US20080028635A1 - Three-Dimensional Cross-Linked Foam for Uppers of Shoes - Google Patents

Three-Dimensional Cross-Linked Foam for Uppers of Shoes Download PDF

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Publication number
US20080028635A1
US20080028635A1 US11/813,086 US81308605A US2008028635A1 US 20080028635 A1 US20080028635 A1 US 20080028635A1 US 81308605 A US81308605 A US 81308605A US 2008028635 A1 US2008028635 A1 US 2008028635A1
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United States
Prior art keywords
cross
linked foam
inner cavity
uppers
foam according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/813,086
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English (en)
Inventor
Jang Park
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Individual
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Individual
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Publication of US20080028635A1 publication Critical patent/US20080028635A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/02—Uppers; Boot legs
    • A43B23/04—Uppers made of one piece; Uppers with inserted gussets
    • A43B23/042—Uppers made of one piece
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/06—Footwear with health or hygienic arrangements ventilated
    • A43B7/08—Footwear with health or hygienic arrangements ventilated with air-holes, with or without closures
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D11/00—Machines for preliminary treatment or assembling of upper-parts, counters, or insoles on their lasts preparatory to the pulling-over or lasting operations; Applying or removing protective coverings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/08—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles using several expanding or moulding steps
    • 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
    • B29D35/0054—Producing footwear by compression moulding, vulcanising or the like; Apparatus therefor
    • 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
    • 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
    • B29D35/04—Producing footwear made in one piece using a moulding technique, e.g. by injection moulding or casting having multilayered parts
    • 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
    • B29D35/126—Uppers
    • 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
    • B29D35/146—Uppers

