Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Research news : Competence Centre Paper and Board
    Yilmaz, G. - \ 2008
    papier - karton - samenwerking - onderzoek - biobased economy - paper - paperboard - cooperation - research
    Within Wageningen UR , the research programme Paper and Board co-operates with the Dutch Competence Centre Paper and Board in order to improve the development and exchange of knowledge within the Dutch Paper and Board industry.
    Research news : pulping and bleaching activities
    Keijsers, E.R.P. - \ 2008
    pulpbereiding - papier - bleking - vezels - karton - wetenschappelijk onderzoek - pulping - paper - bleaching - fibres - paperboard - scientific research
    Agrotechnology & Food Sciences Group is an organisation for fundamental and applied scientific research. The research department Fibre and Paper Technology is actively involved in pulping and bleaching research with a wide range of raw materials, including wood, non- wood and recycled fibres.
    Facilities and services : testing facilities, Paper and Board Research at Wageningen UR
    Kamp, R.G.M. op den - \ 2008
    vezels - pulp - papier - karton - testen - technieken - biobased economy - fibres - pulps - paper - paperboard - testing - techniques
    Fibres, pulp, paper and board are analysed for different purposes by standard or specially developed methods.
    Research news : Paper and Board Research
    Yilmaz, G. - \ 2008
    papier - karton - onderzoek - vezels - ruwe grondstoffen - kwaliteit - afvalhergebruik - biobased economy - energiebesparing - proceskunde - paper - paperboard - research - fibres - raw materials - quality - waste utilization - energy saving - process engineering
    Wageningen UR Paper and Board conducts fundamental and applied research to develop new sustainable processes and products in the paper and board area. Our expertise enables us to contribute towards improved process efficiency by more effective use of fibre raw materials, introduction of new chemicals, control of stock preparation and product quality and by reduction of energy and waste formation.
    Baanbrekende verpakkingsconcepten van karton
    Reuvers, M. ; Wienk, I. - \ 2005
    Pakblad 27 (2005)3. - ISSN 1389-7381 - p. 10 - 10.
    verpakkingen - recycling - duurzaamheid (sustainability) - innovaties - verpakkingsmaterialen - karton - papier - polymeren - wrappings - sustainability - innovations - packaging materials - paperboard - paper - polymers
    Binnen 35 onderzoekspartners in 13 EU-lidstaten loopt het grootste onderzoek naar duurzame verpakkingen van hernieuwbare grondstoffen (Sustainpack) ooit. Het gaat hierbij voornamelijk om verpakkingen van papier, karton en biopolymeren uit hout- en plantenvezels. Uitleg over de deelprojecten met commentaar van Ingrid Wienk van A&F, projectleider van het deelproject Communicatieve verpakkingen
    Biotechnological application of enzymes for making paper pulp from green jute/kenaf
    Snijder, M.H.B. ; Lips, S.J.J. ; Maas, R.H.W. ; Kamp, R.G.M. op den; Valk, H.C.P.M. van der; Jong, E. de - \ 2004
    Wageningen : Agrotechnology & Food Innovations (Rapport 93)
    papier - pulpbereiding - jute - kenaf - productieprocessen - biotechnologie - voorbehandeling - enzymen - biobased economy - paper - pulping - production processes - biotechnology - pretreatment - enzymes
    The objectives of the tasks of Agrotechnology & Food Innovation (formerly ATO) in the project are: to determine at laboratory level the best conditions for producing high-yield pulps from whole jute for utilisation in wood containing papers; to test the potential of using recommended enzyme recipes in both extruder and refiner processes in terms of pulp quality, chemicals and energy consumption, brightness and production cost; to evaluate the potential of a micro-biological pre-treatment with selected strains of fungi; to establish process conditions for pilot confirmatory trials.
    Optimalisatie stijfheid van papier en karton
    Sinke, R.J. - \ 2004
    Wageningen : Agrotechnology & Food Innovations
    papier - karton - kwaliteit - verbetering - stijven - meettechnieken - biobased economy - paper - paperboard - quality - improvement - sizing - measurement techniques
    Poster met informatie over het project ‘Optimalisatie Stijfheid’. In het project worden verschillende deelonderzoeken uitgevoerd, in kleinere groepen. De resultaten zijn gericht op korte-termijn implementatie bij de bedrijven.
    Witlof, aardbeien en golfkarton op de pijnbank : transportsimulatorexperimenten onder in de keten realistische omstandigheden
    Weert, K. van; Donkelaar, J. ten; Boogaard, G. van den - \ 2001
    Voedingsmiddelentechnologie 34 (2001)8. - ISSN 0042-7934 - p. 50 - 51.
    verpakkingsmaterialen - materialen - karton - papier - verse producten - fruit - groenten - vervoerskwaliteit - mechanische schade - verbetering - simulatie - packaging materials - materials - paperboard - paper - fresh products - vegetables - transporting quality - mechanical damage - improvement - simulation
    Het voorkomen van transportschade aan producten en verpakkingen door verbetering van verpakkingen en verpakkingsmaterialen
    Alkaline hemp woody core pulping : impregnation characteristics, kinetic modelling and papermaking qualities
    Groot, B. de - \ 1998
    Agricultural University. Promotor(en): K. van 't Riet; J.E.G. van Dam. - S.l. : S.n. - ISBN 9789054858898 - 97
    hennep - plantenvezels - papier - pulpbereiding - hemp - plant fibres - paper - pulping

