Bag fabric using high-density polyethylene sheet and polyurethane sheet, and manufacturing method therefor

Abstract

The present invention relates to manufacturing of a bag fabric and, more specifically, to a bag fabric using a high-density polyethylene (HDPE) sheet and a polyurethane sheet, and a manufacturing method therefor, the bag fabric being manufactured by laminating a HDPE sheet and a polyurethane film such that color reproducibility, color durability and surface strength of the fabric can be improved. To this end, the method comprises the steps of: preparing a colored polyurethane resin composition; fixing a release paper to a roller; applying the colored polyurethane resin composition onto the fixed release paper; drying and curing an applied polyurethane resin thin film; forming an adhesive layer on the cured polyurethane film; laminating a HDPE sheet onto the adhesive layer; and aging the laminated fabric.

Description

Bag fabric using high-density polyethylene sheets and polyurethane sheets and method of manufacturing the same

[0001] The present invention relates to the manufacture of a fabric for bags, and more specifically, to a fabric for bags utilizing a high-density polyethylene sheet and a polyurethane sheet, and a method for manufacturing the same, wherein the fabric for bags is manufactured by laminating a high-density polyethylene sheet and a polyurethane film, and the color reproducibility, color durability, and surface strength of the fabric can be improved.

[0002] Polyethylene fabric is a thermoplastic polymer made with a crystal structure different from petroleum-based plastics, and it is the most widely used plastic today. Polyethylene is an olefin fiber, a synthetic fiber made from polyolefins similar to polypropylene; there are many types of polyethylene, and different applications utilize low-density or high-density polyethylene fabrics. This polyethylene is generally used primarily in industries such as fabrics, clothing, and fashion accessories like bags and shoes, and is also widely used in home textiles, furniture, and industrial materials.

[0003] Among them, high-density polyethylene (HDPE) has a density of 0.941 g / cm³ 3 In summary, it has the advantage of having a low branching degree and excellent processability, as well as excellent tensile strength and durability.

[0004] Meanwhile, fabrics used in bags, shoes, sportswear, or functional clothing require high durability to ensure long-term use and enhanced tensile and tear strength, while also ensuring lightness and breathability to improve usability. Furthermore, to satisfy diverse consumer needs, the fabric must be able to incorporate colors and patterns to secure aesthetic appeal.

[0005] Accordingly, the applicant has developed a fabric manufacturing process by combining a high-density polyethylene (HDPE) component with a polyurethane resin, which is used as a fabric for bags, shoes, sportswear, or functional clothing, capable of satisfying basic physical properties compared to conventional technology while simultaneously securing functionalities such as breathability, moisture permeability, and aesthetics.

[0006] Meanwhile, the aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot necessarily be considered publicly known technology disclosed to the general public prior to the filing of the present invention.

[0007] The present invention aims to solve the aforementioned problems. The objective of the present invention is to provide a bag fabric utilizing a high-density polyethylene (HDPE) sheet and a polyurethane sheet, and a method for manufacturing the same, wherein, when manufacturing a bag fabric by laminating a high-density polyethylene (HDPE) sheet and a polyurethane film, basic physical properties such as surface strength, tensile strength, tear strength, and high durability are satisfied, while functionality such as breathability and moisture permeability is secured, and furthermore, the color reproducibility and color durability of the fabric are improved to enhance aesthetics and provide satisfaction to consumers.

[0008] The above and other objects and advantages of the present invention will become apparent from the following description describing preferred embodiments.

[0009] The above objective comprises the steps of: preparing a color polyurethane resin composition; fixing a release paper to a roller; applying the color polyurethane resin composition onto the fixed release paper; drying and curing the applied polyurethane resin film; and forming an adhesive layer on the cured polyurethane film.

[0010] This can be achieved by a method for manufacturing a bag fabric comprising the steps of: laminating a high-density polyethylene (HDPE) sheet onto the adhesive layer; and aging the laminated fabric.

