CA2699400A1 - Flexible hose made of reclaimed pvc and method of making same - Google Patents
Flexible hose made of reclaimed pvc and method of making same Download PDFInfo
- Publication number
- CA2699400A1 CA2699400A1 CA2699400A CA2699400A CA2699400A1 CA 2699400 A1 CA2699400 A1 CA 2699400A1 CA 2699400 A CA2699400 A CA 2699400A CA 2699400 A CA2699400 A CA 2699400A CA 2699400 A1 CA2699400 A1 CA 2699400A1
- Authority
- CA
- Canada
- Prior art keywords
- hose
- polymer material
- polyvinyl chloride
- reclaimed
- total weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000002861 polymer material Substances 0.000 claims abstract description 75
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 74
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 73
- 239000011159 matrix material Substances 0.000 claims abstract description 29
- 230000002262 irrigation Effects 0.000 claims abstract description 5
- 238000003973 irrigation Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 239000004753 textile Substances 0.000 claims 1
- 229920002554 vinyl polymer Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 239000004744 fabric Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009954 braiding Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- 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
-
- 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
- F16L11/045—Hoses, i.e. flexible pipes made of rubber or flexible plastics with four or more layers without reinforcement
-
- 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
- B32B2272/00—Resin or rubber layer comprising scrap, waste or recycling material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Materials For Medical Uses (AREA)
Abstract
A flexible irrigation hose, comprising at least one first inner shell (2) made of a first polymer material comprising a reclaimed polyvinyl chloride-based matrix and an external protecting film (3) made of a second polymer material which is compatible with said first polymer material, wherein the reclaimed polyvinyl chloride represents an amount of at least 70% based on the total weight of the hose. A method of making such hose.
Description
FLEXIBLE HOSE MADE OF RECLAIMED PVC AND METHOD OF MAKING
SAME
Field of the invention The present invention generally finds application in the field of flexible hoses, and particularly relates to a flexible hose made of polyvinyl chloride, having a high reclaimed content. Another object of the invention is a method of making such hose.
Background art Flexible irrigation hoses are known which generally include an inner layer or substrate in direct contact with the liquid to be conveyed, a second layer, or cover, a reinforcement fabric layer interposed therebetween and an outer protective film.
The inner layer is formed of reclaimed polyvinyl chloride, whereas the remaining layers are formed of virgin polyvinyl chloride. Generally, the reclaimed polyvinyl chloride content is lower than 50% based on the total weight of the hose.
A technical prejudice has prevailed heretofore in the industry of flexible hoses, that a flexible hose with a high reclaimed polyvinyl chloride content is of lower quality than a hose wholly composed of virgin polyvinyl chloride.
Disclosure of the invention The object of the present invention is to at least partially overcome the above drawbacks, by providing a flexible hose made of a polymer material with a very low environmental impact.
SAME
Field of the invention The present invention generally finds application in the field of flexible hoses, and particularly relates to a flexible hose made of polyvinyl chloride, having a high reclaimed content. Another object of the invention is a method of making such hose.
Background art Flexible irrigation hoses are known which generally include an inner layer or substrate in direct contact with the liquid to be conveyed, a second layer, or cover, a reinforcement fabric layer interposed therebetween and an outer protective film.
The inner layer is formed of reclaimed polyvinyl chloride, whereas the remaining layers are formed of virgin polyvinyl chloride. Generally, the reclaimed polyvinyl chloride content is lower than 50% based on the total weight of the hose.
A technical prejudice has prevailed heretofore in the industry of flexible hoses, that a flexible hose with a high reclaimed polyvinyl chloride content is of lower quality than a hose wholly composed of virgin polyvinyl chloride.
Disclosure of the invention The object of the present invention is to at least partially overcome the above drawbacks, by providing a flexible hose made of a polymer material with a very low environmental impact.
Another object of the invention is to provide a flexible hose made of a polymer material, that can be manufactured in a simple manner.
Another object of the invention is to provide a flexible hose made of a polymer material, that has a low cost.
