KR200326611Y1 - Artificial leather complex string having good dimensional stability and quality - Google Patents

Abstract

The present invention relates to a synthetic leather composite string having a novel structure with excellent dimensional stability and texture. More specifically, the present invention relates to a strip-shaped synthetic leather material surrounding one or more circular cross-section cores of low elongation and high toughness. By folding both ends inwards with a certain width and bonding the outer surfaces of the folded parts against each other, they are excellent in dimensional stability and capable of producing a variety of aesthetics, and have a large volume and high cushioning properties due to changes in the finishing process applying heat and pressure. Provide a synthetic leather composite strap showing texture.

Description

Synthetic leather composite strap with excellent dimensional stability and texture {ARTIFICIAL LEATHER COMPLEX STRING HAVING GOOD DIMENSIONAL STABILITY AND QUALITY}

The present invention relates to a synthetic leather composite string having a novel structure with excellent dimensional stability and texture. More specifically, the present invention relates to a strip-shaped synthetic leather material surrounding one or more circular cross-section cores of low elongation and high toughness. By folding both ends inwards with a certain width and bonding the outer surfaces of the folded parts against each other, they are excellent in dimensional stability and capable of producing a variety of aesthetics, and have a large volume and high cushioning properties due to changes in the finishing process applying heat and pressure. Provide a synthetic leather composite strap showing texture.

Many items used in real life, such as shoes, clothing, ornaments, etc. are made of a variety of materials, for example, natural materials such as natural fibers, leather, artificial materials such as synthetic fibers, synthetic resins, composite materials such as these Used. In addition, these materials are transformed into various types of structures to manufacture the articles, one of which is a string.

The string itself has various uses, as well as twisting two or more strands together to form a variety of strings having different shapes and shapes, or as shown in FIGS. Iii) weave in various forms with the material 200 to form the band 300, or weave them in the form of a woven fabric may be made in the form of cloth. Straps deformed into these various forms can be used for the band 300 of the sandal 400, for example, as shown in Figures 2a and 2b.

Such a string may be made of a number of fine fiber yarns made of natural fibers such as cotton, hemp, wool, or synthetic fibers such as polyester, nylon, etc., but these may be various types of strings, bands, and woven fabrics. When used for the same use as in Figures 2a and 2b made, etc., there is a problem that the shape stability and aesthetics are inferior and easily stretched. Natural leather straps have been preferred since the past as a material capable of exhibiting such form stability and aesthetics, but they are expensive, difficult to exhibit various colors, and easily contaminated.

In recent years, synthetic resin straps have been developed and used to exhibit the advantages of natural leather straps at low cost. Synthetic resin string is a form in which the synthetic resin sheet is cut in the longitudinal direction of a constant width, and both side end portions are folded and bonded to each other. Such synthetic resin straps can be easily manufactured by a simple process using inexpensive synthetic resins, but exhibit some texture, but have a problem in that dimensional stability is greatly reduced due to the elasticity of the synthetic resin itself.

Meanwhile, a composite string produced by placing a core material of high tensile strength (very low elasticity) in a synthetic resin sheet cut in the longitudinal direction as described above and then bonding the synthetic resin sheets to each other has been developed. Such a composite string shows superior dimensional stability than the synthetic resin string, but has a problem in that texture, such as bulkiness and cushioning property, is inferior.

Therefore, the object of the present invention is to solve the problems of the prior art and the technical problem that has been requested from the past.

That is, the present invention, when used as a material of some or all of articles such as shoes, clothing, ornaments, etc., has excellent dimensional stability and exhibits excellent texture corresponding to natural leather strap, and can produce various aesthetics. To provide a composite strap.

The present inventors manufactured composite strings of various structures and tested their physical properties such as dimensional stability, texture, and aesthetics. As a result of the present invention, the inventors folded both ends of a thin sheet of synthetic leather to a constant length. In addition, it was found that the composite string produced by bonding the linear core material with low elongation and rigid circular cross-section inside it not only provides excellent dimensional stability, texture and aesthetics but also its production rate is very good. It came to complete this invention.

Figures 1a and 1b are perspective views of a band made of a constant repetitive form by weaving a composite string according to the present invention with another linear material;

2A and 2B are perspective views of sandals made using the bands of FIGS. 1A and 1B, respectively;

Figures 3a to 3g is a step view showing as part of the vertical cross-sectional process for producing a composite strap according to the present invention;

4 is one step diagram of a process for producing a composite string according to the present invention comprising two linear cores of circular cross section;

5 is a perspective view of a roller for applying pressure (and heat) in a finishing process for producing a composite strap according to the present invention.

Explanation of symbols for main parts of the drawings

100: compound string

110: lumber

120: adhesive

130: heartwood

200: shipboard material

300: band

400: sandal

500: roller

Synthetic leather composite string of the present invention, one or more linear cross-section cores of low elongation and high toughness, and a long strip shape surrounding them in the state bonded to the core material It comprises a synthetic leather (), wherein both ends of the leather is folded inward, the outer surface of the folded portion is composed of mutual bonding.

