US20170291334A1 - Method and device for the production of an optimized neck contour on preforms - Google Patents

Method and device for the production of an optimized neck contour on preforms Download PDF

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Publication number
US20170291334A1
US20170291334A1 US15/513,075 US201515513075A US2017291334A1 US 20170291334 A1 US20170291334 A1 US 20170291334A1 US 201515513075 A US201515513075 A US 201515513075A US 2017291334 A1 US2017291334 A1 US 2017291334A1
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United States
Prior art keywords
preform
neck
embossing
cooling
mold
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Abandoned
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US15/513,075
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English (en)
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Mahir Aktas
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Individual
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Individual
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    • 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
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/08—Injection moulding
    • 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
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/0055—Shaping
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1773—Means for adjusting or displacing the injection unit into different positions, e.g. for co-operating with different 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • B29C45/2632—Stampers; Mountings thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded 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
    • B29C49/02—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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • 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
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0723—Preforms or parisons characterised by their configuration having variable wall thickness at flange 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
    • B29C2949/0745—Preforms or parisons characterised by their configuration having ribs or protrusions at flange 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/42421—Means for deforming the parison prior to the blowing operation before laying into the mould
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/42421—Means for deforming the parison prior to the blowing operation before laying into the mould
    • B29C49/42422—Means for deforming the parison prior to the blowing operation before laying into the mould by the preform transporting 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
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6465—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6466—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6467—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on 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
    • B29C49/76—Neck calibration
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • 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 present invention relates to a method and an apparatus for the production of preforms for forming an advantageous neck geometry for the subsequent blow-molding process.
  • Preforms are injection-molded blanks which are made of at least one thermoplastic material and are used in blow-molding machines for producing stretch-blow-molded polymer-material containers.
  • raw plastic material is plasticized and then pressed under high pressure into a mold having one or more cavities.
  • preforms according to FIG. 1 which, in geometrical terms, comprise essentially a neck and stem region and a domed base and are hollow on the inside as a result of a core being used in the mold.
  • the neck region is formed such that it can be configured for reclosure for example by means of a screw cap.
  • the neck region must not undergo any further alteration above the transporting ring during the blow-molding process, since otherwise there is a risk of the closure system losing its complex capabilities, e.g. its sealing function.
  • the region beneath the transporting ring, the adjoining stem region and the domed base are inflated at elevated temperatures to form hollow bodies, as a result of which the plastic material is stretched and, in the process, solidifies to a considerable extent. It is therefore the case that the preform regions which are to be deformed are responsible in geometrical terms, along with the core geometry, for the bottle quality which is subsequently established.
  • the temperature profile between the neck and the stem would have to make an abrupt temperature jump of approximately 50-80° C., although this is difficult to realize nowadays. In most cases, this means, that as a result of a gradual temperature transition, the material beneath the transporting ring cannot be optimally drawn off into the bottle body during the stretch-blow-molding process, and this results in unnecessary material consumption.
  • the mold which constitutes the highest level of investment in a production system. It is therefore important for the mold to be operated efficiently. Consequently, the preform, of which the outer skin is in direct contact with the intensively cooled mold steel, and therefore solidifies quickly there, is demolded without sustaining damage or mechanical deformation, so that the mold is ready for the next production cycle without any time being wasted.
  • the preform as is illustrated in FIG. 1 corresponds to the current prior art, in the case of which it is inevitable for the wall thicknesses of the preform, particularly in the region of the domed base and of the stem, to be similar. If the material freezes prematurely as a result of thinner wall thicknesses in the injection region or in the neck region, it is not possible to avoid shrinkage in the cooling phase as a result of the melt being subjected to holding pressure, this having an effect on the entire preform including the neck region, and this all consequently results in undesired sink marks in critical regions of the preform, particularly in the neck region.
  • the preform geometry as is shown in FIG. 2 the advantages of which will be explained hereinbelow, therefore cannot be produced by the known injection-molding method—or only if appropriate measures are taken in order to maintain the necessary holding pressure—since, for this invention, it is desired to have a significantly thinner wall thickness in the region of the neck beneath the transporting ring than in the following threaded region, and it is therefore no longer possible to avoid sink marks as a result of said thin region freezing prematurely.
