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EP3294526A1 - Procédé de thermorégulation non homogène de préformes - Google Patents

Procédé de thermorégulation non homogène de préformes

Info

Publication number
EP3294526A1
EP3294526A1 EP16715239.6A EP16715239A EP3294526A1 EP 3294526 A1 EP3294526 A1 EP 3294526A1 EP 16715239 A EP16715239 A EP 16715239A EP 3294526 A1 EP3294526 A1 EP 3294526A1
Authority
EP
European Patent Office
Prior art keywords
preform
preforms
thread
container
heating
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Withdrawn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
EP16715239.6A
Other languages
German (de)
English (en)
Inventor
Alexander Schill
Bernhard Orlich
Arne Wiese
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.)
Henkel AG and Co KGaA
KHS GmbH
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA, KHS Corpoplast GmbH filed Critical Henkel AG and Co KGaA
Publication of EP3294526A1 publication Critical patent/EP3294526A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6454—Thermal conditioning of preforms characterised by temperature differential through the preform thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • 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
    • B29C49/62—Venting 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
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/024—Combined blow-moulding and manufacture of the preform or the parison not using inherent heat of the preform, i.e. 2 step 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0773—Threads
    • B29C2949/0774—Interrupted threads
    • 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
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/0795—Parts to assist orientation of preform, e.g. in mould
    • B29C2949/0796—Parts to assist orientation of preform, e.g. in mould at neck portion
    • 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
    • B29C49/42113—Means for manipulating the objects' position or orientation
    • B29C49/42119—Rotation, e.g. rotating a predetermined angle for asymmetric preform or with asymmetric heat profile
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6458—Thermal conditioning of preforms characterised by temperature differential tangentially, i.e. along circumference
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to a method for the inhomogeneous temperature control of preforms made of a thermoplastic material, wherein the preforms are provided for blow molding in containers, wherein the preform is provided along a circumference with a temperature profile which is generated by areas in the radial circumferential direction of the preform be heated differently.
  • the preforms are generally rotationally symmetrical about their longitudinal axis.
  • the temperature conditioning of the preforms is carried out by heating, e.g. by transporting the preforms through a heating section. During the heating process, the preforms are provided along a circumference with a temperature profile.
  • Such a method is used, for example, when containers are to be produced from the preforms whose cross section deviates from a circular shape.
  • the deviation may be, for example, to produce containers with an oval cross-section or, for example, with a triangular or quadrangular cross-section.
  • 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.
  • CONFIRMATION COPY takes place by means of compressed air, which is introduced into the preform to be expanded.
  • 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 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 plugged, has proven to be useful.
  • the preforms can also be handled with other support devices.
  • the use of gripper tongs for handling preforms and the use of expansion mandrels which are insertable into a muzzle region of the preform for mounting are also 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.
  • 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.
  • relatively movable or differently guided mold carrier For fixed blowing stations, which are particularly suitable for multiple cavities for Container forming, typically parallel plates are used as a mold carrier.
  • preform alignment it is known to arrange these, for example, on support mandrels, and to align the support mandrels at the inlet into the heating section, for example by means of projections formed on the support mandrels, which interact with an alignment structure along which the support mandrel runs along its transport path.
  • this does not yet ensure that the preform is oriented in the desired thread orientation on the mandrel.
  • One way to solve the problem described would be to modify the standard thread of a preform by an additional alignment structure is formed in the threaded area, which cooperates with an alignment, on which the preform is guided along its transport path, for example when entering the heating section.
  • the object of the present invention is therefore to provide a method of the initially mentioned type, which provides the possibility for the desired alignment of the preforms in a simple manner and to show an alternative to the prior art, which avoids the disadvantages mentioned.
  • the term standard thread includes preform threads having a cylindrical basic shape on which the thread ridges extend radially outwardly as bumps. The thread ridges have edge surfaces transverse to the ridge profile, ie in the direction of the longitudinal axis of the preform.
  • Such edges in the thread threads of standard threads are, for example, the thread inlet, the thread outlet or so-called venting slots, which extend in alignment over several thread runs.
  • These threads, referred to as standard threads for the purposes of this application are therefore already used, for example, in preforms which are to be blow-molded into containers of round cross section, in which case no alignment in the manner explained is required. It is just sense of the present Invention to be able to use conventional preforms without modifications in the threaded area.
