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Topic: Thermosetting plastic


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In the News (Mon 22 Apr 19)

  
  SPI: About the Industry: Processing Methods
As soon as the plastic cools to a solid state, the mold opens and the finished plastic is ejected from the press.
It differs from compression molding in that the plastic is heated to a point of plasticity before it reaches the mold and is forced into a closed mold by means of a hydraulically operated plunger.
As the plastic extrusion comes from the die, it is fed onto a conveyor belt where it is cooled, most frequently by blowers or by immersion in water.
www.plasticsindustry.org /industry/process.htm   (1151 words)

  
 Plastics: Introduction, overview, background, student resources. Explain that Stuff!   (Site not responding. Last check: 2007-10-11)
Plastics are synthetic chemicals extracted mainly from petroleum and composed of hydrocarbons (compounds made from chains of hydrogen and carbon atoms).
Plastic is such a dominant feature of the modern world that it seems almost impossible to imagine it being more pervasive than it already is. Yet chemists continue to pioneer improved methods of polymerization and continually produce revolutionary new plastic materials.
Their new plastic process could reduce the number of body parts from around 80 to just 6, eliminate the need for painting (because the plastic body can be colored when it is molded), and could halve the cost of some conventional cars.
www.explainthatstuff.com /plastics.html   (1430 words)

  
 plastic - HighBeam Encyclopedia
PLASTIC [plastic] any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn.
There are two basic types of plastic: thermosetting, which cannot be resoftened after being subjected to heat and pressure; and thermoplastic, which can be repeatedly softened and remolded by heat and pressure.
The first important plastic, celluloid, was discovered (c.1869) by the American inventor John W. Hyatt and manufactured by him in 1872; it is a mixture of cellulose nitrate, camphor, and alcohol and is thermoplastic.
www.encyclopedia.com /doc/1E1-plastic.html   (886 words)

  
 CBD-227. Reinforced Thermosetting Plastic Pipe - NRC-IRC
Thermosetting plastic materials are always used in conjunction with reinforcement and fillers.
The mechanical strength and the resistance to heat and other service conditions of thermosetting plastic pipe depend on the type of resin used as the matrix, the type and construction of the reinforcement, the nature of the fillers and the method of fabrication.
Reinforced thermosetting plastic pipe may consist of 15 to 70 per cent glass fibre, 0 to 50 per cent filler (including sand), and 30 to 75 per cent resin.
irc.nrc-cnrc.gc.ca /pubs/cbd/cbd227_e.html   (1592 words)

  
 Thermosetting plastic - Wikipedia, the free encyclopedia
Thermosetting plastics (thermosets) are polymer materials that cure, through the addition of energy, to a stronger form.
Thermoset materials are usually liquid, powder, or malleable prior to curing, and designed to be moulded into their final form, or used as adhesives.
A thermoset material cannot be melted and re-molded after it is cured, attempting this causes the material to inflaminate.
en.wikipedia.org /wiki/Thermosetting_plastic   (297 words)

  
 CBD-168. Rigid Thermosetting Plastic Foams - NRC-IRC
Although some show limited plastic flow at elevated temperatures, thermoset foams do not usually exhibit a melting range and can often be used at higher temperatures than thermoplastic foams (there are exceptions).
Plastics in general, and most foams in particular (because of their large surface area), can present a degree of fire and smoke hazard in buildings.
As thermosetting materials, rigid urethane foams have relatively good resistance to thermal decomposition up to about 390 to 480°F, Their maximum continuous service temperature is 212 to 275°F (100 to 135°C), whereas conventional polyolefins, polystyrene and styrene copolymer foams cannot be used above 160 to 175°F (71 to 79°C).
irc.nrc-cnrc.gc.ca /pubs/cbd/cbd168_e.html   (2216 words)

  
 Hermetic sealing cover for a container for semiconductor devices - Patent 4109818
A sealing ring is formed of substantially chemically unreacted thermosetting plastic material, preferably the same as the plastic material of the cover coating, and is of a size substantially to register with the periphery of the cover.
When using plastic sealing performs as described with a cover which is an electrically conductive metal, the area of the cover surrounded by the plastic preform and which faces the inside of the cavity after sealing is exposed.
When a thermosetting plastic preform such as epoxy is preattached to the cover by applying heat, adhesion is obtained between the cover and the surface of the preform in contact with the cover.
www.freepatentsonline.com /4109818.html   (1428 words)

  
 Ace
Thermosetting plastics are primarily used for appliance knobs and handles, bottle caps, radio and TV cabinets, laminated countertops and melamine dinnerware.
Although thermosetting plastics are not affected by moderate heat, you should not inadvertently leave a detachable pot handle or melamine dinner plate near intense or direct heat.
Today, many plastics are "boil- proof" or safe for washing in an automatic dishwasher, but you should still read the manufacturer's fact tag or label before washing the item.
www.acehardware.com /sm-learn-about-plastics--bg-1267490.html   (686 words)

