JP2016220921A - Fiber sheet excellent in irregularity fitting property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber sheet comprising preferable irregularity fitting property which can be wound along a shape of a surface irregularity even when the fiber sheet is wound with proper intensity, and a bandage using the same.SOLUTION: There are provided: a fiber sheet comprising a longitudinal direction and a width direction, and bending resistance in the width direction measured according to a handle-O-meter method of JIS L 1913 of equal to or lower than 300 mN/200 mm; and a bandage using the same. The fiber sheet may be, for example, a non-woven fabric sheet comprising a waviness fiber.SELECTED DRAWING: None

Description

  The present invention relates to a fiber sheet that can be suitably used as a bandage or the like.

  The bandage is not only used to wrap around the application site such as the affected area and directly protect the application site, or to fix other protective members (gauze etc.) to the application site, but when it has elasticity In addition, it is also used for performing hemostasis of a wound part by a compression force at the time of winding using the stretchability, and improving swelling by promoting blood flow. In recent years, it has also been applied to compression therapy in which treatment is performed by compressing the affected area, such as treatment or improvement of varicose veins.

  As a method of giving stretchability to the bandage, 1) weaving a thread made of an elastic material such as an elastomer represented by rubber, or 2) a layer made of an elastic material such as an elastomer on a non-elastic material It has been conventionally known to combine or impregnate an elastic material, and many elastic bandages using such a method are commercially available.

  For example, Japanese Patent No. 3743966 (Patent Document 1) describes an elastic bandage that is provided with elasticity in the length direction by using an elastic yarn as a warp (warp). In addition, in Japanese Patent No. 5601919 (Patent Document 2), an elastic nonwoven fiber web imparted with stretchability by a method of loosening the stretched state of the elastic filament after the nonwoven fabric fiber is entangled with the stretched elastic filament. Is described. In Japanese translations of PCT publication No. 2014-515320 (Patent Document 3), an elastic composite article including a nonwoven fibrous cover web, a woven scrim, and a plurality of elastic yarns disposed therebetween is impregnated with an elastomer polymer binder. A composite article having stretchability and self-adhesive properties is described.

Japanese Patent No. 3743966 Japanese Patent No. 5600119 Special table 2014-515320 gazette

  Although the bandage can be applied to any part of the body, even if the conventional bandage has elasticity, when wrapped around a surface with surface irregularities such as a joint, for example, it is along the surface near the top of the convex part Although it can be wound and has good adhesion to the surface, the wound bandage does not sufficiently follow the surface in the periphery (indented portion), and the bandage may float from the surface. In this specification, when a sheet such as a bandage is wound around a portion having surface irregularities, the property that can be wound along the shape of the surface irregularities is referred to as “unevenness fit”.

  If the uneven fitting property is inferior, the bandage wound as described above may float, but in this case, it becomes loose and easily unraveled, or a desired compression force cannot be obtained. In addition, if the wire is wound while being pulled strongly in order to follow the unevenness of the surface, the blood circulation is hindered by the tightening, and there is a problem that the patient feels pain.

  An object of the present invention is to provide a fiber sheet with good unevenness fitting property that can be wound along the shape of surface unevenness even when wound with an appropriate strength, and a bandage using the same.

The present invention provides the following fiber sheet and bandage.
[1] It has a length direction and a width direction,
The fiber sheet whose bending resistance in the said width direction measured based on the handle ohm method of JIS L 1913 is 300 mN / 200 mm or less.

  [2] The fiber sheet according to [1], wherein the bending resistance in the width direction is smaller than the bending resistance in the length direction.

  [3] The fiber sheet according to [1] or [2], wherein the compressive elastic modulus measured according to JIS L 1913 is 85% or less.

  [4] The fiber sheet according to any one of [1] to [3], wherein the curved surface sliding stress is 3 to 30 N / 50 mm.

[5] The fiber sheet according to any one of [1] to [4], which is a nonwoven fabric sheet.
[6] The fiber sheet according to [5], wherein an average fineness of fibers constituting the nonwoven fabric sheet is 20 dtex or less.

[7] The fiber sheet according to [5] or [6], comprising crimped fibers.
[8] The fiber sheet according to any one of [1] to [7], which is a bandage.

  According to the present invention, it is possible to provide a fiber sheet having a good uneven fit and a bandage using the same.

It is a schematic diagram which shows the method of preparing the sample for measuring curved surface sliding stress. It is a cross-sectional schematic diagram which shows the sample for measuring curved surface sliding stress. It is a schematic diagram which shows the measuring method of curved surface sliding stress.

(1) Characteristics of Fiber Sheet The fiber sheet according to the present invention (hereinafter also simply referred to as “fiber sheet”) is a medical article such as a compression bandage used for hemostasis or compression therapy in addition to a general bandage. It is a fiber sheet which can be used suitably as. The fiber sheet has a rectangular sheet shape having a length direction and a width direction such as a tape shape or a belt shape (long shape).

  The fiber sheet has a bending resistance in the width direction of 300 mN / 200 mm or less, preferably 290 mN / 200 mm or less, more preferably 280 mN / 200 mm or less. For example, when the fiber sheet having a bending resistance of 300 mN / 200 mm or less in the width direction is wound so that the length direction thereof is the winding direction, the fiber sheet has a surface unevenness (due to the underlying bone in the joint or the like). Even when it is wound around a protruding portion or the like with an appropriate strength, it can be wound along the shape of the surface unevenness and has excellent unevenness fitting properties. The bending resistance in the width direction is usually 30 mN / 200 mm or more, preferably 50 mN / 200 mm or more, from the viewpoint of the strength of the fiber sheet.

  Note that “wrapping so that the length direction is the winding direction” is a normal mode when a long object such as a bandage is wound around the envelope, for example, when the envelope is a finger Is an example of winding a long bandage around a finger so that the width direction of the bandage and the length direction of the finger are parallel or approximately parallel.

  Conventionally, bandages with stretchability in the length direction by various methods are known, but even if the stretchability in the length direction is increased or only the stretchability in the length direction is increased, the uneven fit is sufficient. It is clear from the study of the present inventor that the problem cannot be improved. In contrast, the present invention focuses on the width direction rather than the length direction, and is based on the knowledge that the bending resistance in the width direction is an unexpectedly important factor for improving the uneven fit.

  By reducing the bending resistance in the width direction so as to be in the above range, while making the bending resistance in the length direction larger than the bending resistance in the width direction, the unevenness and strength of the fiber sheet, strength, It is effective in achieving a good balance between durability. The difference in bending resistance between the two is, for example, 10 mN / 200 mm or more, preferably 30 mN / 200 mm or more, more preferably 50 mN / 200 mm or more. The bending resistance in the length direction of the fiber sheet is, for example, 40 to 400 mN / 200 mm, and preferably 60 to 300 mN / 200 mm.

