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WO2008101468A2 - Procédé et dispositif de moulage de récipients par soufflage - Google Patents

Procédé et dispositif de moulage de récipients par soufflage Download PDF

Info

Publication number
WO2008101468A2
WO2008101468A2 PCT/DE2008/000259 DE2008000259W WO2008101468A2 WO 2008101468 A2 WO2008101468 A2 WO 2008101468A2 DE 2008000259 W DE2008000259 W DE 2008000259W WO 2008101468 A2 WO2008101468 A2 WO 2008101468A2
Authority
WO
WIPO (PCT)
Prior art keywords
sealing element
blowing
preform
preforms
curvature
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.)
Ceased
Application number
PCT/DE2008/000259
Other languages
German (de)
English (en)
Other versions
WO2008101468A3 (fr
Inventor
Michael Litzenberg
Michael Linke
Rolf Baumgarte
Frank Lewin
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.)
SIG Services AG
KHS GmbH
Original Assignee
SIG Technology AG
KHS Corpoplast 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 SIG Technology AG, KHS Corpoplast GmbH filed Critical SIG Technology AG
Publication of WO2008101468A2 publication Critical patent/WO2008101468A2/fr
Publication of WO2008101468A3 publication Critical patent/WO2008101468A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • B29C49/58—Blowing 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
    • 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
    • B29C2049/4294—Sealing 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
    • 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 blow-molding of containers, are heated in the preforms of a thermoplastic material in the region of a heating section and then transferred to a blowing device in which the preforms are transformed by the action of a blowing pressure within blow molding to the containers.
  • the invention further relates to a device for blow-molding of containers, which has a heating section for heating preforms of a thermoplastic material and which is provided with a blowing device having at least one blowing station for forming the preforms in the container.
  • preforms made of a thermoplastic material for example preforms made of PET (polyethylene terephthalate) are distinguished within a blow molding machine. lent processing stations supplied. Typically, such a blow molding machine has a heating device and a blowing device, in the region of which the previously tempered preform is expanded by biaxial orientation to form a container. The expansion takes place by means of compressed air, which is introduced into the preform to be expanded.
  • the procedural sequence in such an expansion of the preform is explained in DE-OS 43 40 291.
  • the introductory mentioned introduction of the pressurized gas also includes the introduction of compressed gas into the developing container bubble and the introduction of compressed gas into the preform at the beginning of the. Blowing process.
  • the preforms as well as the blown containers can be transported by means of different handling devices.
  • the use of transport mandrels, onto which the preforms are plugged, has proven to be useful.
  • the preforms can also be handled with other support devices.
  • the use of gripping tongs for handling preforms and the use of expanding mandrels which can be inserted into a mouth region of the preform for holding are likewise among the available constructions.
  • a handling of containers using transfer wheels is described for example in DE-OS 199 06 438 described in an arrangement of the transfer wheel between a blowing wheel and an output path.
  • blow molding stations different embodiments are known.
  • blow stations which are arranged on rotating transport wheels, a book-like Aufklappbarke.it the mold carrier is often encountered. But it is also possible to use relatively movable or differently guided mold carrier.
  • fixed blowing stations which are particularly suitable for receiving a plurality of cavities for container molding, typically plates arranged parallel to one another are used as mold carriers.
  • the interior of the preforms is provided with a considerable internal pressure to perform the blowing process.
  • a thread area of the preform also deforms, since otherwise the accuracy of fitting of caps used to close the containers would be impaired.
  • an external sealing of the preform is known so that there is a substantially equal pressure on both sides of the threaded portion.
  • the threaded portion of the preform is typically surrounded by a compensation space, which is sealed against a support ring of the preform.
  • the object of the present invention is therefore to improve a method of the initially mentioned type such that a high operational reliability is achieved with a simple mechanical construction.
