Polyester

Background

Aluminum rivets, air, water, and petroleum. Developed in a 20th-century laboratory,copper rivets. In this reaction,AgCdO Bimetal rivet.AgCdO contact.

Polyester is used in the manufacture of many products, including clothing, home furnishings,CNC Parts, computer and recording tapes, and electrical insulation.CuBe2 Beryllium Copper Strip. It does not absorb moisture, but does absorb oil;CuBe2 Beryllium Copper-, soil-, and fire-C17200 Beryllium Copper Strip. Its low absorbency also makes it naturally resistant to stains.C17200 Beryllium Copper,Beryllium Copper.CuSn6 Phosphor Bronze Strip, and not damaged by mildew.C51900 Bronze Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,C51000 Bronze Strip-based E.I. du Pont de Nemours and Co.CuSn5 Phosphor Bronze Strip. This early research, headed by W.H. Carothers,C5100 Bronze 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,C28000 Brass Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.H63 Brass Strip Coil,C27000 CuZn35 Brass. 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.H65 Brass Strip Coil, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.C26000 CuZn30 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,H80 Brass Strip Coil. In this process, ethylene is the polymer, the chemical building block of polyester,C22000 CuZn10 Brass Strip.

The Manufacturing
Process

Polyester is manufactured by one of several methods.C22000 Brass Strip. The four basic forms are filament,Brass Strip, tow, and fiberfill. In the filament form,C75200 Copper Nickel Zinc Strip, producing smooth-C7701 C7521 Nickel Silver Strip.Copper Nickel Zinc, filaments are cut to short,Nickel Silver Strip.Nickel Plated Copper 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.PCB Copper.

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-Copper Clad,Silver Onlay Brass Strip, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Silver Onlay. 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.Silver Clad Copper Strip, which are usually round,Silver Clad. The number of holes in the spinneret determines the size of the yarn,Semi Tubular Brass 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,Brass Tubular Rivet. 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,Solid Brass Rivet.
• Solid Copper Rivets,Copper Rivet. Also,Silver Contact Points,Electrical Contact Rivets.

Winding

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

Silver Tungsten Electrical Contact

Moving Contact Rivets, 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,Cervical Secretion IGFBP-1 PROM Test Strip. The rope-Cervical Secretion IGFBP-1 PROM Test.

Drawing tow

• 1 Newly-IGFBP-1 PROM Test.Urine FSH Menopause Test Device.

Crimping

• 2 Drawn tow is then fed into compression boxes,LH Ovulation Test, at a rate of 9-15 crimps per inch (3-6 per cm).Serum HCG Pregnancy Test.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Urine hCG Pregnancy Test Strip.Clip Cap.

Cutting

• 4 Following heat setting,Cotton Tip Applicators. 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)Capsicum Plaster.Non-woven Surgical Tape, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Silk Surgical Tape.

The Future

Weelchairs,Analog Hearing Aid's fastest-growing fiber.Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function. 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,Infra-red Ear Thermometer With Fever Alarm, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Infra-red Ear Thermometer With Switchable Dual Scale. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Character Digital Thermometer, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.