JP2006102316A - Mat for bed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mat for a bed which is excellent in body pressure distribution effect, keeps comfortable in-bed temperature and humidity, and has potential for, especially, a bedsore relieving effect. <P>SOLUTION: The mat for the bed is obtained by laminating three-dimensional knitted fabrics A, B which are constituted of the two front and rear layers of knitted fabrics and of connection thread for connecting the two layers of the knitted fabrics and are different in at least 50% compression stress, where the 50% compression stress of the three-dimensional fabric A is not less than 10N and not more than 180N, the 50% compression stress of the three-dimensional fabric B is not less than 20N and not more than 190N, the ratio of the compression stress of both the three-dimensional fabrics is not less than 1.1 and not more than 19.0, and thickness is not less than 20 mm and not more than 200 mm. The compression stress ratio of the three-dimensional fabrics is equal to (the 50% compression stress of the three-dimensional fabric B)/(the 50% compression stress of the three-dimensional fabric A). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mat for a bed that is suitably used as a mat for sleeping, in particular, a nursing mat, and particularly relates to a mat for a bed that can be expected to reduce a floor shift.

As a mat for a bed, a so-called mattress in which a core material made of cotton or polyester, such as cotton or polyester, is covered with a woven or knitted fabric is generally used. Then, there may be a feeling of great pressure, and the sleeping comfort is not always good.
Recently, urethane mats that use urethane foam that does not feel pressure as a core have come to be used, especially for people who suffer from bed slipping. Bed sores are thought to be caused by blood circulation inhibition due to prolonged skin tissue compression and accompanying tissue necrosis, and it is said that a so-called body pressure dispersion effect that compresses a specific site is required. Although urethane mats are excellent in the effect of dispersing body pressure, urethane foam is very easy to absorb moisture, and once absorbed, it cannot be easily dried. Therefore, when it becomes dirty due to incontinence or the like, it cannot be washed and is generally covered with a waterproof fabric. However, moisture generated by sweating or the like is easily accumulated between the waterproof cover and the body, and the resistance of the skin tissue is reduced to cause bed slip.

There is disclosed a bed-like product in which a plurality of honeycomb-shaped three-dimensional knitted fabrics are laminated (see, for example, Patent Document 1). However, in the literature, the compression characteristics of the three-dimensional knitted fabric are not particularly limited, and there is no description about the thickness of the bed sheet. In addition, although the sacral body pressure of the sheet for sleeping is described, the height and weight of the subject who measured the body pressure are not described, so the sacral body pressure value disclosed is also specific It was lacking.
Japanese Patent No. 2846370

  The present invention relates to a mat for a bed that is preferably used as a mat for sleeping, in particular, a mat for nursing care, and has an excellent body pressure dispersion effect, keeps the temperature and humidity in the bed comfortably, and can particularly expect a bed slip reduction effect. An object of the present invention is to provide an excellent mat for a bed.

  In order to solve the above problems, the inventor first paid attention to a body pressure dispersion effect and a bed temperature / humidity reduction effective in reducing bed slip, and the types and compression characteristics of cushion materials constituting the bed mat, and their lamination As a result of intensive investigations on the thickness of the mat and the mat for the bed, the present invention was achieved.

The present invention is a mat for a bed that is preferably used as a mat for a bed, in particular, a mat for nursing care, and is a bed mat that is excellent in body pressure dispersion effect, keeps the temperature and humidity in the bed comfortably, and can particularly expect a bed slip mitigation effect. is there.
The bed sheet of the present invention is a bed sheet that is less likely to cause wrinkles, is excellent in comfort, and can be expected to have an effect of reducing floor displacement.

That is, the present invention is as follows.
(1) A mat for a bed in which a three-dimensional knitted fabric A and a three-dimensional knitted fabric B, which are composed of two layers of front and back knitted fabrics and a connecting yarn that connects the two layers of knitted fabrics, are at least 50% different in compressive stress. The three-dimensional knitted fabric A has a 50% compressive stress of 10 N or more and 180 N or less, the three-dimensional knitted fabric B has a 50% compressive stress of 20 N or more and 190 N or less, and the compression stress ratio of the three-dimensional knitted fabric is 1.1 or more and 19.0 or less. There is a mat for a bed which has a thickness of 20 mm or more and 200 mm or less.
However, the compression stress ratio of the three-dimensional knitted fabric = (50% compression stress of the three-dimensional knitted fabric B) / (50% compressive stress of the three-dimensional knitted fabric A)
(2) The mat for bed according to (1) above, wherein the three-dimensional knitted fabric A and the three-dimensional knitted fabric B are laminated in two layers or more and 15 layers or less, alternately or randomly.
(3) The mat for a bed according to (1) or (2) above, wherein the connecting yarns of the three-dimensional knitted fabrics A and B are made of monofilament yarns.
(3) The mat for a bed according to (3) above, wherein the monofilament yarn of the connecting yarn of the three-dimensional knitted fabrics A and B is polytrimethylene terephthalate fiber.
(4) The bed mat according to any one of (1) to (4), wherein the mat is a care mat.

