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An apparatus for shaping thermoplastic materials or for laminating backing parts includes a turntable driven by a rotary drive and having rests for receiving supporting devices for lower molds or backing parts. The turntable has a plurality of receiving places which can enter alternately into a prel

An apparatus for shaping thermoplastic materials or for laminating backing parts includes a turntable driven by a rotary drive and having rests for receiving supporting devices for lower molds or backing parts. The turntable has a plurality of receiving places which can enter alternately into a preliminary blowing box, where a molded part can be shaped in conjunction with an upper mold arranged on an upper table. The preliminary blowing box has a front wall with an opening, facing the rotary drive. The turntable has a separating wall with flanges on both side which engage a wall indentation which surrounds the rotary drive and consequently bounds the preliminary blowing box, in order to seal the opening. A seal which can be shaped by means f a pressure medium and can be pressed against the separating wall is located in the front wall of the preliminary blowing box about the opening.

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1. An apparatus for shaping thermoplastic materials or for laminating backing parts, said apparatus comprising a preliminary blowing box comprising a fixed wall having an opening therein, a working station in said blowing box, a supporting device for an upper mold in said preliminary blowing bo

1. An apparatus for shaping thermoplastic materials or for laminating backing parts, said apparatus comprising a preliminary blowing box comprising a fixed wall having an opening therein, a working station in said blowing box, a supporting device for an upper mold in said preliminary blowing box above said working station, a turntable having a plurality of receiving places, each receiving place receiving a supporting device for a lower mold, each receiving place being separated from an adjacent said receiving place by a separating wall, said turntable being rotatable so that said separating wall closes said opening but for a small gap when one of said receiving stations is positioned so that a supporting device thereon is located below an upper mold at said working station, and a seal which can seal off said gap when said supporting device for a lower mold is located underneath said upper mold at said working station. 2. A apparatus according to claim 1, wherein the seal is arranged on the fixed wall of the preliminary blowing box and can be pressed against the separating wall. 3. An apparatus according to claim 1, wherein the seal is arranged on the separating wall and can be pressed against the fixed wall of the preliminary blowing box. 4. A apparatus according to claim 1, wherein the fixed wall of the preliminary blowing box has a groove around the opening, and the seal is formed as a fixed seal arranged in the groove and can be pressed against the separating wall by a pressure medium. 5. An apparatus according to claim 4, wherein the seal is retractable after the pressure medium is switched off. 6. An apparatus according to claim 4, wherein the seal is retractable under negative pressure. 7. An apparatus according to claim 1, wherein the seal is formed as a tubular seal which can be connected to at least one of a pressure source and a negative pressure source. 8. An apparatus according to claim 2, further comprising a rotary bearing and a rotary drive under the turntable the fixed wall of the preliminary blowing box being formed around the rotary bearing and the rotary drive with an indentation, said turntable having a flange on each side of said supporting wall each flange cooperating with said indentation to form a gap which is sealable by the seal arranged on the fixed wall. 9. An apparatus according to claim 1, wherein the turntable has at each receiving place two rests, which serve for receiving a supporting device for a lower mould or a backing part, which rests can be transferred from a holding position for the supporting device into a letting-through position, in which a lower mold can be changed by lowering the supporting device for the lower mold. 10. An apparatus according to claim 1, wherein said supporting device for an upper mold comprises a lifting table arranged above the turntable. 11. An apparatus according to claim 1, said supporting device for an upper mold comprises a sliding table which is vertically movable, whereby a plurality of upper mold can be used. 12. An apparatus according to claim 1, wherein said supporting device for an upper mold comprises a mold receptacle which is mounted so that it can be rotated and driven. 13. An apparatus according to claim 12, wherein the mold receptacle is vertically movable. 14. An apparatus according to claim 1, wherein said turntable has two receiving places with an axis of symmetry therebetween, said separating wall passing through said axis of symmetry.