KR101261507B1 - Continuous high-density shrink system and method of manufacturing high-density kntting using non-urethane resin including the same system - Google Patents

Abstract

The present invention provides a continuous high-density shrinkage system comprising the following steps: (iii) a chemical processing unit for impregnating and picking up a knitted fabric into the high shrinkage medicine; (Ii) a retention process unit in which the knitted fabric passing through the chemical process unit stays while shrinking at a high density by the high shrink medicine; And (iii) a washing step for removing the chemicals and fine impurities remaining in the knitted fabric passing through the holding step.
The present invention can overcome the environmental problems considered in the use of urethane because it provides a synthetic leather manufactured in a new direction by removing the method of using the urethane resin in the conventional artificial leather, the tension applied to the fabric by a continuous system By minimizing it more effectively, the knit fabric is shrunk to a higher density, resulting in a closer touch to natural leather.

Description

Continuous High-density Shrink System And Method Of Manufacturing High-density Kntting Using Non-urethane Resin Including The Same System}

The present invention relates to a continuous high-density shrinkage system and a method of manufacturing a high-density knitted fabric comprising the same, and more particularly, to a high-density, high-sensitive knitted fabric and a continuous system capable of manufacturing the same without using a urethane resin will be.

Leather, or leather, has been used for protecting the body from the cold, and sometimes used as a container for storing alcohol and water. Leather has long been used as a high quality material that people prefer because of its durability, breathability, and durability, and can be used for a long time. The raw materials of leather are mainly from animals such as cows, horses, sheep, snakes, crocodiles, etc. However, due to the difficulty of processing, they are expensive, and for reasons such as animal protection and mass production, people artificially substitute materials that can replace natural leather. I have been trying to make it for a long time.

Polyamide resin, which is composed of the same protein as the main ingredient of leather, is an artificial leather product that is hard to obtain such properties as natural leather. It is very difficult to realize the physical properties and feel of natural leather. Because the texture of natural leather is not as uniform as polymer film. Natural leather is composed of epidermal layer and dermis layer. The epidermal layer makes up only about 1% of the thickness of the whole leather, and is mainly composed of protein called keratin. The dermis is composed of a protein called collagen, which crosses longitudinally and crosswise to form a fibrous structure. The upper layer and papillary layer, called the papillary layer, where hair follicles, sweat glands, sebaceous glands, and hair roots are present. It is divided into lower layers called layers. It is this part of the dermis that mainly consists of leather, consisting of dense fibrous tissue. Such a multi-structure is soft and has a high mechanical strength and breathability, but does not pass water well.

People's efforts to resemble the organizational structure of dense natural leather have continued. Manufacture of Synthetic Leather coated with PVC in early stage, Ultraden Fiber of 0.05denier level is made of high density non-woven fabric to form a dense entangled state of the bundle of ultrafine fibers, and elastic resin (between the bundles) Poly Urethane has been developed to fill the technology. This organization of dense and high density can be seen as a decisive technique to reproduce natural leather. Fabric tissue of artificial leather can be composed of the method of all kinds of fabrics, knitted fabrics, nonwoven fabrics, but the higher the fabric density of fabrics, the lower the stretch rate and the inconvenience of cutting. use.

As a conventional technique of making artificial leather using a knitted fabric, there is a Korean Patent Application No. 2001-0034085, 'Method for manufacturing suede artificial leather using microfiber knitted fabric'. The patent is a mixture of the eluted polyester fiber and the single filament fineness of 1 to 10 denier mixed with the multi-spun composite fiber to enable microfiberization to form a bubble in the form of a knitted fabric; Brushed, dyed, impregnated and set in an aqueous polyvinyl alcohol solution; Impregnating, coagulating and drying the polyurethane solution provides artificial leather having properties similar to those of natural leather in terms of flexibility, elasticity, wrinkles, feel and appearance. Another conventional technology is Republic of Korea Patent Application No. 2008- 0034578 'method of manufacturing suede-like artificial leather of the circular circular knitting tissue rich in filling feeling'. The patent is to interlace the high shrink polyester filament yarn to any one of the polyester-based islands and divided composite yarns to interlock or double-layered tissue (CIRCULAR KNIT), to reduce the weight, dyeing, reducing washing, primary It provides an artificial leather manufacturing method characterized by heat treatment, double-sided brushing, second heat treatment, polyurethane impregnation, third heat treatment, double-sided sanding, reduced washing, batch mangung washing and fourth heat treatment.

