초록 ▼

A biaxially-stretch-blow-molded container and a method of producing the same. Redraw ratio at the bottom portion is small in the secondary blow molding without employing a complex heating system but in which a secondary article obtained by subjecting a preform article to the primary blow molding is

A biaxially-stretch-blow-molded container and a method of producing the same. Redraw ratio at the bottom portion is small in the secondary blow molding without employing a complex heating system but in which a secondary article obtained by subjecting a preform article to the primary blow molding is preferentially shrunk at its bottom portion, and a tertiary article or a quaternally article before being subjected to the secondary blow molding is obtained having a bottom of a flat shape or in which the central portion is recessed inwardly of the container and the periphery thereof is flattened. The bottle obtained by this method has a thickness and crystallinity in the bottom portion which are nearly the same as those of the center of the barrel and are highly oriented. The heat-resistant bottle exhibits excellent strength in the bottom portion and symmetrical panel-sinking stability in the vacuum pressure.

대표청구항 ▼

A method of producing a biaxially-stretch-blow-molded container by blow-molding a cylindrical preform article with bottom that is heated at a drawing temperature, comprising: a step for subjecting the preform article to a primary blow molding to obtain a biaxially drawn secondary article having a do

A method of producing a biaxially-stretch-blow-molded container by blow-molding a cylindrical preform article with bottom that is heated at a drawing temperature, comprising: a step for subjecting the preform article to a primary blow molding to obtain a biaxially drawn secondary article having a domed bottom portion without substantially containing undrawn portions; a step for heating the domed bottom portion of the secondary article to preferentially shrink the bottom portion in order to obtain a tertiary article having a flat bottom portion; a step for heating the tertiary article inclusive of the bottom portion and a barrel portion thereof in order to obtain a quaternary article of which the barrel portion is chiefly shrunk; and a step for subjecting the heated quaternary article to a secondary blow molding.