WO2018124385A1 - Semelle intercalaire en polyuréthane pour chaussure et son procédé de fabrication - Google Patents

Semelle intercalaire en polyuréthane pour chaussure et son procédé de fabrication Download PDF

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Publication number
WO2018124385A1
WO2018124385A1 PCT/KR2017/002048 KR2017002048W WO2018124385A1 WO 2018124385 A1 WO2018124385 A1 WO 2018124385A1 KR 2017002048 W KR2017002048 W KR 2017002048W WO 2018124385 A1 WO2018124385 A1 WO 2018124385A1
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Prior art keywords
polyurethane
midsole
film
foam
preform
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PCT/KR2017/002048
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English (en)
Korean (ko)
Inventor
박희대
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박희대
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Publication date
Priority claimed from KR1020170022676A external-priority patent/KR20180076987A/ko
Application filed by 박희대 filed Critical 박희대
Publication of WO2018124385A1 publication Critical patent/WO2018124385A1/fr

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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
    • A43B17/14—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined made of sponge, rubber, or plastic materials
    • 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
    • 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
    • B29D35/02—Producing footwear made in one piece using a moulding technique, e.g. by injection moulding or casting

Definitions

  • the present invention relates to a polyurethane midsole for shoes and a method of manufacturing the same, and more particularly, to reduce the specific gravity of the polyurethane foam to the specific gravity of the EVA foam to equal or less than to realize a lightweight, as well as the existing polyurethane foam It relates to a polyurethane midsole for shoes and a method of manufacturing the same to maintain the elastic force and cushioning as it has.
  • shoes are largely composed of a sole and an upper that is coupled to the top of the sole.
  • the sole also consists of an outsole that forms the sole of the shoe and a midsole that forms the midsole of the shoe.
  • the outsole is molded of rubber to satisfy the functions of wear resistance and slippage.
  • the midsole is made of synthetic resin that is foamed and expanded to absorb the impact and restore the light when impact is applied, while reducing the weight of the entire shoe. Doing.
  • the method for manufacturing shoe midsole with EVA foam is a method of injecting EVA and other additives, and then directly injecting them into a conventional injection molding machine (Injection Phylon), and mixing EVA and other additives, followed by free foam. Compression Molding
  • the weight of the product can be realized as a low specific gravity ( ⁇ 0.20 g / cc), but elasticity and other physical properties (specifically, cushioning, restoring force, etc.) are inferior to polyurethane foam.
  • a method of manufacturing a shoe midsole with a polyurethane foam is a method of forming a two-component polyurethane stock solution into a conventional foaming machine and then mixing and injecting it into a mold (foam) to foam molding.
  • the polyurethane foam has an advantage of excellent elasticity and resilience, but because the specific gravity (> 0.3g / cc) is high, if a lot of foaming to lower the specific gravity, the surface of the skin is not good, the physical properties and appearance is bad.
  • Patent Document 1 Published Patent Publication No. 10-2016-0114274 (name of the invention: a midsole molding apparatus and a midsole manufactured by the molding apparatus. Publication date: October 05, 2016)
  • Patent Document 2 Published Patent Publication No. 10-2011-0115195 (Invention name: Midsole manufactured from synthetic resin foam beads. Publication date: October 21, 2011)
  • Patent Document 3 Published Patent Publication No. 10-2013-0096660 (Invention name: shoe midsole manufacturing method and shoe midsole using the same. Publication date: August 30, 2013)
  • Patent Document 4 Published Patent Publication No. 10-2016-0061463 (Invention name: Midsole having a shock-absorbing and rebound elasticity function and a manufacturing method thereof. Publication date: June 01, 2016)
  • the present invention is to solve the problems of the prior art as described above, to provide a polyurethane midsole for shoes and a method of manufacturing the same so that the weight of the shoe can be implemented while maintaining the elasticity and cushioning feeling when manufacturing the midsole with polyurethane foam
  • the purpose is.
