| CPC B29D 30/0601 (2013.01) [B29D 30/0605 (2013.01); B29D 30/0662 (2013.01)] | 11 Claims |
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1. A heating press for a tire, the heating press comprising:
a heating press upper part;
a heating press lower part;
a circular-ring-shaped hood upper part of a hood of the heating press upper part, the hood upper part having a container and mold parts of a segmented vulcanization mold in the container, wherein the heating press upper part is movable in an axial direction (P1) in such a way that the hood upper part is movable onto the heating press lower part to form a closed hood interior space;
a press plate arranged above the container in the hood upper part and moveable in the axial direction (P1);
at least one seal configured to establish vacuum-tightness between the heating press upper part and the heating press lower part;
a pump configured to generate a vacuum in the closed hood interior space;
the mold configured to be filled with a pressurized heating medium for a green tire and heated by internal heating;
wherein the heating press upper part is movable together with the press plate in the axial direction (P1) in to a first stroke (H1) so that the heating press upper part sits on the heating press lower part and the hood interior space is closed vacuum tight via the at least one seal, while the vulcanizing mold is open in an air-permeable manner; and
wherein the press plate is movable in the axial direction (P1) in a second stroke so that the mold parts move in a radial direction to completely close the vulcanizing mold under vacuum in the closed hood interior space.
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10. A method for vulcanizing a pneumatic vehicle tire under a vacuum in a heating press, the method comprising:
providing the heating press according to claim 1, and operating the heating press including the steps:
a) loading the heating press when opened by placing a green tire for vulcanization into the container (2),
b) moving the heating press upper part (3) through the first stroke (H1) in the axial direction (P1) toward the heating press lower part (6), until an end face (24) of the hood upper part (4) rests on the heating press lower part (6), obtain the hood interior space (12) which is closed in a vacuum-tight manner, while the vulcanizing mold is only closed to some extent,
d) opening the 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 press plate in the heating press upper part (3) through the 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) and unloading the fully vulcanized tire, and repeating the steps a)-h) in order to vulcanize each further tire.
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