EP0614623A1 - Bouts durs pour chaussures de sécurité - Google Patents

Bouts durs pour chaussures de sécurité Download PDF

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Publication number
EP0614623A1
EP0614623A1 EP94102424A EP94102424A EP0614623A1 EP 0614623 A1 EP0614623 A1 EP 0614623A1 EP 94102424 A EP94102424 A EP 94102424A EP 94102424 A EP94102424 A EP 94102424A EP 0614623 A1 EP0614623 A1 EP 0614623A1
Authority
EP
European Patent Office
Prior art keywords
reinforced thermoplastic
toe
fiber
short
cap
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.)
Granted
Application number
EP94102424A
Other languages
German (de)
English (en)
Other versions
EP0614623B1 (fr
Inventor
Seijiro Nishizaki
Kiyoshi Takeshima
Yoshiharu Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YKK Corp
Original Assignee
YKK Corp
Yoshida Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by YKK Corp, Yoshida Kogyo KK filed Critical YKK Corp
Publication of EP0614623A1 publication Critical patent/EP0614623A1/fr
Application granted granted Critical
Publication of EP0614623B1 publication Critical patent/EP0614623B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/08—Heel stiffeners; Toe stiffeners
    • A43B23/081—Toe stiffeners
    • A43B23/086—Toe stiffeners made of impregnated fabrics, plastics or the like

