Patent ID: 8221851

Claim:
A process for treating in a treatment furnace the coating of bottles made of thermoplastic material coming from a plant where each bottle is held by its aperture by means of evenly distributed specific gripping devices moved by a conveyor chain, dipped into a resin solution in a solvent in order to create a protective and impermeable-to-gas layer on the outer surface of the bottle, excess paint is appropriately removed, and said solvent is evaporated, the drying process comprising the steps of: i. Feeding the bottles through a first area of the treatment furnace located under spaced out heating elements; ii. Providing an air flow from outside the treatment furnace into said first area of the furnace directed upwardly, first, around the bottles and, then, around said heating elements; iii. Sending said bottles, after feeding them under the heating elements, into a second area of the furnace, which is located above said heating elements; iv. Allowing the airflow, which has already flowed around said heating elements, to flow around the bottles in said second area; v. Mixing at least part of the hot airflow flowing out of said second area with air obtained from outside before sending a refreshed airflow to said first area of the furnace.