WO2008011893A1 - Tête d'extrusion destinée au moulage par soufflage de corps creux ayant un système de répartition de l'épaisseur des parois de la paraison - Google Patents

Tête d'extrusion destinée au moulage par soufflage de corps creux ayant un système de répartition de l'épaisseur des parois de la paraison Download PDF

Info

Publication number
WO2008011893A1
WO2008011893A1 PCT/EP2006/007304 EP2006007304W WO2008011893A1 WO 2008011893 A1 WO2008011893 A1 WO 2008011893A1 EP 2006007304 W EP2006007304 W EP 2006007304W WO 2008011893 A1 WO2008011893 A1 WO 2008011893A1
Authority
WO
WIPO (PCT)
Prior art keywords
extrusion head
ovalizing
force plug
insert
bottom part
Prior art date
Application number
PCT/EP2006/007304
Other languages
English (en)
Inventor
Gianluca Bertolotti
Original Assignee
Uniloy Milacron S.R.L.
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 Uniloy Milacron S.R.L. filed Critical Uniloy Milacron S.R.L.
Priority to BRPI0621837A priority Critical patent/BRPI0621837B8/pt
Priority to MX2009000946A priority patent/MX2009000946A/es
Priority to CN2006800554241A priority patent/CN101500780B/zh
Priority to PCT/EP2006/007304 priority patent/WO2008011893A1/fr
Priority to JP2009521110A priority patent/JP4857380B2/ja
Publication of WO2008011893A1 publication Critical patent/WO2008011893A1/fr
Priority to ZA2009/00173A priority patent/ZA200900173B/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
    • 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

