JP2014037649A - Elastic self-adhesive nonwoven fabric excellent in dyeability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stretchable and self-adhesive nonwoven fabric excellent in stretchability and self-adhesiveness, safe and excellent in hand cutting properties, and excellent in design properties such as coloring by dyeing.
A cationic dye and / or a disperse dye is composed of a nonwoven fabric composed of at least two components including a cationic dyeable polyethylene terephthalate resin, 80% by mass or more of crimped fibers having an average radius of curvature of 50 to 200 μm. A stretchable self-adhesive nonwoven fabric having a dyeing rate at 90 ° C. of 80% or more and a dyeing rate at 95 ° C. of 85% or more.
[Selection figure] None

Description

  The present invention relates to a stretchable self-adhesive nonwoven fabric made of a nonwoven fabric. More specifically, the purpose of simple bundling, wrapping around a bent part that requires elasticity, simple packaging materials, etc., or as a simple fixing material in the cosmetics field or barbershop etc. It is used for support purposes in sports and animal medical fields, can apply moderate pressure to the application site, does not contain any substances of concern for skin irritation such as latex, and can be cut with scissors during use. The present invention relates to a stretchable self-adhesive non-woven fabric that has excellent hand-cutting properties that are not necessary and that has excellent design properties such as coloring by dyeing.

  Conventionally, various bandages and tapes have been used in the medical / sports field and the medical field for animals for the purpose of compression, fixation and protection. As functions required for these, in addition to stretchability or followability, sweat absorption, breathability, and the like, improvement in fixability by self-adhesion or adhesion can be mentioned. Of these functions, rubber-based or acrylic latexes are generally applied to the surface of the bandage for the purpose of satisfying stretchability and fixability (see, for example, Patent Documents 1 to 5). It also includes the possibility of stuffiness caused by blocking air permeability and causing allergies, which is not preferable from the viewpoint of safety.

Therefore, for the purpose of reducing skin irritation, a medical material using a low protein natural rubber latex as an adhesive (for example, see Patent Document 6), or a self-adhesive bandage using a specific acrylic polymer as an adhesive. (For example, refer to Patent Document 7) has been proposed, but those disclosed in these Patent Documents still use an adhesive, and the actual situation is not a fundamental solution.
That is, as described above, there has been no product satisfying necessary self-adhesiveness and appropriate stretchability without applying an adhesive. In addition, hand tearability during use is mostly due to tearing in the lateral direction, and no product has been developed that can be easily cut with one hand and the end can be easily fixed.

  In order to solve these problems, a stretchable and self-adhesive bandage excellent in stretchability and self-adhesiveness, and safe and excellent in hand tearability has been proposed (see, for example, Patent Document 8). Although design properties typified by color variations are required in applications, products having design properties have not yet been developed.

Japanese Patent Publication No. 48-000309 JP-A-63-068163 JP 63-260553 A Japanese Patent Laid-Open No. 01-190358 JP-A-11-089874 Special table 2003-514105 gazette JP 2005-095381 A Japanese Patent Laid-Open No. 2006-212828

  An object of the present invention is to provide a stretchable self-adhesive nonwoven fabric excellent in stretchability and self-adhesiveness, excellent in safety and hand cutting properties, and excellent in design properties such as coloring by dyeing, and tapes using the same. There is to do.

  As a result of intensive studies to solve the above problems, the present inventors have used a cationic dyeable polyethylene terephthalate resin, further heat-treated a fiber web containing a specific amount of specific latent crimped fibers by a specific method, Based on this “fastener effect”, a non-woven fabric in which the three-dimensional crimp of the latent-crimped fibers is expressed and the fibers are entangled to produce a so-called “fastener effect” due to an increase in the coefficient of friction between the nonwoven fabric surface fibers. The present inventors have found that a stretchable self-adhesive nonwoven fabric excellent in both self-adhesiveness, stretchability and hand cutting properties, and design properties such as coloring by dyeing can be obtained.

That is, the present invention comprises a nonwoven fabric comprising 80% by mass or more of crimped fibers composed of at least two components including a cationic dyeable polyethylene terephthalate resin and having an average radius of curvature of 50 to 200 μm, and is used as a cationic dye and / or a disperse dye. The dyeing rate at 90 ° C is 80% or more and the dyeing rate at 95 ° C is 85% or more, and preferably satisfies the following physical properties a) to d) in at least one direction of the nonwoven fabric. It is a stretchable self-adhesive nonwoven fabric characterized by
a) The breaking strength is 5 to 30 N / 50 mm,
b) The elongation at break is 50% or more,
c) 50% elongation recovery rate is 80% or more,
d) The curved surface slip stress is 0.5 N / 50 mm or more.

  Furthermore, the present invention provides a drum comprising a perforated plate and a fiber web comprising 80% by mass or more of crimped fibers having at least two components including a cationic dyeable polyethylene terephthalate resin and having an average curvature radius of 50 to 200 μm. The water which was run between the belts in contact with the belt and sprayed in a spray form at a pressure of 0.1 to 1.5 MPa was sprayed onto the web through the perforated plate, and then water vapor was sprayed onto the fiber web. A method for producing a stretchable self-adhesive nonwoven fabric characterized in that the crimps of latent crimped fibers are expressed and the fibers constituting the fiber web are entangled.

  According to the present invention, it is possible to obtain a stretchable self-adhesive nonwoven fabric excellent in design properties such as hand cutting properties, self-adhesive properties, and coloring properties by dyeing. In addition, since the stretchable self-adhesive nonwoven fabric of the present invention does not substantially contain an adhesive, it is safe when used in a bandage or the like, and also has excellent stretchability.

Hereinafter, the present invention will be described in detail.
The crimped fiber used in the present invention is a fiber in which crimps are expressed (exposed) by performing heat treatment on the latent crimped fiber described later, and refers to a fiber having a so-called coiled three-dimensional crimp.
The latent crimped fiber used in the present invention is a side-by-side type or eccentric structure composed of at least two components: a component A composed of a cationic dyeable polyethylene terephthalate resin and a component B composed mainly of a modified polyethylene terephthalate resin copolymerized with isophthalic acid. It is a core-sheath type composite fiber, and the number of crimps of the crimped fiber after the heat treatment is manifested is preferably 30 pieces / 25 mm or more, and the stretch rate of the crimped fiber is 50% or more. Preferably there is.

In particular, among the resins constituting the latent crimped fibers, a cation dyeable polyethylene terephthalate resin having an intrinsic viscosity of 0.55 to 0.70 is preferable for the component A.
The cationic dyeable polyethylene terephthalate resin used for the component A includes a metal salt (i) of sulfoisophthalic acid represented by the following chemical formula (I), cyclohexanedicarboxylic acid and / or an ester-forming derivative thereof (ii), fat It is preferred that the three components of the aliphatic dicarboxylic acid and its ester-forming derivative (iii) are copolymerized. Although the cause is not clear, the presence of the three kinds of copolymerization components can ensure excellent dyeing rate, wash fastness and light fastness under normal pressure.

