Technology

14/09/2014

Liquid Light raises $15M and a lot of eyebrows as it advances towards making $$ out of wasLiquid Light raises $15M and a lot of eyebrows as it advances towards making $$ out of waste CO2.te CO2.

04/08/2010


30/07/2010


11/07/2010

11/07/2010

09/07/2010


09/04/2010

  • Teijin Unveils Futuristic Electric Concept Car

The Teijin Group unveiled on March 30 a super-lightweight electric concept car made with proprietary materials and technologies including carbon fiber composites, polycarbonate resins and bio-derived polyester. Weighing only 437 kg, less than half that of conventional electric vehicles, the PU_PA EV (as in “pupa electric vehicle,” a reference to metamorphosis) embodies Teijin’s vision of what a vehicle will look like on the market in five to ten years.

The vehicle is being exhibited in the Teijin Mirai Studio, a showroom located in the same building as Teijin’s headquarters in Tokyo that presents the group’s leading-edge materials and technologies.

Capable of 60 km/hour and a cruising range of 100 km, the PU_PA EV offers the functionality and structural integrity of a practical automobile. As a symbolic electric concept car, it is infused with proprietary advanced technologies:

Weight Reduction
–    Body incorporating a core structure made of carbon fiber composite material.
–    Windows made of polycarbonate resin with a heat absorbing function weighing only half as much as glass.
–    Modularized parts made with single-piece molding, etc., reducing total parts to about 20.
Biotechnology
–    Interior items (seats, floor mats, etc.) made with bio-derived polyester.
Reduced Environmental Burden
–    Metal-toned TEFLEX PET film, used as an alternative to chrome plating.
–    Low-noise tire cord made with TEONEX polyethylene naphthalate (PEN) fiber.
Electronics
–    Multi-device communication using CELL FORM two-dimensional communication sheet.

Going forward, Teijin will use its innovative concept car as a marketing tool to showcase the group’s environmentally responsive technologies and customer-oriented solutions.

The Teijin Group is cultivating markets and developing technologies in four strategic sectors: automobiles and aircraft, information and electronics, healthcare, and environment and energy. The Teijin Technology Innovation Center and the Teijin Composites Innovation Center were established in 2008 to pursue joint-development initiatives with customers. Along with the Plastics Technical Center, the facilities have enabled the Teijin Group to enhance its “customer lab” program of solution-oriented collaboration with customers.

The Mobility Business Project, a department overseen directly by the CEO, was established in April 2009 to support business expansion in the automobiles and aircraft sectors, focusing on the development of materials and technologies for lightweight, hybrid and electric vehicle designs.

09/04/2010

  • Spring, a leading global manufacturer of mechanical springs since 1918, has leaped past its competition with a totally new technology – LeeP plastic composite springs molded from SABIC Innovative Plastics’ Ultem* resin. 

Among the first springs ever made with high-performance, engineered plastic, LeeP compression springs provide critical advantages over traditional metal alloy springs, enabling this valued SABIC Innovative Plastics customer to expand its business for greater potential success. SABIC Innovative Plastics provided a range of specialized services for this project, including predictive analysis, material characterization and mold optimization, clearly illustrating how the company helps its customers succeed through its 75-years of materials technologies expertise and innovation. 

