Polyester

Background

C22000 CuZn10 Brass Strip, air, water, and petroleum. Developed in a 20th-century laboratory,C22000 Brass Strip. In this reaction,Brass Strip.C75200 Copper Nickel Zinc Strip.

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

History

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

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,Electrical Contact Rivets. In this process, ethylene is the polymer, the chemical building block of polyester,Silver Tungsten Electrical Contact.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Moving Contact Rivets. The four basic forms are filament,Cervical Secretion IGFBP-1 PROM Test Strip, tow, and fiberfill. In the filament form,Cervical Secretion IGFBP-1 PROM Test, producing smooth-IGFBP-1 PROM Test.Urine FSH Menopause Test Device, filaments are cut to short,LH Ovulation Test.Serum HCG Pregnancy 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.Urine hCG Pregnancy Test 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-Clip Cap,Cotton Tip Applicators, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Capsicum Plaster. 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.Non-woven Surgical Tape, which are usually round,Silk Surgical Tape. The number of holes in the spinneret determines the size of the yarn,Weelchairs.
• 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,Analog Hearing Aid. 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,Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function.
• Infra-red Ear Thermometer With Fever Alarm,Infra-red Ear Thermometer With Switchable Dual Scale. Also,Character Digital Thermometer,Digital Thermometer With Soft Tip.

Winding

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

Digital Thermometers

Figertip Pulse Oximeter, 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,Medical Oxygen Concentrator. The rope-Neoprene Rubber O Rings.

Drawing tow

• 1 Newly-Yellow Modified PTFE Gasket Sheet with silica filled.Type D Flange Insulation Gasket.

Crimping

• 2 Drawn tow is then fed into compression boxes,Fluorine Rubber Gaskets, at a rate of 9-15 crimps per inch (3-6 per cm).Styrene-Butadiene Rubber Gaskets.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Nitrile Rubber Gaskets.Asbestos Gasket Sheet.

Cutting

• 4 Following heat setting,flange Isolation gasket kits. 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)Insulating Flange Kits.Flange Insulation Kit Distributor, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Flange Insulation Gasket Kit.

The Future

Corrugated Graphite Tapes,Expanded PTFE Joint Sealant Roll Tape's fastest-growing fiber.Expanded PTFE joint Sealant Spool. 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,PTFE Thread Sealant Tapes, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,PTFE Sealant Tape. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.NBR Rubber O Rings, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.