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WO1991008099A1 - Recipients souffles - Google Patents

Recipients souffles Download PDF

Info

Publication number
WO1991008099A1
WO1991008099A1 PCT/GB1990/001812 GB9001812W WO9108099A1 WO 1991008099 A1 WO1991008099 A1 WO 1991008099A1 GB 9001812 W GB9001812 W GB 9001812W WO 9108099 A1 WO9108099 A1 WO 9108099A1
Authority
WO
WIPO (PCT)
Prior art keywords
preform
container
additional layer
separate pieces
parts
Prior art date
Application number
PCT/GB1990/001812
Other languages
English (en)
Inventor
James Butterworth
Original Assignee
Lin Pac Plastics International Limited
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
Priority claimed from GB898926490A external-priority patent/GB8926490D0/en
Priority claimed from GB909005879A external-priority patent/GB9005879D0/en
Application filed by Lin Pac Plastics International Limited filed Critical Lin Pac Plastics International Limited
Publication of WO1991008099A1 publication Critical patent/WO1991008099A1/fr

Links

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
    • 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
    • B29B11/08—Injection 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
    • B29C49/48—Moulds
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
    • 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
    • B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
    • 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
    • B29C2949/0761—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape
    • B29C2949/0762—Conical
    • 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
    • B29C2949/0761—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape
    • B29C2949/0767—Preforms or parisons characterised by their configuration characterised by the shape characterised by overall the shape the shape allowing stacking or nesting
    • 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
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    • 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
    • B29C2949/0771—Wide-mouth
    • 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
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    • 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
    • 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
    • B29C2949/079—Auxiliary parts or inserts
    • B29C2949/08—Preforms made of several individual parts, e.g. by welding or gluing parts together
    • 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0829—Height, 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
    • 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3008—Preforms or parisons made of several components at neck portion
    • B29C2949/3009—Preforms or parisons made of several components at neck portion partially
    • 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
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    • B29C2949/3012—Preforms or parisons made of several components 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3016—Preforms or parisons made of several components 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
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    • B29C2949/302—Preforms or parisons made of several components 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
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    • 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
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    • 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
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    • B29C2949/3026—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C2949/30—Preforms or parisons made of several components
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B29K2105/26—Scrap or recycled 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable

