Scroop is a term used commonly as a finish with synthetic fibers and silk.
In case of silk scroop is the crunchy feel as well as rustly sound that is produced in the fiber on use. Scroop is like the feeling of squeezing a big bag of corn starch or stepping down into a very powdery snow.
Scroop is not an inherent property of silk.
Scroop can be induced in silk in two ways:
One way is to leave the gum of the silk (sericin) behind and not remove it. Sericin has a high coefficient of friction and hence resists the easy sliding of fibers one over the other. Vibrations created by friction produce the sound.
The other way is by treating silk with organic acid such as formic, lactic, citric or acetic acid in a concentration of 2-4 ml/l and drying without washing.
In case of synthetic fibers, cohesive agents are used to increase the fiber-to-fiber friction. However, it will increase a property called scroop. The attribute is so named, because of the sound that the staple bundle makes when it is squeezed. It is caused by resistance to the fiber movement that results from the increase in friction between the fibers. If a fabric is made from a yarn having high scroop level- a harsh handle is produced.
Reference: This is an amazing reading on silk by MIT
* By the way - Unrelated to the post- Cashmilon is made of acrylic and not nylon.
* By the way - Unrelated to the post- Cashmilon is made of acrylic and not nylon.
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