WO2011010179A1 - Procédé et équipement de moulage de matière plastique par extrusion - Google Patents

Procédé et équipement de moulage de matière plastique par extrusion Download PDF

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Publication number
WO2011010179A1
WO2011010179A1 PCT/IB2009/006316 IB2009006316W WO2011010179A1 WO 2011010179 A1 WO2011010179 A1 WO 2011010179A1 IB 2009006316 W IB2009006316 W IB 2009006316W WO 2011010179 A1 WO2011010179 A1 WO 2011010179A1
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WO
WIPO (PCT)
Prior art keywords
mold
extruder
pet
previous
production
Prior art date
Application number
PCT/IB2009/006316
Other languages
English (en)
Inventor
Michael Nicholas Oldfeld Bartlett
Original Assignee
Momexx B.V.
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 Momexx B.V. filed Critical Momexx B.V.
Priority to PCT/IB2009/006316 priority Critical patent/WO2011010179A1/fr
Publication of WO2011010179A1 publication Critical patent/WO2011010179A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
    • 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
    • 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
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B29C2043/3433—Feeding the material to the mould or the compression means using dispensing heads, e.g. extruders, placed over or apart from the 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C2043/3665—Moulds for making articles of definite length, i.e. discrete articles cores or inserts, e.g. pins, mandrels, sliders
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • 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
    • B29C2949/076—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
    • B29C2949/0777—Tamper-evident band retaining ring
    • 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
    • B29C2949/0817—Wall thickness of the body
    • 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
    • B29C2949/0818—Wall thickness of the bottom
    • 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
    • B29C2949/082—Diameter
    • B29C2949/0822—Diameter of the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C2949/0829—Height, length
    • B29C2949/0831—Height, length of the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C2949/0829—Height, length
    • B29C2949/0835—Height, length of the body
    • 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
    • B29C2949/0861—Other specified values, e.g. values or ranges
    • B29C2949/0872—Weight
    • 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
    • B29C2949/3056—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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • 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
    • 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
    • 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
    • B29L2001/00—Articles provided with screw threads
    • 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

Definitions

  • the present invention relates to a method and equipment for molding plastics.
  • the invention relates to a method and equipment for producing plastic parts by extrusion molding, in particular thick wall, thin wall and very thin wall plastic parts.
  • the process relates to the production of parts with significant economic benefits as well as quality improvements, with a very wide design window.
  • Standard injection molding falls short in terms of product quality in areas where stress free parts, due to the high pressures involved, are required such as for optical lenses and optical disks where low birefringence and excellent optical properties are vital.
  • IMD In-mold-decoration, IMD, is also a process that benefits very highly from low pressure and low stress in the mold so that the decoration material is not subject to stress and possible movement during the process.
  • This process avoids the use of high injection pressures and imparted part stress by utilizing an expanded mold cavity for the injection phase, followed by a compression stroke that compresses the initially injected plaque form into the final part dimensions.
  • the standard process can be either sequential, where the compression phase follows the end of the injection phase, or simultaneous, where the compression phase starts already during the injection phase.
  • the movable mold half Prior to the start of the injection of the resin melt, the movable mold half is slightly withdrawn from the fixed mold half, by retraction of the movable machine platen, so that the cavity is still just closed whilst the mold halves are however maintained slightly apart from each other, with the distance between the molds equalling the compression stroke .
  • the mold halves are joined together as a result of the forward movement of the moveable machine platen and locked at full clamp force causing the immediate reduction of the cavity size and compression molding of the part.
  • EP 0.500.679 of Cincinatti Milacron Inc., US, "Mold clamping system” discloses an improved system for location of the mold using electric motors.
  • the concept is introduced of controlling the machine mold closing phase, which is the compression phase, using the cavity pressure as fixed reference to control the mold clamping and /or closing.
  • ICM selective injection compression molding
  • the mold cavity is closed in its standard finished part form.
  • the moveable piston or core mold part is mechanically retracted to expand the mold cavity, offsetting any pressure increase.
  • the piston is pushed back mechanically, under pressure of the hydraulic cylinder, into the mold reducing the cavity size and hence compressing the melt to form the final part.
  • This objective is met by using a method for molding molten plastic material into a finished part in a mold cavity, defined by a pair of cooperating relatively movable mold parts, at least one of them equipped with a moveable core, whereby an extruder is used to convey the molten material into the mold through a feed pipe and whereby, starting from a closed and fully clamped mold position and a cavity size in its standard finished part form, upon introduction of the molten material into the mold, the movement of the core, as well as the speed and timing of the extruder are controlled by the melt flow behavior of the molten material in the mold.