  
 U.S. Patent: 5059446 - Method of producing plastic coated metal strip - October 22, 1991
It is known to form pollution free thin plastic coatings on a metal surface using electrostatically charged powder that may be melted in a short period of time, i.e.
After being coated with a plastic powder, strip 12 is passed through an induction coil 22 wherein the powder is heated to a temperature at least equal to its melting point.
It will be understood plastic powders of the invention is meant to include thermoplastic and thermosetting generally having a particle size of about 20-100 microns in diameter.
www.everypatent.com /comp/pat5059446.html   (5600 words)

  
 Article - Important considerations regarding adhesion to plastics Part I - Thermosetting plastics
Plasticizer migration and degradation of the interface through UV radiation are common examples of weak boundary layers that can develop with time at the interface.
Thermosetting plastics cannot be dissolved in solution and do not have a melting temperature since these materials are crosslinked.
The surface of thermoset materials may be of slightly different chemical character than the material beneath the surface because of surface inhibition during cure or reaction of the surface with oxygen and / or humidity in the surroundings.
www.specialchem4adhesives.com /resources/articles/article.aspx?id=612   (4603 words)

  
 ARTICLE: Plastic Mold Injection
Until then, plastic products continued to be machined, formed and assembled by craftsmen in a much more labor- and time-intensive environment.
During manufacture, the thermosetting plastic was poured into a mold and "cured" by heat or the addition of chemicals.
Plastic mold injection involves heating and high-pressure injection of a thermoplastic into a water-cooled mold.
www.centerlinehobbies.com /pmi.html   (811 words)

  
 PRODUCT MATRIX - Plastic
Plastics are materials with a high degree of utility and many safe household uses.
Some plastics, however, are associated with dangers in the manufacturing process, when misused and on other occasions: over their entire lifecycle from manufacture to ultimate disposal.
Plastics contribute to the volume of non-organic materials in landfills that are not easily degradeable.
pasture.ecn.purdue.edu /~epados/waste/house/plastic.htm   (1248 words)

  
 #1 Site For Learning Chemistry
A plastic material, which cannot be repeatedly melted-molded again, is called a thermosetting plastic.
Thermosetting plastics are long chain molecules, which have crosslinks to other long chains.
Thus thermosetting plastics do not become soft on heating and they do not change their shape on heating.
home.att.net /~cat6a/org_mat-III.htm   (316 words)

  
 Some Basic Language of Epoxy Tooling   (Site not responding. Last check: 2007-10-11)
Thermosetting plastics of the type used in fiberglass boat hull and automobile body construction.
Thermosetting plastic used for foam insulation, flexible molds, protective coatings, and abrasion resistant castings.
A plastic which is capable of being re-formed a number of times by heating.
www.resinservices-reklein.com /appendix/glossary.htm   (679 words)

  
 Plastic
If plastiko, also known as plastic, had never been invented, life in the world today would be a struggle because the natural resources would have vanished and packaging products would break easily.
Before today one would have known plastic as an item which can be molded into a different shape and not known as the universal product for packaging.
Plastic surgery, one of the biggest jumps in technology for the plastic era has changed both the medical and cosmetic world.
www.mrburnett.net /auggieplastic.html   (1014 words)

  
 PRODUCT MATRIX - Plastic   (Site not responding. Last check: 2007-10-11)
Plastic is made from fractions of natural gas or crude oil changed chemically into a solid form.
Thermosetting plastics are set to a permanent shape and cannot be softened.
Another way to reduce the amount of plastics entering the landfill is to reduce the amount of plastic you purchase and throw away.
pasture.ecn.purdue.edu /~epados/waste/old_plastic.htm   (516 words)

  
 Online Machine Shop - Plastic sheet
Plastic sheets are resistant to corrosion and chemicals.
Plastic sheets replace other conventional material such as metals, paper, wood, stone, glass and ceramics and are used widely.
Plastics are classified into two basic types based on their behavior when they are heated.
www.emachineshop.com /material-plastic/plastic.htm   (297 words)

  
 Sho-Me Dictionary - P   (Site not responding. Last check: 2007-10-11)
There are two basic types of plastic: thermosetting, which cannot be resoftened after being subjected to heat and pressures; and thermoplastic, which can be repeatedly softened and reshaped by heat and pressure.
The permanence of thermosetting plastics is due to the heat- and pressure-induced cross-linking reactions the polymers undergo.
Alternatively, the powder can be plasticized by outside heating and then poured into molds to harden (transfer molding); be dissolved in a heating chamber and then forced by a plunger into cold molds to set (injection molding); or be extruded through a die in continuous form to be cut into lengths or coiled (extrusion molding).
www.shomepower.com /dict/p/plastic.htm   (359 words)

  
 Chemistry 1025
Discussion: Plastics are remarkably useful materials, but one of their greatest advantages over other materials, their durability, is also one of their greatest handicaps.
The thermosetting plastics can be molded once during their initial formation.
To reuse plastics, we have to separate one kind of thermoplastic from another so that we can combine all compatible plastics into one group and reprocess them as a whole.
faculty.dbcc.cc.fl.us /swansoj/Plastics_and_Recycling.htm   (606 words)