In addition to this, various artificial leather manufacturing methods exist as patent technologies, but the difference in technology does not exist very much, and it is a limitation that urethane impregnation process is necessarily included in order to make use of the feeling of natural leather. Urethane artificial leather is essentially an organic solvent is used in the manufacturing process, the use of such organic solvents cause environmental problems around the world. In addition, organic solvents are known to be carcinogenic, there is a problem that is harmful to the human body when remaining in the artificial leather, the final product. Therefore, although research is being conducted worldwide on the manufacture of solvent-free polyurethane artificial leather, difficulty in producing a suitable raw material, difficulty in the manufacturing process due to rapid curing of the raw material, product non-uniformity, deterioration of the product compared with conventional artificial leather The situation is not practical because of such problems.

Numerous papers and patent documents are referenced and cited throughout this specification. The disclosures of the cited papers and patent documents are incorporated herein by reference in their entirety to better understand the state of the art to which the present invention pertains and the content of the present invention.

Conventionally, artificial leather is impregnated with a polyurethane resin to realize a feeling and physical properties similar to those of natural leather. However, the use of polyurethane has a variety of problems that can cause environmental problems by the organic solvents used together, and researches around the world on the manufacture of solvent-free polyurethane artificial leather. However, it has not been practically used due to problems such as difficulty in producing a suitable raw material, difficulty in manufacturing process due to rapid curing of raw materials, non-uniformity of the product, and deterioration of the product compared with conventional artificial leather.

Accordingly, the present invention is a method for producing a high-density knitted fabric having a better texture by impregnating a knitted fabric in a high shrinkage solution and shrinking it to a high density so as to have an apparent density of 0.3-0.6 g / cm 3 and then treating the environment-friendly resin. It provides a continuous high density shrinkage system for use. The high-density knitted fabric of the present invention can realize the physical properties and feel of natural leather without using a urethane resin, and the high-density shrinkage of the knitted fabric can be made more efficiently because the tension applied to the fiber can be minimized by the continuous system.

The present invention provides a method for impregnating a knitted fabric into a high shrinkage solution to shrink it densely to have an apparent density of 0.3-0.6 g / cm 3 and a continuous high density shrinkage system used therein.

The present inventors have made extensive efforts to produce an artificial leather having a feeling similar to that of natural leather without using a urethane resin. As a result, the urethane-free knitted fabric having the above-described advantages was completed, and the artificial leather having excellent touch was manufactured without using urethane by impregnating the knitted fabric in a solution containing high shrinkage chemicals and densely contracting. In addition, it was confirmed that the high density shrinkage is more efficiently possible by minimizing the tension on the knitted fabric by the continuous high density shrinkage system.

According to one aspect of the present invention, the present invention provides a continuous high density shrinkage system comprising the following process. A chemical processing unit for picking up and picking up the knitted fabric in the high shrinkage solution; A retention step in which the knitted fabric that has passed through the chemical step stays while shrinking at a high density by the high shrinkage solution; And a washing step for removing residual chemicals and fine impurities of the knitted fabric passing through the holding step.

The term continuous in the present specification means a connected structure in which each process of the high density shrinkage of the present invention can occur without breakage, and in the present invention, the system is continuously configured in order to minimize the tension applied to the fabric. Being can be an important factor for shrinking at high density.

As used herein, the term high shrinkage refers to shrinkage of a knit in a horizontal and longitudinal stretch ratio of 30-50%, and may refer to a process in which the apparent density of the knit fabric is 0.3-0.6 g / cm 3 as a result of the shrinkage. have. In the present invention, it may be important to limit the results of pepper axis in the range of the apparent density 0.3-0.6 g / cm 3. Because the high-density shrink knitted fabric produced through the present invention can be used as artificial leather, because when the apparent density of artificial leather is 4.2 g / ㎠ or more can realize the same touch as natural leather. That is, the goal of high-density shrinkage is to have an apparent density close to 4.2 g / cm 3, so that the apparent density of 0.3-0.6 g / cm 3 as a result of shrinkage can be achieved by achieving the goal of high shrinkage. Is to use the term.