    The aim of this thesis is to elucidate alkaline processing of hemp woody core, supporting the development and optimization of an efficient and non-polluting pulping process. This study has been a constituent of an integral programme to study fibre hemp.

    It is known that the outer part of the fibre hemp stem can be used for textile and specialty paper purposes. The inner part consists of hemp woody core, which resembles hardwood and might be processed similarly for paper pulp. Literature data and prefeasibility studies show that alkaline processes can be used to produce hemp woody core pulp for papermaking.

    Alkaline processes, based on sodium hydroxide (NaOH) are used for many wood and non-wood species. The most important process is the kraft process, but alternative NaOH based processes for pulp production have been investigated too. The currently developed alkaline process for high yield hardwood pulping may also be implemented for hemp woody core.

    Pulp mixes for papermaking can vary, depending on the available fibre sources. The technological developments and the growing market outlet for hardwood fibres increase the possibilities to use hemp woody core for papermaking.

    In chapter 2 swelling of hemp woody core chips after alkaline (peroxide) impregnation at 70 °C has been studied, as is practised in alkaline peroxide mechanical pulping (APMP) processes. Swelling of hemp woody core chips has been examined in relation to pulp yield and chemical composition of the chips after impregnation.

    In contrast to wood chips, maximum swelling is attained at 70 °C without chemical treatment, possibly as the result of relatively high porosity of hemp woody core cell walls.

    Alkaline swelling at 70 °C correlates with the xylan:lignin ratio. Swelling at ambient temperature shows some correlation with acidic group content.

    Apparent pore size distributions have been examined, using 1H NMR spin-spin relaxation. Several apparent pore size distributions can be distinguished within each sample. Elevated temperature, NaOH and peroxide addition influence the apparent pore size distribution and the total pore volume in different ways.

    Addition of peroxide results in remark-able increase of the apparent pore sizes. This emphasizes its importance, not only as bleaching chemical in the APMP process, but also promoting fibre flexibility.

    Alkaline delignification of hemp woody core is studied in chapter 3. Shavings of hemp woody core were delignified isothermally at several temperatures with 1M NaOH in a flow-through reactor. From literature data and from experimental data reported in this chapter, it appears that the initial delignification stage is completed before customary reaction temperatures are reached. Consequently, modelling of alkaline delignification kinetics can be restricted to the bulk and residual delignification stages. This can be described with two simultaneous first order reactions: L/L0 = a2 exp (-k2t) + a3 exp (-k3t), with ki = Ai exp -Eai/(RT).

