EP2303962A2 - Formulation de matière plastique et procédé pour fabriquer des bouteilles en matière plastique selon un processus de soufflage par bi-orientation en deux étapes - Google Patents

Formulation de matière plastique et procédé pour fabriquer des bouteilles en matière plastique selon un processus de soufflage par bi-orientation en deux étapes

Info

Publication number
EP2303962A2
EP2303962A2 EP09777195A EP09777195A EP2303962A2 EP 2303962 A2 EP2303962 A2 EP 2303962A2 EP 09777195 A EP09777195 A EP 09777195A EP 09777195 A EP09777195 A EP 09777195A EP 2303962 A2 EP2303962 A2 EP 2303962A2
Authority
EP
European Patent Office
Prior art keywords
plastic
molding process
preform
stretch blow
blow molding
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Withdrawn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
EP09777195A
Other languages
German (de)
English (en)
Inventor
Robert Siegl
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.)
Alpla Werke Alwin Lehner GmbH and Co KG
Original Assignee
Alpla Werke Alwin Lehner GmbH and Co KG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40092020&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2303962(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Alpla Werke Alwin Lehner GmbH and Co KG filed Critical Alpla Werke Alwin Lehner GmbH and Co KG
Priority to EP11000973A priority Critical patent/EP2319883A1/fr
Publication of EP2303962A2 publication Critical patent/EP2303962A2/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Withdrawn legal-status Critical Current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
    • B29C49/08—Biaxial stretching during 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
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • B29B11/06—Making preforms by moulding the material
    • B29B11/12—Compression 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
    • 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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/786—Temperature
    • B29C2049/7861—Temperature of the preform
    • B29C2049/7862—Temperature of the preform characterised by temperature values or ranges
    • 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
    • B29C2049/7879—Stretching, e.g. stretch rod
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall 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
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3056—Preforms or parisons made of several components having components being compression moulded
    • 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
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • 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
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
    • 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
    • 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
    • B29C49/087—Means for providing controlled or limited stretch ratio
    • 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
    • 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
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Definitions

