TWI793209B - Fiber structure, bandage and method for producing fiber structure - Google Patents

Abstract

The present invention relates to a fiber structure, which is a fiber structure comprising coil-shaped crimped fibers (a) and non-coil-shaped crimped fibers (b), the fiber structure having coil-shaped crimped fibers (a) The distance between the entangled portion (A) and the entangled portion (B) composed of non-coiled crimped fibers (b), and at least one entangled portion (B) in the flow direction of the fiber structure is The apparent average fiber length of the aforementioned coil-shaped crimped fiber (a) is not reached.

Description

Fiber structure, bandage and method for producing fiber structure

The present invention relates to a fiber structure applicable as a bandage and a method for producing the same.

Conventionally, various bandages, body protectors and the like have been used for the purpose of compressing, fixing, and protecting applicable parts such as limbs or affected parts in the fields of medicine and sports. For such belts, in addition to stretchability, followability, sweat absorption, air permeability, etc., self-adhesive or adhesive fixation is also required.

In general, soft components such as rubber or acrylic latex are coated on the surface of the bandage for the purpose of satisfying stretchability or fixability (Patent Documents 1 to 5). However, these soft components also include irritation to the skin or stuffy heat caused by the blockage of ventilation, which may further cause allergies, which is unfavorable from a safety point of view.

For the purpose of reducing skin irritation, there are proposals for medical materials using low-protein natural rubber latex as an adhesive (Patent Document 6), or self-adhesive bandages using a specific acrylic polymer as an adhesive (Patent Document 7) . However, adhesives are also used invariably in these medical materials or self-adhesive bandages, which cannot be solved fundamentally.

As a self-adhesive non-woven fabric without an adhesive, there is a proposal to use a composite fiber with potential heat shrinkability, stretchability, and a non-woven fabric that can be easily torn by hand (Patent Document 8), or a non-woven fabric that can be reused High-stress stretchable nonwoven fabric (Patent Document 9).

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Publication No. 48-000309

[Patent Document 2] Japanese Patent Application Laid-Open No. 63-068163

[Patent Document 3] Japanese Patent Laid-Open No. 63-260553

[Patent Document 4] Japanese Patent Application Laid-Open No. 01-19035

[Patent Document 5] Japanese Patent Application Laid-Open No. 11-089874

[Patent Document 6] Japanese National Publication No. 2003-514105

[Patent Document 7] Japanese Patent Laid-Open No. 2005-095381

[Patent Document 8] International Publication No. 2008/015972

[Patent Document 9] International Publication No. 2016/031818

However, it is known that the nonwoven fabric described in Patent Document 8 is easily torn when tightly wound up. In addition, it is known that the nonwoven fabric described in Patent Document 9 has the property of being difficult to tear even when it is tightly wound up because of its high stress, but it also tends to have high stress at low elongation. There is room for improvement.

Therefore, the object of the present invention is to provide a fiber structure which is very low stress at low elongation and excellent in initial compliance, but becomes very high stress at high elongation, can be tightly wound up, and is easy to elongate. Not easy to break.

The present inventors have found that the nonwoven fabric described in Patent Document 8 has low strength and is easily stretched due to entanglement of developed curls, but is easily cut. In addition, it is known that the nonwoven fabric obtained by entanglement by water needle method or needle padding method described in Patent Document 9, followed by high-speed water vapor treatment, is that the sheet itself will be entangled, and the displayed curl will not occur, so it is difficult to obtain shrinkability. .

In order to achieve the above object, the inventors of the present invention devoted themselves to examination and found that if it is a fiber structure, it has an entangled part (A) composed of coiled crimped fiber (a) and a non-coiled crimped fiber (a). Two or more entangled parts (B) made of fibers (b), the distance between at least one entangled part (B) in the flow direction of the fiber structure is less than the aforementioned coil-shaped crimped fiber (a ) The apparent average fiber length can achieve the above purpose.

That is, in the present invention, the following are included. [1] A fiber structure comprising a coiled crimped fiber (a) and a non-coiled crimped fiber (b), the fiber structure having a coiled crimped fiber (a) The entangled part (A) and two or more entangled parts (B) composed of non-coil-shaped crimped fibers (b), at least one entangled part (B) in the flow direction of the fiber structure The distance between them is less than the apparent average fiber length of the aforementioned coil-shaped crimped fiber (a). [2] The fiber structure according to [1], wherein the ratio of the area of the entangled portion (A) to the surface area of the fiber structure is 20 to 85% on the surface of the fiber structure. [3] The fiber structure according to [1] or [2], wherein the ratio of the thickness (T A ) of the entangled portion ( _A ) to the thickness (T B ) of the entangled portion ( _B ) is T _A /T _B =1.1~10. [4] The fiber structure according to any one of [1] to [3], wherein in the flow direction of the fiber structure, the stress at 50% stretching is 15N/5cm or less, and the stress at 80% stretching is 20N /5cm or more. [5] The fiber structure according to any one of [1] to [4], wherein the ratio of the stress at 50% elongation to the stress at 80% elongation in the flow direction of the fiber structure is 80% elongation stress/50 The stress at % elongation is 2.7 or more. [6] The fiber structure according to any one of [1] to [5], wherein the coiled crimped fiber (a) is composed of a composite fiber having a phase structure formed of a plurality of resins having different thermal shrinkage rates . [7] The fiber structure described in any one of [1] to [6], which has a weight per unit area of 50 to 200 g/m ² . [8] A bandage comprising the fiber structure according to any one of [1] to [7]. [9] A production method, which is a production method of the fiber structure described in any one of [1] to [8], comprising: (1) a step of networking the fibers, (2) using water A step of spraying or spraying to entangle a part of the web to form the entangled part (B), and (3) a step of heating the web with high-temperature steam to form the entangled part (A).

The fiber structure of the present invention is suitable for bandages and the like because it has excellent initial conformability and can be tightly wound up.

[Mode of Carrying Out the Invention]

[fiber structure] The fiber structure of the present invention (hereinafter also referred to simply as "fibrous structure") has an intertwined portion (A) composed of coiled crimped fibers (a) and a non-coiled crimped fiber (b). The entanglement part (B). The fiber structure system of the present invention has a structure in which the coiled crimped fibers (a) are intertwined with each other by their crimped coils in the entangled part (A) to be restrained or hooked. On the other hand, in the entangled portion (B), the entangled portion is formed by compressing the fibers without relying on crimping of the non-coiled crimped fiber (b). Coil-shaped crimped fibers (a) and non-coil-shaped crimped fibers (b) are preferably aligned in the flow direction of the fiber structure, and coil-shaped crimped fibers (a) are preferably crimped along this alignment axis. into a coil shape.

The so-called flow direction of the fiber structure refers to the flow direction (MD direction) of the fiber structure in the process. When the fiber structure, such as a bandage, has a length direction and a width direction, the length direction is preferred. In this case, the fibrous structure that becomes the bandage can be wound around the application site while stretching along its longitudinal direction. When the fiber structure has a longitudinal direction and a width direction, the CD direction, which is a direction perpendicular to the MD direction, is preferably the width direction.

In the fiber structure system of the present invention, the fibers are relatively weakly entangled with each other in the entanglement part (A), so the stress is very low when stretched, and the initial compliance is excellent. Also, since the fibers are strongly entangled with each other in the entanglement portion (B), the stress becomes very high at high stretch and can be wound tightly.

