NO761828L - - Google Patents
Info
- Publication number
- NO761828L NO761828L NO761828A NO761828A NO761828L NO 761828 L NO761828 L NO 761828L NO 761828 A NO761828 A NO 761828A NO 761828 A NO761828 A NO 761828A NO 761828 L NO761828 L NO 761828L
- Authority
- NO
- Norway
- Prior art keywords
- cooling body
- cooling
- pipe
- fan
- plastic
- Prior art date
Links
- 238000001816 cooling Methods 0.000 claims description 42
- 239000004033 plastic Substances 0.000 claims description 18
- 229920003023 plastic Polymers 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 7
- 229920001169 thermoplastic Polymers 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 2
- 239000003507 refrigerant Substances 0.000 claims 1
- 238000005496 tempering Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229920001887 crystalline plastic Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 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
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
Innretning til fremstilling av spennings-Device for the production of voltage
fattige rør av termoplastisk kunststoff. poor thermoplastic plastic pipes.
Oppfinnelsen vedrører en innretning til fremstilling av spenningsfattige rør av termoplastisk kunststoff ved kalibrering og avkjøling utenifra og ekstra indre avkjøling. The invention relates to a device for the production of low-voltage tubes of thermoplastic plastic by calibration and cooling from the outside and additional internal cooling.
Alle rør av termoplastiske kunststoffer, spesielt av delkrystallinske kunststoffer, som f.eks. høytetthets-poly-etylen og -polypropylen, består med mer eller mindre høye indre spenninger som er betinget ved fremstillingsprosessen.. Disse indre spenninger er spesielt høye ved den mest anvendte rørfrem-stillingsfremgangsmåte ved kalibrering og avkjøling av rørene utenifra. Herved oppstår på rørindresiden sprekkspenninger, på rørytresiden trykkspenninger. Spesielt ved tykkveggede rør fører disse spenninger til en nedgang i slagseighet, tidsstandforhold og sveisbarhet. Det er allerede fremlagt forslag til å nedsette disse ugunstige spenninger som f.eks. trinnvis avkjøling, mellomtemperering av rørene under produksjonen og avkjøling og kalibreringen av rørene innénifra. Disse forslag bringer enten bare en meget liten forbedring eller er i praksis vanskelig å håndtere og forårsaker ekstra produksjonsomkostninger. Den eneste metode til fullstendig fjerning av■de indre spenninger er den etterfølgende temperering av rørene over lengere tid i tempe-reringsovner. Denne metode er imidlertid meget kostbar og ikke egnet for rør viklet til ringbunter. All pipes made of thermoplastic plastics, especially semi-crystalline plastics, such as e.g. high-density polyethylene and polypropylene, consist of more or less high internal stresses that are conditioned by the manufacturing process. These internal stresses are particularly high in the most used pipe manufacturing process, when calibrating and cooling the pipes from the outside. This creates cracking stresses on the inside of the pipe, compressive stresses on the outside of the pipe. Especially in the case of thick-walled pipes, these stresses lead to a decrease in impact strength, weather conditions and weldability. Proposals have already been submitted to reduce these unfavorable tensions, such as gradual cooling, intermediate tempering of the tubes during production and cooling and calibration of the tubes from the inside. These proposals either bring only a very small improvement or are difficult to handle in practice and cause additional production costs. The only method for complete removal of the internal stresses is the subsequent tempering of the pipes over a longer period of time in tempering furnaces. However, this method is very expensive and not suitable for pipes wound into ring bundles.
