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Open AccessArticle

Analysis of Economic Feasibility of Ash and Maple Lamella Production for Glued Laminated Timber

1
Dept. Wood Biology and Wood Products, Faculty of Forest Sciences and Forest Ecology, Georg-August-University of Göttingen, 37077 Lower Saxony, Germany
2
Holzforschung München, Technical University of Munich, 80797 Bavaria, Germany
3
Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Forests 2019, 10(7), 529; https://doi.org/10.3390/f10070529
Received: 28 May 2019 / Revised: 21 June 2019 / Accepted: 24 June 2019 / Published: 26 June 2019
(This article belongs to the Special Issue Wood Properties and Processing)
Background and Objectives: In the near future, in Europe a raised availability of hardwoods is expected. One possible sales market is the building sector, where medium dense European hardwoods could be used as load bearing elements. For the hardwood species beech, oak, and sweet chestnut technical building approvals already allow the production of hardwood glulam. For the species maple and ash this is not possible yet. This paper aims to evaluate the economic feasibility of glulam production from low dimension ash and maple timber from thinnings. Therefore, round wood qualities and the resulting lumber qualities are assessed and final as well as intermediate yields are calculated. Materials and Methods: 81 maple logs and 79 ash logs cut from trees from thinning operations in mixed (beech) forest stands were visually graded, cant sawn, and turned into strength-graded glulam lamellas. The volume yield of each production step was calculated. Results: The highest volume yield losses occur during milling of round wood (around 50%) and “presorting and planning” the dried lumber (56%–60%). Strength grading is another key process in the production process. When grading according to DIN 4074-5 (2008), another 40%–50% volume loss is reported, while combined visual and machine grading only produces 7%–15% rejects. Conclusions: Yield raise potentials were identified especially in the production steps milling, presorting and planning and strength grading. View Full-Text
Keywords: volume yield; European hardwoods; low quality round wood; strength grading; glulam volume yield; European hardwoods; low quality round wood; strength grading; glulam
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Schlotzhauer, P.; Kovryga, A.; Emmerich, L.; Bollmus, S.; Van de Kuilen, J.-W.; Militz, H. Analysis of Economic Feasibility of Ash and Maple Lamella Production for Glued Laminated Timber. Forests 2019, 10, 529.

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