CA2092897A1 - Triple-wall tubular element - Google Patents
Triple-wall tubular elementInfo
- Publication number
- CA2092897A1 CA2092897A1 CA 2092897 CA2092897A CA2092897A1 CA 2092897 A1 CA2092897 A1 CA 2092897A1 CA 2092897 CA2092897 CA 2092897 CA 2092897 A CA2092897 A CA 2092897A CA 2092897 A1 CA2092897 A1 CA 2092897A1
- Authority
- CA
- Canada
- Prior art keywords
- tubular element
- triple
- thermoplastic material
- wall tubular
- wall
- 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
- 239000012815 thermoplastic material Substances 0.000 claims abstract description 35
- 239000004800 polyvinyl chloride Substances 0.000 claims description 11
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004609 Impact Modifier Substances 0.000 claims description 4
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229920005601 base polymer Polymers 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 239000003223 protective agent Substances 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 239000000463 material Substances 0.000 description 10
- 239000002699 waste material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000006750 UV protection Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 101100452676 Arabidopsis thaliana INVB gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- MCOQHIWZJUDQIC-UHFFFAOYSA-N barban Chemical compound ClCC#CCOC(=O)NC1=CC=CC(Cl)=C1 MCOQHIWZJUDQIC-UHFFFAOYSA-N 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000036561 sun exposure Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- 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
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/121—Rigid pipes of plastics with or without reinforcement with three layers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The disclosure herein describes a triple-wall tubular element that comprises a thin outer layer composed of a non-recycled thermoplastic material having a thickness in the neighbourhood of 10% of the wall thickness of the tubular element, a thin inner layer composed of non-recycled thermoplastic material having a thickness in the neighbourhood of 5% of the wall thickness of the tubular element, and a thick intermediate layer sandwiched between the inner and the outer layers, the intermediate layer being composed of recycled thermoplastic material.
The disclosure herein describes a triple-wall tubular element that comprises a thin outer layer composed of a non-recycled thermoplastic material having a thickness in the neighbourhood of 10% of the wall thickness of the tubular element, a thin inner layer composed of non-recycled thermoplastic material having a thickness in the neighbourhood of 5% of the wall thickness of the tubular element, and a thick intermediate layer sandwiched between the inner and the outer layers, the intermediate layer being composed of recycled thermoplastic material.
Description
2092~97 ., -- 1 --~ LD O~ INVB~TION
;? The present invention relates to a triple-wall tubular element made of thermoplastic material utilizing mainly recycled plastic materials. More particularly, the invention pertains to the use of thermoplastic ~J recycled material for the making of tubular elements, such as tubes and pipes, while retaining the physical properties required for such products.
;-J BACRGROUND OF ~ INV~N~ION
The use of recycled plastic material for the making of tubes and pipes is well known. Also well known is the knowledge that with the use of recycled waste material, there results an alteration of the mechanical properties of the products either due to contamination of the waste material or to a successive degradation of the products being used.
There exists various methods for making triple-wall tubular elements, such as described in U.S. patent No. 4,731,002 issued March 15, 1988 to Spence et al., wherein the intermediate layer is composed of foam plastic. However, it has been noted that this method as well as other proc~sses contribute to decrease the properties of the pipes thus made, mainly with respect to impact resistance.
~ ' ~
: :;
;~
- 2092~7 ~ 2 -Hence, it is necessary to provide an element of the type described wherein recycled plastic material is used without altering the properties of the product made.
OBJECq! AND 8TATBME:}~T OF ~ DIYEN~!IO~
It is therefore an object of the present invention to provide a triple--wall tubular element which overcomes the above-described problems and wherein a major part of the finished product is composed of recycled plastic materialO
The invention therefore relates to a triple-wall tubular element which comprises:
- a thin outer layer composed of non-recycled thermoplastic material, the outer layer having a thickness in the neighborhood of 10% of the wall tAickness of the tubular element;
- a thin inner layer composed of non-recycled thermoplastic material, the inner layer having a thickness in the neighborhood of 5% of the wall thickness of the tubular element; and - a thick intermediate layer sandwiched between the inner and outer layers, the intermediate layer being composed of recycled thermoplastic material.
