Patent ID: 8535594

Claim:
A method for producing hollow plastic bodies by means of a heated molding tool, which forms a cavity, comprising the steps of: a. providing a material composite consisting of: i. a first panel or sheet layer of a first thermoplastic synthetic material, ii. a second panel or sheet layer of a second synthetic material, and iii. a panel-like, open-cell or mixed-cell foam layer of a third synthetic material disposed between the first and the second layer; b. feeding the material composite to the opened cavity of a heated molding tool; and c. closing the molding tool, wherein pressure is applied onto the material composite at least in some sections such that, in the pressurized sections, at least one of the first layer and the second layer is thermoformed and the foam layer is compressed, which results in a permanent deformation of at least one of the first layer and the second layer, and of the foam layer; and further comprising a process control in which at least one of the first layer and the second layer, in the molding tool, detaches partially from the foam layer in such a way that the foam layer is in mechanical contact with at least one of the first layer and the second layer substantially only in the compressed sections.