EP1156917A1 - Procede et appareil de moulage par soufflage - Google Patents

Procede et appareil de moulage par soufflage

Info

Publication number
EP1156917A1
EP1156917A1 EP99949033A EP99949033A EP1156917A1 EP 1156917 A1 EP1156917 A1 EP 1156917A1 EP 99949033 A EP99949033 A EP 99949033A EP 99949033 A EP99949033 A EP 99949033A EP 1156917 A1 EP1156917 A1 EP 1156917A1
Authority
EP
European Patent Office
Prior art keywords
regulating
regulating cavity
cavity
volume
piston
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.)
Withdrawn
Application number
EP99949033A
Other languages
German (de)
English (en)
Inventor
Kari Kirjavainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mindset Holding SA
Original Assignee
Nextrom Holding SA
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 Nextrom Holding SA filed Critical Nextrom Holding SA
Publication of EP1156917A1 publication Critical patent/EP1156917A1/fr
Withdrawn legal-status Critical Current

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
    • B29C48/33—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles with parts rotatable relative to each other
    • 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
    • B29C48/09—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
    • B29C48/03—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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons

Definitions

  • the invention relates to a method for blow moulding, in which method an annular parison is formed, the annular parison is fed into a mould and air is blown into the parison.
  • the invention further relates to a blow moulding apparatus comprising an extruder to form an annular parison, means for feeding the annular parison into a mould and means for blowing air into the parison.
  • blow moulding hollow articles, such as bottles, are manufactured.
  • an annular parison is fed into a mould and air is blown into the parison in order to produce an article whose outer surface is shaped by the mould.
  • the wall thickness of the article is determined by the width of a die opening in the blow moulding apparatus. If the wall thickness of the article needs to be varied on different sections of the article, a cone- shaped object is arranged in connection with the die, which object is moved back and forth to change the width of the flow outlet of the die.
  • the regulation of the width of the die opening affects the counterpressure of the material in the apparatus, whereby the optimal operation of the apparatus is disturbed by pressure fluctuation.
  • Said cone-shaped object cannot be applied in connection with a curved die, whereby in case of holding the mould in the vertical position preferable for the filling of the mould, the extruder of the apparatus must also be held in the vertical position, and the treatment, disassembly and cleaning of the extruder become fairly difficult.
  • the object of the present invention is to provide a method and an apparatus to avoid the above disadvantages.
  • the method of the invention is characterized by feeding material into a connecting channel to form the annular parison and there being a regulating cavity in the connecting channel, the volume of which regulating cavity is regulated in such a manner that when increasing the volume of the regulating cavity, more material is left in the regulating cavity, whereby exit flow decreases, and when decreasing the volume of the regulating cavity, more material is extruded from the apparatus, and the exit flow increases.
  • the apparatus of the invention is further characterized in that the extruder includes a connecting channel, to which material is arranged to be fed by means of feeding means and in which connecting channel there is a regulating cavity, whereby the extruder is provided with a regulating piston ar- ranged to move in a reciprocating manner to regulate the volume of the regulating cavity in such a manner that when moving the regulating piston away from the regulating cavity, the volume of the regulating cavity increases and more material is left in the regulating cavity and thus the exit flow decreases, and when pushing the regulating piston towards the regulating cavity, the volume of the regulating cavity decreases and thus more material is extruded from the apparatus.
  • the essential idea of the invention is that a connecting channel of the blow moulding apparatus, to which channel the extruder of the apparatus feeds material, is provided with a regulating cavity with a variable volume, which volume is regulated by moving the regulating piston of the apparatus back and forth.
  • a connecting channel of the blow moulding apparatus to which channel the extruder of the apparatus feeds material
  • a variable volume which volume is regulated by moving the regulating piston of the apparatus back and forth.
  • the invention provides the advantage that the amount of exit flow and preferably the thickness profile of the wall of an article to be manufactured can be regulated quickly, simply and efficiently, and in such a manner that pressure fluctuations are not produced in the extruder of the apparatus.
  • the invention also allows the use of a curved die in the apparatus, whereby the mould can be in the vertical position and yet the extruder in the horizontal position, whereby the treatment, disassembly and cleaning of the extruder are easily implemented.
  • Figure 1 shows a schematic, cross-sectional side view of an apparatus of the invention and Figures 2a and 2b show schematic, cross-sectional frontal views of alternative solutions for a regulating piston to be used in the apparatus of Figure 1.
  • Figure 1 shows a cross-sectional side view of the blow moulding apparatus of the invention.
  • the apparatus comprises an extruder 1 and a die 2 connected to the end of the extruder.
  • the material is fed as an annular parison into a mould and air is blown into it in a manner known per se to form the walls of the article into a shape determined by the mould.
  • the mould is shown schematically by broken lines.
  • the extruder 1 comprises an outer stator 3 and an inner stator 4, and as adapted between them, there are an outer rotor 5 and on its inner side, an inner rotor 6. Between the outer rotor 5 and the inner rotor 6 there may also be a central stator 7.
  • Helical grooves are adapted to the rotors and/or the stators, and when the rotors 5 and 6 are rotating, they feed the material fed between them further forwards.
