Method of manufacturing trapezoid-shaped plastic zipper bags

A process for making a non-rectangular zipper closeable plastic bags of depth x comprising the steps of:

• (a) providing a first elongate plastic sheet of width x, the first plastic sheet having a first edge and an opposed parallel second edge, both the first edge and the second edge of the first elongate plastic sheet having a plastic zipper strip component;
• (b) providing a second elongate plastic sheet of width x, the second plastic sheet having a first edge and an opposed parallel second edge, both the first edge and the second edge of the second elongate plastic sheet having a plastic zipper strip component;
• (c) aligning the first plastic sheet in abutment with the second plastic sheet, such that the respective zipper components along the edges of both plastic sheets are aligned to form a pair of opposed zipperable side edges;
• (d) sealing the first plastic sheet to the second plastic sheet along a plurality of spaced apart transverse sealing lines disposed at non-right angles with respect to the side edges of the first and second plastic sheets to thereby form a plastic bag strip comprising a plurality of plastic bags, each having a pair of opposed side edges, an upper edge and a lower edge, side edges of each plastic bag which abut a side edge of an adjoining plastic bag being attached to the side edge of the adjoining plastic bag along a transverse sealing line, and each upper edge and each lower edge of each plastic bag having a functioning zipper;
• (e) sealing the lower edges of each plastic bag along the plastic bag sheet by further sealing the first plastic sheet to the second plastic sheet along a sealing line disposed parallel to and proximate to the zipper on the lower edges of each plastic bag along the plastic bag strip;
• and
• (f) separating each plastic bag along the plastic bag strip by cutting the plastic bag strip along the transverse sealing lines so as to yield a plurality of individual plastic bags having a pair of opposed side walls, three sealed edges and one opening edge, which opening edge is sealable by a zipper disposed along the opening edge.