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EP1868785A1 - Procede et dispositif servant a equilibrer la temperature de preformes - Google Patents

Procede et dispositif servant a equilibrer la temperature de preformes

Info

Publication number
EP1868785A1
EP1868785A1 EP06722740A EP06722740A EP1868785A1 EP 1868785 A1 EP1868785 A1 EP 1868785A1 EP 06722740 A EP06722740 A EP 06722740A EP 06722740 A EP06722740 A EP 06722740A EP 1868785 A1 EP1868785 A1 EP 1868785A1
Authority
EP
European Patent Office
Prior art keywords
preform
heating
heating zone
microwaves
microwave
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Withdrawn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
EP06722740A
Other languages
German (de)
English (en)
Inventor
Horst Muegge
Klaus-Martin BAUMGÄRTNER
Rudolf Emmerich
Matthias Graf
Karl-Heinz Balkau
Klaus Hartwig
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
SIG Technology AG
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 filed Critical SIG Technology AG
Publication of EP1868785A1 publication Critical patent/EP1868785A1/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Withdrawn legal-status Critical Current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
    • 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
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or 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
    • 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
    • B29C49/12—Stretching rods
    • 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
    • B29C49/42093—Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42095—Rotating wheels or stars
    • 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
    • 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
    • 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
    • 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
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • 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
    • B29C49/6454—Thermal conditioning of preforms characterised by temperature differential through the preform thickness
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to a method for controlling the temperature of preforms made of a thermoplastic material, in which the preforms are exposed at least partially and at least temporarily to microwave radiation.
  • the invention furthermore relates to a device for tempering preforms made of a thermoplastic material which has at least one microwave generator and at least one heating zone bounded by a wall.
  • Such methods and devices are used, for example, for the tempering of preforms, which are converted into a container after thermal conditioning by a blowing process.
  • bottles are made of plastic in such a container molding.
  • Blastikein precisely be preforms made of a thermoplastic material, for example, preforms made of PET (polyethylene terephthalate), supplied to different processing stations within a blow molding machine.
  • a blow molding machine of the type having a heating device and a blowing device, in the region of which the previously tempered preform is expanded by biaxial orientation to a container. The expansion takes place by means of compressed air, which is introduced into the preform to be expanded.
  • the preforms as well as the blown containers may be transported by means of different handling devices.
  • the use of transport thorns, onto which the preforms are attached, has proven to be useful.
  • the preforms can also be handled with other support devices.
  • the use of tongs for handling preforms and the use of spreaders for mounting in a mouth region of the preform are also part of the available constructions.
  • a handling of containers using transfer wheels is described, for example, in DE-OS 199 06 438 in an arrangement of the transfer wheel between a blowing wheel and a discharge path.
  • blow stations which are arranged on rotating transport wheels, a book-like Aufklappbarkeit the mold carrier is often-meet. But it is also possible to use relative to each other ver-displaceable or differently guided mold carriers.
  • 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 preformed rings are typically attached to transport mandrels which either pass the preform through the entire Transport blowing machine or circulating only in the heating device.
  • transport mandrels which either pass the preform through the entire Transport blowing machine or circulating only in the heating device.
  • the preforms are usually plugged onto a sleeve-shaped holding element of the transport mandrel.
  • expanding mandrels are introduced into the mouths of the preforms, which clamp the preforms in the rule.
  • thermoplastic material has pronounced thermally insulating properties, sufficient time for the preforms to heat up for about 20 seconds results in adequate heat propagation. To avoid overheating of the surface areas of the preform takes place at the same time for heating and blowing with cooling air. This results in a relatively high energy consumption for the implementation of the heating.
  • Object of the present invention is to improve a method of the type mentioned in the introduction so that with low mechanical engineering effort a high-quality heating is supported at the same time high throughput rates.
  • This object is achieved in that the microwave radiation, a heat profile in the wall of the preform is produced, that the preform ling is heated in at least one bounded by a wall heating zone, which receives only a portion of the preform and that during at least one part the temperature is generated relative movement between the preform and the heating zone.
  • a further object of the present invention is to design a device of the type mentioned in the introduction in such a way that high throughput rates are supported with a simple structural design.
  • This object is achieved in that the heating zone is dimensioned such that it receives only a portion of the preform and that a positioning device for generating a relative movement between the preform and the heating zone adjacent to the heating zone is arranged.
  • the microwaves have a high penetration depth in the material of the preform, so that a volumetric heating of the preforms is supported. It can thereby be generated a favorable radial temperature profile in the wall of the preform. Due to a high conversion rate of the energy used into heat energy within the preform wall, the efficiency of the heating is substantially increased.
  • the effectiveness of the heating can be further increased by the fact that the microwave radiation is concentrated in a portion of the heating zone.
  • a shortening of the heating time can be achieved despite the use of a small-sized microwave generator in that the preform is arranged in the region of the concentrated microwave radiation.
  • a typical field of application is defined by tempering the preform with microwave radiation in the frequency range from 0.8 to 12 GHz.
