CA2205646A1 - Plastic tube with varying layer thickness - Google Patents
Plastic tube with varying layer thicknessInfo
- Publication number
- CA2205646A1 CA2205646A1 CA002205646A CA2205646A CA2205646A1 CA 2205646 A1 CA2205646 A1 CA 2205646A1 CA 002205646 A CA002205646 A CA 002205646A CA 2205646 A CA2205646 A CA 2205646A CA 2205646 A1 CA2205646 A1 CA 2205646A1
- Authority
- CA
- Canada
- Prior art keywords
- area
- thicknesses
- plastic tube
- layers
- varied
- 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
- 239000004033 plastic Substances 0.000 title claims abstract description 26
- 229920003023 plastic Polymers 0.000 title claims abstract description 26
- 239000000126 substance Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims 1
- 239000007795 chemical reaction product Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 65
- 238000001125 extrusion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000019589 hardness Nutrition 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920011301 perfluoro alkoxyl alkane Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
-
- 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
-
- 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
-
- 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
- F16L9/127—Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A plastic tube, particularly for use in motor vehicles, having one or more layers, has defined varying thicknesses and/or a defined varying number of layers in its longitudinal direction, such that the given end product has a characteristic profile specific to its application.
Description
CA 0220~646 1997-0~
DocketNo: 60,158-080 PLASTIC TUBE WITH VARYING LAYER THICKNESS
BACKGROUND
- The present invention provides a plastic tube having one or more layers, in which the individual layer thicknesses and/or the overall layer thickness varies.
5The use of plastic tubes for different applications in automobile construction is known.
For example, tubes made of polyamide are used for fuel, vacuum, and pneumatic lines.
Rec~llse of increasing environmental protection re~uirements, multiple layer tubes are being used more and more frequently in recent times, particularly for fuel lines.
These known plastic lines always represent a compromise in the search for an optimal 10solution in regard to all requirements, such as flexibility, permeation, behavior with regard to fire, impact resistance, as well as resistance to pressure. The main reason for this is that the tube must be manufactured in a continuously nonvarying extrusion process.
SUMl~ Y OF THE INVENTION
The present invention provides plastic tubes particularly for use in automobile 15construction which exhibit optimal characteristic profiles specific to their final applications.
By the defined varying layer thicknesses, especially for a multilayer tube, all requirements which involve the partial areas of the manufacturing line are met.
In this process, the following possibilities result, among others:
- Partial areas having a higher temperature resistance can be constructed, e.g.,20in proximity to structural components having intense radiant heat.
- Partial areas having a higher fire resistance can be constructed, e.g., in proximity to exhaust systems and electrical assemblies.
CA 02205646 1997-0~
DocketNo: 60,158-080 - Partial areas having a higher flexibility, i.e., exhibiting lower Shore hardnesses, can be constructed, e.g., in areas in which the lines are bent or for lines requiring high vibration or noise damping.
- Partial areas can have a resistance to chemicals, e.g., in proximity to brake 5 fluid containers as well as oil and cooling water filling areas. For multilayer tubes, in which there are layers consisting of materials which are nonresistant to certain media, these layers can be omitted at the line ends.
- Line ends of tubes which are multilayer in their continued progression can be constructed having a single layer in order to obtain optimal impermeability properties. There 10 is no need for bonding layers.
The manufacture of the plastic tube according to the invention takes place in multilayer extrusion systems in which a discontinuous output of the individual extruders is possible. For this purpose, the rotational speed of the screw and/or the rotational speed of the melt pumps is preferably controlled.
A further embodiment according to the invention provides plastic tubes of varying inner diameter. In this process, throttling behavior or throttle-free integration on the finished line can be achieved. Extrusion systems are used for this purpose in which the rotational speed of the screw and/or the rotational speed of the melt pumps and/or the speed of draw-off devices can be controlled independently of each other.
BRIEF DESCRIPTION OF THE DRAWINGS
The above, as well as other advantages of the present invention, will become readily apparent to those skilled in the art from the following detailed description of a CA 0220~646 1997-0~
DocketNo: 60,158-080 prefe.led embodiment when considered in the light of the accompanying drawings in which:
Figure 1 is a sectional representation of the tube wall structure of a three-layer tube having varying layer thicknesses of the inner and outer layer;
Figure 2 is a sectional representation of the tube wall structure of a three-layer tube having varying layer thicknesses of the inner, middle, and outer layers, such that the inner and middle layer thicknesses amount to zero in places; and Figure 3 is a sectional representation of a single layer tube having a constant outer diameter and a varying inner diameter.