    This equation has been solved integrally, calculating a2, a3, Ea2, Ea3, A2 and A3 for the best fit for the experimental data, resulting in an accurate description of the delignification reactions. This kinetic model has also been applied on literature data, supporting its validity for alkaline delignification kinetics in general.

    This model is also used in chapter 4, to describe the kinetics of alkaline delignification in more detail, and to describe the degradation of xylan and cellulose. Shavings of hemp woody core were impregnated at room temperature with various NaOH concentra-tions (0.25-2.0M) and delignified isothermally at various reaction temperatures (150-180 °C) in a flow-through reactor.

    Extraction and degradation of xylan from hemp woody core strongly depends on NaOH concentration. Consequently, to attain a certain lignin content, lower NaOH concentrations result in higher pulp yields. Extended pulping diminishes the differences in pulp yields, due to further xylan degradation.

    The kinetics of lignin, xylan and cellulose degradation are modelled as a function of reaction time, temperature and NaOH concentration. The combined models resulted in a pulp yield model for hemp woody core, suitable for process optimization purposes. Degradation kinetics of perennial wood can be modelled similarly, which was illustrated using literature data on spruce and poplar.

    In chapter 5 strength and surface properties of test sheets, produced from alkaline hemp woody core pulp were examined. The development of bulk and tear with beating are similar as found for straw pulp; maximum tear strength is attained without beating. Burst and tensile strength, scattering and opacity develop similarly as for hardwood pulps, with less mechanical energy needed. Tear strength is not affected by pulp yield or composition, whereas lower tensile and burst strength are found with decreased yield and lower xylan content.

    As the paper strength and surface properties of hemp woody core pulp are comparable with those for hardwood and straw pulps, it is conceivable that similar amounts of alkaline hemp woody core pulp can be used in pulp mixes for printing paper grades.

    The polymerization degree (DP) of hemp woody core pulps has been related to the paper strength properties, and modelled as function of pulping conditions and time.

    The influence of NaOH concentration on depolymerization and cellulose degradation is much stronger than reported in literature for other pulps. This may be related to the low density of hemp woody core, preventing diffusion effects. Finally, crystallinity has been examined and related to cellulose degradation of alkaline hemp woody core pulp.

    In chapter 6 the results and conclusions are discussed. It is emphasised that hemp woody core has a lower density than hardwood or softwood. It is suggested that this is the cause for maximal swelling without NaOH addition, the found xylan and yield losses with NaOH impregnation, and the strong dependency of cellulose degradation and depolymerisation on NaOH concentration.

    In general, it was confirmed that hemp woody core can be delignified similarly as hardwood. The modelling techniques used have been proved to be generally applicable on degradation and depolymerisation kinetics, not only for hemp woody core, but also for hardwood and softwood species. The paper characteristics are comparable both to hardwood and to straw pulp characteristics.

    Non-farm employment in rural Kenya : micro-mechanisms influencing food and nutrition of farming households
    Mwadime, R.K.N. - \ 1996
    Agricultural University. Promotor(en): J.C. Hoorweg; J.G.A.J. Hautvast. - S.l. : Mwadime - ISBN 9789054856177 - 141
    arbeidsmarkt - werkgelegenheid - huishoudelijke consumptie - huishouduitgaven - uitgaven voor consumptie - budgetten - inkomen - kindervoeding - zuigelingenvoeding - huishoudens - consumptie - papier - bordpapier - karton - financieel beheer - labour market - employment - household consumption - household expenditure - consumer expenditure - budgets - income - child nutrition - infant nutrition - households - consumption - paper - cardboard - paperboard - financial management
    The study reported here describes the links between non-farm employment and child nutritional status in rural coastal Kenya using a model adapted from an operational model commonly used in nutrition planning. Four studies were conducted in 1994 and 1995 in a community in Kwale district. Three of these studies were nonfarm employment and subsistence food production, household income and food accessibility, and maternal employment and child care and house health environment. The findings of these three studies were used in the design of the fourth study which assessed the whole model.

