Electrostatic production of gummed web

Claim 1

COATING APPARATUS FOR PROVIDING AN ADVANCING WEB WITH A COATING CONSISTING ESSENTIALLY OF A FINELY DIVIDED SUBSTANTIALLY NONTHERMOPLASTIC MATERIAL AND A FINELY DIVIDED THERMOPLASTIC BINDER MATERIAL, COMPRISING A DRIVEN BACKING DRUM, HOOD MEANS DEFINING A COATING CHAMBER OVERLYING AN ANGULAR PORTION OF THE SURFACE OF SAID DRUM, MEANS DEFINING ENTRY AND EXIT SLOTS FOR THE WEB WITH RESPECT TO SAID CHAMBER, MEANS INCLUDING AN ENTRY DUCT LEADING TO SAID ENTRY SLOT FOR SUPPLYING TO SAID CHAMBER A MIXTURE OF SAID FINELY DIVIDED MATERIAL, MEANS INCLUDING A PLURALITY OF CHARGING WIRES EXTENDING THROUGH SAID CHAMBER AXIALLY OF SAID DRUM AND IN RADIALLY SPACED OVERLYING RELATION THEREWITH FOR CHARGING SAID FINELY DIVIDED MATERIALS, MEANS FOR CONNECTING SAID WIRES TO A HIGH VOLTAGE SOURCE, MEANS FOR GROUNDING SAID DRUM, MEANS GUIDING THE WEB INTO CONTACT WITH SAID DRUM FROM A POSITION ANGULARLY AHEAD OF SAID ENTRY SLOT TO A POSITION ANGULARLY BEYOND SAID EXIT SLOT TO CAUSE SAID CHARGED MATERIALS TO DEPOSIT ON THE WEB, A HEATED ROLL ARRANGED TO RECEIVE THE UNCOATED SIDE OF THE WEB THEREAROUND FROM SAID CHAMBER TO EFFECT FUSION OF SAID THERMOPLASTIC MATERIAL IN THE COATING ON THE WEB, A CHILLED ROLL ARRANGED TO RECEIVE THE UNCOATED SIDE OF THE WEB FROM SAID HEATED ROLL TO EFFECT SETTING OF SAID FUSED MATERIAL, AND A PAIR OF ROLLS FORMING A PRESSURE NIP ARRANGED TO RECEIVE THE WEB FROM SAID CHILLED ROLL TO EFFECT CALENDERING OF SAID COATING.