JP2019181807A - Composite laminate - Google Patents

Abstract

To provide a composite laminate capable of being stably manufactured even when an elastic fiber with fine fineness is used by using a specific elastic fiber while securing appearance aesthetic property and functionality at a gathering part.SOLUTION: There is provided a composite laminate having a plurality of elastic fibers arranged in parallel between 2 fabrics and a plurality of resins arranged in one direction crossing the elastic fiber and conjugating 2 each fabric and the elastic fiber, in which 2 each fabrics and the elastic fiber is apart between locations where neighboring resins in a longer direction of the elastic fiber and the elastic fiber, a ratio of fineness of the elastic fiber to fineness of the fiber constituting the fabrics is 0.5 to 300, and the elastic fiber is a multi filament with single fiber fineness of 8 dtex to 25 dtex.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a composite laminate, and more specifically, suitable for uses such as clothing that adheres to the skin, specifically underwear, sportswear, or hygiene materials such as children's and adult paper diapers, sanitary goods, and the like. It is a composite laminate with elasticity that can be used. It has a beautiful appearance with excellent uniformity of wrinkles in the gathered part, and exhibits excellent processability with few thread breakage of elastic fibers during production. It is related with the composite laminated body which can do.

  Conventionally, in applications that adhere to the skin such as sanitary materials such as disposable diapers, stretchable materials have been used in order to improve the feeling of wearing and the wearing stability. For example, in a paper diaper, a composite laminate in which elastic fibers are inserted between laminated nonwoven fabrics is used to improve the fit with the body such as underbody, abdomen, waist, etc., or to prevent urine leakage. Have been used.

  Such a composite laminate having elasticity is often manufactured by laminating a plurality of elastic fibers in a predetermined draft and laminating with a plurality of sheet-like fabrics such as a nonwoven fabric while maintaining the state. Many of the body forms have hot melt resin extending in the direction parallel to the elastic fibers in the sheet-like fabric such as non-woven fabric, and such a composite laminate is frequently used for paper diapers and is the mainstream gather member. (For example, Patent Document 1).

  Further, when forming the gather member, a plurality of elastic elastic members (elastic fibers) are arranged between sheet-like fabrics such as non-woven fabrics, and the heat-bonding fibers are extended in the direction intersecting the elastic elastic members, Gather member (for example, patent document 2) which fixed the elastic expansion-contraction member between the sheet-like fabrics by the heat-seal | fusing by the adhering fiber, or hot melt adhesive instead of the heat-sealable fiber is applied in a predetermined pattern in a predetermined range. Gather which is arranged in a striped pattern in a direction intersecting the elastic elastic member by a so-called application method called a design coat, and the elastic elastic member is intermittently fixed to the fabric in the longitudinal direction via the hot melt adhesive A member (for example, Patent Document 3) is known. Furthermore, regarding a design coat for forming a hot melt adhesive coating layer, a design coat coating system and a coating method using a design roller having an uneven plate are also known (for example, Patent Document 4).

  When manufacturing a composite laminate as described above, a sheet-like fabric such as a non-woven fabric and an elastic fiber (for example, polyurethane elastic yarn) disposed between the fabrics are joined via an adhesive resin such as a hot melt adhesive. In the past, elastic fibers with fine single yarn fineness were considered good for hot melt bonding (for example, Patent Document 5).

  However, if elastic fibers with fineness (for example, polyurethane elastic yarns) are used, the presence of elastic fibers in the gathered portion or the like is less noticeable, and it is easy to form highly uniform wrinkles, thereby improving the appearance aesthetics. However, in the case of elastic fibers with fine fineness, if the single yarn fineness is thin, single yarn breakage is likely to occur due to friction with the guide and the like during the manufacturing process and heat reception from the hot melt adhesive. There is a problem that it is difficult to manufacture.

Japanese Patent Laying-Open No. 2005-320636 JP2013-202056A JP 2017-185336 A JP 2014-076077 A JP 2004-52127 A

  Therefore, the object of the present invention is to use a fine elastic fiber by using a specific elastic fiber while ensuring appearance aesthetics and functionality in a gathered portion required for advanced paper diaper products and clothing. It is an object of the present invention to provide a composite laminate that can be stably manufactured.

  In order to solve the above problems, a composite laminate according to the present invention includes a plurality of elastic fibers arranged in parallel in one direction between two fabrics, and a plurality of fibers in one direction intersecting the elastic fibers. A composite laminate comprising the two fabrics arranged side by side and a resin for joining the elastic fibers, wherein the resin adjacent to each other in the longitudinal direction of the elastic fibers intersects the elastic fibers The two fabrics are separated from the elastic fibers, the ratio of the fineness of the elastic fibers to the fineness of the fibers constituting the fabric is 0.5 to 300, and the elastic fibers are single yarns A multifilament having a fineness of 8 dtex to 25 dtex is used.

  In such a composite laminate according to the present invention, the elastic fiber is a fabric on both sides through a resin that is accurately applied to a predetermined region of the composite laminate in a predetermined direction by a so-called design coat. A structure in which the elastic fibers are separated from each other between the portions where the resin and the elastic fiber are adjacently joined in the longitudinal direction of the elastic fiber and the adjacent resin and the elastic fiber intersect in the longitudinal direction of the elastic fiber. Is constructed with a high regularity and has a high degree of stretching function, and a composite laminate having a gather part having a good fit and a smooth, regular and uniform wrinkle at the time of wearing is realized. . And in order to improve the external appearance aesthetics of such a composite laminated body provided with such a gathered part, in particular, in order to obtain an external appearance in which the presence of elastic fibers is not conspicuous, in the present invention, elasticity with respect to the fineness of the fibers constituting the fabric is obtained. A configuration in which the ratio of the fineness of the fibers is 0.5 or more and 300 or less is adopted. Furthermore, in the present invention, a multifilament having a single yarn fineness of 8 dtex to 25 dtex is used as the elastic fiber. By using multifilaments having a single yarn fineness in such a specific range, the number of broken yarns of the elastic fiber is small during the production of the composite laminate, as will be apparent from the comparison between Examples and Comparative Examples described later. It becomes possible to exhibit excellent process passability, and it becomes possible to produce a stable composite laminate. In particular, as described above, when elastic fibers with fine fineness are used, if the single yarn fineness is too thin, single yarn breakage may occur due to friction with the guide or the like during the manufacturing process or heat reception from the hot melt adhesive. There is a problem that it is easy to manufacture a composite laminate in a stable manner, but the use of multifilaments with a single yarn fineness in a specific range as described above as an elastic fiber makes it suitable for elastic fibers with a fineness. However, excellent processability can be obtained, and a composite laminate can be produced stably.

