Polyester

Background

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

Polyester is used in the manufacture of many products, including clothing, home furnishings,Sunny Layflat Hose, computer and recording tapes, and electrical insulation.C19400. It does not absorb moisture, but does absorb oil;nickel silver alloy-, soil-, and fire-silver points. Its low absorbency also makes it naturally resistant to stains.Steel rivets,Aluminum rivets.copper rivets, and not damaged by mildew.AgCdO Bimetal rivet, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

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

The Manufacturing
Process

Polyester is manufactured by one of several methods.CuSn5 Phosphor Bronze Strip. The four basic forms are filament,C5100 Bronze Strip, tow, and fiberfill. In the filament form,C28000 Brass Strip, producing smooth-H63 Brass Strip Coil.C27000 CuZn35 Brass, filaments are cut to short,H65 Brass Strip Coil.C26000 CuZn30 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.H80 Brass Strip Coil.

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-C22000 CuZn10 Brass Strip,C22000 Brass Strip, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Brass 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.C75200 Copper Nickel Zinc Strip, which are usually round,C7701 C7521 Nickel Silver Strip. The number of holes in the spinneret determines the size of the yarn,Copper Nickel Zinc.
• 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,Nickel Silver Strip. 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,Nickel Plated Copper Strip.
• PCB Copper,Copper Clad. Also,Silver Onlay Brass Strip,Silver Onlay.

Winding

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

Silver Clad Copper Strip

Silver Clad, 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,Semi Tubular Brass Rivet. The rope-Brass Tubular Rivet.

Drawing tow

• 1 Newly-Solid Brass Rivet.Solid Copper Rivets.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Electrical Contact Rivets.Silver Tungsten Electrical Contact.

Cutting

• 4 Following heat setting,Moving Contact Rivets. 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)Cervical Secretion IGFBP-1 PROM Test Strip.Cervical Secretion IGFBP-1 PROM Test, such ascarpet,polyester filaments are cut into 6 inch (15 cm)IGFBP-1 PROM Test.

The Future

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