Polyester

Background

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

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

History

In 1926,C51900 Bronze Strip-based E.I. du Pont de Nemours and Co.C51000 Bronze Strip. This early research, headed by W.H. Carothers,CuSn5 Phosphor 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,C5100 Bronze Strip. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.C28000 Brass Strip,H63 Brass Strip Coil. 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.C27000 CuZn35 Brass, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.H65 Brass Strip Coil.

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,C26000 CuZn30 Brass Strip. In this process, ethylene is the polymer, the chemical building block of polyester,H80 Brass Strip Coil.

The Manufacturing
Process

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

Drying

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

Winding

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

Electrical Contact Rivets

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

Drawing tow

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

Crimping

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

Setting

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

Cutting

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

The Future

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