  • the central object of the present invention is that of describing a method and an apparatus which make it possible to produce preforms with significantly more advantageous contours beneath the transporting ring.
  • the advantage resides in the fact that the infrared heaters of the downstream blow-molding machines can introduce heat energy more efficiently over this now enlarged surface area with the simultaneously reduced wall thickness, in order to bring the plastic material quickly to a temperature at which it can be stretched. Therefore, during the operation of heating the preform, more attention can be paid to the neck itself, which must not be heated—the temperature jump from the cold neck region to the hot preform body should be as abrupt as possible. It is thus possible, during the stretch-blow-molding operation, to draw out the material directly beneath the transporting ring in optimum fashion to the benefit of the bottle body, which allows the amount of raw materials used to be reduced.
  • the preform such that most of the neck-transition region is actually thin-walled—but at least two or more channels are created, and these channels do not freeze prematurely and therefore maintain the holding pressure in relation to the neck.
  • These channels are manifested on the finished injection molding in the form of ribs, which have no adverse effect on the subsequent blow-molding operation—provided they are distributed as symmetrically as possible over the circumference.
  • An alternative, second approach described here by the invention is that of implementing, within the mold, at least two slides, which, as far as possible at the end of the holding-pressure phase, realize the thin contour beneath the transporting ring when still in the injection mold.
  • a favorably selected timing would even result in the displacement process assisting the holding pressure.
  • This solution also produces ribs, as a result of the parting locations of the slides; the number of ribs is in direct proportion to the number of slides used. It is possible, however, for said ribs to be significantly thinner than the ribs which are necessary for the straightforward injection-molding solution above, since the freezing of the melt in the ribs is then no longer of any import.
  • a third approach for rendering the preform according to this invention thin beneath the neck region can be realized during the post-cooling operation and is based on the fact that there is residual heat, which results in the preform softening again.
  • the desired contour can be introduced by embossing.
  • the preform stem and the preform dome are cooled in the cooling sleeve by contact cooling, the region between the preform stem and transporting ring then, as a result of the cooling-sleeve function being modified, is excluded from the cooling contact, as a result of which, at this location, a temperature of approximately 90-130° C. can be established as a result of reheating and said location is thus deformable again.
  • the basic idea of this part of the invention is that the modified function of the cooling sleeve, which rules out direct contact with the preform region beneath the transporting ring, precludes intensive cooling there and thus allows for reheating. Following a conditioning period of a few seconds, the preform region beneath the transporting ring is at a temperature level at which it is most easily deformable.
  • embossing elements which are produced from solid material, for example from tool steel, are arranged such that they can apply high embossing forces as a result of straightforward axial movement.
  • Embossing is understood to mean that the plastic material is deformed by pulling, pressing and pushing operations in the manner predefined precisely by the embossing elements.
  • a further possible way of influencing the precision of the embossing operation in said preform region is that of actively temperature-controlling the embossing bodies.
  • the embossing operation can be understood, in principle, to mean that the embossing elements press the soft plastic material onto a hard cylinder, which rules out any inner deformation of the preform.
  • the plastic material therefore yields upward and downward, as a result of which the preform can lengthen to an insignificantly reproducible extent when the regions above and beneath the embossing location are freely movable in the axial direction.
  • this method in direct dependence on the number of embossing parts, has slight ribs, since said embossing parts have geometrical divisions in their contour which are replicated on the preform neck.
  • the embossing method has basically no influence on the production-cycle time, since the time taken for injection molding in the mold is longer than the embossing operation itself.
  • FIG. 1 shows a cross section of a preform as is conventionally produced according to the prior art
  • FIG. 2 shows a cross section of a preform in which the region beneath the transporting ring has been configured using different methods following or during the injection-molding process in the mold, or in the post-cooling station, and the wall thickness there can thus be decreased more or less as desired,
  • FIGS. 3-6 show schematic views of the post-cooling unit, in which the embossing elements have been integrated and from which it can be seen how the embossing forces can be applied,
  • FIG. 7 shows the schematic illustration, as seen from the outside and from the side, of the flow paths on the wound-up preform neck
  • FIGS. 8 a and 8 b show the use of slide inserts for producing relatively thin wall thicknesses in the mold following or during the filling operation
  • FIG. 9 shows a plan view of an example of a production arrangement for preforms.
  • FIG. 1 shows a preform produced according to the prior art.
  • Said preform may have a transporting ring 3 for further container-production steps—it may also be possible in the future, however, to dispense with said transporting ring 3 , since it is possible, if appropriate, to grip the region between the ribs of the preform.
  • the wall thickness in the region beneath the transporting ring 3 here has a similar wall thickness 12 as the threaded region 15 .
  • This invention discloses three solution-related approaches as to how the preform in FIG. 2 can be produced. It should be mentioned here, however, that all three methods produce at least two ribs or channels 14 on the circumference of the preform region described, but said ribs or channels have no adverse effect on the desired result.