  • the invention involves indeed the incorporation of the mold based melt flow molding technology, FMT, into a melt process controlled extrusion molding system.
  • the low shear extruded resin enters a closed mold and, owing to its preferred flow in the machine direction, as opposed to the lateral direction that is forced upon it by the mold cavity geometry, the resin melt pressurizes the opposite mold half with the resultant effect of pushing opening and expanding the flexible mold cavity through a retraction of the movable core to allow the resin melt to continue to flow in the preferred direction, as well as being able to expand in the now widened lateral direction.
  • the pressure on the expanded cavity half drops sharply and the pre-pressurized part of the cavity half, i.e. the moveable core, naturally returns to its original position with the resultant compression of the melt.
  • An advantage is that it allows for the high output, low cost, multi-cavity production of both thick wall, thin wall and ultra thin wall parts using a low stress and low shear process .
  • Another major advantage is that the quality of the homogeneous resin melt that is produced by extrusion, as opposed to high pressure, high shear injection, has superior mechanical properties owing to the gentle low shear processing.
  • raw materials can be processed including high viscosity materials like polyethylene terephthalate, PET, and composite long fiber filled thermoplastic resins, LFT.
  • Another advantage of the process according to the invention is that it can be particularly well, though in no way exclusively, be applied in the high volume packaging market where the process can be effectively used to compete on quality and cost with extrusion thermoforming in the ultra thin wall container market, where other known processes like injection molding cannot compete.
  • the mold entry gates are also suitably large to cut down the shear stress as far as possible that is so extremely high at the very small diameter gates used in injection molding.
  • the resin is extruded into the mold via melt channels and runners that are appropriately designed in diameter to cut all shear stress to a minimum, as there is no back pressure requirement and resultant need for small channels that is integral in an injection molding process.
  • the process and materials, according to the invention are used for multicavity production of ultra thin wall polypropylene, PP, and polystyrene, PS, containers where the wall thickness can be as low as 150 microns.
  • the process and materials, according to the invention are used for multicavity production of ultra thin wall transparent polyethylene terephtalate, PET, containers where the wall thickness can be a low as 200 microns.
  • the process and materials, according to the invention are used for multicavity production of thin wall transparent and opaque PET containers for use for oven reheating of frozen or chilled ready meals.
  • process and materials, according to the invention are used for the multicavity production of thick wall PET preforms.
  • the process and materials, according to the invention are used for the multicavity production of transparent, high oxygen barrier, heat resistant, PET containers for use for processed foods that need to withstand the temperatures and pressures encountered in the pasteurisation ranging from 80 to 100 0 C and sterilisation at 121 0 C of shelf stable foods.
  • the process and materials, according to the invention are used for the multicavity production of transparent, high barrier, pressure resistant PET containers for the aerosol market.
  • the process and materials, according to the invention are used for the multicavity production of transparent and opaque PET squeezable tubes.
  • a magnetic field is applied by placement of a metal coil around the outside of the extruder, to effect a viscosity drop in the resin melt to improve the flow of the resin in the mold, without effecting the properties of the raw material.
  • Figure 1 is a cross section of the extruder barrel and screw and mold feed set up for producing parts having a wall thickness in excess of 0.5mm;
  • Figure 2 is a cross section of the mold showing the mechanical system that sustains the moveable mold part, particularly the moveable core, in the position in mold;
  • Figure 3 is a drawing of a polypropylene beaker, showing the beaker in perspective view, in lateral view and in cross section;
  • Figure 4 is a side view of the extruder, gear pump and mold for producing parts with a wall thickness of 250 to 500 microns;
  • Figure 5 is a cross sectional view of a 0,5 liter preform for carbonated beverages
  • Figure 6 is a drawing showing the dimensions of a shelf stable food container. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT.
  • Figure 1 shows the equipment of the type used in the invention, in particular it shows a cross section of the extruder barrel and screw, and mold feed set up for producing thick wall parts, being parts with a wall thickness of greater than 0.5 mm.
  • the plasticizing extruder 1 is composed of a hopper 2, a helical screw 3, an extruder barrel 4, heaters 5, a screen and breaker plate 6, a nozzle 7 and a shut off valve 8, and a feed pipe 12 connecting the extruder 1 to the fixed and hot mold half 13 and further to the mold cavity 14.
  • the helical screw 3 itself has a diameter 10 that is variable over its length 9 and is equipped with flights 11.