In the fiber structure of the present invention, the distance between at least one of the entangled parts (B) in the flow direction of the fiber structure (hereinafter, also referred to simply as "the distance between the entangled parts (B)") does not reach the coil The apparent average fiber length of crimped fibers (a). The so-called distance between the entangled parts (B) in the flow direction of the fiber structure refers to any one entangled part (B) of the fiber structure and the closest to the entangled part (B) in the flow direction. The shortest distance in flow direction between other entangled parts (B). When the distance between the entangled parts (B) is more than the apparent average fiber length of the coil-shaped crimped fiber (a), the inter-entangled parts (B) are only crimped coils of the coil-shaped crimped fiber (a) Partially entangled, at high stretch, the entangled coils are partially stretched and finally untied, so there is a tendency to break easily in this part. On the other hand, if the distance between the entangled portions (B) does not reach the apparent average fiber length of the coiled crimped fiber (a), at least one end of the coiled crimped fiber (a) is tied to the entangled portion (B) ), the coiled crimped fiber (a) does not unravel even at high stretch, and tends to exhibit high stress at high stretch. From the above viewpoint, it is preferable that at least a part of the aforementioned coiled crimped fibers (a) have both ends entangled in the entanglement portion (B).

The two entangled portions (B) constituting the distance between the entangled portions (B) are preferably entangled in such a way that at least a part of them is entangled with the coiled crimped fiber (a) oriented in the flow direction configuration. When the entangled portion (B) is entangled with the coiled crimped fiber (a), high stress tends to be easily obtained at high elongation. The larger the number of coiled crimped fibers (a) entangled with the entangled portion (B), the more strongly entangled the entangled portion (B) with the coiled crimped fiber (a) tends to occur. When the fiber structure is in the form of a sheet, the entangled portion (B) can be regularly formed on the surface of the sheet, and the entangled portion (A) and the entangled portion (B) are preferably arranged as boundaries arranged alternately with respect to the flow direction. (border) pattern, a planar lattice pattern in which entangled parts (B) of a specific shape are regularly arranged, such as a square lattice pattern, a diagonal lattice pattern, a rectangular lattice pattern, etc. Fig. 1 shows the intertwined portion (B) 2, the intertwined portion (A) 3 and the distance 4 between the intertwined portion (B) of the fiber structure 1 having a rhomboid lattice pattern obtained in Example 1 described later .

When the intertwined part (B) is configured as a border-like pattern, the width (length in the flow direction) of the intertwined part (B) can be, for example, 0.5~30mm, preferably 1~20mm, more preferably 2~10mm , preferably 3~8mm.

When the intertwined parts (B) are arranged in a planar grid-like pattern, the middle interval in the direction perpendicular to the flow direction (the interval in the direction perpendicular to the "distance between intertwined parts (B)") can be, for example, 0.5 ~30mm, preferably 1~20mm, more preferably 2~10mm, most preferably 3~8mm.

When the intertwined part (B) is arranged in a planar lattice pattern, the shape of the intertwined part (B) is not particularly limited, for example, it can be oblong, oval, circular, square, rectangular, etc. Preferably it is oblong. In the case of an oblong shape, the length in the long axis direction is, for example, 1-80 mm, preferably 5-60 mm, more preferably 10-40 mm, and the length in the short-axis direction is, for example, 1-80 mm, preferably 3-50 mm. More preferably, it is 5~30mm.

The higher the ratio of the entangled parts (B) of the fiber structure system to the apparent average fiber length of the coiled crimped fibers (a), the easier it is to exhibit high stress at high elongation. Therefore, the fiber structure is, for example, more than 10% of the entangled parts (B) in the flow direction of the fiber structure, and the distance between them is less than the apparent average of the coiled crimped fiber (a). The fiber length is preferably 30% or more, more preferably 60% or more, especially preferably 90% or more, and most preferably 95% or more of the distance between the entangled parts (B) existing in the flow direction of the fiber structure. The apparent average fiber length of the coiled crimped fiber (a) is not reached.

The apparent average fiber length of the coil-shaped crimped fiber (a) (hereinafter, simply referred to as "apparent average fiber length") is not the fiber length obtained by elongating the fiber crimped into a coil shape into a straight line ( The actual fiber length), but the average value of the fiber length (apparent fiber length) in the state of being crimped into a coil. Therefore, the apparent average fiber length is measured shorter than the actual fiber length. The apparent average fiber length is measured by an electron microscope on the surface of the fiber structure, and among the coiled crimped fibers (a) present per 1 ^cm of the surface of any entangled portion (A) of the fiber structure, The apparent fiber lengths of 100 arbitrarily selected fibers were measured, and the average value thereof was obtained.

The apparent average fiber length may be, for example, not less than 10 mm, preferably not less than 10 mm, more preferably not less than 11 mm, especially preferably not less than 12 mm, and most preferably not less than 13 mm. On the other hand, the apparent average fiber length may be, for example, 70 mm or less, preferably 55 mm or less, more preferably 40 mm or less, especially preferably 30 mm or less, particularly preferably 21 mm or less.

The distance between the entangled parts (B) may be, for example, not less than 2.5 mm, preferably not less than 3 mm, more preferably not less than 3.5 mm. In addition, at least one of the distances between the entangled parts (B) may be, for example, 20 mm or less, preferably less than 20 mm, more preferably 15 mm or less, especially preferably 10 mm or less. When at least one of the distances between the entangled portions (B) is between the above upper limit and the lower limit, the entangled portions (B) are entangled with each other by coiled crimped fibers (a) , it becomes high stress at high elongation, and it tends to be difficult to be torn even when it is tightly wound.

In addition, in the present invention, the coiled crimped fiber (a) in the entanglement portion (B) may be contained in a small amount, for example, up to 3 mass % with respect to the total mass of the entanglement portion (B). In addition, in the entangled part (A), the non-coiled crimped fiber (b) may be contained in a small amount, for example, up to 3 mass % with respect to the total mass of the entangled part (A). Also, one fiber may have a coil crimped portion and a non-coil crimped portion.

In the fiber structure system, on the surface of the fiber structure, the ratio of the area of the entangled part (A) to the surface area of the fiber structure can be, for example, 20-85%, preferably 30-83%, more preferably 40-85%. 81%. The area of the entangled portion (A) is a value obtained by the measurement method described in Examples described later. When the area ratio of the entangled portion (A) is within the above range, the stress at low elongation becomes low, and excellent conformability tends to be easily obtained.

The ratio T _A /T _B of the thickness (T _A ) of the entangled part (A) of the fiber structure system and the thickness (T _B ) of the entangled part (B) can be, for example, 1.1~10, preferably 2~7, more preferably The best is 3~5. When the ratio T _A /T _B of the thickness (T _A ) of the entanglement portion (A) to the thickness (T _B ) of the entanglement portion (B) is within the above range, it is advantageous in terms of a good balance between softness and strength. .

The thickness (T _A ) of the entangled part (A) may be, for example, 1-10 mm, preferably 1.5-7 mm, more preferably 2-5 mm.

The thickness (T _B ) of the entangled part (B) may be, for example, 0.2-1 mm, preferably 0.3-0.9 mm, more preferably 0.4-0.8 mm.

The thickness (T A ) of the entangled part ( _A ) and the thickness (T B ) of the entangled part ( _B ) were measured in accordance with JIS L1913 "Test method for general staple fiber nonwoven fabrics".

The weight per unit area of the fiber structure is preferably from 50 to 200 g/m ² , more preferably from 70 to 180 g/m ² .

