Polyester

Background

Anti-Alkali Primer, air, water, and petroleum. Developed in a 20th-century laboratory,One-Component Epoxy Ester Primer. In this reaction,Various Color Epoxy Anticorrosive Topcoat.Epoxy Paint.

Polyester is used in the manufacture of many products, including clothing, home furnishings,One-Component Acrylic Topcoat, computer and recording tapes, and electrical insulation.Acrylic Baking Paint. It does not absorb moisture, but does absorb oil;Polyurethane Topcoat-, soil-, and fire-Polyurethane Baking Paint. Its low absorbency also makes it naturally resistant to stains.Polyurethane Varnish,Polyurethane Orange Grain Paint.Chlorinated Rubber Anticorrosive Topcoat, and not damaged by mildew.Anti-Corrosive Paint, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Alkyd Enamel-based E.I. du Pont de Nemours and Co.Alkyd Varnish. This early research, headed by W.H. Carothers,Extra White Silver Powder 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,Gray Steel Structure Special Topcoat. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Alkyd Paint,Oil Based Paint. 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.China Expanded PTFE Sheet Supplier, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.China Expanded PTFE Sheet Manufacture.

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,Full Automatic Spiral Wound Gasket Winding Machine. In this process, ethylene is the polymer, the chemical building block of polyester,china cheap Spiral wound gaskets.

The Manufacturing
Process

Polyester is manufactured by one of several methods.BX Ring Joint Gasket. The four basic forms are filament,china RX Ring Joint Gasket supplier, tow, and fiberfill. In the filament form,RX Ring Joint Gasket, producing smooth-china cheap PTFE Gaskets.PTFE Gaskets, filaments are cut to short,viton gasket.NBR gasket. 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.SBR 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-Graphite gaskets,Automatic Winding Machine for Spiral Wound Gaskets, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Medium Winding Machine for Spiral Wound Gasket. 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.low price Small Winding Machine for Spiral Wound Gasket, which are usually round,Small Winding Machine for Spiral Wound Gasket. The number of holes in the spinneret determines the size of the yarn,china Viton rubber sheet factory.
• 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,Viton rubber sheet. 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,china Nitrile Rubber sipplier.
• Nitrile Rubber,china Neoprene Rubber supplier. Also,china Natural Rubber Insertion factory,Natural Rubber Insertion.

Winding

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

china EPDM rubber factory

Small Winding Machine for Spiral Wound Gasket, 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,Medium Winding Machine for Spiral Wound Gasket. The rope-Automatic Winding Machine for Spiral Wound Gaskets.

Drawing tow

• 1 Newly-Expanded PTFE Sealing Tape.Expanded PTFE Sheet.

Crimping

• 2 Drawn tow is then fed into compression boxes,EXPANDED PTFE SHEET, at a rate of 9-15 crimps per inch (3-6 per cm).EPDM rubber.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Natural Rubber Insertion.Neoprene Rubber.

Cutting

• 4 Following heat setting,Nitrile Rubber. 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)RUBBE SHEET.Flange gaskets, such ascarpet,polyester filaments are cut into 6 inch (15 cm)FLANGE GASKETS.

The Future

Rubber gaskets and seals,GRAPHITE GASKETS AND SEALS's fastest-growing fiber.BX Ring Joint Gasket. 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,BX RING JOINT GASKET, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,RX RING JOINT GASKET. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.GASKET, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.