WO2010131216A1 - Reinforced flexible hose with high pressure strenght and method for its manufacturing - Google Patents
Reinforced flexible hose with high pressure strenght and method for its manufacturing Download PDFInfo
- Publication number
- WO2010131216A1 WO2010131216A1 PCT/IB2010/052119 IB2010052119W WO2010131216A1 WO 2010131216 A1 WO2010131216 A1 WO 2010131216A1 IB 2010052119 W IB2010052119 W IB 2010052119W WO 2010131216 A1 WO2010131216 A1 WO 2010131216A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- yarns
- layer
- yarn
- hose
- tenacity
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 9
- 239000000835 fiber Substances 0.000 claims abstract description 95
- 230000002787 reinforcement Effects 0.000 claims abstract description 73
- 229920000728 polyester Polymers 0.000 claims abstract description 36
- 239000002861 polymer material Substances 0.000 claims abstract description 19
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 11
- 238000009940 knitting Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 19
- 229920000271 Kevlar® Polymers 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000002262 irrigation Effects 0.000 claims description 6
- 238000003973 irrigation Methods 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004760 aramid Substances 0.000 claims description 5
- 229920006231 aramid fiber Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
- 229920002748 Basalt fiber Polymers 0.000 claims description 2
- 229920000784 Nomex Polymers 0.000 claims description 2
- 229920000561 Twaron Polymers 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000004763 nomex Substances 0.000 claims description 2
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 7
- 239000004753 textile Substances 0.000 description 4
- 229920012485 Plasticized Polyvinyl chloride Polymers 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/22—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration
- D04B1/225—Elongated tubular articles of small diameter, e.g. coverings or reinforcements for cables or hoses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/026—Knitted fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
- F16L11/085—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more braided layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0253—Polyolefin fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
- B32B2262/0269—Aromatic polyamide fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/103—Metal fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/14—Mixture of at least two fibres made of different materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/546—Flexural strength; Flexion stiffness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/712—Weather resistant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2597/00—Tubular articles, e.g. hoses, pipes
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
- D10B2505/02—Reinforcing materials; Prepregs
Definitions
- the present invention generally finds application in the field of flexible hoses, and particularly relates to an high pressure reinforced flexible hose, particularly for irrigation.
- the invention further relates to a method of making such hose.
- Flexible hoses generally have an inner layer or substrate, an outer layer or cover or skin, and at least one reinforcement layer, composed of a plurality of yarns.
- the reinforcement layer may be of meshed type, in which the yarns are in overlapped relation to form a mesh, or of knitted type, in which the yarns are knitted together to form chain stitches, also known as tricot stitches.
- Such prior art reinforcements are generally made of polyester, polyethylene, polyurethane or the like fiber yarns.
- Knitted reinforcements are known to have greater malleability and kink- resistance than meshed reinforcements.
- a meshed reinforcement involves lower manufacturing costs and has a higher pressure resistance than a knitted reinforcement.
- Hoses are further known which have a single or double reinforcement layer, at least one of them being knitted, which are aimed at combining malleability with high pressure and kink resistance, using high tenacity materials, such as aramid fibers.
- US 2001/39972 discloses an irrigation hose comprising a first spiral reinforcement layer and a second knitted layer overlying the former.
- one of the layers is wholly made of materials having a higher tenacity than the materials that are commonly used for this purpose, e.g. polyester.
- materials that are commonly used for this purpose e.g. polyester.
- Kevlar® one of the possible suitable high- tenacity materials.
- the provision of a reinforcement layer wholly made of Kevlar® is not only poorly cost effective, but also has further technical drawbacks.
- a reinforcement layer wholly made of a high tenacity fiber, such as aramid fibers, e.g. Kevlar® will not perfectly adhere to such substrate.
- the covering layer shall have a greater thickness than in the solutions with common fibers, such as of polyester type. Furthermore, there will never be an optimal adhesion between the substrate and the overlying layer, which will result in a poor quality hose.
- the object of the present invention is to at least partially overcome the above drawbacks, by providing a flexible hose that is highly efficient and relatively cost effective.
- Another object of the invention is to provide a flexible hose that is relatively cost effective, ensures considerable high pressure resistance, relative malleability and minimizes kinking.
- Another object of the invention is to provide a flexible hose that ensures considerable high pressure resistance and relative malleability, minimizes kinking and can be manufactured in a simple and quick manner.