  • the mold 17 is configured such that at least two, and even better three, channels 14 of sufficient width, as in FIG. 7 , are provided over the thin wall 9 beneath the preform neck 15 , said channels ensuring that the holding pressure in the neck region 15 is maintained.
  • sliding elements 13 are integrated in the mold 17 , as illustrated in FIG. 8 a and FIG. 8 b , said sliding elements then being used at the optimum point in time of the injection-molding process. These elements press the still soft polymer material in the mold into regions which are less critical for the blow-molding process and, in doing so, possibly assist the holding-pressure phase.
  • the removal arm 18 here has a multiplicity of cooling sleeves 8 , in which the preform according to FIG. 1 is introduced as far as the neck region 15 .
  • FIGS. 3 to 6 Such a cooling sleeve 8 is illustrated in FIGS. 3 to 6 .
  • the initially produced preform according to FIG. 1 has a conventional shape with a relatively thick wall thickness in the region beneath the transporting ring 3 and has its outer body region accommodated, with a virtually full, direct contact, in a water-cooled cooling sleeve 8 .
  • the left-hand preforming position illustrated in FIG. 3 shows that the cooling sleeve 8 , in the upper region, has embossing elements 5 , which are mounted on springs 6 and are secured by screws.
  • the preform 1 has its transporting ring 3 resting on the embossing elements 5 and thus has not yet reached its axial end position in the cooling sleeve 8 . If the preform does not have a transporting ring 3 , it is then possible, as an alternative, for the preform 1 to be brought into this position by a movable, spring-mounted base support 11 on its domed base.
  • the embossing elements 5 are not yet in shaping abutment against the preform 1 , as a result of which this region can reheat on account of contact cooling being absent.
  • the number of cooling sleeves 8 may be a multiple of the number of cavities in the mold 17 . It is thus possible for the residence time of the preform 1 or preform 2 in the cooling phase to continue for a number of injection-molding cycles.
  • a removal arm 18 removes the preforms from the mold region.
  • the removal arm 18 here assumes such a position that the mouth openings of the last-produced number of preforms 1 are located opposite a transporting plate, on which are mounted supporting pins 4 and bell-shaped pressure-exerting members 7 in a number equal to the number of preforms, can be aligned axially.
  • the transporting plate On account of the high level of force which is then required, it is possible for the sake of simplicity for the transporting plate to be mounted directly on the moving platen. However, it could also be an independently movable unit.
  • the supporting pin 4 is provided essentially so that, when the removal gripper 18 is brought together with the transporting plate, the preform 1 is centered and, during the following embossing operation by the embossing elements 5 , deformation of the internal diameter of the preform is for the most part avoided.
  • the embossing operation itself is initiated with the same action of the removal gripper 18 being brought together with the transporting plate, during which the embossing elements 5 are subjected to the necessary force by way of the bell-shaped pressure-exerting element 7 .
  • the actual embossing forces are produced by the conical mounting of the embossing elements 5 , which thus move by a geometrically predefined displacement amount in relation to the preform axis.
  • the angle and the length of the cone are selected in accordance with the amount of force required for embossing purposes.
  • the force and the point in time for the actual embossing operation can be defined by a dedicated overall drive of the transporting plate. If the transporting plate, however, is connected directly to the moving platen of the injection-molding machine, it is necessary to use individual axial drives if the point in time for the embossing operation is to be delayed.
  • the preforms according to FIG. 1 are mounted in the inner contour of the cooling sleeve 8 such that, although they are indeed capable of executing a further defined-length axial displacement, which is necessary for the following embossing operation, they are prevented from so doing by the embossing elements 5 , since the transporting rings 3 rest there. If the preforms do not have any transporting rings 3 , then the preform is preferably retained in this defined position by a movable, resiliently mounted base supports 11 . This defined residual axial displacement is executed for the embossing operation by the supporting pin 4 , the bell-shaped pressure-exerting member 7 , the preform 1 and the embossing elements 5 , counter to the restoring compression spring 6 .
  • the base support 11 is additionally moved counter to the compression spring 10 .
  • the embossing displacement is executed ideally when the heat balance is optimum for embossing as a result of the reheating at the embossing location 9 .
  • the embossing elements 5 can be formed, and positioned, in more or less any desired manner in the shaping region. It is possible for the embossing elements 5 to be all the same size or different sizes. The number of embossing elements can also be selected as desired on an individual basis. An ideal scenario is that where there are three to six equal-size embossing elements 5 , which can each leave behind axial ribs 14 at the location where the preform 2 is embossed. If these ribs 14 are distributed uniformly, which is achieved by equal-size embossing elements 5 , the subsequent blow-molding process is not disadvantaged.
  • the system can be relieved of loading, as a result of which the restoring compression spring moves the embossing elements 5 , and thus the preform 2 , the bell-shaped pressure-exerting member 7 and the supporting pin 4 , into the starting position again.
  • the restoring compression spring 6 it is, of course, possible for the restoring compression spring 6 to be replaced by a pneumatic function, in which case the preform 2 can be ejected at any desired later point in time via the embossing elements 5 .
  • This is critical, in particular, if the preform, for further post-cooling purposes, is to remain with contact cooling in the cooling sleeve 8 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US15/513,075 2014-09-22 2015-09-21 Method and device for the production of an optimized neck contour on preforms Abandoned US20170291334A1 (en)