  In the latently crimped fiber of the present invention, the cationic dyeable polyethylene terephthalate resin used for the component A is a metal salt of sulfoisophthalic acid represented by the following chemical formula (I) as a copolymerization component in order to obtain cationic dyeability ( It is preferable to use a copolymerized polyester containing i) as one of the copolymer components and further containing 1.0 mol% to 3.5 mol% of the metal salt (i) of sulfoisophthalic acid.

Examples of the metal salt (I) of sulfoisophthalic acid represented by the above formula (I) include 5-sodium sulfoisophthalic acid, or alkali metal sulfonates such as 5-potassium sulfoisophthalic acid and 5-lithium sulfoisophthalic acid. And dicarboxylic acid component having 5-tetraalkylphosphonium sulfoisophthalic acid such as 5-tetrabutylphosphonium sulfoisophthalic acid and 5-ethyltributylphosphonium sulfoisophthalic acid.
Only one type of the metal salt (i) of sulfoisophthalic acid represented by the above formula (I) may be copolymerized in the polyester, or two or more types may be copolymerized.
By copolymerizing the metal salt (i) of sulfoisophthalic acid represented by the above formula (I), the amorphous structure can be retained in the fiber internal structure as compared with the conventional polyester fiber, and as a result, the dispersion A polyester fiber which can be dyed at normal pressure with respect to dyes and cationic dyes and has excellent fastness can be obtained.

  When the copolymerization amount of the metal salt (i) of sulfoisophthalic acid represented by the above formula (I) is less than 1.0 mol%, a cationic dyeable dye which becomes clear and has a good color tone when dyed with a cationic dye. Can not be obtained. On the other hand, if the copolymerization amount of (i) exceeds 3.5 mol%, the viscosity of the polyester is remarkably increased and spinning becomes difficult. The amount becomes excessive and the clarity of the color tone is rather lost. From the viewpoint of the sharpness and spinnability of the dyed product, the copolymerization amount of (A) is preferably 1.2 to 3.0 mol%, more preferably 1.5 to 2.5 mol%. preferable.

  Further, in the component A, the dicarboxylic acid component other than the above (i) in the component A is 2.0 to 10.0 mol% of cyclohexanedicarboxylic acid and / or its ester-forming derivative (ii), preferably 5. 0 to 10.0 mol%, and aliphatic dicarboxylic acid and / or ester-forming derivative thereof is 2.0 to 8.0 mol%, preferably 3.0 to 6.0 mol%. preferable.

  When cyclohexanedicarboxylic acid or its ester-forming derivative (hereinafter sometimes referred to as cyclohexanedicarboxylic acid component) is copolymerized with polyethylene terephthalate, it has a characteristic that the disorder of the crystal structure is small. While ensuring, the fiber excellent also in light fastness can be obtained.

  By copolymerizing the cyclohexanedicarboxylic acid component, the crystal structure of the polyester fiber is disturbed, and the orientation of the amorphous part is lowered. Therefore, the penetration of the cationic dye and the disperse dye into the fiber is facilitated, and the atmospheric pressure dyeability of the cationic dye and the disperse dye can be improved. Furthermore, since the cyclohexane dicarboxylic acid component is less disturbed in crystal structure than other aliphatic dicarboxylic acids, it is excellent in light fastness.

  When the copolymerization amount of the cyclohexanedicarboxylic acid component in the dicarboxylic acid component is less than 2.0 mol%, the degree of orientation of the amorphous part inside the fiber becomes high, so that the dyeability in the normal pressure environment is insufficient and the target dyeing is insufficient. A dress rate cannot be obtained. If the dicarboxylic acid component exceeds 10.0 mol%, it is possible to secure good quality in terms of dyeability, such as dyeing rate, fastness to washing, and fastness to light, but the yarn is produced by a high-speed spinning method without stretching. The glass transition temperature of the resin is low and the degree of orientation of the amorphous part inside the fiber is low, so that stable fiber properties and stable high-speed spinnability can be achieved by spontaneous elongation during high-speed cutting. Can't get.

  The cyclohexanedicarboxylic acid used in the present invention includes three positional isomers of 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid. From the point obtained, any positional isomer may be copolymerized, or a plurality of positional isomers may be copolymerized. Further, although there are cis / trans isomers for each positional isomer, any stereoisomer may be copolymerized, or both cis / trans positional isomers may be copolymerized. The same applies to the cyclohexanedicarboxylic acid derivative.

  As for the fatty acid dicarboxylic acid and its ester-forming derivative component, similarly to the cyclohexyne dicarboxylic acid component, the crystal structure of the polyester fiber is disturbed and the orientation of the amorphous part is lowered. It becomes possible to improve the atmospheric pressure dyeability.

  When the copolymerization amount of the fatty acid component in the dicarboxylic acid component is less than 2.0 mol%, the dyeing property for the disperse dye under the normal pressure environment is insufficient, and the desired dyeing rate cannot be obtained. Moreover, when the copolymerization amount of the fatty acid component in the dicarboxylic acid component exceeds 8.0 mol%, the dyeing rate increases, but when the yarn is produced by a high-speed spinning method without stretching, the inside of the fiber is increased. The degree of orientation of the amorphous part becomes low, and stable high-speed spinnability cannot be obtained due to stable fiber properties and remarkable spontaneous elongation during high-speed winding.

  Preferred examples of the aliphatic dicarboxylic acid component of the present invention include aliphatic dicarboxylic acids such as adipic acid, sebacic acid and decanedicarboxylic acid. These can be used alone or in combination of two or more.

  Further, the cationic dyeable polyethylene terephthalate resin of the present invention includes a matting agent such as titanium oxide, barium sulfate and zinc sulfide, a heat stabilizer such as phosphoric acid and phosphorous acid, or a light stabilizer and an antioxidant. In addition, a surface treatment agent such as silicon oxide may be included as an additive. By using silicon oxide, the resulting fiber can impart fine irregularities to the fiber surface after weight reduction processing, and darkening is realized when it is later made into a woven or knitted fabric. Furthermore, thermal decomposition during heat melting or subsequent heat treatment can be suppressed by using a heat stabilizer. Moreover, the light resistance at the time of use of a fiber can be improved by using a light stabilizer, and it is also possible to improve dyeability by using a surface treating agent.

  On the other hand, for the component B, a modified polyethylene terephthalate resin in which 15 to 40 mol% of isophthalic acid and 0 to 10 mol% of diethylene glycol are copolymerized is used in order to efficiently develop crimp at a lower temperature. If this modification rate is low, sufficient crimps will not be exhibited, and the physical properties of 30 crimps / 25 mm or more after crimping and a stretch rate of 50% or more cannot be secured. And it will not be possible to achieve elasticity. Further, if the modification rate is higher than this, it is not preferable because the crimping performance can be sufficiently secured, but it becomes difficult to perform stable spinning.

