B4-CV-19-D g DS form with thread according to DIN Ra LSSD H Bevel-helical gear reducer B4

Flender/Flender Gear Units/Bevel-helical gear reducer B4

these resins their content of basicalkaline salts (sodium hydroxide, potas- sium hydroxide and potassium carbonate) influenced the combustion process in an unfavour- able way. An essential influence of the wood-based material' structure on the combustion behaviour was not found. Further investigations were directed at coated materials. Wood-based materials coated with veneers and papers impregnated with artificial resins showed -according to size -an equal or worse combustion behaviour compared to uncoated wood-based material. The combustion behaviour of large pieces was significantly worse, smaller off-cuts did not or only slightly suffer from an unfavourable influence of the coating. Fundamental differences between uncoated and coated wood-based materials were only found for coatings with thermoplastic foils based on PVC and for some pigmented lacquer coatings. An actual problem was the formation of gaseous and vapourous halogen compounds, mainly hydrogen chloride. Emissions of HCI can be enerated from the combustion of organic and inorganic chloride compounds contained in # fuel. Natural wood contains chloride, fluor and other halogens only as trace elements and, there- fore, turned out to be almost emission-free. In contrary, particleboards, plywood and MDF bonded with UF-resins mostly contain 0, to 0,3% of ammonium chlorideand sometimes also small quantities of sodium chloride (common salt). The investigations run with the low power rating combustion facility of the institute as well as with industrial combustion plants showed that the mentioned inorganic salts did not emit gaseous and vapourous chloride combinations or only in small quantities. Nevertheless, in combustions plants - mainly in the furniture industry burning wood residues, 'there were found very high emissions of hydrogen chloride (HCI).The individual values ranged between 6 and 8 mg/m3. Further investigations showed that these high HCI emissions always were depending o