- Yet another object is to provide a high pressure flexible hose that also ensures a highly stable coupling of the tubular layers and can have a thin covering layer, thereby affording materials savings.
- the flexible hose of the invention may comprise at least one first inner layer or substrate, made of a first thermoplastic polymer material, at least one reinforcement layer and at least one second outer or covering layer, or skin, made of a second thermoplastic polymer material.
- first and second thermoplastic polymer materials of the first and second layers respectively may be compatible.
- compatible materials or derivatives thereof shall be intended to indicate materials having a chemical and/or physical compatibility with each other, i.e. materials that, while in joined relationship, provide a junction adapted to support the transfer of tensile or shear stresses through the contact surface. The highest compatibility is thus achieved between identical materials or having the same matrix base.
- the first and/or second polymer materials may all have a plasticized PVC (polyvinyl chloride) based matrix.
- both materials may include a plasticized polyvinyl chloride based matrix.
- matrix of a polymer or derivatives thereof, shall be intended to indicate a polymer material that can provide the molecular structure of the final product.
- the term "-based matrix" or derivatives thereof, preceded by the name of a polymer material shall be intended to indicate a polymer material capable of providing the molecular structure of the polymer material whose name precedes the term "-based matrix) to the final product.
- the reinforcement layer may be composed of a plurality of yarns knitted together to form a plurality of chain stitches of the tricot type.
- One or more of the yarns that form the reinforcement layer may be a high tenacity fiber, advantageously having a higher tenacity than the polyester fiber.
- the polyester fiber has a tenacity of about 700 - 800 mN/tex.
- the high tenacity fiber may have a tenacity of at least 1500 mN/tex. It was surprisingly found that, from this tenacity value on, the knitted reinforcement layer with tricot stitches imparts high internal pressure resistance to the hose.
- this high tenacity fiber may have a tenacity of at least 1800 mN/tex, preferably at least 2000 mN/tex and more preferably at least 2150 mN/tex.
- This configuration will provide the high malleability and kink resistance of the tricot reinforcement layer, as well as a high internal pressure resistance, with relatively low process costs.
- the Applicant has conceived a highly malleable hose, that minimizes kinking, ensures high internal pressure resistance, and also allows less expensive and quicker manufacture as compared with the prior art.
- the flexible hose of the invention will provide a considerable high pressure resistance, by using high tenacity fibers having a selected tenacity to impart high internal pressure resistance.
- the hose of the invention will provide high malleability and minimized kinking, due to the at least one knitted reinforcement with tricot stitches.
- the hose of the invention will be manufactured in a cost-effective and quick manner because, under the same internal pressure resistance and malleability conditions, the manufacturing process involves the formation of one knitted reinforcement with tricot stitches instead of two reinforcements, unlike the above prior art hoses.
- this at least one high-tenacity fiber may have physical and/or chemical properties allowing it to be knitted with the polyester fiber.
- fiber or derivatives, possibly preceded by the name of a material that constitutes it, is intended as the assembly of one or more fibrous products that are joined together by spinning or similar processes to form a yarn.
- tenacity or derivatives shall be intended as the tenacity of a fiber according to the known EN ISO 2062 standard. Measurements may be preferably made at ambient temperature.
- such at least one high tenacity fiber may be selected from the group comprising aramid fibers, such as Kevlar®, Nomex® or Twaron®, high modulus polyethylene fibers, polyether ether ketone fibers (PEEK), carbon fiber, metal fibers, basalt fibers or hybrid fibers obtained by joining together two or more of them.
- aramid fibers such as Kevlar®, Nomex® or Twaron®
- PEEK polyether ether ketone fibers
- carbon fiber metal fibers
- basalt fibers basalt fibers or hybrid fibers obtained by joining together two or more of them.
- These materials differ in their elastic and/or tenacity properties and/or in their environmental and/or plastic collapse resistance properties.
- At least one second yarn of the reinforcement layer is formed of a polyester fiber or a fiber of substantially equal tenacity.
- the textile reinforcement layer may be formed of one or more high tenacity fibers, e.g. Kevlar® and/or carbon fibers, and one or more polyester fibers or fibers of equal tenacity, in any amount.
- the second yarn made of a polyester fiber or a fiber of equal tenacity will be joined to at least one high tenacity yarn.