Applications Claiming Priority (3)

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DE102014014144.6 2014-09-22
DE102014014144.6A DE102014014144A1 (de) 2014-09-22 2014-09-22 Verfahren und Vorrichtung zur Herstellung einer optimierten Halskontur an Preformen
PCT/DE2015/000472 WO2016045654A1 (de) 2014-09-22 2015-09-21 Verfahren und vorrichtung zur herstellung einer optimierten halskontur an preformen

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US16/448,369 Abandoned US20190308349A1 (en) 2014-09-22 2019-06-21 Method and apparatus for the production of an optimized neck contour on preforms
US16/903,043 Active 2036-04-14 US11325288B2 (en) 2014-09-22 2020-06-16 Method and device for the production of an optimized neck contour on preforms

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US (3) US20170291334A1 (de)
EP (1) EP3197655B1 (de)
JP (2) JP2017533132A (de)
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CN (1) CN107000262B (de)
BR (1) BR112017005298B1 (de)
CA (1) CA2961964C (de)
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US11135759B2 (en) 2017-09-08 2021-10-05 Nissei Asb Machine Co., Ltd. Blow molding apparatus and blow molding method
WO2023250040A1 (en) * 2022-06-21 2023-12-28 F&S Tool, Inc. Post-mold processing of preforms

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11135759B2 (en) 2017-09-08 2021-10-05 Nissei Asb Machine Co., Ltd. Blow molding apparatus and blow molding method
WO2023250040A1 (en) * 2022-06-21 2023-12-28 F&S Tool, Inc. Post-mold processing of preforms

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KR102394752B1 (ko) 2022-05-04
JP6975829B2 (ja) 2021-12-01
CN107000262A (zh) 2017-08-01
BR112017005298A2 (pt) 2017-12-12
ES2830389T3 (es) 2021-06-03
RU2017109523A3 (de) 2019-04-08
US11325288B2 (en) 2022-05-10
MX2017003715A (es) 2017-06-30
JP2017533132A (ja) 2017-11-09
CA2961964C (en) 2023-08-22
BR112017005298B1 (pt) 2022-03-22
EP3197655B1 (de) 2020-08-26
EP3197655A1 (de) 2017-08-02
DE112015004309A5 (de) 2017-10-19
WO2016045654A1 (de) 2016-03-31
CA2961964A1 (en) 2016-03-31
US20190308349A1 (en) 2019-10-10
KR20170077114A (ko) 2017-07-05
DE102014014144A1 (de) 2016-03-24
RU2017109523A (ru) 2018-10-24
JP2020179679A (ja) 2020-11-05
CN107000262B (zh) 2022-07-19
US20200307045A1 (en) 2020-10-01
RU2721113C2 (ru) 2020-05-15

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