Yet another object of the invention is to provide a flexible hose that has a pleasant appearance.
to These and other objects, as better explained hereafter, are fulfilled by a flexible irrigation hose as defined in claim 1, which comprises at least one inner layer formed of a first polymer material comprising reclaimed polyvinyl chloride and an outer protective film formed of a second polymer material compatible with said first polymer material.
The reclaimed polyvinyl chloride may represent in the hose at least 70% based on the total weight of the hose.
Preferably, the reclaimed polyvinyl chloride may represent in the hose at least 80%
based on the total weight of the hose, more preferably at least 90% and most preferably at least 95%.
The use of a high reclaimed polyvinyl chloride content in the hose minimizes the environmental impact of the latter and also helps to reduce hose manufacturing Costs.
On the other hand, the invention relates to a method of making a hose as defined in claim 9, which comprises the steps of providing a firs polymer material comprising a reclaimed polyvinyl chloride-based matrix; providing a second polymer material; extruding the first polymer material to form a first tubular supporting layer and extruding the second polymer material on the first supporting layer to form an outer protective film.
The reclaimed polyvinyl chloride may represent in the hose at least 70% based on the total weight of the hose.
Preferably, the reclaimed polyvinyl chloride may represent in the hose at least 80%
based on the total weight of the hose, more preferably at least 90% and most preferably at least 95%.
Using a high reclaimed polyvinyl chloride content, the method of the invention allows the flexible hose to be manufactured in a simple and cost-effective manner.
Advantageously, the matrix of the polymer material of the inner layer may be a reclaimed PVC-based matrix, whereas the matrix of the outer film may be based on virgin PVC.
Thus, while the flexible hose maintains the environmental impact and costs to a minimum, it will still have a pleasant appearance.
Reclaimed polyvinyl chloride has an uneven exterior aspect in itself, which makes it unattractive for a user that requires a high exterior quality. A virgin PVC
film outside the hole imparts a pleasant appearance thereto.
This will provide a hose with a minimized environmental impact and the exterior appearance of a virgin PVC hose.
Advantageous embodiments of the invention are defined in accordance with the dependent claims.
Another object of the invention is to provide a flexible hose made of a polymer material, that has a low cost.
Yet another object of the invention is to provide a flexible hose that has a pleasant appearance.
to These and other objects, as better explained hereafter, are fulfilled by a flexible irrigation hose as defined in claim 1, which comprises at least one inner layer formed of a first polymer material comprising reclaimed polyvinyl chloride and an outer protective film formed of a second polymer material compatible with said first polymer material.
The reclaimed polyvinyl chloride may represent in the hose at least 70% based on the total weight of the hose.
Preferably, the reclaimed polyvinyl chloride may represent in the hose at least 80%
based on the total weight of the hose, more preferably at least 90% and most preferably at least 95%.
The use of a high reclaimed polyvinyl chloride content in the hose minimizes the environmental impact of the latter and also helps to reduce hose manufacturing Costs.
On the other hand, the invention relates to a method of making a hose as defined in claim 9, which comprises the steps of providing a firs polymer material comprising a reclaimed polyvinyl chloride-based matrix; providing a second polymer material; extruding the first polymer material to form a first tubular supporting layer and extruding the second polymer material on the first supporting layer to form an outer protective film.
The reclaimed polyvinyl chloride may represent in the hose at least 70% based on the total weight of the hose.
Preferably, the reclaimed polyvinyl chloride may represent in the hose at least 80%
based on the total weight of the hose, more preferably at least 90% and most preferably at least 95%.
Using a high reclaimed polyvinyl chloride content, the method of the invention allows the flexible hose to be manufactured in a simple and cost-effective manner.
Advantageously, the matrix of the polymer material of the inner layer may be a reclaimed PVC-based matrix, whereas the matrix of the outer film may be based on virgin PVC.
Thus, while the flexible hose maintains the environmental impact and costs to a minimum, it will still have a pleasant appearance.
Reclaimed polyvinyl chloride has an uneven exterior aspect in itself, which makes it unattractive for a user that requires a high exterior quality. A virgin PVC
film outside the hole imparts a pleasant appearance thereto.
This will provide a hose with a minimized environmental impact and the exterior appearance of a virgin PVC hose.
