Daily Archives: August 10, 2015

Metallic Yarns

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Metallic Yarn Manufacturing Process

Metallic yarns are by and large made from strips of a synthetic film, such as polyester, coated with metallic particles. In one more method, aluminum foil strips are sandwiched amid layers of film. Metallic yarns may also be made by twisting a strip of metal around a natural or man-made core yarn, producing a metal surface. It is made of thin film and supported by nylon or polyester or rayon yarn according to the type of yarn.

Metallic yarns start as rolls of films or laminations 30″ or wider. These wide rolls are slit into narrow rolls 2″ to 5″ wide. These narrow rolls are gang slit across their whole width to micro widths from 1/128″ (.0078″) and wider and then taken up on plastic spools for shipment to textile mills.

There is a rainbow of colors available from red, blue, green, etc. to gold and silver. Brilliant, reflective colors which add decorative patterns to fabrics.

Metallic Yarn Uses

Metallic yarns are woven, braided, and knit into many fashionable fabrics and trims. For added variety, metallic yarns are twisted with other fibers such as wool, nylon, cotton and synthetic blends to construct yarns which add novelty effects to the end cloth or trim. They create all textiles more eye-catching by adding sparkle.

At one time or another, metallic yarns have been used in just about every variety of textiles. Metallic Yarn is used in manufacturing knitting wears, knit & woven fabrics, embroideries, labels etc. Some end uses have been in automotive fabrics, television front fabrics, bath towels and face cloths, clerical vestments, bathing suits, hosiery, upholstery, hat bands, etc. Also in theatrical clothing, theater back drops, doll clothing, banners and uniforms.

Care of Fabrics with Metallic Yarns

Specialized dry cleaning with perchlorethylene is favored to laundering. Hand laundering with Woolite and cold water is the only suggested laundering method. Never launder with bleach. Fabrics containing metallic yarns should be treated like all synthetic fabrics. Ironing should be at the lowest setting on the iron. If there is no thermostat on the iron, do not use that iron. Do not use steam when ironing metallic yarns.

 

Metallic Yarn

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Understanding Tensile Tester

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Tensile tester is a machine that is used to measure ultimate tensile strength, elongation and reduction in the crossectional area of the material by subjecting it to axial force. The test is carried out to know how a material will react to different type of forces in the field so that weakness are pinpointed and necessary remedial measures are taken to prevent failure in manufactured goods.

A Universal Tensile testing machine, popularly known as UTM, is widely used by laboratories to test the tensile and compressive strength of the materials. The main purpose of this tensile tester is to establish maximum stretch limit of any material, before its breaks. It is used to test strength of various materials like rubber, plastic, steel etc, which are used in manufacture of different types of goods.

The Universal tensile testing machine helps to establish the ductility of metal. This property of metal allows it to retain its original shape after the load is removed, without any alteration. Through testing one can know the range of elongation and breaking point (point-of-no-return to original shape). Tensile strength testing machine helps manufacturers of industrial raw materials, semi-finished and finished goods get right information about the elongation, elastic limit, yield strength and yield point of their materials and avert any operational failure due to undetected weakness in the material. This machine ensures satisfactory compliance to industrial safety regulations and manufacturing practices.

The UTM has two crossheads, one is adjusted to accommodate the length of the specimen and the other one is hydraulically or electromagnetically driven to produce the tensile strain on the specimen. The machine generates enough force to fracture the specimen, in quick or slow way to mimic the action of force in actual field conditions.

Tensile tester measures minute change in dimensions to show exact behavior of the material under stress. This helps to build reliable testing report so that inherent weakness in the material are accounted and taken in consideration during the manufacturing process. Besides this tensile tester helps quality control engineers to ascertain the tensile breaking point or yield point of their finished goods before they are sent into the market. There are many types’ models of Universal tensile testing machine available in the market; however they generally have few common points that are mentioned below:

  • Anti-Backlash system
    • Electromagnetic or Hydraulic powered movement of one crosshead
    • Emergency stop through rocker, mechanical switch or computer
    • Crosshead guidance system
    • Quick disconnect load cell and fixture system

There are many suppliers of tensile testing machine in market and price of the tensile testers varies according to the technical features offered, models and the functionalities. It is in best interest of the user to thoroughly analyze the different models, their price and ascertain that how a said machine can benefit them in optimum manner.

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