Definitions

  • This invention relates to a toe-cap or boxtoe for use in safety foot wear such as shoes and boots (hereinafter referred to collectively as "shoe”) to reinforce structurally the toe of a shoe and enhance the safety of the shoe.
  • the toe-caps having plastic layers superposed on a steel core member thereof possibly fail to accomplish their object as a manufactured article because they are liable to entail interfacial separation between the steel core member and the plastic layers. Further, since these toe-caps are made of steel, their manufacture turns out to be a troublesome work. Moreover, the toe-caps have a large weight because their core members are made of steel.
  • the present invention aims to provide a toe-cap for a safety shoe which is light and so strong as to resist compression. More specifically, the present invention aims to provide a novel light toe-cap for a safety shoe which passes the standard for toe-caps for safety shoes [Japanese Industrial Standard (JIS) T 8101 "Safety leather Shoes, Type S"].
  • JIS Japanese Industrial Standard
  • the toe-cap is formed of a composite material comprising a fiber-reinforced thermoplastic resin and at least one wire mesh or woven metallic wire having a size of 7 to 200 meshes and embedded in the fiber-reinforced thermoplastic resin.
  • the wire mesh is embedded in the central part of the fiber-reinforced thermoplastic resin in substantially parallel with the surfaces thereof.
  • the wire meshes are embedded one each in opposite surface layers of the fiber-reinforced thermoplastic resin in substantially parallel with the surfaces thereof.
  • the fiber-reinforced thermoplastic resin comprises a long-fiber reinforced thermoplastic layer having reinforcing long fibers incorporated therein and a short-fiber reinforced thermoplastic layer having reinforcing short fibers incorporated therein, and the wire mesh is embedded in the short-fiber reinforced thermoplastic layer.
  • the toe-cap is formed of a composite material comprising (A) a short-fiber reinforced thermoplastic layer having reinforcing short fibers incorporated therein, (B) long-fiber reinforced thermoplastic layers lying one each in the opposite surface parts of the short-fiber reinforced thermoplastic layer and having reinforcing long fibers incorporated therein, and (C) a wire mesh having a size of 7 to 200 meshes and embedded in the aforementioned short-fiber reinforced thermoplastic layer.
  • the toe-cap is formed of a composite material comprising (A) a long-fiber reinforced thermoplastic layer having reinforcing long fibers incorporated therein, (B) short-fiber reinforced thermoplastic layers lying one each in the opposite surface parts of the long-fiber reinforced thermoplastic layer and having reinforcing short fibers incorporated therein, and (C) wire meshes having a size of 7 to 200 meshes and embedded one each in the aforementioned short-fiber reinforced thermoplastic layers.
  • the composite material further comprises skin layers made of a thermoplastic resin and lying one each in the outside surface parts of the aforementioned short-fiber reinforced thermoplastic layers.
  • the toe-cap according to the present invention is formed of a composite material comprising a fiber-reinforced thermoplastic resin and at least one wire mesh having a size of 7 to 200 meshes and embedded in the fiber-reinforced thermoplastic resin, it is light and so strong as to resist such high compression as more than 1,100 kg. Use of this toe-cap allows production of a safety shoe which gives the wearer comfortable mobility and highly reliable safe use.
  • thermoplastic resin which is advantageously used as a matrix resin
  • examples of the thermoplastic resin which is advantageously used as a matrix resin include, but are not limited to: nylon 6, polycarbonate (PC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), and PBT/PC alloy.
  • the reinforcing fibers are glass fibers.
  • the glass fibers fall under two types, short fibers and long fibers.
  • the long fibers include random mat type fibers, woven fabric type fibers, and unidirectional mat type fibers.
  • the short fibers have weak strength. While the long fibers generally have sufficient strength, those of the woven fabric type and the unidirectional mat type have poor flowability and entail a problem of moldability and are at a disadvantage in necessitating a fabrication to be completed as a manufactured article aimed at.
  • the present invention contemplates constituting a composite material comprising a glass-fiber reinforced thermoplastic resin and a wire mesh embedded therein in such a manner that short glass fibers are arranged near the wire mesh and long glass fibers are arranged in the other parts of the composite material. Owing to this arrangement, the glass fibers are allowed infallibly to enter the meshes of the wire mesh and consequently exalt the interlaminar strength.
  • the content of the glass fibers in the fiber-reinforced thermoplastic resin is desired to be in the range of 30 to 65% and the diameter of the individual glass fibers in the range of 9 to 13 ⁇ m. If the content of the glass fibers falls short of 30%, the insufficient supply of glass fibers will naturally prevent the fiber-reinforced thermoplastic resin and the toe-cap made predominantly thereof from acquiring sufficient strength. If the content of glass fibers exceeds 65%, the fiber-reinforced thermoplastic resin will be brittle. The excess supply of glass fibers, therefore, will put the composite material at a disadvantage in entailing degradation of elasticity and restoring force in spite of an increase in hardness and tending to break owing to concentration of compressive force.
  • the fiber-reinforced thermoplastic resin manifests the strength thereof more conspicuously when the diameter of the individual glass fibers is in the range of 9 to 13 ⁇ m. If the diameter of the individual glass fibers is smaller than 9 ⁇ m, since the glass fibers have a larger surface area for a fixed amount of glass fibers, the glass fibers will not be sufficiently wetted with the thermoplastic resin and the fiber-reinforced thermoplastic resin will fail to acquire high strength. Conversely, if the diameter of the individual glass fibers exceeds 13 ⁇ m, the fiber-reinforced thermoplastic resin will suffer from insufficient strength and brittleness.
  • the metallic materials which are effectively usable for the wire mesh include steel, stainless steel, and nickel, for example.
  • the wire mesh a physical or chemical surface treatment.
  • the physical treatment include shot blasting and liquid honing which are intended to coarsen a given surface.
  • the chemical treatment include bonderizing treatment, chromic acid treatment, silane treatment, and zinc plating which are effective for a wire mesh made of steel.
  • the chromic acid treatment, oxide film-forming treatment, etc. are available for a wire mesh made of stainless steel.
  • Fig. 1 illustrates one example of the composite material to be used for the toe-cap of the present invention.
  • This composite material comprises a short-fiber reinforced thermoplastic layer 2 having reinforcing short fibers 6 incorporated in a thermoplastic resin 7, long-fiber reinforced thermoplastic layers 1 lying one each in the opposite surface parts of the short-fiber reinforced thermoplastic layer 2 and having reinforcing long fibers 5 incorporated in the thermoplastic resin 7, and a wire mesh 4 embedded in the short-fiber reinforced thermoplastic layer 2 disposed in the central part of the composite material.
  • Fig. 2 illustrates another example of the composite material.
  • the composite material shown in Fig. 2 comprises a long-fiber reinforced thermoplastic layer 1 disposed in the central part thereof, short-fiber reinforced thermoplastic layers 2 lying one each in the opposite surface parts of the long-fiber reinforced thermoplastic layer 1, skin layers 3 made of the thermoplastic resin 7 and lying one each in the outside surface parts of the short-fiber reinforced thermoplastic layers 2, and wire meshes 4 embedded one each in the short-fiber reinforced thermoplastic layers 2.
  • short-fiber reinforced thermoplastic layers 2 are formed around each wire mesh.
  • Fig. 3 illustrates a process for manufacture of the composite material shown in Fig. 1.
  • Platelike fiber-reinforced thermoplastic materials 8 each having a short-fiber reinforced thermoplastic layer 2 formed on the side confronting the wire mesh 4 and a long-fiber reinforced thermoplastic layer 1 formed on the other side thereof are opposed to each other across the wire mesh 4.
  • the short-fiber reinforced thermoplastic layers 2 are wrapped around the wires of the wire mesh 4 to give rise to a composite material having the wire mesh 4 embedded in the short-fiber reinforced thermoplastic layers 2 as illustrated in Fig. 1.
  • Production of a toe-cap for a safety shoe with the platelike composite material 9 is accomplished by cutting the platelike composite material 9 in the shape of a toe-cap for a safety shoe, setting the toe-cap workpiece in place in a female mould 10, lowering a male mould 11 to depress the workpiece against the female mould 10, and applying heat and pressure to the workpiece interposed therebetween, as illustrated in Fig. 4. Consequently, the toe-cap 20 for a safety shoe illustrated in Fig. 5 is obtained.
  • the toe-cap 20 has a domed shape conforming to the toe part of a safety shoe or boot so that, in use, it will cover the toes.
  • the lower edge of the domed part 20a of the toe-cap 20 is provided with an inwardly directed integrally moulded skirt part 20b.
  • the strength of the toe-cap for a safety shoe is affected to a great extent by the properties of the wire mesh. If the wire mesh has a size of less than 7 meshes, for example, the total surface area of the wire mesh is unduly small without reference to the diameter of the individual wires of the wire mesh and the produced toe-cap fails to acquire prescribed strength. If the diameter of the wires of the wire mesh exceeds 620 ⁇ m, the adhesiveness of the wire mesh to the thermoplastic resin is insufficient and the produced toe-cap tends to sustain cohesive failure even when the wire mesh has a size of not less than 7 meshes. Conversely, if the wire mesh has a size of 200 meshes, the produced toe-cap fails to acquire the strength aimed at when the diameter of wires of the wire mesh is less than 40 ⁇ m.
  • Fig. 6 graphically illustrates a hatched area representing the relation between the mesh size of a wire mesh and the diameter of the individual wires of the wire mesh which was found to pass the standard strength 1,100 kg of compressive resistance (JIS T 8101, "Leather Safety Shoe, Type S”) in an experiment performed on products using wire meshes of varying mesh sizes and varying wire diameters.
  • the fiber-reinforced thermoplastic resin was nylon 6 resin containing 45% of glass fibers.
  • steel wires which had undergone a liquid honing treatment and then a chromic acid treatment were used.
  • Fig. 7 is a graph showing the relation between the compressive strength and the mesh size of the wire mesh actually observed in products using wire mesh whose relevant data fall within the hatched area of Fig. 6.