Advantageous embodiments of the invention are defined in accordance with the dependent claims.
Brief description of the drawings.
Further features and advantages of the invention will become more apparent from the detailed description of a few preferred, non exclusive embodiments of a hose of the invention, which are described as non limiting examples with the help with the accompanying drawings in which:
FIG. 1 is a cross sectional view of a first embodiment of the hose of the invention;
FIG. 2 is a cross sectional view of a second embodiment of the hose of the invention;
FIG. 3 is a cross sectional view of a third embodiment of the hose of the invention.
Detailed description of a preferred embodiment Referring to the above figures, the hose of the invention, generally designated by numeral 1, is particularly useful in conveying liquids from a source point to a point of use, and is for instance an irrigation hose or a garden hose.
In its most general form, the flexible hose 1 may comprise at least one first inner layer 2, which may be made of a polymer material wholly composed of or having a matrix based on reclaimed polyvinyl chloride, and an outer protective film 3, made of a polymer material compatible with the polymer material that forms the inner layer 2.
Advantageously, the film may be as thin as 0.5 mm or less.
As used herein, the term "compatible materials" or derivatives thereof shall be intended to indicate materials having a chemical and/or physical compatibility with 3o each other, i.e. materials that, while in joined relationship, provide a junction adapted to support the transfer of tensile and/or shear stresses through the contact surface. The highest compatibility is thus achieved between identical materials or having the same matrix base.
Further features and advantages of the invention will become more apparent from the detailed description of a few preferred, non exclusive embodiments of a hose of the invention, which are described as non limiting examples with the help with the accompanying drawings in which:
FIG. 1 is a cross sectional view of a first embodiment of the hose of the invention;
FIG. 2 is a cross sectional view of a second embodiment of the hose of the invention;
FIG. 3 is a cross sectional view of a third embodiment of the hose of the invention.
Detailed description of a preferred embodiment Referring to the above figures, the hose of the invention, generally designated by numeral 1, is particularly useful in conveying liquids from a source point to a point of use, and is for instance an irrigation hose or a garden hose.
In its most general form, the flexible hose 1 may comprise at least one first inner layer 2, which may be made of a polymer material wholly composed of or having a matrix based on reclaimed polyvinyl chloride, and an outer protective film 3, made of a polymer material compatible with the polymer material that forms the inner layer 2.
Advantageously, the film may be as thin as 0.5 mm or less.
As used herein, the term "compatible materials" or derivatives thereof shall be intended to indicate materials having a chemical and/or physical compatibility with 3o each other, i.e. materials that, while in joined relationship, provide a junction adapted to support the transfer of tensile and/or shear stresses through the contact surface. The highest compatibility is thus achieved between identical materials or having the same matrix base.
5 As used herein, the term "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.
As used herein, the term "-based matrix" or derivatives thereof, preceded by the 1o 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.
For instance, the film may comprise a polyurethane-based matrix, polyurethane being known to be compatible with polyvinyl chloride.
Conveniently, the polymer material that forms the inner layer and the polymer material that forms the film may both comprise a polyvinyl chloride (PVC)-based matrix, for maximum compatibility.
Advantageously, the matrix of the polymer material of the inner layer may be a reclaimed PVC-based matrix, whereas the matrix of the outer film may be based on virgin PVC.
As used herein, the term "reclaimed polyvinyl chloride" or derivatives thereof shall be intended to designate polyvinyl chloride in any form, deriving from processes of regeneration or recycling of existing PVC products, comprising either virgin PVC or PVC that has been reclaimed once or multiple times.
For instance a PVC product regeneration process may include grinding of the product, possibly filtering or purification to separate the PVC from any residues and granulation of the PVC obtained from the ground product.
As used herein, the term "virgin polyvinyl chloride" or derivatives thereof shall be intended to designate polyvinyl chloride in any form, not deriving from processes of regeneration or recycling of existing PVC products.
As a rule, both the first and the second materials may comprise any amount of compounds other than those that form their matrix. For instance, the first polymer material may include a reclaimed polyvinyl chloride-based matrix mixed with a predetermined amount of virgin polyvinyl chloride.