  As described above, when an elastic fiber having a fineness is used, a problem due to the fineness of the single yarn is likely to occur, and the problem is solved by using a multifilament having a single yarn fineness within a specific range according to the present invention. Therefore, it can be said that the present invention is particularly effective when the elastic fiber is thin. That is, in the composite laminate according to the present invention, when the fineness of the elastic fiber is 350 dtex (decitex) or less, the effect of the present invention is more remarkably exhibited. Therefore, when it is desired to obtain a higher effect according to the present invention, the fineness of the elastic fiber is preferably 350 dtex or less.

Further, in the composite laminate according to the present invention, in order to further increase the commercial value of the composite laminate having a gathered portion, the elastic fiber in the composite laminate cannot be seen or the elastic fiber exists in the visual appearance. It is preferable to satisfy the requirement that the elastic fiber cannot be confirmed, or the elastic fiber is very difficult to see or its existence is very difficult to confirm. In order to satisfy such a requirement, the present invention employs a configuration in which the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the above-mentioned fabric is 0.5 or more and 300 or less, and the composite laminate is made of the elastic fiber. when the outer surface of the fabric from the outside of the composite laminate began to colorimetry by spectrophotometer in a direction intersecting with the elastic fibers in extended state extending direction to stretched to the maximum, L ^* value is a maximum value ^{L *} values at the point shown, ^{a *} value, ^{b *} value ^{(L * 1, a * 1} , b * 1) and ^{L * L} value at the point showing the minimum value ^* value, ^{a *} value, ^{b *} value ( L ^* 2, a ^* 2, b ^* 2) can be used to form a composite laminate having a color difference variation ΔE ^* v defined by the following formula of 1.0 or less.
^{ΔE * v = √ [(L} * 1-L * 2) 2 + (a * 1-a * 2) 2 + (b * 1-b * 2) 2]

This color difference variation ΔE ^* v is measured with a spectrocolorimeter in the direction in which the outer surface of the fabric intersects the elastic fiber from the outside of the composite laminate with the composite laminate stretched to the maximum in the extending direction of the elastic fiber. This is expressed by the above equation and indicates the degree of variation in color difference in the colorimetric direction. When the fabric and elastic fiber are of the same color system, the color difference variation ΔE ^* v is particularly affected by the degree of change in the L ^* value indicating the brightness, thereby confirming whether the elastic fiber is easily visible and visible. Ease and difficulty are affected. As the color difference variation ΔE ^* v is larger, the change in the color difference at the intersection with the elastic fiber is larger. Therefore, it is easier to see the elastic fiber and to confirm the presence of the elastic fiber in appearance. When the color difference variation ΔE ^* v is 1.0 or less, the elastic fiber cannot be seen or the presence of the elastic fiber cannot be confirmed, or the elastic fiber is very difficult to see or its existence is very difficult to confirm. The required characteristics will be met. Therefore, it has a desired stretch function, excellent fit when worn, smooth texture, good regularity of wrinkles, and an aesthetic appearance with a homogeneous appearance that makes the presence of elastic fibers inconspicuous when viewed from the outside. An excellent composite laminate is realized.

  Moreover, in the composite laminated body which concerns on this invention, it is preferable that the coalescence index | exponent of an elastic fiber is less than 10. This coalescence index is represented by the number of thread cracks per predetermined length when the elastic fiber is run under a predetermined condition as defined later. The lower the coalescence index, the better the process passability. It becomes easy to stabilize the production of the composite laminate, and it is easy to obtain a stable and highly uniform wrinkle shape because the disorder of the shape of the elastic fiber to be fed is reduced.

  In the composite laminate according to the present invention, the thickness of the composite laminate at a location where the resin extending in one direction and the elastic fiber intersect is preferably 0.1 mm or more and 5.0 mm or less. More preferably, it is 1 mm or more and 2.0 mm or less.

  Further, in the composite laminate according to the present invention, the maximum value of the thickness of the composite laminate between the portions adjacent to the longitudinal direction of the elastic fiber and intersecting the resin extending in one direction and the elastic fiber is 1 mm or more and 20 mm. The following is preferable.

  Further, in the composite laminate according to the present invention, the width of one resin extending in one direction is 0.2 mm or more and 10 mm when the composite laminate is extended to the maximum in the extending direction of the elastic fiber. The following is preferable. Such a preferable resin width can be accurately adjusted by the design coat.

  In the composite laminate according to the present invention, the interval between the resins extending in one direction is preferably 1 mm or more and 20 mm or less in the state where the composite laminate is extended to the maximum in the extending direction of the elastic fiber. .

  Moreover, in the composite laminated body which concerns on this invention, it is preferable that the heat softening point of an elastic fiber is 100 degreeC or more and 240 degrees C or less. As a result, the bonding with the design-coated resin can be easily performed.

  Furthermore, in the composite laminate according to the present invention, the resin extending in one direction arranged in a direction intersecting with the elastic fiber contains the same component as the constituent component of the fabric and / or elastic fiber. Is preferred. This facilitates the bonding with the design-coated resin.

  Thus, according to the composite laminate according to the present invention, it is possible to obtain a composite laminate having both appearance aesthetics and functionality in a gathered portion required for advanced paper diaper products and clothing, in particular, elastic. By using multifilaments with a single yarn fineness in a specific range as the fiber, excellent processability can be obtained even with elastic fibers with a fineness, and a composite laminate can be produced stably. become.