Til grunn for oppfinnelsen lå den oppgave å tilveie-bringe en innretning som muliggjør å.frembringe spenningsfattige rør under unngåelse av de overnevnte ulemper. Oppgaven ble løst ved innretningen ifølge oppfinnelsen som består av en varmeiso-lert anbragt forlengelse av doren av rørverktøyet ved hjelp av et kjølelegeme. Dette kjølelegeme består av et dobbeltvegget rør av et metall av høy varmeledningsevne,ff.eks. aluminium-kobberlegeringer eller lignende. Det dobbeltveggede rørs ytre diameter er mindre enn den indre diameter av kunststoffrøret, således at det mellom de to oppstår en luftspalte. Kjølelegemets indre rom står over begge ender i forbindelse med de ytre rom. Rommet mellom veggene av kjølelegemet blir over en gjennom doren av rørsprøytehodet ført rørledning forsørget med kjølevann som tvangsføres gjennom en mellom rørveggene anbragt vendel, dessuten eventuelt i motstrøm til ekstruderingsretningen av kunststoff-røret og bortføres igjen gjennom førsprøytehodets dor. Kjøle-legemets overflate er oppruet utvendig og innvendig og formet således at absorbsjonskoeffisienten av varmestrålingen er høyest mulig, f.eks. ved polering eller sprøyting med sortlakk med matt overflate. På den indre side av det dobbeltveggede kjølelegeme befinner det seg en vifte som stadig sirkulerer luften mellom kjølelegemets indre rom og ytre rom mellom kunststoffrør og kjølelegeme således at det i spalten mellom dobbeltveggrøret og kunststoffrøret strømmer luften mot ekstrusjonsretningen. Kjølerørets ende mot sprøytehodet formes således at luftstrømmen før den har nådd sprøytehodedysen igjen suges ut i dobbeltvegg-rørets indre for å unngå en avkjøling av dysen. Den med viften frembragte sirkulasjonshastighet skal være så høy at■det utvendig og innvendig oppstår en turbulent strømning for å sikre optimal varmeoverføring. The invention was based on the task of providing a device which makes it possible to produce low-voltage pipes while avoiding the above-mentioned disadvantages. The task was solved by the device according to the invention, which consists of a heat-insulated extension of the mandrel of the pipe tool with the help of a cooling body. This heatsink consists of a double-walled tube made of a metal of high thermal conductivity, eg. aluminium-copper alloys or the like. The outer diameter of the double-walled pipe is smaller than the inner diameter of the plastic pipe, so that an air gap occurs between the two. The heatsink's inner space stands over both ends in connection with the outer spaces. The space between the walls of the cooling body is supplied with cooling water via a pipeline passed through the mandrel of the pipe sprayer head, which is forced through a vane placed between the pipe walls, also optionally in countercurrent to the extrusion direction of the plastic pipe and is carried away again through the mandrel of the pre-sprayer head. The surface of the cooling body is roughened on the outside and inside and shaped so that the absorption coefficient of the heat radiation is as high as possible, e.g. by polishing or spraying with black lacquer with a matt surface. On the inner side of the double-walled cooling body, there is a fan that constantly circulates the air between the inner space of the cooling body and the outer space between the plastic tube and the cooling body so that in the gap between the double-walled tube and the plastic tube, the air flows in the direction of extrusion. The end of the cooling pipe towards the spray head is shaped so that the air flow before it has reached the spray head nozzle is again sucked out into the interior of the double-walled pipe to avoid cooling of the nozzle. The circulation speed produced by the fan must be so high that a turbulent flow occurs externally and internally to ensure optimal heat transfer.
Til ytterligere forbedring av varmeoverføringenFor further improvement of heat transfer
kan kjølelegemet innvendig være utstyrt med lengderibber. the inside of the heatsink can be equipped with longitudinal ribs.