Springs, Made by Lee Springs with SABIC Innovative Plastics’ Ultem* Resin
Ultem resin gives the new springs a broad range of high performance properties including high strength-to-weight ratio, no magnetic interference, high corrosion resistance, and dielectric insulation for non-conductive applications. 
“We specifically selected Ultem resin for LeeP because of its superior track record of success in the most demanding application areas vs. competitive materials,” said Al Mangels, Lee Spring president. “The resin exceeded our expectations at every step. It’s a truly exceptional product that, due to its tougher-than-tough balance of high-performance properties, performs better than any other thermoplastic. When all was said and done, we knew we had set a new industry standard, which, after all, was the goal.”
“Thermoplastics have rarely before been used in high-performance springs, so we were venturing into virtually uncharted territory with Lee Spring,” said Shawn Lee, product marketing manager, SABIC Innovative Plastics. “But through our strong chemical and materials expertise, and our technical customer support – ranging from initial calculations and predictive analyses to benchmarking how Ultem resin would perform in the new line of springs – we delivered another winner. Equally important, SABIC Innovative Plastics provided a valued customer a major competitive advantage and an opportunity to capture greater market share, which is what we work toward for all of our customers.” 
Ultem Resin Opens New Opportunities
Lee Spring saw an untapped opportunity to expand its market reach with high-performance thermoplastic springs that approach the strength of metal without certain drawbacks. According to Steve Kempf, CEO of Lee Spring, “Our customers’ wish list includes strength, heat stability, corrosion resistance, non-magnetic properties, insulation, inertness, low flame toxicity and recyclability. What led us to Ultem resin was its excellent all-around performance combined with great strength. Ultem resin satisfies the full gamut of customer requirements in a single offering.” 
For example, in marine applications, LeeP springs made with Ultem resin offer longer life due to resistance to salt water. For the medical device industry, LeeP springs avoid the cost of shielding, which is necessary for metal springs that can interfere with diagnostic imaging. Other market sectors that may benefit from the new springs are: medical products and processing equipment, pharmaceutical delivery devices, food processing and packaging equipment, aerospace products, electronics and electrical equipment, water purification systems and automotive interiors.
LeeP Plastic Composite Springs are stocked in a variety of standard sizes, each available in a “rainbow” of strengths formulated from Ultem resin containing various levels of fiber reinforcement.
Robust Performance and Much More
________________________________________
Spring rate (a function of shear modulus), cycle life (resistance to fatigue) and creep resistance are key performance measures for these compression springs. Ultem resin not only provides excellent results for these criteria, but also delivers other key properties:
”   Mechanical stability up to 170C, allowing for use in a wide range of environments. 
”   High strength-to-weight ratio: Ultem resin is the highest strength amorphous resin in the market. 
”   High corrosion resistance and generally compatible with many chemicals including strong acids, weak bases, aromatics, and ketones. 
”   Non-magnetic to avoid interference with imaging and other Ferro-sensitive technologies. 
”   Dielectric insulating material suitable for non-conductive applications. 
”   Inert non-contaminating plastic composite protects product purity. 
”   Low flammability and toxicity ensure environmental safety. 
”   Recyclable and compliant with most global regulations including RoHS and REACH.
Posted Apr , 2010 

09/04/2010

 

  • IdentiPol QA enhancements to be launched at PDM 2010

Keyworth, March 2010.  Triton Technology Limited, the company behind the identiPol

QA, will be presenting the unit’s latest enhancements at PDM 2010 (Telford, 18-20

May 2010). Incorporating the latest version of its software, the identiPol QA, which is used by recyclers, extruders and moulders for the quality assurance testing of thermoplastics, can now be used to check the identity of unknown polymers. The identiPol QA’s user-interface has also been improved based on customer feedback. Triton Technology can be found at stand J16 in Hall 2.

The ability of the latest version of the identiPol QA software to identify polymers is based upon the enhanced methodology integrated within it, as John Duncan, managing director at Triton Technology explains: “It is now possible for the system to assist in the identification of unknown polymers, which it does based upon their thermo-mechanical properties, for example melting point, as measured by theinstrument. 
We will continue to develop and improve the identification algorithms used by the identiPol to further extend the number of materials that can be reliably identified.”  Beyond its use for material identification purposes, the identiPol QA provides users with rapid, easy-to-interpret information on the quality and expected performance of incoming raw material. The presentation of this information has been further improved following revision of the user-interface based on customer feedback.
“Ultimately we want to help moulders reduce the risk of incorrect or poor material being used in their machinery or the substandard performance of the final product. By using an identiPol system, moulders can expect to see reductions in wastage as well as improvements in cost effectiveness and efficiency,” confirms Duncan.