In a preferred, non limiting embodiment, the first polymer material that forms the inner layer 2 may include reclaimed polyvinyl chloride only, whereas the second polymer material that forms the film 3 may include virgin polyvinyl chloride only. In other words, in such preferred, non limiting embodiment, the first polymer material that forms the inner layer 2 may be free of any virgin polyvinyl chloride, whereas the second polymer material that forms the film 3 may be free of any reclaimed polyvinyl chloride.
Conveniently, the reclaimed polyvinyl chloride may represent in the hose 70%
or more based on the total weight of the hose.
In a particularly preferred embodimend, the reclaimed polyvinyl chloride may represent in the hose at least 80% based on the total weight of the hose, more preferably at least 90% and most preferably at least 95%.
Any number of layers or films may be provided in addition to the inner layer 2 and the film 3, made of any polymer material and situated in any position, without departure from the scope as defined in the annexed claims.
As used herein, the term "-based matrix" or derivatives thereof, preceded by the 1o 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.
For instance, the film may comprise a polyurethane-based matrix, polyurethane being known to be compatible with polyvinyl chloride.
Conveniently, the polymer material that forms the inner layer and the polymer material that forms the film may both comprise a polyvinyl chloride (PVC)-based matrix, for maximum compatibility.
Advantageously, the matrix of the polymer material of the inner layer may be a reclaimed PVC-based matrix, whereas the matrix of the outer film may be based on virgin PVC.
As used herein, the term "reclaimed polyvinyl chloride" or derivatives thereof shall be intended to designate polyvinyl chloride in any form, deriving from processes of regeneration or recycling of existing PVC products, comprising either virgin PVC or PVC that has been reclaimed once or multiple times.
For instance a PVC product regeneration process may include grinding of the product, possibly filtering or purification to separate the PVC from any residues and granulation of the PVC obtained from the ground product.
As used herein, the term "virgin polyvinyl chloride" or derivatives thereof shall be intended to designate polyvinyl chloride in any form, not deriving from processes of regeneration or recycling of existing PVC products.
As a rule, both the first and the second materials may comprise any amount of compounds other than those that form their matrix. For instance, the first polymer material may include a reclaimed polyvinyl chloride-based matrix mixed with a predetermined amount of virgin polyvinyl chloride.
In a preferred, non limiting embodiment, the first polymer material that forms the inner layer 2 may include reclaimed polyvinyl chloride only, whereas the second polymer material that forms the film 3 may include virgin polyvinyl chloride only. In other words, in such preferred, non limiting embodiment, the first polymer material that forms the inner layer 2 may be free of any virgin polyvinyl chloride, whereas the second polymer material that forms the film 3 may be free of any reclaimed polyvinyl chloride.
Conveniently, the reclaimed polyvinyl chloride may represent in the hose 70%
or more based on the total weight of the hose.
In a particularly preferred embodimend, the reclaimed polyvinyl chloride may represent in the hose at least 80% based on the total weight of the hose, more preferably at least 90% and most preferably at least 95%.
Any number of layers or films may be provided in addition to the inner layer 2 and the film 3, made of any polymer material and situated in any position, without departure from the scope as defined in the annexed claims.
Particularly, the hose 1 may include one or more reinforcement fabric layers 4 of any type. Particularly, it may be of braided or knitted type.
As used herein, the term "fabric layer" and the like will be intended to indicate a layer composed of at least two yarns or sets of yarns arranged over a substrate.
As used herein, the term "fabric layer of braided type" and the like shall be intended to indicate a layer composed of at least two yarns or sets of yarns spiral wound onto the substrate with opposite inclinations, superposed but not interwoven.
As used herein, the term "fabric layer of knitted type" and the like will be intended to indicate a layer composed of at least two yarns or sets of yarns arranged over the substrate and interwoven to form a plurality of chain stitches of the tricot type.
In a first preferred, non limiting embodiment, as shown in FIG. 1, the hose 1 may be solely formed of the inner layer 2, which will be in direct contact with the liquid to be conveyed, such as water, and the outer film 3.
