WO2009054626A2 - A shoe and midsole manufacturing method having 2-state insert structure - Google Patents
A shoe and midsole manufacturing method having 2-state insert structure Download PDFInfo
- Publication number
- WO2009054626A2 WO2009054626A2 PCT/KR2008/005923 KR2008005923W WO2009054626A2 WO 2009054626 A2 WO2009054626 A2 WO 2009054626A2 KR 2008005923 W KR2008005923 W KR 2008005923W WO 2009054626 A2 WO2009054626 A2 WO 2009054626A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hardness
- midsole
- shoe
- low
- polyurethane
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229920002635 polyurethane Polymers 0.000 claims abstract description 59
- 239000004814 polyurethane Substances 0.000 claims abstract description 59
- 239000004677 Nylon Substances 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 229920001778 nylon Polymers 0.000 claims abstract description 22
- 230000009977 dual effect Effects 0.000 claims abstract description 7
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 28
- 239000011496 polyurethane foam Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 15
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 238000005304 joining Methods 0.000 abstract description 4
- 210000000544 articulatio talocruralis Anatomy 0.000 abstract description 3
- 210000000629 knee joint Anatomy 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000012948 isocyanate Substances 0.000 description 8
- 150000002513 isocyanates Chemical class 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000005187 foaming Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 210000002683 foot Anatomy 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229920002396 Polyurea Polymers 0.000 description 2
- -1 aromatic isocyanate Chemical class 0.000 description 2
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000000539 dimer Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- AVWRKZWQTYIKIY-UHFFFAOYSA-N urea-1-carboxylic acid Chemical compound NC(=O)NC(O)=O AVWRKZWQTYIKIY-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- 229920002334 Spandex Polymers 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- ZZTCPWRAHWXWCH-UHFFFAOYSA-N diphenylmethanediamine Chemical compound C=1C=CC=CC=1C(N)(N)C1=CC=CC=C1 ZZTCPWRAHWXWCH-UHFFFAOYSA-N 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004759 spandex Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/38—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/026—Composites, e.g. carbon fibre or aramid fibre; the sole, one or more sole layers or sole part being made of a composite
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/12—Soles with several layers of different materials
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/12—Soles with several layers of different materials
- A43B13/125—Soles with several layers of different materials characterised by the midsole or middle layer
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/12—Soles with several layers of different materials
- A43B13/125—Soles with several layers of different materials characterised by the midsole or middle layer
- A43B13/127—Soles with several layers of different materials characterised by the midsole or middle layer the midsole being multilayer
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/143—Soles; Sole-and-heel integral units characterised by the constructive form provided with wedged, concave or convex end portions, e.g. for improving roll-off of the foot
- A43B13/145—Convex portions, e.g. with a bump or projection, e.g. 'Masai' type shoes
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/38—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process
- A43B13/40—Built-in insoles joined to uppers during the manufacturing process, e.g. structural insoles; Insoles glued to shoes during the manufacturing process with cushions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
- B29D35/14—Multilayered parts
- B29D35/142—Soles
Definitions
- the present invention relates to a health shoe including a midsole having a dual insert structure and a method of manufacturing the same, and, more particularly, to a health shoe including a midsole having a dual insert structure, in which the midsole is formed by joining low-hardness polyurethane and middle-hardness polyurethane together through a foaming process and thus the shoe is not hydrolyzed and has excellent cushioning properties, and to a method of manufacturing the same.
- a shoe in order to minimize the impact occurring when a shoe comes into contact with the ground, a shoe is provided with a sole assembly including a midsole which has relatively low hardness and which is formed at a predetermined thickness, and an outsole which has higher hardness than the midsole and which is placed beneath the midsole.
- the midsole is generally made of polyurethane foam or ethylene-vinyl acetate (EVA) foam in order to absorb impact, and the outsole is made of a rubber material in consideration of friction between the outsole and the ground and durability.
- EVA ethylene-vinyl acetate
- the former method is problematic in that the process is complicated, a process of preparing an air bag or air gel is additionally required, and additional costs are also required, and in that, when the midsole, air bag and air gel are used for a long period of time, they become deformed, and thus an inherent impact absorbing function is not suitably exhibited.