Hereinafter, the present invention will be described in detail.
The mat for the bed of the present invention refers to a mat used as a bedding, and includes a mattress, a mattress for a bed, and an overlay type pad used on these mats. Further, if the effect of the present invention can be achieved, it may be used in combination with a commercially available mattress, mattress or overlay type pad, or may be used by covering with a sheet or the like.

  It is important that the mat for the bed of the present invention is composed of at least two types of knitted fabric having two or more front and back layers having specific compression characteristics and a three-dimensional knitted fabric composed of connecting yarns connecting the two layers of knitted fabric. If the effect of the present invention can be achieved, a three-dimensional knitted fabric, a woven / knitted fabric, a urethane foam, a sheet-like product made of fiber cotton, etc. having other compression characteristics may be laminated, and the order of the lamination is also particularly limited. Is not to be done. As a method for laminating the three-dimensional knitted fabric A and the three-dimensional knitted fabric B of the present invention, for example, any method such as AABB, ABBAB, ABBBA, etc. may be used. The total thickness of the knitted fabric A is preferably larger than the total thickness of the three-dimensional knitted fabric B. In the opposite case, the body pressure dispersibility may be inferior.

Moreover, as long as the effect of the present invention can be achieved, a laminate obtained by laminating at least two kinds of three-dimensional knitted fabrics of the present invention may be covered with a cover material made of a woven / knitted fabric or the like. The number of three-dimensional knitted fabrics A and B is preferably 2 to 15 respectively. The bed mat of the present invention has an important thickness of 20 mm or more and 200 mm or less, preferably 30 mm or more and 150 mm or less, more preferably 40 mm or more and 100 mm or less.
The thickness is 20 mm or more from the viewpoint of body pressure dispersion pressure, and is 200 mm or less from the viewpoint of stability when bedridden and ease of turning over.
It is preferable that the total thickness of the two kinds of three-dimensional knitted fabrics of the present invention occupy 50% or more, more preferably 60% or more, particularly preferably 80% or more, most preferably relative to the thickness of the mat for a bed. Is 90% or more. It is 50% or more from the viewpoint of body pressure dispersibility and humidity reduction effect.

The body pressure dispersion pressure of the bed mat of the present invention is preferably 6.666 kPa or less, preferably 1.111 kpa or more and 5.333 kPa or less, more preferably 2.222 kPa or more and 4.266 kPa or less. The above range is preferable from the viewpoints of a sense of pressure, blood flow inhibition due to compression of capillaries and the like, and bed slipping.
Moreover, it is preferable that the amount of compressive displacement of the mat for a bed under the pressure of 4.266 kPa is 10 mm or more and 150 mm or less, More preferably, it is 15 mm or more and 100 mm or less, More preferably, it is 20 mm or more and 50 mm or less. If it is 10 mm or more, there is a body pressure dispersion effect, and if it is 150 mm or less, a humidity reduction effect is obtained, and it is very easy to turn over.

Furthermore, the compression recovery rate at 4.266 kPa of the bed mat is preferably 70% or more, more preferably 80% or more, and more preferably 90% or more. If it is 70% or more, the body pressure dispersion pressure when used for a long time is suitable, and bed slippage hardly occurs.
The mat for bed according to the present invention is composed of a three-dimensional knitted fabric A having a 50% compressive stress of 10 N or more and 180 N or less, and a three-dimensional knitted fabric B having a 50% compressive stress of 20 N or more and 190 N or less. It must be 1 or more and 19.0 or less. Within this range, body pressure dispersibility is excellent.

Here, the compression stress ratio of the two types of three-dimensional knitted fabrics is calculated by the following formula.
Compressive stress ratio of three-dimensional knitted fabric = (50% compressive stress of three-dimensional knitted fabric A) / (50% compressive stress of three-dimensional knitted fabric B)
The preferred ranges of the various characteristic values are as follows.
The 50% compressive stress of the three-dimensional knitted fabric A is preferably 10N or more and 120N or less, more preferably 15N or more and 100N or less, and further preferably 20N or more and 50N or less.
The 50% compressive stress of the three-dimensional knitted fabric B is preferably 20N or more and 150N or less, more preferably 30N or more and 120N or less, still more preferably 50N or more and 100N or less.
The compression stress ratio between the three-dimensional knitted fabric A and the three-dimensional knitted fabric B is preferably 1.2 or more and 5.0 or less, more preferably 1.3 or more and 3.0 or less. Therefore, the three-dimensional knitted fabric A is 50% smaller in compressive stress than the three-dimensional knitted fabric B.
Obtaining such a three-dimensional knitted fabric having a different 50% compressive stress can be achieved by adjusting the thickness of the connecting yarn, the gauge of the knitting machine, the thickness, the fabric density, and the tensile rate of the process in the finishing set.

