Abstract
The main objective of the study was to determine the effect of impregnation of the paper core with acetylated starch on the mechanical properties and absorbed energy in the three-point bending test of wood-based honeycomb panels under varying temperatures and relative air humidity conditions. Nearly six hundred beams in various combinations, three types of facings, three core cells geometries, and two paper thicknesses were tested. The experiment results and their statistical analysis prove a significant relationship between the impregnation of paper with modified starch and mechanical properties. The most effective in absorbing energy, the honeycomb panels, consisted of a core with a wall thickness of 0.25 mm and a particleboard facing.
Highlights
Production of paper products in 2020 reached the level of 420 million tons
It is assumed that the life cycle of cellulose fiber in Europe has an average of 3.5 times its use [3,4], it is possible up to 6 times
For beams with the same facings P30, H25 and H20, in dry conditions D, and for orthotropy Y, the bending strength increases by 30.4%, 28.6%, and 34.0%, respectively, and the direction of orthotropy Y, the bending strength increases by 30.4%, 28.6%, and 34.0%, in tropical conditions W by 46.7%, 44.8%, and 40.0%, respectively
Summary
Production of paper products in 2020 reached the level of 420 million tons. Compared to 1980, this means an increase of 250% [1]. It is assumed that the life cycle of cellulose fiber in Europe has an average of 3.5 times its use [3,4], it is possible up to 6 times. The quality of the paper means its high mechanical strength to tearing, bending, compression, and resistance to moisture [6]. Kraft liner is made by chem ical defibering with at least 80% virgin fibers. It is widely used as a packaging material [7]. In the range of moisture content of the paper from 0% to the fiber saturation point (about 23%), its mechanical properties decrease even by 50% [8,9,10]. Pohl [11] described the influence of the paper’s sizing on the reduction of tensile strength
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