As used herein, the term " bulk density " generally refers to the density of a volume including a space other than an object in an object such as a powder, a granule, and a fibrous material existing in a space other than the object space. The fibers may be limited to a density of the volume including the space other than the fibers on the woven fiber.

The term 'knitting (編 物)' of the present specification is to make a loop in one direction in the weaving method to configure the fabric by the connection, preferably can be the same as the knitted fabric and knit (Knitting) More preferably, it may mean a suede jaw.

As used herein, the term impregnation may refer to the penetration of a gaseous or liquid substance into an object to improve the properties of the object depending on the intended use. Since the relevant field of the present invention is fiber, impregnation in this specification may mean penetrating the drug into the void space of the fiber structure to impart specific properties or properties to the fiber.

According to a preferred embodiment of the present invention, the drug process unit may further include a pre-washer process unit for putting the knitted fabric in the expanded state in the previous step, washing with water without wrinkles and impurities of the knitted fabric. In the present invention, the pre-washer process may be a step of preparing the shrinkage chemicals to be uniformly impregnated in the fabric.

According to a preferred embodiment of the present invention, the chemical processing unit may further include a chemical tank into which the high shrinkage solution is injected and a mangle (pickle) to pick up the fabric impregnated with the high shrinkage solution.

The term " mangle " as used herein means a machine including a roller for squeezing a solution, which may mean that the dyestuff contained in the treatment liquid is used to uniformly press-impregnate the fabric with the dyestuff.

According to a preferred embodiment of the present invention, the pressure of the mangle (mangle) is 0.1-5.0 kgf / ㎠, Pick up rate can be 50-150%, more preferably the pressure is 0.5-4.0 kgf / ㎠ and Pick The up rate may be 90-120%, most preferably the pressure may be 1.0-3.0 kgf / cm 2 and the pick up rate 100-110%. However, the present invention is not limited thereto, and the above conditions can be selected flexibly to shrink the apparent density of the knitted fabric to the range of 0.3-0.6 g / cm3.

According to a preferred embodiment of the present invention, the holding step may be to hold the knitted fabric for 10-50 minutes at a temperature condition of 30-100 ℃ and pressure conditions 1.0-2.5 kgf / ㎠, more preferably temperature conditions 50 It may be for 20-40 minutes at -80 ℃ and pressure conditions 1.5-2.0 kgf / ㎠, and most preferably may be to hold the knitted fabric for 30 minutes at temperature 60 ℃ and pressure 1.8 kgf / ㎠. The knitted fabric may shrink 30-60% as it passes through this retention process. However, the present invention is not limited thereto, and the above conditions can be selected flexibly to shrink the apparent density of the knitted fabric to the range of 0.3-0.6 g / cm3.

According to a preferred embodiment of the present invention, the washing step may include one or more washing tanks in which the ultrasonic device is installed. In the present invention, it may be very important that the ultrasonic apparatus is installed in the washing process unit. This is because all of the chemicals and fine impurities remaining in the highly contracted high density knitted fabric can be removed by ultrasonic washing, and the high density knitted fabric can be used as a high clean cleaner.

According to another aspect of the present invention, the present invention provides a continuous high density shrinkage system and a method for producing a urethane free high density knit fabric comprising the following steps: (a) pretreatment to refine, reduce, and brush the knit step; (b) injecting the pretreated knitted fabric of step (a) into the continuous high density shrinkage system containing a high shrinkage solution to shrink at high density; And (c) impregnating the high-density shrinked knitted fabric of step (b) into an eco-friendly resin.

As used herein, the term scouring may refer to a process of removing impurities, or pastes or emulsions added in spinning, weaving, and knitting processes.

The term weight reduction of the present specification is mainly applied to a polyester fabric, and the surface of the fiber is hydrolyzed by NaOH treatment, and as a result, numerous irregular and fine irregularities are generated on the surface, resulting in a soft touch. It may mean a processing method that becomes excellent. In the present invention, since artificial leather excellent in tactile feel is provided, it may be important that weight reduction processing is included in the pretreatment.