  It is important that the three-dimensional knitted fabric of the present invention is composed of two layers of front and back knitted fabrics and connecting yarns connecting the two layers of knitted fabrics. When a three-dimensional knitted fabric is knitted using a double raschel knitting machine, a double circular knitting machine, a flat knitting machine or the like, the connecting yarns that connect the front and back knitted fabrics are always knitted in a curved state in either direction. When a force is applied to the connecting yarn from the thickness direction, the connecting yarn is further bent from the already bent state, and when the force is removed, the original state is restored. Since the bending and recovery behavior of the connecting yarn generated at this time greatly affects the cushioning property of the three-dimensional knitted fabric, the monofilament having high bending rigidity is preferably used for the connecting yarn. Therefore, all the connecting yarns of the three-dimensional knitted fabric are preferably monofilaments, but if necessary, fibers other than the monofilaments may be knitted during knitting. The fibers other than the monofilament in that case preferably have a weight mixing ratio in the connecting yarn of 50% or less, more preferably 40% or less. For example, it is preferable to knit multi-filament false-twisted yarn because it can reduce annoying noise generated by rubbing monofilaments during compression.

The monofilament used for the connecting yarn of the three-dimensional knitted fabric of the present invention is a fiber of any material such as polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyethylene terephthalate fiber, polyamide fiber, polypropylene fiber, polyvinyl chloride fiber, polyester elastomer fiber, etc. However, it is preferable to use polytrimethylene terephthalate fiber for the connecting yarn because the recoverability after repeated or long-time compression becomes good.
The fibers used for the two-layer knitted fabric of the three-dimensional knitted fabric are not particularly limited, and are polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, polybutylene terephthalate fibers, polyester-based elastomer fibers, polyamide-based fibers, and polyacryl-based fibers. Synthetic fibers such as polypropylene fibers, natural fibers such as cotton, hemp, and wool, recycled fibers such as cupra rayon, viscose rayon, and lyocell, and other arbitrary fibers can be used.
The cross-sectional shape of the fiber may be round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, Yaba-shaped, flat-shaped, dog-bone-shaped, etc., multi-leafed, hollow, or irregular Good. The form of the fiber may be any of unprocessed yarn, spun yarn, twisted yarn, false twisted yarn, fluid injection processed yarn and the like.

  In the three-dimensional knitted fabric of the present invention, the polytrimethylene terephthalate fiber preferably used refers to a polyester fiber having a trimethylene terephthalate unit as a main repeating unit, and the trimethylene terephthalate unit is about 50 mol% or more, preferably 70 mol% or more. Furthermore, it means 80 mol% or more, more preferably 90 mol% or more. Therefore, the total amount of the other acid component and / or glycol component as the third component is about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, more preferably 10 mol% or less. Polytrimethylene terephthalate prepared.

  As a preferable characteristic of the polytrimethylene terephthalate fiber, the strength is 2 to 5 cN / dtex, preferably 2.5 to 4.5 cN / dtex, and more preferably 3 to 4.5 cN / dtex. The elongation is 30 to 60%, preferably 35 to 55%, more preferably 40 to 55%. The elastic modulus is 30 cN / dtex or less, preferably 10 to 30 cN / dtex, more preferably 12 to 28 cN / dtex, and particularly preferably 15 to 25 cN / dtex. The elastic recovery at 10% elongation is 70% or more, preferably 80% or more, more preferably 90% or more, and most preferably 95% or more.

Polytrimethylene terephthalate is synthesized by combining terephthalic acid or a functional derivative thereof with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under appropriate reaction conditions. In this synthesis process, an appropriate one or two or more third components may be added to form a copolymer polyester, or a polyester other than polytrimethylene terephthalate such as polyethylene terephthalate or polybutylene terephthalate, nylon and polytrimethylene. After methylene terephthalate is synthesized separately, it may be blended or composite-spun (sheath core, side-by-side, etc.). Regarding composite spinning, Japanese Patent Publication Nos. 43-19108, 11-189923, 2000 No. 239927, JP-A 2000-256918, etc., the first component is polytrimethylene terephthalate, the second component is a polyester such as polytrimethylene terephthalate, polyethylene terephthalate, polybutylene terephthalate, Na There is a composite spinning of side-by-side type or eccentric sea core type in which irons are arranged in parallel or eccentric, especially the combination of polytrimethylene terephthalate and copolymerized polytrimethylene terephthalate, and two types with different intrinsic viscosities. A combination of polytrimethylene terephthalate is preferable. In particular, two types of polytrimethylene terephthalate having different intrinsic viscosities as exemplified in JP-A No. 2000-239927 are used, and the bonding surface is such that the low viscosity side wraps around the high viscosity side. A compound spun in a side-by-side shape having a curved shape has both high stretchability and bulkiness, and is particularly preferable.

  The third component to be added includes aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.), fat Aliphatic glycols (ethylene glycol, 1,2-propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanedimethanol, etc.), aliphatic glycols containing aromatics (1,4-bis (β-hydroxyethoxy) benzene Etc.), polyether glycol (polyethylene glycol, polypropylene glycol etc.), aliphatic oxycarboxylic acid (ω-oxycaproic acid etc.), aromatic oxycarboxylic acid (P-oxybenzoic acid etc.) and the like. A compound having one or three or more ester-forming functional groups (such as benzoic acid or glycerin) can also be used within the range where the polymer is substantially linear.

