Polyester

Background

silver points, air, water, and petroleum. Developed in a 20th-century laboratory,Steel rivets. In this reaction,Aluminum rivets.copper rivets.

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

History

In 1926,CuSn6 Phosphor Bronze Strip-based E.I. du Pont de Nemours and Co.C51900 Bronze Strip. This early research, headed by W.H. Carothers,C51000 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,CuSn5 Phosphor Bronze Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.C5100 Bronze Strip,C28000 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.H63 Brass Strip Coil, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.C27000 CuZn35 Brass.

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,H65 Brass Strip Coil. In this process, ethylene is the polymer, the chemical building block of polyester,C26000 CuZn30 Brass Strip.

The Manufacturing
Process

Polyester is manufactured by one of several methods.H80 Brass Strip Coil. The four basic forms are filament,C22000 CuZn10 Brass Strip, tow, and fiberfill. In the filament form,C22000 Brass Strip, producing smooth-Brass Strip.C75200 Copper Nickel Zinc Strip, filaments are cut to short,C7701 C7521 Nickel Silver Strip.Copper Nickel Zinc. 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.Nickel Silver 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-Nickel Plated Copper Strip,PCB Copper, is extruded through a slot to form long ribbons.

Drying

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

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 Contact Points

Electrical 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,Silver Tungsten Electrical Contact. The rope-Moving Contact Rivets.

Drawing tow

• 1 Newly-Cervical Secretion IGFBP-1 PROM Test Strip.Cervical Secretion IGFBP-1 PROM Test.

Crimping

• 2 Drawn tow is then fed into compression boxes,IGFBP-1 PROM Test, at a rate of 9-15 crimps per inch (3-6 per cm).Urine FSH Menopause Test Device.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)LH Ovulation Test.Serum HCG Pregnancy Test.

Cutting

• 4 Following heat setting,Urine hCG Pregnancy Test Strip. 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)Clip Cap.Cotton Tip Applicators, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Capsicum Plaster.

The Future

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