Polyester

Background

Putty Powder, air, water, and petroleum. Developed in a 20th-century laboratory,Old Powder. In this reaction,Other Paints and Coatings.Ordinary Exterior Wall Paint.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Elastic Anti-Cracking Exterior Wall Paint, computer and recording tapes, and electrical insulation.Ordinary Exterior Wall Coating. It does not absorb moisture, but does absorb oil;Ordinary Interior Wall Paint-, soil-, and fire-Anti-Alkali Primer. Its low absorbency also makes it naturally resistant to stains.One-Component Epoxy Ester Primer,Various Color Epoxy Anticorrosive Topcoat.Epoxy Paint, and not damaged by mildew.One-Component Acrylic Topcoat, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Acrylic Baking Paint-based E.I. du Pont de Nemours and Co.Polyurethane Topcoat. This early research, headed by W.H. Carothers,Polyurethane Baking Paint, 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,Polyurethane Varnish. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Polyurethane Orange Grain Paint,Chlorinated Rubber Anticorrosive Topcoat. 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.Anti-Corrosive Paint, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Alkyd Enamel.

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,Alkyd Varnish. In this process, ethylene is the polymer, the chemical building block of polyester,Extra White Silver Powder Paint.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Gray Steel Structure Special Topcoat. The four basic forms are filament,Alkyd Paint, tow, and fiberfill. In the filament form,Oil Based Paint, producing smooth-China Expanded PTFE Sheet Supplier.China Expanded PTFE Sheet Manufacture, filaments are cut to short,Full Automatic Spiral Wound Gasket Winding Machine.china cheap Spiral wound gaskets. 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.BX Ring Joint Gasket.

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-china RX Ring Joint Gasket supplier,RX Ring Joint Gasket, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,china cheap PTFE Gaskets. 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.PTFE Gaskets, which are usually round,viton gasket. The number of holes in the spinneret determines the size of the yarn,NBR gasket.
• 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,SBR gasket. 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,Graphite gaskets.
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Winding

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

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Viton rubber sheet, 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,china Nitrile Rubber sipplier. The rope-Nitrile Rubber.

Drawing tow

• 1 Newly-china Neoprene Rubber supplier.china Natural Rubber Insertion factory.

Crimping

• 2 Drawn tow is then fed into compression boxes,Natural Rubber Insertion, at a rate of 9-15 crimps per inch (3-6 per cm).china EPDM rubber factory.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Small Winding Machine for Spiral Wound Gasket.Medium Winding Machine for Spiral Wound Gasket.

Cutting

• 4 Following heat setting,Automatic Winding Machine for Spiral Wound Gaskets. 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)Expanded PTFE Sealing Tape.Expanded PTFE Sheet, such ascarpet,polyester filaments are cut into 6 inch (15 cm)EXPANDED PTFE SHEET.

The Future

EPDM rubber,Natural Rubber Insertion's fastest-growing fiber.Neoprene Rubber. 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,Nitrile Rubber, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,RUBBE SHEET. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Flange gaskets, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.