Glass production Wikipedia
In the blow and blow process, the glass is first blown through a valve in the baffle, forcing it down into the threepiece ring mould which is held in the neckring arm below the blanks, to form the finish. The term quot;finishquot; describes the details (such as cap sealing surface, screw threads, retaining rib for a tamperproof cap, etc.) at the open end of the container.