CA2529483A1 - Method and system for forming a reducer for pipes - Google Patents
Method and system for forming a reducer for pipes Download PDFInfo
- Publication number
- CA2529483A1 CA2529483A1 CA002529483A CA2529483A CA2529483A1 CA 2529483 A1 CA2529483 A1 CA 2529483A1 CA 002529483 A CA002529483 A CA 002529483A CA 2529483 A CA2529483 A CA 2529483A CA 2529483 A1 CA2529483 A1 CA 2529483A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- heating medium
- heating
- mould member
- tank
- 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
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
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
- B29C57/02—Belling or enlarging, e.g. combined with forming a groove
- B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
- B29C2035/042—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water
- B29C2035/043—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids other than water oil
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
This invention concerns a method and a system for forming a reducer from a pipe of polymeric material, said method comprising the steps of : cutting the pipe to a required length; placing one end of the pipe onto the top of a conical mould member in a bath of a heating medium; heating said end of the pipe by the heating medium in the bath to a softening temperature of the polymeric material; applying a pressure to the other end of the pipe in order to push the pipe to a predetermined extent onto the mould member; and cooling the heated pipe when pushing is finished.
Description
METHOD AND SYSTEM FOR FORMI1~G A REDUCER FOR PIPES
BACKGROUND OFrTHE INVENTION
This invention relates to a method and a system for forming a reducer from a pipe made of polymeric material. Formation of a reducer for a pipe by way of machining and jointing causes several known problems, for instance notch formation at the machined surfaces and joint. In order to provide an adequate flow property for a fluid and to reduce pressure loss when the fluid is flowing through a conventional reduction, formation of a smooth reducer having no machined surface will reduce the problems and increase the service life of the fitting.
According to a known method a reduction or reducer is made using a machined piece of a thick walled pipe or by moulding to a required size having a higher angle of inclination, and welded to a main or a branch pipe using a butt fusion or another suitable method. As the reduction pieces are machined the probability of having a notch on the inside and the outside surface of the piece can cause a crack and thereby possible leakage during the application. It is also well known that pipe walls are subject to wear and pressure losses appear at locations where the cross sectional area of a pipe changes, due to the welding and the short length of the reductions particularly if abrasive or similar kind of material is transported in the pipe. Gener-ally the reducers are made in short lengths by way of machining or injection mould-ing machined pieces, which are welded to, form a reduction in case of small diameter pipes of polymeric material, which becomes more tedious in cases of pipes having a 2 5 bigger diameter, which is the subject matter of the invention.
Excessive wear occurs generally at a joint. It is also known to reinforce a joint by adding additional material to the pipe near the joint either onto the outside or onto the inside. However when the material is added onto the inside of the pipe (e.g. by a liner) the internal cross section of the pipe is reduced causing an impediment to a flow through the joint. It would not be cost effective to produce pipes for special joints having increased thickness for a small quantity of fittings in discussion. An- ~ ~
other method is to reinforce onto the exterior of a pipe near a joint by using either a thermosetting polymer or additional polymer of same type as that in the pipe, which method will need an additional process.
SIIwEVIARY OF THE llVVENTION
The object of the present invention is to build up a smooth reduction for any com-monly available pipe size, which permits formation of a reduction having a strength equal to or better than that of the machined part, preferably by using standard equipment. Further the object of the invention is to provide an inexpensive method employing the polymeric material of the pipe to foim a reduction without affecting the hydraulics of a fluid flowing in the pipe and requiring little preparation to be car-ried out, by which the method will result in a finished product having a prolonged life even when used under wearing conditions and causing no constriction of flow or increase in the pressure, which would occur by the sudden reduction due to the short length of reductions formed by machining or any other method. This is achieved with a method characterized by the following steps:
- Cutting the pipe to a required length;
- Placing one end of the pipe onto the top of a conical mould member in a bath 2 0 of a heating medium;
- Heating said end of the pipe by the heating medium in the bath to a softening temperature of the polymeric material;
- Applying a pressure to the other end of the pipe in order to push the pipe to a predetermined extent onto the mould member; and Z 5 - Cooling the heated pipe when pushing is finished.
By this method a smooth reduction for any available pipe size can be built up.
According to a preferred embodiment of the invention heated heating medium is 30 pumped into the bath, which heating medium is arranged to heat the pipe wall both from outside and inside. Preferably the heating medium is continuously circulated between the bath and a heatinb equipment. (l The heating medium is preferably oil, such as ethylene glycol or possibly silicone or any other suitable oil, which will not degrade the pipe surface..
