JP2942288B2 - PROCESS FOR MANUFACTURING SUEDED napping sheet having pattern - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a luxurious suede brushed sheet having durability and a pattern in which fluff length and color tone are continuously changed.

[Prior Art] It is a well-known fact that many people have conventionally used a technique of changing the surface fluffiness of a nap surface or giving a pattern to give an informal feeling. As a method for producing such a napped sheet, a method in which the structure of a woven or knitted material is changed or a fiber in which two or more kinds of fibers having different coloring properties are entangled as in JP-A-63-175149 has been proposed. However, these methods require processing time and are not only disadvantageous in terms of cost, but also very difficult to cope with various patterns.

Also, JP-A-59-116448 discloses a method of dyeing fluff by printing a suede-like sheet having a fine-fiber nap surface with a fineness of 0.13 dr, and JP-A-60-21981. A method of applying a printing paste containing a substance capable of dissolving the fiber and a dye, followed by heat treatment to dye the printed portion and to shorten the fluff fiber is disclosed in JP-A-62-162085. There has been proposed a method of applying a pattern to the nap surface without impairing the feeling by printing the agent.However, in the pattern applying method using these printing types, the loss of the fluff feeling in the printed portion is large, Area is distinguished from the appearance and gives a print-like low-grade feeling.

In addition, a method of imparting an uneven pattern to a product raised surface or a substrate surface before raised by an embossing roll or the like is generally performed, but the pattern obtained by these methods lacks durability, and is not suitable for long-term use or washing. Is difficult to change.

Furthermore, Japanese Patent Application Laid-Open No. 63-303173 proposes a technique of imparting a pattern by injecting a high-pressure fluid in a direction in which the nap fibers of a nap cloth are turned down. However, it is aimed at the effect of cutting a part of the nap fiber, and it is unavoidable that the fluff feeling of the fluid ejecting part is inevitable, and it is quite difficult to give a fine pattern Not get.

Until now, there has been a demand for a method of producing a suede-like raised hair sheet having a durable three-dimensional appearance and a pattern rich in color tone change, which has a high quality fluffiness and a good feel at a low cost by an easier method. However, no suitable method has yet been found.

[Problems to be Solved by the Invention] The present invention, when producing a suede-like sheet-like material having a durable surface and imparting a pattern without impairing the fluffiness, alleviates the problems of the prior art at a glance. It provides an excellent manufacturing method to solve.

Means for Solving the Problems The present invention forms an uneven pattern on the surface of a fiber sheet by hot pressing, impregnates and solidifies a polymer elastic body liquid, and then, in both the concave and convex portions of the surface, the fine fiber nap. This is a method for producing a suede-like nap-formed sheet material in which the nap state on the surface is continuously changed corresponding to the uneven pattern characterized by forming a nap.

The fiber sheet used in the present invention is a nonwoven fabric, a knitted fabric, a woven fabric, or a fibrous sheet having a structure capable of forming naps on the surface obtained by combining them, and at least one surface is composed of ultrafine fibers or ultrafine fiber generating fibers.

The microfiber-generating fiber is a sea-island structure, a core-sheath structure, and a lamination obtained by spinning two or more types of synthetic polymers having different solubilities and decomposability with respect to a solvent or a decomposer and a shrinkage ratio by a known spinning method. It is a conjugate fiber that can be transformed into ultrafine fibers by a solvent such as a structure, a decomposing agent, or a mechanical action. The synthetic polymer is selected from known materials such as polyamides, polyesters, polyacryls, polyolefins such as polyethylene, and polyurethanes. From the viewpoint of matching, polyamides such as nylon 6, 12, 66 and other copolymer nylons and polyesters such as polyethylene terephthalate and copolymerized polyethylene terephthalate are preferably used. As the dissolving or decomposing component, polyethylene or polystyrene, which easily softens and fuses at a relatively low temperature, is preferable because it does not require the use of a resin for shaping when forming a concavo-convex pattern. In addition, the fineness of the ultrafine fiber component is
From the viewpoint of feeling, it is preferably 0.5 denier or less, more preferably 0.1 denier or less.

As the ultrafine fibers used in the present invention, those obtained by the super draw method, those obtained by the melt blown method and the like are used. A method of denaturation into fibers is preferably used.

