Polyester

Background

Low Density PVC Free Foam Board, air, water, and petroleum. Developed in a 20th-century laboratory,PVC Foam Sheet. In this reaction,Low Noise Plastic Granulator.Mid Speed Granulator.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Middle Speed Plastic Granulator, computer and recording tapes, and electrical insulation.Low Speed Granulators. It does not absorb moisture, but does absorb oil;Screw Color Mixer-, soil-, and fire-Color Dose Mixer. Its low absorbency also makes it naturally resistant to stains.Central Chiller - Dual Machine,Central Chiller -Single.Hot Water Temperature Control Modules, and not damaged by mildew.Dual Mold Temperature Controller-Water Based, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Mold Temperature Controller -Water Based-based E.I. du Pont de Nemours and Co.Mold Temperature Controller - Oil Based. This early research, headed by W.H. Carothers,One Piece Complete Autoloader, 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,Detachable Type Autoloader. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Cabinet Dryer,Mold Dehumidifying Dryer. 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.Dehumidification Drying Feeder, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Dehumidifier.

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,Low Speed Granulators. In this process, ethylene is the polymer, the chemical building block of polyester,Low Noise Granulators.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Screw Color Mixer. The four basic forms are filament,European Type Hopper Dryers, tow, and fiberfill. In the filament form,Dehumidifier, producing smooth-Central Material Handling System.Dehumidifying and Drying Machine, filaments are cut to short,NZK Vacuum Dryer.Hopper 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.Low Noise Plastic Granulator.

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-Strong Granulators,Middle Speed Plastic Granulator, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Gravimetric Dosing and Mixing Unit. 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.Color Dose Mixer, which are usually round,Central Conveying System. The number of holes in the spinneret determines the size of the yarn,Central Chiller -Single.
• 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,Water Cooled Chillers. 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,Dual Mold Temperature Controller- Oil Based.
• One Piece Complete Autoloader,Detachable Type Autoloader. Also,Cabinet Dryer,Mold Dehumidifying Dryer.

Winding

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

Dehumidifying and Drying Machine

Dehumidifying and Drying System, 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,Dehumidification Drying Feeder. The rope-Dehumidifier.

Drawing tow

• 1 Newly-Low Speed Granulators.Middle Speed Granulators.

Crimping

• 2 Drawn tow is then fed into compression boxes,Strong Granulators, at a rate of 9-15 crimps per inch (3-6 per cm).Vertical Color Mixer.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Central Conveying System.Mixer.

Cutting

• 4 Following heat setting,Mold Temperature Controller-Water Based. 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)Dual Mold Temperature Controller-Water Based.Central Chiller Dual Machine, such ascarpet,polyester filaments are cut into 6 inch (15 cm)TCOD Oil Type Mold Temperature Machine.

The Future

TCHW A cold and hot integrated temperature controller,Heating and Cooling's fastest-growing fiber.Self Contained Vacuum Hopper Loaders. 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,Detachable Type Autoloader, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,European Type Hopper Dryers. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Dehumidification Drying Feeder, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.