In addition, matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, easy lubricants such as aerosil, antioxidants such as hindered phenol derivatives, difficulty A flame retardant, antistatic agent, pigment, fluorescent whitening agent, infrared absorber, antifoaming agent, and the like may be contained.
In the present invention, for spinning polytrimethylene terephthalate fiber, for example, there is International Publication No. 99/27168 pamphlet, etc., and after obtaining an undrawn yarn at a winding speed of about 1500 m / min, about 2 to 3.5 times. Any of a method of stretching by spinning, a straight stretching method (spin draw method) in which the spinning-stretching process is directly connected, and a high speed spinning method (spin take-up method) with a winding speed of 5000 m / min or more may be employed.

Moreover, the monofilament of a polytrimethylene terephthalate fiber can be manufactured by the method described in the international publication WO01 / 75200 pamphlet, for example. That is, polytrimethylene terephthalate is discharged from the nozzle, rapidly cooled in a cooling bath, wound up with a first roll, then wound up with a second roll while being stretched in warm water or a dry heat atmosphere, and then dried. In a hot atmosphere or a moist heat atmosphere, it can be manufactured by a method of relaxing by overfeeding and winding with a third roll.
The form of the fiber may be long fiber or short fiber, and may be uniform or thick in the length direction. In the cross section, a round shape is preferable for improving the compression durability of the three-dimensional knitted fabric.

  The fineness of the monofilament used for the connecting yarn is not limited and may be arbitrarily set so as to obtain a desired compressive stress, and is usually 20 to 1500 dtex. The thickness of the monofilament is preferably 50 to 1000 dtex, more preferably 100 to 800 dtex from the viewpoint of giving the three-dimensional knitted fabric a more excellent cushioning property. As the fibers such as multifilaments used for the front and back knitted fabrics, those having a thickness of 50 to 2000 dtex can be usually used, and the single yarn fineness of the fibers other than the predetermined front and back knitted fabrics can be arbitrarily set.

The three-dimensional knitted fabric of the present invention can be knitted with a double raschel knitting machine having two rows of needle beds, a double circular knitting machine, a flat knitting machine with a V bed, etc., but in order to obtain a three-dimensional knitted fabric with good dimensional stability. It is preferable to use a double Russell knitting machine. The gauge of the knitting machine is preferably 9 gauge to 28 gauge.
The knitted fabric on the front and back sides of the three-dimensional knitted fabric may be a knitted fabric having a plurality of openings such as a square knitted fabric, a square knitted fabric, a marquette knitted fabric, etc. The touch may be improved. By raising the surface, a material having a good touch can be obtained.
The connecting yarns may be looped stitches formed on the front and back knitted fabrics, or may have a structure in which they are hooked on the front and back knitted fabrics, but at least two connecting yarns reverse the knitted fabrics on the front and back sides. In order to improve the form stability of the three-dimensional knitted fabric, it is preferable to incline in the direction and connect it in a cross shape (X shape) or a truss shape.

  The knitted fabrics on the front and back sides of the three-dimensional knitted fabric of the present invention are preferable so that the monofilament yarn used for the connecting yarn is not exposed, because it can suppress the feeling of roughness and glare due to gloss. As a method of suppressing the exposure of the monofilament yarn, the fineness of the multifilament yarn is made larger than the fineness of the monofilament yarn, the feeding tension of the monofilament yarn is made larger than the feeding tension of the multifilament, and the feeding of the multifilament yarn When the yarn is fed on the overfeed side from the normal feed rate, the number of filaments of the multi yarn is increased, or when knitting with a double raschel knitting machine, the overlap direction of the monofilament yarn and the needle of the multi yarn is fed at least in the same direction. It is preferable to knit by a method such as the above.

Further, the relationship between the total fineness D (decitex) of the multi yarn and the fineness d (decitex) of the connecting yarn in the same stitch of the surface knitted fabric is preferably 1.1 or more, more preferably D / d. Is 1.5-15.0.
In the case of D / d <1.1, the uniform coverage of the monofilament yarn by the multi-yarn is lowered, the surface of the knitted fabric cannot be suppressed and the glare due to the gloss cannot be suppressed, and the surface has a smooth texture. There are cases where it cannot be obtained.
Furthermore, it is only necessary to increase the coverage of the fibers constituting the front and back surfaces, and it is preferable to use bulky yarns such as false twisted yarns and spun yarns as multifilament yarns constituting the front surface, and in particular, false twisted yarns of cellulosic fibers. And false twisted yarns of polyester-type synthetic fibers having a different cross section such as W-type.