  • means for feeding material between the rotors and the stators and rotating means of the rotors are not shown in the attached figure.
  • the rotors 5 and 6 and the stators 3, 4 and 7 are formed as cone-shaped at least on their facing surfaces in such a manner that feed gaps that have a shape of a convergent cone are formed between the rotors and the stators.
  • a mandrel 8 On the inner side of the inner stator 4, a mandrel 8 is also arranged. The material flows from the feed gaps shaped as convergent cones to a connecting channel 9. The end section of the connecting channel 9 forms a regulating cavity 10. Outside the mandrel 8, a regulating piston 11 is arranged. By moving the regulating piston 11 in the axial direction of the extruder 1 , the volume of the regulating cavity 10 can be regulated.
  • the wall thickness of the article to be manufactured is mainly determined by the size of a die opening 12 of the die 2.
  • the volume of the regulating cavity 10 can be increased.
  • material to be extruded by the extruder 1 accumulates in the regulating cavity, and at the same time the amount of material flowing out de- creases, and preferably by suitably regulating the simultaneously supplied air flow, which makes the wall of the article to be extruded thinner.
  • the regulating piston 11 in Figure 1 When the regulating piston 11 in Figure 1 is moved to the left, the regulating cavity 10 contracts and at the same time the regulating piston 11 extrudes the material in the regulating cavity 10 out of the apparatus, whereby the amount of material flowing out increases and preferably by suitably regulating the air flow that is supplied simultaneously, the wall of the article to be manufactured thus becomes temporarily thicker.
  • the regulating piston 11 can be made to move very fast, whereby the thickness profile of the wall of the article to be manufactured can be regulated very quickly during the process.
  • the die 2 can be made to have a curved shape so as to change the direction of the material flow. Most preferably, the direction of the material flow is turned by 90°, whereby the mould can be in the vertical direction and its filling direction is from the top to the bottom, and the extruder 1 for its part can be located in the horizontal direction.
  • the regulating piston 11 can be hydraulically moved back and forth.
  • pressure fluid is supplied through a pressure fluid channel 14 to the first pressure fluid chamber 15.
  • pressure fluid is exhausted through the second pressure fluid channel 16 from the second pressure fluid chamber 17.
  • pressure fluid flows are reversed in the opposite direction.
  • Means for supplying and controlling pressure fluids are obvious for a person skilled in the art, and for the sake of clarity they are not shown in the attached figure.
  • Rotating means 18 are adapted to the extruder 1 to rotate the regulating piston 11.
  • the rotating means 18 may comprise e.g. an electric motor rotating a cogwheel by means of an axle, whereby notches fitted to the cogwheel are adapted to the regulating piston 11 , and thus when the cogwheel is rotating, it thus rotates the regulating piston 11.
  • any other solution known per se can be used as the rotating means 18 of the regulating piston 11.
  • the centricity of all its stators 3, 4 and 7 and thus the thickness symmetry of the wall of the material to be extruded can be thermally regulated very easily.
  • Several, at least three heating elements 19, e.g. electric resistors, are adapted to each stator 3, 4 and 7 as equally distributed around the circumference of a concentric circle.
  • the heat- ing element 19 is capable of regulating the temperature of each stator section and thus of regulating the shape of the stator by utilizing heat expansion of a material. This way the centricity of the stators can be regulated in a very efficient and precise manner.
  • the regulating piston 11 has an asymmetrical cross-section.
  • the location can be moved where the regulating cavity 10 is at its largest, i.e. the wall thickness variation of the article can thus be regulated in the direction of the circumference.
  • the walls can be made in some places thinner, which thin structures form in the thicker structures of the regulating piston 11.
  • a regulating piston having a different shape has also a different kind of effect on the thickness profile when the regulating piston 11 is moved back and forth.
  • a regulating piston 11 can also be made as replaceable, whereby a different kind of regulating piston 11 is used when manufacturing different articles.
  • the regulating piston 11 can thus be adapted to the extruder 1 by means of threads, whereby the regulating piston 11 is moved back and forth by rotating, i.e. a back and forth movement and rotating can be imple- mented by one means. Further, the direction of rotation of the regulating piston 11 can be constantly changed, i.e. the regulating piston 11 may rotate in an oscillating manner. The oscillating distance may be suitably chosen and it can also be clearly shorter than a full round.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé et un appareil de moulage par soufflage. Dans l'appareil de moulage par soufflage, une extrudeuse (1) envoie de la matière dans un canal de liaison (9) de manière qu'une paraison annulaire soit formée. La paraison annulaire est envoyée dans un moule et de l'air est soufflé dans cette dernière. Le canal de liaison (9) contient une cavité de régulation (10) à volume variable régulé par le déplacement en va-et-vient d'un piston de régulation (11) de l'appareil. Lorsque le volume de la cavité de régulation (10) est augmenté, il reste plus de matière dans ladite cavité (10), le flux de sortie diminue et la paroi d'un article devient légèrement plus mince. Lorsque la cavité de régulation (10) est contractée, une quantité plus importante de matière est extrudée de l'appareil et la paroi de l'article à fabriquer s'épaissit.
EP99949033A 1998-10-12 1999-10-11 Procede et appareil de moulage par soufflage Withdrawn EP1156917A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI982216A FI107896B (fi) 1998-10-12 1998-10-12 Puhallusmuovausmenetelmä ja -laite
FI982216 1998-10-12
PCT/FI1999/000841 WO2000021730A1 (fr) 1998-10-12 1999-10-11 Procede et appareil de moulage par soufflage