In a second preferred, non limiting embodiment, as shown in FIG. 2, the hose 1 may include, as viewed from the outside, the protective film 3, the first inner layer 2, a reinforcement fabric layer 4 and a second inner layer 5 in direct contact with the liquid to be conveyed.
The fabric reinforcement layers may be both of braided type, both of knitted type or, preferably include a knitted layer and a braided layer.
The second inner layer 5 may be formed of a third polymer material, also comprising a reclaimed polyvinyl chloride-based matrix.
As used herein, the term "fabric layer" and the like will be intended to indicate a layer composed of at least two yarns or sets of yarns arranged over a substrate.
As used herein, the term "fabric layer of braided type" and the like shall be intended to indicate a layer composed of at least two yarns or sets of yarns spiral wound onto the substrate with opposite inclinations, superposed but not interwoven.
As used herein, the term "fabric layer of knitted type" and the like will be intended to indicate a layer composed of at least two yarns or sets of yarns arranged over the substrate and interwoven to form a plurality of chain stitches of the tricot type.
In a first preferred, non limiting embodiment, as shown in FIG. 1, the hose 1 may be solely formed of the inner layer 2, which will be in direct contact with the liquid to be conveyed, such as water, and the outer film 3.
In a second preferred, non limiting embodiment, as shown in FIG. 2, the hose 1 may include, as viewed from the outside, the protective film 3, the first inner layer 2, a reinforcement fabric layer 4 and a second inner layer 5 in direct contact with the liquid to be conveyed.
The fabric reinforcement layers may be both of braided type, both of knitted type or, preferably include a knitted layer and a braided layer.
The second inner layer 5 may be formed of a third polymer material, also comprising a reclaimed polyvinyl chloride-based matrix.
The third polymer material that forms the second layer 5 may comprise any amount of compounds other than those that its matrix. For instance, the third polymer material may include a reclaimed polyvinyl chloride-based matrix mixed with a predetermined amount of virgin polyvinyl chloride.
In a preferred, non limiting embodiment, the third polymer material may include reclaimed polyvinyl chloride only. In other words, in this embodiment, the third polymer material may be free of any virgin polyvinyl chloride.
1o Also in this second embodiment, the reclaimed polyvinyl chloride may represent in the hose 70% or more based on the total weight of the hose, preferably at least 80%, more preferably at least 90% and most preferably at least 95%.
Advantageously, the first polymer material that forms the first inner layer 2 may include 10% to 50% reclaimed polyvinyl chloride by weight based on the total weight of the hose, preferably 30%.
Conveniently, the third polymer material that forms the second inner layer 5 may include 40% to 80% reclaimed polyvinyl chloride by weight based on the total weight of the hose, preferably 60%.
Suitably, the third polymer material that forms the second inner layer 5 may have a higher Shore A hardness than the first polymer material that forms the first inner layer 2.
For instance, the third polymer material may have a Shore A hardness of 95 to 30, preferably about 75, and the first polymer material may have a Shore A
hardness of 95 to 30, preferably about 65.
In a third embodiment, as shown in FIG. 3, the hose 1 may have the same features as the hose of FIG. 2, with the addition of an inner film 6 formed of a fourth polymer material, compatible both with the third polymer material that forms the second inner layer 5 and with the first polymer material that forms the first inner layer 2.
With this configuration, the hose of the invention will have superior mechanical features, positively similar to those of a hose wholly made of virgin PVC.
The inner film 6 will act as a "bridge" between the first inner layer 2 and the second inner layer 5, both having a reclaimed polyvinyl chloride-based matrix, for firm 1o adhesion between such layers.
Conveniently, the fourth polymer material that forms such inner film 6 may include a virgin PVC-based matrix.
The hose 1 may be fabricated using a method that includes the following steps.
The first step will be the provision of the first polymer material, the second polymer material and the third polymer material and/or the fourth polymer material, if any.
2o As used herein, the term "provision" or derivatives thereof, shall be intended to designate the preparation of a relevant component for a relevant process step, including any preventive treatment designed for optimal performance of such relevant step, from simple collection and possible storage to washing, purification, filtering or the like.
