Method of making wide mouth blow molded container

A method of making a blow-molded PET container having an externally-threaded wide mouth finish for receiving a removable closure, comprising the steps of:

• disposing a preform in a mold cavity having a mold surface with body, dome and base portions, which include a container body forming region, a thread forming region superadjacent said body forming region, and a moil forming region superadjacent said thread forming region, said moil forming region having at least one recess extending radially inwardly of the mold surface immediately superadjacent said thread forming region, said preform having an interior surface and an exterior surface that was pre-heated to a temperature in a range of about 104° C. to about 106° C. in said thread forming region thereof,
• distending said pre-heated preform against said mold surface to form an intermediate container article having a moil portion with a flange region extending radially outward of a superadjacent threaded portion, said mold surface being maintained at a temperature in a range of about 138° C. to about 143° C. in said thread forming region,
• cooling said thread forming interior surface by bayalage gas at a temperature in a range of about 20° C. to about 40° C. for a time period in a range of about 0.5 to about 1.5 seconds, and
• severing said moil portion radially between said radially-extending flange region and said threaded portion to produce a wide mouth container.

A method of making a blow-molded PET plastic container having an externally-threaded wide mouth finish for receiving a removable closure, comprising the steps of:

• disposing a pre-heated preform in a mold cavity having a surface with a container body forming region, a thread forming region superadjacent said body forming region, and a moil forming region superadjacent said thread forming region, said moil forming region having at least one recess extending radially inwardly of the mold surface immediately superadjacent said thread forming region, said preform having an interior surface and an exterior surface that was specially preheated in said thread forming region thereof;
• distending said pre-heated preform against said mold surface maintained at a temperature in a range of about 138° C. to about 143° C. to form an intermediate container article having a moil portion with a flange region extending radially outward of a superadjacent threaded portion thereof,
• cooling said thread forming interior surface by directing gas thereagainst to lower the temperature of said thread forming region to less than about 80° C. before the blown preform is ejected from said mold, and
• severing said moil portion radially between said radially-extending flange region and said threaded portion to produce a wide mouth container.

A method of making a blow-molded PET plastic container having an externally-threaded wide mouth finish for receiving a removable closure, comprising the steps of:

• disposing a pre-heated preform in a mold cavity having a surface with a container body forming region, a thread forming region superadjacent said body forming region, and a moil forming region superadjacent said thread forming region, said moil forming region having at least one recess extending radially inwardly of the mold surface immediately superadjacent said thread forming region, said preform having an interior surface and an exterior surface that was preheated in said thread forming region thereof to a temperature different than the remainder of the preform;
• distending said pre-heated preform against said mold surface which is maintained at a temperature in a range of about 138° C. to about 143° C. to form an intermediate container article having a moil portion with a flange region extending radially outward of a superadjacent threaded portion thereof,
• cooling said thread forming interior surface by directing cooling gas to lower the temperature of said thread forming region to less than about 80° C. before the blown preform is ejected from said mold, and
• severing said moil portion radially between said radially-extending flange region and said threaded portion to produce a wide mouth container having a threaded finish with a crystallinity in a range of about 20-25% and a substantially uniform thickness in a range of about 1.0-1.2 mm.