GB1595128A - Method of making lightweight rigid thermoplastics pipe - Google Patents
Method of making lightweight rigid thermoplastics pipe Download PDFInfo
- Publication number
- GB1595128A GB1595128A GB19919/78A GB1991978A GB1595128A GB 1595128 A GB1595128 A GB 1595128A GB 19919/78 A GB19919/78 A GB 19919/78A GB 1991978 A GB1991978 A GB 1991978A GB 1595128 A GB1595128 A GB 1595128A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pipe
- thermoplastics
- thermoplastics material
- die
- intermediate layer
- 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.)
- Expired
Links
- 229920001169 thermoplastic Polymers 0.000 title description 43
- 239000004416 thermosoftening plastic Substances 0.000 title description 43
- 238000004519 manufacturing process Methods 0.000 title description 11
- 239000000463 material Substances 0.000 description 32
- 239000010410 layer Substances 0.000 description 16
- 239000002344 surface layer Substances 0.000 description 15
- 239000004088 foaming agent Substances 0.000 description 14
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 13
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 12
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000004156 Azodicarbonamide Substances 0.000 description 5
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 5
- 235000019399 azodicarbonamide Nutrition 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OMIHGPLIXGGMJB-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]hepta-1,3,5-triene Chemical compound C1=CC=C2OC2=C1 OMIHGPLIXGGMJB-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 229920000578 graft copolymer Polymers 0.000 description 2
- 229920001748 polybutylene Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
- B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
(54) METHOD OF MAKING LIGHTWEIGHT, RIGID,
THERMOPLASTICS PIPE
(71) We, BORG-WARNER
CORPORATION, a Corporation duly organised and existing under the and by virtue of the laws of the State of Delaware having its principal office and place of business at 200 South Michigan Avenue,
Chicago Illinois, U.S.A., do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described, in and by the following statement:- The present invention relates to a method of making lightweight, rigid thermoplastics pipe and tubing and the product made thereby. Thermoplastics pipe made of unfoamed plastics such as polyvinyl chloride (PVC) and graft acrylonitrilebutadient-styrene(ABS) is sold in huge quantities for use in water supply, sanitary and storm pipes, as well as many other applications. One great advantage of the thermoplastics pipe is that it is lighter in weight then the pipe it usually replaces or displaces; another advantage is its ease of fabrication into fluid systems. Its structural integrity is good for many applications, but improvement is desired in other applications.
During the past twenty (20) years, thermoplastics containing a foaming agent have found acceptance in many industries, but the use of foamable thermoplastics for many pipe applications is limited due to the fluid leakage problems with foamed thermoplastics pipe, or by costly and inefficient methods of making the pipe resistant to leakage.
For many applications a desirable pipe is a smooth surfaced, fluid impervious pipe of a thickness to give it good structural integrity but light enough to have the lightweight and ease of fabrication advantages of plastics pipe. A simple, inexpensive and improved method of making such a pipe and the pipe made by such method is the subject matter of this invention.
The present invention provides a method of making a lightweight, rigid thermoplastics pipe having unfoamed interior and exterior surface layers and a foamed intermediate layer, the method comprising heating a first thermoplastics material in a first extruder, heating a second thermoplastics material containing a heat decomposable chemical foaming agent in a second extruder to a temperature at least equal to the decomposition temperature of the foaming agent, feeding said first thermoplastics material and said second thermoplastics material simultaneously and respectively through separate passages of a pipe die head, dividing said first thermoplastics material into two streams to form the interior and exterior surface layers of the pipe, the chemical foaming agent of said second thermoplastics material decomposing as a result of said heating step but said second thermoplastics material remaining in a foamable but unfoamed state due to pressures within said second extruder and the pipe die head until the pressure is reduced as the second thermoplastics material leaves said die head, whereby the solid interior and exterior surface layers of the pipe and the foamed intermediate layer thereof are formed simultaneously.
The exterior and interior surface layers and the foamed intermediate layer are preferably of the same thermoplastics material. The foamed intermediate layer may, however, be of a different plastics provided it is compatible with the plastics used for the exterior and interior surface layers.
The thermoplastics material(s) utilized in making the pipe may be ABS, PVC, phenylene oxide polymer, polycarbonate, polyethylene, polypropylene, polystyrene, polybutylene or combinations thereof. The second, or foamable, thermoplastics material which forms the foamed intermediate layer contains a heat decomposable chemical foaming or blowing agent which is incorporated into 2 thermoplastics material prior to charging the second thermoplastics material to the second extruder. Suitable foaming agents are bicarbonate of soda and citric acid, azodicarbonanide and the N-nitroso compunds. Modern Plastics Encyclopedia, 1975-1976, at pages 127-129, discloses other chemical foaming agents which can be utilized in making foamed thermoplastics materials.
