Preformed bag made of flexible plastic material and methods for providing a preformed bag from a film made of flexible material with a rigid frame
AssigneeCoveris Flexibles France
InventorEric Valette
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Abstract
The invention relates to a preformed bag (1) which is manufactured continuously from a film of flexible plastic material, in particular PET/PE, with a thickness of less than 200 microns, in order to form a front wall (1a) and a rear wall (1b) assembled at the lateral sides thereof, optionally in combination with gussets (1c) and (1d), a bottom (1e) and a filling opening (1f). A portion of the bag (1) has arrangements for fastening a rigid frame (2), capable of defining an opening communicating with the inside of the bag, said frame being provided with a sealing means (2a).
Claims15
1-8. (canceled)
A preformed bag manufactured continuously from a film of flexible plastic material with a thickness of less than 200 microns to form a front wall and a rear wall assembled at the lateral sides thereof, a bottom and a filling opening, wherein the front wall and rear wall are optionally assembled at the lateral sides thereof in combination with gussets, wherein a portion of the bag has arrangements for fastening a rigid frame capable of defining an opening communicating with inside the bag, said frame being provided with a sealing means.
A method for providing a preformed bag from a film of flexible plastic material with a thickness of less than 200 microns with a rigid frame, wherein:
- the film of a plastic material is continuously subjected to successive operations of folding and welding, in order to manufacture a bag with a bottom, two walls connected by gussets, and a filling opening opposite the bottom, and
- the filling opening, the bottom, or any of the walls of the preformed bag is arranged to allow for affixing the rigid frame before the bag is fed to a filling machine or after filling of said bag.
A method for providing a preformed bag of a required height from a film of flexible plastic material with a thickness of less than 200 microns, with a frame, wherein:
- the plastic film is continuously subjected to successive operations of folding and welding, in order to manufacture a bag with a bottom, and two walls connected by gussets,
- a transverse cut is made in one of the walls at a determined distance corresponding to the required height of the bag,
- the other wall is folded at an open transverse end in such a way as to open the gussets and position them flat thus forming a triangle,
- the frame is attached to the edges of the internal face of the folded wall, the edges of the internal faces of the gussets arranged as a triangle and on the edge of the inner face of the other wall considered along the bottom.
Dependencies are inferred from the claim text.