Method and device for manufacturing seal film, method of manufacturing inner seal attachment container, inner seal member, and method of sealing cap attachment container using the same

A method of manufacturing a seal film comprising:

• interfolding a first base formed of an elongated film having a sealant layer formed on one surface thereof along a folding line extending in a flow direction of the first base so that the opposite surfaces of the sealant layer face each other;
• overlapping one portion of two portions divided by the folding line of the first base with a second base formed of an elongated film having a sealant layer formed on one surface thereof so that the sealant layers of both bases face each other;
• sealing the one portion of the first base to the second base;
• overlapping portions of the first and second bases which are not sealed to each other with a third base formed of an elongated film having a sealant layer formed on at least one surface thereof so that the sealant layers thereof face each other;
• sealing the other portion except for the one portion of the first base to the third base;
• sealing a portion of the second base which is not sealed to the first base to the third base;
• punching a laminated structure, formed by sealing the first to third bases to each other, into a predetermined shape so that the folding line portion is included in a punching area;
• and
• manufacturing a handle portion formed by the sealed portions of the first and second bases.

A method of manufacturing an inner seal attachment container comprising:

• interfolding a first base formed of an elongated film having a sealant layer formed on one surface thereof along a folding line extending in a flow direction of the first base so that the opposite surfaces of the sealant layer face each other;
• overlapping one portion of two portions divided by the folding line of the first base with a second base formed of an elongated film having a sealant layer formed on one surface thereof so that the sealant layers of both bases face each other;
• sealing the one portion of the first base to the second base;
• punching a laminated structure, formed by sealing the first and second bases to each other, into a shape of a seal film so that the folding line portion is included in a punching area;
• manufacturing a handle portion formed by the sealed portions of the first and second bases;
• placing a third base formed in the same shape as the punching shape of the seal film and having sealant layers formed on both surfaces thereof and a metal layer formed therein directly on a peripheral edge of a container opening or via a fourth base having both sealable surfaces interposed therebetween;
• placing unsealed portions of the first and second bases of the seal film having the handle portion on the third base;
• mounting a cap to the container opening;
• and
• sealing a gap from the seal film to the peripheral edge of the container opening through a high-frequency induction heating process in the state where the seal film comes into press contact with the peripheral edge of the container opening in the inside of the cap.

A method of manufacturing an inner seal attachment container comprising:

• interfolding a first base formed of an elongated film having a sealant layer formed on one surface thereof along a folding line extending in a flow direction of the first base so that the opposite surfaces of the sealant layer face each other;
• overlapping one portion of two portions divided by the folding line of the first base with a second base formed of an elongated film having a sealant layer formed on one surface thereof so that the sealant layers of both bases face each other;
• sealing the one portion of the first base to the second base;
• overlapping portions of the first and second bases which are not sealed to each other with a third base formed of an elongated film having sealant layers formed on both surfaces thereof and a metal layer formed therein so that the sealant layers thereof face each other;
• sealing the other portion except for the one portion of the first base to the third base;
• sealing a portion of the second base which is not sealed to the first base to the third base;
• punching a laminated structure, formed by sealing the first to third bases to each other, into a shape of a seal film so that the folding line portion is included in a punching area;
• manufacturing a handle portion formed by the sealed portions of the first and second bases;
• placing the seal film having the handle portion directly on a peripheral edge of a container opening or via a fourth base having both sealable surfaces interposed therebetween;
• mounting a cap to the container opening;
• and
• sealing a gap from the seal film to the peripheral edge of the container opening through a high-frequency induction heating process in the state where the seal film comes into press contact with the peripheral edge of the container opening in the inside of the cap.

A method of manufacturing a seal film comprising:

• preparing a first base formed of an elongated film having a sealant layer formed on one surface thereof and a second base formed of an elongated film having a sealant layer formed on at least one surface thereof;
• interfolding a part of an end portion of the first base along a folding line extending in a flow direction of the first base so that the surfaces of the sealant layers face each other;
• overlapping a side of the first base having a folding back portion with the sealant layer of the second base so as to face each other;
• sealing the first and second bases to each other;
• punching a laminated structure formed by the sealing into a predetermined shape so that the folding back portion of the first base is included in a punching area;
• and
• manufacturing a handle portion formed by the sealed portion of the first base.

A method of manufacturing a seal film comprising:

• preparing a first base formed of an elongated film having a sealant layer formed on one surface thereof, a second base formed of an elongated film having a sealant layer formed on at least one surface thereof, and a third base formed of an elongated film having the same configuration as that of the first base and having a width narrower than those of the first and second bases;
• allowing the sealant layer of the first base to face the sealant layer of the second base;
• inserting the third base between the first and second bases;
• sealing overlapping portions of the first to third bases to an area having overlapping portions of the first and second bases;
• punching a laminated structure formed by the sealing into a predetermined shape so that an one-side end portion of the third base is included in a punching area;
• and
• manufacturing a handle portion formed by the first base on the side of the third base or manufacturing a handle portion formed by the sealed portions of the first and third bases.

