Insole and insole manufacturing method

Abstract

The present invention relates to an insole and a method for manufacturing the insole, and more particularly, to an insole including a thermally conductive sheet capable of maintaining thermal conductivity even when an expanded graphite sheet used in the insole is damaged, and a method for manufacturing the insole. The insole according to the present invention includes a thermally conductive sheet means, an upper finishing part, and a lower finishing part. The thermally conductive sheet means includes an expanded graphite sheet portion formed by thermally expanding graphite to form a sheet, and copper plate portions bonded to the upper and lower surfaces of the expanded graphite sheet portion to diffuse the thermal conductivity of the expanded graphite sheet portion, with a plurality of through holes formed at regular intervals from the upper surface to the lower surface. The upper finishing part is bonded to the upper part of the thermally conductive sheet means. The lower finishing part is injection-foamed to surround the lower part of the thermally conductive sheet means and is bonded to the upper finishing part. According to the present invention, copper foils are bonded to both sides of the expanded graphite sheet. In this case, even if the expanded graphite sheet is damaged by external force, heat is transferred through the copper foil, thereby maintaining the thermal conductivity of the thermally conductive sheet. According to the present invention, the lower finishing part is injection-foamed to surround the lower part of the thermal conductive sheet and is coupled to the upper finishing part through the through-holes of the thermal conductive sheet. In this case, since the lower finishing part inserted into the through-holes is coupled to the upper finishing part, separation of the upper and lower finishing parts from the thermal conductive sheet can be prevented even if the expanded graphite sheet is deformed or damaged, thereby reducing product defects.

Description

[Technical Field]

[0001] The present invention relates to an insole and a method for manufacturing an insole, and more particularly to an insole provided with a thermally conductive sheet that can maintain thermal conductivity even if an expanded graphite sheet used in the insole is damaged, and a method for manufacturing an insole. [Background technology]

[0002] Generally, an expanded graphite sheet refers to a graphite such as natural graphite, pyrolytic graphite, or kish graphite that is treated with a mixed solution of sulfuric acid, nitric acid, etc., washed and dried, then expanded at high temperature using a heating device, and rolled into a sheet using a roll or the like.

[0003] Expanded graphite sheets have a higher thermal conductivity in the planar direction than in the thickness direction, and are used as a component for transferring heat from a heat source to another location. For example, when used as a shoe insole, the expanded graphite sheet can be cut to an appropriate size and then finished with fabric, EVA sponge, shock-absorbing material, or other finishing materials attached to the top and bottom to create a heat-generating sheet.

[0004] However, in the case of heat generating sheets using the above-mentioned expanded graphite sheet, due to the brittle properties of the expanded graphite, the expanded graphite sheet is deformed or broken by external forces such as the weight of a pedestrian or the impact sustained while walking, which not only reduces the thermal conductivity of the expanded graphite sheet but also causes the adhesive surface of the expanded graphite sheet to peel off, separating the upper and lower finishing materials and causing the expanded graphite sheet to slip out from the separated area, resulting in loss of product functionality. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent No. 10-0958444 (Registration date: 2010.05.10) Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide an insole with a thermally conductive sheet that can maintain thermal conductivity even if the expanded graphite sheet used in the insole is damaged, and a method for manufacturing the insole. [Means for solving the problem]

[0007] The insole according to the present invention includes a thermally conductive sheet means, an upper finishing part, and a lower finishing part. The thermally conductive sheet means includes an expanded graphite sheet formed by heat-treating and expanding graphite to form a sheet, and copper plates bonded to the upper and lower surfaces of the expanded graphite sheet to diffuse the thermal conduction of the expanded graphite sheet, with a plurality of through-holes formed at regular intervals from the upper surface to the lower surface. The upper finishing part is bonded to the upper part of the thermally conductive sheet means. The lower finishing part is bonded to the upper finishing part by injection foaming to surround the lower part of the thermally conductive sheet means.

