Tag Archives: Textile Machineries

Functions Of Knit Fabric Dryer | Checking Parameters Of Dyed Knit

Dryer is the third steps of finishing process of knit fabric. After passing hydro-extractor and de-watering machine, the knit fabrics enter into the dryer. It is important to know about the efficiency of the dryer and production capacity. I have written about dyed yarn drying process in one of my blog.

Functions of Dryer: Various types of functions are achieved by the dryer. Following functions are most common.

  • To dry the fabric.
  • To control the overfeed system.
  • To control the vibration which increase the G.S.M.
  • To control the shrinkage% of the fabric.
  • To control the GSM of the fabric.
  • To match the shade of the fabric.
  • To adjust the tone of the fabric.

Dryer: Various types of dryer are used for dry the knit fabric. I have present two dryer profiles for getting general idea about the fabric dryer.

Machine name Dryer
Brand Ruckh
Origin Germany
Speed 4-30 m /min
Temperature range 100-180 C
No of chamber 3
No of blower 6
Production capacity applied for Open and tube fabric
No of rotamatic burner 2

Another dryer,

Machine name

Dryer

Brand

Dilmenler
Origin Turkey
Speed range 4-30 m/min
Temperature 110-220 C
Used utilities Electricity, Gas ,Compressed air
No of motor 8
Capacity 8 ton per day
Chamber 3
Applied for Open and tube
No of rotamatic burner 3

Checking Parameters: During drying of the fabric, various types of quality test are carried out to be confirming out the requirements of the delivery products. Dried knit sample is stored for future proof. Following parameters are checked in drying section.

  • Shade Check: After drying of the fabric, dried sample shade is checked with customer approved swatch. If any deviation is found then the operator informs his shift officer, who takes necessary steps to overcome the problem. In dryer, shade of the fabric is adjusted by changing the machine parameter depending on the shade type. Experienced personnel are required for doing this shade checking.
  • Width Check: Width of the fabric adjusts in drying process. Operator measures fabric width by using measuring tape and compare with required width.
  • Weight Check: Weight of the fabric is checked by cutting the fabric by GSM cutter and weighted it by electronic balance. After taking the weight of the fabric, it compare with the standard weight.
  • Fabric Faults: Various types of knitting and dyeing faults are checked after drying.

So, dryer plays an important role in finishing section.

Process Sequence of Finishing Machineries | Finishing Process Of Knit

Finishing machineries are used for applying various types of finishes to the fabric or textile materials. All the finishing sequence is not same. Finishing sequence depends on the material types. Say, dyed yarn finishing process or garments finishing process is not similar as knit fabric finishing process. Although, finishing sequence of open form and tubular fabric form is not similar.

After dyeing, knit fabric is required to finish. During dyeing all knit fabrics are dyed in tubular form. Knit fabrics are finished in open or tubular form according to the buyer’s requirement.

Here, I have given various finishing process line, which is maintained in a dyeing and finishing unit.

Following machineries are used for tubular form fabric finishing:

Hydro-Extractor Machine

De-Watering Machine

Dryer

Tubular Compactor

Following machineries are used for open form fabric finishing:

Hydro-Extractor Machine

De-Watering Machine

Dryer

Slitter Machine

Stenter Machine

Open Compactor

Following machineries are used for collar and cuff finishing:

Hydro-Extractor

Softening Machine

Dryer

So, it is the finishing sequence of knit fabric.

De-Watering Machine Parts And Their Functions

De-Watering machine plays an important role in finishing section of the knit fabrics. De-watering machine is used for reducing remaining water of the wet fabric. It reduces the water content of the fabric.

De-Watering Machine Parts and Their Functions: De-watering machine has different parts and every single part has specific functions. Followings are de-watering machine parts name with their functions.

  1. Spreader: When fabric is dye in a dyeing machine it found in rope form. After dyeing, when dyed fabric is put in basket it also remains in rope position. By spreader we can open fabric from the rope position. It can be spread and compressed in width direction by its hydraulic cylinder.
  2. Hand Wheel: It is a manual process. It is used for guide the spreader.
  3. Turn Tube: Fabric rotation is controlled by turn tube. It also helps in fabric feeding to the spreader.
  4. Squeezing Roller: It is the main part of the de-watering machine. Water of the wet fabric is squeezed by the squeezing roller.
  5. Guide Wheel: Guide wheel helps to feed the fabric into the squeezing roller.
  6. Security Shield: Security shield is an emergency switch settled with a plastic board very near to the padder. When it is close to the padder it is on and when it is pulled back then it is off. In case a big knot is going to pass the padder then it immediately pulls back the board to stop the machine. It is an automatic system to ensure the security of the padder. It helps to avoid any types of incidence.
  7. Air Injection Switch: It pushes air into fabric to turn it to ballooning form. It helps to turn the rope form fabric into open form.
  8. Photocell: Photocell is an auto sensor which control air injection.

During de-watering process, softener is applying to the knit fabric. Also, various types of chemicals can be applied on the fabric by this de-watering machine. It is important to maintain uniform tension during operation otherwise GSM of the can be vary in different parts of the fabric.

I think it is important to know about the different parts of a de-watering machine. It also helps a textile engineer to be clear about a de-watering machine and its purpose of use.