EP0812140B1 - Blast and fragment resistant polyurethane boot sole for safety footwear - Google Patents
Blast and fragment resistant polyurethane boot sole for safety footwear Download PDFInfo
- Publication number
- EP0812140B1 EP0812140B1 EP96907854A EP96907854A EP0812140B1 EP 0812140 B1 EP0812140 B1 EP 0812140B1 EP 96907854 A EP96907854 A EP 96907854A EP 96907854 A EP96907854 A EP 96907854A EP 0812140 B1 EP0812140 B1 EP 0812140B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polyaramid
- fibres
- sole
- layer
- kevlar
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/32—Footwear with health or hygienic arrangements with shock-absorbing means
-
- 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
- A43B13/42—Filling materials located between the insole and outer sole; Stiffening materials
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
Definitions
- the present invention relates to the construction of a boot sole, and more particularly pertains to a new and improved safety boot sole construction to prevent puncturing of the sole by high energy and high velocity projectiles thus affording greater protection to an individual's foot without over-restricting movement.
- U.S. Patent no. 5,285,583 to Aleven uses a protective layer composed of plastic and including a flexible forepart portion having an insole board bonded to its bottom surface and a fabric liner bonded to its top surface during the process of moulding the protective plastic layer.
- the plastic used by Aleven is molten plastic injected in the final bonding process.
- the base is a thermo-plastic moulding, or is made of metal, ceramic or graphite, in which multi-filament organic or inorganic reinforcing fibres are embedded in the form of a mat, or woven or knitted into the structure.
- the elastic profiled portions are formed on the underside of the base by injection moulding or pressing.
- the base can contain only a single layer of woven fibres, its total thickness being approximately 0.5 mm.
- US-A-4 858 338 describes a sole according to the preamble of claim 1.
- the boot soles described in the prior art are insufficient against blast and projectile protection when it is desired to conserve toe-to-heel flexion in order to enable running, jumping and to clear obstacles such as rope ladders, rope climbing, small steps, and with sufficient feel or sensitivity to detect edges, pits, and small stones. It is also an object of the present invention to provide a boot sole with good adhesion between the various polyaramid (Kevlar) layers and/or graphite fibre bundles in spite of the poor intrinsic adhesion between the polyaramid fibres, graphite fibres, and the polyurethane.
- the present invention provides a blast and fragment resistant polyester and/or polyether-based polyurethane boot sole comprising embedded protective material in which the material is embedded throughout the entire sole and is composed of at least one layer of woven polyaramid (Kevlar), the density of which is less than or equal to 0,51 kg/m 2 (15 oz per square yard), the polyaramid (Kevlar) and/or graphite fibres being coated thinly with polyester or polyether based polyurethane prior to weaving of the polyaramid layer. This improves adhesion between the polyaramid and polyurethane material. Increasing density and additional layers of woven polyaramid fibres increases the blast and fragment resistance.
- the polyurethane Due to the extremely thin coating of the various polyaramid (Kevlar) and/or graphite fibre bundles prior to weaving and/or due to the relatively loose or coarse weave of the polyaramid (Kevlar) fibres, the polyurethane is able to penetrate between the fibres, allowing the various layers to be well bonded together, thereby preventing the peeling apart of the sole in subsequent use.
- polyester fibres preferably poly(ethylene terephthalate) (PET) fibres
- PET poly(ethylene terephthalate)
- Kevlar poly(ethylene terephthalate)
- carbon graphite fibres can be interwoven with or between the polyaramid (Kevlar) layers to further strengthen and to stiffen the sole.
- a woven layer of mineral fibres notably ceramic fibres or S-glass fibres, can be included into the boot sole to act as a fire wall for protection against hot gasses with temperatures of between 815 and 1,650 degrees Celsius.
- a boot having a first embodiment of the sole construction according to the present invention is generally depicted as 10 in Figures 1 and 1-A.
- the boot 10 has a standard shaped upper portion 11 and a composite sole 13.
- the composite sole 13 comprises an outer polyurethane sole 14 having a tread 17, an intermediate sole 15 into which is embedded a layer of polyaramid fibres 18, and optionally, an upper sole 16.
- the composite safety boot sole is made in a traditional multi-stage mould which is commonly used in the polyurethane shoe soling industry.
