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WO2003055665A1 - Procede et dispositif d'equilibrage de temperature de preformes - Google Patents

Procede et dispositif d'equilibrage de temperature de preformes Download PDF

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Publication number
WO2003055665A1
WO2003055665A1 PCT/DE2001/004714 DE0104714W WO03055665A1 WO 2003055665 A1 WO2003055665 A1 WO 2003055665A1 DE 0104714 W DE0104714 W DE 0104714W WO 03055665 A1 WO03055665 A1 WO 03055665A1
Authority
WO
WIPO (PCT)
Prior art keywords
preforms
electrodes
electrode
preform
heating element
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/DE2001/004714
Other languages
German (de)
English (en)
Inventor
Peter Rose
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.)
KHS GmbH
Original Assignee
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 KHS Corpoplast GmbH filed Critical KHS Corpoplast GmbH
Priority to DE10197198T priority Critical patent/DE10197198D2/de
Priority to PCT/DE2001/004714 priority patent/WO2003055665A1/fr
Priority to AU2002226293A priority patent/AU2002226293A1/en
Publication of WO2003055665A1 publication Critical patent/WO2003055665A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/122—Drive means therefor
    • B29C49/1229—Drive means therefor being a cam mechanism
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0861—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using radio frequency
    • 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
    • B29C49/48—Moulds
    • B29C2049/4879—Moulds characterised by mould configurations
    • B29C2049/4889—Mould halves consisting of an independent neck, main and bottom part
    • 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
    • B29C49/56—Opening, closing or clamping means
    • B29C2049/566—Locking means
    • B29C2049/5661—Mechanical
    • 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
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/783—Measuring, controlling or regulating blowing pressure
    • B29C2049/7832—Blowing with two or more pressure levels
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B29C33/26—Opening, closing or clamping by pivotal movement
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • 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
    • 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
    • B29C49/28—Blow-moulding apparatus
    • B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
    • B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about one axis
    • 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
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073—Grippers
    • 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
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073—Grippers
    • B29C49/42075—Grippers with pivoting clamps
    • 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
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073—Grippers
    • B29C49/42085—Grippers holding inside the neck
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6458—Thermal conditioning of preforms characterised by temperature differential tangentially, i.e. along circumference
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B29C49/685—Rotating the preform in relation to heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material