It is a schematic block diagram of the manufacturing apparatus of the composite laminated body which concerns on one embodiment of this invention. It is the external appearance photograph which image | photographed an example of the test piece of the composite laminated body which concerns on this invention from the substantially planar direction. It is the external appearance photograph which image | photographed the test piece of the composite laminated body of FIG. 2 from the substantially cross-sectional direction, A shows the thickness in the location where resin and elastic fiber which extend in one direction cross | intersect, and B extends in one direction The measurement location of the maximum value of the thickness between the locations where the resin and the elastic fiber intersect is shown. FIG. 3 is an external view photograph taken from a substantially planar direction showing a state in the middle of extension when the test piece of the composite laminate of FIG. 2 is manually extended in the extending direction of the elastic fiber. FIG. 5 is an appearance photograph taken from a substantially planar direction showing a state in which the test piece of the composite laminate of FIG. 4 is extended to the maximum in the same direction.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 shows a schematic configuration of a composite laminate manufacturing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a polyurethane elastic yarn 1 as an elastic fiber in the present invention. The polyurethane elastic yarn 1 as the elastic fiber constitutes a yarn feeding roller on the upstream side in the yarn feeding direction among at least two yarn feeding rollers shown in the drawing, and has a predetermined constant speed (circumferential speed) set in advance. The yarn is fed to the downstream side while being removed from the polyurethane elastic bobbin 2 as the elastic fiber bobbin by the constant speed roller 3 driven at a speed. In FIG. 1, for ease of explanation, the supply state of one polyurethane elastic yarn 1 is illustrated, but actually, a plurality of polyurethane elastic yarns 1 are arranged in parallel (for example, the paper surface of the figure). Are fed in one direction (in the direction of the arrow).

  The polyurethane elastic yarn 1 fed downstream by the constant speed roller 3 constitutes a yarn feeding roller on the downstream side in the yarn feeding direction among the above-mentioned at least two yarn feeding rollers, and the speed (circumferential speed) is arbitrarily set. The yarn is taken up by a controllable variable speed roller 4 and fed further downstream. The speed control of the variable speed roller 4 controls the draft (yarn elongation ratio) applied to the polyurethane elastic yarn 1 between the two yarn feed rollers, that is, between the constant speed roller 3 and the variable speed roller 4. Further, the draft of the polyurethane elastic yarn 1 immediately before being inserted between the nip rollers 6 is controlled to the target draft by controlling the driving speed of a nip roller 6 described later disposed on the downstream side. In order to control or monitor the draft of the polyurethane elastic yarn 1 immediately before being inserted between the nip rollers 6 with the tension corresponding to the draft, the tension of the polyurethane elastic yarn 1 is arranged upstream of the nip roller 6 in the yarn feeding direction. The tension sensor 5 for detecting the tension is provided, and the tension of the polyurethane elastic yarn 1 is controlled so as to become the target tension. The tension of the polyurethane elastic yarn 1 at the stage where the warp is removed from the polyurethane elastic bobbin 2 by the constant speed roller 3 changes as the diameter of the polyurethane elastic bobbin 2 changes. Is absorbed once by the operation of pulling out and feeding the polyurethane elastic yarn 1 by the constant speed roller 3, and the tension (or draft) of the polyurethane elastic yarn 1 just before being inserted between the nip rollers 6 is variable from the constant speed roller 3. The tension is determined by a draft between the roller 4 and the nip roller 6, and the tension is controlled to a target tension which is not changed or extremely small even if there is a change by feedback of a detection signal from the tension sensor 5. It has become.

  The polyurethane elastic yarn 1 accurately controlled to the target tension (that is, stretched to a predetermined draft) is fed between the two upper and lower fabrics 8 drawn by the nip roller 6 from the upper and lower fabric rolls 7 in the drawing. Is done. At this time, for example, an adhesive resin such as a hot melt adhesive is intermittently applied in parallel to the nip inner surface side of one fabric by a coating roller 9 called a design roller, for example, and the adhesive resin is applied. The polyurethane elastic yarn 1 is intermittently joined to the two fabrics 8 at a predetermined interval, thereby forming a composite laminate 10 having stretchability. In this composite laminate 10, the polyurethane elastic yarn 1 is not joined with the adhesive resin and is separated from each fabric 8 in the section that is not joined with the adhesive resin, so that it can be stretched and bent in that section. As a result, the function as a gather member can be exhibited. Through such a series of steps, it is possible to maintain a regular (highly uniform) wrinkle in the gathered portion according to the present invention, and to provide a composite laminate excellent in appearance aesthetics. By using an elastic fiber (polyurethane elastic yarn 1) composed of multifilaments having a single yarn fineness of 8 dtex to 25 dtex, excellent processability can be obtained even when an elastic fiber having a fineness is used. Thus, the composite laminate 10 can be manufactured stably.

  Here, first, the form of the composite laminate obtained by the present invention will be described. FIG. 2 illustrates an appearance photograph taken from a substantially planar direction of a typical example of a composite laminate test piece manufactured according to the present invention. FIG. 3 shows an external appearance photograph of the test specimen of the composite laminate of FIG. 2 taken from a substantially cross-sectional direction, and A in the figure shows the thickness at the point where the resin extending in one direction and the elastic fiber intersect. , B indicates the measurement location of the maximum value of the thickness between the locations where the resin extending in one direction and the elastic fiber intersect. FIG. 4 illustrates an appearance photograph taken from a substantially planar direction, showing a state in the middle of extension when the test piece of the composite laminate of FIG. 2 is manually extended in the extending direction of the elastic fiber. FIG. 5 illustrates an appearance photograph taken from a substantially planar direction, showing a state in which the test piece of the composite laminate of FIG. 4 is extended to the maximum in the same direction.

  In the composite laminated body of this invention, it has the elastic fiber which consists of the polyurethane elastic yarn which was arrange | positioned in parallel in one direction between two fabrics, for example as mentioned above. The elastic fibers are arranged in a linear shape or a curved shape or a combination thereof, and are sandwiched between fabrics.

  In the composite laminated body of this invention, it has resin extended in one direction arranged in multiple numbers in the direction which cross | intersects an elastic fiber. That is, the resin is arranged in a direction that intersects the direction in which the elastic fiber is inserted. This resin is a resin for bonding two pieces of fabric to elastic fibers, and is a bonding resin that is accurately applied to a predetermined region in a predetermined direction by a so-called design coat. Alternatively, a bonding resin generated from the fabric itself or the elastic fiber itself (in particular, the fabric itself) by ultrasonic waves or heating may be used. The two fabrics and the elastic fiber are separated from each other between the portions where the adjacent resin and the elastic fiber intersect in the longitudinal direction of the elastic fiber. In the above, extending in one direction means that the resin is linear and is disposed in one direction as a whole. As the linear form, any of a linear form, a curved form, or a combination thereof can be adopted. Arranging in one direction as a whole means arranging such a linear form within a range of parallel lines within a width of 10 mm, and the direction in one direction is the direction of such virtual parallel lines. The direction. The angle at which the elastic fiber and the resin extending in one direction intersect is not particularly limited, but is preferably within a range of 90 ± 20 °, more preferably within a range of 90 ± 10 °, and more preferably 90 ± 5 °. If it is in the range, it is more preferable.