  The bending resistance of the fiber sheet is measured in accordance with JIS L 1913 handle ohmmeter method. According to the JIS standard, a sample having a width of 200 mm is used.

The fiber sheet preferably has a compressive elastic modulus Pe of 85% or less, and more preferably 80% or less. The compression elastic modulus Pe within this range is advantageous for improving the uneven fit. The lower limit of the compression elastic modulus Pe is not particularly limited and is, for example, 50%. The compression elastic modulus Pe is expressed by the following formula in accordance with JIS L 1913 “General nonwoven fabric test method”:
Pe = {(T ₁ '−T) / (T ₁ −T)} × 100
It is calculated from. T ₁ is the thickness [mm] when an initial load (0.5 kPa) is applied. T is the thickness [mm] when a load of 30 kPa is applied. T ₁ ′ is the thickness [mm] when the initial load is restored.

  When the fiber sheet has extensibility, for example, the functionality when applied as a bandage can be improved. By providing the fiber sheet with extensibility, for example, when the fiber sheet is used to fix a protective member such as gauze to the application site, the fixing force can be increased, or the application force is applied to the application site by winding. In the case of using a fiber sheet to provide the pressure, the pressing force can be increased. Moreover, when applying a fiber sheet to the site | parts which bend and stretch, such as a joint part, if the fiber sheet has extensibility, the operation | movement of bending and extension will become easy. Furthermore, having the extensibility of the fiber sheet is advantageous for improving the uneven fit.

  From the above points, the fiber sheet preferably has extensibility. In this specification, “having extensibility” means that 50% elongation stress is exhibited in at least one direction (first direction) in the sheet surface. The stress at 50% elongation is the stress at elongation when stretched at an elongation rate of 50% (immediately after stretching), and is measured by a tensile test according to JIS L 1913 “General Nonwoven Test Method”.

  From the viewpoint of uneven fitting and ease of bending and stretching, the fiber sheet preferably has good extensibility in at least the width direction as the first direction. This width direction can be a direction orthogonal to the flow direction (MD direction) of the fiber sheet in the manufacturing process, that is, the CD direction. The stress at 50% elongation in the transverse direction of the fiber sheet is preferably 0.1 to 20 N / 50 mm, more preferably 0.5 to 15 N / 50 mm, and still more preferably 1 to 12 N / 50 mm.

  On the other hand, in order to increase the fixing force and compression force of the fiber sheet, the fiber sheet preferably has good extensibility in the length direction. The stress at 50% elongation in the length direction of the fiber sheet is preferably 0.1 to 50 N / 50 mm, more preferably 0.5 to 30 N / 50 mm, and still more preferably 1 to 20 N / 50 mm. Increasing the stress at 50% elongation in the length direction is also advantageous for improving the uneven fit. The length direction of the fiber sheet can be the flow direction (MD direction) of the fiber sheet in the manufacturing process. The stress at 50% elongation in directions other than the width direction and the length direction is preferably 0.5 to 60 N / 50 mm, more preferably 1 to 45 N / 50 mm, and still more preferably 2 to 40 N / 50 mm.

  The fiber sheet preferably exhibits self-adhesion. In the present specification, “self-adhesiveness” refers to a property in which the fibers on the surface of the fiber sheet can be latched or fixed by being engaged or in close contact with each other. Having self-adhesion is advantageous when the fiber sheet is a bandage or the like. For example, when the fiber sheet is a bandage, after the bandage is wound around the application site, the wound fiber sheets are wound together by the operation of overlapping (or tearing and stacking) the end portion on the surface of the bandage underneath. It is pressed while being stretched, and the fiber sheets are bonded and fixed together to develop self-adhesion.

  Since the fiber sheet itself has self-adhesive properties, a layer made of a self-adhesive agent such as an elastomer or an adhesive is formed on the fiber sheet surface, or a stopper is provided for fixing the tip after winding. There is no need to For example, in JP-A-2005-095381 (Patent Document 4), an acrylic polymer (Claim 1) or latex (paragraphs [0004] to [0006]) is attached as a self-adhesive to at least one surface of a bandage base material. Is described. Forming a layer made of an elastomer such as latex on the surface of the fiber sheet is effective for improving the self-adhesion.

  However, the fiber sheet according to the present invention is preferably composed only of a non-elastomeric material, and more specifically is preferably composed only of fibers. When a layer composed of the elastomer as described above is formed on the fiber sheet surface or the fiber base material is impregnated with the elastomer, the bending resistance in the width direction tends to be relatively difficult to be in the above range. . In addition, the layer made of elastomer may cause skin irritation or allergy when wound around the application site.

  The self-adhesion property of the fiber sheet can be evaluated by curved surface sliding stress. From the viewpoint of self-adhesiveness, the fiber sheet has a curved slip stress of, for example, 3 N / 50 mm or more, preferably 5 N / 50 mm or more, and the curved slip stress is preferably larger than the breaking strength. Further, when desired, since the wound fiber sheet is relatively easy to unwind, the curved surface slip stress is preferably 30 N / 50 mm or less, more preferably 25 N / 50 mm or less. The curved surface slip stress is measured by using a tensile tester according to the method described in the section of Examples (FIGS. 1 to 3).

  The fiber sheet preferably has hand cutting properties. In this specification, “hand cutting property” means a property that can be broken (cut) by hand pulling. The hand cutting property of the fiber sheet can be evaluated by the breaking strength. From the viewpoint of hand cutting properties, the fiber sheet preferably has a breaking strength in at least one direction in the sheet surface of 5 to 100 N / 50 mm, more preferably 8 to 60 N / 50 mm, and still more preferably 10 to 40 N / 50 mm. is there. When the breaking strength is within the above range, it is possible to impart good hand cutting properties that can be broken (cut) relatively easily by hand. If the breaking strength is too high, the hand cutting property is lowered, and for example, it becomes difficult to cut the fiber sheet with one hand. On the other hand, if the breaking strength is too small, the strength of the fiber sheet is insufficient and the sheet is easily broken, and the durability and handleability are lowered. The breaking strength is measured by a tensile test according to JIS L 1913 “General Nonwoven Test Method”.

  At least one direction in the sheet surface is a tensile direction when the fiber sheet is cut by hand, and preferably the length direction. This length direction can be the MD direction. That is, when a fiber sheet is used as a bandage, the bandage is usually broken along the length direction after being wound around the application site while being stretched along the length direction, so the breaking strength is in the above range. The direction is preferably a length direction that is a tensile direction.

  The breaking strength in a direction other than at least one direction in the sheet surface, for example, the width direction or the CD direction is, for example, 0.1 to 300 N / 50 mm, preferably 0.5 to 100 N / 50 mm, more preferably 1 to 20 N. / 50 mm.

  Also from the viewpoint of hand cutting properties, the fiber sheet is preferably composed of only a non-elastomeric material, and more specifically is preferably composed of only fibers. When a layer made of an elastomer or the like is formed on the surface of the fiber sheet, hand cutting properties can be lowered.