The fiber sheet of the present invention can be tertiary formed by placing a microfiber web on a knit, woven or nonwoven web composed of ordinary denier fiber or microfiber-generating fiber and blowing a high-speed fluid flow such as a needle punch or a high-pressure water flow. It is obtained by a method such as entanglement, knitting or woven fabric using ultrafine fiber-generating fiber, three-dimensional entanglement of ultrafine fiber-generating fiber web by needle punch or high-speed fluid flow, and entangled nonwoven fabric. .

Next, an uneven pattern is formed on the surface of the fiber sheet by hot pressing.For a fiber sheet whose surface is made of ultrafine fibers,
It is preferable to apply a paste such as polyvinyl alcohol from the viewpoint of prevention of adhesion of the elastic polymer and the shapeability. The purpose of forming the uneven pattern on the surface is that the fiber ratio of the fiber and the polymer on the sheet surface at the time of impregnation of the polymer elastic polymer in the next step is such that the basic convex portion after embossing has a higher fiber ratio than the concave portion. This is because, after the subsequent raising treatment, the composition ratio of the fiber and the polymer and the hair foot are continuously different in the uneven portion. In this way, after dyeing, a pattern of the raised hair surface in which the hair foot and the hue change continuously in the form of a handle is obtained. Further, the embossing die is not particularly limited, but in order to clarify the effect of the present invention, a depth of 10
Those having a size of 0 μm or more are desirable. Here, in order to facilitate the embossing treatment, a polymer having a low softening point, such as polyethylene, is preferably used as an intervening component to be removed in a later step of the mixed fiber, but is not particularly limited.

The elastic polymer used in the present invention is a polyurethane-based material,
Polyacrylic, rubbery, etc., to which pigments, dyes, stabilizers, etc. are added as necessary, but polyurethane is preferably used in terms of flexibility and the like.

The method of providing the elastic body is not particularly limited as long as the elastic body can be provided in a range including at least the surface layer of the fiber sheet. However, when polyurethane is used, a solution or a dispersion is used in terms of flexibility and the like. And wet coagulation is preferred.

Subsequently, the surface is raised, and prior to the raising, the ultrafine fiber-generating fibers are denatured into ultrafine fibers by a known method.

The raising method is not particularly limited, but a known method, for example, a method of raising with a clothing cloth or a method of buffing with a sandpaper is used. At this time, if the surface layer of the sheet-like material is brushed shallowly as shown in FIG. 1, the concave portion after embossing has a higher composition ratio of the polymer elastic body than the convex portion, and the fluff length is short, When the hue after dyeing is deviated from the hue of the elastic polymer, and the nap is deeply raised to the concave portion after embossing as shown in FIG. 2, the fiber density of the surface layer before resin impregnation by embossing is increased. The raised concave portion after embossing has a larger fiber composition ratio than that of the convex portion and a very long fluff length.

Next, depending on each fiber component, the raised hair sheet is dyed using a known method, and then the surface fuzz is adjusted with an emery paper, a bristle brush, a flocked cloth, or the like. The effect of feeling does not decrease. In addition, a finishing process such as kneading is performed as necessary to obtain a product.

[Operation] In the present invention, since a polymer elastic body is impregnated and solidified after forming a concavo-convex pattern on a fibrous sheet, the content of the polymer elastic body is larger at the extremely surface portion of the concave portion than at the convex portion, Conversely, the fiber ratio is slightly higher in the deep part than in the convex part. This difference in structure results in a difference in the napping property during napping, and only the surface layer portion is napped shallowly, so that the concave portion has a short nap length and is rather sparse. Conversely, if the raising process is carried out deeply, the nap length of the concave portion becomes longer and the nap density becomes higher. As a result, the napped state on the surface is continuously changed corresponding to the uneven pattern. Further, by dyeing, the three-dimensional appearance of the pattern is emphasized due to the difference in the coloring and texture between the piloerection and the elastic polymer. In addition, these effects are caused by structural differences during impregnation and coagulation of the polymer elastic body, so that their effects are not diminished even by washing or long-term use.

EXAMPLES Next, embodiments of the present invention will be described with reference to specific examples, but the present invention is not limited to these examples.
The percentages in the examples relate to weight unless otherwise specified.

