WO2009040610A1 - High flexibility hose structure for high pressure apparatus, and method for making same - Google Patents
High flexibility hose structure for high pressure apparatus, and method for making same Download PDFInfo
- Publication number
- WO2009040610A1 WO2009040610A1 PCT/IB2007/053910 IB2007053910W WO2009040610A1 WO 2009040610 A1 WO2009040610 A1 WO 2009040610A1 IB 2007053910 W IB2007053910 W IB 2007053910W WO 2009040610 A1 WO2009040610 A1 WO 2009040610A1
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- WIPO (PCT)
- Prior art keywords
- layer
- hose structure
- intermediate layer
- inner layer
- hose
- Prior art date
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Classifications
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- 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
- B32B1/00—Layered products having a general shape other than plane
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- 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
-
- 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
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
-
- 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
- B32B2274/00—Thermoplastic elastomer material
-
- 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
- B32B2307/536—Hardness
-
- 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
Definitions
- the present invention finds application in the field of flexible hoses, and particularly relates to a high flexibility hose structure, particularly for high pressure applications.
- the invention further relates to a method for making such high flexibility hose.
- Flexible hoses in general, and particularly hoses designed for high pressure devices, e.g. exposed to a pressure from 100 to 200 bar, are subjected in operation to torsional and/or bending stresses, which tend to create bulges, i.e. bends with a small radius of curvature, commonly known as kinking.
- This problem particularly arises in pressure washers, in which a drum device is typically used, in operation, to wind the hose in concentric more or less adjacent turns.
- Flexible hoses particularly for use in pressure washers, generally have an inner layer and an outer layer, both formed of a thermoplastic material, with an intermediate layer of braided-fiber fabric therebetween. The latter is usually fixed to the inner layer, generally bonded and glued thereto. Examples of these prior art structures are disclosed in US-A-4380252 and US-A-5964409.
- hoses tend to become plastically and permanently deformed at the bending area, and hence to choke.
- a structurally weakened area is generated in the hose wall, which can lead to straining and ruptures, as well as considerable pressure drops in fluid flow.
- such prior art hoses may be not suitable for proper winding in concentric turns on the winding device as described above, as well as for common use.
- the object of the present invention is to overcome the above drawbacks, by providing a hose that is highly efficient and relatively cost-effective.
- a particular object is to provide a high flexibility hose for high pressure applications that limits kinking.
- Another object of the invention is to provide a high pressure-resistant, durable hose.
- a hose structure as defined in claim 1 which comprises at least one inner layer, at least one outer layer, at least one intermediate layer interposed therebetween, characterized in that said at least one intermediate layer is substantially in contact and uniformly coupled with said at least one inner layer and said at least one outer layer, so as to be radially constrained therebetween, though allowing mutual longitudinal sliding thereof.
- the invention relates to a method for making the above flexible hose in accordance with claim 20, characterized in that said at least one intermediate layer is laid in such a manner as to be substantially in contact and informally coupled with both said at least one inner layer and to said at least one outer layer, to be radially constrained therebetween though allowing mutual longitudinal sliding between the layers.
- the invention relates to a high pressure apparatus, such as a pressure washer or a similar apparatus as defined in claim 26, comprising the above described and claimed hose structure.
- FIG. 1 is a sectional view of the hose of the invention
- FIG. 2 is an enlarged view of certain details of the hose of the invention
- FIGS. 3 to 5 show various steps of the method for making the flexible hose of the invention
- FIG. 6 is another sectional view of the hose of the invention, as taken along a plane Vl-Vl.
- the hose structure of the invention may be advantageously used for high pressure apparatus, such as pressure washers or similar devices, for delivering a working fluid, such as water and/or steam, using special means such as a tube, a nozzle or the like for delivering it onto a surface to be treated.
- high pressure apparatus such as pressure washers or similar devices
- a working fluid such as water and/or steam
- the hose structure 1 may be composed of an inner layer 2, which may be formed of a first thermoplastic polymeric material, an outer layer 3, which may be composed of a second thermoplastic polymeric material, and an intermediate layer 4 located therebetween.
