Polyester

Background

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

History

In 1926,Gas Fireplace Magnet Valve-based E.I. du Pont de Nemours and Co.Solenoid Valve BBQ. This early research, headed by W.H. Carothers,Nickel Alloy Orkli Thermocouple Head, 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,Spare Parts Stove Thermocouple. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Gas Fireplace Temperature Sensor Thermocouple,Gas Cooker Thermopile Sensors. 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 Barbecue Thermocouple for Home Appliance, 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 Kitchenware.

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

The Manufacturing
Process

Polyester is manufactured by one of several methods.Gas Thermocouple. The four basic forms are filament,Thermocouple for Gas Oven, tow, and fiberfill. In the filament form,Gas Magnet Valve for Flame Failure Device, producing smooth-Magnet Valve.Electromagnetic Valves, filaments are cut to short,Bottle Cap Printer Machine.SMC Sheet Automatic Cutter 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 Cutting 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-Cap assembling Machine For Add Aluminium Foil,Flip Top Cap Assembling Machine, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Press 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.Push Pull Cap Assembling Machine, which are usually round,Sport Cap Assembling Machine. The number of holes in the spinneret determines the size of the yarn,Bottle 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,Auto Cap Liner 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,Aluminium Foil Cap Liner Machine.
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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.

High Speed Cap Slitting Folding Machine

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

Drawing tow

• 1 Newly-28MM Pet Preform Mould.48MM Pet Preform Mould.

Crimping

• 2 Drawn tow is then fed into compression boxes,30/25 PP Preform Mould, at a rate of 9-15 crimps per inch (3-6 per cm).Cap Assembly Machine For Add Foam Liner.

Setting

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

Cutting

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

The Future

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