The apparatus employed for carrying out the method of the present invention comprises first and second extruders, connected to a single die head having multiple passages for receiving and forming the thermoplastics materials discharged by the extruders.
The method of the invention will be described in more detail by reference to the drawings wherein:
Figure 1 is a sectional view of an extrusion die used in making a pipe; and
Figure 2 is a cross-sectional view of the pipe as it exits the extrusion die of Figure 1.
Disclosed in Figure 1 is an extrusion die head utilized for carrying out the method of the present invention and designated generally by the reference numeral 10. The head 10 comprises an adapter member 11, a die plate 12 and a forming die 13. The adapter member 11 comprises a housing 11' having openings 14 and 15 which are attached respectively to the discharge end of two screw extruders (not shown). An inlet plate 16 is provided in the housing 11' and contains an opening 17 and a diverter plug or mandrel 18. A plurality of passageways 19 are in communication with the openings 17 and 14.
The opening 15 in the housing 11' is in communication with a passageway 21 which in turn is in communication with passageways 22 and 23. The passageways 23 communicate with passageways 25 provided in a flow restrictor 26. Passageway 22 is formed by a bore in the housing 11' and a bore in a nozzle element 22'. A restriction 26' is formed by the interior surface of the flow restrictor 26 and the exterior surface cf the nozzle 22'.
The die plate 12 contains a mandrel or spreader 27 and a die orifice 18. The forming die contains a tubular passageway 29 and is heated and/or cooled by fluid passages 31 which are connected to a conventional heat exchanger (not shown).
In the utilization of the head 10 to carry out the present invention to form the pipe 32 of Figure 2, which pipe has unfoamed interior and exterior surface layers 33, 34 and a foamed intermediate layer 35, a first thermoplastics material, which has been heated to its melt temperature in a first extruder (not shown), enters the opening 15 and passes through the passageway 21 and to the passageways 22 and 23. A portion of the first thermoplastics material passes through passageway 23 to the manifold 24, thence through the passageways 25, through the restriction 25', the die orifice 28 and through the tubular passageway 29 of the forming die 13 to form the exterior surface layer 34 of pipe 32. At the same time, another portion of the first thermoplastics material flows from passageway 21 through passageway 22, by spreader 27, through the die orifice 28 and the passageway 29 of the forming die 13 to form the interior surface layer 33 of a pipe 32.
Simultaneously, a foamable thermoplastics material is discharged from a second extruder (not shown) into the opening 14 and passes through the opening 17, past the diverter plug 18, through the passageways 19, through the restriction 26' and thence through the centre of the die orifice 28 and the passageway 29 of the forming die 13, to form the intermediate layer 35 of the pipe 32.
The preferred embodiment of the present invention is the manufacture of the pipe 32 made of a graft polymer of acrylonitrilebutadiene-styrene (ABS) having unfoamed interior and exterior surface layers 33, 34 of
ABS and a foamed ABSC intermediate layer 35. Molten ABS containing no foaming agent and at a temperature of 400"F enters the opening 15 under pressure from the first extruder and passes through the passageways 22 and 23 and their communicating passageways, through the die orifice 28 and forming orifice 29 to form the inner and outer surface layers 33, 34, respectively, of the pipe 32. The ABS is in pellet form and is a product prepared by polymerising 25 parts by weight acrylonitrile and 45 parts by weight styrene in the presence of 30 parts by weight of polybutadiene. A batch of the same ABS was made into a foamable compound by compounding therein 0.3 parts per hundred of azodicarbonamide at a temperature below the decomposition temperature (about 385"F to about 400"F) of the azodicarbonamide. The compounded, foamable ABS composition was then pelletized and charged to the second extruder wherein it was heated progressively to a temperature of 400"F. At this temperature, the composition was molten and the azodicarbonamide had decomposed. The composition, however, had not completely "foamed" due to the inherent pressures in the extruder.
The molten and foamable ABS enters the opening 14 of the adapter member 11 and passes, still under pressure, through the opening 17, the openings 19, the restriction 26' and the centre of the die orifice 28 to form the intermediate layer 35 of the pipe 32. As the coextruded solid and foamable
ABS leaves the die orifice 28, it enters the passageway 29 of the forming die where the intermediate layer of foamable ABS expands due to a reduction in pressure, thus forming the pipe 32 with its unfoamed interior and exterior surface layers 33, 34 and its foamed intermediate layer 35.
While the preferred embodiment of the present invention has been described with respect to the manufacture of ABS pipe having a foamed intermediate layer, the invention is applicable to the manufacture of pipes of other thermoplastics materials such as PVC, phenylene oxide polymers, polycarbonates, polyethylenes, polypropylene, polystyrene and polybutylene. It is also contemplated that the foamed intermediate layer can be made of one thermoplastics material and the interior and exterior surface layers of another thermoplastics material.
