FLEXIBLE CONTAINER

Abstract: A container for use in aseptic packaging which contains a resilient plug (8) to seal the container. The plug (8) is attached to the periphery of the inlet opening by resilient straps (10) which allow the plug (8) to be pushed into the opening to close it and which allow the plug (8) to be displaced to open the container by pressure of product flow into the container.

Description: This invention relates to improvements in flexible containers for storing and transporting flowable products. Flexible containers of sizes up to 200 litres are conventionally used for storage and transport of liquid food products. European patents 007,685 and 072,699 disclose a packaging system which enables a flexible package to be filled and emptied through a single orifice which can be sealed by heat sealing flap across the opening. Australian patent applications 58187/86 and 61207/86 disclose a variation to this construction where the opening can be closed by a plug attached to the opposite wall of the package. In both cases, the packages can be pre-sterilized and used for aseptic filling. They can be resealed at the filling station and the product can be dispensed through the same orifice. The container disclosed in Australian patent applications 58187/86 and 61207/86 has the defect that if the flexible container is lifted by grasping the side walls, because the plug connection and the opening are attached to opposite walls, undue stress is placed on the plug seal and leakage of contents can occur which in turn can lead to spoilage of the product. The flexible containers of European patents 007,685 and 072,699 do not suffer from this defect but they do require heat sealing equipment for sealing and a puncturing tool for dispensing. It is an object of this invention to provide a flexible container for aseptic filling which overcomes these defects. To this end, the present invention provides a flexible container for use in aeptic filling and storage which includes an opening in a wall thereof having connected to its periphery a plug for sealing engagement with said opening, said connection being a resilient connection arranged to enable said plug to be sealingly engaged by pushing the plug toward the opening. The plug needs to be a tight sealing fit into the inlet/outlet orifice. The plug can be detached by pressure from outside of the container and resealing can be achieved by applying pressure through the opposite wall of the container. Desirably the plug is secured to the periphery of the inlet/outlet opening by resilient connections which keep the plug correctly oriented to ensure that resealing achieves a tight secure seal. The plug and attachment means is preferably composed of synthetic plastic material similar in nature to the inlet/outlet orifice in the wall of the container. By this construction the plug is not secured to the opposite wall of the container and is not subjected to stress during handling of the container. Likewise, heat sealing of the container is avoided. A preferred embodiment of this invention will now be described with reference to the drawings in which figure 1 is a schematic side view of the inlet/outlet of a flexible container according to this invention figure 2 in a plan view of the orifice of figure 1 and figure 3 schematically shows a plug removed from the orifice to allow filling or dispensing. The container comprises two walls 2 and 3 sealed together at seam 4. The wall contains the inlet/outlet orifice 5 comprising a collar 6 having flanges 7 to which the wall 2 is welded. Attached to the flange 7 is the plug 8 which comprises the body 9 and resilient attachment portions 10. The body portion 9 forms a sealing fit within collar 6 as shown in figure 1. The pressure of liquid product or a plunger can be used to displace the plug 8 as shown in figure 3 to enable filling or dispensing. By using a plunger to contact the body 9 through wall 3 the plug 8 can be re-inserted into collar 6 to seal the opening 5. Preferably the resilient connections 10 enable the body portion to remain aligned with the orifice 5 to ensure correct fitting of the plug 8 into collar 6. From the above, it can be seen that the invention provides a simple means of providing a resealable aseptic container.

Claims: 1. A flexible container for use in aseptic filling and storage which includes an opening (5) in a wall (2, 3) thereof having connected to its periphery a plug (8) for sealing engagement with said opening (5), said connection (10) being a resilient connection arranged to enable said plug (8) to be sealingly engaged by pushing the plug (8) toward the opening (5). 2. A flexible container as claimed in claim 1 wherein the plug (8) is connected to the rim of the opening by a pair of diametrically located resilient connections (10). 3. A flexible container as claimed in claim 1 wherein the plug (8) is connected to the periphery of the opening (5) by a plurality of equally spaced spring connections (10). 4. A flexible container as claimed in claim 3 wherein the opening (5) is formed of a ring (6) of synthetic plastic bonded to the wall of the container and said plug (8) is connected to the ring by integral resilient connecting straps (10).

Inventors: ANDERSON, IAN MCARTHUR
Applicants: COURTAULDS PACKAGING AUSTRALIA LIMITED
Application year: 1988
Main classification: B65D33
IPC codes: B65D33, B65D75, B65D51, B65D47