~:
' '~ 5j 20928~7 ...;
q In one preferred form of the invention, khe outer layer includes ultraviolet protection means as well as impact modifier means.
,,~
In another preferred form of the invention, the thermoplastic material of the intermediate layer is similar to or compatible with the thermoplastic material ~,1 of the inner and outer layers of the tubular element.
i~
.,,,.~
~ Other objects and further scope of .~.,,j applicability of the present invention will become apparent from the detailed description given hereinafter.
It should be understood, however, that this detailed description, while indicating preferred embodiments of the invention, is given by way of illustration only, since various changes and modifier within the spirit and scope of the invention will become apparent to those skilled in the art.
,., B~IE~ DEæC~IPTION O~ T~E DRaWINGS
- Figure 1 is a perspective view of a tripl~-wall tubular element made in accordance with the present invention; and Figure 2 is a cross-sectional view of the wall of the tubular element taken along line 2-2 of figure 1.
:.
r~
i..'',5 s ~ 2092~97 DE~CRIPTION OF PREFERRBD E~BODIMEN~
Referring to figures 1 and 2, the tubular element or pipe 10 consists of a body formed of three layers 12, 14 and 16.
~i ~l 5The outer layer 12 is composed of a non-recycled thermoplastic material which includes protective agents against ultraviolet rays and impact modifiers.
: ~:
The intermediate layer 14 is composed of recycled thermoplastic material which has been obtained 10from plastic material pulverized in powder form to provide homogeneity to the product.
The inner layer 16 is composed of non-recycled thermoplastic material.
: :
It has been found that it is possible to make 15a pipe or tube of thermoplastic material containing at least 80% of recycled plastic material without altering the physical mechanical properties of the product. This has been achieved by applying on both faces of the recycled thermoplastic material an inner layer and an 20outer layer of non-recycled material.
: ~' '';'' The outer layer must include a matrix with ultraviolet protection, such as titanium dioxide or carbon black, in order to protect this thin outer layer : ~
-- 2092~97 ..
from sun exposure. The outer layer 12 should also ~ ;;. .
contain impact modfiers of the acrylic type or of the chlorinat~d polyethylene type in order to avoid the breaking of this thin outer layer when subjected to impact. It has been determined that the outer layer should preferably constitute about 10% of the total thickness of the tubular element. This thickness enables an adequate protection to ultraviolet rays while permitting also to maintain the needed rigidity for the tube or pipe.
The intermediate layer 14 must be constituted of thermoplastic material which has been prior pulverized at 20 mesh so as to be in powder form thus enabling adequate homogeneity of the mixture and ensuring sufficient compactness during the extrusion process of the tubular element. Preferably, this extrusion must be accomplished with a thermoplastic material which is chemically similar to or at least compatible with the thermoplastic material of the inner and outer layers in order to provide an intimate connection with these layers. It has been found that polyvinyl chloride obtained from vinyl sidings, from window frames, from PVC
bottles, from plastic credit cards, from blister packs and from vertical blinds provide satisfactory results.
Also, it has been noted that wastes originating from acrylonitrite butadiene styrene, styrene-base polymers, ,;,:
21D92~97 acrylic base polymers and certain polyolefins provide satisfactory results.
A further importance of the present invention ,,~t~
is that the inner layer, which must constitute a thickness in the neighbourhood of 5% of the tokal thickness of the tubular element, should be made of a polymer, preferably identical to that of the outer layer.
The inner layer 16 enables to maintain intact the flowing properties of the pipe or tubular element and, also, to retain the impact resistance of the entire assembly.
In order to make this multi-layer tubular ~; element, it is necessary to utilize an apparatus having two or three extruders. It is also necessary to use a ~:
temperature differential of at least 30F between the internal temperature, the external temperature and the temperature of the central part. This differential enables the non-recycled thermoplastic material to join adequately with the recycled thermoplastic material and to make up for its defects.
