Assessment of the chipping process of beech (
            <i>Fagus sylvatica</i>
            L.) wood: knives wear, chemical and microscopic analysis of wood

Krilek, Jozef; Čabalová, Iveta; Výbohová, Eva; Mamoňová, Miroslava; Ťavodová, Miroslava; Melicherčík, Ján; Gendek, Arkadiusz; Aniszewska, Monika; Todaro, Luigi; Giudice, Valentina Lo

doi:10.1080/17480272.2023.2259343

Cited by 2 publications

(3 citation statements)

References 47 publications

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“…The dendromass chipping process is affected by various operating parameters such as wood, assortment, speed, and chipper knife geometry (Uhmeier 1995;Twaddle 1997;Smith and Javid 1999;Hellström et al 2008;Abdallah et al 2011;Kováč et al 2011;Spinelli et al 2013). However, it should be noted that different wood fractions are produced to reduce the size of the wood (chipping), and it is known that a greater degree of fragmentation requires higher energy consumption (Warguła et al 2022;Krilek et al 2024). Choi et al (2019) showed that doubling the size of the drum chipping machine produced (from 40 mm to 80 mm) was characterized by 30% increase in productivity.…”

Section: Evaluation Of Sieve Analysismentioning

confidence: 99%

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Research of chipper knives with a modified cutting edge for the production of dimensionally uniform wood chips

Krilek,

Gendek,

Aniszewska

et al. 2024

BioRes

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The paper is focused on the research of chipper knives with a straight and modified cutting edge in order to determine the energy consumption of the chipping process and the uniformity of the size of the fractions of the designed chipper knife for the production of dimensionally uniform chips. The research took place on two different tree species where the representative of the coniferous tree was the common spruce (Picea abies) and the deciduous tree was the winter oak (Quercus petraea). The research took place on a PTO-powered (power take off) disc chipping machine where it was not modified for research purposes. The results showed that a knife with a modified cutting edge is higher in terms of energy consumption than chipper knives with a straight cutting edge. From the evaluation of the sieve analysis for a chipper knife with a modified cutting edge, the energy chip of uniform granulometric composition is a homogeneous bulk material.

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Section: Evaluation Of Sieve Analysismentioning

confidence: 99%

“…

PEER-REVIEWED ARTICLE bioresources.cnr.ncsu.edu Krilek et al (2024). "Blade for uniform wood chips," BioResources 19(2), 3653-3667.

…”

mentioning

confidence: 99%

Research of chipper knives with a modified cutting edge for the production of dimensionally uniform wood chips

Krilek,

Gendek,

Aniszewska

et al. 2024

BioRes

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show abstract

“…When chippers are used, knife maintenance and overall conditions are paramount [10,11] and can tip the balance of the economy of operations with higher productivity and better product quality [12] and thus higher product value. Therefore, knife wear has a dominant effect on fuel consumption, chipper productivity, and product quality [12][13][14][15][16], and this effect is generally stronger than the effect of tree species or chipper configuration [14].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Knife Wear and Sharpening Mode on Chipper Productivity and Delays

Mihelič,

Vusić,

Ursić

et al. 2024

Forests

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The production of wood chips can be achieved using different types of wood chippers whose productivity can be influenced by many factors including proper knife management. Research was conducted to determine the productivity of the new Diamant chipper in chipping air-dried tops stacked at a roadside landing and to compare the efficiency of dry sharpening and wet sharpening in restoring chipper productivity, the time required by dry sharpening with that of knife replacement, and the cost of dry sharpening to knife change in real-life conditions. To clearly define the influence of knife management, a model of the effect of knife wear on chipper productivity was produced. Analysis of variance was used to check the significance of any differences in chipping and total time consumption per cycle. Multiple regression was used to express the relationship between chipping time consumption per cycle and the cumulated mass processed by a set of knives—the latter taken as an indicator of knife wear. The study lasted 10 full workdays, included a total of 136 truckloads or 3560 t of fresh wood chips (or green tons = gt), and resulted in the average productivity of 59.0 gt per productive chipping hour (excluding all delays) or 39.4 gt per machine scheduled hour (including all delays). Delays represented 37% of total worksite time. Knife management (dry sharpening or change) accounted for 30% of the total delay time due to raw material contamination. Dry sharpening took 30% less time than a full knife change. As wear accumulated and knives lost their edge, the chipping time per cycle increased from 25 in the first cycle (full truck load) to 38 min in the third cycle. The presented study offers robust productivity figures, together with a reliable estimate of the productivity losses caused by knife wear, and could help improve knife management in order to increase chipper productivity as well as reduce unnecessary delays.

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Assessment of the chipping process of beech ( Fagus sylvatica L.) wood: knives wear, chemical and microscopic analysis of wood

Cited by 2 publications

References 47 publications

Research of chipper knives with a modified cutting edge for the production of dimensionally uniform wood chips

Research of chipper knives with a modified cutting edge for the production of dimensionally uniform wood chips

The Effect of Knife Wear and Sharpening Mode on Chipper Productivity and Delays

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