Definitions

  • the present invention relates to a cross-linked foam, and more specifically a three-dimensional cross-linked foam for uppers of shoes that has a shape corresponding to a last and has at least one inner cavity structure therein.
  • the shoes that we usually wear for protecting the feet from the external circumstance mainly comprise soles and uppers.
  • the uppers of the shoes directly contact the feet and thus increases a feeling of unity.
  • the uppers play a primary role in protecting the feet from an external impact applied to the feet.
  • the uppers are usually formed using a last 10 that has a three-dimensional shape corresponding to completed uppers as shown in FIGS. 13 to 14 . Because the last 10 has a three-dimensional shape and the raw material for the uppers are planar, a measurement of each portion of the last 10 must be taken and then converted to a measurement that can be applied to the planar raw material for the uppers such as cloth, leather and various resins, etc. That is, the last 10 has a three-dimensional measurement as shown in the figures in alphabet “a”,“b”, “c”, “d” and “e” and these measurement must be converted to a planar measurement that can be applied to the raw material for the uppers.
  • the raw material is cut according to the converted measurement and then sewed or attached together. The sewed or attached material is put into close contact with the outer surface of the last 10 and then undergoes a heating and an ageing processes to obtain a completed uppers.
  • the completed uppers acquired by the above-mentioned method have following disadvantages.
  • many components of the completed uppers basically has a thin planar shape and is formed of soft material, a stability of a shape and a dimension is low compared with the soles of the shoes that is formed by a molding die.
  • planar raw materials once transformed into a three-dimensional shape, it is difficult to keep the completed uppers in a three-dimensional shape.
  • the uppers must primarily protect the feet from the external impact, it should have a supporting property and a good fitting.
  • the uppers of the related art has been usually made of the thin, planar and soft materials.
  • various shock-absorbing material or protector may be put into the uppers or attached to the uppers during a sewing process.
  • an applicable range of this method is very narrow considering that the upper is formed of thin planar material and has a smaller thickness than the soles of the shoe.
  • shock-absorbing materials having a relatively big volume are inserted or attached to a certain portion of the uppers, the fitting feeling between the uppers and the feet becomes bad and a naturally curved appearance of the shoes also becomes bad even though a shock-absorbing property of the certain portion of the uppers is improved.
  • the film or the sheet having the function of air ventilation and waterproof is attached to a surface of the uppers or additional built-in uppers formed of the film or the sheet having the function of air ventilation and waterproof are formed in a shape of the sewed uppers and then put into the sewed uppers.
  • this method makes the total manufacturing process of the shoes complex and accordingly increases the manufacturing cost.
  • an object of the present invention is to provide a three-dimensional cross-linked foam for uppers of shoes that can maintain a dimension and a shape for a long time because the cross-linked foam is formed according to a shape of a last.
  • Another object of the present invention is to provide a three-dimensional cross-linked foam for uppers of shoes that can increase fitting feeling and supporting property of the shoes without attaching additional components to the uppers.
  • Another object of the present invention is to provide a three-dimensional cross-linked foam for uppers of shoes that can naturally circulate air between the inside and outside of the shoes and have a proper function of waterproof.
  • Another object of the present invention is to provide a three-dimensional cross-linked foam for uppers of shoes that can differentiate a hardness and design of each portion of the shoes.
  • a three-dimensional cross-linked foam for uppers of shoes comprises a cross-linked foam body having a shape corresponding to a last; and at least one inner cavity structure formed in the cross-linked foam body, the inner cavity structure defined by an internally formed surface of the cross-linked foam body.
  • plural inner cavity structures may be formed in the cross-linked foam body.
  • all or some of the plural inner cavity structures may be connected to each other.
  • the plural inner cavity structures may form groups consisting of connected inner cavity structures.
  • cross-linked foam may further comprise an air passage connected to at least one of the plural inner cavity structures.
  • At least one of the plural inner cavity structures may be filled with gas.
  • unevenness may be formed on the cross-linked foam body.
  • a three-dimensional cross-linked foam for uppers of shoes comprises a cross-linked foam body having a shape corresponding to a last; at least one inner cavity structure formed in the cross-linked foam body, the inner cavity structure defined by an internally formed surface of the cross-linked foam body; and filler introduced into the inner cavity structure.
  • plural inner cavity structures are formed in the cross-linked foam body and all of the plural inner cavity structures are filled with the filler.
  • plural inner cavity structures may be formed in the cross-linked foam body and at least one of the plural inner cavity structures is filled with the filler.
  • all or some of the plural inner cavity structures may be connected to each other.
  • the plural inner cavity structures may form groups consisting of connected inner cavity structures.
  • cross-linked foam may further comprise an air passage connected to at least one of the plural inner cavity structures.
  • the filler may include at least one material selected from gas, liquid and same material as or different material from the cross-linked foam body.
  • the filler may be introduced into a housing that is put into close contact with the internally formed surface.
  • unevenness may be formed on the cross-linked foam body.
  • a three-dimensional cross-linked foam for uppers of shoes comprises a cross-linked foam body having a shape corresponding to a last.
  • At least one air passage may be formed in the cross-linked foam body.
  • unevenness may be formed on the cross-linked foam body.
  • the cross-linked foam for uppers of shoes is formed in a three-dimensional shape according to the shape of the last having a complex curved surface so that dimension and shape stabilities can be provided to the shoes.
  • the cross-linked foam of the present invention has at least one inner cavity structure therein formed simultaneously with the cross-linked foam and the inner cavity may have gas therein at a certain pressure, fitting feeling and supporting property is greatly improved.
  • the cross-linked foam of the present invention can more perfectly protect the feet from an external impact because at least one of the inner cavity structures can be filled with the filler having a required property.
  • the cross-linked foam of the present invention can provide air ventilation and waterproof properties to the shoes so that air in the shoes can effectively discharged out of the shoes while moisture can not permeates the shoes.
  • FIG. 1 is illustrating a three-dimensional cross-linked foam for uppers of shoes according to an embodiment of the present invention
  • FIGS. 2 to 3 are cross-sectional views of the three-dimensional cross-linked foam taken along lines A-A′ and B-B′ of FIG. 1 , respectively;
  • FIG. 4 is a cross-sectional view of the three-dimensional cross-linked foam when the inner cavity structure of FIG. 2 is filled with filler;
  • FIG. 5 is a cross-sectional view of the three-dimensional cross-linked foam when the inner cavity structure of FIG. 3 is filled with filler;
  • FIG. 6 is a cross-sectional view of the three-dimensional cross-linked foam when a housing filled with filler is inserted into the inner cavity structure of FIG. 2 ;
  • FIG. 7 is illustrating a three-dimensional cross-linked foam for uppers of shoes according to another embodiment of the present invention.
  • FIGS. 8 to 9 are cross-sectional views of the three-dimensional cross-linked foam taken along lines C-C′ and D-D′ of FIG. 7 , respectively;
  • FIG. 10 is illustrating a three-dimensional cross-linked foam for uppers of shoes according to another embodiment of the present invention.
  • FIGS. 11 to 12 are cross-sectional views of the three-dimensional cross-linked foam taken along lines E-E′ and F-F′ of FIG. 10 , respectively;
  • FIGS. 13 and 14 are illustrating a side and a bottom of a last.
  • FIG. 1 is illustrating a three-dimensional cross-linked foam for uppers of shoes according to an embodiment of the present invention and FIGS. 2 to 3 are cross-sectional views of the three-dimensional cross-linked foam taken along lines A-A′ and B-B′ of FIG. 1 , respectively.
