To certainly form a fold at a flap base part without forming a damage to a horizontal seal part and twisting a packaging material when the fold is formed at the flap base part by forming a folding habit at the leading end part of a flap.
Both end surfaces of a container 1 on the way of molding wherein the horizontal seal parts 3 are integrally provided to both end surfaces of a body part 2 are pressed to protrude both sides in the longitudinal direction of the horizontal seal parts 3 to form a pair of flaps of which the cross-sectional areas increase from the leading end part X of the body part 2 to the body part 2 and the body part 2 is molded into a predetermined outer shape. When the flap 4 of at least one end surface (top surface) 2a of at least one of the flaps of both end surfaces is folded to the side surface 2b of the body part 2 to be pressed and bonded thereto, the flap 4 is previously bent on the side of the leading end part X by a first fold forming member 8 to form the folding habit and a second fold forming member 9 for forming a fold at a flap base part 4a is provided subsequently.
Yasuo Miyoshi
Iwa Saki Kokuni
Akira Kurihara
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
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