SPE Library

The SPE Library contains thousands of papers, presentations, journal briefs and recorded webinars from the best minds in the Plastics Industry. Spanning almost two decades, this collection of published research and development work in polymer science and plastics technology is a wealth of knowledge and information for anyone involved in plastics.

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PlasticsTrends
PlasticsTrends, a website focused on trends and technologies in plastics, was founded in 2004 by Prithu Mukhopadhyay, Ph.D. Articles were written by scientists and industry experts. Here you will find an archive of PlasticsTrends articles from 2004-2018.
Plastic Facts
Plastic Facts book reviews.
Mix & Match: New Developments Offer New Applications
Prithu Mukhopadhyay, November 1998
Injection molding process imparts a complex thermal deformation history to polymer melts. The complexity rises with multiphase blend systems. How about development in areas of new materials? Can we not get new resins that would give faster cycle times, high ultimate strength and elongation values combined with a wide spectrum of shore A and shore D hardness grades?
Blow it Right or You Blew it
Prithu Mukhopadhyay, January 1999
Blow moulders are whispering these days: "Staying ahead of the competition is the key" or "Growing quietly behind the scenes". Are we ready to take the plunge? Psst …
Carbonate Users: Attention Please
Prithu Mukhopadhyay, February 1999
There is no sure road to success. But search for new products or processes can make the difference in today's market place.
A Breakthrough in Foaming Technology
Prithu Mukhopadhyay, March 1999
MuCell process by Trexel Inc. has been touted as a breakthrough technology. The process offers new foaming capabilities. If your business belongs to the categories such as Extrusion (PP, PS sheet & PVC profiles), Blow (HDPE bottles) or Injection moulding (PP, PS, Nylons, PC/ABS and TPEs) then you will profit from MuCell process. The process produces microcellular foams (5-50 micron ranges) using supercritical fluids (SCFs). These fluids like carbon dioxide or nitrogen mix thoroughly in plastic melt since they have the viscosity of gases and the density of liquids. Being environmentally benign, SCFs eliminate the need for chemical or hydrocarbon-based blowing agents. CO2 or N2 are in fluid state as opposed to gas (in gas assist injection moulding); the process generates evenly distributed microscopic cells throughout the plastic. This makes MuCell technology to foam very thin sections (0.5mm/0.20inch).
Recycling: Giving a Second Life to Plastic Scrap
Prithu Mukhopadhyay, April 1999
Recycling is not as easy as it sounds. Scrap plastics are usually mixed. Before giving them a second chance - they need to be sorted by resin type and/or colour. Otherwise, if 1 wt % PP gets into HDPE stream through bottle caps or by mistake, the toughness of regenerated HDPE bottle decreases. Similarly, as little as 1 ppm PVC in PET can discolour the PET item. Now, sorting can be done manually which is labour intensive and not infallible. When done in an automated system (infrared or X-ray), it becomes expensive. Researchers at SpectraCode of West Lafayette, Ind., have recently invented a point-and-shoot device that can distinguish majority of plastics in 10 microseconds. This translates into 500 tons of plastics/day in a typical recycling operation. Can't we eliminate sorting step and yet produce value added recycled plastics?
Nanocomposite - Technology for the Future
Prithu Mukhopadhyay, April 1999
Researchers from Montell and General Motors call it "Nanocomposite" - a combination of smart fillers (clay) and a proven process (Catalloy). Whether you are in automotive business or you intend to put new developments/ideas in your business - the news is good.
Windows of Opportunities for Single Site Catalyst
Prithu Mukhopadhyay, September 1999
What makes company A produce 50,000 tons/year more of the same PE or PP than company B at the same cost? Catalyst, catalyst and catalyst. Very quietly, catalyst research has brought revolution in the plastics industry. So-called single-site catalysts (many of which are metallocenes) are closely guarded secret of alpha-olefin "big guys". A single metal atom held between two carbon rings builds metallocenes. They might look naive but provide greater control over molecular chain length and structure of polyolefins. These polymers are stronger, purer, and clearer. Upon utilizing these catalysts, material suppliers can accurately design tailor-made resins for specific applications.
Aesthetics and Low-Cost Assembly Favour Film Insert Moulding
Prithu Mukhopadhyay, October 1999
It's the package that sells in the market. Decoration of injection moulded parts are no exception. Commonly known decorative methods are screen printing, pad printing, hot stamping or painting. However, to enhance productivity and achieving design freedom, new decorating methods such as Insert Moulding (IM) is gaining popularity.
Tyre Recycling brings Plastic and Rubber Together
Prithu Mukhopadhyay, January 2000
Making an useful product from a nearly useless item is never an easy task. When it comes to combining rubber crumb from used tires to plastics - the task is even tougher.
Cost and Mixing Keeps the Screw Rivalry Up & Going
Prithu Mukhopadhyay, February 2000
Screw is the heart of an extruder. It is fact that mixing capability of a single screw is poorer than of a twin screw. More precisely, the dispersive action (breakdown) of a twin screw extruder is always better than of a single screw extruder. For producing new blends or alloys, as well as for mixing powdered feedstock or regrinds -- twin screw extruders give unparalleled dispersion. No surprise that twin screw extruders cost more than single screw extruders.
