KR-102960303-B1 - Functional fabric bags that are used in the production method of manufacture

KR102960303B1KR 102960303 B1KR102960303 B1KR 102960303B1KR-102960303-B1

Abstract

The present invention relates to a method for manufacturing a functional fabric for making bags, wherein the composition comprises: a basic fabric preparation step (S10) of preparing a woven basic fabric by winding it onto a roll; an extrusion raw material preparation step (S20) of preparing an extrusion raw material including polyethylene (PE); a conveying step (S30) of conveying the basic fabric wound onto the roll forward; and a moisture-permeable thin film formation step (S40) of extruding a molten extrusion raw material through a T-die onto the upper surface of the conveyed basic fabric to form a moisture-permeable thin film on the upper surface of the basic fabric. The above moisture-permeable thin film forming step (S40) comprises a first process (S41) of extruding molten extruded raw material from the T-die through a first discharge port to form a molten layer on the upper surface of the base fabric, and a second process (S42) of discharging molten extruded raw material from the T-die through a second discharge port before the molten layer formed on the upper surface of the base fabric hardens, and then cooling the discharged extruded raw material to form a film-shaped uniform film, which is then laminated and bonded to the upper surface of the molten layer to form a moisture-permeable thin film composed of the molten layer and the uniform film on the upper surface of the base fabric. By extruding molten extruded raw material onto the upper surface of the base fabric through the first discharge port of the T-die to form a molten layer, and then immediately cooling and curing the molten extruded raw material through the second discharge port of the T-die to form a uniform film with a flat surface, and bonding the uniform film to the upper surface of the molten layer, a moisture-permeable thin film composed of a molten layer and a uniform film is formed on the base fabric. This not only ensures that the surface of the moisture-permeable thin film formed on the base fabric is formed very evenly overall, thereby inducing the quality of the finished functional fabric to be uniform overall, but also, since the moisture-permeable thin film is naturally formed into two layers consisting of a molten layer and a uniform film, it is possible to secure superior physical properties compared to a moisture-permeable thin film of the same thickness produced by the conventional method of manufacturing functional fabrics, thus having the effect of improving the quality of the finished functional fabric. In addition, by spraying high-temperature hot air onto the molten layer formed on the base fabric through the hot air nozzle of the T-dye, the air pressure induces flattening of the molten layer, thereby ensuring that the quality of the moisture-permeable thin film, composed of the molten layer and the uniform film, is formed more uniformly overall. At the same time, the high-temperature hot air prevents rapid hardening of the molten layer, thereby inducing a strong bond between the molten layer and the uniform film, which has the effect of further improving the quality of the finished functional fabric.

Inventors

안교석

Assignees

주식회사원림

Dates

Publication Date: 20260508
Application Date: 20240417

Claims (4)

A manufacturing method for producing a functional fabric for making bags, comprising: a basic fabric preparation step (S10) of preparing a woven basic fabric (10) by winding it onto a roll (1); an extrusion raw material preparation step (S20) of preparing an extrusion raw material including polyethylene (PE); a conveying step (S30) of conveying the basic fabric (10) wound onto the roll (1) forward; and a moisture-permeable thin film forming step (S40) of extruding a molten extrusion raw material through a T-die onto the upper surface of the conveyed basic fabric (10) to form a moisture-permeable thin film on the upper surface of the basic fabric (10). The above moisture-permeable thin film formation step (S40) is, A first process (S41) of extruding the molten extrusion material from the above T-die (200) through the first discharge port (210) to form a molten layer (21) on the upper surface of the above base fabric (10), and A method for manufacturing a functional fabric for making bags, characterized by including a second process (S42) of discharging the extruded raw material melted in the T-die (200) through the second discharge port (220) before the molten layer (21) formed on the upper surface of the base fabric (10) hardens, and then laminating and bonding a film-shaped uniform film (22) formed by cooling the discharged extruded raw material onto the upper surface of the molten layer (21) to form a moisture-permeable thin film (20) composed of the molten layer (21) and the uniform film (22) on the upper surface of the base fabric (10).
In Article 1, A method for manufacturing a functional fabric for making bags, characterized in that the above moisture-permeable thin film forming step (S40) further comprises a third step (S43) in which hot air at a temperature of 200 to 300°C is sprayed from the upper surface of the molten layer (21) extruded to the upper surface of the base fabric in the first step (S41) to flatten the surface of the molten layer (21) so that it becomes flat overall, while simultaneously preventing the hardening of the molten layer (21).
In Article 2, The above base fabric (10) is received and transported from a silicone roller (3), and In the first process (S41) above, the first discharge port (210) located at the lower part of the T-die (200) is located at the upper center portion of the silicone roller (3) so that the molten extrusion material is extruded onto the upper surface of the base fabric (10) supported by the silicone roller (3) to form the molten layer (21). In the second process (S42) above, the second discharge port (220) of the T-die (200) is positioned above the silicone roller (3) so that the uniform film (22) is discharged onto the upper surface of the base fabric (10) which is conveyed downwardly inclined by the silicone roller (3), and below the second discharge port (220) there is a cooling member (230) that provides cold air so that the extruded raw material melted and extruded through the second discharge port (220) can be immediately cooled, and at least one inclined roller (240) is formed to guide the uniform film (22), which has been cooled and hardened by the cooling member (230), to be bent in a manner similar to the inclination of the base fabric (10) which is conveyed downwardly inclined by the silicone roller (3), so that the uniform film (22) is smoothly bonded to the side of the base fabric (10) which is conveyed by the silicone roller (3). In the above third process (S43), a hot air nozzle (250) is positioned between the first discharge port (210) and the second discharge port (220) in the T-die (200) to spray high-temperature hot air onto the molten layer (21) extruded to the upper surface of the base fabric (10) through the first discharge port (210), A method for manufacturing a functional fabric for making bags, characterized in that the first process (S41) to the third process (S43) are all performed before the above basic fabric (10) exits the above silicone roller (3).
In Article 1 or Article 2, The above extrusion raw material preparation step (S20) is characterized by preparing an extrusion raw material by composing 95 to 97 weight% of polyethylene (PE), 2 to 4 weight% of a slip agent, and 0.1 to 2 weight% of an organic or inorganic filler. A method for manufacturing a functional fabric for making bags.