  • Polyurethane midsole for shoes according to the present invention is composed of a low specific gravity polyurethane foam, the bottom surface and the circumferential surface of the midsole or optionally the upper surface of the midsole frozen with a polymer compatible with polyurethane or polyurethane It is characterized in that the film made of Roy resin is wrapped.
  • Polyurethane midsole for shoes according to the present invention is composed of a low specific gravity polyurethane foam, the bottom and circumferential surface of the midsole or optionally the upper surface of the midsole is a film made by compounding silica or inorganic material that is wrapped It features.
  • Polyurethane midsole for shoes according to the present invention is composed of a low specific gravity polyurethane foam, characterized in that the bottom surface and the circumferential surface of the midsole or optionally the upper surface of the midsole is made of TPU yarn wrapped. .
  • Method for producing a polyurethane midsole for shoes is a film made of a polymer compatible with polyurethane or polyurethane and alloy or silica or inorganic material in the form of a midsole through vacuum forming, and then the midsole It is put into a mold for manufacturing, put a PU preform (Free Foam) of the semi-finished form of the block mold PU foam 3D cut molded thereon, it is characterized by consisting of a process of manufacturing a midsole by compression molding it.
  • PU preform Free Foam
  • Method for producing a polyurethane midsole for shoes according to the present invention is made of a TPU yarn woven fabric in the form of a midsole through vacuum molding, and then put it in a mold for manufacturing the midsole, and the semi-finished product 3D cut molding a block mold PU foam thereon After placing the PU preform (Free Foam) of the form, it is characterized by consisting of a process of manufacturing a midsole by compression molding.
  • Method for producing a shoe polyurethane polyurethane comprises the steps of preparing a fabric made of a film or TPU yarn made by compounding a polymer compatible with polyurethane or polyurethane and alloy or silica or inorganic material; 3) cutting the PU foam made of low specific gravity polyurethane to produce a midsole-shaped semi-finished PU preform; wrapping the film or fabric on the outside of the PU preform by vacuum molding; Put the PU preform into a compression molding mold, it is characterized in that consisting of a step of producing a polyurethane midsole by compression molding.
  • the present invention is a method of manufacturing a polyurethane midsole for shoes, the inside is composed of a low specific gravity polyurethane foam and the outside is a method of wrapping with a film made of a polymer and alloy resin compatible with polyurethane or polyurethane By molding, it is possible to realize the lightweight of the shoes as well as to maintain the elasticity and cushioning of the polyurethane foam as it is.
  • the present invention when manufacturing a shoe polyurethane midsole, the inside is composed of a low specific weight polyurethane foam and the outside is formed by the method of wrapping by a film made by compounding silica or inorganic material to realize the above-described effect
  • a film made by compounding silica or inorganic material to realize the above-described effect
  • the present invention when manufacturing the shoe polyurethane midsole, the inside is made of a low specific gravity polyurethane foam and the outside is molded by a method of wrapping with a fabric made of TPU yarn, the molding of the above-described effect, of course, molding When the air escapes during the bubble (bubble) can be prevented, and when weaving into a variety of shapes when making a fabric from TPU yarns, there is an effect that can be wrapped in a variety of patterns.
  • FIG. 1 is a view sequentially showing a method of manufacturing a polyurethane midsole for shoes according to an embodiment of the present invention.
  • Figure 2 is a view showing in detail the process to manufacture a PU preform (Free Foam) shown in Figure 1 in detail.
  • FIG. 3 is a view illustrating a method of processing a film or fabric shown in FIG. 1 in a midsole form by a vacuum forming method and a method of manufacturing a polyurethane midsole by compression molding with a PU preform using the same;
  • FIG. 4 is a view showing a film in the form of a midsole made by the vacuum forming method shown in FIG.
  • Figure 5 is a view showing a cross-section of the polyurethane midsole for shoes produced by the method shown in FIG.
  • Figure 6 is a view showing sequentially a manufacturing method of a shoe polyurethane midsole according to another embodiment of the present invention.
  • FIG. 7 is a view showing the shape of the PU preform 70 made in the PU preform manufacturing step (S204) shown in FIG.
