Preform neck crystallization method

Abstract

A neck crystallization method includes inserting a core into the neck, heating the neck using a heater group disposed along a transfer direction while rotating the preform on its axis, and transferring the preform along the transfer direction in a state in which the core is inserted into the neck, and cooling the neck of the preform in a state in which the core is inserted into the neck. The heating of the neck includes a first step that drives first heaters positioned on the upstream side in the transfer direction at a first power, and a second step that drives second heaters positioned on the downstream side of the first heaters at a second power that is lower than the first power until the temperature of the neck reaches a crystallization temperature zone.

1 .- 10 . (canceled) 
     
     
         11 . A wide-neck container that is made of a synthetic resin comprising:
 a neck;   a body; and   a bottom,   wherein the wide-neck container is configured so that a top side of the neck is sealed by a cap that is fitted to the neck,   wherein the neck includes:   a neck tubular section;   an engagement section that is formed to protrude outward from the neck tubular section, and engages the cap; and   a flange that is formed to protrude outward from the neck tubular section at the top side, a protrusion height of the flange from the neck tubular section being smaller than that of the engagement section,   wherein the top side of the neck includes a first top side formed by the neck tubular section, and a second top side formed by the flange that is the same height level with the first top side and increases an area of the top side of the neck,   wherein the neck tubular section has a uniform thickness at an area immediately below the flange and an area where the engagement section is formed,   wherein a thickness of the flange is smaller than that of the neck tubular section, and   wherein the neck have been crystallized.   
     
     
         12 . The wide-neck container as defined in  claim 11 , wherein
 the flange includes an opposite side that is opposite to the second top side, and the second top side has a higher resin density than that of the opposite side.   
     
     
         13 . The wide-neck container as defined in  claim 11 , wherein
 the engagement section includes N (N is an integer equal to or larger than 2) threads, and the N threads are respectively provided in N segmented areas into which the neck tubular section is divided in a circumferential direction, and are respectively formed in the N segmented areas within a range of less than 360°/N.   
     
     
         14 . The wide-neck container as defined in  claim 13 , wherein
 each of the N threads extends from a start point that is positioned at a first height in an axial direction of the neck tubular section to an end point that is positioned at a second height in the axial direction of the neck tubular section so that each of the N threads slopes upward toward the top side of the neck.   
     
     
         15 . A wide-neck container that is made of a synthetic resin comprising:
 a neck;   a body; and   a bottom,   the wide-neck container being configured so that a top side of the neck is sealed by a cap that is fitted to the neck,   wherein the neck includes:   a neck tubular section;   an engagement section that is formed to protrude outward from the neck tubular section, and engages the cap; and   a ring-shaped recess that is formed in the neck tubular section at a height position closer to the body than the engagement section.   
     
     
         16 . The wide-neck container as defined in  claim 15 , wherein
 the engagement section includes N (N is an integer equal to or larger than 2) threads, and the N threads are respectively provided in N segmented areas into which the neck tubular section is divided in a circumferential direction, and are respectively formed in the N segmented areas within a range of less than 360°/N.   
     
     
         17 . The wide-neck container as defined in  claim 16 , wherein
 each of the N threads extends from a start point that is positioned at a first height in an axial direction of the neck tubular section to an end point that is positioned at a second height in the axial direction of the neck tubular section so that each of the N threads slopes upward toward the top side of the neck.