  • a microwave generator with predetermined ter fixed frequency or variable frequency is used.
  • the preform is moved relative to a stationary heating zone.
  • the heating zone is moved relative to the preform.
  • the generation of a desired temperature profile is assisted, in particular, by carrying out the relative movement between the preform and the heating zone in the direction of a preform longitudinal axis.
  • the preform is heated by several heating zones simultaneously.
  • the generation of an advantageous field distribution within the heating zone can be assisted by superposing two microwaves in the region of the heating zone. In principle, however, only a microwave can be used.
  • At least two microwaves of the same frequency are superimposed.
  • at least two microwaves of different frequency are superimposed. These different frequency microwaves can be generated by a plurality of microwave generators.
  • Back-reflection damage to the microwave generator can be avoided by dissipating microwave radiation reflected back from the heating zone in the direction of the microwave generator.
  • the microwave radiation generates a temperature profile in the material of the preform in the direction of the preform longitudinal axis.
  • the microwave radiation generates a temperature profile in the material of the preform in the circumferential direction.
  • a particularly preferred field of application is that the tempered preform is transformed into a container following the heating with the microwaves by a blow molding process.
  • An optimization of the heating process can be carried out by performing an impedance matching during the execution of the microwave heating.
  • 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
  • FIG. 3 shows a sketch to illustrate a basic structure of a device for blow-molding containers
  • FIG. 5 shows a schematic representation of the coupling of a microwave generator with a heating zone using typical coupling elements
  • FIG. 7 shows a schematic longitudinal section through a preform arranged in the region of the heating zone
  • FIG. 8 shows a longitudinal section through a preform, which is simultaneously introduced into a plurality of heating zones
  • 9 shows an illustration of an arrangement having a plurality of heating zones arranged one behind the other and at a distance
  • FIG. 10 is a diagram illustrating a plurality of blowable temperature profiles
  • FIG. 11 shows a field-like arrangement of a plurality of heating zones for simultaneous heating of a plurality of preforms.
  • 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), which is a lifting device (8) is positio-nierbar.
  • the preform (1) can be held in the region of the blowing station (3) by a transporting mandrel (9) which, together with the preform (1), passes through a plurality of treatment stations within the device. But it is also possible to use the preform (1), for example via pliers or other handling means directly into the blow mold (4).
  • a connecting piston (10) is arranged below the transport mandrel (9). assigns the compressed air to the preform (1) and at the same time performs a seal relative to the transport mandrel (9).
  • a connecting piston (10) is arranged below the transport mandrel (9). assigns the compressed air to the preform (1) and at the same time performs 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 exemplary embodiment by means of a stretch 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 posi-tioned 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 by the secondary cylinder (16) against the guideway.
  • the carriage (15) slides along two guide elements (18). After closing the mold halves (5, 6) arranged in the region of carriers (19, 20), 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 blasting machine, which is provided with a heating section (24) and a rotating blowing wheel (25). Starting from a preform input (26), the preforms become
  • heating elements (30) and blower (31) are arranged to temper the pre-moldings (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 other ⁇ berga- begann a discharge 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-blow phase in which gas, for example compressed air, is supplied at a low pressure level and subdivided into a subsequent main blow phase in which gas at a higher pressure level is supplied, during the pre-blow phase typically Compressed air is used with a pressure in the interval of 10 bar to 25 bar and during the main blowing phase compressed air is supplied with a pressure in the interval from 25 bar to 40 bar.
  • the heating section (24) is formed of a plurality of revolving transport elements (33) which are strung together like a chain and guided by Um-steering wheels (34).
  • the chain-like arrangement would open up a substantially rectangular basic contour.
  • a single relatively large-sized guide wheel (34) and in the area of adjacent deflections two comparatively smaller dimensioned deflection wheels (36) used.
  • any other guides are conceivable.
  • the arrangement shown to be particularly useful since three deflection wheels (34, 36) are positioned in the region of the corresponding extent of the heating section (24) , in each case the smaller deflection wheels (36) in the region of the transition to the linear courses of the heating track (24) and the larger deflection wheel (34) in the immediate transfer area to the transfer wheel (29) and to the input wheel (35) ,
  • chain-like transport elements (33) it is also possible, for example, to use a rotating heating wheel.
  • Fig. 4 shows the basic structure of a heating element (30).
  • the heating element (30) has a microwave generator (41), which is typically designed as a magnetron.
  • the microwave generator (41) can be coupled to a heating zone (44) via the series connection of a circulator (42) and a tuner (43).
  • the circulator (42) serves to prevent re-radiation of microwaves into the microwave generator (41).
  • microwave radiation reflected from the heating zone (44) is discharged via the circulator (42) into a water load (45) and absorbed there.
  • the circulator (42) and the tuner (43) may be formed as a waveguide. Likewise, training as a coaxial conductor is possible.
  • the circulator (42) has a design similar to a T-piece, wherein the middle leg of the T-piece opens into the water load (42).
  • the absorption of microwave energy by the preform (1) is essentially dependent on the dielectric properties of the material of the preform (1). These dielectric properties are temperature-dependent and change during the performance of the heating.
  • the impedance matching using the tuner (43) can be either controlled or regulated, including impedance detection.
  • a measurement of a current impedance can be performed using diode elements.
