EP2507033A2 - Four de conditionnement de préformes - Google Patents

Four de conditionnement de préformes

Info

Publication number
EP2507033A2
EP2507033A2 EP10772981A EP10772981A EP2507033A2 EP 2507033 A2 EP2507033 A2 EP 2507033A2 EP 10772981 A EP10772981 A EP 10772981A EP 10772981 A EP10772981 A EP 10772981A EP 2507033 A2 EP2507033 A2 EP 2507033A2
Authority
EP
European Patent Office
Prior art keywords
heating
preform
heating chamber
oven according
radiation
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Withdrawn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
EP10772981A
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 EP2507033A2 publication Critical patent/EP2507033A2/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Withdrawn legal-status Critical Current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
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging 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
    • B29C49/68—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
    • B29C2035/0822—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
    • B29C2049/7867—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
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073—Grippers
    • B29C49/42087—Grippers holding outside 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
    • B29C49/6427—Cooling of preforms
    • B29C49/643—Cooling of preforms from 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
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6427—Cooling of preforms
    • B29C49/6435—Cooling of preforms from the outside
    • 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
    • B29C49/68—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
    • B29C49/78—Measuring, controlling or regulating

Definitions

  • the invention relates to a rotary type kiln for conditioning preforms according to the preamble of claim 1.
  • 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.
  • the published patent application DE 10 2006 015853 A1 proposes to heat preforms into individual irradiation chambers surrounding the preforms in each case circumferentially, wherein the individual chambers are arranged in the form of a carousel.
  • 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 preform is introduced completely into the irradiation chamber.
  • it remains unclear how the temperature distribution in the individual chambers can be influenced flexibly and as independently as possible, and how the heat output delivered in the chamber can be used as effectively as possible for heating the preform.
  • the heating chambers of DE 10 2006 015853 A1 are predominantly thermally insulated radially outwards, they are in direct contact with each other, so that heat equalization between the heating chambers is possible.
  • the chambers are open at the top, so that heat can escape unused and uncontrolled.
  • Materials suitable for the insulating layer are preferably plastics, in particular PET, polyethylene, polystyrene, Neopor or polyurethane, but also aluminum, in particular layered aluminum, ceramics, mineral bevels such as glass or rock wool, ceramic film in a layer composite with other materials, wood or cork.
  • plastics in particular PET, polyethylene, polystyrene, Neopor or polyurethane, but also aluminum, in particular layered aluminum, ceramics, mineral bevels such as glass or rock wool, ceramic film in a layer composite with other materials, wood or cork.
  • Other conceivable materials would be composite pulp systems, hemp, flax, coconut or reed slabs.
  • Mineral foams such as aerated concrete, pumice, (Prelite) expanded clay, expanded mica, calcium silicate or foam glass can also be used.
  • composite layers comprising any selection from the materials mentioned.
  • a lid is provided on the recess of the heating chamber in order to close the heating chamber thermally insulating in the unpopulated state. This minimizes temperature fluctuations in the heating chamber and further reduces thermal losses.
  • the holding device comprises at least one gripping element, which can be cooled by a liquid and / or air flow, for holding and cooling a mouth region of the preform during the irradiation. This can ensure that the mouth region, which should remain unchanged during the blowing process, is not heated inadmissibly, so that sufficient stability of the mouth region during the irradiation and the subsequent blowing process is ensured.
  • At least one ventilation inlet for the eccentric injection of cooling air into the preform is provided on the holding device in order to convey the injected cooling air substantially along the inside of the preform wall.
  • at least one ventilation inlet for introducing a cooling air flow and a ventilation outlet for discharging the air flow are provided on the heating chamber in order to convey cooling air along the outside of the preform wall. This makes it possible to prevent the outside of the preform from becoming disproportionately heated compared to a central wall region or the inside of the preform.
  • the heating chamber and the holding device are rotatably mounted to each other to swirl the cooling air flow in the heating chamber and / or helically along the preform.
  • the surface of the preform can be uniformly cooled circumferentially.
  • At least one temperature sensor for determining an internal temperature is provided in the heating chamber, the oven further comprising a control unit for setting an infrared heating power and / or a cooling air flow in the heating chamber on the basis of the determined internal temperature.
  • a timing of the heating of the preform can be set in the heating chamber and / or a certain temperature level can be maintained in the heating chamber.
  • a preferred embodiment of the invention further comprises air guiding devices, which are inclined and / or curved against a direction of rotation of the heating wheel, in order to guide air accumulated by rotation of the heating wheel against the heating chambers.
  • air guiding devices which are inclined and / or curved against a direction of rotation of the heating wheel, in order to guide air accumulated by rotation of the heating wheel against the heating chambers.
