US 12,629,877 B2Granted

Intermittent extrusion system and extrusion device

AssigneeWuyi University

InventorsHuiwen Yu, Haowen Chen, Baiping Xu

Life of this patent

Estimating the term…

Abstract

An intermittent extrusion system and an extrusion device are disclosed. The intermittent extrusion system includes a barrel and an extrusion unit. The extrusion unit includes a first screw and a second screw, both the first screw and the second screw are installed in the barrel and can rotate in the barrel, a screw thread of the first screw can mesh with a screw groove of the second screw, the first screw has at least one thread start, and the second screw has at least one thread start. The first screw rotates at a constant speed, while the second screw rotates intermittently, and a rotating direction of the first screw is opposite to that of the second screw.

Claims5

Dependent claims

An intermittent extrusion system, comprising:

a barrel;
and
an extrusion unit, the extrusion unit comprising a first screw and a second screw, both the first screw and the second screw being installed in the barrel, both the first screw and the second screw being able to rotate in the barrel, a screw thread of the first screw being able to mesh with a screw groove of the second screw, the first screw having at least one thread start, and the second screw having at least one thread start;
wherein the first screw is configured to rotate at a constant speed, while the second screw is configured to rotate intermittently, and a rotating direction of the first screw is opposite to that of the second screw;
wherein an inner diameter of the first screw and an inner diameter of the second screw are both d, an outer diameter of the first screw and an outer diameter of the second screw are both D, a center distance between the first screw and the second screw is C=(D+d)/2, the number of thread starts of the first screw is set to n, the number of thread starts of the second screw is set to m, and the following constraints are satisfied:
n
≤
3
⁢
and
⁢
m
≤
5
;
an end face curve of the first screw comprises an arc segment N1N2, a curve segment N2N3, an arc segment N3N4 and a curve segment N4N5, an end face curve of the second screw comprises an arc segment M1M2, a curve segment M2M2, an arc segment M3M4 and a curve segment M4M5, the curve segment N2N3 corresponds to the curve segment M2M3, the arc segment N3N4 corresponds to the arc segment M3M4, and the curve segment N4N5 corresponds to the curve segment M4M5;
a rectangular plane coordinate system xoy is established, an end face center of the first screw is O1, an end face center of the second screw is O2, coordinates of the end face center O1 of the first screw are (a, b), coordinates of the end face center O2 of the second screw are (0,0), an included angle between a connecting line of a point on the end face curve of the first screw and the end face center O1 and O1O2 is θ1, and an included angle between a connecting line of a point on the end face curve of the second screw and the end face center O2 and O1O2 is θ2;
an equation of the arc segment N1N2 is:
{
x
=
a
+
d
/
2
·
cos
⁢
θ
1
y
=
b
+
d
/
2
·
sin
⁢
θ
1
;
where θ1∈(−π/2m, 2π/n−3π/2m];
an equation of the curve segment N2N3 is:
{
x
=
a
+
C
·
cos
⁢
θ
1
-
D
/
2
·
cos
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
1
)
y
=
b
-
C
·
sin
⁢
θ
1
-
D
/
2
·
sin
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
1
)
;
where θ1∈(π/2m−arccos(C/D), π/2m];
an equation of the arc segment N3N4 is:
{
x
=
a
+
D
/
2
·
cos
⁢
θ
1
y
=
b
+
D
/
2
·
sin
⁢
θ
1
;
where θ1∈(−π/2m+(2m−1)π/m, π/2m+(2m−1)π/m];
an equation of the curve segment N4N5 is:
{
x
=
a
+
C
·
cos
⁢
θ
1
-
D
/
2
·
cos
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
1
)
y
=
b
-
C
·
sin
⁢
θ
1
-
D
/
2
·
sin
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
1
)
;
where θ1∈(3π/2m,3π/2m+arccos(C/D)];
an equation of the arc segment M1M2 is:
{
x
=
d
/
2
·
cos
⁢
θ
2
y
=
d
/
2
·
sin
⁢
θ
2
;
where θ2∈(−π/2m, π/2m];
an equation of the curve segment M2M3 is:
{
x
=
C
·
cos
⁢
θ
2
-
D
/
2
·
cos
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
2
)
y
=
-
C
·
sin
⁢
θ
2
-
D
/
2
·
sin
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
2
)
;
where θ2∈(π/2m−arccos(C/D), π/2m];
an equation of the arc segment M3M4 is:
{
x
=
D
/
2
·
cos
⁢
θ
2
y
=
D
/
2
·
sin
⁢
θ
2
;
where θ2∈(−π/2m+(2m−1)π/m, π/2m+(2m−1)π/m];
an equation of the curve segment M4M5 is:
{
x
=
C
·
cos
⁢
θ
2
-
D
/
2
·
cos
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
2
)
y
=
-
C
·
sin
⁢
θ
2
-
D
/
2
·
sin
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
2
)
;
where θ2∈(3π/2m, 3π/2m+arccos(C/D)].

