WO1991000798A1 - Finishing process for extruded profiles - Google Patents
Finishing process for extruded profiles Download PDFInfo
- Publication number
- WO1991000798A1 WO1991000798A1 PCT/GB1990/001087 GB9001087W WO9100798A1 WO 1991000798 A1 WO1991000798 A1 WO 1991000798A1 GB 9001087 W GB9001087 W GB 9001087W WO 9100798 A1 WO9100798 A1 WO 9100798A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plug
- pipe
- unit
- ring
- finishing unit
- Prior art date
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
- 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
- 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
- B29C48/90—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
- B29C48/903—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 externally
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/912—Cooling of hollow articles of tubular films
- B29C48/913—Cooling of hollow articles of tubular films externally
-
- 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
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0072—Roughness, e.g. anti-slip
Definitions
- This invention relates to the problem of obtaining smooth finishes on extruded plastic compositions particularly, although not confined to, thos containing discrete fibres.
- thermoplastics when thermoplastics are extruded from a die, or more of the surfaces of the extrudate while broadly conforming to the shape of the die aperture may nonetheless be subject to surface irregularities (Fig 1).
- Such irregularities in the case of extrusion for blown film are often referred to as “sharkskin” or “orange peel”, but similar surface imperfections can occur in thicker sections such as those for pipes.
- a sizing unit which has the triple function of cooling the extrudate, determining its dimensions and smoothing its surface.
- the use of either an inside sizing unit or an outside metering unit may provide an adequate finish on the unsized surface, while obtaining a high quality finish on t sized surface.
- the purpose of this invention is to provide means for obtaining a fine finish on both external and internal surfaces of extruded thermoplastic composition, particularly those containing long fibres, in a way which do not interfere with established processing methods.
- polymer processing apparatus comprising first an external or internal pip or tube sizing unit, followed respectively by an internal finishing plug external finishing ring in such a position relative to the sizing unit an at such a controlled temperature maintained by heating or cooling means, will cause the asperities or undulations on the unsized surface to flow locally to conform to the plug or ring surface.
- method of polymer processing comprising assing polymer resin, which may contain discrete fibres or fillers, through the apparatus as defined in previous paragraph, thereby obtaining smooth finishes on both inside and outside surfaces of the cooled pipe or tube.
- the first basic principle of the present invention is that sizing on the inner and outer surfaces shall take place in two forming units, consecutively placed with either outside sizing followed by inside, or vice versa. Having formed the first surface S. by pressing and cooling in the normal way, the pipe or tube (not necessarily of circular section) passed to the second forming unit. This second unit will be positioned sufficiently far downstream of the die mouth so that most of the pipe or tube will be below the melting point (T ) of the polymer matrix. If the surface S Z which is to be finished in the second forming ⁇ unit U 2 is below or only slightly above T , which is the preferred arrangement, then according to the invention heat is provided to the pipe by U .
- the purpos of this heat is to melt the polymer to a depth broadly equal tc tnat cf th asperities (Fig 5(c)) (typically 50-150 microns) and not to disturb the f of the main part of the pipe already established by the first forming uni U,.
- tc tnat cf th asperities typically 50-150 microns
- U 2 may be used to cool S-, not below T , but to a temperature somewh above T , thus establishing a surface condition similar to that described the paragraph above.
- the material of the pipe will then leave U 2 and S 2 i frozen into its smooth form by heat loss to the interior of the pipe wall described in the paragraph above.
- the second basic principle of the invention is thus that while the first formed surface S, is frozen by heat loss to the first forming unit U,, 1 wall 2 surface S ? is frozen by heat loss to the interior of the pipe ⁇ itself.
- Figure 6 shows one embodiment of the principles of the invention. This comprises die mouth D, from which issues the extruded pipe P, the materia of which may be polymer resin or polymer resin containing fillers among which may be reinforcing fibres. On emerging from D the liquid material
- S braid will be at or just be T as shown in the plug detail in Fig 7.
