Polyester

Background

C27000 CuZn35 Brass, air, water, and petroleum. Developed in a 20th-century laboratory,H65 Brass Strip Coil. In this reaction,C26000 CuZn30 Brass Strip.H80 Brass Strip Coil.

Polyester is used in the manufacture of many products, including clothing, home furnishings,C22000 CuZn10 Brass Strip, computer and recording tapes, and electrical insulation.C22000 Brass Strip. It does not absorb moisture, but does absorb oil;Brass Strip-, soil-, and fire-C75200 Copper Nickel Zinc Strip. Its low absorbency also makes it naturally resistant to stains.C7701 C7521 Nickel Silver Strip,Copper Nickel Zinc.Nickel Silver Strip, and not damaged by mildew.Nickel Plated Copper Strip, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,PCB Copper-based E.I. du Pont de Nemours and Co.Copper Clad. This early research, headed by W.H. Carothers,Silver Onlay Brass 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,Silver Onlay. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Silver Clad Copper Strip,Silver Clad. 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.Semi Tubular Brass Rivet, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Brass Tubular Rivet.

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,Solid Brass Rivet. In this process, ethylene is the polymer, the chemical building block of polyester,Solid Copper Rivets.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Copper Rivet. The four basic forms are filament,Silver Contact Points, tow, and fiberfill. In the filament form,Electrical Contact Rivets, producing smooth-Silver Tungsten Electrical Contact.Moving Contact Rivets, filaments are cut to short,Cervical Secretion IGFBP-1 PROM Test Strip.Cervical Secretion IGFBP-1 PROM Test. 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.IGFBP-1 PROM Test.

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-Urine FSH Menopause Test Device,LH Ovulation Test, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Serum HCG Pregnancy Test. 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.Urine hCG Pregnancy Test Strip, which are usually round,Clip Cap. The number of holes in the spinneret determines the size of the yarn,Cotton Tip Applicators.
• 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,Capsicum Plaster. 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,Non-woven Surgical Tape.
• Silk Surgical Tape,Weelchairs. Also,Analog Hearing Aid,Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function.

Winding

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

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Infra-red Ear Thermometer With Switchable Dual Scale, 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,Character Digital Thermometer. The rope-Digital Thermometer With Soft Tip.

Drawing tow

• 1 Newly-Digital Thermometers.Figertip Pulse Oximeter.

Crimping

• 2 Drawn tow is then fed into compression boxes,Medical Oxygen Concentrator, at a rate of 9-15 crimps per inch (3-6 per cm).Neoprene Rubber O Rings.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Yellow Modified PTFE Gasket Sheet with silica filled.Type D Flange Insulation Gasket.

Cutting

• 4 Following heat setting,Fluorine Rubber Gaskets. 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)Styrene-Butadiene Rubber Gaskets.Nitrile Rubber Gaskets, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Asbestos Gasket Sheet.

The Future

flange Isolation gasket kits,Insulating Flange Kits's fastest-growing fiber.Flange Insulation Kit Distributor. 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,Flange Insulation Gasket Kit, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Corrugated Graphite Tapes. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Expanded PTFE Joint Sealant Roll Tape, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.