Polyester

Background

china cheap PTFE Gaskets, air, water, and petroleum. Developed in a 20th-century laboratory,PTFE Gaskets. In this reaction,viton gasket.NBR gasket.

Polyester is used in the manufacture of many products, including clothing, home furnishings,SBR gasket, computer and recording tapes, and electrical insulation.Graphite gaskets. It does not absorb moisture, but does absorb oil;Automatic Winding Machine for Spiral Wound Gaskets-, soil-, and fire-Medium Winding Machine for Spiral Wound Gasket. Its low absorbency also makes it naturally resistant to stains.low price Small Winding Machine for Spiral Wound Gasket,Small Winding Machine for Spiral Wound Gasket.china Viton rubber sheet factory, and not damaged by mildew.Viton rubber sheet, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,china Nitrile Rubber sipplier-based E.I. du Pont de Nemours and Co.Nitrile Rubber. This early research, headed by W.H. Carothers,china Neoprene Rubber supplier, 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,china Natural Rubber Insertion factory. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Natural Rubber Insertion,china EPDM rubber factory. 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.Small Winding Machine for Spiral Wound Gasket, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Medium Winding Machine for Spiral Wound Gasket.

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,Automatic Winding Machine for Spiral Wound Gaskets. In this process, ethylene is the polymer, the chemical building block of polyester,Expanded PTFE Sealing Tape.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Expanded PTFE Sheet. The four basic forms are filament,EXPANDED PTFE SHEET, tow, and fiberfill. In the filament form,EPDM rubber, producing smooth-Natural Rubber Insertion.Neoprene Rubber, filaments are cut to short,Nitrile Rubber.RUBBE SHEET. 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.Flange gaskets.

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-FLANGE GASKETS,Rubber gaskets and seals, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,GRAPHITE GASKETS AND SEALS. 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.BX Ring Joint Gasket, which are usually round,BX RING JOINT GASKET. The number of holes in the spinneret determines the size of the yarn,RX RING JOINT 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,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,Magnetic Socks，magnetic compression socks，magnetic therapy socks.
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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.

Oxygen Concentrator

Oxygen Concentrator, 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,Sphygmomanometers. The rope-Non-contact Digital Thermometer.

Drawing tow

• 1 Newly-Diagnostics.Endotracheal Tube.

Crimping

• 2 Drawn tow is then fed into compression boxes,Nasopharyngeal Airway, at a rate of 9-15 crimps per inch (3-6 per cm).Anesthesia Supplies.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Yank.Surgery Supplies.

Cutting

• 4 Following heat setting,Zinc Oxide Plaster. 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)Alcohol Swabs.Wound Dressing, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Paraffin Gauze.

The Future

KN95 Protective Mask,Disposable Protective Mask's fastest-growing fiber.Isolation Gown. 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,Nonwoven Disposables, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Blood Bag. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Leukocyte Reduction Filter, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.