  • This object is achieved in that in the region of the blowing device, a sealing element is guided against a support ring of the preform and that the sealing element is initially biased after contact with the support ring mechanically against the support ring and then pneumatically further tensioned.
  • a further object of the present invention is to configure a device of the type mentioned in the introduction in such a way that structure that with a simple design effort a high operational reliability is supported.
  • This object is achieved in that extends a sealing element for sealing the preform in the region of a mouth portion of the preform surrounding the expansion space starting from a stop of a connecting element in the direction of Einfuel ⁇ réelle of the connecting element and has at least one bulge region extending into a support surface the connecting element opposite direction extends.
  • a sealing element which is mechanically biased and then pneumatically further tensioned, it is possible to make both a gentle and extremely reliable sealing of the preform.
  • the mechanical bias of the sealing element provides sufficient tightness to allow in a second process step, a pneumatic further tension of the seal.
  • the pneumatic clamping makes it possible in particular to increase with increasing pressure to be sealed and the sealing tension of the sealing element.
  • a defined deformation of the sealing element in carrying out the pre-stressing is achieved in that the sealing element during the pretensioning in the region of a ner vault is provided with an increasing curvature.
  • Carrying on the re-tensioning without using a separate control gas is made possible by performing the re-tensioning by the action of the pressurized blast gas.
  • a simple performance of the further tensioning is achieved in that the further tensioning is carried out by a pressure of the blowing gas on the curvature.
  • a build-up of counterforce can be avoided by venting a cavity behind the camber during deformation of the camber.
  • a precise alignment of the components used relative to each other is achieved in that the preform is aligned by a concentric with the sealing element arranged centering.
  • a defined deformation of the sealing element is supported by the fact that a cavity is arranged behind the curvature.
  • the cavity is connected by a venting recess with an environment. Performing the alignment of the components relative to each other is assisted in that the connection element has a centering element.
  • a uniform pressure relief of the threaded portion is achieved in that the receiving space extends substantially centrally to a longitudinal axis of the connecting element.
  • the connecting element has an outer element formed of plastic and an insert formed of metal.
  • the sealing element is formed of an elastomer.
  • FIG. 1 is a perspective view of a blow molding station for the production of containers from preforms
  • FIG. 2 shows a longitudinal section through a blow mold, in which a preform is stretched and expanded, - O -
  • FIG. 3 shows a sketch to illustrate a basic structure of a device for blow-molding containers
  • Fig. 5 is a side view of a connecting element used in the blowing station and
  • FIG. 1 The basic structure of a device for forming preforms (1) in container (2) is shown in FIG. 1 and in FIG. 2.
  • the device for forming the container (2) consists essentially of a blowing station (3), which is provided with a blow mold (4) into which a preform (1) can be inserted.
  • the preform (1) may be an injection-molded part of polyethylene terephthalate.
  • the blow mold (4) consists of mold halves (5, 6) and a bottom part (7) made of a lifting device (8) is positionable.
  • the preform (1) can be held in the region of the blowing station (3) by a transport mandrel (9) which, together with the preform (1), passes through a plurality of treatment stations within the device.
  • preform (1) for example via pliers or other handling means directly into the blow mold (4).
  • a connecting piston (10) is arranged, which feeds the preform (1) compressed air and at the same time makes a seal relative to the transport mandrel (9).
  • solid compressed air supply lines it is basically also conceivable to use solid compressed air supply lines.
  • a stretching of the preform (1) takes place in this embodiment by means of a stretching rod (11), which is positioned by a cylinder (12).
  • a mechanical positioning of the stretch rod (11) is carried out over curve segments, which are acted upon by Abgriff rollers.
  • the use of curve segments is particularly useful when a plurality of blowing stations (3) are arranged on a rotating blowing wheel
