Roffael, Edmone

[["dc.bibliographiccitation.firstpage","189"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","HOLZ ALS ROH-UND WERKSTOFF"],["dc.bibliographiccitation.lastpage","191"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Hennecke, U."],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Schneider, T."],["dc.contributor.author","Dix, Brigitte"],["dc.date.accessioned","2018-11-07T09:45:07Z"],["dc.date.available","2018-11-07T09:45:07Z"],["dc.date.issued","2006"],["dc.description.abstract","Wood and wood-based panels emanate formic and acetic acid. The amount of acetic acid release is high in comparison to its concentration in cold water extracts of wood-based panels containing both formic and acetic acids. This is most probably due to the fact that formic acid is a stronger acid (pK(a) 3.77) than acetic acid (pK(a) 4.76). Insofar the dissociation of acetic acid is suppressed by the presence of formic acid and the undissociated acetic acid emanates in higher amounts than formic acid in the vapour phase."],["dc.identifier.doi","10.1007/s00107-005-0030-7"],["dc.identifier.isi","000238678100005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34546"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.title","To the release of volatile acids from medium density fibreboards (MDF)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["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","675"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","676"],["dc.bibliographiccitation.volume","69"],["dc.contributor.author","Roffael, Edmone"],["dc.date.accessioned","2018-11-07T08:50:31Z"],["dc.date.available","2018-11-07T08:50:31Z"],["dc.date.issued","2011"],["dc.description.abstract","Fumigation of two cross-linked UF-resins of molar ratio U:F 1:2.1 and 1:1.4 with ammonia reduces their formaldehyde release. The reduction seems to be more excessive in case of resin with molar ratio U:F 1:2.1. Ammonia fumigation also increases the nitrogen content of the hardened resins depending on their molar ratio U:F. Resin of the molar ratio U:F 1:2.1 is more receptive to ammonia than that of U:F 1:1.4. Moreover, the pH-value of aqueous extractives of the resins increases due to the ammonia treatment depending on the molar ratio U:F of the resin. Resins with high formaldehyde content are more responsive to ammonia fumigation."],["dc.identifier.doi","10.1007/s00107-011-0564-9"],["dc.identifier.isi","000295787600023"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7511"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21711"],["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 responsiveness of hardened UF-resins of different molar ratio towards ammonia fumigation"],["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","151"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","HOLZ ALS ROH-UND WERKSTOFF"],["dc.bibliographiccitation.lastpage","152"],["dc.bibliographiccitation.volume","62"],["dc.contributor.author","Hennecke, U."],["dc.contributor.author","Roffael, Edmone"],["dc.date.accessioned","2018-11-07T10:49:55Z"],["dc.date.available","2018-11-07T10:49:55Z"],["dc.date.issued","2004"],["dc.identifier.doi","10.1007/s00107-003-0451-0"],["dc.identifier.isi","000221222900013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48539"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.title","Formaldehyde release by middle-density fiberboard under hydrolytic conditions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","letter_note"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","HOLZ ALS ROH-UND WERKSTOFF"],["dc.bibliographiccitation.volume","58"],["dc.contributor.author","Hameed, M."],["dc.contributor.author","Roffael, Edmone"],["dc.date.accessioned","2018-11-07T10:39:21Z"],["dc.date.available","2018-11-07T10:39:21Z"],["dc.date.issued","2000"],["dc.format.extent","306"],["dc.identifier.doi","10.1007/s001070050433"],["dc.identifier.isi","000166051100003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46025"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.title","Preliminary research on the influence of anatomical wood section on gluability of sapwood and heartwood from pine (Pinus sylvestris L.)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","73"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","HOLZ ALS ROH-UND WERKSTOFF"],["dc.bibliographiccitation.lastpage","74"],["dc.bibliographiccitation.volume","61"],["dc.contributor.author","Roffael, Edmone"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Schneider, T."],["dc.contributor.author","Kraft, R."],["dc.date.accessioned","2018-11-07T10:41:18Z"],["dc.date.available","2018-11-07T10:41:18Z"],["dc.date.issued","2003"],["dc.description.abstract","Extractable urea was determined in water extractives of medium density fiberboards (MDF), prepared using the blowline- and blender-technique. The results reveal: higher amounts of urea are extractable from boards resinated in the blowline than in the blender. Therefore, it seems that less cross-linking of the resin takes place in the blowline than in the blender."],["dc.identifier.doi","10.1007/s00107-002-0355-4"],["dc.identifier.isi","000181662400011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46504"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.title","Extractable urea in MDF prepared using the blowfine- and blender-technique"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["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","1025"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","1026"],["dc.bibliographiccitation.volume","75"],["dc.contributor.author","Roffael, Edmone"],["dc.date.accessioned","2020-12-10T14:08:18Z"],["dc.date.available","2020-12-10T14:08:18Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s00107-017-1213-8"],["dc.identifier.eissn","1436-736X"],["dc.identifier.issn","0018-3768"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70420"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Release of acetic acid and formaldehyde from particleboards bonded with phenolic resins"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","299"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","HOLZ ALS ROH-UND WERKSTOFF"],["dc.bibliographiccitation.lastpage","300"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Dix, Brigitte"],["dc.contributor.author","Schafer, M."],["dc.contributor.author","Roffael, Edmone"],["dc.date.accessioned","2018-11-07T08:48:43Z"],["dc.date.available","2018-11-07T08:48:43Z"],["dc.date.issued","2001"],["dc.description.abstract","Subject Chemo-thermo-mechanical pulps (CTMP) were made from waste particle- and fibreboards. Medium density fiberboards (MDF) were made from industrial refiner fibers in combination with the CTMP using urea-formaldehyde resin as a binder. The physical properties and the formaldehyde content of the MDF were determined. The results reveal that MDF made from CTMP of waste particle- and fibreboards meet the standards according to EN 622-5, type MDF. The bending strength and internal bond of MDF made from industrial TMP is higher compared with MDF from chemo-thermo-mechanical pulps from waste panels. However, the thickness swelling of MDF made from pulps derived from waste panels is clearly lower compared with that of MDF made from industrial TMP. Furthermore, MDF made from pulps derived from waste panels show a lower formaldehyde content than MDF from virgin fibers. It seems that residues of chemicals from the pulping process (CTMP) act as a formaldehyde scavanger."],["dc.identifier.doi","10.1007/s001070100211"],["dc.identifier.isi","000170529900014"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21286"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0018-3768"],["dc.title","Use of fiber material from chemothermomechanically processed waste particleboard and fiberboard"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]