Oppfinnelsens gjenstand er følgelig en innretning til fremstilling av spenningsfattige kunststoffrør av termoplast, spesielt delkrystallinsk termoplast som høytetthets-polyetylen og -polypropylen ved hjelp av en kalibrering og av-kjøling utenifra og ekstra indre avkjøling, idet innretningen erkarakterisert vedat rørsprøytehodets dor over en isoleringsplate forlenges ved hjelp av et dobbeltvegget rørformet kjølehode, hvis ytre diameter er mindre enn kunstoffrørets indre diameter, The object of the invention is therefore a device for the production of low-voltage plastic tubes from thermoplastics, especially semi-crystalline thermoplastics such as high-density polyethylene and polypropylene by means of a calibration and cooling from the outside and additional internal cooling, the device being characterized by the mandrel of the pipe sprayer head being extended over an insulating plate by using a double-walled tubular cooling head, the outer diameter of which is smaller than the inner diameter of the plastic pipe,
i hulrommet mellom de to vegger av kjølehodet fører til- og bort-føringer for kjølemediet, i kjølelegemet er det anbragt en vifte, hvis strømtilførsel foregår gjennom en kabel og idet det på viften likeledes er påstukket et rørformet luftingsblikk. in the cavity between the two walls of the cooling head leads to and from leads for the cooling medium, in the cooling body there is a fan, whose power supply takes place through a cable and as the fan is also fitted with a tubular ventilation plate.
Det ifølge oppfinnelsen utformede kjølelegeme muliggjør ved strålingsabsorpsjon og konveksjon å.bortføre store varmemengder også på rørindresiden av kunststoffrøret som skal ekstruderes, uten å vanskeliggjøre den meget enkle fremstillings-metode av rørene ved kalibrering og kjøling utenifra, da kjøle- legemet ikke berører røret og heller ikke det indre kjølemedium kommer direkte i berøring med kunststoffrøret. Ved den samtidige avkjøling av kunststoffrøret innvendig og utvendig unngås best mulig dannelsen av indre spenninger. Ved riktig dimensjonering av indre og utvendig avkjøling lar det seg sogar fremstille spenningsnøytrale rør. Innretningen egner seg av plassgrunner spesielt for stordimensjonerte rør, hvor hittil ulempen med indre spenninger spesielt gjorde seg sterkt bemerkbar. The cooling body designed according to the invention makes it possible, by radiation absorption and convection, to carry away large amounts of heat also on the inside of the plastic pipe to be extruded, without complicating the very simple manufacturing method of the pipes by calibrating and cooling from the outside, as the cooling body does not touch the pipe and rather the internal coolant does not come into direct contact with the plastic pipe. By simultaneously cooling the plastic pipe inside and outside, the formation of internal stresses is best avoided. With the correct dimensioning of internal and external cooling, it is even possible to produce voltage-neutral pipes. For reasons of space, the device is particularly suitable for large-dimensioned pipes, where until now the disadvantage of internal stresses was particularly noticeable.
Spenningsfiguren viser en mulig utførelsesform av innretningen ifølge•oppfinnelsen uten dermed å være begrenset til denne. Innretning og virkningsmåte forklares nærmere i det følgende: Kunststoffrøret 1 trer ut £v rørverktøyets dyse, hvis dor 2 er forlenget ved kjølelegemet 3 ifølge oppfinnelsen. For unngåelse av varmetap av doren 2 befinner det seg mellom The voltage diagram shows a possible embodiment of the device according to the invention without being limited to this. Device and mode of action are explained in more detail in the following: The plastic pipe 1 emerges from the nozzle of the pipe tool, whose mandrel 2 is extended by the cooling body 3 according to the invention. To avoid heat loss of the mandrel 2, it is located between