- the region M On leaving the plug at face F the region M immediately starts to reduce in si so that the emergent surface S 2 is frozen into the required smooth shape defined by the land L.
- the melting zone M must no significantly extend/further than the depth of the asperities, otherwise the subsequent freezing process immediately downstream of U 2 will take so long that the asperity-forming process described in Fig 5 (c) will start again.
- the required control over the penetration of heat from U 2 into the pipe is achieved by a combination of high U 2 temperatures and short land lengths L.
- FIG 8 shows an embodiment of the basic principle of this additional feature.
- a shroud G which may conveniently be in steel, consists of a hollow cylinder C, closed at one end H where it is connected to a rod or tube R which passes through the haul-off unit.
- the other end of G is open with teeth T milled or ground on to its outer surface.
- the shroud G is placed over U 2 in such a way that teeth T ar inside the die mouth D. Air pressure is delivered to A.
- po ⁇ ymer advances over the teeth T where it freezes (because G i at room temperature ⁇ . Wnen polymer is visible at the die mouth D tne haul-off is started and shroud G slides over U 2 and the air A presses the extruded polymer on to U, as previously described.
- the speed of haul-off will be such that in the finishing plug variant (Fig 6) the surface S 2 will not have cooled sufficiently from the die exit temperature (T.) and S ? will be too far a the melting temperature T .
- the rigid stem S (Fi may be replaced by a flexible tube carrying heating or cooling means to plug U 2 , such that when stretched out under the influence of the extrude pipe, the flexible tube holds the plug U 2 at the correct axial distance D to allow the heating and cooling mechanism to function as described in basic principles.
- This is mechanically the conventional floating plug configuration, the difference from normal practice being that the plug i heated and positioned to confirm with the two basic principles of the invention described above.
- There may be .circumstances where more than one finishing unit U 2 (with a plug or ring) may advantageously be used and this arrangement also falls within the scope of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB929200641A GB9200641D0 (en) | 1989-07-13 | 1992-01-13 | Finishing process for extruded profiles |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8916002.2 | 1989-07-13 | ||
GB898916002A GB8916002D0 (en) | 1989-07-13 | 1989-07-13 | Finishing process for extruded profiles |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991000798A1 true WO1991000798A1 (en) | 1991-01-24 |
Family
ID=10659956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1990/001087 WO1991000798A1 (en) | 1989-07-13 | 1990-07-13 | Finishing process for extruded profiles |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0485409A1 (en) |
AU (1) | AU6033790A (en) |
GB (2) | GB8916002D0 (en) |
WO (1) | WO1991000798A1 (en) |
ZA (1) | ZA905517B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0453647A2 (en) * | 1990-04-27 | 1991-10-30 | REHAU AG + Co | Method of manufacturing profiled elements |
WO1996023644A1 (en) * | 1995-02-01 | 1996-08-08 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
WO1999048659A1 (en) * | 1998-03-25 | 1999-09-30 | Karl Schedlbauer | Method and device for producing a profiled material |
EP2404735A1 (en) * | 2010-07-09 | 2012-01-11 | INOEX GmbH | Method and device for starting a pipe extrusion line |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2770014A (en) * | 1953-08-25 | 1956-11-13 | Itt | Sizing of thermoplastic cable cores |
GB810703A (en) * | 1956-03-22 | 1959-03-18 | Lavorazione Mat Plastiche Sas | Method and device for extruding tubes of thermoplastic materials |
FR2113928A1 (en) * | 1970-11-12 | 1972-06-30 | Dynamit Nobel Ag | |