  • the invention relates to a plastic formulation for the production of plastic bottles in a two-stage stretch blow molding process according to the preamble of claim 1. Furthermore, the invention also relates to a method for producing plastic bottles in a two-stage stretch blow molding process.
  • a so-called preform which usually has an elongated tube-like shape, at its one longitudinal end a bottom and at the other longitudinal end a neck portion with molded threaded portions or the like, inserted into a mold cavity of a blow mold and inflated by a medium blown with overpressure.
  • the preform is additionally stretched in the axial direction with a retracting mandrel inserted through the neck opening. After the stretching / blowing process, the finished plastic bottle is removed from the blow mold.
  • the single-layer or multi-layer preform is produced before the stretch blow molding process in a separate injection molding or in a plastic fleece extrusion process.
  • the preform is inflated and stretched to a plastic container immediately after its production.
  • the plastic containers are produced in a two-stage process, spatially and temporally separated from the stretch blow molding process, and temporarily stored for later use.
  • the preforms are reheated to produce plastic bottles. In this way, both processes, injection molding and stretch blow molding, can be operated separately and optimally.
  • the preform is brought to the required temperature by infrared radiation, for example, and stretched in the axial direction with a stretching rod during the forming process and formed radially in the mold by means of overpressure.
  • Polypropylene or PET is mainly used as raw material for the production of plastic bottles in the stretch blow molding process.
  • Polypropylene and PET have been tried and tested and their properties are well known.
  • polypropylene has relatively poor top load characteristics due to its low stiffness.
  • the creep properties of oriented polypropylene are poor.
  • Plastic bottles, which are produced in a two-stage process generate great difficulties in recycling electricity because of the commonly used PET and because of their wide range of use.
  • plastic containers, which are used for example as milk bottles, for the provision of cosmetics or for the storage of cleaning agents should be eliminated in recycling, since they are undesirable for direct food contact. Because of the density of PET, these bottles are not excreted in a sink-float process.
  • HDPE High Density Polyethylene
  • the preforms used in injection blow molding and in the single-stage stretch blow molding process therefore already have a length which differs only slightly from the length of the bottles produced. Accordingly, the longitudinal stretching ratio is only 1 to 1.8.
  • the diameter stretching ratio is between 1 and at most 2.2.
  • the material distribution during stretch blow molding can be influenced by the viscosity of the raw material used. But those viscous raw materials, which can be easily processed in the stretch blow molding process, often have too high a viscosity for the injection molding process.
  • raw materials which are to be suitable for the two-stage stretch blow molding process must meet the requirements of the injection molding process for producing the preforms and those of the stretch blow molding process in which plastic bottles are produced from the preforms. It is therefore an object of the present invention to provide a plastic formulation based on HDPE, which is suitable for the two-stage stretch blow molding process.
  • the HDPE formulation should allow a smooth injection molding process without melt fracture and on the other hand allow sufficient stretch hardening in the stretch blow molding process.
  • a two-stage stretch blow molding process for processing the plastic formulation according to the invention is to be created.
  • the plastic formulation according to the invention for the production of plastic bottles in a two-stage stretch blow molding process is based at least 60% on HDPE (High Density Polyethylene), which has a density of 0.941 g / cm 3 to 0.965 g / cm 3 and a first index of 190 ° C. 2.16 kg from 0.1 to 0.9 g / 10 min according to ISO 1133, wherein the HDPE comprises a monomodal or multimodal HDPE with a second melt index 190 ° C / 21.6 kg from 5 g / 10 min to 50 g / 10 min, also measured by ISO 1133.
  • HDPE High Density Polyethylene
  • the plastic formulation has a first melt index 190 ° C / 2.16 kg of about 0.3 g / 10 min and a second melt index 190 ° C / 21.6 kg of 30 g / 10 min and a bimodal distribution.
  • the plastic matrix based on bimodal or multimodal HDPE is optimized on the one hand for the injection molding process (or for a flow molding process) and on the other hand also very well suited for the stretch blow molding process.
  • the HDPE of the selected density can be processed largely without difficulty in the injection molding process.
  • the viscosity of the low molecular weight HDPE in the injection molding process ensures that
  • the HDPE formulation according to the invention also makes it possible to produce plastic bottles in the two-stage stretch blow molding process and thereby exploit the advantages of the HDPE, for example its high water vapor barrier over the PET of the plastic bottles produced therefrom.
  • Plastic bottles made of the HDPE formulation according to the invention have comparable strength values to PET bottles with a lower bottle weight. Lower weight means lower raw material input and thus lower oil consumption and conservation of resources as well as a reduction of CO 2 emissions.
  • the plastic formulation produced essentially on the basis of bimodal or multimodal HDPE has a density of 0.941 g / cm 3 to 0.965 g / cm 3 . As a result, the plastic bottles produced from the plastic formulation can be very easily sorted out, for example in a floating-sink process, by their density from the PET stream.
  • the plastic formulation may also be mixed with up to 40% calcium carbonate in order to reduce the required amount of plastic.
  • An embodiment of the invention has at least 90% HDPE.
  • this embodiment of the plastic formulation may also contain up to 10% calcium carbonate and / or talcum and / or a blend of polymers suitable for the blowing process as a filler.
  • the addition of this type of filler changes the density and the rheological properties only to a very limited extent, so that the processing parameters do not have to be adjusted at all or only insignificantly.
  • the achievable strength values of the plastic bottles produced in the two-stage stretch blow molding method are only insignificantly influenced by the addition of the fillers in the stated amounts.
  • plastic formulation 0.1% to 4% of a dye based on titanium oxide and / or zinc sulfide.
  • the HDPE used in the plastic formulation according to the invention comprises a bimodal or multimodal HDPE having a first melt index of 190 ° C./2.16 kg of 0.1 g / 10 min 0.9 g / 10 min. Furthermore, a second melt index is characterized as characterizing 190 ° C / 21.6 kg of 5 g / 10 min to 50 g / 10 min, measured according to ISO 1133.
  • the plastic formulation has a first melt index 190 ° C / 2.16 kg of about 0.3 g / 10 min and a second melt index 190 ° C / 21.6 kg of 30 g / 10 min and a bimodal distribution.
  • the plastic matrix based on HDPE is optimized for the injection molding process (or for a flow molding process) and on the other hand it is also very well suited for the stretch blow molding process.
  • the viscosity of the low molecular weight HDPE in the injection molding process ensures that melt fractures are prevented.
  • the higher molecular weight HDPE is essentially responsible for achieving sufficient strain hardening of the plastic in the stretch blow molding process.
  • the shrinkage values which can be achieved with the plastic formulation based on multimodal HDPE largely correspond to those of PET shortly after injection molding. This makes it possible to use injection molds from PET processing in the injection molding process. The same applies to the stretch blow molding process, where the existing blow molds for PET processing can also be used.
  • the conversion of the raw material from PET to a plastic formulation based on HDPE does not necessarily result in tool investment.
  • a preform is first produced from a plastic formulation in an injection molding process or in a flow molding process, from which a plastic bottle is produced in a second, temporally and / or spatially separate process step in a stretch blow molding process.
  • the preform is axially and radially stretched or stretched.
  • a plastic formulation based on HDPE having a density of from 0.941 g / cm 3 to 0.965 g / cm 3 or a melt index 190 ° C./2.16 kg of 0.1 to 0.9 g / 10 min is processed to ISO 1133 ,
  • HDPE plastic formulations according to the invention makes it possible to carry out a "normal" two-stage stretch blow molding process in which the preform made from the raw material is axially stretched to a sufficient extent and radially stretched to impart the required strength values to the plastic bottle produced.
  • the preform is produced with an injection point having a diameter of 2 mm to 5 mm.
  • the injection pressures in the hot runner are between 200 bar and 2000 bar.
  • the preform is produced with an average wall thickness of 2.1 mm to 2.9 mm. With these wall thicknesses, the preform in the stretch blow molding process can be brought to the required processing temperature sufficiently quickly and uniformly, and the desired high processing speeds can be achieved without sacrificing quality or strength.
  • a variant of the invention provides that the preform for processing in the stretch blow molding process to a temperature of 115 ° C to 135 C C is heated.
  • the low temperatures are not typical for HDPE.
  • the special HDPE plastic formulation allows these temperature ranges, in which the flow behavior of the HDPE is particularly regular, and therefore can also be inflated complex molded plastic containers in the required quality. It proves to be expedient if the preform for further processing in the blow mold is heated to a processing temperature of about 125.degree. This is done for example by infrared radiation.
  • a variant of the method provides that the preform is stretched axially during the stretch blow molding process in a longitudinal stretch ratio of 1.8 to 3.2, thus achieving a higher strength.
  • the axial stretching speed is chosen to be 0.8 m / s to 2 m / s in order to achieve the shortest possible cycle times for the production process and, on the other hand, to achieve Ensure that the stretching rod does not penetrate axially the preform heated to the processing temperature.
  • the preform is inflated and stretched axially in the stretch blow-molding process such that an inflated round bottle has a wall thickness variation that is less than + 0.5 mm.
  • the wall thickness of the plastic bottles can be further optimized without falling below the minimum permissible wall thicknesses required for the required axial and radial strengths of the HDPE bottles. This can save raw material.
  • a reduced use of raw materials means lower oil consumption and conservation of resources as well as a reduction in CO 2 emissions. All this makes the use of the HDPE plastic formulation according to the invention and of the optimized two-stage stretch blow molding process desirable from an economic as well as an ecological point of view.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

