Polyester

Background

Galvanized europe type large bow shackle, air, water, and petroleum. Developed in a 20th-century laboratory,Galvanized Screw Pin Anchor Shackle G210. In this reaction,Forged Eye Bolt.Hot forged eye bolt.

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

History

In 1926,Fixing Socket Dowel With Hole-based E.I. du Pont de Nemours and Co.Fixing Socket With Hole. This early research, headed by W.H. Carothers,Lifting Socket With Cross, 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,Galvanized Lifting Socket With Cross Hole. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Double Head Lifting Anchor,Lifting Foot Anchor. 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.Rebar Lifting Foot Anchor, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.2000KVA Isolation Transformer.

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,1400KVA Isolation Transformer. In this process, ethylene is the polymer, the chemical building block of polyester,1200KVA Isolation Transformer.

The Manufacturing
Process

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

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-free Chinese course,Chinese pinyin, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,free Chinese course online. 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.learn Mandarin, which are usually round,free learn Chinese online. The number of holes in the spinneret determines the size of the yarn,Beginner Chinese for HSK 1 .
• 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,learning Chinese. 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,learn Chinese.
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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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free Mandarin course, 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,learning Chinese. The rope-free Mandarin course.

Drawing tow

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Crimping

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

Setting

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

Cutting

• 4 Following heat setting,free Chinese course. 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)Chinese online 1-to-1 course.Chinese course HSK 2, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Chinese video courses.

The Future

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