Polyester

Background

Disposable Surgical Masks, air, water, and petroleum. Developed in a 20th-century laboratory,Disposable Medical Mask . In this reaction,Disposable Medical Masks.Disposable Non-medical Mask.

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

History

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

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,CNC Machined shell of mini desktop computer. In this process, ethylene is the polymer, the chemical building block of polyester,Disc Washer.

The Manufacturing
Process

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

Drying

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

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 Tightening Screw

Hand 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 Round Head Screw. The rope-Quincunx Slotted Cylindrical Head Screw.

Drawing tow

• 1 Newly-Hexagon Socket Knurled Cylindrical Head Screw.Hexagon Socket Countersunk Head Screw.

Crimping

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

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)Slotting Machine Screw.Screw.

Cutting

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

The Future

Flower Basket Bolt,Handle Cam Rod Bolt's fastest-growing fiber.Other Bolts. 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 Bolt With Intermediate, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Hexagon Head Bolt. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Round 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.