WO1999050046A1 - Adjustable mandrel tube in an extruder head - Google Patents

Adjustable mandrel tube in an extruder head Download PDF

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Publication number
WO1999050046A1
WO1999050046A1 PCT/CA1999/000105 CA9900105W WO9950046A1 WO 1999050046 A1 WO1999050046 A1 WO 1999050046A1 CA 9900105 W CA9900105 W CA 9900105W WO 9950046 A1 WO9950046 A1 WO 9950046A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
adjustment
mandrel
around
transfer member
Prior art date
Application number
PCT/CA1999/000105
Other languages
French (fr)
Inventor
Manfred A. A. Lupke
Stefan A. Lupke
Original Assignee
Lupke Manfred Arno Alfred
Lupke Stefan A
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lupke Manfred Arno Alfred, Lupke Stefan A filed Critical Lupke Manfred Arno Alfred
Publication of WO1999050046A1 publication Critical patent/WO1999050046A1/en

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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B29C48/327—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections with centering 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
    • 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
    • B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
    • B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
    • 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
    • B29C48/03—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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support

Definitions

  • the present invention relates to the adjustment of the inner and outer tubes of an extruder head mandrel .
  • An extruder head mandrel which is used in a mold for forming double walled plastic pipe has inner and outer tubes spaced outwardly around a centering or holding tube for the mandrel . Each of the tubes is spaced from one another to provide plastic flow paths between the inner tube and the centering tube and also between the outer tube and the inner tube.
  • the present invention provides a mandrel system of an extruder head comprising a centering tube and inner and outer tubes outwardly around the centering tube.
  • the system further includes an adjustment assembly for adjusting spacing between the tubes.
  • the adjustment assembly has first adjustment means which provides simultaneous corresponding adjustment of the inner and outer tubes and second - 2 -
  • adjustment means which provides adjustment of the outer tube independently of the inner tube.
  • the inner and outer tubes are properly aligned with one another but not properly aligned with the centering tube, only a single adjustment is necessary through the first adjustment means. If the outer tube is the only tube out of alignment, then only a single adjustment is necessary through the second adjustment means. If both the inner and outer tubes are out of alignment, then the inner tube can be adjusted through the first adjustment means and the outer tube can be separately adjusted through the second adjustment means .
  • Figure 1 is a schematic view of a pipe molding apparatus having an extruder with a mandrel assembly according to a preferred embodiment of the present invention
  • Figure 2 is an enlarged sectional view through the upstream end of the mandrel assembly from the extruder head of Figure 1.
  • FIG. 1 shows a pipe molding apparatus generally indicated at 1.
  • This pipe molding apparatus has an upstream end extruder 3 which feeds plastic in a downstream direction through an extruder head mandrel 5 to a pipe molding region generally indicated at 11.
  • This pipe molding region comprises first and second sets of mold block sections 13 and 15 which travel around endless loops as is known in the art to form a moving mold tunnel. Double walled pipe 17 emerges from the downstream end of the moving mold tunnel.
  • the mandrel 5 has first and second plastic stream outlets 7 and 9 located within the moving mold tunnel to form the inner and outer walls of the double walled pipe.
  • FIG. 2 of the drawings shows that mandrel 5 includes a central tube 21 and inner and outer tubes 23 and 25 spaced outwardly around the center tube.
  • a first path 27 is provided between the center tube 21 and the inner tube 23 and a second path 29 is provided between the inner tube 23 and the outer tube 25.
  • An air passage 24 is provided interiorly of and along inner tube 23. This passage provides a path for a flow of pressurized air internally of the outer wall forming stream of plastic to assist it onto the mold block faces as is known in the art.
  • the present invention provides a tube adjustment assembly generally indicated at 31 for an - 4 -
  • Figure 2 only shows a single adjustment assembly, a plurality of these are provided, preferably equally spaced, around the mandrel.
  • adjustment assembly 31 comprises a first adjustment member 33 and a second adjustment 35. It additionally includes a specifically designed adjustment transfer member comprising a first collar portion 39 which wraps around the upstream end of the inner tube and a second collar portion 41 which wraps around the upstream end of the outer tube which is stepped relative to the upstream end of the inner tube.
  • Adjustment member 33 which is in the form of a bolt, is threaded through a fixed support portion 37 of the mandrel to act on collar portion 39.
  • Adjustment member 35 again in the form of a bolt is threaded through collar portion 41. Adjustment member 35 acts on a further collar portion 36 around the outer tube.
  • a gap 43 is provided between fixed support 37 and collar portion 39 and a gap 45 is provided between collar portion 41 and collar portion 36. The inner and outer pipes are movable within these gaps.
  • Adjustment of adjustment member 33 to act on collar portion 39 produces movement of inner tube 23 to enable this tube be properly aligned with the centering tube. This also produces a simultaneous corresponding adjustment of outer tube 25 because of the one piece construction of adjustment transfer member formed by the two collar portions 39 and 41. Therefore, if the inner and outer tubes are properly aligned with one another, but out of alignment with the centering tube, only a single adjustment through adjustment member 33 is required. If however, outer tube 25 remains out of alignment or is the only tube out of alignment, it is adjusted independently of the inner tube through adjustment member 35.
  • This adjustment member acts on collar 36 to move the outer tube relative to the centering tube without moving the inner tube.
  • adjustment bolts will be advanced to push on the tubes while in other assemblies, the bolts will have to be backed off to provide space for the movement of the tubes by the advancing bolts to the centered position.

