WO2013023789A1 - Procédé et dispositif de moulage de récipients par soufflage - Google Patents

Procédé et dispositif de moulage de récipients par soufflage Download PDF

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Publication number
WO2013023789A1
WO2013023789A1 PCT/EP2012/003500 EP2012003500W WO2013023789A1 WO 2013023789 A1 WO2013023789 A1 WO 2013023789A1 EP 2012003500 W EP2012003500 W EP 2012003500W WO 2013023789 A1 WO2013023789 A1 WO 2013023789A1
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WO
WIPO (PCT)
Prior art keywords
pressure
blowing
supply
container
pressure supply
Prior art date
Application number
PCT/EP2012/003500
Other languages
German (de)
English (en)
Inventor
Michael Litzenberg
Frank Haesendonckx
Michael Linke
Original Assignee
Khs Corpoplast Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Khs Corpoplast Gmbh filed Critical Khs Corpoplast Gmbh
Publication of WO2013023789A1 publication Critical patent/WO2013023789A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/16—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing
    • 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
    • B29C49/4289—Valve constructions or configurations, e.g. arranged to reduce blowing fluid consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/783—Measuring, controlling or regulating blowing pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/783—Measuring, controlling or regulating blowing pressure
    • B29C2049/7832—Blowing with two or more pressure levels
    • B29C2049/7833—Blowing with three or more pressure levels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C49/12—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
    • B29C49/4284—Means for recycling or reusing auxiliaries or materials, e.g. blowing fluids or energy
    • B29C49/42845—Recycling or reusing of fluid, e.g. pressure
    • B29C49/42855—Blowing fluids, e.g. reducing fluid consumption
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B29C49/6855—Cooling of heating means, e.g. avoiding overheating
    • 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
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the invention relates to a method for blow-molding of containers, in which a preform is stretched after thermal conditioning within a blow mold of a stretching rod and formed by blowing pressure into the container and in which initially provided by a low pressure supply low blowing pressure, then at least one of
  • Medium pressure supply provided medium blowing pressure and then used by a high pressure supply provided higher blowing pressure and the blowing air is supplied via at least one blown air valve and in which after a container forming at least a portion of the high pressure blowing air used in the middle -
  • the invention further relates to a device for blow-molding of containers, which has at least one blowing station with a blow mold and at least one stretching rod and in which the blowing station both to a low pressure supply to provide a low blowing pressure, to a medium pressure supply to provide a mean blowing pressure and to a High pressure supply is connected to provide a relatively low and medium blowing pressure higher blowing pressure, and in which a blast air return is used for after a container forming the blowing station escaping high pressure blowing air into the medium pressure supply.
  • a container molding by blowing pressure preforms of a thermoplastic material such as preforms made of PET (polyethylene terephthalate), supplied to different processing stations within a blow molding machine.
  • a blow molding machine has a heating device and a blowing device, in the region of which the previously tempered preform is expanded by biaxial orientation to form a container.
  • the expansion takes place with the aid of compressed air, which is introduced into the preform to be expanded.
  • the procedural sequence in such an expansion of the preform is explained in DE-OS 43 40 291.
  • the introductory mentioned introduction of the pressurized gas also includes the introduction of compressed gas into the developing container bladder and the compressed gas introduction into the preform at the beginning of the blowing process.
  • the preforms as well as the blown containers can be transported by means of different handling devices.
  • the use of transport mandrels, onto which the preforms are attached, has proven to be useful.
  • the preforms can also be handled with other support devices.
  • the use of gripping tongs for handling preforms and the use of expanding mandrels which can be inserted into a mouth region of the preform for mounting are likewise among 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.
  • the already described handling of the preforms takes place firstly in the so-called two-stage process, in which the preforms are first produced in an injection molding process, then temporarily stored and later conditioned in terms of their temperature and inflated to a container.
