{"author":[{"full_name":"Solbrig, Konrad","id":"59789","first_name":"Konrad","last_name":"Solbrig"}],"page":"453","publisher":"Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky ","ddc":["660"],"user_id":"68554","oa":"1","urn":"urn:nbn:de:gbv:18-ediss-89270","abstract":[{"text":"AbstractThe industrial production ofwood-based compo-sites (WBCs) features the core processes in theforming and press line,which are characterisedby densification and the curing of resin-blended furnish materialto obtain a panel from a formed mat in a continuous or batch-wise process.Here, the reliable measurement of process parameters and panel properties is indispensablefor moni-toring and controllingproductionand quality.The in-plane area density(𝜌A)of the mat and the raw density(𝜌)of the panel,along withits vertical rawdensity  profile  (RDP),aretypically determined through nondestructivemeans of radiometric de-vices.X-ray  systems  for  density  measurement on  WBCsare commonly  usedin both industry and research. Theyfollow a similar basic princi-pleof radiation transmissionwith specificsetups depending  onthe  measuring  taskat  hand.  De-tector  signalsare  evaluated  regarding relative radiation  transmission,  which  is  well-knownto followBeer’s  law  of  exponential  attenuation.Note here, particular conditions regarding radia-tion  (energyand  beam  geometry)  and  material properties  (consistent  and  homogeneous)  are expected. These conditions, however, cannot be consistently  achieved  in  applied  radiometric  in-vestigationson  WBCs [...]","lang":"eng"},{"text":"AbstractXVIIprovided by the present thesis. The practicalim-plementation,  however,must  consequentlybe performed by the device manufactures. The us-ers of such modern X-raysystems are enabledto obtain enhanced quality of their measuring re-sults,  which  is  relevant  for  both  WBC science(wide  range  of  partly  new  composites)  and  in-dustry (increasing requirements on reliability and accuracy).Eventually,  the properapplication  of capable  nondestructive  evaluation  methods  by valid  and  precise  measuring  systems  for moni-toring and controllingquality and processparam-etersin WBC production offersthe possibility ofachievingsavings  in  raw  materials  and  energy consumption   as    well    as   fundamental   ap-proaches forimprovingWBC production, thus,to optimise  processconditionsand  materialprop-ertiesin general.\r\nKurzfassungDie  industrielle  Produktion  von plattenförmigen Holzwerkstoffen  (HWS) wirdmaßgeblich durchdie  Kernprozessein der Form-und Pressen-straßebestimmt. Die Plattenherstellung ist durch die Verdichtung und Aushärtung von geformten Mattenaus beleimtenHolzpartikelngekenn-zeichnet, was in  kontinuierlichen  oder  taktwei-sen Prozessenerfolgt. Dabei ist diezuverlässige Messung von Prozessparametern und Plattenei-genschaften  fürdieÜberwachung  und  Steue-rung  von  Produktion  und  Qualitätunabdingbar. Die Bestimmung des Flächengewichts(Flächen-dichte 𝜌A)der  Matte  und  der  Rohdichte(𝜌)der Platte   sowie   des vertikalen   Rohdichteprofils (RDP) erfolgt für gewöhnlich zerstörungsfrei mit-tels  radiometrischer  Geräte. Heute  sind sowohl in der Industrie als auch in der Forschung Rönt-gensysteme zur Dichtemessung (Densitometrie) an  Holz  und  Holzwerkstoffen verbreitet.  Deren Grundprinzip zur Durchstrahlung ist ähnlich, wo-hingegen sich der jeweilige Aufbau in Abhängig-keit der Messaufgabeund auch in Bezug auf den Geräteherstellerunterscheidet. Die aus den ge-messenen  Detektorsignalen  ausgewertete  rela-tive  Durchstrahlung kann  durch  das  hinlänglich bekannte Beer’scheGesetzfür die exponentielle Schwächungbeschrieben werden. Die Gültigkeit setzt   bestimmte   Bedingungen   in   Bezug   auf Strahlung  (Energie  und  Strahlgeometrie)  und Materialeigenschaften   (konsistentund   homo-gen)  voraus,  die  bei radiometrischen Untersu-chungen an HWSin der allgemeinen Praxis je-doch  nicht angemessen  erfüllt  werden  können [...]","lang":"ger"}],"main_file_link":[{"url":"https://ediss.sub.uni-hamburg.de/handle/ediss/8756 ","open_access":"1"}],"status":"public","keyword":["density measurement","radiation transmission","porous low-Z composite material","true density","elemental composition and ash content","effective atomic number","mass attenuation coefficient","X-ray energy spectrum","law of attenuation","beam hardening and radiation build-up","radiation-physical interdependencies","Dichtemessung","Durchstrahlung","poröser Verbundwerkstoff","Reindichte","elementare Zusammensetzung und Aschegehalt","effektive Ordnungszahl","Massenschwächungskoeffizient","Röntgenspektrum","Schwächungsgesetz","Strahlaufhärtung und Strahlungsaufbau","strahlungsphysikalische Wechselbeziehungen"],"citation":{"mla":"Solbrig, Konrad. <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky , 2019.","ieee":"K. Solbrig, <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky , 2019.","havard":"K. Solbrig, Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry, Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky , Hamburg , 2019.","chicago":"Solbrig, Konrad. <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky , 2019.","short":"K. Solbrig, Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry, Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky , Hamburg , 2019.","bjps":"<b>Solbrig K</b> (2019) <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky .","apa":"Solbrig, K. (2019). <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky .","ufg":"<b>Solbrig, Konrad (2019)</b>: Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry, Hamburg .","chicago-de":"Solbrig, Konrad. 2019. <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky .","ama":"Solbrig K. <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky ; 2019.","din1505-2-1":"<span style=\"font-variant:small-caps;\">Solbrig, Konrad</span>: <i>Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry</i>. Hamburg  : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky , 2019","van":"Solbrig K. Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry. Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky ; 2019. 453 p."},"type":"dissertation","supervisor":[{"last_name":"Ressel","first_name":"Jörg","full_name":"Ressel, Jörg"},{"full_name":"Thömen, Heiko","first_name":"Heiko","last_name":"Thömen"}],"place":"Hamburg ","alternative_title":["Angewandte Untersuchungen an Holzwerkstoffen im Zusammenhang mit der Dichtemessung mittels Röntgenstrahlung"],"language":[{"iso":"eng"}],"title":"Applied Investigations on Wood-Based Composites in the Context of X-Ray Densitometry","date_created":"2021-02-09T09:31:41Z","date_updated":"2023-03-15T13:49:56Z","_id":"4919","year":2019,"publication_status":"published"}