Contact Between Hot Glass And Wet Porous Materials - Part 2. Trials On A Continuously Operating Container Forming Machine.

The narrow neck press and blow process for the production of lightweight bottles uses a slender plunger. It is suspected that the plunger decreases the bursting strength and above all the impact resistance of the bottles by damaging the inner glass surface of the parison. It was the aim of the project to develop a "steam plunger" using a wet porous material, which would protect the glass surface by a developing steam layer between glass and plunger.