Polyester

Background

C7701 C7521 Nickel Silver Strip, air, water, and petroleum. Developed in a 20th-century laboratory,Copper Nickel Zinc. In this reaction,Nickel Silver Strip.Nickel Plated Copper Strip.

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

History

In 1926,Solid Brass Rivet-based E.I. du Pont de Nemours and Co.Solid Copper Rivets. This early research, headed by W.H. Carothers,Copper Rivet, 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 Contact Points. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Electrical Contact Rivets,Silver Tungsten Electrical Contact. 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.Moving Contact Rivets, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Cervical Secretion IGFBP-1 PROM Test 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,Cervical Secretion IGFBP-1 PROM Test. In this process, ethylene is the polymer, the chemical building block of polyester,IGFBP-1 PROM Test.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Urine FSH Menopause Test Device. The four basic forms are filament,LH Ovulation Test, tow, and fiberfill. In the filament form,Serum HCG Pregnancy Test, producing smooth-Urine hCG Pregnancy Test Strip.Clip Cap, filaments are cut to short,Cotton Tip Applicators.Capsicum Plaster. 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.Non-woven Surgical Tape.

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-Silk Surgical Tape,Weelchairs, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Analog Hearing Aid. 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.Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function, which are usually round,Infra-red Ear Thermometer With Fever Alarm. The number of holes in the spinneret determines the size of the yarn,Infra-red Ear Thermometer With Switchable Dual Scale.
• 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,Character Digital Thermometer. 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,Digital Thermometer With Soft Tip.
• Digital Thermometers,Figertip Pulse Oximeter. Also,Medical Oxygen Concentrator,Neoprene Rubber O Rings.

Winding

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

Yellow Modified PTFE Gasket Sheet with silica filled

Type D Flange Insulation Gasket, 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,Fluorine Rubber Gaskets. The rope-Styrene-Butadiene Rubber Gaskets.

Drawing tow

• 1 Newly-Nitrile Rubber Gaskets.Asbestos Gasket Sheet.

Crimping

• 2 Drawn tow is then fed into compression boxes,flange Isolation gasket kits, at a rate of 9-15 crimps per inch (3-6 per cm).Insulating Flange Kits.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Flange Insulation Kit Distributor.Flange Insulation Gasket Kit.

Cutting

• 4 Following heat setting,Corrugated Graphite Tapes. 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)Expanded PTFE Joint Sealant Roll Tape.Expanded PTFE joint Sealant Spool, such ascarpet,polyester filaments are cut into 6 inch (15 cm)PTFE Thread Sealant Tapes.

The Future

PTFE Sealant Tape,NBR Rubber O Rings's fastest-growing fiber.Rubber O Rings. 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,Black Natural Rubber Gasket, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Non-Asbestos Ring Flange Gaskets. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Non Asbestos Ring Gasket, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.