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Improving drying and increasing the yield of outdoor cladding at AB Hilmer Andersson
2011 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main objective of this thesis was to increase the yield of first-class exterior cladding by improving the drying process. Secondary objectives was to investigate how the drying process at AB Hilmer Andersson works today and how it can be improved to get better drying results and thereby yields. The work has been performed at AB Hilmer Andersson, a sawmill / planing mill located in western Värmland. The end product of the yield measurement was measured on sawed rectangular spruce panel 19x148, sawn from planks with dimensions 63x150. The work began with interviews to find out what is problematic with the drying and which drying damages that is most common at AB Hilmer Andersson. The most common problems was poorly sticked packages, kilns are not charged accurate and that the conditioning equipment was not working. The most common drying damages was warping and cracking. Through theoretical studies of drying solutions to drying damages were identified, and new drying schedules were developed to compare with existing drying. The new schedules had gentler drying to achieve less tension in the wood and therefore less cracking and warping. The problem of sticking was solved by modifying the stacking of the green sorting. Some of the poor recharging of the kilns was solved by a larger compressor to make the pressure frames move more accurate. The main conclusions are as follows; It was not worth the cost of an expensive drying process in relation to the economic benefit, they should continue with progressive kiln drying on wood that is to be split. Drying is very seasonal so in the dry season in March-June, dryer operator must be extra careful and plan the drying so that no timber may be left outdoors for long. The drying operator must get instructions about the saw planning in time so he knows which end products the sawn goods will be. Stacking and packing is an important part of the drying process and must be correct for good drying results and therefore, the staff must be careful with the maintenance and report errors immediately. The focus needs to be reversed from that only getting the timber into the dryer to dry after which final product the current timber is going to be ie after the end quality to be achieved and how the timber should be treated after drying

Place, publisher, year, edition, pages
2011. , 97 p.
Keyword [en]
Technology
Keyword [sv]
Teknik, Trätorkning, Ytterbeklädnad
Identifiers
URN: urn:nbn:se:ltu:diva-58497Local ID: f1482ba4-bca1-413b-96f4-71f6fe748ce2OAI: oai:DiVA.org:ltu-58497DiVA: diva2:1031885
Subject / course
Student thesis, at least 30 credits
Educational program
Wood Engineering, master's level
Supervisors
Examiners
Note
Validerat; 20120109 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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fulltext(2128 kB)61 downloads
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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • ieee
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Language
  • de-DE
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  • en-US
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  • nn-NO
  • nn-NB
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Output format
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