A novel carton forming apparatus has a travel path along which carton members move in rapid, continuous succession, when the machine is in operation. During such movement, intermittently movable means fold an entire longitudinal wall portion of the blank inwardly at substantially one time; means is also provided to effect contact between the wall portion so folded and a cooperating portion, in such a manner that substantially all of an area that has been rendered adhesive thereon is contacted and bonded at the same time. Novel feed mechanisms provide carton blanks in rapid succession to transport means of the machine, and novel folding mandrels and/or stationary mandrel elements may be used to effect the folding of the blanks. The invention also provides a method whereby cartons having a desirably rectilinear configuration can be formed at high production rates.
CROSS REFERENCE TO RELATED APPLICATION
The present application is a continuation in part of application Ser. No. 26,653, filed Apr. 8, 1970 and now abandoned.
A method and apparatus are disclosed for production of containers for packaging liquids. Plastic-coated supporting material is drawn as a web from a supply roll in a first direction along a web path. At a first position, the web is cut into sheets. The sheets are conveyed along a transport path in a second direction transverse to the web path. At a second position, each sheet is partially shaped into a tube, and an edge of the sheet is folded over and sealed. At a third position, shaping is completed to cause the side edges of the sheet to join, and the tube side is sealed. A plastic lid is molded onto the top of each tube, and the bottom end is folded and sealed into a quadrilangular bottom.