- a method of preparing polyurethane foam for a midsole includes the steps of placing a polyurethane raw material into a mold and then closing the mold, foaming the polyurethane raw material by heating the upper and lower plates of the mold using the upper and lower hot plate of a polyurethane molding machine to form polyurethane foam, and opening the mold and then separating the polyurethane foam from the mold.
- an object of the present invention is to provide a shoe having excellent cushioning properties, which can overcome the problem of hydrolysis by enabling an inner polyurethane layer having low hardness and an outer polyurethane layer having middle hardness to be easily joined to each other without using an additional adhesive.
- an aspect of the present invention provides a shoe including a midsole having a dual insert structure, the midsole including: a hard nylon injection piece layer; a low-hardness (30C) polyurethane layer covering the nylon injection piece layer; and a middle-hardness (55-60C) polyurethane layer covering the low-hardness polyurethane layer.
- another aspect of the present invention provides a method of manufacturing a midsole having a dual insert structure included in a shoe, including: fabricating a hard nylon injection piece (SlO); inserting the hard nylon injection piece into a mold and then introducing a low-hardness polyurethane material into the mold to form a low-hardness polyurethane foam (S20); and inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle-hardness polyurethane material into the mold to form a middle-hardness polyurethane foam covering the low-hardness polyurethane foam (S30).
- SlO hard nylon injection piece
- S20 low-hardness polyurethane foam
- S30 middle-hardness polyurethane foam covering the low-hardness polyurethane foam
- FIG. 1 is a perspective view showing a shoe according to the present invention
- FIG. 2 is a schematic view showing a midsole according the present invention
- FIG. 3 is a sectional view of a nylon injection piece layer of the midsole of the present invention.
- FIG. 4 is a sectional view of a low hardness polyure thane layer of the midsole of the present invention.
- FIG. 5 is a sectional view of a middle hardness polyurethane layer of the midsole of the present invention.
- FIG. 6 is a flowchart showing a process of manufacturing the midsole according to the present invention. Best Mode for Carrying out the Invention
- a shoe of the present invention includes an upper 10 constituting a top part of the shoe, a midsole 20 constituting a cushion part of the shoe, and an outsole 30 covering the midsole and constituting a bottom part of the shoe.
- the midsole 20 includes three layers, that is, a hard nylon injection piece layer 21, a low-hardness (30C) polyurethane layer 22 covering the hard nylon injection piece layer, and a middle-hardness (55-60C) polyurethane layer 23 covering the low- hardness polyurethane layer.
- a method of manufacturing the midsole of the shoe includes the steps of: fabricating a hard nylon injection piece (SlO); inserting the hard nylon injection piece into a mold and then introducing a low-hardness polyurethane material into the mold to form a low -hardness polyurethane foam (S20); and inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle-hardness polyurethane material into the mold to form a middle- hardness polyurethane foam covering the low-hardness polyurethane foam (S30).
- the midsole of the shoe is manufactured by inserting the hard nylon injection piece into a mold and then introducing a low-hardness polyurethane material into the mold to form a low-hardness polyurethane foam, and then inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle-hardness polyurethane material into the mold to form a middle-hardness polyurethane foam covering the low-hardness polyurethane foam, the human body is not influenced by discontinuous impact occurring when the shoe comes into contact with the ground.
- a hard nylon injection piece layer 21 is inserted into a mold for low-hardness polyurethane, and then a low-hardness polyurethane layer 22 is inserted into the mold to form low-hardness (30C) polyurethane foam.
- the hard nylon injection piece layer 21 is inserted into the mold, and then a non foamed low-hardness polyurethane material is introduced into the mold, and then a foam- forming process is performed at a predetermined temperature and pressure to form the low-hardness polyurethane foam.
- the hardness of the material is adjusted by the control of foaming properties due to the change in the temperature and pressure of the mold.
- the "low hardness” means a hardness of about 30C in a Shore C type hardness meter.
- the low-hardness polyurethane foam is inserted into a mold for middle-hardness polyurethane, and then a middle-hardness polyurethane material is introduced into the mold, then a foaming process is performed to form middle- hardness polyurethane foam.