- polyester and/or polyether-based polyurethane is first injected into a composite sole mould cavity to form the outer (lower) sole 14 such that its density is typically in the range of 500 to 2000 kg/m 3 .
- one thick layer of polyaramid (Kevlar) woven fibre material 18 is placed onto the outer (lower) sole 14 which remains in the mould cavity.
- the polyaramid (Kevlar) fibre material being precoated with polyester and/or polyether-based polyurethane prior to weaving.
- the coat of polyurethane serves to facilitate good adhesion with and penetration by polyurethane which is injected into the mould cavity.
- the density of the polyaramid layer 18 is at least 0,17 kg/m 2 (5 oz per square yard), preferably 0,51 kg/m 2 (15 oz per square yard), for each ply of woven polyaramid material.
- This thick polyaramid layer 18 preferably consists of bundles of polyaramid in crowfoot or leno weave with 70% to 90% in the X to Y direction (that is perpendicular to toe-to-heel), and 10 to 30% in the toe-to-heel direction.
- the thickness of the layer of the polyaramid layer 18 is at least 0,18 cm (0.07 inches), more typically 0,28 cm (0.11 inches), using Kevlar 49 in 7100 dernier bundles with tensile strength of 2,96 ⁇ 10 8 Pa (43,000 PSI) and modulus 1,31 ⁇ 10 11 Pa (19 million PSI) with a 0,18 cm (0.07 inch) diameter polyaramid fibres.
- polyester and/or polyether-based polyurethane is injected into the mould cavity containing the outer (lower) sole 14 at the base of the sole to form the intermediate sole 15.
- the polyurethane after injection into the mould has a typical density of ⁇ 1000 kg/m 3 .
- the upper portion 11 can be directly attached to the polyurethane composite sole 13 comprising of the outer (lower) and intermediate soles 14, 15 or a third upper sole 16 can be added on top of the intermediate sole for enhanced comfort.
- the outer (lower) and intermediate soles 14, 15 as described above are left in the mould cavity and polyester and/or polyether-based polyurethane is injected into the mould cavity, directly on top of the intermediate sole 15.
- a shoe sole 13 made according to the above method with the preferred 0,51 kg/m 2 (15 oz per square yard) polyaramid layer 18 is effective in providing blast and fragment resistance to 60 grain projectile with a velocity of 411 mps (1350 fps). It also conserves good toe-to-heel flexion in order to enable running, jumping and to clear obstacles such as rope ladders, rope climbing and small steps, while avoiding delamination of the sole in subsequent use.
- a boot having a second embodiment of the sole construction according to the present invention is depicted as 20 in Figures 2 and 2-A.
- the sole 13 has further layers 18 of polyaramid fibre material incorporated therein.
- the outer sole can have up to two layers of polyaramid fibre 18.
- the intermediate sole 15 would typically have between 2 and 6 layers of polyaramid fibre, with three layers being a typical number as is shown in Figure 2-A.
- the polyaramid layers 18 consist preferably of polyaramid fibres being of 0,25 mm (0.01 inch) diameter.
- the fibres are woven together to form a layer less than 0,15 cm (0.06 inches) thick and, more typically, about 0,10 cm (0.04 inches) thick.
- a polyester and/or polyether-based polyurethane is then injected into a composite shoe sole mould cavity to form the outer (lower) sole 14 such that its density is typically in the range of 500 to 2000 kg/m 3 .
- a polyester and/or polyether-based polyurethane is injected into the mould cavity to form the intermediate sole 15 such that the polyurethane has a typical density of ⁇ 1000 kg/m 3 .
- the upper portion 11 can be directly attached to the polyurethane composite sole 13 comprising of the outer (lower) and intermediate soles 14, 15 or a third, upper polyurethane sole 16 can be included for enhanced comfort.
- This is achieved by allowing the outer and intermediate soles (made by the process above) to remain in the mould cavity and by injecting polyester and/or polyether-based polyurethane onto the intermediate sole 15.
- a shoe sole made according to the above method is even more effective in providing blast and fragment resistance than the first embodiment due to the multiple polyaramid layers.
- polyaramid layers 18 as described in relation to soles depicted in Figures 1 and 2 are interwoven with polyester (PET) fibres and the boot sole is made in the same manner as described above.