  In the composite laminate in the present invention, each fabric and the elastic fiber are separated from each other between the elastic fiber and the resin extending in one direction adjacent to each other in the longitudinal direction of the elastic fiber.

  The thickness between the resin and the elastic fiber extending in one direction is preferably 0.1 mm or more and 2.0 mm or less, and more preferably 0.2 mm or more and 2.0 mm or less. When smaller than 0.1 mm, the presence of elastic fibers in the composite laminate may be visually determined, and when the composite laminate is stretched, the presence of elastic fibers can be more significantly determined. The appearance and aesthetics of the composite laminate may be reduced. If it is larger than 2.0 mm, the formed heel may tend to bend, and the fit when worn and the feel of the heel with smooth and regularity may be unsatisfactory.

  And between the said places adjacent to the longitudinal direction of an elastic fiber, it is preferable that the maximum value of the thickness is 1 mm or more and 20 mm or less, More preferably, it is 2 mm or more and 10 mm or less. If it is smaller than 1 mm, the presence of elastic fibers in the stretched composite laminate may be clearly discernable visually, and if the composite laminate is stretched, the presence of elastic fibers can be discriminated more significantly. The appearance and aesthetics of the composite laminate may be deteriorated. If it is larger than 20 mm, the formed heel may tend to bend, and the fit when worn and the feel of the heel with smooth and regularity may be unsatisfactory.

  The width of the resin extending in one direction is preferably 0.2 mm or more and 10 mm or less at the maximum extension, and more preferably 0.4 mm or more and 6 mm or less. If it is smaller than 0.2 mm, the elastic fibers in the composite laminate are easy to move, and when the expansion and contraction are repeated, the uniformity of wrinkles is reduced, or adjacent elastic fibers are close to each other, and the presence can be visually determined. In some cases, the appearance and aesthetics of the composite laminate may be reduced. If it is larger than 10 mm, the presence of elastic fibers may be noticeable in a streak shape or stripe shape when the composite laminate is viewed with transmitted light. Further, the elongation of the composite laminate may be reduced, and the placement size may be increased, or the fit when worn and the smooth and regular feel of the heel may be unsatisfactory.

  And it is preferable that the space | interval of the resin extended to one direction is 1 mm or more and 20 mm or less at the time of the largest expansion | extension of a composite laminated body, More preferably, it is 2 mm or more and 15 mm or less. The interval between the resins extending in one direction refers to the distance between the centers of the resins extending in one direction. When such an interval is smaller than 1 mm, the case where the presence of elastic fibers in the composite laminate can be clearly discerned appears, and when the composite laminate is stretched, it is more prominent. Aesthetics may be reduced. If it is larger than 20 mm, the formed heel may be easily cramped, and the fit of the garment when worn and the feel of a smooth and well-ordered heel may be unsatisfactory.

The fabric used in the composite laminate of the present invention is preferably a woven fabric, a knitted fabric, a non-woven fabric, etc., and a particularly preferable fabric is a non-woven fabric, a wet non-woven fabric manufacturing method such as a papermaking method, a resin bond method, a thermal bond method, a needle punch method. , Any of those obtained by a dry nonwoven fabric manufacturing method such as a spunbond method, a spunlace method, a melt blow method and a flash spinning method, and may be a single layer or a plurality of laminates. Good. Moreover, 10-20 g / m < ² > or less of the fabric weight of a nonwoven fabric is preferable, More preferably, it is 12-18 g / m < ² >.

  The material of the fibers constituting the fabric is not particularly limited, but polyester, polyamide, polyacrylonitrile, polypropylene, polyethylene, copolymers of various α-olefins such as propylene and ethylene, synthetic fibers such as polyurethane, regenerated fibers such as rayon and acetate, Semi-synthetic fibers, natural fibers such as wool and cotton are preferred.

  The form of the fibers constituting the fabric may be either long fiber filaments or short fiber spun yarns. Two or more types of fibers may be mixed or mixed, crimped, or other composites Fibers can be selected widely.

The composite laminate in the present invention is one in which elastic fibers are used at least in part.
The elastic fiber used in the present invention is a polyurethane elastic fiber, a polyether ester elastic fiber, a polyamide elastic fiber, or a so-called rubber thread made of natural rubber, synthetic rubber or semi-synthetic rubber, and an elastomer. Those obtained by cutting the film into fibers, or fibers obtained by combining or mixing with other organic synthetic resin bodies mainly composed of these, crimped fibers, etc. can be adopted, and the fibers themselves have enthalpy elasticity. preferable. From the viewpoint of better exhibiting stretchability as a composite laminate, the most preferred is a polyurethane elastic fiber (typically, the polyurethane elastic yarn as described above).

  The elastic fiber used in the composite laminate of the present invention may be a bare yarn or may be covered (covered) with other elastic fibers or non-elastic fibers. From the viewpoint of stretchability, the bare laminate is most preferable as the composite laminate.

  The polyurethane elastic fiber is a long-chain diol such as a copolyester diol as a soft segment, a diisocyanate such as diphenylmethane-4,4′-diisocyanate (hereinafter abbreviated as MDI) as a hard segment, and a bifunctional as a chain extender. Polyester-based elastic fiber containing a functional hydrogen compound as a main component or polytetramethylene ether glycol as a soft segment, MDI as a hard segment, and a polyether-based elasticity containing a low molecular weight bifunctional hydrogen compound as a chain extender Fiber is preferred.

  In addition, the polyether / ester-based elastic fiber is preferably composed mainly of polytetramethylene ether glycol as a soft segment and polybutyl terephthalate or polybutyl isophthalate as a hard segment.

  In the present invention, from the viewpoint of imparting desired stretchability to the final product, it is preferable to use polyurethane elastic fibers as described above.