DETAILED DESCRIPIION OF A PREFERRED EMBODIMENT
Figure 1 is a section through the tube wall of a three-layer tube (11) having an outer layer (12), middle layer (13), and inner layer (14). In the longitudinal direction of the tube (11), the layer thicknesses of the outer layer (12) and the inner layer (14) vary such that the middle layer (13) has a constant thickness. In the area (15), the outer layer (12) and the inner layer (14) show approximately equivalent layer thicknesses, while in the continued progression of the tube (11) in the area (16), the layer thickness of the outer layer (12) becomes reduced, and correspondingly the layer thickness of the inner layer (14) becomes enlarged. In the area (17), a reciprocal layer thickness change is depicted. Here, the layer thickness of the inner layer (14) becomes reduced while at the same time the layer thickness of the outer (12) layer increases. Generally, the thicknesses of the layers are between 0 and 8 mm.
CA 0220~646 1997-OS-l~
Docket No: 60,158-080 According to the invention, the transitions between the areas (5) and (6) as well as between the areas (6) and (7) should be minim~l.
The manufacture of the plastic tube according to the invention takes place in multilayer extrusion systems in which a discontinuous output of the individual extruders is 5 possible. For this purpose, the rotational speed of the screw and/or the rotational speed of the melt pumps is preferably controlled.
Figure 2 is a section through the tube wall of a three-layer tube (21) con~isting of the outer layer (22), middle layer (23) and the inner layer (24) such that the layer thicknesses of all three layers (22), (23), and (24) vary. In the area (25), the outer layer (22) and the 10 inner layer (24) again exhibit approximately equal layer thicknesses. It should be understood that the tube (21) shown in Figure 2 could be a different tube than that shown in Figure 1, or could be a different section of the same tube shown in Figure 1. In the area (28), the layer thickness of the middle layer (23) is increased in such a way that this middle layer (23) represents the outer contour of the tube (21), with the consequence that the layer thickness 15 of the outer layer (22) amounts to zero in this area (28). In the further progression of the tube (21), the layer thickness of the middle layer (23) is continuously or stepwise until it amounts to zero in the area (29), while the layer thickness of the outer layer (22) increases, corresponding to the reduction of the layer thickness of the middle layer (23).
In the area (30), the layer thickness of the inner layer (24) has likewise changed to 20 zero, so that here the tube wall of the tube (21) consists exclusively of the original outer layer (22), whose layer thickness now has a value corresponding to the original layer thicknesses of the outer layer (22), middle layer (23), as well as the inner layer (24). Again, CA 0220~646 1997-0~
DocketNo: 60,158-080 the transitions between the areas (29) and (30) should, according to the invention, be designed minim~lly.
Figure 3 is a section through a tube (31) where the tube (31) has a constant outer diameter as well as varying inner diameters. It should be understood that the tube (31) 5 shown in Figure 3 could be a different tube than that shown in Figure 1, or alternatively could be another section of the same tube. The main dimensions of the tube (31) are shown in area (33), while the inner diameter becomes considerably narrower in the further progression of the tube (31) in the area (34). Preferably, the inside diameter widens by a maximum of 25% and narrows by a maximum of 80% relative to the nominal widths.
Area (35) shows a reciprocal development such that the inner diameter has now been clearly increased as opposed to the main llimen~ions.
For the embodiments shown in Figures 1-3, it should be understood that the layers could comprise material such as PAll, PA12, PA5, POM, PMMA, PE, PP, PFA, ETFE, PVDF and their copolymers. The plastic tube can also be formed as a multichamber tube.
In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent a prer~lled embodiment. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.
DocketNo: 60,158-080 PLASTIC TUBE WITH VARYING LAYER THICKNESS
BACKGROUND
- The present invention provides a plastic tube having one or more layers, in which the individual layer thicknesses and/or the overall layer thickness varies.
5The use of plastic tubes for different applications in automobile construction is known.
For example, tubes made of polyamide are used for fuel, vacuum, and pneumatic lines.
Rec~llse of increasing environmental protection re~uirements, multiple layer tubes are being used more and more frequently in recent times, particularly for fuel lines.
