Abstract 1. In the method of rapidly forming plastic containers using a blow pin containing flow porting for passing blow gas through the pin for application to the article, the pin including first and second sections that are relatively movable to valve control in porting, the second section being tubular and having a bore and the first section including a tubular plunger slidable within said bore and a portion projecting from and second portion, said porting having radial extend between said sections, the steps that include (a) forming a plastic parison about said projecting portion of the first section and about said porting at the periphery of the second section thereby effecting relative movement of said sections to fully collapsed condition and reduction in cross-sectional area of said porting radial extend, and positively blocking at the porting said section relative movement to prevent complete closure at all times of said porting radial extend to allow gas flow radially inwardly from the periphery of the second section to the interior of the plunger, said forming step being carried out by relatively inserting the pin into an injection mold cavity prior to said injection forming, said injection forming being carried out to fill the cavity about the pin with injected plastic material under pressure and to an extend overlying the partly open porting at the pin exterior, said relative movement being carried out by transmitting force to said first section from said injected plastic material, said porting communicating with the exterior of the blow pin being maintained in such near closed position by maintenance of said sections in said collapsed condition that plugging thereof by the injected plastic is precluded, and (b) withdrawing the pin and formed plastic parison thereon from the injection mold cavity and relatively inserting the pin with a formed plastic parison thereon into a blow mold cavity, and while the sections remain in said fully collapsed condition, and thereafter applying blow gas pressure to said first section plunger to effect relative movement of the first section from fully collapsed to extended position relative to the second section thereby increasing the opening of said porting, and continuing said blow gas pressure application to flow through the pin via the increasingly opened porting to the pin exterior to expand the parison into container shape, the sections during said forming and withdrawal steps and prior to said blow pressure application being maintained free for said relative movements under the influence of pressure exerted by blow gas and injected plastic parison material.
In the method of rapidly forming plastic containers using a blow pin containing flow porting for passing blow gas through the pin for application to the article, the pin including first and second sections that are relatively movable to valve control in porting, the second section being tubular and having a bore and the first section including a tubular plunger slidable within said bore and a portion projecting from and second portion, said porting having radial extend between said sections, the steps that include (a) forming a plastic parison about said projecting portion of the first section and about said porting at the periphery of the second section thereby effecting relative movement of said sections to fully collapsed condition and reduction in cross-sectional area of said porting radial extend, and positively blocking at the porting said section relative movement to prevent complete closure at all times of said porting radial extend to allow gas flow radially inwardly from the periphery of the second section to the interior of the plunger, said forming step being carried out by relatively inserting the pin into an injection mold cavity prior to said injection forming, said injection forming being carried out to fill the cavity about the pin with injected plastic material under pressure and to an extend overlying the partly open porting at the pin exterior, said relative movement being carried out by transmitting force to said first section from said injected plastic material, said porting communicating with the exterior of the blow pin being maintained in such near closed position by maintenance of said sections in said collapsed condition that plugging thereof by the injected plastic is precluded, and (b) withdrawing the pin and formed plastic parison thereon from the injection mold cavity and relatively inserting the pin with a formed plastic parison thereon into a blow mold cavity, and while the sections remain in said fully collapsed condition, and thereafter applying blow gas pressure to said first section plunger to effect relative movement of the first section from fully collapsed to extended position relative to the second section thereby increasing the opening of said porting, and continuing said blow gas pressure application to flow through the pin via the increasingly opened porting to the pin exterior to expand the parison into container shape, the sections during said forming and withdrawal steps and prior to said blow pressure application being maintained free for said relative movements under the influence of pressure exerted by blow gas and injected plastic parison material.
Claim 2
Dependent Claim
418 words
In the method of rapidly forming plastic containers using a blow pin containing flow porting for passing blow gas through the pin for application to the article, the pin including first and second sections that are relatively movable to valve control in porting, the second section being tubular and having a bore and the first section including a tubular plunger slidable within said bore and a portion projecting from and second portion, said porting having radial extend between said sections, the steps that include (a) forming a plastic parison about said projecting portion of the first section and about said porting at the periphery of the second section thereby effecting relative movement of said sections to fully collapsed condition and reduction in cross-sectional area of said porting radial extend, and positively blocking at the porting said section relative movement to prevent complete closure at all times of said porting radial extend to allow gas flow radially inwardly from the periphery of the second section to the interior of the plunger, said forming step being carried out by relatively inserting the pin into an injection mold cavity prior to said injection forming, said injection forming being carried out to fill the cavity about the pin with injected plastic material under pressure and to an extend overlying the partly open porting at the pin exterior, said relative movement being carried out by transmitting force to said first section from said injected plastic material, said porting communicating with the exterior of the blow pin being maintained in such near closed position by maintenance of said sections in said collapsed condition that plugging thereof by the injected plastic is precluded, and (b) withdrawing the pin and formed plastic parison thereon from the injection mold cavity and relatively inserting the pin with a formed plastic parison thereon into a blow mold cavity, and while the sections remain in said fully collapsed condition, and thereafter applying blow gas pressure to said first section plunger to effect relative movement of the first section from fully collapsed to extended position relative to the second section thereby increasing the opening of said porting, and continuing said blow gas pressure application to flow through the pin via the increasingly opened porting to the pin exterior to expand the parison into container shape, the sections during said forming and withdrawal steps and prior to said blow pressure application being maintained free for said relative movements under the influence of pressure exerted by blow gas and injected plastic parison material.