PLASTIC BAG AND PLASTIC BAG MAKING APPARATUS Russian patent published in 2018 - IPC B65D30/20 B65D33/01 

FIELD: manufacturing of cardboard products.

SUBSTANCE: plastic bag comprises two sheets of panel material superposed with each other to have opposite side edges, and a pair of sheets of side gusset material. Each of the sheets of side gusset material is folded in half, placed between sheets of panel material to produce a folded inner edge and open outer edges and comprises opposite end portions, one of which is folded obliquely along the fold line when folded in half so that the end portion forms a triangular flap in the form of a triangle. Triangle comprises a base formed by the fold line. Each of the sheets of side gusset material also comprises opposite end edges. Triangle also has a vertex formed by intersecting one of the opposite end edges and the folded inner edge of the sheet of gusset material. Triangular flap has a folded side formed by a folded inner edge and an open side formed by the end edge and sheet of panel material. Sheets of side gusset material and triangular flaps are welded together along opposite edges of sheets of panel material. Package has a flow channel for discharging air or gas formed by a notch, a remote portion of the triangular flap, partially formed by an non-welded portion of sheets of panel material, sheet of side gusset material and triangular flap welded together, or the open side of the triangular flap having a base defined by a fold line that is inclined at an angle greater than 45° relative to the open outer edges of the sheet of side gusset material.

EFFECT: invention ensures safe use of the package due to the fact that insects or foreign matter can not enter the flow channel.

15 cl, 18 dwg