dor 2 og kjølelegemet 3 en isoleringsplate 4. Kjølelegemet 3 består i det vesentlige av et dobbeltvegget rør, hvis ytre diameter er mindre enn den indre diameter av kunststoffrøret 1, således at det mellom begge består en ringformet spalte. Rommet mellom de to vegger av kjølelegemet 3 gjennomstrømmes av et kjøle-medium, vanligvis vann. Tilførsel' og bortføring av kjølemediet foregår gjennom rørledningene 5 og 6. Kjølemediet føres i hulrommet mellom de to vegger av det dobbeltveggede kjølelegeme 3 ved hjelp av et vendelformet føringsblikk 11, spiralformet motsatt ekstruderingsretningen av kunststoffrøret 1. Ved hjelp av en vifte 7 som er anbragt ved den til dysen bortvendte side av kjøle-legemet sirkuleres stadig luften mellom kjølelegemets 3 ytre og indre rom. Strømtilførselen for viftemotoren foregår gjennom en kabel 8, som på samme måte som ledningene for til- og bortføring av kjølemedium 5, 6 føres gjennom doren 2 av røreverktøyet utad. Ytelsen av viften legges således at for oppnåelse av en best• mulig varmeovergang mellom luft og kunststoffrørindreflate på mandrel 2 and the cooling body 3 an insulating plate 4. The cooling body 3 essentially consists of a double-walled tube, the outer diameter of which is smaller than the inner diameter of the plastic tube 1, so that there is an annular gap between the two. A cooling medium, usually water, flows through the space between the two walls of the cooling body 3. Supply' and removal of the coolant takes place through the pipelines 5 and 6. The coolant is fed into the cavity between the two walls of the double-walled cooling body 3 by means of a spiral-shaped guide plate 11, spirally opposite to the extrusion direction of the plastic pipe 1. By means of a fan 7 which is placed on the side of the cooling body facing away from the nozzle, the air is constantly circulated between the 3 outer and inner chambers of the cooling body. The power supply for the fan motor takes place through a cable 8, which, in the same way as the lines for the supply and removal of cooling medium 5, 6, is led through the mandrel 2 of the stirring tool to the outside. The performance of the fan is set so that, in order to achieve the best possible heat transfer between air and the plastic seed husk surface on
den ene side og den indre og ytre kjølelegemeoverflate på den annen side innenfor og utenfor kjølelegemet 3 hersker turbulent strømning. For å understøtte dette er det på viftemotoren påstukket et rørformet luftføringsblikk 10, således at luftstrøm-men i det indre rom av kjølelegemet 3 føres i en forholdsvis snever spalte dannet ved hjelp av den indre vegg av kjølelegemet 3 og luftføringsblikket 10. Den viste innretning anvendes ved ekstrudering av kunststoffrør sammen med de hittil vanlige ute- on the one hand and the inner and outer heat sink surface on the other hand inside and outside the heat sink 3 turbulent flow prevails. In order to support this, a tubular air duct 10 is attached to the fan motor, so that the air flow in the inner space of the cooling body 3 is guided in a relatively narrow gap formed by the inner wall of the cooling body 3 and the air duct 10. The device shown is used by extruding plastic tubes together with the hitherto usual external
lukkende utenifra virkende kjøle- og kalibreringsinnretninger 9>hvilket bare er vist skjematisk på figuren. cooling and calibrating devices 9>which are only shown schematically in the figure, closing from the outside.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752523975 DE2523975A1 (en) | 1975-05-30 | 1975-05-30 | DEVICE FOR MANUFACTURING LOW-TENSION PIPES FROM THERMOPLASTIC PLASTIC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO761828L true NO761828L (en) | 1976-12-01 |
