Polyester

Background

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

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

History

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

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,Urine FSH Menopause Test Device. In this process, ethylene is the polymer, the chemical building block of polyester,LH Ovulation Test.

The Manufacturing
Process

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

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-Analog Hearing Aid,Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Infra-red Ear Thermometer With Fever Alarm. 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.Infra-red Ear Thermometer With Switchable Dual Scale, which are usually round,Character Digital Thermometer. The number of holes in the spinneret determines the size of the yarn,Digital Thermometer With Soft Tip.
• 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,Digital Thermometers. 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,Figertip Pulse Oximeter.
• Medical Oxygen Concentrator,Neoprene Rubber O Rings. Also,Yellow Modified PTFE Gasket Sheet with silica filled,Type D Flange Insulation Gasket.

Winding

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

Fluorine Rubber Gaskets

Styrene-Butadiene Rubber Gaskets, 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,Nitrile Rubber Gaskets. The rope-Asbestos Gasket Sheet.

Drawing tow

• 1 Newly-flange Isolation gasket kits.Insulating Flange Kits.

Crimping

• 2 Drawn tow is then fed into compression boxes,Flange Insulation Kit Distributor, at a rate of 9-15 crimps per inch (3-6 per cm).Flange Insulation Gasket Kit.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Corrugated Graphite Tapes.Expanded PTFE Joint Sealant Roll Tape.

Cutting

• 4 Following heat setting,Expanded PTFE joint Sealant Spool. 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)PTFE Thread Sealant Tapes.PTFE Sealant Tape, such ascarpet,polyester filaments are cut into 6 inch (15 cm)NBR Rubber O Rings.

The Future

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