L'invention concerne une formulation de matière plastique pour fabriquer des bouteilles en matière plastique selon un processus de soufflage par bi-orientation en deux étapes. Cette formulation comprend au moins 60 % de PEHD (polyéthylène à haute densité) présentant une densité comprise entre 0,941 g/cm3 et 0,965 g/cm3 et possédant un indice de fluidité à 190 °C sous une charge de 2,16 kg compris entre 0,1 et 0,9 g/10 min selon la norme ISO 1133, ce PEHD comprenant un PEHD monomodal ou multimodal possédant un second indice de fluidité à 190 °C sous une charge de 21,6 kg compris entre 5 et 50 g/10 min selon la norme ISO 1133. L'invention concerne en outre un procédé de fabrication d'une bouteille en matière plastique selon un processus de soufflage par bi-orientation en deux étapes, ce procédé consistant à transformer une formulation de matière plastique selon l'invention.
EP09777195A 2008-07-24 2009-07-15 Formulation de matière plastique et procédé pour fabriquer des bouteilles en matière plastique selon un processus de soufflage par bi-orientation en deux étapes Withdrawn EP2303962A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11000973A EP2319883A1 (fr) 2008-07-24 2009-07-15 Composition de matière synthétique et procédé de fabrication de bouteilles en plastique dans un processus de soufflage enfichable à deux étapes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01161/08A CH699237B1 (de) 2008-07-24 2008-07-24 Kunststoffformulierung und Verfahren zur Herstellung von Kunststoffflaschen in einem Zweistufen-Streckblasprozess.
PCT/EP2009/005126 WO2010009832A2 (fr) 2008-07-24 2009-07-15 Formulation de matière plastique et procédé pour fabriquer des bouteilles en matière plastique selon un processus de soufflage par bi-orientation en deux étapes

