초록

Apparatus and method for wrapping a roll with a welded closed snug envelope of transparent heat shrink plastic film and a label accurately positioned between the roll and envelope away from the weld bead closing the envelope.

대표청구항 ▼

Apparatus for forming a snug transparent film envelope surrounding a roll with a flexible non-rigid label sandwiched between the roll and the envelope, the label having a circumferential extent less than the circumference of the roll, the apparatus including a work area, a positive film feed on one

Apparatus for forming a snug transparent film envelope surrounding a roll with a flexible non-rigid label sandwiched between the roll and the envelope, the label having a circumferential extent less than the circumference of the roll, the apparatus including a work area, a positive film feed on one side of the work area for supplying a pre-measured length of film to a curtain extending across the work area, a demand film feed on the opposite side of the work area for supplying film to the other side of the curtain on demand, a label gripper, a drive for moving the label gripper from a label pickup position remote from the work area to a label release position adjacent the curtain so that the gripper engages a flexible non-rigid label at the pickup position and carries the label to a position in front of the curtain in the path of the roll, and means for moving a roll located in front of the curtain against the label and curtain to wrap the curtain over the roll, fold the label over the roll so as to sandwich the label between the curtain and roll and form a frictional connection there between with the label extending partially around the roll and move the roll, curtain and label past the film seal means as film is first drawn from said positive film feed to rotate the roll and label in a first direction by said friction connection and film is then drawn from said demand film feed to rotate the roll and label in the opposite direction by said friction connection, and tensioning means maintaining said curtain taut during film feeding and forming of the envelope, whereby actuation of the film seal means forms a seal across the curtain closing a snug envelope on the roll and label with the label held in a known position in the envelope and a seal re-establishing the curtain.