The term napping of the present specification is a processing method of scraping feathers from the surface of a knitted fabric, and may mean a processing method performed to impart a soft texture and visual beauty. In the present specification, it may be important to include brushed processing in the pretreatment process. This is because, if fine napping occurs on the surface through brushed processing, it is possible to realize a feeling of soft natural leather.

According to a preferred embodiment of the present invention, the high shrinkage solution of step (b) comprises at least one selected from the group consisting of benzyl alcohol, dipentene, and benzoic acid as a shrinkage agent And a group including polyethylene glycol, sorbitan monostearate, Turkey red oil, and fatty alcohol sulfate as components other than the shrinking agent. It may further include at least one selected from. However, more preferably, at least two selected from the group containing benzyl alcohol, dipentene, and benzoic acid may be included as a shrinking agent, and most preferably, benzyl alcohol. , Dipentene, and benzoic acid may all be included as shrinking agents. It may be possible to selectively contain benzyl alcohol, dipentene or benzoic acid. However, when it is used in combination with one or more than two selected, It can happen effectively. In addition, the high shrinkage solution may be most preferably included all components other than the shrinkage agent. In particular, when included in all, in a preferred use of each component, the polyethylene glycol may function as a volatile preservative and the sorbitan monostearate may serve as an emulsifier, Alcohol sulfates can function as penetrants. Although at least one of the components other than the above-mentioned water-shrinking agents may be additionally contained in the high-shrinkage solution, when the shrinkage solution is used in accordance with each application, the contraction of the density to be achieved in the present invention more effectively occurs .

According to a preferred embodiment of the present invention, the eco-friendly resin of step (c) is characterized in that the lanolin resin, and may further include casein or collagen as a tactile aid. In the present invention, the lanolin is purified and recovered from the secretion attached to the wool when washing the wool, its characteristics are strong viscous, such as pale yellow or pale yellow fat. Almost odorless, fat-like, soluble in ethyl, chloroform, and petroleum benzine and slightly soluble in alcohol. In addition, when heated in an aqueous phase, it is melted and separated into an oil layer and an aqueous layer, and can be used as a raw material for medicine, cosmetics, emulsions, and shampoos. In the present invention, it may be very important to treat the lanolin resin after finishing. Because lanolin resin is an oil extracted from the original wool, artificial leather treated with lanolin resin can maximize the feeling of natural sheepskin. In addition, it is possible to realize the feel of the sheepskin with only the lanolin resin, but it may also be important to further include casein and collagen in the present invention because it may be much softer and better when the case aid contains casein or collagen.

The description of the continuous high density shrinkage can be generally interpreted by those skilled in the art, and will be omitted in consideration of the overlap and excessive complexity of the description herein.

The features and advantages of the present invention are summarized as follows:

(A) The present invention provides a continuous high-density shrinkage system comprising the following steps: (iii) a chemical processing unit for impregnating and picking up a knitted fabric into the high shrinkage medicine; (Ii) a retention process unit in which the knitted fabric passing through the chemical process unit stays while shrinking at a high density by the high shrink medicine; And (iii) a washing step for removing the chemicals and fine impurities remaining in the knitted fabric passing through the holding step.

(b) The present invention overcomes the environmental problems considered in the use of urethane because artificial leather made in a new direction is provided by removing the urethane resin impregnation method used in artificial leather.

(c) In the present invention, in order to shrink the knitted fabric at a high density, the tension applied to the fabric is minimized, so that the high density shrinkage is made more effectively, so that a closer touch to natural leather can be obtained.

(d) The high shrinkage and high density knitted fabric according to the present invention can be developed as a multifunctional knit suede such as a high clean cleaner having a large surface area, excellent absorbency, wiping property and almost no scratch. And

(e) Suits, jackets, coats, outerwear, casual wear, high fashion and gloves, bags, hats, belts, and various sporting goods shoes based on the excellent elasticity of the high shrink and high density knit fabric according to the present invention. It can be applied to dragon-dress, casual shoes and sports shoes.

1 shows a continuous high density shrinkage system for producing a urethane free high density knit fabric comprised in embodiments of the present invention.
2 is a cross-sectional view of the island-in-the-sea yarn that is a yarn of the present invention.
Figure 3 shows a before and after comparison of the microfiber shrinkage occurring during the weight loss during the pretreatment of the present invention.
Figure 4 shows a comparative picture before and after the knitted fabric of the present invention is shrunk to high density by high shrinkage chemicals.
5 shows a self-development schematic of the eco-friendly resin of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention, and it is to be understood by those skilled in the art that the present invention is not limited thereto It will be obvious.

