a polyester which depends on the expansion ratio with respect to the shearing speed, has a curled spring structure obtained by irregularly winding filaments in contact with each other, has a three-dimensional striped dense structure in the transverse direction with respect to the extrusion direction, and has a filament diameter of 0.2 to 1.3mm and a bulk density of 0.01 to 0.2g/cm³At a temperature of 210 ℃ and a pipe inner diameter D₁Extruding the molten polyester through a capillary having a diameter of 1.0mm and a length of 10mm, and cooling the filaments of the extruded polyester so that the filaments have a cross-sectional area D₂When the expansion ratio is D relative to the shearing speed₂/D₁And (4) showing.

Patent document 1: japanese laid-open patent publication No. 2006-6924

Patent document 2: japanese laid-open patent publication No. 2008-295824

Patent document 3: international publication WO2013/088736

Patent document 4: international publication WO2013/088737

However, in recent years, medical and general mattresses have not only performed simple back lifting, but also performed complicated operations in the back and feet of a user, or during meals and the like using three or more motors, and thus, it has been shown that the three-dimensional mesh structures up to now cannot cope with complicated operations. In particular, in order to prevent the occurrence of misdiagnosis pneumonia and the like, it is necessary to support the human body at a specific angle, and it is necessary that the three-dimensional mesh structure smoothly slide in the longitudinal and lateral directions and follow the movement of the bed main body.

In patent document 1, the mattress for a bed needs to be partially cut at a plurality of stages, and the bending characteristics are not sufficiently harmonized. In patent documents 2 to 4, the performance of conforming to the complicated operation of the bed main body and the performance of smoothly bending the mattress in multiple stages are not sufficient, and there is a problem that a gap is generated between the drive base plate of the nursing bed and the mattress and the conformance is caused. For a nursing bed using a plurality of motors to complicatedly drive a driving bottom plate, a mattress suitable for the nursing bed is urgently desired.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a nursing bed having a three-dimensional network structure formed of a thermoplastic resin, which can cope with complicated movements of a bed body by a motor and specific movements of a user, and which can improve the follow-up performance to the nursing bed.

The present invention is a nursing bed, characterized in that the nursing bed is provided with a three-dimensional reticular structure, the three-dimensional reticular structure is provided with a curled spring structure obtained by irregularly contacting and winding filaments of thermoplastic resin at a joint, the diameter of the filaments in the three-dimensional reticular structure is phi 0.1-2.0 mm, and the volume density is 0.01-0.15 g/cm³The three-dimensional net structure has a structure in which sparse constituent units and dense constituent units are repeatedly arranged in the extrusion directionA first three-dimensional dense-dense structure of a unit, in which a volume density δ of the sparse constituent unit is₁Is 0.01 to 0.08g/cm³Bulk density δ of the above-mentioned compact constituent units₂Is 0.03 to 0.10g/cm³A ratio δ of a bulk density of the dense constituent unit to a bulk density of the sparse constituent unit₂/δ₁1.01 to 5, preferably 1.03 to 4, particularly preferably 1.05 to 3, and the length A of the sparse constituent unit in the extrusion direction₁1 to 50cm, preferably 1 to 30cm, the length A of the compact constituent unit in the extrusion direction₂Is 3 to 60cm, preferably 3 to 30cm, and has a length ratio A₂/A₁0.1 to 10, preferably 0.2 to 8, particularly preferably 0.5 to 5, and the three-dimensional network structure has a second three-dimensional dense structure in which sparse constituent units and dense constituent units are arranged in the thickness direction, and the volume density δ of the sparse constituent units in the second three-dimensional dense structure₃Is 0.01 to 0.08g/cm³Bulk density δ of the above-mentioned compact constituent units₄Is 0.03 to 0.10g/cm³A ratio δ of the bulk density of the dense constituent unit to the sparse constituent unit₄/δ₃1.01 to 5, preferably 1.1 to 4, particularly preferably 1.15 to 2, the thickness of the sparse constituent unit is 0.5 to 10cm, the thickness of the dense constituent unit is 2 to 30cm, the ratio of the thickness of the dense constituent unit to the thickness of the sparse constituent unit is 0.2 to 60, and the three-dimensional network structure has a plurality of intersecting three-dimensional regions formed by the sparse constituent units via the first three-dimensional dense-dense structure and the second three-dimensional dense-dense structure.

