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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    We will mail you new results for this query: wurpublikatie/titelbeschrijving/classificatie/trefwoord/cab/engels==paper
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Tomatenvezel verrijkt papier
Keijsers, E.R.P. ; Dantuma, Anouk - \ 2018
Wageningen : Wageningen Food & Biobased Research
biobased economy - fibres - biobased materials - paper - tomatoes - biomass
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.
Energy reduction by control of recycled fibre selection and processing
Dekker, Jocco - \ 2006
paper - recycling - fibres - selection - drying - biobased economy - energy saving - production processes - refining
Enzyme technology for improved drainability of recycled paper, PIRA 4 March 2005
Lips, Steef - \ 2005
paper - recycling - enzymes - dewatering - biobased economy
Fibre raw material technology for sustainable paper and board production
Westenbroek, A.P.H. - \ 2005
fibres - paper - paperboard - raw materials - recycling - quality - techniques - research - biobased economy
Reduced energy consumption in/by fibre processing
Dekker, Jocco - \ 2005
paper - fibres - selection - drying - biobased economy - energy saving - refining - production processes
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
How many fibres see the refiner? Amount of changed fibres measured by RBA
Dekker, Jocco - \ 2005
fibres - fibre quality - paper - refining - biobased economy - measurement techniques - process engineering - papermaking
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.
Improved level and control of stiffness
Sinke, R.J. - \ 2004
paper - sizing - quality - paperboard - applications - properties - biobased economy - production processes
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.
Aim and technologies for fibre upgrading
Westenbroek, A.P.H. - \ 2004
paper - pulp and paper industry - management - recycling - fibres - quality - upgrading - biobased economy
MiTa : a flashlight in your black-box
Keijsers, Edwin - \ 2004
paper - production controls - quality - biobased economy - papermaking - production processes
Improved level and control of stiffness
Sinke, R.J. - \ 2004
paper - pulp and paper industry - paperboard - sizing - quality - cooperation - compressive strength - tensile strength - bending strength - applications - biobased economy - supply chain management
How to deal with the effects of recycling?
Sinke, R.J. - \ 2004
paper - recycling - pulps - fibres - properties - quality - ash - washing - analytical methods - biobased economy
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.

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