Production manner of the foaming resin sheet which had sudden provision on the surface and dies die null for

摘要

PURPOSE:To facilitate the production of a die by a constitution wherein the die is produced by continuously connecting a flat or cylindrical resin passage, which has the width gradually increasing to the running direction of resin and forms on the resin inlet side of the die, a plurality of bar-like passages separated parallel to one another in connection with the flat resin passage and a flat or cylindrical outlet side passage connecting to the bar-like passages. CONSTITUTION:The resin passage 2 of a die 1 is constituted by connecting an inlet side resin passage A, intermediate resin passages B and an outlet side resin passage C to one another. For example, in the case of a flat resin passage A is formed by a flat passage 11, the width of which gradually increase to the running direction of resin. The intermediate passage B is formed in the shape of a plurality of bar-like passages 12 over the range of the width of the passage A. Further, the outlet side passage C is formed in the shape of a flat passage having the thickness thinner than the thickness of the bar-like passage B by turning the bar-like passages B. By using the die 1 having the above-mentioned constitution, shown formed resin sheet is produced out of polystyrene, for example.