Friday, October 11, 2019

MIXING AND BLOW ROOM, A SPINNING PROCESS

MIXING AND BLOW ROOM:

The blowroom is the first operational assembly of different machines in spinning of yarn which open , beat, clean the cotton and produce lap or even feed of material for the next process.

Objectives of mixing:

following are the main objectives of mixing:

To reduce the yarn cost by adding some cheaper cotton. 
To find desired yarn properties by adding various cotton varieties in mixing.

Objectives of blow room: 

the main objectives of blowroom are given below;

To open the cotton tufts.

To clean the fibres.

To remove the dirt and dust from cotton fibres.

To prepare  the lap ( cotton sheet ) of the fibres.

To Mix and blend of various varieties of cotton.

To recycle the waste material.

Opening of the cotton tufts:

The cotton fibre reaches in the mill in the form of compressed bales. Due to compact and compressed packing of cotton bales, the cotton changes into very big tufts and lumfs. Thus this cotton necessitates to well open the fibres. This action is carried out with the help of openers in blowroom line. Very high degree of openness is achieved in opening process. The tufts and lumfs are broken by using various opener and beaters having blades. The smallest  possible  tuft size is achieved in this process. Very high degree of care is always taken to minimize the fibre loss during opening process. The degree of tuft opening also helps to maximize the cleaning of dirt, dust,broken seeds and trace etc.

Cleaning of the fibres:

Since cotton reaching to spinning mills contains many impurities in it, so that it requires to clean perfectly during spinning. This is well known fact that impurities may be eliminated from the surface of  the material only. The surface area of material is increased up to optimum level by opening process. Blowroom assembly does not remove full impurities. It eliminates 40% - 70% impurities from cotton. Cotton contains almost 18% trash. During the cleaning the fibres are also eliminated with trash and foreign materials. The amount of  removed waste is observed a nd this waste is analysed to find the waste composition. The cleaning efficiency of process is determined with the help of recodded data. It should always keep in mind that we have to increase the cleaning efficiency upto optimum level , not upto maximum level.

Removing the dirt and dust from the cotton fibres:

Foreign impurities( leaf, stone,iron particles, polyethene sheet, fibres of PP packaging, feather of birds and coloured fibres are removed from the cotton during opening and beating operations. It is very important task of blowroom assembly. The dust removal in blowroom is done by air suction device. This air  suctioning is used either between the machines such as dust cages, dust extractors or within the machine by normal air separation.

Mixing and blending of different varities of cotton:

The main objectives of mixing is economy of production, to achievement of desired yarn quality and  improvement  of yarn performance. In mixing process, Two or more different varieties of cotton are mixed together.  Some times two or more types of fibres such as cotton and polyester are mixed together in this process. The material is mixed and blended well to find the homogenious mixture of material. The possibility of random effect is terminated almost. Even effect of material through out the whole yarn surface is achieved.

Preparation of lap( even feed of material):

In the conventional belowroom assembly, a sheet of cotton fibre is prepared for even feeding of further process. This lap has even thickness and fixed width. The long continuous length of cotton sheet (lap) is wound on roll. This is feed to carding machine. Now these days, automatic tuft feeding installations are widely used.

Standards requirements of blowroom line assembly:

A  modern blowroom line assembly requires standerd given below:
maximum working effiency.
the cost effective operation.
Ability to fit in maximum dimensions.
maximum safety . 
Easy operation. 
minimum maintenance.
• minimum maintenance cost
Good setting stability.
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