KR20040020627A - Method for producing microfilament suede-like textiles - Google Patents

Abstract

PURPOSE: Provided is a suede microfiber knitted fabric which involves excellent flexibility and elasticity, soft tactility and fine appearance. CONSTITUTION: In a method of manufacturing the suede microfiber knitted fabric, the facing yarn with eluate and fiber formation components is formed with a polyester-based sea island yarn with a fineness of 0.03-0.3, and the back yarn is formed by interlacing a polyester sea island yarn with 0.03-0.3 denier of a high shrinkage polyester-based filament. The facing and the back yarns are knitted with each other by using a spandex fiber to make a knitted fabric, and the knitted fabric is napped, buffed and heat-treated. The eluate component is extracted from the sea island yarn of the knitted fabric, which is then dyed, dipped in a polyurethane solution at its back yarn, solidified, dried, and buffed.

Description

Method for producing suede-like microfiber knit {Method for producing microfilament suede-like textiles}

The present invention relates to a method of manufacturing a suede-like microfiber knitted fabric, and more specifically, a method of manufacturing a suede-like microfiber knitted fabric which can give a natural suede feeling through post-processing of a knitted fabric using sea island yarn, high shrink yarn, and elastic spandex fiber. It is about.

In the manufacture of suede-like knitted fabrics, a technique for producing a suede having a touch closer to natural suede by using microfiber has been developed, and related technologies such as improvement of touch, color, and process have been continuously developed. In general, knitted suede is made of microfiber extractable, rectangular, split or island-in-the-sea composite fiber yarns and general synthetic fibers as the warp yarns, or knits to make the composite fibers finer and finer. There is a method of raising or buffing the fibers, and stapling the split microfibers in which the insoluble fiber component such as nylon or polyester and the usable polymer component are spun together, and the fiber is mixed with the punching, carding and needle punching. After making a non-woven web, it was impregnated in a polyurethane resin solution, solidified in water, and then removed from the usable polyester component with an aqueous alkali solution to prepare an artificial leather composed of microfiber with a single yarn fineness of 0.005 ~ 0.05 denier Finish by buffing, dyeing and finishing.

However, the conventional nonwoven artificial leather produced by the above conventional method has a problem that the density of the fibers of the nonwoven fabric itself is difficult to be evenly distributed due to the manufacturing process and structure of the nonwoven fabric, and elutes the polymer of the usable component after polyurethane impregnation. It has a disadvantage that it is difficult to do post-processing.

Therefore, the present invention is to provide a method of manufacturing a suede-like microfiber knit fabric having excellent elasticity and elasticity, soft touch and beautiful appearance that can solve all the problems of the prior art as described above.

In order to solve the above problems, the present inventors can interlace the island-in-the-sea yarn and the high shrink polyester filament in the manufacturing process of the existing suede and arrange the warp knitted fabric by arranging the warp knitted fabric to increase the volume feeling due to the difference in shrinkage. When elasticity is given by using spandex fiber as intermediate yarn between both sides of the knitted fabric consisting of seaweed yarn, it can reduce stiffness and impart elasticity, and it is easy and stable after processing by eluting eluting component from seaweed yarn before impregnation of polyurethane. It has been found that the present invention can be completed to complete the present invention.

Therefore, according to the present invention, in the method of producing a suede-like microfiber knitted fabric,

The surface yarn is composed of an eluting component and a fiber forming component, and a polyester-based island-in-the-sea yarn having a single yarn fineness of 0.03 to 0.3 denier after elution is used. A high shrinkage polyester filament with 0.03 to 0.3 denier fineness is interlaced, the surface yarns and the back yarns are spliced by using spandex fibers, knitted, then brushed, buffed, heat treated, and extracted and dyed in the island-in-the-sea yarn. Thereafter, a method for producing a suede-like microfiber knit fabric comprising a process of impregnating, solidifying, drying and buffing a polyurethane solution on the back side is provided.

Hereinafter, the present invention will be described in more detail.

The suede-like microfiber knit fabric of the final product of the present invention uses a polyester-based island-in-the-sea yarn as a surface yarn, a entangled yarn of polyester-based island-in-the-sea yarn and a high-shrink polyester-based filament as a back yarn, and a spandex fiber as an intermediate yarn. After raising, buffing, heat-treating and extracting and dyeing the elution component in the island-in-the-sea yarn, it is a suede-like microfiber knit fabric having elasticity while impregnating, solidifying, drying and buffing a polyurethane solution on the back side.

In the present invention, the fiber used for the surface yarn is a filament composed of an eluting component and a fiber forming component as a polyester-based island-in-the-sea yarn. It is preferable that the said island-in-the-sea yarn uses polyester-type resin as a island component, and uses co-polyester-type resin from which a island component and solvent solubility differ as a sea component. In order to retain the characteristics of the suede fabric as a final product, it is preferable that the sea component is eluted during the post-processing process and the fineness after the elution of the single yarn fiber of the island component is about 0.03 to 0.3 denier.