Definitions

  • the invention relates to a method for tempering preforms made of a thermoplastic material which, following their tempering within a blow mold, are shaped into a container by the action of a medium under pressure, in which the preforms are at least temporarily exposed to electromagnetic radiation which has a frequency in the range of 1 MHz to 100 GHz.
  • the invention further relates to a device for tempering preforms made of a thermoplastic material, which is provided with at least one heating element that as a Radiation generator is formed, the radiation of which at least partially has electromagnetic waves with a frequency in the range from 1 MHz to 100 GHz.
  • pre-tempered preforms made of a thermoplastic material for example preforms made of PET (polyethylene terephthalate)
  • a blow molding 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 in a controlled manner.
  • 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.
  • the preforms can also be handled with other support devices.
  • the use of gripping pliers for handling preforms and the use of expanding mandrels that are used to hold them in one Mouth area of the preform are also included in the available designs.
  • the handling of the preforms takes place on the one hand in the so-called two-stage process, in which the preforms are first produced in an injection molding process, then stored temporarily and only later conditioned in terms of their temperature and blown into a container.
  • the preforms are suitably tempered and then inflated immediately after their injection molding manufacture and sufficient solidification.
  • blowing stations used in the case of blowing stations which are arranged on rotating transport wheels, a book-like opening of the mold carriers can often be found. However, it is also possible to use mold carriers which are displaceable relative to one another or guided in a different manner. In the case of stationary blow molding stations, which are particularly suitable for accommodating a plurality of cavities for forming containers, plates which are arranged parallel to one another are typically used as mold carriers.
  • the preforms are heated in a two-stage process and the corresponding temperature profiling is carried out when the one-stage process is carried out, using infrared emitters.
  • infrared emitters With such infrared emitters, relatively high amounts of energy can be introduced into the preforms in a short time. Due to the efficiency of the infrared emitter however, a considerable amount of energy is released to the environment of the temperature control device or the blow molding machine. The resulting greatly reduced efficiency leads to relatively high energy costs.
  • the object of the present invention is therefore to improve a method of the type mentioned in the introduction in such a way that the temperature control of a large number of preforms per unit of time is supported.
  • This object is achieved in that the preforms are guided past an electrode generating the electromagnetic radiation for at least part of the duration of their temperature control.
  • Another object of the present invention is to construct a device of the type mentioned in the introduction in such a way that a high production capacity is provided.
  • heating element is arranged at least in some areas next to a transport path of the preforms.
  • the arrangement of the heating element next to the transport path of the preforms and the resulting bypassing of the preforms to the electrode generating the electromagnetic radiation enables both good shielding and the heating of a relatively large number of preforms per unit of time to be achieved. It is not necessary to insert the preforms into a heating device by means of a lifting movement and to remove them again, the heating device can instead be arranged in a stationary manner and the preforms can be easily guided past.
  • the heating of the preforms is determined by coordinating the transport speed, the length of the temperature control section and the radiation energy provided per unit area.
  • a frequency range from 10 MHz to 100 MHz is particularly preferred.
  • the preforms be continuously moved past the electrode.
  • the preforms When implementing devices with lower production output, it is also possible for the preforms to be moved past the electrode step by step.
  • an electrode inserted into at least one of the preforms is moved together with the preform.
  • a highly effective shielding with a simple geometric design is provided in that the preforms are enclosed in a tunnel-like manner by the electrode-like heating element during at least part of their transport path.
  • the preform be held by a support element.
  • the preform it proves to be expedient for the preform to be placed on a support element.
  • the preform is held like a pair of pliers by the support element.
  • the support element is also possible for the support element to be inserted at least in regions into an opening of the preform.
  • a uniform and intensive heating of the preforms is supported in that a counterelectrode can be positioned within the preform, at least in some areas.
  • a simplified drive system with electrodes movably guided in the direction of the transport path can be achieved in that the counterelectrode is arranged to be movable together with the support element along at least part of the transport path of the preform.
  • a simple path of movement of the preforms along their transport path can be provided in that the electrode-shaped heating element is designed like a tunnel.
  • a temperature profile of the preforms in the direction of their longitudinal axis can be supported by the fact that for the heating of the preforms along at least part of the transport path, stick electrodes are arranged which are arranged opposite one another.
  • An advantageous design for generating electromagnetic fields is that the stick electrodes are cylindrical.
  • a simple temperature profiling of the preforms in the direction of their longitudinal axis is supported in particular by the fact that at least two stick electrodes are arranged one above the other in the region of electrode holders transversely to their longitudinal direction.
  • the preforms are provided with a temperature profile in the direction of their preform longitudinal axis before they are fed to the tunnel-like heating element.
  • Temperature profiling is supported in that a temperature profiling of the preforms is carried out using stick electrodes.
  • High field strengths in temperature profiling and the resulting short heating times can be achieved by inserting a rod-shaped counterelectrode into the preforms when performing the temperature profiling.