  • an application in the so-called one-step process in which the preforms are suitably tempered immediately after their injection molding production and sufficient solidification and then inflated.
  • blow molding stations different embodiments are known.
  • blow stations which are arranged on rotating transport wheels, a book-like unfoldability of the mold carrier is frequently encountered. But it is also possible to use relatively movable or differently guided mold carrier.
  • fixed blowing stations which are particularly suitable for receiving a plurality of cavities for container molding, typically plates arranged parallel to one another are used as mold carriers.
  • EP 2298534 describes a method for the recovery of blown air, in which a multi-stage pressure curve is provided both in the region of the pressure reduction and in the region of the pressure build-up.
  • a multi-stage pressure curve is provided both in the region of the pressure reduction and in the region of the pressure build-up.
  • the hitherto known methods and devices are not yet sufficiently suitable for achieving an optimization of the blown air return in such a way that both the largest possible return quantity is ensured and an undesired process time extension is avoided.
  • the object of the present invention is therefore to improve a method of the aforementioned type such that within a permissible working range the largest possible return amount of blast air is achieved.
  • Another object of the present invention is to construct a device of the initially mentioned type such that an optimized blown air return is supported.
  • This object is achieved in that control valves for selectively connecting the blowing stations with the low pressure supply, the medium pressure supply and the high pressure supply to a blast air control are ⁇ closed, a variable UmschaltZeit Vietnamese between the supply of the mean blowing pressure and the supply of the higher blowing pressure in dependence specifies at least one parameter.
  • the variability of the temporal position or the pressure level for switching between the supply of the mean blowing pressure and the supply of the higher blowing pressure enables a process optimization taking into account different by a user specified constraints. For example, it is possible to adaptively change the position of the switching point in such a way that a maximum return quantity of blown air is achieved and thus only a smaller compressor is required for an external compressed air supply of the blow molding machine. It is also possible to carry out the method described above under the constraint of a maximum process time to be maintained. Other possible constraints include, for example, the specification of a minimum time for pending a maximum blowing pressure within the blown container or the prevention of pressure drops during the concern of the maximum blowing pressure.
  • Pressure fluctuations can be reduced by using a storage volume at least for the mean blowing pressure.
  • High quality blast pressure control is supported by measuring the blowing pressure applied to the blowing station.
  • a further homogenization of the pressure supply can take place in that the recycled blown air is supplied to a buffer.
  • An optimization of the blown air return is supported by measuring a volumetric flow provided by a compressor.
  • An optimization of the entire blowing process is supported by the fact that an optimization of the amount of recycled blowing air is performed taking into account a predefinable process time to be observed.
  • a typical procedure is that a connection of the higher blowing pressure takes place when reaching about 40 percent of the pressure forming in the container end pressure.
  • Fig. 1 is a perspective view of a blowing station for producing containers from preforms
  • Fig. 2 is a longitudinal section through a blow mold in which a
  • FIG. 3 shows a sketch to illustrate a basic structure of a device for blow-molding containers
  • Fig. 4 shows a modified heating with enlarged
  • FIG. 5 is a block diagram for illustrating the pneumatic functional components in the blown air return
  • FIG. 6 is a blow pressure curve for illustrating a three-stage pressure build-up with blown air return
  • Fig. 7 is a diagram similar to Figure 6 for
  • FIG. 8 shows a further blow-pressure curve for illustrating a shifted switch-over time for a temporally shortened use of the average blowing pressure.
  • FIG. 9 shows a further blow pressure curve for a process with prolonged use of the mean blow pressure.
  • 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 positionable.
  • the preform (1) can be held in the region of the blowing station (3) by a transport mandrel (9) which, together with the preform (1), passes through a plurality of treatment stations within the device. 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, which feeds 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, which feeds 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 embodiment by means of a stretching rod (11) is positioned by a cylinder (12).
