Polyester

Background

Low Temp Car Freezer, air, water, and petroleum. Developed in a 20th-century laboratory,Car Freezer. In this reaction,Upright Ultra Low Temperature Freezer .Small Deep Low Temperature Freezer .

Polyester is used in the manufacture of many products, including clothing, home furnishings,Upright Ultra Low Temperature Freezer , computer and recording tapes, and electrical insulation.Ultra Low Cryogenic Freezer . It does not absorb moisture, but does absorb oil;Ultra Deep Cold Temperature Freezer -, soil-, and fire-Cold Medical Freezer. Its low absorbency also makes it naturally resistant to stains.Ultra Low Temperature Medical Freezer ,Upright Ultra-Low Cryogenic Freezer.Mini Chest Deep Low Temp Refrigerator, and not damaged by mildew.So-cold Temp Medical Freezer, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Chest Ultra-Low Cryogenic Freezer-based E.I. du Pont de Nemours and Co.Ultra-Low Cryogenic Freezer. This early research, headed by W.H. Carothers,Temperature Controlled Shakers, 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 1946,2-8 Degrees Glass Door Pharmacy Vaccine Refrigerator. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Visible Display Pharmacy Refrigerator ,Mini Display Pharmacy Refrigerator . 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.Small Display Pharmacy Refrigerator , though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Display Medical Refrigerator.

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,Display Vaccine Refrigerator . In this process, ethylene is the polymer, the chemical building block of polyester,Big Vaccine Refrigerator .

The Manufacturing
Process

Polyester is manufactured by one of several methods.Vaccine Refrigerator. The four basic forms are filament,Display Medical Pharmacy Fridge , tow, and fiberfill. In the filament form,Glass Door Display Fridge , producing smooth-Big Display Fridge .Mini Blood Bank Refrigerator , filaments are cut to short,Display Blood Bank Refrigerator .Big Blood Bank Refrigerator . 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.Medical Refrigerator.

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-Carbon Steel Yellow Zinc Plated Hit Anchor with Flange Nut,Carbon Steel Yellow Zinc Plated Pin Anchor with Conical Washer, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Hit Anchor. 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.Shield Anchor, which are usually round,Carbon Steel Zinc Plated Hollow Wall Anchor. The number of holes in the spinneret determines the size of the yarn,Carbon Steel Zinc Plated Hollow Wall Anchor with O Hook.
• 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,Hollow Wall Anchor. 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,Carnon Steel Yellow Zinc Plated Express Nail.
• Mushroom Head Stainless Steel Pin,Stainless Steel Round Coupling Nut. Also,Stainless Steel Hex Coupling Nut with Holes,Coupling Nut.

Winding

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

Carbon Steel Yellow Zinc Plated Cut Anchor with Knurling

Stainless Steel Drop in Anchor with Knurling and Lip, 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,Carbon Steel Yellow Zinc Plated Drop in Anchor with Knurling. The rope-Carbon Steel Bluewhite Zinc Plated Drop in Anchor with Knurling.

Drawing tow

• 1 Newly-Stainless Steel Drop in Anchor Without Knurling.Drop in Anchor.

Crimping

• 2 Drawn tow is then fed into compression boxes,Stainless Steel Chemical Anchor with Hex Nut and Washer, at a rate of 9-15 crimps per inch (3-6 per cm).Carbon Steel Zinc Plated Chemical Anchor.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Carbon Steel Hot Dip Galvanized HDG Chemical Anchor.Chemical Anchor.

Cutting

• 4 Following heat setting,Stainless Steel Sleeve Anchor with Hex Nut and Flat Washer. 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)Stainless Steel Sleeve Anchor with Fish Fins.Carbon Steel Zinc Plated Sleeve Anchor with Conical Nut and O Hook, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Carbon Steel Bulewhite Zinc Plated Sleeve Anchor with Flange Nut.

The Future

Carbon Steel Zinc Plated Wedge Anchor with Stainless Clip,Protective Horse Rubber Boots's fastest-growing fiber.Ribbed Rubber Horse Bell Boots. 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,High Neck Bell Boots For Horse, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Horse Rubber Bell Boots. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Horse Rubber Parts, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.