Apparatus for forming a heat-resistant container

An apparatus for forming a heat-resistant container by thermally shrinking in a heating furnace a primary blow molded article formed by primary blow molding and then secondary blow molding,

• wherein said heating furnace includes a hot air source for blowing hot air at a given wind speed, whose temperature is such as to facilitate crystallization of the primary blow molded article, a first air blow guide member for locating a barrel portion of the primary blow molded article therein and extending longitudinally of the primary blow molded article, and an air supply port for supplying the hot air from said hot air source inwardly of said first air blow guide member from the side of one end thereof, whereby the primary blow molded article is thermally shrunk by being blown by the hot air at a given wind speed longitudinally along the primary blow molded article while exposing the entire circumferential surface of a barrel portion of the primary blow molded article to the hot air and then guiding the hot air through the first air blow guide member,
• wherein said air supply port supplies the hot air inwardly of said first air blow guide member from the side below a bottom of the primary blow molded article suspended and supported in an upright position inside said first air blow guide member, and
• wherein said heating furnace further includes an air discharge port for collecting the hot air to said hot air source, after touching the barrel of the primary blow molded article as passing upwardly inside said first air blow guide member when the hot air flows longitudinally inside the first air blow guide member, via the outside of the first air blow guide member from the side of the other end of said first air blow guide member.

An apparatus for forming a heat-resistant container by thermally shrinking in a heating furnace a primary blow molded article formed by primary blow molding and then secondary blow molding,

• wherein said heating furnace includes a hot air source for blowing hot air at a given wind speed, whose temperature is such as to facilitate crystallization of the primary blow molded article, a first air blow guide member for locating a barrel portion of the primary blow molded article therein and extending longitudinally of the primary blow molded article, and an air supply port for supplying the hot air from said hot air source inwardly of said first air blow guide member from the side of one end thereof, whereby the primary blow molded article is thermally shrunk by being blown by the hot air at a given wind speed longitudinally along the primary blow molded article while exposing the entire circumferential surface of a barrel portion of the primary blow molded article to the hot air and then guiding the hot air through the first air blow guide member,
• wherein said air supply port supplies the hot air inwardly of said first air blow guide member from the side above a shoulder of the primary blow molded article suspended and supported in an upright position inside said first air blow guide member, via outside said first air blow guide member, and
• wherein said heating furnace further includes an air discharge port for collecting the hot air to said hot air source, after touching the shoulder and barrel of the primary blow molded article as passing downwardly inside said first air blow guide member when the hot air flows longitudinally inside the first air blow guide member.

An apparatus for forming a heat-resistant container by thermally shrinking in a heating furnace a primary blow molded article formed by primary blow molding and then secondary blow molding,

• wherein said heating furnace includes a hot air source for blowing hot air at a given wind speed, whose temperature is such as to facilitate crystallization of the primary blow molded article, a first air blow guide member for locating a barrel portion of the primary blow molded article therein and extending longitudinally of the primary blow molded article, and an air supply port for supplying the hot air from said hot air source inwardly of said first air blow guide member from the side of one end thereof, whereby the primary blow molded article is thermally shrunk by being blown by the hot air at a given wind speed longitudinally along the primary blow molded article while exposing the entire circumferential surface of a barrel portion of the primary blow molded article to the hot air and then guiding the hot air through the first air blow guide member,
• wherein said heating furnace further includes a second air blow guide member in a hollow double-wall structure connected to said first air blow guide member, with an upper end of each wall airtightly closed and a lower end of the inner wall confronting the bottom of the primary blow molded article to mask the bottom, with a lower end of the outer wall connected to said air supply port, the inner wall opposite to the barrel of the primary blow molded article having an opening through which the hot air supply supplied into the gap between the inner and outer walls to be ejected obliquely upwardly.

An apparatus for forming a heat-resistant container by thermally shrinking in a heating furnace a primary blow molded article formed by primary blow molding and then secondary blow molding,

• wherein said heating furnace includes a hot air source for blowing hot air at a given wind speed, whose temperature is such as to facilitate crystallization of the primary blow molded article, a first air blow guide member for locating a barrel portion of the primary blow molded article therein and extending longitudinally of the primary blow molded article, and an air supply port for supplying the hot air from said hot air source inwardly of said first air blow guide member from the side of one end thereof, whereby the primary blow molded article is thermally shrunk by being blown by the hot air at a given wind speed longitudinally along the primary blow molded article while exposing the entire circumferential surface of a barrel portion of the primary blow molded article to the hot air and then guiding the hot air through the first air blow guide member,
• wherein said heating furnace includes reforming means for pressing the confronting sidewalls of each primary blow molded article inwardly to reform the outer diameter of the primary blow molded article in a direction parallel to parting surfaces of the mold halves to be smaller than the transverse width of the cavity of the mold halves.