  The latent crimped fiber used in the present invention is, for example, a conventionally known spinneret with a composite ratio (mass ratio) of the above-described A component and B component A component: B component = 40: 60 to 60:40, and a spinning temperature of 270. By melt spinning at ˜290 ° C., a side-by-side type or eccentric core-sheath type composite fiber can be obtained.

A preferable fineness of the latent crimped fiber used in the present invention is 0.5 to 20 dtex, more preferably 1 to 10 dtex, and further preferably 1.5 to 5 dtex.
If the fineness is thin, it is difficult to produce the fiber itself, it is difficult to secure the fiber strength, and it may be difficult to express a beautiful coiled crimp in the subsequent crimping process after forming into a nonwoven fabric. .
On the other hand, if the fineness is too thick, the polyethylene terephthalate component of the fiber becomes rigid and it is difficult to express sufficient crimps, which is not preferable.
Moreover, it is preferable that the fiber length of these fibers exists in the range of 10-100 mm. More preferably, it is 25-75 mm, More preferably, it is 30-60 mm. If the fiber length is short, it becomes difficult to form a fiber web in the subsequent process, and in the subsequent crimping process, the fibers are not entangled sufficiently, and as a result, sufficient strength and stretchability are ensured. It may not be possible. In addition, when the fiber length is long, not only is it difficult to form a fiber web with a uniform basis weight, but also a lot of entanglement of fibers occurs at the time of web formation, and as a result, when crimps are expressed. May interfere with each other and may not be able to exhibit sufficient elasticity.

  Next, the above-described latent crimped fibers are formed into a fiber web using a card method, an air array method, etc., and after the fibers are slightly entangled, a specific heat treatment is performed to obtain a desired stretchable self-adhesive nonwoven fabric. However, when manufacturing such a fiber web, you may mix another fiber as needed. In this case, the mixing ratio of the latent crimped fibers needs to be 80% by mass or more, preferably 90% by mass or more, and more preferably 95% by mass or more. When the ratio of the latently crimped fibers is less than 80% by mass, the crimped fibers expand and contract after the onset of crimping, and particularly when the contracted after stretching, the other fibers become resistance to the contraction, so that sufficient recovery is achieved. It becomes difficult to ensure the stress.

  Other fibers to be mixed with the web are not particularly limited as long as the desired performance can be ensured. For example, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, polyolefin fibers such as polypropylene and polyethylene, polyester Examples thereof include fibers and polyamide fibers.

  In order to obtain a stretchable self-adhesive nonwoven fabric having a well-balanced stretchability, hand cutting property and self-adhesiveness, which is the object of the present invention, the fibers constituting the web are generally parallel to the sheet surface. It is desirable to adjust so that it may be arranged. In addition, it is desirable that the nonwoven fabric obtained from the web is entangled with each other mainly due to a shape change due to the crimping of the latent crimped fibers without substantially fusing the constituent fibers. If there are many fibers oriented along the thickness direction (perpendicular to the sheet surface), the fibers also form coiled crimps, and the fibers are intertwined in an extremely complicated manner. . As a result, other fibers are fixed more than necessary, and further, the expansion and contraction of the coils constituting the fibers are inhibited, so that the stretchability of the nonwoven fabric is reduced. Therefore, it is desirable to arrange the fibers as parallel as possible to the sheet surface.

  Note that “arranged substantially parallel to the sheet surface” as used herein means that a portion where a large number of fibers are locally arranged along the thickness direction, such as entanglement by a needle punch, is repeated. Indicates a state that does not exist.

Next, the manufacturing method of the nonwoven fabric which comprises the expansion-contraction self-adhesive nonwoven fabric of this invention is demonstrated.
When the fiber web formed by the above-described method is sent to the next process by the belt conveyor and then passes between the drum made of the porous plate and the belt while being placed on the conveyor belt, the porous plate drum Water is sprayed out in a spray form so as to pass through the conveyor belt through the web from the inside, and this water moves the fibers constituting the web on the belt to a portion other than the holes of the perforated plate, collecting the fibers there To reduce the amount of fiber in the hole. In some cases, the fibers may be biased by forming holes in the web corresponding to the holes in the drum.

  It is preferable that the holes provided in the perforated plate drum have a hole diameter of 1.0 to 10.0 mm and a pitch of 1 to 5 mm. If the hole diameter is too small, the amount of water flowing cannot be earned, and the fibers of the fiber web may not be moved. On the other hand, if the hole diameter is too large, it is necessary to widen the pitch in order to ensure the form of the drum. As a result, a portion where the water does not come into contact with the web is formed, resulting in uneven quality or difficulty in uniform processing. End up.

  On the other hand, if the pitch of the holes is too small, the hole diameter must inevitably be reduced, so that it becomes difficult for water to pass through and the effect cannot be expected. On the other hand, if the pitch is too wide, a portion where water does not come into contact with the web is formed, resulting in uneven quality, which is not preferable.

This step does not mean that the strength of the web is ensured by tightly entanglement of the fibers with the water flow as in the case of a normal water-entangled nonwoven fabric, but the fiber web is in a wet state to the last. Furthermore, due to the uneven distribution of fibers generated in the web, some fibers are slightly entangled mainly at high fiber density parts, so that the fibers do not scatter due to the high-temperature and high-pressure steam used in the next process. It is. On the other hand, there is almost no fiber entanglement in the part where the fiber density is low, so there is almost no fiber entanglement, and the resistance due to contact between the fibers is very low, so that it becomes free, so that this ensures high fiber shrinkage It works effectively.
Therefore, the water ejection pressure at this time is desirably as low as possible so that the fiber entanglement is as light as possible, specifically 0.1 to 1.5 MPa, preferably 0.3 to 1.2 MPa. Most preferably, it is 0.6 to 1.0 MPa.

  The fiber web treated with water is further sent to the next process by a belt conveyor, and then exposed to a high-temperature and high-pressure steam stream to cause the crimped fibers to be crimped. This crimp expression causes the fiber to move while changing its shape like a coil, and the three-dimensional entanglement between the fibers appears. Usually, in the manufacturing process of a nonwoven fabric using latent crimped fibers, the process of fixing the fibers (entanglement process) and the heating process for expressing the latent crimps are separate, so the latent crimped fibers are mainly used. The resulting fiber web needs to exhibit crimp in the dry heat treatment process after securing the process passability to the next process and a stable form in the fiber entanglement process by the first needle punch or water entanglement. Become. For this reason, in such a manufacturing method, the inter-fiber knot strength after heat treatment becomes too large, the elongation stress in the length direction also becomes high, and it is difficult to easily cut by hand. In the present invention, the fiber web subjected to the minimum fiber entanglement is subjected to high-temperature and high-pressure steam treatment, and by applying heat, it is possible to simultaneously develop the crimping and entanglement of the fibers. It can be solved.