  • Temperature measurement can be done using typical infrared sensors. A high-quality temperature measurement is possible in particular because essentially only the preform and not adjacent to the preform components are heated and thereby stray radiation is largely avoided.
  • the heating zone (44) is designed as a coupling-in system for the microwave radiation.
  • a microwave field of high power density is generated in the area of the heating zone (44).
  • the high power density can be achieved, for example, by reducing the height of the waveguide, by dielectric or metallic auxiliary bodies and / or by suitable shaping of walls of the heating zone (44).
  • a resonator chamber with an E010 resonance is used.
  • a height of the waveguide is increased by 30%, and when using a stack of heating zones (44), a height of the waveguide is reduced by 60%.
  • Fig. 6 illustrates an embodiment of the arrangement in Fig. 5.
  • the circulator (42) is realized here with a docked water load (45).
  • an analysis unit (46) is arranged between the circulator (42) and the tuner (43).
  • Through the heating zone (44) extends through an antenna (47).
  • Behind the door ner (43) is a transition element (48) arranged to allow a transition from the waveguide to a coaxial conductor.
  • the transition element (48) is terminated by a short gate valve (49).
  • Another connection of the heating zone (44) opens via a further transition element (50) in a waveguide (51) which is connected to a short-circuiting slide (52) and a water load (53).
  • the analysis unit (46) detects the impedance of the microwave system and the tuner (43) and the short shifters (49, 52) adjust the impedance of the microwave generator (41) to the present microwave path.
  • Fig. 7 shows a longitudinal section through a preform (1), which is arranged in the region of the heating zone (44).
  • the preform (1) is moved both around a preform longitudinal axis (54) and also positioned in the direction of the preform axis (54).
  • the illustrated embodiment shows a stationary heating zone (44), which is partially enclosed by a wall (55).
  • the heating zone (44) is formed like a chamber and has two openings (56, 57), which are adapted to an external dimensioning of the preform (1).
  • the openings (56, 57) have a circular configuration and are provided with a diameter that is slightly larger than an outer diameter of the preform (1).
  • a field distribution within the heating zone (44) forms as a temperature profile on the preform (1).
  • a movement of the preform (1) relative to the heating zone (44) preferably with variably adjustable speed, one can adjustable temperature profile along the parison longitudinal axis (54) are generated.
  • FIG. 8 shows an embodiment in which a plurality of heating zones (44) are arranged in a stack in the direction of the preform longitudinal axis (54) one behind the other. Even with such an arrangement, either the preform (1) can be moved relative to the heating chambers (44) or the heating chambers (44) relative to the preform (1).
  • the power input into the preform (1) can be regulated by various methods. In principle, it proves to be advantageous to use a microwave generator (41) with controllable power. Another control parameter is the specification of the relative speed between the preform (1) and the heating chamber (44). With a variable speed specification, it is possible, for example, to generate locally higher temperatures by means of lower speeds of movement. It is also possible to use the tuner (43) to vary the power flow in the feeder by an impedance change. When stacking a plurality of heating chambers (44), the impedance change is expediently carried out in all feeds used. When using a plurality of heating zones (44) next to or above each other, there is a minimization of the high-frequency technical coupling of the individual heating zones (44).
  • FIG. 9 shows an arrangement in which a plurality of heating zones (44) are arranged one behind the other in a transport direction (58) of the preforms (1).
  • the individual heating zones (44) each have a spacing relative to one another.
  • the preform (1) will be included of this embodiment with its preform longitudinal axes (54) in the transport direction (58) moves.
  • An arrangement of the preforms (1) can take place on transport elements (59).
  • a relative movement between the preforms (1) and the heating zones (44) is generated by the transport speed of the preforms (1) and / or a movement of the heating zones (44). In particular, it is intended to move the heating zones (44) independently of one another.
  • the 10 shows a compilation of blowable temperature profiles.
  • the course (60) shows the temperature distribution over the product length for the blown container (2), the course (61) the corresponding temperature distribution after carrying out the microwave heating for the preform (1) and the course (62) the corresponding temperature distribution in use a conventional infrared heater instead of microwave heating according to the invention. It can be seen in particular that the unwanted temperature control of the mouth region of the preform in the length range from 0 to 20 mm can be significantly reduced by microwave heating.
  • Fig. 11 shows a field-like arrangement of a plurality of heating zones (44) to allow parallel heating of a plurality of preforms (1).
  • the heating elements (30) according to the invention make it possible, in particular, to cause a local concentration of the microwaves within the heating zone (44). It is thereby possible to carry out the corresponding concentration of the microwaves in that region of an inner space of the heating zone (44) in which the preform ling (1) is arranged. This concentration makes it possible to minimize the resulting heating time without using extremely powerful microwave generators (41).
  • both IR emitters and microwaves can be used to control the temperature of the preforms (1).
  • a heating of the mouth of the preform (1) opposite ground area with IR radiation is particularly preferred.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (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 en matière thermoplastique. Ces préformes sont au moins partiellement et au moins temporairement exposées à un rayonnement micro-ondes. Ce rayonnement micro-ondes permet d'obtenir un profil de température dans la paroi (55) de la préforme. Cette préforme est chauffée dans au moins une zone de chauffe (44), délimitée par une paroi et contenant seulement une partie de la préforme. Pendant au moins une partie du processus d'équilibrage de température, un mouvement relatif entre la préforme et la zone de chauffe est généré.
EP06722740A 2005-04-07 2006-03-30 Procede et dispositif servant a equilibrer la temperature de preformes Withdrawn EP1868785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005017128 2005-04-07
PCT/DE2006/000590 WO2006105769A1 (fr) 2005-04-07 2006-03-30 Procede et dispositif servant a equilibrer la temperature de preformes