Regarding the density of the connecting yarn, the number of connecting yarns in an area of 2.54 cm square (6.45 cm ² ) of a three-dimensional knitted fabric is N (lines / 6.45 cm ² ), and the dtex of the connecting yarn is T (g / 1 × 10 6 cm) and the specific gravity of the connecting yarn is ρ 0 (g / cm ³ ), the total cross-sectional area (N · T / 1 × 10 ⁶ · ρ 0) of the connecting yarn in the area of the solid knitted fabric 6.45 cm ² is 0.01 to 0.3 cm ² is preferable. By setting within this range, a three-dimensional knitted fabric having a specific 50% compressive stress of the present invention can be obtained.
The connecting yarns may be looped stitches formed on the front and back knitted fabrics, or may have a structure in which they are hooked on the front and back knitted fabrics, but at least two connecting yarns reverse the knitted fabrics on the front and back sides. In order to improve the form stability of the three-dimensional knitted fabric, it is preferable to incline in the direction and connect it in a cross shape (X shape) or a truss shape.

  In the three-dimensional knitted fabric, insertion yarns (monofilament yarns and / or multifilament yarns) may be linearly inserted in the warp direction and / or the transverse direction of at least one of the front and back knitted fabrics. The knitted fabrics on the front and back sides of the three-dimensional knitted fabric do not need to have the same knitted structure, and may be different knitted structures, and a knitted fabric having a plurality of openings such as a mesh knitted fabric of four or six corners, a marquette knitted fabric, etc. Lightness and breathability may be improved, and a flat structure may be used to improve the touch. However, by making the knitted fabric with mesh-like openings on both the front and back surfaces, breathability is improved and steaming is achieved. What improved is preferable.

The thickness of the three-dimensional knitted fabric can be arbitrarily set, but the thickness is 2 mm or more from the viewpoint of comfortably maintaining the temperature and humidity in the bed, 20 mm or less is preferable from the viewpoint of recoverability after compression, 2-18 mm is particularly preferable, and 5 ˜15 mm is preferred.
The solid knitted fabric of the present invention preferably has a recovery rate after compression of 80% or more, more preferably 90% or more.
The three-dimensional knitted fabric of the present invention preferably has an elongation at a load of 4.9 N / cm in the warp and weft directions of 3 or more and 60% or less, more preferably 5 or more and 30% or less, and most preferably 5 Above, it is 20% or less.
The elongation is 3% or more because the body pressure dispersion pressure is lowered, and 60% or less from the viewpoint of the form stability of the mat.

  The fibers used for the front and back knitted fabrics or connecting yarns of the three-dimensional knitted fabric of the present invention may be uncolored or colored. Coloring methods include dying uncolored yarn in the form of skein or cheese (dyeing), coloring by mixing pigments, dyes, etc. in the stock solution before spinning (dye solution coloring), dyeing in three-dimensional knitting Although it can be colored by a printing method or the like, dyeing in a three-dimensional knitted form is difficult to maintain a three-dimensional shape or has poor processability.

As a finishing method of three-dimensional knitted fabric, the raw machine can be finished through processes such as scouring, dyeing, heat setting, etc., but if design properties are not required as a three-dimensional knitted fabric or use using pre-dyed yarn or stock solution colored yarn, It is also possible to finish the raw machine immediately by heat setting without the scouring and dyeing process.
Also, finishing processing such as resin processing, water absorption processing, antistatic processing, antibacterial processing, water repellent processing, and flame retardant processing, which are usually used for fiber processing, can be applied as long as the purpose of the present invention is not impaired during finishing set. .

When making a mat for a bed with a three-dimensional knitted fabric having different compression characteristics according to the present invention, the connecting yarn may loosen from the end when it is cut. Therefore, it is preferable to treat the end portion by means such as fusion, sewing, resin processing, and piping. In particular, piping is preferable because a plurality of pieces can be sewn and can be sewed, and an end processing step can be omitted. The piping material may be arbitrarily selected in consideration of the thickness of the sewing portion, the jumping of the connecting thread, and the durability during use. The piping part is preferably sewn with a double stitch so as not to be damaged by washing or the like.
Further, when laminating the three-dimensional knitted fabric subjected to the end treatment in this way, it is preferable to fix the entire surface or a part thereof so that they are not displaced. The method of fixing is not particularly limited, and may be fixed by sewing, quilting, resin bonding, hooks or the like.

The present invention will be specifically described below.
(1) Measurement of intrinsic viscosity [η] Intrinsic viscosity [η] (dl / g) is a value determined based on the definition of the following equation.
[Η] = lim (ηr−1) / C
C → 0
Ηr in the definition is a value obtained by dividing the viscosity at 35 ° C. of a diluted polymer solution dissolved in an o-chlorophenol solvent with a purity of 98% or more by the viscosity of the solvent measured at the same temperature, and is defined as a relative viscosity. It is what has been. C is the polymer concentration expressed in g / 100 ml.

