Polyester

Background

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Polyester is used in the manufacture of many products, including clothing, home furnishings,Gas Safety Valve Assembly Big Solenoid, computer and recording tapes, and electrical insulation.Top Time Thermocouple Safety Protection Solenoid Valve. It does not absorb moisture, but does absorb oil;Gas Solenoid Valve for Oven-, soil-, and fire-Safety Control Gas Magnet Valve. Its low absorbency also makes it naturally resistant to stains.Gas Stove Burner Igniter Parts Magnet Unit Valve,Self Pulling on Gas Solenoid Magnet Valve for All Appliances Safety Protector.Universal Gas Sensor Magnet Valve for Heater, and not damaged by mildew.Gas Boiler Magnetic Valve for Oven, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Electoral Magnet valve-based E.I. du Pont de Nemours and Co.Gas Fireplace Magnet Valve. This early research, headed by W.H. Carothers,Solenoid Valve BBQ, 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,Nickel Alloy Orkli Thermocouple Head. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Spare Parts Stove Thermocouple,Gas Fireplace Temperature Sensor Thermocouple. 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.Gas Cooker Thermopile Sensors, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.Gas Barbecue Thermocouple for Home Appliance.

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,Gas Barbecue Thermocouple for Kitchenware. In this process, ethylene is the polymer, the chemical building block of polyester,Brass Wire Thermocouple Flame Sensor for Gas Oven.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Flexible Thermocouple. The four basic forms are filament,Gas Thermocouple, tow, and fiberfill. In the filament form,Thermocouple for Gas Oven, producing smooth-Gas Magnet Valve for Flame Failure Device.Magnet Valve, filaments are cut to short,Electromagnetic Valves.Bottle Cap Printer Machine. 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.SMC Sheet Automatic Cutter Machine.

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-SMC Sheet Cutting Machine,Cap assembling Machine For Add Aluminium Foil, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Flip Top Cap Assembling Machine. 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.Press Cap Assembling Machine, which are usually round,Push Pull Cap Assembling Machine. The number of holes in the spinneret determines the size of the yarn,Sport Cap Assembling Machine.
• 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,Bottle Cap Assembling Machine. 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,Auto Cap Liner Machine.
• Aluminium Foil Cap Liner Machine,Easy Operation Cap liner Machine. Also,Cap Liner Machine For Add Gasket,Plastic Cap Liner Machine.

Winding

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

Bottle Cap Liner Machine

High Speed Cap Slitting Folding Machine, 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,38mm Mineral Water Cap Folding Slitting Machine. The rope-Automatic Cap Slitting Folding Machine.

Drawing tow

• 1 Newly-Bottle Cap Slitting Folding Machine.28MM Pet Preform Mould.

Crimping

• 2 Drawn tow is then fed into compression boxes,48MM Pet Preform Mould, at a rate of 9-15 crimps per inch (3-6 per cm).30/25 PP Preform Mould.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Cap Assembly Machine For Add Foam Liner.Cap Assembly Machine For Add Washers.

Cutting

• 4 Following heat setting,Flip Top Cap Assembly Machine. 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)Push Pull Cap Assembly Machine.Sport Cap Assembly Machine, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Press Cap Assembly Machine.

The Future

Plastic Cap Assembly Machine,Bottle Cap Assembly Machine's fastest-growing fiber.Mineral Water Cap Slitting Machine. 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,Medicine Cap Cutting Machine, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,28mm Plastic Cap Slitting Machine. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Bottle Cap Cutting Machine, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.