  • FIG. 8 schematically shows the configuration of the vacuum molding machine 50 used when the vacuum forming wrapping step S206 shown in FIG. 6 is performed.
  • 15 and 16 are views illustrating a state in which the film 80 is wrapped along the upper surface and the rim surface of the PU preform 70 according to the vacuum forming wrapping step S206 shown in FIGS. 9 to 14. .
  • FIG. 25 is a view showing the compression molding step (S208) and PU midsole manufacturing step (S210) shown in FIG.
  • 26 and 27 are views showing the shape of the polyurethane midsole for shoes manufactured by the method shown in FIG.
  • the present invention constitutes a low specific gravity (preferably low specific gravity of about 0.1 g / cc) polyurethane foam inside, and the polymer is compatible with a thin film or fabric, preferably polyurethane or polyurethane, outside And a method of manufacturing a shoe midsole and a method of manufacturing the midsole by wrapping with a film made of an alloy (alloy) or a fabric made of TPU yarn, and then foaming it.
  • a low specific gravity preferably low specific gravity of about 0.1 g / cc
  • the shoe midsole (Midsole) in the polyurethane foam
  • a specific gravity equal to or less than the EVA foam
  • the present invention constitutes a polyurethane foam having a low specific gravity (preferably, a low specific gravity of about 0.1 g / cc) in place of the conventional integral polyurethane foam midsole, and the outside is a thin film, preferably Technical composition of a shoe midsole and a method of manufacturing the midsole by wrapping with a film made of polyurethane or a polymer compatible with polyurethane and an alloy of an alloy, and then foaming the same Suggesting.
  • a low specific gravity preferably, a low specific gravity of about 0.1 g / cc
  • the present invention when manufacturing a shoe polyurethane midsole, the inside is composed of a low specific weight polyurethane foam and the outside is wrapped with a film prepared by compounding (compound) silica or inorganic materials in addition to the above-mentioned resin
  • the present invention proposes a technical configuration that can prevent the film from flowing down or melting even at a high temperature and pressure during press molding.
  • the present invention is to produce a polyurethane midsole for shoes, the inside is composed of a low specific weight polyurethane foam and the outside is wrapped with a fabric made of TPU yarn (preferably, the inventors patented TPU yarn)
  • TPU yarn preferably, the inventors patented TPU yarn
  • FIG. 1 is a method for manufacturing a polyurethane midsole for shoes according to an embodiment of the present invention, specifically, low specific gravity polyurethane foam inside, wrapped outside the yarn made using a thin film or TPU yarn ( The drawing shows how to prepare a polyurethane midsole by wrapping and compression molding it.
  • Method for producing a polyurethane midsole comprises the steps of mixing the polyol and isocyanate (S100), mixing them and molding into a PU foam (S102), aging the PU foam (S104), aging 3D cutting of the molded PU foam (Block Molding Foam) to PU refining (hereinafter referred to as "PU Free Foam") (S106), in addition to forming a film by a vacuum molding machine
  • Step (S108) comprises a step of making a film in the shape of a midsole, and the film and PU preforms are sequentially put into a compression molding mold and then compression molded to produce a polyurethane midsole (S110), S112.
  • FIG. 2 is a view sequentially showing a process of manufacturing polyurethane foam block (Block Molding), preferably PU preform (Free Foam) in the method of manufacturing a polyurethane midsole for shoes according to the present invention
  • FIG. 3 is a view illustrating a process of manufacturing a film in a midsole shape by using a conventional vacuum forming method and compressing the same using a conventional compression molding mold together with a PU preform.
  • a polyol and an isocyanate are mixed in a conventional method and a compounding ratio (S100), and then mixed for 10 to 15 seconds to prepare a two-component polyurethane, and then the two-component polyurethane stock solution To put in a mold, it is foam molded to prepare a PU foam (S102).
  • the foamed PU foam has a specific gravity of 0.1 g / cc and belongs to a low specific gravity.
  • the PU foam in the mold 30 is aged for 24 hours (S104).