These known plastic lines always represent a compromise in the search for an optimal 10solution in regard to all requirements, such as flexibility, permeation, behavior with regard to fire, impact resistance, as well as resistance to pressure. The main reason for this is that the tube must be manufactured in a continuously nonvarying extrusion process.
SUMl~ Y OF THE INVENTION
The present invention provides plastic tubes particularly for use in automobile 15construction which exhibit optimal characteristic profiles specific to their final applications.
By the defined varying layer thicknesses, especially for a multilayer tube, all requirements which involve the partial areas of the manufacturing line are met.
In this process, the following possibilities result, among others:
- Partial areas having a higher temperature resistance can be constructed, e.g.,20in proximity to structural components having intense radiant heat.
- Partial areas having a higher fire resistance can be constructed, e.g., in proximity to exhaust systems and electrical assemblies.
CA 02205646 1997-0~
DocketNo: 60,158-080 - Partial areas having a higher flexibility, i.e., exhibiting lower Shore hardnesses, can be constructed, e.g., in areas in which the lines are bent or for lines requiring high vibration or noise damping.
- Partial areas can have a resistance to chemicals, e.g., in proximity to brake 5 fluid containers as well as oil and cooling water filling areas. For multilayer tubes, in which there are layers consisting of materials which are nonresistant to certain media, these layers can be omitted at the line ends.
- Line ends of tubes which are multilayer in their continued progression can be constructed having a single layer in order to obtain optimal impermeability properties. There 10 is no need for bonding layers.
The manufacture of the plastic tube according to the invention takes place in multilayer extrusion systems in which a discontinuous output of the individual extruders is possible. For this purpose, the rotational speed of the screw and/or the rotational speed of the melt pumps is preferably controlled.
A further embodiment according to the invention provides plastic tubes of varying inner diameter. In this process, throttling behavior or throttle-free integration on the finished line can be achieved. Extrusion systems are used for this purpose in which the rotational speed of the screw and/or the rotational speed of the melt pumps and/or the speed of draw-off devices can be controlled independently of each other.
BRIEF DESCRIPTION OF THE DRAWINGS
The above, as well as other advantages of the present invention, will become readily apparent to those skilled in the art from the following detailed description of a CA 0220~646 1997-0~
DocketNo: 60,158-080 prefe.led embodiment when considered in the light of the accompanying drawings in which:
Figure 1 is a sectional representation of the tube wall structure of a three-layer tube having varying layer thicknesses of the inner and outer layer;
Figure 2 is a sectional representation of the tube wall structure of a three-layer tube having varying layer thicknesses of the inner, middle, and outer layers, such that the inner and middle layer thicknesses amount to zero in places; and Figure 3 is a sectional representation of a single layer tube having a constant outer diameter and a varying inner diameter.
DETAILED DESCRIPIION OF A PREFERRED EMBODIMENT
Figure 1 is a section through the tube wall of a three-layer tube (11) having an outer layer (12), middle layer (13), and inner layer (14). In the longitudinal direction of the tube (11), the layer thicknesses of the outer layer (12) and the inner layer (14) vary such that the middle layer (13) has a constant thickness. In the area (15), the outer layer (12) and the inner layer (14) show approximately equivalent layer thicknesses, while in the continued progression of the tube (11) in the area (16), the layer thickness of the outer layer (12) becomes reduced, and correspondingly the layer thickness of the inner layer (14) becomes enlarged. In the area (17), a reciprocal layer thickness change is depicted. Here, the layer thickness of the inner layer (14) becomes reduced while at the same time the layer thickness of the outer (12) layer increases. Generally, the thicknesses of the layers are between 0 and 8 mm.
CA 0220~646 1997-OS-l~
Docket No: 60,158-080 According to the invention, the transitions between the areas (5) and (6) as well as between the areas (6) and (7) should be minim~l.
The manufacture of the plastic tube according to the invention takes place in multilayer extrusion systems in which a discontinuous output of the individual extruders is 5 possible. For this purpose, the rotational speed of the screw and/or the rotational speed of the melt pumps is preferably controlled.
