Polyester

Background

Anesthesia Supplies, air, water, and petroleum. Developed in a 20th-century laboratory,Yank. In this reaction,Surgery Supplies.Zinc Oxide Plaster.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Alcohol Swabs, computer and recording tapes, and electrical insulation.Wound Dressing. It does not absorb moisture, but does absorb oil;Paraffin Gauze-, soil-, and fire-KN95 Protective Mask. Its low absorbency also makes it naturally resistant to stains.Disposable Protective Mask,Isolation Gown.Nonwoven Disposables, and not damaged by mildew.Blood Bag, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Leukocyte Reduction Filter-based E.I. du Pont de Nemours and Co.Single Double Triple Lumen Hemodialysis Catheter Kit. This early research, headed by W.H. Carothers,Disposable Syringe, 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,Insulin Syringe. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Hypodermic Needles,Crepe Bandage. 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.Plaster Of Paris Bandage, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.PBT Bandage.

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,Cotton Wool Roll. In this process, ethylene is the polymer, the chemical building block of polyester,Zigzag Cotton.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Cotton Roll. The four basic forms are filament,Medical Cotton, tow, and fiberfill. In the filament form,Gauze Balls, producing smooth-Lap Sponges.Urinary Catheter, filaments are cut to short,Urinary Leg Bag.Nebulizer Mask. 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.Venturi Mask.

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-Resuscitator,Nelaton Catheter, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Oxygen Mask With Reservoir Bagen. 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.Rectal Tube, which are usually round,Silicone Laryngeal Mask. The number of holes in the spinneret determines the size of the yarn,Respiratory Care.
• 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,Shower Accessories. 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,Classic Shower Set.
• Flat Shower Set,Stainless Steel Chrome-plated Shower Set. Also,Classic Electroplating Shower Set,Retractable Round Shower Rod Set.

Winding

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

Round Shower Set

Round Shower Rail, 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,Shower Rail. The rope-Stainless Steel Polished Shower Hose.

Drawing tow

• 1 Newly-S.S. Shower Hose.Shower Hose.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Large Round Head Shower.ABS Plastic Round Head Shower.

Cutting

• 4 Following heat setting,Classic Plating Overhead Shower. 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)Waterfall Head Shower.Electroplating Square Head Shower, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Yellow Square Head Shower.

The Future

Temperature Control LED Shower Head,LED Shower Head's fastest-growing fiber.Square Waterfall Small Top 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,Small Top Shower Head, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,ABS Plastic Five-Function Hand Shower. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Household Five-Function Handheld Shower, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.