  The fiber sheet has a breaking elongation in at least one direction in the sheet plane of, for example, 50% or more, preferably 60% or more, and more preferably 80% or more. It is advantageous to increase the stretchability of the fiber sheet when the elongation at break is in the above range. The elongation at break in at least one direction in the sheet surface is usually 300% or less, preferably 250% or less. The elongation at break is also measured by a tensile test according to JIS L 1913 “General Nonwoven Test Method”.

  At least one direction in the sheet plane is preferably the width direction from the viewpoint of uneven fitting and ease of bending and stretching. Moreover, from the viewpoint of extensibility in the length direction (for example, from the viewpoint of the above-described fixing force and compression force), the length direction is preferable. The breaking elongation in a direction other than at least one direction in the sheet surface is, for example, 10 to 500%, and preferably 100 to 350%.

  The fiber sheet has a recovery rate after 50% elongation in at least one direction in the sheet plane (recovery rate after 50% elongation), preferably 70% or more (100% or less), more preferably 80% or more, and even more preferably. Is 90% or more. If the 50% elongation recovery rate is within this range, it will be easy to follow the surface unevenness shape and bending / stretching operation of the part when it is wound around a part having surface unevenness such as a joint part or a part to be bent and stretched. It is advantageous for improving fit and ease of bending and stretching operation, and is advantageous for improving self-adhesion due to friction between the stacked fiber sheets. When the elongation recovery rate is excessively small, the bending operation of the part cannot be followed, the deformation of the fiber sheet caused by this operation does not return to the original, and the fixed fiber sheet is weakened.

  At least one direction in the sheet plane is preferably the width direction from the viewpoint of uneven fitting and ease of bending and stretching. Further, from the viewpoint of extensibility in the length direction (for example, from the viewpoint of the above-described fixing force and compression force), the length direction is preferable.

The recovery rate after 50% elongation is the residual strain (%) after the test when the load was removed immediately after the elongation rate reached 50% in the tensile test according to JIS L 1913 "General nonwoven fabric test method". Where X is the following formula:
Recovery rate after 50% elongation (%) = 100−X
Defined by

  The recovery rate after 50% elongation in a direction other than at least one direction in the sheet surface is, for example, 70% or more (100% or less), and preferably 80% or more.

The basis weight of the fiber sheet is preferably 30 to 300 g / m ² , more preferably 50 to 200 g / m ² . In order to further improve the uneven fit, the basis weight is preferably small. In this case, the basis weight is preferably 160 g / m ² or less. If the basis weight is excessively small, the strength of the fiber sheet, and consequently the durability, is lowered.

The thickness of the fiber sheet is, for example, 0.2 to 5 mm, preferably 0.3 to 3 mm, and more preferably 0.4 to 2 mm. When the weight per unit area and thickness are within this range, the balance between the uneven fitting property, the bendability when wound, the extensibility, the flexibility, the texture and the cushioning property becomes good. The density (bulk density) of the fiber sheet can be a value corresponding to the weight per unit area and thickness, for example, 0.03 to 0.5 g / cm ³ , preferably 0.04 to 0.4 g / cm ³ , and more. Preferably it is 0.05-0.25 g / cm < ³ >. From the viewpoint of further improving the unevenness fitting property, the density is more preferably 0.2 g / cm ³ or less.

The air permeability of the fiber sheet by the fragile method is preferably 0.1 cm ³ / (cm ² · sec) or more, more preferably 1 to 500 cm ³ / (cm ² · sec), and further preferably 5 to 300 cm ³ / ( cm ² · sec), particularly preferably 10 to 200 cm ³ / (cm ² · sec). When the air permeability is within this range, the air permeability is good and the hair is not easily peeled off.

(2) Configuration and production method of fiber sheet The fiber sheet is not particularly limited as long as it is composed of fibers, and can be, for example, a woven fabric, a non-woven fabric, a knit (knitted fabric) or the like. As described above, the fiber sheet has a rectangular sheet shape having a length direction and a width direction such as a tape shape or a belt shape (long shape). The fiber sheet may have a single layer structure or a multilayer structure composed of two or more fiber layers.

  As described above, the fiber sheet preferably has extensibility. Means for imparting stretchability and extensibility to the fiber sheet are as follows: 1) a method of gathering the fiber sheet substrate such as woven fabric, non-woven fabric, knit, etc. 2) comprising a stretchable material such as elastomer represented by rubber A method of weaving yarn into a fiber sheet, 3) a method of combining a non-stretchable fiber sheet substrate with a layer made of a stretchable material such as an elastomer, or impregnating a stretchable material, 4) of a fiber constituting a nonwoven fabric Examples thereof include a method using a crimped fiber crimped in a coil shape at least partially.

  Among the above, the fiber sheet according to the present invention preferably has the configuration 4). The gather process 1) is effective in that it can effectively impart stretchability, but it is relatively difficult to obtain a fiber sheet having a bending resistance of the gather in the width direction due to the corrugated shape of the gather. . According to the methods 2) and 3), it is possible to easily impart stretchability, but it is relatively difficult to obtain a fiber sheet in which flexibility is impaired and the bending resistance in the width direction is in the above range. It becomes.

  The fiber sheet is preferably composed of a nonwoven fabric, that is, a nonwoven fabric sheet, from the viewpoints of uneven fit, ease of bending of the joint when wound around the joint, self-adhesiveness, hand cutting, etc. More preferably, it is composed of a non-woven fabric containing crimped fibers crimped in a coil shape, and contains one or more (preferably all) of the above-mentioned crimped fibers and the above 1) to 3). More preferably, it is made of non-woven fabric. Particularly preferably, the nonwoven fabric sheet is composed only of the crimped fibers. The fiber sheet may be composed of a woven fabric or a knit (knitted fabric). However, since the fineness of the yarn (twisted yarn) constituting the fiber sheet is relatively large, the fiber sheet has a bending resistance in the width direction within the above range. Is relatively difficult to obtain. If a nonwoven fabric is used for this point, a sheet | seat can be comprised with the fiber with smaller fineness, and uneven | corrugated fitting property can be improved more.

  From the viewpoint of uneven fit, the average fineness of the fibers constituting the non-woven sheet is preferably 20 dtex or less, more preferably 15 dtex or less. The average fineness is preferably 0.5 dtex or more, and more preferably 1.0 dtex or more, from the viewpoint of the strength of the fiber sheet, and thus durability.

  The fiber sheet composed of the nonwoven fabric containing the crimped fibers is restrained or latched mainly by the crimped fibers being entangled with each other at their crimped coil portions without substantially fusing each fiber constituting the same. It is preferable to have a structured. Most (most) crimped fibers (axial core direction of the crimped fibers) are preferably oriented substantially parallel to the sheet surface. In the present specification, “orientated substantially parallel to the plane direction” means that a number of crimped fibers (axial direction of the crimped fibers) are locally in the thickness direction, for example, entangled by a needle punch. This means a state in which the portion oriented along the line does not exist repeatedly.