A method of manufacturing a seal film:

• allowing a first base to come into contact with an interfolding plate at a position deviated from an interfolding assisting plate in the state where the first base formed of an elongated film having a sealant layer formed on one surface thereof follows the interfolding assisting plate;
• interfolding the first base so as to have an S-shaped, Z-shaped, or Q-shaped interfolding shape in a sectional view in a flow direction of the first base;
• overlapping a second base formed of an elongated film having a sealant layer formed on at least one surface thereof with the first base having the interfolding shape so that the sealant layers of both bases face each other;
• sealing the first base to the second base;
• punching a laminated structure, formed by sealing the first and second bases to each other, into a predetermined shape so that a folding line portion of the first base contacting with the second base is included in a punching area;
• and
• manufacturing a handle portion formed by the sealed portion of the first base.

A method of manufacturing a seal film comprising:

• allowing an interfolding plate to come into contact with a first base in the state where the first base formed of an elongated film having a sealant layer formed on one surface thereof follows an interfolding assisting plate;
• interfolding the first base so as to have an outward mountain-folding shape in the width direction in a sectional view in a flow direction of the first base;
• sealing a folding back portion formed in the mountain-folding shape so as to form a sealed portion of the first base;
• allowing an unsealed portion of an end portion of the first base to come into contact with a folding back plate;
• folding back the sealed portion of the first base so as to have an outward valley-folding shape in the width direction in the sectional view in the flow direction of the first base;
• allowing the first base to have an S-shaped, Z-shaped, or Q-shaped interfolding shape in the sectional view in the flow direction of the first base;
• overlapping a second base formed of an elongated film having a sealant layer formed on at least one surface thereof with the first base having the interfolding shape so that the sealant layers of both bases face each other;
• sealing the first base to the second base;
• punching a laminated structure, formed by sealing the first and second bases to each other, into a predetermined shape so that a folding line portion of the first base contacting with the second base is included in a punching area;
• and
• manufacturing a handle portion formed by the sealed portion of the first base.

A device for manufacturing a seal film comprising:

• an interfolding assisting plate which supports a first base formed of an elongated film having a sealant layer formed on one surface thereof;
• an interfolding plate which comes into contact with the first base at a position deviated from the interfolding assisting plate in the state where the first base follows the interfolding assisting plate so that the first base is interfolded to have an S-shaped, Z-shaped, or Q-shaped interfolding shape in a sectional view in a flow direction of the first base;
• sealing means which overlaps a second base formed of an elongated film having a sealant layer formed on at least one surface thereof with the first base having the interfolding shape so that the sealant layers of both bases face each other and seals the first base to the second base;
• and
• punching means which punches a laminated structure, formed by sealing the first and second bases to each other, into a predetermined shape so that a folding line portion of the first base contacting with the second base is included in a punching area and forms a handle portion formed by the sealed portion of the first base.

A device for manufacturing a seal film comprising:

• an interfolding assisting plate which comes into contact with a first base formed of an elongated film having a sealant layer formed on one surface thereof;
• an interfolding plate which comes into contact with the first base in the state where the first base follows the interfolding assisting plate and interfolds the first base so as to have an outward mountain-folding shape in the width direction in a sectional view in a flow direction of the first base;
• first sealing means which seals a folding back portion having the mountain-folding shape and forms a sealed portion of the first base;
• a folding back plate which comes into contact with an unsealed portion of an end portion of the first base, folds back a sealed portion of the first base so as to have an outward valley-folding shape in the width direction in a sectional view in a flow direction of the first base, and then allows the first base so as to have an S-shaped, Z-shaped, or Q-shaped interfolding shape in the sectional view in the flow direction of the first base;
• second sealing means which overlaps a second base formed of an elongated film having a sealant layer formed on at least one surface thereof with the first base having the interfolding shape so that the sealant layers of both bases face each other and seals the first base to the second base;
• and
• punching means which punches a laminated structure, formed by sealing the first and second bases to each other, into a predetermined shape so that a folding line portion of the first base contacting with the second base is included in a punching area and forms a handle portion formed by the sealed portion of the first base.

An inner seal member comprising:

• a handle portion which is formed in a shape not protruding from a container opening,
• wherein the handle portion is formed by laminating a part of a first base on an one-side portion of a second base divided into two portions by a folding line,
• wherein compressive strength using a ring crush method prescribed in JIS P8126 of the second base is larger than that of the first base, and
• wherein a sealant layer of a base manufacturing the handle portion is exposed to a part of a front end of the handle portion.