In the second three-dimensional dense-dense structure of the present invention, the compact constituent units are provided on a surface layer.

In the second three-dimensional dense-dense structure, the dense constituent elements are provided in the intermediate layer, and the sparse constituent elements are provided in the surface layer.

The present invention has a structure in which the pressing direction is repeated in a direction orthogonal to the pressing directionA third three-dimensional dense-dense structure in which sparse constituent elements and dense constituent elements are arranged, and the volume density δ of the sparse constituent elements is₅Is 0.009-0.08 g/cm³Bulk density δ of the above-mentioned compact constituent units₆Is 0.0128 to 0.10g/cm³The ratio of the bulk density of the dense constituent elements to the bulk density of the sparse constituent elements is 1.01 to 10, preferably 1.01 to 5, particularly preferably 1.03 to 4, and further preferably 1.05 to 3, the width of the sparse constituent elements is 40 to 100cm, the width of the dense constituent elements is 4 to 30cm, and the ratio of the width of the dense constituent elements to the width of the sparse constituent elements is 0.02 to 30.

Examples of the thermoplastic resin include Polyethylene (PE), polypropylene (PP), and polyester thermoplastic elastomers (TPEE, TPC). In addition, those obtained by blending the above-mentioned raw materials with an elastomer having compatibility with olefins and propylene are also used. The material has high transparency, and stains attached to the mattress middle material can be easily found. In addition, the elasticity can be adjusted by changing the mixing ratio.

The hysteresis loss of the three-dimensional network structure is 20 to 80%.

When polyethylene is used, specific examples thereof include general polyethylene, Linear Low Density Polyethylene (LLDPE), and very low density polyethylene (VLPE). The density of the polyethylene raw material is preferably 0.82-0.95 g/cm³More preferably 0.85 to 0.94g/cm³。

When a polyester is used, a three-dimensional network structure of a polyester block copolymer (a) mainly composed of a high-melting crystalline polymer segment (a) mainly composed of a crystalline aromatic polyester unit, a main aliphatic polyether unit, and/or a low-melting polymer segment (b) mainly composed of an aliphatic polyester unit is exemplified.

As the thermoplastic resin, thermoplastic resins having expansion ratios in specific ranges described in patent documents 3 and 4 can be used.

The filaments may be solid or hollow.

The present invention has a plurality of intersecting three-dimensional regions formed by the sparse constituent units in the first three-dimensional dense-dense structure and the second three-dimensional dense-dense structure, and therefore, the follow-up performance to the care bed whose floor is driven by the motor can be improved. The clearance between the drive floor of the nursing bed and the bottom surface of the three-dimensional mesh structure is reduced with respect to the back lifting operation of the nursing bed. The density of the three-dimensional mesh structure can be adjusted according to the style of the nursing bed, and therefore, the three-dimensional mesh structure can be used in not only a general nursing bed but also a hospital.

The present invention has a plurality of intersecting three-dimensional regions formed by the sparse constituent units in the first three-dimensional dense-dense structure, the second three-dimensional dense-dense structure, and the third three-dimensional dense-dense structure, and therefore, the follow-up performance of the nursing bed with the base plate driven by the motor is improved, and the restriction on the movement of the human body to the left and right is improved.

Drawings

Fig. 1 is a perspective view of a three-dimensional mesh structure of a nursing bed according to a first embodiment of the present invention.

FIG. 2 is a perspective view (showing dimension marks) of the three-dimensional network structure.

Fig. 3 is an exploded perspective view showing a first three-dimensional density structure of the three-dimensional network structure.

Fig. 4 is an exploded perspective view showing a second three-dimensional density structure of the three-dimensional network structure.

Fig. 5 is a perspective view of a three-dimensional mesh structure of a nursing bed according to a second embodiment of the present invention.

