Method and device for blow-molding containers
The invention relates to a method and a device for blow-moulding containers from preforms which are previously heated in the region of a heating section and consist of a thermoplastic material. The preforms are transferred to a blowing device following the heating thereof, in which they are shaped to form containers by the application of a blowing pressure inside blow moulds. Said blow moulds respectively consist of at least two blow mould segments. The preforms are transported together with the blow moulds at least along part of a peripheral path of a rotating blow wheel. A separating plane of the blow mould segments is positioned at least in an opened state of the blow station in a rotational direction of the blow wheel, facing forwards, with an angle of inclination in relation to the radial direction of the blow wheel. The blow station is positioned at least in two parts during a transfer process.
1. A device for blow molding containers, which has a heating line for heating preforms injection molded from a thermoplastic, plastic material and is provided with a blowing system, which has at least one blowing station arranged on a blowing wheel for shaping the preforms into containers, in which blowing system the blowing station is provided with mold supports for supporting each blow mold segment, and in which blowing system a first mold support is mounted in such a way relative to a second mold support that the first mold support can swivel in relation about a hinge pin, wherein, at least in an opened state of the blowing station ( 3 ), a parting plane ( 41 ) of the blow mold segments is positioned in such a way that it is directed obliquely forward in the direction of rotation ( 55 ) of the blowing wheel ( 25 ) at an angle of inclination ( 43 ) relative to the radial direction ( 42 ) of the blowing wheel ( 25 ), wherein the second mold support ( 20 ) is rigidly connected with the blowing wheel ( 25 ) and is arranged obliquely to the radial reference plane ( 42 ), wherein the second mold support ( 20 ) that is arranged more towards the outside with respect to the radial direction of the blowing wheel ( 25 ) is rigidly connected with the blowing wheel ( 25 ), and wherein the angle of inclination ( 43 ) has a value in the range of 5-45°, the device further comprising a stretch rod for stretching the preforms.
2. A device in accordance with claim 1 , wherein in a closed state, the blowing station ( 3 ) is arranged in such a way with the parting plane ( 41 ) of the blow mold segments that the parting plane ( 41 ) is positioned obliquely relative to the radial reference plane ( 42 ) of the blowing wheel ( 25 ).
3. A device in accordance with claim 1 , wherein an axis of rotation ( 40 ) of a moving blow mold segment is arranged essentially vertically.
4. A device in accordance with claim 1 , wherein a supporting device for supporting a movable mold support ( 19 ) relative to an end support ( 58 ) is part of an articulated lever.
5. A device in accordance with claim 1 , wherein the blowing station ( 3 ) is configured to hold preforms ( 1 ) with their mouth sections ( 21 ) oriented vertically upward.
6. A device in accordance with claim 1 , wherein the blowing station ( 3 ) is configured to hold preforms ( 1 ) with their mouth sections ( 21 ) oriented vertically downward.
7. A device in accordance with claim 1 , wherein mold supports ( 20 ) that are rigidly connected with the blowing wheel ( 25 ) and mold supports ( 19 ) that can move relative to the blowing wheel ( 25 ) are alternately positioned along the outer periphery ( 61 ) of the blowing wheel ( 25 ).
8. A device in accordance with claim 1 , wherein the blow mold segments are mounted in such a way that they can be clamped relative to each other.
9. A device in accordance with claim 4 , wherein the articulated lever is designed as a toggle mechanism.
10. A device in accordance with claim 1 , wherein the angle of inclination ( 43 ) has a value in the range of 15-30°.
11. A device in accordance with claim 1 , wherein the angle of inclination ( 43 ) has a value of about 20°.