JP2008142313A - Mattress body, mattress, and set of mattresses - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mattress body which is a single structure body with excellent air-permeability and body pressure dispersive property, etc., and is effective for preventing decubitus, and to provide a mattress, and a set of mattresses. <P>SOLUTION: The mattress body 10 has a net shape structure where multiple wires 11 composed of polyester elastomer respectively form multiple random loops and are mutually joined at contact points. The mattress body 10 includes: a front layer part 13 with higher surface density in the wire 11; an internal part 15 with a fixed surface density; a rear layer part 17 with the highest surface density; an upper transition part 14 arranged between the surface layer part 13 and the internal part 15; and a lower transition part 16 interposed between the rear layer part 17 and the internal part 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mattress body, a mattress, and a mattress having a net-like structure composed of filaments that have elasticity and form a random loop, and relates to a mattress body, a mattress, and a mattress for bedding suitable for prevention and healing of pressure ulcers. .

  In recent years, the problem of nursing care has been highlighted in the face of an aging society. Under such circumstances, a mattress for bedding that has good breathability, excellent body pressure dispersibility, and the like and is suitable for prevention of pressure ulcers is one of those receiving attention.

  As a mattress for bedding suitable for the prevention of such pressure ulcers, for example, Patent Document 1 includes three layers having an intermediate layer between a surface layer and a back surface layer, and the surface layer and the back surface layer are made of a flexible polyurethane foam. A mattress is proposed in which the intermediate layer is made of hard cotton. Further, a mattress is proposed in which the surface layer is made of a soft polyurethane foam from which the film is removed, and the back layer is made of a soft polyurethane foam having a lower hardness than the surface layer.

Patent Document 2 discloses a mat for a bedding having a thickness of at least 40 mm, in which a cushion part is wrapped with a side fabric made of woven or knitted fabric. compressive stress during compression deformation amount 20mm when given a compressive strain with pressure plate is 10~40gf / cm ^2, the compression stress when the compression deformation amount 40mm is 160~220gf / cm ² bedding Mats have been proposed. Then, a part of the cushion body is formed by twisting a continuous filament having a wire diameter of 5 mm or less made of a thermoplastic elastic resin to form a random loop, and a large portion of the contact portion of each loop is large. There has been proposed a bedding mat formed of a three-dimensional three-dimensional structure network having a thickness of 10 mm or more, which is formed by bonding portions to each other.

  Further, in Patent Document 3, in a mattress for bedding made of a cushion material and a skin material, the cushion material is a three-dimensional three-dimensional structure network made of a linear random loop, and a contact area ratio to a flat plate is 18 to A 75% bedding mattress has been proposed.

  Further, Patent Document 4 discloses a care mat having a size that allows at least a part of the body to be placed thereon, and at least the upper surface layer serving as a placement surface is breathable with respect to the cushion layer having cushioning properties. A care mat is proposed in which a cover formed of a material is covered, and an opening that communicates the outside and the inside of the cover is formed in the cover portion excluding the placement portion of the upper surface layer and the grounding portion of the lower surface layer. Yes. And, as a cushion layer, the thermoplastic synthetic resin thick yarns are joined in a random three-dimensional network to form a three-dimensional structure in which the space in the volume is randomly connected in all directions, in any direction Further, it is disclosed that the thickness of the breathable wall is about 5 mm to about 90 mm, and a rectangular disk-like net-like elastic body can be used in plan view. Further, it is disclosed that the care mat can be connected and laid on a bed for use.

JP 2006-95082 A Japanese Unexamined Patent Publication No. 11-9399 JP 2001-70101 A JP 2005-34392 A

  As a mattress for bedding that is effective in preventing pressure ulcers, it is preferable that the mattress is soft to the body of the person who uses it, and the body weight of the user is stably maintained. A multi-layer mattress having a function different between the floor and the back layer on the bed side that holds the body and the bed is conceivable. Patent Documents 1 and 2 propose such a multilayer mattress. However, in a multi-layer mattress, it is difficult to exert a stable elasticity over a wide range of loads, and there is a problem that a load range in which body pressure dispersibility is deteriorated easily occurs. Such a phenomenon that the body pressure dispersibility is inhibited is the same in the case of the connected nursing mats according to the proposal of Patent Document 4.