Established in 1997, Triton Technology Limited is a leading designer and manufacturer of Dynamic Mechanical Analysis (DMA, DMTA) and Dielectric Thermal Analysis (DEA, DETA) equipment plus wide temperature range ovens, and is well known in the field of material science for its visionary designs and depth of in-house knowledge.  A fully- accredited ISO 9001 company, Triton employs twelve people at its head office in Keyworth, Nottinghamshire, and has a network of distributors and agents to sell and support its products worldwide. Further information can be found at  www.tritont.com.

For marketing enquiries please contact Kerry Bodin on 01159 375555 or email: Kerry.bodin@triton-technology.co.uk
For press enquiries please contact Andrew Wilkins on 01353 663350 or email:
triton.press@btconnect.com

New identification functions and an improved user-interface are amongst the enhancements of the identiPol QA to be introduced at PDM 2010.
(Photo available as high resolution jpeg as an attachment to this mail or from triton.press@btconnect.com)
Triton-UK-2010-02

 

  • Atlas Copco first to offer certified ‘net zero energy consumption’    compressors – the ‘Carbon Zero’ Range 

2009-07-13

Antwerp, Belgium, June 30, 2009: Atlas Copco’s Oil-free Air division has announced that the company’s ZR series of water-cooled
oil-free air compressors with built-in energy recovery systems is the first in the world to be TÜV certified for ‘net zero energy
consumption’ at specific design conditions.

Release date:   Thursday, 27 August 2009

It has been proven that 100% of the electrical power input could be recovered in the form of hot water.  With these ‘Carbon Zero’ compressors, industries using a great deal of hot water and steam such as food & beverage, dairies, pulp & paper, pharmaceuticals, chemicals and petrochemicals, power plants, clean rooms and textiles can dramatically cut down on their energy bill. 

Energy savings in compressed air systems are very important as energy consumption typically represents over 80% of a compressor’s lifecycle cost. While compressed air systems on average account for about 10% of industrial electricity consumption, it can be as high as 40% of a plant’s electricity bill. For this reason, Atlas Copco has been innovating for energy-efficient compressed air solutions for many years. The new certification is yet another milestone in Atlas Copco’s history of innovation. 

“We are very pleased to offer our customers a compressed air solution which can recover 100% of the input energy,” says Stephan Kuhn, President of Atlas Copco’s Compressor Technique business area. “Today our customers face stringent targets to reduce carbon dioxide emissions. With the Carbon Zero compressor, customers  can get compressed air virtually for free, which has significant impact towards preserving the environment and also on their bottom line.”

The independent Technische Überwachungs-Verein (German Technical Monitoring Association, or “TÜV”) earlier this year supervised the type-testing of Atlas Copco’s ZR 55-750 water-cooled oil-free screw compressors, equipped with built-in energy recovery systems . The testing process involved real-time measurement of the electrical power input and the output power as hot water. The two measurements were then compared.  It was proven that under the specific design conditions of 40°C and 70% relative humidity, 100% of the input electrical power could be recovered. 

While the Carbon Zero compressor compresses air, all the input electrical energy is converted into heat. This heat appears at different compressor components. The challenge is really to pick up this heat from all the components which are the compression elements, the oil cooler, intercooler and aftercooler.  The built-in energy recovery system circulates cooling water through all these components and as a result of the heat transfer, yields hot water at up to 90°C.

This hot water can find several applications in the industry. 

Most industries can make use of hot water for space heating, showers and other such applications. However the industries that will benefit the most are those that have a continuous need for hot water and steam in their processes.  Typical process hot water and steam users include food & milk processing plants (scalding, cleaning, sterilization, melting), pulp & paper industry (in the digester & evaporators, and in bleaching, pulping ), textile industry (dyeing, stabilization of manmade fibers), pharmaceutical industry (fermentation and sterilization), refineries, chemical and petrochemical plants (steam distillation, enhanced recovery, stripping, heat tracing), power plants (electricity generation), clean rooms (humidification). 

The hot water or steam is normally generated using industrial boilers which consume electricity or fuels like heating oil or natural gas. When using hot water from the compressor, either directly or as pre-heated boiler feed water, the consumption of fuel can be either dramatically reduced or be eliminated.  This results in significant energy savings. 

