Polyester

Background

Centerless Grinding Precision Machining, air, water, and petroleum. Developed in a 20th-century laboratory,Precision Tungsten Steel EDM. In this reaction,Tungsten Steel Slow Wire Processing.Tungsten Steel Processing.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Tungsten Steel Round Bar, computer and recording tapes, and electrical insulation.Tungsten Steel Sheet. It does not absorb moisture, but does absorb oil;Tungsten Steel Fine Grinding Rod-, soil-, and fire-Tungsten Steel Threading Hole Rod. Its low absorbency also makes it naturally resistant to stains.Tungsten Steel Needle Gauge,Tungsten Steel Measuring Tool.Tungsten Steel Plug Gauge, and not damaged by mildew.Non-magnetic Tungsten Steel, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Carbide Safety Hammer-based E.I. du Pont de Nemours and Co.KF12 Tungsten Steel Round Bar for High Speed Stamping. This early research, headed by W.H. Carothers,EDM Tungsten Steel Sheet Material, 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,GF20 Tungsten Steel Sheet. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Cemented Carbide Ball,Tungsten Steel Ball. 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.ST7 Hard Alloy Core For Cold Heading Die, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.K44 Tungsten Steel Fine Grinding Rod.

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,Tungsten Steel Single Straight Hole Threaded Round Rod With. In this process, ethylene is the polymer, the chemical building block of polyester,TSF44 Tungsten Steel Carving Knife.

The Manufacturing
Process

Polyester is manufactured by one of several methods.JG Coordinate Grinding. The four basic forms are filament,Tungsten Carbide Steel, tow, and fiberfill. In the filament form,Stretch Stamping Die, producing smooth-Powder Metallurgy Mold.Motor Progressive Die, filaments are cut to short,Stainless Steel LED Mould.Terminal Stamping Die. 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.Wire Drawing Core Die.

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-IC Semiconductor Packaging Mold,Lead Frame Mold, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Lithium Battery Mould. 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.Cemented Carbide Mould, which are usually round,Brass Clamp for pipe. The number of holes in the spinneret determines the size of the yarn,BSPT Brass Compression Fitting.
• 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,462 MBL x MI Elbow. 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,363 MBL x FI Socket.
• MBL Fitting,Hose Fitting PEX. Also,Flexible hose fitting,319 Extension Fitting.

Winding

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

Brass Fitting

414 MI x FI Elbow, 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,ecFIT Brass Threaded Fitting. The rope-319 Extension Fitting.

Drawing tow

• 1 Newly-NPT Brass Threaded Fitting.Brass Threaded Fitting.

Crimping

• 2 Drawn tow is then fed into compression boxes,BSPT Brass Threaded Fitting, at a rate of 9-15 crimps per inch (3-6 per cm).312 MI x Socket.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Galvanized Fitting.Nickel Plated Fitting.

Cutting

• 4 Following heat setting,653 Wallplated Tee. 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)Brass Compression Fitting.Chrome Plated Fitting, such ascarpet,polyester filaments are cut into 6 inch (15 cm)ecFIT Brass Fitting.

The Future

ecFIT Brass Compression Fitting,401 C x Elbow's fastest-growing fiber.323 Stop End. 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,302 C x MI Coupler, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,BSP Brass Compression Fitting. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Other Products, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.