  Moreover, in the case of the mattress which uses a urethane material like the mattress for bedding based on the proposal of patent document 1, there exists a problem that air permeability and recyclable disposal cannot be performed. The three-dimensional structure network used for the cushion material part of the mattress according to the proposal of Patent Document 2 or 3 and the cushion layer part of the mat according to the proposal of Patent Document 4 is excellent in breathability, but is too hard and has a body pressure. There is a problem that it tends to be biased to one that is inferior in dispersibility or too soft and has a bottom, and there are few that have moderate elasticity over a wide range of loads.

  In view of such problems and requirements, the present invention provides a mattress body used in a mattress for bedding that is excellent in breathability, body pressure dispersibility, etc., and is suitable for prevention of pressure ulcer, and a mattress using the mattress body. And to provide a mattress.

  A mattress main body according to the present invention is a mattress main body having a net-like structure in which a large number of filaments made of a polyester-based elastomer each form a large number of random loops and are joined to each other at a contact point. A surface layer portion having a high density, a substantially constant inside, a highest back layer portion, an upper transition portion between the surface layer portion and the inside, and a lower transition portion interposed between the back layer portion and the inside. Have.

  In the above invention, the surface density of the line of the back layer is preferably 3 to 10 times the surface density of the line of the surface layer, and the area of the lower transition part is 2 to 4 of the area of the upper transition part. It should be double.

  A mattress for bedding suitable for prevention of pressure ulcer can be constituted from the mattress main body and a waterproof / breathable material or a woven / knitted side fabric covering the mattress main body. In addition, a mat mattress can be configured from this mattress and a duvet covering the top surface of the mattress.

  The mattress body according to the present invention is a single structure, has excellent body pressure dispersibility, has excellent air permeability and durability, and can be recycled. A mattress suitable for bedclothes for preventing pressure ulcers or for nursing care can be constituted from the mattress body and the waterproof / breathable material or the woven / knitted side fabric covering the mattress body. Moreover, the mattress for bedding suitable for the healing of pressure ulcer can be comprised from this mattress and the duvet which covers the upper surface of this mattress.

  Embodiments of a mattress body according to the present invention will be described below with reference to the drawings. The structure of the mattress body 10 according to the present invention is shown in FIG. 1A shows a cross-sectional portion of the mattress body 10, and FIG. 1B schematically shows the surface density of the filaments 11 at each position of the cross-sectional portion shown in FIG. As shown in FIG. 1A, the mattress main body 10 has a network structure in which a large number of filaments 11 made of a polyester elastomer form a large number of random loops and are joined to each other at contact points. . On the surface parallel to the front surface or the back surface at a predetermined height position from the front surface (upper part of FIG. 1A) to the back surface (lower part of FIG. 1A) of the mattress body 10 having such a net-like structure. The ratio of the strip 11 to the area of the surface is the surface density of the strip 11 shown in FIG. In FIG. 1 (a), it is shown that the filament 11 with a higher degree of whiteness is in front (on the paper surface), and the filament 11 with a stronger blackness is in the interior (back side of the paper).

  As shown in FIG. 1 (b), the mattress main body 10 has a surface layer portion 13 with a high surface density of the filaments 11, a substantially constant inner portion 15, a highest back layer portion 17, a surface layer portion 13 and an inner portion 15. It has an upper transition portion 14 between them and a lower transition portion 16 between the back layer portion 17 and the inside 15. As shown in FIG. 2, the surface layer portion 13 and the back layer portion 17 having a high surface density of the filaments 11 include many portions including the entire loop of the filaments 11, and the surface density of the filaments 11 is increased. I understand that. Further, when the portion extending from the surface layer portion 13 to the inside 15 of the mattress body 10 (FIG. 2A) and the portion extending from the back layer portion 17 of the mattress body 10 to the inside 15 (FIG. 2B) are compared, the white line The area of the strip portion is considerably larger in the back layer portion 17 (FIG. 2B) than in the surface layer portion 13 (FIG. 2A). That is, the surface density of the line 11 of the back layer portion 17 is higher than the surface density of the line 11 of the surface layer portion 13.

  In the present mattress body 10, the filament 11 is made of a polyester-based material as described above, but its wire diameter, solid or hollow, etc. are the elastic test, body pressure dispersion test, The most suitable one is selected in consideration of economic efficiency. For example, a hollow filament having an outer diameter of 1 mm and an inner diameter of 0.7 mm can be used. Polyester fibers are preferred because polyester fibers are often used for bedding, are advantageous in production, and are excellent in elasticity and heat retention, and can be recycled.

  Further, in the mattress body 10, the surface density of the line 11 is set so that the surface density of the line 11 of the back layer part 17 is 3 to 10 times the surface density of the line 11 of the surface layer part 13. Good. Thereby, while holding a user's body softly, the person's weight can be stably hold | maintained from a floor or a bed surface now.