Abstract

An extruder head has a mandrel (5) with a centering tube (21) and inner (23) and outer (25) tubes outwardly around the centering tube (21). An adjustment assembly is provided for adjusting spacing between the tubes. The adjustment assembly has a first adjustment member (33) which provides simultaneous corresponding adjustment of the inner (23) and outer tubes (25) and a second adjustment member (35) which provides adjustment of the outer tube (25) independently of the inner tube (23).

Description

ADJUSTABLE MANDREL TUBE IN AN EXTRUDER HEAD
FIELD OF THE INVENTION
The present invention relates to the adjustment of the inner and outer tubes of an extruder head mandrel .
BACKGROUND OF THE INVENTION An extruder head mandrel, which is used in a mold for forming double walled plastic pipe has inner and outer tubes spaced outwardly around a centering or holding tube for the mandrel . Each of the tubes is spaced from one another to provide plastic flow paths between the inner tube and the centering tube and also between the outer tube and the inner tube.
It is critical that the gap of each plastic flow path be consistent completely around the mandrel head to ensure uniform thickness of the inner and outer walls of the plastic pipe. Accordingly, if the inner and outer tubes are not properly centered around the holding tube, adjustments need to be provided for proper alignment of the inner and outer tubes within the extruder head mandrel.
SUMMARY OF THE INVENTION
The present invention provides a mandrel system of an extruder head comprising a centering tube and inner and outer tubes outwardly around the centering tube. The system further includes an adjustment assembly for adjusting spacing between the tubes. The adjustment assembly has first adjustment means which provides simultaneous corresponding adjustment of the inner and outer tubes and second - 2 -
adjustment means which provides adjustment of the outer tube independently of the inner tube.
According to the present invention, if the inner and outer tubes are properly aligned with one another but not properly aligned with the centering tube, only a single adjustment is necessary through the first adjustment means. If the outer tube is the only tube out of alignment, then only a single adjustment is necessary through the second adjustment means. If both the inner and outer tubes are out of alignment, then the inner tube can be adjusted through the first adjustment means and the outer tube can be separately adjusted through the second adjustment means .
BRIEF DESCRIPTION OF THE DRAWINGS
The above as well as other advantages and features of the present invention will be described in greater detail according to the preferred embodiments of the present invention in which;
Figure 1 is a schematic view of a pipe molding apparatus having an extruder with a mandrel assembly according to a preferred embodiment of the present invention;
Figure 2 is an enlarged sectional view through the upstream end of the mandrel assembly from the extruder head of Figure 1.
DETAILED DESCRIPTION ACCORDING TO THE PREFERRED EMBODIMENTS OF THE PRESENT INVENTION
Figure 1 shows a pipe molding apparatus generally indicated at 1. This pipe molding apparatus has an upstream end extruder 3 which feeds plastic in a downstream direction through an extruder head mandrel 5 to a pipe molding region generally indicated at 11. This pipe molding region, according to the embodiment shown, comprises first and second sets of mold block sections 13 and 15 which travel around endless loops as is known in the art to form a moving mold tunnel. Double walled pipe 17 emerges from the downstream end of the moving mold tunnel.
The mandrel 5 has first and second plastic stream outlets 7 and 9 located within the moving mold tunnel to form the inner and outer walls of the double walled pipe.
