Roffael, Edmone

[["dc.bibliographiccitation.firstpage","819"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","822"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Behn, Claus"],["dc.date.accessioned","2018-11-07T09:04:15Z"],["dc.date.available","2018-11-07T09:04:15Z"],["dc.date.issued","2012"],["dc.description.abstract","A comprehensive literature survey and the results of investigations clearly show that the influence of resin level in particleboards on the perforator value (EN 120) depends on the molar ratio of the resin used as a binder. In case of high molar ratio resins (F:U 1.6:1) increasing the binder content in the boards leads to an increase in the perforator value of the boards. In contrast, boards bonded with very low molar ratio aminoplastic resins with molar ratio F:U of 1:1 (F:NH2 0.5:1) or even lower do not show any noticeable increase in the perforator value on raising the binder level. On the contrary, the measured perforator values may sometimes decline due to increase in the resin content in the boards. The perforator test seems to include two main processes taking place alongside each other: the physical extraction of free formaldehyde and the chemical hydrolysis process of the resin itself, induced by the moisture content of the boards. In case of low molar ratio resins, particularly at very low molar ratios (F:U 1:1 or even lower), free urea may also be present in the resin or added to the resin as a scavenger. Urea seems to react with extracted formaldehyde at high temperature during the extraction process. This lowers the perforator value without necessarily decreasing the emission at ambient conditions. Insofar, inextricably intertwined chemical processes seem to unfold during the extraction process. Additionally, the results show that subtle differences in the perforator value in the very low formaldehyde emission region may remain without noticeable impact on the emission measured by the chamber method (EN 717-1)."],["dc.identifier.doi","10.1007/s00107-012-0622-y"],["dc.identifier.isi","000309868500006"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8786"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25074"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","On the influence of binder content in particleboards bonded with resins of high and low molar ratio on the formaldehyde release measured by the perforator method"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","233"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","235"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Baer, Gert"],["dc.date.accessioned","2018-11-07T08:30:17Z"],["dc.date.available","2018-11-07T08:30:17Z"],["dc.date.issued","2009"],["dc.description.abstract","IR-spectra of TMP and CTMP prepared from pine wood and UF-bonded MDF made from pine wood show characteristic differences. The typical band for carbonyl groups (C=O-groups) at wave number about 1740 cm(-1) is strong in pine wood, but appears relatively weak in TMP and especially in CTMP made thereof. In UF-bonded MDF made from pine wood the band at about 1740 cm-1 is very weak compared to that in pine wood. Moreover, no significant difference in the IR-spectrum between TMP and CTMP made from UF-bonded MDF seems to exist. This is attributed to the fact that during thermo-mechanical pulping of UF-bonded boards hydrolytic degradation of the resin takes place enhancing the formation of ammonia which increases the pH-value of the fibres and leads therefore to chemo-thermo-mechanical pulping."],["dc.identifier.doi","10.1007/s00107-009-0314-4"],["dc.identifier.isi","000267042900017"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3472"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16853"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","IR-spectra of TMP and CTMP prepared from pine wood and medium density fibreboards (MDF)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","121"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","128"],["dc.bibliographiccitation.volume","68"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Baer, Gert"],["dc.date.accessioned","2018-11-07T08:43:31Z"],["dc.date.available","2018-11-07T08:43:31Z"],["dc.date.issued","2010"],["dc.description.abstract","The work is related to the use of thermomechanical pulps (TMP) prepared from recycling UF-bonded particle- and fibreboards as a partial substitute for TMP made directly from wood in MDF. The results reveal that TMP from recycling boards show striking differences in their morphological characteristics and chemical properties compared to TMP prepared directly from wood. TMP from recycling boards are of shorter fibre length and higher content of fine fraction. Moreover, their cold water extractives are of higher pH-value and contain appreciably higher amounts of acetate and formate ions. TMP from recycling boards releases also more formaldehyde compared to TMP made directly from wood. Moreover, the results clearly show that TMP from recycling boards can be used up to 30% as a partial substitute for TMP from wood in making UF-bonded MDF without any noteworthy deterioration of the physical-mechanical board properties. Also, the formaldehyde release of the boards made using TMP from recycling boards experiences no negative change. Only small differences were found in the content of formate and acetate ions as well as in the release of volatile acids from MDF