EP2507034A1 - Four de conditionnement de préformes - Google Patents

Four de conditionnement de préformes

Info

Publication number
EP2507034A1
EP2507034A1 EP10776559A EP10776559A EP2507034A1 EP 2507034 A1 EP2507034 A1 EP 2507034A1 EP 10776559 A EP10776559 A EP 10776559A EP 10776559 A EP10776559 A EP 10776559A EP 2507034 A1 EP2507034 A1 EP 2507034A1
Authority
EP
European Patent Office
Prior art keywords
heating
preform
preforms
modules
temperature
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Withdrawn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
EP10776559A
Other languages
German (de)
English (en)
Inventor
Frank Winzinger
Christian Holzer
Wolfgang Schönberger
Konrad Senn
Andreas Wutz
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.)
Krones AG
Original Assignee
Krones 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 Krones AG filed Critical Krones AG
Publication of EP2507034A1 publication Critical patent/EP2507034A1/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Withdrawn legal-status Critical Current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
    • 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
    • B29C49/42—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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/786—Temperature
    • 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
    • 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
    • B29C49/786—Temperature
    • B29C2049/7861—Temperature of the preform
    • 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
    • B29C49/786—Temperature
    • B29C2049/7867—Temperature of the heating or cooling means
    • B29C2049/78675—Temperature of the heating or cooling means of the heating 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6464—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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6465—Cooling
    • 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
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6466—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on the inside
    • 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
    • B29C49/681—Ovens specially adapted for heating preforms or parisons using a conditioning receptacle, e.g. a cavity, e.g. having heated or cooled regions
    • 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
    • B29C49/6825—Mounting exchanging or centering ovens or parts thereof
    • 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
    • B29C49/683—Adjustable or modular conditioning means, e.g. position and number of heating elements
    • 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
    • B29C49/6835—Ovens specially adapted for heating preforms or parisons using reflectors
    • 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

