The invention refers to a process for dyeing an article obtained with a protein fiber, capable of giving the final product a denim- type visual appearance, without however contemplating printing or dyeing of the warp or weft yarn.
The Process of Realization
The process is characterized by a treatment of partial resistance to dyeing of the article such that the resulting article can be dyed with dyes commonly used for protein fibres, assuming the characteristic appearance of denim garments.
The "standard" dyeing process of a textile material generally takes place through the passage of a dye from a dye bath onto the fiber or fabric to be dyed.
The commonly used dyeing processes are the so-called "yarn" dyeing process and the so-called "fabric" process.
Among the garments made with yarn dyeing, denim fabric (and the consequent denim effect) is one of the best known and used products all over the world, especially in the characteristic blue shade.
To date, the denim effect is generally obtained using yarn-dyed cotton fibers, or by printing steps on a two-dimensional product (piece).
The innovative patent includes a process for obtaining a denim effect in fabric without resorting to warp or weft printing or dyeing, commonly used in traditional processes.
The patent concerns protein fibers and in particular wool, including mixed fibres: angora, merinos, cashmere, alpaca, vicuna, camel, silk and/or their blends with other fibres.
It can be applied both on carded and worsted fabric, obtaining excellent results in terms of denim effect and fastness to light, rubbing and water. The procedure is applied to both fabric and non-woven fabric.