Packaging Bag Structure

A packaging bag has a bag body. A body shaping member is disposed inside the bag body to maintain the packaging bag so as to provide a hexahedron shape. The bottom surface portion includes: a lower end seal portion formed by sealing a portion of a lower extending portion; a triangular folded portion surrounded by a reference line and oblique lines, in which a portion of the lower extending portion extending downward from the side surface portion is folded toward a center side of the packaging bag with the reference line corresponding to the lower end of the shaping member.

And a reference point corresponding to the lower edge of the lower sealing portion at the central portion in the longitudinal direction of the packaging bag and an apex point corresponding to the lower end of the shaping member at the longitudinal end edges of the extending portion from the side surface portion are connected and folded so as to provide inward a protrude portion; and a flat surface folding portion in which, at the lower extending portion, the lower end of the shaping member extending from the flat surface portion is folded centrally of the packaging bag as a reference line so as to accord with the triangular folding portion.

plastic packaging bags

A packaging bag either of two layer structure comprising an outer layer and an inner layer or of three layer structure comprising an outer layer, an intermediate layer, and an outer layer is disclosed, wherein the outer layer is made of a low density ethylene-based polymer or a mixture of said ethylene-based polymer and an ethylene-vinyl acetate copolymer, and the inner or intermediate layer is made of a mixture of high density polyethylene and an ethylene-α-olefin copolymer.

The packaging bag of this invention is much superior in film puncture strength, tears strength, etc. to conventional bags and moreover shows very high seal strength and low temperature impact resistance. Moreover, the packaging bag has good anti-block properties and thus is suitable for automatic packaging.

Source: www.freepatentsonline.com

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