  • the cross-linked foam 100 for uppers of shoes mainly comprises a cross-linked foam body 120 and inner cavity structures 142 and 146 formed simultaneously with the cross-linked foam body in a unity.
  • the cross-linked foam body 120 is obtained by various cross-linked foaming methods known in the field and has a shape corresponding to a curved surface of a last 10 of FIGS. 13 to 14 .
  • An inner surface 180 of the cross-linked foam body 120 may desirably have a three-dimensional shape corresponding to an outer curved surface of the last 10 . Portions of the inner surface 180 corresponding to fore-foot, middle-foot and or rear-foot may desirably have a same shape as the fore-foot “a”, middle-foot “b” and “c” or rear-foot “d” of the last 10 , respectively.
  • the inner cavity structures 142 and 146 are defined by an internally formed surface 132 of the cross-linked foam body 120 . Though the inner cavity structure 142 and 146 may desirably be formed along a curved surface of the cross-linked foam body 120 as shown in FIGS. 2 and 3 , a shape of the inner cavity structure is not confined to a certain shape.
  • the inner cavity structure 142 and 146 provides stability and supporting property to the cross-linked foam body 120 and improves a fitting feeling of the shoes. Accordingly, the cross-linked foam body 120 itself can effectively protect the feet without additional components attached.
  • Unexplained elements having reference numbers 122 and 124 are covering portions of the inner cavity structures 142 and 146 , respectively. Though the covering portions 122 and 124 are protruded over a surface of the cross-linked foam body 120 in FIGS. 2 and 3 , they may be leveled with the surface of the cross-linked foam body 120 .
  • the shape, number and position of the inner cavity structure can be controlled under various conditions.
  • the plural inner cavity structures may not be connected to each other or all or some of them may be connected to each other.
  • the plural inner cavity structures may form groups consisting of connected inner cavity structures, that is, the plural inner cavity structures may consist of plural groups in each of which adjacent inner cavity structures among the plural inner cavity structures are connected to each other.
  • the cross-linked foam body 120 has inner and outer air passages 196 and 192 connected to at least one of inner cavity structures so that air can circulates in and out of the cross-linked foam body 120 as in FIG. 3 .
  • the position, number and a selection of the inner cavity structure to be connected to the air passage are not limited and changeable under various conditions.
  • a valve may be connected to the air passages 192 and 196 to control an amount of the air flowing in and out of the cross-linked foam body 120 .
  • the inner cavity structure 142 and 146 itself has a superior shock-absorbing property and an elasticity, those properties can be more increased by injecting gas selected from various known gases into all or some of the inner cavity structures.
  • unevenness may further be formed on the cross-linked foam body 120 at a position corresponding to an instep of fore-foot to which a repeated bending stress is applied and to a heel portion that should protect the feet from an external impact.
  • FIG. 4 is a cross-sectional view of the three-dimensional cross-linked foam when the inner cavity structure of FIG. 2 is filled with filler
  • FIG. 5 is a cross-sectional view of the three-dimensional cross-linked foam when the inner cavity structure of FIG. 3 is filled with filler.
  • Each of the inner cavity structures 142 and 146 are filled with different materials, i.e., fillers 162 and 166 , having different physical properties to increase the fitting feeling of the shoes and more effectively protect the feet from the external impact.
  • a phase and a kind of the filler 162 and 166 is not limited and can be selected from various materials in a phase of gas, liquid or solid. Besides, an injection molded material having a certain shape may be selected as the filler. A same filler may be filled into connected inner cavity structures or a same or different material may be injected into the group consisting of connected inner cavity structures connected to the adjacent inner cavity structures.
  • FIG. 6 is a cross-sectional view of the three-dimensional cross-linked foam when a housing filled with filler is inserted into the inner cavity structure of FIG. 2 . Because an independent housing 172 is filled with the filler 162 and then the housing 172 is inserted into the inner cavity structure 142 , the filler 162 can be more safely and perfectly introduced into the inner cavity structure 142 regardless of the shape and phase.
  • a material of the housing 172 is not limited as long as the housing can be properly introduced into the inner cavity structure 142 and make a close contact with the internally formed surface 132 of the cross-linked foam body 120 , it may desirably be thermoplastic polyurethane (TPU) that is widely used as a material for various kinds of housings.
  • TPU thermoplastic polyurethane
  • FIG. 7 is illustrating a three-dimensional cross-linked foam for uppers of shoes according to another embodiment of the present invention and FIGS. 8 to 9 are cross-sectional views of the three-dimensional cross-linked foam taken along lines C-C′ and D-D′ of FIG. 7 , respectively.
  • three groups of inner cavity structures are formed in the cross-linked foam body 220 at different portions of the cross-linked foam body 220 .
  • the reference numbers 222 , 224 and 226 are covering portions of the three groups of inner cavity structures. Inner cavity structures belonging to groups corresponding to the covering portions 224 and 226 are connected to other inner cavity structures in the same group.
  • Inner and outer air passages 296 and 292 are connected to the inner cavity structure 242 and the inner cavity structure 262 is filled with filler 246 . Though it is not shown in the figures, the inner cavity structure formed at a position corresponding to the covering portion 222 of a heel portion of the uppers may be filled with the gaseous material.
  • the inner cavity structure is formed at a portion of the uppers requiring a fitting feeling and a supporting property and filled with the filler having a required physical property. Accordingly, the fitting feeling and the supporting property can be greatly improved.
  • the cross-linked foam body 220 can have a function of ventilation by forming the air passages connected to the inner cavity structure.
  • the cross-linked foam body can have a waterproof function by controlling positions of the air passages 292 and 296 so that the air can freely circulates in and out of the cross-linked foam body while the moisture cannot infiltrate into the cross-linked foam body.
  • the waterproof function is provided by forming the inner air passage 296 on upper portion of the inside of the cross-linked foam for uppers and forming the outer air passage 292 on lower portion of the outside of the cross-linked foam for uppers.
  • FIG. 10 is illustrating a three-dimensional cross-linked foam for uppers of shoes according to another embodiment of the present invention and FIGS. 11 to 12 are cross-sectional views of the three-dimensional cross-linked foam taken along lines E-E′ and F-F′ of FIG. 10 , respectively.
  • the inner surface 380 of the three-dimensional cross-linked foam 300 is naturally shaped after the outer curved surface of the last 10 of FIGS. 13 and 14 .
  • Inner and outer air passages 396 and 392 are formed in the cross-linked foam body 320 so that air can freely circulate between the inside and the outside of the cross-linked foam body 320 .
  • the inner cavity structure is not formed in the cross-linked foam body 320 unlike the previous embodiments. Though fore-mentioned descriptions pertaining to the inner cavity structure cannot be applied to this embodiment, the same idea and technique can be applied to this embodiment except those pertaining to the inner cavity structure.
  • Unexplained reference numbers 324 and 326 are protrusions over the surface of the cross-linked foam body 320 .
  • the cross-linked foam bodies 120 , 220 and 320 have a shape of an upper in the embodiments of the present invention, the cross-linked foam body may have a shape of a portion of the uppers such as fore-foot, middle-foot, rear-foot.
  • the cross-linked foam bodies 120 , 220 and 320 can be manufactured by foaming various foaming material known in the field by various foaming methods known in the field.
  • the foaming material for the cross-linked foam bodies 120 , 220 and 320 may be selected from a synthetic material having a possibility to become a foam using a various cross-linked foaming method, for example, synthetic resins such as an EVA based resin, a polyolefin based resin containing PEs of a variety of densities, a polyvinyl based resin, a polyurethane based resin, and LDPE(low density polyethylene)-added EVA, a copolymer thereof, a blend thereof, or a mixture thereof; a natural or synthetic rubber constituted by a mixture of a natural rubber, a styrene butadiene rubber (SBR) based, a poly-butadiene rubber(BR) based, an poly-isoprene rubber(IR) based, a chloropren
  • EVA ethylene-vinyl acetate
  • VA vinyl acetate
  • PE polyethylene

