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Monday, 12 October 2020

Tensile loading | Elastic and Plastic deformation.

Elastic and plastic behaviour during tensile loading: when the material is subjected to the tensile force, initially material shows some elastic behaviour where it goes back to the original position upon removal of the force. The successive loading causes the plastic deformation where material cannot revert to the exact original position. And further loading finally causes fractures.

Tensile loading: Elastic and Plastic deformation.

Actually, the regions found under tensile loading are as follows-

  1. Elastic region in which original size and shape will be restored after release of load.
  2. Region of permanent deformation but without localized necking.
  3. Region of permanent deformation with localized necking prior to fracture.

Sunday, 11 October 2020

Geometry of Yarn

1. Yarn cross-section is circular. 
2. The fibres follow the helical curves on the nested concentric cylinder. 
3. The fibre on the yarn axis is straight, or linear, and the Helix angle and Helix diameter of the fibres increase as they move away from the yarn axis and reach the maximum value on the yarn surface. 
4. Twist along the yarn remains constant in all yarn layers. 
5. The packing density of the fibres in the yarn structure is constant everywhere. 
6. Yarn cross-section consists of a large number of fibres. 

Yarn Geometry | Texpedia

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

Friday, 9 October 2020

Sample | Sampling | Types of garment sample

Sample: A few items or goods taken from a large number of similar goods are called sample. Or The true representative of the bulk or population is termed as a sample and the process of selecting a sample is called the sampling process. Sampling for textile testing can be in-
  • Fibre stage 
  • Yarn stage 
  • Fabric stage 
  • Garment stage 
Sampling: Garment Sampling is the most technical feature of the merchandiser’s job. This involves developing new products or taking some existing products to the new customer to meet customer demands. Merchandisers usually develop different samples and send to the customer for approval. 

Types of garment sample? 
Prototype samples: These are samples developed during the preliminary stages of product development. They are made by similar but not always exact fabrics & trims. But must be made as per buyer sketch, specification sheet. 

Sample | Sampling | Types of garment sample

Thursday, 8 October 2020

Garment Merchandising | Sampling Processes

Sampling is the most technical feature of the merchandiser’s job. This involves developing new products or taking some existing products to the new customer to meet customer demands.

Garment Merchandising | Garments Sampling Processes | Texpedi.com

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...