  • the heating chamber comprises at least one radiant heater in the form of a heating coil embedded in a ceramic layer, the ceramic layer being adapted for emission in the range from 2 to 3.5 ⁇ m.
  • the ceramic layer By the ceramic layer, a larger and more uniform radiating surface compared to the heating coil can be provided and the spectral range of the radiated heat radiation and its spatial distribution can be adapted to produce a desired temperature distribution in the preform. In the wavelength range of 2 to 3.5 ⁇ a particularly large proportion of the radiated heat radiation is absorbed in the preform, so that the heating can be particularly well focused on a specific wall area.
  • the heating chamber comprises at least one radiant heater in the form of a light radiator with a maximum radiation at a wavelength of less than 2 ⁇ , in particular a bright radiating halogen radiator, a bright light emitting diode and / or a bright-emitting laser.
  • a light radiator with a maximum radiation at a wavelength of less than 2 ⁇ in particular a bright radiating halogen radiator, a bright light emitting diode and / or a bright-emitting laser.
  • Such radiators can be based on low inertia control time particularly accurate and allow adaptation of the irradiation spectrum to different preform materials and material thicknesses. Due to the comparatively low absorption in the wall of the preform, the light radiation can excite a passive radiator arranged on the rear side of the irradiated wall.
  • the heating modules further each comprise a heating rod for irradiating an inner wall portion of the preform with infrared radiation, the apparatus being further adapted to raise and lower the holding device and / or the heating rod to insert and withdraw the heating rod into the preform.
  • the additional heating rod With the additional heating rod, the wall of the preform can be uniformly irradiated and heated over its entire thickness.
  • wall areas can thereby be irradiated, in particular in the vicinity of the mouth region of the preform, which can only be irradiated inadequately by the outer radiant heater.
  • the lifting device also facilitates the axial profiling of the preform by targeted irradiation of axial areas of the preform.
  • the heating modules further comprise a thermally insulating housing for the heating element, in which the heating element can be withdrawn, wherein on the housing in particular a lid is provided to close the housing with retracted heating rod thermally insulating.
  • a plurality of radiators with different and / or separately adjustable heating power are provided on the heating rod in the longitudinal direction.
  • an axial thermal profiling of the preform wall, in particular on the inside be facilitated by selective activation of the individual radiator.
  • a temporal variation of the axial profiling is possible without moving the heating element in the preform.
  • At least one ceramic layer for emitting infrared light is provided on the heating element, in particular by converting bright radiation having a radiation maximum at a wavelength of less than 2 ⁇ into a longer wavelength radiation having a wavelength in the range from 2 to 3.5 ⁇ .
  • This makes it possible to operate the heating element completely or additionally passive by acting from the outside of the preform radiant radiation through the wall acts on the heating element and is converted by this into radiation which is particularly effective for heating the inside of the preform.
  • a radiation shield which can be cooled by a liquid and / or air stream is provided on the heating element and / or the holding device in order to shield and / or cool the mouth region with respect to the infrared radiation emitted by the heating element.
  • the heating chambers are thermally insulated from each other.
  • the heating chambers are thermally insulated only to the outside and communicate with each other in heat exchanging contact.
  • the mouth regions of the preform are cooled directly with an air flow. This can be formed by a fan inside or outside the furnace and routed via lines to the areas to be cooled.
  • the heating chambers are each cooled by a separate fan.
  • the preforms are not suspended but taken up in the vertical direction with the mouth region down in the heating chamber.
  • Figure 1 is a schematic plan view of a furnace according to the invention with circumferentially uniformly distributed heating chambers.
  • FIG. 2 shows a schematic longitudinal section through a heating chamber of a first embodiment with a central heating element introduced into a preform
  • FIG. 3b shows schematic longitudinal sections through variants of the heating chamber
  • FIG. 4 shows a schematic longitudinal section through an alternative embodiment of the heating chamber according to the invention with a movable shielding
  • FIG. 5 shows a schematic longitudinal section through an alternative variant of the heating chamber with a cooled gripper
  • FIG. 6b show schematic longitudinal sections through alternative embodiments of the heating chamber according to the invention with a cooling function for the outer wall of the heated preform
  • FIG. 7 is a schematic representation of air cooling for the heated by a heating mandrel interior of the preform.
  • Fig. 8 is a plan view of an embodiment of the furnace with Lucasleitvorraumen for
  • FIG 9 shows a schematic longitudinal section through a heating chamber with temperature sensors.
  • the furnace 1 is designed as a rotary and comprises a rotatably mounted heating wheel 2, on the circumferentially evenly distributed heating modules 3 are arranged, the number of which can differ from the example shown and each have a heating chamber 4 for heating each comprise a preform 5 and a holding device 7 for holding the preform 5, wherein the holding device 7 can be moved via a lifting device 9 at least in the axial direction with respect to the longitudinal axis 5 'of the preform 5.
  • the holding devices 7 and the lifting devices 9 are set up so that they each can take over a preform 5 from a conventional inlet starwheel (not shown) and lower it into the heating chamber 4.