- interwoven polyaramid and polyester (PET) fibres has the advantage of further increasing the adhesion of the polyurethane material to the embedded layer(s) 18. This being due to the intrinsically superior adhesion between polyurethane and polyester.
- the polyaramid layers 18 as described in the embodiments above are further interwoven with carbon graphite fibres having 12K TOW and a tensile strength of 3,24 ⁇ 10 9 Pa (470,000 PSI) and modulus of 2,41 ⁇ 10 11 Pa (35 million PSI) with the boot sole 13 being made in the same manner as described above.
- interwoven carbon graphite fibres has the advantage of further increasing strength and stiffness and of improving wear resistance.
- boot sole 13 is made as described above except that, in addition, a layer of woven ceramic fibres of composite ceramic/polyaramid fibres 31 are included into the intermediate sole 15.
- the woven ceramic fibre layer is preferably comprised of 0,13 cm diameter ceramic fibres with 70% to 90% of the ceramic fibres being woven into a crowfoot or leno weave in the X-Y direction (perpendicular to the toe-to-heel direction) and with 10% to 30% of ceramic fibres in the toe-to-heel direction.
- This layer is embedded in the intermediate sole above the polyaramid (Kevlar) layer(s) 18 (see Figure 3-A).
- a thin 0,64 mm, composite layer 32 of ceramic/polyaramid fibres preferably consisting of standard bidirectional weave can be embedded in the upper sole 16.
- the boot sole incorporating this composite layer of ceramic/polyaramid fibres 32 allows for protection against hot gasses, with a temperature resistance of 1,650 degrees Celsius during the very brief duration of the blast.
- a layer of composite S-Glass fibres can be added into the middle or upper sole 14, 15 (see Figures 4, 4-A and 4-B).
- a thinner 0,64 mm layer 42 of S-Glass fibres preferably having a standard bi-directional satin weave can be embedded in the upper sole 16 ( Figure 4-B).
- the boot sole 13 incorporating the layer of S-Glass fibres 41, 42 allows for protection against hot gasses with a temperature resistance of 815 degrees Celsius for the very brief duration of the blast.
Abstract
Description
Claims (10)
- A blast and fragment resistant polyester or polyether-based polyurethane boot sole comprising embedded protective material characterised in that the material is embedded through the entire sole and is composed of at least one layer of woven polyaramid (Kevlar) fibres, the density of which is less than or equal to 0,51 kg/m2 (15 oz per square yard), the polyaramid fibres being thinly coated with polyester and/or polyether-based polyurethane prior to weaving of the polyaramid layer.
- The sole according to claim 1, characterised in that the embedded material consists of one thick polyaramid (Kevlar) woven layer, the thickness of which is at least 0,18 cm (0.07 inches).
- The sole of claim 2 wherein the thick polyaramid layer consists of bundles of polyaramid in crowfoot or leno weave with 70% to 90% in the X-to-Y direction and 10% to 30% in the toe-to-heel direction.
- The sole according to claim 1 characterised in that the embedded material includes at least 3 polyaramid (Kevlar) woven layers, the thickness of each layer being less than 0,15 cm (0.06 inches), bonded together by the polyurethane material.
- The sole according to one of the above claims characterised in that the polyaramid fibres comprising the polyaramid (Kevlar) layers are interwoven with polyester (PET) fibres.
- The sole according to any one of the above claims characterised in that the polyaramid fibres comprising the polyaramid (Kevlar) layers are interwoven with carbon graphite fibres.
- The sole according to any one of the claims 1 to 5 characterised in that the embedded material includes at least one layer of carbon graphite fibres.
- The sole according to any one of the above claims characterised in that the embedded materials include at least one layer of mineral fibres.
- The sole according to claim 8 characterised in that the mineral fibres consist of ceramic fibres.