  • the matured PU foam (Block Molding Foam) using a conventional 3D cutting machine to make a semi-finished product in a desired form of free foam, preferably midsole shape (S106).
  • the semi-finished product made by the 3D cutting machine is called PU preform (Free Foam, 10a) in the present invention.
  • the film is molded into a midsole shape using a vacuum molding machine.
  • the film of the polyurethane material is vacuum-molded in order to protect the outer surface of the polyurethane midsole. It is molded into the shape of midsole like 4 (hereinafter referred to as 'film 20').
  • the film 20 is a film made of a resin (Alloy) and a polymer compatible with polyurethane or polyurethane.
  • the alloy alloyed with a polymer compatible with polyurethane is made of an alloy made of polyurethane resin with engineered plastics such as ABS, POM, SBS, and SEBS, and synthetic rubber such as SBS, SEBS, NBR, and BR.
  • the resin alloy serves to reduce the elasticity of the film 20 so that the angle is well formed in the midsole shape as shown in FIG.
  • the film 20 when the film 20 is manufactured in the press molding by compounding (compound) the silica or inorganic materials in addition to the resins shown above, specifically in the production of the midsole using an extrusion molding mold for producing midsole At high temperatures and pressures, the film 20 easily flows out of the PU preform 10a to prevent it from collapsing or melting. That is, when the film 20 is manufactured, an inorganic material such as silica, calcium carbonate, and talc is used as a reinforcing agent in combination with polyurethane to achieve the above effects.
  • Example 2 shows the progress of the test when using the silica as a reinforcing agent when manufacturing the film 20, it will be described in detail.
  • silica content and test results to be presented below can be equally applied to the first and second films 80 and 90 described in Example 2 will be omitted in Example 2 below .
  • Base TPU film WP-TPU (TPU / ABS Ally)
  • Testgrade MFI 200 ° C, 2.16 kg
  • Tfb Melt viscosity Nano Silica Masterbatch Content PU foam and compression molding after skin condition (g / 10min) (°C) (Pa.s) 180 °C 185 °C WP-TPU-1 15.82 162.3 34580 10010 0phr Skin melts and collapses, causing skin surface to boil.
  • WP-TPU-2 13.22 164.4 36860 11440 3phr Skin melts and collapses WP-TPU-3 10.45 166.8 41950 12530 5phr Skin does not collapse and is good WP-TPU-4 7.35 168.2 43380 14230 10phr Skin does not collapse and is good WP-TPU-5 4.23 175.4 56570 17930 20phr Skin is not broken and good, adhesion is not good.
  • the appropriate input content of the silica masterbatch (30% concentrated content) is preferably 5phr ⁇ 10phr, when 20phr is added, the product Tfb is high, the skin does not melt well during the molding press does not adhere well Did.
  • the polyurethane midsole of the present invention by wrapping the PU preform (10a) with a fabric made using a TPU yarn in addition to the film 20 prepared by adding the resin alloy and silica or inorganic materials ( 30) can be prepared.
  • a fabric made of TPU yarns as described above, air can flow out between the spaces (holes) formed in the fabric itself during press molding, thereby preventing bubbles from being generated between the PU preform 10a and the fabric.
  • the fabric is made of the TPU yarn can be woven in various shapes, which has the advantage of forming a variety of patterns when wrapping the fabric on the PU preform (10a),
  • the TPU yarn used in the present invention is preferably to apply the technology patented by the present inventor, it is also possible to use a fabric made using a general TPU yarn.
  • the TPU yarn patented by the inventors of the present application No. 10-1341055, No. 10-1341054, No. 10-1318135, No. 10-1530149, No. 10-1561890 It is preferable to use a TPU yarn manufactured with the technical construction disclosed in the above, and in particular, a TPU yarn prepared by compounding silica or nanosilica.
  • the film 20 made in the shape of the midsole as shown in FIG. 4 is placed in the lower mold of the conventional compression molding mold for producing a midsole, and a low specific weight of the PU preform (10a) is put thereon to be implemented in the present invention by The polyurethane midsole 30 is prepared.