  • a mechanical positioning of the stretch rod (11) is carried out over curve segments, which are acted upon by Abgriff rollers. The use of curve segments is particularly useful when a plurality of blowing stations (3) are arranged on a rotating blowing wheel
  • the stretching system is designed such that a tandem arrangement of two cylinders (12) is provided. From a primary cylinder (13), the stretch rod (11) is first moved to the area of a bottom (14) of the preform (1) before the beginning of the actual stretching operation.
  • the primary cylinder (13) with extended stretching rod together with a carriage (15) carrying the primary cylinder (13) is positioned by a secondary cylinder (16) or via a cam control.
  • the secondary cylinder (16) in such a cam-controlled manner that a current stretching position is predetermined by a guide roller (17) which slides along a curved path during the execution of the stretching operation.
  • the guide roller (17) is pressed by the secondary cylinder (16) against the guideway.
  • the carriage (15) slides along two guide elements (18).
  • Fig. 2 shows in addition to the blown container (2) and dashed lines drawn the preform (1) and schematically a developing container bladder (23).
  • Fig. 3 shows the basic structure of a blow molding machine, which is provided with a heating section (24) and a rotating blowing wheel (25).
  • a preform input (26) the preforms (1) are transported by transfer wheels (27, 28, 29) into the region of the heating path (24).
  • Heater (30) and fan (31) are arranged along the heating path (24) in order to temper the preforms (1).
  • After a sufficient temperature control of the preforms (1) they are transferred to the blowing wheel (25), in the region of which the blowing stations (3) are arranged.
  • the finished blown containers (2) are fed by further transfer wheels to a delivery line (32).
  • thermoplastic material different plastics can be used.
  • PET, PEN or PP can be used.
  • the expansion of the preform (1) during the orientation process takes place by compressed air supply.
  • the compressed air supply is in a pre-blowing phase in which gas, for example compressed air, is supplied at a low pressure level and subdivided into a subsequent main blowing phase in which gas at a higher pressure level is supplied.
  • gas for example compressed air
  • main blowing phase in which gas at a higher pressure level is supplied.
  • compressed air is typically used at a pressure in the interval of 10 bar to 25 bar and during the main blowing phase compressed air is supplied at a pressure in the interval of 25 bar to 40 bar.
  • the heating section (24) from a plurality of revolving transport elements (33) is formed, which are strung together like a chain and guided by Umlenkyern (34).
  • Umlenkyern (34)
  • a single relatively large-sized guide wheel (34) and in the range of adjacent deflections two comparatively smaller dimension- ied deflecting wheels (36) used.
  • any other guides are conceivable.
  • the arrangement shown to be particularly useful since in the region of the corresponding extent of the heating section (24) three deflecting wheels (34, 36) are positioned, and although in each case the smaller deflection wheels (36) in the region of the transition to the linear curves of the heating section (24) and the larger deflection wheel (34) in the immediate transfer area to the transfer wheel (29) and the input wheel (35).
  • chain-like transport elements (33) it is also possible, for example, to use a rotating heating wheel.
  • a larger amount of preforms (1) per unit time can be tempered by the larger number of radiant heaters (30).
  • the fans (31) introduce cooling air into the region of cooling air ducts (39), which in each case oppose the associated radiant heaters (30) and emit the cooling air via outflow openings.
  • the arrangement of the outflow directions, a flow direction for the cooling air is substantially transverse to a transport direction realized the preforms (1).
  • the cooling air ducts (39) can provide reflectors for the heating radiation in the area opposite the radiant heaters (30), and it is likewise possible to realize cooling of the radiant heaters (30) via the discharged cooling air.
  • Fig. 5 shows schematically a block diagram of the pressurized gas supply.
  • the drawn preform (1) was simultaneously represented on behalf of the container (2) and the container bladder (23).
  • a high pressure compressor (41) provides pressure of an output pressure level, for example, about 40 bar.
  • About one or more pressure transducers (42, 43) takes place in the illustrated embodiment, a pressure reduction to two different supply pressure levels.
  • a mean pressure level here is about 10 to 25 bar, the lower pressure level about 5 to 15 bar and the high pressure level about 20 to 40 bar.
  • the pressure transducers (42, 43) are designed as Reduzierverteilstationen and provided with silencers for derived in the environment of compressed air.
  • About boiler (44, 45, 46) is provided a reservoir volume for the respective pressures, so that even with a clocked pressure removal, the respective pressure level is maintained at least approximately.