  • the stretching system is designed such that a tandem arrangement of two cylinders (12) is provided. From a primary cylinder (13), the stretch rod (11) is first moved to the area of a bottom (14) of the preform (1) before the beginning of the actual stretching operation.
  • the primary cylinder (13) with extended stretching rod together with a carriage (15) carrying the primary cylinder (13) is positioned by a secondary cylinder (16) or via a cam control.
  • the secondary cylinder (16) in such a cam-controlled manner that a current stretching position is predetermined by a guide roller (17) which slides along a curved path during the execution of the stretching operation.
  • the guide roller (17) is pressed against the guideway by the secondary cylinder (16).
  • the carriage (15) slides along two guide elements (18).
  • the carriers (19, 20) are locked relative to one another by means of a locking device (20).
  • Fig. 2 shows in addition to the blown container (2) and dashed lines drawn the preform (1) and schematically a developing container bladder (23).
  • Fig. 3 shows the basic structure of a blow molding machine, which is provided with a heating section (24) and a rotating blowing wheel (25). Starting from a preform input (26), the preforms become
  • radiant heaters (30) and blowers (31) are arranged to temper the preforms (1). After a sufficient temperature control of the preforms (1), they are transferred to the blowing wheel (25), in the region of which the blowing stations (3) are arranged. The finished blown containers (2) are fed by further transfer wheels to a delivery line (32).
  • thermoplastic material different plastics can be used.
  • PET, PEN or PP can be used.
  • the expansion of the preform (1) during the orientation process takes place by compressed air supply.
  • the compressed air supply is in a pre-blowing phase in which gas, for example compressed air, is supplied at a low pressure level and subdivided into a subsequent main blowing phase in which gas at a higher pressure level is supplied.
  • gas for example compressed air
  • main blowing phase in which gas at a higher pressure level is supplied.
  • compressed air is typically used at a pressure in the interval of 10 bar to 25 bar and during the main blowing phase compressed air is supplied at a pressure in the interval of 25 bar to 40 bar.
  • the heating section (24) from a plurality of revolving transport elements (33) is formed, which are strung together like a chain and guided by guide wheels (34).
  • guide wheels (34) In particular, it is envisaged to open a substantially rectangular basic contour by the chain-like arrangement.
  • any other guides are conceivable.
  • the arrangement shown to be particularly useful since in the region of the corresponding extent of the heating section (24) three deflecting wheels (34, 36) are positioned, and although in each case the smaller deflection wheels (36) in the region of the transition to the linear curves of the heating section (24) and the larger deflection wheel (34) in the immediate transfer area to the transfer wheel (29) and the input wheel (35).
  • chain-like transport elements (33) it is also possible, for example, to use a rotating heating wheel.
  • the fans (31) introduce cooling air into the region of cooling air ducts (39), which in each case oppose the associated radiant heaters (30) and emit the cooling air via outflow openings. Due to the arrangement of the outflow directions, a flow direction for the cooling air is essentially transverse to a transport direction of the preforming device. Lingen (1) realized.
  • the cooling air ducts (39) can provide reflectors for the heating radiation in the area opposite the radiant heaters (30), and it is likewise possible to realize cooling of the radiant heaters (30) via the discharged cooling air.
  • Fig. 5 shows a connection element (41) for use in the region of the blowing station (3).
  • the connecting element (41) can be designed as part of the connecting piston (10) or as a separate component.
  • the connection element (41) serves to supply the blown gas into the region of the preform (1) in order to convert it to the container (2) and, after the corresponding container molding, to discharge the blown gas.
  • the connection element (41) can be introduced into the area of the blow mold (4) with an outer element (42) or can adjoin the blow mold (4) with a contact surface (43).
  • Fig. 6 shows a longitudinal section through the connecting element (41) according to FIG. 5.
  • the outer element (42) is connected to an insert (44) extending from the outer element
  • seal (45) which is provided for sealing against a support member.
  • the seal (45) is preferably arranged on the outside of the insert (44) and may be formed as an O-ring.
  • Fig. 6 shows the mouth portion (21) of a preform (1) which is surrounded by the outer member (42).
