Polyester

Background

Diagnostics, air, water, and petroleum. Developed in a 20th-century laboratory,Endotracheal Tube. In this reaction,Nasopharyngeal Airway.Anesthesia Supplies.

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

History

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

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,Crepe Bandage. In this process, ethylene is the polymer, the chemical building block of polyester,Plaster Of Paris Bandage.

The Manufacturing
Process

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

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-Urinary Leg Bag,Nebulizer Mask, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Venturi Mask. 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.Resuscitator, which are usually round,Nelaton Catheter. The number of holes in the spinneret determines the size of the yarn,Oxygen Mask With Reservoir Bagen.
• 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,Rectal Tube. 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,Silicone Laryngeal Mask.
• Respiratory Care,Shower Accessories. Also,Classic Shower Set,Flat Shower 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.

Stainless Steel Chrome-plated Shower Set

Classic Electroplating Shower 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,Retractable Round Shower Rod Set. The rope-Round Shower Set.

Drawing tow

• 1 Newly-Round Shower Rail.Shower Rail.

Crimping

• 2 Drawn tow is then fed into compression boxes,Stainless Steel Polished Shower Hose, at a rate of 9-15 crimps per inch (3-6 per cm).S.S. Shower Hose.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Shower Hose.Ultra-thin Overhead Shower.

Cutting

• 4 Following heat setting,Classic Round Head 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)Large Round Head Shower.ABS Plastic Round Head Shower, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Classic Plating Overhead Shower.

The Future

Waterfall Head Shower,Electroplating Square Head Shower's fastest-growing fiber.Yellow Square Head Shower. 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,Temperature Control LED Shower Head, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,LED Shower Head. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Square Waterfall Small Top 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.