Polyester

Background

C17200 Beryllium Copper, air, water, and petroleum. Developed in a 20th-century laboratory,Beryllium Copper. In this reaction,CuSn6 Phosphor Bronze Strip.C51900 Bronze Strip.

Polyester is used in the manufacture of many products, including clothing, home furnishings,C51000 Bronze Strip, computer and recording tapes, and electrical insulation.CuSn5 Phosphor Bronze Strip. It does not absorb moisture, but does absorb oil;C5100 Bronze Strip-, soil-, and fire-C28000 Brass Strip. Its low absorbency also makes it naturally resistant to stains.H63 Brass Strip Coil,C27000 CuZn35 Brass.H65 Brass Strip Coil, and not damaged by mildew.C26000 CuZn30 Brass Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,H80 Brass Strip Coil-based E.I. du Pont de Nemours and Co.C22000 CuZn10 Brass Strip. This early research, headed by W.H. Carothers,C22000 Brass 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,Brass Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.C75200 Copper Nickel Zinc Strip,C7701 C7521 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.Copper Nickel Zinc, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Nickel Silver Strip.

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,Nickel Plated Copper Strip. In this process, ethylene is the polymer, the chemical building block of polyester,PCB Copper.

The Manufacturing
Process

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

Drying

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

Winding

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

Urine hCG Pregnancy Test Strip

Clip Cap, 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,Cotton Tip Applicators. The rope-Capsicum Plaster.

Drawing tow

• 1 Newly-Non-woven Surgical Tape.Silk Surgical Tape.

Crimping

• 2 Drawn tow is then fed into compression boxes,Weelchairs, at a rate of 9-15 crimps per inch (3-6 per cm).Analog Hearing Aid.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function.Infra-red Ear Thermometer With Fever Alarm.

Cutting

• 4 Following heat setting,Infra-red Ear Thermometer With Switchable Dual Scale. 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)Character Digital Thermometer.Digital Thermometer With Soft Tip, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Digital Thermometers.

The Future

Figertip Pulse Oximeter,Medical Oxygen Concentrator's fastest-growing fiber.Neoprene Rubber O Rings. 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,Yellow Modified PTFE Gasket Sheet with silica filled, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Type D Flange Insulation Gasket. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Fluorine 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.