  • edges are generally inclined relative to the surface normal of the cylindrical basic shape of the preform, that is to say the edges are generally not perpendicular to the cylinder surface in the radial direction but are inclined out of the 90 ° position by an angle .
  • alpha preferably ⁇ is between 0 ° and 60 °, more preferably between 0 ° and 45 °, particularly preferably less than 30 °.
  • the preform is held during the heating process by a follower support member.
  • the preform can be attached, for example, to a transport mandrel. This can be done, for example, in the inlet region of a heating section.
  • a transport mandrel This can be done, for example, in the inlet region of a heating section.
  • support elements there are also other support elements conceivable. It is also conceivable to bring the support element and the preform together only when the inhomogeneous temperature control of the preform is to take place. It is conceivable, for example, that first of all the preform is heated homogeneously in order then to make an impression of the desired inhomogeneous heating profile in a closing section of a heating section.
  • the preform is heated homogeneously, in order then to make an impression of the desired inhomogeneous heating profile, for example in a clocked, stationary heating element.
  • the use of support elements has the advantage that the support elements can be made optimized for handling, while preforms are made as material-saving and handling in the heating section on the preform itself is problematic.
  • the support element is aligned and also the preform is aligned. If both have taken the desired aligned position, the two can be connected to each other, for example, positionally stable, as is known for example by conventional clamping mandrels.
  • the desired orientation of the thread correlates with the orientation of the support element, so that in subsequent treatment steps, the orientation of the support element and the orientation of the preform conditional.
  • insertion into a blowing station in the desired orientation can take place without having to pay attention to the alignment of the preform again.
  • the transport mandrel or other support element is used together with the preform in the blowing station.
  • the preform itself could be actively rotated to align the preform. Since preforms material use optimized and manufactured with the least possible cost of materials, it proves to be advantageous if the rotation of the preform takes place by the support member is rotated, which carries the preform.
  • Fig. 1 is a perspective view of a blowing station for the production of
  • Fig. 2 is a longitudinal section through a blow mold in which a preform is stretched and
  • FIG. 3 is a sketch to illustrate a basic structure of a
  • Device for blow-molding containers 4 shows a modified heating section with increased heating capacity
  • FIG. 7 is a plan view of a container with an oval cross-section
  • FIG. 8 is a plan view of a container with oval cross section and asymmetrically arranged mouth
  • FIG. 9 shows a cross section through a blow mold, in which a container with an oval
  • Fig. 10 is a timing chart for illustrating a timing of a
  • FIG. 11 is a schematic diagram for illustrating a selective cooling of a preform
  • FIG. 12 shows a schematic illustration for illustrating a temperature conditioning of preforms by alternately arranged heating boxes in non-rotating preforms
  • FIG. 13 shows a sketch for illustrating a temperature conditioning of a preform by different activation of heating devices
  • FIG. 14 shows a perspective and a sectional view of a preform held by a transport mandrel with an aligning element according to a first embodiment
  • FIG. 15 is a perspective and a sectional view analogous to FIG. 14 with an alignment element according to a second embodiment, and 16 shows the inlet region of a heating section in an enlarged view with alignment elements for transport mandrels and for preforms, and
  • Fig. 17 is an enlarged view of the threaded portion of a standard preform
  • PCO 1881 and a section through the threaded portion perpendicular to the longitudinal axis of the preform at the level of the thread outlet.
  • FIGS. 1 and 2 The basic structure of a device for forming preforms (1) in container (2) is shown in FIGS. 1 and 2. On the basis of these figures, the process of blow molding of containers (2) from preforms (1) should be explained only in a fundamental way.
  • the illustrated apparatus 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) typically consists of mold halves (5, 6) and a bottom part (7) made of a lifting device (8) can be positioned, namely lowered and raised in the present example.
  • 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.
  • preform (1) for example via pliers or other handling means directly into the blow mold (4).
  • the blow molding takes place from preforms pointing downwards with the mouth.
  • Blow molding stations are likewise common, into which preforms with an upward-directed mouth are inserted.
  • a connecting piston (10) is arranged, which feeds the preform (1) compressed air and at the same time performs a seal relative to the transport mandrel (9).
  • a connecting piston (10) is arranged, which feeds the preform (1) compressed air and at the same time performs a seal relative to the transport mandrel (9).