. Heating of the heating medium is preferably stopped as soon as a predetermined dimension of the reduction is achieved but the circulation of the heating medium is continued till it is cooled, which will hurry up the cooling process.
The invention also concerns a system for forming a long reducer made of polymeric material comprising:
An equipment for cutting the pipe to a required length;
- A conical forming member;
- A tank into which said forming member is mounted, said tank having an inlet and an outlet for a heating medium;
- An equipment for heating said heating medium; and - A cylinder piston device mounted on a stationary frame above said tank and arranged to apply a pushing force to a cut pipe placed onto the top of said conical forming member.
The system according to the invention provides a lot of advantages, e.g. the use of a heating medium preferably a liquid for heating only that portion of the exterior and interior surface of a main pipe, where the reduction is to be formed. Such a heating will enable fully controllable heating of the pipe material. The reduction is formed when the heated pipe end is pushed on the conical forming member, the top of which 2 5 has a smaller diameter than the inner diameter of the pipe to be formed to a reducer.
The pipe is pressed towards the conical forming member by means of the cylinder piston equipment pushing the other end of the pipe. Thus the main pipe will be hold in position by the conical forming member and the force of the cylinder piston device requiring no further fixture.
Jl The inlet and the outlet of the tank, which advantageously is insulated, are preferably communicating with a heating device, such as a heat exchanger having control means for maintaining a predetermined temperature of the heating medium.
In a preferred embodiment the stationary frame comprises vertical frame posts and a horizontal bar onto which said cylinder piston device is mounted. Said horizontal bar is parallel to the end surface of a pipe, which has been placed onto the top of the conical forming member.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the enclosed drawing, wherein Fig. 1 shows a schematic side view of an example of the system according to the invention;
Fig..2 shows a schematic side view of a pipe placed on the top of a conical forming member according to the invention; i Fig.3 shows a schematic section of the pipe in Fig. 2 when partially pressed down over the conical forming member;
Fig. 4 shows a schematic section of a reducer in final position of pressing;
and Fig. 5 shows a section of a formed reducer.
DETAILED DESCRIPTION OF TI-~ INVENTION
3 0 The system according to the invention for forming a reducer comprises in the dis-closed embodiment a cylindrical tank 5 provided with a conical forming member 6 at i its bottom, having a dimension and shape corresponding to the inner shape of a re-ducer to be formed. The conical .forming member 6 has preferably a cone angle in the range of 15 to 20°. The tank 5 is intended to receive a heating medium through an inlet 11 at the upper end of the tank 5 and near the bottom end of the tank 5 is an outlet 12 for said heating medium enabling the heating medium to be circulated be-5 tween a heat exchanger 2 outside the tank S and said tank 5. The heating medium is preferably an oil such as ethylene glycol or silicone. In a preferred embodiment an oil heating system or heat exchanger is used manufactured by Tool temp AG in Swit-zerland. The heating system, which is connected to an electric source, is controlled by means of a PID temperature controller. The tubes connecting the inlet I 1 and outlet 12 to the heat exchanger 2 are preferably heat insulated in order to prevent loss of heat.
The system further comprises a stationary frame with two vertical frame posts connected by a horizontal bar I, which extends diagonally above the tank 5. A
cylin-der piston device 3 is mounted on said horizontal bar l, concentrically with the cen-tral axis of the conical forming member 6. Said cylinder piston device 3 is intended to a apply a pushing force to a previously cut pipe 4, placed concentrically upon the conical forming member 6, as shown in fig. 2. For that reason the end of the piston rod of said cylinder piston device 3 is provided with a horizontal plate 8 acting at the 2 0 upper end of the pipe 4. The lower end of the pipe 4 is then sunk in a bath formed by the heating medium in the tank 5 and will thus be heated to its softening tempera-ture. When the polymeric material in the pipe wall has reached a sufficient degree of softness the cylinder piston device 3 will be activated to push the pipe downwards over the conical forming member 6 until a predetermined length of the reducer is 2 5 ~ achieved, i.e. the bottom end of the conically expanded pipe has been pushed to the bottom end of the conical forming member 6 or possibly to a predetermined level above said bottom end. DifFerent stages of the pushing operation is shown in fig. 3 and fig. 4, and in fig. 5 a ready formed reducer 9 is disclosed.
