KR100577987B1 - Manufacturing method of high density scrim composite nonwoven fabrics ? artificial leather suede - Google Patents

Abstract

The present invention is a separate calendering process for manufacturing a high-density nonwoven fabric by carding a fine type microfibers (0.1-0.2 denier after division) of 1-3 denier and laminating the divided sheet and the woven and knitted scrim in a composite structure It is characterized in that the high-density non-woven fabric of the laminated structure by water punching is produced through a polyurethane impregnation, surface processing process, thereby producing a lightweight artificial leather suede excellent in high density, high strength and surface touch, non-woven fabric It is possible to reduce fiber damage and loss during manufacture and to induce partial division of split yarns by water punching, thereby reducing the processing time in the elution process.

Nonwovens, Artificial Leather, Suede, Dissolution, Water Punching

Description

Manufacturing method of high density scrim composite nonwoven fabric and artificial leather suede {MANUFACTURING METHOD OF HIGH DENSITY SCRIM COMPOSITE NONWOVEN FABRICS & ARTIFICIAL LEATHER SUEDE}

1 is a schematic diagram of a splitting process by cross sectioning and water punching of a split microfiber used in the present invention;

2 is a process chart for manufacturing the nonwoven fabric and artificial leather suede according to the present invention; And

Figure 3 is a schematic diagram showing the cross-sectional structure of the nonwoven fabric after the combination of the structure and the fabric cream laminated portion.

The present invention relates to a method for manufacturing a high-density scrim composite nonwoven fabric for the production of artificial leather suede, and more specifically to the suede artificial leather using a nonwoven fabric manufactured by using a non-woven fabric using a split microfiber divided by chemical elution In manufacturing, it is possible to reduce the processing time in the elution process by partially inducing physical division while minimizing the damage of the split type single fiber complexed with two different types of polymer structures, and having a light weight, excellent surface feel, and a high density structure. The present invention relates to a method for manufacturing a scrim composite nonwoven fabric and artificial leather suede.

Conventionally, in the method of manufacturing high-quality artificial leather having a touch similar to that of natural leather using a nonwoven fabric made of ultrafine fibers, Korean Unexamined Patent Publication No. 97-8857 and Korean Unexamined Patent Publication No. 98-74188 describe In general, Korean Patent Laid-Open Publication No. 00-3012 discloses a method of manufacturing a nonwoven artificial leather using physically divided microfiber.

In this method, non-woven fabrics are manufactured in the form of islands by carding in the case of island-in-the-sea fabrics, non-woven fabrics are produced by needle punching, and seawater is removed by elution to remove artificial leather. In the case of physically divided microfiber, as in the island-in-the-sea type, the nonwoven fabric is manufactured by needle punching, and the nonwoven fabric artificial leather is induced without physical elution by inducing fiber division by physical friction by carding and needle punching during the nonwoven fabric manufacturing process. To prepare. As described in Korean Patent Laid-Open Publication No. 00-3012, two different polymers were spun at a mixing ratio of 85:15 to 70:30, followed by stretching heat setting and cutting to obtain 10 to 30% of the degree of division. More than 90% of the splitting occurs by carding and needle punching, and this process is limited to the case where the raw fiber has already partially splitted itself.

In particular, in the case of the island-in-the-sea type, the tear strength of the artificial leather is sharply dropped because of the elution process. Thus, non-woven artificial leather is manufactured by applying a long-fiber woven or knitted fabric as a reinforcing scrim.

On the other hand, the physical split type does not undergo a separate elution process, so the tear strength is excellent, but fiber damage and fine fiber dust are generated by needling during the nonwoven fabric manufacturing process.

Particularly, the method of manufacturing microfiber nonwoven fabric by needle punching uses high shrinkage fiber with high shrinkage rate of 15% or higher as a reinforcing material or high shrinkage scrim as a reinforcing material to increase density and increase surface density. It is manufactured through a normal polyurethane impregnation processing and a post treatment process.

An object of the present invention is to solve the above problems, high density scrim composite nonwoven fabric and artificial leather suede to minimize the fiber damage or process problems caused by the yarn characteristics and manufacturing method and to simplify the process It is to provide a manufacturing method.