In the present invention, the backside yarn is composed of interlacing yarns of polyester-based islands and high-shrink polyester filaments, but the use of interlacing yarns in which air-interlaced polyester-based islands and high shrink polyester filaments of 2.0 to 4.0 denier is used. desirable. The high shrink polyester filament used in the present invention is a yarn that shows the same physical properties as a general yarn when knitted, but exhibits high shrinking properties when hot water is encountered in refining and dyeing processes. The polyester filament preferably uses a filament having a non-shrinkage ratio of 20 to 30%, which shows a non-shrinkage ratio of 2 times or more than a general polyester filament, and is subjected to post-shrink processing by interweaving with polyester-based sea island yarns. Due to the difference between polyester islands and shrinkage, a natural loop is formed, the raising process is easy, and the suede effect of the fabric is improved.

In the present invention, it is possible to produce a knitted fabric by connecting the yarns constituting the surface yarn and the backside yarn with a good elastic spandex fiber. The spandex fiber plays a role of properly connecting the surface yarn and the backside yarn to serve to give elasticity to the whole knitted fabric. The spandex fiber to be used preferably has a fineness of 30 to 70 denier.

In the present invention, the island-in-the-sea yarn is used as the surface yarn, and as the back yarn, the interwoven yarn of the island-in-the-sea yarn and the high shrink polyester filament is used, and the spandex fiber is used in the middle layer to produce a knitted fabric with a general tricoat structure. The knitted fabric is made by cutting and raising the island-in-the-sea yarn through raising and shearing. The brushing treatment is performed 3 to 8 times with a brush, and the shaling treatment is performed to even the surface. Next, it is good to heat treatment to prevent excessive shrinkage in the weight loss and dyeing process. In this case, the shape stability may be maintained by processing within 170 seconds at 170 to 180 ° C.

Next, weight loss and dyeing are performed. Here, since the weight loss process is an important process for determining the fineness of the island-in-the-sea yarn, the amount and the treatment time of alkali are important. In the case of general fabrics, caustic soda is used at 1 ~ 10% weight% in a rotary washer and treated at 95 ℃ for 30 minutes.However, in the case of knitted fabrics, it helps to maintain shape stability and easily penetrates alkali. The amount of caustic soda used is determined within% weight%, and the treatment temperature should be about 95 ° C for 30 minutes. At this time, the weight loss ratio should be adjusted within the range of 25 ~ 35%, but if it is less than 25%, the microscopic effect of weight loss is not properly expressed. Because of this, it is necessary to pay attention because it causes the appearance defect and the strength of the product.

The ultra-fine knitted fabric is dyed using a disperse dye in a high-pressure rapid dyeing machine and the heat-dry setting is performed through the dyeing paper within 170 seconds at 170 ~ 180 ℃. The surface suede knitted fabric to be obtained by brushing and buffing the dry heat-treated dyed paper is prepared. Raising treatment is treated 3 to 8 times with a brush, and when the buffing treatment is good to use the sandpaper No. 150 ~ 300 sandpaper.

The brushed and buffed knitted fabric is coated with a polyurethane elastomer to fill and express moist and elastic properties and improve the support of micro-napping. As the polyurethane elastic body used here, it is preferable to use a polyester-based or polyether-based polyurethane having a solid content of about 30 to 40%. As the solvent, 4,4-dimethylformamide, which is commonly used, is used. Polyurethane is difficult to be used alone due to its unique viscosity, so it is mixed with a solvent and stirred. At this time, the mixing ratio of the polyurethane and the solvent is 1: 3 to 1: 4 so that the solid content concentration is about 10 ± 5%. It is used by stirring sufficiently for about an hour. Coating is performed by impregnating the diluted polyurethane solution in a general wet coating machine. When impregnated, the amount of polybutane filling is 5-10% of the total weight of suede. If the filling amount is less than 5%, there is no feeling of elasticity when held by polyurethane filling. It is difficult because the feeling of polyurethane filler is expressed too strongly rather than inherent surface effect.

In the present invention, in raising the knitted fabric after finishing the knitting, the dyeing is completed and set, and then brushed before the polyurethane impregnation process can be produced suede-like microfiber knitted fabric. In this case, the penetration of polyurethane into the inside of the knitted fabric is facilitated and the impregnation amount is increased, so the elasticity is more excellent.

It is preferable to remove the polyurethane filler adhering to the surface of the knitted suede by buffing the dyed paper with 150 to 300 sandpapers and to subdivide the surface island yarns once again. When setting the buffed knitted suede for 40 to 60 seconds at 170-180 ° C, the treatment speed is not sufficient to express the weight and width at 40 seconds or less, and the weight and width cannot be properly expressed. Due to the hard touch, the suede effect can not be expressed.