  Further, since the fiber web shrinks simultaneously with the steam treatment, it is desirable that the web is over-feeded immediately before being exposed to high-temperature and high-pressure steam. The belt conveyor used here is not particularly limited as long as it can basically transport the fiber web used for processing without disturbing its form, but an endless conveyor is preferably used. Of course, a general single belt conveyor may be used, or another belt conveyor may be prepared as necessary, and the fiber web may be sandwiched between the two conveyors. By doing in this way, when processing this web, it can control that the form of the conveyed web is changed by external force, such as water vapor or conveyor vibration.

  A water vapor jet device for supplying water vapor to the fiber web is mounted in one conveyor and supplies water to the web through a conveyor net. Further, in order to perform the steam treatment on the front and the back of the web at the same time, another steam spraying device may be installed in the conveyor on the downstream side. If the front and back of the nonwoven fabric are to be steam-treated when there is no downstream steam spraying device, the front and back of the nonwoven fabric once treated may be reversed and passed through the treatment device again.

  The endless belt used for the conveyor is not particularly limited as long as it does not hinder the conveyance of the web or the water vapor treatment, but a mesh coarser than 90 mesh is preferable. A finer mesh than this is not preferable because it has low air permeability and makes it difficult for water vapor to pass through. The belt material is preferably a mesh belt made of a heat-resistant resin such as metal, heat-treated polyester, polyphenylene sulfide, or polyarylate (fully aromatic polyester) from the viewpoint of heat resistance against water vapor treatment.

The nozzle for injecting the water vapor 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. At this time, one or more orifice rows may be provided, and a plurality of rows may be arranged in parallel. Of course, a plurality of nozzle dies having a single orifice array may be installed in parallel.
For example, when using a type of nozzle in which an orifice is formed in a plate, the thickness of the plate is mainly about 0.5 to 1.0 mm. In this case, the diameter and pitch of the orifice are not particularly limited as long as the desired crimp expression and the fiber entanglement accompanying this expression can be realized efficiently, but usually the diameter is 0.05 to 2 In many cases, a thickness of 0.0 mm is used, preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.5 mm. On the other hand, the pitch of the orifices is usually 0.5 to 3.0 mm in many cases, but is preferably 1.0 to 2.5 mm, more preferably 1.0 to 1.5 mm.

  When the diameter of the orifice is smaller than 0.05 mm, it is preferable because the processing accuracy of the nozzle is lowered and the processing is difficult, and the operational problem is that clogging is likely to occur. Absent. On the contrary, when it exceeds 2.0 mm, it is difficult to obtain a sufficient water vapor injection force, which is not preferable. On the other hand, when the pitch is less than 0.5 mm, the nozzle holes are too dense, which is not preferable because the strength of the nozzle itself is reduced. On the other hand, when the pitch exceeds 3.0 mm, there may be cases where water vapor does not sufficiently hit the fiber web, and it may be difficult to ensure sufficient strength.

Further, the water vapor used is not particularly limited as long as the desired fiber crimp expression and the appropriate fiber entanglement associated therewith can be realized, and may be set depending on the material and form of the fiber used. It is preferable to use water vapor of ˜2.0 MPa, more preferably 0.2 to 1.5 MPa, and still more preferably 0.3 to 1.0 MPa. For example, if the water vapor pressure is too high or too strong, the fibers forming the fiber web may move more than necessary at that momentum, resulting in turbulent formation, or the fibers may be entangled more than necessary. is there. In extreme cases, there is a possibility that the target stretchability cannot be ensured, for example, fibers are fused.
If the pressure is too weak, the amount of heat necessary to develop the crimp of the fiber cannot be given to the web being processed, or water vapor cannot penetrate the fiber web and the fiber is crimped in the thickness direction. Problems such as occurrence of expression spots may occur, and problems such as difficulty in controlling uniform ejection of water vapor from the nozzle may be likely to occur.

  Thus, after the crimp of the actual crimp fiber in a fiber web is expressed, since a water | moisture content may remain in a nonwoven fabric, you have to dry a nonwoven fabric as needed. With respect to drying, it is necessary that the fibers on the nonwoven fabric surface in contact with the heating element for drying do not adhere to the heat of drying to reduce the stretchability, and any method can be used as long as this can be achieved. Therefore, you may use a large drying facility such as a cylinder dryer or tenter that has been used for drying nonwoven fabrics in the past. When it is a level that can be dried by means, a non-contact method such as far-infrared irradiation, microwave irradiation, or electron beam irradiation, a method of blowing or passing hot air, and the like are preferable.

  The nonwoven fabric obtained in this way is wetted with water in the production process and exposed to a high-temperature, high-pressure steam atmosphere. In addition to being a more sanitary non-woven fabric in which deposits on fibers such as oil agents are washed, the non-woven fabric also exhibits water repellency.

The crimped fiber constituting the nonwoven fabric has a substantially coiled crimp after the expression of the crimp, and the average radius of curvature of the circle formed by the coil of the crimped fiber is 50 to 200 μm, It is preferable that it is 50-160 micrometers, More preferably, it is 70-130 micrometers.
Here, the average radius of curvature is an index representing the average size of a circle formed by the coil of the crimped fiber. When this value is large, the formed coil has a loose shape. In other words, it can be said that the shape has a small number of crimps. In addition, this also reduces the entanglement between the fibers, which is disadvantageous for exhibiting sufficient stretch performance. On the other hand, when a coiled crimp such that this value is smaller than 50 μm is developed, the fibers are not sufficiently entangled, making it difficult to secure the web strength. It is also very difficult to produce latently crimped fibers that develop crimps.

  The nonwoven fabric used in the present invention preferably has a breaking elongation of 50% or more in at least one direction, more preferably 80% or more. Furthermore, the recovery rate after 50% elongation (50% elongation recovery rate) is preferably 80% or more, more preferably 90% or more, and still more preferably 95% or more. As a result, particularly when used as a bandage, it can sufficiently follow the shape of the place of use and can be appropriately fixed and tightened.

  In other words, if these values are small, the use location has a complicated shape, or if it moves during use, the nonwoven fabric cannot follow the movement properly, or the location is deformed by the movement of the body May not be able to achieve the original purpose of fixing the wound portion because it does not return.

  Furthermore, the non-woven fabric used in the present invention has a 25% elongation stress in the first 50% elongation behavior, that is, an elongation stress (X) in the 50% elongation recovery behavior in at least one direction, and 25 in the return behavior after 50% elongation. % Return stress at% elongation, that is, the ratio of recovery stress (Y) (Y / X) is preferably 0.1 or more, more preferably 0.3 or more, and further preferably 0.4 or more. And particularly preferably 0.5 to 1.0. Keeping this value higher means that the return stress after stretching the non-woven fabric can be kept high and can be more strongly fixed when wound. If this value is low, the return stress is low, the fixing force is weak, and the original function may not be achieved in applications such as bandages.

