Perforated flap with dual seals

A method for forming a tamper resistant closure on a plastic bag containing a product comprising the steps of:

• forming a row of perforations in the bag;
• gripping the bag at spaced positions adjacent the row of perforations;
• and
• directing temperature controlled air to impinge against the bag between the gripped positions for forming a pair of spaced sealed strips adjacent the row of perforations.

Apparatus for forming a tamper evident closure on a plastic bag containing a product comprising:

• means for gripping spaced portions of the bag;
• means for forming a row of perforations in the bag adjacent the gripped portions of the bag;
• and
• means for delivering temperature controlled gas to impinge against the surfaces of the bag between the gripped portions for fusing portions of the bag between the gripped portions for forming hard and soft sealed strips, said perforations being positioned to permit removal of the hard sealed strip.

Apparatus for forming a tamer resistant closure on a plastic bag containing a product comprising:

• a conveyor for moving a plastic bag containing a product along a path, said bag having an open end forming a neck extending beyond the product in the bag;
• an air nozzle for flattening the open neck as the bag is moved by said conveyor;
• a pair of upper brushes and a pair of lower brushes, a first of said pair of upper and lower brushes having bristles arranged to engage the flattened neck of the bag and draw the bag transversely across said conveyor, second upper and lower brushes having angularly inclined bristles for moving the leading edge of the bag neck longitudinally of the conveyor while the trailing edge of the bag neck is engaged by the first upper and lower brushes;
• a pair of upper belts and a pair of lower belts, said upper and lower belts being horizontally spaced apart such that one of said upper belts and one of said lower belts engage opposite sides of a portion of the neck of the bag and one of said upper belts and one of said lower belts engages a second portion of said bag neck such that a portion of the bag neck bridges space between the upper pair of belts and the lower pair of belts;
• a perforator wheel adjacent one side of said bag neck and an anvil having a slot formed therein adjacent the other side of the bag neck, said perforator wheel forming a row of perforations in the neck of the bag moved by said upper and lower belts;
• and
• upper and lower air dispensers positioned to deliver heated air to impinge against upper and lower surfaces of the portion of the bag neck bridging between the belts for melting and forming a sealed strip across the entire width of the bag neck for forming a seal extending generally parallel to the row of perforations formed in the bag neck.