Definitions

  • the invention relates to a rotary type kiln for conditioning preforms according to the preamble of claim 1, a method for calibrating heating modules of the furnace according to the invention and a method for conditioning preforms in the furnace according to the invention.
  • Containers to be produced in the blow-molding or stretch blow molding process are formed from so-called preforms or preforms, which must be heated to a desired process temperature before the actual blowing process.
  • preforms or preforms which must be heated to a desired process temperature before the actual blowing process.
  • individual wall areas of the preform are to be heated in a metered manner, preferably with infrared radiation.
  • a continuous stream of preforms is passed through a furnace with appropriately adapted irradiation sections.
  • a problem of such ovens is to introduce as much of the radiated heat output as possible in the preforms.
  • each preform is heated both by the inner wall of the chamber designed as a ceramic infrared radiator and by a rod-shaped infrared radiator introduced into the preform.
  • the heating modules comprise a temperature measuring device for measuring at least one temperature of the preform and / or the heating chamber, a heating energy which is likely to be required can be estimated more accurately.
  • the furnace further comprises a control device for controlling the heating modules, in particular the radiant heater and the holding and lifting devices, based on the measured temperature, the temperature measured values can be processed in the control device and set the heating power and / or heating time of the individual heating modules targeted to heat the preforms as much as possible to the desired extent and in all heating modules.
  • the temperature measuring means comprises a central upstream temperature sensor for measuring a preform start temperature and / or remote temperature sensors provided at the heating chambers for measuring a temperature of the heating chamber during heating.
  • a desired value of the heating power can be determined in order to ensure a desired heating of the preform in the heating chamber.
  • decentralized temperature sensors on the heating chambers the temperature rise in the heating chamber can be monitored and readjusted if necessary.
  • the control device is preferably set up in order to set a heating power of the heating module, a heating duration and / or a residence time of the preform in the heating chamber on the basis of the measured temperature.
  • the heating chamber comprises a bottom which can be adjusted in an axial direction with respect to the main axis of the preform.
  • the length of the heating chamber can be adapted to the length of the preform and the same heating chamber can be used for preforms of different lengths. A change between different sized heating chambers is thus unnecessary.
  • the adjustable bottom is actively heated and / or infrared radiation reflective formed.
  • the preform can be effectively irradiated, in particular in a bottom region of the preform.
  • the heating chamber preferably comprises a plurality of radiant heaters arranged one behind the other in an axial axial direction with respect to the main axis of the preform, which are separated from one another can be operated to adapt an active radiator surface formed by the operated radiant heaters to a region of the preform to be irradiated.
  • the heat radiation emitted can be adapted particularly precisely to the area of the preform to be irradiated.
  • the radiant heaters can be switched off in a targeted manner not to be irradiated area of the heating chamber, in particular in a region below the adjustable floor.
  • the preform can be heated in a targeted and energy-efficient manner, and it can be avoided that the heating chamber inadmissibly heats up, in particular below the adjustable bottom.
  • the heating modules each further comprise a heating element for irradiating the preform with infrared radiation
  • the holding and lifting device is further adapted for raising and lowering the heating element to insert the heating element in the preform or withdraw from this.
  • a maximum depth to which the heating element can be inserted into the preform is adjustable.
  • the heating rod collides with the bottom of the preform and, on the other hand, that a bottom region of the preform is only insufficiently irradiated or heated by the heating element.
  • a plurality of heat radiators arranged one after the other in an axial axial direction with respect to the main axis of the preform are formed on the heating rod and can be operated separately to adapt an active radiator surface formed by the operated radiant heaters to a region of the preform to be heated.
  • the radiator surface can be adapted in a particularly favorable manner to irradiation of the tear-off edge of the preform in the neck region of the container to be blown.
  • a support plate for a formed on the preform support ring is provided on the heating chamber, wherein the support plate is connected to the heating chamber via a plug-in coupling and / or a magnetic coupling quickly changeable.
  • the heating chamber is suitable for the irradiation of preforms with different diameters of the support ring or of the portion of the preform to be irradiated. With such a coupling, the oven can be particularly quickly adapted for conditioning differently sized preforms.
  • support plates can be easily placed on the heating chamber without additional connectors. For this purpose, a stop in the radial direction can be sufficient.
  • an axial transformer or a slip ring for supplying power to the heating modules is provided on the heating wheel, and the control device is arranged co-rotating on the heating wheel.
  • the object underlying the invention is further achieved by a method for calibrating the heating modules of the furnace according to the invention, wherein the method comprises the steps defined in claim 12.
  • the method comprises the steps defined in claim 12.
  • the underlying object is further achieved with a method for conditioning preforms, in particular for the stretch blow molding of plastic containers, in the oven according to the invention, the method comprising the steps defined in claim 13. Because the heating modules are individually controlled or regulated on the basis of a measured starting temperature of the preforms, the preforms can be heated uniformly and in all heating modules uniformly.
  • the underlying object is also achieved by a method for conditioning preforms, in particular for the stretch blow molding of plastic containers, in the oven according to the invention, the method comprising the steps defined in claim 14.