(2) Strength and elongation characteristics of yarn Using Tensilon manufactured by Toyo Baldwin Co., Ltd., tensile strength (cN / dtex), elongation (%), initial elastic modulus (cN) under the conditions of a sample length of 20 cm and a tensile speed of 20 cm / min. / Dtex).
(3) Elastic recovery rate of yarn The fiber was attached to a tensile tester with an initial load of 0.0294 cN / dtex at a distance between chucks of 20 cm, stretched to a stretch rate of 10% at a pulling speed of 20 cm / min, and left for 1 minute. did. Then, it shrinks again at the same speed, and draws a stress-strain curve. The elongation when the stress becomes zero during shrinkage is defined as the residual elongation (A). The elastic recovery rate was determined according to the following formula.
Elastic recovery rate at 10% elongation (%) = {(10−A) / 10} × 100

(4) Thickness of knitted fabric and bed mat Measured according to the thickness measurement method of JIS-L-1018.
(5) Compressive stress at 50% compression (N)
Using a Shimadzu Autograph AG-B type (manufactured by Shimadzu Corporation), a 15-cm square, three-dimensional knitted fabric with a thickness T0 (mm) placed on a smooth rigid body surface with a disc-shaped compression jig with a diameter of 100 mm was 10 mm / Compression was performed at a rate of min until the thickness became 50% (1/2 T0 mm), and the maximum stress was determined.

(6) Compression recovery rate
The compression recovery rate was determined by measuring the thickness (Bmm) after 10 minutes by applying a load to leave the thickness (Amm) of the three-dimensional knitted knitted fabric to be half (A / 2mm), leaving it for 5 minutes. Calculated by
Compression recovery rate (%) = B / A × 100
(7) Elongation of knitted fabric The weft and warp directions were measured by the grab method according to the constant load elongation of JIS-L-1018. The load per 2.5 cm width of the sample was 12.25N.

(8) Body pressure dispersion pressure of the mat for the bed The paracare mattress made by Paramount Bed Co., Ltd. is attached to the bed for care, and the mat for the bed created in the examples and comparative examples is placed thereon, and the upper part thereof The body pressure dispersion measuring device X sensor (model X2: manufactured by XSENSER Technology) is arranged in the body. On top of this, a man with a length of 170 cm and a 65 kg man rests in the supine position, and the body pressure dispersion of the buttocks is measured 10 times at a rate of once per second and averaged, and the value indicating the highest pressure value in the buttocks is calculated. The pressure dispersion pressure was used.
(9) Compressive displacement of mat for bed The thickness T0 (mm) placed on a smooth rigid body surface using a Shimadzu autograph AG-B type (manufactured by Shimadzu Corporation) with a disk-shaped compression jig having a diameter of 100 mm The mat for sleeping was compressed at a speed of 10 mm / min until a pressure of 4.266 kPa was reached, and the displacement (mm) was measured.

(10) Compression recovery rate of the mat for the bed The compression recovery rate was applied to the mat for the bed (thickness (Amm)) with a pressure of 4.226 kPa (pressure surface is 100 mm in diameter) and left for 5 minutes. The thickness (Bmm) 10 minutes after dewetting is measured and calculated by the following formula.
Compression recovery rate of mat for bed (%) = B / A × 100

(11) Evaluation of comfort and ease of turning over of a mat for a bed A paracare bed manufactured by Paramount Bed Co., Ltd. is attached to a bed for care and a bed created in Examples and Comparative Examples on the bed. A bed for the nursing care using a paracare mattress made by Paramount Bed Co., Ltd. as a cushioning material and a bed sheet of Examples and Comparative Examples was laid, and a man wearing 100% cotton pajamas was supine. The sensory evaluation of the comfort in the state was performed, and then the rollover was repeated several times to evaluate the ease of rollover. Ten men were evaluated in the same manner, and the average score was evaluated. The elongation of 10 men was 170 to 175 cm, and the weight was 65 to 70 kg.
"Sleep comfort"
3 points: There is almost no feeling of pressure, there is moderate depression of the body, and it is comfortable.
2 points: A little feeling of pressure or a body sinking amount is slightly large and slightly uncomfortable.
1 point: A strong feeling of pressure is partly felt, or the amount of sinking of the body is very large and uncomfortable.
"Ease of turning over"
3 points: Can be easily turned over.
2 points: Slightly difficult to roll over.
1 point: It is very difficult to turn over.

(12) Steaming evaluation of a mat for a bed The sample was prepared in the examples and comparative examples on the nursing bed and mattress used in the evaluation of (11) under the environment of room temperature 28 ± 1 ° C. and humidity 65 ± 5% RH. A man wearing a mat for sleeping and wearing a 100% cotton pajamas was rested in the awake state for 60 minutes in the supine position, and the stuffiness was quantified as follows. Ten men were evaluated in the same manner, and the average score was evaluated. The elongation of 10 men was 170 to 175 cm, and the weight was 65 to 70 kg.
During the test, a cotton pile towel made by Ryokan Keikaku Co., Ltd. was applied from the neck to the toes.
3 points: No stuffiness.
2 points: Slightly stuffy.
1 point: I feel very stuffy.