[0011] The above-described color polyurethane resin composition is characterized by comprising 55 to 65 parts by weight of a solvent and 30 to 40 parts by weight of a pigment, based on 100 parts by weight of polyurethane (PU) resin.

[0012] The step of preparing the above-mentioned color polyurethane resin composition further comprises the step of performing aging at 18 to 26°C for 0.5 to 3 days.

[0013] In the step of applying the color polyurethane resin composition onto the release liner, it is characterized by being applied with a thickness of 0.01 to 0.5 mm.

[0014] The step of aging the laminated fabric is characterized by being performed at 80 to 90°C for 48 hours or more.

[0015] The above objective can be achieved by a bag fabric comprising: a colored polyurethane resin film; an adhesive layer formed on one side of the colored polyurethane resin film; and a high-density polyethylene (HDPE) sheet formed on the adhesive layer.

[0016] The thickness ratio of the high-density polyethylene (HDPE) sheet, adhesive layer, and color polyurethane film is characterized by being formed as 1 : 0.01 to 0.1 : 0.1 to 0.25.

[0017] The above-described color polyurethane resin film is characterized by being manufactured using a color polyurethane resin composition comprising 55 to 65 parts by weight of a solvent and 30 to 40 parts by weight of a pigment, based on 100 parts by weight of polyurethane (PU) resin.

[0018] According to the present invention, by laminating a high-density polyethylene (HDPE) sheet and a polyurethane film, it is possible to manufacture a fabric for bags that satisfies basic physical properties such as tensile strength, tear strength, and high durability, while also securing functional properties such as breathability and moisture permeability, and furthermore, improves the color reproducibility and color durability of the fabric to enhance aesthetics and provide satisfaction to consumers.

[0019] However, the effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0020] FIG. 1 is a flowchart showing the steps of a method for manufacturing a bag fabric according to one embodiment of the present invention.

[0021] Figure 2 is an actual photograph showing a polyurethane resin composition according to one embodiment of the present invention.

[0022] Figure 3 is an actual photograph showing the step of manufacturing a polyurethane resin composition in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0023] Figure 4 is an actual photograph showing the release liner preparation step in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0024] Figure 5 is an actual photograph showing the step of applying a polyurethane resin composition to a release liner in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0025] Figure 6 is an actual photograph showing the curing step of drying the applied polyurethane resin composition in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0026] Figure 7 is an actual photograph showing the step of applying an adhesive to a cured polyurethane film in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0027] FIG. 8 is an actual photograph showing the step of laminating a high-density polyethylene (HDPE) sheet to a polyurethane film in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0028] FIG. 9 is an actual photograph showing the step of aging the fabric in a method for manufacturing a bag fabric according to one embodiment of the present invention.

[0029] FIGS. 10 to 15 are actual photographs showing a bag manufactured using a bag fabric according to one embodiment of the present invention.

[0030] The present invention will be described in detail below with reference to the embodiments and drawings. These embodiments are presented merely as examples to explain the invention more specifically, and it will be obvious to those skilled in the art that the scope of the invention is not limited by these embodiments.

[0031] Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains, and in the event of a conflict, the description in this specification, including the definitions, shall prevail.

[0032] To clearly explain the proposed invention in the drawings, parts unrelated to the description have been omitted, and similar parts throughout the specification have been given similar reference numerals. Furthermore, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, the term "part" as described in the specification refers to a single unit or block that performs a specific function.

[0033] In each step, identification codes (1st, 2nd, etc.) are used for convenience of explanation and do not describe the order of the steps; the steps may be performed differently from the specified order unless a specific order is clearly indicated in the context. That is, the steps may be performed in the same order as specified, substantially simultaneously, or in the reverse order.

[0034]

[0035] FIG. 1 is a flowchart showing the steps of a method for manufacturing a bag fabric according to one embodiment of the present invention.