  In a fiber sheet composed of a nonwoven fabric including crimped fibers, preferably, the crimped fibers are oriented in a certain direction (preferably in the length direction) in the sheet surface, and adjacent or intersecting crimped fibers are These crimped coil portions are entangled with each other. Also in the thickness direction (or oblique direction) of the fiber sheet, the crimped fibers are preferably slightly entangled. The entanglement between the crimped fibers can be caused in the process of shrinking the fiber web that is the precursor of the fiber sheet.

  A crimped fiber (axial core direction of the crimped fiber) is oriented in a certain direction in the sheet surface, and the entangled nonwoven fabric exhibits good stretchability (including extensibility) in this direction. When the above-mentioned certain direction is, for example, the length direction, this stretchable nonwoven fabric is stretched when tension is applied in the length direction, so that the entangled crimped coil portion extends and returns to the original coil shape. High stretchability can be exhibited in the direction. This stretchable nonwoven fabric can exhibit excellent extensibility in a direction (for example, the width direction) orthogonal to the certain direction in the sheet surface. Moreover, the cushioning property and the softness | flexibility in a thickness direction can be expressed by the slight entanglement between the crimped fibers in the thickness direction of a nonwoven fabric, and, thereby, a nonwoven fabric can have a favorable touch and texture. Furthermore, the crimped coil part is easily entangled with other crimped coil parts by contact with a certain pressure. Self-adhesion can be expressed by the entanglement of the crimped coil portions.

  When a fiber sheet composed of non-woven fabric containing crimped fibers imparts tension in the orientation direction (preferably in the length direction) of the crimped fibers, the entangled crimped coil portion expands due to elastic deformation and further imparts tension. Then, since it finally dissolves, the cutting property (hand cutting property) is also good.

  As mentioned above, it is preferable that the nonwoven fabric which can comprise a fiber sheet contains the crimped fiber crimped to the coil shape. The crimped fibers are preferably oriented mainly in the surface direction of the nonwoven fabric, and preferably crimped substantially uniformly in the thickness direction. The crimped fiber can be composed of a composite fiber in which a plurality of resins having different thermal shrinkage rates (or thermal expansion rates) form a phase structure.

The composite fiber constituting the crimped fiber is a fiber having an asymmetric or layered (so-called bimetal) structure that causes crimping by heating due to the difference in thermal shrinkage rate (or thermal expansion rate) of a plurality of resins Crimped fiber). A plurality of resins usually have different softening points or melting points. The plurality of resins include, for example, polyolefin resins (low density, medium density or high density polyethylene, poly C _2-4 olefin resins such as polypropylene); acrylic resins (such as acrylonitrile-vinyl chloride copolymer) Acrylonitrile resins having acrylonitrile units, etc.); polyvinyl acetal resins (polyvinyl acetal resins, etc.); polyvinyl chloride resins (polyvinyl chloride, vinyl chloride-vinyl acetate copolymers, vinyl chloride-acrylonitrile copolymers, etc.); Polyvinylidene chloride resin (vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-vinyl acetate copolymer, etc.); Styrene resin (heat resistant polystyrene, etc.); Polyester resin (polyethylene terephthalate resin, polytrimethylene terephthalate resin, poly Butylene TV Poly C _2-4 alkylene arylate resin such as tartrate resin, polyethylene naphthalate resin, etc.) Polyamide resin (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, aliphatic polyamide system) Resin, semi-aromatic polyamide resin, polyphenylene isophthalamide, polyhexamethylene terephthalamide, aromatic polyamide resin such as poly-p-phenylene terephthalamide); polycarbonate resin (bisphenol A type polycarbonate, etc.); polyparaphenylene It can be selected from thermoplastic resins such as benzobisoxazole resin; polyphenylene sulfide resin; polyurethane resin; and cellulose resin (cellulose ester and the like). Further, each of these thermoplastic resins may contain other copolymerizable units.

  Among these, the plurality of resins are non-wet heat adhesive resins (or heat-resistant hydrophobic resins having a softening point or melting point of 100 ° C. or higher because the fibers do not melt and soften even when heat-treated with high-temperature steam. Or non-aqueous resins), for example, polypropylene resins, polyester resins, and polyamide resins are preferred, and aromatic polyester resins and polyamide resins are particularly preferred from the viewpoint of excellent balance of heat resistance and fiber-forming properties. It is preferable that at least the resin exposed on the surface of the composite fiber is a non-wet heat adhesive fiber so that the fiber does not melt even when the composite fiber (latently crimped fiber) constituting the nonwoven fabric is treated with high-temperature steam.

  The plurality of resins constituting the composite fiber may have different heat shrinkage rates, and may be a combination of resins of the same system or a combination of different resins.

  From the viewpoint of adhesion, the plurality of resins constituting the composite fiber are preferably a combination of resins of the same system. In the case of a combination of resins of the same system, a combination of a component (A) that forms a homopolymer (essential component) and a component (B) that forms a modified polymer (copolymer) is usually used. In other words, the homopolymer, which is an essential component, is crystallized more than the homopolymer by, for example, copolymerizing and modifying a copolymerizable monomer that lowers the crystallinity, melting point, or softening point. The melting point or the softening point may be lowered as compared with the homopolymer. Thus, a difference can be provided in the heat shrinkage rate by changing the crystallinity, the melting point or the softening point. The difference in melting point or softening point can be, for example, 5 to 150 ° C, preferably 40 to 130 ° C, and more preferably 60 to 120 ° C. The ratio of the copolymerizable monomer used for the modification is, for example, 1 to 50 mol%, preferably 2 to 40 mol%, more preferably 3 to 30 mol% (particularly 5 to 5 mol%) with respect to all monomers. 20 mol%). The mass ratio of the component forming the homopolymer and the component forming the modified polymer can be selected according to the structure of the fiber. For example, the homopolymer component (A) / modified polymer component (B) = 90/10 to 10/90, preferably 70/30 to 30/70, more preferably 60/40 to 40/60.

Since it is easy to produce latent crimpable conjugate fiber, the conjugate fiber is a combination of an aromatic polyester resin, in particular, a combination of a polyalkylene arylate resin (a) and a modified polyalkylene arylate resin (b). Preferably there is. The polyalkylene arylate resin (a) comprises an aromatic dicarboxylic acid (such as a symmetric aromatic dicarboxylic acid such as terephthalic acid or naphthalene-2,6-dicarboxylic acid) and an alkanediol component (such as ethylene glycol or butylene glycol). C _2-6 alkanediol and the like). Specifically, poly C _2-4 alkylene terephthalate resin such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) is used, and general PET having an intrinsic viscosity of 0.6 to 0.7 is usually used. PET used for fibers is used.