Example 1 6-Nylon (island component) -polyethylene (sea component), the average fineness of the island component after removal of the sea component was about 0.007dr,
Needle punching was performed on sea-island mixed spun fibers having about 400 island fibers to obtain an entangled nonwoven fabric.

The surface of the nonwoven fabric was embossed with a grid pattern embossing roll having a surface temperature of 120 ° C, and then a 13% -N, N 'polyurethane elastomer composed mainly of a polyester-based polyurethane.
-Impregnated with dimethylformamide (DMF) solution and wet coagulated in DMF aqueous solution. Thereafter, the sheet was treated in tetrachloroethylene to remove polyethylene from sea components and to ultrafine nylon fibers. The surface of the obtained sheet had a state in which a large amount of polyurethane was placed on the concave portion after embossing. The surface of the sheet is brushed slightly deeper with sandpaper having a grain size of # 320, then dyed with a win dyeing machine using a red metal-containing complex salt dye, dried, and adjusted with emery paper, followed by kneading. Go to the product.

The obtained product had a slightly long nap in the lattice portion, a fluffiness and a hue continuously changing at the boundary of the lattice pattern, and had a three-dimensional pattern. And dry cleaning durability.

Comparative Example 1 In Example 1, embossing embossing was not performed before polyurethane impregnation, but embossing embossing was performed after polyurethane impregnation.

The obtained product was poor in change in nap length, the boundary of the lattice pattern was unclear, and as shown in Table 1, the product had poor washing resistance.

Comparative Example 2 In Example 1, polyurethane was impregnated, raised, and dyed without embossing, followed by embossing.

The obtained product had an embossed concavo-convex pattern on the surface, but had a flat appearance with no change in fluff length and hue. Also, the washing resistance was poor.

Example 2 The surface of the sheet-like material after the polyurethane-impregnated nylon fine fiber obtained in Example 1 was generated was brushed only on the outermost surface thereof with a sandpaper having a particle size of # 400 while lightly pressing. The same dyeing and finishing treatment was performed to obtain a product.

In the obtained product, the nap of the lattice part was slightly short-haired and slightly hue of mainly polyurethane color, whereas the other part was slightly longer nap and mainly hue of fiber color. . Further, the fluffiness and the hue continuously changed at the boundary of the lattice pattern to give a three-dimensional appearance. Further, as shown in Table 2, the durability against water washing and dry cleaning was good.

Comparative Example 3 In Example 2, embossing embossing before polyurethane impregnation was not performed, but embossing embossing was performed after polyurethane impregnation. Thereafter, only the outermost surface was similarly raised and dyed to obtain a napped sheet.

The resulting product has almost no fluffiness in the lattice part, and the boundary of the lattice pattern is clear, and the fluffiness and hue change discontinuously at the boundary, giving a poor three-dimensional appearance and giving a low-grade feeling. Was. Further, as shown in Table 2, the pattern was poor in washing resistance.

Comparative Example 4 In Example 2, embossing was performed after the polyurethane impregnation, the outermost surface raising, and the dyeing finish were performed without embossing.

The resulting product loses the fluffiness of the handle,
In addition, there was no change in the fluffiness and hue, giving a flat, so-called print-like low-grade feeling. Also, as shown in Table 2, the washing resistance was poor.

[Effect of the Invention] The suede-like raised hair sheet manufactured by the method of the present invention has a superior three-dimensional appearance because the fluff length and the hue change continuously at the boundary of the pattern. A raised sheet having a different fluff feeling depending on the degree of the raising treatment can be easily obtained. Moreover,
Excellent durability such as washing resistance. It does not require special equipment and can be manufactured by a simple process.

[Brief description of the drawings]

FIG. 1 is an example of a schematic cross-sectional view of a suede-like brushed sheet according to the production method of the present invention, and FIG. 2 is a schematic cross-sectional view of another embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the sheet-like material before the raising treatment according to the present invention. 1... Raised from the concave and convex pattern convex part 2... Raised from the concave and convex pattern concave part 3... Base layer 4...

Claims (1)

(57) [Claims] The present invention is characterized in that an uneven pattern is formed on the surface of a fiber sheet by hot pressing, a polymer elastic body liquid is impregnated and solidified, and then ultrafine fiber nap is formed on both concave and convex portions of the surface. A method for producing a suede-like raised sheet material in which the raised state of the surface is continuously changed corresponding to the uneven pattern.