The composite strap according to the present invention having such a structure has one or two or more linear cross-sectional cores positioned therein in the state in which the outer surfaces of the folded both ends of the workpiece are bonded to each other, so that the strap is made of only synthetic leather. Compared to the conventional synthetic resin composite string in the vertical cross-sectional view, the dimensional stability and strength is very high, and by folding both sides of the material inwards by a certain length in the vertical cross section, thereby having a large volume and excellent cushioning properties. In addition, the synthetic leather which is the material of the material can exhibit a variety of colors and surface patterns, thereby exhibiting an excellent aesthetic.

The material of the linear core material is not particularly limited as long as it has a low elongation and high toughness. Although a boron fiber yarn etc. are mentioned, It is not limited to that. Preferably, fishing lines may be used which exhibit very low elongation and very high tensile strength. The cross-sectional shape of the linear core member has a circular cross section as described above. Compared with other cross-sectional linear cores such as square cross-sections, the linear cores of circular cross section can reduce the selectivity of the bonding position, and when the adhesive is applied to the cores, the application area of the adhesive is small and therefore the drying time is shortened. , The production rate is very good. As described above, the wire core material of the present invention may be used in one or two or more numbers in the composite string. Two or more may be used if very low elongation is required or very high strength is required.

The synthetic leather material having a strip shape has a relatively large width so as to surround the linear core material. Materials of synthetic leather are known in the art, and examples thereof include, but are not limited to, solvent-based polyurethane synthetic leather, water-based polyurethane synthetic leather, and the like. In general, synthetic leather is composed of a base layer of a woven or nonwoven fabric, a silver layer, a top skin layer and the like, including an adhesive layer for mutual adhesion thereof. The adhesive layer is located between the base layer and the silver layer, or between the silver layer and the top skin layer, or between each of these layers. The base layer provides the mechanical strength of the entire synthetic leather, the silver layer provides the texture as leather, and the top skin layer forms the outer surface of the leather. However, in recent years, synthetic leather has been developed that provides physical properties as leather without having such a sequential structure. Moreover, the synthetic leather material required by the present invention does not necessarily have the physical properties required by the synthetic leather as a general material, and therefore, the synthetic leather defined in the present invention is not limited to the definition of general synthetic leather.

As described above, both ends of the workpiece are bonded to each other in the folded state to provide a volume of constant size. The size of the folded width of the end may be 1/5 to 1/2 of the size of the overall width. If the folded width is less than 1/5 of the total width, the remaining space that is not folded at the time of bonding is so large that the adhesion of the core core may be reduced, and if it is larger than 1/2, it may overlap with the folded portion of the opposite end. It may not be desirable. However, when two or more linear core materials are used, the folded width may be 1/5 or less, and the folded width may be 1/2 or more in order to give a higher texture, but is not particularly limited.

When the composite string is manufactured by mutually bonding the wire core in the state where the two ends are folded together, heat and pressure are simultaneously applied to improve adhesion and fix it in a uniform shape. Depending on the direction and the magnitude of the pressure may vary. For example, applying pressure only in the vertical direction to the folded portion of the workpiece gives a somewhat elongated cross-sectional shape, and applying pressure in both the vertical and horizontal directions to the folded portion of the workpiece gives a relatively large volume. A somewhat rounded shape of cross section can be obtained.

Since the composite strap according to the present invention can be produced in various sizes, the size of the core material and the material is not particularly limited.

Hereinafter, the structure and manufacturing process of the multi-purpose synthetic leather composite string according to the present invention will be described with reference to the drawings implemented as an embodiment, but the scope of the present invention is not limited thereto. To further facilitate understanding, some vertical cross-sections describe the structure and fabrication process of the composite strap and express them in approximate shape and size.

Referring to FIG. 3A, a strip-shaped synthetic leather material 110 is shown. The upper surface 112 of the material 110 is dried to the inner surface of the composite string made later, the lower surface 114 is exposed to the outer surface. Therefore, the bottom surface 114 may be surface treated to exhibit a separate pattern or texture. The material 110 may be manufactured by cutting a sheet of synthetic leather (not shown) to a predetermined width.

Referring to Figure 3b, the adhesive 120 is applied to the upper surface of the workpiece 110. Since the adhesive 120 is used for later adhesion to the core material and the folded state of the end portion of the workpiece 110, Therefore, the adhesive 120 may be applied only to the end portion of the workpiece 110, and the adhesive 120 may be applied to the core material. The adhesive 120 is not particularly limited, but natural latex is particularly preferred. Since natural latex has low adhesiveness in a dry state after application, it is advantageous in process processing, and when heat is heated as necessary, it is preferable because it can exhibit high adhesive strength. Therefore, the natural latex adhesive 120 is applied to the material 110 and then dried (in some cases, thermally dried).

Referring to FIG. 3C, both ends 116 of the workpiece 110 are folded inward by a predetermined length and bonded to each other to form a folded portion 118. Adhesion of the folded end 116 is achieved by an adhesive applied to the upper surface of the workpiece 110, and when the natural latex adhesive 120 is applied and dried on the upper surface of the workpiece 110 in the process of FIG. In the state, adhesion can be performed by applying heat and pressure. In FIG. 3C, the part S of the unsold end portion 116 is shown in the middle. At this time, the size of the unfolded workpiece portion (S) may correspond to the size of the linear core material (not shown) of the circular cross section to be located later. However, in some cases, the end portions 116 may be folded to abut almost so that an unfolded portion does not exist, and a linear core may be placed after applying an adhesive on the upper surface.

