Integral Two Layer Preform, Process and Apparatus for the Production Thereof, Process for Producing a Blow-Moulded Bag-in-Container, and Bag-in-Container Thus Produced
OwnerSarah Van Hoveinventor
Life of this patent
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Abstract
The invention is an integral two-layer preform (1) for the production of integrally blow-moulded bag-in-containers (2). The preform has an inner layer (11) and an outer layer (12), wherein the preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of the container releases from the thus obtained outer layer upon introduction of a gas at a point of interface of the two layers. The melting temperature of the inner layer is greater than or equal to the melting temperature of the outer layer.
Claims18
An integral two-layer preform for the production of integrally blow-moulded bag-in-containers, said preform comprising:
- an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of said container releases from the thus obtained outer layer upon introduction of a gas at a point of interface of said two layers;
- and
- the melting temperature of the inner layer is greater or equal to the melting temperature of the outer layer.
A process for the production of a preform having
- an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of said container releases from the thus obtained outer layer upon introduction of a gas at a point of interface of said two layers;
- and
- the melting temperature of the inner layer is greater or equal to the melting temperature of the outer layer,
- comprising the following sequential steps:
- injection moulding the inner layer onto a core;
- injection moulding the outer layer onto the inner layer, and
- extracting the thus formed preform from the core.
A tool of the core shell type suitable for the production of a preform having
- an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of said container releases from the thus obtained outer layer upon introduction of a gas at a point of interface of said two layers, and
- the melting temperature of the inner layer is greater or equal to the melting temperature of the outer layer,
- comprising a core mould provided at the base thereof with at least one pin suitable for forming a vent at the interface between the first and second layers of said preform.
An apparatus for producing a preform having
- an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of said container releases from the thus obtained outer layer upon introduction of a gas at a point of interface of said two layers, and
- the melting temperature of the inner layer is greater or equal to the melting temperature of the outer layer,
- comprising:
- support means provided with at least two similar male cores;
- at least first and second shell female moulds each connected to an extruder, such that the first shell mould is dimensioned for producing the inner layer and the second shell mould for producing the outer layer on top of the inner one;
- at least one optional extraction station, and
- means for moving the support means so that each core can be positioned sequentially opposite the first shell mould, the second shell mould and, optionally, the extraction station.
Integrally blow-moulded bag-in-container produced by blow-moulding a preform comprising:
- an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the thus obtained inner layer of said container releases from the thus obtained outer layer upon introduction of a gas at a point of interface of said two layers, and
- the melting temperature of the inner layer is greater or equal to the melting temperature of the outer layer.
Dependencies are inferred from the claim text.