In the following examples, non-limiting examples of producing suede-like microfiber knit fabrics using polyester-based island-in-the-sea yarns, high shrinkage polyester filaments, spandex yarns, and the like are given.

Example 1

Through the weight reduction process, the island-in-the-sea yarn with the final fineness of 0.04 denier is used as the surface yarn, and the spandex 40 denier is used as the intermediate yarn, and the high shrink yarn (non-shrinkage rate 24%) with the island-in-the-sea yarn and single yarn fineness of 2.5 denier used for the surface yarn. Interlaced yarns are made with 70 interlaced yarns per meter to make 28 gauge 105-inch warp yarns using the final fineness of 105 denier blended yarns as backside yarns. The warp knitted paper thus prepared was treated 6 times in a brush and brushed, and then set to dry heat at 170 ° C. for 30 seconds. After setting the weight loss, add 2 wt% of caustic soda at 95 ℃ for 30 minutes in the liquid reducer, and disperse dye CI dispersion red 60 (CIDisperse Red 60) at 125 ℃ for 30 minutes in a high pressure dyeing machine. CI Disperse Dye Blue 56, C.I. Disperse dye Yellow 54 (C.I. Disperse Yellow 54) three color matching (color matching), dyeing and washing with water, set at 170 ℃, 30 seconds to complete the dyed paper. The finished dyeing paper was diluted with a ratio of 1: 3 polyurethane and 4,4-dimethylformamide with a solid content of 30%, impregnated in a polyurethane solution with a solid content of 10%, and coagulated by passing through a washing tank. After setting at 170 ° C. for 30 seconds, it was buffed with 300 mesh sandpaper and again set at 170 ° C. for 30 seconds to prepare a suede-like microfiber knitted fabric of the present invention which was 52 inches 370 grams / yard. The warp knitted suede thus prepared was excellent in touch and rich in the lighting effect of the surface, thereby obtaining the same product as natural suede.

Example 2

After dyeing and drying in Example 1 was treated with 6 times brushed before impregnating the polyurethane solution to the solid content of the diluted polyurethane to 15%, the rest of the process was carried out in the same manner as in Example 1.

Comparative Example 1

A suede-like microfiber knitted fabric was prepared in the same manner as in the manufacturing method of Example 1, but was performed using only 3 denier-grade general polyester yarn in the backside yarn.

Comparative Example 2

A suede-like microfiber knitted fabric was prepared in the same manner as in the manufacturing method of Example 2, but was performed using only 3 denier-grade general polyester yarn in the backside yarn. Process characteristics are shown in Table 1.

As described above, the physical properties of the suede-like microfiber knitted fabric prepared in accordance with Table 1 are shown in Table 2.

division Yarn Composition fair Back side yarn (island) Middle sand (fineness) Surface thread (fineness) Example 1 Kyorusa (0.04), High Conqueror (2.5) Spandex (40) Monk (0.04) Post Dyeing Coating Example 2 Kyorusa (0.04), High Conqueror (2.5) Dyeing, after brushing Comparative Example 1 General History (3.0) Post Dyeing Coating Comparative Example 2 General History (3.0) Dyeing, after brushing

touch Lighting effect Example 1 ◎ ◎ Example 2 ◎ O Comparative Example 1 O △ Comparative Example 2 O O

◎ Very good, Excellent, △ Normal

As described above, according to the present invention, it is possible to give a soft touch and elasticity due to the use of spandex, which is not seen in conventional artificial suede and nonwoven suede, and to increase the volume by the difference in shrinkage between fibers constituting the backside yarn. It is possible to manufacture suede-like microfiber knitted fabrics that can be used as high-quality exterior materials such as high-quality clothing and furniture, which has excellent soft touch and beautiful appearance, and facilitates post-processing by eluting the eluting component from sea island before impregnation of polyurethane. There is a process advantage that can be made stable.

Claims (3)

In the manufacturing method of suede-like microfiber knit fabric, The surface yarn is composed of an eluting component and a fiber forming component, and a polyester-based island-in-the-sea yarn having a single yarn fineness of 0.03 to 0.3 denier after elution is used. A high shrinkage polyester filament with 0.03 to 0.3 denier fineness is interlaced, the surface yarns and the back yarns are spliced by using spandex fibers, knitted, then brushed, buffed, heat treated, and extracted and dyed in the island-in-the-sea yarn. After, impregnating, solidifying, drying and buffing a polyurethane solution on the back surface, the method of manufacturing a suede-like microfiber knit fabric. The method of manufacturing a suede-like microfiber knit fabric according to claim 1, wherein after raising the dyed knit fabric in raising the knit fabric, the fabric is brushed before the polyurethane impregnation process. The method of claim 1, wherein the polyurethane impregnation amount is 5 to 10% by weight based on the total weight of suede.