1. PREPARATIONS FOR INTRODUCING THE MACHINE
54
1.4
Air Compressor
1.4.1
Compressed-air Requirements for Air Jet Weaving Machines and Precautions
for Piping
•
Compressed air to be used for weft insertion should satisfy the following requirements in order to
prevent weft miss and ensure fabric quality:
•
Precautions for piping
1.
When using sealing liquid such as screw locking agent, ensure that the liquid does not run
out. Wipe it away if it runs out.
2.
When using pipe-washing agent, be sure to wash the pipes with water after neutralization
washing.
3.
When using the spray type leak detection agent to prevent leakage from piping, ensure that
the agent does not adhere to the resin or rubber parts because it may adversely affect such
parts. Also when applying rust-preventive agent to the pipes, ensure that the agent does not
adhere to the resin or rubber parts.
1.4.2
Choice of Air Compressor Type and the Number of Compressors
It is recommended that you use a screw or turbo compressor for air jet weaving machines which fea-
tures small pressure fluctuation, weak vibration, soft noise, high compression efficiency and low dis-
charge temperature. (See the comparison table below.)
•
Dry
Dew point (under compression): 10°C
Use a dryer to remove moisture.
•
Not contaminated (oilless)
Oil content: 0.1 ppm or less
Please inquire of the compressor manufacturer about the
details.
•
Constant pressure
Compressor discharge pressure:
0.8 to 1.0 MPa G (8 to 10 kg/cm
2
G)
Recommended input pressure to the weaving machine:
Maximum working pr0.1 MPa G (+1 kg/cm
2
G)
The minimum required input pressure to the loom depends
on the reed space, revolving speed and weft yarn type.
(The pressure loss will increase if the pipe is small in diame-
ter or has many bends.)
Pressure variation:
Nominal pressure ±0.05 MPa G (±0.5 kg/cm
2
G)
(The compressor capacity is given in Subsection 1.4.2.)
•
Suitable temperature
It is desirable that the temperature of the discharged air be
almost equal to that of the weaving room.
Screw compressor
Turbo compressor
Reciprocating
compressor
Compressed air
Small pressure
fluctuation
No fluctuation (oil-free)
Wide range from low to
high pressure
Vibration
Weak
Weak
Strong
Noise
Soft
Soft
Loud
Efficiency
High
High
Low
Discharge temperature
Low
Low
High
Size
Medium
Medium to large
Medium
Maintenance cost
Middle
Low
High
Type
Specifications
