Coating hood with air flow guide for minimizing deposition of coating compound on finish of containers

A method for applying uniform protective coatings to glass containers having a main body and a finish, said method comprising the steps of:

• (a) transporting the glass containers to be coated longitudinally through a coating hood;
• (b) supplying a coating compound to the main body of said containers as the latter are transported between side walls of said coating hood by at least one coating jet forming means defined in at least one side wall of said coating hood and extending to a height not greater than that of the main body of said glass containers;
• (c) receiving a residual output of said coating material remaining after the main bodies of said glass containers have been coated by at least one receiver defined in at least one side wall, each receiver being situated in a side wall opposite to and in substantial alignment with a respective coating jet forming means for receiving an output therefrom;
• (d) introducing a coating compound into said coating hood through at least one feedpoint;
• (e) delivering air to said coating jet forming means with the coating compound entrained therein by first blower means, wherein the main body of said containers are coated with said coating compound;
• (f) supplying coating free air across the finish of said containers as the latter are transported through said coating hood by a plurality of finish air jet forming means positioned at a height above said coating jet forming means, said finish air jet forming means positioned on opposite sides of said containers, the finish air jet forming means on one side of said containers being offset in the longitudinal direction of said hood with respect to the finish air jet forming means on the other side of the containers;
• (g) said step of supplying coating free air including the step of supplying an envelope of said coating fee air across the finish of said containers such that lateral boundaries of the envelopes of each finish air jet forming means on one side of said containers are substantially coincident with lateral boundaries of the envelopes of the offset and laterally adjacent finish air jet forming means on the other side of said containers;
• (h) said step of supplying coating free air including the step of supplying said coating free air through said finish air jet forming means with a vertical separation of at least 2 cm from the air with the coating compound entrained therein which is supplied from said coating jet forming means;
• and
• (i) supplying said coating free air to said finish air jet forming means by second blower means.

A coating hood for applying protective coatings to glass containers having a main body and a finish, said coating hood comprising:

• (a) a tunnel through which hot glass containers pass;
• (b) means for contacting the outside surface of said containers with a coating chemical to form a metal oxide coating on said outside surface, when said containers are in said tunnel;
• (c) a plurality of finish air jet forming means positioned on opposite sides of the finish of said containers for supplying coating free air across the finish of said containers as the latter are transported through said coating hood;
• (d) the finish air jet forming means on one side of said containers being offset in the longitudinal direction of said hood with respect to the finish air jet forming means on the other side of the containers;
• (e) each said finish air jet forming means supplying an envelope of said coating free air across the finish of said containers such that lateral boundaries of the envelope of each finish air jet forming means on one side of said containers are substantially coincident with lateral boundaries of the envelopes of the offset and laterally adjacent air jet forming means on the other side of said containers;
• (f) said finish air jet forming means being vertically 34 separated from said means for contacting by a distance of at least 2 cm;
• and
• (g) means for supplying said coating free air to said finish air jet forming means.

A method for applying protective coatings to glass containers having a main body and a finish, said method comprising the steps of:

• (a) transporting the glass containers to be coated longitudinally through a coating hood;
• (b) supplying a coating compound to the main body of said containers as the latter are transported between side walls of said coating hood;
• (c) introducing a coating compound into said coating hood through at least one feedpoint;
• (d) delivering a carrier gas to said hood with the coating compound entrained therein;
• (e) supplying coating free air across the finish of said containers as the latter are transported through said coating hood by a plurality of finish air jet forming means positioned on opposite sides of the finish of said containers, the finish air jet forming means on one side of said containers being offset in the longitudinal direction of said hood with respect to the finish air jet forming means on the other side of the containers;
• (f) said step of supplying coating free air including the step of supplying an envelope of said coating free air across the finish of said containers such that lateral boundaries of the envelopes of each finish air jet forming means on one side of said containers are substantially coincident with lateral boundaries of the envelopes of the offset and laterally adjacent finish air jet forming means on the other side of said containers;
• (g) said step of supplying coating free air including the step of supplying said coating free air through said finish air jet forming means with a vertical separation of at least 2 cm from the gas with the coating compound entrained therein;
• and
• (h) supplying said coating free air to said finish air jet means.