[0036] Referring to FIG. 1, the method for manufacturing a fabric for a bag comprises the steps of: preparing a color polyurethane resin composition (S10); fixing a release paper to a roller (S20); applying the color polyurethane resin composition onto the fixed release paper (S30); drying and curing the applied polyurethane resin film (S40); forming an adhesive layer on the cured polyurethane film (S50); laminating a high-density polyethylene (HDPE) sheet onto the adhesive layer (S60); and aging the laminated fabric (S70).

[0037]

[0038] FIG. 2 is an actual photograph showing a polyurethane resin composition according to one embodiment of the present invention, and FIG. 3 is an actual photograph showing the manufacturing steps of a polyurethane resin composition.

[0039] Referring to FIGS. 2 and FIGS. 3, in step S10, the color polyurethane resin composition may include a polyurethane (PU) resin, a solvent, and a pigment.

[0040] The above-mentioned polyurethane (PU) resin is a polymer material obtained from petrochemical products such as polyethylene, polystyrene, and polypropylene. Because it is harmless to the human body and possesses excellent elasticity and strength, it is widely used in construction materials, packaging materials, and household items.

[0041] The above solvent may include, for example, dimethylformamide (DMF), methyl ethyl ketone (MEK), toluene, etc., but is not limited thereto.

[0042] For example, the above solvent may be methyl ethyl ketone (MEK).

[0043] As long as the above pigment can be combined with the above polyurethane resin to impart various colors, there are no significant limitations on the type of product and color. In addition, by using a combination of two or more pigments, a wide variety of desired colors can be realized.

[0044] With respect to 100 parts by weight of the above polyurethane (PU) resin, the solvent may be included in an amount of 55 to 65 parts by weight, specifically 60 parts by weight, and the pigment may be included in an amount of 30 to 40 parts by weight, for example, 35 parts by weight.

[0045]

[0046] The above composition may further include additives to enable the pigment color to be expressed more vividly and to improve dye fastness, light fastness, and color durability, while simultaneously increasing surface strength, tensile strength, and tear strength.

[0047] It is preferable that the additive be included in an amount of 5 to 10 parts by weight per 100 parts by weight of the polyurethane (PU) resin.

[0048] The above additives are, for example, 1,1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide (CAS No. 85095-61-0), 1,3,5-tris(4-t-butyl-3-hydroxy-3,6-dimethylbenzyl), 1,3,5-triazine-2,4,6-(1H,3H,5H)trione, triethylene glycol-bis-3-(3-tert-butyl-4-hydroxy-5-methyl-phenyl)propionate (CAS No. 36443-68-2), 2-(2'-hydroxy-3',5'-di-tert-butyl-phenyl)-5-chloro-benzotriazole (CAS No. 3864-99-1), It may include one or more selected from 2-(2-hydroxy-3,5,-di-tert-amyl-phenyl)benzotriazole (CAS No. 25973-55-1), locust bean gum, chestnut peel extract, Sophora japonica extract, sea slugs extract, pretreated colored clay, kaolin, and wollastonite.

[0049] The above-mentioned pretreated color clay may have an oil coating applied to the surface of the color clay.

[0050] Preferably, the additive may be a mixture of 1,1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide, locust bean gum, chestnut peel extract, Sophora japonica extract, sea slugs extract, pretreated colored clay, kaolin, and wollastonite in a weight ratio of 1 : 0.6~0.8 : 0.3~0.4 : 0.3~0.4 : 0.35~0.45 : 0.63 : 0.3 : 0.2~0.3.

[0051] An additive having the aforementioned component composition and mixing ratio can significantly enhance physical properties such as lightfastness, color durability, and surface strength of the final fabric by exhibiting oxidation resistance and stability against ultraviolet rays, NOx, and heat.

[0052]

[0053] The above-mentioned color polyurethane resin composition can be manufactured by mixing the aforementioned components and amounts and performing stirring using a conventional device.

[0054] When the above-mentioned color polyurethane resin composition is manufactured by blending the aforementioned component composition and content, the viscosity that may be increased by the polyurethane and pigment can be appropriately reduced by a solvent, i.e., a diluent, thereby increasing coating efficiency, and furthermore, color reproducibility and color durability can be enhanced to produce a more vivid and colorful visual effect.