  The polyurethane polymer used in the polyurethane elastic fiber that can be used in the present invention is a soft segment, an isocyanate, and a chain extender, each having a long-chain polyether segment, a polyester segment, or a polyether ester segment as main components. It is preferable to be comprised from the hard segment which uses diamine or diol as a main structural component.

  The raw material constituting the soft segment of such a polyurethane polymer is 1) a polymer or copolymer obtained from tetrahydrofuran, tetramethylene glycol, 3-methyl-1,5-pentanediol, 3-methyltetrahydrofuran or the like. Ether segment 2) Polyester segment obtained from diols such as ethylene glycol, tetramethylene glycol, 2,2-dimethyl-1,3-propanediol and dibasic acids such as adipic acid and succinic acid 3) Poly- ( Polyether ester segments obtained from pentane-1,5-carbonate) diol, poly- (hexane-1,6-carbonate) diol, etc. can be used. Tramethylene ether glycol (hereinafter abbreviated as PTMG) is preferred.

  In the elastic fiber used in the composite laminate of the present invention, the polyurethane polymer is obtained by subjecting a prepolymer product obtained by polyaddition reaction of a hydroxyl-terminated soft segment precursor with an organic diisocyanate (capping reaction) to a diamine chain extender or diol. It can be obtained by chain extension with a chain extender. Furthermore, for the purpose of adjusting the thermal softening point, it is also preferable to obtain the prepolymer product by further reacting with an organic diisocyanate and then reacting with a chain extender.

  Examples of the organic diisocyanate to be used for the polyurethane polymer in the present invention include MDI, tolylene diisocyanate (TDI), bis- (4-isocyanatocyclohexyl) -methane (PICM), hexamethylene diisocyanate, 3,3,5-trimethyl-5. -Methylene cyclohexyl diisocyanate and the like can be used, and MDI is particularly preferable.

  Various diamines such as ethylenediamine, 1,3-cyclohexanediamine, 1,4-cyclohexanediamine and the like are preferably used as diamine chain extenders for forming polyurethaneurea.

  The diamine chain extender is not limited to only one type of diamine, and may be composed of a plurality of types of diamines. A chain terminator can be included in the reaction mixture to help control the final molecular weight of the polyurethaneurea. Usually, a monofunctional compound having active hydrogen as a chain terminator, such as diethylamine, can be used.

  Further, the chain extender is not limited to the diamine, and may be a diol. In particular, it is suitable for obtaining an elastic fiber having a heat softening point of 100 ° C to 180 ° C. For example, ethylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,2-propylene glycol, 1,4-cyclohexanedimethanol, 1,4-cyclohexanediol, 1,4-bis (Β-hydroxyethoxy) benzene, bis (β-hydroxyethyl) terephthalate, paraxylylene diol, and the like can be used. The diol chain extender is not limited to only one type of diol, and may be composed of a plurality of types of diols. Moreover, you may use together with the compound containing one hydroxyl group which reacts with an isocyanate group. In this case, various methods such as a melt polymerization method and a solution polymerization method can be adopted as a method for obtaining such a polyurethane, and the method is not limited. The polymerization formulation is not particularly limited, and for example, a method of synthesizing polyurethane by simultaneously reacting a polyol, a diisocyanate, and a chain extender composed of a diol can be employed. It may be a thing.

  Furthermore, it is also preferable to blend a stabilizer, a thermal conductivity improver and a pigment within a range not impairing the effects of the present invention.

  For example, hindered phenol-based drugs such as so-called BHT and Sumitizer (registered trademark) GA-80 manufactured by Sumitomo Chemical Co., Ltd. Trademark) ”and other benzotriazole-based, benzophenone-based agents, phosphorus-based agents, various hindered amine-based agents, fluororesin powders or silicone resin powders based on polyvinylidene fluoride, metal soaps such as magnesium stearate In addition, bactericides and deodorants containing silver, zinc, and these compounds, as well as various lubricants such as lubricants such as silicone and mineral oil, barium sulfate, cerium oxide, betaine, phosphate compounds, and phosphate ester compounds An inhibitor or the like may be added, or may exist by reacting with the polymer. In particular, in order to further enhance the durability to light and various nitric oxides, a nitric oxide scavenger, for example, HN-150 manufactured by Nippon Hydrazine Co., “Hostanox (registered trademark)” SE10 manufactured by Clariant Corporation, etc. It is preferable to contain a thermal oxidation stabilizer.

  In order to promote melting and thermal softening, it is preferable to contain, for example, alumina, boron nitride, aluminum nitride, silica, silicon nitride, magnesium oxide, magnesium carbonate, silicon carbide or the like as a thermal conductivity improver.

  For example, the pigment preferably contains titanium oxide, zinc oxide, zirconium phosphate or the like. Among these, titanium oxide is preferred from the viewpoint of suppressing the glare caused by peeling of the elastic fibers and obtaining a composite laminate having a homogeneous appearance in which the elastic fibers are not noticeable. As long as it is titanium oxide, either a rutile type or an anatase type is preferably used. Further, from the viewpoint of suppressing reflection of light and stably producing a polyurethane elastic yarn, it is preferable that the average primary particle diameter is in the range of 0.15 μm to 0.3 μm. The content in the polyurethane elastic fiber is preferably 0.3% by mass or more from the viewpoint of preventing glare, and from the viewpoint of stably spinning the polyurethane elastic fiber to prevent clogging of the die. It is preferable that it is 3 mass% or less.

  In order to promote melting and thermal softening, it is preferable to contain, for example, alumina, boron nitride, aluminum nitride, silica, silicon nitride, magnesium oxide, magnesium carbonate, silicon carbide or the like as a thermal conductivity improver.

  N, N-dimethylacetamide (hereinafter abbreviated as DMAc), dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone and the like can be used as a solvent when the polyurethane polymer is used as a solution. It is the most commonly used solvent.

  The solution concentration of the polyurethane polymer is preferably a dry spinning method for obtaining filament yarns of polyurethane elastic fibers at a solution concentration of 30 to 50% by mass (based on the total mass of the solution).

  In the present invention, the method for spinning polyurethane-based elastic fibers from a polyurethane polymer is not particularly limited. For example, 1) As a spinning method for polyurethane-based elastic fibers using diol as a chain extender, melt spinning is used. A method, a dry spinning method or a wet spinning method can be employed. 2) As a spinning method for polyurethane-based elastic fibers using diamine as a chain extender, a normal dry spinning method can be employed.

