Patent ID: 8079747

Claim:
A method for compounding a multimodal polymer composition, comprising, providing a body forming a chamber of two barrels housing two counter-rotating axis-parallel rotors, wherein said body has one opening for inflow and one opening for outflow of said multimodal polymer composition, wherein said inflow opening is a single supply port, supplying all of said multi modal polymer composition comprising a low molecular weight polymer and a high molecular weight polymer to said chamber through said single supply port at one end of said body, conveying said multimodal polymer composition through a first conveying section comprising screws on each rotor for feeding said multimodal polymer composition from said supply port downstream to a first mixing section, mixing said multimodal polymer composition in said first mixing section comprising at least two mixing zones for dispersive mixing of said multimodal polymer composition, each mixing zone of said first mixing section comprising on each rotor at least one forward conveying wing and at least one backward conveying wing downstream of the forward conveying wing, passing said multimodal polymer composition through a throttle valve downstream of said first mixing section, conveying said multimodal polymer composition through a second conveying section downstream of said throttle valve, said second conveying section comprising screws on each rotor, mixing said multimodal polymer composition in a second mixing section downstream of said second conveying section, said second mixing section comprising at least one mixing zone for distributive mixing of said multimodal polymer composition, said mixing zone of said second mixing section comprising on each rotor at least one forward conveying wing and at least one backward conveying wing downstream of the forward conveying wing, and discharging said multimodal polymer composition through a discharge port at the other end of said body.