초록 ▼

A flexible container comprises first and second flexible sheets of plastic material having peripheral edges, which have been sealed together along a plane to create an interior chamber in the container. At least one of the first and second flexible sheets includes a preformed, stress-relieved region

A flexible container comprises first and second flexible sheets of plastic material having peripheral edges, which have been sealed together along a plane to create an interior chamber in the container. At least one of the first and second flexible sheets includes a preformed, stress-relieved region, which is extended outside the plane and overlies at least a portion of the interior chamber.

대표청구항 ▼

1. A method for making a flexible container comprising the steps ofproviding first and second flexible sheets of plastic material which softens in response to exposure to heat, the first and second flexible sheets having top, side and bottom peripheral edges, forming a first seal region joining the

1. A method for making a flexible container comprising the steps ofproviding first and second flexible sheets of plastic material which softens in response to exposure to heat, the first and second flexible sheets having top, side and bottom peripheral edges, forming a first seal region joining the peripheral side and bottom edges along a plane to create an interior chamber in the container, the peripheral top edge of the container being left unsealed, locating a port tube body between the first and second flexible sheets in the unsealed peripheral top edge, forming a second seal region joining the peripheral top edge along the plane and joining the port tube body within the peripheral top edge, the port tube body providing fluid flow communication with the interior chamber through the second seal region, after forming the first and second seal regions, softening the first and second flexible sheets by exposure to heat, forming heat-softened first and second flexible sheets, and applying positive pressure inside the interior chamber through the port tube body to form in the heat-softened first and second flexible sheets stress-relieved regions extending outside the plane and overlying the interior chamber.