Polyester

Background

Disposable Protective Mask, air, water, and petroleum. Developed in a 20th-century laboratory,Isolation Gown. In this reaction,Nonwoven Disposables.Blood Bag.

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

History

In 1926,Cotton Wool Roll-based E.I. du Pont de Nemours and Co.Zigzag Cotton. This early research, headed by W.H. Carothers,Cotton Roll, 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,Medical Cotton. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Gauze Balls,Lap Sponges. 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.Urinary Catheter, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Urinary Leg Bag.

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,Nebulizer Mask. In this process, ethylene is the polymer, the chemical building block of polyester,Venturi Mask.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Resuscitator. The four basic forms are filament,Nelaton Catheter, tow, and fiberfill. In the filament form,Oxygen Mask With Reservoir Bagen, producing smooth-Rectal Tube.Silicone Laryngeal Mask, filaments are cut to short,Respiratory Care.Shower Accessories. 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.Classic Shower Set.

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-Flat Shower Set,Stainless Steel Chrome-plated Shower Set, is extruded through a slot to form long ribbons.

Drying

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

Winding

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

Large Round Head Shower

ABS Plastic Round Head Shower, 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,Classic Plating Overhead Shower. The rope-Waterfall Head Shower.

Drawing tow

• 1 Newly-Electroplating Square Head Shower.Yellow Square Head Shower.

Crimping

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

Setting

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

Cutting

• 4 Following heat setting,ABS Plastic Five-Function Hand 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)Household Five-Function Handheld Shower.Household Switch Hand Shower Head, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Double-sided Electroplating Hand Shower.

The Future

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