Patent ID: 7331917

Claim:
An apparatus for successively making plastic bags each of which includes a bottom gusset portion incorporated into superposed two layers of panel portion, the apparatus comprising: panel material feeding means by which web means of panel material is fed longitudinally thereof; and panel material guide means by which the web means of panel material is guided to be folded and folded back along a longitudinal folded line and a longitudinal folded back line when being fed so that a folded portion can be formed in the web means of panel material and folded into halves, the panel material guide means comprising: first guide means by which the web means of panel material is guided to be folded along the longitudinal folded line into superposed two layers when being fed; and second guide means by which the web means of panel material is guided to be folded back along the longitudinal folded back line when being fed and after being folded into superposed two layers so that the folded portion can be formed in the web means of panel material and folded into halves, the plastic bag including the bottom gusset portion formed by the folded portion and incorporated into the layers of panel portion which are formed by the web means of panel material.