Example

Example 1 Preparation of Fabric for Leather Backing

(PET), nylon (Nylon), PCP (PET / Co-PET) and the like, which have single yarn fineness of 0.3 to 0.05 denier And a composite yarn may be selected from among the charts and the divisions. In the embodiment of the present invention, PCP 80D (domestic Huvis and 50D PCP of 30% polyester of SHINKONG SYNTHETIC FIBERS CORPORATION, Taiwan) was selected as a yarn, and the single yarn fineness of the split yarn was divided into DPF denier per filament) 0.185D. The selected yarn was woven in an interlocking structure using a circular knitting machine 42G (Maya, Germany) to prepare a fabric for backing leather.

Example 2: Scouring, Reduction and Brushing Process

(SC-700; World Chemical Co., Ltd., BK-500; white light industry), 0.1 to 1.0% (ows) of a scouring agent (d) a dewatering agent (SC-1000; world chemistry, SEQ-T; entecrosoria, oligomer; impurities, anti-redeposition agent SG-45; World Chemical), and 0.5 to 3.0% (ows) Soda (NaOH) (Wonil Chemical Co., Ltd., Daejung Chemical Co.) were mixed and pretreated at 80-100 ° C for about 10 to 40 minutes. At this time, NaOH was added so as to be accompanied with scouring and alkali weight reduction processing, and in the pretreatment step, it was noted that the temperature may be different from the pretreatment agent depending on the microfiber manufacturer, twisting water, texture and weaving condition.

After the scouring and weight reduction, the fabric is put into a bristle machine (NAPPING MACHINE RPM; 500-1,500, times: 4-18 times) to artificially brushed ). Since the brushing process can determine the texture afterwards, the brushing length can be changed depending on the use.

Example 3: Low temperature high density shrinkage process by high density shrinkage chemicals

Work was performed to densely shrink the treated fabric according to Examples 1 and 2. The machine used here is a continuous low-temperature high-density systolic reactor consisting of an inlet, a pre-washer tank, a chemical tank, a holding tank (shrinking and shrinking chambers), a water tank, an ultrasonic water tank, and a plating tank. It is advantageous in that the density is not lowered due to tension or elution, so that it is a device specially selected and manufactured by the present invention. Before the fabric is added, the drug tank of the chemical tank in advance was mixed in the content ratio as shown in Table 1, and diluted to about 10 to 30% by weight of the drug solids relative to water (water).

The fabrics treated in Examples 1 and 2 were placed in a sagging state in an expanded state and washed in a pre-washer bath to prevent creasing. When the fabric was passed through the chemical bath after the washing process, the pressure of the mangle was 2.5 kgf / ㎠ and the drug was allowed to penetrate the fabric at 100% pick up rate. In the holding tank in which the density of the next fabric can be determined, the fabric was held for 30 minutes at a temperature of 60 ° C. and a pressure of 1.8 kgf / cm 2.

Usage ingredient Content (% by weight) Festival Benzyl alcohol 20-80 dipentene 5-30 benzoic acid 5-30 Preservative polyethylene glycol 1-5 Emulsifier sorbitan monostearate 1-5 turkey redoil 3-10 Penetration agent fatty alcohol sulfate 0.1-2 tidecyl 0.1-2 Reforming agent polyglycol diglycidyl ether 0.2-2 Emulsifying neutralizing agent ethylamine 0.2-2 alkyl etherphosphate 0.2-2 Dispersant alkyl benzene sulfonate 0.2-2

Example  4: washing process including ultrasonic washing and Plating

The densely contracted fabric was passed through four residence tanks. Ultrasonic devices were installed in at least one water tank, and fine particles could be removed. Each water tank was connected to a conveyor system so that the tension applied to the fabric could be minimized. After the washing process, the fabric was returned to the plating tank in a fully expanded state.

