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Fabric dyeing machine - Padding mangle

Fabric dyeing machine 

There are certain types of machines that are used for the fabric dyeing process.

1. Jigger dyeing machine
2. High-temperature jigger dyeing machine
3. HT vacuum jigger dyeing machine
4. Winch dyeing machine
5. High-temperature beam dyeing machine
6. Pad dyeing machine
7. Jet dyeing machine
8. Soft overflow jet dyeing machine   

Pad Dyeing Machinery or Padder or Padding Mangle

A padding machine is an open-width device that may be wont to treat fabric in batches or continuously. it's typically utilised for continuous fabric processing. a really basic padding machine consists of two 'bowls' or rollers that crush the material that has been impregnated with liquor and a little trough to carry the padding liquor. 

The lower roll, often a product of ebonite, is quite hard whereas the highest roll is soft (coated with rubber). 

The function of the padder is to get rid of the surplus liquor absorbed by the material within the dyeing trough by uniformly squeezing the material across its entire width. The important parts of a padding mangle are:

(i) the most frames 
(ii) Tension elements
(iii) Padding mangle bowls 
(iv) The dye liquor trough
Three types of padding mangles used in textile processing
The mainframes are the product of rigid construction to resist heavy loads and vibrations.

The tension elements include a collection of automatic cloth guides, to stay the material in an exceeding state of uniform tension with no bowing.

The padding mangle bowls: Rubber with a surface hardness starting from 75 to 80 degrees, described in terms of shore hardness, covers the mangle bows. counting on the necessity and therefore the fabric being processed, there could also be two, three, or four bowls. 

The driven roll is often the lower bowl, although the opposite bowl may be lowered onto or elevated off of the lower bowl using mechanical or pneumatic pressure. when the underside roll is run and therefore the two bowls are nearly touching. because of frictional contact, the highest roll also rotates. 

Three types of padding mangles used in textile processing
Three types of padding mangles used in textile processing

Within the limitations of the padding mangle being utilised, the expression or pressure of contact between the two bowls can be adjusted to any desirable degree. 

As stated in a previous chapter, when a padding mangle is set to give an "expression," let's say 100%, it simply means that the pressure of contact is such that, as the fabric emerges from the mangle, it contains a quantity of liquor equal to its dry weight. Similar to this, a mangle with a 120 per cent expression would result in a wetter cloth, and so forth. 

The padding operation consists of the following functions:

1. Submerging or dipping the fabric in a solution containing dyestuff or another composition for treatment to speed up the diffusion and penetration of the solution into the fabric It mostly aids in moistening and swelling textile materials while also removing air from them. 
2. Mangling the fabric between the two bowls to compress it at the nip and force the alcohol into it by applying pressure to it.
3. The simultaneous forward movement of the textile material. Padding mangles come in many different varieties. 

Depending on the cloth to be treated and the method being used, a particular kind is selected. Below are some illustrations of padded mangles, which are also seen in Figure.
a Two bowl padding mangle
b. Three bowl padding mangle
c. Four bowl padding mangle. 


Questions -

  1. What are the types of dyeing machines used for the fabric dyeing process?
  2. Describe the padding mangle machine for the fabric dyeing process.

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