Definitions

  • the present invention relates to the sector of machines for blow moulding of polymeric materials with an extrusion head.
  • the purpose of the present invention is to eliminate the drawbacks of the known art by providing an extrusion head for blow moulding of hollow bodies that will enable a uniform distribution of the thickness in the walls of the blown piece to be guaranteed.
  • Another purpose of the invention is to provide such an extrusion head that will be extremely versatile and designed to be used for different types of production without any need for structural changes.
  • the extrusion head for blow moulding of hollow bodies comprises a body defining within it a substantially cylindrical chamber. Axially set within the chamber of the body is a force plug having a substantially cylindrical shape so as to define a cylindrical gap between the outer side surface of the male or mandrel and the inner side surface of the body, through which the molten plastic material fed by an extruder can flow.
  • a die opening is set at the bottom end of the body to define the conformation of the outer side surface of the parison.
  • a bottom part of the male is set within the die opening so as to define an annular gap communicating with the first cylindrical gap for exit of the tubular parison from the extrusion head.
  • the extrusion head further comprises a plunger supporting, at the bottom, an ovalizing insert.
  • the plunger is slidably mounted axially within a chamber formed in the bottom part of the male and open downwards. In this way, the plunger can move from a retracted, resting, position, in which the bottom edge of the ovalizing insert is located within the chamber of the bottom part of the male, to an extracted, working, position, in which the bottom edge of the ovalizing insert projects at the bottom with respect to the bottom edge of the bottom part of the male.
  • the bottom edge of the ovalizing insert that projects at the bottom from the bottom part of the male enables adjustment of the radial distribution of the internal surface of the polymer. Since the bottom edge of the ovalizing insert is asymmetrical, whereas the bottom edge of the die opening is symmetrical, there will be an appropriate distribution of the thickness of the parison, in compliance with the production requirements and the subsequent process of blow moulding in the mold.
  • Figure 1 is the layout in side elevation of a complete extrusion head according to the invention
  • Figure IA is an enlarged detail enclosed in the circle A of Figure 1;
  • Figure 2 is a plan view from beneath of the die opening of the extrusion head of Figure 1;
  • Figure 3 is an axial cross-sectional view taken according to the sectional plane III-III of
  • Figure 3 A is an enlargement of the detail enclosed in the circle A of Figure 3;
  • Figure 4 is a bottom plan view of an ovalizing insert of the extrusion head of Figure 1;
  • Figure 5 is a side view of the ovalizing insert of Figure 4;
  • Figure 5A is a side view of the ovalizing insert taken according to the direction of the arrow A of Figure 5;
  • Figure 6 is a side view of the bottom part of the head of Figure 1 , when the male of the extrusion head is in the raised, working, position and the plunger of the ovalizing insert is in the retracted, resting, position;
  • Figure 6 A is an enlargement of the detail enclosed in the circle A of Figure 6;
  • Figure 7 is an axial cross-sectional view taken according to the sectional plane VII-VII of
  • Figure 7A is an enlargement of the detail enclosed in the circle A of Figure 7;
  • Figure 8 is a side view of the bottom part of the head of Figure 1, when the male of the extrusion head is in the raised, working, position and the plunger of the ovalizing insert is in the extracted, working, position;
  • Figure 8 A is an enlargement of the detail enclosed in the circle A of Figure 8;
  • Figure 9 is an axial cross-sectional view taken according to the sectional plane IX-IX of Figure 8.
  • Figure 9A is an enlargement of the detail enclosed in the circle A of Figure 9;
  • Figure 10 is a side view of the bottom part of the head of Figure 1, when the force plug of the extrusion head is in the lowered, resting, position and the plunger of the ovalizing insert is in the retracted, resting, position;
  • Figure 1OA is an enlargement of the detail enclosed in the circle A of Figure 10;
  • Figure 1 1 is an axial cross-sectional view taken according to the sectional plane XI-XI of Figure 10; and
  • Figure 1 IA is an enlargement of the detail enclosed in the circle A of Figure 11.
  • the extrusion head 1 has a substantially cylindrical body 2.
  • a substantially cylindrical male 3 is axially set within the body 2.
  • a cylindrical gap 4 is formed, through which the molten material fed into the head by an extruder (not shown) can flow downwards through a manifold 5 set within the head.
  • the molten material in the cylindrical gap 4 assumes a substantially tubular shape.
  • the shape of the parison that must come out of the extrusion head 1 to be subsequently blown in the mold is the shape of the parison that must come out of the extrusion head 1 to be subsequently blown in the mold.
  • the die opening 6 comprises a first, cylindrical, element 7, fixed to the body 2 of the extrusion head, and a second, annular, element 8, fixed to the cylindrical element 7 by means of fixing screws that engage in respective fixing holes 9 made in the cylindrical element 7 and in the disk-like element 8 of the die opening 6.
  • a cylindrical gap 10 communicating with the cylindrical chamber 4 for passage of the molten material.
  • the cylindrical gap 10 is narrowed within the annular terminal element 8 of the die opening.
  • the annular element 8 has a tapered inner side surface 11 with an internal diameter that decreases downwards.
  • the bottom end of the terminal element 30 of the male has a tapered outer side surface 31 with an internal diameter that decreases downwards. In this way, between the two tapered surfaces 11 and 31 a narrowing 10' of the cylindrical gap 10 is created.