Landscapes

  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP19940102424 1993-02-26 1994-02-17 Bouts durs pour chaussures de sécurité Expired - Lifetime EP0614623B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP38237/93 1993-02-26
JP3823793A JPH06245804A (ja) 1993-02-26 1993-02-26 安全靴先芯

Publications (2)

Publication Number Publication Date
EP0614623A1 true EP0614623A1 (fr) 1994-09-14
EP0614623B1 EP0614623B1 (fr) 1997-07-30

Family

ID=12519698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940102424 Expired - Lifetime EP0614623B1 (fr) 1993-02-26 1994-02-17 Bouts durs pour chaussures de sécurité

Country Status (4)

Country Link
EP (1) EP0614623B1 (fr)
JP (1) JPH06245804A (fr)
DE (1) DE69404507T2 (fr)
ES (1) ES2105370T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10114560A1 (de) * 2001-03-24 2002-09-26 Uvex Arbeitsschutz Gmbh Schutzschuh, Sicherheitsschuh bzw. -stiefel
US7178267B2 (en) 2003-12-12 2007-02-20 Polyworks, Inc. Method for forming footwear structures using thermoforming
CN1309326C (zh) * 2001-08-10 2007-04-11 Ykk株式会社 由长纤维加强型热塑树脂制成的防护鞋鞋头及其制造方法
WO2022179693A1 (fr) * 2021-02-26 2022-09-01 GÖSSEL, Thorsten Capuchon de protection pour chaussure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2007015351A (es) 2007-12-05 2008-09-18 Internac De Calzado Ten Pac S Casco de proteccion para calzado industrial.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050144A (en) * 1979-06-09 1981-01-07 Lsb Orthopaedics Ltd Reinforced toe caps
EP0100181A1 (fr) * 1982-07-28 1984-02-08 Imperial Chemical Industries Plc Coquille protège-orteils
EP0102414A1 (fr) * 1982-07-30 1984-03-14 Foss Manufacturing Company, Inc. Laminé de renforcement
FR2572259A1 (fr) * 1984-10-25 1986-05-02 Sofrex Chaussure de securite a bout dur de faible poids
EP0507322A2 (fr) * 1991-04-03 1992-10-07 Ykk Corporation Matériau de montage en feuille et bout pour chaussures de sécurité

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050144A (en) * 1979-06-09 1981-01-07 Lsb Orthopaedics Ltd Reinforced toe caps
EP0100181A1 (fr) * 1982-07-28 1984-02-08 Imperial Chemical Industries Plc Coquille protège-orteils
EP0102414A1 (fr) * 1982-07-30 1984-03-14 Foss Manufacturing Company, Inc. Laminé de renforcement
FR2572259A1 (fr) * 1984-10-25 1986-05-02 Sofrex Chaussure de securite a bout dur de faible poids
EP0507322A2 (fr) * 1991-04-03 1992-10-07 Ykk Corporation Matériau de montage en feuille et bout pour chaussures de sécurité

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10114560A1 (de) * 2001-03-24 2002-09-26 Uvex Arbeitsschutz Gmbh Schutzschuh, Sicherheitsschuh bzw. -stiefel
CN1309326C (zh) * 2001-08-10 2007-04-11 Ykk株式会社 由长纤维加强型热塑树脂制成的防护鞋鞋头及其制造方法
US7178267B2 (en) 2003-12-12 2007-02-20 Polyworks, Inc. Method for forming footwear structures using thermoforming
WO2022179693A1 (fr) * 2021-02-26 2022-09-01 GÖSSEL, Thorsten Capuchon de protection pour chaussure

Also Published As

Publication number Publication date
DE69404507T2 (de) 1998-02-19
ES2105370T3 (es) 1997-10-16
DE69404507D1 (de) 1997-09-04
EP0614623B1 (fr) 1997-07-30
JPH06245804A (ja) 1994-09-06

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