- the middle-hardness polyurethane foam is inserted into the mold and then foam-formed at a predetermined temperature and pressure.
- the "middle hardness” means a hardness of 55-60C in a Shore C type hardness meter.
- the shoe including the midsole manufactured by the above method has excellent elasticity and stability, and is very light and cushioned. Further, in the shoe, since the low-hardness (30C) polyurethane layer 22 is not joined to the middle-hardness (55-60C) polyurethane layer 23 with an adhesive, the hydrolysis of the shoe can be prevented, and the low-hardness polyurethane layer or middle-hardness polyurethane layer is 2/3 lighter than other polyurethane.
- the impact strength applied to the low-hardness polyurethane layer 22 is inversely proportional to the area of the bottom of a foot, and is proportional to the weight of the human body pressing the ground.
- These polyfunctional groups are formed into compounds having a structure of [-NHCOO-] , which is a urethane bond, while n generating high-temperature heat.
- compounds having a molecular weight of 1000 or more are referred to as polyurethane.
- Allophanate & Biuret reaction The urea formed by the polyurea reaction and active hydrogen remaining in the urea are reacted with excess isocyanate under suitable conditions to form allophanate and biuret, which is a crosslinking reaction.
- Uretidinedion & Isocyanurate reaction Isocyanates are reacted with each other in the presence of a basic catalyst to form uretidinedion as a dimer and isocyanurate as a trimer.
- the dimer is produced from aromatic isocyanate.
- 4,4-diphenylmethane diisocyanate which is monomeric MDI, is slowly dimerized at room temperature and thus formed into an insoluble polymer material at high temperature.
- Isocyanurate is formed by heating aliphatic and aromatic isocyanates, and this heating reaction is accelerated by a basic catalyst.
- MDI is a material obtained by treating diphenylmethane diamine (MDA) formed by condensing aniline and formaldehyde with phosgene (COCl ).
- MDA diphenylmethane diamine
- COCl phosgene
- the reaction product includes various isomers and coenocytes, but pure MDI (crude MDI) is separated therefrom by refining the reaction product. Since monomeric MDI is a white solid at room temperature, it is modified into liquid MID, such as carbodiimide- modified MDI or uretonimine-modified MDI, and then used. Polymeric MDI is liquid at room temperature.
- the product has an average functional group number of about 2.3 ⁇ 3.0, and is characterized by viscosity, reactivity and NCO content.
- the viscosity of the product depends on its average molecular weight and NCO content.
- Monomeric MDI is chiefly used in nonfoamy polyurethane products such as Spandex, synthetic leather, elastomer, coating, sealant, and the like.
- Polymeric MDI is widely used to manufacture polyurethane foam used for insulation materials for refrigerators, containers, sprays and buildings, and interior materials for automobiles.
- the shoe according to the present invention is advantageous in that since a midsole includes two different polyurethane layers, that is, a polyurethane layer having low hardness and a polyurethane layer having middle hardness, the midsole can completely absorb the impact transferred from the ground when it comes into contact with the ground, and thus the impact is not transferred to an ankle or knee joint.
- the shoe according to the present invention is advantageous in that, since the midsole is formed by joining low-hardness polyurethane and middle-hardness polyurethane together without using an additional adhesive, the shoe is not hydrolyzed, thereby increasing the lifespan of the shoe.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
Disclosed herein is a shoe including a midsole having a dual insert structure, the midsole including: a hard nylon injection piece layer; a low-hardness polyurethane layer covering the nylon injection piece layer; and a middle-hardness polyurethane layer covering the low-hardness polyurethane layer. The shoe is advantageous in that, since a midsole includes two different polyurethane layers, that is, a polyurethane layer having low hardness and a polyurethane layer having middle hardness, the midsole can completely absorb the impact transferred from the ground when it comes into contact with the ground, and thus the impact is not transferred to an ankle or knee joint. Further, the shoe according to the present invention is advantageous in that, since the midsole is formed by joining low-hardness polyurethane and middle -hardness polyurethane together without using an additional adhesive, the shoe is not hydrolyzed, thereby increasing the lifespan of the shoe.
