Polyester

Background

Expanded PTFE Sheet, air, water, and petroleum. Developed in a 20th-century laboratory,EXPANDED PTFE SHEET. In this reaction,EPDM rubber.Natural Rubber Insertion.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Neoprene Rubber, computer and recording tapes, and electrical insulation.Nitrile Rubber. It does not absorb moisture, but does absorb oil;RUBBE SHEET-, soil-, and fire-Flange gaskets. Its low absorbency also makes it naturally resistant to stains.FLANGE GASKETS,Rubber gaskets and seals.GRAPHITE GASKETS AND SEALS, and not damaged by mildew.BX Ring Joint Gasket, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,BX RING JOINT GASKET-based E.I. du Pont de Nemours and Co.RX RING JOINT GASKET. This early research, headed by W.H. Carothers,GASKET, 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,Magnetic Socks，magnetic compression socks，magnetic therapy socks. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Mens Socks | Trainer,Health care products. 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.Saliva Test Kits, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.COVID-19 Test Kit.

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,Oxygen Concentrator. In this process, ethylene is the polymer, the chemical building block of polyester,Oxygen Concentrator.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Sphygmomanometers. The four basic forms are filament,Non-contact Digital Thermometer, tow, and fiberfill. In the filament form,Diagnostics, producing smooth-Endotracheal Tube.Nasopharyngeal Airway, filaments are cut to short,Anesthesia Supplies.Yank. 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.Surgery Supplies.

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-Zinc Oxide Plaster,Alcohol Swabs, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Wound Dressing. 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.Paraffin Gauze, which are usually round,KN95 Protective Mask. The number of holes in the spinneret determines the size of the yarn,Disposable Protective Mask.
• 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,Isolation Gown. 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,Nonwoven Disposables.
• Blood Bag,Leukocyte Reduction Filter. Also,Single Double Triple Lumen Hemodialysis Catheter Kit,Disposable Syringe.

Winding

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

Insulin Syringe

Hypodermic Needles, 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,Crepe Bandage. The rope-Plaster Of Paris Bandage.

Drawing tow

• 1 Newly-PBT Bandage.Cotton Wool Roll.

Crimping

• 2 Drawn tow is then fed into compression boxes,Zigzag Cotton, at a rate of 9-15 crimps per inch (3-6 per cm).Cotton Roll.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Medical Cotton.Gauze Balls.

Cutting

• 4 Following heat setting,Lap Sponges. 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)Urinary Catheter.Urinary Leg Bag, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Nebulizer Mask.

The Future

Venturi Mask,Resuscitator's fastest-growing fiber.Nelaton Catheter. 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,Oxygen Mask With Reservoir Bagen, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Rectal Tube. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Silicone Laryngeal Mask, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.