  On the other hand, the inside 15 of the mattress main body 10 is a portion that ensures cushioning properties, and appropriate flexibility is required, and a predetermined surface density is selected. A transition portion where the surface density of the filaments 11 gradually changes is provided between the interior 15 and the surface layer portion 13 and the back layer portion 17 having a high surface density. The region portion occupied by the lower transition portion 16 between the back layer portion 17 and the interior 15 may be 2 to 4 times the region portion occupied by the upper transition portion 14 between the surface layer portion 13 and the interior 15. Thereby, it is possible to prevent the occurrence of problems that give a feeling of bottoming like a multi-layer mattress and inhibit body pressure dispersibility.

  The deformed state of the mattress body 10 having such a configuration is compared with the deformed state of a commercially available two-layer mattress (Toshishiya Medical Co., Ltd., trademark Medimat, which uses low-rebound urethane for the upper layer and hard urethane for the lower layer). I will explain. FIG. 3 shows the result of the elasticity test of the mattress body 10, and FIG. 4 shows the result of the elasticity test of the two-layer mattress. In each figure, the horizontal axis indicates the applied load, and the vertical axis indicates bulkiness. Curve 1 shows a load curve in which a load is applied, and curve 2 shows a load-carrying curve in which the applied load is gradually released. The elasticity test was conducted based on JIS L1914.

  As shown in FIG. 3, the load curve and slow load curve of the mattress body 10 are both smooth, but the load curve is almost bulky up to 28000 kg, but in the range of 28000 to 80000 kg. It is almost linear. That is, it can be seen that the elasticity of the mattress body 10 is substantially constant at each load. Similarly, in the load curve, it is bent at the load of 40,000 kg, but the load ranges from 80,000 to 40,000 kg and the range of 4000 to 10,000 kg is almost linear, maintaining the basic elasticity while maintaining a certain elasticity. You can see that it has recovered.

  When the deformation state of the mattress main body 10 is viewed from a structural viewpoint, first, when a load is applied to the mattress main body 10, the inside 15 is gradually compressed and deformed at a substantially constant rate, and the bulkiness of the mattress main body 10 gradually decreases. At this time, the amount of compressive deformation of the lower transition portion 16 is very small. As the load increases further, the upper transition part 14 and the inner part 15 on the upper side of the lower transition part 16 at a certain position (boundary part) are compressed and deformed. Disappear.

  When the applied load is gradually reduced, first, rebound expansion is performed so that the boundary portion is separated from the boundary, and the interior 15 gradually rebounds and expands, and finally is restored to the initial state. That is, in the mattress body 10, the load curve and the slow load curve are almost linear, the deformation state is smooth, and it can be seen that almost constant elasticity is always maintained.

  In addition, the above-mentioned boundary part should be between the height position of 1/2 of the thickness of the mattress body 10 and the bottom surface (back surface), and the size of the area of the upper transition part 14 and the lower transition part 16 is , The boundary is determined to be in such a position. Further, the load curve, slow load curve or deformation state of the mattress body 10 as described above is difficult to achieve with a conventional three-dimensional three-dimensional structure network having a constant surface density within the cross section, and is elastic. In the case where different three-dimensional three-dimensional structure networks are laminated in layers, there is a problem similar to that of a two-layer mattress described below.

  In contrast to the mattress body 10, in the case of a two-layer mattress, as shown in FIG. 4, when the load is increased, the bulk does not substantially change up to the load of 24000kg, but when it exceeds this, it rapidly decreases. From 46000 to 80000 kg, it becomes almost constant, and it can be seen that the two-layer mattress is in a bottomed state. When the applied load is gradually unloaded, the load remains at the bottom from 80000 to 36000kg and hardly recovers. And when the load becomes 36000kg or less, it recovers rapidly and at 16000kg, it recovers to the original state.

  That is, as can be seen from the above description, the mattress main body 10 according to the present invention has different elastic characteristics continuously formed in a single structure, unlike the two-layer mattress, as shown in FIG. It can exhibit elasticity (cushioning) with various characteristics. Such a mattress body 10 can constitute a mattress for bedding having excellent body pressure dispersibility described below.