  • An advantageous geometrical arrangement consists in the fact that when performing temperature profiling of the preforms, rod electrodes and counter electrodes which are positioned in a crossed manner relative to one another are used.
  • the stick electrodes be positioned relative to a longitudinal axis of Vorfor to specify a respective profiling field strength.
  • At least two stick electrodes be controlled differently relative to one another.
  • transverse electrodes are transported through the tunnel-shaped electrodes together with the preforms.
  • the transverse electrodes be positioned so that they can be positioned.
  • the transverse electrodes be positioned together with the counter electrodes.
  • Exact adherence to specified movement profiles can be achieved by positioning the transverse electrodes in a curve-controlled manner.
  • Another possibility for specifying a temperature profile ⁇ is that an uneven profiling field is generated by using a profiled counterelectrode.
  • FIG. 2 shows a longitudinal section through a blow mold in which a preform is stretched and expanded
  • FIG. 6 shows a perspective illustration of a preform in the region of a tunnel-shaped electrode, a counterelectrode being introduced into the preform shown cut in the vertical direction,
  • Fig. 12 a schematic representation of a tunnel electrode, in which transverse electrodes are transported together with the preforms.
  • FIG. 1 The basic structure of a device for shaping preforms (1) into containers (13) is shown in FIG. 1 and in FIG. 2.
  • the device for forming the container (13) essentially consists of a blow molding station (33) which is provided with a blow mold (34) into which a preform (1) can be inserted.
  • the preform (1) can be an injection molded part made of polyethylene terephthalate.
  • the blow mold (34) consists of mold halves (35, 36) and a base part (37) which is lifted by a lifting device (38). is positionable.
  • the preform (1) can be held in the area of the blowing station (33) by a transport mandrel (39) which, together with the preform (1), passes through a plurality of treatment stations within the device.
  • a connection piston (40) is provided below the transport mandrel (39) to enable a compressed air supply line. arranged, which supplies the preform (1) with compressed air and at the same time seals relative to the transport mandrel (39). In the case of a modified construction, it is in principle also conceivable to use fixed compressed air supply lines.
  • the preform (1) is stretched using a stretching rod (41) which is positioned by a cylinder (42).
  • a stretching rod (41) which is positioned by a cylinder (42).
  • the use of curve segments is particularly expedient when a plurality of blowing stations (33) are arranged on a rotating blowing wheel.
  • the use of cylinders (42) is expedient if there are blowing stations (33) arranged in a fixed position.
  • the stretching system is designed such that a tandem arrangement of two cylinders (42) is provided.
  • the stretching rod (41) is first moved from a primary cylinder (43) to the area of the bottom of the preform (1) before the actual stretching process begins.
  • the primary cylinder (43) with the stretching rod extended is positioned together with a slide (44) carrying the primary cylinder (43) by a secondary cylinder (45) or via a cam control.
  • the secondary cylinder (45) in a cam-controlled manner in such a way that a respective stretching position is specified by a guide roller (46) which slides along a cam track while the stretching process is being carried out.
  • the guide roller (46) is pressed against the guideway by the secondary cylinder (45).
  • the carriage (44) slides along two guide elements (47).
  • FIG. 2 shows the preform (1), drawn in broken lines, and schematically a developing container bladder (14).
  • Fig. 3 shows the basic structure of a blowing machine, which is provided with a rotating heating wheel (52) and a rotating blowing wheel (53).
  • a preform input 54
  • the preforms (1) are transported by transfer wheels (55, 56) into the area of the heating wheel (52).
  • transfer wheels (55, 56) are radiant heaters (57) and blowers
  • thermoplastic material can be used as the thermoplastic material.
  • PET PET, PEN or PP can be used.
  • the preform (1) is expanded during the orientation process by compressed air supply.
  • the compressed air supply is divided into a pre-blowing phase in which gas, for example compressed air, is supplied at a low pressure level and a subsequent main blowing phase in which gas is supplied at a higher pressure level.
  • Compressed air with a pressure in the interval from 10 bar to 25 bar is typically used during the pre-blowing phase and compressed air with a pressure in the interval from 25 bar to 40 bar is fed in during the main blowing phase.
  • Fig. 4 shows a longitudinal section through a preform (1) which is held by support elements (39) and arranged within a tunnel-shaped heating element (57).
  • the heating element (57) forms an electrode of a high-frequency heating.
  • High frequency is understood here to mean all electromagnetic waves with a frequency above the visible light. In particular, the term high frequency thus also includes microwaves.
  • a counter electrode is in the preform (1)
  • the support element (39) consists of a transport mandrel on which the preform (1) is attached. In principle, however, it is also conceivable to implement the support element (39), for example, as a tong-shaped holding element.
  • the electrical field that heats the preform (1) forms between the counter electrode (2) and the tunnel-shaped heating element (57). It has proven to be particularly advantageous to arrange the tunnel-shaped heating element (57) and the counter electrode (2) at a relatively small distance from one another.
  • Heating element (57) consisting of two radiation devices arranged opposite one another
  • FIG. 6 shows the arrangement according to FIG. 4 in a perspective illustration.
  • the tunnel-shaped heating element (57) extends in a curved manner along the circumference of the heating wheel (52) shown in FIG. 3.
  • Such a design proves to be expedient, for example, if a chain-like drive for the support elements (39) is used instead of the heating wheel (52).
  • Such chain-like or linked drives can be Transport along a movement path that can be specified within a wide free space.
  • the diagram shows the dependence of the heating time in seconds on a set temperature in degrees Celsius generated by high frequency when using a tunnel electrode and without temperature compensation.
  • the lower course shows the temperature in the area of an inside of the preform (1)
  • the upper course shows the temperature in the area of an outside of the preform (1)
