This document provides information about Muyang MY series single-screw extruders. It discusses the application of these extruders in producing pet food and aquafeed. It compares single-screw and twin-screw extruders. The document also covers technical parameters like capacities for different models, process parameters for floating and sinking aquafeed production, and configuration requirements. Production references are given and wear parts like the extruding rotor are described.

2. Application
Machine highlights
Technical parameters
Extrusion process
Production reference
Wear parts

3. Application
 Muyang MY series Single-screw Extruder is suitable for both the sinking and
floating aquafeed production.
 It is also widely used for pet food production.
 As for other applications in new fields, please consult Muyang technical
experts.

4. Application

Protruding-end pellet

Flat-end pellet

Oil-rich pellet (17%)
Widened
Extrusion
Capability

Varied in shape and
color

Small pellet (Φ 1.0
mm)

5. Application
Machine highlights
Technical parameters
Extrusion process
Production reference
Wear parts

6. Structure highlights
 Anti-bridge feeder
 Conditioner
 Extrusion parts
 Water and steam pipeline system
 Cutter device
 Control system

7. MY single-screw extruder
Conditioner
Support bracket
Cutter device
Principal
machine

8. Anti-bridge feeder
 Ensure smooth
and precise feeding

9. Anti-bridge feeder
 Anti-bridge design;
 Batch type automatic feeding;
Material
Flow
control
 Gravimeter for flow detection
and variable-frequency motor
for flow control together with
Feedback
Computer
the computer, make up a
closed-loop circle for feeding
control.
 Feeding accuracy is 0.1kg.
Flow
detection
Flow settings

10. SCTZ Conditioner (DDC)
Gelatinization (%) & Conditioning time (s)
Gelatinization
 Optimal paddle configuration
to increase material filling level,
prolong conditioning time and
improve gelatinization of
product, which finally
contributes to high capacity of
extrusion production.
％
Conditioning time (sec.)
Filling level ： 0%
Filling level ： 40%
Filling level ： 60%

11. SPTZ Complex Conditioner
Steam
Water
Steam
 Combining a one-cylinder conditioner with a DDC conditioner, the SPTZ complex
conditioner can improve not only the extrusion capacity but also the quality of
extrudates.

12. Conditioner configured to single-screw extruder
SPTZ Complex Conditioner
No.
Model
SCTZ Conditioner (DDC)
1
MY-135
SCTZ 28
2
MY-165
SPTZ 33
3
MY-215
SPTZ 39
4
MY-265
SPTZ 45

13. Comparison of gelatinization
60
Gelatinization can be around 15% higher
50
gelatinization
％
Complex
conditioner
40
30
DDC conditioner
20
10
0
30
60
90
120
150
180
210
240
conditioning time (sec.)
Note: Fresh water fish formulation, conditioner temperature 98 ℃, conditioning water 24%.

14. Principal machine
 L/D=13.1 to increase material retention time in the extruder;
 Combining the shearing effects of both screw and shear lock to increase
extrusion efficiency and pellet uniformity;
 New material applied in the manufacturing of wear parts, which prolongs the
service life by 2-3 times and ensure stable production.

15. Steam and water pipeline system
Steam to
extruder
chamfer
Steam to
jacket
Water
drainage
Steam
impurity
drainage
Water
to
jacket
condensate
drainage

16. Cutter device
Hand wheel
Positioning
lock
Motor
Cutter

New cutter device to ensure long time stable running;

A gap usually is generated between cutting knives and the die plate after long time running
and wearing. And it should be eliminated in order to obtain good appearance extrudates;

The new cutter device applied can eliminate the gap during production without down-time.

17. Control system

Muyang automatic control system
can simplify operation and
eliminate the impact of manual
operation;

All production data could be
recorded for production
management;

Advanced European control
elements applied to ensure
precise and reliable control;

Available of three control modes:
manual, commissioning and
automatic.

18. Single-screw VS. Twin-screw (1)
Item
Single-screw
extruder
Twin-screw extruder
Remarks
Conveying
manner
Feed mash is
convoyed forward by
friction and stickiness
Feed mash is forced to slid
forward
Single-screw extruder conveys
material mainly by friction,
resulting in relatively high wearing
and power consumption.
Granular of
finished pellet
>1.5 mm
>1.5mm
<1.5 mm
The product of single-screw
extruder is limited because of the
non-uniform distributed heat and
kneading effect.
Ingredient
adaptability
Common
( limited by moisture
content and fat content
of ingredients)
Wider (incl. ingredient rich of
moisture and fat)
Single-screw extruder can not
adapt to the ingredients that of small
friction .
Max. fat%
≤10%
＞ 17%(could be up to 25%)
Fat helps to reduce friction.
Max. H2O%
10% ～ 30%
5% ～ 95%
Moisture helps to reduce friction.
Heat distribution
of feed mash
Common
Uniform
Steam flashing
performance
Common
Excellent
Shearing force
when extruding
Strong
Common
Single screw extruder is of larger
backward pressure and shearing
force.