Xa~PLE -;~
A resin of polyvinyl chloride having a K value of 60-70 (in the present case 66 of Esso chemical) to which was added 2 phr of impact modifier of the chlorinated polyethylene type, such as CPE 3615 sold by Dow Chemicals, was added to 1 phr of titanium oxide, .~
~I - 7 -j4~
Titanox RCR-40O A mixture of lubricant composed of parafin wax, calcium stearate and polyethylene wax wa5 "i also used. This matrix served for ~orming the inner and , outer layers. Waste from vinyl sidings, window frames ,j 5 and plastic credit cards were pulverized at 20 mesh and mixed together. This mixture was extrudea3 by means of a ~' conventional extruder, Krauss Maf~ei KMD 90 twin screw.
The non-recycled material was extruded by means of a twin screw extruder American Maplan DSK 52.
A conventional coextruder block equipped with two flow control valves ~or the inner and outer layers was used, to which was fixed an extruder head for the tubular elements. This assembly was used to produce pipes of 4" (100 mm) DR~35 and of 6" (150 mm) such as described in the standard ASTM D-3034. Also produced were pipes having a thickness DR 28 in accordance with the standard NQ 3624-130. The melt temperature was maintained at 400F for the non-recycled material and between 365F and 370F for the recycled material.
The produced tubular element was cooled, cut and belled such as is conventionally done with standard 3 equipment. The results of crushing tests and rigidity tests were comparable to the results obtained with conventional pipes. The impact resistance at room temperature has indicated an increased resistance compared to a conventional extruded pipe. At 0C, the 1;, ~:~
:`~
;~ ` 2092~7 results were satisfactory with respect to standard ~L',: re~uirements, such as 95 joules for the 100 mm and 150 joules for the 150 mm. In these tests, a delamination oP
the layers was not observed.
Although the invention has been described above with respect with one specific form, it will be evident to a person skilled in the art that it may be modified and refined in various ways. It is therefore wished to have it understood that the present invention should not be limited in scope, except by the terms of the ~ollowing claims.
'" '' ~'.
"
;? The present invention relates to a triple-wall tubular element made of thermoplastic material utilizing mainly recycled plastic materials. More particularly, the invention pertains to the use of thermoplastic ~J recycled material for the making of tubular elements, such as tubes and pipes, while retaining the physical properties required for such products.
;-J BACRGROUND OF ~ INV~N~ION
The use of recycled plastic material for the making of tubes and pipes is well known. Also well known is the knowledge that with the use of recycled waste material, there results an alteration of the mechanical properties of the products either due to contamination of the waste material or to a successive degradation of the products being used.
There exists various methods for making triple-wall tubular elements, such as described in U.S. patent No. 4,731,002 issued March 15, 1988 to Spence et al., wherein the intermediate layer is composed of foam plastic. However, it has been noted that this method as well as other proc~sses contribute to decrease the properties of the pipes thus made, mainly with respect to impact resistance.
~ ' ~
: :;
;~
- 2092~7 ~ 2 -Hence, it is necessary to provide an element of the type described wherein recycled plastic material is used without altering the properties of the product made.
OBJECq! AND 8TATBME:}~T OF ~ DIYEN~!IO~
It is therefore an object of the present invention to provide a triple--wall tubular element which overcomes the above-described problems and wherein a major part of the finished product is composed of recycled plastic materialO
The invention therefore relates to a triple-wall tubular element which comprises:
- a thin outer layer composed of non-recycled thermoplastic material, the outer layer having a thickness in the neighborhood of 10% of the wall tAickness of the tubular element;
- a thin inner layer composed of non-recycled thermoplastic material, the inner layer having a thickness in the neighborhood of 5% of the wall thickness of the tubular element; and - a thick intermediate layer sandwiched between the inner and outer layers, the intermediate layer being composed of recycled thermoplastic material.