  • a stretching of the preform (1) takes place in this embodiment by means of a A stretching rod (11) positioned by a cylinder (12).
  • a mechanical positioning of the stretching rod (11) is carried out over curved segments which are acted upon by picking rollers.
  • the use of curve segments is particularly useful when a plurality of blowing stations (3) are arranged on a rotating blowing wheel.
  • stretching rods with linear motor drive are also known in the art.
  • 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).
  • the carriers (19, 20) are locked relative to one another by means of a locking device (20).
  • Fig. 2 shows in addition to the blown container (2) and dashed lines drawn the preform (1) and schematically a developing container bladder (23).
  • Fig. 3 shows a general understanding of the technical environment of the invention, 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) of transfer wheels (27, 28, 29) in the range of Heating section (24) transported.
  • 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) designed, for example, as illustrated in FIGS. 1 and 2, 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 is carried out by compressed air supply.
  • the compressed air supply is in a Vorblasphase in which gas, for example, compressed air, is supplied at a low pressure level and divided into a subsequent Hauptblasphase in which gas is supplied at a higher pressure level.
  • 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) is formed of a plurality of rotating transport elements (33) which are strung together like a chain and guided by guide wheels (34). In particular, it is thought to open up a substantially rectangular basic contour by the chain-like arrangement.
  • a single relatively large-sized guide wheel (34) and in the region of adjacent deflections two comparatively smaller dimensioned guide wheels (36) used In principle, however, 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.
  • a flow direction for the cooling air is realized substantially transversely to a transport direction of 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.
  • heaters are also to be understood as examples only.
  • a variety of alternative constructions are known in the art, e.g. designed as heating wheels constructions with single place heating.
  • Other heating methods are known in the art, e.g. Heating the preforms by microwave irradiation.
  • the invention is independent of the actual appearance of the heaters and regardless of the heating method.
  • a preform (1) typically and according to the embodiment in FIG. 5 consists of a mouth portion (52), of which the mouth portion (52) of a Neck region (53) separating support ring (54), which is also referred to as a neck ring, from a neck region (53) in a wall portion (55) passing shoulder region (56) and from a bottom (57).
  • the support ring (54) projects beyond the mouth portion (52) transversely to a longitudinal axis (58) of the preform (1).
  • the outer diameter of the preform (1) widens starting from the neck region (53) in the direction of the wall section (55).
  • the wall section (55) In a container (63) to be produced from the preform (1), the wall section (55) essentially forms the side wall of the container.
  • the bottom (57) is rounded.
  • the mouth section (52) can be provided, for example, with an external thread (62) which makes it possible to attach a screw cap to the finished container (63). But it is also possible to provide the mouth portion (52) with an outer bead to provide a surface for a crown cap. In addition, a variety of other designs are possible to allow placement of plug-in closures. There are a variety of standardized threads known. In Fig. 17, such a standardized thread (62) is shown in an enlarged view.
  • the wall portion (55) has an inner surface (59) and an outer surface (60).
  • the inner surface (59) defines a preform interior (61).
  • the thickness of a preform wall (64) can extend from the neck region (53) in the direction of the wall region (55) with increasing wall thickness.
  • the preform (1) has a preform length (65).
  • the mouth region (52) and the support ring (54) extend with a common mouth length (66).
  • the neck region (53) has a neck length (67) in the region of the longitudinal axis (58).
  • the preform (3) preferably extends with a constant wall thickness.
  • the preform (1) has a wall thickness (68) and in the region of the bottom (57) a bottom thickness (69) can be found. Further dimensioning of the preform (1) by means of an inner diameter (70) and an outer diameter (71) measured in the approximately cylindrical wall portion (55).
  • the mouth portion (52) and the support ring (54) are substantially unchanged.
  • the further region of the container (63) is expanded by the performed biaxial orientation both in the transverse direction and in the longitudinal direction relative to the preform (1).
  • the container (63) has a container length (72) and a container diameter (73) which, in view of the accuracies to be taken into account, is not to be distinguished below with regard to the specific inside diameter or outside diameter.
  • Fig. 6 shows, among other things, the bottom portion of the blow-molded container (63).
  • the container (63) has a side wall (74) and a container bottom (75).
  • the container bottom (75) consists of a base ring (76) and a dome (78) curved inward in the direction of a container interior (77).
  • the dome (78) is formed of a dome slope (79) and a center (80).
