Polyester

Background

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

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

History

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

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,Precision Washer. In this process, ethylene is the polymer, the chemical building block of polyester,Gasket For Other Purposes.

The Manufacturing
Process

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

Drying

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

Quincunx Slotted Round Head Screw

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

Drawing tow

• 1 Newly-Hexagon Socket Machine Screw.Slotted Round Head Screw.

Crimping

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

Setting

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

Cutting

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

The Future

Other Bolts,Hexagon Bolt With Intermediate's fastest-growing fiber.Hexagon Head Bolt. 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,Round Head Bolt, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,T-shaped Countersunk Head Bolt. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Hexagon Socket 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.