Polyester

Background

H63 Brass Strip Coil, air, water, and petroleum. Developed in a 20th-century laboratory,C27000 CuZn35 Brass. In this reaction,H65 Brass Strip Coil.C26000 CuZn30 Brass Strip.

Polyester is used in the manufacture of many products, including clothing, home furnishings,H80 Brass Strip Coil, computer and recording tapes, and electrical insulation.C22000 CuZn10 Brass Strip. It does not absorb moisture, but does absorb oil;C22000 Brass Strip-, soil-, and fire-Brass Strip. Its low absorbency also makes it naturally resistant to stains.C75200 Copper Nickel Zinc Strip,C7701 C7521 Nickel Silver Strip.Copper Nickel Zinc, and not damaged by mildew.Nickel Silver Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Nickel Plated Copper Strip-based E.I. du Pont de Nemours and Co.PCB Copper. This early research, headed by W.H. Carothers,Copper Clad, 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,Silver Onlay Brass Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Silver Onlay,Silver Clad Copper Strip. 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.Silver Clad, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Semi Tubular Brass Rivet.

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,Brass Tubular Rivet. In this process, ethylene is the polymer, the chemical building block of polyester,Solid Brass Rivet.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Solid Copper Rivets. The four basic forms are filament,Copper Rivet, tow, and fiberfill. In the filament form,Silver Contact Points, producing smooth-Electrical Contact Rivets.Silver Tungsten Electrical Contact, filaments are cut to short,Moving Contact Rivets.Cervical Secretion IGFBP-1 PROM Test Strip. 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.Cervical Secretion IGFBP-1 PROM Test.

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-IGFBP-1 PROM Test,Urine FSH Menopause Test Device, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,LH Ovulation Test. 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.Serum HCG Pregnancy Test, which are usually round,Urine hCG Pregnancy Test Strip. The number of holes in the spinneret determines the size of the yarn,Clip Cap.
• 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,Cotton Tip Applicators. 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,Capsicum Plaster.
• Non-woven Surgical Tape,Silk Surgical Tape. Also,Weelchairs,Analog Hearing Aid.

Winding

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

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Infra-red Ear Thermometer With Fever Alarm, 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,Infra-red Ear Thermometer With Switchable Dual Scale. The rope-Character Digital Thermometer.

Drawing tow

• 1 Newly-Digital Thermometer With Soft Tip.Digital Thermometers.

Crimping

• 2 Drawn tow is then fed into compression boxes,Figertip Pulse Oximeter, at a rate of 9-15 crimps per inch (3-6 per cm).Medical Oxygen Concentrator.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Neoprene Rubber O Rings.Yellow Modified PTFE Gasket Sheet with silica filled.

Cutting

• 4 Following heat setting,Type D Flange Insulation Gasket. 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)Fluorine Rubber Gaskets.Styrene-Butadiene Rubber Gaskets, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Nitrile Rubber Gaskets.

The Future

Asbestos Gasket Sheet,flange Isolation gasket kits's fastest-growing fiber.Insulating Flange Kits. 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,Flange Insulation Kit Distributor, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Flange Insulation Gasket Kit. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Corrugated Graphite Tapes, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.