  • a low specific gravity (0.1 g / cc) polyurethane foam 10 is formed therein, and includes a bottom surface and an outer circumferential surface or an upper surface of the polyurethane foam 10. The entire surface is wrapped with a film (20). At this time, the film 20 can be replaced with a fabric made using a TPU yarn as seen above.
  • the polyurethane foam 10 is made of 3D cutting (PU preform: Free Foam, 10a) made by 3D cutting (PU) foam block (foam block) processed in a block mold (block mold) in a desired form It is made by compression molding.
  • the polyurethane midsole 30 of the present invention can realize the lightweight of the shoes as a low specific gravity of the EVA level with elasticity and resilience, as well as wrap the fabric made using a film or TPU yarn on the outside
  • film decoration is possible and various patterns can be formed in the midsole.
  • the foam to enter the inside of the polyurethane midsole according to the present invention is not necessarily PU foam, EVA foam or polyolefin foam (Polyolefin foam) is also possible. In this case, however, physical properties may be degraded.
  • FIG. 6 is a method for manufacturing a polyurethane midsole for shoes according to another preferred embodiment of the present invention, specifically, a low specific gravity polyurethane foam inside and wrapped with a fabric made using a thin film or TPU yarn on the outside (wrapping) and compression molding it is a view showing a method for producing a polyurethane midsole.
  • the method of manufacturing a polyurethane midsole according to the present invention may include forming a PU foam in a conventional method (S200), and processing the PU foam into a PU preform by 3D cutting.
  • Step S204 in addition to manufacturing the film shown in Example 1 described above, or manufacturing a fabric using a TPU yarn (200), the film (or fabric made of TPU yarn) and PU preform
  • the vacuum molding step (S206) the wrapped PU preform is put into a conventional compression molding mold and compression molding to produce a polyurethane midsole to be implemented in the present invention (S208, S210).
  • Polyol and isocyanate are mixed to prepare a two-component polyurethane, which is then poured into a mold, foamed, and then matured to have a low specific gravity (preferably, a low specific gravity of about 0.1 g / cc). ).
  • the PU foam is processed into a desired shape using a conventional 3D cutting machine, preferably in a midsole shape as shown in FIG. 7.
  • the semi-finished product is referred to as a PU preform (Free Foam: 70).
  • the present invention when manufacturing the polyurethane midsole 300 as shown in Figure 26 and 27, for the purpose of protecting the outer surface of the midsole 300 to produce a film (80,90) or fabric and the polyurethane The entire bottom or circumferential surface or upper surface of the midsole 300 is wrapped.
  • the film (80,90) or the fabric is to maintain the elasticity and cushioning of the polyurethane foam while maintaining the weight of the shoe as seen above when manufacturing the polyurethane midsole (300).
  • Such films 80 and 90 are made of polyurethane or a resin that is alloyed with a polymer compatible with the polyurethane.
  • the polyurethane resin is engineered to ABS, POM, SBS, SEBS, etc. It is made of plastic, synthetic rubber such as SBS, SEBS, NBR and BR and alloyed resin.
  • Such a composition reduces the elasticity of the films 80 and 90 so that the films 80 and 90 are in close contact with the PU preform 70 as shown in FIGS. .
  • the films 80 and 90 may be manufactured by using a reinforcing agent in addition to the resin alloy.
  • a reinforcing agent for example, silica or an inorganic material (for example, inorganic materials such as calcium carbonate and talc) may be used. This reinforcement prevents the film 80,90 from flowing down easily, even at high temperatures and pressures, and collapse or melt away (i.e., the film does not come out of contact with the PU preform).
  • the PU preform 70 may be wrapped with a fabric made using TPU yarns in addition to the films 80 and 90 manufactured using a resin alloy, silica, or an inorganic material. Wrapping using a fabric made of such TPU yarns prevents air from escaping between the spaces (or holes) formed in the fabric itself during press molding, so that bubbles do not occur between the PU preform 70 and the wrapped fabric. It is also possible to wrap various patterns.
