# US 2026/0063528 A1 · Two-channel extrusion die for mooney correction

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- Number: US 2026/0063528 A1
- Document ID: US20260063528A1
- Status: Published application
- Kind: A1
- Application number: 18/817,702
- Filed: 2024-08-28
- Published: 2026-03-05
- Earliest claimed: 2024-08-28
- Assignees: Riken Technos Corporation
- Applicants: Riken Technos Corporation
- Inventors: Xuhui WANG
- Web page: https://patentgrep.com/patent/US20260063528A1

## CPC

- G01N 11/04: through a restricted passage, e.g. tube, aperture
- G01N 11/08: by measuring pressure required to produce a known flow
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

Disclosed is a two-channel extrusion die for Mooney correction to determine true shear viscosity of a resin, comprising: a cylindrical body; and 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 when a big channel A has a longitudinal length LA and a diameter DA of a cross section, and a small channel B has a longitudinal length LB and a diameter DB of a cross section, all of three relations (i) LA>LB; (ii) DA>DB; and (iii) LA/DA=LB/DB 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.

## Claims

### Claim 1

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
)

### Claim 2 (depends on 1)

The two-channel extrusion die according to claim 1, wherein a semicylindrical convex part is formed at a downstream end of the cylindrical body, and the big channel A passes through the semicylindrical convex part.

### Claim 3 (depends on 1)

The two-channel extrusion die according to claim 1, wherein a center of the big channel A and a center of the small channel B are each equidistant from a center of the cylindrical body in a cross section perpendicular to the longitudinal direction of the cylindrical body.

### Claim 4 (depends on 1)

The two-channel extrusion die according to claim 1,
wherein LA is 1.1*LB or larger and 2.0*LB or smaller, and
wherein DA is 1.1*DB or larger and 2.0*DB or smaller.

### Claim 5 (depends on 1)

The two-channel extrusion die according to claim 1, wherein LA/DA and LB/DB are each 5 or more and 50 or less.

### Claim 6 (depends on 1)

The two-channel extrusion die according to claim 1, further comprising a part connecting to an instrument to measure a temperature and/or pressure of a fluid of the resin to be extruded with the two-channel extrusion die.

### Claim 7 (depends on 1)

A system for making Mooney correction to determine true shear viscosity of a resin with a rheometer, comprising an extruder and the two-channel extrusion die according to claim 1 connecting to the extruder.

### Claim 8 (depends on 1)

A method of making Mooney correction to determine true shear viscosity of a resin with the use of the two-channel extrusion die according to claim 1, the method comprising the steps of:
extruding a fluid of the resin from the big channel A and the small channel B through the two-channel extrusion die connecting to an extruder, thereby collecting an extrude A from the big channel A and an extrude B from the small channel B;
measuring a weight A of the extrude A and a weight B of the extrude B;
calculating an apparent shear rate A from the weight A and an apparent shear rate B from the weight B;
applying Mooney correction to the apparent shear rate A and the apparent shear rate B, thereby determining a slip velocity of the fluid; and
calculating a true shear viscosity from the slip velocity of the fluid.