How silk is made

We at ZAF BABY thought it was a good idea to let you know how silk dupion is made and how special it really is,  as a lot of our outfits & products  are made out of this exquisite fabric which is made in Japan. 

How Silk is Made

Silk - the most beautiful of all textile fibers is acclaimed as the queen of textiles. It comes from the cocoon of the silk worm and requires a great deal of handling and processing, which makes it one of the most expensive fibers also. Today China is the leading silk producer of the world. Other major silk producing countries include Japan, India and Italy.



Production of Silk
Characteristics of Silk
Identifying of Silk
Four Varieties of Natural Silk



The Silk Worm

 Production of Silk from Cocoon to Factory
Sericulture: The production of cocoon for their filament is called sericulture. The species Bombyx mori is usually cultivated and is raised under controlled condition of environment and nutrition. The life cycle of silk worm encircle in the four stages. The egg, the silk worm, the pupa and the moth. The silk worm which feeds on mulberry leaves forms a covering around it by secreting a protein like substance through its head.



This stage is called cocoon, the desirable stage for the silk producers.

Filature operations: The cocoons raised by the farmer are delivered to the factory, called a filature, where the silk is unwound from the cocoons and the strands are collected into skeins. Some cocoons are scientifically bred in such factories. The filature operations consist of the following stages.

a) Sorting cocoons : 
The cocoons are sorted according to the color, size, shape and texture as these affect the final quality of the silk. Cocoons may range from white and yellow to grayish.

b) Softening the Sericin : Silk filament is a double strand of fibrin, which is held together by a gummy substance called sericin or silk gum. After the cocoon has been sorted, they are put through a series of hot and cold immersions, as the sericin must be softened to permit the unwinding of the filament as one continuous thread.

c) Reeling the filament : Reeling is the process of unwinding the silk filaments from the cocoon and combining them together to make a thread of raw silk. As the filament of the cocoon is too fine for commercial use, three to ten strands are usually reeled at a time to produce the desired diameter of raw silk which is known as "reeled silk". The use able length of reeled filament is 300 to 600 m.

d) Bailing : The silk filament is reeled into skeins, which are packed in a small bundles called books, weighting 2 to 4.5 kg. These books are put into bales weighing about 60 kg. In this form raw silk is shipped to silk mills all over the world.

Characteristics of Silk

Silk is very strong in terms of tensile strength, meaning it can withstand a lot of pulling type pressure without breaking. This should not, however, be confused with wear ability or abrasion resistance. Silk will not stand up to the heavy wear that other fibers will.

Silk can take on many different appearances. A raw silk fabric may fool you into thinking that it is cotton or synthetic. The more refined the silk and the smaller the yarn, the more it resembles the look and feel that we know as silky.

Silk is a protein fiber like wool. This gives it many of its characteristics. It is sensitive to a range of chemical situations and cannot withstand prolonged exposure to either high alkalinity or to acid or oily soils. It will become brittle with age and exposure to sunlight.  

Identifying Silk

The burn test is the best way to be sure. Burning silk will leave a powdery ash and will extinguish itself when the flame is removed, just like wool. The easy way to tell silk and wool apart in the burn test is the smell. Where wool will have the smell of burning hair, the silk will have a much more disagreeable smell.


Four Varieties of Natural Silk

Out of the numerous species of silk moths, scientists have enumerated about 70 silk moths which are of some economic value. But of these only a very few have commercial value. The four commercially known varieties of natural silk are (1) Mulberry silk (2) Tasar silk (3) Muga silk and (4) Eri silk. Although the bulk of world silk supply comes from the silk moth Bombyx Mori which is domesticated, the other varieties of silk are known as wild silk, as they are grown in remote forest trees in natural conditions.

A wide range of silk fabrics are produced at different production centers   both Hand bloom and Power looms. A brief account of the range of fabrics is furnished below, as is known by its popular names.

Mulberry Varieties
Some important mulberry varieties are discussed below:
(a) Plain Silk Fabrics

A range of thin silk to deluxe qualities are produced in this category using filature. Fabrics ranging from 20 gm to 70 gm are produced in this category using both hand loom as well as power loom. The fabrics is available as per the requirements in different shades as well as in checks and stripes. Beautiful pin stripes are a specialty for shirting. Plain silk is mostly used by exporters for making ladies blouses, fashion garments, made-ups and scarves. Deluxe and super deluxe qualities are also produced as per specific orders.

(b) Silk Dupion

A specialty of Bangalore Hand looms, Dupion is the craze of the west. Produced out of twisted
ature warp and dupion weft is available in different quality ranges and shades. Dupion checks and stripes are elegant in look. Mainly used for dress material and cushion covers and furnishings, dupion is a popular name among the overseas silk importers.


We hope you have enjoyed the information on how silk is made.