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Thin Gauge Films Secure Heavy Loads
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Thin Gauge Films Secure Heavy Loads - 1

FILM PRODUCTION Thin Gauge Films Secure Heavy Loads Logistics. In November 2012, Windmöller & Hölscher KG (W&H), Lengerich, Germany held a symposium on “Load Stability” for a diverse global audience consisting of film converters, multinational packaging end users, polymer suppliers and logistics companies, as well as responsible members of the traffic police. One of the symposium’s key messages was that the whole Melt curtain length and melt temperature are crucial factors to quality consistency (figure: W&H) process chain from the resin up to the wrapping machine needs to be considered. A case study was introduced showing that even in a bulk commodity market such as stretch films there is the opportunity to develop “value added“ products. TORSTEN SCHMITZ ET AL. n the majority of applications, stretch wrap film is the most economic solution for achieving proper palett load stability. However, stretch film in Europe is a pure commodity product – predominantly driven by price per kg – and the whole industry faces severe price pressure. While multinationals are ever more driven to reduce the carbon footprint of their products and legislation in Europe is strongly focussing on the security aspect of transportation and logistics, there is a huge opportunity for converters to introduce “added value” stretch films to the market. To develop such products successfully, it takes the combination of resin, machinery, process, wrapping and testing knowhow, as described in the following case study. Translated from Kunststoffe 7/2013, pp. 59–63 Article as PDF-File at www.kunststoffeinternational.com; Document Number: PE111376 The Consignor is Responsible During the symposium, Professor Marc Juwet from KU Leuven outlined current EU and IMO directives and their impact on responsibilities of the consignor, shipper and haulier. According to the directives, the consignor is responsible that packages and unit loads are suitable to withstand the stresses expected under normal transport conditions, be it road, train or ship. From a legal standpoint, the securing system should prevent all movements of all parts of the cargo. According to the current understanding, this means that all load units should behave as a rigid block. This being said, a palett transported on the road must withstand a brake acceleration of 0.5 g while remaining completely rigid. Besides “real life” – but very expensive – truck braking tests, wrapped paletts can also be tested on a so-called acceleration test (Fig. 1). In this test, a palett is accelerated and the behaviour of the load is documented with a high speed camera. During approximately 2,500 acceleration tests done within the last years, roughly 70 % of the paletts were not rigid, 20 % were rigid but too expensive, and only 10 % of the paletts were optimized. Keeping in mind that an estimated 4 % of all transported goods in Europe are damaged upon arrival, there is clearly a huge potential for improvement along the complete process chain [1, 2, 3]. The key factors influencing load stability, using stretch film, are shape and friction coefficient of secondary packaging units, stacking pattern on the palett, application of tie sheets, bottom roping for a good connection between load and palett, wrapping pattern, selection of suitable stretch film and appropriate wrapper settings. Stretch Film and Wrapper This case study will focus on the combination of the latter two items and describe © Carl Hanser Verlag, Munich Internet-PDF-Datei. Diese PDF Datei enthält das Recht zur unbeschränkten Intranet- und Internetnutzung, sowie zur Verbreitung über elektronische Verteiler. Eine Verbreitung in gedruckter Form ist mit dieser PDF-Datei nicht gestattet.

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Thin Gauge Films Secure Heavy Loads - 2

FILM PRODUCTION Fig. 1. Acceleration test at ESTL nv, Deerlijk, Belgium (figure: ESTL) the development of stretch film used to achieve reliable load stability, while being a more economic solution than many other currently available films. Beginning of 2012, W&H installed a Filmex cast stretch extrusion line at Ergis-Eurofilms S.A. in Olawa, Poland. The primary focus of this line was to produce high performance machine film that would primarily be used in high-speed wrappers that can go beyond 300 % prestretch. The line is equipped with a Cloeren 33-Nanolayer feedblock and a total of seven...

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Thin Gauge Films Secure Heavy Loads - 3

FILM PRODUCTION Alternating nanolayer structure Uniform nanolayer structure Exceed mPE resin and VM PBE alternative Exceed mPE resin and VM PBE alternative Non-cling/slip layer 95 % Exceed mPE 3518CB 5 % Vistamaxx PBE 6102 100% Vistamax PBE 6102 Non-cling/slip layer 100 % Exceed mPE 3518CB 100% Vistamax PBE 6102 Cling layer Fig. 4. Improvement in puncture resistance through use of Nanolayer film structures (figure: ExxonMobil Chemical) Fig. 5. Impact of wrapping pattern and wrapper settings on load stability (figure: Test D with a 12 µm nanoErgis SPPV film then showed that a further...

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Thin Gauge Films Secure Heavy Loads - 4

FILM PRODUCTION 400 SPPV 22 µm SPPV 15 µm beverage industry, a conventional 20 µm film was replaced by nanoErgis SPPV 35 µm film. By changing the prestretch level to 300 %, the number of wraps was reduced from 26 to 19 and thus the number of wrapped paletts was increased from 55 to 67 per hour. Using the film at this high prestretch level also increased the load holding force by 34 %. Fig. 6. Downgauging potential in wrapping application Fig. 7. The 12 µm SPPV does not exert sufficient holding force for this type of load SPPV 20 µm SPPV 17 µm SPPV 15 µm SPPV 12 µm Fig. 8. Films of different...

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