On the other hand, in the modified polyalkylene arylate resin (b), the copolymer component that lowers the melting point or softening point and crystallinity of the polyalkylene arylate resin (a), which is an essential component, is, for example, an asymmetric aromatic dicarboxylic acid. Examples include dicarboxylic acid components such as acids, alicyclic dicarboxylic acids, and aliphatic dicarboxylic acids, and alkanediol components and / or ether bond-containing diol components having a chain length longer than the alkanediol of the polyalkylene arylate resin (a). It is done. A copolymerization component can be used individually or in combination of 2 or more types. Among these components, as the dicarboxylic acid component, asymmetric aromatic dicarboxylic acid (isophthalic acid, phthalic acid, 5-sodium sulfoisophthalic acid, etc.), aliphatic dicarboxylic acid (C _6-12 aliphatic dicarboxylic acid such as adipic acid) Acid) and the like, and as the diol component, alkanediol (C _3-6 alkanediol such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, etc.), Polyoxyalkylene glycols (polyoxy C _2-4 alkylene glycols such as diethylene glycol, triethylene glycol, polyethylene glycol, and polytetramethylene glycol) are widely used. Of these, asymmetric aromatic dicarboxylic acid such as isophthalic acid, polyoxy C _2-4 alkylene glycol such as diethylene glycol, and the like are preferable. Further, the modified polyalkylene arylate resin (b) may be an elastomer having a C _2-4 alkylene arylate (ethylene terephthalate, butylene terephthalate, etc.) as a hard segment and (poly) oxyalkylene glycol or the like as a soft segment. .

  In the modified polyalkylene arylate resin (b), the proportion of the dicarboxylic acid component (such as isophthalic acid) for decreasing the melting point or softening point is the same as that of the dicarboxylic acid component constituting the modified polyalkylene arylate resin (b). It is 1-50 mol% with respect to the whole quantity, Preferably it is 5-50 mol%, More preferably, it is 15-40 mol%. Moreover, the ratio of the diol component (for example, diethylene glycol etc.) for lowering the melting point or the softening point is, for example, 30 mol% or less with respect to the total amount of the diol component constituting the modified polyalkylene arylate resin (b), Preferably it is 10 mol% or less (for example, 0.1-10 mol%). If the ratio of the copolymer component is too low, sufficient crimps are not expressed, and the form stability and stretchability of the nonwoven fabric after crimps are reduced. On the other hand, if the proportion of the copolymer component is too high, the crimping performance will be high, but it will be difficult to spin stably.

  The modified polyalkylene arylate resin (b) is a polyvalent carboxylic acid component such as trimellitic acid or pyromellitic acid, a polyol component such as glycerin, trimethylolpropane, trimethylolethane, or pentaerythritol, if necessary. May be included as a monomer component.

  The cross-sectional shape of the composite fiber (cross-sectional shape perpendicular to the longitudinal direction of the fiber) is a general solid cross-sectional shape, such as a round cross-section or an irregular cross-section [flat shape, elliptical shape, polygonal shape, 3-14 leaf shape, T Shape, H-shape, V-shape, dogbone (I-shape), etc.], and may be a hollow cross-section, but is usually a round cross-section.

  As a cross-sectional structure of the composite fiber, a phase structure formed of a plurality of resins, for example, a core-sheath type, a sea-island type, a blend type, a parallel type (side-by-side type or multilayer bonding type), a radial type (radial bonding type) ), Hollow radiation type, block type, random composite type and the like. Among them, a structure in which the phase portions are adjacent (so-called bimetal structure) or a structure in which the phase structure is asymmetric, for example, an eccentric core-sheath type or a parallel type structure is preferable because it is easy to cause spontaneous crimping by heating.

  In addition, when the composite fiber has a core-sheath type structure such as an eccentric core-sheath type, as long as it has a heat shrinkage difference from the non-wet heat adhesive resin of the sheath part located on the surface and can be crimped, the core part Is a wet heat adhesive resin (for example, a vinyl alcohol polymer such as ethylene-vinyl alcohol copolymer or polyvinyl alcohol) or a thermoplastic resin having a low melting point or softening point (for example, polystyrene or low density polyethylene). It may be comprised.

  The average fineness of the composite fiber is, for example, 0.1 to 20 dtex, preferably 0.5 to 10 dtex, more preferably 1 to 5 dtex. If the fineness is too small, it is difficult to produce the fiber itself, and it is difficult to secure the fiber strength. Moreover, it becomes difficult to express a beautiful coiled crimp in the step of expressing crimp. On the other hand, if the fineness is too large, it becomes difficult to adjust the bending resistance in the width direction to the above range, and it becomes difficult to express sufficient crimp.

  The average fiber length of the composite fiber is, for example, 10 to 100 mm, preferably 20 to 80 mm, and more preferably 25 to 75 mm. If the average fiber length is too short, the formation of the fiber web becomes difficult, and when crimps are expressed, the entanglement between the crimped fibers becomes insufficient, and it is difficult to ensure the strength and stretchability of the nonwoven fabric. . If the average fiber length is too long, it will be difficult to form a fiber web with a uniform basis weight, and many entanglements will occur between the fibers at the time of web formation. Sexual expression can be difficult. When the average fiber length is in the above range, some of the fibers crimped on the nonwoven fabric surface are appropriately exposed on the nonwoven fabric surface, so that the self-adhesiveness of the nonwoven fabric can be improved. Furthermore, the average fiber length in the above range is advantageous for obtaining good hand cutting properties.

  The composite fiber is a latent crimped fiber. When heat treatment is performed, crimp is developed (or becomes manifest), and becomes a fiber having a substantially coiled (spiral or helical spring-like) three-dimensional crimp.

  The number of crimps before heating (the number of machine crimps) is, for example, 0 to 30 pieces / 25 mm, preferably 1 to 25 pieces / 25 mm, and more preferably 5 to 20 pieces / 25 mm. The number of crimps after heating is, for example, 30 pieces / 25 mm or more (for example, 30 to 200 pieces / 25 mm), and preferably 35 to 150 pieces / 25 mm.

  As described above, the crimped fiber constituting the nonwoven fabric has a substantially coil-shaped crimp after the crimp is developed. The average curvature radius of a circle formed by the coil of crimped fibers is, for example, 10 to 250 μm, preferably 20 to 200 μm, and more preferably 50 to 160 μm. The average radius of curvature is an index that represents the average size of a circle formed by a coil of crimped fibers. If this value is large, the formed coil has a loose shape, in other words, the number of crimps. It means that it has a shape with few. In addition, when the number of crimps is small, the entanglement between the crimped fibers also decreases, and it becomes difficult to recover the shape with respect to the deformation of the coil shape. If the average radius of curvature is too small, the crimped fibers will not be entangled sufficiently, making it difficult to secure the web strength, and the stress at the time of deformation of the coil is too great, resulting in an excessively high breaking strength. It becomes difficult to obtain appropriate stretchability.

