Sachets for bio-pharmaceutical fluid products
AssigneeStedim, Z. I. des Paluds
InventorBernard Vallot
Life of this patent
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Abstract
A flexible sachet for transporting bio-pharmaceutical liquids with a volume of 50 liters or more, of the bellows type, assumes when filled a substantially parallelepiped shape. It comprises a bottom wall, a top wall and four lateral walls. It is made of a single laminated film with three or more layers, the innermost layer being a plastics material layer that can be heat welded and is biocompatible with the media transported. A method of manufacturing the sachet is also disclosed.
Claims9
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;
- and
- further heat welding the stacked films to produce the bottom wall and the top wall.
A method of manufacturing a flexible expandable sachet for transporting bio-pharmaceutical liquids 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, said method comprising:
- making a top film, a bottom film and two lateral films, said lateral films being folded over 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;
- and
- further heat welding the stacked films to produce the bottom wall and the top wall;
- wherein top and bottom sachet welds are K welds and branches of the K welds are inclined at an angle in the range of 30° to 60° relative to a longitudinal axis of the stacked films;
- wherein one or two or three successive welds are effected at the position of a given weld;
- wherein said successive welds are made at different temperatures.
A method of manufacturing a flexible expandable sachet for transporting bio-pharmaceutical liquids 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, said method comprising:
- making a top film, a bottom film and two lateral films, said lateral films being folded over 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;
- and
- further heat welding the stacked films to produce the bottom wall and the top wall;
- wherein an external layer of said single laminated film has an insulating effect to heat welding.
Dependencies are inferred from the claim text.