  • the TPU yarn may use the patented technology of the present inventors as described above, or may use a general TPU yarn.
  • the vacuum forming wrapping step S206 is a step of wrapping the film or fabric made in the film or fabric manufacturing step S22 on the PU preform 70 made in the above-described PU preform manufacturing step S204.
  • Lapping method proposed in the present invention is 1) a method of lapping the film only on the bottom surface and the rim surface of the PU preform, 2) a method of wrapping with a fabric made of TPU yarn only on the bottom and rim surface of the PU preform, 3) PU preform Wrapping the entire surface of the film with the film (ie, wrapping the entire surface over the top surface, including the bottom and edge), 4) wrap the entire surface of the PU preform with a fabric made of TPU yarn.
  • the vacuum molding machine 50 when wrapping the film on the entire surface of the PU preform 70, that is, when wrapping the first film 80 and the second film 90 on the entire surface of the PU preform 70, respectively,
  • the vacuum molding machine 50 is used, and the technical configuration of the vacuum molding machine 50 is as shown in FIG. Referring to FIG. 8, the vacuum molding machine 50 is generally provided with a wooden mold 52 and a vacuum suction duct 56 while maintaining a constant interval to simultaneously wrap a pair of PU preforms 70.
  • a fixing frame 54 for fixing the first and second films 80 and 90 elastically and flatly above the die 52 is provided.
  • a vacuum suction duct 56 is connected to the bottom of the die 52, and the vacuum suction duct 56 is connected to a general vacuum device (not shown).
  • the PU preform 70 is placed on the wooden mold 52 of the vacuum molding machine 50, and the first film 80 is fixed to the fixing frame 54.
  • the first film 80 is preferably fixed to the fixing frame 54 while having a tension.
  • the wooden mold 52 on which the PU preform 70 is placed is lifted up to be in contact with the first film 80, and the PU preform 70 pushes the first film 80 upward. As it rises, the first film 80 is convexly expanded.
  • the PU preform 70 sags downward with the first film 80 adhered thereto. It becomes. Subsequently, after separating the PU preform 70 from the fixing frame 54 and removing the remaining first film 80 that is not adhered to the PU preform 70 (finishing process), the PU as shown in FIGS. 15 and 16. The first film 80 is adhered only to the upper surface and the edge surface of the preform 70.
  • the PU preform 70 is placed on the wooden mold 52 of the vacuum molding machine 50 as shown in FIG. 17.
  • the upper surface of the PU preform 70 that is, the portion to which the first film 80 is attached, faces downward.
  • the PU preform 70 is placed on the die 52.
  • the fixing frame 54 is fixed to the second film 90 flat to have a tension.
  • the wooden mold 52 on which the PU preform 70 is placed is lifted up to be in contact with the second film 90, and the PU preform 70 pushes the second film 90 upward. Climb up to allow the second film 90 to expand.
  • the second film 90 forms a bottom surface and an edge surface of the PU preform 70. Accordingly.
  • the PU preform 70 sags downward with the second film 90 bonded thereto. It becomes. Subsequently, after separating the PU preform 70 from the fixing frame 54 and removing the remaining second film 90 which is not adhered to the PU preform 70 (finishing treatment), the PU preform 70 is shown in FIG. 23.
  • the second film 90 is bonded to the bottom surface and the edge surface of the). That is, as shown in FIG. 24, the first film 80 is adhered to the upper surface and the edge of the PU preform 70, and the second film 90 is adhered to the bottom and the edge of the PU preform 70.
  • the first and second films 80 and 90 are wrapped on the entire surface of the PU preform 70.
  • the edge surfaces of the PU preform 70 may be overlapped and wrapped with the first and second films 80 and 90, and the first and second films 80 and 90 do not overlap with each other to form a boundary surface and the PU preform 70. It can be wrapped on the edge surface of the).
  • the PU preform 70 having the first and second films 80 and 90 wrapped thereon is placed on the lower mold 64 of the compression molding mold 60 for manufacturing a midsole. ) And then compression molding it to produce a polyurethane midsole 300 to be implemented in the present invention.