~:
' '~ 5j 20928~7 ...;
q In one preferred form of the invention, khe outer layer includes ultraviolet protection means as well as impact modifier means.
,,~
In another preferred form of the invention, the thermoplastic material of the intermediate layer is similar to or compatible with the thermoplastic material ~,1 of the inner and outer layers of the tubular element.
i~
.,,,.~
~ Other objects and further scope of .~.,,j applicability of the present invention will become apparent from the detailed description given hereinafter.
It should be understood, however, that this detailed description, while indicating preferred embodiments of the invention, is given by way of illustration only, since various changes and modifier within the spirit and scope of the invention will become apparent to those skilled in the art.
,., B~IE~ DEæC~IPTION O~ T~E DRaWINGS
- Figure 1 is a perspective view of a tripl~-wall tubular element made in accordance with the present invention; and Figure 2 is a cross-sectional view of the wall of the tubular element taken along line 2-2 of figure 1.
:.
r~
i..'',5 s ~ 2092~97 DE~CRIPTION OF PREFERRBD E~BODIMEN~
Referring to figures 1 and 2, the tubular element or pipe 10 consists of a body formed of three layers 12, 14 and 16.
~i ~l 5The outer layer 12 is composed of a non-recycled thermoplastic material which includes protective agents against ultraviolet rays and impact modifiers.
: ~:
The intermediate layer 14 is composed of recycled thermoplastic material which has been obtained 10from plastic material pulverized in powder form to provide homogeneity to the product.
The inner layer 16 is composed of non-recycled thermoplastic material.
: :
It has been found that it is possible to make 15a pipe or tube of thermoplastic material containing at least 80% of recycled plastic material without altering the physical mechanical properties of the product. This has been achieved by applying on both faces of the recycled thermoplastic material an inner layer and an 20outer layer of non-recycled material.
: ~' '';'' The outer layer must include a matrix with ultraviolet protection, such as titanium dioxide or carbon black, in order to protect this thin outer layer : ~
-- 2092~97 ..
from sun exposure. The outer layer 12 should also ~ ;;. .
contain impact modfiers of the acrylic type or of the chlorinat~d polyethylene type in order to avoid the breaking of this thin outer layer when subjected to impact. It has been determined that the outer layer should preferably constitute about 10% of the total thickness of the tubular element. This thickness enables an adequate protection to ultraviolet rays while permitting also to maintain the needed rigidity for the tube or pipe.
The intermediate layer 14 must be constituted of thermoplastic material which has been prior pulverized at 20 mesh so as to be in powder form thus enabling adequate homogeneity of the mixture and ensuring sufficient compactness during the extrusion process of the tubular element. Preferably, this extrusion must be accomplished with a thermoplastic material which is chemically similar to or at least compatible with the thermoplastic material of the inner and outer layers in order to provide an intimate connection with these layers. It has been found that polyvinyl chloride obtained from vinyl sidings, from window frames, from PVC
bottles, from plastic credit cards, from blister packs and from vertical blinds provide satisfactory results.
Also, it has been noted that wastes originating from acrylonitrite butadiene styrene, styrene-base polymers, ,;,:
21D92~97 acrylic base polymers and certain polyolefins provide satisfactory results.
A further importance of the present invention ,,~t~
is that the inner layer, which must constitute a thickness in the neighbourhood of 5% of the tokal thickness of the tubular element, should be made of a polymer, preferably identical to that of the outer layer.
The inner layer 16 enables to maintain intact the flowing properties of the pipe or tubular element and, also, to retain the impact resistance of the entire assembly.
In order to make this multi-layer tubular ~; element, it is necessary to utilize an apparatus having two or three extruders. It is also necessary to use a ~:
temperature differential of at least 30F between the internal temperature, the external temperature and the temperature of the central part. This differential enables the non-recycled thermoplastic material to join adequately with the recycled thermoplastic material and to make up for its defects.