If Your Mold Change is Quick, You Can Earn More Than You Think!
Prithu Mukhopadhyay, March 2000
As cars are manufactured to be on the road, moulding machines are built to run. Not to sit idle on the production floor. But this happens. Moulds changes are necessary to make parts of different sizes and shapes. This means mould set-up time is crucial to the production. Are we able to reduce the set-up time? Surely, we can by changing the mould quicker.
Z-Fiber Process: It Means a Better Composite Reinforcement
Prithu Mukhopadhyay, April 2000
Decades ago, Charles Macintosh embedded two layers of cotton fabric in natural rubber to make a raincoat. Not only he made a good raincoat, he opened-up future for fibre composites (FCs). Since FCs are made from layers of fabric glued together with resins, resins tend to break apart when stressed. Technically, this is known as delamination. It is possible to avoid delamination by adding extra thickness or by riveting. But these add cost and compromise strength. Resistance to delamination holds the key to a successful application.
It Seals, Feels, Flexes, and is Called Thermoplastic Elastomer
Prithu Mukhopadhyay, May 2000
Slowly but surely, new developments in thermoplastic elastomers (TPEs) are providing alternatives to traditional rubbers. They can provide cost-effective, high performance replacements to EPDM, neoprenes and polyurethanes. Parts or items can be designed ergonomically with TPEs. Who can refuse a plastic part that offers good feel, comfort and easy control? TPEs' popularity is understandable since they are processed like thermoplastics, yet perform like rubbers. That's no surprise. TPEs are two-phase blends system: a hard thermoplastic phase combined with a soft rubber phase. As Advanced Elastomer Systems (AES) puts it, "with TPEs like Santoprene, you can flex your imagination". No exaggeration indeed! Whether the soft-grip handle of MACH3 razor or the velvety, tactile feel of colourful Contura staplers - TPEs are taking the centre stage.
Fulcrum Technology Boosts Thermoplastic Pultrusion Process
Prithu Mukhopadhyay, June 2000
Composites are fabricated in a variety of processes. However, pultrusion process is favoured when high volume production of composite materials is demanded. Its ability to produce constant cross-section of profiles with little waste materials makes pultrusion one of the most cost-effective processes. For equivalent strength, pultruded finished products can be 50% lighter than aluminum and 80% lighter than steel. This is only part of the story.
Believe it or not Plastic is the Material of the New Millennium
Prithu Mukhopadhyay, October 2000
It starts with the Nobel Prize in Chemistry 2000. The Royal Swedish Academy of Sciences has awarded this year's Nobel Prize in Chemistry to Professor Alan J. Heeger, Professor Alan G. McDiarmid and Professor Hideki Shirakawa "for the discovery and development of electrically conductive polymers".
Plastics Bring Flexibility to Fast Paced Display Technologies
Prithu Mukhopadhyay, February 2001
Commercially available current displays still have some disadvantages. For instance, those based on inorganic light emitting diodes (LED) encapsulated in glass are brittle, heavy and expensive. The good news is, displays may be available soon flexible and lighter. New and fascinating application of plastics may change the way we use monitors, cellular phones or TV screens. Now, light emitting diodes can be made of conductive polymers. These polymers behave similar to semiconductors than to metallic conductors and, when specially prepared exhibit light emission on junctions. This electroluminescent property can be exploited by depositing a fine pattern of Light Emitting Polymers (LEP) onto a wide range of flexible and inflexible substrates. Cambridge Display Technology (CDT) in UK which develops LEPs collaborates with Seiko-Epson (SEC) bringing latter's state-of-the art active matrix backplane and inkjet printing technologies. Together, they have developed a 2.5 square inch full colour display that utilizes CDT's red, green and blue polymers. Since LEPs are self-emissive (like LEDs), many components used in liquid crystal display (LCD) like polarisers, colour filters and backlights are not required. Moreover, printing of LEP material from a liquid solution reduces manufacturing cost, overall thickness and weight of the LEP display. LEP based cell phones are the first product in the market developed by Philips, a CDT partner. CDT develops LEP displays with its European, American and Asian partners including Seiko-Epson, DuPont, DELTA, Philips, Hewlett-Packard, Hoechst and Uniax.
Not Only Heat Resistant, Novel Plastic Composites Provide Impact Resistance
Prithu Mukhopadhyay, December 2001
Technologically, "nanocomposite" is not a new word. However, it is currently a very exciting word for many researchers. Just like genome research. The recent development of nano-porous, nano-composites by researchers at Ohio State University adds a new dimension to heat resistant plastics.
Tissue Engineering - Another Hot Field For Plastics
Prithu Mukhopadhyay, October 2002
Simply put, tissue engineering is the building of living tissue and an emerging field that holds future of medicine. Tissue engineering one day may help doctors to replace or repair failing, injured or aging human body parts.


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ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers
Available: www.4spe.org.

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