Method for coating glass containers

Claim 1

A method of coating a glass container with a layer of plastic comprising: (a) rotating the container about a horizontal axis, (b) simultaneously applying uncured plastic liquid to a plurality of container surface areas by flow coating said plastic liquid from multiple nozzle means positioned along the length of the container and fixed stationarily with respect to that length, each said nozzle means having a multiple number of application tubes, the amount of uncured plastic liquid applied to each surface area by each nozzle means being independent of the amount of uncured plastic liquid applied to any other surface area, and resulting in an integral coating on the container which after cure resists wear during use and shattering of the bottle when dropped, and (c) curing said plastic liquid which has been applied to said container.

Claim 2

A method of coating a glass container with a layer of plastic comprising: (a) rotating the container about a horizontal axis, (b) simultaneously applying uncured plastic liquid to a plurality of container surface areas by flow coating said plastic liquid from multiple nozzle means positioned along the length of the container and fixed stationarily with respect to that length, each said nozzle means having a multiple number of application tubes, the amount of uncured plastic liquid applied to each surface area by each nozzle means being independent of the amount of uncured plastic liquid applied to any other surface area, and resulting in an integral coating on the container which after cure resists wear during use and shattering of the bottle when dropped, and (c) curing said plastic liquid which has been applied to said container.

Claim 6

A method of coating a glass bottle with a layer of polyurethane comprising: (a) cleaning the bottle to be coated, (b) applying a silane primer to the bottle, (c) mixing a polyether polyol component and an aliphatic diisocyanate component to produce an uncured polyurethane coating composition, (d) metering a predetermined amount of said polyurethane coating compositon into each of four separate nozzle means each having a multiple number of applicator tubes and being positioned along the length of the bottle and fixed stationarily with respect to that length, (e) coating onto the primed bottle from each of said nozzle means as the bottle is rotated about a horizontal axis beneath said nozzle means to flow coat four adjacent zones of the bottle with said polyurethane coating composition to provide an integral coating, (f) heating the coated bottle for a period of time sufficient to cure said polyurethane coating composition while slowly rotating said bottle during heating, and (g) cooling the coated bottle, whereby there is produced a bottle uniformly coated with an integral polyurethane coating which resists wear during use and shattering of the bottle when dropped.

Claim 7

A method of coating a glass bottle with a layer of polyurethane comprising: (a) cleaning the bottle to be coated, (b) applying a silane primer to the bottle, (c) mixing a polyether polyol component and an aliphatic diisocyanate component to produce an uncured polyurethane coating composition, (d) metering a predetermined amount of said polyurethane coating compositon into each of four separate nozzle means each having a multiple number of applicator tubes and being positioned along the length of the bottle and fixed stationarily with respect to that length, (e) coating onto the primed bottle from each of said nozzle means as the bottle is rotated about a horizontal axis beneath said nozzle means to flow coat four adjacent zones of the bottle with said polyurethane coating composition to provide an integral coating, (f) heating the coated bottle for a period of time sufficient to cure said polyurethane coating composition while slowly rotating said bottle during heating, and (g) cooling the coated bottle, whereby there is produced a bottle uniformly coated with an integral polyurethane coating which resists wear during use and shattering of the bottle when dropped.