Definitions

  • Blow moulded bottles especially those made of clear plastics material which is bi-axially oriented during its blow moulding step are nowadays very popular. They are usually made entirely from or at least include PET (polyethylene terephthalate) . Such bottles are used to contain both carbonated and non-carbonated liquids. When they are used to contain carbonated liquids they often have domed ends to help resist the internal pressure. To enable such bottles to stand, the domed bottom end is fixed into a separate base cup and the resulting bottles are referred to as two-piece bottles. Blow moulded bottles are usually disposable and intended to be used once only. However since PET is expensive it is desirable, at least, to recycle the plastics material.
  • a preform or parison is made by injection moulding or by forming an extrusion which is subsequently placed in a mould.
  • the preform includes a moulded neck support ring, a sealing surface for the closure, and a closure attachment such as an external screw thread or an external ring around the neck of the bottle.
  • the preform is then preheated, or at least temperature conditioned if it has only just been formed, and is blown in a conventional blow moulding machine.
  • the blow moulding machine includes a stretch rod to extend the preform substantially to its
  • the plastics material in the side wall of the preform which will form the side wall of the bottle is bi-axially oriented which increases its strength and decreases its permeability to a great extent.
  • the material forming the neck portion of the bottle and that forming the middle of the base of the bottle are not stretched and accordingly the material in these portions remains as amorphous plastics material and is not bi-axially oriented to any great extent.
  • the neck portion of the bottle is of thick cross-section particularly because of the formation of the closure attachment and the neck support ring whilst the base of the bottle is somewhat thinner. Accordingly it is usually the base of such bottles which is their weakest point.
  • PET has a relatively low permeability which both prevents carbon dioxide escaping from carbonated beverages and prevents the ingress of oxygen into the bottles which can result in oxidation and spoilage of their contents.
  • barrier layer having a very low permeability. At present, this may be introduced when the preform is made by extrusion, by coextruding a barrier layer concentrically between inner and outer layers of PET. To ensure that no delamination takes place, adhesive is often extruded on both sides of the barrier layer. This technique is complicated and requires very expensive equipment. Furthermore, this technique does not result in a continuous barrier layer
  • barrier material When injection moulding a preform it is possible to co-inject barrier material with, for example, PET in much the same way as when co-extrusion techniques are used. In this way, as the plastics material is introduced into the injection mould a layer of barrier material is interposed between an inner and outer layer of PET.
  • barrier material To be able to co-injection mould or co-extrude a barrier material it is necessary to use a modified grade of the barrier material to ensure that it has similar viscosity and flow characteristics to that of PET and this somewhat degrades the performance of the barrier material.
  • barrier materials are very expensive and typically many times more expensive than PET.
  • the barrier material is located in a layer throughout the entire preform and is provided in, for example, the neck region as well as the side walls.
  • the expensive barrier material in this region is wasted which leads to the overall cost of the bottle being unnecessarily increased.
  • insert moulding techniques to produce multi-layer preforms and to mould reinforcing inserts into an injection moulded preform to, for example, reinforce and stabilise the neck portion of a bottle.
  • a preform for a blown container is injection moulded as two separate pieces which are subsequently fitted together before the preform is blown to form the container.
  • the two separate pieces of the preform which are fitted together before the bottle is blown comprise an inner part and an outer part with both the inner and the outer part extending over the whole of the
  • SUBSTITUTESHEET part of the preform which is used to form the body of the container.
  • a conventional preform has a wall thickness of typically 2 to 3mm.
  • the injection moulding machine typically has a cycle time of around 18 to 24 seconds.
  • increasing the wall thickness of the preform results in an exponential increase in the cycle time of the injection moulding machine.
  • the plastics material is injected into a preform mould of an injection moulding machine at high temperature in a molten state and must be cooled so that the preform is self supporting before it can be demoulded.
  • injection moulding tools are very expensive and as an example of this a forty eight cavity tool at present costs around £400,000. Small variations in weight of around 2 or 3 grams in a typical conventional preform of weight 48 grams can be achieved by exchanging the core pins of the injection moulding tool. The cost of replacement core pins is much less, typically £20,000 but can achieve only a small weight change.
  • the most expensive part of an injection mould tool is the part containing the lip cavities which form the thread and neck finish of the preforms. For plastics bottles to contain carbonated drinks these are usually of a standard configuration and a size of 28 mm or 38 mm diameter.
  • injection moulding tool costs can be considerably reduced.
  • the outer shell for the same length preform always has the same length and inner profile to match that of the inner shell.
  • Such outer shells can be made using a mould having a higher number of cavities and lower cost construction to manufacture a range of outer shells.
  • the weight and configuration of the outer shells can be changed by having the mould tool for the outer shell formed with replaceable inserts to define the outer wall of the mould but standard or common core pins.
  • preforms for bottles of capacity 1.5 litre and 3 litres can all be made from this single pair of injection mould tools having only a single set of lip cavities instead of, as at present, requiring the use of three completely separate injection mould tools each with their own lip cavities. This results in a considerable capital cost saving.
  • an additional layer is included between the inner and outer parts of the preform.
  • This additional layer may be provided by coating at least one of the adjacent surfaces of the inner and outer parts of the preform with an additional material or, by including a third injection moulded part so that the preform is made of three separate pieces which fit together with the piece to form the additional layer being sandwiched between the inner and outer parts of the preform.
  • the additional layer may be formed as a cap or sleeve which is placed around the outside of the inner part of the preform and which is sandwiched between the inner and outer parts of the preform.
  • the cap or sleeve may be provided from sheet material thermoformed to the appropriate shape or by merely wrapping a piece of flat sheet material which may or may not be fixed to itself around the outside of the inner part.
  • the additional layer may be formed by a tube and in this case preferably one end is sealed. In any event the material to form the additional layer is placed on the outside of the inner part of the preform and is sandwiched between the inner and outer parts of the preform.
  • the additional layer can be provided between the inner and outer parts of the preform.
  • the additional layer is by introducing the additional layer initially in the form of a liquid.