<Manufacture of monofilament of polytrimethylene terephthalate fiber>
(Production Examples 1-4)
A first roll group having a speed of 16.0 m / min while discharging polytrimethylene terephthalate having an intrinsic viscosity [η] = 0.9 from a spinning nozzle at a spinning temperature of 265 ° C., and guiding and cooling in a cooling bath at 40 ° C. To produce an unstretched monofilament. Next, the film was pulled by a second roll group of 80.0 m / min while being stretched 5 times in a stretching bath at a temperature of 55 ° C. Then, while performing relaxation heat treatment in a 120 ° C. steam bath, after passing through a third roll group of 72.0 m / min, winding with a winder of the same speed as the third roll group, 56 dtex, 110 dtex, 180 dtex, A 300 dtex drawn monofilament was produced. The properties of the drawn yarn obtained are shown in Table 1.

<Manufacture of three-dimensional knitted fabric>
(Production Example 5)
Using an 18-gauge double raschel machine equipped with 6 ridges and a 13 mm gap between the hooks, two ridges (L1, L2) that form the knitted fabric on the front side and two ridges (L5, L2) that form the knitted fabric on the back side L6) is a 330 dtex / 96 filament polyethylene terephthalate fiber false twisted yarn (manufactured by Asahi Kasei Fibers Co., Ltd., polyester), and two ridges (L3, L4) forming the connecting yarn are 56 dtex polytrins of Production Example 1. Methylene terephthalate monofilament yarn is supplied in 1-in-1 out arrangement in L1, L3, and L5 guides and in 1-out 1-in arrangement in L2, L4, and L6 guides, and driven in at 17.5 course / 2.54 cm. A three-dimensional knitted fabric with front and back meshes was knitted with the knitting structure shown in FIG.
The obtained green machine was heat-dried with heat and finished so that the knitted fabric density on the surface of the three-dimensional knitted fabric was 18.0 course / 2.54 cm and 8.0 wal / 2.54 cm. The obtained knitted fabric properties are shown in Table 2.

(Knitting organization)
L1: 1011/1211/1011/1211/1011/1222/2322/2122/2322/2122/2322/21111 /
L2: 2322/2122/2322/2122/2322/2111/1011/1211/1011/1211/1011/1222 /
L3: 2121/2323/2121/4545/2121/2323/3434/3323/243434/1010/3434/3232 /
L4: 3434/3232/3434/1010/3434/3232/2121/2323/2121/4545/2121/2323 /
L5: 1110/1112/1110/1112/1110/1112/2223/2221/2223/2221/2223/2221 /
L6: 2223/2221/2223/2221/2223/2221/1110/1112/1110/1112/1110/1112 /

(Production Examples 6-8)
Three-dimensional knitted fabrics of Production Examples 6 to 8 were obtained in the same manner as in Production Example 5 except that the space between the hooks and the connecting yarn were changed as shown in Table 1. The obtained knitted fabric properties are shown in Table 2.

(Production Example 9)
A three-dimensional knitted fabric was obtained in the same manner as in Production Example 8 except that the knitted fabric density on the surface of the three-dimensional knitted fabric was 18.0 course / 2.54 cm and 7.5 wal / 2.54 cm. It was. The obtained knitted fabric properties are shown in Table 2.

(Production Example 10)
A three-dimensional knitted fabric was obtained in the same manner as in Production Example 5 except that it was changed to 180 dtex nylon 66 fiber monofilament yarn (manufactured by Asahi Kasei Fibers). The obtained knitted fabric properties are shown in Table 2.

(Production Example 11)
Using a 22 gauge, 4.2 mm double raschel knitting machine equipped with 6 rivets, a 167 dtex / 48f W-shaped polyethylene terephthalate system on 2 creases (L1, L2) forming the surface knitted fabric Two folds (L5, L6) that form a knitted fabric on the back side by supplying all false-twisted yarn (made by Asahi Kasei Fiber Co., Ltd., trademark “Technofine” false-twisted yarn) in an all-in arrangement. In addition, the same false twisted yarn is supplied in a 3 in 1 out arrangement, and 56 dtex nylon 66 fiber monofilament yarn (manufactured by Asahi Kasei Fibers Co., Ltd.) is supplied in an all-in arrangement at the L3 heel forming the connecting yarn. Then, a raw machine of a three-dimensional knitted fabric with a surface knitted fabric density of 33.3 course / 2.54 cm and 24.8 wale / 2.54 cm was knitted with the following structure.
L1: 2422/2022 /
L2: 2022/4644 /
L3: 0220/2002 /
L5: 4420/2224/2220/2242/4468/6664/6668/6646 /
L6: 4468/6664/6668/6646/4420/2224/2220/2242 /
The obtained raw machine was scoured according to a conventional method, and then heat-set by dry heat to obtain a three-dimensional knitted fabric having a flat knitted fabric on the front surface and a mesh knitted fabric on the back surface.
The surface knitted fabric density of the obtained three-dimensional knitted fabric was 35.0 course / 2.54 cm, 22.2 wal / 2.54 cm, and other knitted fabric properties are shown in Table 2.
The present invention will be described based on examples.

