Abstract: Provided are a multilayer film capable of suppressing generation of air bubbles in an adhesive layer and suppressing occurrence of winding misalignment when wound immediately after lamination, a method for producing the multilayer film, and a packaging container using the multilayer film. The multilayer film of the disclosure is a multilayer film including a plurality of resin films and one or more adhesive layers, and is characterized that at least one of the adhesive layers is formed of a solventless adhesive; and the solventless adhesive contains a main agent made of a polyester-based resin and a curing agent made of an aliphatic isocyanate, and a viscosity of the solventless adhesive at 80° C. is from 650 to 1600 mPa·s.

Abstract: To provide a method for producing a laminated film, a laminated film, and a packaging container, which are capable of reducing an environmental load and suppressing generation of air bubbles in an adhesive layer. In the method for producing a laminated film, a solventless adhesive has a viscosity at 50° C. of from 700 to 2000 mPa·s. The coating device further includes a coating unit, the coating unit including: a pair of rolls, a plurality of transfer rolls configured to sequentially transfer and supply the solventless adhesive, and an application roll disposed on the opposite side of a fine clearance from a doctor roll, the doctor roll being one of the plurality of transfer rolls and positioned at an end on a side where supply of the solventless adhesive starts. A peripheral speed of the doctor roll is from 1.0 to 10.0 m/min.

Abstract: A method for manufacturing a sealed battery 10 includes a step of bringing into contact a collector 18 and collector receiving part 25 having hemispherical protrusions 18a and 25a, respectively, with both sides of at least one of the plurality of positive electrode substrate exposed portions 14 and the plurality of negative electrode substrate exposed portions 15 so that the collector 18 and collector receiving part 25 oppose each other, where the displacement between central axes of the hemispherical protrusions 18a and 25a is not more than ½ of the diameter of the hemispherical protrusions 18a and 25a, and a step of resistance-welding between the collector 18 and collector receiving part 25 by applying current under a pressure. According to the method, the collector and collector receiving part can be reliably resistance-welded to the substrates.