Polyester

Background

PVC Forex Sheet, air, water, and petroleum. Developed in a 20th-century laboratory,High Gloss Laminated Board. In this reaction,PVC Rigid Board Furniture.PVC Celluka Board.

Polyester is used in the manufacture of many products, including clothing, home furnishings,PVC Sign Board, computer and recording tapes, and electrical insulation.12mm PVC Lead Free Foam Board. It does not absorb moisture, but does absorb oil;PVC Foam Sheet Lead Free 5/8-, soil-, and fire-Lead Free PVC Foam Sheet. Its low absorbency also makes it naturally resistant to stains.White PVC Foam Sheet,PVC Free Foam Sheet.Colors PVC Foam Board, and not damaged by mildew.Low Density PVC Free Foam Board, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,PVC Foam Sheet-based E.I. du Pont de Nemours and Co.Low Noise Plastic Granulator. This early research, headed by W.H. Carothers,Mid Speed Granulator, 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,Middle Speed Plastic Granulator. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Low Speed Granulators,Screw Color Mixer. 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.Color Dose Mixer, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Central Chiller - Dual Machine.

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,Central Chiller -Single. In this process, ethylene is the polymer, the chemical building block of polyester,Hot Water Temperature Control Modules.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Dual Mold Temperature Controller-Water Based. The four basic forms are filament,Mold Temperature Controller -Water Based, tow, and fiberfill. In the filament form,Mold Temperature Controller - Oil Based, producing smooth-One Piece Complete Autoloader.Detachable Type Autoloader, filaments are cut to short,Cabinet Dryer.Mold Dehumidifying Dryer. 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.Dehumidification Drying Feeder.

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-Dehumidifier,Low Speed Granulators, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Low Noise Granulators. 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.Screw Color Mixer, which are usually round,European Type Hopper Dryers. The number of holes in the spinneret determines the size of the yarn,Dehumidifier.
• 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,Central Material Handling System. 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,Dehumidifying and Drying Machine.
• NZK Vacuum Dryer,Hopper Dryer. Also,Low Noise Plastic Granulator,Strong Granulators.

Winding

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

Middle Speed Plastic Granulator

Gravimetric Dosing and Mixing Unit, 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,Color Dose Mixer. The rope-Central Conveying System.

Drawing tow

• 1 Newly-Central Chiller -Single.Water Cooled Chillers.

Crimping

• 2 Drawn tow is then fed into compression boxes,Dual Mold Temperature Controller- Oil Based, at a rate of 9-15 crimps per inch (3-6 per cm).One Piece Complete Autoloader.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Detachable Type Autoloader.Cabinet Dryer.

Cutting

• 4 Following heat setting,Mold Dehumidifying Dryer. 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)Dehumidifying and Drying Machine.Dehumidifying and Drying System, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Dehumidification Drying Feeder.

The Future

Dehumidifier,Low Speed Granulators's fastest-growing fiber.Middle Speed Granulators. 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,Strong Granulators, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Vertical Color Mixer. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Central Conveying System, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.