  In the crimped fiber, the average coil pitch (average crimped pitch) is, for example, 0.03 to 0.5 mm, preferably 0.03 to 0.3 mm, and more preferably 0.05 to 0.2 mm. . When the average pitch is excessively large, the number of coil crimps that can be expressed per fiber is reduced, and sufficient stretchability cannot be exhibited. When the average pitch is excessively small, the entangled crimped fibers are not sufficiently entangled, making it difficult to ensure the strength of the nonwoven fabric.

  The nonwoven fabric (fiber web) may contain other fibers (non-composite fibers) in addition to the composite fibers. Specific examples of non-composite fibers include, in addition to fibers composed of the above-mentioned non-wet heat adhesive resin or wet heat adhesive resin, cellulosic fibers [for example, natural fibers (cotton, wool, silk, hemp, etc.), semi-synthetic Fiber (acetate fiber such as triacetate fiber), regenerated fiber (rayon, polynosic, cupra, lyocell (for example, registered trademark: “Tencel” etc.))] and the like. The average fineness and average fiber length of the non-composite fiber can be the same as that of the composite fiber. Non-composite fibers can be used alone or in combination of two or more.

  It is preferable that the ratio (mass ratio) between the conjugate fiber and the non-conjugated fiber is appropriately adjusted so that the bending resistance in the width direction is within the above range. The ratio is, for example, conjugate fiber / non-conjugated fiber = 50/50 to 100/0, preferably 60/40 to 100/0, more preferably 70/30 to 100/0, and still more preferably 80/20 to 100/0, particularly preferably 90/10 to 100/0. By blending non-composite fibers, the balance between the strength and elasticity or flexibility of the nonwoven fabric can be adjusted.

  Nonwoven fabrics (fiber webs) are commonly used additives such as stabilizers (heat stabilizers, UV absorbers, light stabilizers, antioxidants, etc.), antibacterial agents, deodorants, fragrances, colorants (dyeing pigments, etc.) ), Fillers, antistatic agents, flame retardants, plasticizers, lubricants, crystallization rate retarders, and the like. An additive can be used individually or in combination of 2 or more types. The additive may be supported on the fiber surface or may be contained in the fiber.

  A fiber sheet composed of a nonwoven fabric including crimped fibers is a process of forming a fiber containing the above-described composite fiber (latent crimped fiber) (web forming process), and heating the fiber web to crimp the composite fiber. It can manufacture suitably by the method of including a process (heating process).

  As a method for forming a fiber web in the web forming process, a conventional method, for example, a spunbond method, a direct method such as a melt blow method, a card method using melt blow fibers or staple fibers, a dry method such as an air lay method, etc. Can be used. Among them, a card method using melt blown fibers or staple fibers, particularly a card method using staple fibers is widely used. Examples of webs obtained using staple fibers include random webs, semi-random webs, parallel webs, and cross-wrap webs.

  Prior to the heating step, an entanglement step of entanglement of at least some of the fibers in the fiber web may be performed. By carrying out this entanglement step, it is possible to obtain a nonwoven fabric in which the crimped fibers are appropriately entangled in the next heating step. The entanglement method may be a method of mechanical entanglement, but a method of entanglement by spraying or spraying (spraying) water is preferable. Entangling the fibers with a water stream is advantageous in increasing the density of entanglement due to crimping in the heating process. The water to be sprayed or sprayed may be sprayed from one side of the fiber web or may be sprayed from both sides, but it is preferable to spray from both sides in order to efficiently perform strong entanglement.

  The water ejection pressure in the entanglement step is, for example, 2 MPa or more, preferably 3 to 12 MPa, more preferably 4 to 10 MPa so that the fiber entanglement is in an appropriate range. The temperature of the water sprayed or injected is 5-50 degreeC, for example, Preferably it is 10-40 degreeC.

  As a method of spraying or injecting water, a method of injecting water using a nozzle having a regular spray area or spray pattern is preferable from the viewpoint of simplicity and the like. Specifically, water can be sprayed on a fiber web transported by a belt conveyor such as an endless conveyor while being placed on the conveyor belt. The conveyor belt may be water-permeable, and water may be sprayed onto the fiber web by passing the water-permeable conveyor belt from the back side of the fiber web. In addition, in order to suppress scattering of the fiber due to the jet of water, the fiber web may be wetted with a small amount of water in advance.

  A nozzle for spraying or spraying water may be a plate or die in which predetermined orifices are continuously arranged in the width direction, and may be arranged so that the orifices are arranged in the width direction of the fiber web to be supplied. There may be one or more orifice rows, and a plurality of rows may be arranged in parallel. A plurality of nozzle dies having one orifice row may be installed in parallel.

  Prior to the above-described entanglement step, a step of unevenly distributing fibers in the fiber web in a plane (unevenly distributed step) may be provided. By carrying out this step, a region where the fiber density is sparse is formed in the fiber web, so that when the entanglement step is hydroentanglement, the water flow is efficiently injected into the fiber web. This makes it easy to achieve moderate entanglement not only on the surface of the fiber web but also on the inside.

  The uneven distribution process can be performed by spraying or jetting low-pressure water onto the fiber web. Spraying or spraying low pressure water onto the fibrous web may be continuous, but is preferably sprayed intermittently or periodically. By spraying water on the fiber web intermittently or periodically, a plurality of low density portions and a plurality of high density portions can be alternately formed periodically.

  The water ejection pressure in the uneven distribution step is desirably as low as possible, for example, 0.1 to 1.5 MPa, preferably 0.3 to 1.2 MPa, and more preferably 0.6 to 1.0 MPa. The temperature of the water sprayed or injected is 5-50 degreeC, for example, Preferably it is 10-40 degreeC.

  The method for spraying or spraying water intermittently or periodically is not particularly limited as long as it is a method capable of alternately and periodically forming a density gradient on the fiber web. A method of injecting water through the formed plate-like material (perforated plate or the like) having a regular spray area or spray pattern is preferable.

  In the heating step, the fiber web is heated with high temperature steam and crimped. In the method of treating with high temperature steam, the fiber web is exposed to a high temperature or superheated steam (high pressure steam) stream, which causes coil crimps in the composite fibers (latent crimped fibers). Since the fiber web has air permeability, even when the treatment is performed from one direction, the high-temperature water vapor penetrates into the inside, and a substantially uniform crimp is expressed in the thickness direction, and the fibers are entangled uniformly. .

  The fiber web shrinks simultaneously with the high temperature steam treatment. Therefore, it is desirable that the fibrous web to be supplied is over-feed according to the area shrinkage rate of the target nonwoven fabric immediately before being exposed to high-temperature steam. The ratio of overfeed is 110 to 300%, preferably 120 to 250%, with respect to the length of the target nonwoven fabric.