- Both the first polymeric material of the inner layer 2 and the second polymeric material of the outer layer 3 may be independently selected from the group comprising PVC (polyvinyl chloride), TPU (thermoplastic polyurethane), TPE (thermoplastic elastomer), TPE-V (vulcanized thermoplastic elastomer) or mixtures of these materials. Also, they may be either identical or different from each other and have various colors depending on the needs of the final user.
- one of the above thermoplastic polymeric materials, and preferably the first, may have a Shore A hardness of less than 90, as measured according to the ISO 868 standard.
- thermoplastic polymeric materials are selected with Shore A hardness values in the range from 60 to 90, preferably from 74 to 80, and more preferably of about 78.
- the material used for the intermediate layer 4 may be a braided-fiber fabric, as shown in Figure 4, i.e. composed of intermeshing fibers 5, 5', 5".
- the fibers 5, 5', 5" may be grouped into sets of substantially parallel adjacent fibers 7, T, 7", which are intermeshed with other sets 7, 7', 7" transverse to the former, as schematically shown in Figure 4.
- Other intermeshing arrangements may be possibly used for the same purposes and with the same functions.
- the fibers may be of a synthetic nature and may be selected from aramid, polyester, polyamide fibers or a mixture thereof. In a preferred embodiment, the fibers may be of polyester type.
- the intermediate layer 4 may cover the whole outer surface of the inner layer 2, to impart high pressure resistance to the whole structure 1.
- the yarn count of the fibers 5, 5', 5" depends on the operating pressure of the hose structure 1.
- the yarn count of the braided fibers 5, 5', 5" may be in a range from 2200 dtex to 13200 dtex, and preferably from 6600 dtex to 8800 dtex.
- fibers of such size allow a hose structure capable to withstand operating pressures in a range from 100 to 200 bar, and at least to 140 bar.
- the intermediate layer 4 is substantially in contact and coupled both to the inner layer 2 and to the outer layer 3, in such a manner as to be constrained therebetween radially, i.e. along a direction Y perpendicular to the axis X of the hose, while being allowed to slide longitudinally, i.e. along the direction coincident with the axis X of the hose.
- both the inner layer 2 and the outer layer 3 are directly in contact with the intermediate layer 4, i.e. without any clearance with its fibers 5, 5', 5", so that they can oppose the radial forces generated by the pressurized fluid, while allowing their relative sliding motion.
- the hose structure of the invention is subjected to minimal kinking.
- the intermerdiate layer 4 will be longitudinally unrestrained, thereby allowing free mutual sliding of the fibers 5, 5', 5" between the lower and upper layers 2, 3, which are in turn free to elastically recover their original shape.
- the contact fit between the intermediate layer 4 and the inner and outer layers 2, 3 will further allow optimal operation of the above mechanism, as the layers 2, 3 above and below the intermediate layer 4 will act as a "guide” for this latter, preventing any overlapping of the fibers 5, 5 ⁇ 5" during their sliding motion.
- the fibers 5, 5 ⁇ 5" of the layer 4 are braided on the inner layer 2, but not permanently coupled to the inner layer 2 and to the outer layer 2. This means that the intermediate layer is neither glued, nor heat sealed, nor permanently joined in any manner to the inner and outer layers 2, 3.
- the materials that constitute the inner layer 2, the outer layer 3 and the intermediate layer 4 will be selected amongst high flowability materials, to allow easy sliding thereof. If the dynamic friction factor f d is used as a flowability parameter, materials may be selected in which such factor of 0.2 to 0.5, preferably of 0.25 to 0.45 and more preferably of 0.3 to 0.4.
- the structure 1 may include lubricating means, such as a layer of materials such as talc, graphite or the like, interposed between the intermediate layer 4 and the inner layer 2 and/or the outer layer 3.
- lubricating means such as a layer of materials such as talc, graphite or the like, interposed between the intermediate layer 4 and the inner layer 2 and/or the outer layer 3.
