MONDI INDUSTRIAL BAGS

Further progress in the evolution of industrial paper bags

Conventional industrial bags made of paper tend to be vulnerable to rain and moisture. When exposed to direct rain on an unprotected pallet, a standard paper bag absorbs water and may weaken as a result. Handling may then become awkward, and the shelf life of the contents may be affected. In some cases, a switch to plastic bags is the answer. But this may not be the optimum approach, as the cost of investing in form-fill-seal (FFS) machinery tends to be high. Mondi, from Vienna/Austria, has come up with a hybrid solution to the dilemma: the H­ybridPRO bag, offering the advantages of a plastic bag, yet fillable on conventional paper bag filling systems.

With the new bag material, paper combined with plastic really can provide the best of both worlds: uncompromising weather protection thanks to the bag’s outer PE barrier layer, allowing genuine outdoor storage for lengthy periods and extended storage stability, without the need to invest in expensive FFS filling systems.

The HybridPRO bag, which will be marketed under the slogan “Made of PaPEr – combining the best of both worlds”, represents a whole new concept in industrial bag design. Like a hybrid drive in a car, the new bag material is an excellent combination of the available options: the inner ply is made of 120 g/m2 Mondi A­dvantage One sack kraft paper; the outer ply is a 40 μm-thick layer of high-density polyethylene (HDPE). The innovative step here is that the HDPE forms a protective layer on the outside of the paper. Other bags also use a combination of paper and plastic, but not in this way. This is a considerable technical achievement that brings a new dimension to industrial bag design.

The bag is particularly suitable for building materials, including gypsum and cement, as well as many other moisture-sensitive products. It is suitable for filling contents at temperatures of up to 90 °C. The HybridPRO enjoys excellent protection against direct rain during shipping or on site and as well as against gradual moisture ingress during outdoor storage, thanks to the 40 μm thickness of the unperforated HDPE film. This means shelf life is longer than with standard paper bags. For example, according to building materials producer Knauf, who collaborated in developing the new bag, gypsum packaged in the HybridPRO enjoys an eight-month shelf life when stored outdoors with no further protective layer – twice as long as if packaged in a standard paper bag.

This impressive performance outdoors makes the bag very user-friendly and has benefits when it comes to streamlining the supply chain of fillers and end-consumers: with longer shelf life, order sizes can be larger, for potential reductions in shipping costs.

The HybridPRO allows high-speed filling, with de-aeration twice as fast as with a standard three-ply bag (35 m3/h versus 18 m3/h tested on Mega Gurley equipment at Mondi’s R&D centre BAC in Austria). Since the bag’s HDPE film has anti-slip properties, there is no need to apply anti-slip substances during production. The anti-slip properties ensure safe handling during shipping. Workplaces, such as construction sites, are cleaner with the HybridPRO, as less of the contents adhere to the outer layer – a benefit sure to appeal to end users.

The HybridPRO is an eco-friendly solution: the total grammage of material used is less than with standard three-ply designs used for the same purpose. In addition, the plastic and paper components are easy to separate, for optimum re­cyclability.

www.mondigroup.com/hybrid-pro

Related articles:

Issue 2013-05

Mondi’s industrial bags plants FSCTM and PEFCTM certified

17 of Mondi’s industrial bags plants have successfully been Chain of Custody certified according to FSC and PEFC standards as of February 2013. This multi-site certification was chosen to answer the...

more
Issue 2013-06

Cement industry switches to two-ply bags

In less than a year the Vienna/Austria-based Mondi Kraft ­Paper and local converters have successfully encouraged much of the South African cement market to use two-ply bags made with Mondi high...

more
Issue 2019-9 MONDI INDUSTRIAL BAGS GMBH

Mondi introduces the first all-in-one customer platform for paper sacks worldwide

Customers of Mondi Industrial Bags can now enjoy the convenience of 24/7 customer service through the new myMondi web-based platform. It is the first all-in-one digital customer platform available in...

more
Issue 2015-4 MONDI

Rain-resistant Splash Bag launched

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...

more
Issue 2017-7-8 MONDI GROUP

Building & construction sector in the focus of Mondi’s interpack presence

From 04.05.–10.05.2017, the international packaging and paper group Mondi highlighted its solutions for customers in the building & construction sector at the interpack in Düsseldorf/Germany....

more