  • the heated preform 5 can be transferred from the holding device 7 and the lifting device 9 to a conventional outlet star (not shown) for further processing of the preform 5.
  • an insulation layer 10 is provided on the heating chambers 4 in each case.
  • the insulating layer 10 surrounds the heating chamber 4, preferably with the exception of an opening 4a of the heating chamber for introducing the preform 5 into the heating chamber 4.
  • the heating chamber 4 is completely enclosed by the insulating layer 10 with respect to the main axis 5 'of the preform 5 to be introduced. As a result, a heat exchange between the heating chambers 4 of the individual heating modules 3 is largely avoided.
  • FIG. 2 also shows an optional heating rod 13, which can be lowered into the preform 5 via the lifting device 9. At least one heating element or emitter 15 is provided on the heating rod 13 for irradiating the inner side 5b of the preform 5, wherein the emitters 15 (in the example eight pieces) are preferably provided separately. are controllable.
  • the holding device 7 is not shown in FIG. 2 for the sake of clarity.
  • a sleeve-shaped shielding member 17 is further indicated, which surrounds the heating element 13 in an annular shape, and which shields an opening region 5c of the preform 5 relative to the heating element 13 optically and thermally.
  • the shielding element 17 can be cooled by an air flow or a liquid.
  • Figs. 3a and 3b show different variants of the heating elements 11 and 15, which can be combined with each other depending on the embodiment.
  • the insulation layer 10 is only indicated for the sake of clarity.
  • a plurality of heating elements 11 of the heating chamber 4 are formed as axially stacked, annular functional ceramics. These are preferably each actively heated with a wire helix (not shown).
  • the heating elements 11 preferably radiate in the wavelength range of 2 to 3.5 ⁇ .
  • a radiator or heating element 15 is also in the form of a functional ceramic with active heating by a wire coil (not shown) is formed.
  • the preferred spectral range is also for the heating element 15 of the heating element 13 between 2 and 3.5 ⁇ .
  • a plurality of annular heating elements 15 could be stacked in the axial direction one above the other.
  • a heating element 15 in the form of a passive functional ceramic is provided on the heating rod 13. Passive means in this context that the heating element 15 is not provided with its own power supply, but in the heating chamber 4 radiated heat radiation either reflected and / or converted into a heat radiation with a longer wavelength.
  • the heating elements 11 is designed as a light radiator whose radiation is absorbed comparatively weakly in the wall 5d of the preform 5, so that the heating element 15 can also be effectively irradiated with light radiation through the wall 5d.
  • the radiation emitted by the passive radiator 15 then preferably has a greater wavelength and is absorbed comparatively strongly in the wall 5 d of the preform 5.
  • radiators 11 for example light radiators 11a in the form of halogen radiators, a light-emitting diode 11b, which are each characterized in that they have a radiation maximum at a wavelength of less than 2 ⁇ m.
  • a laser would be suitable as a light radiator.
  • a second functional ceramic 11c which may be designed, for example, as a passive functional ceramic for converting an irradiated wavelength into a longer-wave thermal radiation can, and a heated with a heating coil, active functional ceramic 11d with a specially adapted spectral radiation behavior.
  • the various variants of the radiant heater 1 1 can be combined in any way with each other to heat circumferential or axial portions of the preform 5 with selected beam characteristics.
  • FIGS. 3 a and 3 b Shown in FIGS. 3 a and 3 b is the shielding element 17, with which the mouth region 5 c of the preform 5 is protected against excessive irradiation.
  • the inside of the heating chamber wall 4b, 4c is preferably provided with a heat radiation reflecting coating 19 at the locations where no radiant heaters 11 are provided.
  • the radiant heaters 11 and 15 could alternatively emit electromagnetic radiation in another wavelength range, for example microwave radiation, as an alternative to infrared radiation.
  • the radiators are not limited to the rotationally symmetrical shapes shown.
  • different radiators 11, 15 may be formed only as circumferential segments, for example as ring segments.
  • FIG. 4 shows a variant of the heating module 3, in which a cover 21 is provided on the heating chamber 4, with which the opening 4a of the unpopulated heating chamber 4 can be closed, as indicated on the right side of FIG.
  • the equipped with a preform 5 heating chamber 4 is shown on the left side of Fig. 4.
  • the lid 21 is preferably designed so that it acts thermally insulating and heat radiation reflecting.
  • a thermally insulating housing 23 is provided for the heating element 13, on which a cover 25 is formed, which can be closed at unpopulated heating chamber 4, so that the drawn back into the housing 23 heater 13 is thermally insulating and heat radiation is reflective protected against cooling ,
  • an infrared radiation reflecting layer 19 is provided on the inner sides of the housing 23 and the lid 21 and 25.
  • the covers 21 and 25 could be made in one piece and, for example, for closing the heating chamber 4 and the housing 23 are pivoted before this. But they can also be designed in several parts and, for example, as indicated in Fig. 4 by block arrows, are pushed apart or together. For simplicity, the associated operating mechanisms and the holder of the heating element 13 are not shown.
  • a heating of the chambers 4 or of the heating elements 13 after the furnace 1 has been switched on could also be accelerated until an operating temperature is reached.
  • a holding device 7 is shown with a cooled gripper 27 which surrounds the mouth region 5c of the preform 5 from the outside like a pincers.
  • a gripper 27 it would also be possible to form a gripper 27 on the holding device 7, which holds the mouth region 5c from the inside.