  5 to 7 show the results of a body pressure dispersion test of the mattress composed of the mattress body 10 and the side cloth of the waterproof and moisture-permeable material. When the user lies on the surface layer 13 side of the mattress body 10 (during normal use), the results of body pressure dispersion are shown in FIG. 5, and when the user lies on the back layer part 13 side of the mattress body 10 (when the back surface is used) The body pressure dispersion result is shown in FIG. 6, and the body pressure dispersion result when sleeping on a wooden floor (directly sleeping) is shown in FIG. 7. In these figures, the horizontal symbols A to O and the numeric symbols 1 to 15 on the vertical axis indicate the positions of the body pressure measurement sensors in the X and Y directions, and the numbers are body pressures (unit: mmHg (1 mmHg = 133 Pa)). Indicates. In each figure, (a) shows the body pressure of the back part of the user, and (b) shows the body pressure of the buttocks part. The body pressure was measured using an FSA body pressure distribution measuring device manufactured by Takano Co., Ltd. The mattress body 10 used in the body pressure dispersion test has a wire 11 with an outer diameter of 1.0 mm and an inner diameter of 0.7 mm, a thickness of 7 cm, a width of 91 cm, and a length of 191 cm. The compression rate described below is 0.1T in the A direction. , B direction 0.2T (T = 10cm).

  5 to 7, the position at which the maximum body pressure is indicated is centered on the front and rear 2 in the Y direction, for example, the maximum body pressure is 40 at the position (K, 8) in FIG. Drawings in which body pressure distribution is graphed in the range of 10 X directions A to O are shown in FIGS. FIG. 8 shows the normal use, FIG. 9 shows the back side use, and FIG. 10 shows the bedtime. In each figure, the horizontal axis represents the position in the X direction, and the vertical axis represents body pressure.

  When FIG. 5 to FIG. 7 are compared, it can be seen that the body pressure dispersibility is good in the case of normal use (FIG. 5). In the case of using the back surface (FIG. 6), it can be seen that the body pressure dispersibility is quite good, but there is also a portion that generates high body pressure. On the other hand, it can be seen that a very high body pressure is locally generated when sleeping directly (FIG. 7). These aspects are clearer when FIGS. 8 to 10 are compared. That is, it can be seen that the shape of the body pressure dispersion curve during normal use is trapezoidal but close to a rectangle, and an equal body pressure is applied to the body. On the other hand, the shape of the body pressure dispersion curve when using the back surface is trapezoidal, and a high maximum body pressure is also seen, indicating that the body pressure dispersibility is somewhat poor. On the other hand, the shape of the body pressure dispersion curve when sleeping directly is triangular, and it can be seen that a very high maximum body pressure is seen and the body pressure dispersibility is not good.

  That is, it is important to make the mattress body 10 have a predetermined elasticity by appropriately adjusting the surface density of the filaments in each part of the mattress body 10. In the mattress body 10 having an appropriate surface density, it is almost uniform. It can be seen that body pressure is applied and the body pressure dispersibility is excellent. It can also be seen that the mattress body 10 having excellent body pressure dispersibility can be achieved because it is a single structure.

  The mattress body 10 according to the present invention has been described above. The mattress body 10 is excellent in body pressure dispersibility as described above, and has a high porosity and excellent moisture permeability and moisture releasing properties because it has a network structure. Therefore, a mattress suitable for preventing pressure ulcers can be configured from such a mattress body 10 and a waterproof / breathable material or a woven / knitted side fabric covering the mattress body 10. The mattress using the waterproof and moisture permeable material as a side fabric has an advantage that there is no problem even if the dirt is wiped off in combination with the advantage of the mattress body 10 that is excellent in moisture permeability and moisture release. A mattress that uses a woven or knitted fabric as a side fabric has an advantage that there is no rubbing sound between the mattress main body 10 and the side fabric, and the body feeling is excellent.

  In addition, it is preferable that a mattress that can be attached to a mattress with a detachable duvet on the mattress using the waterproof / breathable material or the knitted / knitted fabric as a side fabric. And it is good to use the duvet containing tourmaline which can radiate far infrared rays to a duvet, for example. Thereby, the mat mattress which can be used for healing as well as prevention of pressure ulcer can be constituted.

