Method for producing a compound element with two metal, plastic or wooden cover layers bracketing a plastic core layer involves introduction of the latter in liquid state in at least two steps
The method for producing a compound element with two metal, plastic or wooden cover layers (i, iii) bracketing a plastic core layer (ii) involves introduction of the latter in liquid state in at least two steps. Independent claims are also included for (a) (a) a resultant compound element (b) (b) sh...
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