  • the gripper 27 is preferably provided with cooling fins 28 in order to cool the gripper 27 by convection, in particular with air, from the outside.
  • liquid cooling in which a cooling liquid flows through the gripper in a manner comparable to a cooling sleeve.
  • the sleeve-shaped shielding element 17 is preferably also cooled, for example by a cooling liquid flow or an air flow.
  • a platen of the heating chamber 4 for a support ring 5e formed on the preform 5 may be formed as a cooled shield 29, the gripper 27 being capable of being thermally conductive contacted with the shield 29 (not shown) to grip the gripper 27 with the aid of the shield 29 to cool.
  • the gripper 27 may be formed so that it is in thermally conductive contact with the sleeve-shaped shielding member 17, so that both the gripper 27 and the shielding member 17 can be cooled by means of the cooling shield 29. This is particularly advantageous in order to reduce the number of supply lines of cooling liquid and / or cooling air.
  • FIGS. 6 a and 6 b show variants of the heating chamber 4 with active cooling of the outside 5 a of the preform 5 by introducing a cooling air flow 14 symbolized in each case by arrows.
  • the cooling air flow 14 is introduced through a recess 4d in the wall 4b of the heating chamber 4 from below.
  • the cooling air flow 14 is guided essentially along the surface 5 a of the preform 5 and escapes from the heating chamber 4 through recesses 4 e, which are provided, for example, on a support plate 4 f for the support ring 5 e of the preform 5 can.
  • a gap 11a is provided in each case between the heating elements 11, through which the cooling air flow 14 introduced from below can escape to the outside.
  • the recesses 4e are preferably arranged so that the air flow 14 is conducted radially outside the heating elements 11 through the support plate 4f.
  • the variant of FIG. 6a or the variant of FIG. 6b can be particularly advantageous.
  • 6a and 6b is advantageous if a superficial region of the wall 5d of the preform 5 is excessively heated by the action of heat radiation compared to a central wall region, in particular if long-wave infrared radiation is used, which is particularly well absorbed in the wall 5d.
  • the direction of the cooling air flow 14 could also be reversed, ie, run from top to bottom in the drawings 6a and 6b.
  • FIG. 7 shows a variant in which the inside 5b of the preform 5 is actively cooled by a cooling air flow 14.
  • the heating chamber 4 is not shown here for the sake of simplicity.
  • the cooling air flow 14 is introduced asymmetrically at a distance 14a to the main axis 5 'of the preform on one side of the heating element 13 from above into the preform 5 and guided along the heating rod 13 or the inner side 5b.
  • the cooling air flow 14 is again discharged to the outside through the circumferentially opposite side of the preform 5.
  • the inner wall 5b of the preform 5 can be cooled to prevent excessive heating of a superficial portion of the wall 5d of the preform 5 by the action of heat radiation emanating from the heating rod 13 compared to a central wall portion. This may be advantageous in particular when exposed to long-wave infrared radiation.
  • Fig. 8 shows an embodiment of the furnace 1 according to the invention, in which the heating chambers 4 and the heating modules 3 are cooled by the supply of a cooling air flow 34 during the rotation of the heating wheel 2.
  • air-guiding devices 31 are provided on the heating wheel 2, in each case associated with the heating modules 3, for example suitably shaped walls or channels, which can be designed in particular as air baffles. These are curved and / or inclined in the direction of rotation 2 a of the heating wheel 2, so that when the heating wheel 2 is pushed up, pent-up air is conducted as cooling air flow 34 through the louvers 31 in the direction of the heating modules 3.
  • FIG. 8 shows an embodiment of the furnace 1 according to the invention, in which the heating chambers 4 and the heating modules 3 are cooled by the supply of a cooling air flow 34 during the rotation of the heating wheel 2.
  • air-guiding devices 31 are provided on the heating wheel 2, in each case associated with the heating modules 3, for example suitably shaped walls or channels, which can be designed in particular as air baffles. These are curved and
  • the air guiding devices 31 function in a manner comparable to paddle wheels, the cooling air 34 being conducted past the heating modules 3 and being discharged through a central collecting shaft 33.
  • cooling fins 35 may be formed on the heating chambers 4. Such cooling may be advantageous, although the heating chambers 4 are thermally insulated. Remaining residual heat can also be dissipated this way and kept away from thermally sensitive assemblies.
  • the cooling air flow 34 can be used to cool the holding device 7, the gripper 27, the shield 17 and / or the mouth region 5c of the preform 5. Alternatively or in addition to the illustrated air cooling, it would also be possible to cool the heating chambers 4 with liquid cooling.
  • FIG. 9 shows a further variant of the heating chamber 4, in which temperature sensors 41 are additionally provided. These can be provided, for example, in the vicinity of the recesses 4d of the supply line 14b or on the discharge 14c of the cooling air 14. With the temperature sensors 41, it is possible to monitor the temperature within the heating chamber 4. Likewise, it is conceivable, with the aid of the temperature sensor 41 and a suitable control device, to regulate the amount of cooling air introduced into the heating chamber 5, in particular in the case of forced convection with a fan. However, this would also be possible with free convection. A temperature control can also be used to stabilize the heat distribution in the preform and / or to compensate for differences between individual heating chambers 4 or preforms 5.
  • the temperature in the heating chambers 4, in particular after closing the lid 21, when the heating chamber 4 is not equipped, can be set constant or at a uniform starting temperature for heating the preforms 5.