[Example 1]
Three pieces of Production Example 6 and two pieces of Production Example 7 were cut into a bed size one by one, and then the ends were piped and sewn. Subsequently, two solid knitted fabrics B and two solid knitted fabrics A were laminated in this order from the lower layer to obtain a bed mat. In addition, hooks were attached to the corners and integrated so that the stacked ones were not displaced.
Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an excellent effect of reducing bed slip.

[Example 2]
Table 3 shows the results of the characteristic evaluation with the bed mat obtained in Example 1 turned upside down. This mat for bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an excellent effect of reducing bed slip.

[Example 3]
A sleeping mat was prepared in the same manner as in Example 1 so that Production Example 6 was 3 sheets and Production Example 10 was 2 sheets from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This bed mat is comfortable to sleep, easy to roll over, hardly feels stuffy, has excellent body pressure dispersibility, and has an effect of reducing bed slippage. There was a tendency to feel the bottom.

[Example 4]
A mat for a bed was prepared in the same manner as in Example 1 so that one production example 6 and one production example 7 were formed from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an effect of reducing bed slip.

[Example 5]
A bed mat was prepared in the same manner as in Example 1 so that Production Example 6 was 6 sheets and Production Example 7 was 7 sheets from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an effect of reducing bed slip.

[Example 6]
A mat for bed was prepared in the same manner as in Example 1 so that there were 3 production examples 7 and 2 production examples 9 from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an effect of reducing bed slip.

[Example 7]
A mat for bed was prepared in the same manner as in Example 1 so that there were 2 production examples 6 and 3 production examples 9 from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an effect of reducing bed slip.

[Example 8]
In the same manner as in Example 1, piping sewing was performed for each sheet so that Production Example 6 would be 3 sheets and Production Example 7 would be 2 sheets from the lower layer. It was covered with a box-type cover created as described above to create a mat for a bed. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed has good sleeping comfort, is easy to turn over, has almost no stuffiness, has excellent body pressure dispersibility, and has an effect of reducing bed slip. Moreover, since the three-dimensional knitted fabric of Production Example 11 was excellent in surface smoothness, the touch was also good.

[Comparative Example 1]
A mat for bed was prepared in the same manner as in Example 1 so that two production examples 5 and one production example 8 were formed from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed had poor sleeping comfort, was difficult to turn over, felt stuffy, had poor body pressure dispersibility, and had no bed slip mitigation effect.

[Comparative Example 2]
A sleeping mat was prepared in the same manner as in Example 1 so that one production example 11 and one production example 7 were formed from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. Since the mat for the bed has no thickness, the sleeping comfort is poor, the feeling of stuffiness is felt, the body pressure dispersibility is inferior, and there is no effect of reducing the bed slip.

[Comparative Example 3]
A mat for sleeping was prepared in the same manner as in Example 1 so that Production Example 6 was 15 sheets and Production Example 9 was 4 sheets from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This bed mat is thick, difficult to turn over, and has a large amount of sinking in the body.

[Comparative Example 4]
A mat for a bed was prepared in the same manner as in Example 1 so that Production Example 6 was 3 sheets from the lower layer. Table 3 shows the evaluation results of the characteristics of the obtained mat for the bed. This mat for the bed had poor sleeping comfort, was difficult to turn over, felt stuffy, had poor body pressure dispersibility, and had no bed slip mitigation effect.

  The present invention is a bed mat that is excellent in body pressure dispersion effect, comfortably keeps the temperature and humidity in the bed, and can be expected to reduce the bed slip, and is preferably used as a nursing mat. It can be suitably used as a bed for a normal bed or mattress in a facility or home.

Claims (5)

A mat for a bed in which a three-dimensional knitted fabric A and a three-dimensional knitted fabric B, which are composed of two layers of knitted fabrics and connecting yarns that connect the two knitted fabrics, have different compressive stresses, and are laminated. 50% compressive stress of 10N or more and 180N or less, three-dimensional knitted fabric B 50% compressive stress of 20N or more and 190N or less, the compression stress ratio of both three-dimensional knitted fabric is 1.1 or more and 19.0 or less, and A mat for a bed having a thickness of 20 mm or more and 200 mm or less.
However, the compression stress ratio of the three-dimensional knitted fabric = (50% compression stress of the three-dimensional knitted fabric B) / (50% compressive stress of the three-dimensional knitted fabric A)   The bed mat according to claim 1, wherein the three-dimensional knitted fabric A and the three-dimensional knitted fabric B are laminated in two or more layers, 15 layers or less, and alternately or randomly.   The mat for bed according to claim 1 or 2, wherein the connecting yarn of the three-dimensional knitted fabric A and the three-dimensional knitted fabric B is composed of a monofilament yarn.   The bed mat according to claim 3, wherein the monofilament yarn of the connecting yarn of the three-dimensional knitted fabric A and the three-dimensional knitted fabric B is a polytrimethylene terephthalate fiber.   The bed mat according to any one of claims 1 to 4, wherein the mat is a nursing mat.