When the weight per unit area and the thickness are within the above-mentioned ranges, the stretchability, softness, texture and cushioning properties of the fiber structure are well-balanced. The density (bulk density) of the entangled parts (A) and (B) of the fiber structure may be a value corresponding to the above-mentioned basis weight and thickness. The density (bulk density) of the entangled portion (A) of the fiber structure may be, for example, 0.03-0.15 g/cm ³ , preferably 0.04-0.1 g/cm ³ . The density (bulk density) of the entangled portion (B) of the fiber structure may be a value corresponding to the above-mentioned weight per unit area and thickness, for example, 0.15-1.5 g/cm ³ , preferably 0.2-1 g/cm ³ .

The 50% tensile stress of the fiber structure in the flow direction of the fiber structure may be, for example, 15 N/5 cm or less, preferably 13 N/5 cm or less, more preferably 12 N/5 cm or less. When the stress at 50% elongation in the flow direction of the fiber structure is below the above-mentioned upper limit, the stress becomes low at low elongation, and the initial compliance tends to be excellent. The lower limit of the stress at 50% stretch in the flow direction of the fiber structure is not particularly limited, and may be 1 N/5 cm or more, for example.

The 80% tensile stress of the fiber structure system in the flow direction of the fiber structure may be, for example, 20 N/5 cm or more, preferably 25 N/5 cm or more, more preferably 30 N/5 cm or more. When the stress at 80% stretch in the flow direction of the fiber structure is above the above value, it becomes high stress at high elongation, and tends to be difficult to be torn even when tightly wound. The upper limit of the stress at 80% stretch in the flow direction of the fiber structure is not particularly limited, but is generally, for example, 50 N/5 cm or less.

Fiber structure system The ratio of the stress at 50% elongation to the stress at 80% elongation in the flow direction of the fiber structure is 80% elongation stress/50% elongation stress, for example, it can be 2.7 or more, preferably 3.0 or more, more preferably 3.2 or higher. When the ratio of the stress at 50% elongation to the stress at 80% elongation in the flow direction of the fiber structure is greater than or equal to the above lower limit value, the stress becomes low at low elongation, the initial compliance is excellent, and at the same time it becomes High stress, when it is tightly rolled up, it also tends not to be easily torn off. The ratio of the stress at 50% elongation to the stress at 80% elongation in the flow direction of the fiber structure is not particularly limited, for example, it can be 10 or less, preferably 8 or less, More preferably, it is 5 or less.

The stress at 50% elongation and the stress at 80% elongation in the flow direction of the fiber structure mean the stress at elongation immediately after elongation at 50% and 80% elongation in the flow direction of the fiber structure, which can be obtained by Measured by the tensile test of JIS L 1913 "Test methods for general nonwoven fabrics". The stress at 50% elongation and the stress at 80% elongation in the flow direction of the fiber structure of the present invention are values obtained by using AG-IS manufactured by Shimadzu Corporation as a constant-speed elongation type tensile testing machine.

The recovery rate after 50% elongation in at least one direction of the fiber structure system (hereinafter also referred to as the recovery rate after 50% elongation) can be, for example, 70% or more, preferably 80% or more, more preferably 90% or more. The upper limit of the recovery rate after 50% elongation is not particularly limited, but is usually 100% or less. When the 50% elongation recovery rate is in the above range, the followability to elongation is improved. For example, when using a fiber structure as a bandage, it can fully follow the shape of the place where it is used. At the same time, self-adhesion caused by friction between overlapping fiber structures Sexual enhancement is beneficial. In the case where the elongation recovery rate is too small, when the use part becomes a complicated shape, or when it moves during use, the fiber structure cannot follow the movement, or the part deformed by the body's activities does not return to its original shape, and the entanglement The fixation system of the fiber structure becomes weak.

The aforementioned at least one direction is preferably the flow direction of the aforementioned fiber structure. When the fiber sheet has a longitudinal direction and a width direction, such as a bandage, the longitudinal direction of the fiber sheet is preferable.

The recovery rate after 50% elongation is based on the tensile test in accordance with JIS L 1913 "Test method for general nonwoven fabrics". After the elongation reaches 50%, the residual strain (%) after the test when the load is immediately removed is taken as X , defined by the following formula; Recovery rate after 50% elongation (%)=100-X

The direction other than the at least one direction of the fiber structure, such as the CD direction, or the recovery rate after 50% elongation in the width direction when the fiber structure has a length direction and a width direction like a bandage, can be, for example, 70% or more ( 100% or less), preferably more than 80%.

The fiber structure preferably exhibits self-adhesiveness. The so-called "self-adhesiveness" in this specification refers to the property that the fibers on the surface of the fiber structure are superimposed (contacted) with each other, and these are interlocked or adhered to each other, and can be hooked or fixed. Self-adhesive is advantageous when the fiber structure is a bandage or the like. For example, when the fiber structure is a bandage, after wrapping the bandage around the site to be applied, the wound fiber sheets are stretched and pressed together by overlapping the ends of the bandage on the surface of the bandage underneath. Bonding and fixing fiber structures to each other exhibits self-adhesiveness.

Since the fiber structure is self-adhesive, it is not necessary to form a layer of self-adhesive such as an elastic body or an adhesive on the surface of the fiber structure, or to prepare additional buckles for fixing the wound front end. Tool. The fiber structure is preferably composed of only non-elastomeric materials, more specifically, preferably composed of only fibers. For example, Japanese Patent Laid-Open No. 2005-095381 (Patent Document 7, Claim 1, paragraphs [0004]~[0006]) describes that an acrylic polymer or latex is attached as a self-adhesive to at least one side of a bandage substrate. . However, when such an elastic layer is formed on the surface of the fibrous sheet and wrapped around the application site for a long time, troubles such as blood circulation disorder and pain may occur. Also, when the layer made of elastic body is wrapped around the application site, there is a possibility of inducing skin irritation or allergy.

The self-adhesiveness of the fiber structure can be evaluated by the sliding stress on the curved surface. The sliding stress of the curved surface of the fiber structure system can be, for example, more than 1N/50mm, preferably more than 3N/50mm, and the sliding stress of the curved surface is preferably higher than the breaking strength. Also, the curved surface sliding stress is preferably 30 N/50 mm or less, more preferably 25 N/50 mm or less, from the standpoint of relatively easy unwinding of the entangled fiber structure when desired. The sliding stress system on a curved surface can be performed using a tensile testing machine according to the method described in the items of the embodiment (Fig. 2 to Fig. 4).

The fiber structure preferably has hand-tearability. The "hand-tearability" in this specification refers to the property of breaking (tearing) by stretching by hand. The hand-tearability of the fiber structure can be evaluated by the breaking strength. When the fiber structure is in the form of a sheet, the breaking strength in at least one direction in the plane is preferably 5 to 100 N/50 mm, more preferably 8 to 60 N/50 mm, and most preferably 10 from the viewpoint of hand tearability. ~40N/50mm. Since the breaking strength is in the above-mentioned range, good hand-tearability that can be broken (teared) relatively easily by hand can be imparted. When the breaking strength is too high, the hand-tearability decreases, for example, it tends to be difficult to tear the fiber structure with one hand. Also, if the breaking strength is too small, the strength of the fiber structure will be insufficient and the fiber structure will be easily broken, and the durability and handleability will tend to be lowered. The breaking strength can be measured according to the tensile test of JIS L 1913 "Test methods for general nonwoven fabrics".

At least one in-plane direction of the above-mentioned sheet is the stretching direction when the fiber structure is torn by hand, preferably the flow direction of the above-mentioned fiber structure. When the fiber structure has a longitudinal direction and a width direction, such as a bandage, the longitudinal direction of the fiber structure is preferable. That is, when using a fiber structure as a bandage, after stretching the bandage along its longitudinal direction and wrapping it around the application site, it is usually broken in the longitudinal direction, so the flow direction is preferably the longitudinal direction of the stretching direction.