The stretchable self-adhesive nonwoven fabric of the present invention preferably has a breaking strength of 5 to 30 N / 50 mm in at least one direction, more preferably 6 to 25 N / 50 mm, and still more preferably 7 to 20 N / 50 mm. is there. This value is related to the ability to cut by hand when dressed, and when a break that triggers tearing is created during actual use, this value should not be easily avoided. In addition, it is necessary to maintain a “stickiness” against tearing. When tearing starts, this shifts to breakage, and it can be said that the final hand cut depends on the break strength. Therefore, if the breaking strength is too large, it becomes difficult to tear the nonwoven fabric with one hand during use. Moreover, when less than 5N / 50mm, the intensity | strength of a nonwoven fabric is insufficient and it will become a thing with low handleability, such as breaking easily. For example, usually in a method of using a tape-shaped band such as a bandage, the tape is wound around the affected area while extending along the length direction, the necessary amount is wound and then cut, and the cut end is stopped. Therefore, it is preferable to satisfy the above-described range of breaking strength in the length direction of the bandage.
Moreover, when manufacturing a bandage, it is necessary to process this nonwoven fabric according to the width | variety and length required for a bandage, but this process can be easily processed normally using a slitter rewinder.
In the present invention, it is preferable that the breaking strength in the above range is achieved in the length direction of the nonwoven fabric also from the viewpoint of ensuring good production processability.

  On the other hand, when it is used as a bandage, the nonwoven fabric is joined by being pushed while being stretched by the action of tearing the end after winding once, and expresses self-adhesiveness However, at this time, it is ideal that the nonwoven fabrics at the joint are joined at a strength equal to or higher than the breaking strength of the nonwoven fabric. However, in practice, the winding method is always changed according to the state of the part to be wound, and there is no practical problem even with a bonding strength below this, and actual measurement is difficult. Therefore, in the present invention, “curved surface slip stress” is used as a method for evaluating the self-adhesion. In order to have a predetermined self-adhesiveness when the nonwoven fabric is used as a bandage and can be used to the extent that there is no practical problem, the curved surface slip stress is preferably 0.5 N / 50 mm or more, and more preferably Is 1.0 N / 50 mm or more, more preferably 3.0 N / 50 mm or more. This value is a value largely related to the self-adhesiveness of the nonwoven fabric, and the larger the value, the more firmly the fixed end is fixed after the nonwoven fabric is wound around the target place and then torn. Therefore, when this value is less than 0.5 N / 50 mm, the end of the nonwoven fabric cannot be sufficiently fixed and is gradually unwound. In addition, the curved surface slip stress said to this invention is measured by the method mentioned later.

  Moreover, it is preferable that this nonwoven fabric has water repellency. This is to prevent the affected part from getting wet as it is when the part covering the affected part is covered with water when used as a bandage. The manifestation of water repellency is due to the fact that the constituent fibers are exposed to water and water vapor in the manufacturing process already described, so that fiber deposits such as fiber oils are mainly washed away, and the inherent properties of the constituent resin on the surface of the constituent fibers. Is due to the expression. Specifically, this water repellency is preferably 3 or more in the JIS L1092 spray test.

Basis weight of the nonwoven fabric used for the stretchable self-adhesive nonwoven fabric of the present invention is preferably from 10 to 250 g / ^{m 2,} more preferably from 20~180g / ^{m 2.} If the basis weight is less than 10 g / m ² , sufficient physical properties cannot be obtained, while if it exceeds 250 g / m ² , uniform crimp expression may not be obtained.

Furthermore, the nonwoven fabric used for the stretchable self-adhesive nonwoven fabric of the present invention has a dyeing rate of 90% or higher at 90 ° C and 85% or higher at 95 ° C when dyed with a cationic dye and / or a disperse dye. Furthermore, it is preferable that the dyeing rate at 90 ° C. is 85% to 100% and the dyeing rate at 95 ° C. is 90% to 100%.
When the dyeing rate at 90 ° C. is less than 80% or the dyeing rate at 95 ° C. is less than 85%, a stretchable self-adhesive nonwoven fabric excellent in design properties such as color developability, which is the object of the present invention, cannot be obtained.

  Moreover, it is desirable that the nonwoven fabric used in the present invention does not substantially contain an adhesive such as a natural rubber or synthetic rubber component for expressing stretchability or a latex for developing self-adhesiveness. Since the nonwoven fabric exhibits good stretchability and self-adhesiveness without using a rubber component or a pressure-sensitive adhesive, it is also a great feature that it does not contain these and is safe with little skin irritation when used as a bandage. one of.

  The nonwoven fabric produced in this manner is cut into a predetermined width and length to obtain the stretchable self-adhesive tape-shaped nonwoven fabric of the present invention, which is particularly suitable for bandage applications as described above. In addition to this, the non-woven fabric can be applied to applications such as a base fabric for poultice, sanitary materials, or human skin. It can also be used for simple bundling purposes, wrapping around bent parts that require elasticity, and simple packaging materials. It can also be used as a simple fixing material in the cosmetics field and barber / beauty scenes. Since it can be easily colored during these uses, it can be used for purposes such as being able to be color-coded according to the site of use or purpose of use, or as a design-imparting material.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, each physical-property value in an Example was measured with the following method.

(1) Intrinsic viscosity of cationic dyeable polyethylene terephthalate resin Using a viscometer for a solution in which a corresponding cationic dyeable polyethylene terephthalate sample was dissolved at a concentration of 1 g / 0.1 L using a mixed solvent of equal mass of phenol and tetrachloroethane. The solvent and solution flow time at 30 ° C. was measured, and the intrinsic viscosity [η] was calculated.

(2) Number of crimps Evaluation was made according to JIS L1015 “Testing method for chemical fiber staples” (8.12.1).

(3) Average curvature radius Using a scanning electron microscope (SEM), a photograph in which the cross section of the nonwoven fabric was magnified 100 times was taken. Obtain the radius of the circle when drawing a circle along the spiral of the fiber in the cross-sectional photograph taken of the nonwoven fabric, and the fiber forms one or more spirals (coils). Is the radius of curvature. In addition, when the fiber was drawing the spiral in the ellipse shape, the ellipse was fitted and 1/2 of the sum of this major axis and minor axis was made into the curvature radius. However, the ratio of the major axis to the minor axis of the ellipse to be applied to the fiber spiral is excluded in order to eliminate the case where the crimped fiber does not exhibit sufficient coil crimp or the case where the spiral shape of the fiber is observed obliquely. Only those in the range of 0.8 to 1.2 were measured.
The measurement was performed on an SEM image taken for an arbitrary cross section, and measurement was performed with n number = 100, and the average value was used.

(4) Weight per unit area Measured according to JIS L1913 “General Short Fiber Nonwoven Fabric Test Method”.

(5) Thickness and density Thickness was measured according to JIS L1913 "General short fiber nonwoven fabric test method", and the density was calculated from this value and the basis weight measured by the method of (4).

