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Issue 05/2016

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3D Printing Improved

3D Printing Improved heat resistance Printing with filaments based on PLA L175 resin resulted in end-applications with a higher heat resistance than those printed with standard PLA filaments. Fig. 4 demonstrates the performance of the PLA types when a 3D printed cat is exposed to a temperature of 80 °C for one hour. It is believed that the use of enantiomerically pure PLA (PDLA or PLLA content >99 %) in general, preferably enriched with a nucleating agent, results in an increased heat stability of 3D printed shaped articles. Depending on the design of the shaped articles, the need to print in a heated chamber, or the inclusion of a post annealing step, can be avoided under these conditions. Conclusions The study showed that printing with Corbion L175 enantiomerically pure PLLA resin resulted in a printing performance comparable with standard PLA (speed and resolution). In addition, PLA L175 displayed better aesthetics and an improved resistance to elevated temperatures in the final printed part when compared with standard PLA, without the need for a post annealing step or the use of a heated chamber. 3D printed parts based on Compound C showed similar properties and aesthetics to ABS, without the need for post annealing or the use of a heated chamber. 5B22 Standard PLA filament Standard PLA filament High heat PLA filament based on PLA L175 High heat PLA filament based on PLA L175 Figure 4: comparative results of 3D printed cats after heat treatment. PLA L175 displayed an improved resistance to elevated temperatures in the final printed part (better retention of its structural integrity) when compared with standard PLA. (tests conducted by Corbion). 3D printing 3D printing, or additive manufacturing, is a generic term for various technologies designed to achieve solid three dimensional models. The model is designed in 3D modeling software and the file uploaded to the printer, which then builds up the model layer-by-layer. There are several different printing technologies, which differ in the way the layers are built. The most common, and the focus of this article, is Fused Deposition Modeling (FDM) whereby the model is built by means of an extrusion process. A heated nozzle melts a plastic filament and builds up the model by depositing thin layers of the molten plastic in horizontal and vertical direction. Once a layer is finished, the nozzle moves upwards and the next layer is printed. Magnetic for Plastics • International Trade in Raw Materials, Machinery & Products Free of Charge. • Daily News from the Industrial Sector and the Plastics Markets. • Current Market Prices for Plastics. • Buyer’s Guide for Plastics & Additives, Machinery & Equipment, Subcontractors and Services. • Job Market for Specialists and Executive Staff in the Plastics Industry. Up-to-date • Fast • Professional 46 bioplastics MAGAZINE [05/16] Vol. 11

Polyurethanes & Elastomers Bioplastic for bio tube tie In response to growing market and consumer demand for sustainable products API Spa (Mussolente, Italy) has adopted a new strategy called Bio & Beyond which is focused on the development of new families of biodegradable materials and a wide range of biobased biomaterials. The APINAT family includes both rigid and soft biodegradable compounds derived from synthetic sources which present mechanical and thermal characteristics as well as processability which is comparable to traditional polymers while providing sustainable and environmentally friendly solutions. Since the development of the first soft biodegradable compound Apinat in 2007, API has perfected the formulation of the compounds to enable transformation through extrusion. The extrusion process requires the material to have specific rheological properties as well as good thermal stability. Apinat DP 1888 grades have been specifically developed to be transformed into soft tubes and profiles through extrusion while Apinat DP 1888 compounds are fully Biodegradable according to European Standard EN13432. The grades, available from 60 to 90 Shore A hardness, are also food approved in compliance with European Union Regulation (EU) No 10/2011. By: Aldo Zanetti API S.p.A. As a result of a collaboration between API Spa and Cordioli Srl (Valeggio sul Mincio, Italy), a leading company in the agriculture and garden sector, a new biodegradable tube tie for use in agricultural has been developed. This biodegradable tube tie, called BIOFILO ® , has been produced based on the experience of Cordioli Srl in tube extrusion and API’s APINAT DP 1888 new compounds. Today, in Europe alone, the estimated annual consumption of tube ties in vineyards and fruit gardens is as much as 5,000 tonnes. Nearly all tie tubes are made from conventional PVC. After a certain time, the tube ties fall to the ground and, if not recovered, contaminate the soil with plastic. Biofilo has the same use and mechanical characteristics as traditional PVC tube tie but it has a unique advantage: it will biodegrade when in contact with the grass. Biofilo is biodegradable in an aerobic environment in accordance with EN 14995 and ASTM D6400 standards. Biofilo is also easy to colour and provides a good, strong tie for up to two years, exceeding the length of time these ties are expected to last. The increasing adoption of bioplastics by today’s ecoconscious farmers and consumers will help save fossil resources, reduce the carbon footprint and decrease greenhouse gas emissions. 6A42 Mussolente, Italy bioplastics MAGAZINE [05/16] Vol. 11 47

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