Two-channel extrusion die for mooney correction

A two-channel extrusion die for Mooney correction to determine true shear viscosity of a resin,

• the two-channel extrusion die, comprising:
• a cylindrical body;
• two channels, each of the two channels having a circular and constant cross section and extending linearly throughout the channel along a longitudinal direction of the cylindrical body, and both inlets of the two channels existing in a plane perpendicular to the longitudinal direction of the cylindrical body, and
• a convex part adapting to an extruder;
• and
• when a big channel A being one of the two channels has a longitudinal length LA along the longitudinal direction of the cylindrical body and a diameter DA of a cross section perpendicular to the longitudinal direction, and a small channel B being the other of the two channels has a longitudinal length LB along the longitudinal direction of the cylindrical body, and a diameter DB of a cross section perpendicular to the longitudinal direction, all of three relations (i), (ii) and (iii) shown below being fulfilled, thereby causing each of the two channels to equally be under a given pressure head of from an inlet to an outlet of the channel during an extrusion operation of a fluid of the resin with the two-channel extrusion die:
• L
• A
• >
• L
• B
• (
• i
• )
• D
• A
• >
• D
• B
• (
• ii
• )
• L
• A
• /
• D
• A
• =
• L
• B
• /
• D
• B
• .
• (
• iii
• )