01/29/2013

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75 years of Perlon: from ladies' hosiery to tough hawsers for ships

The synthetic material discovered by Paul Schlack 75 years ago, on 29 January 1938, still has a diverse range of applications. The fibre first made its name through its use in Perlon stockings in the 1950s. Today, however, it no longer adorns women's legs but is instead used as a strong plastic filament in tough hawsers for ships, fishing lines, field fencing, and lines for oyster baskets. In addition to Perlon, this range of plastics also includes the Bayco and Atlas brands and is manufactured by Perlon-Monofil, a 100 % subsidiary of Lanxess. Based in Dormagen, Germany, Perlon-Monofil employs 110 people and develops and produces more than 60 million km of plastic fibres, or monofilaments, per year. That is about the same as the distance from Earth to Mars. Among other things, the monofilaments are used in industrial fabrics, paper machine clothing, trellises and staple wires for wine and fruit growing, and fishing lines for sports fishing.[image_0]Giants of the seas held fast with hawsers from Perlon-Monofil The plastic is also important in the production of ships' hawsers. All over the world, these hawsers have been securing tankers and container ships to dry land for almost 50 years. Each year, the company produces around 27,000 km of monofilaments for use in the shipping industry. The plastic filaments are then combined with an additional special fibre and made into Atlas brand ropes at three plants in Germany, Belgium and South Korea. Approximately 360 km of ropes and cables are produced per year, ranging from 20 - 95 mm in thickness. The strength of the fibres is proven by the load tests - the strongest rope must withstand a tensile force of 190 t. Other test criteria include resistance to sea water, buoyancy, strength and flexibility.[image_1_right]Innovative, sustainable oyster farming However, plastic filaments from Perlon-Monofil also play a very different role in the marine environment, with the monofilaments helping oyster farmers in Australia. The oysters grow in baskets attached to plastic lines "Made in Dormagen”. These lines are used to pull the baskets up to the surface of the water and then lower them again, so that the oysters can be cleaned and their growth monitored. This method is proven to put less of a strain on the delicate maritime ecosystem. In contrast, oyster farms where the oysters are cultivated on the seabed require young oysters to be placed upon a suitable substrate. Once they have grown to the required size for sale, they are collected in dredging nets. The disadvantage of this is that the nets can cause significant damage to the seabed and the flora and fauna that live there. The nets can also trap unwanted bycatch.The development of the "BST Adjustable Longline Oyster Farming System” is regarded as an example of best practice worldwide. This system is not only more versatile and less costly than conventional methods, it also involves less work, lower maintenance costs, and higher yields. The oysters grow better and reach their full size more quickly. BST Oyster Supplies uses monofilaments made by Perlon-Monofil in its adjustable oyster farming system, winning the company the prestigious National Landcare Award presented by the Australian government in recognition of innovative, sustainable agricultural practices.[image_2]For better connections Monofilaments from Perlon-Monofil have also made their mark in the communications and electrical engineering sectors. The flexibility of these monofilaments, coupled with their diameter accuracy, tensile strength and durability, makes pulling wires manufactured under the brand names Atlas and Bayco dependable and robust tools for industry and craftsmen alike. Special UV-, heat- or weather-resistant monofilaments satisfy a variety of requirements in industrial applications.State-of-the-art technology Perlon-Monofil uses the very latest technology. For example, a high-speed extrusion facility turns high-performance plastics from Lanxess into up to 900 m of monofilament every minute - that is almost twice as fast as conventional systems. Thanks to special winder technology, it is even possible to produce very thin monofilaments measuring less than 0.1 mm in diameter. The overall annual capacity of Perlon-Monofil is well over 5,000 t.

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