  • the preforms can be heated uniformly and in all heating modules.
  • the heating modules in particular their heating energy supply and the dwell time of the preforms in the heating chambers, are furthermore controlled or regulated on the basis of the individual correction values determined in the calibration method according to the invention.
  • the individual preforms in the heating chambers can be heated in a particularly uniform and uniform manner, since both the heating time and the heating time in the heating chamber are increased.
  • the amount of heat available in each case can be adjusted uniformly and substantially uniformly for all heating chambers.
  • the preforms are not suspended but received with the mouth region in the vertical direction downwardly standing in the heating chamber.
  • the furnace may be designed to heat preforms only with certain heating chambers. This may be necessary if you want to operate the oven with a lower output of preforms.
  • the heating chambers, which are not equipped, remain empty. For example, it is possible to equip only every second heating chamber with a preform. Heating chambers that are not equipped, are preferably not heated. The distance between the preforms can be compensated after heating for blowing on individual blow molding stations.
  • a value is measured from a container made from the preforms and reported back to the heating chamber in which the preform in question has been heated.
  • the measured value is preferably a wall thickness of the finished container.
  • a temperature is detected at one or more radial or axial locations of the preform and a correction value is reported back to the respective heating chamber.
  • Fig. 1 is a schematic plan view of a furnace according to the invention of
  • FIGS. 2a and 2b are schematic longitudinal sections through variants of the heating chambers according to the invention.
  • FIG 3 shows a schematic longitudinal section through a variant of the heating chambers according to the invention with adjustable bottom.
  • FIG. 7a to 7c show a schematic representation of a rapidly exchangeable heating element and the use of heating elements of different lengths in the irradiation of preforms of different sizes.
  • the oven 1 is designed as a rotary machine and comprises a rotatably mounted heating wheel 2 on which circumferentially uniformly distributed a plurality of heating modules 3, each with a heating chamber 4 for heating a preform 5 are arranged.
  • the preform rings 5 can be taken over by holding and lifting devices 6 (not shown in FIG. 1) from a conventional inlet star wheel 7 and transferred into the heating chambers 4, preferably lowered.
  • the heated preforms 5 are correspondingly transferred to a conventional outlet starwheel 8 for further processing of the preform 5 in a blowing process. It would also be possible to move the heating chambers 4 through the holding and lifting devices 6.
  • the holding and lifting devices 6 may comprise, for example, pivotable outer or inner gripper for holding the preforms 5 and / or drives for carrying out a rotational movement between the preforms 5 and the heating modules 3. Also on the holding and lifting devices 6 radiation shields and / or cooling fins or cooling channels may be provided, which are not shown for the sake of clarity in the following.
  • a temperature measuring device 9 is provided, of which only temperature sensors 10a to 10c are simplified in FIG. 1, which are arranged on the inlet starwheel 7, the outlet starwheel 8 or on the heating wheel 2 on each of the heating modules 3. For the sake of clarity, only one of the sensors 10c is shown.
  • the inlet-side temperature sensor 10 a serves to determine a starting temperature of the preform rings 5 before feeding the preform rings 5 into the heating modules 3.
  • the outlet side temperature sensor 10b on the outlet starwheel 8 is configured to measure an end temperature of the preform rings 5 after heating in the heating modules 3.
  • the temperature measuring device 9 thus comprises central or common sensors 10a, 10b, on which successively all the preform rings 5 pass.
  • the temperature sensors 10 c are designed to be decentralized, so that the temperature measuring device 9 is designed for the separate determination or monitoring of the temperature in or on each of the heating chambers 4.
  • the temperature measuring device 9 may have a However, any combination of the temperature sensors 10a to 10c also include only the sensor 10a, 10b or the sensors 10c.
  • a central slip ring 11 for the power supply of the heating modules 3 and at least one control unit 12, which is set up for processing measuring signals of the temperature measuring device 9 and for controlling the heating modules 3, in particular for controlling the heating power and the heating duration of the individual heating modules 3 and The residence time of the preforms in the heating chambers 4.
  • the control units 12 rotate with the heating wheel 2, they are particularly easy to connect to the temperature sensors 10 c and the heating modules 3. Measuring signals of the stationary sensors 10a, 10b could, for example, be transmitted to the control unit 12 by radio or via the slip ring 11.
  • an axial transformer is conceivable.
  • FIG. 2 a shows a thermally insulating heating chamber 4 according to the invention with a fixed chamber bottom 4 a and FIG. 2 b shows an alternative variant of the heating chamber 4 with a bottom element 4 b which is adjustable in height, ie along the main axis 5 'of the preform 5 to be heated.
  • 2a and 2b also differ in that in the heating chamber 4 of Fig. 2a, a comparatively long preform 5 is introduced, in the heating chamber 4 of FIG. 2b, however, a comparatively short preform 5, at the length of which the position of the bottom 4b is adjusted.
  • a central, height-adjustable heating element 13 as an optional component of the heating module 3, the depth of immersion in the heating chamber 4 is adapted to the length of the respective preform 5, and annular, stacked heating elements or radiator 14 on the inner wall of the heating chamber 4.
  • Der Preform 5 can either be held by the holding and lifting device 6 (not shown) above the heating chamber 4, as shown in FIG. 2a, or, as shown in FIG. 2b, with a support ring 5a formed on the preform 5 on a support plate 4c of the heating chamber 4 rest.
  • the heating elements 14 are preferably individually controllable, so that in particular only those heating elements 14 can be actively operated during heating of the preform 5, which are substantially opposite a wall portion 5b of the preform 5 to be heated.