- The sole according to claim 9 characterised in that the mineral fibres consist of S-Glass fibres.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SG9500037 | 1995-03-01 | ||
SG1995000037A SG34208A1 (en) | 1995-03-01 | 1995-03-01 | Blast and fragment resistant polyurethane boot sole for safety footwear |
PCT/SG1996/000001 WO1996026655A1 (en) | 1995-03-01 | 1996-02-28 | Blast and fragment resistant polyurethane boot sole for safety footwear |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0812140A1 EP0812140A1 (en) | 1997-12-17 |
EP0812140B1 true EP0812140B1 (en) | 2000-05-10 |
Family
ID=20429030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96907854A Expired - Lifetime EP0812140B1 (en) | 1995-03-01 | 1996-02-28 | Blast and fragment resistant polyurethane boot sole for safety footwear |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0812140B1 (en) |
KR (1) | KR100229887B1 (en) |
CN (1) | CN1121830C (en) |
AT (1) | ATE192631T1 (en) |
AU (1) | AU694636B2 (en) |
CA (1) | CA2213988C (en) |
DE (1) | DE69608258T2 (en) |
NO (1) | NO310541B1 (en) |
NZ (1) | NZ304186A (en) |
SG (1) | SG34208A1 (en) |
TR (1) | TR199700745T1 (en) |
WO (1) | WO1996026655A1 (en) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69710340T2 (en) * | 1996-05-21 | 2002-10-17 | Bfr Holdings Ltd | EXPLOSION-PROOF FOOTWEAR |
GB2315663A (en) * | 1996-07-30 | 1998-02-11 | Fii Footwear Management Ltd | Footwear item |
FR2770098B1 (en) | 1997-10-23 | 1999-12-03 | Etex De Rech Tech Soc | ANTI-PERFORATION DEVICE FOR FOOTWEAR AND FOOTWEAR USING SUCH A DEVICE |
SG126668A1 (en) * | 1998-12-29 | 2006-11-29 | Bfr Holding Ltd | Protective boot and sole structure |
US6368989B1 (en) | 1999-01-12 | 2002-04-09 | E. I. Du Pont De Nemours And Company | Puncture resistant composite |
FR2815289B1 (en) * | 2000-10-17 | 2003-07-04 | Salomon Sa | LOW THICKNESS COMPOSITE LAMINATE AND ITS USE IN THE MANUFACTURE OF SPORTS ITEMS, ESPECIALLY SHOES |
KR100484227B1 (en) * | 2001-05-22 | 2005-05-23 | 이균희 | safety combat shoes |
GB0329813D0 (en) | 2003-12-23 | 2004-01-28 | Terra Plana Internat Ltd | Footwear |
KR101291847B1 (en) | 2011-08-23 | 2013-07-31 | 한스산업 주식회사 | Safety boot's Midsole as inserted a Penetration-Resistant and its Mamufacturing Process |
CA2806073C (en) | 2012-02-09 | 2014-07-08 | Simon La Rochelle | Footwear with sole protection |
CN103704934A (en) * | 2013-05-14 | 2014-04-09 | 吴江市董鑫塑料包装厂 | High-comfort antistatic puncture-resistant labor protection boot |
CN103704926A (en) * | 2013-05-14 | 2014-04-09 | 吴江市董鑫塑料包装厂 | Heat-insulating and puncture-preventing working boot |
CN103284396A (en) * | 2013-05-14 | 2013-09-11 | 吴江市董鑫塑料包装厂 | Light-reflecting puncture-resistant labor-protecting boot |
CN103251168B (en) * | 2013-05-14 | 2016-03-16 | 吴江市风尚鞋厂 | A kind of massage is anti-pierces through working boot |
CN103251167A (en) * | 2013-05-14 | 2013-08-21 | 吴江市董鑫塑料包装厂 | Storing and anti-piercing labor protection boot |
CN103251169B (en) * | 2013-05-14 | 2016-03-16 | 吴江市风尚鞋厂 | A kind of elastic bag ventilation is anti-pierces through working boot |
CN103300534A (en) * | 2013-05-14 | 2013-09-18 | 吴江市董鑫塑料包装厂 | Automatic massage anti-puncturing working boots |
CN103230121A (en) * | 2013-05-14 | 2013-08-07 | 吴江市董鑫塑料包装厂 | Heating warm-keeping anti-piercing working boots |