  A conventional steam jetting device can be used to supply steam to the fiber web. The steam spraying device is preferably a device capable of spraying steam substantially uniformly over the entire width of the fiber web at a desired pressure and amount. The steam spraying device may be provided only on one side of the fiber web, or may be provided on the other side in order to perform steam treatment on the front and back of the fiber web at once.

  Since the high-temperature steam sprayed from the steam spraying apparatus is an air stream, unlike the water entanglement process or the needle punch process, the high-temperature steam enters the fiber web without largely moving the fibers in the fiber web. Due to the ingress action of the water vapor flow into the fiber web, the water vapor flow effectively covers the surface of each fiber present in the fiber web, enabling uniform heat crimping. Moreover, since heat can be sufficiently conducted to the inside of the fiber web as compared with the dry heat treatment, the degree of crimping in the surface direction and the thickness direction becomes substantially uniform.

  The nozzle for injecting high-temperature steam is also a plate or die in which predetermined orifices are continuously arranged in the width direction, and the orifice in the width direction of the fiber web to be supplied is the same as the nozzle for water entanglement. May be arranged in a line. There may be one or more orifice rows, and a plurality of rows may be arranged in parallel. A plurality of nozzle dies having one orifice row may be installed in parallel.

  The pressure of the high temperature steam to be used can be selected from the range of 0.1 to 2 MPa (for example, 0.2 to 1.5 MPa). When the pressure of water vapor is too high, the fibers forming the fiber web may move more than necessary to cause formation disturbance or the fibers may be entangled more than necessary. If the pressure is too weak, it will not be possible to give the fiber web the amount of heat necessary to develop the crimp of the fibers, or water vapor will not be able to penetrate the fiber web, resulting in uneven expression of the fibers in the thickness direction. It's easy to do. The temperature of the high-temperature steam can be selected from the range of 70 to 180 ° C. (for example, 80 to 150 ° C.) although it depends on the material of the fiber. The processing speed of the high-temperature steam can be selected from a range of 200 m / min or less (for example, 0.1 to 100 m / min).

  After the crimping of the composite fiber in the fiber web is expressed in this way, moisture may remain in the nonwoven fabric. Therefore, a drying step for drying the nonwoven fabric may be provided as necessary. As a drying method, a method using a drying equipment such as a cylinder dryer or a tenter; a non-contact method such as far-infrared irradiation, microwave irradiation, or electron beam irradiation; a method of blowing hot air or passing through hot air, etc. Can be mentioned.

  Examples of the method for adjusting the bending resistance in the width direction within the above-described range in the fiber sheet manufacturing method as described above include, for example, a method of adjusting the content ratio of the composite fiber and the non-composite fiber; the high temperature used in the heating step Examples thereof include a method of adjusting water vapor conditions (particularly temperature and / or pressure); a method of adjusting the drying temperature in the drying step, and the like.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated further more concretely, this invention is not limited by these examples. In addition, each physical-property value in the fiber sheet (bandage) obtained by the following example and the comparative example was measured with the following method.

[1] Number of machine crimps (pieces / 25mm)
Measured according to JIS L 1015 “Testing method for chemical fiber staples” (8.12.1).

[2] Average coil crimp number (pieces / mm)
A crimped fiber (composite fiber) is extracted from the fiber sheet with care not to stretch the coil crimp, and in the same manner as the measurement of the number of mechanical crimps, JIS L 1015 “Testing method for chemical fiber staples” (8.12.1). ).

[3] Average crimp pitch (μm)
When measuring the average number of coil crimps, the distance between adjacent coils was measured, and the average value of n number = 100 was measured.

[4] Average radius of curvature (μm)
Using a scanning electron microscope (SEM), a photograph in which an arbitrary cross section of the fiber sheet was magnified 100 times was taken. Among the fibers shown in the photographed cross-section, for the fibers forming a spiral (coil) of one or more rounds, the radius of the circle when drawing a circle along the spiral (crimped from the coil axis direction) The radius of the circle when the fiber was observed was determined, and this was defined as the radius of curvature (μm). In addition, when the fiber has drawn the spiral in the ellipse shape, 1/2 of the sum of the major axis and the minor axis of the ellipse was used as the curvature radius. However, in order to exclude the case where the crimped fiber does not exhibit sufficient coil crimping or the case where the spiral shape of the fiber is reflected as an ellipse, the major axis and minor axis of the ellipse Only the ellipses whose ratio is in the range of 0.8 to 1.2 were measured. The average radius of curvature (μm) was determined as an average value of n number = 100.

[5] Fabric weight (g / m ² )
It measured according to JIS L 1913 "General nonwoven fabric test method".

[6] Thickness (mm) and density (g / cm ³ )
The thickness of the fiber sheet was measured according to JIS L 1913 “General nonwoven fabric test method”, and the density was calculated from this value and the basis weight measured by the method [5].

[7] Bending softness (mN / 200mm)
It measured according to the handle ohm method of JIS L 1913 "General nonwoven fabric test method". The width of the measurement sample was 200 mm. Measurement was performed for each of the length direction (MD direction) and the width direction (CD direction) of the fiber sheet.

[8] Breaking strength (N / 50mm) and breaking elongation (%)
It measured according to JIS L 1913 "General nonwoven fabric test method". Measurement was performed for each of the length direction (MD direction) and the width direction (CD direction) of the fiber sheet.

[9] 50% elongation stress (N / 50mm)
It measured according to JIS L 1913 "General nonwoven fabric test method". Measurement was performed for each of the length direction (MD direction) and the width direction (CD direction) of the fiber sheet.

[10] Recovery rate after 50% elongation A tensile test according to JIS L 1913 "General nonwoven fabric test method" was conducted, and the following formula:
Recovery rate after 50% elongation (%) = 100−X
Based on this, the recovery rate after 50% elongation was determined. In the formula, X is a residual strain (%) after the test when the load is removed immediately after the elongation reaches 50% in the tensile test. The recovery rate after 50% elongation was measured for each of the length direction (MD direction) and the width direction (CD direction) of the fiber sheet.

[11] Compression modulus Pe (%)
Based on JIS L 1913 "General nonwoven fabric test method", it calculated based on the above-mentioned formula.

[12] Curved slip stress (N / 50mm)
First, the fiber sheet was cut into a size of 50 mm width × 600 mm length so that the MD direction was the length direction, and Sample 1 was obtained. Next, as shown in FIG. 1A, after fixing one end of the sample 1 to the core 3 (polypropylene resin pipe roll having an outer diameter of 30 mm and a length of 150 mm) with the single-sided adhesive tape 2, Using the alligator clip 4 (grip width 50 mm, a 0.5 mm thick rubber sheet fixed to the inside of the mouth portion with double-sided tape for use) at the other end of sample 1, uniform over the entire width of sample 1 A weight 5 of 150 g was attached so that a load was applied to.

