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Apparatus and method of forming a tray which includes a bottom panel, four upstanding side panels and corner gussets for sealing and holding the bottom panel end flaps and side flaps in the formed position including means for receiving a stack of precut blanks from which the tray is formed, feeding

Apparatus and method of forming a tray which includes a bottom panel, four upstanding side panels and corner gussets for sealing and holding the bottom panel end flaps and side flaps in the formed position including means for receiving a stack of precut blanks from which the tray is formed, feeding one at a time, the blanks through a glue station for the deposition of a predetermined glue pattern on the corner gussets, and thereafter folding the blank into a tray in a die and mandrel wherein in successive steps the end flaps are folded, the corner gussets are influenced inward and the side flaps are folded to complete the tray. The die and mandrel assembly serves to hold the tray momentarily after formation to permit the glue to adhere and thereafter functions to strip the tray from the mandrel and hold it in a position satisfactory for removal from the assembly.

대표청구항 ▼

A tray forming apparatus for forming a tray from a blank having a bottom panel and side forming panels with a fold line therebetween, said apparatus comprising, in combination: a plurality of mandrel assemblies having a forming head about which the blank can be folded to form the tray; a die assembl

A tray forming apparatus for forming a tray from a blank having a bottom panel and side forming panels with a fold line therebetween, said apparatus comprising, in combination: a plurality of mandrel assemblies having a forming head about which the blank can be folded to form the tray; a die assembly to cause folding of the blank about the forming head with passage of each mandrel assembly therethrough; a stripping head mounted in each mandrel assembly for movement relative to the forming head to remove the formed tray from the forming head; means to position a blank onto each forming head; means to effect relative movement between the die assembly and each forming head to move the forming heads through the die assembly in succession to form the blank about each forming head; means to cause movement of the stripping head relative to the forming head to strip the formed tray therefrom and clamp the formed tray between the stripping head and the next adjacent mandrel assembly; and means to remove the formed tray from the mandrel assembly.