Self-standing bag, production method thereof, and self-standing bag having content therein

A self-standing bag comprising:

• a barrel portion where a barrel member is formed in a flattened cylindrical shape and which has a front surface portion and a back surface portion;
• and
• a bottom portion where a bottom member with a flattened pouch shape opened at a lower end is attached in the barrel portion such that the lower ends of the bottom member match a lower end of the barrel portion,
• wherein side edge areas of the bottom member are folded back at edges of the barrel portion, and side edges of the bottom member are attached to an inner surface of the front surface portion or the back surface portion of the barrel portion,
• lower ends of the bottom member are adhered to the lower end of the barrel portion over the entire circumference of the barrel portion, and
• attaching the side edges of the bottom member to the inner surface of the barrel portion is performed by an adhesive member to adhere the side edges of the bottom member to the barrel portion so as to cover the side edges of the bottom member.

A production method of a self-standing bag comprising:

• (I) arranging a film-like bottom member which sets a folding line as an upper end and is folded in half or a film-like bottom member formed in a flattened pouch shape with lower ends opened on a film-like barrel member so that a lower end of the barrel member matches the lower ends of the bottom member;
• (II) arranging an adhesive member to adhere the barrel member and the bottom member so as to cover respective side edges of the bottom member arranged on the barrel member;
• (III) adhering the side edges of the bottom member and the barrel member, and the adhesive member to attach the side edges of the bottom member to the barrel member;
• (IV) forming a barrel portion by folding back side edge areas of the barrel member with side edge areas of the bottom member, and adhering the side edges of the barrel member such that a surface where the bottom member is adhered forms an inner surface and folding lines are formed in the center from both side edges of the bottom member;
• and
• (V) forming a bottom portion by adhering the lower ends of the bottom member and the lower end of the barrel portion over the entire circumference of the barrel portion.