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Trischler, J., Sandberg, D. & Dorn, M. (2018). Effect of temperature during vital gluten adhesive preparation and application on shear-bond strength. Journal of Adhesion Science and Technology, 32(4), 448-455
Open this publication in new window or tab >>Effect of temperature during vital gluten adhesive preparation and application on shear-bond strength
2018 (English)In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 32, no 4, p. 448-455Article in journal (Refereed) Published
Abstract [en]

If protein-based adhesives are to become a competitive bio-based alternative to synthetic adhesives, the preparation and application methods have to be considerable improved to reduce process time and thereby improve the economy of the adhesive system. The purpose of this study was to investigate the impact of the temperature during preparation and application on the shear-bond strength of an adhesive based on vital gluten for use in wood applications. Vital gluten was used in its natural form and mixed with water of different temperatures (preparation temperature 0 °C or 20 °C), and applied on beech veneer at different temperature (application temperature –10, 20, 60 and 100 °C). Tensile shear-bond strength samples were prepared and tested according to EN 205. The results showed that an increase in veneer temperature during application of the adhesive led to a decrease in the shear-bond strength, but that the preparation temperature of the adhesive had no influence on the strength.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
Keywords
application temperature; bond line; preparation temperature; protein adhesive
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-67324 (URN)10.1080/01694243.2017.1362807 (DOI)000419353700009 ()2-s2.0-85027024483 (Scopus ID)
Available from: 2017-08-20 Created: 2017-08-28 Last updated: 2019-08-29Bibliographically approved
Trischler, J., Sandberg, D. & Dorn, M. (2018). Vital gluten for particleboard production: effect of wood-particle moisture on board properties. Forest products journal, 68(2), 127-131
Open this publication in new window or tab >>Vital gluten for particleboard production: effect of wood-particle moisture on board properties
2018 (English)In: Forest products journal, ISSN 0015-7473, Vol. 68, no 2, p. 127-131Article in journal (Refereed) Published
Abstract [en]

The growing environmental awareness is leading to an increased interest in the use of bio-based adhesives and proteins such as vital gluten. The purpose of this study was to investigate the influence of the wood-particle moisture content, water application and press time on the internal bond strength, thickness expansion and thickness swelling of particleboards glued with vital gluten. Green and dried wood particles with similar moisture contents were achieved through drying or water addition and were blended with vital gluten powder and pressed for 1 to 3 minutes. The results show that not only the pressing time and moisture content, but also the way of achieving the moisture content has a strong impact on the performance of the boards. At comparable moisture content, never-dried (green) particles with high moisture content in combination with a dry adhesive application produced boards which performed better than boards made of dry particles with water addition to simulate liquid adhesive application.

Place, publisher, year, edition, pages
Forest Products Society, 2018
Keywords
bio-based adhesive, internal bond strength, particle configuration, thickness swelling.
National Category
Wood Science Composite Science and Engineering
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-69428 (URN)10.13073/FPJ-D-17-00036 (DOI)000461045800005 ()2-s2.0-85064054911 (Scopus ID)
Available from: 2017-12-21 Created: 2017-12-21 Last updated: 2019-08-29Bibliographically approved
Blomqvist, L., Berg, S. & Sandberg, D. (2015). Chipless Machining: Challenges in Manufacture of Laminated Veneer Products. In: Roger Hernández and Claudia B. Cáceres (Ed.), Proceedings of the 22nd International Wood Machining Seminar, IWMS 22: Volume 1 - Oral Presentations. Paper presented at 22nd International Wood Machining Seminar, June 14-17, 2015 Quebec City, Canada (pp. 155-164). Quebec City, Canada: Université Laval
Open this publication in new window or tab >>Chipless Machining: Challenges in Manufacture of Laminated Veneer Products
2015 (English)In: Proceedings of the 22nd International Wood Machining Seminar, IWMS 22: Volume 1 - Oral Presentations / [ed] Roger Hernández and Claudia B. Cáceres, Quebec City, Canada: Université Laval , 2015, p. 155-164Conference paper, Published paper (Refereed)
Abstract [en]

A laminated veneer product (LVP) consists of veneers bonded together with adhesive under pressure into a predetermined shape and, in general, under increased temperature to shorten the curing time of the adhesive. The process is commonly used in furniture design to manufacture complex forms such as thin shells. In the industrial production of LVP and when the ready-for-use components are exposed to climate variations, rejection due to distortion of the laminates is a major problem. The shape stability depends on a variety of material and process parameters, and this study has focused on the influence of fibre deviation in a single veneer. Recent research on the shape stability of LVP and how distortion is influenced by various material and production parameters is presented. A finite-element model for LVP is introduced and the use of this model is exemplified by predicting the shape of a LVP with fibre distortion in a single veneer. The results show that it is possible to improve the shape stability of LVP if knowledge of various material and process parameters is implemented in the manufacturing process, and that a simulation based on a model of the wood material can be helpful in estimating the risk of an undesired deformation of the product.

