Polyester

Background

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

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

History

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

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

The Manufacturing
Process

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

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-Nelaton Catheter,Oxygen Mask With Reservoir Bagen, is extruded through a slot to form long ribbons.

Drying

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

Round Shower Rail

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,Stainless Steel Polished Shower Hose. The rope-S.S. Shower Hose.

Drawing tow

• 1 Newly-Shower Hose.Ultra-thin Overhead Shower.

Crimping

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

Setting

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

Cutting

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

The Future

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