Description
Description
A SHOE AND MIDSOLE MANUFACTURING METHOD HAVING 2-STATE INSERT STRUCTURE
Technical Field
[1] The present invention relates to a health shoe including a midsole having a dual insert structure and a method of manufacturing the same, and, more particularly, to a health shoe including a midsole having a dual insert structure, in which the midsole is formed by joining low-hardness polyurethane and middle-hardness polyurethane together through a foaming process and thus the shoe is not hydrolyzed and has excellent cushioning properties, and to a method of manufacturing the same. Background Art
[2] Generally, in order to minimize the impact occurring when a shoe comes into contact with the ground, a shoe is provided with a sole assembly including a midsole which has relatively low hardness and which is formed at a predetermined thickness, and an outsole which has higher hardness than the midsole and which is placed beneath the midsole.
[3] The midsole is generally made of polyurethane foam or ethylene-vinyl acetate (EVA) foam in order to absorb impact, and the outsole is made of a rubber material in consideration of friction between the outsole and the ground and durability.
[4] However, since the conventional sole assembly chiefly depends on the midsole in order to absorb the impact occurring when a shoe comes into contact with the ground, when the ground is hard or uneven, this sole assembly does not suitably absorb the impact, so that the impact is directly transferred to a foot and knee, thereby negatively affecting an ankle or knee joint.
[5] In order to solve this problem, a method of absorbing impact by inserting a member functioning to absorb impact, such as an air bag, an air gel or the like, into the midsole in various shapes so that the member is integrated with the midsole, or a method of absorbing impact from the ground by forming a plurality of hollow portions in the midsole has been conducted.
[6] However, the former method is problematic in that the process is complicated, a process of preparing an air bag or air gel is additionally required, and additional costs are also required, and in that, when the midsole, air bag and air gel are used for a long period of time, they become deformed, and thus an inherent impact absorbing function is not suitably exhibited.
[7] Meanwhile, a method of preparing polyurethane foam for a midsole includes the steps of placing a polyurethane raw material into a mold and then closing the mold,
foaming the polyurethane raw material by heating the upper and lower plates of the mold using the upper and lower hot plate of a polyurethane molding machine to form polyurethane foam, and opening the mold and then separating the polyurethane foam from the mold.
[8] However, since a shoe is manufactured by joining polyurethane foam and different kinds of materials with an adhesive, as time advances, there is a problem in that the polyurethane foam is hydrolyzed by the adhesive. Disclosure of Invention Technical Problem
[9] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a shoe having excellent cushioning properties, which can overcome the problem of hydrolysis by enabling an inner polyurethane layer having low hardness and an outer polyurethane layer having middle hardness to be easily joined to each other without using an additional adhesive. Technical Solution
[10] In order to accomplish the above object, an aspect of the present invention provides a shoe including a midsole having a dual insert structure, the midsole including: a hard nylon injection piece layer; a low-hardness (30C) polyurethane layer covering the nylon injection piece layer; and a middle-hardness (55-60C) polyurethane layer covering the low-hardness polyurethane layer.
[11] Further, another aspect of the present invention provides a method of manufacturing a midsole having a dual insert structure included in a shoe, including: fabricating a hard nylon injection piece (SlO); inserting the hard nylon injection piece into a mold and then introducing a low-hardness polyurethane material into the mold to form a low-hardness polyurethane foam (S20); and inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle-hardness polyurethane material into the mold to form a middle-hardness polyurethane foam covering the low-hardness polyurethane foam (S30). Brief Description of Drawings
[12] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, reference should now be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. Further, in case it is judged that detailed description of the known functions and configuration thereof may obscure the gist of the invention, it should be understood that the detailed description is omitted.
[13] FIG. 1 is a perspective view showing a shoe according to the present invention;
[14] FIG. 2 is a schematic view showing a midsole according the present invention;
[15] FIG. 3 is a sectional view of a nylon injection piece layer of the midsole of the present invention;
[16] FIG. 4 is a sectional view of a low hardness polyure thane layer of the midsole of the present invention;
[17] FIG. 5 is a sectional view of a middle hardness polyurethane layer of the midsole of the present invention; and
[18] FIG. 6 is a flowchart showing a process of manufacturing the midsole according to the present invention. Best Mode for Carrying out the Invention
[19] As shown in FIG. 1, like a conventional shoe, a shoe of the present invention includes an upper 10 constituting a top part of the shoe, a midsole 20 constituting a cushion part of the shoe, and an outsole 30 covering the midsole and constituting a bottom part of the shoe.