  • the container (63) has a container mouth length (81) and a container neck length (82), wherein at least the container mouth length (81) is typically equal to the mouth length (66) of the preform (1).
  • a heating of the preform (1) before the orientation process is conceivable in different variations.
  • the temperature is controlled only as a function of the residence time.
  • radiant heaters which act on the preform (1) with infrared or high frequency radiation. With the aid of such radiators, it is possible to produce a temperature profile in the region of the preform (1) in the direction of the longitudinal axis (58) or in the circumferential direction.
  • the upper extent of the preform (1) can be intensified by intensifying activation of the heating elements in the area towards the mouth section (52). in the thickened region of the wall section (55) a higher Heat energy are irradiated, as in the region of the Wandungsabêtes (55), which faces the bottom (7).
  • a heat profiling can also be realized by an arrangement of the heating elements with different distances in the direction of the longitudinal axis (58).
  • Fig. 7 shows a cross section through a container (63) with non-circular cross-sectional area in the form of an oval. There is thus no constant container diameter (73), but the container diameter (73) lies, depending on the measuring direction, between a minimum container diameter (83) and a maximum container diameter (84).
  • the mouth section (52) of the container (63) is arranged substantially centrally.
  • the container (63) has a similar design as the container (63) according to FIG. 7. However, the mouth portion (52) is staggered with respect to a container centerline (85).
  • FIG. 9 shows a horizontal section through a preform (1) arranged in the region of a heating device (86). It can be seen that the heating device (86) has a radiant heater (87) and a reflector (88). A periphery (89) of the preform (1) is divided into four angular regions (90, 91, 92, 93) in this embodiment. In the direction of the circumference (89), the temperature control of the angular regions (90, 91, 92, 93) should take place differently. To produce a container (63) with a contour according to FIG. 7, it is expedient, for example, to temper the angular regions (90, 92) as well as the angular regions (91, 93) at least approximately the same.
  • the angular regions (90, 92) with a higher temperature than the angular regions (91, 93) when an oval container (63) is to be produced.
  • the size of the respective angular regions (90, 91, 92, 93) depends on the design of the blow-molded container (63).
  • the preform (1) is thus rotated by about 80 °.
  • the preform (1) it is initially possible to temper the preform (1) in advance uniformly and then to generate the temperature profile with the aid of the described movement. It is also possible to provide a movement sequence of the preform (1) during the rotation in such a way that, starting from a cold preform (1), the temperature profile is achieved by the respective movement phases. At least in the case of a temperature profiling following a pre-tempering, the movement sections (95) are considerably shorter in terms of time than the rest sections (96). The ratio of the durations may be 1:10, for example.
  • Fig. 11 shows a further possibility for applying a temperature profile.
  • a preheated preform (1) is thereby moved in step mode in front of a cooling nozzle (103), which emanates a cooling gas.
  • a cooling gas For example, air can be used.
  • the preforms (1) are passed between heating devices (86) arranged alternately on opposite sides of the transport path. In this case, no rotation of the preforms (1) is provided, but the stepwise heating is realized by the successive heating zones on each side of the transport path. The gap on the opposite arrangement is avoided that the heaters radiate into each other. When using suitable cooling, however, it is also possible to realize an opposing arrangement or a partially overlapping oppositely staggered arrangement.
  • Fig. 13 shows another variant.
  • the preforms (1) are moved here both in the transport direction (104) and in the direction of rotation (105).
  • the heating devices (86) are connected to a heating control (106), which controls the heating devices (86) arranged one behind the other in the transport direction (104) in such a way that the desired temperature profile in the preforms (1) moved past Circumferential direction is generated.
  • a heating control 106
  • the finished blown container (2) is e.g. after filling a closure put on. If the orientation of the closure to the blow-molded container (2) is not critical, it is also uncritical how, during the inhomogeneous heating, the preform (1), more precisely the thread (62) of the preform (1), is aligned. If the blow-molded container (2) is rotationally symmetrical with respect to its longitudinal axis (58), uncritical relationships with respect to the thread orientation are likewise present when the temperature profile in the heating section (24) is impressed. However, this changes when the closure is to be in a predetermined manner to the finished blow-molded, non-rotationally symmetrical container (2), e.g.
  • blow-molded container (2) has an oval cross-section, that is, has preferential directions with respect to which the closure is to be in a predetermined manner.