The breaking strength in the direction other than at least one direction in the sheet surface, such as the CD direction, or the width direction when the fiber sheet has a length direction and a width direction like a bandage, for example, can be 0.1~300N/50mm, preferably 0.5~100N/50mm, more preferably 1~20N/50mm.

From the viewpoint of hand-tearability, the fiber structure is preferably composed of only non-elastomeric materials, more specifically, it is preferably composed of only fibers. If a layer made of an elastic body or the like is formed on the surface of the fibrous structure, the hand-tearability may decrease.

The elongation at break in at least one direction of the fibrous structure system sheet can be, for example, not less than 50%, preferably not less than 60%, more preferably not less than 80%. When the elongation at break is within the above range, it is advantageous to increase the stretchability of the fiber structure. In addition, when the fiber structure is used as a bandage, it is possible to improve the followability when it is applied to places with large movements such as joints. The elongation at break in at least one direction of the above sheet is usually 300% or less, preferably 250% or less. The elongation at break can also be measured by a tensile test according to JIS L 1913 "Test methods for general nonwoven fabrics".

At least one direction in the plane of the sheet is preferably the first direction described above. The first direction may be the MD direction. When the fiber structure has a longitudinal direction and a width direction, such as a bandage, the longitudinal direction of the fiber structure is preferable.

The elongation at break in the direction other than at least one direction in the sheet surface, such as the CD direction, or the width direction when the fiber structure has a length direction and a width direction like a bandage, is preferably 10 to 500%, for example. 100~350%.

The coil-shaped crimped fiber (a) may be composed of a potentially heat-crimpable composite fiber (hereinafter, also simply referred to as "conjugated fiber").

Conjugated fiber is a composite fiber with multiple resins with different thermal contraction rate or thermal expansion rate to form a phase structure. Due to the difference in thermal contraction rate or thermal expansion rate, it has an asymmetrical or layered shape that crimps due to heating (so-called bimetallic) The fibers of structure. Plural resins usually have different softening points or melting points. The plurality of resins can be selected from, for example, polyolefin resins (such as low-density, medium-density or high-density polyethylene, polypropylene, etc. poly C _2-4 olefin resins, etc.), acrylic resins (such as acrylonitrile-chlorine Acrylonitrile-based resins having acrylonitrile units such as ethylene copolymers, etc.), polyvinyl acetal-based resins (such as polyvinyl acetal resins, etc.), polyvinyl chloride-based resins (such as polyvinyl chloride, vinyl chloride-vinyl acetate Copolymers, vinyl chloride-acrylonitrile copolymers, etc.), polyvinylidene chloride-based resins (such as vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-vinyl acetate copolymers, etc.), styrene-based resins ( Such as heat-resistant polystyrene, etc.), polyester resins (such as polyethylene terephthalate resin, polytrimethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate Polyester resins such as poly C _2-4 alkylene arylate resins, etc.), polyamide resins (such as polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610 , polyamide 612 and other aliphatic polyamide resins, semi-aromatic polyamide resins, polyphenylene isophthalamide, polyhexamethylene terephthalamide, polyparaphthalamide Aromatic polyamide resins such as phenyl terephthalamide, etc.), polycarbonate resins (such as bisphenol A polycarbonate, etc.), polyparaphenylene benzoxazole resins, polyphenylene Thermoplastic resins such as sulfur resins, polyurethane-based resins, and cellulose-based resins (such as cellulose esters, etc.). Furthermore, each of these thermoplastic resins may contain other copolymerizable units.

Among them, from the point of view that the fibers are not welded even if they are melted or softened by heat treatment with high-temperature water vapor, non-moist heat adhesive resins (or heat-resistant hydrophobic resins or non-moisture-resistant resins) with a softening point or melting point of 100° C. or higher are preferred. Water-based resins), such as polypropylene resins, polyester resins, and polyamide resins, etc., especially from the point of view of excellent balance between heat resistance and fiber formation properties, aromatic polyester resins and polyamide resins are more preferable. Amide-based resins. In the present invention, the resin exposed on the surface of the composite fiber is preferably a non-moist heat adhesive fiber so that the fibers constituting the fiber structure are not fused even if they are treated with high-temperature water vapor.

The plurality of resins constituting the conjugate fiber may be a combination of resins of the same system or a combination of different types of resins as long as they have different thermal shrinkage rates.

In the present invention, from the viewpoint of adhesiveness, it is preferable to constitute with a combination of resins of the same system. When combining resins of the same system, a combination of a homopolymer-forming component (A) and a modified polymer (copolymer)-forming component (B) is generally used. That is, by modifying the homopolymer, for example, by copolymerizing a copolymerizable monomer that lowers the crystallinity, melting point, or softening point, the crystallinity can be lowered than that of the homopolymer, or it can be made It becomes amorphous, and the melting point and softening point are lower than those of homopolymers. In this way, it is possible to provide a difference in heat shrinkage rate by changing crystallinity, melting point, or softening point. The difference in melting point or softening point may be, for example, 5 to 150°C, preferably 50 to 130°C, more preferably about 70 to 120°C. The ratio of the copolymerizable monomer used for modification is relative to all the monomers, for example, it can be 1-50 mol%, preferably 2-40 mol%, more preferably 3-30 mol% (especially about 5~20 mole%). The composite ratio (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, but the homopolymer component (A)/modified polymer component (B) can be, for example, 90/10~10/90, preferably 70/30~30/70, especially about 60/40~40/60.

From the point of view of easy manufacture of latent crimpable composite fibers, the composite fibers can be a combination of aromatic polyester resins, especially polyalkylene arylate resin (a) and modified polyalkylene arylate resin A combination of resins (b). The polyalkylene arylate resin (a) can be an aromatic dicarboxylic acid (symmetric aromatic dicarboxylic acid such as terephthalic acid, naphthalene-2,6-dicarboxylic acid, etc.) and an alkanediol component ( Homopolymers of _C2-6 alkanediols such as ethylene glycol or butanediol, etc.). Specifically, polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) polyalkylene terephthalate resins such as C _2-4 alkylene terephthalate, etc., usually use an intrinsic viscosity of 0.6 ~0.7 PET used in general PET fiber.

On the other hand, in the modified polyalkylene arylate-based resin (b), a copolymerization component that lowers the melting point, softening point, and crystallinity of the aforementioned polyalkylene arylate-based resin (a) can be used, For example, the dicarboxylic acid component of asymmetric aromatic dicarboxylic acid, alicyclic dicarboxylic acid, aliphatic dicarboxylic acid, etc., or the chain length is longer than the alkanediol of polyalkylene arylate resin (a) Alkanediol components and/or diol components containing ether linkages.

These copolymerization components can be used individually or in combination of 2 or more types. Among these components, as dicarboxylic acid components, asymmetric aromatic dicarboxylic acids (isophthalic acid, phthalic acid, 5-sodiumsulfoisophthalic acid, etc.), aliphatic dicarboxylic Acids (C _6-12 aliphatic dicarboxylic acids such as adipic acid), etc., and alkanediols (1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, etc.) are widely used as diol components Alcohol, neopentyl glycol and other C _3-6 alkanediols, etc.), polyoxyalkylene glycols (diethylene glycol, triethylene glycol, polyethylene glycol, polytetramethylene glycol, etc.) _2-4 enediol, etc.), etc. Among these, asymmetric aromatic dicarboxylic acids such as isophthalic acid, and oxidized C _2-4 olefinic diols such as diethylene glycol are preferred. Furthermore, the modified polyalkylene arylate resin (b) can also be C _2-4 alkylene arylate (ethylene terephthalate, butylene terephthalate, etc.) as the hard chain Segment, an elastomer with (poly)oxyalkylene diol as the soft segment.