19. Single-screw VS. Twin-screw (2)
Item
Single-screw extruder
Twin-screw extruder
Remarks
Backflow
phenomenon
Common
Rare
Gap between screw and chamber wall
of single-screw extruder is larger.
Pressure on die
Non-uniform and will
affect capacity
Uniform
Material in single-screw extruder is
liable to flow back.
Product quality,
safety and variety
Good in quality and
safety, but the variety
is limited
Excellent in quality and
safety with a wide variety
Twin-screw extruder is of uniform
mechanical and thermal effect as well
as high moisture content.
Running
Stable and occasional
blockage
Stable and reliable
Operation
Required good
experience
Ease of operation and
control
Production pressure of single-screw
extruder is more sensitive to the
formula.
Production
Efficiency
Common
High
Twin-screw of good conveying and
extruding efficiency.
Power consumption
Relatively high
Relatively low
Twin-screw of good conveying and
extruding efficiency.
Machine price
Relatively cheap
Relatively expensive
Twin-screw is more complicate in
construction.
Capacity
Common
Relatively high

20. Application
Machine highlights
Technical parameters
Extrusion process
Production reference
Wear parts

21. Capacity of MY series Single-screw Extruders
No.
Model
Main motor
（ kW ）
Screw dia.
(mm)
Pet food
（ kg/h ）
Floating aquafeed
（ kg/h ）
Sinking aquafeed
（ kg/h ）
1
MY-135
90
135
1600~2500
1600~2500
500~1500
2000~3500
2000~3500
2000~3000
160
3000~6000
3000~6000
2000~4000
250
6000~9000
6000~9000
3000~6000
8000~12000
8000~12000
3000~6000
10000~15000
10000~15000
5500~12000
110
2
3
MY-165
165
MY-215
215
315
4
MY-265
400
265

22. Capacity & die opening area
Floating aquafeed:
Die opening area (mm2)
Capacity(t/h)=——————————————
200~250mm2/t · h
Sinking aquafeed:
Die opening area (mm2)
Capacity(t/h)=——————————————
550~600mm2/t · h

23. Process parameter control for floating aquafeed production
Parameters
Single-screw extruder
Temperature prior to die discharging
125-135 ℃
Moisture prior to die discharging
25-27%
Bulk density after discharge
320~440kg/m3
Moisture of extruded product
21-24%
(Flash by 3-4%)
Pressure of discharging barrel
Floating-sinking knee point
34-37 atmos
480kg/m3

24. Process parameter control for sinking aquafeed production
Parameters
Conditioning moisture
Conditioning temperature
Single-screw extruder
19-23%
80℃
Bulk density after discharge
490~550kg/m3
Moisture of extruded product
22-27%
Pressure of discharging barrel
Final gelatinization
20-29 atmos
90-95%

25. Requirements to formulation
Materials
Floating feed
Sinking feed
Starch
≥20%
≥10%
Oil
≤5%
4%~12%
Fat
≤17% (single-screw)
_____
Extrusion coefficient
1.8
1.1-1.3
Note that the feed formulation should not contain too much animal protein, especially that
for floating aquafeed.

26. Requirements to formulation
Die hold dia.Φ （ mm ）
1.0
Max. granular of ground material （ mm ）
0.1
1.5
0.15
2.0
0.3
2.5
0.5
3.0
0.8
4.0
1.0
5.0
1.2
 For aquafeed production, the granular of ground material usually should be controlled at
>5.0
1.2
20 mesh (0.85mm), for the production with die hole smaller than 1.5mm, make sure at least
98% material could pass through the 60 mesh sieve.
 Fiber in the formulation should be clean away in time to ensure smooth operation,
especially for the production of small aquafeed.

27. Requirements to working condition
1. Environment temperature for normal use is within -10 ～ +40℃;
2. Relative moisture content for normal use is within 30~85%;
3. Altitude for normal use is lower than 1000 m;
4. Keep the room where extruder working clean and ventilated;
5. Keep the extruder far away from corrosive gas, explosive gas and steam;
6.Power supply ： refer to motor nameplate ； air pressure ≧0.6Mpa;
7.Keep enough space around the extruder for easy operation, repair and maintenance;
8.Make sure the machine is level.
9.The vibration should not exceed12 mm·s-1
Under other working conditions, please consult Muyang technical experts.

28. Application
Machine highlights
Technical parameters
Extrusion process
Production reference
Wear part

29. Extrusion process
After extrusion, drying, coating, cooling and grading, the finished product of expanded
aquafeed is featured by controllable density, wide raw material adaptability, good water
stability and high feed conversion ratio.
See Fig.1~Fig.4, the four common aquafeed extrusion processes. Those shown in
Fig1. and Fig.2 are recommended.

