Bidragsanalys av dimensioner och postningar
An old and well known problem in sawmilling is to determine which dimensions /products those are most profitable to produce. Existing optimization models maximize the value of the log. In other words, based upon the market prices of the dimensions the models calculate the best way to split the log....
| Autor principal: | |
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| Formato: | Otro |
| Lenguaje: | sueco sueco |
| Publicado: |
2007
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| Materias: | |
| Acceso en línea: | https://stud.epsilon.slu.se/11992/ |
| _version_ | 1855571979235491840 |
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| author | Rosenquist, Björn |
| author_browse | Rosenquist, Björn |
| author_facet | Rosenquist, Björn |
| author_sort | Rosenquist, Björn |
| collection | Epsilon Archive for Student Projects |
| description | An old and well known problem in sawmilling is to determine which dimensions /products those are most profitable to produce. Existing optimization models maximize the value of the log. In other words, based upon the market prices of the dimensions the models calculate the best way to split the log. Yet there is a great uncertainty if the most well paid dimensions really are the most profitable to produce. The costs of the process from lumber to sawn products are hard to determine and are therefore often left out from the optimization process.
In this study the economic contribution of different dimensions/products are analysed. These occur through taking the direct-costs into account and then add the capacity cost that the dimensions give rise to when occupying the planner. In this way a ranking of the dimensions is done, a ranking that also takes the section that limits the production of the sawmill, the planner, into account. The results show that it is in fact the dimensions with high market prices that are the most profitable to produce. The production costs seem to differ quite little while the market prices seem to differ all the more.
In the next step all the costs and revenues are calculated back to the saw patterns. Although it is in fact the patterns that state which dimensions that will be produced. The results indicate that the saw patterns in use are not always the most profitable alternative. Instead it is rather the saw patterns with the best volume yield that are used.
Based upon these results it seems to be quite a lot of opportunities to improve the production and the profitability. For example, by direct the production towards certain well paid dimensions and also if possible use the saw patterns with the highest profita¬bility. |
| format | Otro |
| id | RepoSLU11992 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish swe |
| publishDate | 2007 |
| publishDateSort | 2007 |
| record_format | eprints |
| spelling | RepoSLU119922017-11-14T11:49:23Z https://stud.epsilon.slu.se/11992/ Bidragsanalys av dimensioner och postningar Rosenquist, Björn Forestry production An old and well known problem in sawmilling is to determine which dimensions /products those are most profitable to produce. Existing optimization models maximize the value of the log. In other words, based upon the market prices of the dimensions the models calculate the best way to split the log. Yet there is a great uncertainty if the most well paid dimensions really are the most profitable to produce. The costs of the process from lumber to sawn products are hard to determine and are therefore often left out from the optimization process. In this study the economic contribution of different dimensions/products are analysed. These occur through taking the direct-costs into account and then add the capacity cost that the dimensions give rise to when occupying the planner. In this way a ranking of the dimensions is done, a ranking that also takes the section that limits the production of the sawmill, the planner, into account. The results show that it is in fact the dimensions with high market prices that are the most profitable to produce. The production costs seem to differ quite little while the market prices seem to differ all the more. In the next step all the costs and revenues are calculated back to the saw patterns. Although it is in fact the patterns that state which dimensions that will be produced. The results indicate that the saw patterns in use are not always the most profitable alternative. Instead it is rather the saw patterns with the best volume yield that are used. Based upon these results it seems to be quite a lot of opportunities to improve the production and the profitability. For example, by direct the production towards certain well paid dimensions and also if possible use the saw patterns with the highest profita¬bility. Att bestämma vilka dimensioner/produkter som är mest lönsamma att producera i ett sågverk är ett gammalt problem. Det finns optimeringsmodeller för att såga mot bästa värdeutbyte, dvs. mot de dimensioner som ger bäst betalt. Dock råder det en stor osäkerhet ifall dessa produkter verkligen är de som är mest lönsamma. Kostnaderna i processen från stock till färdig vara är svåra att bestämma och utelämnas därför i optimeringsprocessen. I denna studie undersöks vilka täckningsbidrag som olika dimensioner/produkter ger. Detta sker genom att beakta de rörliga kostnaderna för produktionen och marknadspriserna för de olika dimensionerna. Utöver de rörliga kostnaderna adderas även kapacitetskostnaden, dvs. kostnaderna för maskinkapaciteten och personalstyrkan, för den tid som dimensionerna tar ianspråk i hyveln. På detta sätt fås en rangordning av dimensionerna som även tar hänsyn till den för sågverket trånga sektionen, i detta fall hyveln. Resultaten visar på att det är de dimensioner som har de högsta marknadspriserna som är mest lönsamma att producera. Produktionskostnaderna verkar skilja sig relativt lite åt mellan de olika dimensionerna medan marknadspriserna verkar skilja sig åt desto mer. I nästa steg räknas sedan alla kostnader och intäkter tillbaka till postningarna då det är dessa som styr vilka dimensioner som de facto kommer att produceras. Resultaten indikerar att det inte alltid är de postningar som ger de bästa täckningsbidragen som används utan snarare postningar som genererar höga sågutbyten. Utifrån dessa resultat torde det således finnas en del förbättringar som borde vara möjliga att genomföra för att öka lönsamheten i produktionen. Exempelvis genom att styra produktionen mot vissa dimensioner samt använda de postningar som ger det högsta lönsamhetsutbytet. 2007-06-08 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/11992/1/rosenquist_b_171114.pdf Rosenquist, Björn, 2007. Bidragsanalys av dimensioner och postningar : en studie vid Vida Alvesta. UNSPECIFIED, Uppsala. Uppsala: (S) > Dept. of Forest Products <https://stud.epsilon.slu.se/view/divisions/OID-231.html> urn:nbn:se:slu:epsilon-s-8785 swe |
| spellingShingle | Forestry production Rosenquist, Björn Bidragsanalys av dimensioner och postningar |
| title | Bidragsanalys av dimensioner och postningar |
| title_full | Bidragsanalys av dimensioner och postningar |
| title_fullStr | Bidragsanalys av dimensioner och postningar |
| title_full_unstemmed | Bidragsanalys av dimensioner och postningar |
| title_short | Bidragsanalys av dimensioner och postningar |
| title_sort | bidragsanalys av dimensioner och postningar |
| topic | Forestry production |
| url | https://stud.epsilon.slu.se/11992/ https://stud.epsilon.slu.se/11992/ |