Publications (1)

Publication Number Publication Date
EP1868785A1 true EP1868785A1 (fr) 2007-12-26

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Country Link
EP (1) EP1868785A1 (fr)
DE (1) DE112006001499A5 (fr)
WO (1) WO2006105769A1 (fr)

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US10071521B2 (en) 2015-12-22 2018-09-11 Mks Instruments, Inc. Method and apparatus for processing dielectric materials using microwave energy
US12170849B2 (en) 2022-02-04 2024-12-17 Applied Materials, Inc. Pulsed illumination for fluid inspection

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CN101454142B (zh) * 2006-05-11 2013-05-08 克朗斯股份有限公司 塑料坯加热装置
DE102008024108A1 (de) 2008-05-17 2009-11-19 Krones Ag Vorrichtung und Verfahren zum gesteuerten Erwärmen von Kunststoffbehältnissen
DE102009005358A1 (de) * 2009-01-16 2010-07-22 Krones Ag Resonatoreinheit, Expansionsverfahren und Vorrichtung zur Erwärmung von Behältnissen
DE102010028042A1 (de) * 2010-04-21 2011-10-27 Krones Ag Vorrichtung und Verfahren zum thermischen Konditionieren eines Vorformlings
DE102010032964A1 (de) * 2010-07-30 2012-02-02 Krones Aktiengesellschaft Vorrichtung zum Erwärmen von Kunststoffvorformlingen mit Sterilraum
DE102010048417A1 (de) * 2010-10-15 2012-04-19 Krones Aktiengesellschaft Vorrichtung zum Herstellen von Kunststoffbehältnissen mit variabler Stationsabschaltung
ITPR20120020A1 (it) * 2012-04-06 2013-10-07 Gea Procomac Spa Dispositivo e metodo per il riscaldamento di una preforma in materiale plastico
FR3037850B1 (fr) 2015-06-26 2018-01-19 Sidel Participations Procede de chauffe hybride infrarouge et micro-ondes d'ebauches de recipients
EP3888885B1 (fr) * 2020-04-02 2023-07-26 Fricke und Mallah Microwave Technology GmbH Four convoyeur à micro-ondes
EP4301577A4 (fr) * 2021-03-03 2025-02-12 Husky Injection Molding Systems Luxembourg IP Development S.à.r.l Procédé et appareil de chauffage d'ébauche en plastique

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JP4126090B2 (ja) * 1996-04-19 2008-07-30 株式会社吉野工業所 プリフォームの口頸部を結晶化する方法
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Publication number Priority date Publication date Assignee Title
US10071521B2 (en) 2015-12-22 2018-09-11 Mks Instruments, Inc. Method and apparatus for processing dielectric materials using microwave energy
US10940635B2 (en) 2015-12-22 2021-03-09 Mks Instruments, Inc. Method and apparatus for processing dielectric materials using microwave energy
US12170849B2 (en) 2022-02-04 2024-12-17 Applied Materials, Inc. Pulsed illumination for fluid inspection

Also Published As

Publication number Publication date
WO2006105769A1 (fr) 2006-10-12
DE112006001499A5 (de) 2008-03-20

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