[0008] In the insole, the thickness of the expanded graphite sheet portion is preferably 400 to 500 μm, and the thickness of the copper plate portion is preferably 6 to 8 μm.

[0009] The method for manufacturing an insole according to the present invention includes an expanded graphite sheet preparing step, a copper plate preparing step, a copper plate bonding step, a thermally conductive sheet manufacturing step, an upper finishing part bonding step, a molding step, and a finishing step. The expanded graphite sheet preparing step involves preparing an expanded graphite sheet part by heat-treating graphite to expand it into a sheet. The copper plate preparing step involves preparing a copper plate part for diffusing thermal conduction of the expanded graphite sheet part. The copper plate bonding step involves bonding the copper plate parts to the upper and lower surfaces of the expanded graphite sheet part using an adhesive. The thermally conductive sheet manufacturing step involves forming a plurality of through-holes spaced at regular intervals from the upper surface to the lower surface of the expanded graphite sheet part to which the copper plate part was bonded in the copper plate bonding step, and cutting the expanded graphite sheet part into the shape of an insole to manufacture a thermally conductive sheet means. The upper finishing part bonding step involves bonding the upper finishing part to the upper part of the thermally conductive sheet means manufactured into the shape of an insole using an adhesive. In the forming step, the lower finishing part is combined with the upper finishing part and foamed to surround the lower part of the thermally conductive sheet means so as not to expose the thermally conductive sheet means, thereby forming the lower finishing part into an insole shape. In the completing step, the upper finishing part combined with the upper part of the thermally conductive sheet means is cut into the insole shape to complete the insole. [Effects of the Invention]

[0010] According to the present invention, copper foils are bonded to both sides of the expansive graphite sheet. In this case, even if the expansive graphite sheet is damaged by external force, heat is transferred through the copper foils, thereby maintaining the thermal conductivity of the thermal conductive sheet.

[0011] According to the present invention, the lower finishing part is injection-foamed to surround the lower part of the thermal conductive sheet and is coupled to the upper finishing part through the through-holes of the thermal conductive sheet. In this case, since the lower finishing part inserted into the through-holes is coupled to the upper finishing part, separation of the upper and lower finishing parts from the thermal conductive sheet can be prevented even if the expanded graphite sheet is deformed or damaged, thereby reducing product defects. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a conceptual diagram of a thermally conductive sheet means of an insole according to the present invention. [Figure 2] 1 is a cross-sectional view of one embodiment of an insole according to the present invention. [Figure 3] 1 is a flowchart of a method for manufacturing an insole according to the present invention. [Figure 4] 4 is a flow chart illustrating the method for manufacturing the insole of FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of an insole and an insole manufacturing method according to the present invention will be described with reference to FIGS.

[0014] First, the insole according to the present invention includes a heat-conducting sheet means 10, an upper finishing part 20, and a lower finishing part 30.

[0015] The heat-conducting sheet means 10 includes an expanded graphite sheet portion 11 and a copper foil portion 13, and has through-holes 15 formed therein.

[0016] The expanded graphite sheet portion 11 is made by expanding graphite through heat treatment and then forming it into a sheet. Here, the expanded graphite sheet portion 11 is formed to a thickness of approximately 400 to 500 μm. The expanded graphite sheet portion 11 has the advantages of high thermal conductivity and high heat retention, but has the disadvantage of being easily broken.

[0017] The copper foil portion 13 protects the expansive graphite sheet portion 11 while maintaining thermal conductivity even if the expansive graphite sheet portion 11 is damaged. To this end, the copper foil portion 13 is bonded to the upper and lower surfaces of the expansive graphite sheet portion 11 by an adhesive G. Therefore, since the copper foil portion 13 has high thermal conductivity, even if the expansive graphite sheet portion 11 is damaged, heat is transferred via the copper foil portion 13, so the thermal conductivity of the heat-conducting sheet means 10 can be maintained. Here, each of the copper foil portions 13 is formed to a thickness of 6 to 8 μm.

