Apparatus using removable profile wedges for manufacture of reclosable bag

A method for integrally extruding a film together with closure profiles from a molten stream comprising the steps of:

• feeding said molten material stream into a die, said die comprising:
• a die cavity, a die entrance at a first end of said die and a die exit at a second end of said die, said die cavity is enclosed within said die and said molten material stream enters said die cavity through said die entrance and flows in said die towards said die exit;
• a choker bar mounted within said die and positioned across said die cavity spreads said molten material;
• a removable die lip mounted at said die exit and having a wedge slot, said wedge slot opens toward said molten material stream;
• and
• a removable profile wedge mounted in said wedge slot and including a first end and a second end, said removable profile wedge further including a molten material trough and a profile channel, said molten material trough bordering said first end and said profile channel bordering on said second end and having the outline of a closure profile;
• and extruding a film having closure profiles thereon within said die.

An apparatus for integrally extruding from a molten material stream a film having closure profiles comprising:

• a die having a die cavity, a die entrance at a first end of said die, a die exit at a second end of said die and a choker bar, said die cavity is enclosed within said die, said molten material stream enters said die through said die entrance and flows in said die cavity towards said die exit and said choker bar is mounted within said die across said die cavity and spreads said molten material stream;
• a removable die lip mounted to said die at said die exit and having an extrusion plane that defines a border of said die exit, a first wedge slot and a second wedge slot, said first and second wedge slots are positioned on said extrusion plane and open towards said molten material stream;
• a first removable profile wedge mounted in said first wedge slot, said first removable profile wedge including a molten material trough and a profile channel, said profile channel having the outline of a closure profile;
• and
• a second removable profile wedge mounted in said second wedge slot, said second removable profile wedge including a molten material trough and a profile channel, said profile channel having the outline of a closure profile.

An apparatus for integrally extruding from a molten material stream a film having closure profiles comprising:

• a die having a top half, a bottom half, a die cavity between said top and bottom halves, a die entrance at a first end of said die, a die exit at a second end of said die and a choker bar mounted in said cavity adjacent to said die exit, said molten material stream enters said die through said die entrance and flows between the two halves of the die in the die cavity towards said die exit, said choker bar is mounted within said die and positioned across said die cavity and spreads said molten material stream;
• and
• a removable die lip mounted to said bottom half of said die at said die exit and having an extrusion plane, a first wedge slot and a second wedge slot, said first and second wedge slots are positioned on said extrusion plane and open towards said bottom half of the die and said molten material stream, said removable die lip includes:
• a first removable profile wedge mounted in said first wedge slot, said first removable profile wedge including a molten material trough and a profile channel, said profile channel having the outline of a closure profile;
• and
• a second removable profile wedge mounted in said second wedge slot, said second removable profile wedge including a molten material trough and a profile channel, said profile channel having the outline of a closure profile.