Chris Lybaert, President of Atlas Copco’s Oil-free Air Division says “In summary, the Carbon Zero compressor offers our customers a double-win with enormous environmental benefits along with increased profitability.”
Atlas Copco may be required to disclose the information provided herein pursuant to the Securities Markets Act. 

For further information please contact:
Elaine Tibiletti, Communications Manager, Atlas Copco Prime Energy 
Tel: +1 (210) 413 7988 
E-mail: elaine.tibiletti@us.atlascopco.com

FOOTNOTE TO EDITORS:
This release, plus a full press kit and high-resolution photographs and diagrams, is available on the Atlas Copco website: www.carbonzerocompressors.com

Atlas Copco is a world leading provider of industrial productivity solutions. The products and services range from compressed air and gas equipment, generators, construction and mining equipment, industrial tools and assembly systems, to related aftermarket and rental. In close cooperation with customers and business partners, and with 136 years of experience, Atlas Copco innovates for superior productivity. 
Headquartered in Stockholm, Sweden, the Group’s global reach spans more than 160 markets. In 2008, Atlas Copco had  34 000 employees and revenues of BSEK 74 (BEUR 7.7). Learn more at www.atlascopco.com.

Oil-free Air is a division within Atlas Copco’s Compressor Technique business area. It develops, manufactures, and markets oil-free air compressors for all kind of industries worldwide where the air quality is vital, and oil-injected compressors for less critical applications. The division focuses on air optimization systems and quality air solutions to further improve customers’ productivity. The divisional headquarters and main production center are located in Antwerp, Belgium

  • Magnetic technology revolutionizes refrigeration

Change in refrigeration technology could cut energy consumption by up to 50 percent BASF researchers cooperate with Delta Electronics, Inc.

BASF and Delta Electronics, Inc. want to use environmentally friendly magnetocaloric technology to develop new cooling systems and explore the opportunities of magnetocaloric power generation. The cooperation partners are working on materials and prototypes for cooling systems and power generators intended to replace conventional compressor technology in refrigerators and air conditioning systems.

“Our experts in material and process development work closely with scientists in fundamental research at internationally renowned universities such as the TU Delft and our innovative industrial partner, Delta Electronics,” said Professor Rainer Diercks, President Chemicals Research & Engineering at BASF. ” BASF has already started the scale-up for the production of special, economically feasible materials that already show a magnetocaloric effect at relatively low temperatures and thus offer a broad range of applications. This is a major contribution to the success of this project.”

“We are delighted to team up with BASF,” said Delta’s Vice Chairman and Chief Executive Officer Yancey Hai. “Our mutual development project with BASF is in line with our mission to provide innovative, clean and efficient energy solutions for a better tomorrow. We will generate new business opportunities with our competency as a system integrator of efficient energy technologies.”

Cooling systems based on the magnetocaloric effect have the potential of significantly reducing energy consumption. The magnetic technology does away with gaseous refrigerants and is therefore quieter and causes less vibration than conventional compressor type refrigerators. It is also compact enough to suit all conventional household refrigerators and commercial applications such as computer cooling systems or air conditioners.

As long ago as 1880, the German physicist Emil Warburg observed that ferromagnetic materials heat up when introduced into a magnetic field and cool down again when removed. Magnetic field based cooling systems have existed since the 1930s – but so far only in laboratories. Today, new materials in magnetic refrigeration technology and more effective permanent magnets allow for a much larger effect. Already at normal ambient temperatures, even weak magnetic fields can generate particularly large temperature differences that can be utilized for cooling by means of a heat exchange system. As a specialist in innovative solutions for energy management, Delta wants to develop small coolers for household appliances.

“We’re all ready to go. What we need now are prototypes for cooling systems to demonstrate the energy-saving potential in everyday use,” said Dr. Thomas Weber, Managing Director of BASF Future Business GmbH, which coordinates material optimization, product design and production processes. Initial estimates by material researchers suggest that energy consumption can be cut by up to 50 percent by using a unit with magnetic refrigerating technology instead of a conventional refrigerator.