  • a cylindrical chamber 32 open at the bottom.
  • a plunger 20 can slide axially within the cylindrical chamber 32 of the male.
  • the plunger 20 has an axial hole 21 ending in a widened seat 22.
  • a stem 25 the bottom end of which is fixed to the plunger 20 by means of a nut 26 housed in the seat 22 of the plunger 20, passes in the axial hole 21 of the plunger 20.
  • the plunger 25 extends axially within the male 3; for said purpose, the male 3 must present an axial channel designed to enable passage of the stem 25 of the plunger.
  • the top end of the stem 25 is located in the top part of the extrusion head 1 and is connected to an actuator 26, which enables axial translation of the stem 25.
  • the actuator 26 is controlled by a purposely provided controller 27.
  • the ovalizing insert 40 Fixed to the bottom surface of the plunger 20 is an ovalizing insert 40.
  • the ovalizing insert 40 has a plurality of fixing holes 41, designed to be aligned with fixing holes of the plunger for receiving fixing screws.
  • the ovalizing insert 40 has a substantially disk-like shape, with an external diameter substantially equal to that of the plunger 20 in order to be able to slide in the chamber 32 of the male.
  • the outer bottom edge 48 of the ovalizing insert 40 has an asymmetrical profile and is divided into four portions of arc of circle 48a, 48b, 48a', 48b' subtending an angle at the centre of 90°.
  • the bottom edge 48 of the ovalizing insert 40 does not project externally with respect to the bottom edge 38 of the bottom part 30 of the male.
  • the male 3 is lifted, and the bottom part 30 of the male is within the die opening 6; consequently, the bottom edge 38 of the bottom part of the male does not project externally with respect to the bottom edge 88 of the die opening 6.
  • the molten material can pass through the narrowing 10' of the gap 10 so as to form, at output from the die opening 6, a tubular parison with substantially constant thickness, since both the bottom edge 38 of the male and the bottom edge 88 of the die opening 6 are circular and symmetrical. Consequently, no control over the thickness of the parison is performed.
  • the controller 27 ( Figure 1) controls the actuator 26, which actuates the stem 25, thus causing a translation downwards of the plunger 20.
  • the plunger 20 After said translation (see Figures 8, 8A, 9 and 9A), the plunger 20 is in its extracted, working, position, and also the bottom part 30 of the male is in the raised, working, position.
  • the bottom edge 48 of the ovalizing insert 40 projects externally downwards both with respect to the bottom edge 38 of the bottom part 30 of the male and with respect to the bottom edge 88 of the die opening 6.
  • the molten material can pass through the narrowing 10' of the gap 10; however, in this case, the internal surface of the molten material comes into contact with the outer bottom edge 48 of the ovalizing insert 40.
  • the outer bottom edge 48 of the ovalizing insert is asymmetrical and has convex portions 48a, 48a' and concave portions 48b, 48b', the internal surface of the parison at output from the die opening 6 is ovalized. As a result, the parison will have a larger thickness at the convex parts 48a, 48a' of the ovalizing insert 40 and a smaller thickness at the concave parts 48b, 48b' of the ovalizing insert.
  • the male 3 can translate axially within the head 1 to move from a raised, working, position, in which the narrowing 10' of the gap 10 is open for passage of the molten material, to a lowered, resting, position, in which the narrowing 10' of the gap 10 is closed so as to obstruct passage of the molten material outwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Tête d'extrusion (1) destinée au moulage par soufflage de corps creux comprenant : un corps (2) et un poinçon (3) placé dans le corps de façon à définir un espace cylindrique (4), dans lequel le matériau en plastique fondu fourni par une extrudeuse peut s'écouler ; une ouverture de matrice (6) placée au niveau de l'extrémité inférieure du corps (2) ; une partie inférieure (30) du poinçon (3), placée dans l'ouverture de matrice (6) de façon à définir un espace annulaire (10) communiquant avec l'espace cylindrique (4) en vue de la sortie de la paraison tubulaire ; et un piston plongeur (20) supportant en bas un insert ovale (40), monté de manière coulissante dans une chambre (32) formée dans la partie inférieure (30) du poinçon. Le piston plongeur peut passer d'une position de repos rétractée, dans laquelle le bord inférieur (48) de l'insert ovale est situé dans la chambre (32), à une position de travail extraite dans laquelle le bord inférieur (48) de l'insert ovale se projette en bas par rapport au bord inférieur (38) de la partie inférieure du poinçon.
PCT/EP2006/007304 2006-07-25 2006-07-25 Tête d'extrusion destinée au moulage par soufflage de corps creux ayant un système de répartition de l'épaisseur des parois de la paraison WO2008011893A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BRPI0621837A BRPI0621837B8 (pt) 2006-07-25 2006-07-25 cabeçote de extrusão para moldagem a sopro de corpos ocos com um sistema de distribuição da espessura das paredes da preforma e método para controlar a espessura das paredes de uma preforma
MX2009000946A MX2009000946A (es) 2006-07-25 2006-07-25 Cabeza de extrusion para moldeo por soplado de cuerpos huecos con un sistema de distribucion del espesor de las paredes de la preforma.
CN2006800554241A CN101500780B (zh) 2006-07-25 2006-07-25 具有型坯壁厚分布系统的用于中空体吹塑的挤压头
PCT/EP2006/007304 WO2008011893A1 (fr) 2006-07-25 2006-07-25 Tête d'extrusion destinée au moulage par soufflage de corps creux ayant un système de répartition de l'épaisseur des parois de la paraison
JP2009521110A JP4857380B2 (ja) 2006-07-25 2006-07-25 パリソンの壁の厚さの分布のシステムを有する、中空体のブロー成形用の押し出しヘッド
ZA2009/00173A ZA200900173B (en) 2006-07-25 2009-01-08 An extrusion head for blow moulding of hollow bodies with a system of distribution of the thickness of the walls of the parison