In order to achieve the above object, the high-density scrim composite nonwoven fabric and artificial leather suede manufacturing method according to the present invention in the method for producing a nonwoven fabric for artificial leather suede manufacturing using a finely divided surface (PET / ESPET) as raw materials, Carding the split surface to create a web; Preparing a laminated sheet by cross-wrapping the web; Supplying a fabric scrim which is a polyamide fiber to the lower end of the laminated sheet and compressing the fabric scrim; Prewetting the composite structure of the sheet and fabric scrim with low pressure water; Water punching the composite structure several times with high pressure water after the prewetting; And drying and winding up the finished nonwoven fabric.

The tensile strength ratio of the MD / CD of the nonwoven fabric is characterized in that 0.8 to 0.9, the weight of the scrim is 50 to 70g / m ² , the density of the scrim is characterized in that 40 × 34 bone / inch, the water punching The pressure in the step is characterized in that 2.5 to 200 bar.

Hereinafter, with reference to the accompanying drawings will be described in detail a manufacturing method of high density scrim composite nonwoven fabric and artificial leather suede.

1 is a schematic diagram illustrating the process of division by a cross section and water punching of a split microfiber used in the present invention.

In Fig. 1, A denotes a split microfiber structure without water punching, B denotes an initial structure subjected to water punching (fine crack generation), and C denotes a split microfiber structure undergoing water punching (expansion and Division structure).

The raw material fiber of artificial leather suede according to the present invention is an eluted type split composite fiber having a cross-sectional shape shown in FIG. 1 and composed of two different polymers, and generally PA / PET and PET / E. S. PET and the like can be used representatively. In the present invention, the component A is composed of PET, the component B is composed of ES PET, the composition ratio of components A and B is 70: 30 after spinning and imparting the crimp to the fiber along with the stretching, through the heat setting and cutting process It is made of short fibers of 38 mm or 51 mm. The short fibers thus obtained are used to produce nonwoven fabrics and artificial leather suede through the orderly process shown in FIG. 2.

The process of manufacturing artificial leather suede is largely divided into a step (A) of producing a nonwoven fabric using the raw material fibers, and a step (B) of using a manufactured nonwoven fabric (A).

First, referring to step (A) of manufacturing a nonwoven fabric with reference to FIG. 2, PET / E in a bale state. The raw fiber of S. PET is opened and opened and mixed together (S1), and the partially opened raw fiber is manufactured in a web state through a carding process (S2) which performs open and fine operation (S2). S3). The web thus manufactured is laminated to suit the required weight in the cross lapping process (S4).

That is, the short fibers, which are raw fibers, are manufactured in a sheet by a carding process, and are then transferred to the water punching process by adjusting the number of lamination, stretching, and overlap so that a nonwoven fabric of 175 g / m ² or more is manufactured in a molding machine. At this time, the fabric scrim is supplied at the same time while receiving the minimum tension at the lower end of the laminated sheet as shown in Figure 3 (S5). At this time, the weight of the applied scrim is 50 ~ 70g / m ² , the density of the scrim is suitable 40 × 34 book / inch, polyamide-based scrim is used to minimize the effect on the physical properties during the dissolution in the post-process. Supplied divided sheet and fabric cream composite structure is pre-wetting (pre-wetting) is made of a non-woven fabric by water flow bonding (S6). The nonwoven fabric thus prepared is finally finished with a high density scrim nonwoven fabric through a drying process (S7) (S8). Therefore, no separate calendering process is required.

At this time, the high-pressure water punching process (2.5-200 bar) causes the physical shocks between components A and B to be transferred to different pressures six times, and under the initial water flow pressure, fine cracks between components A and B are obtained. Due to this partially generated continuous water pressure, microcracks can crack, resulting in partial splitting between polymers, resulting in 20-30% splitting per fiber.

In particular, the tensile strength ratio of MD / CD of the manufactured nonwoven fabric should be in the range of 0.8 to 0.9, and it is important that the tensile strength ratio after suede fabrication is 0.9 to 1.1.

At this time, the machine direction (MD) represents the machine traveling direction, and the cross direction (CD) represents the transverse direction to the traveling direction.