made from recycling fibre- and particleboards on the one side and boards directly made from wood on the other side. All the results indicate that chemical interaction seems to take place between the chemically degraded resin in UF-bonded recycling boards and the new binder used in making MDF."],["dc.identifier.doi","10.1007/s00107-009-0376-3"],["dc.identifier.isi","000277138900001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4230"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19987"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Use of UF-bonded recycling particle- and fibreboards in MDF-production"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","911"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","912"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Dix, Brigitte"],["dc.date.accessioned","2018-11-07T09:04:15Z"],["dc.date.available","2018-11-07T09:04:15Z"],["dc.date.issued","2012"],["dc.description.abstract","The emission of formaldehyde from softwood particles, as measured by the flask method (EN 717-3), depends highly on the particle size. Therefore, no definite value for the formaldehyde release from wood can be given."],["dc.identifier.doi","10.1007/s00107-012-0625-8"],["dc.identifier.isi","000309868500020"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8787"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25076"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","On the formaldehyde release of wood particles"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","letter_note"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","119"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","120"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Baer, Gert"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Dix, Brigitte"],["dc.date.accessioned","2018-11-07T08:33:01Z"],["dc.date.available","2018-11-07T08:33:01Z"],["dc.date.issued","2009"],["dc.description.abstract","Subject Chips from pine wood were subjected to thermomechanical pulping (TMP) at 140 and 180 degrees C for 5 minutes, whereas the cooked chips were defibrated using a single disk pressurized refiner at the same temperatures (140 and 180 degrees C). The fibres were tested for some of their morphological properties including fibre length, fibre width, cell-wall thickness. Moreover, the fine fibre fraction (zero fibres) and the content of splinters were also estimated. The results reveal, that increasing the temperature during thermomechanical pulping decreases the fibre length, the cell width and the fibre wall thickness. It also increases the amount of fine fibres and increases the curl factor."],["dc.identifier.doi","10.1007/s00107-008-0278-9"],["dc.identifier.isi","000267042700019"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3467"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17471"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Effect of pulping temperature on the morphological properties of TMP made from pine wood"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","125"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","128"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Hameed, Mahmood"],["dc.contributor.author","Behn, Claus"],["dc.date.accessioned","2018-11-07T08:30:16Z"],["dc.date.available","2018-11-07T08:30:16Z"],["dc.date.issued","2009"],["dc.description.abstract","The release of volatile organic acids from UF-bonded particleboards made from Scots pine was assessed after production as well as after aging for 13 years. The results reveal that aging significantly decreased the release of formic acid and substantially increased the emanation of acetic acid. The change in the release of volatile acids by aging seems to be highly independent of the hardener type used (ammonium chloride, ammonium nitrate) as well as of the amount of added hardener."],["dc.identifier.doi","10.1007/s00107-008-0287-8"],["dc.identifier.isi","000267042900001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3469"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16851"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Influence of aging of UF-bonded particleboards on the release of volatile organic acids"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","113"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","115"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Baer, Gert"],["dc.date.accessioned","2018-11-07T08:33:01Z"],["dc.date.available","2018-11-07T08:33:01Z"],["dc.date.issued","2009"],["dc.description.abstract","Subject Thermo-mechanical (TMP) and chemo-thermo-mechanical pulps (CTMP) were prepared from pine wood and from UF-bonded MDF made from pine wood. For preparing TMP pine chips as well as UF-bonded MDF were digested under pressure at 170 degrees C. Thereafter, the digested chips and MDF were defibrated at 170 degrees C using a single disc refiner. CTMP was prepared from pine wood with 0.25% NaOH (based on dry wood) under the conditions set forth above. CTMP was also made from MDF under two conditions using 0.15% sodium hydroxide (% based on dry MDF) and a mixture of sodium sulphite (1%) and sodium hydroxide (0.25%). The pulps show distinct differences in their properties: TMP from UF-bonded MDF shows lower extractive content in cold and hot water, lower pH-value and higher buffering capacity towards alkali of the cold water extractives than the CTMP counterpart. Moreover, CTMP