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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)

Abstract

L'invention concerne un four de conditionnement de préformes, comportant un plateau chauffant sur lequel sont disposées plusieurs chambres de chauffe qui chauffent chacune une préforme. Les parois des chambres de chauffe, notamment le fond des chambres de chauffe opposé à l'évidement prévu pour l'introduction des préformes, ainsi que les parois contiguës à ce fond comportent une couche isolante afin d'isoler thermiquement les chambres de chauffe, ce qui permet de chauffer les préformes indépendamment les unes des autres, de manière souple et efficace en termes d'énergie.
EP10772981A 2009-12-04 2010-10-20 Four de conditionnement de préformes Withdrawn EP2507033A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009047540A DE102009047540A1 (de) 2009-12-04 2009-12-04 Ofen zum Konditionieren von Vorformlingen
PCT/EP2010/006421 WO2011066885A2 (fr) 2009-12-04 2010-10-20 Four de conditionnement de préformes

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EP2507033A2 true EP2507033A2 (fr) 2012-10-10

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EP10772981A Withdrawn EP2507033A2 (fr) 2009-12-04 2010-10-20 Four de conditionnement de préformes

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US (1) US20120269918A1 (fr)
EP (1) EP2507033A2 (fr)
CN (1) CN102725124A (fr)
DE (1) DE102009047540A1 (fr)
WO (1) WO2011066885A2 (fr)

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DE102009047540A1 (de) 2011-06-09
US20120269918A1 (en) 2012-10-25
WO2011066885A3 (fr) 2011-09-09
WO2011066885A2 (fr) 2011-06-09
CN102725124A (zh) 2012-10-10

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