Polyester

Background

C51000 Bronze Strip, air, water, and petroleum. Developed in a 20th-century laboratory,CuSn5 Phosphor Bronze Strip. In this reaction,C5100 Bronze Strip.C28000 Brass Strip.

Polyester is used in the manufacture of many products, including clothing, home furnishings,H63 Brass Strip Coil, computer and recording tapes, and electrical insulation.C27000 CuZn35 Brass. It does not absorb moisture, but does absorb oil;H65 Brass Strip Coil-, soil-, and fire-C26000 CuZn30 Brass Strip. Its low absorbency also makes it naturally resistant to stains.H80 Brass Strip Coil,C22000 CuZn10 Brass Strip.C22000 Brass Strip, and not damaged by mildew.Brass Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

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

The Manufacturing
Process

Polyester is manufactured by one of several methods.Silver Clad. The four basic forms are filament,Semi Tubular Brass Rivet, tow, and fiberfill. In the filament form,Brass Tubular Rivet, producing smooth-Solid Brass Rivet.Solid Copper Rivets, filaments are cut to short,Copper Rivet.Silver Contact Points. 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.Electrical Contact Rivets.

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 Tungsten Electrical Contact,Moving Contact Rivets, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Cervical Secretion IGFBP-1 PROM Test 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.Cervical Secretion IGFBP-1 PROM Test, which are usually round,IGFBP-1 PROM Test. The number of holes in the spinneret determines the size of the yarn,Urine FSH Menopause Test Device.
• 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,LH Ovulation Test. 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,Serum HCG Pregnancy Test.
• Urine hCG Pregnancy Test Strip,Clip Cap. Also,Cotton Tip Applicators,Capsicum Plaster.

Winding

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

Non-woven Surgical Tape

Silk Surgical Tape, 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,Weelchairs. The rope-Analog Hearing Aid.

Drawing tow

• 1 Newly-Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function.Infra-red Ear Thermometer With Fever Alarm.

Crimping

• 2 Drawn tow is then fed into compression boxes,Infra-red Ear Thermometer With Switchable Dual Scale, at a rate of 9-15 crimps per inch (3-6 per cm).Character Digital Thermometer.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Digital Thermometer With Soft Tip.Digital Thermometers.

Cutting

• 4 Following heat setting,Figertip Pulse Oximeter. 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)Medical Oxygen Concentrator.Neoprene Rubber O Rings, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Yellow Modified PTFE Gasket Sheet with silica filled.

The Future

Type D Flange Insulation Gasket,Fluorine Rubber Gaskets's fastest-growing fiber.Styrene-Butadiene Rubber Gaskets. 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,Nitrile Rubber Gaskets, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Asbestos Gasket Sheet. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.flange Isolation gasket kits, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.