  • the plasticizing extruder 1 incorporates a helical screw 3 having a special length 9 to diameter 10 ratio of 24:1, with a 2:1 compression ratio, suitable for processing PET resin, as well as PS and PP, said screw having an enlarged melt volume capacity.
  • This melt volume capacity increase results from the fact that the screw diameter 10 is slightly reduced as compared with a standard screw, thereby making the screw flights 11 deeper than normal.
  • the screw 3 when rotating in the direction indicated by the arrow A, catches the material that is fed in the form of granules or pellets through the hopper 2, and melts and feeds it as flowable material, called the melt, in the conventional extrusion manner, into a nozzle 7, which, through a shut off valve 8 and a feed pipe 12 is connected to the fixed, hot, front mold half 13, and further to the mold cavity 14.
  • the nozzle 7 has a feed pipe 12 diameter of not less than 10 mm, preferably 12-15 mm to ensure both sufficient material dosing and to reduce any shear effects on the melt .
  • the feed pipe 12 is further equipped with a shut off valve 8 which can be closed to interrupt the flow from the extruder 1 to the fixed, hot, front mold half 13, and further into the mold cavity 14.
  • the operation is very simple and as follows.
  • the extruder 1 is directly connected to the fixed, hot, front mold half 13 and the mold cavity 14 with the shut off valve 8 in the open position, and the melt flows e.g. under an extrusion pressure of e.g.30 bar and at a rotational speed of 250 RPM via the nozzle 7 and the feed pipe 12 into the front mold half 13, and from there into the mold cavity 14.
  • the feed pipe 12 is closed, via the closure of the shut off valve 8, for the subsequent part of the product cycle namely during forming, cooling and dispensing of the finished part 15.
  • the extruder 1 continues to rotate but at a reduced speed of e.g. 30-50 RPM.
  • the low amount of melt that is generated at this part of the cycle, whilst the shut off valve 8 is in the off position, is capable of being contained in the extruder barrel 4 as the extruder melt capacity has been increased by increasing the distance between the flights 11 and the inner wall of the extruder barrel 4 as well as by increasing the individual flight depth, creating an extra 15% in melt volume that can be contained in the extruder 1.
  • the latter is sufficient to contain the additional melt that is produced during the time that the shut off valve 8 is in the closed position and hence the extruder 1 output must be contained within the barrel 4 to avoid having to shut the extruder off and on during the production cycle.
  • the delivery time for supply of the molten resin, a homopolymer with an melt flow index, MFI, of 10 gm/10 min, to the mold cavity 14 was 3 seconds, leaving the extruder 1 to run for a further 5 seconds with the shut off valve 8 in the closed position, cutting off any resin supply from the extruder 1 to the mold cavity 14.
  • the extruder 1 runs at just 5% of its normal output and produces just 5 gm of resin that is stored in the extra melt space in the extruder 1 provided by the larger flights 11 and the larger gap between the flights 11 and the barrel wall.
  • Figure 2 shows a cross section of the mold, consisting of a fixed, hot, front mold part 13, and a moveable back mold part 16, and the mechanical system 18 that sustains the moveable mold part 18, particularly the moveable core 17, in the position in mold.
  • the operating procedure during the molding and compression phase according to the invention is e.g. as follows.
  • the mold cavity 14 is enlarged by pressure of the resin onto a moveable mold part located in the mold, being the moveable core 17.
  • This moveable core 17 is displaced backwards by the resin, to temporarily enlarge the cavity 14 and thereby allow the resin to flow more easily in the mold cavity 14 during dosage of the resin into the mold.
  • the moveable core 17 is no longer under pressure and immediately contracts to close the cavity 14 back to its original size with the resultant compression of the preformed resin disk into the final finished part geometry.
  • Figure 2 also shows how the moveable core 17 is maintained in its fixed position in the mold by a positive pressure which comes from a vertical hydraulic cylinder 19 that is connected to the rear of the moveable mold part 16 by a mechanical slide link 20.
  • This mechanical slide link 20 acts as the connection between the moveable core 17 and the hydraulic cylinder 19.
  • melt pressure pushes back the moveable core 17 to expand the cavity 14 and in turn pushes back the hydraulic cylinder 19 via the mechanical slide link 20.
  • the resin melt pressure forces the moveable core 17 back in the direction of the arrow C in a time of 0.02 seconds to a distance of 3 mm, which is as far as necessary to reduce the pressure on the melt flow in the cavity 14.
  • the resin melt pressure in the forward machine direction, subsides with the corresponding direct release of pressure on the moveable core 17 which then retracts to close the mold cavity 14 with a compressive force on the resin melt.