  • the heating elements 14 can also be controlled with regulated or throttled power. For example, it is conceivable that a heating element 14 is operated at half power. For clarity, in FIG. 2b, only those heating elements 14 are shown in white, which are substantially opposite the wall section 5b of the preform 5 to be heated and actively electrically heated in the configuration shown, whereas the non-activated or deactivated heating elements 14 'at the level of the adjustable Ground- elements 4b or underlying dark hatched are shown. This ensures that the heat output of the heating elements 14 can be used effectively to heat the preform 5 and at the same time avoid unwanted heating of areas of the heating chamber 4 not to be irradiated, such as the lateral or lower regions of the adjustable bottom 4b becomes.
  • the position of the height-adjustable bottom 4b can be adapted to preforms 5 of different lengths, for example by means of an adjustment mechanism indicated in FIG. 2b by a block arrow.
  • the irradiation-side surface 4d of the adjustable bottom 4b is preferably designed to reflect infrared radiation.
  • a region 4e may be formed, in which the irradiation-side surface 4d is adapted to the shape of the preform 5, for example in the form of a bulge.
  • the bottom portion of the preform 5 can be irradiated particularly effectively and uniformly.
  • the position of the height-adjustable bottom 4b could be set automatically, for example manually or via the control device 12. Accordingly, the position of the heating element 13 could be adjusted manually or automatically via the holding and lifting device 6. With the height-adjustable heating element 13 and the height-adjustable bottom element 4b, preforms 5 of different sizes can be heated in the same heating chamber 4, so that an exchange of the heating chambers 4 is dispensable when changing between preforms 5 of different sizes. This reduces set-up times of the furnace 1 and makes it unnecessary to stock a large number of different heating chambers 4 or heating rods 3.
  • FIG. 3 shows a variant of the heating chamber 4 with a height-adjustable bottom element 4b, which comprises at least one electrically active heatable heating radiator 15.
  • the further features of the heating chamber 4 of FIG. 3 essentially correspond to the previously described variants of the heating chamber 4, so that corresponding features will not be described again.
  • infrared radiation-reflecting shields 16 and 17 are provided for shielding a mouth region 5c of the preform 5 against that of the heating elements 14, 15 and the heating element 13 in a region of the preform 5 delivered thermal radiation.
  • This optical shield which could additionally also be cooled by a stream of air or by a liquid, prevents the orifice area 5c from undesirably heating up in order to ensure sufficient stability of the mouth area 5c during the heating in the heating chamber 4 and the subsequent blowing process.
  • This optical shield With the actively heated Heating elements 15 of the bottom 4b improved heating of the preform 5 in the bottom portion 5d of the preform 5 is achieved.
  • the adjustment of the displaceable bottom element 4b and / or the height-adjustable heating element 13 could be carried out so that all heating modules 3 are brought in this regard during a revolution of the heating wheel 2 from an actual position to a desired position.
  • the bottom elements 4b and / or the heating rods 13 could then be fixed via a (not shown) clamping device until a new height adjustment is required.
  • a height-adjustable heating element 13 is shown schematically.
  • a plurality, in the axial direction, ie along the main axis 5 ', one above the other arranged radiant heaters or heating elements 18 are provided on the heating element 13, which are preferably individually controlled.
  • the heating elements 18 of the heating element 13 form an axial inner heating region 19 substantially corresponding to a first common radiating surface of the heating elements 18 for irradiating the preform 5 from its inside, and the heating elements 14 of the heating chamber 4 an axial outer heating region 20, substantially corresponding to a second common radiator surface of the heating elements 14 for irradiating the preform 5 from its outer side.
  • the axial inner heating region 19 preferably extends further in the direction of the mouth region 5c of the preform 5 than the axial outer heating region 20.
  • the inner side 5e of the preform 5, in particular in an area adjacent to the supporting ring 5a can be selectively irradiated to the so-called trailing edge for the subsequent blowing of the vessel targeted train.
  • the location of the preform 5 at which the preform 5 is stretched under the support ring 5a when the vessel is blown is designated as the tear-off edge.
  • the axial or vertical position of the tear-off edge can be adapted flexibly with the aid of the heating rod 13.
  • FIGS. 5a and 5b show variants of the heating chamber 4, in which the support plate 4c for the support ring 5a of the preform 5 is designed in the form of a rapidly exchangeable support plate 21.
  • the support plates 21 shown are connected via a magnetic coupling 22 to the heating chamber 4.
  • the heating module 3 with the quickly exchangeable support plate 21 can be adapted to preforms 5 with different outer diameters in a simple and time-saving manner.
  • Such quickly exchangeable support plates 21 could be combined with the described variants of the heating chambers 4 arbitrarily.
  • the heating element 3 is variably adjustable in the vertical direction with respect to the immersion depth in order to more or less strongly heat the region of the neck of the bottle to be formed.
  • the immersion depth of the preform can be adjusted in the heating chamber to more or less strongly heat the area of the bottle neck.
  • Fig. 6 shows a variant of the heating module 3, in which the heating chamber 4 itself is designed as a quick-change component.
  • Fig. 6 shows, for example, at the position I, a comparatively large heating chamber 4, which is connected via a coupling 25, such as a plug-in coupling, with the heating 2 fast changeable.
  • This heating chamber 4 could for example be exchanged for a provided with an identical coupling 25 heating chamber 4 with smaller dimensions, as indicated by the positions II to IV. This procedure is particularly advantageous if the size of the preforms 5 to be exchanged differs particularly strongly.
  • suitable electrical connections or other required for the operation of the heating chamber 4 compounds could be integrated.
  • Fig. 7a shows a heating element 13, which can be connected via a quick-change coupling 26, such as a plug-in coupling with the holding and lifting device 6.