DE2613782A1 (en) * | 1976-03-31 | 1977-10-13 | Erich Oprach | Armoured plastics hoses - with outer wall of extruded hose wound with tape under tension to embed tape in hose wall which is smoothed over whilst supported internally |
GB2055680A (en) * | 1979-08-02 | 1981-03-11 | Celanese Corp | Electrical grade extrusion filled thermoplastic sheet material and process for the manufacture thereof |
DE3216720A1 (en) * | 1982-05-05 | 1983-11-10 | Dynamit Nobel Ag, 5210 Troisdorf | Process for extruding and calibrating plastic pipes |
GB2154500A (en) * | 1984-01-24 | 1985-09-11 | Ube Nitto Kasei Co | Method of shaping a continuous rod-like molding and apparatus for shaping same |
US4764324A (en) * | 1983-12-12 | 1988-08-16 | Warren Burnham | Method of making a catheter |
-
1989
- 1989-07-13 GB GB898916002A patent/GB8916002D0/en active Pending
-
1990
- 1990-07-13 AU AU60337/90A patent/AU6033790A/en not_active Abandoned
- 1990-07-13 WO PCT/GB1990/001087 patent/WO1991000798A1/en not_active Application Discontinuation
- 1990-07-13 ZA ZA905517A patent/ZA905517B/en unknown
- 1990-07-13 EP EP90910788A patent/EP0485409A1/en not_active Withdrawn
-
1992
- 1992-01-13 GB GB929200641A patent/GB9200641D0/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2770014A (en) * | 1953-08-25 | 1956-11-13 | Itt | Sizing of thermoplastic cable cores |
GB810703A (en) * | 1956-03-22 | 1959-03-18 | Lavorazione Mat Plastiche Sas | Method and device for extruding tubes of thermoplastic materials |
FR2113928A1 (en) * | 1970-11-12 | 1972-06-30 | Dynamit Nobel Ag | |
DE2613782A1 (en) * | 1976-03-31 | 1977-10-13 | Erich Oprach | Armoured plastics hoses - with outer wall of extruded hose wound with tape under tension to embed tape in hose wall which is smoothed over whilst supported internally |
GB2055680A (en) * | 1979-08-02 | 1981-03-11 | Celanese Corp | Electrical grade extrusion filled thermoplastic sheet material and process for the manufacture thereof |
DE3216720A1 (en) * | 1982-05-05 | 1983-11-10 | Dynamit Nobel Ag, 5210 Troisdorf | Process for extruding and calibrating plastic pipes |
US4764324A (en) * | 1983-12-12 | 1988-08-16 | Warren Burnham | Method of making a catheter |
GB2154500A (en) * | 1984-01-24 | 1985-09-11 | Ube Nitto Kasei Co | Method of shaping a continuous rod-like molding and apparatus for shaping same |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN, Volume 3, No. 124 (E-144) 17 October 1979; & JP-A-54101181 (Nippon Denshin Denwa Kosha) 8 September 1979 * |
PATENT ABSTRACTS OF JAPAN, Volume 7, No. 92 (M-208)(1237) 16 April 1983; & JP-A-5816830 (Hitachi Kasei Kogyo K.K.) 31 January 1983 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0453647A2 (en) * | 1990-04-27 | 1991-10-30 | REHAU AG + Co | Method of manufacturing profiled elements |
EP0453647A3 (en) * | 1990-04-27 | 1992-01-22 | Rehau Ag + Co | Method of manufacturing profiled elements |
WO1996023644A1 (en) * | 1995-02-01 | 1996-08-08 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
NL9500182A (en) * | 1995-02-01 | 1996-09-02 | Wavin Bv | Method for producing a thermoplastic tube profile and inner cooling member for such a method. |
AU694609B2 (en) * | 1995-02-01 | 1998-07-23 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
US5911933A (en) * | 1995-02-01 | 1999-06-15 | Wavin B.V. | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method |
WO1999048659A1 (en) * | 1998-03-25 | 1999-09-30 | Karl Schedlbauer | Method and device for producing a profiled material |
EP2404735A1 (en) * | 2010-07-09 | 2012-01-11 | INOEX GmbH | Method and device for starting a pipe extrusion line |
Also Published As
Publication number | Publication date |
---|---|
GB9200641D0 (en) | 1992-03-11 |
GB8916002D0 (en) | 1989-08-31 |
EP0485409A1 (en) | 1992-05-20 |
AU6033790A (en) | 1991-02-06 |
ZA905517B (en) | 1991-04-24 |
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