Referring to Figure 3 in more detail, the sheet and the scrim on the web is pressed together and then wetted with water of low pressure during the pre-wetting (P ₀ ) step. Subsequently, water punching is carried out at a substantially high pressure. At this time, water punching is performed in a total of six stages (P _{1 ... 6} ), and each stage may vary in pressure depending on the raw materials used or the properties of the nonwoven fabric required. have. Thus, the cross-sectional structure of the completed nonwoven fabric is shown in the figure. In FIG. 3, N-N ′ represents a nonwoven fabric cross-sectional structure in a nonwoven fabric manufacturing process.

The nonwoven fabric thus prepared is transferred to the suede manufacturing step (B) to undergo a process. First, a pretreatment step of impregnating polyvinyl alcohol (PVA) (S11). Subsequently, the polyurethane is impregnated (S12) through the partitioning process has the advantage of reducing the treatment conditions, that is, the concentration of the treatment liquid and the treatment time in the elution process. After impregnation of the polyurethane is subjected to the solidification and washing step (S13) and to perform the drying step (S14).

Thereafter, the elution step (S15) is carried out, and in particular, the amount of polyurethane coating is 30% during suede manufacturing, and as a dissolution condition, a needle punched nonwoven fabric is usually treated in 3% NaOH solution for 60 minutes. In the case of the nonwoven fabric produced by the process according to the invention, treatment with 3% NaOH solution within 30 minutes shows the same reduction effect.

  After that, the surface treatment process such as the first buffing process (S16), dyeing process (S17), the second buffing process (S18), and the finishing process (S19) is excellent in tensile strength and tear strength, and solvent transfer is excellent. High-quality ultra-fine artificial leather can be obtained (S20).

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the present invention is not limited by the following examples.

<Example 1>

PET / E. S. PET (70/30) composite-spun split short fibers were used to prepare nonwoven fabrics and artificial leather suede prepared according to the method of the present invention. . Tensile and tear strength tests were conducted according to ASTM method.

<Example 2>

PET / E. Tensile and tear strengths of nonwoven artificial leather suede according to the method of the present invention using S. PET (70/30) composite spun split fibers were shown in Table 1. The difference is the application of 30 minutes of treatment time in the dissolution process.

Properties Non-woven suede Example 1 (30 minutes elution) Example 2 (60 minutes elution) Tensile strength (kgf / cm) MD 8.0 7.8 7.6 CD 9.9 8.8 8.3 Tear strength (kgf / cm) MD 7.12 4.04 3.64 CD 6.58 3.75 3.25

In the case of the suede shown in Table 1, the split microfibers constituting the nonwoven fabric are completely divided, and the tensile and tear strengths of the final suede when the weight loss time is 30 minutes are compared according to the dissolution time. It turns out that all of them are superior to the case of 60 minutes treatment.

As described above, the suede artificial leather manufactured according to the present invention partially induces the split microfiber yarn by high pressure water flow in the nonwoven fabric manufacturing process, thereby shortening the dissolution treatment time in the post-process, nonwoven fabric In the manufacturing process, it is possible to omit the calendering process for densification and surface treatment of the nonwoven fabric, thereby simplifying the process.

Claims (4)

In the method of manufacturing non-woven fabric for artificial leather suede by using the finely divided surface (PET / E.S.PET) as a raw material, Carding the microdivided surface to form a web; Preparing a laminated sheet by cross-wrapping the web; Supplying a fabric scrim which is a polyamide fiber to the lower end of the laminated sheet and compressing the fabric scrim; Prewetting the composite structure of the sheet and fabric scrim with low pressure water; Water punching the composite structure several times with high pressure water after the prewetting; And Drying and winding the finished nonwoven fabric; high density scrim composite nonwoven fabric and artificial leather suede manufacturing method comprising a. The method of claim 1, High density scrim composite nonwoven fabric and artificial leather suede manufacturing method, characterized in that the tensile strength ratio of MD / CD of the nonwoven fabric is 0.8 ~ 0.9. The method of claim 1, The weight of the scrim is 50 ~ 70g / m ² , the density of the scrim is a high density scrim composite nonwoven fabric and artificial leather suede manufacturing method, characterized in that 40 × 34 pattern / inch. The method of claim 1, The high-pressure scrim composite nonwoven fabric and artificial leather suede manufacturing method characterized in that the pressure in the water punching step is 2.5 ~ 200bar.

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