  • a nozzle-shaped Zen- trierelement (46) of the connecting element (41) introduced in the mouth portion (21) is a nozzle-shaped Zen- trierelement (46) of the connecting element (41) introduced.
  • the centering element (46) is designed here as an extension of the insert (44).
  • An outer diameter of the centering element (46) substantially corresponds to an inner diameter of the mouth section (21).
  • a receiving space (47) into which the mouth portion (21) is inserted.
  • a sealing element (49) which is formed substantially sleeve-like and centrally to a longitudinal axis (50) of the connecting element (41).
  • the sealing element (49) has a holding segment (51) which is fixed in the region of the connecting element (41).
  • the support segment (51) in the region of a transition of the insert (44) in the outer member (42) is arranged, since in a simple manner, a positive retention can be provided.
  • the sealing element (49) adjoins a support ring (52) of the preform (1) in the region of its extension facing away from the support segment (51) and seals the receiving space (47) against an environment by mechanical compression.
  • the sealing element (49) is designed such that in at least one region a curvature (53) is provided, which extends from the support surface (46) into the receiving space (47). Typically, the bulge (53) is annular and concentric with the longitudinal axis (50). Between the curvature (53) and the contact surface (48), a cavity (54) is arranged, the by at least one venting recess (55) is connected to an environment.
  • the venting recess is designed such that in at least one region a curvature (53) is provided, which extends from the support surface (46) into the receiving space (47).
  • the bulge (53) is annular and concentric with the longitudinal axis (50).
  • a cavity (54) is arranged, the by at least one venting recess (55) is connected to an environment.
  • venting recess extends through the outer member (42) therethrough.
  • the venting recess extends
  • the receiving space (47) is also connected via at least one connecting channel (56) with an inner space (57) of the connecting element (41).
  • the connecting channel (56) is in this case arranged such that it extends above the preform (1).
  • the connecting channel (56) also extends in a radial direction relative to the longitudinal axis (50).
  • the outer member (42) and the insert (44) are connected to each other by screws (58).
  • An assembly can for example be such that first the sealing element (49) in the outer member (42) is inserted and with a projection (59) on a step (60) of the outer element (42) is supported. Subsequently, the insert (44) is connected to the outer element (42) and in this case braces the sealing element (49) with its holding segment (51) between the step (60) and a contact surface (61) of the insert (44).
  • the outer element (42) is preferably formed from a plastic.
  • the insert (44) is preferably made of metal, for example a chromium-nickel steel.
  • the material for the sealing element (49) proves the use of an elastomer as advantageous.
  • the connecting element (41) is then lowered and guided with its contact surface (43) against the blow mold (4).
  • the centering element (46) is inserted into the mouth section (21) of the preform (1) and centers the preform (1).
  • An optionally present upper dimension of the sealing element (49) is compensated during clamping of the sealing element (49) by a compensating movement in the region of the curvature (53).
  • a possible deformation of the sealing element (49) takes place thereby at a precisely defined and predetermined location.
  • the pressure in the receiving space (47) deforms the buckle (53) in the direction of the support surface (48).
  • Air can pass through the venting recess (55) into an environment.
  • the transverse force acting on the curvature (53) is transformed by the curvature (53) into a longitudinal force, which leads to an additional compression of the sealing element (49) against the support ring (52) and thereby increases the seal. With increasing pressure within the receiving space (47) and the sealing effect is increased.
  • the pressurized gas from the receiving space (47) flows back through the connecting channel (56) in the interior (57) and due to the elastic properties, the curvature (53) also returns to its original shape.
  • the cavity (54) is filled with ambient air through the venting recess (55).
  • the material of the sealing element (59) is selected to be softer than the material of the preform (1). Damage to the preform (1) can be avoided.
  • An optimal reversible deformation process of the sealing element (49) can be supported by a suitable wall thickness profile of the sealing element (49).