- the method for making the hose structure of the invention may include the following steps, as shown with reference to Figures 3 to 6.
- an inner tubular layer 2 is formed with the cross section as shown in Fig. 3, preferably by extruding a first thermoplastic polymeric material in a traditional manner.
- the rough semifinished product so obtained may be subjected to a first inflation step, such as by blowing compressed air therein at a pressure of 2 to 8 bar so that it can be slightly expanded until its inside diameter reaches a first predetermined value D 1 .
- This inflation step will add flexibility to the structure, and further increase resistance to inward pressure exerted by the subsequent step of deposition of the intermediate layer 4.
- the inside diameter D 1 will be in a range from 4 mm to 10 mm, preferably of about 6 mm.
- the next step will consist in laying the intermediate layer 4 on the inflated inner layer 2, by braiding the fibers 5, 5', 5" to obtain a semifinished product 6 as shown in Figure 4.
- the fibers 5, 5', 5" will be laid in direct contact with the outer surface of the inner layer 2, without exerting an excessive stress, to facilitate sliding of contacting layers.
- the fibers and their yarn count will be selected in such a manner that the thickness of the intermediate layer 4 is in a range from 0.5 mm to 1.5 mm and preferably of about 0.9 mm.
- a second step of inflation with compressed air may be provided, as shown in Figure 5, in which the semifinished product 6, formed of the inner layer 2 with the intermediate layer 4 braided thereon, is expanded to a second inside diameter D 2 , which will be substantially coincident with the inside diameter of the finished product, and very close to the first inside diameter D 1 .
- a layer of a second polymeric material identical or different from the former, is extruded to a thickness of 0.8 mm to 1.2 mm, and preferably of about 1 mm, possibly of different color from the former.
- the layer will be laid on the semifinished product 6, to form the outer layer, thereby obtaining the finished hose structure 1 as shown in Figure 6, operating in the same manner as with the intermediate layer, i.e. taking care that a clearance-free longitudinally sliding contact is practically obtained.
- the various layers will be substantially free to slide relative to each other, for enhanced elastic deformation thereof and easy recovery of the initial configuration.
- hose structure 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.
Abstract
A hose structure, particularly for high pressure applications, comprises an inner layer (2) of a first thermoplastic polymeric material, an outer layer (3) of a second thermoplastic polymeric material (4) and an intermediate layer (4) interposed therebetween. The intermediate layer (4) comprises a braided fiber fabric (5, 5', 5') radially but not longitudinally held between said at least one inner layer (4) and said at least one outer layer (3) to allow free mutual sliding of the various layers when the hose is subjected to bending stresses. A method for making such structure.
Description
HIGH FLEXIBILITY HOSE STRUCTURE FOR HIGH PRESSURE APPARATUS, AND METHOD FOR MAKING SAME
Field of the invention
The present invention finds application in the field of flexible hoses, and particularly relates to a high flexibility hose structure, particularly for high pressure applications.
The invention further relates to a method for making such high flexibility hose.
Background of the invention
Flexible hoses in general, and particularly hoses designed for high pressure devices, e.g. exposed to a pressure from 100 to 200 bar, are subjected in operation to torsional and/or bending stresses, which tend to create bulges, i.e. bends with a small radius of curvature, commonly known as kinking. This problem particularly arises in pressure washers, in which a drum device is typically used, in operation, to wind the hose in concentric more or less adjacent turns.
Flexible hoses, particularly for use in pressure washers, generally have an inner layer and an outer layer, both formed of a thermoplastic material, with an intermediate layer of braided-fiber fabric therebetween. The latter is usually fixed to the inner layer, generally bonded and glued thereto. Examples of these prior art structures are disclosed in US-A-4380252 and US-A-5964409.
One drawback of the above structures is that, due to kinking, hoses tend to become plastically and permanently deformed at the bending area, and hence to choke. As a result, a structurally weakened area is generated in the hose wall, which can lead to straining and ruptures, as well as considerable pressure drops in fluid flow.
As a consequence, such prior art hoses may be not suitable for proper winding in concentric turns on the winding device as described above, as well as for common use.
Summary of the invention
The object of the present invention is to overcome the above drawbacks, by providing a hose that is highly efficient and relatively cost-effective.
A particular object is to provide a high flexibility hose for high pressure applications that limits kinking.
Another object of the invention is to provide a high pressure-resistant, durable hose.
These and other objects, as better explained hereinafter, are fulfilled by a hose structure as defined in claim 1 , which comprises at least one inner layer, at least one outer layer, at least one intermediate layer interposed therebetween, characterized in that said at least one intermediate layer is substantially in contact and uniformly coupled with said at least one inner layer and said at least one outer layer, so as to be radially constrained therebetween, though allowing mutual longitudinal sliding thereof.
In another aspect, the invention relates to a method for making the above flexible hose in accordance with claim 20, characterized in that said at least one intermediate layer is laid in such a manner as to be substantially in contact and informally coupled with both said at least one inner layer and to said at least one outer layer, to be radially constrained therebetween though allowing mutual longitudinal sliding between the layers.
In another aspect, the invention relates to a high pressure apparatus, such as a pressure washer or a similar apparatus as defined in claim 26, comprising the
above described and claimed hose structure.
Advantageous embodiments of the invention are defined in accordance with the dependent claims.
Brief description of drawings
Further features and advantages of the invention will be more apparent upon reading the detailed description of a preferred, non-exclusive embodiment of a flexible hose according to the invention, which is described as a non-limiting example with the help of the annexed drawings, in which: FIG. 1 is a sectional view of the hose of the invention; FIG. 2 is an enlarged view of certain details of the hose of the invention; FIGS. 3 to 5 show various steps of the method for making the flexible hose of the invention;
FIG. 6 is another sectional view of the hose of the invention, as taken along a plane Vl-Vl.
Detailed description of a preferred embodiment
Referring to the above figures, the hose structure of the invention, generally designated by numeral 1 , may be advantageously used for high pressure apparatus, such as pressure washers or similar devices, for delivering a working fluid, such as water and/or steam, using special means such as a tube, a nozzle or the like for delivering it onto a surface to be treated.
As shown in Figures 1 and 2, the hose structure 1 may be composed of an inner layer 2, which may be formed of a first thermoplastic polymeric material, an outer layer 3, which may be composed of a second thermoplastic polymeric material, and an intermediate layer 4 located therebetween.
It shall be understood that multiple respective inner, outer and intermediate layers,
in the same relative positions as described above may be provided instead of single layers, without departure from the scope of the invention.
Both the first polymeric material of the inner layer 2 and the second polymeric material of the outer layer 3 may be independently selected from the group comprising PVC (polyvinyl chloride), TPU (thermoplastic polyurethane), TPE (thermoplastic elastomer), TPE-V (vulcanized thermoplastic elastomer) or mixtures of these materials. Also, they may be either identical or different from each other and have various colors depending on the needs of the final user.
Advantageously, one of the above thermoplastic polymeric materials, and preferably the first, may have a Shore A hardness of less than 90, as measured according to the ISO 868 standard.
Conveniently, the above thermoplastic polymeric materials are selected with Shore A hardness values in the range from 60 to 90, preferably from 74 to 80, and more preferably of about 78.
The material used for the intermediate layer 4 may be a braided-fiber fabric, as shown in Figure 4, i.e. composed of intermeshing fibers 5, 5', 5".
In a possible embodiment, the fibers 5, 5', 5" may be grouped into sets of substantially parallel adjacent fibers 7, T, 7", which are intermeshed with other sets 7, 7', 7" transverse to the former, as schematically shown in Figure 4. Other intermeshing arrangements may be possibly used for the same purposes and with the same functions.
The fibers may be of a synthetic nature and may be selected from aramid, polyester, polyamide fibers or a mixture thereof. In a preferred embodiment, the fibers may be of polyester type.
In a preferred embodiment, the intermediate layer 4 may cover the whole outer
surface of the inner layer 2, to impart high pressure resistance to the whole structure 1.
The yarn count of the fibers 5, 5', 5" depends on the operating pressure of the hose structure 1. Thus, the yarn count of the braided fibers 5, 5', 5" may be in a range from 2200 dtex to 13200 dtex, and preferably from 6600 dtex to 8800 dtex.
Experimental tests have shown that fibers of such size allow a hose structure capable to withstand operating pressures in a range from 100 to 200 bar, and at least to 140 bar.
A peculiar feature of the invention is that the intermediate layer 4 is substantially in contact and coupled both to the inner layer 2 and to the outer layer 3, in such a manner as to be constrained therebetween radially, i.e. along a direction Y perpendicular to the axis X of the hose, while being allowed to slide longitudinally, i.e. along the direction coincident with the axis X of the hose. In other words, both the inner layer 2 and the outer layer 3 are directly in contact with the intermediate layer 4, i.e. without any clearance with its fibers 5, 5', 5", so that they can oppose the radial forces generated by the pressurized fluid, while allowing their relative sliding motion.
This can occur both due to the lack of glues and adhesives between the intermediate layer 4 and the inner 2 and outer layer 3, and thanks to the sliding properties of the materials being used.
Thanks to this configuration, the hose structure of the invention is subjected to minimal kinking. As the hose is subjected to a bending stress that causes the formation of bulges, the intermerdiate layer 4 will be longitudinally unrestrained, thereby allowing free mutual sliding of the fibers 5, 5', 5" between the lower and upper layers 2, 3, which are in turn free to elastically recover their original shape.
The contact fit between the intermediate layer 4 and the inner and outer layers 2, 3
will further allow optimal operation of the above mechanism, as the layers 2, 3 above and below the intermediate layer 4 will act as a "guide" for this latter, preventing any overlapping of the fibers 5, 5\ 5" during their sliding motion.
In a preferred non exclusive embodiment of the invention, the fibers 5, 5\ 5" of the layer 4 are braided on the inner layer 2, but not permanently coupled to the inner layer 2 and to the outer layer 2. This means that the intermediate layer is neither glued, nor heat sealed, nor permanently joined in any manner to the inner and outer layers 2, 3.
Advantageously, the materials that constitute the inner layer 2, the outer layer 3 and the intermediate layer 4 will be selected amongst high flowability materials, to allow easy sliding thereof. If the dynamic friction factor fd is used as a flowability parameter, materials may be selected in which such factor of 0.2 to 0.5, preferably of 0.25 to 0.45 and more preferably of 0.3 to 0.4.
The use of materials having such function factor fd will further enhance relative longitudinal sliding of the various layers, thereby imparting greater flexibility to the structure as a whole.
In a variant embodiment, the structure 1 may include lubricating means, such as a layer of materials such as talc, graphite or the like, interposed between the intermediate layer 4 and the inner layer 2 and/or the outer layer 3.
The method for making the hose structure of the invention may include the following steps, as shown with reference to Figures 3 to 6.
In the first step, an inner tubular layer 2 is formed with the cross section as shown in Fig. 3, preferably by extruding a first thermoplastic polymeric material in a traditional manner.
The rough semifinished product so obtained may be subjected to a first inflation
step, such as by blowing compressed air therein at a pressure of 2 to 8 bar so that it can be slightly expanded until its inside diameter reaches a first predetermined value D1. This inflation step will add flexibility to the structure, and further increase resistance to inward pressure exerted by the subsequent step of deposition of the intermediate layer 4.
By way of mere example, using an inner layer 2 as thick as 1 mm to 1.5 mm, for instance of about 1 mm, the inside diameter D1 will be in a range from 4 mm to 10 mm, preferably of about 6 mm.
The next step will consist in laying the intermediate layer 4 on the inflated inner layer 2, by braiding the fibers 5, 5', 5" to obtain a semifinished product 6 as shown in Figure 4. During such step, the fibers 5, 5', 5" will be laid in direct contact with the outer surface of the inner layer 2, without exerting an excessive stress, to facilitate sliding of contacting layers. The fibers and their yarn count will be selected in such a manner that the thickness of the intermediate layer 4 is in a range from 0.5 mm to 1.5 mm and preferably of about 0.9 mm.
To compensate for any reduction of the diameter of the inner layer 2, caused by the fiber braiding step, a second step of inflation with compressed air may be provided, as shown in Figure 5, in which the semifinished product 6, formed of the inner layer 2 with the intermediate layer 4 braided thereon, is expanded to a second inside diameter D2, which will be substantially coincident with the inside diameter of the finished product, and very close to the first inside diameter D1.
This is followed by a step in which a layer of a second polymeric material, identical or different from the former, is extruded to a thickness of 0.8 mm to 1.2 mm, and preferably of about 1 mm, possibly of different color from the former. The layer will be laid on the semifinished product 6, to form the outer layer, thereby obtaining the finished hose structure 1 as shown in Figure 6, operating in the same manner as with the intermediate layer, i.e. taking care that a clearance-free longitudinally sliding contact is practically obtained.
From the foregoing description, it is apparent that the hose structure of the invention fulfills the intended objects and particularly meets the requirement of providing a flexible hose subjected to minimal kinking.
Indeed, due to the contact fit of the intermediate layer 4 between the inner and outer layers 2, 3 which hold it in the radial direction and not longitudinally, as the hose 1 is subjected to tensile, bending or torsional stresses, the various layers will be substantially free to slide relative to each other, for enhanced elastic deformation thereof and easy recovery of the initial configuration.
The hose structure 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.
While the hose structure has been described with particular reference to the accompanying figures, the numerals referred to in the disclosure and claims are only used for the sake of a better intelligibility of the invention and shall not be intended to limit the claimed scope in any manner.
Claims
1. A high flexibility hose structure, particularly for high pressure apparatus, comprising: - at least one inner layer (2);
- at least one outer layer (3);
- at least one intermediate layer (4) interposed between said at least one inner layer (2) and said at least one another layer (3); characterized in that said at least one intermediate layer (4) is substantially in contact and uniformly coupled both to said at least one inner layer (2) and to said at least one outer layer (3), to be radially constrained therebetween, though allowing mutual longitudinal sliding between the same layers (2, 3).
2. Hose structure as claimed in claim 1 , wherein said at least one inner layer (2) is formed of a first thermoplastic polymeric material and said at least one outer layer (3) is formed of a second thermoplastic polymeric material.
3. Hose structure as claimed in claim 2, wherein said first and said second thermoplastic polymeric materials are the same.
4. Hose structure as claimed in any one of claims 1 to 3, wherein said first and said second thermoplastic polymeric materials are selected from the group comprising PVC, TPU, TPE, TPE-V or mixtures thereof.
5. Hose structure as claimed in claim 4, wherein at least one of said first and second thermoplastic polymeric materials has a Shore A hardness of less than 90, as measured under the ISO 868 standard.
6. Hose structure as claimed in one or more of the preceding claims, wherein at least one of said first and second thermoplastic polymeric materials has a Shore A hardness in a range from 60 to 90.
7. Hose structure as claimed in one or more of the preceding claims, wherein said first thermoplastic polymeric material has a Shore A hardness in a range from 74 to 80 and preferably of about 78.
8. Hose structure as claimed in one or more of the preceding claims, wherein said intermediate layer (4) is formed of a fabric composed of braided fibers (5, 5', 5").
9. Hose structure as claimed in the preceding claim, wherein said fibers (5, 5', 5") comprise synthetic fibers.
10. Hose structure as claimed in claim 9, wherein said synthetic fibers (5, 5', 5") are selected from the group comprising aramid, polyester, polyamide fibers or mixtures thereof.
11. Hose structure as claimed in one or more of the preceding claims, wherein said intermediate layer (4) covers the whole outer surface of said inner layer (2).
12. Hose structure as claimed in one or more of the preceding claims, wherein the yarn count of said braided fibers (5, 5', 5") is in a range from 2200 dtex to
13200 dtex, and preferably from 6600 dtex to 8800 dtex.