prepared by using sodium hydroxide alone as a pulping agent increases the content of formate and acetate ions in the cold water extractives. The use of a mixture of sodium sulfite and sodium hydroxide as a pulping agent decreases, however, significantly the content of formate and acetate ions in the cold water extractives. This may be due to the buffering action of sodium sulfite. In general, CTMP decreases the formaldehyde release of the fibres, as measured by the flask method. In presence of sodium sulfite as a pulping agent for recycled MDF, the formaldehyde release is slashed to almost 30% of its original value. The formaldehyde release of CTMP from UF-bonded boards seems to be in the same range as that of TMP from virgin wood."],["dc.identifier.doi","10.1007/s00107-008-0269-x"],["dc.identifier.isi","000267042700017"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3464"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17470"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Chemical properties of TMP and CTMP prepared from pine wood and UF-bonded medium density fibreboards (MDF)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","367"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","368"],["dc.bibliographiccitation.volume","68"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Dix, Brigitte"],["dc.date.accessioned","2018-11-07T08:40:46Z"],["dc.date.available","2018-11-07T08:40:46Z"],["dc.date.issued","2010"],["dc.description.abstract","Volatile acids (formic and acetic acid) from the surface and core layers of medium density fibre-boards (MDF) made from chemo-thermo-mechanical pulps (CTMP) were measured following the flask method technique. The results indicate explicitly that the emission of acids from the core layer is much higher than from the surface layer. The results are indicative of the influx of the steam distillable volatile acids from the surface layers to the core layer during pressing operation."],["dc.identifier.doi","10.1007/s00107-010-0451-9"],["dc.identifier.isi","000281072200016"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4966"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19309"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","On the release of formic and acetic acid from surface and core layers of medium density fibreboards (MDF) made from CTMP"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","389"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","HOLZ ALS ROH-UND WERKSTOFF"],["dc.bibliographiccitation.lastpage","390"],["dc.bibliographiccitation.volume","66"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Baer, Gert"],["dc.date.accessioned","2018-11-07T11:10:34Z"],["dc.date.available","2018-11-07T11:10:34Z"],["dc.date.issued","2008"],["dc.description.abstract","Subject TMP (thermo-mechanical pulps) and CTMP (chemo-thermo-mechanical pulps) were made from pine wood and recycling MDF, which has been prepared from pine wood too. The fibres were tested for their wettability using the method developed by Roffael et al. (2002). The results reveal that TMP are much less wettable in comparison to CTMP from the same wood. Moreover, fibres made from UF-bonded MDF by the TMP- and CTMP-process are of much higher wettability compared to TMP and CTMP prepared directly from wood. No significant difference in the wettability between TMP and CTMP from UF-bonded MDF was detected. This behaviour has been attributed to the fact that the UF-resin in MDF degrades during thermohydrolytic pulping leading to the formation of ammonia and free urea. Therefore, pulping of UF-bonded boards takes place under chemo-thermo-mechanical conditions (CTMP)."],["dc.identifier.doi","10.1007/s00107-008-0256-2"],["dc.identifier.isi","000259370200012"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3463"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53233"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","On the wettability of fibres made by the TMP- and CTMP-process from pine wood and recycling medium density fibreboards (MDF)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","361"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","362"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Behn, Claus"],["dc.contributor.author","Baer, Gert"],["dc.date.accessioned","2018-11-07T08:27:10Z"],["dc.date.available","2018-11-07T08:27:10Z"],["dc.date.issued","2009"],["dc.description.abstract","Thermo-mechanical (TMP) and chemo-thermo-mechanical pulping (CTMP) of UF-bonded MDF induce considerable degradation of the UF-resin in the board and lead to a conspicuous increase in the content of water extractives of the fibres. Moreover, the water extractives of the fibres have a higher pH-value and a lower buffering capacity as well as higher acetate and formate ions content than the extractives of the original board. However, the lignin content seems rather to increase than to decrease. This is possibly due to reaction between lignin and formaldehyde from the resin."],["dc.identifier.doi","10.1007/s00107-008-0280-2"],["dc.identifier.isi","000268310100016"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3468"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16161"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Degradation of UF-resins by thermo-mechanical and chemo-thermo-mechanical pulping of medium density fibreboards"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]