In the modified polyalkylene arylate resin (b), as the dicarboxylic acid component, the ratio of the dicarboxylic acid component (for example, isophthalic acid, etc.) for lowering the melting point or softening point is relative to The total amount of the dicarboxylic acid component may be, for example, 1-50 mol%, preferably 5-50 mol%, more preferably about 15-40 mol%. As the diol component, the proportion of the diol component (for example, diethylene glycol, etc.) for lowering the melting point or softening point relative to the total amount of the diol component is, for example, preferably 30 mol% or less. It is 10 mol% or less (eg, about 0.1 to 10 mol%). If the ratio of the copolymerization component is too low, sufficient coil crimp will not be exhibited, and the form stability and stretchability of the fiber structure after crimp development will be reduced. On the other hand, if the ratio of the copolymerization component is too high, the performance of coil crimp development becomes high, but stable spinning becomes difficult.

The modified polyalkylene arylate resin (b) may contain polycarboxylic acid components such as trimellitic acid and pyromellitic acid, such as glycerin, trimethylolpropane, trimethylolethane, The polyhydric alcohol component of pentaerythritol, etc. are used as a monomer component.

The cross-sectional shape of the composite fiber (the cross-sectional shape perpendicular to the length direction of the fiber) is not limited to the general solid cross-sectional shape, circular cross-section or special-shaped cross-section [flat shape, ellipse shape, polygonal shape, 3~14 leaf shape, T-shaped, H-shaped, V-shaped, dog-bone (I-shaped), etc.], it can also be a hollow cross-section, etc., but it is usually a circular cross-section.

As the cross-sectional structure of the composite fiber, phase structures formed by multiple resins can be mentioned, such as core-sheath type, sea-island type, hybrid type, side-by-side type (side-by-side type or multi-layer bonding type), radial type (radial bonding type) type), hollow radial type, block type, random composite type, etc. Among these cross-sectional structures, a structure in which phases are partially adjacent (so-called bimetallic structure) or an asymmetrical phase structure such as eccentric Core-sheath type, side-by-side structure.

Furthermore, when the composite fiber has a core-sheath structure such as an eccentric core-sheath type, as long as the non-moist heat adhesive resin on the surface of the sheath has a thermal contraction difference and can be crimped, the core can also be heated by moist heat. Adhesive resins (such as ethylene-vinyl alcohol copolymers or vinyl alcohol-based polymers such as polyvinyl alcohol, etc.), or thermoplastic resins with low melting points or softening points (such as polystyrene or low-density polyethylene, etc.) constitute.

The average fineness of the composite fiber can be, for example, 1-5 dtex, preferably 1.3-4 dtex, more preferably 1.5-3 dtex. If the fineness is too fine, it will be difficult to manufacture the fiber itself, and it will be difficult to secure the fiber strength. In addition, in the step of developing crimps, it becomes difficult to develop beautiful coil-like crimps. On the other hand, if the fineness is too thick, the fiber becomes rigid and it becomes difficult to exhibit sufficient crimp.

The average fiber length (actual fiber length) of the conjugate fiber may be, for example, 20-70 mm, preferably 25-65 mm, more preferably 40-60 mm. If the fiber length is too short, it will be difficult to form a fiber web, and the intertwining of fibers will become insufficient in the step of developing crimp, making it difficult to secure strength and stretchability. Also, if the fiber length is too long, not only is it difficult to form a fiber web with a uniform weight per unit area, but also when the web is formed, the intertwining of the fibers occurs frequently, and when they are crimped, they interfere with each other. Demonstration of scalability becomes difficult. Furthermore, in the present invention, if the fiber length is within the above-mentioned range, a part of the fibers crimped on the surface of the fiber structure is properly exposed to the surface of the fiber structure, so the self-adhesiveness of the fiber structure can be improved.

The conjugated fiber is a fiber having a three-dimensional crimp in a roughly coiled (helical or helical spring) shape by applying heat treatment so that crimp appears (prominently).

The crimp number before heating (mechanical crimp number) can be, for example, 0-30 pieces/25mm, preferably 1-25 pieces/25mm, and more preferably 5-20 pieces/25mm. The number of crimps after heating can be, for example, 20-120 pieces/25mm, preferably 25-120 pieces/25mm.

The coiled crimped fiber (a) has a substantially coiled crimp as described above. The average radius of curvature of the circle formed by the coil of crimped fiber can be selected from the range of 10-250 μm, for example, 20-200 μm (for example, 50-200 μm), preferably 50-160 μm (for example, 60-200 μm). 150 μm), more preferably around 70-130 μm. Here, the average radius of curvature is an index indicating the average size of a circle formed by coils of crimped fibers. When this value is large, the formed coils have a loose shape, in other words, a shape with a small number of crimps. In addition, if the number of crimps is small, the intertwining of fibers becomes small, which tends to be disadvantageous in expressing sufficient stretchability. Conversely, when coil-like crimps with a too small average radius of curvature appear, the intertwining of fibers does not proceed sufficiently, and not only is it difficult to ensure the strength of the web, but also the production of latent crimped fibers exhibiting such crimps is greatly reduced. Difficult tendency.

In the coil-shaped crimped fiber (a), the average pitch of the coils is preferably 0.03-0.5 mm, more preferably 0.03-0.3 mm, and most preferably 0.05-0.2 mm.

The non-coil crimped fiber (b) may be composed of the conjugate fiber used for the above-mentioned coil crimp fiber (a), or may be composed of other fibers (non-conjugate fibers) other than the conjugate fiber. When the same conjugate fiber is used for the coiled crimped fiber (a) and the non-coiled crimped fiber (b), it tends to be advantageous in terms of simplicity of the manufacturing process. Also, regardless of the type of fiber constituting the coiled crimped fiber (a) and the non-coiled crimped fiber (b) in the fiber structure system, in the entanglement section (A) and/or the entanglement section (B), Other fibers (non-conjugated fibers) are contained in an amount within the range to achieve the object of the present invention.

As non-conjugated fibers, for example, in addition to the above-mentioned fibers composed of non-moist heat adhesive resins or wet heat adhesive resins, cellulose-based fibers [for example, natural fibers (cotton, wool, silk, hemp, etc.) , semi-synthetic fibers (acetate fibers such as triacetate fibers, etc.), regenerated fibers (rayon, polynosic, cupro, Lyocell) (for example, registered trade names: "Tencel" etc.) etc.] etc. The average fineness and average fiber length of non-conjugated fibers are the same as those of conjugated fibers. These non-conjugate fibers can be used alone or in combination of two or more. Among these non-composite fibers, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, polyolefin fibers such as polypropylene fibers and polyethylene fibers, polyester fibers, and polyamide fibers are preferable. wait. In particular, from the viewpoint of blendability and the like, fibers of the same type as the conjugate fiber may be used. For example, when the conjugate fiber is a polyester fiber, the non-conjugate fiber may be a polyester fiber.

When the fiber structure system includes composite fibers and non-conjugate fibers in the entanglement part (A) and/or entanglement part (B), the ratio (mass ratio) of the composite fibers to the non-conjugate fibers can be, for example, composite fibers/non-composite fibers Fiber = 80/20~100/0 (for example, 80/20~99/1), preferably 90/10~100/0, more preferably about 95/5~100/0, by mixing non-composite fibers , The strength of the fiber structure can be adjusted. However, if the proportion of the composite fiber (potentially crimped fiber) is too small, when the crimped fiber expands after crimping, especially when it shrinks after elongation, since the non-conjugated fiber acts as a resistance to the shrinkage, there is a guaranteed change in the recovery stress. Difficult tendency.