368 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/678,197Filed 30 May 2024
Priority: CN 202410349070.126 Mar 2024
Published: US 2025/0303626 A12 Oct 2025
Granted: 19 May 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B29C 48/42
Using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders: non-identical or non-mirrored screws
B29C 48/2517
Design of extruder parts, e.g. by modelling based on mathematical theories or experiments: of intermeshing screws
B29C 48/2694
Extrusion in non-steady condition, e.g. start-up or shut-down: intermittent extrusion
B29C 48/40
Using screws surrounded by a cooperating barrel, e.g. single screw extruders: using two or more parallel screws or at least two parallel…

Family

US 2025/0303626 A1Pre-grant publication · published 2 Oct 2025
US 12,629,877 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Citations

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Abstract

An intermittent extrusion system, comprising:

a barrel;
and
an extrusion unit, the extrusion unit comprising a first screw and a second screw, both the first screw and the second screw being installed in the barrel, both the first screw and the second screw being able to rotate in the barrel, a screw thread of the first screw being able to mesh with a screw groove of the second screw, the first screw having at least one thread start, and the second screw having at least one thread start;
wherein the first screw is configured to rotate at a constant speed, while the second screw is configured to rotate intermittently, and a rotating direction of the first screw is opposite to that of the second screw;
wherein an inner diameter of the first screw and an inner diameter of the second screw are both d, an outer diameter of the first screw and an outer diameter of the second screw are both D, a center distance between the first screw and the second screw is C=(D+d)/2, the number of thread starts of the first screw is set to n, the number of thread starts of the second screw is set to m, and the following constraints are satisfied:
n
≤
3
⁢
and
⁢
m
≤
5
;
an end face curve of the first screw comprises an arc segment N1N2, a curve segment N2N3, an arc segment N3N4 and a curve segment N4N5, an end face curve of the second screw comprises an arc segment M1M2, a curve segment M2M2, an arc segment M3M4 and a curve segment M4M5, the curve segment N2N3 corresponds to the curve segment M2M3, the arc segment N3N4 corresponds to the arc segment M3M4, and the curve segment N4N5 corresponds to the curve segment M4M5;
a rectangular plane coordinate system xoy is established, an end face center of the first screw is O1, an end face center of the second screw is O2, coordinates of the end face center O1 of the first screw are (a, b), coordinates of the end face center O2 of the second screw are (0,0), an included angle between a connecting line of a point on the end face curve of the first screw and the end face center O1 and O1O2 is θ1, and an included angle between a connecting line of a point on the end face curve of the second screw and the end face center O2 and O1O2 is θ2;
an equation of the arc segment N1N2 is:
{
x
=
a
+
d
/
2
·
cos
⁢
θ
1
y
=
b
+
d
/
2
·
sin
⁢
θ
1
;
where θ1∈(−π/2m, 2π/n−3π/2m];
an equation of the curve segment N2N3 is:
{
x
=
a
+
C
·
cos
⁢
θ
1
-
D
/
2
·
cos
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
1
)
y
=
b
-
C
·
sin
⁢
θ
1
-
D
/
2
·
sin
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
1
)
;
where θ1∈(π/2m−arccos(C/D), π/2m];
an equation of the arc segment N3N4 is:
{
x
=
a
+
D
/
2
·
cos
⁢
θ
1
y
=
b
+
D
/
2
·
sin
⁢
θ
1
;
where θ1∈(−π/2m+(2m−1)π/m, π/2m+(2m−1)π/m];
an equation of the curve segment N4N5 is:
{
x
=
a
+
C
·
cos
⁢
θ
1
-
D
/
2
·
cos
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
1
)
y
=
b
-
C
·
sin
⁢
θ
1
-
D
/
2
·
sin
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
1
)
;
where θ1∈(3π/2m,3π/2m+arccos(C/D)];
an equation of the arc segment M1M2 is:
{
x
=
d
/
2
·
cos
⁢
θ
2
y
=
d
/
2
·
sin
⁢
θ
2
;
where θ2∈(−π/2m, π/2m];
an equation of the curve segment M2M3 is:
{
x
=
C
·
cos
⁢
θ
2
-
D
/
2
·
cos
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
2
)
y
=
-
C
·
sin
⁢
θ
2
-
D
/
2
·
sin
⁡
(
π
/
2
⁢
m
-
2
⁢
θ
2
)
;
where θ2∈(π/2m−arccos(C/D), π/2m];
an equation of the arc segment M3M4 is:
{
x
=
D
/
2
·
cos
⁢
θ
2
y
=
D
/
2
·
sin
⁢
θ
2
;
where θ2∈(−π/2m+(2m−1)π/m, π/2m+(2m−1)π/m];
an equation of the curve segment M4M5 is:
{
x
=
C
·
cos
⁢
θ
2
-
D
/
2
·
cos
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
2
)
y
=
-
C
·
sin
⁢
θ
2
-
D
/
2
·
sin
⁡
(
3
⁢
π
/
2
⁢
m
-
2
⁢
θ
2
)
;
where θ2∈(3π/2m, 3π/2m+arccos(C/D)].

368 more elements

Facts

Application

18/678,197Filed 30 May 2024

Priority

CN 202410349070.126 Mar 2024

Published

US 2025/0303626 A12 Oct 2025

Granted

19 May 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

B29C 48/42
Using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders: non-identical or non-mirrored screws
B29C 48/2517
Design of extruder parts, e.g. by modelling based on mathematical theories or experiments: of intermeshing screws
B29C 48/2694
Extrusion in non-steady condition, e.g. start-up or shut-down: intermittent extrusion
B29C 48/40
Using screws surrounded by a cooperating barrel, e.g. single screw extruders: using two or more parallel screws or at least two parallel…