Polyester

Background

CNC Parts, air, water, and petroleum. Developed in a 20th-century laboratory,CuBe2 Beryllium Copper Strip. In this reaction,CuBe2 Beryllium Copper.C17200 Beryllium Copper Strip.

Polyester is used in the manufacture of many products, including clothing, home furnishings,C17200 Beryllium Copper, computer and recording tapes, and electrical insulation.Beryllium Copper. It does not absorb moisture, but does absorb oil;CuSn6 Phosphor Bronze Strip-, soil-, and fire-C51900 Bronze Strip. Its low absorbency also makes it naturally resistant to stains.C51000 Bronze Strip,CuSn5 Phosphor Bronze Strip.C5100 Bronze Strip, and not damaged by mildew.C28000 Brass Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,H63 Brass Strip Coil-based E.I. du Pont de Nemours and Co.C27000 CuZn35 Brass. This early research, headed by W.H. Carothers,H65 Brass Strip Coil, 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,C26000 CuZn30 Brass Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.H80 Brass Strip Coil,C22000 CuZn10 Brass 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.C22000 Brass Strip, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Brass 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,C75200 Copper Nickel Zinc Strip. In this process, ethylene is the polymer, the chemical building block of polyester,C7701 C7521 Nickel Silver Strip.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Copper Nickel Zinc. The four basic forms are filament,Nickel Silver Strip, tow, and fiberfill. In the filament form,Nickel Plated Copper Strip, producing smooth-PCB Copper.Copper Clad, filaments are cut to short,Silver Onlay Brass Strip.Silver Onlay. 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 Clad Copper Strip.

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 Clad,Semi Tubular Brass Rivet, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Brass Tubular Rivet. 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.Solid Brass Rivet, which are usually round,Solid Copper Rivets. The number of holes in the spinneret determines the size of the yarn,Copper Rivet.
• 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,Silver Contact Points. 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,Electrical Contact Rivets.
• Silver Tungsten Electrical Contact,Moving Contact Rivets. Also,Cervical Secretion IGFBP-1 PROM Test Strip,Cervical Secretion IGFBP-1 PROM 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.

IGFBP-1 PROM Test

Urine FSH Menopause Test Device, 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,LH Ovulation Test. The rope-Serum HCG Pregnancy Test.

Drawing tow

• 1 Newly-Urine hCG Pregnancy Test Strip.Clip Cap.

Crimping

• 2 Drawn tow is then fed into compression boxes,Cotton Tip Applicators, at a rate of 9-15 crimps per inch (3-6 per cm).Capsicum Plaster.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Non-woven Surgical Tape.Silk Surgical Tape.

Cutting

• 4 Following heat setting,Weelchairs. 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)Analog Hearing Aid.Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Infra-red Ear Thermometer With Fever Alarm.

The Future

Infra-red Ear Thermometer With Switchable Dual Scale,Character Digital Thermometer's fastest-growing fiber.Digital Thermometer With Soft Tip. 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,Digital Thermometers, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Figertip Pulse Oximeter. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Medical Oxygen Concentrator, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.