~r EXAMPLE:
When a reducer of 1000xI200 SDR 15 PE100 is to be made a pipe 4 of 1000 SDR15 is used. The lower end of the pipe 4 is heated in the bath to 140°C and by applying a pressure of 100 bar to the cylinder piston device 3. When the pipe 4 has been pushed down to a predetermined level over the conical forming member 6 the entire system is cooled. After cooling the formed reducer is taken out of the bath away from the conical forming device 6, whereby a reducer as that shown in fig. 5 is received. The upper end of the conical forming member 6 has preferably a diameter, which is 25 % smaller than the inner diameter of the pipe 4 and has, a cone angle of 20°.
ii
BACKGROUND OFrTHE INVENTION
This invention relates to a method and a system for forming a reducer from a pipe made of polymeric material. Formation of a reducer for a pipe by way of machining and jointing causes several known problems, for instance notch formation at the machined surfaces and joint. In order to provide an adequate flow property for a fluid and to reduce pressure loss when the fluid is flowing through a conventional reduction, formation of a smooth reducer having no machined surface will reduce the problems and increase the service life of the fitting.
According to a known method a reduction or reducer is made using a machined piece of a thick walled pipe or by moulding to a required size having a higher angle of inclination, and welded to a main or a branch pipe using a butt fusion or another suitable method. As the reduction pieces are machined the probability of having a notch on the inside and the outside surface of the piece can cause a crack and thereby possible leakage during the application. It is also well known that pipe walls are subject to wear and pressure losses appear at locations where the cross sectional area of a pipe changes, due to the welding and the short length of the reductions particularly if abrasive or similar kind of material is transported in the pipe. Gener-ally the reducers are made in short lengths by way of machining or injection mould-ing machined pieces, which are welded to, form a reduction in case of small diameter pipes of polymeric material, which becomes more tedious in cases of pipes having a 2 5 bigger diameter, which is the subject matter of the invention.
Excessive wear occurs generally at a joint. It is also known to reinforce a joint by adding additional material to the pipe near the joint either onto the outside or onto the inside. However when the material is added onto the inside of the pipe (e.g. by a liner) the internal cross section of the pipe is reduced causing an impediment to a flow through the joint. It would not be cost effective to produce pipes for special joints having increased thickness for a small quantity of fittings in discussion. An- ~ ~
other method is to reinforce onto the exterior of a pipe near a joint by using either a thermosetting polymer or additional polymer of same type as that in the pipe, which method will need an additional process.
SIIwEVIARY OF THE llVVENTION
The object of the present invention is to build up a smooth reduction for any com-monly available pipe size, which permits formation of a reduction having a strength equal to or better than that of the machined part, preferably by using standard equipment. Further the object of the invention is to provide an inexpensive method employing the polymeric material of the pipe to foim a reduction without affecting the hydraulics of a fluid flowing in the pipe and requiring little preparation to be car-ried out, by which the method will result in a finished product having a prolonged life even when used under wearing conditions and causing no constriction of flow or increase in the pressure, which would occur by the sudden reduction due to the short length of reductions formed by machining or any other method. This is achieved with a method characterized by the following steps:
- Cutting the pipe to a required length;
- Placing one end of the pipe onto the top of a conical mould member in a bath 2 0 of a heating medium;
- Heating said end of the pipe by the heating medium in the bath to a softening temperature of the polymeric material;
- Applying a pressure to the other end of the pipe in order to push the pipe to a predetermined extent onto the mould member; and Z 5 - Cooling the heated pipe when pushing is finished.
By this method a smooth reduction for any available pipe size can be built up.
According to a preferred embodiment of the invention heated heating medium is 30 pumped into the bath, which heating medium is arranged to heat the pipe wall both from outside and inside. Preferably the heating medium is continuously circulated between the bath and a heatinb equipment. (l The heating medium is preferably oil, such as ethylene glycol or possibly silicone or any other suitable oil, which will not degrade the pipe surface..
. Heating of the heating medium is preferably stopped as soon as a predetermined dimension of the reduction is achieved but the circulation of the heating medium is continued till it is cooled, which will hurry up the cooling process.
The invention also concerns a system for forming a long reducer made of polymeric material comprising:
An equipment for cutting the pipe to a required length;
- A conical forming member;
- A tank into which said forming member is mounted, said tank having an inlet and an outlet for a heating medium;
- An equipment for heating said heating medium; and - A cylinder piston device mounted on a stationary frame above said tank and arranged to apply a pushing force to a cut pipe placed onto the top of said conical forming member.
The system according to the invention provides a lot of advantages, e.g. the use of a heating medium preferably a liquid for heating only that portion of the exterior and interior surface of a main pipe, where the reduction is to be formed. Such a heating will enable fully controllable heating of the pipe material. The reduction is formed when the heated pipe end is pushed on the conical forming member, the top of which 2 5 has a smaller diameter than the inner diameter of the pipe to be formed to a reducer.
