EP0182094B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for making a container with a sealable opening, and container obtained thereby
Assignee: Kautex-Werke Reinold Hagen AG
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Filing: 1985-10-15
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Granted: 1990-08-22
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Expires: 2005-10-15
Abstract
Abstract 1. A process for the production of a packaging (38) which is provided with a closable opening and which is provided with an outer container (40) which is substantially stiff in respect of shape and within which is disposed a container (42) of flexible material for accommodating the filling material, wherein a preform (16) comprising two substantially coaxial tubular portions (18, 20) is firstly extruded in a co-extrusion process and the simultaneously extruded portions (18, 20) comprise different thermoplastic materials which do not become joined together and after reaching the required length in a blowing mould (12), are expanded by the application of an internal increased pressure until the outer portion (18) bears against the wall of the blowing mould (12) and the bottom (52) of the packaging (38) is formed with excess material (24) being squeezed off with the simultaneous formation of a welded seam (51) on the inner container (42), characterised in that the operation of squeezing off excess material (24) is effected without the simultaneous formation on the outer container (40) of a welded seam which would close off the outer container (40) so that there is a sufficiently large opening (57) in the outer container (40) through which the region between the outer container (40) and the easily deformable, bag-like inner container (42) is communicated with the ambient atmosphere in order for the pressure of the ambient atmosphere to act permanently on the inner container (42).
Inventors
- 👤 Alfred Thomas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 05:00
CPC Classifications
B; B65; B65D; B65D83/00; B65D83/771; B05; B05B; B05B11/00; B05B11/01; B05B11/02; B05B11/026; B29; B29C; B29C49/00; B29C49/02; B29C49/04; B29C49/22; B29C2793/00; B29C2793/0054; B29C2949/00; B29C2949/30; B29C2949/3086; B29C2949/3094; B29K; B29K2995/00; B29K2995/0037; B29K2995/0046; B29L; B29L2009/00; B29L2009/001; B29L2031/00; B29L2031/712; B29L2031/7158; B65D2231/00; B65D2231/001; B65D2231/004
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
239 words
A process for the production of a packaging (38) which is provided with a closable opening and which is provided with an outer container (40) which is substantially stiff in respect of shape and within which is disposed a container (42) of flexible material for accommodating the filling material, wherein a preform (16) comprising two substantially coaxial tubular portions (18, 20) is firstly extruded in a co-extrusion process and the simultaneously extruded portions (18, 20) comprise different thermoplastic materials which do not become joined together and after reaching the required length in a blowing mould (12), are expanded by the application of an internal increased pressure until the outer portion (18) bears against the wall of the blowing mould (12) and the bottom (52) of the packaging (38) is formed with excess material (24) being squeezed off with the simultaneous formation of a welded seam (51) on the inner container (42), characterised in that the operation of squeezing off excess material (24) is effected without the simultaneous formation on the outer container (40) of a welded seam which would close off the outer container (40) so that there is a sufficiently large opening (57) in the outer container (40) through which the region between the outer container (40) and the easily deformable, bag-like inner container (42) is communicated with the ambient atmosphere in order for the pressure of the ambient atmosphere to act permanently on the inner container (42).
Claim 2
Dependent Claim
239 words
A process for the production of a packaging (38) which is provided with a closable opening and which is provided with an outer container (40) which is substantially stiff in respect of shape and within which is disposed a container (42) of flexible material for accommodating the filling material, wherein a preform (16) comprising two substantially coaxial tubular portions (18, 20) is firstly extruded in a co-extrusion process and the simultaneously extruded portions (18, 20) comprise different thermoplastic materials which do not become joined together and after reaching the required length in a blowing mould (12), are expanded by the application of an internal increased pressure until the outer portion (18) bears against the wall of the blowing mould (12) and the bottom (52) of the packaging (38) is formed with excess material (24) being squeezed off with the simultaneous formation of a welded seam (51) on the inner container (42), characterised in that the operation of squeezing off excess material (24) is effected without the simultaneous formation on the outer container (40) of a welded seam which would close off the outer container (40) so that there is a sufficiently large opening (57) in the outer container (40) through which the region between the outer container (40) and the easily deformable, bag-like inner container (42) is communicated with the ambient atmosphere in order for the pressure of the ambient atmosphere to act permanently on the inner container (42).
Claim 3
Dependent Claim
66 words
A process according to claim 1 characterised in that, after the termination of the shaping operation and after the material forming the outer container (40) has sufficiently set, a force is caused to act on the bottom (52) thereof, which produces a spacing between the wall portions (44, 46) of the bottom of the outer container (40), which are in opposite relationship in the squeezing-off region.
Claim 4
Dependent Claim
33 words
A process according to claim 2 characterised in that the force is applied to the bottom (52) of the outer container (40) when the packaging (38) is still within the blowing mould (12).
Claim 5
Dependent Claim
34 words
A process according to claim 2 characterised in that the force is caused to act on the bottom (52) of the outer container (40) by an increased pressure taking effect within the packaging (38).
Claim 6
Dependent Claim
40 words
A process according to claim 2 characterised in that the force is caused to act on the bottom (52) of the outer container (40) at a time at which the outer container is still plastically deformable to a certain extent.
Claim 7
Dependent Claim
43 words
A process according to claim 1 characterised in that the inner portion (20) of the preform (16) for producing the inner container (42) is produced by the co-extrusion of a plurality of layers of different materials, which are welded to form a unit.
Claim 8
Dependent Claim
38 words
A process according to claim 1 characterised in that the packaging (38) is of a bottle-like configuration and the inner container (42) is anchored to the outer container in the region of the neck (68) of the bottle.