- the polyester yarn will overlap the high tenacity yarn at multiple locations, to form a single reinforcement layer in which the polyester or similar yarns will not be separable from high tenacity yarns, unlike prior art hoses, in which the Kevlar or the like layers are substantially independent of polyester layers.
- the second yarn made of a polyester fiber or a fiber of equal tenacity will be knitted with the first high tenacity yarn.
- the second yarn made of a heat shrink material, will be adapted to put the first wire under tension to adhere the reinforcement layer to the underlying layer.
- Polyester fibers, or fibers of equal tenacity have higher heat shrink properties, whereby if a heat shrinking step is provided during manufacture, the polyester or similar fiber will tend to shrink and wrap the substrate, thereby putting the high tenacity fibers coupled thereto under tension.
- heat shrink properties will designate the ability of a material to shrink in response to heating by a heat source, to adhere to the underlying material.
- all the yarns of the first plurality may have the same tenacity as the first yarn and be high tenacity fibers having a tenacity of at least 1500 mN/tex.
- the textile reinforcement layer may include a first knitted portion that is wholly formed of high tenacity fibers, having a tenacity of at least 1500 mN/tex.
- one or more of these may have a tenacity of at least 1800 mN/tex, more preferably at least 2000 mN/tex and most preferably at least 2150 mN/tex.
- the yarns may or not be identical, i.e. formed of the same fiber.
- the textile reinforcement layer may include a first knitted portion that is wholly formed of Kevlar® fibers, carbon fibers, or both Kevlar® and carbon fibers.
- the reinforcement layer may include, in addition to the first plurality of yarns, a second plurality of yarns knitted together to form a second plurality of tricot chain stitches.
- the yarns of this second plurality may define a second knitted portion of the reinforcement layer.
- the yarns of this second plurality may have any tenacity and be formed of any fiber or groups of fibers.
- the yarns of the second plurality are composed of polyester fibers or fibers of substantially equal tenacity.
- the first and/or second pluralities of yarns may have substantially parallel wales and substantially parallel courses of tricot stitches.
- the first and second knitted portions may be interlaced together.
- the wales of a knitted portion may overlap the courses of the other knitted portion and vice versa.
- the first and/or second plurality of reinforcement yarns may be knitted with simple or double chain stitches, and may be formed in accordance with the teachings of patents EP-B1 -0623776 or EP-B1 -0960297, by the Applicant hereof.
- FIG. 1 is a plan view of a first embodiment of the hose of the invention, with certain details omitted;
- FIG. 2 is a plan view of a second embodiment of the hose of the invention, with certain details omitted;
- FIG. 3 is a plan view of a third embodiment of the hose of the invention, with certain details omitted;
- FIG. 4 is a plan view of a fourth embodiment of the hose of the invention, with certain details omitted;
- FIG. 5 is a plan view of a fifth embodiment of the hose of the invention, with certain details omitted;
- FIG. 6 is a schematic view of a hose manufacturing line of the invention. Detailed description of a few preferred embodiments
- the flexible hose 1 of the invention may be a garden hose and be particularly used for irrigation, possibly for domestic watering.
- the flexible hose 1 may comprise a first inner layer or substrate 2, made of a first thermoplastic polymer material, at least one reinforcement layer 3 and at least one second outer layer or skin, made of a second thermoplastic polymer material.
- the first and second polymer materials that form the substrate 2 and the skin 4 respectively may include a plasticized PVC (polyvinyl chloride) based matrix.
- the inner layer 2 and the second layer 4 will be only separated by one or more reinforcement layers 3, at least one whereof is knitted.
- both the first layer 2 and the second layer 4 may be formed by continuous extrusion of their respective thermoplastic materials.
- Additional layers may be also provided in any arrangement, as is typical for this type of hoses, i.e. internal to the first layer 2 and/or external to the second layer 4.
- the reinforcement layer 3 may comprise a first plurality of yarns 5, 5 1 , 5'",... knitted together to form a plurality of tricot stitches 6, 6', 6'"....
- At least one first yarn 5 of the yarns 5, 5', 5'", ... of the first plurality may be a high tenacity fiber, preferably of the above mentioned type, and may have a tenacity of at least 1800 mN/tex, more preferably at least 2000 mN/tex, and most preferably at least 2150 mN/tex.
- more yarns of the first plurality may have the tenacity of the first yarn 5. Any number of such high tenacity yarns may be provided, e.g. two, three, four or eight.