Xa~PLE -;~
A resin of polyvinyl chloride having a K value of 60-70 (in the present case 66 of Esso chemical) to which was added 2 phr of impact modifier of the chlorinated polyethylene type, such as CPE 3615 sold by Dow Chemicals, was added to 1 phr of titanium oxide, .~
~I - 7 -j4~
Titanox RCR-40O A mixture of lubricant composed of parafin wax, calcium stearate and polyethylene wax wa5 "i also used. This matrix served for ~orming the inner and , outer layers. Waste from vinyl sidings, window frames ,j 5 and plastic credit cards were pulverized at 20 mesh and mixed together. This mixture was extrudea3 by means of a ~' conventional extruder, Krauss Maf~ei KMD 90 twin screw.
The non-recycled material was extruded by means of a twin screw extruder American Maplan DSK 52.
A conventional coextruder block equipped with two flow control valves ~or the inner and outer layers was used, to which was fixed an extruder head for the tubular elements. This assembly was used to produce pipes of 4" (100 mm) DR~35 and of 6" (150 mm) such as described in the standard ASTM D-3034. Also produced were pipes having a thickness DR 28 in accordance with the standard NQ 3624-130. The melt temperature was maintained at 400F for the non-recycled material and between 365F and 370F for the recycled material.
The produced tubular element was cooled, cut and belled such as is conventionally done with standard 3 equipment. The results of crushing tests and rigidity tests were comparable to the results obtained with conventional pipes. The impact resistance at room temperature has indicated an increased resistance compared to a conventional extruded pipe. At 0C, the 1;, ~:~
:`~
;~ ` 2092~7 results were satisfactory with respect to standard ~L',: re~uirements, such as 95 joules for the 100 mm and 150 joules for the 150 mm. In these tests, a delamination oP
the layers was not observed.
Although the invention has been described above with respect with one specific form, it will be evident to a person skilled in the art that it may be modified and refined in various ways. It is therefore wished to have it understood that the present invention should not be limited in scope, except by the terms of the ~ollowing claims.
'" '' ~'.
"
Claims (19)
1. A triple-wall tubular element comprising:
- a thin outer layer composed of non-recycled thermoplastic material, said outer layer having a thickness in the neighborhood of 10% of the wall thickness of the tubular element;
- a thin inner layer composed of non-recycled thermoplastic material, said inner layer having a thickness in the neighborhood of 5% of the wall thickness of the tubular element; and - a thick intermediate layer sandwiched between said inner and outer layers, said intermediate layer being composed of recycled thermoplastic material.
- a thin outer layer composed of non-recycled thermoplastic material, said outer layer having a thickness in the neighborhood of 10% of the wall thickness of the tubular element;
- a thin inner layer composed of non-recycled thermoplastic material, said inner layer having a thickness in the neighborhood of 5% of the wall thickness of the tubular element; and - a thick intermediate layer sandwiched between said inner and outer layers, said intermediate layer being composed of recycled thermoplastic material.
2. A triple-wall tubular element as defined in claim 1, wherein said intermediate layer represents about 80% of the wall thickness of the tubular element.
3. A triple-wall tubular element as defined in claim 1, wherein said outer layer includes ultraviolet and protective agent.
4. A triple-wall tubular element as defined in claim 3, wherein said agent is titanium dioxide.
5. A triple-wall tubular element as defined in claim 3, wherein said agent is carbon black.
6. A triple-wall tubular element as defined in claim 1, wherein said outer layer includes an impact modifier.
7. A triple-wall tubular element as defined in claim 6, wherein said modifier consists of chlorinated polyethylene.
8. A triple-wall tubular element as defined in claim 6, wherein said modifier is an acrylic base polymer.
9. A triple-wall tubular element as defined in claim 2, wherein said thermoplastic material of said intermediate layer is made from a fine powder pulverized at about 20 mesh.
10. A triple wall tubular element as defined in claim 9, wherein said thermoplastic material of said intermediate layer is similar to or compatible with the thermoplastic material of said inner and said outer layers.
