Abstract: Device for distributing thermoplastic or like material introduced into a feed assembly of a die for manufacturing multi-layer sheets which is connected to at least two supplies and comprises an assembly of elements (10 to 13) juxtaposed in such manner as to define a central channel (16) and including at least one radial channel (18, 25, 29, 32) opening into said central channel (16), the device comprising, in the region of the junction of the radial channel (25, 29, 32) supplying additional material introduced on the receiving material previously introduced into the central channel (16), a progressive regulating means (50) disposed in each corresponding element (11, 12, 13) of the feed assembly so as to instantaneously modify in the plane of superimposition of the thermoplastic materials the cross-sectional shape of the corresponding stream of additional material in the central channel (16) so as to obtain the desired distribution of this material in the sheet at the outlet of the die.