hollow articles of thermoplastics , especially bottles , are made from tubular blanks by heating the ends thereof and press molding first their bottom and neck portion . then the preformed blanks are heated around their center portion and are transferred into blow molds for inflating them to the final shape . the machine consists of a first rotary table with preheating and press molding means , a second rotary table with final heating means and a third rotary table with blow molds . the rotary tables are connected by transfer stations so that the blanks can be automatically transmitted and conveyed around all tables . the high throughput allows installation before racking plants .