Referring to FIG. 3D, the workpiece 110 is rolled inward so that the outer side 118A of the folded portion 118 faces each other, and the linear core member 130 having a circular cross section is positioned therein. An adhesive (not shown) may be applied to the outer surface of the core 130 as in the case 110 of FIG. 3B. Preferably, a dry core material 130 is used after applying natural lactex on the outer surface. Then, the outer side 118A of the folded portion 118 at both ends of the workpiece is coated with a separate adhesive 122 before rolling the workpiece 110 inward, rolling at the same time, or simultaneously inward. do. Adhesive 122 is applied to all of the fold outside 118A and a portion of its opposite surface. The adhesive 122 applied to the outside of the folded portion 118 is not necessarily the same as the adhesive 120 applied to the upper surface of the material 110 or the outer surface of the core material 130. Preferably, the adhesive 122 having a higher adhesive strength than the adhesive 120 is preferable, and those known in the art as adhesives, and those having improved adhesion by appropriately mixing them or adding additional additives may be used. The linear core member 130 having a circular cross section is located in the outer space of the folded portion 113 as shown in FIG. 3D, but may be positioned on the folded portion 113 in some cases. In addition, in FIG. 3D, only one linear core member 130 having a circular cross section is installed inside the workpiece 110, but as shown in FIG. 4, two linear core members 130 and 132 or more linear core members may be installed. It may be. Although the linear core 130 is shown in the spaced space between the folded portions 118 at both ends in FIG. 3D, the linear core member 130 may be positioned on the folded portions 118 in some cases.

The process of FIG. 3D may be performed using a mold (not shown) having a curved surface corresponding to the curled shape of the workpiece 110. That is, the adhesive 122 is applied to the outer side 118A of the folded portion of the workpiece 110 while the workpiece 110 is moved on a molding frame in which the radius of curvature gradually decreases, and the inside of the workpiece 110 is dried. The core member 130 may be positioned at. At the final stage of the process using such a mold, both sides of the folded portion 118A of the workpiece 110 moving to the mold of very small radius of curvature will be in contact with each other.

Referring to FIG. 3E, the outer side 118A of the folds 118 at both ends of the workpiece 110 are bonded to each other, so that the shape of the approximate composite string 100 having the core 130 inserted therein is shown. Is made. Composite string 100 of such a shape is applied to the heat and pressure in order to further strengthen the adhesion of the workpiece 110 and the core 130 and the adhesion between the two folded portions 118 of the workpiece. In particular, the direction and size of the application of pressure has a great influence on the cross-sectional shape and texture of the composite string 100 is finally made.

FIG. 3F shows the shape of the composite strap 100 that is made when pressure (and heat) is applied primarily only in the vertical direction with respect to the fold 118 of the workpiece 110. The composite strap 100 thus made shows a somewhat elongated shape when viewed in cross section. On the other hand, FIG. 3G shows the shape of the composite strap 100 that is made when a large pressure is applied to the folded portion 118 of the workpiece 110 in the vertical direction as well as in the horizontal direction. The composite strap 100 thus made has a relatively large surface area when viewed in cross section, thereby providing an excellent texture due to its large volume and cushioning properties.

3F and 3G are not particularly limited to the method of applying heat and pressure. For example, as shown in FIG. 5, grooves 502 and 504 corresponding to the cross-sectional shape of the final composite string 100 are respectively generated. Pressure and heat may be applied while passing through the two rollers 500 which are engaged with each other.

The composite strap according to the present invention manufactured as such may be used as a part of materials such as shoes, clothing, ornaments, etc., and in the form of a band as shown in FIGS. It can be used as some material of these.

Those skilled in the art to which the present invention pertains will be capable of various modifications and applications based on the above contents, it is possible to add a well-known element to the separate physical properties or to improve the existing physical properties to the composite string according to the present invention And, it will be possible to add a separate additional process to improve the efficiency of the above-described manufacturing process for manufacturing it.

Claims (5)

One or two linear cross-sections of low elongation and high toughness, and a long strip-shaped synthetic leather enveloping the bonded cores while A synthetic leather composite string having excellent dimensional stability and texture, wherein the both ends of the material are folded inward and the outer surface of the folded part is bonded to each other. The synthetic leather composite string of claim 1, wherein the core is a fishing line. The synthetic leather composite string according to claim 1, wherein the material is made of an oil-based polyurethane synthetic leather or an aqueous polyurethane synthetic leather. The synthetic leather composite braid according to claim 1, wherein the size of the folded width at both ends of the material is 1/5 to 1/2 of the total width. The composite leather composite string according to claim 1, wherein the core material is finished by applying heat and pressure in a vertical direction, or in a vertical direction and a horizontal direction with respect to the folded portion of the material in the state where the core is located inward.