(6) Breaking strength and breaking elongation Measured according to JIS L1913 “Testing method for general short fiber nonwoven fabric”. The breaking strength and breaking elongation were measured in the flow (MD) direction and width (CD) direction of the nonwoven fabric.

(7) Water repellency evaluated according to JIS L1092 “Test method for waterproofness of textile products” (6.2 spray test).

(8) Curved surface sliding stress It measured by the method shown below.
First, a nonwoven fabric to be measured was cut into a size of 50 mm width × 600 mm length to prepare a sample. Next, as shown in FIG. 1 (1), after fixing one end of the sample 1 to the core 3 (polypropylene resin pipe roll having an outer diameter of 30 mm × length of 150 mm) with a cellophane tape 2, Use the alligator clip 4 at the other end (grip width 50 mm, 0.5 mm thick rubber sheet fixed inside the mouth part with double-sided tape for use) 150 g so that the entire sample width is uniformly loaded The weight 5 was attached.
The pipe roll with the sample fixed is lifted so that the sample and the weight are suspended, and the sample roll is wound around the pipe roll and the pipe roll is rolled up five times so that the weight is lifted so that the weight is lifted (FIG. 1). (See (2)). In this state, the contact point between the pipe roll around which the sample is wound and the outermost peripheral portion on the weight side of the sample (boundary line between the sample portion wound around the pipe roll and the sample portion toward the weight side) is set as a base point 6. The crocodile clip and the weight were slowly removed so that this base point did not change. Next, at the point 7 where the pipe roll was half-turned (180 °) from this base point, the outermost peripheral part of the sample was cut with a razor blade so as not to damage the inner layer sample, and a cut 8 was provided (see FIG. 2).
Curved surface slip stress between the sample portion of the outermost layer and the sample portion wound around the pipe roll below (inner layer) was measured. A tensile tester (manufactured by Shimadzu Corporation, “Autograph”) was used for this measurement. The pipe roll is fixed to the jig 9 installed on the fixed chuck base of the tensile tester (see FIG. 3), and the end of the sample on which the weight is attached is grasped by the chuck 10 on the load cell side, and the tensile speed is 200 mm / min. The measured value (tensile strength) when the samples were pulled apart from each other was defined as the curved slip stress. In addition, when the curved surface sliding stress was too strong to exceed the breaking strength and it broke before the sample was removed, it was described as “breaking”.

(9) 50% elongation recovery rate Measured according to JIS L1096 “General Textile Test Method”. However, the evaluation in the present invention was made uniformly with a recovery rate at an elongation of 50%, and after extending 50%, after returning to the original position, the next operation was started without waiting time. In addition, the measurement was performed about the flow (MD) direction and the width (CD) direction of the nonwoven fabric.

(10) Elongation stress and recovery stress In the initial elongation process in the elongation recovery rate measurement of (9) above, the elongation stress when elongated by 25% is defined as elongation stress (X), and 25% in the return process after 50% elongation. The return stress when returning to the elongation was taken as the recovery stress (Y). Y / X was calculated from the measurement results. In addition, the measurement was performed about the flow (MD) direction and the width (CD) direction of the nonwoven fabric.
(11) Dyeing Method After scouring the obtained fiber knitted fabric, it was colored with a cationic dye or a disperse dye under the following conditions.
(Cationic dye)
Dye: Cathylon Red CD-FGLH 3.0% omf
Auxiliary agent: Na ₂ SO ₄ 10.0%, CH ₃ COONa 0.5%, CH ₃ COOH (50%)
Bath ratio 1:50
Dyeing temperature x time: 90 ° C x 40 minutes (disperse dye)
Dye: Dianix Navylue SPH conc5.0% omf
Auxiliary agent: Disper TL: 1.0 cc / l, ULTRA MT-N2: 1.0cc / l
Bath ratio 1/50
Dyeing temperature x time: 95-100 ° C x 40 minutes (reduction washing)
Sodium hydroxide: 1.0 g / L
Hydrosulfide sodium: 1.0 g / L
(12) Dyeing rate The stock solution before dyeing and the remaining solution after dyeing were each diluted with acetone water (acetone / water = 1/1 mixed solution) at any same magnification, and after measuring the respective absorbance, The dyeing rate was determined from the equation shown.
Absorbance meter: spectrophotometer HITACHI
HITACHI Model 100-40
Spectrophotometer
Dyeing rate = (A−B) / A × 100 (%)
Here, A and B respectively indicate the following.
A: Absorbance of stock solution (acetone water diluted solution) B: Absorbance of dyeing residual solution (acetone water diluted solution)

(13) Dyeing density (K / S)
The dyeing density was determined from the Kubelka-Munk equation shown below by measuring the reflectance R at the maximum absorption wavelength of the sample knitted fabric after dyeing.
Spectral reflectometer: spectrophotometer HITACHI
C-2000S Color Analyzer
K / S = (1-R) ² / 2R

[Example 1]
Of the dicarboxylic acid component, 88.3 mol% is terephthalic acid (TA), 5-sodium sulfoisophthalic acid is 1.7 mol%, 1,4-cyclohexanedicarboxylic acid (CHDA) is 5.0 mol%, adipine Resin (component A) made by transesterification and polycondensation reaction of all carboxylic acid components containing 5.0 mol% of acid, ethylene glycol, and predetermined additives, and 20 mol of isophthalic acid % And diethylene glycol 5 mol% copolymerized modified polyethylene terephthalate resin (component B) side-by-side type composite staple fiber (1.7 dtex × 51 mm length, mechanical crimp number 12/25 mm, after 130 ° C. × 1 minute heat treatment The number of crimps of 62/25 mm) was prepared. A card web having a basis weight of 32.2 g / m ^{2 was} obtained by the card method using 100% by mass of the side-by-side type composite staple fiber.

The card web is moved on the conveyor net, passed between the perforated plate drums having holes of 2 mmφ and 2 mm in a staggered manner, and 0.8 MPa from the inside of the perforated plate drum toward the web and the conveyor net. The water flow was ejected in the form of a spray so that the fibers did not substantially entangle, and were wet enough to move the fibers slightly.
The card web was transferred to a belt conveyor equipped with a 30 mesh, 500 mm wide resin endless belt.
At this time, the web was overfeeded to about 200% so as not to inhibit the shrinkage in the next water vapor treatment step. In addition, the same belt was equipped in the upper part of the belt of this belt conveyor, each rotated in the same direction at the same speed, and the belt conveyor which can adjust the space | interval of these both belts arbitrarily was used.
Next, the card web is introduced into a water vapor jetting device provided in the belt conveyor, 0.4 MPa of water vapor is jetted perpendicularly to the card web from the device to perform water vapor treatment, and the coiled wrinkles of the latent crimped fibers are obtained. A nonwoven fabric was obtained by causing shrinkage and entanglement of fibers. In the water vapor jetting apparatus, a nozzle is installed in one conveyor so as to spray water vapor toward the web through a conveyor belt, and a suction apparatus is installed in the other conveyor. However, this suction was not activated. In addition, the hole diameter of the water-vapor spray nozzle is 0.3 mm, and the nozzles are arranged in a line at a pitch of 2 mm along the conveyor width direction. The processing speed was 10 m / min, and the distance between the nozzle and the conveyor belt on the suction side was 10 mm.