Azodicarbonamide was used in the preferred embodiment for foaming the intermediate ABS layer of the pipe.
However, it is contemplated that other chemical foaming agents can be employed.
Modern Plastics Encyclopedia, 1975-1976, at pages 127-129, discloses the use of azodicarbonamide as a foaming agent as well as many other chemical foaming agents suitable for use in carrying out the present invention.
Also, while a particular die head 10 has been described as one means for carrying out the present method, other die heads as well as other feed means to the openings 14 and 15 can be employed.
WHAT WE CLAIM IS:
1. A method of making a lightweight, rigid thermoplastics pipe having unfoamed interior and exterior surface layers and a foamed intermediate layer, the method comprising heating a first thermoplastics material in a first extruder, heating a second thermoplastics material containing a heat decomposable chemical foaming agent in a second extruder to a temperature at least equal to the decomposition temperature of the foaming agent, feeding said first thermoplastics material and said second thermoplastics material simultaneously and respectively through separate passages of a pipe die head, dividing said first thermoplastics material into two streams to form the interior and exterior surface layers of the pipe, the chemical foaming agent of said second thermoplastics material decomposing as a result of said heating step but said second thermoplastics material remaining in a foamable but unfoamed state due to pressures within said second extruder and the pipe die head until the pressure is reduced as the second thermoplastics material leaves said die head, whereby the solid interior and exterior surface layers of the pipe and the foamed intermediate layer thereof are formed simultaneously.
2. A method according to claim I wherein the first thermoplastics material and the second thermoplastics material each comprise a graft polymer of acrylonitrile, styrene and butadiene.
3. A method according to claim 1 substantially as described with reference to
Figure 1 of the accompanying drawings.
4. A thermoplastics pipe when made by a method as claimed in any one of the pre
Claims (1)
- ceding claims.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US79692177A | 1977-05-16 | 1977-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1595128A true GB1595128A (en) | 1981-08-05 |
Family
ID=25169403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19919/78A Expired GB1595128A (en) | 1977-05-16 | 1978-05-16 | Method of making lightweight rigid thermoplastics pipe |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS53141367A (en) |
| AU (1) | AU520032B2 (en) |
| CA (1) | CA1109619A (en) |
| DE (1) | DE2821333C2 (en) |
| FR (1) | FR2391058A1 (en) |
| GB (1) | GB1595128A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2271160A (en) * | 1992-10-01 | 1994-04-06 | Yong Goo Shin | High impact strength pipe |
| GB2299049A (en) * | 1995-03-22 | 1996-09-25 | Glynwed Steel Tubes Ltd | Method for making plastics-coated tube |
| US6589646B1 (en) | 1999-05-06 | 2003-07-08 | Basf Aktiengesellschaft | Composite layered sheet of film for refrigerators |
| EP1419871A1 (en) * | 1995-12-12 | 2004-05-19 | Uponor Innovation Ab | Method and apparatus for producing multilayer plastic pipe |
| DE202009007494U1 (en) | 2009-05-26 | 2009-09-17 | Dow Global Technologies, Inc., Midland | Multilayer thermoplastic sheet materials and thermoformed articles made therefrom |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2455972A1 (en) * | 1979-05-10 | 1980-12-05 | Sogecan Ste Gle Canalisations | PROCESS AND APPARATUS FOR THE EXTRUSION OF PLASTIC TUBES WITH COMPOSITE WALLS |
| IT1126452B (en) * | 1979-11-30 | 1986-05-21 | Mario Calcagni | EXTRUSION HEAD FOR PROFILES FOR FIXTURES AND SIMILAR, AS WELL AS PROFILE OBTAINED |
| US4465449A (en) * | 1982-12-06 | 1984-08-14 | Borg-Warner Chemicals, Inc. | Coextrusion feedblock for making lightweight, rigid thermoplastic pipe |
| US4507071A (en) * | 1983-05-12 | 1985-03-26 | Cosden Technology, Inc. | Coextrusion apparatus for producing multiple layered thermoplastic pipe |
