Influence of Pressing Schedule and Adhesive Content on the Rheological Behavior of Wood Fiber-Furnish Mats

Shalbafan, Ali; Thömen, Heiko (2022). Influence of Pressing Schedule and Adhesive Content on the Rheological Behavior of Wood Fiber-Furnish Mats Materials and Structures, 15(4), p. 1413. Springer 10.3390/ma15041413

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In this study, for a better understanding of the hot-pressing process, the influence of adhesive content (AC) on various features of a typical pressing schedule for medium-density fiberboard (MDF) production, including fiber mat compressibility, heat transfer during hot-pressing, density profile and board properties, were evaluated. It was found that increasing the AC (urea formaldehyde) leads to faster heat transfer towards the mat’s central plane, mainly due to higher heat release from the adhesive polycondensation reaction. Moreover, the results indicate that the time needed to reach the critical mark of 100 �C in the central plane of the mat depends on the duration of the first densification level (FD). Importantly, the pressure peaks (pmax and p2nd) needed for mat densification are significantly reduced when increasing the AC, which might be attributed to the slippery effect created by the adhesive on the fiber surfaces. The duration of the FD also showed obvious effects on the intermediate density maxima ($inter) and the core layer density ($core). In general, the physical and mechanical properties of MDF panels are significantly impacted by the pressing schedule and AC. All in all, the results of this study are valuable information for refining existing rheological models to improve their accuracy and their ability to simulate the vertical density profile during industrial production.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Architecture, Wood and Civil Engineering School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Wood Chemistry School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Adhesive Technology School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Material Emissions School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Furniture Development School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Surface Treatment School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Composite Materials BFH Centres and strategic thematic fields > BFH Centre for Wood - Resource and Material School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM > Biopolymers and Wood Chemistry group FGBH School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM > Wood Modification and Gluing Technology group FGHV School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM > Materials and Life Cycle Assessment group FGWO
Name:	Shalbafan, Ali and Thömen, Heiko
Subjects:	T Technology > T Technology (General) T Technology > TH Building construction T Technology > TP Chemical technology
ISSN:	1359-5997
Publisher:	Springer
Language:	English
Submitter:	Corinne Amstutz Hugi
Date Deposited:	09 Mar 2022 12:37
Last Modified:	09 Mar 2022 12:37
Publisher DOI:	10.3390/ma15041413
Uncontrolled Keywords:	medium-density fiberboard; density profile; adhesive content; mat-furnish; modelling; rheology; pressing schedule
ARBOR DOI:	10.24451/arbor.16671
URI:	https://arbor.bfh.ch/id/eprint/16671