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/007304 WO2008011893A1 (fr) 2006-07-25 2006-07-25 Tête d'extrusion destinée au moulage par soufflage de corps creux ayant un système de répartition de l'épaisseur des parois de la paraison

Publications (1)

Publication Number Publication Date
WO2008011893A1 true WO2008011893A1 (fr) 2008-01-31

Family

ID=37943908

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/007304 WO2008011893A1 (fr) 2006-07-25 2006-07-25 Tête d'extrusion destinée au moulage par soufflage de corps creux ayant un système de répartition de l'épaisseur des parois de la paraison

Country Status (6)

Country Link
JP (1) JP4857380B2 (fr)
CN (1) CN101500780B (fr)
BR (1) BRPI0621837B8 (fr)
MX (1) MX2009000946A (fr)
WO (1) WO2008011893A1 (fr)
ZA (1) ZA200900173B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9676134B2 (en) 2011-10-21 2017-06-13 Heinz Gross Extrusion head and method for producing hollow bodies

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3468799B1 (fr) * 2016-06-14 2020-12-30 NIKE Innovate C.V. Ensembles de buses à ressort
EP3566850B1 (fr) * 2018-05-07 2021-12-15 W. Müller GmbH Tête de multi-extrusion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915691A1 (de) * 1979-04-18 1980-10-23 Takiron Co Perforiertes kunstharzrohr fuer be- und entwaesserungszwecke u.dgl., sowie verfahren zu seiner herstellung
EP0478957A1 (fr) * 1990-09-25 1992-04-08 S.T. Soffiaggio Tecnica S.r.l. Dispositif de contrôle de l'épaisseur radiale d'extrusion de polymères thermoplastiques
DE9112621U1 (de) * 1991-10-10 1992-04-09 Mauser-Werke GmbH, 5040 Brühl Extrusionseinrichtung
EP1004423A1 (fr) * 1998-11-24 2000-05-31 Harald Feuerherm Méthode et appareil pour l'extrusion-soufflage de recipients en plastique à section variable
EP1685943A2 (fr) * 2005-01-27 2006-08-02 Uniloy Milacron S.R.L. Tête d'extrusion pour moulage par soufflage d'objets creux avec système de distribution de l'épaisseur de la paroi d'une paraison

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Publication number Priority date Publication date Assignee Title
JPH06360B2 (ja) * 1986-01-29 1994-01-05 石川島播磨重工業株式会社 ブロ−成形装置
JPH0635142B2 (ja) * 1986-01-30 1994-05-11 石川島播磨重工業株式会社 ブロー成形装置
JPH06361B2 (ja) * 1986-04-24 1994-01-05 石川島播磨重工業株式会社 ブロ−成形装置のブロ−成形用ヘツド
JPH0471227A (ja) * 1990-07-11 1992-03-05 Nec Kyushu Ltd 減圧式気相成長装置
JP2795292B2 (ja) * 1991-03-28 1998-09-10 宇部興産株式会社 ブロー成形機のパリソン肉厚制御方法および装置
JPH04323021A (ja) * 1991-04-23 1992-11-12 Ube Ind Ltd ブロー成形方法および中空成形用ブローピンを有する　ブロー成形機
JPH05261795A (ja) * 1992-03-19 1993-10-12 Ishikawajima Harima Heavy Ind Co Ltd 偏平パリソン用ブロー成形機
JPH06190904A (ja) * 1992-12-25 1994-07-12 Ube Ind Ltd ブロー成形用偏平ダイス
JP2839122B2 (ja) * 1993-01-05 1998-12-16 宇部興産株式会社 ブロー成形用偏平ダイス
JP2839123B2 (ja) * 1993-01-08 1998-12-16 宇部興産株式会社 ブロー成形用偏平ダイス
JP2795367B2 (ja) * 1993-01-08 1998-09-10 宇部興産株式会社 偏平ダイスを有するブロー成形機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915691A1 (de) * 1979-04-18 1980-10-23 Takiron Co Perforiertes kunstharzrohr fuer be- und entwaesserungszwecke u.dgl., sowie verfahren zu seiner herstellung
EP0478957A1 (fr) * 1990-09-25 1992-04-08 S.T. Soffiaggio Tecnica S.r.l. Dispositif de contrôle de l'épaisseur radiale d'extrusion de polymères thermoplastiques
DE9112621U1 (de) * 1991-10-10 1992-04-09 Mauser-Werke GmbH, 5040 Brühl Extrusionseinrichtung
EP1004423A1 (fr) * 1998-11-24 2000-05-31 Harald Feuerherm Méthode et appareil pour l'extrusion-soufflage de recipients en plastique à section variable
EP1685943A2 (fr) * 2005-01-27 2006-08-02 Uniloy Milacron S.R.L. Tête d'extrusion pour moulage par soufflage d'objets creux avec système de distribution de l'épaisseur de la paroi d'une paraison

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9676134B2 (en) 2011-10-21 2017-06-13 Heinz Gross Extrusion head and method for producing hollow bodies

Also Published As

Publication number Publication date
JP4857380B2 (ja) 2012-01-18
BRPI0621837B8 (pt) 2019-02-12
MX2009000946A (es) 2009-03-23
BRPI0621837B1 (pt) 2018-01-09
CN101500780B (zh) 2012-09-12
JP2009544490A (ja) 2009-12-17
ZA200900173B (en) 2009-12-30
CN101500780A (zh) 2009-08-05
BRPI0621837A2 (pt) 2011-12-20

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