The fiber structure (fiber web) may further contain conventional additives such as stabilizers (heat stabilizers such as copper compounds, ultraviolet absorbers, light stabilizers, antioxidants, etc.), antibacterial agents, deodorants, fragrances, colorants (Dyes and pigments, etc.), fillers, antistatic agents, flame retardants, plasticizers, lubricants, crystallization speed retarders, etc. These additives can be used alone or in combination of two or more. These additives can be supported on the fiber surface or contained in the fiber. [Manufacturing method of fiber structure] The manufacturing method of the fiber structure of the present invention includes: 1) the step of networking the fibers (hereinafter also referred to as the networking step), 2) by spraying or spraying water, a part of the network is entangled to form entanglements. The step of merging part (B) (hereinafter also referred to as entanglement step 1), and 3) the step of forming entangled part (A) by heating the web with high-temperature steam (hereinafter also referred to as entanglement step 2).

In the networking step, as the method of forming the web, conventional methods such as direct methods such as spunbonding and melt-blowing methods, carding methods using melt-blown fibers or short fibers, etc., and dry methods such as air-laid methods can be used. law etc. Among these methods, a carding method using melt-blown fibers, short fibers, etc. is widely used, and a carding method using short fibers is particularly used. Examples of the web obtained using short fibers include a random web, a semi-random web, a parallel web, and a cross-ply web.

Next, in the entanglement step 1, a part of the resulting fiber web is entangled by spraying or spraying water to form an entangled portion (B). The water to be sprayed or sprayed may be sprayed from one side of the fiber web or from both sides, but it is preferable to spray from both sides from the viewpoint of efficient and strong intertwining. The portion sprayed with water becomes the entangled portion (B), and the portion not sprayed with water becomes the entangled portion (A) in the subsequent entanglement step 2.

As the method of forming the entanglement part (B), for example, it can be mentioned: through a plate (perforated plate, slit plate, etc.) or a roller (perforated roller) having a regular spray range or spray pattern formed with a plurality of holes. , slit roller, etc.), a method of spraying water from a spray nozzle, a method of forming the entangled part (B) by switching the spray of water from the spray nozzle, and a method combining them. These methods can be selected according to the shape or size of the fiber web, the shape or arrangement pattern of the formed entangled part (B), etc.: the spray nozzle is moved continuously or periodically, and the A method in which a conveyor such as an endless conveyor makes the fiber web continuously or periodically transferred, and a combination of these methods is carried out. For example, a spray nozzle may be installed in the drum, and the entangled portion (B) may be continuously formed by transferring the fiber web while spraying water while rotating the drum. The material constituting the plate and the roller can be metal, plastic, wood, etc., for example.

When the entanglement portion (A) and the entanglement portion (B) form an alternating side-by-side boundary pattern with respect to the direction of flow, the entanglement portion (B) can be obtained, for example, by forming A plate or roller with slits of a specific width is formed by spraying water from a spray nozzle onto a fiber web. The above-mentioned slit width may be, for example, 0.5-30 mm, preferably 1-20 mm, more preferably 2-10 mm, and most preferably 3-8 mm. The distance between the slits is, for example, 2.5 mm or more, preferably 3 mm or more, more preferably 3.5 mm or more. On the other hand, the distance between the slits may be, for example, 20 mm or less, preferably less than 20 mm, more preferably 15 mm or less, especially preferably 10 mm or less.

In addition, when forming the above-mentioned boundary pattern, the entanglement (B) can also be performed by, for example, continuously moving the fiber web while spraying water from spray nozzles arranged in a straight line with respect to the flow direction.

When the entangled part (B) having a specific shape forms a regularly arranged planar lattice pattern, the entangled part (B) can be sprayed from a spray nozzle, for example, by passing through a plate or a roller regularly formed with a plurality of holes. It is formed by spraying water onto the fiber web.

The shape of the hole is not particularly limited, for example, it can be oblong, oval, circular, square, rectangular, etc., preferably oblong. In the case of an oblong shape, the length of the major axis is, for example, 1-80 mm, preferably 5-60 mm, more preferably 10-40 mm, and the length of the minor axis is, for example, 1-80 mm, preferably 3-50 mm, more preferably The best is 5~30mm. The plurality of holes mentioned above can be arranged in a planar lattice pattern, such as a square lattice pattern, a diagonal lattice pattern, a rectangular lattice pattern, and the like. The distance between the holes may be, for example, greater than 2.5 mm, preferably greater than 3 mm, more preferably greater than 3.5 mm. On the other hand, the distance between the holes may be, for example, 20 mm or less, preferably less than 20 mm, more preferably 15 mm or less, especially preferably 10 mm or less.

The ejection pressure of water may be, for example, 4 MPa or higher, preferably 8 MPa or higher, more preferably 10 MPa or higher, especially preferably 15 MPa or higher, and particularly preferably higher than 15 MPa. When the jetting pressure of water is above the above-mentioned lower limit value, the fiber will be in a state of being pressed tightly, and even if steam injection is applied in the subsequent entangling step 2, the fiber will be fixed and not move, and it is difficult to develop a coil-like roll. Shrinkage, so there is a tendency to easily form entangled parts (B). On the other hand, the upper limit of the ejection pressure of water may be 20 MPa or less, for example.

The temperature of the water is preferably 5-50°C, more preferably 10-40°C, most preferably 15-35°C (normal temperature).

As a method of spraying or spraying water, a method of spraying water using a nozzle having a regular spray range or a spray pattern, etc. is preferred from the viewpoint of simplicity. Specifically, water may be sprayed with respect to the fiber web transferred by a belt conveyor such as a circulating conveyor in a state placed on a conveyor belt. The conveyor belt may be water-permeable, and the water-permeable conveyor belt may be passed from the back side of the fiber web to spray water onto the fiber web. When water is also sprayed from the back side of the fiber web, it is preferred to spray the water to the fiber web also on the back side of the fiber web through a plate or roller having a spray area or a spray pattern. Furthermore, in order to suppress the scattering of fibers due to the spray of water, the fiber web may be wetted with a small amount of water in advance. When transported by a conveyor, the transport speed may be, for example, 5-40 m/min, preferably 10-20 m/min.

Nozzles for spraying or spraying water, as long as they are in accordance with the pattern of the entangled part (B) formed, use a plate or die with designated orifices continuously side by side in the width direction, and the fiber web supplied thereto In the width direction, the holes can be arranged side by side. The number of orifice rows may be one or more, and plural rows may be arranged in parallel. Also, the nozzle dies having one row of orifices may be arranged in parallel in plural. The nozzle pitch may be, for example, 1.0-2.5 mm. Also, the nozzle diameter may be, for example, 0.2 to 0.5 mm.

In the entanglement step 2, the fiber web is heated with high-temperature water vapor, and the composite fibers in the portion not sprayed with water in the above entanglement step are crimped into coils to form the entanglement portion (A). In the method of treating with high-temperature steam, the fiber web is exposed to high-temperature or superheated steam (high-pressure steam) flow, whereby coil-like crimping occurs in the conjugate fiber (potentially crimped fiber). Due to the air permeability of the fiber web, even if it is processed from one direction, high-temperature water vapor penetrates into the inside, exhibits slightly uniform crimping in the thickness direction, and the fibers are evenly entangled with each other. The temperature of the high-temperature steam may be, for example, 50-150°C, preferably 40-130°C, more preferably 60-120°C.