- the reinforcement layer 3 further includes at least one second yarn 5" consisting of a polyester fiber or a fiber of comparable tenacity, coupled to at least the first yarn 5 or further yarns of the first plurality of high tenacity-type yarns.
- the number of yarns having the same tenacity as the second yarn 5" will be greater than the number of yarns having the same tenacity as the first yarn 5.
- the reinforcement layer 3 may be formed of any number of high tenacity fibers or polyester fibers or fibers of equal tenacity.
- the textile reinforcement layer 3 may have substantially parallel wales 7, 7', 7", ... and substantially parallel courses of tricot stitches 8, 8', 8", ....
- the reinforcement layer 3 may be formed in accordance with the teachings of patents EP-B1 -0623776 or EP- B 1-0960297, by the Applicant hereof.
- the reinforcement layer 3 may be spiraled over the bearing layer 2, with wales 7, 7', 7", ... and courses of tricot stitches 8, 8', 8", ... inclined to the longitudinal axis Y of the hose at respective predetermined inclination angles ⁇ , ⁇ .
- the hose of the invention may also include a first knitted portion 3' composed of the yarns 5, 5', 5'", ... of the first plurality and a second knitted portion 3" composed of a second plurality of yarns 10, 10', 10", 10'", ... knitted together with tricot stitches 11 , 11', 11", 11'"....
- the yarns 10, 10', 10", 10'”... of this second plurality may have any tenacity and be formed of any number and type of yarns.
- the second knitted portion 3" may or not be configured like the first knitted portion 3'.
- the second knitted portion 3" of the reinforcement layer 3 may be also formed in accordance with the teachings of patents EP-B1 -0623776 or EP-B1 -0960297, by the Applicant hereof.
- the second knitted portion 3" may be spiraled over the bearing layer 2, with courses of tricot stitches 12, 12', 12", ... and wales 13, 13', 13", ... inclined to the longitudinal axis of the hose at respective predetermined inclination angles ⁇ ', ⁇ '.
- the yarns 5, 5', 5'"... of the first plurality will be of high tenacity type, i.e. will have the same tenacity as the first yarn 5, whereas the yarns of the second plurality will have the same tenacity as the second yarn 10.
- the first 3' and second 3" knitted portions will be interlaced together, so that the wales 7, 7', 1" ... of the first knitted portion 3' overlap the courses of stitches 12, 12', 12"... of the second knitted portion 3" and conversely, the wales 13, 13', 13", ... of the second knitted portion 3" overlap the courses 8, 8', 8", ... of the first knitted portion 3'.
- the hose 1 so obtained will have an even higher burst strength, with maximum values that may even reach 20 bar, i.e. considerably higher than typical peak values for common irrigation hose applications.
- the hose 1 of the invention may be fabricated by the manufacturing line as shown in FIG. 6.
- This line 20 will basically include a first extruder 21 , one or more circular knitting machines 22 and a second extruder 23. Both the extruders 21 , 23 and the circular knitting machine 22 may be of known type.
- the knitting machine 22 may be of known type and configured so that the lines of stitches 8, 8', 8", ... of the reinforcement layer 3 are parallel to the axis of the hose, or may be manufactured in accordance with the teachings of Italian patent IT1270776, to form knitted reinforcement layers spiraled over the bearing layer with tricot stitches, with parallel wales and courses of stitches having opposite inclinations.
- the process for manufacturing the hose 1 may include a first step of extrusion of the first polymer material, that may be introduced in granule form into the first extruder 21 , to obtain the first inner layer or substrate 2, knitting of the reinforcement layer thereon by the knitting machine 22, and a second step of extrusion of the second polymer material on the semifinished product so obtained, which second material may be introduced in granule form into the second extruder 23, to form the second outer layer or cover 4.
- the hose comprises a reinforced layer 3 with two knitted portions 3', 3"
- two knitting machines 22 may be used, one for each of the portions 3', 3", possibly having opposed knitting heads.
- the knitting machines 22 have a rotary spool supporting plate element 24, which supports the spools of the yarns 5, 5', 5", 5'", ... that are designed to form the reinforcement layer 3.
- the spool supporting element 24 will be fitted with as many spools of high tenacity yarn on as many supports, to form the reinforcement layer 3, and the remaining supports will be fitted with the spools of polyester fiber or fiber of equal tenacity.