  In the present invention, the use of a filament yarn of polyurethane-based elastic fiber is suitable from the viewpoint of high stretchability, particularly stretch recovery stress, but the elastic fiber itself tends to be noticeable. Therefore, the following fiber specifications and combinations are preferable.

  Although the fineness of the fiber which comprises a fabric can be suitably selected according to the use used, the range of 0.1-5000 dtex is preferable.

  The fineness of the fabric constituting the composite laminate in the present invention represents the maximum fineness of the fibers distributed on the fabric surface.

  The fineness of the fibers constituting the fabric is more preferably from 0.1 to 500 dtex, more preferably from 0.1 to 50 dtex, and most preferably from 0.3 to 30 dtex from the viewpoint of highly uniform wrinkle formation. And from a viewpoint of the touch in a composite laminated body, Preferably, it is 0.2-5 dtex, Most preferably, it is 0.2-2.0 dtex.

  Further, the fineness of the elastic fiber is preferably 3000 dtex or less, more preferably 350 dtex or less. In the present invention, the elastic fiber is composed of a multifilament having a single yarn fineness of 8 dtex to 25 dtex.

  If the single fiber fineness of the elastic fiber is less than 8 dtex, the elastic fiber cannot endure the friction with the guide or roller or the heat received from the hot melt adhesive during the production of the composite laminate, and the elastic fiber is caused by the breakage of the single yarn. There is a tendency that breakage of the fiber itself tends to occur, and when the single yarn fineness exceeds 25 dtex, the adhesion index deteriorates, resulting in unevenness in the convergence property of the elastic fiber, and friction with the guide and the roller during the production of the composite laminate. Also, the unevenness tends to increase and yarn breakage tends to occur. Further, when elastic fibers having an elastic fiber fineness exceeding 3000 dtex are used, there is a tendency that the sensor side cannot endure the running friction during the production of the composite laminate and is damaged.

  In the composite laminate of the present invention, from the viewpoint of appearance quality, the ratio of the fineness of the elastic fiber to the maximum fineness of the fiber distributed on the fabric surface needs to be 0.5 or more and 300 or less.

  In order to obtain a composite laminate in which the presence of elastic fibers in the composite laminate is difficult to distinguish, i.e., a homogeneous laminate with inconspicuous elastic fibers, the influence of surface reflected light is more dominant than transmitted light. The maximum fineness of the fibers distributed in the fiber and the fineness ratio between the elastic fibers are important.

  If the ratio of the fineness of the elastic fiber to the maximum fineness of the fiber distributed on the fabric surface exceeds 300, the presence of the elastic fiber is noticeable and the appearance quality is impaired.

  When the ratio of the fineness of the elastic fiber to the maximum fineness of the fiber distributed on the fabric surface is 0.5 or more and 300 or less, the presence of the elastic fiber cannot be easily recognized visually, and the appearance quality is particularly excellent.

  This effect appears more remarkably when the maximum fineness of the fibers distributed on the fabric surface is in the range of 0.2 to 2.2 dtex, and more prominently is 0.5 to 2.0 dtex. If the ratio of the fineness of the elastic fiber to the maximum fineness of the fiber distributed on the fabric surface is greater than 300, the presence of the elastic fiber in the composite laminate may be clearly visually discernible. It becomes easier to discriminate visually, and the appearance and aesthetics of the composite laminate are deteriorated. When the fineness ratio is less than 0.5, the elasticity of the elastic fiber is substantially insufficient, wrinkles are hardly formed, and stretchability is not exhibited.

Furthermore, in the composite laminate according to the present invention, in order to obtain a composite laminate 10 having a homogeneous appearance in which elastic fibers are not visible or inconspicuous, the color difference variation ΔE ^* v defined as follows is not more than a specific value. (1.0 or less) is preferable. The color difference variation ΔE ^* v is a value calculated from an L ^* value, an a ^* value, and a b ^* value in a Lab color system using a non-contact type spectrocolorimeter, which will be described later. The L ^* value in the Lab color system is an index representing lightness, the a ^* value is a position between red and green, and the b ^* value is an index representing a position between yellow and blue. As the color difference variation ΔE ^* v is larger, the change in the color difference at the intersection with the elastic fiber is larger. Therefore, it is easier to see the elastic fiber and to confirm the presence of the elastic fiber in appearance. When the color difference variation ΔE ^* v is 1.0 or less, the elastic fiber cannot be seen or the presence of the elastic fiber cannot be confirmed, or the elastic fiber is very difficult to see or its existence is very difficult to confirm. The required characteristics will be met.

  In the present invention, the elastic fiber may be an original yarn, and it is also preferable to use a fabric or a fiber constituting the fabric that is colored in advance. Although it does not specifically limit about the coloring method of a fabric and the fiber which comprises it, From the viewpoint of coloring with the same color as an elastic fiber, it is also preferable to color by cheese dyeing etc. which can adjust a color.

  Preferred as the elastic fiber used in the present invention is that there is no practical problem, including process passability, and excellent shape at the point where the elastic fiber and the resin extending in one direction intersect. From the viewpoint of obtaining, those having a thermal softening point in the range of 100 ° C. or higher and 240 ° C. or lower are preferable. When the heat softening point is lower than 100 ° C., the form may be destroyed by heat treatment from a resin extending in one direction at the time of tumbler drying or composite laminate production, such as dyeing process and practical use. If it is higher, the compatibility between the resin extending in one direction and the elastic fiber is low, which may adversely affect the formation of wrinkles. The range of the thermal softening point is more preferably 110 ° C. or higher and 200 ° C. or lower, and most preferably 120 ° C. or higher and 160 ° C. Within this range, a heat roll, an ultrasonic welder, a high frequency welder, an electromagnetic induction welder, or a composite welder thereof, which is a well-known method, is used to extend in one direction in which a plurality of them are arranged in a direction crossing the elastic fiber. It is suitable for the resin constituting the elastic fiber and / or the material constituting the fabric to be softened or melted.

  In the fabric used for the composite laminate in the present invention, there are resins extending in one direction arranged in a direction intersecting with the elastic fibers, and the resins are hot melt adhesives, solvent-based adhesives, etc. Various adhesives and elastic fibers and / or materials constituting the fabric are heat-softened or melted.