Figure 2 of the drawings shows that mandrel 5 includes a central tube 21 and inner and outer tubes 23 and 25 spaced outwardly around the center tube. A first path 27 is provided between the center tube 21 and the inner tube 23 and a second path 29 is provided between the inner tube 23 and the outer tube 25. These two paths feed molten plastic from the extruder 3 through the mandrel 5 to the two plastic outlets from the mandrel into the mold tunnel .
An air passage 24 is provided interiorly of and along inner tube 23. This passage provides a path for a flow of pressurized air internally of the outer wall forming stream of plastic to assist it onto the mold block faces as is known in the art.
When setting the mandrel up, e.g. following maintenance or the like, it is important that all of the tubes be centered relative to one another to ensure consistent thickness of the plastic in both of the plastic flow paths completely around the mandrel.
The present invention provides a tube adjustment assembly generally indicated at 31 for an - 4 -
easy adjustment of the inner and outer tubes relative to the centering tube. It is to be understood that although Figure 2 only shows a single adjustment assembly, a plurality of these are provided, preferably equally spaced, around the mandrel.
More particularly, adjustment assembly 31 comprises a first adjustment member 33 and a second adjustment 35. It additionally includes a specifically designed adjustment transfer member comprising a first collar portion 39 which wraps around the upstream end of the inner tube and a second collar portion 41 which wraps around the upstream end of the outer tube which is stepped relative to the upstream end of the inner tube. Adjustment member 33, which is in the form of a bolt, is threaded through a fixed support portion 37 of the mandrel to act on collar portion 39. Adjustment member 35 again in the form of a bolt is threaded through collar portion 41. Adjustment member 35 acts on a further collar portion 36 around the outer tube. A gap 43 is provided between fixed support 37 and collar portion 39 and a gap 45 is provided between collar portion 41 and collar portion 36. The inner and outer pipes are movable within these gaps.
Adjustment of adjustment member 33 to act on collar portion 39 produces movement of inner tube 23 to enable this tube be properly aligned with the centering tube. This also produces a simultaneous corresponding adjustment of outer tube 25 because of the one piece construction of adjustment transfer member formed by the two collar portions 39 and 41. Therefore, if the inner and outer tubes are properly aligned with one another, but out of alignment with the centering tube, only a single adjustment through adjustment member 33 is required. If however, outer tube 25 remains out of alignment or is the only tube out of alignment, it is adjusted independently of the inner tube through adjustment member 35. This adjustment member, as noted above, acts on collar 36 to move the outer tube relative to the centering tube without moving the inner tube.
As again will be understood, adjustments will be required at each of the adjustment assemblies around the mandrel in order to properly center the tubes. In some of the assemblies, the adjustment bolts will be advanced to push on the tubes while in other assemblies, the bolts will have to be backed off to provide space for the movement of the tubes by the advancing bolts to the centered position.
It will now be seen from the above, how the inner and outer tubes, if in alignment with one another, can be simultaneously aligned with the centering tube, how the inner and outer tubes can both be adjusted relative to the centering tube, or how only the outer tube can be adjusted relative to the centering tube.
Although various preferred embodiments of the present invention have been described in detail, it will be appreciated by those skilled in the art, that variations may be made without departing from the spirit of the invention or the scope of the appended claims .