  • the controlled compressed gas supply takes place using valves (47, 48, 49).
  • the valves (47, 48, 49) are connected to a controller (50) which coordinates the respective switching times of the valves (47, 48, 49). According to a typical procedure, first after opening the valve (47) blowing of the container (2) with the lower blowing pressure and then after closing the valve (47) and opening the valve (48), a further blowing with the medium pressure. After closing the valve (48) and opening the valve (49), a finished blowing with the higher blowing pressure.
  • Blowing air flowing back from the region of a blowing station (3) back into the region of the medium-pressure supply is reused via the valve (48) at a blowing station following in the course of the process.
  • a pressure variation varying within a tolerance band occurs in the region of the vessels (44, 45).
  • the blown air returned via the return valve (51) is first stored in a boiler (53).
  • the boiler typically has a pressure level above the pressure level provided for the medium pressure supply.
  • a connection is made between the return valve (51) and the boiler.
  • a check valve (54) is inserted, which allows a flow of gas only in the direction of the boiler (53).
  • non-return valves (55, 56) are respectively inserted between the boilers (44, 45) and the valves (47, 48) in order to provide a direction of flow only from the boilers (44, 45) in the direction of the valves (47, 48). to enable.
  • the boiler (53) is connected to the compressor (41) via a valve (57) to assist in initial filling.
  • the compressor (41) is arranged stationarily outside the blowing wheel (25) and connected via a rotary coupling (58) to the pneumatic components on the blowing wheel (45).
  • an air supply unit (59) is also positioned.
  • the controller (50) is connected to pressure sensors (60, 61).
  • the pressure sensor (60) detects the pressure prevailing in the region of the blowing station (3).
  • the pressure sensor (61) measures the pressure in the area of the boiler (53) and thus the currently recirculated pressure.
  • the venting valve (52) preferably delivers the blast air to the environment via a muffler (63).
  • the blowing station (3) with a pneumatic Formhan (64) equipped.
  • a supply pressure for this pneumatic form-locking device (64) is preferably branched off from a pneumatic supply line of the blowing station (3).
  • the actual output of the compressor (41) can be determined with a flow meter (65).
  • the optimization of the blown air return can be set, for example, such that the smallest possible volume flow per unit of time to fresh blown air from the compressor (41) must be provided.
  • Fig. 6 shows an example of a blow pressure curve (66). Plotted is the pressure within the preform (1) or the container (2) or the developing container bladder (23) over time. At a start time, the low blowing pressure (PI) is activated. Typically, in this case, a pressure level of about 10 percent of the final value is reached. At a second time, the mean blowing pressure (PB) is activated. After reaching a typical value of about 40 percent of the final pressure, the higher blowing pressure is activated.
  • PI low blowing pressure
  • PB mean blowing pressure
  • a maximum blowing pressure is carried out at a further time, a beginning of the return of the spent blowing air. After a sufficiently long return period, the residual pressure is vented to the environment. This is typically done at a pressure level of about 60 percent of maximum blowing pressure.
  • the return time is about 40 degrees with a total process angle of 360 degrees and thus about one ninth of the available process time.
  • FIG. 7 is a graph similar to FIG. 6 illustrating the variability of the high pressure (P2) connection timing.
  • the shift of the Zuschaltilias can be done according to different criteria. For example, it is possible to define a minimum supply of fresh blown air as an optimization criterion, which must be provided by the compressor (41). This can be done, for example, under an additional secondary condition of a maximum permissible total process time.
  • Another way to optimize is to change the timing of the beginning of the blown air return.
  • advancing the corresponding time point leads to a shortening of the cooling time for the containers (2).
  • An operator can manually or automatically set an allowable earliest possible beginning of the blown air return via an optical bottle monitor.
  • Fig. 8 shows, starting from the diagram of FIG. 7, a time advance of the ZuschaltZeit matters for the higher pressure (P2).
  • P2 the higher pressure
  • Fig. 9 also shows, starting from the diagram of FIG. 7, a shift of the connection time for the higher blowing pressure (2) to a later date. In this way, the amount of recirculated blown air can be increased, but the time provided for the shaping or cooling of the container (2) is shortened or the overall process time is extended at a predetermined fixed corresponding time.

