Polyester

Background

Upright Ultra Low Temperature Freezer , air, water, and petroleum. Developed in a 20th-century laboratory,Ultra Low Cryogenic Freezer . In this reaction,Ultra Deep Cold Temperature Freezer .Cold Medical Freezer.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Ultra Low Temperature Medical Freezer , computer and recording tapes, and electrical insulation.Upright Ultra-Low Cryogenic Freezer. It does not absorb moisture, but does absorb oil;Mini Chest Deep Low Temp Refrigerator-, soil-, and fire-So-cold Temp Medical Freezer. Its low absorbency also makes it naturally resistant to stains.Chest Ultra-Low Cryogenic Freezer,Ultra-Low Cryogenic Freezer.Temperature Controlled Shakers, and not damaged by mildew.2-8 Degrees Glass Door Pharmacy Vaccine Refrigerator, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Visible Display Pharmacy Refrigerator -based E.I. du Pont de Nemours and Co.Mini Display Pharmacy Refrigerator . This early research, headed by W.H. Carothers,Small Display Pharmacy Refrigerator , 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,Display Medical Refrigerator. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Display Vaccine Refrigerator ,Big Vaccine 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.Vaccine Refrigerator, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Display Medical Pharmacy Fridge .

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,Glass Door Display Fridge . In this process, ethylene is the polymer, the chemical building block of polyester,Big Display Fridge .

The Manufacturing
Process

Polyester is manufactured by one of several methods.Mini Blood Bank Refrigerator . The four basic forms are filament,Display Blood Bank Refrigerator , tow, and fiberfill. In the filament form,Big Blood Bank Refrigerator , producing smooth-Medical Refrigerator.Carbon Steel Yellow Zinc Plated Hit Anchor with Flange Nut, filaments are cut to short,Carbon Steel Yellow Zinc Plated Pin Anchor with Conical Washer.Hit Anchor. 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.Shield Anchor.

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 Zinc Plated Hollow Wall Anchor,Carbon Steel Zinc Plated Hollow Wall Anchor with O Hook, is extruded through a slot to form long ribbons.

Drying

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

Winding

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

Stainless Steel Drop in Anchor Without Knurling

Drop in 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,Stainless Steel Chemical Anchor with Hex Nut and Washer. The rope-Carbon Steel Zinc Plated Chemical Anchor.

Drawing tow

• 1 Newly-Carbon Steel Hot Dip Galvanized HDG Chemical Anchor.Chemical Anchor.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Carbon Steel Zinc Plated Sleeve Anchor with Conical Nut and O Hook.Carbon Steel Bulewhite Zinc Plated Sleeve Anchor with Flange Nut.

Cutting

• 4 Following heat setting,Carbon Steel Zinc Plated Wedge Anchor with Stainless Clip. 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)Protective Horse Rubber Boots.Ribbed Rubber Horse Bell Boots, such ascarpet,polyester filaments are cut into 6 inch (15 cm)High Neck Bell Boots For Horse.

The Future

Horse Rubber Bell Boots,Horse Rubber Parts's fastest-growing fiber.Custom Rubber Gaskets. 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,Rubber Dust Cover, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Gear Shift Lever Boot. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Auto Rubber Engine Mounting, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.