Cooling system for parison plunger

A parison plunger having a narrow contoured, upper portion that includes a parison core portion of progressively reduced cross-section and terminating at a nose portion and having a broader shank portion provided with a base portion therein, said parison plunger having a central cooling fluid passage running internally from said broader shank portion to the top of said contoured portion, a series of umbrella passages radiating from the top of the contoured portion downwardly therefrom and around said central cooling fluid passage, said umbrella passages extending the length of said plunger and defining outlets at said base portion, said umbrella passages converging circumferentially and communicating with said central cooling fluid passage within said nose portion, said umbrella passages having a size and/or number such that the total surface area of said umbrella passages is greater than the total surface area of the outer parison contacting surface of said plunger, a tube slideably mounted within said central cooling fluid passage, and means for introducing fluid into said central cooling fluid passage.

A parison plunger having a narrow contoured, upper portion that includes a parison core portion of progressively reduced cross-section and terminating at a nose portion, and having a broader shank portion provided wth a base portion thereon, said parison plunger having a central cooling fluid passage running internally from said broader shank portion to the top of said contoured portion, a series of umbrella passages radiating from the top of the contoured portion downwardly therefrom and around said central cooling fluid passage, said umbrella passages extending the length of said plunger and defining outlets at said base portion, said umbrella passages converging circumferentially and communicating with said central cooling fluid passage within said nose portion, said umbrella passages having a size and/or number such that the total surface area of said umbrella cooling passages is greater than the total surface area of the outer parison contacting surface of said plunger.

A parison plunger for a glassware molding machine, comprising:

• a parison-contacting outer surface forming a plunger base, a plunger nose, and a longitudinal surface therebetween with a progressively reducing circumference;
• and
• conduit means interiorly of the plunger for directing a fluid to adjacent the plunger nose and for permitting an expansion of the fluid adjacent the plunger nose to preferentially remove heat therefrom, and further conduit means for thereafter directing the fluid adjacent the base whereby the parison-contacting surface is effectively cooled, said further conduit means including a plurality of umbrella passageways extending from the plunger base and communicating with said conduit means adjacent said plunger nose, said plurality of passageways extending generally in the direction of the longitudinal outer surface.

A parison plunger for a glassware molding machine, comprising:

• a parison-contacting outer surface forming a plunger base, a plunger nose, and a longitudinal surface therebetween with a progressively reducing circumference;
• and
• conduit means interiorly of the plunger for directing a fluid to adjacent the plunger nose and for permitting an expansion of the fluid adjacent the plunger nose to preferentially remove heat therefrom, and a further plurality of conduits extending from the plunger base and communicating with said conduit means adjacent said plunger nose, said plurality of conduits extending generally in the direction of the longitudinal outer surface and having a total surface area that is greater than the total surface area of the parison contacting outer surface whereby the parison-contacting surface is effectively cooled.