| US4499041A (en) * | 1983-05-23 | 1985-02-12 | Cosden Technology, Inc. | Coextrusion process for producing multiple layered thermoplastic pipe |
| FR2564375B1 (en) * | 1984-05-18 | 1987-03-06 | Eternit Financiere | PROCESS FOR THE MANUFACTURE OF LIGHTWEIGHT, RIGID TUBES IN THERMOPLASTIC MATERIAL |
| JPS6228222A (en) * | 1985-07-30 | 1987-02-06 | Sumitomo Chem Co Ltd | Manufacture of polypropylene-based resin expanded pipe |
| DE9409077U1 (en) * | 1994-06-03 | 1994-08-11 | Augst, Reiner, 02689 Wehrsdorf | Floatable, swirlable carrier material for biotechnological processes |
| DE69629491T2 (en) | 1995-12-12 | 2004-06-17 | Uponor Innovation Ab | METHOD FOR PRODUCING HOMOGENEOUS MATERIALS WITH AN EXTRUDER, AND EXTRUDER |
| IT237599Y1 (en) * | 1996-07-29 | 2000-09-13 | Poloplast Kunststoffwerk | MULTI-LAYER PIPE |
| NL1005371C2 (en) * | 1997-02-25 | 1998-08-26 | Wavin Bv | Multilayered pipe used in water disposal |
| US6183673B1 (en) * | 1998-04-24 | 2001-02-06 | Industrial Thermo Ploymers Limited | Method for forming extruded foam with surface coating |
| ES2578732T3 (en) * | 2011-03-17 | 2016-07-29 | Ems-Patent Ag | Sleeve body |
| EP2666803B1 (en) | 2012-05-23 | 2018-09-05 | Ems-Patent Ag | Scratch-proof, transparent and ductile copolyamide moulding materials, moulded parts produced from same and use of same |
| PL2746339T3 (en) | 2012-12-18 | 2015-05-29 | Ems Patent Ag | Polyamide form mass and moulded parts produced from same |
| EP2778190B1 (en) | 2013-03-15 | 2015-07-15 | Ems-Patent Ag | Polyamide moulding material and moulded body produced from the same |
| DE102013105749B4 (en) * | 2013-06-04 | 2015-09-03 | W. Müller GmbH | Extrusion hose head for discontinuous foaming |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL261319A (en) * | 1960-02-24 | 1900-01-01 | ||
| US3561493A (en) * | 1965-04-21 | 1971-02-09 | Paul Maillard | Composite tubes and method of manufacturing same |
| DE6602679U (en) * | 1966-05-18 | 1969-06-26 | Ruetgerswerke Und Teerverwertung Ag | HEAT-INSULATED PIPES AND PIPE PARTS MADE OF PLASTICS |
| AT325299B (en) * | 1967-02-27 | 1975-10-10 | Hegler Wilhelm | DEVICE FOR MANUFACTURING TUBES FROM THERMOPLASTIC PLASTIC |
| GB1211860A (en) * | 1967-10-03 | 1970-11-11 | Ici Ltd | A process for the production of pipe |
| US3855376A (en) * | 1971-04-15 | 1974-12-17 | Mitsubishi Rayon Co | Process for making structural material having a foamed inner layer |
| DE2236375A1 (en) * | 1972-07-25 | 1974-02-07 | Technoform Caprano U Brunnhofe | Plastic pipes for hot water - with polyolefin inner layer and polyamide outer layer |
-
1978
- 1978-05-01 CA CA302,380A patent/CA1109619A/en not_active Expired
- 1978-05-04 AU AU35752/78A patent/AU520032B2/en not_active Expired
- 1978-05-11 FR FR7814036A patent/FR2391058A1/en active Granted
- 1978-05-15 JP JP5747278A patent/JPS53141367A/en active Granted
- 1978-05-16 DE DE2821333A patent/DE2821333C2/en not_active Expired
- 1978-05-16 GB GB19919/78A patent/GB1595128A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2271160A (en) * | 1992-10-01 | 1994-04-06 | Yong Goo Shin | High impact strength pipe |
| GB2271160B (en) * | 1992-10-01 | 1996-06-12 | Yong Goo Shin | High impact strength pipe |
| GB2299049A (en) * | 1995-03-22 | 1996-09-25 | Glynwed Steel Tubes Ltd | Method for making plastics-coated tube |
| GB2299049B (en) * | 1995-03-22 | 1998-09-23 | Glynwed Steel Tubes Ltd | Plastics-coated tube |
| EP1419871A1 (en) * | 1995-12-12 | 2004-05-19 | Uponor Innovation Ab | Method and apparatus for producing multilayer plastic pipe |
| US6589646B1 (en) | 1999-05-06 | 2003-07-08 | Basf Aktiengesellschaft | Composite layered sheet of film for refrigerators |
| DE202009007494U1 (en) | 2009-05-26 | 2009-09-17 | Dow Global Technologies, Inc., Midland | Multilayer thermoplastic sheet materials and thermoformed articles made therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1109619A (en) | 1981-09-29 |
| AU3575278A (en) | 1979-11-08 |
| DE2821333A1 (en) | 1978-11-30 |
| FR2391058A1 (en) | 1978-12-15 |
| FR2391058B1 (en) | 1981-07-24 |
| JPS6130892B2 (en) | 1986-07-16 |
| JPS53141367A (en) | 1978-12-09 |
| DE2821333C2 (en) | 1984-08-23 |
| AU520032B2 (en) | 1982-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950516 |