  • the middle course shows the temperature in a middle of the wall of the preform (1).
  • the diagram shows the time required to reach a given temperature at a given radiant power.
  • the diagram in FIG. 8 shows the dependence of the heating time for PET preforms in the case of exposure to high frequency after heating with the tunnel electrode as a function of a temperature to be achieved when using parallel cylinder electrodes and without temperature compensation.
  • the left curve illustrates the temperature of an outside of the preform (1)
  • the right curve shows the temperature in the area of an inside of the preform (1)
  • the middle curve shows the temperature in the area of a center of the wall of the preform (1).
  • FIG. 9 it can be seen how, in the case of parallel rod-shaped electrodes without dielectric, the field strength results as a function of the distance of the respective location from the electrodes.
  • a radiation device (3) is in the area of the distance with the value "0" and the radiation device (4) is in the area of the distance "42" arranged.
  • the distance between the radiation devices (3, 4) is thus 42 mm.
  • the radius chosen was 4 mm, the voltage between the radiation devices (3, 4) is 15,000 volts.
  • the preforms (1) To support uniform heating of the preforms (1) in the circumferential direction, provision is made for the preforms (1) to rotate at least temporarily during their heating.
  • the preforms (1) When producing rotationally symmetrical containers (13), the preforms (1) are rotated at least during the predominant time of heating.
  • containers (13) which have a cross-sectional configuration that deviates from a circular contour, it can also prove advantageous to rotate the preforms (1) only temporarily or to provide a stepwise rotation in order to produce a defined temperature profile in the circumferential direction.
  • Shielding an environment against escaping high-frequency radiation is of particular importance when carrying out heating using high frequency. Basically, for example, it is contemplated to provide the entire blow molding machine with a shield which, similar to a Faraday vision cage, prevents high-frequency radiation from escaping. In the area of the machine's transparent covers, fine metal grids can be used, similar to the doors of microwave ovens.
  • the electrode-shaped tunnel can be surrounded by a further metallic tunnel, the outer metallic tunnel being grounded. In this way, very effective shielding can be provided.
  • the tunnel-shaped electrode When using chain-shaped or chain-like transport elements for holding the preforms (1) in the area of the heating device, it is also contemplated to provide the tunnel-shaped electrode with a circumferential, closed profile. Such a profile preferably has side walls that run parallel to one another and curved upper and lower regions with a constant transition into the parallel side faces. Such a design considerably reduces parasitic radiation from high-frequency radiation and the effort for separate shielding devices can be reduced.
  • the tunnel-shaped electrode (57) is also intended to be formed from individual segments.
  • the segmentation can take place, for example, in the vertical or in the horizontal direction. It is also possible to perform a segmentation by separating the upper bulge area of the tunnel-shaped electrode.
  • the arrangement described in Fig. 5 is preferably used to carry out a heat profile of the preform (1) in the direction of a longitudinal axis Vorfor (8). For example, it is possible to either control the individual stick electrodes (5) differently or to change the spacing of the electrodes opposite one another relative to one another.
  • FIG. 10 shows an embodiment in which the electromagnetic field for profiling the preform (1) is not generated between the rod electrodes (5) of the electrode holders (6, 7) lying opposite one another, but instead as a counter electrode (2) into the interior of the preform (1) inserted rod is used.
  • Such a process sequence has the advantage that there is only a relatively small distance between the rod electrodes (5) and the counterelectrode (2), so that high field strengths can be achieved and in which an effective focusing of the radiation is also supported in order to achieve a precisely defined one To achieve temperature profiling.
  • FIG. 10 there is a crossed electrode arrangement between the counter electrode (2) and the stick electrodes (5).
  • the specification of an effective field strength can also be specified in this embodiment either by controlling the individual stick electrodes (5) or by changing the distance of the stick electrodes (5) relative to the counter electrodes (2).
  • a heating intensity specification can be achieved both via the applied voltage and via the generated frequency.
  • 11 shows a further variant in which a counterelectrode (2) profiled with respect to its contour is used to carry out temperature profiling.
  • the counter electrode (2) has an electrode base (9), an electrode head (10) and an electrode shaft (11).
  • the electrode shaft (11) is provided with a waist-like taper.
  • FIG. 13 shows, in a highly simplified manner, a plan view of a horizontally cut tunnel-shaped electrode (57).
  • a plurality of preforms (1), into which counter electrodes (2) are inserted, are arranged within the tunnel.
  • transverse electrodes (14) are transported through the tunnel-shaped heating elements (57) together with the preforms (1).
  • a preferred embodiment consists of a length (15) and a width (16) of tunnel segments (17), which are relative by the transverse electrodes (14) are delimited from each other, about the same dimensions. This provides square tunnel segments (17) with respect to their cross-sectional area, the electromagnetic field heating the preforms (1) being generated between these walls of the tunnel segments (17) and the counterelectrode (2).
  • a positioning of the transverse electrodes (14) can, for example, together with the lifting movement of the counter electrodes (2) when entering the preforms
  • both the counter electrodes (2) and the transverse electrodes (14) is preferably carried out in a curve-controlled manner. However, other positions are also possible, for example using servo drives.
  • Electrodes opposite one another for carrying out the HF heating which electrodes are, for example, plate-like or rod-like and are arranged for shielding within a tunnel-shaped shielding electrode. Such an arrangement avoids inserting counter electrodes into the preforms.
  • thermo profiling can also be carried out with high-frequency emitters like basic temperature control, but it is also possible for them Temperature profiling of IR emitters or others

