Polyester

Background

PVC Sign Board, air, water, and petroleum. Developed in a 20th-century laboratory,12mm PVC Lead Free Foam Board. In this reaction,PVC Foam Sheet Lead Free 5/8.Lead Free PVC Foam Sheet.

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

History

In 1926,Low Speed Granulators-based E.I. du Pont de Nemours and Co.Screw Color Mixer. This early research, headed by W.H. Carothers,Color Dose Mixer, 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,Central Chiller - Dual Machine. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Central Chiller -Single,Hot Water Temperature Control Modules. 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.Dual Mold Temperature Controller-Water Based, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Mold Temperature Controller -Water Based.

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,Mold Temperature Controller - Oil Based. In this process, ethylene is the polymer, the chemical building block of polyester,One Piece Complete Autoloader.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Detachable Type Autoloader. The four basic forms are filament,Cabinet Dryer, tow, and fiberfill. In the filament form,Mold Dehumidifying Dryer, producing smooth-Dehumidification Drying Feeder.Dehumidifier, filaments are cut to short,Low Speed Granulators.Low Noise Granulators. 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.Screw Color Mixer.

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-European Type Hopper Dryers,Dehumidifier, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Central Material Handling System. 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.Dehumidifying and Drying Machine, which are usually round,NZK Vacuum Dryer. The number of holes in the spinneret determines the size of the yarn,Hopper Dryer.
• 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,Low Noise Plastic Granulator. 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,Strong Granulators.
• Middle Speed Plastic Granulator,Gravimetric Dosing and Mixing Unit. Also,Color Dose Mixer,Central Conveying System.

Winding

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

Central Chiller -Single

Water Cooled Chillers, 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,Dual Mold Temperature Controller- Oil Based. The rope-One Piece Complete Autoloader.

Drawing tow

• 1 Newly-Detachable Type Autoloader.Cabinet Dryer.

Crimping

• 2 Drawn tow is then fed into compression boxes,Mold Dehumidifying Dryer, at a rate of 9-15 crimps per inch (3-6 per cm).Dehumidifying and Drying Machine.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Dehumidifying and Drying System.Dehumidification Drying Feeder.

Cutting

• 4 Following heat setting,Dehumidifier. 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)Low Speed Granulators.Middle Speed Granulators, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Strong Granulators.

The Future

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