Figure 2 is a section through the tube wall of a three-layer tube (21) con~isting of the outer layer (22), middle layer (23) and the inner layer (24) such that the layer thicknesses of all three layers (22), (23), and (24) vary. In the area (25), the outer layer (22) and the 10 inner layer (24) again exhibit approximately equal layer thicknesses. It should be understood that the tube (21) shown in Figure 2 could be a different tube than that shown in Figure 1, or could be a different section of the same tube shown in Figure 1. In the area (28), the layer thickness of the middle layer (23) is increased in such a way that this middle layer (23) represents the outer contour of the tube (21), with the consequence that the layer thickness 15 of the outer layer (22) amounts to zero in this area (28). In the further progression of the tube (21), the layer thickness of the middle layer (23) is continuously or stepwise until it amounts to zero in the area (29), while the layer thickness of the outer layer (22) increases, corresponding to the reduction of the layer thickness of the middle layer (23).
In the area (30), the layer thickness of the inner layer (24) has likewise changed to 20 zero, so that here the tube wall of the tube (21) consists exclusively of the original outer layer (22), whose layer thickness now has a value corresponding to the original layer thicknesses of the outer layer (22), middle layer (23), as well as the inner layer (24). Again, CA 0220~646 1997-0~
DocketNo: 60,158-080 the transitions between the areas (29) and (30) should, according to the invention, be designed minim~lly.
Figure 3 is a section through a tube (31) where the tube (31) has a constant outer diameter as well as varying inner diameters. It should be understood that the tube (31) 5 shown in Figure 3 could be a different tube than that shown in Figure 1, or alternatively could be another section of the same tube. The main dimensions of the tube (31) are shown in area (33), while the inner diameter becomes considerably narrower in the further progression of the tube (31) in the area (34). Preferably, the inside diameter widens by a maximum of 25% and narrows by a maximum of 80% relative to the nominal widths.
Area (35) shows a reciprocal development such that the inner diameter has now been clearly increased as opposed to the main llimen~ions.
For the embodiments shown in Figures 1-3, it should be understood that the layers could comprise material such as PAll, PA12, PA5, POM, PMMA, PE, PP, PFA, ETFE, PVDF and their copolymers. The plastic tube can also be formed as a multichamber tube.
In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent a prer~lled embodiment. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.
Claims (15)
1. A plastic tube, especially for use in the construction of automotive vehicles, comprising at least one layer having a thickness which varies in an axial direction.
2. The plastic tube of Claim 1, wherein said at least one layer is a plurality of layers having thicknesses which vary in a predetermined way in the axial direction.
3. The plastic tube as claimed in Claim 1, wherein an outside diameter of the tube along the entire length of the tube is maintained constant and an inside diameter of the tube in the axial direction widens by a maximum of 25% and narrows by a maximum of 80%, relative to the nominal width.
4. The plastic tube as claimed in Claim 1, wherein the thickness of the individual layers is within a range from 0-0.8mm.
5. The plastic tube as claimed in Claim 1, wherein said at least one layer comprises three layers having thicknesses that vary in a complementary manner in the axial direction such that the total thickness of the three layers remains constant.
6. A plastic tube comprising a plurality of layers each having a layer thickness which varies in an axial direction such that the total thickness of the layers remains constant.
7. The plastic tube of Claim 6, wherein the thicknesses of said layers are varied in a first area to provide higher temperature resistance.
8. The plastic tube of Claim 7, wherein said thicknesses of said layers are varied in a second area axially spaced from said first area to provide higher flexibility.
9. The plastic tube of Claim 6, wherein said thicknesses of said layers are varied in a third area to provide resistance to chemicals.
10. The plastic tube of Claim 6, wherein said thicknesses of said layers are varied in a fourth area to provide optimal impermeability properties.
11. The plastic tube of Claim 6, wherein said thicknesses of said layers are varied in a fifth area to provide fire resistance.
12. The plastic tube of Claim 6, wherein said thicknesses are varied in a first area, a second area axially spaced from said first area, a third area axially spaced from said first area and said second area, wherein said thicknesses are varied in said first area to provide higher temperature resistance than in said second area and said third area, said thicknesses are varied in said second area to provide higher flexibility than in said first area and said third area, and said thicknesses are varied in said third area to provide higher resistance to chemicals than said first area and said second area.