13. Hose structure as claimed in one or more of the preceding claims, wherein the inside diameter of said inner layer (2) is of 4 mm to 10 mm, and preferably of about 6 mm.
14. Hose structure as claimed in one or more of the preceding claims, wherein the thickness of said inner layer is of 1 mm to 1.5 mm, and preferably of about 1 mm.
15. Hose structure as claimed in one or more of the preceding claims, wherein the thickness of said intermediate layer (4) is of 0.5 mm to 1.5 mm, and preferably of about 0.9 mm.
16. Hose structure as claimed in one or more of the preceding claims, wherein the thickness of said outer layer (3) is of 0.8 mm to 1.2 mm, and preferably of about 1 mm.
17. Hose structure as claimed in claim 1 , wherein the dynamic friction factor (fd) between said inner (2) and outer layers (3) and said intermediate layer (4) is of 0.2 to 0.5 and preferably of 0.25 to 0.45.
18. Hose structure as claimed in one or more of the preceding claims, wherein lubricating means are interposed between said intermediate layer (4) and said inner layer (2) and/or said outer layer (3).
19. Hose structure as claimed in the preceding claim, wherein said lubricating means include a layer of talc or similar material.
20. A method for making a high flexibility hose structure as claimed in one or more of the preceding claims comprising the following steps of: - forming at least one inner tubular layer (2) of a first polymeric material;
- laying at least one intermediate layer (4) of fibrous material on said inner tubular layer (2);
- forming at least one outer tubular layer (3) of a second polymeric material on said intermediate layer (4); characterized in that said at least one intermediate layer (4) is laid in such a manner as to be substantially in contact and uniformly coupled both to said at least one inner layer (2) and to said at least one outer layer (3), to be radially constrained therebetween, although allowing mutual longitudinal sliding of the same layers (2, 3).
21. Method as claimed in claim 20, wherein said step of forming said at least one inner layer (2) comprises a first internal inflation step to expand the inside diameter of said layer (2) to a first predetermined value (Di).
22. Method as claimed in claim 21 , wherein said intermediate layer (4) is laid on said inner layer (2) to form a semifinished product (6) whish is subjected to a second internal inflation step to expand the inside diameter of said inner layer (2) to a second predetermined value (D2).
23. Method as claimed in claim 21 or 22, wherein said first inflation step and/or said second inflation step are carried out at a pressure of 2 to 8 bar.
24. Method as claimed in claims 21 to 23, wherein said at least one outer layer (3) is formed by extrusion of said second polymeric material on said semifinished product (6).
25. Method as claimed in claim 21 , wherein said intermediate layer (4) is a fabric formed by braiding fibers (5, 5', 5") on the outer surface of said inner layer (2).
26. A high pressure apparatus, such as a pressure washer or a similar machine, comprising a hose structure as claimed in one or more of claims 1 to 20.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/IB2007/053910 WO2009040610A1 (en) | 2007-09-26 | 2007-09-26 | High flexibility hose structure for high pressure apparatus, and method for making same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/IB2007/053910 WO2009040610A1 (en) | 2007-09-26 | 2007-09-26 | High flexibility hose structure for high pressure apparatus, and method for making same |
Publications (1)
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WO2009040610A1 true WO2009040610A1 (en) | 2009-04-02 |
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Family Applications (1)