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

Abstract

L'invention concerne un procédé et un dispositif servant à équilibrer la température de préformes (1) en matériau thermoplastique. Après avoir été tempérées dans un moule de soufflage (34, 37, 51), ces préformes (1) sont transformées en un récipient (13) sous l'effet d'un milieu sous pression. Ces préformes sont soumises, au moins par intermittence, à un rayonnement électromagnétique d'une fréquence comprise entre 1 MHz et 100 GHz. Au moins pendant une partie de la durée d'équilibrage de température, ces préformes sont dirigées devant une électrode produisant un rayonnement électromagnétique. Un élément chauffant sous forme d'électrode est installé au moins dans une zone proche d'une voie de transport des préformes.
PCT/DE2001/004714 2001-12-13 2001-12-13 Procede et dispositif d'equilibrage de temperature de preformes Ceased WO2003055665A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10197198T DE10197198D2 (de) 2001-12-13 2001-12-13 Verfahren und Vorrichtung zur Temperierung von Vorformlingen
PCT/DE2001/004714 WO2003055665A1 (fr) 2001-12-13 2001-12-13 Procede et dispositif d'equilibrage de temperature de preformes
AU2002226293A AU2002226293A1 (en) 2001-12-13 2001-12-13 Method and device for tempering preforms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2001/004714 WO2003055665A1 (fr) 2001-12-13 2001-12-13 Procede et dispositif d'equilibrage de temperature de preformes