[0018] A plurality of through holes 15 are formed at regular intervals, penetrating from the upper surface to the lower surface of the thermally conductive sheet means 10 .

[0019] The upper finish part 20 is bonded to the upper part of the heat conductive sheet means 10 by adhesive G. Here, the upper finish part 20 may be made of various materials such as cloth, leather, fiber, etc. according to the needs of the user.

[0020] The lower finishing part 30 is injection foamed to surround the lower part of the thermally conductive sheet means 10 and is coupled to the upper finishing part 20. Here, the lower finishing part 30 may be made of a PU foaming agent, an EVA foaming agent, a plastic foaming agent, etc., and is formed thicker than the upper finishing part 20 to function as a cushion. Since the lower finishing part 30 is injection foamed and coupled to the upper finishing part 20 through the through holes 15, separation of the upper finishing part 20 and the lower finishing part 30 from the thermally conductive sheet means 10 can be prevented even if the expanded graphite sheet part 11 is deformed or damaged by external force. This reduces product defects.

[0021] A method for producing an insole according to the present invention will now be described.

[0022] The insole manufacturing method according to the present invention includes an expanded graphite sheet preparation step S1, a copper foil preparation step S3, a copper foil bonding step S5, a thermal conductive sheet manufacturing step S7, an upper finishing part bonding step S9, a molding step S11, and a completion step S13.

[0023] In the expanded graphite sheet preparation step S1, as shown in FIG. 4(a), graphite is heat-treated to expand it, and then formed into a sheet to prepare an expanded graphite sheet portion 11.

[0024] In the copper foil preparation step S3, a copper foil portion 13 having high thermal conductivity is prepared to protect the expansive graphite sheet portion 11 and maintain thermal conductivity even if the expansive graphite sheet portion 11 is damaged.

[0025] In the copper foil bonding step S5, as shown in FIG. 4(b), the copper foil parts 13 prepared in the copper foil preparation step S3 are bonded to the upper and lower surfaces of the expanded graphite sheet parts 11 prepared in the expanded graphite sheet preparation step S1 using adhesive G.

[0026] In the thermal conductive sheet manufacturing step S7, as shown in Fig. 4(c), through holes 15 are formed from the upper surface to the lower surface of the expanded graphite sheet part 11 to which the copper foil part 13 is bonded in the copper foil bonding step S5, and then, as shown in Fig. 4(d), the expanded graphite sheet part 11 is cut into an insole shape to manufacture the thermal conductive sheet means 10. At this time, a plurality of through holes 15 are formed at regular intervals.

[0027] In the upper finishing part joining step S9, as shown in FIG. 4(e), the upper finishing part 20 is joined to the upper part of the insole-shaped thermal conductive sheet means 10 manufactured in the thermal conductive sheet manufacturing step S7 using adhesive G.

[0028] 4(f), in the molding step S11, the lower finishing part 30 is foamed under the thermally conductive sheet means 10 to which the upper finishing part 20 was bonded in the upper finishing part bonding step S9, thereby forming an insole shape. At this time, the lower finishing part 30 is bonded to the upper finishing part 20 and is formed to surround the lower part of the thermally conductive sheet means 10 so that the thermally conductive sheet means 10 is not exposed. In this embodiment, the thermally conductive sheet means 10 to which the upper finishing part 20 is bonded is placed in a mold, and then the material for the lower finishing part 30 is injected and foamed toward the lower part of the thermally conductive sheet means 10, thereby bonding the thermally conductive sheet means 10 to the lower finishing part 30. At this time, the lower finishing part 30 is not only bonded to the thermally conductive sheet means 10, but also partially enters the through-holes 15 of the thermally conductive sheet means 10 to be bonded to the upper finishing part 20. In this case, even if the expanded graphite sheet portion 11 of the thermally conductive sheet means 10 is deformed or damaged by an external force, the upper finishing portion 20 and the lower finishing portion 30 can be prevented from being separated from the thermally conductive sheet means 10. Therefore, product defects can be reduced.

