Method for gas filling of a handle portion of a container
A method for gas filling a handle portion of a container of a collapsible type. The handle portion being defined by two opposite side walls of the container and communicating, via a duct defined by the side walls, with an opening formed in one of the side walls. The method including the steps of supplying, at a gas filling station, a gas to the handle portion via the opening and the duct, blocking the duct by squeezing action to retain the gas supplied to the handle portion, transporting the container to a sealing station while maintaining the squeezing action and, at the sealing station, sealing the duct while maintaining the squeezing action, so as to permanently enclose the gas in the handle portion. The disclosure further concerns a container of a collapsible type.
1. A method for gas filling a handle portion of a container of a collapsible type, the handle portion being defined by two opposite side walls of the container and communicating, via a duct defined by said side walls, with an opening formed in one of the side walls, said duct having, in an inflated state, a cross-sectional area being significantly smaller than a cross-sectional area of the handle portion, the method comprising
supplying, at a gas filling station, a gas to the handle portion via said opening and said duct,
moving said container laterally to a sealing station by a pinching member arranged to grip said container such that a blocking of the duct is obtained by a squeezing action to retain the gas supplied to the handle portion, and
sealing the duct, at said sealing station, by a weld seal extending transverse said duct while maintaining the squeezing action, so as to permanently enclose the gas in said handle portion.
2. A method according to claim 1 , in which the gas is supplied by a gas supply nozzle, which is applied to the opening.
3. A method according to claim 1 , in which the duct is blocked by a squeezing action produced by a movable pinching device, which grips the container for transport thereof from the gas filling station to the sealing station.
4. A method according to claim 3 , in which said pinching device is moved along a curved path from said gas filling station to said sealing station.
5. A method according to any claim 1 , in which the method is a step of a process for producing finished containers.