The obtained nonwoven fabric had a basis weight of 75.6 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after it was lightly stretched by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. The bandage was wound around the finger for about three turns and then strongly stretched. As a result, the bandage was easily broken, and the broken portion was strongly fixed on the nonwoven fabric wound around the finger.

[Examples 2 to 8]
Other than changing the copolymerization component and copolymerization amount of the compound represented by the above chemical formula (I) of the polyester resin, 1,4-cyclohexanedicarboxylic acid, aliphatic dicarboxylic acid and isophthalic acid (IPA) as shown in Table 1. Produced a copolymer in the same manner as in Example 1. Further, this polymer was processed in the same manner as in Example 1 to obtain a nonwoven fabric. The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 1. The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Example 9]
95% by mass of the side-by-side type composite staple fiber used in Example 1 and 5% by mass of polyethylene terephthalate fiber (1.6 dtex × 51 mm length, 15 mechanical crimps / 25 mm) are mixed, and the basis weight is obtained by the card method. The card web was 3 g / m ² . When this web was transferred to a belt conveyor, a nonwoven fabric was obtained by processing in the same manner as in Example 1 except that the web was overfeeded to about 120%.
The resulting non-woven fabric has a basis weight of 62.7 g / m ² due to shrinkage, stretches well in the MD and CD directions, stretches by hand to such an extent that it does not break, and immediately returns to its original shape when the stress is released. Returned to. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Example 10]
Of the dicarboxylic acid component, 88.3 mol% is terephthalic acid (TA), 5-sodium sulfoisophthalic acid is 1.7 mol%, 1,4-cyclohexanedicarboxylic acid (CHDA) is 5.0 mol%, adipine Resin (component A) prepared by transesterification and polycondensation reaction with total carboxylic acid component containing 5.0 mol% of acid, ethylene glycol, and predetermined additives, and 30 mol of isophthalic acid % And a modified polyethylene terephthalate resin (component B) copolymerized with 7 mol% of diethylene glycol (side-by-side type composite staple fiber (1.7 dtex × 51 mm length, mechanical crimp 12 pieces / inch, after heat treatment at 130 ° C. for 1 minute) crimp number using 74 pieces / 25 mm) 100 mass% of, mosquito example 1 in the same manner as basis weight 38.3 g / ^{m 2} To prepare a Dowebu. A nonwoven fabric was obtained by processing this web in the same manner as in Example 1.
The obtained nonwoven fabric had a basis weight of 108.0 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. When this bandage was wound around the finger for about 3 turns and strongly stretched, it was high in strength because of its high weight per unit area. However, it immediately broke and the broken part was fixed on the nonwoven fabric wound around the finger.

[Example 11]
Of the dicarboxylic acid component, 88.3 mol% is terephthalic acid (TA), 5-sodium sulfoisophthalic acid is 1.7 mol%, 1,4-cyclohexanedicarboxylic acid (CHDA) is 5.0 mol%, adipine A resin (component A) prepared by transesterification and polycondensation reaction of all carboxylic acid components each containing 5.0 mol% of acid, ethylene glycol, and a predetermined additive; and isophthalic acid Side-by-side type composite staple fiber composed of 15 mol% copolymerized modified polyethylene terephthalate resin (component B) (1.7 dtex × 51 mm length, 12 mechanical crimps / inch, crimp after heat treatment at 130 ° C. for 1 minute) A card web having a weight per unit area of 33.4 g / m ² was produced in the same manner as in Example 1 by using 100% by mass of several 48 pieces / 25 mm. A nonwoven fabric was obtained by processing this web in the same manner as in Example 1. The obtained nonwoven fabric had a basis weight of 58.1 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Example 12]
A nonwoven fabric was obtained in the same manner as in Example 1 except that 100% by mass of the side-by-side type composite staple fiber used in Example 1 was used to obtain a card web having a basis weight of 18.3 g / m ² by the card method. The obtained nonwoven fabric had a basis weight of 40.2 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Example 13]
A nonwoven fabric was obtained in the same manner as in Example 1 except that 100% by mass of the side-by-side type composite staple fiber used in Example 1 was used to form a card web having a basis weight of 76.8 g / m ² by the card method.
The obtained nonwoven fabric had a basis weight of 150.3 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Example 14]
A nonwoven fabric was obtained in the same manner as in Example 1 except that the water vapor injection pressure was 1.2 MPa. The obtained nonwoven fabric had a basis weight of 79.3 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 2.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Comparative Example 1]
A side-by-side type composite comprising a polyethylene terephthalate resin (component A) having an intrinsic viscosity of 0.65 and a modified polyethylene terephthalate resin (component B) copolymerized with 20 mol% isophthalic acid and 5 mol% diethylene glycol as latent crimpable fibers. Staple fibers (1.7 dtex × 51 mm length, mechanical crimp number 12/25 mm, 130 ° C. × 62 minutes after heat treatment for 62 minutes / 25 mm) were prepared. A card web having a basis weight of 32.2 g / m ^{2 was} obtained by the card method using 100% by mass of the side-by-side type composite staple fiber.

The card web is moved on the conveyor net, passed between the perforated plate drums having holes of 2 mmφ and 2 mm in a staggered manner, and 0.8 MPa from the inside of the perforated plate drum toward the web and the conveyor net. The water flow was ejected in the form of a spray so that the fibers did not substantially entangle, and were wet enough to move the fibers slightly.
The card web was transferred to a belt conveyor equipped with a 30 mesh, 500 mm wide resin endless belt.
At this time, the web was overfeeded to about 200% so as not to inhibit the shrinkage in the next water vapor treatment step. In addition, the same belt was equipped in the upper part of the belt of this belt conveyor, each rotated in the same direction at the same speed, and the belt conveyor which can adjust the space | interval of these both belts arbitrarily was used.
Next, the card web is introduced into a water vapor jetting device provided in the belt conveyor, 0.4 MPa of water vapor is jetted perpendicularly to the card web from the device to perform water vapor treatment, and the coiled wrinkles of the latent crimped fibers are obtained. A nonwoven fabric was obtained by causing shrinkage and entanglement of fibers. In the water vapor jetting apparatus, a nozzle is installed in one conveyor so as to spray water vapor toward the web through a conveyor belt, and a suction apparatus is installed in the other conveyor. However, this suction was not activated. In addition, the hole diameter of the water-vapor spray nozzle is 0.3 mm, and the nozzles are arranged in a line at a pitch of 2 mm along the conveyor width direction. The processing speed was 10 m / min, and the distance between the nozzle and the conveyor belt on the suction side was 10 mm.