    Households which combined both NFE and agricultural sources of income had higher total incomes than those which depended on only one source. The relation between non-farm employment and nutritional status was weak. There was a positive relation between household income and the level of household food expenditure, which, in turn, was positively associated with long-term nutritional status of children. Higher energy intake was associated with food diversity and increased with income level. The sources of differences in food diversity within income groups were not sought. Household income and time spent in the non-farm activities per woman had no direct linear effects on the components of child care. However, income did affect housing quality, while time affected household sanitation/hygiene. Maternal employment had no effect on the components of child care and household-living conditions when controlling for the age of the youngest child, mother's education and household income. This is attributed to the fact that the mother had a lot of "spare time". Hence, this analysis suggests that non-farm employment can open an opportunity to provide for enhanced child's long-term nutritional status through the effect of total income on nutrient intake and through purchased goods that improve housing quality. Women's time in non-farm employment, although affecting house sanitation/hygiene, does not have to compromise the nutritional status of children. It is concluded that the framework used by households to allocate their resources of time and income is different from the framework used for programming and policy development. The role of non-economic factors in the difference between two frameworks is suggested as a focus for future research.

    Oogst en natte conservering van vezelhennep.
    Maeyer, E.A.A. de; Huisman, W. - \ 1995
    Landbouwmechanisatie 46 (1995)9. - ISSN 0023-7795 - p. 14 - 16.
    oogsten - bestraling - maïs - papier - plantenvezels - behoud - ruwe grondstoffen - opslag - Zea mays - harvesting - irradiation - maize - paper - plant fibres - preservation - raw materials - storage
    In een onderzoek is de gehele keten vanaf de teelt van het gewas tot en met de verwerking tot papier nagegaan
    Vezelhennep als papiergrondstof : teeltonderzoek 1990 - 1993 = Fibre hemp as a raw material for paper : agronomic research 1990 - 1993
    Werf, H.M.G. van der; Geel, W.C.A. van - \ 1994
    Lelystad : PAGV (Verslag / Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond nr. 177) - 62
    Cannabis sativa - bordpapier - hennep - industrie - papier - karton - pulp- en papierwarenindustrie - textielvezels - cardboard - hemp - industry - paper - paperboard - pulp and paper industry - textile fibres
    Afzetperspectieven voor Nederlandse hennep en henneppulp in de papiersector
    Onna, M.J.G. van; Ent, E.J. van den - \ 1994
    Den Haag : Landbouw-Economisch Instituut (LEI-DLO) (Onderzoekverslag / Landbouw-Economisch Instituut (LEI-DLO), Afdeling Landbouw 118) - ISBN 9789052422367 - 103
    Cannabis sativa - hennep - ruwe grondstoffen - papier - plantenvezels - bosbouw - pulp- en papierwarenindustrie - cellulose - cellulosevezels - handel - markten - marketing - marktconcurrentie - aanbodsevenwicht - Nederland - hemp - raw materials - paper - plant fibres - forestry - pulp and paper industry - cellulosic fibres - trade - markets - market competition - supply balance - Netherlands
    Vervroeging van bospeen door middel van folie - bedekking
    Schroen, G.J.M. ; Schoneveld, J.A. - \ 1992
    In: Jaarboek 1987-1992 : verslagen van in 1987-1992 afgesloten onderzoekprojecten op Regionale Onderzoek Centra en het PAGV Lelystad : Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond (Publikatie / Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond, Regionale Onderzoekcentra no. 38-64) - p. 240 - 244.