  • This is known e.g. for spray bottles with closures with manually operated spray nozzles.
  • the hand actuator be oriented in a particular direction with respect to the spray bottle body.
  • FIG. 14 shows a perspective and a sectional view of a preform (1) held by a transport mandrel (9) with an alignment element (140) according to a first embodiment variant
  • FIG. 15 shows a second embodiment variant with views analogous to FIG. 14. Since the two variants differ only in the alignment elements (140, 150), which engage in different structures of the otherwise identically formed thread (62), and otherwise formed in the same way, both figures are described simultaneously and then on the respective differences Connection be received.
  • the preform (1) is held with the mouth region facing downwards by a transport mandrel (9).
  • This transport mandrel (9) has at its bottom end to an eccentrically arranged alignment pin (141), which as later explained to Fig. 16 for the alignment of the transport mandrel (9) is used.
  • the transport mandrel (9) on a gear (142) which projects beyond the other area of the transport mandrel (9) and the radially for example, the transport of the dome (9) and cooperates with a transport chain.
  • the thread of the preform (1) is an example of a standard thread, namely a thread named PCO 1881, which is shown in an enlarged view in FIG.
  • This thread has, among other so-called venting slots (143), which can be seen in particular in the sectional view in the left half of Fig. 14 and in Fig. 17.
  • venting slots (143) There are a total of four venting slots (143) visible extending in the longitudinal direction (58) of the preform (1) over the entire thread length to allow ventilation when a screwed lid is unscrewed.
  • the venting slots (143) are bounded by lateral faces of the thread pitches (173) interrupted by the venting slots (143). These faces are suitable contact surfaces.
  • the alignment member (140) holds the preform (1) so that the mandrel (9) can rotate relative to the retained preform (1). Before reaching this position, the preform (1) rotates together with the mandrel (9).
  • the alignment member (140) is preferably formed into a radial suspension and has at its in the preform thread (62) engaging portion a narrow engagement blade which is dimensioned so that it can engage between adjacent thread pitches (173) and upon reaching a certain alignment position of the preform (1) abuts against an end face of a venting slots (143).
  • the alignment element (150) of FIG. 15 is formed.
  • the threaded outlet (171) serves as a contact surface for the alignment element (150).
  • the alignment element (150) has at its engagement region in the preform thread (62) two narrow blades arranged one above the other at a distance from each other. Between these two blades extends a recess in which the thread runs (173) of the preform thread (62) can slide along until the blades abut the threaded outlet (171). At this time, a rotation of the preform (1) is stopped, so that, for example, a rotationally driven mandrel (9) can continue to rotate, the preform (1) but his attained alignment position maintains.
  • the thread inlet (172) can serve as a contact surface for the alignment element (150).
  • Fig. 16 shows the inlet region of a heating section (24) in an enlarged view with alignment elements for transport mandrels (9) and preforms (1).
  • the transport mandrels (9) run in with preforms (1) placed thereon.
  • a base-side alignment rail (160) with a recess (161) tapering in the transport direction ensures that the mandrels (9) are aligned by means of the alignment pin (141, 151) formed thereon.
  • the Ausrichtrad (165) has rotating with the wheel alignment elements (166), which can be radially swiveled cam-controlled.
  • the mandrels (9) are rotationally driven and the alignment elements (166) upon reaching a certain rotational position of the alignment wheel (165) are pivoted radially into an engagement position, so that an engagement in the threaded portion of the preform (1).
  • the transport mandrel (9) and the parison (1) held thereby rotate until the alignment member (166) abuts the predetermined abutment surface of the thread (62).
  • This may be, for example, a venting slot (143) or the thread outlet (171) or the thread inlet (172) according to the embodiment variants of FIGS. 14 and 15.
  • the Ausrichtrad (165) for example, the heating section (24) upstream or be part of the heating section (24).
  • the thread (62) of the preform (1) and the alignment pin (141) of the dome (9) are the thread (62) of the preform (1) and the alignment pin (141) of the dome (9) in a predetermined and desired orientation to each other.
  • the transport mandrel (9) for example, formed by clamping
  • the clamping forces are to be dimensioned so that in trouble-free operation of the machine, the preform (1) in the aligned position is held firmly in position to the mandrel (9).