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP11000973.5 Division-Into 2011-02-08

Publications (1)

Publication Number Publication Date
EP2303962A2 true EP2303962A2 (fr) 2011-04-06

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EP09777195A Withdrawn EP2303962A2 (fr) 2008-07-24 2009-07-15 Formulation de matière plastique et procédé pour fabriquer des bouteilles en matière plastique selon un processus de soufflage par bi-orientation en deux étapes
EP11000973A Withdrawn EP2319883A1 (fr) 2008-07-24 2009-07-15 Composition de matière synthétique et procédé de fabrication de bouteilles en plastique dans un processus de soufflage enfichable à deux étapes

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EP11000973A Withdrawn EP2319883A1 (fr) 2008-07-24 2009-07-15 Composition de matière synthétique et procédé de fabrication de bouteilles en plastique dans un processus de soufflage enfichable à deux étapes

Country Status (8)

Country Link
US (2) US8604116B2 (fr)
EP (2) EP2303962A2 (fr)
CN (1) CN102105526A (fr)
BR (1) BRPI0916357A2 (fr)
CH (1) CH699237B1 (fr)
MX (1) MX336486B (fr)
RU (1) RU2520564C2 (fr)
WO (1) WO2010009832A2 (fr)

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US10239267B2 (en) † 2010-10-26 2019-03-26 Basell Poliolefine Italia S.R.L. Process for producing injection stretch blow molded polyolefin containers
US10118724B2 (en) 2010-11-12 2018-11-06 Niagara Bottling, Llc Preform extended finish for processing light weight ecologically beneficial bottles
US10829260B2 (en) 2010-11-12 2020-11-10 Niagara Bottling, Llc Preform extended finish for processing light weight ecologically beneficial bottles
RU2013123905A (ru) 2010-11-12 2014-12-20 Ниагара Боттлинг, Ллс. Удлиненная концевая часть преформы для производства бутылок малого веса
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Also Published As

Publication number Publication date
CN102105526A (zh) 2011-06-22
US20140077424A1 (en) 2014-03-20
US8604116B2 (en) 2013-12-10
CH699237A1 (de) 2010-01-29
MX2011000497A (es) 2011-02-23
EP2319883A1 (fr) 2011-05-11
US20110115135A1 (en) 2011-05-19
MX336486B (es) 2016-01-21
BRPI0916357A2 (pt) 2018-06-12
CH699237B1 (de) 2011-07-15
WO2010009832A3 (fr) 2010-07-15
US8772393B2 (en) 2014-07-08
RU2520564C2 (ru) 2014-06-27
RU2011106751A (ru) 2012-08-27
WO2010009832A2 (fr) 2010-01-28

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