A preform assembly includes: an outer preform that includes an outer mouth portion and a stretch portion connected to the outer mouth portion and in which a recess extending in a vertical direction is provided on an inner surface of the stretch portion; and an inner preform that includes an inner mouth portion and a stretch portion connected to the inner mouth portion, wherein an outside air introduction port communicating with a part between the outer preform and the inner preform is provided in a mouth portion composed of the outer mouth portion and the inner mouth portion located on an inner side of the outer mouth portion.

A container may have a base, a sidewall connected to the base, a bell connected to the sidewall, and a finish connected to the bell. The base may have strap ribs to resist deformation of the base. The sidewall may have recessed columns to resist bending, leaning, crumbling, and/or stretching. The strap ribs and recessed columns may vertically line up along a central axis of the container to communicate forces on the container vertically along the container to continuously resist.

The principles of the present invention further provide both a shaped metal container and its preforms that exhibit a rounded grain structure characteristic created by an annealing process and a method for making a shaped metal container. The process of making said metal container results in a quicker process time and uses less metals (at least 10% metal weight savings), thus allowing for a decrease in the costs of making such shaped metal containers. A shaped metal container may include work hardened rolled sheet-metal defining a sidewall, an opening, and a base, where at least one section along the sidewall has grains with an average aspect ratio less than about 4 to 1.

A container may comprise a tubular body having a longitudinal axis and a rounded sidewall; a base portion; a rim portion; a vertical portion defined, in part, by the rounded sidewall, aligned along the longitudinal axis, and extending between the base portion and the rim portion; a plurality of grooves defined within the vertical portion, each of the grooves comprising a width defining opposing sides of each of the plurality of grooves, wherein: each of the plurality of grooves is aligned parallel with the longitudinal axis; the valley of each of the plurality of grooves is radially inset a distance from the vertical portion perimeter; and opposing sides of adjacently positioned ones of the plurality of grooves define a peak that is radially aligned with the vertical portion perimeter. The container may also comprise a set of base transition grooves extending between the base portion and the vertical portion and aligned parallel with the longitudinal axis.

A container may comprise a tubular body having a longitudinal axis and a rounded sidewall; a base portion; a rim portion; a vertical portion defined, in part, by the rounded sidewall, aligned along the longitudinal axis, and extending between the base portion and the rim portion; a plurality of grooves defined within the vertical portion, each of the grooves comprising a width defining opposing sides of each of the plurality of grooves, wherein: each of the plurality of grooves is aligned parallel with the longitudinal axis; the valley of each of the plurality of grooves is radially inset a distance from the vertical portion perimeter; and opposing sides of adjacently positioned ones of the plurality of grooves define a peak that is radially aligned with the vertical portion perimeter. The container may also comprise a set of base transition grooves extending between the base portion and the vertical portion and aligned parallel with the longitudinal axis.

A synthetic resin delamination container formed by blow molding a preform assembly having an outer preform and an inner preform, at least either one of an inner surface of the outer preform and an outer surface of the inner preform being applied with a release agent. The delamination container has: an outer layer body including an outer mouth portion and a bottomed tubular body portion being continuous with the outer mouth portion; an inner layer body including an inner mouth portion and a volume-reducible and deformable storage portion peelably laminated on an inner surface of the body portion through a release agent layer formed by the release agent; and an outside air introduction port configured to introduce outside air between the outer layer body and the inner layer body, in which an applying amount per unit area of the release agent layer is 10 to 850 mg/m.sup.2.

A container may have a base, a sidewall connected to the base, a bell connected to the sidewall, and a finish connected to the bell. The base may have strap ribs to resist deformation of the base. The sidewall may have recessed columns to resist bending, leaning, crumbling, and/or stretching. The strap ribs and recessed columns may vertically line up along a central axis of the container to communicate forces on the container vertically along the container to continuously resist.

A synthetic resin container that effectively absorbs reduced pressure generated inside the container due to hot filling to maintain the appearance and shape. A synthetic resin container includes a mouth as a dispensing spout for a content medium, a trunk, extending contiguous to the mouth via a shoulder, and a bottom, closing a lower end of the trunk. The trunk is provided with reduced pressure absorbing panels, which are formed as ribs extending in the vertical direction while twisting in the circumferential direction about a central axis of the trunk and which are arranged side by side in the circumferential direction of the trunk. Twist angle of a lower end with respect to an upper end of each reduced pressure absorbing panel about the central axis is 50 degrees or more.

A synthetic resin multilayer bottle includes an outer shell bottle, which can restore an original shape thereof in response to deformation attributable to pressing, an inner container body which deforms when pressed, and an air channel through which outside air is introduced between the outer shell bottle and the inner container body. The synthetic resin multilayer bottle has oxygen permeability such that, after the inner container body is fully filled with distilled water from which dissolved oxygen has been removed, an inner opening part is sealed, and the distilled water is allowed to stand for 60 days at a temperature of 20 C. while keeping the air channel between the outer shell bottle and the inner container body open, the amount of dissolved oxygen in the distilled water is 3 ppm or less. Such bottle prevents a liquid seasoning containing soy sauce from deteriorating due to oxygen in outside air.