Polyester

Background

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

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

History

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

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

The Manufacturing
Process

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

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

Drying

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

Square Waterfall Small Top Shower Head

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,ABS Plastic Five-Function Hand Shower. The rope-Household Five-Function Handheld Shower.

Drawing tow

• 1 Newly-Household Switch Hand Shower Head.Double-sided Electroplating Hand Shower.

Crimping

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

Setting

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

Cutting

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

The Future

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