- the supports of the spool supporting element 24 shall be fitted with three spools of high tenacity yarn, e.g. Kevlar®, and five spools of polyester fiber or fiber of equal tenacity, and the machine shall be operated in a known manner, and possibly with yarn tension adjustment for proper knitting. Through a number of attempts, the skilled person will be able to find the right tension for proper knitting.
- high tenacity yarn e.g. Kevlar®
- the eight supports of the spool supporting element 24 shall be fitted with spools of high tenacity fiber, such as Kevlar®, and the process shall be carried out as above.
- the spool supporting element 24 may have any number of spools, in any ratio of high tenacity yarn spools to polyester fiber spools or spools with fibers of equal tenacity.
- a local heating station 25 will be provided between the two extruding stations 21 , 23 and downstream from the knitting machine 22, for heating the semifinished product comprising the first layer 2 and the knitted reinforcement layer 3.
- this station may include a tunnel kiln for continuous heating of the semifinished product, and particularly the knitted layer.
- the yarns made of polyester or a similar material will expand and then, upon natural or forced cooling, will shrink over the first layer 2 to a greater extent than high tenacity fiber yarns.
- FIGS. 1 to 5 show non limiting embodiments of the invention.
- the yarns may be of any nature and number without departure from the scope as defined in the annexed claims.
- high tenacity yarns or fibers are indicated by full lines, whereas the yarns made of polyester fiber or fiber of equal tenacity, are indicated by simple lines.
- the succession of tricot stitches 6, 6', 6", 6'", ... will form the line 8
- the underlying succession will form the line 8', and so on.
- high tenacity fibers may be selected, for example and without limitation, among the fibers of Table 1.
- a particularly preferred fiber is Kevlar®.
- a tenacity range is also indicated. It shall be noted that, as is known, the tenacity of a fiber depends on various conditions, and that a fiber that has been degraded, e.g. upon knitting thereof with other fibers in a knitting machine, like the circular knitting machine 22, may lose up to 30-40% of its initial tenacity.
- FIG. 1 shows a first embodiment of a hose 1 of the invention, in which the yarns 5, 5 1 are made of a high tenacity fiber and the yarns 5", 5'", ... are made of a polyester fiber.
- FIG. 2 shows a second embodiment of a hose 1 of the invention, which comprises a reinforcement layer 3, with a first plurality of yarns 5, 5'... all made of high tenacity fibers, that constitutes the first knitted portion 3', and a second plurality of yarns 10, 10', 10", 10'"..., that constitutes the second knitted portion 3", made of a polyester fiber or a fiber of equal tenacity.
- the high tenacity yarns 5, 5', 5'", ... of the reinforcement layer 3 form wales 7, 7, 7', 7", ... and courses 8, 8', 8", ... of stitches 6, 6', 6", 6'", ..., whereas the yarns 10, 10', 10", 10'", ... of polyester or similar fiber will form wales 13, 13', 13", ... and courses 12, 12', 12", ... of stitches 11 , 11', 11", 11'"
- FIG. 3 shows a third embodiment of a hose 1 of the invention, in which the reinforcement layer 3 has high tenacity yarns 5, 5', ... and polyester fiber yarns 5", 5'", ....
- the reinforcement layer 3 is spiraled over the bearing layer 2, with the courses of tricot stitches 8, 8', 8", ... and the wales 7, 7', 7", ... inclined to the longitudinal axis Y of the hose at respective predetermined inclination angles ⁇ , ⁇ .
- the knitting machine 22 may be formed according to the teachings of Italian patent IT1270776.
- FIG. 4 shows a fourth embodiment of a hose 1 of the invention, in which the yarns 5, 5', ... are made of a high tenacity fiber and the yarns 5", 5'", ... are made of a polyester fiber. In other words, high tenacity yarns and polyester yarns are in alternate arrangement.
- the reinforcement layer 3 is spiraled over the bearing layer 2, with the courses of tricot stitches 8, 8', 8", ... and the wales 7, 7', 7", ... inclined to the longitudinal axis Y of the hose at respective predetermined inclination angles ⁇ , ⁇ .
- the knitting machine 22 may be formed according to the teachings of Italian patent IT1270776.
- FIG. 5 shows a fifth embodiment of a hose 1 of the invention, which comprises a reinforcement layer 3, with a first knitted portion 3' in which the yarns 5, 5', 5'"... are all made of high tenacity fibers and a second knitted portion 3", wholly made of a polyester fiber yarns 10, 10', 10", 10'"....
