Polyester

Background

KN95 Protective Mask, air, water, and petroleum. Developed in a 20th-century laboratory,Disposable Protective Mask. In this reaction,Isolation Gown.Nonwoven Disposables.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Blood Bag, computer and recording tapes, and electrical insulation.Leukocyte Reduction Filter. It does not absorb moisture, but does absorb oil;Single Double Triple Lumen Hemodialysis Catheter Kit-, soil-, and fire-Disposable Syringe. Its low absorbency also makes it naturally resistant to stains.Insulin Syringe,Hypodermic Needles.Crepe Bandage, and not damaged by mildew.Plaster Of Paris Bandage, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,PBT Bandage-based E.I. du Pont de Nemours and Co.Cotton Wool Roll. This early research, headed by W.H. Carothers,Zigzag Cotton, 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,Cotton Roll. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Medical Cotton,Gauze Balls. 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.Lap Sponges, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Urinary Catheter.

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,Urinary Leg Bag. In this process, ethylene is the polymer, the chemical building block of polyester,Nebulizer Mask.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Venturi Mask. The four basic forms are filament,Resuscitator, tow, and fiberfill. In the filament form,Nelaton Catheter, producing smooth-Oxygen Mask With Reservoir Bagen.Rectal Tube, filaments are cut to short,Silicone Laryngeal Mask.Respiratory Care. 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.Shower Accessories.

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-Classic Shower Set,Flat Shower Set, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Stainless Steel Chrome-plated Shower Set. 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.Classic Electroplating Shower Set, which are usually round,Retractable Round Shower Rod Set. The number of holes in the spinneret determines the size of the yarn,Round Shower Set.
• 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,Round Shower Rail. 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,Shower Rail.
• Stainless Steel Polished Shower Hose,S.S. Shower Hose. Also,Shower Hose,Ultra-thin Overhead Shower.

Winding

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

Classic Round Head Shower

Large Round Head Shower, 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,ABS Plastic Round Head Shower. The rope-Classic Plating Overhead Shower.

Drawing tow

• 1 Newly-Waterfall Head Shower.Electroplating Square Head Shower.

Crimping

• 2 Drawn tow is then fed into compression boxes,Yellow Square Head Shower, at a rate of 9-15 crimps per inch (3-6 per cm).Temperature Control LED Shower Head.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)LED Shower Head.Square Waterfall Small Top Shower Head.

Cutting

• 4 Following heat setting,Small Top Shower Head. 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)ABS Plastic Five-Function Hand Shower.Household Five-Function Handheld Shower, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Household Switch Hand Shower Head.

The Future

Double-sided Electroplating Hand Shower,Electroplating Round Hand Shower Head's fastest-growing fiber.Round Hand Shower Head. 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,Large Size Five-function Hand Shower, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Single Function Round Hand Shower Head. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Electroplating Hand Shower Head, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.