Place, publisher, year, edition, pages
Quebec City, Canada: Université Laval, 2015
Keywords
finite element modelling, shape stability
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-44800 (URN)978-0-9947964-0-0 (ISBN)
Conference
22nd International Wood Machining Seminar, June 14-17, 2015 Quebec City, Canada
Available from: 2015-06-18 Created: 2015-06-18 Last updated: 2019-02-27Bibliographically approved
Blomqvist, L., Sterley, M., Sandberg, D. & Johansson, J. (2015). The effect of veneer modification on the bond-line strength in laminated veneer products. Paper presented at The International Conference Wood Science and Engineering in the Third Millennium (ICWSE 2015), Brasov, Romania, Nov. 5-7. Pro Ligno, 11(4), 43-49
Open this publication in new window or tab >>The effect of veneer modification on the bond-line strength in laminated veneer products
2015 (English)In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 11, no 4, p. 43-49Article in journal (Refereed) Published
Abstract [en]

A major problem in the manufacture of three-dimensional laminated veneer products (LVP) isdamage due to stretching and/or buckling of the veneer. To reduce or eliminate this problem, veneerdensification or adding a strengthening layer to the veneer can be an alternative. To study how veneermodification influences the veneer-to-adhesive bond strength, three methods of modification werestudied in relation to an unmodified reference veneer: (1) densified veneer, (2) veneer pre-bonded withpaper and hot melt adhesive (HMA), (3) veneer pre-bonded with non-woven polypropylene (NW)fabric glued to the veneer (a) with a urea formaldehyde (UF) adhesive, (b) with a mixture of UF andpolyvinyl acetate (PVAc) adhesive, and (c) with a PVAc adhesive. Densification, pre-bonding withpaper, and NW with UF/PVAc adhesive mixture resulted in no or only a slight decrease in strength ofthe bond-line compared to the reference. NW glued with UF or PVAc adhesive showed a considerablereduction in the strength of the bond-line. The climatic cycling had no significant influence on the bondstrength.

Place, publisher, year, edition, pages
Brasov, Romania: Transilvania University, 2015
Keywords
densification; HMA; pre-bonding, PVAc; strengthening; THM processing; UF; wood
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-47309 (URN)
Conference
The International Conference Wood Science and Engineering in the Third Millennium (ICWSE 2015), Brasov, Romania, Nov. 5-7
Available from: 2015-11-16 Created: 2015-11-16 Last updated: 2019-05-20Bibliographically approved
Nilsson, J., Johansson, J. & Sandberg, D. (2014). Densified and thermally modified wood as outer layers in light-weight panels for furniture and joinery. In: Final Cost Action FP0904 Conference : “Recent Advances in the Field of TH and THM Wood Treatment”: May 19-21, 2014, Skellefteå, Sweden : book of abstracts. Paper presented at Fianl Cost Action FP0904 Conference "Recent Advances in the Field Of TH and THM Wood Treatment" May 19-21, 2014, Skellefteå, Sweden (pp. 79-80). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Densified and thermally modified wood as outer layers in light-weight panels for furniture and joinery
2014 (English)In: Final Cost Action FP0904 Conference : “Recent Advances in the Field of TH and THM Wood Treatment”: May 19-21, 2014, Skellefteå, Sweden : book of abstracts, Luleå: Luleå tekniska universitet, 2014, p. 79-80Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-34358 (URN)9789174399370 (ISBN)9789174399387 (ISBN)
Conference
Fianl Cost Action FP0904 Conference "Recent Advances in the Field Of TH and THM Wood Treatment" May 19-21, 2014, Skellefteå, Sweden
Available from: 2014-05-26 Created: 2014-05-26 Last updated: 2019-05-20Bibliographically approved
Nilsson, J., Johansson, J. & Sandberg, D. (2014). Densified and thermally modified wood in light-weight panels. In: Presented at the 2014 Forest Products Society International Convention Program, Quebec City, Canada, August 10-13, 2014: . Paper presented at 2014 Forest Products Society International Convention Program, Quebec City, Canada, August 10-13, 2014.
Open this publication in new window or tab >>Densified and thermally modified wood in light-weight panels
2014 (English)In: Presented at the 2014 Forest Products Society International Convention Program, Quebec City, Canada, August 10-13, 2014, 2014Conference paper, Oral presentation with published abstract (Refereed)
National Category
Wood Science
Identifiers
urn:nbn:se:lnu:diva-34584 (URN)
Conference
2014 Forest Products Society International Convention Program, Quebec City, Canada, August 10-13, 2014
Note

Ej belagd 20141022

Available from: 2014-06-03 Created: 2014-06-03 Last updated: 2019-05-20Bibliographically approved
Blomqvist, L., Sandberg, D. & Johansson, J. (2014). Influence of veneer orientation on shape stability of plane laminated veneer products. Wood Material Science & Engineering, 9(4), 224-232
Open this publication in new window or tab >>Influence of veneer orientation on shape stability of plane laminated veneer products
2014 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 9, no 4, p. 224-232Article in journal (Refereed) Published
Abstract [en]