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PCT/IB2007/053910 WO2009040610A1 (en) | 2007-09-26 | 2007-09-26 | High flexibility hose structure for high pressure apparatus, and method for making same |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011087435A1 (en) * | 2010-01-13 | 2011-07-21 | Mips Ab | Intermediate layer of friction decreasing material |
EP2290278A3 (en) * | 2009-08-25 | 2012-05-30 | Schieffer Co. International L.C. | Hybrid high pressure hose |
US8708955B2 (en) | 2008-06-02 | 2014-04-29 | Loma Vista Medical, Inc. | Inflatable medical devices |
US9046201B1 (en) | 2012-01-04 | 2015-06-02 | Schieffer Co. International L.C. | High pressure highly flexible, stable in length, thermoplastic hose and method of making the same |
US9592119B2 (en) | 2010-07-13 | 2017-03-14 | C.R. Bard, Inc. | Inflatable medical devices |
US10188436B2 (en) | 2010-11-09 | 2019-01-29 | Loma Vista Medical, Inc. | Inflatable medical devices |
US10188273B2 (en) | 2007-01-30 | 2019-01-29 | Loma Vista Medical, Inc. | Biological navigation device |
CN110948921A (en) * | 2019-12-16 | 2020-04-03 | 浙江民安消防设备有限公司 | Aramid fiber-polyurethane lined fire hose and manufacturing method thereof |
EP3666516B1 (en) | 2018-12-12 | 2022-01-26 | Veritas Ag | Fluid conduit for guiding a fluid |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1961068A1 (en) * | 1969-12-05 | 1971-06-09 | Holder Geb | Crop spraying pump and pipe |
EP0074747A1 (en) * | 1981-09-14 | 1983-03-23 | Parker Hannifin Corporation | Hose construction |
US6179008B1 (en) * | 1996-02-09 | 2001-01-30 | The Yokohama Rubber Co., Ltd. | Thermoplastic elastomer composition, process for the preparation there of, hose made by using the composition, and process for the production thereof |
DE20114122U1 (en) * | 2000-10-16 | 2001-12-20 | Uniflex Utiltime Spa | Flexible hose for irrigation |
-
2007
- 2007-09-26 WO PCT/IB2007/053910 patent/WO2009040610A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1961068A1 (en) * | 1969-12-05 | 1971-06-09 | Holder Geb | Crop spraying pump and pipe |
EP0074747A1 (en) * | 1981-09-14 | 1983-03-23 | Parker Hannifin Corporation | Hose construction |
US6179008B1 (en) * | 1996-02-09 | 2001-01-30 | The Yokohama Rubber Co., Ltd. | Thermoplastic elastomer composition, process for the preparation there of, hose made by using the composition, and process for the production thereof |
DE20114122U1 (en) * | 2000-10-16 | 2001-12-20 | Uniflex Utiltime Spa | Flexible hose for irrigation |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10188273B2 (en) | 2007-01-30 | 2019-01-29 | Loma Vista Medical, Inc. | Biological navigation device |
US8708955B2 (en) | 2008-06-02 | 2014-04-29 | Loma Vista Medical, Inc. | Inflatable medical devices |
US9186488B2 (en) | 2008-06-02 | 2015-11-17 | Loma Vista Medical, Inc. | Method of making inflatable medical devices |
US9504811B2 (en) | 2008-06-02 | 2016-11-29 | Loma Vista Medical, Inc. | Inflatable medical devices |
EP2290278A3 (en) * | 2009-08-25 | 2012-05-30 | Schieffer Co. International L.C. | Hybrid high pressure hose |
US8714203B2 (en) | 2009-08-25 | 2014-05-06 | Schieffer Co. International L.C. | Hybrid high pressure hose |
WO2011087435A1 (en) * | 2010-01-13 | 2011-07-21 | Mips Ab | Intermediate layer of friction decreasing material |
US9592119B2 (en) | 2010-07-13 | 2017-03-14 | C.R. Bard, Inc. | Inflatable medical devices |
US10188436B2 (en) | 2010-11-09 | 2019-01-29 | Loma Vista Medical, Inc. | Inflatable medical devices |
US9046201B1 (en) | 2012-01-04 | 2015-06-02 | Schieffer Co. International L.C. | High pressure highly flexible, stable in length, thermoplastic hose and method of making the same |
EP3666516B1 (en) | 2018-12-12 | 2022-01-26 | Veritas Ag | Fluid conduit for guiding a fluid |
CN110948921A (en) * | 2019-12-16 | 2020-04-03 | 浙江民安消防设备有限公司 | Aramid fiber-polyurethane lined fire hose and manufacturing method thereof |
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