Polyester

Background

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

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

History

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

The Manufacturing
Process

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

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-Nebulizer Mask,Venturi Mask, is extruded through a slot to form long ribbons.

Drying

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

Classic Electroplating Shower Set

Retractable Round Shower Rod 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,Round Shower Set. The rope-Round Shower Rail.

Drawing tow

• 1 Newly-Shower Rail.Stainless Steel Polished Shower Hose.

Crimping

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

Setting

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

Cutting

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

The Future

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