Polyester

Background

PTFE Packing with Kynol Fiber Corners, air, water, and petroleum. Developed in a 20th-century laboratory,ASME Spiral Wound Gasket. In this reaction,glass-to-glass.Exhaust Spiral Wound Gaskets.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Special Materials Spiral Wound Gaskets, computer and recording tapes, and electrical insulation.Nuclear Spiral Wound Gasket. It does not absorb moisture, but does absorb oil;Kynol Fiber Packing-, soil-, and fire-graphite gasket. Its low absorbency also makes it naturally resistant to stains.Carbonized Fiber Packing with Graphite,Carbonized Fiber Packing.graphite gasket, and not damaged by mildew.teflon ring gasket, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Corrugated Graphite Tapes-based E.I. du Pont de Nemours and Co.Braided Graphite Tube. This early research, headed by W.H. Carothers,PTFE Joint Sealant, 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,Joint Sealant Flange Gasket. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Expanded PTFE Products,eptfe. 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.ptfe joint sealant tape, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Graphite Packing With PTFE Impregnated.

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,Corrugated Graphite Tapes. In this process, ethylene is the polymer, the chemical building block of polyester,CGFO Packing.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Kynol Fiber Packing. The four basic forms are filament,Standard Spiral Wound Gasket, tow, and fiberfill. In the filament form,Special Materials Spiral Wound Gaskets, producing smooth-Spiral Wound Gaskets.CGFO Packing, filaments are cut to short,Graphite Die Formed Rings.Graphite Die-formed Rings. 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.Graphite Fiber Braided Gland Packing.

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 PTFE Filament Packing,Expanded PTFE Spiral Wound Gasket Filler Material, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,PTFE Yarn. 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 Porous Membrane, which are usually round,PTFE Membranes. The number of holes in the spinneret determines the size of the yarn,Expanded PTFE Sheet.
• 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,PTFE Sheets. 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,PTFE Packing.
• Expanded PTFE Gasket,Pipe Thread Sealing Cord. Also,PTFE Gaskets,Tanged Metal Reinforced Graphite Gasket.

Winding

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

Tanged Metal Reinforced Graphite Gasket

Graphite Gasket Reinforced With Metal Mesh, 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,Graphite Gasket Reinforced With Metal Foil. The rope-Pure Expanded Graphite Gasket.

Drawing tow

• 1 Newly-Pure Expanded Graphite Gasket.Sintered Neodymium Iron Boron NdFeB Magnets.

Crimping

• 2 Drawn tow is then fed into compression boxes,Industrial Magnets, at a rate of 9-15 crimps per inch (3-6 per cm).Oil Filter Magnets.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Magnetic Filtration.Magnetic DC Electric Motors.

Cutting

• 4 Following heat setting,Magnetic Separation. 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)Magnetic Hook Set.Sintered Neodymium Magnetic Hook Assembly, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Pot Magnet Assemblies.

The Future

Rare Earth Powerful Permanent NdFeB Neodymium Magnet with Hole,Strong Neodymium Magnets's fastest-growing fiber.Block Strong Neodymium Magnets. 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,Irregular Shape Neodymium Magnets, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Rare Earth Permanent Magnets. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Permanent Magnet Rotors, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.