| 摘要 |
PROBLEM TO BE SOLVED: To provide an insert injection-molded lid with extremely little deformation of a top board, good adhesiveness between the top board and the peripheral wall part, good moldability and no problem on food hygiene. SOLUTION: In a lid comprising a top board 110 consisting of a laminated material made of a paper layer as a base material and the peripheral wall part 120 made of a synthetic resin, the top board wherein a heat-adhesive resin layer 111 is formed on an adhesive part with the peripheral wall part or an undercoat layer and a heat-adhesive resin layer are downward successively formed is mounted in advance in a mold for injection molding and polystyrene is injected in the mold to mold the peripheral wall part and at the same time, the top board are hot welded to a top board bonding ring 12 provided above the peripheral wall part to mold them integrally. |