    penen - daucus carota - mulchen - papier - kunststoffilm - carrots - mulching - paper - plastic film
    Objecten die in deze proef zijn opgenomen zijn: a) onbedekt telen, b) bedekt telen met agryl, c) bedekt telen met geperforeerd plastic folie, d) telen met een dubbele bedekking, waarbij de onderlaag bestaat uit vliesdoek (agryl) en de bovenlaag uit geperforeerd plastic
    Vervroeging van de oogst van suikermaisAdvancement of the harvest of sweet corn
    Wijk, C.A.Ph. van; Kramer, C.F.G. ; Lighthart, J. - \ 1991
    In: Jaarboek 1987-1992 : verslagen van in 1987-1992 afgesloten onderzoekprojecten op Regionale Onderzoek Centra en het PAGV Lelystad : Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond (Publikatie / Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond, Regionale Onderzoekcentra no. 38-64) - p. 168 - 173.
    teelt - oogsttijdstip - mulchen - papier - kunststoffilm - suikermaïs - zea mays - cultivation - harvesting date - mulching - paper - plastic film - sweetcorn
    Vervroeging van de oogst probeert men te bereiken door vervroegd zaaien en/of afdekking met agryl of maisfolie
    Teeltvervroeging bij teunisbloem
    Vreeke, S. - \ 1989
    In: Jaarboek 1987-1992 : verslagen van in 1987-1992 afgesloten onderzoekprojecten op Regionale Onderzoek Centra en het PAGV Lelystad : Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond (Publikatie / Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond, Regionale Onderzoekcentra no. 38-64) - p. 100 - 102.
    mulchen - onagraceae - papier - kunststoffilm - mulching - paper - plastic film
    Vervroeging van mais door bodembedekkende folie en uitplanten
    Werf, H.M.G. van der; Hoek, H. - \ 1989
    In: Jaarboek 1987-1992 : verslagen van in 1987-1992 afgesloten onderzoekprojecten op Regionale Onderzoek Centra en het PAGV Lelystad : Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond (Publikatie / Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond, Regionale Onderzoekcentra no. 38-64) - p. 123 - 132.
    maïs - mulchen - papier - kunststoffilm - oogsttoename - oogstverliezen - opbrengsten - zea mays - maize - mulching - paper - plastic film - yield increases - yield losses - yields
    Teeltvervroeging bij mais : het effect van bodembedekkend plastic folie en het uitplanten op de opbrengst van mais = The effect of plastic mulch and planting on yield of maize
    Werf, H.G.M. van der; Hoek, H. - \ 1989
    Lelystad : P.A.G.V. (Verslag \\ Proefstation voor de Akkerbouw en de Groenteteelt in de Vollegrond 79) - 19
    maïs - mulchen - papier - kunststoffilm - heraanplanten - oogsttoename - oogstverliezen - opbrengsten - zea mays - maize - mulching - paper - plastic film - replanting - yield increases - yield losses - yields
    Milieu-effecten van papierslibtoediening op landbouwpercelen in de gemeente Apeldoorn
    Pankow, J. ; Toorn, A. van de; Hoeks, J. - \ 1987
    Wageningen : ICW (Nota / Instituut voor Cultuurtechniek en Waterhuishouding 1797) - 26
    bordpapier - gezondheid - zware metalen - industrie - papier - karton - pulp- en papierwarenindustrie - rioolwater - bodem - bodemverontreiniging - nederland - gelderland - veluwe - cardboard - health - heavy metals - industry - paper - paperboard - pulp and paper industry - sewage - soil - soil pollution - netherlands
    Landbouwplastic = Agricultural plastic
    Anonymous, - \ 1981
    Wageningen : Pudoc (Literatuurlijst / Centrum voor Landbouwpublikaties en Landbouwdocumentatie no. 4574)
    kunststoffen - rubber - mulchen - kunststoffilm - papier - landbouw - bibliografieën - synthetische materialen - plastics - mulching - plastic film - paper - agriculture - bibliographies - synthetic materials
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