초록 ▼

A method for forming a pattern onto an article during injection molding thereof. A pattern-bearing film is heated and softened by a heating board. The softened pattern-bearing film is transferred to the cavity surface of a female mold. Thereafter, the female mold and a male mold are closed. Then, a

A method for forming a pattern onto an article during injection molding thereof. A pattern-bearing film is heated and softened by a heating board. The softened pattern-bearing film is transferred to the cavity surface of a female mold. Thereafter, the female mold and a male mold are closed. Then, a molten resin is injected into the cavity. When a pattern-bearing film is brought in contact with and heated by the heating board, marks or impressions of air blow holes on the surface of the heating board remain on the pattern-bearing film. To prevent the formation of these marks or impressions, a square-shaped holding frame is fixed on the surface of the heating board. The peripheral portion of the pattern-bearing film is held on the surface of the holding frame. Thus, while the pattern portion of the pattern-bearing film is spaced apart from the surface of the heating board, the film is heated. To keep the pattern-bearing film uniformly spaced from the surface of the heating board, air is supplied to the inside of the holding frame.

대표청구항 ▼

[ What is claimed is:] [1.] A method for forming a pattern onto an article during an injection molding thereof, comprising the steps of:providing a pattern-bearing film in the form of a supply roll of a strip;supplying the pattern-bearing film from said supply roll to move the film to a molding posi

[ What is claimed is:] [1.] A method for forming a pattern onto an article during an injection molding thereof, comprising the steps of:providing a pattern-bearing film in the form of a supply roll of a strip;supplying the pattern-bearing film from said supply roll to move the film to a molding position where a male mold and a female mold are opposed;moving a heating board to said molding position;holding only an outer peripheral portion of a part of said pattern-bearing film in said molding position in a set-apart but sealed relation to a heating surface of said heating board moved to said molding position with said heating surface spaced from the pattern-bearing film;thereafter cutting the pattern-bearing film at a position thereof displaced toward said supply roll from said part where said film is held to the heating surface to thereby isolate said part from the rest of the film extending from said supply roll to said part;after said step of cutting, heating and softening said part of the pattern-bearing film by the heating board while said set-apart but sealed relation is maintained;transferring said heated part of the pattern-bearing film onto an internal surface of said female mold to contact said pattern-bearing film with said internal surface;retracting said heating board from said molding position;clamping said male mold and said female mold while said heated pattern-bearing film is in contact with said internal surface; andinjecting a molten resin into a cavity defined by said male mold and said female mold to form a molded article and to adhere said pattern-bearing film to the surface of said article.