Plastic bag making apparatus

An apparatus for successively making plastic bags each of which includes side gusset portions incorporated into superposed two layers of panel portion, the apparatus comprising:

• panel material feeding means by which webs of panel material are superposed into two layers and fed longitudinally thereof;
• side gusset material supply means by which webs of side gusset material are folded into halves and supplied to extend longitudinally of the webs of panel material, the webs of side gusset material being spaced from and opposed to each other widthwise of the webs of panel material, the webs of side gusset material being divided into sheets of side gusset material each of which has a length, the sheets of side gusset material being spaced from each other longitudinally of the webs of panel material, the sheets of side gusset material being interposed between the layers of panel material;
• and
• longitudinal seal means by which the layers of panel material are heat sealed with the sheets of side gusset material longitudinally of the webs of panel material after the sheets of side gusset material are interposed so that longitudinal sealed portions can be formed longitudinally of the webs of panel material, the plastic bag including the side gusset portions formed by the sheets of side gusset material and incorporated into the layers of panel portion formed by the webs of panel material, the plastic bag further including side edges formed by the longitudinal sealed portions.