VALVE BAG Russian patent published in 2011 - IPC B65D33/01 

FIELD: packing industry.

SUBSTANCE: wall at the end is closed with a bottom formed by bottom valves. The bottom valves pointing at each other are bent from the side wall at folding lines passing across the longitudinal direction and are covered with their free end edges. The bag comprises a glued bottom closing sheet that covers the bottom valves and a hole for filling formed in the bottom and creating the passage to the inner space of the bag, and the hole is made with the possibility of pulling up to a loading nozzle of the packing machine. The hole for filling is formed between the bottom closing sheet and the bottom valves. The closure of bottom valves is so insignificant that between the free end edges of the bottom valves there is a slot produced as open to the inner space of the bag, when the loading nozzle inserted into the filling hole pushes the bottom valves in direction of the inner space of the bag. In the bag the valve function is achieved without the additional glued valve sheet, since the bottom valves themselves form a self-filling hole.

EFFECT: possibility to fill the bag without dust scattering, has simple design and is easy to recycle.

6 cl, 4 dwg