The conjugated fibers in the portion not sprayed with water in the entanglement step 1 of the fiber web shrink simultaneously during the high-temperature steam treatment. Therefore, the supplied fiber web is preferably overfed according to the area shrinkage ratio of the intended fiber structure immediately before being exposed to high-temperature steam. With respect to the length of the target fiber structure, the ratio of overfeeding is preferably 110-250%.

In order to supply water vapor to the fiber web, customary water vapor injection devices can be used. The water vapor spraying device is preferably a device capable of spraying water vapor approximately uniformly over the entire width of the fiber web at a desired pressure and amount. The water vapor injection device can be installed only on one side of the fiber web, and can be further installed on the other side in order to steam treat the front and back of the fiber web at one time.

The high-temperature water vapor injected from the steam injection device is an air flow, so it can enter the inside of the fiber web without causing the fibers in the fiber web to move greatly, unlike the water flow entangling treatment and needle rolling treatment. Due to the entry of water vapor into the fiber web, the water vapor can effectively cover the surface of each fiber present in the fiber web, making uniform heat shrinkage possible. Also, compared to dry heat treatment, since heat can be sufficiently conducted to the inside of the fiber web, the degree of crimping in the plane direction and the thickness direction is substantially uniform.

The nozzles for spraying high-temperature water vapor are also the same as the above-mentioned nozzles for entanglement of water flow, as long as they use designated orifices continuously side by side in the width direction of plates or dies, in the width direction of the fiber web supplied thereto, It is enough to configure the holes side by side. The number of orifice rows may be one or more, and plural rows may be arranged in parallel. Also, the nozzle dies having one row of orifices may be arranged in parallel in plural.

The pressure of the high-temperature steam used can be selected from the range of 0.1~2MPa (for example, 0.2~1.5MPa). When the water vapor pressure is too high, the fibers forming the fiber web move more than necessary, and the texture may be disordered or the fibers may be entangled more than necessary. When the pressure is too weak, the heat required for fiber crimping cannot be imparted to the fiber web, or water vapor cannot penetrate the fiber web, and the fiber crimping in the thickness direction tends to become uneven. Although the temperature of the high-temperature steam depends on the material of the fiber, it can be selected from the range of 70-180°C (for example, 80-150°C). The processing speed of high-temperature water vapor can be selected from the range below 200m/min (for example, 0.1~100m/min).

After the crimp of the conjugate fibers in the fiber web develops in this way, since water may remain in the fiber structure, a drying step of drying the fiber structure may be provided if necessary. Examples of drying methods include methods using drying equipment such as drum dryers or tenter frames; non-contact methods such as far-infrared ray irradiation, microwave irradiation, and electron ray irradiation; methods of blowing hot air or passing it through hot air, etc. .

The fiber structure system of the present invention has excellent initial compliance, can be tightly rolled up, does not contain adhesives, and is self-adhesive, so it is suitable for applications that contact the human body, such as bandages or body protection belts used in medical or sports fields. . Another gist of the present invention is a bandage comprising the above-mentioned fiber structure.

Hereinafter, although an Example is shown and this invention is demonstrated more concretely, this invention is not limited to these examples. [Example]

Each physical property value of the fiber structure obtained in the Example and the comparative example was measured by the following method. (1) Apparent average fiber length The surface of the fiber structure was measured with an electron microscope, and the number of coiled crimped fibers (a) present per ¹ cm of the surface of any entangled portion (A) of the fiber structure In , the apparent fiber lengths of 100 arbitrarily selected fibers were measured, and the average value thereof was obtained. (2) The number of crimps was evaluated in accordance with JIS L1015 "Test methods for chemical fiber staple fibers" (8.12.1). (3) Weight per unit area was measured in accordance with JIS L1913 "Test methods for general staple fiber nonwoven fabrics". (4) Thickness (T _A ) of the entangled portion (A) (convex height) The thickness was measured in accordance with JIS L1913 "Test methods for general short-fiber nonwoven fabrics". (5) Thickness (T _B ) (base height) of the entangled portion (B) The thickness was measured in accordance with JIS L1913 "Test methods for general short-fiber nonwoven fabrics". (6) Density of entangled portion (A) The density was calculated from the weight per unit area measured in (3) above and the thickness measured in (4). (7) Density of the entangled portion (B) The density was calculated from the weight per unit area measured in (3) above and the thickness measured in (5). (8) Area ratio of entangled portion (A) The area ratio of entangled portion (A) present per 0.5 cm ² of the fiber structure is determined as follows, for example. Using an electron microscope, the surface of the fiber structure in 0.5 cm ² was observed at 300 magnifications. In one field of view observed with an electron microscope, the case where only crimped fibers are seen is defined as 1, the case where crimped fibers are mixed with other fibers is defined as 0.5, and the case where crimped fibers do not exist is defined as 0. Find The total was obtained, and the calculated total was taken as the area ratio of the entangled portion (A) with respect to the number of observed fields of view. (9) As a method of measuring the distance between the entangled portions (B), use a measuring stick to measure the distance between two points in the center of the entangled portion at the farthest point. (10) 50% elongation recovery rate is measured in accordance with JIS L1096 "Test methods for general fabrics". However, in the evaluation of the present invention, it is always regarded as the recovery rate of 50% elongation, and after returning to the original position after 50% elongation, there is no waiting time to enter the next action. In addition, the measurement was performed with respect to the flow (MD) direction of a fiber structure. AG-IS manufactured by Shimadzu Corporation was used as a constant-speed elongation type tensile tester. (11) Stress at elongation was measured in accordance with JIS L1096 "Testing methods for general fabrics". Each elongation stress at 50% and 80% elongation was measured. AG-IS manufactured by Shimadzu Corporation was used as a constant-speed elongation type tensile tester. (12) Self-adhesiveness The sliding stress (N/50mm) on a curved surface was measured by the following method. If it is 1N/50mm or more, it is regarded as having self-adhesiveness.

First, a fiber sheet was cut into a size of 50 mm wide x 600 mm long so that the MD direction became the longitudinal direction, and this was used as sample 5. Next, as shown in Fig. 2(a), after fixing one end of sample 5 to a core 7 (a tube roll made of polypropylene resin with an outer diameter of 30mm x a length of 150mm) with a single-sided adhesive tape 6, the At the other end, use crocodile clip 8 (clip width 50mm, and fix a rubber sheet with a thickness of 0.5mm on the inside of the mouth with double-sided tape when in use), and attach a 150g weight so that the load is evenly applied to the entire width of sample 5. Code 9.

Next, in a state where the sample 5 and the weight 9 are suspended, and the core 7 on which the sample 5 is fixed is lifted up, the core 7 is rotated 5 times in a manner that the weight 9 does not shake greatly, and the sample 5 is rolled up. And lift weight 9 (referring to Fig. 2 (b)). In this state, the junction of the cylindrical part of the outermost peripheral part of the sample 5 wound on the core 7 and the planar part of the sample 5 not wound on the core 7 (the sample wound on the core 7 5 and the boundary line of the sample 5 which is vertical due to the gravity of the weight 9) is taken as the base point 10, and the alligator clip 8 and the weight 9 are slowly removed in such a way that the base point 10 does not move and deviate. Next, cut off the outermost circumference of the sample 5 with a razor at the point 11 at the point 11 where the sample 5 wound on the mandrel 7 is wound half a circle (180°) from the base point 10, without damaging the sample in the inner layer. Part, the notch 12 is provided (refer to FIG. 3).

