Textile Dryer | Working Principle of Drying Machine | Operational Parameters of a Dryer

Textile Dryer:
Drying is done after de-watering of fabric. In textile finishing unit; dryer uses for dry the knit, woven fabrics and dyed yarn. But the drying process and drying mechanism of yarn and fabrics is different from one to another. The main functions of a textile dryer is to dry the textile fabrics. Drying is defined as a process where the liquid portion of the solution is evaporated from the fabric. 
 
 
Textile Dryer
Considering points for selecting a dryer: Following points should consider during buy a dryer. 
  1. Heating methods: The textile fabrics may be heated by gas burner or steam.
  2. Chamber: Number of chamber.
  3. Burner: Number of burner.
Working Principle of Dryer :
After de-watering then the fabric through the dryer. The main function of the dryer is given below,
  1. To dry the fabric.
  2. To control the overfeed system.
  3. To control the vibration which increase the G.S.M.
This machine contains two chambers. Two mesh endless conveyors are placed lengthwise to the chamber named conveyor net and filter net, each chamber contain a burner, which supply hot air .This hot air is guided through the ducting line by suction fan .There are nozzles placed in between filter net and conveyor net. When the fabric pass on the conveyor net, hot air is supplied to the wet fabric to dry it. There are exhaust fan which such the wet air and deliver to the atmosphere through the ducting line.
Fig: Passage Diagram of The fabric in Dryer Machine.
The speed of the dryer depends on the temperature of the m/c & the G.S.M of the fabric . If the m/c temp. is high then m/c speed also high and the m/c temp. is low then m/c speed also low . The vibration speed of the m/c for heavy fabric is 730 m/min and normal fabric is 480 m/min .

The temp. of different chambers according to the shade of the fabric:

Shade
Chamber-1
Chamber-2
Light
1200c
1300c
Medium
1350c
1400c
Deep
1500c
1700c

Operating Parameters:
  1. Temperature:-Set the temperature between 1200C -1300C for white and 1500C -1700C for color fabric. GSM temperature Or, moisture content temperature
  2. Set the over feed up to 10~20% or as required to get finish G.S.M.
  3. Set the speed as much as possible (6~20m/min). GSM speed
Special Feature of Dryer :
  1. Steam dryer ( two chambers ) .
  2. Vibration occur in heating zone .
  3. Process air pressure switch present .
  4. Maximum temp. increase up to 1700C .
  5. Steam control switch present .
  6. Two burners present .
  7. Two conveyor belt is present .
Parameters Used For Different Constructed Fabric:
For Cotton Fabric:


Fabric Type


Overfeed %


Temperature0C


Speed (m/min)


Folder Speed
(m/min)



Light
Color
Deep
Color
High G.S.M
Low G.S.M


Single Jersey

-15 % to-20%


1450C


1650C


6.5~7


8~9


2~3


Single Lacoste


-20 % to-25%


1450C


1650C


6.0~7


8~9


2~3

Polo Pique


-20 % to-25%


1450C


1650C


6.0~7


8~9


2~3


Interlock


-20 % to-25%


1550C


1700C


5~6.5


7~8


2~3

Rib


-5%


1450C


1650C


4~4.5


5~5.5


3~4


Grey Mélange


-20 %


1500C


1650C


4~4.5

5~5.5


3~4
 
For Polyester Fabric:
 

Fabric Type


Overfeed %


Temperature0C


Speed (m/min)


Folder Speed
(m/min)



Light
Color
Deep
Color
High G.S.M
Low G.S.M


Single Jersey

-5%


1350C


1150C


10~12


8~10


4~6


Single Lacoste


-5%


1350C


1150C


10~12

8~10

5~6

Polo Pique


-5%


1400C


1150C


10~12

8~10

5~6

Interlock


-5%


1350C


1100C


6~8


8~9

4~5

Rib


-5%


1450C


1150C


4~4.5


4.5~6.0

5~6

Grey Mélange


-5%


1300C


1150C


6~8

5~5.5

5~6
 
N.B: For Polyamide: Temp range is 1100C~ 1150C.Speed range16~18;Overfeed range- 5%. This Data’s are varied depending upon the Gray G.S.M and Finished G.S.M and also on the dia of the fabric. All this parameters are suitable for G.G.S.M range 140~160 to get Fin.G.S.M 170~185 without Lycra Fabric.

Following things are also considered in case of Dryer machine:
  • If fabric is more Redder than the standard one, then reduce the temperature.
  • If fabric is more Yellower than the standard one, then increase the temperature.
  • If fabric is more Bluer than the standard one, then increase the temperature.
All This data’s are practiced in mills which may varied factory to factory. 

Machine Specification:
  • Brand Name: Santex ag 
  • Year of Manufacture: 1998
  • Company: Santex ag 
  • Type: Santastretch 2K/240,GM,IR,GFI
  • Origin : Switzerland 
  •  Max. Working Speed: 30 m/min
  • Model: CH-9555,Tobel 
  • Min. working Speed : 5~15 m/min
  • Overfeed Range : 0% to -25% 
  • Max. Temperature : 1850C
  • No of Chamber: Two 
  • No of Burner : 2  
 

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