Visual grading of small-diameter poplars for peeling use

• Autorzy: Bayatkashkoli A. , Sharefpour M. , Shamsian M.

Identyfikatory

DOI

10.12841/wood.1644-3985.145.03

• Języki publikacji: EN

Abstrakty

EN

Small-diameter poplars (Populus euramericana, or Populus deltoids, or Populus nigra) are an important raw material resource for the wood and paper industry. Both manufacturers and governments are increasingly interested in obtaining this raw material from poplar plantations. A small-diameter poplar is between fifteen and thirty five centimetres in diameter at breast height. In this study, small-diameter poplars were graded visually for use in peeling. Traditional rules currently in use were applied when grading small-diameter poplars, and standard layer-sorting rules were used on the outputs from the peeling process. The field study has shown that standard sorting by layer doesn't correspond well when small-diameter poplars are sorted. For instance, the best small-diameter poplar is rarely classified as class A or B by standard layer sorting. In this research, small-diameter poplars are classified accurately using specific, alternative rules, and the grading scale ranges are presented. Some defects, such as knot and splits, have a strong influence on the quality of the final product, but often, existing standard-sorting methods do not reflect the degree to which the defects have affected the final product. A new method for classifying small-diameter poplars is presented, which groups the wood by its value in the final product.

Słowa kluczowe

EN

visual grading; small-diameter poplar; defect; output

• Wydawca: Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
• Czasopismo: Drewno : prace naukowe, doniesienia, komunikaty
• Rocznik: 2016
• Tom: vol. 59, nr 196
• Strony: 31--47
• Opis fizyczny: Bibliogr. 27 poz., rys., tab.

Twórcy

autor

Bayatkashkoli A.

• Department of Paper, Wood Technology and Sciences, College of Natural Resources, University of Zabol, Zabol, Iran

autor

Sharefpour M.

• Department of Paper, Wood Technology and Sciences, College of Natural Resources, University of Zabol, Zabol, Iran

autor

Shamsian M.

• Department of Paper, Wood Technology and Sciences, College of Natural Resources, University of Zabol, Zabol, Iran

Bibliografia

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• List of standards
• APA-PS1-95: 1995 National Institute of Standards and Technology (NIST) construction and industrial plywood. American Plywood Association
• BS EN 14081-2: Timber structures. Strength graded structural timber with rectangular cross section. Machine grading; additional requirements for initial type testing
• DIN 4074-1: Strength grading of wood - Part 1: Coniferous sawn timber
• EN 338, CEN: 2003 European Committee for Standardization [CEN] – Structural timber – strength classes
• ISIRI Number 1275: 1994 Institute of Standards and Industrial Research of Iran – acceptable defects for logs (and gradation)
• PR EN 14544: Timber structures - Strength graded structural timber with round cross-section – Requirements
• VPS-SRT-2: Structural round timber – grading – requirements for visual strength – grading standards

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.