Polyester

Background

Split Embossed Leather Labor Insurance Shoes, air, water, and petroleum. Developed in a 20th-century laboratory,PU Mid Cut Labor Insurance Shoes. In this reaction,Embossed Leather Labor Insurance Shoes.PU Low Cut Labor Insurance Shoes.

Polyester is used in the manufacture of many products, including clothing, home furnishings,PU Low Cut Suede Leather Army Shoes, computer and recording tapes, and electrical insulation.RUBBER High Cut Army Shoes. It does not absorb moisture, but does absorb oil;PU And RUBBER Army Shoes-, soil-, and fire-PU Mid Cut Army Safety Shoes. Its low absorbency also makes it naturally resistant to stains.RUBBER Mid Cut Army Shoes,Army Shoes.KPU Low Cut Safety Shoes, and not damaged by mildew.PU Low Cut Suede Leather Safety Shoes, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Antistatic protective Safety Shoes-based E.I. du Pont de Nemours and Co.PU And RUBBER Leather Low Cut Safety Shoes. This early research, headed by W.H. Carothers,PU Low Cut Split Embossed Leather Safety Shoes, the first synthetic fiber. Soon after, in the years 1939-41, British research chemists took interest in the du Pont studies and conducted their own research in the laboratories of Calico Printers Association, Ltd. This work resulted in the creation of the polyester fiber known in England as Terylene.

In 1946,Leather Surface PU Safety Shoes. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Textile Surface PU bottom Safety Shoes,PU Safety Shoes. Today, there are two primary types of polyester, PET (polyethylene terephthalate) and PCDT (poly-1, 4-cyclohexylene-dimethylene terephthalate). PET, the more popular type, is applicable to a wider variety of uses.PU Low Cut Safety Shoes, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Textile Surface PU Bottom Safety Shoes.

Raw Materials

Polyester is a chemical term which can be broken intopoly,meaning many, andester,a basic organic chemical compound. The principle ingredient used in the manufacture of polyester is ethylene,PU Textile Safety Shoes. In this process, ethylene is the polymer, the chemical building block of polyester,Waterproof PU Low Cut Safety Shoes.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Split Embossed Leather Sandal Safety Shoes. The four basic forms are filament,Low Cut Microfiber Safety Shoes, tow, and fiberfill. In the filament form,Microfiber PU Low Cut Safety Shoes, producing smooth-Split Embossed Leather PU Boots Safety Shoes.PU High Cut Safety Shoes, filaments are cut to short,PU Mid Cut Hiking Safety Shoes.Hiking Safety Shoes. Tow is a form in which continuous filaments are drawn loosely together. Fiberfill is the voluminous form used in the manufacture of quilts, pillows, and outerwear.Leather PVC Bottom Safety Shoes.

Manufacturing Filament Yarn

Polymerization

• 1 To form polyester, dimethyl terephthalate is first reacted with ethylene glycol in the presence of a catalyst at a temperature of 302-410°F (150-210°C).
• 2 The resulting chemical, a monomer (single, non-repeating molecule) alcohol, is combined with terephthalic acid and raised to a temperature of 472°F (280°C). Newly-PU And RUBBER Low Cut Safety Shoes,Embossed Leather Safety Shoes, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Low Cut Textile Surface Safety Shoes. The material is cut into tiny chips and completely dried to prevent irregularities in consistency.

Melt spinning

• 4 Polymer chips are melted at 500-518°F (260-270°C) to form a syrup-like solution.PU Low Cut Textile Safety Shoes, which are usually round,Shockproof And Wearable Safety Shoes. The number of holes in the spinneret determines the size of the yarn,RUBBER Low Cut Textile Surface Safety Shoes.
• 5 At the spinning stage, other chemicals may be added to the solution to make the resulting material flame retardant, antistatic, or easier to dye.

Drawing the fiber

• 6 When polyester emerges from the spinneret,Leather PU Bottom Safety Shoes. The stretching forces the random polyester molecules to align in a parallel formation. This increases the strength, tenacity, and resilience of the fiber. This time, when the filaments dry,Waterproof Leather Safety Shoes.
• Suede Leather Safety Shoes,Split Embossed Leather Safety Shoes. Also,RUBBER Low Cut Safety Shoes,Offset Print  Low Cut Safety Shoes.

Winding

• 8 After the polyester yarn is drawn, it is wound on large bobbins or flat-wound packages, ready to be woven into material.

PVC Mid Cut Safety Shoes

KF12 Tungsten Steel Round Bar, polymerization, drying, and melt spinning (steps 1-4 above) are much the same as in the manufacture of filament yarn. However, in the melt spinning process,Tungsten Steel A Punch. The rope-PG Punch.

Drawing tow

• 1 Newly-ASP-23 Forming Punch.High-speed Steel Titanium-plated Punch.

Crimping

• 2 Drawn tow is then fed into compression boxes,Non-standard Tapping Punch, at a rate of 9-15 crimps per inch (3-6 per cm).KD20 Tungsten Steel Punch.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)CD650 Tungsten Steel Punch Needle.KR446 Tungsten Steel T Punch.

Cutting

• 4 Following heat setting,WF15 Tungsten Steel Thimble. Polyester that will be blended with cotton is cut in 1.25-1.50 inch (3.2-3.8 cm) pieces; for rayon blends, 2 inch (5 cm)MC20 Tungsten Steel Notch Punch.RD50 Tungsten Steel Flat Needle, such ascarpet,polyester filaments are cut into 6 inch (15 cm)KG7 Tungsten Steel Insert.

The Future

SKD61 Division Tube,Tungsten Steel Notch Punch's fastest-growing fiber.Son And Mother Punch. However, polyester has suffered an "image problem" since that time, and clothes made out of polyester were often devalued and even ridiculed. Several new forms of polyester introduced in the early 1990s may help revitalize the image of polyester. A new form of polyester fiber,Pulling Teeth And Punching Needles, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,SKD61 Division Needle. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.PG Optical Grinding Processing, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.