For instance, the step of providing one or more polymer materials having a reclaimed PVC-based matrix may include the step of regenerating existing PVC
products, such as flexible hoses, medical tubes or telephone cards.
On the other hand, the step of providing one or more polymer materials having a reclaimed PVC-based matrix may include simple collection of such materials from a storage site, once they have undergone a PVC regeneration treatment.
The following steps may include extrusion of the first polymer material to form the 5 first tubular layer 2 and extrusion of the second polymer material to form the outer protective film 3.
Depending on the number of layers of the hose 1 to be formed, as many steps will be provided for extruding them. Also, if one or more reinforcement layers 4 are 10 provided, the latter will have to be formed by processes known per se to those of ordinary skill in the art.
For instance, in the case of the hose 1 of FIG. 1, the second polymer material shall be simply extruded on the layer 2 formed of the first polymer material, that will also act as a supporting layer.
Conversely, in the case of the hose 1 of FIG. 2, the third polymer material will first have to be extruded to form the second inner layer 5, that will act as a supporting layer, and then the reinforcement fabric layer 4 will be formed thereon, e.g.
by braiding or knitting, then the first material will be extruded on the semifinished assembly of the first two layers to form the first inner layer 2 and the second material will be extruded thereon to form the film 3.
In the case of the hose 1 of FIG. 3, the same procedure as above will be carried out, by extrusion of the fourth material on the second inner layer 5 that will act as a supporting layer to form the film 6 and then by forming the layers 4, 2 and 3 thereon, as described above.
The above disclosure clearly shows that the invention fulfils the intended objects, and particularly meets the requirement of providing a hose having an exterior appearance and/or mechanical features similar to those of a hose wholly formed of virgin PVC, while having minimized environmental impact and manufacturing costs.
The hose of this 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.
to While the hose 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.
In a preferred, non limiting embodiment, the third polymer material may include reclaimed polyvinyl chloride only. In other words, in this embodiment, the third polymer material may be free of any virgin polyvinyl chloride.
1o Also in this second embodiment, the reclaimed polyvinyl chloride may represent in the hose 70% or more based on the total weight of the hose, preferably at least 80%, more preferably at least 90% and most preferably at least 95%.
Advantageously, the first polymer material that forms the first inner layer 2 may include 10% to 50% reclaimed polyvinyl chloride by weight based on the total weight of the hose, preferably 30%.
Conveniently, the third polymer material that forms the second inner layer 5 may include 40% to 80% reclaimed polyvinyl chloride by weight based on the total weight of the hose, preferably 60%.
Suitably, the third polymer material that forms the second inner layer 5 may have a higher Shore A hardness than the first polymer material that forms the first inner layer 2.
For instance, the third polymer material may have a Shore A hardness of 95 to 30, preferably about 75, and the first polymer material may have a Shore A
hardness of 95 to 30, preferably about 65.
In a third embodiment, as shown in FIG. 3, the hose 1 may have the same features as the hose of FIG. 2, with the addition of an inner film 6 formed of a fourth polymer material, compatible both with the third polymer material that forms the second inner layer 5 and with the first polymer material that forms the first inner layer 2.
With this configuration, the hose of the invention will have superior mechanical features, positively similar to those of a hose wholly made of virgin PVC.
The inner film 6 will act as a "bridge" between the first inner layer 2 and the second inner layer 5, both having a reclaimed polyvinyl chloride-based matrix, for firm 1o adhesion between such layers.
Conveniently, the fourth polymer material that forms such inner film 6 may include a virgin PVC-based matrix.
The hose 1 may be fabricated using a method that includes the following steps.
The first step will be the provision of the first polymer material, the second polymer material and the third polymer material and/or the fourth polymer material, if any.
2o As used herein, the term "provision" or derivatives thereof, shall be intended to designate the preparation of a relevant component for a relevant process step, including any preventive treatment designed for optimal performance of such relevant step, from simple collection and possible storage to washing, purification, filtering or the like.
For instance, the step of providing one or more polymer materials having a reclaimed PVC-based matrix may include the step of regenerating existing PVC
products, such as flexible hoses, medical tubes or telephone cards.