- both portions 3 and 3" are spiraled over the underlying layer, with corresponding wales 8, 8', 8", ... and courses 12, 12', 12", ... of tricot stitches 6, 6', 6", 6'", ... and 11 , 11', 11", 11'", ... and courses 7, T, 7", ... and 13, 13', 13", ... inclined to the longitudinal axis Y of the hose at respective predetermined inclination angles ⁇ , ⁇ and ⁇ ', ⁇ '.
- this embodiment may be implemented by two knitting machines 22 or a single knitting machine having two knitting heads, that may be formed in accordance with the teachings of Italian patent IT1270776.
- the invention provides a flexible hose that may be manufactured in a relatively cost-effective, simple and quick manner, ensures considerable high pressure resistance and relative malleability and minimizes kinking.
- hose of the invention is susceptible of a number of changes and variants, within the inventive concept disclosed in the appended claims. All the details thereof may be replaced by other technically equivalent parts, and the materials may vary depending on different needs, without departure from the scope of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
- Knitting Of Fabric (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2010247012A AU2010247012A1 (en) | 2009-05-12 | 2010-05-12 | Reinforced flexible hose with high pressure strenght and method for its manufacturing |
US13/260,528 US20120042980A1 (en) | 2009-05-12 | 2010-05-12 | Reinforced Flexible Hose with High Pressure Strength and Method for its Manufacturing |
CA2707915A CA2707915A1 (en) | 2009-05-12 | 2010-05-12 | Reinforced flexible hose with high pressure strength and method for its manufacturing |
EP10727881A EP2430349A1 (en) | 2009-05-12 | 2010-05-12 | Reinforced flexible hose with high pressure strenght and method for its manufacturing |
ZA2011/07136A ZA201107136B (en) | 2009-05-12 | 2011-09-29 | Reinforced flexible hose with high pressure strength and method for its manufacturing |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09006398.3 | 2009-05-12 | ||
EP09006398 | 2009-05-12 | ||
ITVI2009A000184 | 2009-07-22 | ||
IT000184A ITVI20090184A1 (en) | 2009-07-22 | 2009-07-22 | FLEXIBLE REINFORCED HOSE WITH HIGH PRESSURE RESISTANCE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010131216A1 true WO2010131216A1 (en) | 2010-11-18 |
Family
ID=42711829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2010/052119 WO2010131216A1 (en) | 2009-05-12 | 2010-05-12 | Reinforced flexible hose with high pressure strenght and method for its manufacturing |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120042980A1 (en) |
EP (1) | EP2430349A1 (en) |
AU (1) | AU2010247012A1 (en) |
WO (1) | WO2010131216A1 (en) |
ZA (1) | ZA201107136B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2515017A3 (en) * | 2011-04-21 | 2013-12-04 | REHAU AG + Co | Hose for conveying fluids |
EP2671988A2 (en) | 2012-06-06 | 2013-12-11 | E. I. du Pont de Nemours and Company | Knit fabric and an article comprising same |
CN104405972A (en) * | 2014-11-21 | 2015-03-11 | 台州市路桥正来塑胶厂 | Extensible pipe |
WO2015050853A1 (en) * | 2013-10-02 | 2015-04-09 | E. I. Du Pont De Nemours And Company | Multilayer reinforced hose |
WO2015080607A1 (en) * | 2013-11-27 | 2015-06-04 | Cell-Fast Sp. Zo.O. | Flexible hose |
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US9945054B2 (en) | 2011-06-24 | 2018-04-17 | Federal-Mogul Powertrain, Llc | High temperature resistant weft knit textile sleeve and method of construction thereof |
US10040888B1 (en) | 2013-06-14 | 2018-08-07 | Cooper-Standard Automotive Inc. | Composition including silane-grafted polyolefin |
US10100139B2 (en) * | 2013-08-01 | 2018-10-16 | Cooper-Standard Automotive Inc. | Hose, composition including silane-grafted polyolefin, and process of making a hose |
