Flexible bags – With closure – Self-closing type
Patent
1990-06-06
1992-06-16
Garbe, Stephen P.
Flexible bags
With closure
Self-closing type
383 93, 383904, 493199, 493210, 604415, B65D 3024
Patent
active
051219964
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to ports for incorporation in flexible fluid containers, and processes for their manufacture. It is particularly applicable to ports and containers which are used in the medical field.
For some time now, sterile fluids for medical administration have been packaged in flexible containers. The ports used for filling the containers, addition of drugs, administration, etc., have been circular in cross-section. This form of construction imposes limitations on the types of materials and the methods of manufacture that may be utilised.
According to one aspect of the present invention there is provided a method of making a container comprising a body made of superimposed body layers of flexible plastics film and a port sealed between said body layers, said port comprising superimposed port layers of flexible plastics film material which are sealed along opposite sides so as to form a central channel and wherein a layer of non-sealable material is located in said channel during sealing of the port to the container body, so as to prevent the opposing surfaces of the channel, from being sealed together, said non-sealable layer being thereafter removed; characterised in that the port is formed from one or more webs of material arranged so as to provide a pair of outer port layers and a pair of inner port layers, wherein said inner port layers, are united together at one end thereof and united to respective outer port layers at the other end thereof; and in that the layers of the container body are sealed to the adjacent outer layers of the port.
It is also preferred that the inner layers of the port should be sealed to the outer layers so as to provide reinforced walls for the port.
According to another aspect of the invention there is provided a container comprising a body made from superimposed layers of flexible plastics film material and a port sealed between said layers, characterised in that the port comprises a pair of outer layers and a pair of inner layers wherein said inner layers are united together at one end thereof and united to respective outer layers at the other end thereof, the inner layers being sealed together along opposite sides, so as to define a channel open at one end, the port being sealed between the layers of the container body by a seal transversely of the port in a region occupied by the channel, the outer layers of the port being sealed to adjacent layers of the container body and to adjacent inner layers of the port without the inner layers being sealed to each other by said transverse seal.
Preferably the two inner layers of the port are formed from a single web of material which has been folded back on itself so that the layers are united at said one end by a fold in the material.
Preferably, the union of one of the inner layers and its respective outer layer is offset longitudinally of said channel with respect to the union of the other inner layer and its respective outer layer, so as to form a lip at the entrance of the channel.
Preferably the region of the port between the seal of the outer layers with the container body and the union of the ends of outer layers with the respective inner layers comprises a continuous seal between the outer layers and the respective inner layers so as to form reinforced walls for the port.
The invention also includes ports for use in making containers hereof, and methods of making such ports.
In order that the present invention may be better understood, various embodiments are described, by way of example only, with reference to the accompanying drawings, wherein:
FIG. 1 shows a perspective view of the port before sealing;
FIG. 2 shows a side view of an alternative construction of the port before sealing;
FIG. 3 shows a plan view of a completed port;
FIG. 4 shows a perspective view of a modified method of making the port;
FIG. 5 shows a plan view of the assembly of the port and container body;
FIG. 6 shows a plan view of the port sealed to the container body;
FIG. 7 shows a plan view of an alternative embodiment of a f
REFERENCES:
patent: 2378503 (1945-06-01), Rohdin
patent: 2682902 (1954-07-01), Metzger
patent: 3017070 (1962-01-01), London
patent: 3279330 (1966-10-01), Harding
patent: 3337117 (1967-08-01), Lehmacher et al.
patent: 3384294 (1968-05-01), Astle
patent: 3474789 (1969-10-01), Soto
patent: 3839128 (1974-10-01), Arai493214
DRG Flexpak Limited
Garbe Stephen P.
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