  When the material constituting the fabric is heat-softened or melted, various known methods such as heat embossing and ultrasonic fusion can be employed.

  It is also preferable that a mechanical entanglement method such as a needle punch or a water jet is added to the resin region extending in one direction.

  Furthermore, a resin preferable as a resin extending in one direction is a resin containing the same kind of material as that of the fabric and elastic fibers in order that the present invention enhances the effect thereof, and more preferably includes a component of the fabric and elastic fibers. preferable. When a resin containing such a fabric or elastic fiber component is used as the resin extending in one direction, it is also preferable to thermally soften or melt the fabric or elastic fiber to form a resin extending in one direction. The most preferable case is when the fabric and the elastic fiber are both heat-softened or melted.

  The composite laminate of the present invention is a composite laminate having elasticity, and is a garment that is in close contact with the skin, specifically underwear, sportswear, diapers for children and adults, sanitary products, masks, and medical wear. It is suitable for use in hygiene materials such as surgical clothes, bandages, supporters, medical materials, etc., and also because of its excellent aesthetics, interior products such as curtains and furniture, bedding, lining, girdles, bras, inti Applications include mate products, clothing waistbands, stretch sportswear, and stretch outerwear.

  Hereinafter, evaluation of the composite laminate according to the present invention will be described using examples. First, a method for measuring and evaluating each characteristic used in the description of the present invention will be described.

[Thermal softening point]
The thermal softening point was measured as one of the heat resistance indicators of elastic fibers. The elastic fiber was measured for temperature dispersion of the dynamic storage elastic modulus E ′ at a heating rate of 10 ° C./min using a dynamic elastic modulus measuring device RSAII manufactured by Rheometric. The thermal softening point was determined from the intersection of the tangent line in the plateau region of the E ′ curve and the tangent line of the E ′ curve where E ′ descends due to thermal softening. Note that E ′ is a logarithmic axis and temperature is a linear axis.

[Fineness of fabric]
The fibers on the surface of the fabric are observed using a scanning electron microscope, the maximum value (α) of the diameters of 10 randomly selected surface fibers is measured, and the density (ρ) g / m of the substance constituting the fabric ³ was obtained from the following formula.
Fineness (dtex) = ρ × π × (α / 2) ² × 10000

[Fineness of elastic fiber]
In the present invention, the fineness of the elastic fiber is an apparent fineness measured according to ISO2060, and the measurement method is as follows. The sample of the elastic fiber used for the measurement of the apparent fineness is a sample that is allowed to stand for 24 hours in an environment of 20 ° C and 65% relative humidity. The elastic fiber is cut to a length d (unit: m) under no load, and an apparent fineness (dtex) = yarn mass (g) of length d (m) × 10000 ÷ d is obtained to one decimal place. Here, the length d is usually 0.1 m, but it is not necessary to be a single continuous fiber, and the total length d ′ of the plurality may be 0.1 m. In this case, when a sample of elastic fibers is taken out from the composite laminate, the elastic fibers arranged between the two fabrics may be sampled from a location separated from each fabric. For example, the composite laminate is cut with scissors along a resin extending in one direction and arranged in a direction intersecting the elastic fibers, and the elastic fiber pieces having a good linear shape have a total length. The dimensions are measured with an optical microscope until 0.1 ± 0.01 m, a plurality of elastic fiber pieces are selected, and the total length d ′ is obtained. Next, there is a method in which the total mass of a plurality of elastic fiber pieces selected with a precision balance is measured, and the total mass (g) × 10000 ÷ d ′ of the elastic fiber pieces is calculated to obtain the fineness of the elastic fibers.

[Fusion index of elastic fibers]
The elastic fiber was unwound while rolling the elastic fiber wound body. At this time, 400% stretched elastic fiber is fed at a feed rate of 50 m / min, and the number of yarn cracks is measured by enlarging the yarn cracks via a cross roll. Yarn breaks are observed as bent nodes. Twenty winding bodies were inspected to determine the number of occurrences of yarn breakage, and the number of yarn breakage (average value) per 100 m of elastic fiber was determined and used as a coalescence index.

[Measure color variation of composite laminate]
The composite laminate to be measured is stretched to the maximum in the stretching direction and fixed, and black on the lining (L ^* = 20 ± 1, a ^* = 0.2 ± 0.2, b ^* = 0.3 ± 0.2) ) Was placed. Using a color master (D25 DP-9000 type signal processor) as a non-contact type spectrocolorimeter, colorimetric diameter φ = 1 mm, L ^* value, a ^* value, b in L * a * b * color system ^* 40 values were measured at intervals of 0.5 mm in the width direction of the composite laminate. From the measurement results, the color difference fluctuation “ΔE ^* v” is set such that the point with the maximum value of L * is L ^* 1, a ^* 1, b ^* 1, and the point with the minimum value is L ^* 2, a ^* 2, b ^* 2. Was obtained from the following formula.
^{ΔE * v = √ [(L} * 1-L * 2) 2 + (a * 1-a * 2) 2 + (b * 1-b * 2) 2]

[Process passability]
A composite laminate was prepared under the following conditions (see FIG. 1 for the yarn path), and the number of yarn breaks at the design roller section per 10,000 m of elastic fiber and the total number of yarn breaks were determined.
Elastic fiber feeding speed: 50 m / min
Draft when inserting elastic fiber between fabrics: as shown in Table 1

[Evaluation of appearance of wrinkles of composite laminate (uniformity of wrinkles)]
The composite laminate was stretched 20% in the MD direction, fixed at both ends with a length of 30 cm, and allowed to stand for 24 hours in a temperature of 20 ° C. and 65% relative humidity environment. Judgment was made.
《Evaluation of 襞》
A: There are no turbulences in the habit.
A: 1 to 3 wrinkle disturbances.
(Triangle | delta): The disorder | damage | failure of a ridge is 4-10 places.
×: 10 or more wrinkles

