© GRI Glasrecycling GmbH   
Business Services Glass Recycling Contact Glass Impressions GRI Glasrecycling GmbH

From waste glass to a                        

high-quality product

Today, waste glass cullet forms a fundamental factor of production in the energy-intensive industry of producing glass products and allows a saving of up to 25 % energy. Because of high input quantities, enormous requirements to the quality of the treated cullet are made to ensure a production process that is to the greatest possible extent trouble-free. The treatment of waste glass, whether from bottle banks or from the bottling beverage and food industry (bottler cullet), strongly demands a complex multi-stage process. Goal of this treatment process is the production of a raw material that is  as far as possible cleaned of any components that might negatively influence the product quality. For this, sorting for the materials that is described as follows takes place. In the first step of the process, impurities that can be separated by hand such as plastic bags and other debris are removed during the manual presorting. Afterward, an overband magnet separates loose ferrous metals (lids, cans, caps, etc.) from the glass flow. This sorting stage aims at relieving the following, fully automated sorting process since a maximum efficiency is required to achieve high product quality. The fraction previously cleaned from debris and ferrous metals is now conducted to large-scale sieve systems. There the glass flow is split up into different grain sizes (fine grain, medium grain, coarse grain) to provide a precisely defined grain band to the opto-electronic sorting machines  using high-resolution camera technology. The finest fraction (< 5 mm) which is not suitable for treatment by so-called ceramics/stone/porcelain/off-color sorting machines with the technology available today, is directed to existing CSP technology. After reducing loose organic components over suction nozzles and removing NE metals using eddy current separators, this fraction rejoins the main flow. The partial flows in the grain size of 5 – 60 mm are conducted over lead glass separators (Clarity-Lead devices) before they are screened by CSP/HR/color sorting machines to remove lead-containing cullet which can then be put to an alternative use. The lead glass sorting machines used here function at a heavy metal content of the glass starting at 0,5% and are currently the most efficient model regarding screening technology (Clarity- Binder) that is available on the market. The fraction > 60 mm which cannot be sorted at this seize is transported to crusher systems. Caps are separated from the bottle neck through the following crushing process and can be removed by metal separators. The resulting glass waste is redirected to the glass flow and is therefore not lost for the recycling process. Effectively working suction systems remove unwanted light-weight materials such as parts of plastic bags, labels, plastic rings, various caps/individual parts of caps prior to reaching the sorting machines. Additional metal detection and separation systems lead to another reduction of impurities in the product flow. A central process control system early detects errors in technical processes so that corrective measures can be taken if necessary. In doing so, a stable and continuous production process is ensured. At the end of the production stands color-sorted glass granulate that has to live up to the standards of the German and the international glass industry so that the infinite circuit of glass packaging stays closed. Only the interplay of skilled and motivated personnel, effective organization and efficient technology can ultimately lead to the high- quality secondary raw material glass granulate.
Privacy Policy Imprint Sitemap