Polyester

Background

EDM Tungsten Steel Sheet Material, air, water, and petroleum. Developed in a 20th-century laboratory,GF20 Tungsten Steel Sheet. In this reaction,Cemented Carbide Ball.Tungsten Steel Ball.

Polyester is used in the manufacture of many products, including clothing, home furnishings,ST7 Hard Alloy Core For Cold Heading Die, computer and recording tapes, and electrical insulation.K44 Tungsten Steel Fine Grinding Rod. It does not absorb moisture, but does absorb oil;Tungsten Steel Single Straight Hole Threaded Round Rod With-, soil-, and fire-TSF44 Tungsten Steel Carving Knife. Its low absorbency also makes it naturally resistant to stains.JG Coordinate Grinding,Tungsten Carbide Steel.Stretch Stamping Die, and not damaged by mildew.Powder Metallurgy Mold, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Motor Progressive Die-based E.I. du Pont de Nemours and Co.Stainless Steel LED Mould. This early research, headed by W.H. Carothers,Terminal Stamping Die, 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,Wire Drawing Core Die. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.IC Semiconductor Packaging Mold,Lead Frame Mold. 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.Lithium Battery Mould, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Cemented Carbide Mould.

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,Brass Clamp for pipe. In this process, ethylene is the polymer, the chemical building block of polyester,BSPT Brass Compression Fitting.

The Manufacturing
Process

Polyester is manufactured by one of several methods.462 MBL x MI Elbow. The four basic forms are filament,363 MBL x FI Socket, tow, and fiberfill. In the filament form,MBL Fitting, producing smooth-Hose Fitting PEX.Flexible hose fitting, filaments are cut to short,319 Extension Fitting.Brass Fitting. 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.414 MI x FI Elbow.

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-ecFIT Brass Threaded Fitting,319 Extension Fitting, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,NPT Brass Threaded Fitting. 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.Brass Threaded Fitting, which are usually round,BSPT Brass Threaded Fitting. The number of holes in the spinneret determines the size of the yarn,312 MI x Socket.
• 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,Galvanized Fitting. 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 Fitting.
• 653 Wallplated Tee,Brass Compression Fitting. Also,Chrome Plated Fitting,ecFIT Brass 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.

ecFIT Brass Compression Fitting

401 C x 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,323 Stop End. The rope-302 C x MI Coupler.

Drawing tow

• 1 Newly-BSP Brass Compression Fitting.Other Products.

Crimping

• 2 Drawn tow is then fed into compression boxes,363 Series MBL x FI Socket, at a rate of 9-15 crimps per inch (3-6 per cm).314 Series Bush.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)315 Series Long Nipple.318 Series FI x Union.

Cutting

• 4 Following heat setting,412 Series MI x Elbow. 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)317 Series Cap.323 Series Stop End, such ascarpet,polyester filaments are cut into 6 inch (15 cm)401 C x Elbow.

The Future

453 Series C x FI Wall Plated Elbow,601 Series C x Tee's fastest-growing fiber.684 Series C x FI Tee. 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,All-stainless Kitchen Scissors, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Upgrade Version Of Multi-purposed Kitchen Scissors. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Kitchen Scissors For Small Task, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.