| 摘要 |
An apparatus for preparing a multi-cellular foamed board of thermoplastic resin which comprises an extruder (1), a die (3) and a moulding passage (6), the die (3) having at the forward end thereof an orifice which has a greater width than height, characterised in that the forward end (5) of the die (3) has a convex surface which protrudes most in the resin feed direction at the middle, in that the moulding passage (6) having a resin passageway therein has a concave surface on the inlet side thereof, corresponding to said convex surface so that the moulding passage is closely contacted with the convex surface of the die, and in that the resin passageway in the moulding passage increases in both thickness and width in the resin feed directions at a portion close to and extending along the concave surface. |