[20] Further, the midsole 20 includes three layers, that is, a hard nylon injection piece layer 21, a low-hardness (30C) polyurethane layer 22 covering the hard nylon injection piece layer, and a middle-hardness (55-60C) polyurethane layer 23 covering the low- hardness polyurethane layer.
[21] Further, a method of manufacturing the midsole of the shoe includes the steps of: fabricating a hard nylon injection piece (SlO); inserting the hard nylon injection piece into a mold and then introducing a low-hardness polyurethane material into the mold to form a low -hardness polyurethane foam (S20); and inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle-hardness polyurethane material into the mold to form a middle- hardness polyurethane foam covering the low-hardness polyurethane foam (S30).
[22] In this method, since the midsole of the shoe is manufactured by inserting the hard nylon injection piece into a mold and then introducing a low-hardness polyurethane material into the mold to form a low-hardness polyurethane foam, and then inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle-hardness polyurethane material into the mold to form a middle-hardness polyurethane foam covering the low-hardness polyurethane foam, the human body is not influenced by discontinuous impact occurring when the shoe comes into contact with the ground.
[23] Hereinafter, the method of manufacturing the midsole of the shoe according to the present invention is described in more detail as follows.
[24] First, a hard nylon injection piece layer 21 is inserted into a mold for low-hardness polyurethane, and then a low-hardness polyurethane layer 22 is inserted into the mold
to form low-hardness (30C) polyurethane foam.
[25] That is, the hard nylon injection piece layer 21 is inserted into the mold, and then a non foamed low-hardness polyurethane material is introduced into the mold, and then a foam- forming process is performed at a predetermined temperature and pressure to form the low-hardness polyurethane foam.
[26] The hardness of the material is adjusted by the control of foaming properties due to the change in the temperature and pressure of the mold. In the present invention, the "low hardness" means a hardness of about 30C in a Shore C type hardness meter.
[27] Subsequently, the low-hardness polyurethane foam is inserted into a mold for middle-hardness polyurethane, and then a middle-hardness polyurethane material is introduced into the mold, then a foaming process is performed to form middle- hardness polyurethane foam. The middle-hardness polyurethane foam is inserted into the mold and then foam-formed at a predetermined temperature and pressure. In the present invention, the "middle hardness" means a hardness of 55-60C in a Shore C type hardness meter.
[28] The shoe including the midsole manufactured by the above method has excellent elasticity and stability, and is very light and cushioned. Further, in the shoe, since the low-hardness (30C) polyurethane layer 22 is not joined to the middle-hardness (55-60C) polyurethane layer 23 with an adhesive, the hydrolysis of the shoe can be prevented, and the low-hardness polyurethane layer or middle-hardness polyurethane layer is 2/3 lighter than other polyurethane.
[29] Further, when the shoe comes into contact with the ground during walking, a part of the bottom of a foot partially presses the middle-hardness polyurethane layer 23 of the midsole. In this case, the impact strength applied to the low-hardness polyurethane layer 22 is inversely proportional to the area of the bottom of a foot, and is proportional to the weight of the human body pressing the ground.
[30] For this reason, the impact strength applied to the middle-hardness polyurethane layer 23 is dispersed to the low-hardness polyurethane layer 22, thus improving the cushioning property of the shoe.
[31] Accordingly, the impact occurring during walking is uniformly dispersed, and thus the impact transferred from the ground to the human body is decreased.
[32] Hereinafter, a method of preparing polyurethane used in the present invention is described as follows.
