Scholarly Works, Sustainable Biomaterials
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Browsing Scholarly Works, Sustainable Biomaterials by Author "Buehlmann, Urs"
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- The Effect of Kerf Thickness on Hardwood Log RecoveryThomas, R. Edward; Buehlmann, Urs (Forest Products Society, 2022-02-07)When sawing a log into lumber or other products, the saw blade removes material to separate the wood fibers between the resulting two parts, a loss of material that is commonly referred to as saw kerf. Thicker kerfs result in greater waste and less material available to produce lumber. Over the past decades, with the advancement of materials and technology, saw blade thickness has decreased. However, the reduction in material loss owing to a reduction in saw kerf may not always translate into a statistically significant increase in lumber product recovery. In this study, we explored the effect of saw kerf thickness on lumber recovery for a range of hardwood log diameters using the US Forest Service's Log Recovery Analysis Tool (LORCAT) sawmill simulation tool. Results indicate that the recovery gains realized depend upon the log diameters sawn, the lumber target thickness, and the change (reduction) in the thickness of the saw kerf.
- Estimating Component Yield for CLT ProductionBuehlmann, Urs; Thomas, R. Edward (2017)The emergence of cross-laminated timber (CLT) for building construction in North America may provide an additional and possibly more valuable product market for hardwood logs. Using the RaySaw sawing and ROMI rough mill simulators and a digital databank of laser-scanned low-grade yellow-poplar (Liriodendron tulipifera) logs, we examine the yield-recovery potential for components used in the production of CLT. Results include a sawing yield of 65% and a rough-mill yield of 78%, for a total material yield of approximately 50%. This study confirmed the usability of yellow poplar as a material for the production of CLT and allows to estimate the impact on our forest resource of increased use of yellow poplar CLT.
- Potential for Yield Improvement in Combined Rip-First and Crosscut-First Rough Mill ProcessingThomas, R. Edward; Buehlmann, Urs (2016-02)Traditionally, lumber cutting systems in rough mills have either first ripped lumber into wide strips and then crosscut the resulting strips into component lengths (rip-first), or first crosscut the lumber into component lengths, then ripped the segments to the required widths (crosscut-first). Each method has its advantages and disadvantages. Crosscut-first typically works best for the production of wider components, while rip-first favors the production of narrower and longer components. Thus, whichever type of processing method is selected for a given rough mill usually depends on the characteristics of the cutting bills the mill expects to process. There is a third option, a dual-line mill that contains both ripfirst and crosscut-first processing streams. To date, such mills have been rare for a variety of reasons, complexity and cost being among them. However, dual-line systems allow the mill to respond to varying cutting bill size demands as well as to board characteristics that favor one method (rip-first or crosscut-first) over the other. Using the Rough Mill Simulator (ROMI 4), this paper examines the yield improvement potential of dual-line processing over single-system processing (i.e., rip-first or crosscut-first processing alone) for a variety of cutting bills and lumber grade mixes.
- A Preliminary Assessment of Industry 4.0 and Digitized Manufacturing in the North American Woodworking IndustryBumgardner, Matthew; Buehlmann, Urs (Forest Products Society, 2022-03-07)Industry 4.0, a term referring to the digitization of manufacturing, enhanced automation, and data-driven production systems, promises to bring rapid change to the secondary woodworking industry. Manufacturers in this sector, many being small in size and scale, may be challenged to remain competitive without understanding how Industry 4.0 principles might affect their operations. A study conducted with subscribers to a major secondary wood industry trade journal found that few North American woodworking companies were familiar with the term "Industry 4.0." However, that did not mean they were not making decisions about, investing in, and implementing digitization-computerization (digit-comp) in their manufacturing operations. Well over half of study respondents indicated that their firms had made a significant investment in digit-comp over the past 3 years. Several respondents stated that software and technology integration was the most unexpected problem encountered, and that skilled labor was difficult to find. A variety of training types were sought by firms that had made significant Industry 4.0-related investments, especially training related to machine operation. Although a plurality of respondents from both small and large firms indicated that increased digit-comp would not change their number of employees, small firms were more likely to say more employees would be needed and large firms were more likely to perceive a decrease in employees. Perhaps the greatest challenge to successful implementation of Industry 4.0 will be the lack of a strategic plan-just 19 percent of small firms indicated having a vision of how digitization might affect their business.
- Recent Developments in US Hardwood Lumber Markets and Linkages to Housing ConstructionBuehlmann, Urs; Bumgardner, Matthew; Alderman, Delton (2017-09)The housing industry has long provided important markets for the higher-value hardwood lumber used in fixtures such as cabinets, flooring, and millwork. These markets have become even more important in the face of the decline in furniture manufacture in the USA. The importance of housing and other construction markets to the US hardwood industry is the focus of the current review. The housing crisis that began in 2007 (from a construction data perspective) has had a profound impact on the hardwood industry by reducing demand for many products and hardwood industry employment, metrics that recently have started to recover. For higher-value hardwoods, exports have become a critical market in the face of historically low US housing starts. Industrial markets such as pallets and railway ties, traditionally markets for lower-value products, also have increased in relative importance in recent years. While housing starts are expected to eventually return to the long-term trend, an analysis of the current marketplace illustrates the importance of the construction markets to the hardwood industry. Potential new markets for emerging products that can make use of hardwoods also are derived from construction-based sectors, so the overall importance of housing and building construction to the hardwood industry is not likely to wane for the foreseeable future.
- A Specialized Data Crawler for Cross-Laminated Timber Information ResourcesThomas, Ed; Espinoza, Omar A.; Bora, Rahul; Buehlmann, Urs (2020)The Internet is composed of more than 6.2 billion Web pages and grows larger every day. As the number of links and specialty subject areas grows, it becomes ever more difficult to find pertinent information. For some subject areas, special-purpose data crawlers continually search the Internet for specific information; examples include real estate, air travel, auto sales, and others. The use of such special-purpose data crawlers (i.e., targeted crawlers and knowledge databases) also allows the collection and analysis of agricultural and forestry data. Such single-purpose crawlers can search for hundreds of key words and use machine learning to determine if what is found is relevant. In this article, we examine the design and data return of such a specialty knowledge database and crawler system developed to find information related to cross-laminated timber (CLT). Our search engine uses intelligent software to locate and update pertinent references related to CLT as well as to categorize information with respect to common application and interest areas. At the time of this publication, the CLT knowledge database has cataloged nearly 3,000 publications regarding various aspects of CLT.