One of the most important quality aspects of a laminated veneer product is its shape stability under changing relative humidity (RH). This study aimed to establish an understanding of how the orientation of individual veneers in the laminate, i.e., orientation according to fibre orientation and orientation of the loose (the side with ‘lathe checks’) or tight side of the veneer, affects the shape stability. Three-ply laminates from peeled veneers of beech (Fagus sylvatica L.) were studied. The four types of laminate were the following: loose sides of all veneers in the same direction (cross and parallel centre ply) and loose sides of the outer veneers facing inward (cross and parallel centre ply). Four replicates of each type yielded 16 samples. The samples were exposed to RH cycling at 20% and 85% RH at 20°C, and the shapes of the samples were determined. The shape stability was influenced by the veneer orientation. Laminations with the middle veneer perpendicular to the top and bottom veneer (cross-laminated) showed the best shape stability, especially when the loose sides of the veneers were oriented the same direction. In parallel-laminated veneers, the laminates with opposite directions of the loose sides in the two outermost veneers showed the best shape stability. The major explanation of the behaviour of the laminates is that the loose side expanded more than the tight side from the dry to the humid climate, which was shown by optical 3D deformation analysis (ARAMISTM). After RH cycling, the laminates with cross plies showed visible surface checks only when the tight side was facing outwards.

Keywords
adhesive, distortion, lamination, plywood, thermo-hydro-mechanical processing, THM, wood
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-34541 (URN)10.1080/17480272.2014.919022 (DOI)2-s2.0-84911408156 (Scopus ID)
Available from: 2014-06-02 Created: 2014-06-02 Last updated: 2019-05-20Bibliographically approved
Blomqvist, L., Johansson, J. & Sandberg, D. (2014). Modification of surface veneer to reduce damage in laminated veneer products during manufacturing. In: Dick Sandberg and Mojgan Vaziri (Ed.), Final Cost Action FP0904, Recent Advances in the Field of TH and THM Wood Treatment, May 19-21, Skellefteå, Sweden: Book of abstracts. Paper presented at Final Cost Action FP0904, Recent Advances in the Field of TH and THM Wood Treatment, May 19-21, Skellefteå, Sweden (pp. 50-51). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Modification of surface veneer to reduce damage in laminated veneer products during manufacturing
2014 (English)In: Final Cost Action FP0904, Recent Advances in the Field of TH and THM Wood Treatment, May 19-21, Skellefteå, Sweden: Book of abstracts / [ed] Dick Sandberg and Mojgan Vaziri, Luleå: Luleå tekniska universitet, 2014, p. 50-51Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014
Keywords
densification, open system, THM processing, wood
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-34292 (URN)978-91-7439-937-0 (ISBN)
Conference
Final Cost Action FP0904, Recent Advances in the Field of TH and THM Wood Treatment, May 19-21, Skellefteå, Sweden
Available from: 2014-05-23 Created: 2014-05-23 Last updated: 2019-05-20Bibliographically approved
Blomqvist, L., Johansson, J. & Sandberg, D. (2014). Moisture-induced distortion of laminated veneer products. In: Forest Products Society (FPS)  68th International Convention: . Paper presented at Forest Products Society (FPS) 68th International Convention, August 10-13, 2014 in Québec.
Open this publication in new window or tab >>Moisture-induced distortion of laminated veneer products
2014 (English)In: Forest Products Society (FPS)  68th International Convention, 2014Conference paper, Poster (with or without abstract) (Refereed)
Keywords
thermo-hydro-mechanical processing, shape stability
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-34549 (URN)
Conference
Forest Products Society (FPS) 68th International Convention, August 10-13, 2014 in Québec
Note

Ej belagd, 20141111

Available from: 2014-06-02 Created: 2014-06-02 Last updated: 2019-05-20Bibliographically approved
Blomqvist, L., Sterley, M., Sandberg, D. & Johansson, J. (2014). The influence of veneer modification on adhesive bond strength. In: Peter Wilson (Ed.), Proceedings of the 10th meeting of the Northern European network for wood science and engineering (WSE): . Paper presented at Northern European network for wood science and engineering WSE) (pp. 150-155). Edinburg, Scotland
Open this publication in new window or tab >>The influence of veneer modification on adhesive bond strength
2014 (English)In: Proceedings of the 10th meeting of the Northern European network for wood science and engineering (WSE) / [ed] Peter Wilson, Edinburg, Scotland, 2014, p. 150-155Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Edinburg, Scotland: , 2014
Keywords
densification, pre-bonding, open system, THM processing, veneer, wood
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-37708 (URN)
Conference
Northern European network for wood science and engineering WSE)
Available from: 2014-10-16 Created: 2014-10-16 Last updated: 2019-05-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4526-9391

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