[33] First, polyurethane is formed by the addition polymerization reaction of alcohol having an active hydroxide group (-OH) and isocyanate having an isocyanate group (-N=C=O) while generating reaction heat. Isocyanates having one or more isocyanate groups (-N=C=O) and alcohols having one or more hydroxide groups (-OH) are referred to as polyfunctional groups. These polyfunctional groups are formed into
compounds having a structure of [-NHCOO-] , which is a urethane bond, while n generating high-temperature heat. Among the compounds, compounds having a molecular weight of 1000 or more are referred to as polyurethane.
[34] Side reactions in the formation of polyurethane are described below.
[35] Polyurea reaction: Isocyanate reacted with polyfunctional alcohol is reacted with water (H O) to form urea and carbon dioxide (CO ).
[36] Allophanate & Biuret reaction: The urea formed by the polyurea reaction and active hydrogen remaining in the urea are reacted with excess isocyanate under suitable conditions to form allophanate and biuret, which is a crosslinking reaction.
[37] Uretidinedion & Isocyanurate reaction: Isocyanates are reacted with each other in the presence of a basic catalyst to form uretidinedion as a dimer and isocyanurate as a trimer. The dimer is produced from aromatic isocyanate. For example, 4,4-diphenylmethane diisocyanate, which is monomeric MDI, is slowly dimerized at room temperature and thus formed into an insoluble polymer material at high temperature. Isocyanurate is formed by heating aliphatic and aromatic isocyanates, and this heating reaction is accelerated by a basic catalyst.
[38] Polyurethane raw materials: isocyanate and 4,4-diphenylmethane diisocyanate
(MDI). MDI is a material obtained by treating diphenylmethane diamine (MDA) formed by condensing aniline and formaldehyde with phosgene (COCl ). The reaction product includes various isomers and coenocytes, but pure MDI (crude MDI) is separated therefrom by refining the reaction product. Since monomeric MDI is a white solid at room temperature, it is modified into liquid MID, such as carbodiimide- modified MDI or uretonimine-modified MDI, and then used. Polymeric MDI is liquid at room temperature. The product has an average functional group number of about 2.3 ~ 3.0, and is characterized by viscosity, reactivity and NCO content. The viscosity of the product depends on its average molecular weight and NCO content. Monomeric MDI is chiefly used in nonfoamy polyurethane products such as Spandex, synthetic leather, elastomer, coating, sealant, and the like. Polymeric MDI is widely used to manufacture polyurethane foam used for insulation materials for refrigerators, containers, sprays and buildings, and interior materials for automobiles. Industrial Applicability
[39] The shoe according to the present invention is advantageous in that since a midsole includes two different polyurethane layers, that is, a polyurethane layer having low hardness and a polyurethane layer having middle hardness, the midsole can completely absorb the impact transferred from the ground when it comes into contact with the ground, and thus the impact is not transferred to an ankle or knee joint.
[40] Further, the shoe according to the present invention is advantageous in that, since the
midsole is formed by joining low-hardness polyurethane and middle-hardness polyurethane together without using an additional adhesive, the shoe is not hydrolyzed, thereby increasing the lifespan of the shoe.
[41] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the present invention as disclosed in the accompanying claims.
Claims
[1] A shoe including a midsole having a dual insert structure, the midsole comprising: a hard nylon injection piece layer (21); a low-hardness (30C) polyurethane layer (22) covering the nylon injection piece layer; and a middle-hardness (55-60C) polyurethane layer (23) covering the low-hardness polyurethane layer.