On the other hand, the step of providing one or more polymer materials having a reclaimed PVC-based matrix may include simple collection of such materials from a storage site, once they have undergone a PVC regeneration treatment.
The following steps may include extrusion of the first polymer material to form the 5 first tubular layer 2 and extrusion of the second polymer material to form the outer protective film 3.
Depending on the number of layers of the hose 1 to be formed, as many steps will be provided for extruding them. Also, if one or more reinforcement layers 4 are 10 provided, the latter will have to be formed by processes known per se to those of ordinary skill in the art.
For instance, in the case of the hose 1 of FIG. 1, the second polymer material shall be simply extruded on the layer 2 formed of the first polymer material, that will also act as a supporting layer.
Conversely, in the case of the hose 1 of FIG. 2, the third polymer material will first have to be extruded to form the second inner layer 5, that will act as a supporting layer, and then the reinforcement fabric layer 4 will be formed thereon, e.g.
by braiding or knitting, then the first material will be extruded on the semifinished assembly of the first two layers to form the first inner layer 2 and the second material will be extruded thereon to form the film 3.
In the case of the hose 1 of FIG. 3, the same procedure as above will be carried out, by extrusion of the fourth material on the second inner layer 5 that will act as a supporting layer to form the film 6 and then by forming the layers 4, 2 and 3 thereon, as described above.
The above disclosure clearly shows that the invention fulfils the intended objects, and particularly meets the requirement of providing a hose having an exterior appearance and/or mechanical features similar to those of a hose wholly formed of virgin PVC, while having minimized environmental impact and manufacturing costs.
The hose of this 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.
to While the hose 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 (10)
1. A flexible irrigation hose, comprising at least one first inner shell (2) made of a first polymer material comprising a reclaimed polyvinyl chloride-based matrix and an external protecting film (3) made of a second polymer material which is compatible with said first polymer material, wherein the reclaimed polyvinyl chloride is present in the hose in a weight percentage of at least 70% with respect to the total weight of the hose.
2. Hose according to claim 1, wherein the polyvinyl reclaimed chloride is present in the hose in a weight percentage of at least 80% with respect to the total weight of the hose, preferably at least 90% with respect to the total weight of the hose and still more preferably than at least 95% with respect to the total weight of the hose.
3. Hose according to claim 1 or 2, wherein said second polymer material comprises a virgin polyvinyl chloride-based matrix.
4. Hose according to claim 3, wherein said first polymer material exclusively comprises reclaimed polyvinyl chloride, said second polymer material exclusively comprising virgin polyvinyl chloride.
5. Hose according to one or more of the preceding claims, wherein said film (3) has a thickness equal to or less than 0,5 mm
6. Hose according to one or more of the preceding claims, comprising a second inner layer (5) in direct contact with the liquid to be transport made of a third polymer material comprising a reclaimed polyvinyl chloride-based matrix, at least one textile reinforcing layer (4) interposed between said first inner layer (2) and said second inner layer (5) being provided.
7. Hose according to claim 6, wherein said third polymer material exclusively comprises reclaimed polyvinyl chloride.
8. Hose according to claim 6 or 7, wherein said third polymer material comprises reclaimed polyvinyl chloride in a weight percentage comprised between 40% and 80% with respect to the total weight of the hose, and preferably close to 60%
with respect to the total weight of the hose, and wherein said first polymer material comprises reclaimed polyvinyl chloride in a weight percentage comprised between 10% and 50% with respect to the total weight of the hose, and preferably close to 30% with respect to the total weight of the hose.
with respect to the total weight of the hose, and wherein said first polymer material comprises reclaimed polyvinyl chloride in a weight percentage comprised between 10% and 50% with respect to the total weight of the hose, and preferably close to 30% with respect to the total weight of the hose.
9. Hose according to claim 6, 7 or 8, comprising an inner film (6) made of a fourth polymer material which is compatible with both said third polymer material and said first polymer material, said fourth polymer material preferably comprising a virgin polyvinyl chloride-based matrix.