  • This compressive force is approximately equal to the mold opening force and is sufficient to force the preformed resin in the mold cavity to flow into the remaining unfilled parts of the mold cavity 14 to produce the final full part geometry 15 (see figure 1).
  • the degree of resistance pressure on the moveable core 17 can be varied by varying the angle B of the mechanical slide link 20.
  • a smaller degree of the angle B clearly results in a greater force necessary on the core 17 to displace the hydraulic cylinder 19 as the cavity 14 is expanded in he direction indicated by the arrow C , with a correspondingly greater compressive force acting on the cavity 14 as it is closed.
  • Figure 3 shows a perspective view 23, a side view 22 and a cross section along the line DD' of view 22, of a typical thin wall polypropylene beaker, that is a beaker having a wall thickness of smaller than 250 micron, made following the method according to the invention, and at a part weight of 3.6 gm, with a production tolerance of +/-0.2 g.
  • the height 27 of the beaker is 80 mm, the outside diameter of the bottom 28 is 48.33 mm.
  • the wall thickness 30 is thereby 0,20 mm and the thickness of the bottom 29 is 0.35 mm.
  • Figure 4 is a side view of the extruder 1, gear pump 24 and fixed, hit, front mold part 13, used according to the invention for producing clear e.g. thin wall trays with a wall thickness of 250-500 micron.
  • such trays weighing 15 gm with a 300 micron wall are made in modified polyethylene terephthalate, PET, grade number 101AS, supplied by Pearl Engineering Polymers Limited.
  • This material has high viscosity, compared to PP, and also the part weight is in this case relatively high.
  • the extruder output is supplemented by a melt pump 24 placed after the extruder 1 as shown in the figure 4.
  • Such thin wall trays are ideal for use for modified atmosphere packaging, MAP, of chilled fresh foods such as meat, poultry, fish and pasta which are normally, according to the state of the art, packed in thermoformed PET/PE laminated or in coextruded trays.
  • extrusion compression molded PET trays according to the invention will have superior quality, particularly stiffness and clarity, as compared to the thermoformed tray as well as being fully recyclable as they are made from single material PET.
  • tubs, pots and special trays for frozen and chilled ovenable ready meals have been produced in addition to standard transparent trays.
  • thermoformed trays which are thermoformed trays made from a PET grade that can be readily crystallized during thermoforming in order to resist the high oven temperatures during meal reheating in microwave and conventional ovens, which standard clear APET (amorphous) trays cannot.
  • Both clear and opaque trays were produced in 20 gm with a wall thickness of 400 micron with a level of crystallinity of 25%.
  • Figure 5 shows a cross sectional view of a preferred embodiment of a 0,5 liter PET preform 25 for carbonated beverages, made following the method according to the invention, and produced in a single cavity tool at the ultra low weight of 15gms.
  • the inner diameter of the neck 31 was 21,74mm, the length of the neck 37 was 17.00 mm, and the length of the body 36 was 63.00 mm.
  • the mold part 13 (se figures 1 and 2) has been modified to give a better performance in terms of crystallinity level and material stretchability.
  • the gate 29 is wider than normal but the design is such that the wall thickness is lower with resultant reduced crystallization at the gate.
  • Figure 6 shows a shelf stable food can represented in cross section 27 and in perspective view 28.
  • the outside diameter 38 was 110 mm
  • the inside diameter 39 was 100 mm
  • the height 40 was 80 mm
  • the outside diameter of the bottom 41 was 50 mm
  • the radius 42 was 159.
  • the thickness of the rim 43 in this example was 0,40 mm.
  • the PET containers in this embodiment were made of a modified PET that has increased thermal stability as a result of a greater level of crystallinity.
  • the level of crystallinity in these containers was above 35% in order to achieve improved mechanical properties as well as increased thermal resistance for hot fill at 85-90 0 C and pasteurization at 85-90 0 C of high acid foodstuffs (shelf stable fruits, pickled vegetables, jams and marmalades) whilst retaining transparency, by keeping the size of the crystal spherulites as low as possible.
  • the containers were produced with modified PET, Pearl Engineering Polymers grade 105CHH, using extrusion flow molding conditions according to the invention, as described above for the PET trays.
  • transparent thermal resistant PET containers that could withstand heat sterilization at 121°C were produced following the method of the invention.
  • the containers were warm filled at 65 0 C and sealed before being fed to a batch counter pressure autoclave for processing at 121°C for a 1 hour cycle.
  • transparent modified PET cans were made for carbonated soft drinks and beer.
  • the cans were roll seam closed with standard metal ends.
  • transparent modified PET aerosol containers were extrusion molded according to the invention.