[0055] After preparing the above-mentioned color polyurethane resin composition, aging can be performed. The aging can be performed, for example, at 18 to 26°C for 0.5 to 3 days, specifically for 1 to 2 days.

[0056] When the above aging is performed, the color reproducibility and color durability exhibited by the color polyurethane resin composition can be further enhanced.

[0057]

[0058] Figure 4 is an actual photograph showing the release liner preparation step in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0059] Referring to Fig. 4, in step S20, the release paper can be fixed to the roller.

[0060] The above-mentioned release liner is designed to be produced in the form of a film or sheet by applying a resin composition to its surface, and there are no significant limitations on its type as long as it is used in a conventional fiber laminating process.

[0061] Specifically, the above-mentioned release liner is a material such as paper, such as kraft paper or white paper, or a film, on which a release agent such as silicone is coated on one or both sides, and can be peeled off and removed after performing the laminating process. In particular, for a release liner used in a fiber laminating process, it is desirable to use one that has excellent heat resistance, durability, solvent resistance, anti-curling properties, surface gloss, and product uniformity.

[0062] In some cases, the release liner may have various forms of intaglio or embossed patterns engraved on its surface, for example, to form surface patterns or designs on the finished fabric product to be produced later.

[0063] The above release liner can determine the size of the fabric to be finally formed, for example, the width can be formed to be 500 to 2,000 mm and the length to be 500 m to 2,500 m, but is not limited thereto.

[0064] The above-mentioned release paper may be fixed to a conventional fabric manufacturing device equipped with, for example, a roller-type release paper roll. The structure of the release paper roll used and the device including it is not particularly limited and may follow known technology.

[0065]

[0066] Figure 5 is an actual photograph showing the step of applying a polyurethane resin composition to a release liner in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0067] Referring to FIG. 5, in step S30, the color polyurethane resin composition can be applied onto a fixed release liner.

[0068] The above method of application is performed according to conventional known techniques, but it is preferable to apply it very thinly with a uniform thickness range of, for example, 0.01 to 0.5 mm, specifically 0.05 to 0.13 mm.

[0069] When the color polyurethane resin composition is applied within the aforementioned thickness range, it may help improve the color reproducibility and color durability of the fabric to be finally formed.

[0070]

[0071] Figure 6 is an actual photograph showing the curing step of drying the applied polyurethane resin composition in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0072] Referring to FIG. 6, in step S40, the applied polyurethane resin film can be dried and cured.

[0073] By the above drying process, the solvent evaporates and is blown away, and the pigment component is evenly blended into the polyurethane, thereby enabling the production of a polyurethane film with a realized color.

[0074] The above drying can be performed using a drying chamber having an appropriate temperature range. It is preferable to maintain the temperature of the drying chamber at, for example, 120 to 145°C, specifically 140°C.

[0075]

[0076] Figure 7 is an actual photograph showing the step of applying an adhesive to a cured polyurethane film in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0077] Referring to FIG. 7, in step S50, an adhesive layer can be formed by applying an adhesive onto a cured polyurethane film.

[0078] The adhesive layer above may be for laminating the polyurethane film and the high-density polyethylene sheet to be described later.

[0079] The adhesive may use known components used in conventional fiber laminating processes. For example, the adhesive may include components such as polypropylene chloride, polycarbonate diol, 3-methyl-1,5-pentanediol, 4,4'-Diphenylmethane diisocyanate, and 1,4-butanediol, or may use a bond, but is not limited thereto.

[0080] After applying the adhesive to the polyurethane film, drying may be performed at a temperature of, for example, 85 to 110°C, specifically 90 to 95°C. The drying may be intended to make the adhesive layer sticky.

[0081]

[0082] FIG. 8 is an actual photograph showing the step of laminating a high-density polyethylene (HDPE) sheet to a polyurethane film in a method for manufacturing a fabric for a bag according to one embodiment of the present invention.