  • the polyurethane midsole 300 of the present invention manufactured by the above-described method has a low specific gravity (0.1 g / g) as shown in FIGS. 26 and 27.
  • cc) of PU preform (70: polyurethane foam) the entire surface including the bottom surface, the circumferential surface, and the upper surface of the PU preform 70 is wrapped with the first and second films (80, 90) have.
  • the first and second films 80 and 90 may be wrapped only on the bottom surface and the edge surface of the PU preform 70 (polyurethane foam).
  • the polyurethane midsole 300 illustrated in FIG. 26 has a pattern formed along a circumferential surface because a pattern is formed on the lower mold 64 of the compression molding mold 60.
  • polyurethane midsole of the present invention prepared by the method of Examples 1 and 2 as described above can be seen that the physical properties are superior to the conventional EVA midsole and polyurethane midsole is shown in Table 2 specifically. .
  • TYPE Wrapper Midsole (PU base) of the present invention Conventional EVA Midsole Conventional PU Midsole Product Compression processing
  • EVA Injection processing EVA Ether Type Hardness (Asker C) 42-47 50-55 51-55 38-42
  • Tensile (kgf / cm2) Min 15 Min 20 Min 20 Min 10 Elongation (%) Min 200 Min 250 Min 250 Min 175 Split Tear (kg / cm) Min 2.0 Min 2.5 Min 2.5 Min 0.8 Tear (kg / cm) Min 10 Min 10 Min 5 Shrinkage (%) Max 1.0 Max 2.0 Max 2.0 Max 1.0 Specific Gravity (g / cc) 0.20-0.23 0.22-0.25 0.20-0.23 0.34-0.38 Compression set (%) Max 20 Max 80 Max 60 Max 20 Ball rebound Min 55 Min 50 Min 50 Min 55
  • the polyurethane midsole of the present invention has a specific gravity similar to that of the conventional EVA midsole, but shows excellent compression set results compared to the high compression set, which is a weak point of the EVA midsole. You can see that it has only advantages.
  • the polyurethane midsole 300 of the present invention can realize the weight of the shoe as a low specific gravity of the EVA level with elasticity and resilience, because the fabric made of a film or TPU yarn is wrapped (wrapping) on the outside Decoration is possible and various patterns can be formed on the midsole.
  • an EVA foam or a polyolefin foam may be used even if the foam is not necessarily a PU foam. In this case, however, physical properties may be degraded.

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  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

L'invention concerne une semelle intercalaire pour une chaussure et son procédé de fabrication, la semelle intercalaire, comme alternative aux semelles intercalaires de mousse de polyuréthane classiques, formées en une seule pièce, étant fabriquée en formant une mousse de polyuréthane à faible densité spécifique (de préférence ayant une faible densité spécifique d'environ 0,1 g/cc) à l'intérieur, et en enveloppant l'extérieur avec un film ou un tissu mince, de préférence un film formé d'une résine alliée avec du polyuréthane ou un polymère compatible avec le polyuréthane, ou un tissu formé en fil de TPU, puis en faisant mousser ce dernier.
PCT/KR2017/002048 2016-12-28 2017-02-24 Semelle intercalaire en polyuréthane pour chaussure et son procédé de fabrication WO2018124385A1 (fr)

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KR20160180574 2016-12-28
KR10-2016-0180574 2016-12-28
KR1020170022676A KR20180076987A (ko) 2016-12-28 2017-02-21 신발용 폴리우레탄 미드솔 및 그 제조방법
KR10-2017-0022676 2017-02-21

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Cited By (4)

* Cited by examiner, † Cited by third party
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US11564443B2 (en) 2019-08-02 2023-01-31 Nike, Inc. Textiles and articles and processes for making the same
US11998080B2 (en) 2020-07-31 2024-06-04 Nike, Inc. Textiles and articles and processes for making the same
CN115194995A (zh) * 2021-04-09 2022-10-18 浙江华峰新材料有限公司 一种生产鞋底底片的方法

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