Description

Method of manufacturing functional fabric bags that are used in the production method of manufacture The present invention relates to a method for manufacturing a functional fabric for making bags, and more specifically, to a method for manufacturing a functional fabric for making bags in which a molten extruded raw material is extruded onto the upper surface of a base fabric through a first discharge port of a T-die to form a molten layer, and then the molten extruded raw material is immediately cooled and hardened through a second discharge port of a T-die to form a uniform film with a flat surface, and the uniform film is bonded to the upper surface of the molten layer to form a moisture-permeable thin film on the base fabric composed of a molten layer and a uniform film. This method ensures that the surface of the moisture-permeable thin film formed on the base fabric is formed very evenly overall, thereby inducing the quality of the finished functional fabric to be uniformly formed overall. Furthermore, since the moisture-permeable thin film is naturally formed into two layers consisting of a molten layer and a uniform film, it is possible to secure superior physical properties compared to a moisture-permeable thin film of the same thickness produced by a conventional method for manufacturing functional fabrics, thereby improving the quality of the finished functional fabric. Generally, the basic materials used for making bags are typically fabrics woven from polyethylene (PE), fabrics woven from polypropylene (PP), and sandwich fabrics laminated with kraft paper and the said polyethylene or polypropylene woven fabrics. In order to produce a functional fabric for a bag having a moisture-permeable function, a pre-made base fabric and a polyethylene film are typically prepared by winding them onto rolls, the base fabric is transported to apply a primer to one side, the base fabric with the primer applied to one side is transported to bond the polyethylene film to one side of the base fabric, and the functional fabric with the polyethylene film bonded to one side of the base fabric is wound onto a winding roll to complete the production of the functional fabric. However, in the case of manufacturing functional fabrics as described above, First, since the above functional fabric is manufactured using a base fabric, an adhesive, and a polyethylene film, there is a problem in that the amount of material required for production is large, resulting in material waste and a high unit cost of the product. Second, since pre-fabricated polyethylene film must be used, there is a problem in that the unit price of the product increases by the amount of cost incurred in producing it in film form, and Third, polyethylene film that performs moisture permeability in functional fabrics is frequently required to be thin (approximately 0.02 to 0.04 mm) depending on the intended use of the bag; however, suitable strength is required to safely store the polyethylene film wound onto a roll, and since the polyethylene film thickness must be formed thick to satisfy this strength, there are problems such as wasted material and increased product unit costs. Fourth, there was a problem where the productivity of the product was reduced due to the complex process of manufacturing functional fabrics. To solve the above-mentioned problems, the applicant has developed and proposed a "method for manufacturing a functional fabric for bag production (Registration No.: 10-1293542)" which simplifies the manufacturing process to secure product productivity while allowing the thickness of a moisture-permeable thin film formed of polyethylene to be freely determined, thereby significantly reducing the unit cost of the product. However, the above "Method for manufacturing functional fabric for making sacks (Registration No.: 10-1293542)" had the following problems. First, when the extruded raw material, melt-extruded through a T-die to form a moisture-permeable film on the base fabric, is discharged onto the surface of the base fabric, the surface of the extruded raw material is easily deformed due to the impact at the moment of contact with the base fabric. Consequently, the surface of the moisture-permeable film formed by the hardening of the extruded raw material is not formed evenly, leading to a problem where the quality of the finished functional fabric is not uniformly formed overall. Furthermore, due to vibrations and shaking generated by the conveyor roller, which is a mechanical device for conveying the base fabric, the surface of the molten extruded raw material discharged onto the base fabric is easily altered, resulting in a problem where the quality of the finished functional fabric is not formed uniformly as described above. Second, since the breathable film formed on the base fabric consists of a single layer, it is somewhat difficult to secure excellent physical properties of the breathable film, which resulted in a problem where