Commercially viable applications for magnetocaloric cooling are only possible if there is an abundant supply of affordable raw materials. BASF is working, for example, on chemically stable manganese-iron compounds. These compounds are characterized by low-volume expansion and a particularly large magnetocaloric effect. At the same time, these materials are cheaper to produce than those based on the metal gadolinium and its salts that have been used to date. The production of larger amounts for industrial applications is currently being tested.

One of the main research goals in the area of magnetocalorics is to save energy in numerous potential applications ranging from cryoproduction in the process industry, through automotive air conditioners, miniaturized cooling systems for electronic components and refrigerators. Refrigerators for example account for about one-fifth of total domestic energy consumption.

Release date: July 22, 2009

 

  • Color Control Directly at the Plastic Pellets

 

A color control system equipped with a high-precision spectral line camera permits – for the first time ever – the on-line color control directly at the plastic pellets. With this innovative technology, color measurement takes only a few minutes and the results are available for color correction and/or quality documentation virtually in real time.

At the Coperion Open House, which took place at the end of January 2009, the ROC ColorControl system showed, in conjunction with a small compounding line (in the background), how fast, easy and reliable color measurement can be and how quickly color correction is carried out. Photo: Coperion, Stuttgart/Germany

At the Coperion Open House, which took place at the end of January 2009, the ROC ColorControl system showed, in conjunction with a small compounding line (in the background), how fast, easy and reliable color measurement can be and how quickly color correction is carried out. Photo: Coperion, Stuttgart/Germany

Designated ROC ColorControl, this on-line color control system is now offered by Coperion GmbH, Stuttgart/Germany, as optional ancillary equipment for its compounding extruders. Coperion has signed a distributor agreement with the developer of this ROC ColorControl system, the company of ROC Rapid Optical Control GmbH, Münster near Dieburg/Germany. Thus Coperion has further augmented its position in the market as a supplier of complete customized systems.

The ROC ColorControl system offers the compounder numerous advantages:

* It decisively shortens the time needed for initial color adjustment and correction, as the timeconsuming injection moulding of test pieces can now be waived.
* It ensures virtually immediate compliance with compound color specifications when changing over production from one product and/or color to another.
* The fast scanning time and negligible costs permit – for the first time ever – virtually continual color monitoring and documentation.
* It extends the productivity of the extruder and considerably reduces manufacturing times and costs, especially when processing relatively small batches.

For color measurement, the ROC ColorControl system requires a sample quantity of pellets of approximately 35 ml, which are then spread out evenly on a temperature controlled vibrating table. The results of the measurement, which is performed by the spectral line camera in less than 3 minutes, are evaluated by means of software specially developed by ROC for this application. The special feature of the system lies in its ability to make allowance for any shadows, contaminants and/or stress-whitened zones along chopped edges.

The ROC ColorControl system works particularly economically with the fully automatic ROC ContiSampling system, which conveys the sample pellets from the downstream side of the pelletizer to the measuring system in a self-filling and self-emptying transport container. Using a logistic conveying system, it is possible to link as many as six compounding lines with an ROC ColorControl system. As standard, the compounding lines are sampled one after the other. If required, several samples can be taken from the same line in succession, e.g. during start-up. The optional color correcting unit ROC ColorDosage permits particularly fast and easy color adaptation during the compounding process. This unit consists of four to six weigh feeders per extrusion line for different monopigment masterbatches. The smallest metered amounts suffice for color correction. The color changes obtained can already be measured after only a few minutes and are displayed graphically.

63 Years of UV Exposure in 1 Year

 

  • Atlas Material Testing Technology LLC

Release date: April 22, 2009

April 22, 2009, Chicago, IL – Atlas Material Testing Technology is excited to introduce the latest technology for ultra-accelerated exposure testing. This new outdoor testing device can provide approximately 63 years of South Florida UV radiation exposure in a single year. Atlas developed this new solar concentrator technology in partnership with the National Renewable Energy Laboratory (NREL) and the Russian Institute of Laser Optical Technology (ILOT) under a U.S. Department of Energy (DOE) program.

