Polyester

Background

C51900 Bronze Strip, air, water, and petroleum. Developed in a 20th-century laboratory,C51000 Bronze Strip. In this reaction,CuSn5 Phosphor Bronze Strip.C5100 Bronze Strip.

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

History

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

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

The Manufacturing
Process

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

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

Drying

• 3 After the polyester emerges from polymerization,Moving Contact Rivets. 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.Cervical Secretion IGFBP-1 PROM Test Strip, which are usually round,Cervical Secretion IGFBP-1 PROM Test. The number of holes in the spinneret determines the size of the yarn,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,Urine FSH Menopause Test Device. 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,LH Ovulation Test.
• Serum HCG Pregnancy Test,Urine hCG Pregnancy Test Strip. Also,Clip Cap,Cotton Tip Applicators.

Winding

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

Capsicum Plaster

Non-woven Surgical Tape, 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,Silk Surgical Tape. The rope-Weelchairs.

Drawing tow

• 1 Newly-Analog Hearing Aid.Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function.

Crimping

• 2 Drawn tow is then fed into compression boxes,Infra-red Ear Thermometer With Fever Alarm, at a rate of 9-15 crimps per inch (3-6 per cm).Infra-red Ear Thermometer With Switchable Dual Scale.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Character Digital Thermometer.Digital Thermometer With Soft Tip.

Cutting

• 4 Following heat setting,Digital Thermometers. 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)Figertip Pulse Oximeter.Medical Oxygen Concentrator, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Neoprene Rubber O Rings.

The Future

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