The pipe is pressed towards the conical forming member by means of the cylinder piston equipment pushing the other end of the pipe. Thus the main pipe will be hold in position by the conical forming member and the force of the cylinder piston device requiring no further fixture.
Jl The inlet and the outlet of the tank, which advantageously is insulated, are preferably communicating with a heating device, such as a heat exchanger having control means for maintaining a predetermined temperature of the heating medium.
In a preferred embodiment the stationary frame comprises vertical frame posts and a horizontal bar onto which said cylinder piston device is mounted. Said horizontal bar is parallel to the end surface of a pipe, which has been placed onto the top of the conical forming member.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the enclosed drawing, wherein Fig. 1 shows a schematic side view of an example of the system according to the invention;
Fig..2 shows a schematic side view of a pipe placed on the top of a conical forming member according to the invention; i Fig.3 shows a schematic section of the pipe in Fig. 2 when partially pressed down over the conical forming member;
Fig. 4 shows a schematic section of a reducer in final position of pressing;
and Fig. 5 shows a section of a formed reducer.
DETAILED DESCRIPTION OF TI-~ INVENTION
3 0 The system according to the invention for forming a reducer comprises in the dis-closed embodiment a cylindrical tank 5 provided with a conical forming member 6 at i its bottom, having a dimension and shape corresponding to the inner shape of a re-ducer to be formed. The conical .forming member 6 has preferably a cone angle in the range of 15 to 20°. The tank 5 is intended to receive a heating medium through an inlet 11 at the upper end of the tank 5 and near the bottom end of the tank 5 is an outlet 12 for said heating medium enabling the heating medium to be circulated be-5 tween a heat exchanger 2 outside the tank S and said tank 5. The heating medium is preferably an oil such as ethylene glycol or silicone. In a preferred embodiment an oil heating system or heat exchanger is used manufactured by Tool temp AG in Swit-zerland. The heating system, which is connected to an electric source, is controlled by means of a PID temperature controller. The tubes connecting the inlet I 1 and outlet 12 to the heat exchanger 2 are preferably heat insulated in order to prevent loss of heat.
The system further comprises a stationary frame with two vertical frame posts connected by a horizontal bar I, which extends diagonally above the tank 5. A
cylin-der piston device 3 is mounted on said horizontal bar l, concentrically with the cen-tral axis of the conical forming member 6. Said cylinder piston device 3 is intended to a apply a pushing force to a previously cut pipe 4, placed concentrically upon the conical forming member 6, as shown in fig. 2. For that reason the end of the piston rod of said cylinder piston device 3 is provided with a horizontal plate 8 acting at the 2 0 upper end of the pipe 4. The lower end of the pipe 4 is then sunk in a bath formed by the heating medium in the tank 5 and will thus be heated to its softening tempera-ture. When the polymeric material in the pipe wall has reached a sufficient degree of softness the cylinder piston device 3 will be activated to push the pipe downwards over the conical forming member 6 until a predetermined length of the reducer is 2 5 ~ achieved, i.e. the bottom end of the conically expanded pipe has been pushed to the bottom end of the conical forming member 6 or possibly to a predetermined level above said bottom end. DifFerent stages of the pushing operation is shown in fig. 3 and fig. 4, and in fig. 5 a ready formed reducer 9 is disclosed.
~r EXAMPLE:
When a reducer of 1000xI200 SDR 15 PE100 is to be made a pipe 4 of 1000 SDR15 is used. The lower end of the pipe 4 is heated in the bath to 140°C and by applying a pressure of 100 bar to the cylinder piston device 3. When the pipe 4 has been pushed down to a predetermined level over the conical forming member 6 the entire system is cooled. After cooling the formed reducer is taken out of the bath away from the conical forming device 6, whereby a reducer as that shown in fig. 5 is received. The upper end of the conical forming member 6 has preferably a diameter, which is 25 % smaller than the inner diameter of the pipe 4 and has, a cone angle of 20°.
ii
Claims (9)
1. Method for forming a pipe (4) of polymeric material by heating any end of said pipe (4) in a bath of a heating medium to a softening temperature of said polymeric material, forcing said end of the pipe (4) against a mould member (6), and cooling the heated pipe end formed after the mould member (6), characterized in that the pipe (4) is initially cut to a required length, one end of which being placed onto the top of a conical mould member (6) positioned in said bath of a heating medium and pushing the pipe (4), while softening, to a predetermined extent onto said mould member (6) in order to form a reducer (9) from said pipe (4), said heating medium being continuously circulated between the bath and a heating equipment (2) both during heating of the pipe (4) and during the subsequent cooling.
2. Method according to claim 1, characterized in that heated heating medium is pumped into the bath, said heating medium being arranged to heat the pipe wall both from outside and inside.