Similar in concept to Atlas’ moderately accelerated EMMA® technology, the ultra-accelerated device tracks the sun while concentrating reflected sunlight on test specimens mounted in a target area. However, the new patented mirror system used in the ultra-accelerated concentrator has very high reflectance in the UV and near visible wave length ranges while attenuating reflectance in the longer wavelength visible and IR portions of the solar spectrum. This technology allows for very high concentrations of UV energy without excessive heating of test samples.

Building high irradiance solar concentrators or laboratory solar simulators for durability testing appears straightforward; however, such devices at ultra-high irradiances typically cause overheating of test samples resulting in unnatural material changes compared to the changes in the end use environment. Atlas’ new technology, on the other hand, simultaneously achieves three requirements critical for ultra accelerated exposure testing:
1. Exposes many different types of materials to ultra-high UV irradiances
2. Maintains high fidelity to the natural solar UV spectrum
3. Maintains specimens at acceptable exposure temperatures

Using multiple focusing mirrors arranged on the curve of a 10 meter sphere, the UV energy may be variably concentrated on a target area approximately 10cm X 10cm. Custom mounting and cooling can be added depending upon specific material exposure requirements. Optically the mirror system has a direct normal 100/1 concentration factor.

Materials/Products that represent good candidates for testing are:
o Materials that require a long service life o Transparent and glazing materials o Small solar PV cells or material used in these cells
o Coatings applied to metal panels
o Materials that perform well in EMMA® or EMMAQUA® exposure testing

Atlas Material Testing Technology LLC
Phone: +1-773-327-4520
Fax: +1-773-327-5787
Email: info@atlas-mts.com

Atlas Material Testing Technology GmbH
Phone: +49-6051-707140
Fax: +49-6051-707149
Email: info@atlasmtt.de

Saturday, 17 January 2009

 

  • China’s yarn dyeing technology achieves a major breakthrough

Recently, Science and Technology Department of the China Textile Industry Association has organized the project appraisal meeting for “the adoption of cold pileup dyeing method of yarn and thread” in Changzhou Jun Hong Dyeing and Finishing Co., Ltd. in Jiangsu province.

This innovative yarn dyeing technology has aroused widespread concern in the industry.
The adoption of cold pileup dyeing yarn method, self-developed by Changzhou Jun Hong Dyeing and Finishing Co., Ltd., can reduce water consumption from 120-160 tons by traditional method to 13 ton for dying one ton of yarn, saving 90 percent of water.

The project has obvious effects of energy- efficiency and emission-reduction; it also has good economic and social benefits as well as broad marketing prospects, for it is in line with the trend of social development. Results of the project have reached advanced international level.

Production costs of current equipment, including water, electricity, dyes, wages and so on, are about 8500 Yuan / ton in general, while production costs of these facilities are about 3,500 Yuan / ton.

Equipment investment of such technology is about 15 million Yuan, it could dye 15 ~ 25 tons of yarn, based on 16 hours of normal driving hours per day, while investment of traditional equipment would be above 50 million Yuan.

It is easy to operate. When using this device, you only need to control the concentration of dye fluid and driving speed.

14 January 2009 

 

  • Control system is ideal for smaller extruders

A new, low-cost, modular polymer melt control system, OptTrol from Dynisco gives users the ability to control pressure and temperature precisely on most extrusion lines. The company says that it offers adaptive, autotuned temperature, pressure and speed control as well as differential control and process-variable trending from a user-friendly colour touch-screen operator interface. The system can be used on new extruders or retrofitted to provide advanced control features on existing equipment. The system is claimed to be ideal for smaller extruders.

“Dynisco has long been known for its sensing and single-loop technology,” comments Mike Davis, product manager. “Now, with the introduction of OptTrol we can also give customers total polymer melt control in a simple, affordable, expandable package that works as a system with Dynisco sensors and instruments. OptTrol allows users to achieve a complete solution and optimal control from their entire extrusion line.”

