Polyester

Background

Insulin Syringe, air, water, and petroleum. Developed in a 20th-century laboratory,Hypodermic Needles. In this reaction,Crepe Bandage.Plaster Of Paris Bandage.

Polyester is used in the manufacture of many products, including clothing, home furnishings,PBT Bandage, computer and recording tapes, and electrical insulation.Cotton Wool Roll. It does not absorb moisture, but does absorb oil;Zigzag Cotton-, soil-, and fire-Cotton Roll. Its low absorbency also makes it naturally resistant to stains.Medical Cotton,Gauze Balls.Lap Sponges, and not damaged by mildew.Urinary Catheter, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Urinary Leg Bag-based E.I. du Pont de Nemours and Co.Nebulizer Mask. This early research, headed by W.H. Carothers,Venturi Mask, 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,Resuscitator. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Nelaton Catheter,Oxygen Mask With Reservoir Bagen. 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.Rectal Tube, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Silicone Laryngeal Mask.

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,Respiratory Care. In this process, ethylene is the polymer, the chemical building block of polyester,Shower Accessories.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Classic Shower Set. The four basic forms are filament,Flat Shower Set, tow, and fiberfill. In the filament form,Stainless Steel Chrome-plated Shower Set, producing smooth-Classic Electroplating Shower Set.Retractable Round Shower Rod Set, filaments are cut to short,Round Shower Set.Round Shower Rail. 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.Shower Rail.

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-Stainless Steel Polished Shower Hose,S.S. Shower Hose, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Shower Hose. 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.Ultra-thin Overhead Shower, which are usually round,Classic Round Head Shower. The number of holes in the spinneret determines the size of the yarn,Large Round Head Shower.
• 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,ABS Plastic Round Head Shower. 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,Classic Plating Overhead Shower.
• Waterfall Head Shower,Electroplating Square Head Shower. Also,Yellow Square Head Shower,Temperature Control LED Shower Head.

Winding

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

LED Shower Head

Square Waterfall Small Top Shower Head, 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,Small Top Shower Head. The rope-ABS Plastic Five-Function Hand Shower.

Drawing tow

• 1 Newly-Household Five-Function Handheld Shower.Household Switch Hand Shower Head.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Round Hand Shower Head.Large Size Five-function Hand Shower.

Cutting

• 4 Following heat setting,Single Function Round Hand 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)Electroplating Hand Shower Head.Large Size Hand Shower Head, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Large Size Five-function Hand Shower Head.

The Future

Five-function Chrome Hand Shower,Three-function Hand Shower Head's fastest-growing fiber.Clear comsetic bag. 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,Toiletry Bag, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Make Up Brush Holder. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Cute Cosmetic pouch, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.