Abstract: A spout member including a base portion which is fixed to a bag body, a cylindrical portion which protrudes upward from the base portion, and a sealing portion which seals a front end of the cylindrical portion through a breakable thin portion is disposed between two sheets of film forming the bag body. A sealing chamber accommodating the cylindrical portion and the sealing portion is opened by tearing the two sheets of film along an opening assisting line. An opening assisting plate protruding to at least one of a left side and a right side of the sealing portion is disposed above the opening assisting line. A sandwiching reinforcement seal portion for reinforcing the two sheets of film by sealing inner surfaces thereof is provided between the opening assisting plate and the opening assisting line.

Abstract: A laminate production method using a surface-modified film includes the step of laminating a first substrate and a second substrate on each other, where the first and second substrates have thermoplastic resin films or cellophane films and are different in type from each other. One of the first and second substrates has a surface with a heat-bonding-modified layer formed by surface modification using an atmospheric plasma treatment apparatus. The other of the first and second substrates has an air corona-treated surface. The first and second substrates are individually fed from respective rolls of film, which are obtained by respectively winding the first substrate and the second substrate. The surface having the heat-bonding-modified layer faces the air corona-treated surface, and the first and second substrates are thermocompression-bonded together using a heated roller without applying an adhesive or anchoring agent to perform a continuous lamination.

Abstract: A substrate which is either a first substrate or a second substrate consisting of a different kind of thermoplastic resin film or cellophane film, and which is drawn out from rolled films where the first substrate and the second substrate are rolled respectively. The substrate has a surface of the hot gluing reforming layer which was formed with the surface modification with an atmospheric pressure plasma processor, and the other substrate has a surface with which an air corona processor is possessed. And the substrate and the other base member are opposed, and are attached together with a heating roll with spreading neither an adhesive nor an anchor agent.

Abstract: It is aimed to provide a spout member and a packaging bag using the spout member which have excellent handling property and hygiene management performance at the time of supplying water or the like from the outside before and during use such as administration of water and medicine, in which a closure means for freely opening and closing an aperture formed by cutting off parts of peripheral portions of sealed film pieces is protected from a contained content at the time of storage or transportation and which have excellent protecting property even when an inner pressure acts in the packaging bag, excellent contamination preventing property until a spout is opened and excellent contamination preventing property and handling property after opening.

Abstract: A spout member including a base portion which is fixed to a bag body, a cylindrical portion which protrudes upward from the base portion, and a sealing portion which seals a front end of the cylindrical portion through a breakable thin portion is disposed between two sheets of film forming the bag body. A sealing chamber accommodating the cylindrical portion and the sealing portion is opened by tearing the two sheets of film along an opening assisting line. An opening assisting plate protruding to at least one of a left side and a right side of the sealing portion is disposed above the opening assisting line. A sandwiching reinforcement seal portion for reinforcing the two sheets of film by sealing inner surfaces thereof is provided between the opening assisting plate and the opening assisting line.