10. A method for manufacturing a hose according to one or more of the preceding claims, comprising the steps of:
- providing a first polymer material comprising a reclaimed polyvinyl chloride-based matrix;
- providing a second polymer material which is compatible with said first polymer material;
- extruding said first polymer material for manufacturing a first inner tubular layer (2);
- extruding said second polymer material for manufacturing a protecting film (3) externally to said first inner layer (2), wherein the reclaimed polyvinyl chloride is present in the hose in a weight percentage of at least 70% with respect to the total weight of the hose.
- providing a first polymer material comprising a reclaimed polyvinyl chloride-based matrix;
- providing a second polymer material which is compatible with said first polymer material;
- extruding said first polymer material for manufacturing a first inner tubular layer (2);
- extruding said second polymer material for manufacturing a protecting film (3) externally to said first inner layer (2), wherein the reclaimed polyvinyl chloride is present in the hose in a weight percentage of at least 70% with respect to the total weight of the hose.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000248A ITVI20090248A1 (en) | 2009-10-09 | 2009-10-09 | FLEXIBLE PIPE IN REGENERATED PVC, AS WELL AS THE METHOD OF REALIZING THE SAME |
| ITVI2009A000248 | 2009-10-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2699400A1 true CA2699400A1 (en) | 2011-04-09 |
Family
ID=42126080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2699400A Abandoned CA2699400A1 (en) | 2009-10-09 | 2010-04-09 | Flexible hose made of reclaimed pvc and method of making same |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2699400A1 (en) |
| IT (1) | ITVI20090248A1 (en) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5094519A (en) * | 1973-12-13 | 1975-07-28 | ||
| DE3102350A1 (en) * | 1981-01-24 | 1982-08-19 | Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co Kg, 4352 Herten | Multilayer pipe of thermoplastic |
| KR950005495Y1 (en) * | 1992-10-01 | 1995-07-12 | 신용구 | Double-walled pipe |
| CA2092897A1 (en) * | 1993-03-29 | 1994-09-30 | Jean Mailloux | Triple-wall tubular element |
| ES1036991Y (en) * | 1997-04-16 | 1998-05-01 | Ibotec Lda | PERFECTED FLEXIBLE TUBE FOR WATER CONDUCTION. |
| JPH11257548A (en) * | 1998-03-11 | 1999-09-21 | Sekisui Chem Co Ltd | Silencing property pipe |
| JP2001041362A (en) * | 1999-07-27 | 2001-02-13 | Sekisui Chem Co Ltd | Triple layer pipe |
| FR2803897B1 (en) * | 2000-01-17 | 2002-08-23 | Tricoflex Sa | MULTILAYER PIPING FOR THE TRANSPORT OF HOT FLUIDS |
| CN1333125A (en) * | 2000-07-10 | 2002-01-30 | 张树人 | Hard polyvinyl-chloride drainage pipe with composite wall |
| IT251754Y1 (en) * | 2000-10-16 | 2004-01-20 | Uniflex Utiltime Spa | FLEXIBLE HOSE FOR IRRIGATION |
| ES1053296Y (en) * | 2002-10-17 | 2003-07-16 | Fersil Plastico S L | FLEXIBLE TUBE MANUFACTURED FOR WATER DRIVING. |
| FR2897137A1 (en) * | 2006-02-09 | 2007-08-10 | Hozelock Tricoflex Soc Par Act | Multilayer plastic material hose for e.g. pipe, has tubular frame made of long glass fibers that are placed around inner layer, according to braiding, fiber mat winding or fiber braid winding techniques |
| JP2007283733A (en) * | 2006-04-20 | 2007-11-01 | Sekisui Chem Co Ltd | Vinyl chloride-based foamed resin tube, its manufacturing device, and manufacturing method |
| CN100569504C (en) * | 2007-07-26 | 2009-12-16 | 李子清 | The production method of PVC-U composite nano drainpipe |
-
2009
- 2009-10-09 IT IT000248A patent/ITVI20090248A1/en unknown
-
2010
- 2010-04-09 CA CA2699400A patent/CA2699400A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ITVI20090248A1 (en) | 2011-04-10 |
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