Polyester

Background

Pool Backwash PVC Layflat Hose, air, water, and petroleum. Developed in a 20th-century laboratory,PVC Lay Flat Discharge Hose. In this reaction,Sunny Layflat Hose.C19400.

Polyester is used in the manufacture of many products, including clothing, home furnishings,nickel silver alloy, computer and recording tapes, and electrical insulation.silver points. It does not absorb moisture, but does absorb oil;Steel rivets-, soil-, and fire-Aluminum rivets. Its low absorbency also makes it naturally resistant to stains.copper rivets,AgCdO Bimetal rivet.AgCdO contact, and not damaged by mildew.CNC Parts, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,CuBe2 Beryllium Copper Strip-based E.I. du Pont de Nemours and Co.CuBe2 Beryllium Copper. This early research, headed by W.H. Carothers,C17200 Beryllium Copper 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,C17200 Beryllium Copper. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Beryllium Copper,CuSn6 Phosphor Bronze 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.C51900 Bronze Strip, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.C51000 Bronze 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,CuSn5 Phosphor Bronze Strip. In this process, ethylene is the polymer, the chemical building block of polyester,C5100 Bronze Strip.

The Manufacturing
Process

Polyester is manufactured by one of several methods.C28000 Brass Strip. The four basic forms are filament,H63 Brass Strip Coil, tow, and fiberfill. In the filament form,C27000 CuZn35 Brass, producing smooth-H65 Brass Strip Coil.C26000 CuZn30 Brass Strip, filaments are cut to short,H80 Brass Strip Coil.C22000 CuZn10 Brass Strip. 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.C22000 Brass 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-Brass Strip,C75200 Copper Nickel Zinc Strip, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,C7701 C7521 Nickel Silver Strip. 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.Copper Nickel Zinc, which are usually round,Nickel Silver Strip. The number of holes in the spinneret determines the size of the yarn,Nickel Plated Copper Strip.
• 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,PCB Copper. 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,Copper Clad.
• Silver Onlay Brass Strip,Silver Onlay. Also,Silver Clad Copper Strip,Silver Clad.

Winding

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

Semi Tubular Brass Rivet

Brass Tubular Rivet, 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,Solid Brass Rivet. The rope-Solid Copper Rivets.

Drawing tow

• 1 Newly-Copper Rivet.Silver Contact Points.

Crimping

• 2 Drawn tow is then fed into compression boxes,Electrical Contact Rivets, at a rate of 9-15 crimps per inch (3-6 per cm).Silver Tungsten Electrical Contact.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Moving Contact Rivets.Cervical Secretion IGFBP-1 PROM Test Strip.

Cutting

• 4 Following heat setting,Cervical Secretion IGFBP-1 PROM Test. 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)IGFBP-1 PROM Test.Urine FSH Menopause Test Device, such ascarpet,polyester filaments are cut into 6 inch (15 cm)LH Ovulation Test.

The Future

Serum HCG Pregnancy Test,Urine hCG Pregnancy Test Strip's fastest-growing fiber.Clip Cap. 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,Cotton Tip Applicators, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Capsicum Plaster. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Non-woven Surgical Tape, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.