3. Method according to claim 1, characterized in that the heating medium is an oil, preferably ethylene glycol or silicone.
4. Method according to any of the preceding claims, characterized in that heating of the heating medium is stopped as soon as a predetermined dimension, of the re-duction (9) is achieved circulation of the heating medium being continued till it is cooled.
5. System for forming a pipe (4) of polymeric material, comprising a tank (5) for a heating medium and a mould member (6) against which one end of said pipe (4) is intended to be pushed, characterized in that the system further comprises an equip-ment for cutting the pipe (4) to a required length, said mould member (6) is mounted into said tank (5) and is conical for forming a reducer (9) from said pipe (4), and said tank (5) is provided with an inlet (11) and an outlet (12) for a heating medium being circulated between said tank (5) and an external heating device (2) for heating said heating medium, and a cylinder piston device (3) mounted on a stationary frame above said tank (5) and arranged to apply a pushing force to a cut pipe (4) placed onto the top of said conical mould member (6).
6. System according to claim 5, characterized in that said heating device (2) is pro-vided with control means for maintaining a predetermined temperature of the heating medium.
7. System according to claim 6, characterized in that the tank (5) is insulated.
8. System according to claim 5, characterized in that said frame comprises vertical frame posts (10) and a horizontal bar (1) to which said cylinder piston device (3) is mounted.
9. System according to claim 8, characterized in that the horizontal bar (1) is paral-lel to the end surface of a pipe (4) placed onto the top of the conical mould member (6).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20030898 | 2003-06-16 | ||
| FI20030898A FI117893B (en) | 2003-06-16 | 2003-06-16 | Method and system for forming a reduction for a pipe |
| PCT/FI2004/000369 WO2004110727A1 (en) | 2003-06-16 | 2004-06-16 | Method and system for forming a reducer for pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2529483A1 true CA2529483A1 (en) | 2004-12-23 |
Family
ID=8566260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002529483A Abandoned CA2529483A1 (en) | 2003-06-16 | 2004-06-16 | Method and system for forming a reducer for pipes |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA2529483A1 (en) |
| FI (1) | FI117893B (en) |
| MY (1) | MY138884A (en) |
| RU (1) | RU2006101229A (en) |
| WO (1) | WO2004110727A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0702601D0 (en) * | 2007-02-09 | 2007-03-21 | Airbus Uk Ltd | Method and apparatus for curing a thermosetting material |
| DE102010003139A1 (en) * | 2010-03-23 | 2011-09-29 | Robert Bosch Gmbh | Method for producing a wiper blade |
| CN110370605A (en) * | 2019-06-25 | 2019-10-25 | 湖北世纪伟业防腐科技有限公司 | Produce steel lining high density polyethylene (HDPE) flange effective flange shaping device and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3966384A (en) * | 1974-07-22 | 1976-06-29 | Maier Johann H | Machine for the thermal expansion of rigid plastic tubing |
| NL7702866A (en) * | 1977-03-16 | 1978-09-19 | Klaas Hendrik Klasema | METHOD AND DEVICE FOR FORMING A FLANGE ON A PLASTIC TUBE-SHAPED ELEMENT. |
| DE2733748A1 (en) * | 1977-07-27 | 1979-02-15 | Hoechst Ag | Fitting cover and button to body of plastics barrel - by zonal heating and cooling, and compression to form bead with aid of template and using clamping ring |
| JPH0796266B2 (en) * | 1988-06-03 | 1995-10-18 | 積水化学工業株式会社 | Method for manufacturing deformed pipe joint made of synthetic resin |
| JP2004017506A (en) * | 2002-06-18 | 2004-01-22 | Kogen Kizai Kk | Manufacturing method for trumpet-shaped sheath pipe |
-
2003
- 2003-06-16 FI FI20030898A patent/FI117893B/en active IP Right Grant
-
2004
- 2004-06-16 CA CA002529483A patent/CA2529483A1/en not_active Abandoned
- 2004-06-16 WO PCT/FI2004/000369 patent/WO2004110727A1/en active Application Filing
- 2004-06-16 MY MYPI20042317 patent/MY138884A/en unknown
- 2004-06-16 RU RU2006101229/12A patent/RU2006101229A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI117893B (en) | 2007-04-13 |
| WO2004110727B1 (en) | 2005-02-24 |
| WO2004110727A1 (en) | 2004-12-23 |
| MY138884A (en) | 2009-08-28 |
| FI20030898A0 (en) | 2003-06-16 |
| FI20030898A (en) | 2004-12-17 |
| RU2006101229A (en) | 2006-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20100616 |