FLAT-SLIT TWO-CHAMBER HEAD Russian patent published in 2009 - IPC B29C47/14 

FIELD: mechanics.

SUBSTANCE: proposed device comprises five elements representing perforated plates interjointed to form chambers. The first plate has inlet hole. The second plate has hole forming primary chamber. The third plate has four through curved slots. The second plate hole repeats outer edges of the third plate slots. The fourth plate is identical to the second one and forms secondary chamber. The fifth plate has outlet slot. The third plate makes partition between the said primary and secondary chambers to distribute ductile material from the inlet hole over the primary chamber and to its edges and to pass via aforesaid through slots into the secondary chamber in beeline. The proposed arrangement allows equal resistance against passage of all parts of ductile material flow that provides for expanded range of produced films or sheets.

EFFECT: reduced variation in film or sheet thickness over all width, possibility of using various-viscosity materials and various pressures without additional adjustments.

4 cl, 6 dwg