[0029] In the completion step S13, the upper finishing part 20 coupled to the upper part of the thermally conductive sheet means 10 is cut into an insole shape to complete the insole. In this embodiment, the thermally conductive sheet means 10 coupled to the lower finishing part 30 formed into the insole shape in the molding step S11 is removed from the mold, and then the upper finishing part 20 coupled to the upper part of the thermally conductive sheet means 10 is cut into the same shape as the insole of the thermally conductive sheet means 10.

[0030] In conventional shoe insoles, when a heat-generating sheet using an expanded graphite sheet is applied, the brittle properties of the expanded graphite can cause deformation or breakage of the expanded graphite sheet due to external forces such as the weight of a walker or sustained impact while walking. This not only reduces the thermal conductivity of the expanded graphite sheet, but also causes the adhesive surface of the expanded graphite sheet to peel off, separating the upper and lower finishing materials, causing the expanded graphite sheet to slip out from the separated area, resulting in loss of product functionality. In contrast, in the present embodiment, copper foil portions 13 are bonded to both sides of the expanded graphite sheet portion 11. In this case, even if the expanded graphite sheet portion 11 is damaged by external forces, heat is transferred via the copper foil portions 13, thereby maintaining the thermal conductivity of the thermally conductive sheet means 10. In addition, in the present embodiment, the lower finishing portion 30 is injection-foamed to surround the lower portion of the thermally conductive sheet means 10 and is bonded to the upper finishing portion 20 through the through-holes 15 in the thermally conductive sheet means 10. In this case, since the lower finishing part 30 inserted into the through hole 15 is coupled to the upper finishing part 20, even if the expansive graphite sheet part 11 is deformed or ruptured, the upper finishing part 20 and the lower finishing part 30 can be prevented from being separated from the thermally conductive sheet means 10. Therefore, product defects can be reduced. [Explanation of symbols]

[0031] 10. Heat Conduction Sheet Means 11 Expanded graphite sheet part 13 Copper foil section 15 through holes 20 Upper finishing section 30 Lower finishing section G. Adhesive

Claims

1. an expanded graphite sheet portion formed by heat-treating and expanding graphite to form a sheet; and a thermally conductive sheet means having copper foil portions bonded to upper and lower surfaces of the expanded graphite sheet portion so as to diffuse thermal conduction of the expanded graphite sheet portion, the thermal conductive sheet means having a plurality of through holes formed therein at regular intervals and penetrating from the upper surface to the lower surface; an upper finish portion coupled to an upper portion of the heat conductive sheet means; The insole further comprises a lower finishing part which is injection foamed to surround a lower part of the heat conductive sheet means and is coupled to the upper finishing part.

2. The thickness of the expanded graphite sheet portion is 400 to 500 μm, 2. The insole according to claim 1, wherein the thickness of the copper foil portion is 6 to 8 μm.

3. an expanded graphite sheet preparation step of preparing an expanded graphite sheet portion by heat-treating and expanding graphite; a copper foil preparation step of preparing a copper foil portion for diffusing the thermal conductivity of the expansive graphite sheet portion; a copper foil bonding step of bonding the copper foil portions to the upper and lower surfaces of the expansive graphite sheet portion using an adhesive; a thermal conductive sheet manufacturing step in which a plurality of through holes are formed at regular intervals in the expanded graphite sheet portion to which the copper foil portion is bonded, the through holes penetrating from the upper surface to the lower surface, and the expanded graphite sheet portion is cut into an insole shape to manufacture a thermal conductive sheet means; an upper finishing part bonding step of bonding an upper finishing part to an upper part of the thermally conductive sheet means manufactured into an insole shape using an adhesive; a molding step of foaming a lower finishing part to combine with the upper finishing part and surround a lower part of the thermal conductive sheet means so as not to expose the thermal conductive sheet means, and molding the lower finishing part into an insole shape; The method for manufacturing an insole comprises a finishing step of cutting the upper finishing part coupled to the upper part of the thermally conductive sheet means into an insole shape to complete the insole.

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