Bark extracts and their use in different bonding systems

Leena Suomi-Lindberg

Research output: Book/ReportReportProfessional

1 Citation (Scopus)

Abstract

Spruce bark extracts have proved to be a possible resource for replacing phenolic resin in different gluing systems. The quality of our spruce (Picea abies) bark extract is not so good. Stiasny number is low, between 50 - 60 varying even in extractions of this kind. Carbohydrate content is high and it has a negative influence on gluing quality. 10 % NaOH-extraction (on dry bark weight basis) gave the highest yield and polyphenolic content of extract when the extraction time was 60 min and temperature 80 °C. Extractions made in bigger scale gave better extraction results than small scale (laboratory) extractions. In gluing experiments we prepared plywood, particleboard and with normal resorcinol-phenolformaldehyde resin glued close-contact joints. A plywood gluing experiment was made also in industrial scale. Nine-ply birch plywood consisting of 1300 x 1300 x 1.5 mm birch veneers was then prepared. The results were very promising eve though the replaced amount of phenolic resin was not so high. All plywoods fulfilled the Finnish plywood standard SFS 2415 and the Finply quality requirements.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages35
ISBN (Print)951-38-2642-2
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume427

Fingerprint

plywood
bark
extracts
resins
Betula
Picea
resorcinol
particleboards
carbohydrate content
Picea abies
polyphenols
temperature

Keywords

  • spruce wood
  • bark
  • extraction
  • adhesives
  • adhesion
  • gluing
  • phenolic resins
  • bonding
  • plywood
  • particle boards

Cite this

Suomi-Lindberg, L. (1986). Bark extracts and their use in different bonding systems. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 427
Suomi-Lindberg, Leena. / Bark extracts and their use in different bonding systems. Espoo : VTT Technical Research Centre of Finland, 1986. 35 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 427).
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Suomi-Lindberg, L 1986, Bark extracts and their use in different bonding systems. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 427, VTT Technical Research Centre of Finland, Espoo.

Bark extracts and their use in different bonding systems. / Suomi-Lindberg, Leena.

Espoo : VTT Technical Research Centre of Finland, 1986. 35 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 427).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Bark extracts and their use in different bonding systems

AU - Suomi-Lindberg, Leena

PY - 1986

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N2 - Spruce bark extracts have proved to be a possible resource for replacing phenolic resin in different gluing systems. The quality of our spruce (Picea abies) bark extract is not so good. Stiasny number is low, between 50 - 60 varying even in extractions of this kind. Carbohydrate content is high and it has a negative influence on gluing quality. 10 % NaOH-extraction (on dry bark weight basis) gave the highest yield and polyphenolic content of extract when the extraction time was 60 min and temperature 80 °C. Extractions made in bigger scale gave better extraction results than small scale (laboratory) extractions. In gluing experiments we prepared plywood, particleboard and with normal resorcinol-phenolformaldehyde resin glued close-contact joints. A plywood gluing experiment was made also in industrial scale. Nine-ply birch plywood consisting of 1300 x 1300 x 1.5 mm birch veneers was then prepared. The results were very promising eve though the replaced amount of phenolic resin was not so high. All plywoods fulfilled the Finnish plywood standard SFS 2415 and the Finply quality requirements.

AB - Spruce bark extracts have proved to be a possible resource for replacing phenolic resin in different gluing systems. The quality of our spruce (Picea abies) bark extract is not so good. Stiasny number is low, between 50 - 60 varying even in extractions of this kind. Carbohydrate content is high and it has a negative influence on gluing quality. 10 % NaOH-extraction (on dry bark weight basis) gave the highest yield and polyphenolic content of extract when the extraction time was 60 min and temperature 80 °C. Extractions made in bigger scale gave better extraction results than small scale (laboratory) extractions. In gluing experiments we prepared plywood, particleboard and with normal resorcinol-phenolformaldehyde resin glued close-contact joints. A plywood gluing experiment was made also in industrial scale. Nine-ply birch plywood consisting of 1300 x 1300 x 1.5 mm birch veneers was then prepared. The results were very promising eve though the replaced amount of phenolic resin was not so high. All plywoods fulfilled the Finnish plywood standard SFS 2415 and the Finply quality requirements.

KW - spruce wood

KW - bark

KW - extraction

KW - adhesives

KW - adhesion

KW - gluing

KW - phenolic resins

KW - bonding

KW - plywood

KW - particle boards

M3 - Report

SN - 951-38-2642-2

T3 - Tutkimuksia / Valtion teknillinen tutkimuskeskus

BT - Bark extracts and their use in different bonding systems

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Suomi-Lindberg L. Bark extracts and their use in different bonding systems. Espoo: VTT Technical Research Centre of Finland, 1986. 35 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 427).