Bottle-shaped can with cap and manufacturing apparatus thereof

A manufacturing apparatus of a bottle-shaped can with a cap, comprising:

• a neck portion on which a thread is formed, and on which the cap is mounted;
• and
• a curled portion formed on an upper end portion of the neck portion, to which a sealing member affixed to an inner surface of the cap is contacted tightly to seal the neck portion,
• wherein the curled portion has a top section including a leading end section as an upper end of the neck portion, a diametrically-largest section formed beneath the leading end section in which an outer diameter is largest, a diametrically-shrunk section extending downwardly from the diametrically-largest section in which an outer diameter is reduced gradually, and an outer circumferential wall section extending downwardly from the diametrically-shrunk section,
• wherein:
• the manufacturing apparatus comprises a forming tool that pushes a cylindrical folded portion bent outwardly from the neck portion toward an outer circumferential surface of the neck portion to form the curled portion,
• the forming tool includes an inner tool that is inserted into the neck portion to maintain a shape of the neck portion from inside, and an outer tool that pushes the folded portion toward the neck portion from radially outer side,
• the inner tool includes a shaft portion which is inserted into the neck portion, and an annular flat portion to which a leading end of the folded portion formed on the neck portion is contacted,
• the outer tool includes a projection that is isolated from the annular flat portion at a distance wider than a length between the leading end section and the diametrically-largest section in a direction along a center axis of the neck portion, and that pushes the folded portion toward the neck portion from radially outer side, and
• the neck portion engaged with the inner tool is rotated along the outer tool to form the curled portion.

A bottle-shaped can with a cap, comprising:

• a neck portion on which a thread is formed, and on which the cap is mounted;
• and
• a curled portion formed on an upper end portion of the neck portion, to which a sealing member affixed to an inner surface of the cap is contacted tightly to seal the neck portion;
• wherein the curled portion includes a smooth top section formed by folding an end portion of a metallic seat forming the neck portion radially outwardly,
• the top section includes a leading end section as an upper end of the neck portion, a diametrically-largest section formed beneath the leading end section in which an outer diameter is largest, a diametrically-shrunk section extending downwardly from the diametrically-largest section in which an outer diameter is reduced gradually, and an outer circumferential wall section extending downwardly from the diametrically-shrunk section,
• the leading end section, the diametrically-largest section, and the diametrically-shrunk section form a smooth curved surface,
• a curvature of the outer circumferential wall section in a cross-section along a plane passing through a center axis of the neck portion is zero or negative value, given that a curvature of the diametrically-shrunk section is positive value,
• a flexion section is formed between the diametrically-shrunk section and the outer circumferential wall section,
• the outer diameter of the outer circumferential wall section in which the curvature is zero or negative value is larger than an outer diameter of the flexion section,
• a lower end arcuate section is formed beneath the outer circumferential wall section, and a curvature of the lower end arcuate section is positive value so that the cross-section of the lower end arcuate section along the plane passing through the center axis of the neck portion expands radially outwardly,
• the lower sealing end as the lowest portion to which the sealing member is contacted is situated at a predetermined site of a surface of the lower end arcuate section, and
• wherein an outer diameter of the lower sealing end is equal to or larger than the outer diameter of the diametrically-largest section.