Example  5: Eco-friendly resin  Produce

In order to give a feeling of natural leather, the knitted fabric shrunk to a high density by the method of Examples 1 to 5, it was necessary to eco-friendly resin treatment. Therefore, eco-friendly resins were prepared, and the method was based on lanolin resin, a wool oil component, and mixed with fatty acid-based collagen resin and casein resin extracted from plants. Was to mix.

More detailed method was as follows.

First, 420 kg of lanolin (Anhui leafchem Co., Ltd.) was sulfated at less than 35 DEG C with 125 kg of 66-degree bo-me sulfuric acid (Great Film). After the sulfation reaction, the resultant was washed with 500 kg of water, and then neutralized with 190 kg of 35 ° Bo-Mega Soda (Wonil Chemical Co., Ltd.) while paying attention to temperature to obtain a water-soluble lanolin resin. Casein resin (Hananam Corp.) and collagen resin (Sammi Industries) were added as tactile aids, and glycerin (space industry) and PEG (polyethylene glycol, space industry) were added for moisturizing effect. Daejin Ewha) was added as a crosslinking agent to complete the eco-friendly resin. More detailed content was as Table 2 below.

medicine Usage Content (% by weight) Lanolin resin Softener-Tactile Agent 40-60 casein Tactile aids 10-15 Collagen Tactile aids 5-10 glycerin Moisturizer 10-15 Polyethylene glycol (PEG) Moisturizer 10-15 Isocyanate Cross-linking agent 5-8 water - 4-8

Example  6: including dyeing and eco-friendly resin treatment Post-processing  fair

As a final step, dyeing and eco-friendly resin treatment were performed to make the surface feel (visual tactile feeling) of high density shrinked fabric similar to artificial leather. Dyeing was performed with acid dye of pH 4-5 at a bath ratio of 1: 10-1: 30. Dyeing conditions were treated for 40-100 minutes at 120-130 ° C and the chemicals used for dyeing are shown in Table 3 below.

medicine Usage content BLACK AMP (Daeyoung Industry) Disperse dye 15% (o.w.f) Baritol (Chemistry World) Penetration agent 1-3% (o.w.s) disper N-3 (Daeyoung Trading) Micro-dispersant 0.1-1% (o.w.s) disper VG-1000 (Daeyoung Trading) Dispersant for leveling agent 0.1-1% (o.w.s) SG-45 (World Chemistry) An anti-redeposition agent 0.5-3% (o.w.s) Acetic acid or citric acid pH regulator 0.5-3% (o.w.s)

In dyeing, acid dyeing generally uses disperse dyes and had to be selected according to the importance of solvent resistance, light fastness and fastness to washing. After dyeing, the unfixed dye was removed by R / C (Reduction Clearing Agent) and washing with water.

Next, finishing and finishing (temper, 150-180 ° C. × 30 m / min) including drying and heat treatment were performed, in which resin processing was performed to give the feel of sheepskin. The eco-friendly resin prepared by the method of Example 5 was processed at a pick-up rate of 80-150%, and then post-treated in the order of padding, dry, and curing.

Experimental Example  1: Physical properties of artificial leather

The physical properties of the artificial leather prepared according to Examples 1 to 5 of the present invention were measured as follows, and the results are shown in Table 4 below.

Density : Weight and thickness were measured in the same size around high density and density was measured according to KS K0521 test standard. When the density is more than 0.4 g / ㎤, it can be expected to have a touch and characteristics similar to those of natural leather. Therefore, it takes a large portion of the quality and has a mechanical limit.

Daylight fastness : To determine the degree of change of color due to sunlight , we measured the weatherability by adjusting artificial light, heat and humidity, and it was measured according to KS K105B02 test standard.

Cutting strength : The force applied when the fabric is ruptured. Three test specimens with a width of 100 mm and a length of 100 mm were measured and measured according to the KS K 0520 test standard using a MULLEN cut strength tester.

Thickness : Measured according to KS K 0506 test standard. Usage varies depending on thickness. For 1.2 or more, CAR-SEAT 0.8 or less is used for automobile interior use. Thinner is used for clothing, and there is a correlation between touch and density.

Air permeability : measured according to MS257-13 test standard. It refers to the degree of air permeability of textile products and it is a test to measure the amount of air passing. The degree of air permeability affects sanitary properties such as warmth, waterproofness, and moisture resistance, and is closely related to comfort.

Fineness (denier): was measured using a microscope and Warp reel.

