Polyester

Background

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

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

History

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

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,Blood Bag. In this process, ethylene is the polymer, the chemical building block of polyester,Leukocyte Reduction Filter.

The Manufacturing
Process

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

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

Drying

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

Winding

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

Rectal Tube

Silicone Laryngeal Mask, 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,Respiratory Care. The rope-Shower Accessories.

Drawing tow

• 1 Newly-Classic Shower Set.Flat Shower Set.

Crimping

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

Setting

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

Cutting

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

The Future

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