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

Abstract

L'invention concerne un procédé et un dispositif de moulage par soufflage de récipients (2). Après un conditionnement thermique, une préforme (1) est étirée à l'intérieur d'un moule de soufflage (4) par une barre d'étirage (11) et transformée en récipient (2) sous l'action de la pression de soufflage. Dans un premier temps, on utilise une faible pression de soufflage, fournie par une source à basse pression, suivie d'au moins une pression de soufflage moyenne fournie par une source à moyenne pression et ensuite d'une pression de soufflage plus élevée fournie par une source à haute pression. L'air de soufflage est introduit par le biais d'au moins une soupape de pression de soufflage et, une fois le récipient formé, une partie au moins de l'air de soufflage à haute pression est injectée dans la source à moyenne pression. Lors du formage du récipient, il est possible de faire varier le moment du basculement entre l'application de la pression de soufflage moyenne et l'application de la pression de soufflage plus élevée. Le moment du basculement est déterminé par une commande d'air de soufflage en fonction d'au moins un paramètre.
PCT/EP2012/003500 2011-08-18 2012-08-17 Procédé et dispositif de moulage de récipients par soufflage WO2013023789A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011110962.9 2011-08-18
DE102011110962A DE102011110962A1 (de) 2011-08-18 2011-08-18 Verfahren und Vorrichtung zur Blasformung von Behältern

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WO2013023789A1 true WO2013023789A1 (fr) 2013-02-21

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WO2018114462A1 (fr) 2016-12-23 2018-06-28 Krones Ag Procédé et dispositif pour le moulage par soufflage de récipients présentant une partie de fond mobile
WO2018114427A1 (fr) 2016-12-23 2018-06-28 Krones Ag Procédé et dispositif pour le moulage par soufflage de contenants à l'aide d'une partie inférieure mobile
DE102021127436A1 (de) 2021-10-21 2023-04-27 Krones Aktiengesellschaft Verfahren und Vorrichtung zum Blasformen von Behältnissen mit beweglichem Bodenteil
DE102022122879A1 (de) 2022-09-08 2024-03-14 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Umformen von Kunststoffvorformlingen zu Kunststoffbehältnissen mit geregeltem Druckluftrecycling

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DE102019107013A1 (de) * 2019-03-19 2020-09-24 Krones Ag Blasformmaschine mit Doppelrückschlagventil
EP3888884B1 (fr) 2020-03-30 2022-05-04 Gea Procomac S.p.A. Appareil et procédé de formation aseptique de récipients à partir de parisons en matière thermoplastique
DE102022122878A1 (de) * 2022-09-08 2024-03-14 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Umformen von Kunststoffvorformlingen zu Kunststoffbehältnissen mit geregeltem Druckluftrecycling
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US9713898B2 (en) 2014-04-16 2017-07-25 Khs Corpoplast Gmbh Blowing station with compressed air-operated mold clamp, and method for holding together a blow mold of multipiece design
DE102014010861A1 (de) * 2014-07-25 2016-01-28 Khs Corpoplast Gmbh Volumengesteuerte Blasluftzuführung
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WO2018114462A1 (fr) 2016-12-23 2018-06-28 Krones Ag Procédé et dispositif pour le moulage par soufflage de récipients présentant une partie de fond mobile
WO2018114427A1 (fr) 2016-12-23 2018-06-28 Krones Ag Procédé et dispositif pour le moulage par soufflage de contenants à l'aide d'une partie inférieure mobile
EP3558631B1 (fr) 2016-12-23 2021-10-27 Krones AG Procédé et dispositif pour le moulage par soufflage de récipients présentant une partie de fond mobile
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US11554527B2 (en) 2016-12-23 2023-01-17 Krones Ag Method and apparatus for blow moulding of containers with a movable base part
DE102021127436A1 (de) 2021-10-21 2023-04-27 Krones Aktiengesellschaft Verfahren und Vorrichtung zum Blasformen von Behältnissen mit beweglichem Bodenteil
DE102022122879A1 (de) 2022-09-08 2024-03-14 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Umformen von Kunststoffvorformlingen zu Kunststoffbehältnissen mit geregeltem Druckluftrecycling

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