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
WO2006105769A1 (fr) * 2005-04-07 2006-10-12 Sig Technology Ltd. Procede et dispositif servant a equilibrer la temperature de preformes
WO2007131701A3 (fr) * 2006-05-11 2008-03-06 Krones Ag Dispositif de chauffe d'ébauches en plastique
EP2425959A1 (fr) * 2010-09-06 2012-03-07 Krones AG Dispositif et procédé de chauffage de préformes
CN102380951A (zh) * 2010-09-06 2012-03-21 克罗内斯股份公司 用于加热预成型坯件的装置
EP2439047A2 (fr) 2010-10-11 2012-04-11 Krones AG Dispositif et procédé destinés au chauffage d'ébauches en plastique

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US3830893A (en) * 1972-04-25 1974-08-20 Monsanto Co Method of processing high nitrile preforms
US4396816A (en) * 1979-11-27 1983-08-02 The Continental Group, Inc. Apparatus for processing polyethylene terephthalate preforms
EP0089201A2 (fr) * 1982-03-11 1983-09-21 Continental Packaging Company, Inc. Rechauffage de paraisons au moyen d'énergie à radio fréquence
US4407651A (en) * 1982-02-05 1983-10-04 The Continental Group, Inc. Hybrid reheating system and method for polymer preforms
US4409455A (en) * 1982-03-05 1983-10-11 Cincinnati Milacron Inc. Dielectric heating section for blow molding machine
US4476364A (en) * 1981-10-06 1984-10-09 The Continental Group, Inc. Radio frequency heating system for heating thermoplastic material preforms

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Publication number Priority date Publication date Assignee Title
US3830893A (en) * 1972-04-25 1974-08-20 Monsanto Co Method of processing high nitrile preforms
US4396816A (en) * 1979-11-27 1983-08-02 The Continental Group, Inc. Apparatus for processing polyethylene terephthalate preforms
US4476364A (en) * 1981-10-06 1984-10-09 The Continental Group, Inc. Radio frequency heating system for heating thermoplastic material preforms
US4407651A (en) * 1982-02-05 1983-10-04 The Continental Group, Inc. Hybrid reheating system and method for polymer preforms
US4409455A (en) * 1982-03-05 1983-10-11 Cincinnati Milacron Inc. Dielectric heating section for blow molding machine
EP0089201A2 (fr) * 1982-03-11 1983-09-21 Continental Packaging Company, Inc. Rechauffage de paraisons au moyen d'énergie à radio fréquence

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006105769A1 (fr) * 2005-04-07 2006-10-12 Sig Technology Ltd. Procede et dispositif servant a equilibrer la temperature de preformes
WO2007131701A3 (fr) * 2006-05-11 2008-03-06 Krones Ag Dispositif de chauffe d'ébauches en plastique
AU2007251881B2 (en) * 2006-05-11 2011-03-31 Krones Ag Microwave heating device for plastic blanks and method for heating plastic blanks by means of microwaves
US8231823B2 (en) 2006-05-11 2012-07-31 Krones Ag Heating device for plastic blanks
EP2210728A3 (fr) * 2006-05-11 2012-08-22 Krones AG Dispositif de chauffage pour ébauches en plastique
EP2213435A3 (fr) * 2006-05-11 2012-08-22 Krones AG Dispositif de chauffage pour ébauches en plastique
EP2213434A3 (fr) * 2006-05-11 2012-08-22 Krones AG Dispositif de chauffage pour ébauches en plastique
EP2425959A1 (fr) * 2010-09-06 2012-03-07 Krones AG Dispositif et procédé de chauffage de préformes
CN102380951A (zh) * 2010-09-06 2012-03-21 克罗内斯股份公司 用于加热预成型坯件的装置
EP2439047A2 (fr) 2010-10-11 2012-04-11 Krones AG Dispositif et procédé destinés au chauffage d'ébauches en plastique
DE102010047914A1 (de) 2010-10-11 2012-04-12 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Erwärmen von Kunststoffvorformlingen
CN102441983A (zh) * 2010-10-11 2012-05-09 克朗斯股份有限公司 加热塑料预制件的设备与方法

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DE10197198D2 (de) 2004-10-28
AU2002226293A1 (en) 2003-07-15

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