WO1998024611A1 - Technique et dispositif de maintien - Google Patents

Technique et dispositif de maintien Download PDF

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Publication number
WO1998024611A1
WO1998024611A1 PCT/DE1997/002142 DE9702142W WO9824611A1 WO 1998024611 A1 WO1998024611 A1 WO 1998024611A1 DE 9702142 W DE9702142 W DE 9702142W WO 9824611 A1 WO9824611 A1 WO 9824611A1
Authority
WO
WIPO (PCT)
Prior art keywords
support sleeve
mouth
molding
mouth section
support
Prior art date
Application number
PCT/DE1997/002142
Other languages
German (de)
English (en)
Inventor
Klaus Vogel
Michael Linke
Julian Choinski
Original Assignee
Krupp Corpoplast Maschinenbau Gmbh
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 Krupp Corpoplast Maschinenbau Gmbh filed Critical Krupp Corpoplast Maschinenbau Gmbh
Priority to AU46987/97A priority Critical patent/AU4698797A/en
Publication of WO1998024611A1 publication Critical patent/WO1998024611A1/fr

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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/76—Neck calibration
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C49/06—Injection blow-moulding

Definitions

  • the invention relates to a method for supporting an outer region of a mouth section of a molding during the expansion of a thermoplastic preform by applying a medium under pressure within a blow mold.
  • the invention further relates to a device for supporting an outer region of a mouth section of a molded article, which has at least one enclosing element and which is arranged in the area of a device for blow molding the molded article and encloses the mouth section of the molded article during the action of a medium under pressure .
  • Devices of this type are used to protect the mouth section of preforms made of a thermoplastic material, for example preforms made of PET (polyethylene terephthalate) within a blow molding machine in the region of a blow molding station against expansion by the action of the pressure medium. An expansion would lead to problems in the area of a downstream filling machine or when screwing closures onto the external thread of the mouth sections.
  • such a blowing machine has a heating device and a blowing device, in the area of which the pre-tempered preform is expanded into a container by biaxial orientation.
  • the expansion takes place with the aid of compressed air which is introduced into the preform to be expanded.
  • the procedural sequence for such an expansion of the preform is explained in DE-OS 43 40 291.
  • the preforms and the blown containers can be transported within the blow molding device with the aid of different handling devices.
  • the use of transport mandrels on which the preforms are attached has proven particularly useful.
  • support bodies for handling the preforms has the advantage that the preforms can be plugged with their mouth onto a coupling element of the support body and that during the further transport movements, the transport elements used only act on the support body and not directly on the preform. This prevents damage and deformation of the preform, which is soft due to the heating. In addition, material removal through direct-acting gripping elements, which could lead to dust formation, for example, is avoided.
  • the known supporting bodies in the form of transport mandrels have a high mechanical strength and, as a result, are highly reliable and have a long service life. In particular when using rotating transport devices, however, centrifugal forces occur which impair the handling speed.
  • gripping tongs for handling preforms is described, for example, in FR-OS 27 20 679.
  • a spreading mandrel that can be inserted into a mouth area of the preform for holding purposes is explained in WO 95 33 616.
  • each half of a blow mold is assigned to a half of a threaded insert, which insert portion of the molding during blowing after closing the Blow station supported on the outside.
  • a support can only be used if the preform is fed to the blow molding station in such a way that it is held by a transducer mandrel inserted into the mouth of the preform, so that the outer region of the mouth section is free.
  • This object is achieved in that a support sleeve is pushed on the outside over the mouth portion.
  • Another object of the present invention is to improve a device of the type mentioned in the introduction in such a way that the use of gripping devices acting on the outside is supported.
  • the enclosing element is designed like a sleeve and is held by a carrier which can be positioned relative to the blow mold in the direction of a longitudinal axis of the blow mold.
  • the use of the sleeve-like enclosing element prevents the thread area from widening during blowing.
