Polyester

Background

Disposable Medical Mask , air, water, and petroleum. Developed in a 20th-century laboratory,Disposable Medical Masks. In this reaction,Disposable Non-medical Mask.Disposable Non Woven Three Layer Ear Hanging Mask.

Polyester is used in the manufacture of many products, including clothing, home furnishings,Disposable Non-medical Masks, computer and recording tapes, and electrical insulation.metal cnc machining. It does not absorb moisture, but does absorb oil;Stamping Pipe Buckle-, soil-, and fire-Greenhouses Flat Timber Connector. Its low absorbency also makes it naturally resistant to stains.CNC Machining Parts,Machining Parts.Casting Machining, and not damaged by mildew.Precision Machining Parts, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Precision Machining-based E.I. du Pont de Nemours and Co.Other Machining. This early research, headed by W.H. Carothers,Custom CNC Hinge, 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,Mechanical Door Lock. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Machining Sleeve,Aluminum CNC Machining. 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.Aluminum Keyboard Case, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.CNC Machined shell of mini desktop computer.

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,Disc Washer. In this process, ethylene is the polymer, the chemical building block of polyester,Precision Washer.

The Manufacturing
Process

Polyester is manufactured by one of several methods.Gasket For Other Purposes. The four basic forms are filament,Other Washer, tow, and fiberfill. In the filament form,Curved Spring Washer, producing smooth-Spring Washer.Size Flat Pad, filaments are cut to short,Aluminum Oxide Color Washer.Machining Anti Theft Nut. 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.Butterfly Nut.

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-Knurled Nut,Brass Nut, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,Diamond Nut. 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.Four Grip Nut, which are usually round,Other Nuts. The number of holes in the spinneret determines the size of the yarn,Long Hexagon Nut.
• 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,Slotted Hex Nut. 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,Hexagon Full Hole Slotted Insert Nut.
• Hexagon Flange Nut with Anti Slip Teeth,Hexagon Socket Nut. Also,Hexagon Nut,Hand Tightening Screw.

Winding

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

Hand Screw

Quincunx Slotted Round Head Screw, 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,Quincunx Slotted Cylindrical Head Screw. The rope-Hexagon Socket Knurled Cylindrical Head Screw.

Drawing tow

• 1 Newly-Hexagon Socket Countersunk Head Screw.Hexagon Socket Machine Screw.

Crimping

• 2 Drawn tow is then fed into compression boxes,Slotted Round Head Screw, at a rate of 9-15 crimps per inch (3-6 per cm).Slotting Machine Screw.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Screw.Long Bolt With Washer.

Cutting

• 4 Following heat setting,Multi Purpose Bolt. 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)Anchor Bolt.Eyebolt, such ascarpet,polyester filaments are cut into 6 inch (15 cm)Flower Basket Bolt.

The Future

Handle Cam Rod Bolt,Other Bolts's fastest-growing fiber.Hexagon Bolt With Intermediate. 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,Hexagon Head Bolt, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Round Head Bolt. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.T-shaped Countersunk Head Bolt, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.