8/18/2019 An Overview of Doffer in Carding Machine

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An Overview of Doffer in Carding Machine

An Overview of Doffer in Carding Machine

Bhavdip Paldiya

Dept. of Textile Technology

Sarvajanik College of Engineering & Technology, Surat, India

Cell: +91 9662020909

Email: bhavdipk9009@gmail.com

What is Doffer?

Doffer is a revolving cylinder, or a vibrating bar, with teeth, in a carding machine, which doffs, or strips off, the

fiber from the cards.

Doffer in carding machine

Object of  Doffer:

The main object of the doffer is to take off the fibres that lie more or less evenly distributed between the cylinder 

wires, and to condense them so that they constitute a coherent web.

Types of Doffer:

There are two types of doffer in carding.

1. Single doffer 

2. Double doffer 

Specification of Doffer:

DIAMETER:-27’’dia

SPEED:-45rpm/minute

WIRE POINT PER INCH:-300-400

SURFACE SPEED ratio:-53.3

DIRECTION:-CLOCKWISE

Doffer Wires:

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8/18/2019 An Overview of Doffer in Carding Machine

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The doffer strips the fibres from the cylinder. The rate of transfer is called the transfer ratio. The transfer needs to

be optimised to reduce the re-circulation on the cylinder to a minimum. The specification of the doffer wire,

together with the card settings will define the correct operation of the transfer of the fibres from doffer to cylinder.

Doffer Wire Maintenance:

Doffer is still working with a concept of Land formation. A normal grinding machine will be good for doffer 

grinding. All the wire points should be touched by the grinding stone. A slow and gradual grinding with the

grind-out concept will give the best results. Harsh grindings will result in burr formation on the land. Thiswill increase the number of hooks in the fibre; thereby the effective length of the fibre from this card will be

reduced.

Flat tops grinding is very important. Every time a flat top is ground, yarn quality is improved. It is better to

use a grinding machine with the emery fillet. Frequent flat tops grinding will result in less neps and the yarn

quality will be consistent.

Some mills increase the life of the flat tops compared to cylinder wire. But it is better to change flat tops

and cylinder wire together for better and consistent yarn quality.

It is a good practice to check the individual card quality before changing the wire

Uses and Characteristics of Doffer:

Suitable for carding of 1.5D-20D*38-65mm artificial fiber. Single cylinder high-speed carding and double-doffer 

outputting has high production capacities. Cotton stripping has been used stripper bar,thecotton feeding roller is

controlled by frequency conversion.

http://textilehelpline.com/production-process-cotton-fiber/