Polyester

Background

High Speed Door, air, water, and petroleum. Developed in a 20th-century laboratory,RUBBER Low Cut Labor Insurance Shoes. In this reaction,PU And RUBBER Low Cut Labor Insurance Shoes.PU And RUBBER High Cut Labor Insurance Shoes.

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

History

In 1926,RUBBER Mid Cut Army Shoes-based E.I. du Pont de Nemours and Co.Army Shoes. This early research, headed by W.H. Carothers,KPU Low Cut 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,PU Low Cut Suede Leather Safety Shoes. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Antistatic protective Safety Shoes,PU And RUBBER Leather Low Cut 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 Split Embossed Leather Safety Shoes, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Leather Surface PU 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,Textile Surface PU bottom Safety Shoes. In this process, ethylene is the polymer, the chemical building block of polyester,PU Safety Shoes.

The Manufacturing
Process

Polyester is manufactured by one of several methods.PU Low Cut Safety Shoes. The four basic forms are filament,Textile Surface PU Bottom Safety Shoes, tow, and fiberfill. In the filament form,PU Textile Safety Shoes, producing smooth-Waterproof PU Low Cut Safety Shoes.Split Embossed Leather Sandal Safety Shoes, filaments are cut to short,Low Cut Microfiber Safety Shoes.Microfiber PU Low Cut 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.Split Embossed Leather PU Boots 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 High Cut Safety Shoes,PU Mid Cut Hiking Safety Shoes, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Hiking 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.Leather PVC Bottom Safety Shoes, which are usually round,PU And RUBBER Low Cut Safety Shoes. The number of holes in the spinneret determines the size of the yarn,Embossed Leather 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,Low Cut Textile Surface 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,PU Low Cut Textile Safety Shoes.
• Shockproof And Wearable Safety Shoes,RUBBER Low Cut Textile Surface Safety Shoes. Also,Leather PU Bottom Safety Shoes,Waterproof Leather 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.

Suede Leather Safety Shoes

Split Embossed Leather Safety Shoes, 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,RUBBER Low Cut Safety Shoes. The rope-Offset Print  Low Cut Safety Shoes.

Drawing tow

• 1 Newly-PVC Mid Cut Safety Shoes.KF12 Tungsten Steel Round Bar.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)ASP-23 Forming Punch.High-speed Steel Titanium-plated Punch.

Cutting

• 4 Following heat setting,Non-standard Tapping Punch. 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)KD20 Tungsten Steel Punch.CD650 Tungsten Steel Punch Needle, such ascarpet,polyester filaments are cut into 6 inch (15 cm)KR446 Tungsten Steel T Punch.

The Future

WF15 Tungsten Steel Thimble,MC20 Tungsten Steel Notch Punch's fastest-growing fiber.RD50 Tungsten Steel Flat Needle. 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,KG7 Tungsten Steel Insert, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,SKD61 Division Tube. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Tungsten Steel Notch Punch, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.