  • the closed design of the enclosing element means that no additional forces are introduced into the locking of the blow mold and the carriers for holding the blow mold. Due to the lowerable arrangement of the enclosing element, the outer region of the molded article is kept clear before positioning this element in the direction of the molding, so that it can be used for intended handling Available.
  • the shaping can thus first be inserted into the blow mold by handling devices, and only after the handling element has been removed does the enclosing element become effective after being positioned in the direction of the shaping. After the blowing process has been completed, the enclosing element is removed from the area of the molding so that the finished-blown container can be removed from the blowing station.
  • Improved support can be achieved by providing the support sleeve with an undercut-free inner profile in the push-on direction.
  • Increased handling space for the shaping is particularly important if the support sleeve is lowered to perform the support function in the case of a molding positioned with its mouth in the vertical direction upward within the blow mold.
  • a simple mechanical implementation of movement processes can be achieved in that the support sleeve is pushed onto the mouth section before a blowing agent is supplied. Basically, however, it is sufficient to allow the support sleeve to take effect only above a certain blowing pressure, since low blowing pressures cannot yet lead to any deformation of the mouth section.
  • a simple mechanical construction is also supported in that the support sleeve is pushed onto the mouth section before a stretching rod is inserted into the molding. According to a possible method variant, it is also possible for the support sleeve to be pushed onto the mouth section after a stretching rod has been inserted into the molding.
  • Process time can be reduced by pushing the support sleeve onto the mouth section while a stretching rod is being inserted into the blank.
  • a particularly high support effect can be achieved in that the mouth section is supported by the support sleeve directly under an edge of a mouth opening of the molding.
  • a compact structure can be supported in that the carrier is designed as a connection element for blowing agent supply.
  • connection element can be positioned together with the support sleeve by a cam control.
  • the support sleeve is provided with a stretch rod bushing for a stretch rod.
  • a high mechanical stability in the implementation of the stretching rod is achieved in that a mouth insert arranged coaxially to the support sleeve has an inner diameter which is larger than an outer diameter of the stretching rod to form an annular gap.
  • a further improvement in the support of the mouth section can be achieved in that a distance between the mouth insert and the support sleeve essentially corresponds to a maximum wall thickness of the molding in the region of the mouth section.
  • a loss of pressurized blowing medium can be prevented by providing the mouth insert with a seal.
  • FIG. 1 is a schematic diagram of a device for blow molding when handling the moldings with the mouth oriented downward
  • FIG. 2 shows a partial representation of a molded article inserted into a blow molding station with an upwardly oriented mouth and associated encircling element and stretching device
  • FIG. 3 shows a construction modified from the embodiment in FIG. 2, in which the enclosing element is provided with an inner profile
  • Fig. 4 is an enlarged partial view of an enclosing element arranged along a mouth portion of the molded article
  • Fig. 5 is an enlarged partial illustration of a molding which is inserted into a blow molding station and which is provided with marked support areas at the mouth section.
  • the device for blow molding containers has a heating wheel (1) and a blowing wheel (2).
  • Preforms to be processed are fed via a feed rail (3) into the area of a turning device (4) and transported by transfer wheels (5,6,7) into the area of the heating wheel (1).
  • the preforms are guided hanging with their mouths oriented upwards along the feed rail (1) and rotated by 180 ° by the turning device (4).
  • Heating in the area of the heating wheel (1) takes place in such a way that the preforms are oriented upright with their mouths facing downward.
  • Heating devices (8) and cooling devices (9) are arranged along the heating wheel (1).
  • a cooling device (9) is preferably arranged between two heating devices (8).
  • the heating devices (8) heat the preforms with the aid of IR radiation and the cooling devices (9) blow air onto the surfaces of the heated preforms for surface cooling.
