Abstract
Adhesive bonding of wood plays an increasing role in the forest products industry and is a key factor for efficiently utilizing timber and other lignocellulosic resources. In this work, we obtained five soy meal products through commercial sources or in-house preparations. The protein content was 49.6%, 56.9%, 66.2%, 86.3%, and 91.9% for untreated defatted soy meal, pH 8.5 water washed meal, neutral water washed meal, commercial protein isolate, and in-house prepared protein isolate. The adhesive performances measured by the maximal dry and soaked shear strength of the bonded maple veneers at break were not exactly in the same order of the protein content, indicating that other components (e.g. carbohydrates, metals) might also have played certain roles in the adhesive ability of these products. Data at two press temperatures (i. e. 100, and 130 <sup>o</sup>C) with or without the addition of tung oil revealed that water washed soy meals behaved more like untreated meal than soy protein isolates. This observation is different from a recent report on the effect of water washing on cottonseed meal products. Thus, further elucidation of the mechanisms or causes of the differing effects of water washing would shed light on the adhesive mechanisms of the two types of oilseed meal materials, thus optimizing use of these materials and their fractions for wood bonding.
Highlights
Adhesive bonding of wood plays an increasing role in the forest products industry and is a key factor for efficiently utilizing timber and other lignocellulosic resources
The purpose of this work was to 1) evaluate if the economic water washing way can be applied to improve the adhesive performances of soy meal products and 2) increase our general knowledge of the adhesive mechanisms of oilseed meal products by comparison of the data of the soy meal products with their cottonseed counterparts
They named the insoluble fraction as insoluble carbohydrates (IC)
Summary
Adhesive bonding of wood plays an increasing role in the forest products industry and is a key factor for efficiently utilizing timber and other lignocellulosic resources. SPI is obtained from defatted soy meal or flour, but is about 10 times more expensive than soy meal (Frihart et al, 2013). For better and economical use of different soy products, Lorenz et al (2015) compared the wood adhesive performance of a variety of commercial soy flours, protein concentrates and isolates. They reported that the carbohydrate interference is only part of the adhesive difference between commercial soy flour and purified soy proteins (isolate and concentrate). We (He et al, 2014c) found, in seeking the enhanced utilization of defatted cottonseed meal, that higher protein content in cottonseed meal fractions did not necessarily lead to higher adhesive properties
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
