PROCESS FOR PRODUCING A HOLLOW ITEM BY INJECTION- MOULDING AND OBJECT OBTAINED BY USING SAID PROCESS

摘要

A process of producing a hollow item by injection-moulding thermoplastic material, which has a rigid external shell and at least one soft internal portion, which uses a mould comprising a matrix, a first semi-mould including a first cavity and a second semi-mould including a second cavity counter-shaped to the matrix to reproduce a respective semi-shell of said rigid external shell. The process includes the phases of positioning at least one insert made of a soft material, constituting the soft internal portion, on the matrix; covering the insert with a connecting layer; hermetically sealing the first and second semi-moulds onto the matrix along the edges of the cavities; injecting into the space between the cavities and the connecting layer a thermoplastic material that forms the rigid external shell to create a permanent connection of the soft insert to the shell. The connecting layer substantially retains the characteristics of the soft insert.

主权项

1. Process of producing a hollow item by injection-moulding thermoplastics material, said item comprising a rigid external shell and at least one soft internal portion, said process including the use of a mould comprising a matrix, a first semi-mould comprising a first cavity and a second semi-mould comprising a second cavity counter-shaped to said matrix to reproduce a respective semi-shell of said rigid external shell, wherein it comprises the following phases:
a. positioning at least one insert made of a soft material on said matrix, said insert constituting said at least one soft internal portion of said hollow item; b. covering said at least one insert with a connecting layer; p1 c. hermetically sealing said first and second semi-moulds onto said matrix along the edges of said first and second cavity; d. injecting into the space existing between said first and second cavity and said connecting layer a thermoplastics material destined to form said rigid external shell in order to create a permanent connection of said at least one soft insert to said rigid external shell, said connecting layer substantially retaining the characteristics of said at least one soft insert unchanged.