  • the liquid can be coated on the inside of the outer part or the outside of the inner part, preferably a metered quantity is introduced into the inside of the outer part and then the inner part is inserted into the outer part and, in so doing, forces the metered quantity of liquid to fill the entire space between the inner and outer parts and so removes any air from between them.
  • a liquid also acts as a lubricant when assembling the inner and outer parts.
  • the additional layer is provided as a liquid the liquid may be a monomer
  • SUBSTITUTE SHEET or co-monomer and subsequently be polymerised after the inner and outer parts have been fitted together.
  • the liquid material may be polymerised at normal room temperature or by the application of heat, for example by radiation, or by excitation by ultra sonic waves.
  • the inner shell maybe coated with a catalyst which activates a polymerising reaction on contact with the monomer or co-monomer in the outer part.
  • the heat used during the subsequent blow moulding process maybe used to complete the polymerisation.
  • the additional layer preferably has the form of a layer of relatively impermeable barrier material.
  • the barrier material is a plastics material such as nylon, EVOH (ethylene vinyl alcohol) or PVDC (polyvinylidene chloride) .
  • the barrier layer can be provided by, for example, a metal such as aluminium. This may be inserted as an aluminium foil or, alternatively aluminium can be evaporated onto the surface of one of the pieces of the preform.
  • the additional layer is also include an oxygen scavenging material. In this case the oxygen scavenging material chemically combines with oxygen molecules permeating through the side wall of the container to capture them and prevent them penetrating the side wall and reaching the contents inside the container.
  • the material to form the additional layer may be made from a stronger, and therefore usually more expensive, plastics material than the remainder of the preform.
  • plastics material such as nylon and polyarylate, but other materials such as ABS (acrylonitrile butadiene styrene) or SAN (styrene acrylonitrile) may be used.
  • the additional layer may be made from the same material as the inner and outer part of the
  • the additional layer may be made from a bi-axially oriented plastics material such as PET or polystyrene and because the plastics material is bi-axially oriented before the bottle is blown this provides additional reinforcement especially in areas of the preform such as those which provide the base of the bottle where the material from the inner and outer parts of the preform is not bi-axially oriented during blowing but, remains in its amorphous state.
  • the bi-axially oriented material used for such a reinforcing layer may be different from that used for the inner and outer parts of the preform.
  • the material to form the additional layer is located only in those regions of the preform in which it is required.
  • the material has the form of a barrier material it is preferably located only between those parts of the preform that, after blowing, form the body of the container.
  • the high quality and expensive barrier material is not present in the relatively thick neck region of the container and this leads to a considerable saving in the use of the barrier material.
  • the material to form the additional layer provides a physical reinforcement of the bottle this additional material may be provided only in the regions where it is needed.
  • the reinforcement has the form of a cap or thimble which is thermoformed from bi-axially oriented materials so that, after blowing, it is located only in the region of the base of the container. This ensures that the entire body region of the container then contains bi-axially oriented material and this prevents the conventional stress cracking which occurs in the base of the container and improves the impermeability of the base region of the container.
  • Such reinforcement enables the overall weight of the plastics material used for a
  • reinforcement can be provided in the form of a number of strips or hoops around the side wall of a cylindrical bottle by providing separate strips or bands of reinforcing material between the inner and outer parts of the preform.
  • the two or more separate pieces which fit together to make the preform preferably include attachment means which positively connect together the two or more separate pieces.
  • the attachment means may have the form of a mechanical lock which is provided by, for example, interengaging formations on the various separate pieces which, for example, snap together upon assembly of the preform.
  • the mechanical lock may be provided by a taper fit between the various pieces of the preform or be formed by welding together the various pieces of the preform. The welding may have the form of a small ultrasonic spot weld or heat fusion.
  • the attachment means may have the form of an adhesive which is provided on at least one of the adjacent faces of all of the separate pieces of the preform. This is especially preferred when the different parts of the preform are made from different materials to ensure that a good bond takes place between all parts of the preform on heating and before the subsequent blowing of the preform to form a container.
  • An adhesive ensures that the different layers in the finished container provided by the different pieces of the preform do no delaminate and this further increases the strength of the resulting container.
  • the adhesive When the adhesive has the form of a liquid it may be coated onto at least one of the adjacent faces of all of the separate pieces of the preform. Preferably, however a quantity of the liquid adhesive is metered into the inside of the outer, or each piece of the preform that has an inner part inserted into it.
  • the adhesive may have the form of a heat sensitive adhesive which cures upon the application of heat but preferably it is formed as a monomer of the same material as at least one of the parts
  • the two adjacent parts of the preform include spacing means extending into the space between the two adjacent parts of the preform.
  • the spacing means may take the form of longitudinally extending ribs or splines and preferably these are tapered in the radial direction. The spacing means ensures that the adjacent parts of the preform remain concentric and that the adhesive or additional layer has a uniform thickness in the circumferential direction around the preform.
  • the two or more separate pieces of the preform can be arranged positively not to adhere to one another even after they have been blown.
  • the adjacent surfaces of the parts of the preform may be coated with talc or be provided with an alternative non-stick coating such as PTFE (polytetrafluroethylene) or a mould release agent.
  • vents are provided between the two parts of the preform.
  • the container When the container is blown from such a preform provided it is inflated only by the introduction of gas into the inside of the inner part of the preform it forms a container in a conventional fashion.
  • the inner layer of the container since it is not bonded to the outer layer, can be removed by, for example, applying a vacuum to the inner part of the container and allowing air to flow through the vents into the interface between the two parts.
  • the material distribution between the outer part of th preform and inner part of the preform is arranged so that the majority of the material is contained in the outer part of the preform with only a very light weight and small amount such as 10% of plastics material is used in th inner part of the preform which acts as a lining.
  • Even th inner part of the container can be reused by recycling its material to produce new outer parts of preforms.
  • the container is 100 recyclable.
  • the present invention is particularly useful when th container is formed with a reduced diameter neck and thu has the form of a bottle.