Publications (1)

Publication Number Publication Date
EP1156917A1 true EP1156917A1 (fr) 2001-11-28

Family

ID=8552696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99949033A Withdrawn EP1156917A1 (fr) 1998-10-12 1999-10-11 Procede et appareil de moulage par soufflage

Country Status (8)

Country Link
EP (1) EP1156917A1 (fr)
JP (1) JP2002527257A (fr)
KR (1) KR20010075624A (fr)
CN (1) CN1323255A (fr)
AU (1) AU6205699A (fr)
FI (1) FI107896B (fr)
PL (1) PL347155A1 (fr)
WO (1) WO2000021730A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8408439B2 (en) 2007-06-22 2013-04-02 Ethicon Endo-Surgery, Inc. Surgical stapling instrument with an articulatable end effector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6926509B2 (en) 2002-05-31 2005-08-09 Ndh Medical, Inc. Apparatus for extruding tubing having a variable wall thickness

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1217187A (en) * 1968-09-09 1970-12-31 British Insulated Callenders Extrusion method and apparatus
US3819317A (en) * 1972-10-30 1974-06-25 Haskon Inc Apparatus for blow molding and injecting cooling gas
DE3809856A1 (de) * 1988-03-24 1989-10-05 Philips Patentverwaltung Blasformmaschine zum blasformen von hohlkoerpern mit wartezeitregelung
EP0535254B1 (fr) * 1991-08-08 1995-01-11 Ossberger-Turbinenfabrik Gmbh & Co. Dispositif de fabrication d'une préforme pour moulage par soufflage de soufflets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0021730A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8408439B2 (en) 2007-06-22 2013-04-02 Ethicon Endo-Surgery, Inc. Surgical stapling instrument with an articulatable end effector

Also Published As

Publication number Publication date
KR20010075624A (ko) 2001-08-09
AU6205699A (en) 2000-05-01
JP2002527257A (ja) 2002-08-27
CN1323255A (zh) 2001-11-21
FI107896B (fi) 2001-10-31
PL347155A1 (en) 2002-03-25
FI982216A (fi) 2000-04-13
FI982216A0 (fi) 1998-10-12
WO2000021730A1 (fr) 2000-04-20

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