Polyester

Background

Chest Deep Low Laboratory Refrigerators, air, water, and petroleum. Developed in a 20th-century laboratory,4 Degree Display Laboratory Refrigerator. In this reaction,Laboratory Refrigerator.Deep Cryogenic Car Freezer.

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

History

In 1926,Ultra Deep Cold Temperature Freezer -based E.I. du Pont de Nemours and Co.Cold Medical Freezer. This early research, headed by W.H. Carothers,Ultra Low Temperature Medical Freezer , 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,Upright Ultra-Low Cryogenic Freezer. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Mini Chest Deep Low Temp Refrigerator,So-cold Temp Medical Freezer. 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.Chest Ultra-Low Cryogenic Freezer, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Ultra-Low Cryogenic Freezer.

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,Temperature Controlled Shakers. In this process, ethylene is the polymer, the chemical building block of polyester,2-8 Degrees Glass Door Pharmacy Vaccine Refrigerator.

The Manufacturing
Process

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

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-Glass Door Display Fridge ,Big Display Fridge , is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Mini Blood Bank Refrigerator . 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.Display Blood Bank Refrigerator , which are usually round,Big Blood Bank Refrigerator . The number of holes in the spinneret determines the size of the yarn,Medical Refrigerator.
• 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,Carbon Steel Yellow Zinc Plated Hit Anchor with Flange Nut. 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,Carbon Steel Yellow Zinc Plated Pin Anchor with Conical Washer.
• Hit Anchor,Shield Anchor. Also,Carbon Steel Zinc Plated Hollow Wall Anchor,Carbon Steel Zinc Plated Hollow Wall Anchor with O Hook.

Winding

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

Hollow Wall Anchor

Carnon Steel Yellow Zinc Plated Express Nail, 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,Mushroom Head Stainless Steel Pin. The rope-Stainless Steel Round Coupling Nut.

Drawing tow

• 1 Newly-Stainless Steel Hex Coupling Nut with Holes.Coupling Nut.

Crimping

• 2 Drawn tow is then fed into compression boxes,Carbon Steel Yellow Zinc Plated Cut Anchor with Knurling, at a rate of 9-15 crimps per inch (3-6 per cm).Stainless Steel Drop in Anchor with Knurling and Lip.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Carbon Steel Yellow Zinc Plated Drop in Anchor with Knurling.Carbon Steel Bluewhite Zinc Plated Drop in Anchor with Knurling.

Cutting

• 4 Following heat setting,Stainless Steel Drop in Anchor Without Knurling. 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)Drop in Anchor.Stainless Steel Chemical Anchor with Hex Nut and Washer, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Carbon Steel Zinc Plated Chemical Anchor.

The Future

Carbon Steel Hot Dip Galvanized HDG Chemical Anchor,Chemical Anchor's fastest-growing fiber.Stainless Steel Sleeve Anchor with Hex Nut and Flat Washer. 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,Stainless Steel Sleeve Anchor with Fish Fins, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Carbon Steel Zinc Plated Sleeve Anchor with Conical Nut and O Hook. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Carbon Steel Bulewhite Zinc Plated Sleeve Anchor with Flange Nut, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.