  • the invention is als applicable to containers formed as tall or shallo wide-mouthed jars, for example.
  • the material used with the present inventio to form the inner and outer parts of the preform is th same and is usually PET.
  • One useful way of using th present invention is to make the inner part of the prefor from virgin plastics material and the outer part fro recycled plastics material. In this way, even if th recycled plastics material is contaminated in some wa since the inner part of the preform, which forms the par of the blown container which contacts the contents of th container, is made from virgin plastics material, th resulting container is still completely safe to use, eve for foodstuffs.
  • the present invention can also be used wit polystyrene and polypropylene.
  • PET has a glass transition temperature of around 70-75° centigrade in its amorphous state which increases to 160-180° centigrade when it is bi-axially oriented. Since it has such a low glass transition temperature the parts of the PET bottle which are still in their amorphous state soften and deform when such a bottle is filled by liquid which has just been flash pasteurised at 90C immediately before filling or, distort and deform if the bottle and its contents are subjected to a postfilling pasteurisation process.
  • Other materials, such as polypropylene and most of the engineering plastics referred to earlier are much more temperature stable.
  • the inner or outer part of the preform from a temperature stable plastics and the other from, for example, PET to provide a composite which has both a high degree of temperature stability and the good barrier properties such as resistance to permeability by water vapour that are required.
  • the two separate pieces of the preform which are fitted together before the bottle is blown do not comprise an inner and an outer part extending over the whole of the part of the preform which is used to form the body of the container they may, instead, comprise one part which forms a basic preform and parts of which are present in the wall of the entire container and a second part which is restricted to a particular localised extent in the complete container.
  • the second part may provide localised reinforcement by providing, for example, a ring of a dimensionally stable plastics material which is used to define the inside of the neck of a container with the remainder of the preform being formed of less stable material.
  • the inside of the neck of a preform which, in turn, provides the inside of the neck of the finished container and against which an internal
  • SUBSTITUTE SHEET plug on the closure forms a seal may be formed from a dimensionally and thermally stable plastics material such as polyarylate or an engineering plastic whilst the remainder of the preform is formed of, for example, PET.
  • PET dimensionally and thermally stable plastics material
  • Another way in which this aspect of the invention can be used takes account of the fact that PET itself is a reasonably expensive material and so provides a way of using a cheaper bulk material to provide the thicker regions of a bottle whilst allowing only PET to be used to provide the side wall of the body of the container.
  • the neck support ring and the closure attachment may be formed by a relatively cheap plastics material such as PVC whilst the entire inner surface of the neck region and the main body of the preform can be formed by a more expensive material such as PET.
  • Figure 7 is a cross-section through a mould for manufacturing the outer part of a preform
  • Figure 8 is a radial longitudinal section through the core pin of a modified form of mould
  • Figure 9 is a cross-section through another example of preform made using the mould shown in Figure 8.
  • Figure 10 is a scrap cross-section drawn to a very much larger scale of part of Figure 9.
  • a first example of preform in accordance with this invention which is shown in Figure 1 comprises an inner shell 1 including a closure retaining male screw thread 2
  • both shell 1 and shell 4 are made from PET.
  • a second example of preform shown in Figure 2 is generally similar to that shown in Figure 1 but in this example an additional layer 6 is sandwiched between the inner and outer shells 1 and 4.
  • the additional layer 6 consists of a laminate of heat sensitive adhesive, EVOH, and a heat sensitive adhesive.
  • the additional layer 6 is initially formed as a co-extruded tube which is cut to length and then one end closed before being pushed onto the outside of the inner shell 1.
  • both the inner and outer shells 1 and 4 are made of PET.
  • Figure 3 shows a third example which is generally similar to Figure 2 but is of larger diameter to provide a bottle of larger size.
  • Figure 4 shows a fourth example of preform in accordance with this invention for producing a bottle with a relatively thick outer wall and a separate internal liner.
  • the anti-pilfer ring support 3 is formed as part of the outer shell 4 instead as part of the inner shell 1. Again both the inner and outer shells 1 and
  • outer shell 4 are formed of PET but the outer shell 4 has a very much greater wall thickness than the inner shell 1. This results in the wall thickness of the finished bottle having a corresponding difference in thickness.
  • the outer shell 4 is formed of PET but the outer shell 4 has a very much greater wall thickness than the inner shell 1. This results in the wall thickness of the finished bottle having a corresponding difference in thickness.
  • both shells are formed of the same material it is convenient to form the outer shell 4 from recycled PET and the inner shell 1, which in use forms the entire contact surface with the contents to be packaged in the resulting bottle, from virgin plastics material to ensure that it is in no way contaminated.
  • a fifth example of preform in accordance with this invention is shown in Figure 5.
  • This fifth example is generally similar to the second and third except that the inner shell 1 is formed from polypropylene whilst the additional layer 6 and outer layer 4 are the same as the second and third examples.
  • the inner shell 1 which includes the neck region of the finished bottle, from polypropylene which has a good thermal stability a bottle is formed which can be hot filled with liquid, immediately after it has been flash-pasteurised without distortion of the bottle neck as would happen if the inner shell 1 was made of PET.
  • a sixth example of preform which is shown in Figure 6 whilst generally similar to all the others and made of the same material as the fifth example has a neck which is very much wider than its conical body.
  • the additional layer 6 is thermoformed into a conical shape before being sandwiched between the inner and outer shells 1 and 4.
  • This example of preform is intended to produce jars which can be hot filled with, for example, baby food or jam.
  • the shells 1 and 4 are made in a typical injection moulding machine using generally conventional moulds such as shown in Figure 7.
  • Figure 7 illustrates a mould for producing the outer shell 4 of a preform such as that shown in Figure 2.
  • the mould consists of a main female part 10
  • the core pin 12 includes a cooling fluid fountain tube 13 to direct cooling fluid towards the base of the hollow core pin 12 and an ejector plate 14 surrounding the outside of the top of the core pin 12.
  • a modification of the mould is used when it is required to provide the additional layer 6 between the inner shell 1 and outer shell 4 by using a material which is initially in the liquid state.
  • This additional layer may be used to form a high barrier layer or may be used as an adhesive to adhere the inner and outer shells 1 and 4 together.
  • a number of longitudinally extending grooves 16 triangular in section are cut into the outside of the core pin 12, as shown in Figure 8.