[0083] Referring to FIG. 8, in step S60, a high-density polyethylene (HDPE) sheet can be laminated onto the adhesive layer.

[0084] The above high-density polyethylene (HDPE) sheet can specifically be Tyvek (trade name).

[0085] Tyvek is a fabric widely used as a construction and industrial material due to its strong durability and eco-friendly characteristics, and is also widely utilized in art pieces and fashion items such as bags and shoes.

[0086] Tyvek is composed of a unique porous structure that provides waterproofing while offering excellent moisture permeability, making it particularly suitable for use as a material for sports and outdoor fashion. In addition, while it possesses advantages such as being lightweight, having excellent strength, elasticity, and a pleasant feel, it has the disadvantage of being susceptible to heat, resulting in poor color reproduction and durability for desired colors.

[0087] Accordingly, in the present invention, by manufacturing a fabric by laminating the high-density polyethylene (HDPE) sheet, i.e., Tyvek, with the polyurethane film, it is possible to satisfy basic physical properties such as surface strength, tensile strength, tear strength, and high durability, while also securing functionalities such as breathability and moisture permeability, and furthermore, the color reproducibility and color durability of the fabric can be improved.

[0088] The above lamination method is not particularly limited and may follow known techniques. For example, the adhesion strength can be further increased by rolling the high-density polyethylene (HDPE) sheet bonded onto the adhesive layer.

[0089] For example, the thickness ratio of the high-density polyethylene (HDPE) sheet, the adhesive layer, and the (color) polyurethane film is preferably formed to be 1:0.01 to 0.1:0.1 to 0.25. If the ratio falls outside the aforementioned range, there is a risk that color reproducibility, color durability, or surface strength may be reduced.

[0090]

[0091] FIG. 9 is an actual photograph showing the step of aging the fabric in a method for manufacturing a bag fabric according to one embodiment of the present invention.

[0092] Referring to FIG. 9, in step S70, the laminated fabric can be aged. By performing the aging, the high-density polyethylene (HDPE) sheet and the polyurethane film can be completely integrated to manufacture the fabric.

[0093] The above aging is preferably carried out, for example, at 80 to 90°C for 48 hours or more. The above aging may be carried out once or two or more times under the same conditions.

[0094] After the curing is complete, the release liner can be separated to obtain the rolled fabric. The obtained fabric can be divided into portions of, for example, 100 y and packed.

[0095]

[0096] A fabric can be manufactured by including the aforementioned steps. The fabric may comprise a laminated structure comprising: a colored polyurethane resin film; an adhesive layer formed on one side of the colored polyurethane resin film; and a high-density polyethylene (HDPE) sheet formed on the adhesive layer.

[0097] The above fabric can be used in various fields, such as, for example, textiles or fabrics, bags, clothing, fashion accessories, interior accessories, home textiles, furniture, and industrial materials. For example, it is preferable that the above fabric be used as a bag fabric for manufacturing bags.

[0098] In addition to the descriptions above, the method of manufacturing a bag using the above-mentioned bag fabric may further include known technologies commonly used in the field, or the known technologies may be applied by modifying the design as much as possible.

[0099]

[0100] FIGS. 10 to 15 are actual photographs showing a bag manufactured using a bag fabric according to one embodiment of the present invention.

[0101] Referring to FIGS. 10 to 15, it was confirmed that a bag manufactured using a bag fabric according to one embodiment of the present invention can provide excellent aesthetic appeal by enabling colorful color expression and clearly displaying color intensity.

[0102]

[0103] Hereinafter, the structure of the present invention and the resulting effects are to be explained in more detail through specific embodiments and comparative examples. However, these embodiments are intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

[0104]

[0105] [Example 1]

[0106] A color polyurethane resin composition was prepared by mixing 100 parts by weight of polyurethane (PU) resin, 60 parts by weight of methyl ethyl ketone (MEK), 35 parts by weight of pigment, and 7.5 parts by weight of additive. At this time, the additive is a mixture of 1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide, locust bean gum, chestnut peel extract, Sophora japonica extract, sea slugs extract, pretreated color clay, kaolin, and wollastonite in a weight ratio of 1:0.7:0.35:0.35:0.40:0.63:0.3:0.25.

