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Showing posts with label Dyeing. Show all posts
Showing posts with label Dyeing. Show all posts

Friday, 16 October 2020

Important Dyeing Terms & Definitions

👉Adsorption 
Dye molecules when come to the contact of the textile fibre. Dyes do not penetrate into fibres rather stay on the surfaces of textile materials.

Important Dyeing Terms & Definitions | Texpedi.com

Saturday, 10 October 2020

Yarn Dyeing | Yarn Dyeing Flow Chart

Emdadul Haq
Lecturer, Department of Textile Engineering, Primeasia University; Bangladesh

Dyeing is the application of dyes or pigments on textile materials such as fibres, yarns, and fabrics with the goal of achieving colour with desired colour fastness. Dyeing is normally done in a special solution containing dyes and particular chemical material. Dye molecules are fixed to the fibre by absorption, diffusion, or bonding with temperature and time being key controlling factors. The bond between dye molecule and fibre may be strong or weak, depending on the dye used. Dyeing and printing are different applications; in printing, colour is applied to a localised area with desired patterns. In dyeing, it is applied to the entire textile.

Yarn Dyeing | Texpedi.com

Monday, 5 October 2020

Affinity | Substantivity | Colour Yield | Liquor-to-goods ratio

Affinity: is the attraction of dye to the fibre at normal condition of dye bath. It defines the quality of the dye. Affinity of a dye does not depend on any external factors such temperature, M:L, type of fibre or concentration of electrolyte etc. Initial absorption of dyes due to affinity is called the color strike.

Substantivity: is the attraction of dyes to fibre at changed condition or precise condition. Substantivity of a dye depends on various external factors such temperature, M:L, type of fibre or concentration of electrolyte etc. It is the tendency of a dye to move from a solution into fibres during dyeing condition.

Affinity | Substantivity | Colour Yield | Liquor-to-goods ratio

Saturday, 3 October 2020

Knit Fabric Dyeing Process Parameter

Emdadul Haq 
Lecturer, Department of Textile Engineering, Primeasia University; Bangladesh 

Dyeing is a process of coloration of textile fabric by using some required dyes & chemical according to the specified shade, color & order. Dyeing is the aqueous application of dyes on textile substrate. Dyes can be absorbed or adhere on to the substrate in solution form through covalent bond or complexes with salts or metals by chemical retention or physical adsorption. Dyes are of different types & applied to different fabrics like natural or synthetic in different methods. Reactive dyes are most common for cotton fabric dyeing, disperse dyes are widely used for polyester fabric dyeing in the industry & pigments are also used for cotton & CVC fabric dyeing. During dyeing operation, many dyeing parameters such as time, temperature, pH etc. are affected on whole dyeing process.

Knit dyeing process parameter

Monday, 11 May 2020

Lab Dip & Yarn Dip

Vendors get colour standards for all the colours mentioned in the purchase order (PO). Getting colour standards from customers' end may be in two forms as (1) physical colour swatch or (2) phantom number. Next, merchandisers have to make the colours developed by the dyeing unit and send it to the customer for shade approval to proceed on the subsequent processes. The colour development can be either in yarn form or in fabric form. 

Yarn form/Yarn dip: If yarn dyeing is required for the order, not fabric solid dyeing, in that case, colours should be developed in yarn form and it is called yarn dip. Yarn dip with more than 3 options is sent to the customer for approval. 

Fabric form/Lab dip: IF the order requires fabric solid dyeing, then colours should be developed in fabric form and it is termed as Lab dip. Likewise, the yarn dip, more than 3 options are sent to the customer for shade approval. Next, with the approved shade recipe, bulk dyeing will be accomplished. 

Manufacturing & Service Operations | Functions of Supply Chain

Supply Chain A  supply chain  is a network of individual functions within an organization that begins with the development of a stra...