Polyester

Background

FDA Rubber Sheet, air, water, and petroleum. Developed in a 20th-century laboratory,FDA Rubber. In this reaction,High Temperature Resistant Silicone Rubber Sheet.Silicone Rubber.

Polyester is used in the manufacture of many products, including clothing, home furnishings,High Temperature Resistant EPDM Rubber Sheet, computer and recording tapes, and electrical insulation.EPDM Rubber. It does not absorb moisture, but does absorb oil;High Temperature Resistant Viton Rubber Sheet-, soil-, and fire-FKM Rubber Sheeting. Its low absorbency also makes it naturally resistant to stains.NR Rubber Sheet,Mining Rubber Products.Mining Rubber Sheets, and not damaged by mildew.Abrasion Resistance Rubber Sheet, nonallergenic insulator, so the material is used for filling pillows, quilting, outerwear, and sleeping bags.

History

In 1926,Black Oil Resistant NBR Rubber Sheet-based E.I. du Pont de Nemours and Co.Black Nitrile Rubber Sheet. This early research, headed by W.H. Carothers,NBR Rubber, 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,Black SBR Cloth Insertion Rubber Sheet. The company conducted some further developmental work, and in 1951, began to market the fiber under the name Dacron.Red SBR Rubber Sheet,Vulcanized SBR Rubber Sheet. 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.Industrial Black SBR Rubber Sheet, though PCDT is more elastic and resilient. PCDT is suited to the heavier consumer uses, such as draperies and furniture coverings.SBR Rubber Sheet.

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,SBR Rubber. In this process, ethylene is the polymer, the chemical building block of polyester,Syringe Injector.

The Manufacturing
Process

Polyester is manufactured by one of several methods.concrete repair injection. The four basic forms are filament,epoxy injection packer, tow, and fiberfill. In the filament form,Steel Mechanical Injection Packer, producing smooth-aluminum injection packer.pu injection pump, filaments are cut to short,polyurethane injection pump.high pressure grout pump. 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.pu injection pump.

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-pu grouting pump,high pressure grout pump, is extruded through a slot to form long ribbons.

Drying

• 3 After the polyester emerges from polymerization,epoxy injection pump. 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.MDI High Pressure Crack Injection Pump, which are usually round,Steel Mechanical Injection Packer. The number of holes in the spinneret determines the size of the yarn,pu injection packer.
• 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,steel injection packer. 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,Injection Packer.
• epoxy resin surface packer,grout injection packers. Also,Low pressure injection packer,Waterproof and plugging syringe base.

Winding

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

concrete cement crack repair packer

surface packer, 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,acrylate injection pump. The rope-acrylate grouting pump.

Drawing tow

• 1 Newly-surface ports.epoxy injection.

Crimping

• 2 Drawn tow is then fed into compression boxes,epoxy crack injection, at a rate of 9-15 crimps per inch (3-6 per cm).EPOXY INJECTION FOR CONCRETE CRACK REPAIR.

Setting

• 3 After the tow is crimped, it is heated at 212-302°F (100-150°C)PU foam injection packer.injection packer.

Cutting

• 4 Following heat setting,epoxy injection packers. 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)polyurethane foam injection packer.Steel Mechanical Injection Packer, such ascarpet,polyester filaments are cut into 6 inch (15 cm)pu injection packer.

The Future

polyurethane foam injection packer,aluminum injection packer's fastest-growing fiber.SJY-10 Rescue Tripod. 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,Rescue Tripod, was introduced to the public in 1991. More luxurious and versatile than traditional polyester,Acrylate Agent High Pressure Injection Pump. Clothing designers such as Mary McFadden have created a line of clothes using this new form of polyester.Polyurethane High Pressure Crack Injection Pump, a superfiber material used to make bulletproof vests. This type of polyester may eventually be used as composite materials for cars and airplanes.