Processability of a paint film is improved and a water-soluble paint in which coloring during heating to a high temperature is minimized and which has excellent productivity and a coated can having a paint film of such a water-soluble paint are provided. A water-soluble paint including a polymer emulsion (C) and a phenolic resin (D) is provided; wherein the polymer emulsion (C) includes a shell part containing an acrylic polymer (A) having a carboxyl group and a core part containing an acrylic polymer (B) having an amide group, wherein the phenolic resin (D) includes a bifunctional phenolic resin (D2) based on a bifunctional phenol and a trifunctional phenolic resin (D3) based on a trifunctional phenol, and a mass ratio ((D2)/(D3)) between the bifunctional phenolic resin (D2) and the trifunctional phenolic resin (D3) is 95/5 to 40/60.

To provide a composite preform that can ensure that worsening of the appearance of a surface of a plastic member caused by near-infrared heating prior to blow molding is effectively prevented and that an inner preform is efficiently heated. The composite preform of the present invention includes a preform and a heat-contractive plastic member, the preform including a mouth part; a trunk part linked to the mouth part; and a bottom part linked to the trunk part, and the heat-contractive plastic member being disposed so as to surround the outside of the preform and including at least a colored layer that contains a resin material and a colorant, wherein the heat-contractive plastic member has a near-infrared transmittance of 50% or higher.

To provide a composite preform that can ensure that worsening of the appearance of a surface of a plastic member caused by near-infrared heating prior to blow molding is effectively prevented and that an inner preform is efficiently heated. The composite preform of the present invention includes a preform and a heat-contractive plastic member, the preform including a mouth part; a trunk part linked to the mouth part; and a bottom part linked to the trunk part, and the heat-contractive plastic member being disposed so as to surround the outside of the preform and including at least a colored layer that contains a resin material and a colorant, wherein the heat-contractive plastic member has a near-infrared transmittance of 50% or higher.

A paper container package is provided, including: a paper layer; two plastic layers disposed on two sides of the paper layer; wherein the two plastic layers and the paper layer define at least one window which is light-penetrable in a thickness direction of the paper layer. A method for manufacturing a paper container package is provided, including steps of: preparing a paper material; partially hollowing out a part of the paper material; disposing a plastic coating on an inner side of the paper material; disposing a plastic layer on an outer side of the paper material, to form a package material; cutting the package material to form at least one paper container package; wherein the part of the paper material which is partially hollowed out, the plastic layer and the plastic coating at least partially overlap in a thickness direction of the package material.

A paper container package is provided, including: a paper layer; two plastic layers disposed on two sides of the paper layer; wherein the two plastic layers and the paper layer define at least one window which is light-penetrable in a thickness direction of the paper layer. A method for manufacturing a paper container package is provided, including steps of: preparing a paper material; partially hollowing out a part of the paper material; disposing a plastic coating on an inner side of the paper material; disposing a plastic layer on an outer side of the paper material, to form a package material; cutting the package material to form at least one paper container package; wherein the part of the paper material which is partially hollowed out, the plastic layer and the plastic coating at least partially overlap in a thickness direction of the package material.

A delamination container includes a bottle-shaped outer layer body including a mouth, a barrel and a bottom and an inner layer body releasably laminated on an inner surface of the outer layer body, the mouth being provided with an ambient air introduction hole passing through the outer layer body, in which a lower portion of the mouth is provided with a neck ring which has a notch circumferentially outside of at least a portion immediately below the ambient air introduction hole; and the notch is provided within a range of 60° on both sides of a radial reference line passing through an axial center of the ambient air introduction hole and radially extending, in a planar view of the container.

A delamination container includes a bottle-shaped outer layer body including a mouth, a barrel and a bottom and an inner layer body releasably laminated on an inner surface of the outer layer body, the mouth being provided with an ambient air introduction hole passing through the outer layer body, in which a lower portion of the mouth is provided with a neck ring which has a notch circumferentially outside of at least a portion immediately below the ambient air introduction hole; and the notch is provided within a range of 60° on both sides of a radial reference line passing through an axial center of the ambient air introduction hole and radially extending, in a planar view of the container.

A method for manufacturing a paperboard bottle and spiral-wound paperboard bottle. The bottle has a tubular body portion, a shoulder and neck portion having a circular cross-section narrowing from the body portion to a circular mouth. The paperboard bottle is a liquid packaging board having thermoplastic polymer coating on both sides. The method includes cutting a planar elongated blank from a packaging board sheet. Protecting exposed cut raw edge of the first longitudinal edge against absorption of liquid. Securing the first end of the blank to a rotatable mandrel having a rotation axis (x) and an outer shape corresponding to the shape of the bottle. Rotating the mandrel to wind the blank spirally onto the mandrel, so that the longitudinal edges overlap applying heat-sealing energy and pressure, onto the overlapping longitudinal edges to form a bottle with hermetically sealed spiral seam and removing the mandrel from inside the bottle.

A method for manufacturing a paperboard bottle and spiral-wound paperboard bottle. The bottle has a tubular body portion, a shoulder and neck portion having a circular cross-section narrowing from the body portion to a circular mouth. The paperboard bottle is a liquid packaging board having thermoplastic polymer coating on both sides. The method includes cutting a planar elongated blank from a packaging board sheet. Protecting exposed cut raw edge of the first longitudinal edge against absorption of liquid. Securing the first end of the blank to a rotatable mandrel having a rotation axis (x) and an outer shape corresponding to the shape of the bottle. Rotating the mandrel to wind the blank spirally onto the mandrel, so that the longitudinal edges overlap applying heat-sealing energy and pressure, onto the overlapping longitudinal edges to form a bottle with hermetically sealed spiral seam and removing the mandrel from inside the bottle.

A coating composition comprising a high molecular weight polyester, a trimellitic anhydride-polyol adduct and a curing agent is disclosed. The compositions are useful in coating food and beverage containers, particularly 2-piece cans formed by drawing and redrawing (DRD).