Polyester

Background

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

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

History

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

The Manufacturing
Process

Polyester is manufactured by one of several methods.2-8 Degrees Glass Door Pharmacy Vaccine Refrigerator. The four basic forms are filament,Visible Display Pharmacy Refrigerator , tow, and fiberfill. In the filament form,Mini Display Pharmacy Refrigerator , producing smooth-Small Display Pharmacy Refrigerator .Display Medical Refrigerator, filaments are cut to short,Display Vaccine Refrigerator .Big 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.Vaccine 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-Display Medical Pharmacy Fridge ,Glass Door Display Fridge , is extruded through a slot to form long ribbons.

Drying

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

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 Zinc Plated Hollow Wall Anchor with O Hook

Hollow Wall Anchor, 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,Carnon Steel Yellow Zinc Plated Express Nail. The rope-Mushroom Head Stainless Steel Pin.

Drawing tow

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

Crimping

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

Setting

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

Cutting

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

The Future

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