Fig. 6 is a front view of a three-dimensional mesh structure as a modified form of the nursing bed.

Fig. 7 is a perspective view of a three-dimensional mesh structure of a nursing bed according to a third embodiment of the present invention.

FIG. 8 is a perspective view (showing dimension marks) of the three-dimensional network structure.

Fig. 9 is an exploded perspective view showing a first three-dimensional density structure of the three-dimensional network structure.

Fig. 10 is an exploded perspective view showing a second three-dimensional density structure of the three-dimensional network structure.

Fig. 11 is an exploded perspective view showing a third three-dimensional density structure of the three-dimensional network structure.

Fig. 12 is a perspective view of a three-dimensional mesh structure of a nursing bed according to a fourth embodiment of the present invention.

FIG. 13 is a perspective view (showing dimension marks) of the three-dimensional network structure.

Fig. 14 is an exploded perspective view showing a first three-dimensional density structure of the three-dimensional network structure.

fig. 15 is an exploded perspective view showing a second three-dimensional density structure of the three-dimensional network structure.

Fig. 16 is an exploded perspective view showing a third three-dimensional density structure of the three-dimensional network structure.

Fig. 17 is a perspective view showing a state of use of a three-dimensional mesh structure of a nursing bed according to a fourth embodiment of the present invention.

Detailed Description

The three-dimensional mesh structure 101 according to the first embodiment is applied as an intermediate material of a mattress of a nursing bed. The three-dimensional net structure 101 has a spring structure in a curled shape obtained by irregularly winding filaments of a thermoplastic resin in contact with each other at joints, wherein the filaments have a diameter of 0.1 to 2.0mm and a bulk density of 0.01 to 0.15g/cm³. The three-dimensional mesh structure 101 has a width M of 60 to 200cm, a length L of 90 to 220cm, and a thickness of 10 to 100 cm.

As shown in FIGS. 1 to 4, the three-dimensional network structure 101 has a constituent unit 1a formed by repeating sparse rows in the extrusion direction Y₁～1a₉And compact constituent unit 1b₁～1b₈The first three-dimensional dense-dense structure 1, wherein the sparse constituent units 1a in the first three-dimensional dense-dense structure 1₁～1a₉Volume density delta of₁Is 0.01 to 0.08g/cm³compact constituent unit 1b₁～1b₈Volume density delta of₂Is 0.03 to 0.10g/cm³Compact constituent unit 1b₁～1b₈With respect to sparse constituent unit 1a₁～1a₉Volume density ratio delta of₂/δ₁1.01 to 5, sparse constituent unit 1a₁～1a₉Length A of₁1-30 cm, compact constituent unit 1b₁～1b₈Length A of₂Is a compact 3-30 cm unit 1b₁～1b₈With respect to sparse constituent unit 1a₁～1a₉Ratio A of length of₂/A₁Is 0.5 to 3.

As shown in FIGS. 1 to 4, the three-dimensional mesh structure 101 includes a sparse component 2c and a dense component 2d repeatedly arranged in the thickness direction Z₁、2d₂When the second three-dimensional dense-dense structure 2 is applied to an intermediate material of a nursing bed, the second three-dimensional dense-dense structure 2 has a bulk density of sparse constituent elements of 0.01 to 0.08g/cm³Bulk density δ of compact constituent units₄Is 0.03 to 0.10g/cm³The ratio δ of the bulk density of the compact constituent units to the sparse constituent units₄/δ₃1.01 to 5, preferably 1.1 to 4, particularly preferably 1.15 to 2, the thickness of the sparse constituent unit is 0.5 to 10cm, the thickness of the dense constituent unit is 2 to 30cm, and the ratio B of the thickness of the dense constituent unit 2d to the thickness of each sparse constituent unit is₂/B₁Is 0.2 to 60. Since the first three-dimensional dense-dense structure and the second three-dimensional dense-dense structure include the three-dimensional mesh structure having the plurality of intersecting three-dimensional regions formed by the sparse constituent units, the three-dimensional mesh structure 101 has high followability to the driving floor of the nursing bed.