[2] A method of manufacturing a midsole having a dual insert structure included in a shoe, comprising: fabricating a hard nylon injection piece (SlO); inserting the hard nylon injection piece into a mold and then introducing a low- hardness polyurethane material into the mold to form a low-hardness polyurethane foam (S20); and inserting the low-hardness polyurethane foam covering the hard nylon injection piece into the mold and then introducing a middle -hardness polyurethane material into the mold to form a middle -hardness polyurethane foam covering the low-hardness polyurethane foam (S30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08841995.7A EP2312963A4 (en) | 2008-08-12 | 2008-10-09 | A shoe and midsole manufacturing method having 2-state insert structure |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080078724A KR101116485B1 (en) | 2008-08-12 | 2008-08-12 | A Shoe and Midsole Manufacturing Method Having 2-State Insert Structure |
| KR10-2008-0078724 | 2008-08-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2009054626A2 true WO2009054626A2 (en) | 2009-04-30 |
| WO2009054626A3 WO2009054626A3 (en) | 2009-06-25 |
Family
ID=40580215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2008/005923 WO2009054626A2 (en) | 2008-08-12 | 2008-10-09 | A shoe and midsole manufacturing method having 2-state insert structure |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2312963A4 (en) |
| KR (1) | KR101116485B1 (en) |
| WO (1) | WO2009054626A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2342145A1 (en) * | 2010-01-05 | 2010-07-01 | Garridosa, S.L. | Sole for footwear (Machine-translation by Google Translate, not legally binding) |
| ITUB20151297A1 (en) * | 2015-05-27 | 2016-11-27 | Diadora Sport S R L | SOLE FOR SPORTS SHOES |
| CN110477520A (en) * | 2019-09-10 | 2019-11-22 | 东莞市佳浩新材料有限公司 | A kind of production technology of hot melt adhesive film combined insoles |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5775511B2 (en) | 2010-03-18 | 2015-09-09 | 株式会社半導体エネルギー研究所 | Deposition method |
| WO2011114872A1 (en) | 2010-03-18 | 2011-09-22 | 株式会社半導体エネルギー研究所 | Deposition method and deposition substrate manufacturing method |
| KR101258603B1 (en) * | 2011-01-18 | 2013-04-26 | (주)알와이엔코리아 | Shoes' structure for three step walking |
| KR101467460B1 (en) * | 2013-10-22 | 2014-12-01 | 정상옥 | Shoes sole with non slip function |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59103605U (en) * | 1982-12-28 | 1984-07-12 | 美津濃株式会社 | athletic shoe soles |
| US4561140A (en) * | 1983-09-23 | 1985-12-31 | New Balance Athletic Shoe, Inc. | Sole construction for footwear |
| KR890000902B1 (en) * | 1984-09-03 | 1989-04-13 | 스끼호시 가세이 가부시끼가이샤 | A midsole |
| JP3199357B2 (en) * | 1996-03-15 | 2001-08-20 | 株式会社シマノ | Sole core body of cycling shoe, method of molding the same, and mold device therefor |
| US5901468A (en) | 1997-04-01 | 1999-05-11 | Whyte; Robert S. | Flexible foot support insert for athletic shoe, and the like |
| JP3238132B2 (en) * | 1998-10-02 | 2001-12-10 | 美津濃株式会社 | Midsole structure for sports shoes |
| KR100593415B1 (en) * | 2004-03-23 | 2006-06-28 | 주식회사 우연 | Shoe sole formed from multiple injections and its manufacturing method |
| KR100706610B1 (en) * | 2006-10-12 | 2007-04-13 | 이태성 | Sole for seesaw footwear |
| KR100828908B1 (en) * | 2007-12-06 | 2008-05-09 | 장명계 | A shoe and midsole manufacturing method having 3-state midsole organizing |
-
2008
- 2008-08-12 KR KR1020080078724A patent/KR101116485B1/en active IP Right Grant
- 2008-10-09 EP EP08841995.7A patent/EP2312963A4/en not_active Withdrawn
- 2008-10-09 WO PCT/KR2008/005923 patent/WO2009054626A2/en active Application Filing
Non-Patent Citations (1)
| Title |
|---|
| See references of EP2312963A4 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2342145A1 (en) * | 2010-01-05 | 2010-07-01 | Garridosa, S.L. | Sole for footwear (Machine-translation by Google Translate, not legally binding) |
| ITUB20151297A1 (en) * | 2015-05-27 | 2016-11-27 | Diadora Sport S R L | SOLE FOR SPORTS SHOES |
| CN110477520A (en) * | 2019-09-10 | 2019-11-22 | 东莞市佳浩新材料有限公司 | A kind of production technology of hot melt adhesive film combined insoles |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100020078A (en) | 2010-02-22 |
| EP2312963A2 (en) | 2011-04-27 |
| WO2009054626A3 (en) | 2009-06-25 |
| EP2312963A4 (en) | 2013-08-28 |
| KR101116485B1 (en) | 2012-02-29 |
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