Plastic? Yes, please!
In quite some cases plastic packaging is more environmentally friendly than other materials. A recent study shows that plastic sacks are the most sustainable packaging solution for cement: AD*STAR cement sacks made of coated polypropylene fabric achieve considerably better results than sacks made of paper or recycled polypropylene tape fabric.
AD*STAR cement sacks are made of PP tape fabric and produced with the patented AD*STAR sealing technology. ©Starlinger
The effects on the environment, a much discussed topic regarding plastic bags for everyday use, also play an increasingly important role for industrial packaging. A new study which compares different types of cement packaging now proves that woven plastic packaging is the most environmentally friendly solution for this application. The results of the life-cycle-analysis, carried out by the German PE INTERNATIONAL AG (now thinkstep AG) and commissioned by the Austrian machinery supplier Starlinger & Co. Ges.m.b.H., clearly show that AD*STAR sacks – welded block bottom valve sacks made of coated polypropylene tape fabric – have lower global warming potential (also known as carbon footprint) than paper sacks or sewn PP sacks which are widely used especially in Asia. For comparison, sewn sacks made in China as well as kraft paper sacks made in Saudi Arabia were analysed; all sacks had a filling capacity of 50 kg cement.
The results are clear: The AD*STAR sacks developed by Starlinger do not only show the lowest values regarding global warming potential, they are also the most environmentally friendly packaging in terms of acidification potential (acid rain), ozone depletion potential, photochemical ozone creation potential (causes summer smog), as well as energy and fresh water consumption.
Low breakage rates – smaller CO2 equivalent
A decisive factor for the positive results of AD*STAR sacks are the low breakage rates in the course of the life cycle of the sacks. For the production of the AD*STAR sacks analysed in the study, 100 % virgin material was used both in China and Saudi Arabia. Due to the special production process AD*STAR sacks are extremely robust despite their very low weight. The strength and resistance results in breakage rates below 1 % in the entire life-cycle, while paper bags and sewn sacks have breakage rates between 2.3 % and 4.4 %. This means that if AD*STAR sacks are used, less cement is lost and must be replaced, and less packaging is needed – consequently, less greenhouse gases are produced.
Great savings potential for greenhouse gases
The study analyses the environmental impact of the sacks during their entire life-cycle – from raw material to the disposal of the sack. Raw material production, sack production, filling, transport and storage until disposal – by means of landfill, recycling or thermal utilisation – were analysed.
Starlinger has commissioned the study with comparable products from China and Saudi Arabia because the type of cement packaging analysed forms the biggest share on the cement market in the respective country. In China, the world’s biggest cement producer, around 20 billion sewn cement sacks made of polypropylene tape fabric with recycled content are produced. In the study, sacks made of 50 % virgin material mixed with 50 % recycled material, and sacks made of 100 % recycled material were analysed. The quality of the sacks is comparatively low because the recycled material used to produce the sacks is in most cases severely degenerated, i.e. the necessary level of strength can only be achieved by increasing the fabric weight. In addition, the sewing process further weakens the material by up to 50 %. Sewn cement sacks have significantly higher breakage rates and thus cause considerable cement loss which has to be compensated by additional production. Changing over to AD*STAR sacks does not only reduce CO2 emissions caused during production and relieve the environment, it also helps to automatize the entire cement filling and transporting chain – a process that is already underway considering the current investments in modern equipment on the Chinese cement sector.
In Saudi Arabia, one of the biggest producers and exporters of plastic granulates worldwide, imported paper is used for cement packaging. Thus, two- and three-layer kraft paper cement sacks were analysed in the study. In this case, switching over to the more robust AD*STAR sacks would not only prevent the loss of countless tons of cement caused by sack rupture, but also greatly reduce raw material input for sack production and avoid long transport routes. In addition, the entire value created by both raw material and sack production would remain within the country.
More than 7.5 billion sacks per year worldwide
The worldwide used AD*STAR sacks have been developed and patented by the Austrian mechanical engineering company Starlinger & Co. Ges.m.b.H. The company is a leading supplier of machinery and complete plants for the production of woven plastic packaging and has installed AD*STAR production plants with a total yearly capacity of more than 7.5 billion sacks all over the world.
Note: AD*STAR® is a registered trademark. AD*STAR® sacks are exclusively produced on Starlinger machinery.
About Starlinger & Co. Ges.m.b.H.:
Starlinger is a Vienna-based engineering company with production sites in Weissenbach and St. Martin, Austria, as well as Taicang, China. As the world’s leading supplier of machinery and complete lines for woven plastic bag production and PET recycling and refinement, Starlinger & Co. Ges.m.b.H. is a synonym for leadership in quality and technology in over 130 countries. Founded in 1835, the family-owned business has been exporting machines worldwide for more than 45 years with an export quota of over 99.5 %.
Branches in Brazil, China, India, Indonesia, Russia, South Africa, USA and Uzbekistan ensure quick and professional technical support and service.
Ms. Sigrid Eder
Starlinger & Co. Ges.m.b.H.
Sonnenuhrgasse 4, 1060 Vienna, Austria
T: +43 1 59955-1251
F: +43 1 59955-180
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