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

Abstract

Une préforme pour récipient soufflé est moulée par injection en deux parties distinctes (1, 4) qui sont ensuite assemblées avant que ladite préforme ne soit soufflée pour former un récipient. Ces deux parties (1, 4) se composeront de préférence d'une partie interne (1) et d'une partie externe (4), qui recouvriront toutes deux l'ensemble de la partie de la préforme utilisée pour constituer le corps du récipient. La fabrication de la préforme à partir de deux parties distinctes (1, 4) permet de gagner en solidité et en imperméabilité. Le récipient est aussi beaucoup plus pratique et beaucoup plus flexible lorsqu'on y inclut des couches supplémentaires (6, 18).
PCT/GB1990/001812 1989-11-23 1990-11-23 Recipients souffles WO1991008099A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB898926490A GB8926490D0 (en) 1989-11-23 1989-11-23 Blow moulded containers
GB8926490.7 1989-11-23
GB909005879A GB9005879D0 (en) 1990-03-15 1990-03-15 Blow moulded containers
GB9005879.9 1990-03-15

Publications (1)

Publication Number Publication Date
WO1991008099A1 true WO1991008099A1 (fr) 1991-06-13

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ID=26296240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/001812 WO1991008099A1 (fr) 1989-11-23 1990-11-23 Recipients souffles

Country Status (2)

Country Link
AU (1) AU6745390A (fr)
WO (1) WO1991008099A1 (fr)

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