Claims

- 6 -THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS :
1. A mandrel system of an extruder head, said system comprising a centering tube and inner and outer tubes, the inner tube being spaced by a first plastic flow path outwardly around the centering tube and the outer tube being spaced by a second plastic flow path outwardly around the inner tube, and an adjustment assembly having first adjustment means which provides simultaneous corresponding adjustment of said inner and outer tubes relative to said centering tube and second adjustment means which provides adjustment of said outer tube independently of said inner tube .
2. A mandrel of an extruder head, said mandrel having a central tube, a first tube outwardly around said central tube and spaced therefrom by a first plastic flow path, a second tube outwardly around said first tube and spaced therefrom by a second plastic flow path and a plurality of adjustment assemblies around said mandrel for adjusting positioning of said first and second tubes, each adjustment assembly comprising first and second adjustment members and an adjustment transfer member, said first adjustment member acting on said adjustment transfer member which in turn acts on said first tube for adjustment thereof, said second adjustment member being mounted in said adjustment transfer member and acting on said second tube such that any adjustment of said first tube produces a simultaneous corresponding adjustment of said second tube, and said second adjustment member being adjustable relative to said adjustment transfer member for adjustment of said second tube independently of said first tube. - 7 -
3. A mandrel as claimed in Claim 2 , wherein said second tube has an end which is stepped relative to said first tube and wherein said adjustment transfer member comprises a stepped collar having a first collar portion around said first tube and a second larger collar portion around the end of said second tube.
4. A mandrel as claimed in Claim 3 , wherein said first adjustment member is threaded through a fixed support on said mandrel to said first collar portion and second adjustment member is threaded through said second collar portion of said adjustment transfer member .
PCT/CA1999/000105 1998-03-31 1999-02-05 Adjustable mandrel tube in an extruder head WO1999050046A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5092398A 1998-03-31 1998-03-31
US09/050,923 1998-03-31

Publications (1)

Publication Number Publication Date
WO1999050046A1 true WO1999050046A1 (en) 1999-10-07

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PCT/CA1999/000105 WO1999050046A1 (en) 1998-03-31 1999-02-05 Adjustable mandrel tube in an extruder head

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WO (1) WO1999050046A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219221A1 (en) 2015-10-06 2017-04-06 Ralph Peter Hegler Spray head for a device for producing a composite pipe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111231261A (en) * 2020-01-21 2020-06-05 瑞瑶环境科技有限公司 Integrally-formed carat pipe, forming die and production process thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363716A2 (en) * 1988-10-11 1990-04-18 Manfred Arno Alfred Lupke Extrusion die assembly
DE4010404A1 (en) * 1989-04-06 1990-10-11 Manfred Arno Alfred Lupke Plastic twin-wall hose - extruded with air gap between inner and outer walls
US5124109A (en) * 1984-07-18 1992-06-23 Contech Construction Products Inc. Method for producing a double wall pipe
WO1994009964A1 (en) * 1992-10-30 1994-05-11 Lupke Manfred Arno Alfred Extrusion equipment having means for adjusting a delivery end of a die with respect to the extruder for alignment with downstream equipment
EP0726134A1 (en) * 1995-02-13 1996-08-14 Wilhelm Hegler Method and apparatus for producing a thermoplastic multi layer pipe, especially from polyolefin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124109A (en) * 1984-07-18 1992-06-23 Contech Construction Products Inc. Method for producing a double wall pipe
EP0363716A2 (en) * 1988-10-11 1990-04-18 Manfred Arno Alfred Lupke Extrusion die assembly
DE4010404A1 (en) * 1989-04-06 1990-10-11 Manfred Arno Alfred Lupke Plastic twin-wall hose - extruded with air gap between inner and outer walls
WO1994009964A1 (en) * 1992-10-30 1994-05-11 Lupke Manfred Arno Alfred Extrusion equipment having means for adjusting a delivery end of a die with respect to the extruder for alignment with downstream equipment
EP0726134A1 (en) * 1995-02-13 1996-08-14 Wilhelm Hegler Method and apparatus for producing a thermoplastic multi layer pipe, especially from polyolefin

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219221A1 (en) 2015-10-06 2017-04-06 Ralph Peter Hegler Spray head for a device for producing a composite pipe
EP3153296A1 (en) 2015-10-06 2017-04-12 Ralph Peter Hegler Extrusion head for a device for producing a composite pipe
US10583596B2 (en) 2015-10-06 2020-03-10 Ralph Peter Hegler Injection head for an apparatus for the production of a twin-wall pipe

Also Published As

Publication number Publication date
DE29810320U1 (en) 1998-09-17

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