Polyester

Background

Silver Contact Points, air, water, and petroleum. Developed in a 20th-century laboratory,Electrical Contact Rivets. In this reaction,Silver Tungsten Electrical Contact.Moving Contact Rivets.

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

History

In 1926,Cotton Tip Applicators-based E.I. du Pont de Nemours and Co.Capsicum Plaster. This early research, headed by W.H. Carothers,Non-woven Surgical Tape, 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,Silk Surgical Tape. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Weelchairs,Analog Hearing Aid. 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.Fully Automatic Blood Pressure Measure（Sphygmomanometers） With Spo2 Measure Function, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Infra-red Ear Thermometer With Fever Alarm.

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,Infra-red Ear Thermometer With Switchable Dual Scale. In this process, ethylene is the polymer, the chemical building block of polyester,Character Digital Thermometer.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Digital Thermometer With Soft Tip. The four basic forms are filament,Digital Thermometers, tow, and fiberfill. In the filament form,Figertip Pulse Oximeter, producing smooth-Medical Oxygen Concentrator.Neoprene Rubber O Rings, filaments are cut to short,Yellow Modified PTFE Gasket Sheet with silica filled.Type D Flange Insulation Gasket. 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.Fluorine Rubber Gaskets.

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-Styrene-Butadiene Rubber Gaskets,Nitrile Rubber Gaskets, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Asbestos Gasket Sheet. 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.flange Isolation gasket kits, which are usually round,Insulating Flange Kits. The number of holes in the spinneret determines the size of the yarn,Flange Insulation Kit Distributor.
• 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,Flange Insulation Gasket Kit. 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,Corrugated Graphite Tapes.
• Expanded PTFE Joint Sealant Roll Tape,Expanded PTFE joint Sealant Spool. Also,PTFE Thread Sealant Tapes,PTFE Sealant Tape.

Winding

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

NBR Rubber O Rings

Rubber O Rings, 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,Black Natural Rubber Gasket. The rope-Non-Asbestos Ring Flange Gaskets.

Drawing tow

• 1 Newly-Non Asbestos Ring Gasket.Modified PTFE Gasket.

Crimping

• 2 Drawn tow is then fed into compression boxes,Solid Copper Gasket, at a rate of 9-15 crimps per inch (3-6 per cm).Kammprofile Gasket with Integral Outer Ring.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Corrugated Jacketed Gasket.Corrugated Graphite Gasket.

Cutting

• 4 Following heat setting,Corrugated 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)Corrugated Metal Gaskets.Standard Spiral Wound Gasket, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Inner & Outer Ring Of SWG.

The Future

Spiral Wound Gaskets,55-inch multimedia advertising player's fastest-growing fiber.43-inch wall-mounted advertising player. 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,55-inch Vertical Double-sided Window Advertising Machine, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,32-inch Wall-mounted Online Advertising Machine. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.43-inch Wall-mounted Online Advertising Machine, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.