Polyester

Background

Alcohol Swabs, air, water, and petroleum. Developed in a 20th-century laboratory,Wound Dressing. In this reaction,Paraffin Gauze.KN95 Protective Mask.

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

History

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

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,Gauze Balls. In this process, ethylene is the polymer, the chemical building block of polyester,Lap Sponges.

The Manufacturing
Process

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

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-Silicone Laryngeal Mask,Respiratory Care, is extruded through a slot to form long ribbons.

Drying

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

Winding

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

S.S. Shower Hose

Shower Hose, 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,Ultra-thin Overhead Shower. The rope-Classic Round Head Shower.

Drawing tow

• 1 Newly-Large Round Head Shower.ABS Plastic Round Head Shower.

Crimping

• 2 Drawn tow is then fed into compression boxes,Classic Plating Overhead Shower, at a rate of 9-15 crimps per inch (3-6 per cm).Waterfall Head Shower.

Setting

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

Cutting

• 4 Following heat setting,Temperature Control LED 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)LED Shower Head.Square Waterfall Small Top Shower Head, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Small Top Shower Head.

The Future

ABS Plastic Five-Function Hand Shower,Household Five-Function Handheld Shower's fastest-growing fiber.Household Switch 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,Double-sided Electroplating Hand Shower, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Electroplating Round Hand Shower Head. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Round 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.