The curved surface sliding stress between the outermost layer portion of this sample 5 and the inner layer portion wound on the core 7 below (inner layer) was measured. In this measurement, a tensile testing machine ("Autograph" manufactured by Shimadzu Corporation) was used. In the jig 13 installed on the fixed-side chuck pedestal of the tensile testing machine, the winding core 7 (refer to FIG. 4 ) is fixed, and the end of the sample 5 is grasped by the chuck 14 on the load cell side (the alligator clip 8 is installed. end) was stretched at a tensile speed of 200 mm/min, and the measured value (tensile strength) when the sample 5 detached (separated) at the notch 12 was regarded as the curved surface sliding stress. <Example 1> As a latent crimping fiber, a polyethylene terephthalate resin [component (A)] with an intrinsic viscosity of 0.65, copolymerized with 20 mol% of isophthalic acid and diethylene glycol was prepared. Side-by-side composite short fibers made of 5 mol% modified polyethylene terephthalate resin [component (B)] [manufactured by KURARAY Co., Ltd., "Soffit PN780", 1.7dtex´51mm long, mechanical roll The number of shrinkage is 29 pieces/25mm, and the number of shrinkage after heat treatment at 130°C for 1 minute is 29 pieces/25mm]. Using 100% by mass of the side-by-side composite short fibers, a carded web having a weight per unit area of 30 g/m ² was obtained by a carding method. (Entangling step 1) Move the carded web on the conveyor net, and pass through the perforated rollers with oblong lattice-shaped openings (oblong shape) with a major axis dimension of 50 mm, a minor axis dimension of 5 mm, and a spacing of 15 mm. During this time, through the perforated drum, towards the net and the conveying net, a spray-like water flow is sprayed at 10 MPa to carry out the fiber entanglement step.

Then, this carded web is transferred to the entangling step 2 while overfeeding the web by about 200% in a manner that does not hinder the shrinkage in the entangling step 2 caused by the next water vapor. (Entangling step 2) Subsequently, the carded web is introduced into the water vapor spraying device equipped on the belt conveyor, and from the steam spraying device, 0.5 MPa and water vapor at a temperature of about 160 ° C are sprayed vertically to the carded web to give water vapor treatment, It exhibits the coil-like crimp of the potentially crimped fibers while intertwining the fibers. The water vapor injection device installs a nozzle in one side of the conveyor, and sprays water vapor to the carding web through the conveyor belt. Furthermore, the hole diameter of the water vapor injection nozzle is 0.3 mm, and the nozzles are arranged in a row at a pitch of 2 mm along the width direction of the conveyor. 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 sheet-shaped fiber structure 1 .

Various measurements were performed on the obtained fiber structure 1 . The results are shown in Table 1. 1 shows a schematic diagram of an arrangement pattern of entangled portions (B) 2 in the flow direction of the resulting fiber structure 1 .

<Example 2> A fiber structure was produced in the same manner as in Example 1, except that water was jetted at a water pressure of 20 MPa in the entanglement step 1. Table 1 shows the evaluation results.

<Example 3> Except that in the entanglement step 1, the major axis dimension is 50mm, the minor axis dimension is 10mm, and the spacing of 10mm is passed between the perforated rollers with oblong lattice-shaped openings (oblong shape), the fibers are produced in the same manner as in Example 1. Construct. Table 1 shows the evaluation results.

<Example 4> In the entanglement step 1, a fiber structure was produced in the same manner as in Example 1, except that the major axis dimension was 400 mm, the minor axis dimension was 5 mm, and the pitch was 15 mm. Table 1 shows the evaluation results.

＜Comparative example 1＞ A fiber structure was produced in the same manner as in Example 1 except that the entanglement step 1 was not performed. Table 1 shows the evaluation results.

＜Comparative example 2＞ In addition to not performing the entanglement step 1, instead the carding web is moved on the conveying net, with a diameter of 2mmφ and a pitch of 2mm, passing between the perforated cylinders with oblique lattice-shaped openings (circular shapes), and from the inside of the perforated cylinder , toward the web (web) and the conveying net, spray a spray-like water flow at 0.8 MPa, and implement the step of periodically forming the low-density region and high-density region of the fiber, and then transfer the carded web to a machine equipped with 76 In the belt conveyor of a resin endless belt with a mesh width of 500 mm, nozzles in a row are arranged at intervals of 0.6 mm in the width direction of the net using orifices with a diameter of 0.1 mm on one side, and water is sprayed at a water pressure of 4 MPa. 1 Similarly, fabricate a fiber structure. Table 1 shows the evaluation results.

Compared with Comparative Example 2, the fiber structure systems of Examples 1-3 have lower stress at 50% elongation, excellent initial compliance, and excellent 50% elongation recovery rate. Also, compared with Comparative Example 1, the fiber structure system of Examples 1-3 has a high stress at 80% elongation, and can be tightly wound. That is, compared with Comparative Examples 1 and 2, the fiber structure systems of Examples 1 to 3 have well-balanced properties required for both low elongation and high elongation.

1‧‧‧fibrous structure 2‧‧‧Entangling part (B) 3‧‧‧Entangling part (A) 4‧‧‧The distance between the entangled parts (B) 5‧‧‧Sample 6‧‧‧Single-sided adhesive tape 7‧‧‧Reel 8‧‧‧Alligator clip 9‧‧‧weight 10‧‧‧basis points 11‧‧‧The location half a circle from the base point 12‧‧‧Incision 13‧‧‧Jigs 14‧‧‧Chuck

FIG. 1 is a schematic diagram showing an arrangement pattern of entangled portions (B) in the flow direction of the fiber structure obtained in Example 1. FIG. Fig. 2 is a schematic diagram showing a method of preparing a sample for measuring sliding stress on a curved surface. Fig. 3 shows a schematic cross-sectional view of a sample used for measuring sliding stress on a curved surface. Fig. 4 is a schematic diagram showing a method for measuring sliding stress on a curved surface.

1: fiber structure

2: Entangling part (B)

3: Entangling part (A)

4: The distance between the intertwined parts (B)

Claims (8)

A fiber structure comprising a coiled crimped fiber (a) and a non-coiled crimped fiber (b), the fiber structure having an intertwined coil formed of the coiled crimped fiber (a) Part (A) and two or more entangled portions (B) composed of non-coiled crimped fibers (b), the distance between at least one entangled portion (B) in the flow direction of the fiber structure The ratio of the thickness (T A ) of the aforementioned entangled portion (A) to the thickness (T _B ) of the aforementioned entangled portion ( _B ) is T _A /T _B =1.1~10. The fiber structure according to claim 1, wherein in the surface of the fiber structure, the ratio of the area of the entangled portion (A) to the surface area of the fiber structure is 20 to 85%. The fiber structure according to claim 1, wherein in the flow direction of the fiber structure, the stress at 50% stretching is less than 15N/5cm, and the stress at 80% stretching is at least 20N/5cm. The fiber structure according to claim 1, wherein the ratio of the stress at 50% elongation to the stress at 80% elongation in the flow direction of the fiber structure is 2.7 or more. The fiber structure as claimed in claim 1, wherein the aforementioned coil-shaped crimped fiber (a) It is composed of composite fibers having a phase structure formed of plural resins having different thermal contraction rates or thermal expansion rates. For example, the fiber structure of Claim 1 has a weight per unit area of 50~200g/m ² . A bandage comprising the fiber structure according to claim 1. A method for manufacturing a fiber structure, which is a method for manufacturing a fiber structure according to any one of Claims 1 to 6, comprising: (1) a step of networking fibers, (2) spraying water or Spraying, a step of entanglement of a part of the web (web) to form the entangled part (B), and (3) a step of heating the web with high-temperature steam to form the entangled part (A).

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