Method for manufacturing a waterproof felt duct and a waterproof felt duct

A method for manufacturing a waterproof felt duct, the method comprising:

• (a) forming a plurality of laminated bodies, each laminated body formed by laminating a waterproof film on a side of a first nonwoven fabric and laminating a second nonwoven fabric on a side of the waterproof film opposite to the first nonwoven fabric;
• (b) forming a waterproof felt base material by arranging and thermally adhering the laminated bodies together;
• (c) cutting the waterproof felt base material into a target shape;
• (d) forming a molded duct by surrounding the waterproof felt base material cut into the target shape around an external surface of a molding jig;
• (e) heat-treating the molded duct;
• (f) cooling the heat-treated duct;
• and
• (g) ejecting the cooled duct from the molding jig,
• wherein, in step (a), each laminated body is formed such that with respect to a length from a first end portion to a second end portion of the laminated body taken in a longitudinal direction of the laminated body, a length of the first nonwoven fabric is shorter than a length of the waterproof film and a length of the second nonwoven fabric is longer than the length of the waterproof film, and
• wherein, in step (b), the waterproof felt base material is formed by continuously arranging and adhering the laminated bodies such that a second nonwoven fabric of a second laminated body is accommodated at one end portion of a first nonwoven fabric of a first laminated body and on a lower surface of a waterproof film of the first laminated body.