  • a quick-change coupling 26 such as a plug-in coupling with the holding and lifting device 6.
  • FIGS. 7b and 7c it is thus possible to change between heating elements 13 of different lengths in a simple manner and to adapt the heating modules 3 to preforms 5 of different lengths. For example, it can be avoided that a heater rod 13 that is too long for a preform 5 collides with the preform 5 when the heating rod 13 is lowered, or that too short a heating rod 13 can not be lowered far enough into a preform 5 to be heated.
  • the furnace 1 can be particularly easy and fast when changing between preforms 5 different dimensions be converted.
  • other quick-release closures are also conceivable.
  • the heating chambers 4 and the heating elements 13 are subject to a certain tolerance. This applies not only to the shape and dimensional accuracy of the heating chambers 4 and the heating elements 13, but also to the composition of the materials, which may contain, for example, ceramic material mixtures, such as functional ceramics, as components of the radiators 14, 15, 18 which are particularly relevant for the energy input , As well as the structure of the heating chambers 4 and the heating elements 13, in particular with respect to the heat transfer between individual functional components and / or material layers.
  • the preforms 5 in the furnace 1 according to the invention in spite of such tolerances, to be heated as reproducibly as possible and identically to the desired process temperature in all heating modules 3.
  • identical reference models 4 'and 13' are provided for the types of the heating chambers 4 and the heating rods used in the furnace 1 to provide corresponding reference coefficients of effectiveness 31 ', 32' as comparison standard for the individual heating chambers 4 used in the furnace 1 or heating rods 13 to be determined by comparative measurement.
  • a reference coefficient of effectiveness 33 'for the heating module 3' consisting of the reference models 4 'and 13' is determined as a comparison value, which correlates the electrical power used and / or the duration of the electrical power supply to the heating module 3 ' caused heating of the heating chamber 4 'and / or one in the heating chamber 4' arranged preform 5 produces.
  • the reference coefficient of effectiveness 33 ' is preferably provided for a multiplicity of possible settings of the heating module 3', for example for different positions of the adjustable heating chamber bottom 4b 'or the heating elements 13' and / or a different number or arrangement of actively operated heating elements 14 ', 15 'and 18' of the reference model 3 '.
  • a specific electrical energy to be fed in may be specified and the associated temperature increase measured, or vice versa.
  • values of the reference coefficient of effect 33 'determined in this way are determined using the associated parameters, such as the position of the chamber bottom 4b 'in the form of a reference value table 34' in the control device 12 is stored.
  • the reference effect coefficients 31 ', 32' can also be determined in separate (not further described) measuring devices and stored in corresponding reference value tables 34 '. Different variants for calculating comparison values are conceivable here.
  • an associated individual coefficient of effectiveness 33 or separate individual coefficients of effect 31, 32 of the individual module components 4, 13 is determined for each heating module 3 of the furnace 1.
  • the procedure corresponds in each case to the associated reference model 3 ', so that comparable individual effect coefficients 31, 32, 33 or value tables 34 can be provided for each heating module 3 of the furnace 1.
  • the effect coefficients 31, 32 and / or 33 or the value tables 34 of individual heating modules 3 are each separately calculated from the reference coefficients 31 ', 32' and / or 33 'or the values of the reference tables 34'. to obtain an individual correction value 35 for each of the heating modules 3.
  • This correction value 35 can then be used to compensate for a different heating efficiency of the individual heating modules 3 or a different thermal efficiency in order to condition the preforms 5 in all heating modules 3 substantially identically.
  • different calculation variants are conceivable, such as adaptive algorithms and the combination of different value tables 34 or 34 '.
  • the furnace 1 according to the invention can be used, for example, as follows:
  • a continuous stream of preforms 5 to be heated is guided past the inlet-side starwheel 7 past the input-side temperature sensor 10a, wherein the starting temperature of the preforms 5 to be heated is determined in each case and evaluated by the control and regulation unit 12.
  • the preforms 5 are then each supplied to a heating module 3 of the rotating heating wheel 2 and lowered with the lifting device 6 in the heating chambers 4 of the heating modules 3.
  • a desired electric power and a desired heating duration are set by the control unit 12 for each heating module 3 and the heating modules 3 are heated accordingly.
  • the heating of the preforms 5 is checked by the decentralized temperature sensors 10c and can, depending on the end of the heating on the basis of the thus detected temperature values by the control unit 12 during be adapted to the heating.
  • the power supply to the heating modules 3 is interrupted, the preforms 5 are withdrawn from the heating chambers 4 and transferred from the heating wheel 2 to the outlet star 8. There, the heated preforms 5 pass the temperature sensor 10b, with which a discharge-side process temperature of the preforms 5 is determined or checked.
  • the respectively determined temperature is transmitted to the control unit 12 and can be used by this to adapt the energy supply in the individual heating modules 3 for subsequent heating cycles.
  • the calibration according to the invention and the method according to the invention are also particularly suitable when using adjustable heating chambers 4 and / or heating rods 13 to condition differently sized preforms 5 under respectively optimized conditions and thereby a reproducible and for all heating modules 3 similar temperature increase or temperature profiling of the preforms. 5 to ensure.
  • control device 12 could heat only each second or third heating module 3 or equip it with a preform 5, or also any desired proportion of the heating modules 3 provided on the heating wheel 2, for example, to variably adjust an output of the furnace 1 without changing the residence time of the preforms 5 on the heating wheel 2 or other parameters relevant to the conditioning.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

