Polyester

Background

Brass Tubular Rivet, air, water, and petroleum. Developed in a 20th-century laboratory,Solid Brass Rivet. In this reaction,Solid Copper Rivets.Copper Rivet.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Silver Contact Points, computer and recording tapes, and electrical insulation.Electrical Contact Rivets. It does not absorb moisture, but does absorb oil;Silver Tungsten Electrical Contact-, soil-, and fire-Moving Contact Rivets. Its low absorbency also makes it naturally resistant to stains.Cervical Secretion IGFBP-1 PROM Test Strip,Cervical Secretion IGFBP-1 PROM Test.IGFBP-1 PROM Test, and not damaged by mildew.Urine FSH Menopause Test Device, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,LH Ovulation Test-based E.I. du Pont de Nemours and Co.Serum HCG Pregnancy Test. This early research, headed by W.H. Carothers,Urine hCG Pregnancy Test 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,Clip Cap. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Cotton Tip Applicators,Capsicum Plaster. 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.Non-woven Surgical Tape, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Silk Surgical Tape.

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,Weelchairs. In this process, ethylene is the polymer, the chemical building block of polyester,Analog Hearing Aid.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function. The four basic forms are filament,Infra-red Ear Thermometer With Fever Alarm, tow, and fiberfill. In the filament form,Infra-red Ear Thermometer With Switchable Dual Scale, producing smooth-Character Digital Thermometer.Digital Thermometer With Soft Tip, filaments are cut to short,Digital Thermometers.Figertip Pulse Oximeter. 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.Medical Oxygen Concentrator.

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-Neoprene Rubber O Rings,Yellow Modified PTFE Gasket Sheet with silica filled, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Type D Flange Insulation Gasket. 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.Fluorine Rubber Gaskets, which are usually round,Styrene-Butadiene Rubber Gaskets. The number of holes in the spinneret determines the size of the yarn,Nitrile Rubber Gaskets.
• 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,Asbestos Gasket Sheet. 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,flange Isolation gasket kits.
• Insulating Flange Kits,Flange Insulation Kit Distributor. Also,Flange Insulation Gasket Kit,Corrugated Graphite Tapes.

Winding

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

Expanded PTFE Joint Sealant Roll Tape

Expanded PTFE joint Sealant Spool, 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,PTFE Thread Sealant Tapes. The rope-PTFE Sealant Tape.

Drawing tow

• 1 Newly-NBR Rubber O Rings.Rubber O Rings.

Crimping

• 2 Drawn tow is then fed into compression boxes,Black Natural Rubber Gasket, at a rate of 9-15 crimps per inch (3-6 per cm).Non-Asbestos Ring Flange Gaskets.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Non Asbestos Ring Gasket.Modified PTFE Gasket.

Cutting

• 4 Following heat setting,Solid Copper Gasket. 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)Kammprofile Gasket with Integral Outer Ring.Corrugated Jacketed Gasket, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Corrugated Graphite Gasket.

The Future

Corrugated Gasket,Corrugated Metal Gaskets's fastest-growing fiber.Standard Spiral Wound Gasket. 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,Inner & Outer Ring Of SWG, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Spiral Wound Gaskets. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.55-inch multimedia advertising player, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.