  Next, in a state in which the core 3 to which the sample 1 is fixed is lifted so that the sample 1 and the weight 5 are suspended, the core 3 is rotated five times so that the weight 5 is not greatly shaken, the sample 1 is wound up, and the weight 5 was lifted (see FIG. 1B). In this state, the contact between the cylindrical portion in the outermost peripheral portion of the sample 1 wound around the core 3 and the planar portion of the sample 1 not wound around the core 3 (the portion of the sample 1 wound around the core 3) And the boundary line with the portion of the sample 1 that is vertical due to the gravity of the weight 5) as a base point 6, and slowly move the alligator clip 4 and the weight 5 so that the base point 6 does not move and shift. Removed. Next, the outermost peripheral part of the sample 1 is cut with a razor blade so as not to damage the inner layer sample at the point 7 half-turned (180 °) along the sample 1 wound around the core 3 from the base point 6, A cut 8 was provided (see FIG. 2).

  The curved surface slip stress between the outermost layer portion in Sample 1 and the inner layer portion wound around the core 3 below (inner layer) was measured. A tensile tester (“Autograph” manufactured by Shimadzu Corporation) was used for this measurement. The winding core 3 is fixed to a jig 9 installed on the fixed side chuck base of the tensile tester (see FIG. 3), and the end of the sample 1 (the end to which the alligator clip 4 is attached) is attached to the load cell side chuck 10. Then, the sample was pulled at a pulling speed of 200 mm / min, and the measured value (tensile strength) when the sample 1 was detached (separated) at the cut 8 was defined as the curved surface sliding stress.

1. Fabrication of fiber sheet <Example 1>
As latent crimpable fibers, a polyethylene terephthalate resin [component (A)] having an intrinsic viscosity of 0.65 and a modified polyethylene terephthalate resin [component (B)] obtained by copolymerizing 20 mol% of isophthalic acid and 5 mol% of diethylene glycol are used. Constructed side-by-side type composite staple fiber [manufactured by Kuraray Co., Ltd., “Sophit PN780”, 1.7 dtex × 51 mm length, mechanical crimp number of 12/25 mm, 130 ° C. × 62 min. 25 mm] was prepared. Using 100% by mass of this side-by-side type composite staple fiber, a card web having a basis weight of 30 g / m ^{2 was} obtained by a card method.

  This card web is moved on a conveyor net, passed between a perforated plate drum with holes (circular shape) in a zigzag pattern with a diameter of 2 mmφ and a pitch of 2 mm, and from the inside of the perforated plate drum toward the web and the conveyor net. Then, a water flow was sprayed at 0.8 MPa in the form of a spray to carry out an uneven distribution step of periodically forming low density regions and high density regions of fibers.

  Next, this card web was transferred to the heating step while overfeeding the web to about 200% so as not to inhibit the shrinkage in the heating step with the next steam.

  Next, the card web is introduced into a water vapor jetting device provided in the belt conveyor, and water vapor treatment is performed by jetting water vapor of 0.5 MPa and a temperature of about 160 ° C. perpendicularly to the card web from the water vapor jetting device. The coiled crimps of the crimped fibers were developed and the fibers were entangled. In this steam spraying device, nozzles are installed in one conveyor so as to spray steam toward the card web via a conveyor belt. In addition, the hole diameter of the steam spray nozzle is 0.3 mm, and an apparatus in which the nozzles are arranged in a line at a pitch of 2 mm along the conveyor width direction was used. The processing speed was 8.5 m / min, and the distance between the nozzle and the conveyor belt on the suction side was 7.5 mm. Finally, it was dried with hot air at 120 ° C. for 1 minute to obtain a stretchable fiber sheet.

  When the surface of the obtained fiber sheet and the cross section in the thickness direction were observed with an electron microscope (100 times), each fiber was oriented substantially parallel to the surface direction of the fiber sheet, and crimped substantially uniformly in the thickness direction. Was.

<Example 2>
A stretchable fiber sheet was produced in the same manner as in Example 1 except that the temperature of hot air drying was 140 ° C. When the surface of the obtained fiber sheet and the cross section in the thickness direction were observed with an electron microscope (100 times), each fiber was oriented substantially parallel to the surface direction of the fiber sheet, and crimped substantially uniformly in the thickness direction. Was. In addition, in Example 1, Example 2, and Comparative Example 1 described later, the basis weight of the card web used is the same (30 g / m ² ).

<Comparative Example 1>
A stretchable fiber sheet was produced in the same manner as in Example 1 except that the temperature of hot air drying was 160 ° C. When the surface of the obtained fiber sheet and the cross section in the thickness direction were observed with an electron microscope (100 times), each fiber was oriented substantially parallel to the surface direction of the fiber sheet, and crimped substantially uniformly in the thickness direction. Was.

<Comparative example 2>
One side of a commercially available polyester spunbond nonwoven fabric (“Ecule 3201A” manufactured by Toyobo Co., Ltd.) having a three-layer structure comprising a spunbond nonwoven fiber layer / meltblown nonwoven fiber layer / spunbond nonwoven fiber layer. , Gathered by melt-bonding a commercially available polyurethane meltblown non-woven fabric (“Meltblown UC0060” manufactured by Clarek Laurex Co., Ltd.) with heat embossing at 130 ° C. while stretching 1.5 times. As a result, a stretchable fiber sheet was produced.

2. Evaluation of Fiber Sheet The following evaluation test was performed on the obtained fiber sheet.

(Uneven fit)
The fiber sheet with a width of 5 cm is wound around each of the index finger, wrist and ankle for 3 turns while stretching 30%. A score was sought.

Score 5: I do not feel any floating of the fiber sheet even in the dent.
Score 4: I do not feel the floating of the fiber sheet.
Score 3: Feel the floating of the fiber sheet a little,
Score 2: Strongly feel the floating of the fiber sheet,
Score 1: The fiber sheet feels very strong.

  1 sample, 2 single-sided adhesive tape, 3 roll core, 4 alligator clip, 5 spindles, 6 base points, 7 half-turns from the base point, 8 cuts, 9 jig, 10 chuck.

Claims (8)

Having a length direction and a width direction,
The fiber sheet whose bending resistance in the said width direction measured based on the handle ohm method of JIS L 1913 is 300 mN / 200 mm or less.   The fiber sheet according to claim 1, wherein the bending resistance in the width direction is smaller than the bending resistance in the length direction.   The fiber sheet according to claim 1 or 2, wherein the compression elastic modulus measured in accordance with JIS L 1913 is 85% or less.   The fiber sheet according to any one of claims 1 to 3, wherein the curved surface sliding stress is 3 to 30 N / 50 mm.   The fiber sheet according to any one of claims 1 to 4, which is a non-woven sheet.   The fiber sheet according to claim 5, wherein an average fineness of fibers constituting the nonwoven fabric sheet is 20 dtex or less.   The fiber sheet according to claim 5 or 6, comprising crimped fibers.   The fiber sheet according to any one of claims 1 to 7, which is a bandage.

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