Abstract: A method for producing a multiple preform, including a primary injection for injection molding a preform main body using a primary mold, and a secondary injection for injection molding, using a secondary mold, a covering layer that covers the preform main body such that the terminal end side of the covering layer covers the lower surface of the neck ring and reaches the peripheral edge of the neck ring. A projection strip portion is formed when the preform main body is inserted into the secondary mold to be clamped, that projects in a gap in which the covering layer is molded to be in contact with or adjacent to a lower surface of the neck ring, and that extends with a given length along an axis direction, is formed on an inner peripheral surface of the secondary molding mold, thereby forming an easy tear portion in the covering layer.

Abstract: Provided are a preform for manufacturing a synthetic resin container, in which a decorative layer (60) having three-dimensional design different from the conventional one is formed on the surface of a container main body (10a), and a synthetic resin container. In a preform (1) including a preform main body (1a) of a bottomed cylindrical shape that is opened to have a mouth portion (2) on one end side thereof, and a covering layer (6) configured to cover the preform main body (1a) except for a part thereof on a mouth portion (2) side, and a container (10) obtained by subjecting the preform to blow molding, a distal end side of the covering layer (6) (decorative layer (60)) is formed so as to reach a peripheral end edge of a neck ring (22) while covering a lower surface of the neck ring (22) that is provided on a lower end side of the mouth portion (2) and protrudes annularly along a circumferential direction.

Abstract: A stretch-blow-formed polyester container having an average thickness of not more than 280 ?m in the body portion thereof, and effectively suppressing the deformation that is caused when the container is filled with a content of a high temperature, wherein in the measurement of dynamic viscoelastic properties in an axial direction at a central portion of said body portion, a tan ? peak value and a tan ? peak temperature at the peak value satisfy either; (i) the tan ? peak value is in a range of 0.23 to 0.29, and the tan ? peak temperature at the peak value is in a range of 111 to 118° C.?; or (ii) the tan ? peak value is in a range of less than 0.25, and the tan ? peak temperature at the peak value is in a range of not lower than 119° C.

Abstract: A synthetic resin container, including a mouth portion, a shoulder portion, a body portion and a bottom portion. The body portion is formed into an angular cylindrical shape and has one or more concave groove portions formed along a circumferential direction such that: a cross section shape of a site in which the concave groove portion is formed is similar to a cross section shape of a site formed into the body portion, and when the cross section shape of the site in which the concave groove portion is formed and the cross section shape of the site formed into the angular cylindrical shape of the body portion are superimposed, respective apexes of the cross section shape of the site in which the concave groove portion is formed internally contact respective sides of the cross section shape of the site formed into the angular cylindrical shape of the body portion.

Abstract: A stretch-blow-formed polyester container having an average thickness of not more than 280 ?m in the body portion thereof, and effectively suppressing the deformation that is caused when the container is filled with a content of a high temperature, wherein in the measurement of dynamic viscoelastic properties in an axial direction at a central portion of said body portion, a tan ? peak value and a tan ? peak temperature at the peak value satisfy either; (i) the tan ? peak value is in a range of 0.23 to 0.29, and the tan ? peak temperature at the peak value is in a range of 111 to 118° C.?; or (ii) the tan ? peak value is in a range of less than 0.25, and the tan ? peak temperature at the peak value is in a range of not lower than 119° C.

Abstract: A synthetic resin container, including a mouth portion, a shoulder portion, a body portion and a bottom portion. The body portion is formed into an angular cylindrical shape and has one or more concave groove portions formed along a circumferential direction such that: a cross section shape of a site in which the concave groove portion is formed is similar to a cross section shape of a site formed into the body portion, and when the cross section shape of the site in which the concave groove portion is formed and the cross section shape of the site formed into the angular cylindrical shape of the body portion are superimposed, respective apexes of the cross section shape of the site in which the concave groove portion is formed internally contact respective sides of the cross section shape of the site formed into the angular cylindrical shape of the body portion.