As shown in fig. 4, the three-dimensional mesh structure 101 includes a plurality of regions 4a having a low volume density among the intersecting three-dimensional regions 4 having a small volume density, the regions being formed by the sparse constituent units of the first three-dimensional dense-and-dense structure 1 and the second three-dimensional dense-and-dense structure 2₁～4a₉The volume density of the region is smaller than that of the constituent unit 2d₁、2d₂and a plurality of sparse intersected stereo regions 4, wherein each sparse intersected stereo region 4 is divided into a plurality of regions 4a₁～4a₉Clamped region 4b₁～4b₈. The above is the case of 3 layers, but the present invention can also be applied to a case where the density is two layersThe case (2) can also be applied to a case of 4 layers or more.

For details of the method for producing the three-dimensional network structure, reference is made to japanese patent No. 4350286, U.S. patent nos. 7, 625, 629 and other patent application publications. The first three-dimensional density structure is basically formed by making the speed of the roller or the crawler variable. In addition, the second three-dimensional dense-sparse structure and the third three-dimensional dense-sparse structure are formed by adjusting the density of the number and/or the size of the diameter of the holes of the die in a unit area.

The three-dimensional mesh structure 201 of the nursing bed according to the second embodiment will be described with reference to fig. 5. Since the three-dimensional mesh structure 201 basically has the same configuration as the three-dimensional mesh structure 101, the common description will be given with reference to the drawings and description of the first embodiment, and the differences will be described. In the second embodiment, the sparse constituent elements 2c and the dense constituent elements 2d of the second three-dimensional dense-dense structure 2 of the first embodiment are respectively designated₁、2d₂The structural unit 2c, in which the position in the thickness direction Z is changed to be sparse₁、2c₂The dense constituent units 2d are replaced with dense ones. In the second embodiment, the dense constituent unit 2d is an intermediate layer, and the sparse constituent unit 2c is provided on the surface layer side₁、2c₂. Structural unit 2c to be thinned₁、2c₂The surface layer is used for improving the follow-up property of the nursing bed. The dense constituent element 2d serving as the intermediate layer prevents the sparse constituent element 2c from being sparse₁The separation of the welded part of the filaments and the improvement of the follow-up property to the nursing bed.

as shown in FIG. 5, the three-dimensional network structure 201 has constituent units 2c sparsely arranged in the thickness direction Z₁、2c₂And a second three-dimensional dense-dense structure 2 of dense constituent elements 2d, in which second three-dimensional dense-dense structure 2 the volume density δ of the sparse constituent element 2c₃Is 0.01 to 0.08g/cm³Bulk density δ of compact constituent unit 2d₄Is 0.03 to 0.10g/cm³The dense constituent unit 2d is opposite to the sparse constituent unit 2c₁、2c₂Volume density ratio delta of₄/δ₃1.01 to 5, preferably 1.1 to 4, particularly preferably 1.15 to 2, sparse constituent unit 2c₁、2c₂Thickness B of₁Is 0.5 to 10cm, and has a thickness B of the compact constituent unit 2d₂2-30 cm, the compact constituent unit 2d is relative to the sparse constituent units 2c₁、2c₂A ratio B of thicknesses of the respective constituent units₂/B₁Is 0.2 to 60. Since the surface layer side is sparsely structured and the intermediate layer is densely structured, the three-dimensional mesh structure 101 is easily bent within a range of an appropriate volume density. While the case of 3 layers has been described above, the present invention can be applied to a case where the density is two layers, and can also be applied to a case where the density is 4 layers or more.

As shown in FIG. 6, a three-dimensional mesh structure 201' as a modified form of the three-dimensional mesh structure 201 according to the second embodiment is formed into a high-density layer in which dense constituent units 2d are respectively included on the upper surface and the lower surface of the dense constituent unit 2d in order to improve the follow-up property to the nursing bed₁、2d₂Is arranged and constitutes the unit 2d₁、2d₂Has a higher bulk density than the constituted unit 2d₁、2d₂The bulk density of the intermediate layer sandwiched above and below. Constituent Unit 2d₁、2d₂May be provided on both sides of the compact constituent unit 2d, or may be provided only on one side.

