| CPC B29D 30/0601 (2013.01) [B29D 30/0605 (2013.01); B29D 30/0662 (2013.01)] | 10 Claims |
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1. A heating press for vulcanizing a vehicle tire under a vacuum, the heating press comprising:
a heating press upper part;
a heating press lower part;
a container having mold parts of a vulcanizing mold;
a cylindrical hood upper part enclosing the container is arranged on the heating press upper part;
the heating press upper part and the heating press lower part are connected to the container in such a way that, when the heating press upper part is being lowered through a stroke that takes place in an axial direction (P1), the mold parts of the vulcanizing mold can be closed in a radial direction (P2);
the hood upper part is arranged fixedly on the heating press upper part;
a diameter of the hood upper part is dimensioned such that said hood upper part can be pushed over the heating press lower part with a clearance and said hood upper part has a length which is sufficient to form a closed hood interior space with the heating press lower part and heating press upper part when the vulcanizing mold is still open,
a vacuum-tight seal is arranged on that surface at which the hood upper part, when the hood interior space is closed, is pushed over the heating press lower part, in order to make the closed hood interior space sealable in a vacuum-tight manner,
wherein, in the course of a first stroke (H1), the heating press upper part can be moved in the axial direction (P1) in such a way that the hood upper part forms the vacuum-tight hood interior space with the heating press lower part, while the vulcanizing mold remains open in an air-permeable manner,
wherein a pump and a vacuum tank, by means of which a vacuum can be generated in the interior space of the hood after the first stroke (H1), are provided, wherein the vacuum tank and the pump are connected to the interior space of the hood, and wherein the vacuum tank and the pump are connected to one another, and
wherein, in the course of a second stroke (H2), the heating press upper part can be moved further in the axial direction (P1) in such a way that the vulcanizing mold can be completely closed under vacuum conditions in the interior space of the hood.
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8. A method for vulcanizing a pneumatic vehicle tire under a vacuum in the method comprising:
providing the heating press according to claim 1, and operating the heating press including the steps:
a) loading an opened heating press (1) by placing a green tire for vulcanization into a container (2),
b) moving a heating press upper part (4) through a first stroke (H1) in the axial direction (P1) toward a heating press lower part (6), until a closed hood interior space (12) composed of a hood upper part, the heating press upper part and the heating press lower part (6) is obtained, while the vulcanizing mold remains open,
d) opening a connection between a vacuum tank (11) and the hood interior space (12) in order to generate a partial vacuum, by way of pressure equalization between the vacuum tank (11) and the hood interior space (12), in the hood interior space (12) that has been closed in a vacuum-tight manner,
e) when the partial vacuum is obtained in the hood interior space (12): closing the connection between the vacuum tank (11) and the hood interior space (12), opening the connection between the hood interior space (12) and the pump (10), and pumping the remaining air out of the hood interior space (12) in order to generate the vacuum,
f) moving the heating press upper part (3) through a second stroke (H2), in the course of which the container (2) is moved in such a way that the vulcanizing mold is completely closed, and subsequently closing the connection between the hood interior space (12) and the pump (10).
g) vulcanizing the green tire and opening the connection between the pump (10) and the vacuum tank (11) and generating a vacuum in the vacuum tank (11), wherein the connection of the pump (10) to the hood interior space (12) and the connection of the vacuum tank (11) to the hood interior space (12) are each closed,
h) opening the heating press (1) by moving the heating press upper part (3) and removing the fully vulcanized tire.
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