Polyester

Background

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Polyester is used in the manufacture of many products, including clothing, home furnishings,Galvanized Screw Pin Anchor Shackle G210, computer and recording tapes, and electrical insulation.Forged Eye Bolt. It does not absorb moisture, but does absorb oil;Hot forged eye bolt-, soil-, and fire-Eye Bolt. Its low absorbency also makes it naturally resistant to stains.Rigging Hardware,Magnetic Recess Former.Cast In Loop, and not damaged by mildew.Lifting loop with plastic card, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Erection Anchor A-based E.I. du Pont de Nemours and Co.Galvanized erection anchor. This early research, headed by W.H. Carothers,Lifting Socket With Foot, 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,Fixing Socket Dowel With Hole. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Fixing Socket With Hole,Lifting Socket With Cross. 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.Galvanized Lifting Socket With Cross Hole, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Double Head Lifting Anchor.

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,Lifting Foot Anchor. In this process, ethylene is the polymer, the chemical building block of polyester,Rebar Lifting Foot Anchor.

The Manufacturing
Process

Polyester is manufactured by one of several methods.2000KVA Isolation Transformer. The four basic forms are filament,1400KVA Isolation Transformer, tow, and fiberfill. In the filament form,1200KVA Isolation Transformer, producing smooth-Naked Single Phase Auto Transformer.With Indoor Enclosure Single Phase Auto Transformer, filaments are cut to short,Outdoor Use SCR Modular Type Static Single Phase Voltage Stabilizer.3KVA-80KVA SCR Modular Type Static Single Phase Voltage Stabilizer. 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.Coil Type Servo Single Phase Voltage Stabilizer.

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-Single Phase Voltage Stabilizer,Chinese class online, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,free Mandarin course. 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.free Chinese course, which are usually round,Chinese pinyin. The number of holes in the spinneret determines the size of the yarn,free Chinese course online.
• 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,learn Mandarin. 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,free learn Chinese online.
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Winding

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

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best way to learn Chinese, 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,learn Chinese. The rope-Chinese reading material.

Drawing tow

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Crimping

• 2 Drawn tow is then fed into compression boxes,free Mandarin course, at a rate of 9-15 crimps per inch (3-6 per cm).best way to learn Chinese.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)online Chinese language school.free learning Chinese online.

Cutting

• 4 Following heat setting,learn Chinese online. 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)free learn Chinese online.free Mandarin course, such ascarpet,polyester filaments are cut into 6 inch (15 cm)free Chinese course.

The Future

Chinese online 1-to-1 course,Chinese course HSK 2's fastest-growing fiber.Chinese video courses. 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,SJTU Pre-University Program, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Chinese Reading Materials. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Mobile Phone WIFI GPS Signal Detector for Car Meeting Room Conference, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.