13. The plastic tube of Claim 6, wherein the number of said plurality of layers varies in said axial direction.
14. A plastic tube, especially for use in the construction of automotive vehicles, comprising:
a plurality of layers each having a thickness;
a first area axially spaced from a second area, a third area axially spaced from said first area and said second area, wherein said thicknesses are varied in said first area to provide higher temperature resistance than in said second area and said third area, said thicknesses are varied in said second area to provide higher flexibility than in said first area and said third area, and said thicknesses are varied in said third area to provide higher resistance to chemicals than said first area and said second area.
a plurality of layers each having a thickness;
a first area axially spaced from a second area, a third area axially spaced from said first area and said second area, wherein said thicknesses are varied in said first area to provide higher temperature resistance than in said second area and said third area, said thicknesses are varied in said second area to provide higher flexibility than in said first area and said third area, and said thicknesses are varied in said third area to provide higher resistance to chemicals than said first area and said second area.
15. The plastic tube of Claim 14, wherein the number of said plurality of layers varies in said axial direction.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19549470A DE19549470C2 (en) | 1995-03-09 | 1995-03-09 | Plastic pipe with one or several layers differing in thickness along length |
| DE19549471A DE19549471C3 (en) | 1995-03-09 | 1995-03-09 | Plastic pipe with varying layer thicknesses of the inner and outer layer of a multi-layer pipe |
| DE19508412A DE19508412C2 (en) | 1995-03-09 | 1995-03-09 | Plastic pipe with varying layer thicknesses |
| CA002205646A CA2205646A1 (en) | 1995-03-09 | 1997-05-15 | Plastic tube with varying layer thickness |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19549470A DE19549470C2 (en) | 1995-03-09 | 1995-03-09 | Plastic pipe with one or several layers differing in thickness along length |
| DE19549471A DE19549471C3 (en) | 1995-03-09 | 1995-03-09 | Plastic pipe with varying layer thicknesses of the inner and outer layer of a multi-layer pipe |
| DE19508412A DE19508412C2 (en) | 1995-03-09 | 1995-03-09 | Plastic pipe with varying layer thicknesses |
| CA002205646A CA2205646A1 (en) | 1995-03-09 | 1997-05-15 | Plastic tube with varying layer thickness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2205646A1 true CA2205646A1 (en) | 1998-11-15 |
Family
ID=27427359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002205646A Abandoned CA2205646A1 (en) | 1995-03-09 | 1997-05-15 | Plastic tube with varying layer thickness |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2205646A1 (en) |
| DE (1) | DE19508412C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19629740B4 (en) * | 1996-07-23 | 2006-01-12 | Peter Denk | lightweight component |
| JPH10296910A (en) * | 1997-04-25 | 1998-11-10 | Usui Internatl Ind Co Ltd | Overlap-coated metallic tube and method for forming coating thereof |
| JP4345995B2 (en) * | 1997-05-20 | 2009-10-14 | 臼井国際産業株式会社 | Polymer coated metal tube |
| DE19826950C1 (en) * | 1998-06-17 | 1999-09-23 | Hewing Gmbh | Protective tube for a supply line especially a plastic or plastic-coated media transport pipe such as a water or heating pipe |
| DE10012676A1 (en) * | 2000-03-15 | 2001-09-20 | Behr Gmbh & Co | Heating circuit for vehicles uses the vehicle engine, and a heater radiator as a heat source |
| JP7382149B2 (en) * | 2019-03-19 | 2023-11-16 | 住友理工株式会社 | multilayer tube |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2049545A1 (en) * | 1969-10-13 | 1971-04-22 | Sherwood Medical Ind Inc | Extrusion press |
| US4283447A (en) * | 1979-05-18 | 1981-08-11 | Flynn Vincent J | Radiopaque polyurethane resin compositions |
| DE3439670C2 (en) * | 1984-10-30 | 1987-02-05 | Fa. Carl Freudenberg, 6940 Weinheim | One-piece tubular molding |
| DE8915502U1 (en) * | 1989-01-07 | 1990-08-23 | Phoenix Ag, 2100 Hamburg | Hose |
| DE9416411U1 (en) * | 1994-10-12 | 1995-01-19 | Karl Schöngen KG Kunststoff-Rohrsysteme, 38229 Salzgitter | Pipe, especially plastic pipe, and pipe connection from such pipes |
-
1995
- 1995-03-09 DE DE19508412A patent/DE19508412C2/en not_active Expired - Fee Related
-
1997
- 1997-05-15 CA CA002205646A patent/CA2205646A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE19508412A1 (en) | 1996-09-26 |
| DE19508412C2 (en) | 2003-04-10 |
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| DE29504100U1 (en) | Plastic pipe with varying layer thicknesses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |