Bag manufacturing former laminated films

A method for manufacturing a bag comprising:

• providing a laminated film comprising a gas barrier layer and support layers disposed on both sides of the gas barrier layer;
• and
• forming the laminated film into a bag by guiding the laminated film over a former top of a former,
• wherein a minimum radius of curvature of the former top along a film guiding direction is between a critical radius and 0.5 mm, the critical radius being defined as being a radius of curvature which causes an elastic limit strain at an innermost portion of the support layer immediately outside the barrier layer when the laminated film is bent over the former top.

A laminated film to be fed in a film feeding direction, comprising:

• a first support layer;
• a second support layer;
• and
• a gas barrier layer attached to a surface of the first support layer that is closer to the second support layer,
• wherein the laminated film is configure to yield a strain along the feeding direction at an innermost portion of the first support layer that is less than an elastic limit strain along the feeding direction of the first support layer when the laminated film is bent so that the second support layer is inwardly folded and a minimum radius of an innermost portion of the bent second support layer is 0.2 mm.

A laminated film to be fed in a feeding direction, comprising:

• a first polymer layer;
• a gas barrier layer disposed on the first polymer layer;
• a second polymer layer disposed on the gas barrier layer;
• and
• a third polymer layer,
• wherein the following formula is satisfied:
• (t1/t3)≧(68.4×t2+1.3)×(E1/E3)−0.8
• wherein t1 is a thickness of the first polymer layer, t2 is a thickness of the second polymer layer, t3 is a thickness of the third polymer layer, E1 is an elastic modulus of the first polymer layer along the feeding direction, and E3 is an elastic modulus of the third polymer layer along the feeding direction.