[0107] After aging at 24°C for 2 days, a polyurethane film was prepared by applying it to a thickness of 0.05–0.13 mm onto a release liner roll equipped with a release liner and drying it at 140°C. Then, an adhesive was applied onto the polyurethane film, followed by drying at a temperature of 90–95°C. Subsequently, a high-density polyethylene (HDPE) sheet (Tyvek) was laminated onto the adhesive layer and aged at 85°C for at least 48 hours to produce a fabric. At this time, the fabric was prepared with a thickness ratio of 1:0.05:0.2 for the high-density polyethylene (HDPE) sheet, the adhesive layer, and the polyurethane film.

[0108]

[0109] [Example 2]

[0110] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0111] In the manufacturing step of the color polyurethane resin composition, 100 parts by weight of polyurethane (PU) resin, 50 parts by weight of methyl ethyl ketone (MEK), 40 parts by weight of pigment, and 7.5 parts by weight of additives were mixed.

[0112]

[0113] [Example 3]

[0114] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0115] In the manufacturing step, the color polyurethane resin composition was mixed with 8.5 parts by weight of additives.

[0116]

[0117] [Example 4]

[0118] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0119] The colored polyurethane resin composition did not include additives during the manufacturing process.

[0120]

[0121] [Example 5]

[0122] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0123] In the manufacturing step of the colored polyurethane resin composition, only 1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide was used as an additive.

[0124]

[0125] [Example 6]

[0126] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0127] In the step of manufacturing the color polyurethane resin composition, a mixture of 1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide, locust bean gum, pretreated color clay, kaolin, and wollastonite was used as an additive in a weight ratio of 1:0.7:0.63:0.3:0.25.

[0128]

[0129] [Example 7]

[0130] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0131] In the step of manufacturing a color polyurethane resin composition, a mixture of 1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide, locust bean gum, chestnut peel extract, Sophora japonica extract, sea slugs extract, pretreated color clay, kaolin, and wollastonite was used as additives in a weight ratio of 1:0.8:0.3:0.4:0.35:0.63:0.3:0.25.

[0132]

[0133] [Example 8]

[0134] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0135] The thickness ratio of the high-density polyethylene (HDPE) sheet, adhesive layer, and polyurethane film in the fabric was manufactured to be 1:0.4:0.1.

[0136]

[0137] [Example 9]

[0138] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0139] In the step of laminating a high-density polyethylene (HDPE) sheet (Tyvek) onto an adhesive layer and aging it, the aging was performed at 90°C for 12 hours.

[0140]

[0141] [Comparative Example 1]

[0142] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0143] The fabric was produced using only a polyurethane film without performing the process of laminating a high-density polyethylene (HDPE) sheet (Tyvek).

[0144]

[0145] [Comparative Example 2]

[0146] Except for the details described below, the fabric was manufactured in the same manner as Example 1 described above.

[0147] The fabric was manufactured using a conventional high-strength polyethylene (HTPE) sheet instead of a high-density polyethylene (HDPE) sheet (Tyvek).

[0148]

[0149] <Experimental Example 1: Analysis of Color Characteristics>

[0150] For each fabric prepared according to the aforementioned Examples 1 to 9 and Comparative Examples 1 and 2, color reproducibility and lightfastness were measured respectively according to known techniques.

[0151] Color reproducibility was evaluated visually based on color uniformity—specifically, whether dyeing is uniform between the center and edges of the fabric, whether color differences occur, and items such as color intensity and vividness—and was expressed on a 5-point scale (1 point: very poor, 2 points: poor, 3 points: average, 4 points: good, 5 points: very good). Lightfastness was measured according to the test method of KSK ISO 105-B02 (2005; Xenon arc method). The evaluation results are shown in Table 1 below.