A three-dimensional mesh structure 301 of a nursing bed according to a third embodiment will be described with reference to fig. 7 to 11. Since the three-dimensional mesh structure 301 basically has the same configuration as the three-dimensional mesh structure 201, the common description will be given with reference to the drawings and description of the second embodiment, and the differences will be described. The difference is that the third three-dimensional dense-dense structure 3 is additionally formed in the three-dimensional mesh structure of the second embodiment. Here, the second embodiment is used as a basis, but the present invention can also be applied to the first embodiment. The third three-dimensional dense-and-dense structure is provided by changing the aperture of the nozzle hole of the mold and/or increasing or decreasing the number of holes along the X direction.

The three-dimensional network structure 301 has a sparse constituent unit 3e and a dense constituent unit 3f repeatedly arranged in a direction X orthogonal to the extrusion direction Y₁、3f₂The third three-dimensional dense-dense structure 3. In the third three-dimensional dense-dense structure 3, the bulk density δ of the sparse constituent element 3e₅Is 0.009-0.08 g/cm³Compact constituent unit 3f₁、3f₂Volume density delta of₆Is 0.0128 to 0.10g/cm³Compact constituent unit 3f₁、3f₂Relative to the bulk density δ of the sparse constituent unit 3e₅Ratio delta of₆/δ₅1.01 to 5, preferably 1.03 to 4, 1.05 to 3. Width C of sparse constituent unit 3e₁Is 40-100 cm, compact, and has a unit 3f₁、3f₂Each width C of₂4-30 cm, each compact constituent unit 3f₁、3f₂Ratio C to width of sparse constituent unit 3e₂/C₁Is 0.02 to 30.

In addition to improving the following performance to the nursing bed, the three-dimensional mesh structure 301 can also restrain the lateral movement of the human body by sandwiching the human body from both sides.

A three-dimensional mesh structure 401 of a nursing bed according to a fourth embodiment will be described with reference to fig. 12 to 17. Since the three-dimensional mesh structure 401 basically has the same configuration as the three-dimensional mesh structure 301, the common description will be given with reference to the drawings and description of the third embodiment, and the differences will be described. The difference is that another structure with sparse structure is added to the third three-dimensional dense-dense structure 3 of the three-dimensional mesh structure according to the third embodiment. Here, the third embodiment is used as a basis, but it is needless to say that the present invention can be applied to the first embodiment.

the three-dimensional network structure 401 has a constituent unit 3e repeatedly arranged sparsely in a direction X orthogonal to the extrusion direction Y₁、3e₂、3e₃And compact constituent unit 3f₁、3f₂The third three-dimensional dense-dense structure 3. In the third three-dimensional dense-dense structure 3, the sparse constituent element 3e₁、3e₂、3e₃Volume density delta of₅Is 0.009-0.07 g/cm³Compact constituent unit 3f₁、3f₂Volume density delta of₆Is 0.0128 to 0.09g/cm³Sparse constituent unit 3e₁、3e₂Is set to be smaller than the sparse constituent unit 3e₃The bulk density of (a). Compact constituent unit 3f₁、3f₂Volume density delta of₆With respect to sparse constituent unit 3e₁、3e₂、3e₃Volume density delta of₅Ratio delta of₆/δ₅1.01 to 5, preferably 1.03 to 4, 1.05 to 3. Sparse constituent unit 3e₁、3e₂、3e₃Total width C of₁40 to 100cm, sparse constituent unit 3e₁、3e₂Constituent element 3e set to be sparser₃Stenosis. Compact constituent unit 3f₁、3f₂Each width C of₂4-30 cm, each compact constituent unit 3f₁、3f₂With respect to each sparse constituent unit 3e₁、3e₂、3e₃Ratio C of the sum of (a) to (b)₂/C₁Is 0.02 to 30.

as shown in fig. 17, as an example, the three-dimensional mesh structure 401 of the nursing bed can restrict the lateral movement of the human body by sandwiching the human body from both sides.