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

Abstract

L'invention concerne un procédé et un dispositif de moulage de récipients par soufflage. Selon ledit procédé, des paraisons en matière thermoplastique sont chauffées au niveau d'une section de chauffe puis transférées à un dispositif de soufflage. Au niveau du dispositif de soufflage, les paraisons sont moulées sous forme de récipients à l'intérieur de moules de soufflage sous l'effet d'une pression de soufflage. Un élément d'étanchéité, placé au niveau du dispositif de soufflage, est guidé contre une bague d'appui de la paraison. Une fois en contact avec la bague d'appui, l'élément d'étanchéité est d'abord précontraint mécaniquement contre la bague d'appui puis contraint pneumatiquement. On obtient ainsi un espace de réception autour de l'orifice d'écoulement de la paraison, la pression régnant dans cet espace étant sensiblement identique à celle régnant à l'intérieur de la paraison, ce qui permet d'éviter une déformation de l'orifice d'écoulement.
PCT/DE2008/000259 2007-02-23 2008-02-07 Procédé et dispositif de moulage de récipients par soufflage Ceased WO2008101468A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007009026.0 2007-02-23
DE102007009026A DE102007009026A1 (de) 2007-02-23 2007-02-23 Verfahren und Vorrichtung zur Blasformung von Behältern

Publications (2)

Publication Number Publication Date
WO2008101468A2 true WO2008101468A2 (fr) 2008-08-28
WO2008101468A3 WO2008101468A3 (fr) 2008-11-13

Family

ID=39596530

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/000259 Ceased WO2008101468A2 (fr) 2007-02-23 2008-02-07 Procédé et dispositif de moulage de récipients par soufflage

Country Status (2)

Country Link
DE (1) DE102007009026A1 (fr)
WO (1) WO2008101468A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104136194A (zh) * 2011-12-27 2014-11-05 株式会社吉野工业所 吹塑成型装置和吹塑成型容器的制造方法
US12170849B2 (en) 2022-02-04 2024-12-17 Applied Materials, Inc. Pulsed illumination for fluid inspection

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1394270B1 (it) * 2009-03-31 2012-06-06 Sacmi Apparato di soffiaggio di preforme.
DE102013012209A1 (de) 2013-07-19 2015-01-22 Khs Corpoplast Gmbh Vorrichtung zur Blasformung von Behältern
DE102014005183A1 (de) 2014-04-03 2015-10-22 Khs Corpoplast Gmbh Vorrichtung zur Blasformung von Behältern
EP3277479B1 (fr) 2015-04-30 2021-06-09 KHS Corpoplast GmbH Dispositif de moulage par soufflage de contenants
JP7234213B2 (ja) * 2018-04-03 2023-03-07 日精エー・エス・ビー機械株式会社 ブロー成形金型及びブロー成形装置

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE2352926A1 (de) 1973-10-22 1975-04-24 Heidenreich & Harbeck Gmbh Verfahren und vorrichtung zum erwaermen eines werkstueckes aus kunststoff
US4552527A (en) * 1984-10-09 1985-11-12 Sewell Plastics, Inc. Nozzle assembly
DE4212583A1 (de) 1992-04-15 1993-10-21 Krupp Corpoplast Masch Vorrichtung zur Blasformung
DE4340291A1 (de) 1993-11-26 1995-06-01 Krupp Corpoplast Masch Mehrfachnutzung von Blasluft
DE19906438A1 (de) 1999-02-16 2000-08-17 Krupp Corpoplast Masch Verfahren und Vorrichtung zur Übergabe von Behältern
DE102005011804B4 (de) * 2005-03-15 2021-12-30 Khs Corpoplast Gmbh Verfahren und Vorrichtung zur Blasformung von Behältern
FR2889673B1 (fr) * 2005-08-12 2007-10-26 Sidel Sas Installation de soufflage comportant une tuyere equipee d'un joint d'etancheite a levre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104136194A (zh) * 2011-12-27 2014-11-05 株式会社吉野工业所 吹塑成型装置和吹塑成型容器的制造方法
CN104136194B (zh) * 2011-12-27 2017-08-11 帝斯克玛股份有限公司 吹塑成型装置和吹塑成型容器的制造方法
US12170849B2 (en) 2022-02-04 2024-12-17 Applied Materials, Inc. Pulsed illumination for fluid inspection

Also Published As

Publication number Publication date
WO2008101468A3 (fr) 2008-11-13
DE102007009026A1 (de) 2008-08-28

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