CN103404997A (en) * | 2013-05-14 | 2013-11-27 | 吴江市董鑫塑料包装厂 | Anti-piercing light-emitting working boots |
CN103393251A (en) * | 2013-05-14 | 2013-11-20 | 吴江市董鑫塑料包装厂 | Thermal insulation puncturing-resistant working boots |
CN103230122A (en) * | 2013-05-14 | 2013-08-07 | 吴江市董鑫塑料包装厂 | Luminous anti-puncture labor insurance boot with self-generated power source |
CN103238977A (en) * | 2013-05-14 | 2013-08-14 | 吴江市董鑫塑料包装厂 | Ventilation anti-puncture working boot |
CN103251165A (en) * | 2013-05-14 | 2013-08-21 | 吴江市董鑫塑料包装厂 | Anti-static puncture-proof working boot |
CN103315442B (en) * | 2013-07-22 | 2015-08-05 | 青岛亨达股份有限公司 | A kind of special policeman fights instruction boots |
KR102325655B1 (en) | 2014-08-06 | 2021-11-15 | 에자이 알앤드디 매니지먼트 가부시키가이샤 | Method for producing pyrimidin-1-ol compound, and intermediate thereof |
CN106117504B (en) * | 2016-07-05 | 2018-07-06 | 晋江市池店镇娇鹏贸易有限公司 | A kind of polyurethane elastomer material for sole of shoe |
MX2022002038A (en) | 2019-09-13 | 2022-03-11 | Eisai R&D Man Co Ltd | Pharmaceutical composition for treating insomnia. |
IL299125A (en) | 2020-07-17 | 2023-02-01 | Eisai R&D Man Co Ltd | Substituted piperidine compound and application thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2216439C3 (en) * | 1972-04-05 | 1976-01-08 | Dr.-Ing. Funck Kg, 8000 Muenchen | Shoe, in particular work or sports shoe |
DE3027601C2 (en) * | 1980-07-21 | 1982-06-24 | Herbert Dr.-Ing. 8032 Lochham Funck | Molded sole with puncture-proof insert |
CA1180891A (en) * | 1982-06-16 | 1985-01-15 | Henry D. Sweeny | Insulative mid-sole assembly |
US4858338A (en) * | 1988-05-18 | 1989-08-22 | Orthopedic Design | Kinetic energy returning shoe |
-
1995
- 1995-03-01 SG SG1995000037A patent/SG34208A1/en unknown
-
1996
- 1996-02-28 CN CN96192057A patent/CN1121830C/en not_active Expired - Fee Related
- 1996-02-28 KR KR1019970705448A patent/KR100229887B1/en not_active IP Right Cessation
- 1996-02-28 NZ NZ304186A patent/NZ304186A/en unknown
- 1996-02-28 CA CA002213988A patent/CA2213988C/en not_active Expired - Fee Related
- 1996-02-28 AT AT96907854T patent/ATE192631T1/en not_active IP Right Cessation
- 1996-02-28 WO PCT/SG1996/000001 patent/WO1996026655A1/en active IP Right Grant
- 1996-02-28 EP EP96907854A patent/EP0812140B1/en not_active Expired - Lifetime
- 1996-02-28 DE DE69608258T patent/DE69608258T2/en not_active Expired - Fee Related
- 1996-02-28 TR TR97/00745T patent/TR199700745T1/en unknown
- 1996-02-28 AU AU51313/96A patent/AU694636B2/en not_active Ceased
-
1997
- 1997-08-26 NO NO19973905A patent/NO310541B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
NO973905D0 (en) | 1997-08-26 |
WO1996026655A1 (en) | 1996-09-06 |
DE69608258D1 (en) | 2000-06-15 |
ATE192631T1 (en) | 2000-05-15 |
DE69608258T2 (en) | 2000-12-21 |
KR100229887B1 (en) | 1999-11-15 |
AU5131396A (en) | 1996-09-18 |
CN1175888A (en) | 1998-03-11 |
SG34208A1 (en) | 1996-12-06 |
NZ304186A (en) | 1999-04-29 |
CA2213988A1 (en) | 1996-09-06 |
TR199700745T1 (en) | 1998-03-21 |
NO973905L (en) | 1997-09-01 |
KR19980702053A (en) | 1998-07-15 |
AU694636B2 (en) | 1998-07-23 |
EP0812140A1 (en) | 1997-12-17 |
CN1121830C (en) | 2003-09-24 |
NO310541B1 (en) | 2001-07-23 |
CA2213988C (en) | 2000-04-25 |
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