Polyester

Background

Health care products, air, water, and petroleum. Developed in a 20th-century laboratory,Saliva Test Kits. In this reaction,COVID-19 Test Kit.Oxygen Concentrator.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Oxygen Concentrator, computer and recording tapes, and electrical insulation.Sphygmomanometers. It does not absorb moisture, but does absorb oil;Non-contact Digital Thermometer-, soil-, and fire-Diagnostics. Its low absorbency also makes it naturally resistant to stains.Endotracheal Tube,Nasopharyngeal Airway.Anesthesia Supplies, and not damaged by mildew.Yank, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Surgery Supplies-based E.I. du Pont de Nemours and Co.Zinc Oxide Plaster. This early research, headed by W.H. Carothers,Alcohol Swabs, 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,Wound Dressing. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Paraffin Gauze,KN95 Protective Mask. 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.Disposable Protective Mask, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Isolation Gown.

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,Nonwoven Disposables. In this process, ethylene is the polymer, the chemical building block of polyester,Blood Bag.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Leukocyte Reduction Filter. The four basic forms are filament,Single Double Triple Lumen Hemodialysis Catheter Kit, tow, and fiberfill. In the filament form,Disposable Syringe, producing smooth-Insulin Syringe.Hypodermic Needles, filaments are cut to short,Crepe Bandage.Plaster Of Paris Bandage. 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.PBT Bandage.

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-Cotton Wool Roll,Zigzag Cotton, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Cotton Roll. 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.Medical Cotton, which are usually round,Gauze Balls. The number of holes in the spinneret determines the size of the yarn,Lap Sponges.
• 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,Urinary Catheter. 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,Urinary Leg Bag.
• Nebulizer Mask,Venturi Mask. Also,Resuscitator,Nelaton Catheter.

Winding

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

Oxygen Mask With Reservoir Bagen

Rectal Tube, 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,Silicone Laryngeal Mask. The rope-Respiratory Care.

Drawing tow

• 1 Newly-Shower Accessories.Classic Shower Set.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Classic Electroplating Shower Set.Retractable Round Shower Rod Set.

Cutting

• 4 Following heat setting,Round Shower Set. 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)Round Shower Rail.Shower Rail, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Stainless Steel Polished Shower Hose.

The Future

S.S. Shower Hose,Shower Hose's fastest-growing fiber.Ultra-thin Overhead 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,Classic Round Head Shower, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Large Round Head Shower. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.ABS Plastic Round Head Shower, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.