Rotational moulding process and related mould for rotational moulding comprising a venting device

Abstract

Rotational moulding process for producing an article (300), the process comprising: —providing a mould (100) comprising: —a main body (99) which defines an inner cavity (30) having a conformation surface (31) counter-shaped to the article (300), and —a venting device (1) fixed to the main body (99) and comprising: —an inner chamber (2) in air communication with the inner cavity (30) through a first mouth (3) and with an outer environment (35) through at least one second mouth (4); —a shutter (5) movable between an open position, in which let free the first mouth (3) for putting the inner cavity (30) in air communication with the outer environment (35), and a close position, in which closes the first mouth (3) for preventing the air communication; —an actuator (6) for alternately moving the shutter (5) between the open position and the close position, the process further comprising: —inserting a fluid form polymeric material into the inner cavity (30); —closing the main body (99) and rotating the mould (100); —while keeping the mould (100) in rotation and with the shutter (5) in the close position, heating the main body (99) until reaching a first temperature; —while keeping the mould (100) in rotation, heating the main body (99) until reaching a second temperature higher than the first temperature; —cooling the main body (99) and extracting the article (300), and wherein, during the heating of the main body (99) until the reaching of the first temperature, the process further comprises subtracting heat from the shutter (5) for maintaining the shutter (5) at a respective temperature lower than the first temperature.

Dependencies are inferred from the claim text.