  • the tempered preforms are transported from a transfer wheel (10) to the blowing wheel (2) and used here in molds (11) which are held by blowing stations (12).
  • the blowing stations (12) can be opened and closed like a book.
  • the blown containers are removed from the blowing station (12) and from transfer wheels (13,6,14) an output section (15) fed.
  • the preform is heated with an upwardly oriented mouth and the preform is expanded to the final container in the area of the blowing station (12) with the mouth oriented upwards, turning devices can be dispensed with. In this way, a simplified material circulation can be achieved.
  • Fig. 2 shows a molding (16) which is arranged in the region of the blowing station (12).
  • the molding (16) is transferred from a gripping device (17) to the blowing station (12), which engages around the molding (16) in a threaded area (18).
  • the threaded area (18) is arranged between a support ring (19) and an opening (20) of the molded article (16).
  • connection element (21) is arranged above the blowing station (12), which enables a supply of blown air after a relative movement in the direction of the molding (16).
  • the connecting element (21) is designed as a connecting piston and is provided with a guide roller (22) which, by means of a cam control, positions the connecting element (21) in the direction of the molding (16) and, after the blowing process has been completed, positions it in allows an opposite direction.
  • the connection element (21) is provided in the region of its orientation facing the molded part (16) with a support sleeve (23) which has an inner diameter (24) which is approximately an outer diameter (25) of an opening section (26) of the molded part (16 ) in an environment of the threaded area (18).
  • the support sleeve (23) can have a transverse flange (27) which is used for holding in the region of the connecting element (21).
  • the connecting element (21) is equipped with an orifice insert (28) which has an outer diameter (29) which corresponds approximately to an inner diameter (30) of the molded article (16) in the region of the orifice section (26).
  • the mouth insert (28) can be provided with a bevel (31) on the outside.
  • the mouth insert (28) and the support sleeve (23) are arranged essentially coaxially to one another and to a longitudinal axis (32) of the mold.
  • the longitudinal mold axis (32) coincides with a longitudinal mold axis (33) of a molded article (16) inserted into the blowing station (12).
  • the stretching rod (25) has an outer diameter which is somewhat smaller than the inner diameter of the mouth insert (28). As a result, an annular gap is formed after the stretching rod (35) has been introduced into the molded article (36), through which blow air can be supplied.
  • the muzzle insert (28) is preferably provided on the outside with a seal (36), for example an annular seal, in order to provide sufficient gas tightness when blowing air is supplied.
  • the seal (36) can be embedded in an annular groove of the mouth insert (28). Assembly can be carried out in such a way that the mouth insert (28) extends with a mouth flange (37) between the connecting element (21) and the transverse flange (27) of the support sleeve (23).
  • the connecting element (21) is guided in a longitudinally displaceable manner in a holder (38) which carries a stop element (39) for limiting a stroke of the connecting element (21).
  • the stop element (30) engages in a form-fitting manner in a counter-profile (40) of the connection element (21), which can be designed, for example, as a groove-shaped depression.
  • the support sleeve (23) is provided with an inner profile (41).
  • the inner profile (41) is designed in such a way that on the one hand it is still possible to push the support sleeve (23) onto the mouth section (26), but on the other hand that an adaptation to an outer contour of the mouth section (26) is carried out.
  • it is intended to design the inner profile (41) as a ring-like inner thickening.
  • the support sleeve (23) abuts at several points on the mouth section (26) in the region of its inner boundary, or at least runs at a very short distance from the mouth section (26).
  • a widening of the mouth section (26) with a supply of blown air can hereby either be completely avoided or at least be kept in an area of elastic deformation of the mouth section (26). It is thus ensured that after the blowing process has ended, the outer dimensions of the mouth section (26) are within a predetermined tolerance range.
  • FIG. 5 shows possible support points (43) in the area of the mouth section (26), in the area of which support can be provided after the support sleeve (23) has been pushed on.