[Example 1]
As shown in Table 1, 235 dtex polyurethane elastic yarn (thermal softening point: 220 ° C., number of single yarns: 14, single yarn fineness: 16.8 dtex) as elastic fibers, 12 when inserted between fabrics. Inserted 3 times. The adhesion index of this polyurethane elastic yarn was 0. PP (polypropylene) non-woven fabric having a three-layer laminated structure of spunbond layer / melt blow layer / spunbond layer (indicated as “SMS” in Table 1) as a composite laminate fabric, It was used at a basis weight of 17 g / m ² and a surface fiber fineness of 1 dtex. Therefore, the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric in the present invention was 235. A rubber-based hot-melt adhesive is used as the resin for joining the polyurethane elastic yarn and the nonwoven fabric as the fabric, and a commercially available standard product with a high cohesive force (manufacturer: Bostic Nitta Corporation, product number: AFX-162) was applied as a design coat at a coating amount of 20 g / m ² . As a result, as shown in the evaluation results in Table 1, the color difference variation ΔE ^* v is 0.6 and 1.0 or less, and the threading number in the design roll section and the total thread breakage are related to process passability. The number of times is 0, the uniformity of the wrinkles as the appearance shape of the wrinkles is ◎, the target regularity, high uniformity of beautiful wrinkles, excellent aesthetics of appearance, and stable with few yarn breakage Thus, a composite laminate that can be produced was obtained.

[Examples 2-8, Comparative Examples 1-4]
As shown in Table 1, one of the conditions was changed as compared with Example 1 (the heat softening point of the polyurethane elastic yarn was 220 ° C.). In Examples other than Example 4 and Example 8, filaments as elastic fibers were bonded together by false twisting with a predetermined pressure of compressed air on a thread line at the bottom of the spinning cell. In Example 4, the filaments were bonded by false twisting to the thread line at the lower part of the spinning cell with air pressure of 1/2 the pressure of Example 1. In Example 8, the filaments were bonded by false twisting to the thread line at the lower part of the spinning cell with air pressure of 1/2 the pressure of Example 5.

  As shown in Table 1, in Examples 1 to 8, the conditions specified in the present invention were satisfied, so that there were wrinkles having high regularity and uniformity with little disturbance, and the presence of elastic fibers was conspicuous. A composite laminate having an excellent appearance with no aesthetics was obtained, the process passability was also good, and stable production was possible. However, in Examples 4 and 8, elastic fibers having a coalescence index exceeding 10 were used, so that the process passability and the uniformity of wrinkles were slightly lowered, but both were within the acceptable range.

On the other hand, in Comparative Examples 1 to 4, since it does not satisfy any of the conditions defined in the present invention, it is a composite that satisfies both the aesthetics in which the presence of elastic fibers is inconspicuous and the target performance of wrinkles and has excellent processability A laminate was not obtained. That is, in Comparative Examples 1 and 2, since the single yarn fineness of the elastic fiber (polyurethane elastic yarn) was particularly small, both process passability and wrinkle uniformity deteriorated. In Comparative Examples 3 and 4, since the ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric was particularly large, satisfactory evaluation was not obtained with the uniformity of the wrinkles, and the color difference variation ΔE ^* v was An aesthetic property of excellent appearance was not obtained in that the elastic fiber exceeded 1.0 and the elastic fiber was conspicuous.

  The composite laminate according to the present invention can be applied to any composite laminate that is required to have a stretchable gathered portion, and is suitable for underwear, sportswear, or hygiene items such as diapers for children and adults, sanitary products, etc. It is suitable for applications such as materials.

DESCRIPTION OF SYMBOLS 1 Polyurethane elastic thread 2 Polyurethane elastic thread wound body 3 Constant speed roller 4 Variable speed roller 5 Tension sensor 6 Nip roller 7 Fabric wound body 8 Fabric 9 Application roller 10 Composite laminated body

Claims (10)

Between two fabrics,
A plurality of elastic fibers arranged in parallel in one direction;
A composite laminate comprising a plurality of the fabrics arranged side by side in one direction intersecting with the elastic fibers and a resin that joins the elastic fibers and the elastic fibers,
The two fabrics and the elastic fibers are spaced apart from each other where the elastic fibers intersect in the longitudinal direction of the elastic fibers,
The ratio of the fineness of the elastic fiber to the fineness of the fiber constituting the fabric is 0.5 or more and 300 or less, and
The composite laminate, wherein the elastic fiber is a multifilament having a single yarn fineness of 8 dtex to 25 dtex.   The composite laminate according to claim 1, wherein the elastic fiber has a fineness of 350 dtex or less. When measuring the color of the outer surface of the fabric from the outside of the composite laminate in a direction intersecting with the elastic fibers with the spectrocolorimeter in a state where the composite laminate is extended to the maximum in the extending direction of the elastic fibers, L ^{* L *} value value at the point showing the maximum value, ^{a *} value, ^{b *} value ^{(L * 1, a * 1} , b * 1) and ^{L * L} value at the point showing the minimum value ^* value, a The composite according to claim 1 or 2, wherein a color difference variation ΔE ^* v defined by the following formula using a ^* value and a b ^* value (L ^* 2, a ^* 2, b ^* 2) is 1.0 or less. Laminated body.
^{ΔE * v = √ [(L} * 1-L * 2) 2 + (a * 1-a * 2) 2 + (b * 1-b * 2) 2]   The composite laminate according to any one of claims 1 to 3, wherein a bonding index of the elastic fibers is less than 10.   The composite laminate according to any one of claims 1 to 4, wherein a thickness of the composite laminate at a location where the resin extending in one direction and the elastic fiber intersect is 0.1 mm or more and 2.0 mm or less. .   The maximum value of the thickness of the composite laminate between the elastic fiber adjacent to the longitudinal direction of the elastic fiber and the elastic fiber intersecting with the elastic fiber is 1 mm or more and 20 mm or less. A composite laminate according to any one of the above.   The width | variety per one of the said resin extended in one direction in the state extended | stretched to the maximum in the extension direction of the said elastic fiber of a composite laminated body is 0.2 mm or more and 10 mm or less. The composite laminated body in any one.   The composite according to any one of claims 1 to 7, wherein an interval of the resin extending in one direction is 1 mm or more and 20 mm or less in a state in which the composite laminate is extended to the maximum in the extending direction of the elastic fiber. Laminated body.   The composite laminated body in any one of Claims 1-8 whose heat softening point of the said elastic fiber is 100 degreeC or more and 240 degrees C or less.   The composite laminate according to any one of claims 1 to 9, wherein the resin extending in one direction contains the same component as the constituent component of the fabric and / or the elastic fiber.