Patent ID: 6186932
Filing Date: 2001-02-13
Classification: A61J,B65D,C12M

Abstract:
A method of manufacturing a flexible expandable sachet for transporting bio-pharmaceutical liquids with a volume of 50 liters or more and having a bellows construction which, when filled, takes on a substantially parallelepiped shape, the sachet comprising a bottom wall, a top wall and four lateral walls made of a single laminated film having at least three layers, an innermost layer of said layers being formed of plastic which is heat weldable and biocompatible with the bio-pharmaceutical liquid intended to be transported therein and at least one of (1) a flange on its top face for mounting connectors comprising at least one chimney comprising two substantially cylindrical concentric lips, and (2) a drain bung mounted on an outwardly upstanding base on the bottom of said sachet with an upstanding part of said bung having a non-circular shape, said method comprising:making a top film, a bottom film and two lateral films, bolding said lateral films over themselves from said single laminated film, the innermost layer of said two folded over lateral films being on an exterior thereof with each folded over film having a folded edge;stacking said top film, said bottom film and said two folded over lateral films with said two folded over lateral films located between said top film and said bottom film to bring surfaces of the stacked films into contact with each other with the folded edges of the two folded over lateral films facing one another with a gap therebetween;heat welding outside edges of the stacked films to produce at least two side edges of the four lateral walls at a time; andfurther heat welding the stacked films to produce the bottom wall and the top wall.