11. A triple-wall tubular element as defined in claim 9, wherein said thermoplastic material is polyvinyl chloride.
12. A triple-wall tubular element as defined in claim 11, wherein said polyvinyl chloride is a recycled thermoplastic material obtained from vinyl sidings.
13. A triple-wall tubular element as defined in claim 11, wherein said polyvinyl chloride is a recycled thermoplastic material obtained from window frames.
14. A triple-wall tubular element as defined in claim 11, wherein said polyvinyl chloride is a recycled thermoplastic material obtained from polyvinyl chloride bottles.
15. A triple-wall tubular element as defined in claim 11, wherein said polyvinyl chloride is a recycled thermoplastic material obtained from plastic cards.
16. A triple-wall tubular element as defined in claim 11, wherein said polyvinyl chloride is a recycled thermoplastic material obtained from blister packs.
17. A triple-wall tubular element as defined in claim 11, wherein said polyvinyl chloride is a recycled thermoplastic material obtained from vertical blinds.
18. A triple-wall tubular element as defined in claim 9, wherein said thermoplastic material of said intermediate layer is a acrylonitrite butadiene styrene.
19. A triple-wall tubular element as defined in claim 1, wherein the thermoplastic material of the inner layer is similar to the thermoplastic material of the outer layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2092897 CA2092897A1 (en) | 1993-03-29 | 1993-03-29 | Triple-wall tubular element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2092897 CA2092897A1 (en) | 1993-03-29 | 1993-03-29 | Triple-wall tubular element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2092897A1 true CA2092897A1 (en) | 1994-09-30 |
Family
ID=4151384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2092897 Abandoned CA2092897A1 (en) | 1993-03-29 | 1993-03-29 | Triple-wall tubular element |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2092897A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998004861A1 (en) * | 1996-07-29 | 1998-02-05 | Poloplast Kunststoffwerk Gmbh & Co. Kg | Multiple-layer pipe |
| NL1005371C2 (en) * | 1997-02-25 | 1998-08-26 | Wavin Bv | Multilayered pipe used in water disposal |
| ITVI20090248A1 (en) * | 2009-10-09 | 2011-04-10 | Fitt Spa | FLEXIBLE PIPE IN REGENERATED PVC, AS WELL AS THE METHOD OF REALIZING THE SAME |
| CN102966802A (en) * | 2012-11-20 | 2013-03-13 | 宁波贝达管业有限公司 | Reinforced-type plastic pipe |
| DE102013100112A1 (en) * | 2013-01-08 | 2014-07-10 | Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co. Kg | Method for manufacturing pipe e.g. cable guide tube made of thermoplastic material, involves setting bulk temperature of intermediate layer on outlet side of mold, below melt temperature of pipe inner wall and/or outer pipe wall |
-
1993
- 1993-03-29 CA CA 2092897 patent/CA2092897A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998004861A1 (en) * | 1996-07-29 | 1998-02-05 | Poloplast Kunststoffwerk Gmbh & Co. Kg | Multiple-layer pipe |
| NL1005371C2 (en) * | 1997-02-25 | 1998-08-26 | Wavin Bv | Multilayered pipe used in water disposal |
| ITVI20090248A1 (en) * | 2009-10-09 | 2011-04-10 | Fitt Spa | FLEXIBLE PIPE IN REGENERATED PVC, AS WELL AS THE METHOD OF REALIZING THE SAME |
| CN102966802A (en) * | 2012-11-20 | 2013-03-13 | 宁波贝达管业有限公司 | Reinforced-type plastic pipe |
| DE102013100112A1 (en) * | 2013-01-08 | 2014-07-10 | Dipl.-Ing. Dr. Ernst Vogelsang Gmbh & Co. Kg | Method for manufacturing pipe e.g. cable guide tube made of thermoplastic material, involves setting bulk temperature of intermediate layer on outlet side of mold, below melt temperature of pipe inner wall and/or outer pipe wall |
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