Claim 9
Dependent Claim
59 words
A process according to claim 7 characterised in that, to produce a positive connection between the outer container (40) and the inner container (42) in the region of the neck (68) of the bottle, the neck is provided with at least one groove-like depression which preferably extends therearound and/or at least one bead-like projection (69) which preferably extends therearound.
Claim 10
Dependent Claim
93 words
A process according to claim 7 characterised in that the outside diameter of the tubular preform (16) is larger, at least in a portion of the neck (68) to be produced on the packaging (38), than the outside diameter of the associated region of the blowing mould (12) and when the blowing mould is closed excess material is squeezed off the preform (16) with the simultaneous formation of at least one welded seam on the inner portion (20), without a welded seam being produced on the outer portion (18) at the same time.
Claim 11
Dependent Claim
38 words
A process according to claim 1 characterised in that, in the operation of shaping the packaging (38), the end region of the inner tubular preform (20) is bent outwardly over the end (70) of the outer container (40).
Claim 12
Dependent Claim
42 words
A process according to claim 1 characterised in that suitable distribution of the wall thickness of the inner container (42) provides that the inner container is compressed in a controlled manner in the emptying operation under the effect of the pressure difference.
Claim 13
Dependent Claim
37 words
A process according to claim 11 characterised in that in the emptying operation the reduction in volume of the inner container (42), which begins at an end region thereof, progresses in a direction towards the other end.
Claim 14
Dependent Claim
51 words
A process according to claim 12 characterised in that, when there is a dip tube (76) in the packaging (38), the inner container (42) is compressed under the effect of the pressure difference from above downwardly so that the filling material is displaced into the lower region of the inner container.
Claim 15
Dependent Claim
164 words
A packaging (38) which is provided with a closable opening and which is produced by a co- extrusion blow moulding process and which is provided with an outer container (40) which is substantially rigid in respect of shape and within which is arranged a container (42) of flexible material for accommodating the filling material, wherein the outer container (40) and the inner container (42) comprise different thermoplastic materials which do not become joined together and the inner container (42) is sealingly closed by a welded seam at its bottom end, characterised in that at its bottom end the outer container (40) has at least one opening (57) which is defined by two mutually oppositely disposed wall regions (44, 46) in such a way that the region between the outer container (40) and the plastically deformable bag-like inner container (42) can be communicated with the ambient atmosphere in such a way that the pressure of the surrounding atmosphere acts permanently on the inner container (42).
Claim 16
Dependent Claim
164 words
A packaging (38) which is provided with a closable opening and which is produced by a co- extrusion blow moulding process and which is provided with an outer container (40) which is substantially rigid in respect of shape and within which is arranged a container (42) of flexible material for accommodating the filling material, wherein the outer container (40) and the inner container (42) comprise different thermoplastic materials which do not become joined together and the inner container (42) is sealingly closed by a welded seam at its bottom end, characterised in that at its bottom end the outer container (40) has at least one opening (57) which is defined by two mutually oppositely disposed wall regions (44, 46) in such a way that the region between the outer container (40) and the plastically deformable bag-like inner container (42) can be communicated with the ambient atmosphere in such a way that the pressure of the surrounding atmosphere acts permanently on the inner container (42).
Claim 17
Dependent Claim
57 words
A packaging according to claim 14 characterised in that the opening on the outer container through which the region (58) between the outer container (40) and the inner container (42) is communicated with the ambient atmosphere is disposed at the bottom (52) of the outer container (40) and is produced by excess material (24) being squeezed off.
Claim 18
Dependent Claim
26 words
A packaging according to claim 14 characterised in that the inner container (42) comprises at least two layers of different materials, which are firmly bonded together.
Claim 19
Dependent Claim
39 words
A packaging according to claim 14 characterised in that the packaging (38) is of a bottle-like configuration and the inner container (42) is anchored to the outer container (40) in the region of the neck (68) of the bottle.
Claim 20
Dependent Claim
103 words
A packaging according to claim 14 characterised in that in the region of the neck (68) of the bottle the inner container (42) is provided with at least one welded seam which extends over at least a portion of the length of the neck of the bottle and the bottle neck of the outer container (40) is divided substantially parallel to its longitudinal axis and both parts of the neck of the outer container (40) clamp regions of the neck of the inner container under the effect of a banding means which extends around the neck of the bottle on the outside thereof.
Claim 21
Dependent Claim
37 words
A packaging according to claim 18 characterised in that the banding means is formed by a member (74) which can be screwed on to the external screwthread (66) on the bottleneck (68) of the outer container (40).
Claim 22
Dependent Claim
60 words
A packaging according to claim 14 characterised in that the outer container (40) and the inner container (42) are provided with at least one groove-like depression extending therearound and/or at least one bead-like projection (69) extending therearound, and the depression and projection on the inner container (42) and the outer container (40) provide a positive connection between the two containers.
Claim 23
Dependent Claim
38 words
A packaging according to claim 14 characterised in that the free end region of the bottleneck (68) of the inner container (42) is bent outwardly over the end (70) of the bottleneck (68) of the outer container (40).
Claim 24
Dependent Claim
42 words
A packaging according to claim 14 characterised in that suitable distribution of the wall thickness of the inner container (42) provides that in the emptying operation the inner container is compressed in a predetermined fashion under the effect of the pressure difference.
Claim 25
Dependent Claim
30 words
A packaging according to claim 14 characterised in that it is provided with a dip tube (76) which extends to close to the bottom end of the inner container (42).
Claim 26
Dependent Claim
30 words
A packaging according to claim 23 characterised in that the dip tube (76) is provided with at least one additional opening (88) at a spacing from its bottom opening (78).
Claim 27
Dependent Claim
34 words
A packaging according to claim 14 characterised in that it is provided at its emptying opening with a pump (74) by means of which the pressure within the inner container (42) can be reduced.
References Cited (Backward Citations)
No citation records indexed.
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