Polyester

Background

CuSn6 Phosphor Bronze Strip, air, water, and petroleum. Developed in a 20th-century laboratory,C51900 Bronze Strip. In this reaction,C51000 Bronze Strip.CuSn5 Phosphor Bronze Strip.

Polyester is used in the manufacture of many products, including clothing, home furnishings,C5100 Bronze Strip, computer and recording tapes, and electrical insulation.C28000 Brass Strip. It does not absorb moisture, but does absorb oil;H63 Brass Strip Coil-, soil-, and fire-C27000 CuZn35 Brass. Its low absorbency also makes it naturally resistant to stains.H65 Brass Strip Coil,C26000 CuZn30 Brass Strip.H80 Brass Strip Coil, and not damaged by mildew.C22000 CuZn10 Brass Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,C22000 Brass Strip-based E.I. du Pont de Nemours and Co.Brass Strip. This early research, headed by W.H. Carothers,C75200 Copper Nickel Zinc Strip, 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,C7701 C7521 Nickel Silver Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Copper Nickel Zinc,Nickel Silver 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.Nickel Plated Copper Strip, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.PCB Copper.

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,Copper Clad. In this process, ethylene is the polymer, the chemical building block of polyester,Silver Onlay Brass Strip.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Silver Onlay. The four basic forms are filament,Silver Clad Copper Strip, tow, and fiberfill. In the filament form,Silver Clad, producing smooth-Semi Tubular Brass Rivet.Brass Tubular Rivet, filaments are cut to short,Solid Brass Rivet.Solid Copper Rivets. 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.Copper Rivet.

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-Silver Contact Points,Electrical Contact Rivets, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Silver Tungsten Electrical Contact. 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.Moving Contact Rivets, which are usually round,Cervical Secretion IGFBP-1 PROM Test Strip. The number of holes in the spinneret determines the size of the yarn,Cervical Secretion IGFBP-1 PROM Test.
• 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,IGFBP-1 PROM Test. 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,Urine FSH Menopause Test Device.
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Winding

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

Cotton Tip Applicators

Capsicum Plaster, 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,Non-woven Surgical Tape. The rope-Silk Surgical Tape.

Drawing tow

• 1 Newly-Weelchairs.Analog Hearing Aid.

Crimping

• 2 Drawn tow is then fed into compression boxes,Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function, at a rate of 9-15 crimps per inch (3-6 per cm).Infra-red Ear Thermometer With Fever Alarm.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Infra-red Ear Thermometer With Switchable Dual Scale.Character Digital Thermometer.

Cutting

• 4 Following heat setting,Digital Thermometer With Soft Tip. 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)Digital Thermometers.Figertip Pulse Oximeter, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Medical Oxygen Concentrator.

The Future

Neoprene Rubber O Rings,Yellow Modified PTFE Gasket Sheet with silica filled's fastest-growing fiber.Type D Flange Insulation Gasket. 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,Fluorine Rubber Gaskets, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Styrene-Butadiene Rubber Gaskets. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Nitrile Rubber Gaskets, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.