| 摘要 |
A mould for the rotational moulding of manufactured articles of plastic material includes two half-moulds, one of which is provided, on its surface, with an insert-holding device comprising a rod with a first end passing through the wall of the half-mould at a respective passage channel and axially movable for projecting inside the mould. The mould also comprises a first pneumatic circuit able to apply a predetermined pressure, positive or negative, inside the mould. At least one insert-holding device is operatively connected to a second pneumatic circuit able to apply a predetermined pressure, positive or negative, and is internally provided with a plurality of means to apply the predetermined pressure at the passage channel, so that at the insert-holding device the same predetermined pressure value which generates inside the mould by the first pneumatic circuit is applied. |
| 主权项 |
1. Mould (10) for the rotational moulding of manufactured articles of plastic material, the mould (10) comprising two half-moulds (12, 14) wherein at least one of said two half-moulds (12, 14) is provided, on its surface, with at least one insert-holding device (18) comprising a rod (20) provided with a first end (46) passing through the wall of the half-mould (12, 14) at a respective passage channel (24) and which is axially movable for projecting inside the mould (10), so that on said first end (46) an insert (22), to be embedded in the moulded manufactured article, can be mounted, the mould (10) further comprising a first pneumatic circuit (32A) able to apply a predetermined pressure, positive or negative, inside said mould (10), characterized in that said at least one insert-holding device (18) is operatively connected to a second pneumatic circuit (32B) able to apply a predetermined pressure, positive or negative, and it is internally provided with a plurality of means (34, 36, 38) configured for applying said predetermined pressure at said passage channel (24), said second pneumatic circuit (32B) being configured to apply, at said at least one insert-holding device (18), the same predetermined pressure value which generates inside the mould (10) by means of the first pneumatic circuit (32A). |