US10371292B2 (en) | 2014-07-02 | 2019-08-06 | Cooper-Standard Automotive Inc. | Hose, abrasion resistant composition, and process of making a hose |
CN106170386B (en) * | 2014-08-22 | 2018-01-16 | 五行科技股份有限公司 | For exploiting the fracturing liquid delivery hose and its manufacture method of shale oil gas |
US9964237B2 (en) | 2016-02-25 | 2018-05-08 | Nlb Corp. | Hose shroud |
AU2016404620A1 (en) * | 2016-04-29 | 2018-11-22 | Fitt S.P.A. | Enlargeable flexible hose |
JP7040797B2 (en) * | 2016-10-28 | 2022-03-23 | アデガ エス.アール.エル.ウニペルソナーレ | Telescopic corrugated hose and its manufacturing method |
JP6901503B2 (en) | 2016-12-10 | 2021-07-14 | クーパー−スタンダード・オートモーティブ・インコーポレーテッド | Fixing seals, compositions, and how to make them |
CN109563329A (en) | 2016-12-10 | 2019-04-02 | 库珀标准汽车公司 | Polyolefin elastomer composition and preparation method thereof |
US10267437B2 (en) | 2017-01-09 | 2019-04-23 | Yeiser Research & Development LLC | Metal garden hose with strain relief |
IT201700002927A1 (en) * | 2017-01-12 | 2018-07-12 | Fitt Spa | FLEXIBLE REINFORCED TUBE, AS WELL AS APPARATUS AND METHOD FOR REALIZING THE SAME |
CN107079765B (en) * | 2017-04-10 | 2019-08-20 | 阜南佳利工艺品有限公司 | A kind of implantation methods improving purple willow toughness |
GB2578757B (en) * | 2018-11-07 | 2023-07-12 | Exel Ind Sa | Hose arrangements |
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EP1780458A2 (en) * | 2005-10-25 | 2007-05-02 | Hutchinson | Fluid transfer hose having a knitted textile reinforcement layer |
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-
2010
- 2010-05-12 WO PCT/IB2010/052119 patent/WO2010131216A1/en active Application Filing
- 2010-05-12 EP EP10727881A patent/EP2430349A1/en not_active Withdrawn
- 2010-05-12 US US13/260,528 patent/US20120042980A1/en not_active Abandoned
- 2010-05-12 AU AU2010247012A patent/AU2010247012A1/en not_active Abandoned
-
2011
- 2011-09-29 ZA ZA2011/07136A patent/ZA201107136B/en unknown
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US4898212A (en) * | 1984-10-01 | 1990-02-06 | Eaton Corporation | Fatigue resistant hose |
EP0623776B1 (en) | 1993-05-13 | 1996-02-14 | FITT S.p.A. | Mesh, network hose |
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EP0726416A1 (en) * | 1995-02-10 | 1996-08-14 | The Goodyear Tire & Rubber Company | Hose having knitted reinforcement |
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EP1156252B1 (en) | 2000-05-18 | 2004-05-12 | UNIFLEX UTILTIME S.p.A. | Flexible hose, in particular for watering applications |
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US20080072984A1 (en) * | 2006-09-26 | 2008-03-27 | Morris Branch | Fluid transfer hose reinforced with hybrid yarn |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2515017A3 (en) * | 2011-04-21 | 2013-12-04 | REHAU AG + Co | Hose for conveying fluids |
EP2671988A2 (en) | 2012-06-06 | 2013-12-11 | E. I. du Pont de Nemours and Company | Knit fabric and an article comprising same |
US9188255B2 (en) | 2012-06-06 | 2015-11-17 | E I Du Pont De Nemours And Company | Knit fabric and an article comprising same |
US9593784B2 (en) | 2012-06-06 | 2017-03-14 | E I Du Pont De Nemours And Company | Knit fabric and an article comprising same |
WO2015050853A1 (en) * | 2013-10-02 | 2015-04-09 | E. I. Du Pont De Nemours And Company | Multilayer reinforced hose |
WO2015080607A1 (en) * | 2013-11-27 | 2015-06-04 | Cell-Fast Sp. Zo.O. | Flexible hose |
RU2649742C1 (en) * | 2013-11-27 | 2018-04-04 | Селл-Фаст Сп. З О.О. | Flexible hose |
CN104405972A (en) * | 2014-11-21 | 2015-03-11 | 台州市路桥正来塑胶厂 | Extensible pipe |
Also Published As
Publication number | Publication date |
---|---|
EP2430349A1 (en) | 2012-03-21 |
US20120042980A1 (en) | 2012-02-23 |
ZA201107136B (en) | 2013-01-30 |
AU2010247012A1 (en) | 2011-11-03 |
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