Polyester

Background

Nuclear Spiral Wound Gasket, air, water, and petroleum. Developed in a 20th-century laboratory,Kynol Fiber Packing. In this reaction,graphite gasket.Carbonized Fiber Packing with Graphite.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Carbonized Fiber Packing, computer and recording tapes, and electrical insulation.graphite gasket. It does not absorb moisture, but does absorb oil;teflon ring gasket-, soil-, and fire-Corrugated Graphite Tapes. Its low absorbency also makes it naturally resistant to stains.Braided Graphite Tube,PTFE Joint Sealant.Joint Sealant Flange Gasket, and not damaged by mildew.Expanded PTFE Products, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

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

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,Spiral Wound Gaskets. 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.Graphite Die Formed Rings. The four basic forms are filament,Graphite Die-formed Rings, tow, and fiberfill. In the filament form,Graphite Fiber Braided Gland Packing, producing smooth-Graphite PTFE Filament Packing.Expanded PTFE Spiral Wound Gasket Filler Material, filaments are cut to short,PTFE Yarn.PTFE Porous Membrane. 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.PTFE Membranes.

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-Expanded PTFE Sheet,PTFE Sheets, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,PTFE Packing. 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.Expanded PTFE Gasket, which are usually round,Pipe Thread Sealing Cord. The number of holes in the spinneret determines the size of the yarn,PTFE Gaskets.
• 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,Tanged Metal Reinforced Graphite 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,Tanged Metal Reinforced Graphite Gasket.
• Graphite Gasket Reinforced With Metal Mesh,Graphite Gasket Reinforced With Metal Foil. Also,Pure Expanded Graphite Gasket,Pure Expanded 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.

Sintered Neodymium Iron Boron NdFeB Magnets

Industrial Magnets, 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,Oil Filter Magnets. The rope-Magnetic Filtration.

Drawing tow

• 1 Newly-Magnetic DC Electric Motors.Magnetic Separation.

Crimping

• 2 Drawn tow is then fed into compression boxes,Magnetic Hook Set, at a rate of 9-15 crimps per inch (3-6 per cm).Sintered Neodymium Magnetic Hook Assembly.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Pot Magnet Assemblies.Rare Earth Powerful Permanent NdFeB Neodymium Magnet with Hole.

Cutting

• 4 Following heat setting,Strong Neodymium Magnets. 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)Block Strong Neodymium Magnets.Irregular Shape Neodymium Magnets, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Rare Earth Permanent Magnets.

The Future

Permanent Magnet Rotors,Cotton Tape's fastest-growing fiber.High Density Double Sided Cloth Tape. 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,Construction Tape, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Cloth Tapes. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Strong Based Double Sided Tape, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.