  • PE tubes were extrusion compression molded.
  • the neck thread was separately formed by reheating the neck in a thread mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de moulage de matière plastique fondue en une pièce finie (15) dans la cavité (14) d'un moule, défini par deux moitiés de moule (13, 16) qui peuvent se déplacer l'une par rapport à l'autre en coopération et dont au moins l'une (16) est dotée d'une âme mobile (17), le procédé étant caractérisé en ce qu'il utilise une extrudeuse (1) pour transporter le matériau fondu dans la cavité (14) du moule par un conduit d'alimentation (12) et en ce que, partant d'une position fermée et complètement pincée du moule et d'une cavité (14) d'une taille de la forme (15) de la pièce finie standard, lors de l'introduction du matériau fondu dans le moule, le déplacement de l'âme (17) ainsi que la vitesse et la cadence de l'extrudeuse (1) sont contrôlés par le comportement d'écoulement du matériau fondu dans le moule.
PCT/IB2009/006316 2009-07-22 2009-07-22 Procédé et équipement de moulage de matière plastique par extrusion WO2011010179A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013121397A2 (fr) * 2012-02-17 2013-08-22 Smartflow Innovative Plastics Containers B.V. Résine polyester moulable par injection et par intrusion, son procédé de fabrication et article moulé par injection et par intrusion
CN115157518A (zh) * 2022-06-30 2022-10-11 蜂巢能源科技股份有限公司 一种电解质膜的制备系统和硫化物电解液膜的制备方法及其应用

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US2781547A (en) * 1951-12-26 1957-02-19 Honeywell Regulator Co Molding procedure and apparatus
US4592711A (en) * 1983-03-10 1986-06-03 Gilbert Capy Apparatus for fabricating plastic parts
US5082604A (en) * 1990-11-19 1992-01-21 Valyi Emery I Extrusion of plastics
EP0585850A1 (fr) * 1992-09-03 1994-03-09 ABBPATENT GmbH Moule pour la réalisation d'objets moulés
US5310330A (en) * 1991-04-23 1994-05-10 Krauss-Maffei Aktiengesellschaft System for molding laminated articles of a thermoplastic resin
DE10214008A1 (de) * 2002-03-29 2003-10-16 Battenfeld Gmbh Verfahren und Vorrichtung zum Hinterspritzen
US6699422B1 (en) * 1998-10-28 2004-03-02 Lothar Stemke Shaping method for producing plastic parts and device for carrying out said method
WO2007068995A1 (fr) * 2005-12-16 2007-06-21 Founders Company Limited Procede et appareil de fabrication de produits plastiques

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Publication number Priority date Publication date Assignee Title
US2781547A (en) * 1951-12-26 1957-02-19 Honeywell Regulator Co Molding procedure and apparatus
US4592711A (en) * 1983-03-10 1986-06-03 Gilbert Capy Apparatus for fabricating plastic parts
US5082604A (en) * 1990-11-19 1992-01-21 Valyi Emery I Extrusion of plastics
US5310330A (en) * 1991-04-23 1994-05-10 Krauss-Maffei Aktiengesellschaft System for molding laminated articles of a thermoplastic resin
EP0585850A1 (fr) * 1992-09-03 1994-03-09 ABBPATENT GmbH Moule pour la réalisation d'objets moulés
US6699422B1 (en) * 1998-10-28 2004-03-02 Lothar Stemke Shaping method for producing plastic parts and device for carrying out said method
DE10214008A1 (de) * 2002-03-29 2003-10-16 Battenfeld Gmbh Verfahren und Vorrichtung zum Hinterspritzen
WO2007068995A1 (fr) * 2005-12-16 2007-06-21 Founders Company Limited Procede et appareil de fabrication de produits plastiques

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013121397A2 (fr) * 2012-02-17 2013-08-22 Smartflow Innovative Plastics Containers B.V. Résine polyester moulable par injection et par intrusion, son procédé de fabrication et article moulé par injection et par intrusion
WO2013121397A3 (fr) * 2012-02-17 2013-11-21 Smartflow Innovative Plastics Containers B.V. Résine polyester moulable par injection et par intrusion, son procédé de fabrication et article moulé par injection et par intrusion
CN115157518A (zh) * 2022-06-30 2022-10-11 蜂巢能源科技股份有限公司 一种电解质膜的制备系统和硫化物电解液膜的制备方法及其应用
CN115157518B (zh) * 2022-06-30 2023-12-01 蜂巢能源科技股份有限公司 一种电解质膜的制备系统和硫化物电解液膜的制备方法及其应用

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