Family
ID=5947804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO761828A NO761828L (en) | 1975-05-30 | 1976-05-28 |
Country Status (11)
| Country | Link |
|---|---|
| BE (1) | BE842313A (en) |
| CH (1) | CH605087A5 (en) |
| DE (1) | DE2523975A1 (en) |
| DK (1) | DK233676A (en) |
| FI (1) | FI761501A (en) |
| FR (1) | FR2312355A1 (en) |
| IT (1) | IT1081078B (en) |
| LU (1) | LU75047A1 (en) |
| NL (1) | NL7605758A (en) |
| NO (1) | NO761828L (en) |
| SE (1) | SE7606074L (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE434930B (en) * | 1982-04-29 | 1984-08-27 | Aga Ab | PROCEDURAL KIT AND DEVICE FOR COOLING EXTRADED RUBRICULAR FORMS WITH LIQUID CHOICE |
| NL8502034A (en) * | 1985-07-15 | 1987-02-02 | Leer Koninklijke Emballage | DEVICE FOR MANUFACTURING A TUBULAR ARTICLE |
| DE3903174C3 (en) * | 1989-02-03 | 1997-06-19 | Karl Veit Holger Prof Dr Ing | Internal cooling for plastic tubular film extruded from a blow head |
| DE4117221C2 (en) * | 1991-05-27 | 1996-02-22 | Schueco Int Kg | Method and device for producing extruded hollow chamber profiles from thermoplastic material |
| AT409474B (en) * | 1992-09-01 | 2002-08-26 | Greiner & Soehne C A | EXTRUSION TOOL FOR COMPONENTS PROVIDED WITH AT LEAST ONE CAVITY AND METHOD FOR PRODUCING SUCH COMPONENTS |
| US5525289A (en) * | 1995-01-30 | 1996-06-11 | Lupke; Manfred A. A. | Method and apparatus for cooling hollow molded product |
| NL1001259C2 (en) | 1995-05-03 | 1996-11-05 | Wavin Bv | Method for treating an extruded plastic profile and extrusion installation therefor. |
| FR2733934B1 (en) * | 1995-05-11 | 1997-06-20 | Corelco | COOLING DEVICE FOR CONTINUOUSLY MANUFACTURING INSTALLATION OF TUBULAR BODIES OF SYNTHETIC MATERIAL |
| BE1010116A3 (en) * | 1996-03-13 | 1998-01-06 | Eupen Kabelwerk | Method and device for cooling pipe internal plastic. |
| BE1010107A5 (en) * | 1996-03-13 | 1997-12-02 | Eupen Kabelwerk | Method and device for cooling pipe internal plastic. |
| WO1998052739A1 (en) * | 1997-05-20 | 1998-11-26 | Lupke Manfred Arno Alfred | Method and apparatus for making plastic pipe without mechanical pressure on inner pipe wall |
| AT412771B (en) * | 1997-06-26 | 2005-07-25 | Greiner & Soehne C A | EXTRUSION TOOL FOR A PLASTIC MELT |
| DE19841156C1 (en) * | 1998-09-09 | 1999-10-21 | Unicor Rohrsysteme Gmbh | Corrugated or ribbed pipe extrusion equipment with reduced cost for supplying vacuum to grooves on the cooling mandrel |
| FI20050634A (en) | 2005-06-15 | 2006-12-16 | Kwh Pipe Ab Oy | Method and apparatus for internal cooling of extruded thermoplastic tubes |
-
1975
- 1975-05-30 DE DE19752523975 patent/DE2523975A1/en active Pending
-
1976
- 1976-05-26 DK DK233676A patent/DK233676A/en unknown
- 1976-05-26 IT IT23640/76A patent/IT1081078B/en active
- 1976-05-27 FI FI761501A patent/FI761501A/fi not_active Application Discontinuation
- 1976-05-28 NO NO761828A patent/NO761828L/no unknown
- 1976-05-28 CH CH673476A patent/CH605087A5/xx not_active IP Right Cessation
- 1976-05-28 NL NL7605758A patent/NL7605758A/en not_active Application Discontinuation
- 1976-05-28 LU LU75047A patent/LU75047A1/xx unknown
- 1976-05-28 BE BE167407A patent/BE842313A/en unknown
- 1976-05-28 SE SE7606074A patent/SE7606074L/en unknown
- 1976-05-31 FR FR7616419A patent/FR2312355A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| NL7605758A (en) | 1976-12-02 |
| FR2312355A1 (en) | 1976-12-24 |
| IT1081078B (en) | 1985-05-16 |
| BE842313A (en) | 1976-09-16 |
| DE2523975A1 (en) | 1976-12-16 |
| SE7606074L (en) | 1976-12-01 |
| DK233676A (en) | 1976-12-01 |
| FI761501A (en) | 1976-12-01 |
| FR2312355B3 (en) | 1979-02-16 |
| LU75047A1 (en) | 1977-01-21 |
| CH605087A5 (en) | 1978-09-29 |
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