30. Process configuration
Extruder
No.
Item
MY135
MY165E
MY215
MY215
MY265
1
Main power (kW)
90
160
250
315
400
2
Aquafeed capacity (t/h)
1.5 ～ 2.0
3.0 ～ 6
6.0 ～ 8.0
6.0 ～ 11.0
10.0 ～ 15.0
Fan
Steam
aspiration
system
T40No4
N=1.5Kw
n=2900rpm
5-48-12No
N=3Kw
n=2900rpm
Cyclone
/
X55-Φ700
Airlock
/
GFZY-6
Air pipe dia.
(mm)
3
Branch pipe dia. Φ150mm;
Manifold pipe dia. Φ200mm
Branch pipe dia. Φ200mm;
Manifold pipe dia. Φ250mm
TDSG50
4
Belt conveyor (high
temperature resistance, 80
～ 90℃, free of oil)
TDSG40
5
Dryer
MGLZ22/ SKGW150-4
SKGD2000-5
SKGD2000-6
SKGD2000-8
SKGD2400-8
Induced-draft
fan
5-48-12No
N=7.5kw
n=2900rpm
4-72- No
N=18.5Kw
n=1800rpm
4-79- No
N=22Kw
n=1800rpm
4-79- No
N=30Kw
n=1600rpm
4-68No
N=55Kw
n=1000rpm
Cyclone
X55-Φ1000
X55-Φ1800
X55-Φ2000
X55-Φ2400
X55-Φ2200x2
Airlock
GFZY-8
Air pipe dia.
(mm)
Φ340
Φ610/Φ800
Φ800/Φ1000
6
Steam
exhaust
system
GFZY-10
Φ400+Φ480/Φ600
Φ480/Φ700

31. 7
Elevator (high temperature
resistance belt, 80 ～ 100℃)
TDTGq36/23
TDTGq40/23
TDTGq40/28
TDTGq50/28
TDTGq50/3
2
8
Grading sifter
SFJH80X
SFJH110x
SFJH130x
SFJH140x
SFJH153x
9
Volume of coating bin
1 （ m3 ）
4 （ m3 ）
6 （ m3 ）
10
Continuous liquid coater
SYPL
SYPL
SYPL
11
Vacuum liquid coater
SYPZ90
12
Airlock
SLNF16x
(SLNF14x(QD))
SLNF22x
(SLNF19x(QD))
Fan
5-48-12No
N=7.5kw
n=2900rpm
4-72ⅡNo
N=15kw
n=2900rpm
Cyclone
X55-Φ1000
X55-Φ1400
Airlock
GFZY-8
Are pipe dia.
(mm)
Φ340
13
Aspiratio
n
system
for
cooling
14
Grading surge hopper
15
Ultra-fine grading sifter
16
Bagging machine （ belt
feeder type ）
3 （ m3 ）
SYPL
SYPL
SYPZ120
SYPZ150
SLNF24x
SYPZ200
SLNF28x
SLNF32x
4-7ⅡNo
N=18.5kw
n=2900rpm
4-72
N=30kw
n=1800rpm
4-68
N=37kw
n=1800rpm
X55-Φ1600
X55-Φ1800
X55-Φ2400
X551600x2
Φ700
Φ800
GFZY-10
Φ530
Φ610
Effective volume equal to that of mixer effective volume
SXFQ60 （ with 40 mesh screen, capacity up to 3t/h ）
SXFQ60 （ with 40 mesh screen, capacity up to 5t/h ）
LCS-50-BZ
Note: ①Equip an air-draft hood for the aspiration system over the outlet of extruder ; ② A movable chute, which serves as a by-pass for conveying
product between extruder and conveyor, should be equipped. The belt conveyor is reversed; ③circulating air system for drying should be equipped
according to the operation manual; ④ There should have a straight chute over the dryer with at least 500mm to ensure feeding efficiency.

32. Process configuration for pneumatic conveying

33. Application
Machine highlights
Technical parameters
Pelleting process
Production reference
Wear parts

34. Production reference
Currently, there are over 100 sets of Muyang MY series single-screw extruder
stably running in China and around the world. Satisfied customers include CP Group,
DaChan Food, Gold Coin, New Hope Group, Tongwei Group, etc.
……

35. Application
Machine highlights
Technical parameters
Process configuration
Production reference
Wear parts

36. Extruding rotor
Pressing lock
Kneading lock
Extruding rotor
For MY series single-screw extruder,
the screws, pressing locks and
kneading locks of extruding rotor are
all wear parts.
 Usually, the operating life of the
Screw
extruding screw is about 12,000 tons.

37. Extruding chamber
liner of
discharge
chamber
Liner of middle
section chamber
Liner of
feeding
chamber
Liner of pressure-relief
chamber
Wear part
Note ： For MY series single-screw extruder, all liners (6
sections) for extruding barrel and wear rings in fixed shear locks
Fixed shear lock
are wear parts.

38. Discharge assembly
Die plate holder
Distributing
cone
Fixed
holder
Cutter support
bracket
Venturi
element
Pressure regulated
ring
Die plate
Die plate assembly

39. Cutter structure
Knife carrier
Knife holder
Cutter shaft
Cutter motor
Cutting knife
Among above parts, cutting knife is wear part.

40. Wear parts from Muyang supplier
 Reducing motor: SEW, NORD, FLENDER, FALK…
 Pneumatic/Hydraulic components: FESTO, SMC, YSC, Spirax Sarco …
 Bearing: SKF, NSK, HWL…
 Electric components: Honeywell, Omron, Schneider, Schmersal …
……

41. Thanks for your time!
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