Landscapes

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

Abstract

Le procédé et le dispositif selon l'invention servent à maintenir la zone extérieure d'une section d'embouchure d'une ébauche, notamment lors de l'expansion d'une ébauche thermoplastique sous l'effet d'un agent sous pression à l'intérieur d'un moule de soufflage. Pour éviter un élargissement de la section d'ouverture lors de l'opération de soufflage, on pousse une douille de support par-dessus la section d'embouchure. La douille en question est maintenue par un support que l'on peut positionner par rapport au moule de soufflage dans l'axe longitudinal de ce dernier.
PCT/DE1997/002142 1996-11-30 1997-09-20 Technique et dispositif de maintien WO1998024611A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46987/97A AU4698797A (en) 1996-11-30 1997-09-20 Support technique and device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19649750.7 1996-11-30
DE19649750A DE19649750A1 (de) 1996-11-30 1996-11-30 Verfahren und Vorrichtung zur Abstützung

Publications (1)

Publication Number Publication Date
WO1998024611A1 true WO1998024611A1 (fr) 1998-06-11

Family

ID=7813275

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/002142 WO1998024611A1 (fr) 1996-11-30 1997-09-20 Technique et dispositif de maintien

Country Status (3)

Country Link
AU (1) AU4698797A (fr)
DE (1) DE19649750A1 (fr)
WO (1) WO1998024611A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007032434B4 (de) 2007-07-10 2019-08-22 Krones Aktiengesellschaft Blasvorrichtung zum Expandieren von Behältnissen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10221461B4 (de) 2002-05-15 2004-05-06 Schott Glas Vorrichtung und Verwendung einer Vorrichtung zum Aufnehmen und Vakuumabdichten eines Behältnisses mit einer Öffnung
DE10224546A1 (de) * 2002-05-24 2003-12-04 Sig Technology Ltd Verfahren und Vorrichtung zur Plasmabehandlung von Werkstücken
DE102007016029A1 (de) * 2007-03-30 2008-10-02 Sig Technology Ag Haltevorrichtung für eine CVD- oder PVD-Beschichtungsanlage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899279A (en) * 1974-08-15 1975-08-12 Phillips Petroleum Co Blow molding apparatus
JPS5836420A (ja) * 1981-08-27 1983-03-03 Yoshino Kogyosho Co Ltd 壜体成形方法
JPS5881132A (ja) * 1981-11-09 1983-05-16 Yoshino Kogyosho Co Ltd 合成樹脂製２軸延伸ブロ−成形壜体の成形方法とこの方法を実施する金型装置
JPS5884734A (ja) * 1981-11-17 1983-05-20 Yoshino Kogyosho Co Ltd ２軸延伸ブロ−成形方法
JPS592818A (ja) * 1982-06-30 1984-01-09 Katashi Aoki 延伸吹込成形方法
EP0432916A2 (fr) * 1989-11-20 1991-06-19 Aerosol Research Company (Great Britain) Limited Dispositif de moulage par injection-soufflage
DE4340291A1 (de) * 1993-11-26 1995-06-01 Krupp Corpoplast Masch Mehrfachnutzung von Blasluft
EP0734836A1 (fr) * 1994-04-28 1996-10-02 Yoshino Kogyosho Co., Ltd. Procede de moulage par soufflage a orientation biaxiale et gabarit de maintien de preforme

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1195067A (fr) * 1982-03-15 1985-10-15 Dennis L. Dundas Bague de transfert sur goulot de bouteille
FR2720681A1 (fr) * 1994-06-03 1995-12-08 Sidel Sa Tournette et machine de fabrication de récipients à partir de préformes utilisant au moins une telle tournette.
JP3777204B2 (ja) * 1994-11-11 2006-05-24 日精エー・エス・ビー機械株式会社 耐熱容器の成形装置及び成形方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899279A (en) * 1974-08-15 1975-08-12 Phillips Petroleum Co Blow molding apparatus
JPS5836420A (ja) * 1981-08-27 1983-03-03 Yoshino Kogyosho Co Ltd 壜体成形方法
JPS5881132A (ja) * 1981-11-09 1983-05-16 Yoshino Kogyosho Co Ltd 合成樹脂製２軸延伸ブロ−成形壜体の成形方法とこの方法を実施する金型装置
JPS5884734A (ja) * 1981-11-17 1983-05-20 Yoshino Kogyosho Co Ltd ２軸延伸ブロ−成形方法
JPS592818A (ja) * 1982-06-30 1984-01-09 Katashi Aoki 延伸吹込成形方法
EP0432916A2 (fr) * 1989-11-20 1991-06-19 Aerosol Research Company (Great Britain) Limited Dispositif de moulage par injection-soufflage
DE4340291A1 (de) * 1993-11-26 1995-06-01 Krupp Corpoplast Masch Mehrfachnutzung von Blasluft
EP0734836A1 (fr) * 1994-04-28 1996-10-02 Yoshino Kogyosho Co., Ltd. Procede de moulage par soufflage a orientation biaxiale et gabarit de maintien de preforme

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 116 (M - 216) 20 May 1983 (1983-05-20) *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 177 (M - 233) 5 August 1983 (1983-08-05) *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 183 (M - 235) 12 August 1983 (1983-08-12) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 087 (M - 291) 20 April 1984 (1984-04-20) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007032434B4 (de) 2007-07-10 2019-08-22 Krones Aktiengesellschaft Blasvorrichtung zum Expandieren von Behältnissen

Also Published As

Publication number Publication date
DE19649750A1 (de) 1998-06-04
AU4698797A (en) 1998-06-29

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