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
US11/813,086 2004-12-31 2005-04-21 Three-Dimensional Cross-Linked Foam for Uppers of Shoes Abandoned US20080028635A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2004-0117865 2004-12-31
KR1020040117865A KR100627143B1 (ko) 2004-12-31 2004-12-31 입체형 신발 갑피용 가교발포 성형체 및 그 제조방법
PCT/KR2005/001151 WO2006070976A1 (en) 2004-12-31 2005-04-21 Three dimensional cross-linked foam for uppers of shoes

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US20080028635A1 true US20080028635A1 (en) 2008-02-07

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US11/813,084 Abandoned US20080141469A1 (en) 2004-12-31 2005-04-21 Manufacturing Method of Three-Dimensional Cross-Linked Foam for Uppers of Shoes
US11/813,086 Abandoned US20080028635A1 (en) 2004-12-31 2005-04-21 Three-Dimensional Cross-Linked Foam for Uppers of Shoes
US11/813,087 Abandoned US20080028544A1 (en) 2004-12-31 2005-04-21 Manufacturing Method of Three-Dimensional Cross-Linked Foam for Uppers of Shoes

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EP (3) EP1830993A1 (ko)
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US20080028544A1 (en) 2008-02-07
KR20060078278A (ko) 2006-07-05
US20080141469A1 (en) 2008-06-19
KR100627143B1 (ko) 2006-09-25
WO2006070975A1 (en) 2006-07-06
EP1836036A1 (en) 2007-09-26
EP1836037A1 (en) 2007-09-26
EP1830993A1 (en) 2007-09-12

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