  The basic part of the manufacturing method of the mattress body 10 according to the present invention is the same as the method disclosed in, for example, Patent Document 2, but in the present invention, the melted filaments in which random loops are formed are used. A difference is that a compression step is provided before cooling and solidifying. That is, as shown in FIG. 11, a melted polyester elastomer is discharged from an orifice 32 of a porous nozzle 31 to form and join a melted filament 11 having a large number of random loops. The wire 11 is gripped by the gripping portion 33 (33A, 33B) of the take-up device (not shown), taken in the direction indicated by the arrow C, and solidified in water. However, the wire 11 is gripped in the molten state. The parts 33A and 33B are pushed in the directions of arrows A and B, respectively. At this time, for example, with respect to the thickness T of what was manufactured by the conventional molding method (method in which the surface density difference of the filaments 11 is not provided in the cross section), the pressing (compression) in the A direction is 0.1 T (surface layer portion) 13), and compression in the B direction is 0.2T (the back layer portion 17 is formed) (compression rate is 0.1T in the A direction and 0.2T in the B direction). The structure of the mattress body 10 shown in FIG. 1 can be obtained by adjusting the compression rate.

  A mattress consisting of a mattress body 10 and 100% cotton woven / knitted fabric, and a duvet filled with ceramic-mixed rayon fibers and non-woven fabric containing ceramic in a side fabric made of 55% cotton and 45% polyester. An elasticity test, a heat retention test, and a moisture transfer property test were performed on the mattress assembled in a removable manner. The mattress body 10 has a wire 11 having an outer diameter of 1.0 mm and an inner diameter of 0.7 mm, a thickness of 7 cm, a width of 91 cm, a length of 191 cm, and a compression rate of 0.1 T in the A direction and 0.2 T in the B direction (T = 10 cm). ). The elasticity test was conducted based on JIS L1914, the heat retention test was conducted based on JIS L1911, and the moisture transfer property test was conducted based on JIS L1915. For comparison, the result of a similar test for the two-layer mattress used in the elasticity test of FIG. 4 is shown as a conventional example.

  The results of the elasticity test of the inventive example are shown in FIG. In FIG. 12, the horizontal axis indicates the applied load, and the vertical axis indicates the bulkiness. Curve 1 is a load curve and curve 2 is an unloading curve. According to FIG. 12, it can be seen that the same tendency as in the case of the mattress main body 10 shown in FIG. It can also be seen that the influence of the duvet on the elasticity of the mattress body 10 is not significant.

  Table 1 shows the hygroscopicity, moisture permeability, and moisture release characteristics of the invention examples and comparative examples as a result of the heat retention test and the results of the moisture transfer characteristic test. According to Table 1, it can be seen that in the case of the inventive example, the heat retaining property is 73%, the hygroscopic property is 53%, the moisture permeability is 1.4 times, and the moisture releasing property is 17 times that of the conventional example.

It is explanatory drawing which shows the structure of the mattress main body which concerns on this invention. It is explanatory drawing which shows the part (a) extending from the surface layer part to the inside of the mattress main body of FIG. 1, and the part (b) extending from the back layer part to the inside. It is a graph which shows the elasticity test result of the mattress main body of FIG. It is a graph which shows the elasticity test result of a two-layer mattress. It is drawing which shows the body pressure dispersion | distribution test result (at the time of normal use) of the mattress main body of FIG. It is drawing which shows the body pressure dispersion | distribution test result (at the time of back surface use) of the mattress main body of FIG. It is drawing which shows the body pressure dispersion | distribution test result (at the time of sleeping immediately) of the mattress main body of FIG. 6 is a graph in which a part of the data of the body pressure dispersion test result of FIG. 5 is graphed. FIG. 7 is a graph in which partial data of the body pressure dispersion test result of FIG. 6 is graphed. FIG. 8 is a graph of partial data of the body pressure dispersion test result of FIG. 7. It is a schematic diagram outlining the manufacturing method of the mattress main body of FIG. It is a graph which shows the elasticity test result of a mat mattress.

Explanation of symbols

10 Mattress body
11 wire
13 Surface layer
14 Upper transition part
15 Inside
16 Lower transition
17 Back layer
31 Multi-hole nozzle
32 Orifice
33, 33A, 33B Grip part

Claims (5)

  A large number of filaments made of polyester-based elastomer each form a large number of random loops, and are mattress bodies of a network structure that are joined to each other at contact points. A mattress body having a constant interior, the highest back layer portion, an upper transition portion between the surface layer portion and the interior, and a lower transition portion between the back layer portion and the interior.   The mattress main body according to claim 1, wherein the surface density of the back layer portion is 3 to 10 times the surface density of the surface layer portion.   The mattress body according to claim 1, wherein the area of the lower transition part is 2 to 4 times the area of the upper transition part.   The mattress which consists of the mattress main body which concerns on any one of Claims 1-3, and the side cloth | dough of the waterproof moisture-permeable material or woven / knitted fabric which covers this mattress main body.   A mattress comprising the mattress according to claim 4 and a duvet covering the upper surface of the mattress.

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