A plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3) comprises at least one moulding unit (15) composed of two half-moulds (17a, 17b), each mobile relative to the other half-mould (17a, 17b) between a position of opening and a position of closing at le
A plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3) comprises at least one moulding unit (15) composed of two half-moulds (17a, 17b), each mobile relative to the other half-mould (17a, 17b) between a position of opening and a position of closing at least two cavities (19) for blow-moulding containers (2); the two half-moulds (17a, 17b) being oriented in such a way that they close in a closing plane (20) that is substantially tangent to the feed path (P) of the moulding unit (15).
대표청구항▼
1. A moulding unit for a plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3), the moulding unit being movable along an annular path (P) and comprising two half-moulds (17a, 17b) positioned one on the inside and the other on the outside of the path (P),
1. A moulding unit for a plant for blow-moulding plastic containers (2), particularly bottles, from respective parisons (3), the moulding unit being movable along an annular path (P) and comprising two half-moulds (17a, 17b) positioned one on the inside and the other on the outside of the path (P), the half-mould (17b) on the outside being movable about a substantially vertical pivot axis (18) relative to the half-mould (17a) on the inside between a position of opening and a position of closing at least two cavities (19) for blow-moulding respective containers (2); the two half-moulds (17a,17b) defining a closing plane (20) that is substantially tangent to the path (P), wherein both half-moulds (17a, 17b) are movable away from each other through different angles between respective open and closed positions, the angle of movement of the half-mould (17b) on the outside towards the outside of the path (P) being greater than the angle of movement of the half-mould (17a) on the inside towards the inside of the path (P),wherein the half-mould (17a) on the inside of the path (P), in the respective open position, is rotated a predetermined angle apart from a position of finished blow moulded articles, inwardly with respect to said closing plane (20) that is substantially tangent to the path (P). 2. The moulding unit according to claim 1, comprising a closing element (501) that is vertically movable between a raised position where it is partly inserted between the half-moulds (17a, 17b) in the closed position to form a mould bottom wall, and a lowered position where it does not impinge on the half-moulds (17a, 17b) so that the container (2) can be extracted from the mould after blow-moulding. 3. The moulding unit according to claim 2, wherein the closing element (17a, 17b) comprises an upper portion (503) shaped in such a way as to impinge on an edge of an opening formed at the bottom of the half-moulds (17a, 17b) when they are in the closed position. 4. The moulding unit according to claim 3, wherein the upper portion (503) of the closing element (501) forms an annular surface (504) shaped to match portions (505) of the inside surface of the half-moulds (17a, 17b), said matching surfaces being designed to hermetically seal the opening at the bottom of the half-moulds (17a, 17b) when they are in the closed position. 5. The moulding unit according to claim 4, wherein said surfaces (504, 505) have at least one downwardly converging, tapered portion. 6. The moulding unit according to claim 1, comprising a mould (16) defining two moulding cavities (19). 7. A blow-moulding machine comprising a carousel and a plurality of moulding units associated with the carousel, wherein said moulding units are moulding units according to claim 1. 8. The moulding unit according to claim 1, wherein the two half-moulds (17a, 17b) have corresponding contact surfaces, said contact surfaces being in contact with each other to define the closing plane in the closing position, wherein the half-mould (17a) on the inside of the path (P), in the respective open position, has its contact surface rotated inwardly, with respect to the closing plane (20) tangent to the path (P), of the angle of movement of said half-mould (17a) on the inside of the path (P), relative to the direction of rotation of the mould along the path (P). 9. The moulding unit according to claim 1, wherein the moulding unit comprises a vertical shaft defining said pivot axis (18), and wherein the two half-moulds (17a, 17b) have corresponding ends configured to partially embrace said shaft, whereby each one of the two half-moulds (17a, 17b) is hinged to said shaft. 10. The moulding unit according to claim 9, wherein said ends of the two half-moulds (17a, 17b) have corresponding fingers embracing the shaft and aligned in an alternating fashion along the vertical length of the shaft.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.