Polyester

Background

Paraffin Gauze, air, water, and petroleum. Developed in a 20th-century laboratory,KN95 Protective Mask. In this reaction,Disposable Protective Mask.Isolation Gown.

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

History

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

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,Urinary Catheter. In this process, ethylene is the polymer, the chemical building block of polyester,Urinary Leg Bag.

The Manufacturing
Process

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

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-Shower Accessories,Classic Shower Set, is extruded through a slot to form long ribbons.

Drying

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

Winding

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

Ultra-thin Overhead Shower

Classic 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,Large Round Head Shower. The rope-ABS Plastic Round Head Shower.

Drawing tow

• 1 Newly-Classic Plating Overhead Shower.Waterfall Head Shower.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Temperature Control LED Shower Head.LED Shower Head.

Cutting

• 4 Following heat setting,Square Waterfall Small Top Shower Head. 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)Small Top Shower Head.ABS Plastic Five-Function Hand Shower, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Household Five-Function Handheld Shower.

The Future

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