Process for making a toothbrush, stack mold assembly and mold blocks for such mold assembly

摘要

An injection moulding process for making a toothbrush involving a stack mould assembly of at least three mould blocks ( 1, 2, 3, 4 ) arranged for use along a longitudinal stack axis (A-A), with two end mould blocks ( 3, 4 ), and an intermediate mould block ( 1, 2 ), with part mould cavities ( 11 A, 21, 31, 41, 51 ) in the blocks. Plastic toothbrush skeletons are made in a cavity ( 11 A, 21, 31 ) between the intermediate block ( 1, 2 ) and one end block ( 3 ), then elastomer parts are made in a cavity ( 41, 51 ) between the intermediate block ( 1, 2 ) and the other end block ( 4 ). Preferably the intermediate block ( 1 ) rotates so its part cavity ( 11 A) faces the other end block ( 4 ). Stack mould assemblies ( 1, 2, 3, 4 ) for this process are provided. The assembly ( 1, 2, 3, 4 ) provides a compact mould with high output.