The obtained nonwoven fabric had a basis weight of 75.6 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after it was lightly stretched by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. The bandage was wound around the finger for about three turns and then strongly stretched. As a result, the bandage was easily broken, and the broken portion was strongly fixed on the nonwoven fabric wound around the finger.

[Comparative Example 2]
95% by mass of the side-by-side type composite staple fiber used in Comparative Example 1 and 5% by mass of polyethylene terephthalate fiber (1.6 dtex × 51 mm length, 15 mechanical crimps / 25 mm) are mixed, and the basis weight is obtained by the card method. The card web was 3 g / m ² . When this web was transferred to a belt conveyor, a nonwoven fabric was obtained by processing in the same manner as in Example 1 except that the web was overfeeded to about 120%.
The resulting non-woven fabric has a basis weight of 62.7 g / m ² due to shrinkage, stretches well in the MD and CD directions, stretches by hand to such an extent that it does not break, and immediately returns to its original shape when the stress is released. Returned to. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Comparative Example 3]
A side-by-side type composite comprising a polyethylene terephthalate resin (component A) having an intrinsic viscosity of 0.65 and a modified polyethylene terephthalate resin (component B) copolymerized with 30 mol% isophthalic acid and 7 mol% diethylene glycol as latent crimpable fibers. Using staple fiber (1.7 dtex × 51 mm length, 12 crimps / inch of mechanical crimps, 130 ° C. × 74 crimps after 1 minute heat treatment / 100 mm) of 100% by mass, the basis weight is 38 as in Example 1. A card web of 3 g / m ² was produced. A nonwoven fabric was obtained by processing this web in the same manner as in Example 1.
The obtained nonwoven fabric had a basis weight of 108.0 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. When this bandage was wound around the finger for about 3 turns and strongly stretched, it was high in strength because of its high weight per unit area. However, it immediately broke and the broken part was fixed on the nonwoven fabric wound around the finger.

[Comparative Example 4]
Side-by-side type composite staple fiber (1) comprising a polyethylene terephthalate resin (component A) having an intrinsic viscosity of 0.65 and a modified polyethylene terephthalate resin (component B) copolymerized with 15 mol% of isophthalic acid as latent crimpable fibers. .7 dtex × 51 mm length, mechanical crimp number 12 / inch, 130 ° C. × 48 crimp number after heat treatment for 1 minute / 100 mm) was used in an amount of 100% by mass, and the mass per unit area was 33.4 g / m ^{2 in the same} manner as in Example 1. A card web was prepared. A nonwoven fabric was obtained by processing this web in the same manner as in Example 1.
The obtained nonwoven fabric had a basis weight of 58.1 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Comparative Example 5]
A nonwoven fabric was obtained in the same manner as in Example 1 except that 100% by mass of the side-by-side type composite staple fiber used in Comparative Example 1 was used to form a card web having a basis weight of 18.3 g / m ² by the card method. The obtained nonwoven fabric had a basis weight of 40.2 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Comparative Example 6]
A nonwoven fabric was obtained in the same manner as in Example 1 except that 100% by mass of the side-by-side type composite staple fiber used in Comparative Example 1 was used to obtain a card web having a basis weight of 76.8 g / m ² by the card method.
The obtained nonwoven fabric had a basis weight of 150.3 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

[Comparative Example 7]
A nonwoven fabric was obtained in the same manner as in Comparative Example 1 except that the water vapor injection pressure was 1.2 MPa. The obtained nonwoven fabric had a basis weight of 79.3 g / m ² . The nonwoven fabric stretched and contracted well in both the MD direction and the CD direction, and after stretching by hand to such an extent that it did not break, it immediately returned to its original shape when the stress was released. The results are shown in Table 3.
The nonwoven fabric was slit in the length direction with a width of 5 cm and rolled up to obtain a stretchable self-adhesive bandage of the present invention. As a result of winding this bandage around the finger for about 3 turns and stretching it strongly, the bandage broke and the broken portion was fixed on the nonwoven fabric wound around the finger.

  From the above results, the stretchable self-adhesive nonwoven fabric of the present invention is excellent in easy dyeability, stretchability and hand cutting properties, and when used as a bandage, has the same self-adhesiveness as a bandage using a conventional adhesive. You can see that

The schematic diagram which shows the sample preparation method of the curved surface slip stress measurement in this invention Cross-sectional schematic diagram showing a sample of curved surface slip stress measurement in the present invention The schematic diagram which shows the measuring method of the curved surface slip stress in this invention

1: Sample 2: Cellophane tape 3: Winding core (pipe roll)
4: Clip 5: Weight 6: Base point 7: A point half-circulating the pipe roll from the base point 8: Cut 9: Jig 10: Chuck

Claims (7)

  Consists of at least two components containing a cationic dyeable polyethylene terephthalate resin, comprising a non-woven fabric containing 80% by mass or more of crimped fibers having an average radius of curvature of 50 to 200 μm, and dyed with a cationic dye and / or a disperse dye A stretchable self-adhesive nonwoven fabric characterized by having a dyeing rate at 90 ° C. of 80% or more and a dyeing rate at 95 ° C. of 85% or more. The stretchable self-adhesive nonwoven fabric according to claim 1, which satisfies the following physical properties a) to d) in at least one direction.
a) The breaking strength is 5 to 30 N / 50 mm,
b) The elongation at break is 50% or more,
c) 50% elongation recovery rate is 80% or more,
d) The curved surface slip stress is 0.5 N / 50 mm or more.   The stretchable self-adhesive nonwoven fabric according to claim 1 or 2, which does not substantially contain an adhesive.   In the 50% elongation recovery behavior in at least one direction of the nonwoven fabric, the ratio of the elongation stress (X) and the recovery stress (Y) at the time of 25% elongation, the value of Y / X is 0.1 or more. 3. The stretchable self-adhesive nonwoven fabric according to any one of 3 above.   The stretchable self-adhesive nonwoven fabric according to any one of claims 1 to 4, wherein the surface has a water repellency measured by a JIS L1092 spray test method of 3 or more.   A fiber web composed of at least two components including a cationic dyeable polyethylene terephthalate resin and containing 80% by mass or more of crimped fibers having an average radius of curvature of 50 to 200 μm, and a drum made of a perforated plate and a belt in contact with the drum The water is sprayed in the form of a spray at a pressure of 0.1 to 1.5 MPa, and is sprayed onto the web through the perforated plate, and then water vapor is sprayed onto the fiber web to form the latent crimped fiber. 6. The method for producing a stretchable self-adhesive nonwoven fabric according to any one of claims 1 to 5, wherein the fibers constituting the fiber web are entangled with each other.   A bandage using the stretchable self-adhesive nonwoven fabric according to any one of claims 1 to 5.

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