Part bottom seal of chain of gusseted bags and machine therefor

A bag making machine to make a chain of bags, comprising in combination:

• means to form a flattened elongated tubular structure with first and second panels;
• means to form side gussets each being established by first and second side gusset panels at each side of the tubular structure integrally joined to said first and second panels, respectively, and joined to each other;
• means to form a bottom seal transversely of the flattened tubular structure which seals closed the bottom of the bag;
• and
• means to prevent the sealing together of the outer portion of said gusset panels;
• wherein said bottom seal means together with said preventing means establishes:
• (a) a sealing together of a central portion of said first and second panels on each bag;
• (b) contiguous to said central portion a sealing together of four thicknesses which include the first and second panels and at least the inner portions of said first and second side gusset panels;
• and (c) sealing the outer portion of at least said second side gusset panels together with said second panel in only two thicknesses colinearly with said seal at said central portion.

A bag making machine to make a chain of bags, comprising in combination:

• means to form a flattened elongated structure with face-to-face first and second panels;
• means to form side gussets each being established by first and second side gusset panels at each side of the elongated structure integrally joined to said first and second panels, respectively, and joined to each other to form an elongated tubular gusseted structure;
• means to form a bottom seal transversely of the flattened tubular gusseted structure which seals closed the bottom of each gusseted bag in the chain;
• and
• means to prevent the sealing together of the outer portion of said gusset panels;
• whereby said bottom seal means together with said preventing means establishes:
• (a) a sealing together of a central portion of said first and second panels on each bag;
• (b) contiguous to said central portion a sealing together of four thicknesses which include the first and second panels and at least the inner portions of said first and second side gusset panels;
• and (c) sealing the outer portion of at least said second side gusset panels together with said second panel in only two thicknesses colinearly with said seal at said central portion.