  • the mandrel (9) and preform entity (1) may then be transported together through the blow molding machine, such that the alignment pin (141) of the mandrel (9) may be used to align the thread (62) of the preforms, for example.
  • Fig. 17 can be seen in the lower sectional view that the candidate contact surfaces (venting slots, thread inlet, threaded outlet) are generally inclined to the surface normal (174) of the cylindrical basic shape of the preform (1).
  • the example of the thread outlet (171) shows that an inclination by an angle ⁇ is usually provided.
  • the thread inlet (172) and the thread outlet (171) are further defined by radii R1 and R2 and by a height h. It is preferred that these quantities are related in a particular way, namely that R1 and / or R2 are less than 2 of h, more preferably less than 1/3 of h. This is preferred regardless of the specific thread type for each standard thread. Furthermore, it is preferred for each thread type, if between the radii R1 and R2 extends a linear edge region I, preferably I> 10% of h, more preferably greater than 20%, even more preferably greater than 30%.

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

Abstract

L'invention concerne un procédé de thermorégulation de préformes (1) symétriques en rotation autour de leur axe longitudinal, présentant un filetage standard, et composées d'un matériau thermoplastique. Pour le moulage par soufflage, les préformes (1) sont placées dans des récipients (2) de section transversale non circulaire en coupe transversale par rapport à l'axe longitudinal (58) du récipient, et chauffées pour leur conditionnement thermique. Pendant le processus de chauffage, la préforme (1) est munie le long d'une circonférence d'un profil thermique qui est produit du fait que, dans la direction circonférentielle radiale de la préforme (1), certaines zones sont chauffées différemment, le filetage (62) de la préforme (1) étant orienté dans une position théorique prédéterminée avant que lesdites zones ne soient chauffées différemment. Le procédé est caractérisé en ce que pour son orientation, la préforme (1) est mise en rotation et un élément d'orientation (140, 150) vient en prise avec le filetage standard (62) et empêche la préforme (1) de continuer à tourner dès que l'élément d'orientation (140, 150) vient en appui dans le filetage standard (62) par rapport à une surface d'appui (143, 171, 172) préalablement déterminée.
EP16715239.6A 2015-05-08 2016-04-07 Procédé de thermorégulation non homogène de préformes Withdrawn EP3294526A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015005769.3A DE102015005769A1 (de) 2015-05-08 2015-05-08 Verfahren zur inhomogenen Temperierung von Vorformlingen
PCT/EP2016/000568 WO2016180510A1 (fr) 2015-05-08 2016-04-07 Procédé de thermorégulation non homogène de préformes

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EP3294526A1 true EP3294526A1 (fr) 2018-03-21

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US (1) US20180264707A1 (fr)
EP (1) EP3294526A1 (fr)
JP (1) JP6539751B2 (fr)
CN (1) CN107548344A (fr)
DE (1) DE102015005769A1 (fr)
WO (1) WO2016180510A1 (fr)

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FR3103131B1 (fr) * 2019-11-20 2021-11-05 Sidel Participations "Procédé d'orientation d'une préforme dans un moule"
EP4596226A3 (fr) * 2021-06-29 2025-10-01 Discma AG Procédé de chauffage d'une préforme appropriée pour un moulage par soufflage
EP4363195B1 (fr) * 2021-06-29 2025-07-09 Discma AG Procédé d'imagerie thermique pour un procédé de moulage par soufflage
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DE102022100090A1 (de) 2022-01-04 2023-07-06 Khs Gmbh Heizverfahren und Heizvorrichtung zur thermischen Konditionierung von Vorformlingen mit temperaturausgezeichneten Umfangsbereichen (preferential heating)
DE102022105331A1 (de) * 2022-03-08 2023-09-14 Krones Aktiengesellschaft Verfahren und Vorrichtung zum Herstellen von Kunststoffbehältnissen mit nicht kreisförmigem Querschnitt
DE102022109816A1 (de) * 2022-04-22 2023-10-26 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Herstellen von Kunststoffbehältnissen mit nicht kreisförmigen Querschnitten
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WO2016180510A1 (fr) 2016-11-17
CN107548344A (zh) 2018-01-05
US20180264707A1 (en) 2018-09-20
DE102015005769A1 (de) 2016-11-10
JP6539751B2 (ja) 2019-07-03
JP2018515370A (ja) 2018-06-14

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