Polyester

Background

graphite gasket, air, water, and petroleum. Developed in a 20th-century laboratory,teflon ring gasket. In this reaction,Corrugated Graphite Tapes.Braided Graphite Tube.

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

History

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

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,Graphite PTFE Filament Packing. In this process, ethylene is the polymer, the chemical building block of polyester,Expanded PTFE Spiral Wound Gasket Filler Material.

The Manufacturing
Process

Polyester is manufactured by one of several methods.PTFE Yarn. The four basic forms are filament,PTFE Porous Membrane, tow, and fiberfill. In the filament form,PTFE Membranes, producing smooth-Expanded PTFE Sheet.PTFE Sheets, filaments are cut to short,PTFE Packing.Expanded PTFE 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.Pipe Thread Sealing Cord.

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-PTFE Gaskets,Tanged Metal Reinforced Graphite Gasket, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Tanged Metal Reinforced Graphite 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.Graphite Gasket Reinforced With Metal Mesh, which are usually round,Graphite Gasket Reinforced With Metal Foil. The number of holes in the spinneret determines the size of the yarn,Pure Expanded Graphite 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,Pure Expanded 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,Sintered Neodymium Iron Boron NdFeB Magnets.
• Industrial Magnets,Oil Filter Magnets. Also,Magnetic Filtration,Magnetic DC Electric Motors.

Winding

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

Magnetic Separation

Magnetic Hook Set, 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,Sintered Neodymium Magnetic Hook Assembly. The rope-Pot Magnet Assemblies.

Drawing tow

• 1 Newly-Rare Earth Powerful Permanent NdFeB Neodymium Magnet with Hole.Strong Neodymium Magnets.

Crimping

• 2 Drawn tow is then fed into compression boxes,Block Strong Neodymium Magnets, at a rate of 9-15 crimps per inch (3-6 per cm).Irregular Shape Neodymium Magnets.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Rare Earth Permanent Magnets.Permanent Magnet Rotors.

Cutting

• 4 Following heat setting,Cotton Tape. 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)High Density Double Sided Cloth Tape.Construction Tape, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Cloth Tapes.

The Future

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