  
 CRB Fundamentals
Plastics are moldable, chemically fabricated materials produced mostly from fossil fuels, such as oil, coal, or natural gas.
The word plastic is derived from the Greek plastikos, meaning to mold, and the Latin plasticus, meaning capable of molding.
The first commercially successful thermosetting synthetic resin was created by Leo Baekeland in 1909, and over 50 families of plastics have been produced since then.
www.crbtrader.com /fund/articles/plastics.asp   (512 words)

  
 ::Plastic::
Bakelite was water and solvent resistant; could be used as an electrical insulator; was rock hard but could be cut by a knife and was used in 78 rpm records and telephones.
New plastics were invented such as neoprene in 1932, polythene in 1933 and Perspex in 1934.
Plastic as a whole was very important in World War Two.
www.historylearningsite.co.uk /plastic.htm   (360 words)

  
 Fluid tight closure of thermosetting plastic foil - Patent 4196820
The closure is made of a thermosetting plastic foil that is brought in contact with a projecting lip on the rim of a bottle neck whereby a central part of the foil is irreversibly deformed by heating and stretching over the upper surface of the lip.
This invention is concerned generally with sealing all kinds of liquid containers having a profiled rim portion (lip) and charged with a nonpressurized fluid or with a liquid that produces a limited internal pressure and that upon completion of the filling operation are not subject to any heat treatment.
While the invention has been illustrated and described as embodied in connection with a standard milk bottle, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.
www.freepatentsonline.com /4196820.html   (1102 words)

  
 Plastica Nardon Plastic Injection Molder, Plastic Injection Molding, Plastic Injection Moulder
Plastica Nardon is a plastic injection molder - moulder, and it is concerned with plastic injection molding.
The company deals with moulds development, plastic injection moulding and it deals with the production of plastic technical articles, the production of plastic technical components, the realisation of technical plastic articles and the realisation of technical plastic components.
Plastica Nardon is a plastic injection molder, plastic injection molding, plastic injection moulder.
www.plasticanardon.com /eng/index.htm   (214 words)

  
 Plastic Fabric,Plastic Fabric Supplier,Plastic Fabric Exporter   (Site not responding. Last check: 2007-10-11)
The term plastic covers a range of synthetic or semi-synthetic organic condensation or polymerization products that can be molded or extruded into objects or films or fibers.
The name is derived from the fact that in their semi-liquid state they are malleable, or have the property of plasticity.
There are two basic types of plastic: thermosetting, which cannot be re-softened after being subjected to heat and pressure; and thermoplastic, which can be repeatedly softened and re-molded by heat and pressure.
www.textilefurnishings.com /plastic-fabric.html   (265 words)

  
 Recycling Plastics   (Site not responding. Last check: 2007-10-11)
Your #2 milk jug, high density polyethylene, is a thermosetting plastic.
First, if you melt thermosetting plastic and then attempt to reset it, you will have a non-cohesive blob of goo to contend with.
Melting plastic would result in a release of a host of unpleasant compounds (as anyone who every burned a polystyrene foam cup will attest to).
www.newton.dep.anl.gov /newton/askasci/1993/environ/ENV004.HTM   (416 words)

  
 Thermosetting Plastics Injection Molding Machinery(GYG-1200I) - Ningbo Sanyun Plastic Machinery Plant
Ningbo Sanyun Plastic Machinery PlantHome : Products Product Description: Thermosetting Plastics Injection Molding Machinery(GYG-1200I), GYG series thermosetting plastic injection molding machine is suitable for producing thermosetting plastic wares with high precision.
GYG series thermosetting plastic injection molding machine is suitable for producing thermosetting plastic wares with high precision.
Injection screw directly driven by a low speed, high torque hydraulic motor is suitable for processing various thermosetting plastics.
www.allproducts.com /sup007/sanyun/gyg-1200.html   (406 words)

  
 Thermoplastic - Wikipedia, the free encyclopedia
A thermoplastic is a material that is plastic or deformable, melts to a liquid when heated and freezes to a brittle, glassy state when cooled sufficiently.
Thermoplastic polymers differ from thermosetting polymers (Bakelite; vulcanized rubber) which once formed and cured, can never be remelted and remolded.
Before the introduction of plasticizers, plastic automobile parts often cracked in cold winter weather.
en.wikipedia.org /wiki/Thermoplasticity   (462 words)

  
 ask4plastic Thermosetting Plastic Material PVC Tarpaulins PVC Leather Bottle Caps PC Bottles Exporters Importers ...
Our company is specialized exporting recycle plastics to would wild.Due to the business expansion, we need more suppliers to meet the demand of us.
We are the leading exporter of machinery used in the manufacturing of Plastic PP mats / Floor covering also known as chatai in India.
We are setting up a disposable plastic tableware manufacturing plant and we are looking for suppliers of the complete plant for the same either indigenous or imported.
www.ask4plastic.com /aug2005.htm   (6542 words)

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