A system can be configured with as few as eight zones and can be expanded in convenient increments of eight zones to a maximum of 40 zones of control. This building block approach saves time and money, sats the company. The temperature card was developed with single-screw, twin-screw, co-extrusion or blow-film extrusion applications in mind. Fully automatic adaptive tuning (as well as conventional tuning) is provided. To boost productivity and extend equipment life, the OptTrol system includes an automated heat start-up, which requires no operator intervention.

Dynisco; www.dynisco.com

  • Direct crystallization saves energy

Direct crystallization allows significant energy savings in the production of PET and crystallisable polyester. The CC-PET® process developed by Rieter Automatik and Buhler combines this benefit with the robustness and flexibility expected of stateof-the-art production processes and supplies a dust-free product of stable quality.

The production of different types of polyester today is a large-scale industry with tried and true, cost-effective manufacturing methods. Despite the trend toward plants offering economies of scale and the fine-tuning of all process stages, the largest potential for further cost reductions lies in the interfaces between the different process stages. One such interface exists after the pelleting stage, which links melt-phase polymerization with downstream solid-state polycondensation. This interface can be optimized by direct combination of the pelleting crystallization. This so-called direct crystallization is an eminently important development enabling energy consumption to be reduced during polyester production. It allows the energy contained in the polyester melt to be utilized for the crystallization stage. This direct crystallization eliminates the need for intermediate storage. This offers cost advantages, but at the same time increases the complexity of the overall process because previously independent operations are now combined.

Water-cooled
The direct crystallization process starts at the extrusion die, where the melt is formed into several strands of uniform thickness. Depending on the specific pelleting process applied, the strands will be maintained over a short distance and are partially cooled with water before being cut into pellets. The cooling water is maintained at a temperature of 60 to 95 °C. It is preferably separated from the pellets by a centrifugal dryer, with the pellets then being transferred to a crystallizer. In the crystallizer, the pellets are agitated by a fluidizing gas stream in order to prevent agglomeration. For higher throughput rate, several pelleting systems may converge in a single crystallizer. The total contact time with the water is typically in the range of 1 to 4 seconds. As an option, a screen may be used for separating oversize pellets, dust, and fines.
The main goal of the direct crystallization process is to transfer an optimal amount of energy from the melting process to the crystallization process. This optimum is not determined only by the reduction of energy consumption, but also by additional factors such as process stability, product quality, and operating flexibility. Temperature fluctuations can be balanced by supplying a controlled amount of heat to the fluidizing gas stream. This low “loss” of energy saved ensures permanently constant process conditions and thus a homogeneous product quality. At the same time, the process can absorb a certain portion of cold material from the outside. If the melt-phase polymerization process is temporarily operated independently of the solid-stage treatment, this material can be returned later on to the process – a significant advantage in plants which are sometimes operated for several years without interruption.

Joint development
Rieter Automatik and Bühler AG, the market leaders in the supply of plants for manufacturing PET pellets and in the field of solid-state polycondensation, have jointly developed the Combi-Crystal-PET® (CC-PET®) process. It optimizes direct crystallization for maximum energy savings and process stability. This process can be used both for underwater strand granulation (USG, cylindrical pellets) and for underwater granulation (UWG, spherical pellets). Both granulation systems can be linked directly with the Buhler Q-crystallizer.
A typical application of the CC-PET® process is the production of PET with a low to average comonomer degree and an intrinsic viscosity between 0.55 and 0.9 dl/g. With lower viscosities and higher comonomer degrees, an intermediate conditioning stage is provided in the cooling fluid. An additional benefit of the CC-PET® process is that pellets with a higher surface roughness can be manufactured, which further reduces the stickiness of the pellets. The surface roughness is achieved without the dust generation otherwise typical of crystallization processes applying mechanical agitation. Quite the contrary is true: The CC-PET® process incorporates an integrated dedusting stage.

Uzwil, October 29, 2008

http://www.buhlergroup.com/News/


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