[0152] Color Reproducibility Lightfastness Example 157 Grade Example 24.86 Grade Example 34.86 Grade Example 44.05 Grade Example 54.15 Grade Example 64.46 Grade Example 74.76 Grade Example 84.56 Grade Example 94.76 Comparative Example 12.82 Grade Comparative Example 23.03

[0153]

[0154] Referring to Table 1, it was found that the embodiments of the present invention exhibited excellent color reproducibility and excellent lightfastness, with superior clarity and uniformity of the fabric color compared to the comparative examples. Among them, the color quality of the fabric in Example 1 was found to be the best.

[0155]

[0156] <Experimental Example 2: Evaluation of Physical Properties>

[0157] For each fabric prepared according to Examples 1 to 9 and Comparative Examples 1 and 2, the tensile strength (N / 50mm) and tear strength (N) were evaluated according to known techniques. The results are shown in Table 2 below.

[0158] Classification Tensile Strength (N / 50mm) Tear Strength (N) Example 1 1370 106.3 Example 2 128 598.4 Example 3 122 095.7 Example 4 100 390.2 Example 5 115 694.3 Example 6 122 595.2 Example 7 128 096.4 Example 8 114 694.0 Example 9 125 496.0 Comparative Example 186 576.1 Comparative Example 295 480.7

[0159]

[0160] As shown in Table 2 above, the fabrics manufactured according to the embodiments of the present invention received an overall superior evaluation in all items regarding tensile strength and tear strength compared to the comparative examples. In particular, the fabric of Example 1 recorded the highest score in the physical property evaluation.

[0161]

[0162] In this specification, only a few examples among the various embodiments performed by the inventors are described; however, the technical concept of the present invention is not limited or restricted thereto, and it is obvious that it can be modified and implemented in various ways by those skilled in the art.

[0163]

[0164] The embodiments disclosed herein relate to a fabric for bags utilizing high-density polyethylene sheets and polyurethane sheets, and a method for manufacturing the same, and have high industrial applicability.

Claims

1. A step of preparing a color polyurethane resin composition; Step of securing the release paper to the roller; A step of applying the color polyurethane resin composition onto a fixed release liner; A step of drying and curing the applied polyurethane resin film; A step of forming an adhesive layer on a cured polyurethane film; A step of laminating a high-density polyethylene (HDPE) sheet onto the adhesive layer; and A method for manufacturing bag fabric comprising the step of aging the laminated fabric.

2. In Paragraph 1, The above-mentioned color polyurethane resin composition is, A method for manufacturing a fabric for bags, characterized by comprising 55 to 65 parts by weight of a solvent and 30 to 40 parts by weight of a pigment per 100 parts by weight of polyurethane (PU) resin.

3. In Paragraph 1, A method for manufacturing a bag fabric, characterized by further including, in the step of manufacturing the above-mentioned color polyurethane resin composition, a step of aging at 18 to 26°C for 0.5 to 3 days.

4. In Paragraph 1, A method for manufacturing a bag fabric, characterized in that, in the step of applying the color polyurethane resin composition onto the release liner, it is applied with a thickness of 0.01 to 0.5 mm.

5. In Paragraph 1, A method for manufacturing a bag fabric, characterized in that the step of aging the laminated fabric is performed at 80 to 90°C for 48 hours or more.

6. Colored polyurethane resin film; An adhesive layer formed on one side of the above-mentioned color polyurethane resin film; and A high-density polyethylene (HDPE) sheet formed on the adhesive layer; a fabric for a bag comprising.

7. In Paragraph 6, A fabric for a bag, characterized in that the thickness ratio of the high-density polyethylene (HDPE) sheet, the adhesive layer, and the color polyurethane film is formed as 1 : 0.01 to 0.1 : 0.1 to 0.

25.

8. In Paragraph 6, A fabric for bags, characterized in that the above-mentioned color polyurethane resin film is manufactured using a color polyurethane resin composition comprising 55 to 65 parts by weight of a solvent and 30 to 40 parts by weight of a pigment per 100 parts by weight of polyurethane (PU) resin.

Images