Splitting ratio : A measure for determining the degree of splitting of split yarn and chart yarn, was measured using an electron microscope. The higher the disintegration rate, the more fine fibers were possible, and the soft touch could be exhibited.

Evaluation item Measures Density (g / cm3) 0.42 Light fastness (grade) 4-5 Cutting strength (kg / 25mm) 60-150 Thickness (mm) 1.2 Air permeability (cm3 / sec) 20 The denier 0.2 Decomposition rate (%) 90

Experimental Example  2: Preference experiment

The sofa sheet was manufactured using the artificial leather manufactured according to the first to fifth embodiments of the present invention, and the feeling and the preference of the users were examined. The comparison subjects were a sheet made of 100% natural leather (control 1) and a synthetic leather made of urethane impregnated (control 2). The participants in this experiment were 50 people in their 20s and 30s, and did not provide any information about the material of the sofa sheets to the participants. After using the sofa sheet, the result of examining the preference by comparing the touch and visual feeling of each leather sheet was as Table 5 below.

Evaluation item Control group 1
(Natural leather) Control 2
(urethane Impregnation  Synthetic Leather) Invention
(Urethane high density synthetic leather) Sensitivity 45 people 14 people 41 people Visual impression 48 people 15 people 37 people

As described above, the urethane-impregnated synthetic leather has a low degree of preference, while the urethane high density synthetic leather of the present invention is as preferable as the natural leather. As a result, it was proved that the present invention can provide a feel and visual feeling close to that of natural leather, which is difficult to distinguish from natural leather.

Claims (9)

In the continuous high density shrinkage system comprising the following process,
A pre-washer process unit for feeding the knitted fabric in the expanded state and washing the input knitted fabric with no wrinkles and impurities;
Impregnating the washed fabric in the high shrink medicine, pick up (Pick up),
The high shrinkage drug includes benzyl alcohol,
Chemical process unit, characterized in that it further comprises dipentene (benzoic acid) or dipentene (benzoic acid) as a component other than the benzyl alcohol;
Retention process unit for retaining the knit fabric for 10-50 minutes at temperature conditions 30-90 ℃ and pressure conditions 1.0-2.5 kgf / ㎠ so that the knitted fabric passed through the chemical process part is shrunk to high density by the high shrinkage chemicals;
A washing step unit provided with a washing tank for removing the remaining chemicals and fine impurities of the knitted fabric passing through the holding step unit; And
Plating process unit for recovering the knitted fabric passing through the water washing process in a expanded state;
Continuous high density shrinkage system comprising a.
delete The method of claim 1,
The chemical processing unit further includes a chemical tank into which a high shrink chemical is added and a mangle to pick up the fabric impregnated with the high shrink chemical,
The pressure of the mangle (mangle) is 0.1-5.0 kgf / ㎠, the continuous high density shrinkage system characterized in that the pick-up rate is 50-150%.
delete The method of claim 1,
In the stay process, the knit fabric is highly shrunk to 30-50%,
The result is a continuous high density shrinkage system, characterized in that the knitted fabric shrinks to have an apparent density of 0.3-0.6 g / cm 3.
The method of claim 1,
The washing process unit includes four or more washing tanks,
The flush tanks are connected to each other by a conveyor system,
And at least one flush tub is provided with an ultrasonic device.
Method for producing a urethane-free high density knitted fabric comprising the following steps;
(a) a pretreatment step of refining, weighting, and raising the knitted fabric;
(b) injecting the pretreated knitted fabric of step (a) into the continuous high density shrinkage system of any one of claims 1 to 6 containing a high shrinkage agent to shrink at high density; And
(c) impregnating the lanolin resin with the densely shrunk fabric of step (b).
The method of claim 7, wherein
The high shrinkage drug of step (b) comprises at least one selected from the group consisting of benzyl alcohol, dipentene, and benzoic acid as a shrinking agent,
Minimum components selected from the group consisting of polyethylene glycol, sorbitan monostearate, Turkey red oil, and Fatty alcohol sulfate as components other than the above shrinkage agent. Method for producing a urethane-free high-density knitted fabric further comprising at least one.
The method of claim 7, wherein
The lanolin resin of step (c) further comprises casein or collagen as a tactile aid.

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