JOHANNESBURG, South Africa, Dec. 15, 2014 (Press Release) -In response to lively customer interest for rain-repellent paper bags, Mondi has developed the Splash Bag. This new bag resists rain for up to two hours and withstands humidity better than a standard paper bag.
Standard paper bags for packaging cement and other powdery products are generally vulnerable to rain. To tackle the issue, Mondi, working in collaboration with major cement producer Lafarge, has developed an innovative rain-repellent bag particularly suitable for cement. The new wet-strengthened, machine-finished Splash Bag is designed to absorb less moisture than conventional bags. Its outer ply of Mondi Advantage Protect sack kraft paper has a water-repellent surface and is formulated to keep high tensile strength even in a wet environment. It also helps prevent moisture ingress if conditions are damp or humid during storage. Advantage Protect sack kraft papers have a water-repellent surface and are formulated to have high tensile strength, to help prevent rupture. For example, Advantage Protect in a grammage of 80 g/m2 has a tensile strength of 5.6 kN/m in the machine direction - an impressive figure.
Splash Bag's water-resistive properties are immediately apparent in side-by-side visual testing versus standard paper cement bags (test conditions simulating direct exposure to rain). "Water gathers on the bag's surface without being absorbed, then evaporates over a period of several minutes, leaving the bag essentially dry," explains Claudio Fedalto, Deputy COO Mondi Industrial Bags. "By contrast, the standard bag absorbs the water, weakens as a result and may potentially rupture if exposed to extremely wet conditions," he adds. Results of Cobb tests, which measure the amount of water absorbed into the surface by sized paper over a set period of time, indicate that Splash Bags are resistant to rain for nearly two hours. If inadvertently left in damp (rather than wet) conditions, e.g. on damp sand, Splash Bag resists moisture ingress for up to 12 hours.
Even after two hours of direct exposure to rain, Splash Bags can be moved, handled and emptied without any difficulties. Bag breakage rates are significantly reduced, leading to genuine cost savings: fewer broken bags translate to lower vehicle and site clean-up costs, fewer trips from warehouse to site, as well as time savings for logistics and site managers. Excellent moisture resistance can also mean better protection of the filling good if conditions are damp or humid at the warehouse.
Importantly, none of these advantages comes at the expense of filling speeds or de-aeration rates, which match those of standard bags (in tests performed on Mega Gurley equipment at Mondi's Bag Application Centre in Austria).
According to interviews carried out at construction sites, Splash Bag has already won generous plaudits from construction workers for its ability to resist rain and moisture when used to package cement. The construction workers surveyed were particularly impressed that the bag shrugs off rain and remains strong and easy to handle even under damp conditions.
About Mondi Industrial Bags
Mondi Industrial Bags, a business segment of Mondi's Europe & International Division, is the leading international producer of industrial paper bags, selling around 5 billion bags per year. Thanks to its broad range of bag specifications, Mondi Industrial Bags serves major industries including cement and building materials, chemicals, food, feed and seed. The business segment operates a dense sales and service network, the specialised filling equipment department Natro Tech, as well as its Bag Application Centre, where researchers develop and test innovative packaging solutions.
Mondi is an international packaging and paper Group, employing around 24,000 people in production facilities across 30 countries. In 2013, Mondi had revenues of €6.5 billion and a ROCE of 15.3%. The Group's key operations are located in central Europe, Russia, the Americas and South Africa.
The Mondi Group is fully integrated across the packaging and paper value chain - from the management of its own forests and the production of pulp and paper (packaging paper and uncoated fine paper), to the conversion of packaging paper into corrugated packaging, industrial bags, extrusion coatings and release liner. Mondi is also a supplier of innovative consumer packaging solutions, advanced films and hygiene products components.
Mondi has a dual listed company structure, with a primary listing on the JSE Limited for Mondi Limited under the ticker code MND and a premium listing on the London Stock Exchange for Mondi plc, under the ticker code MNDI. The Group's performance, and the responsible approach it takes to good business practice, has been recognised by its inclusion in the FTSE4Good Global, European and UK Index Series (since 2008) and the JSE's Socially Responsible Investment (SRI) Index since 2007.
 Based on sales volume. Source: Eurosac, Freedonia World Industrial Bags 2011 study prepared for Mondi and management estimates.