L'invention concerne un four de type à plateau tournant destiné au conditionnement de préformes, notamment pour l'étirage-soufflage de contenants en plastique, ce four comportant un plateau chauffant sur lequel sont disposés plusieurs modules chauffants qui chauffent chacun une préforme. Une mise en température reproductible des préformes par régulation de chaque module chauffant est rendue possible par le fait que les modules chauffants sont dotés d'un dispositif de mesure thermique pour mesurer au moins une température de la préforme et/ou de la chambre de chauffe, et que le four est en outre pourvu d'un dispositif de commande pour piloter les modules chauffants sur la base de la température mesurée.
EP10776559A 2009-12-04 2010-10-20 Four de conditionnement de préformes Withdrawn EP2507034A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009047541A DE102009047541A1 (de) 2009-12-04 2009-12-04 Ofen zum Konditionieren von Vorformlingen
PCT/EP2010/006422 WO2011066886A1 (fr) 2009-12-04 2010-10-20 Four de conditionnement de préformes

Publications (1)

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EP2507034A1 true EP2507034A1 (fr) 2012-10-10

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EP10776559A Withdrawn EP2507034A1 (fr) 2009-12-04 2010-10-20 Four de conditionnement de préformes

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US (1) US20130011807A1 (fr)
EP (1) EP2507034A1 (fr)
CN (1) CN102725123B (fr)
DE (1) DE102009047541A1 (fr)
IN (1) IN2012DN04916A (fr)
WO (1) WO2011066886A1 (fr)

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Also Published As

Publication number Publication date
DE102009047541A1 (de) 2011-06-09
US20130011807A1 (en) 2013-01-10
CN102725123A (zh) 2012-10-10
CN102725123B (zh) 2015-02-11
WO2011066886A1 (fr) 2011-06-09
IN2012DN04916A (fr) 2015-09-25

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