Method for insert-molding film material

1. A film material insert molding method for forming a transparent resin layer on a front surface of a film material having a design portion and a substrate resin layer on a back surface of the film material, the method comprising:

an intermediate part forming step of forming a first intermediate part having an edge extending radially outward, the edge being disposed at the inside of an outer peripheral end of a final shape of the film material;

a transparent resin layer forming step of forming a second intermediate part including a transparent resin layer, by injection molding, on a front surface of the first intermediate part, with the edge of the first intermediate part being fixed to a transparent resin layer forming unit; and

a substrate resin layer forming step of forming an insert-molded article including a substrate resin layer, by injection molding, the substrate resin layer covering a back surface of the second intermediate part and a surface of a radially outer end of the edge, so that an end of the film material is prevented from being exposed from an external peripheral side surface of the insert-molded article as a final product.

2. The film material insert molding method of claim 1 , wherein

the intermediate part forming step includes forming one or more recessed portions that are radially inwardly hollow, in the edge, and

the transparent resin layer forming step includes positioning the first intermediate part using the one or more recessed portions.

3. The film material insert molding method of claim 2 , wherein

the transparent resin layer forming step includes forming a reception surface portion that allows a locating pin to position the first intermediate part and is radially inwardly hollow and located at a position of the transparent resin layer corresponding to the locating pin, and

the substrate resin layer forming step including forming the substrate resin layer such that the substrate resin layer covers the reception surface portion.

4. The film material insert molding method of claim 3 , wherein

the intermediate part forming step includes forming a plurality of radially extending cuts in the edge.

5. The film material insert molding method of claim 4 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

6. The film material insert molding method of claim 3 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

7. The film material insert molding method of claim 2 , wherein

the intermediate part forming step includes forming a plurality of radially extending cuts in the edge.

8. The film material insert molding method of claim 7 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

9. The film material insert molding method of claim 2 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

10. The film material insert molding method of claim 1 , wherein

the transparent resin layer forming step includes forming a reception surface portion that allows a locating pin to position the first intermediate part and is radially inwardly hollow and located at a position of the transparent resin layer corresponding to the locating pin, and

the substrate resin layer forming step including forming the substrate resin layer such that the substrate resin layer covers the reception surface portion.

11. The film material insert molding method of claim 10 , wherein

the intermediate part forming step includes forming a plurality of radially extending cuts in the edge.

12. The film material insert molding method of claim 11 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

13. The film material insert molding method of claim 10 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

14. The film material insert molding method of claim 1 , wherein

the intermediate part forming step includes forming a plurality of radially extending cuts in the edge.

15. The film material insert molding method of claim 14 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.

16. The film material insert molding method of claim 1 , wherein

the intermediate part forming step including forming a protruding and recessed pattern in the design portion, and

the substrate resin layer forming step includes forming the substrate resin layer such that the insert-molded article has a uniform thickness.