Wood adhesives fromPinus radiata bark

Yazaki, Y.; Collins, P. J.

doi:10.1007/bf02615220

Cited by 34 publications

(11 citation statements)

References 8 publications

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“…Barks from different locations and after different periods of storage also affect the yield; therefore, all these factors have been kept constant. The extraction yield mainly depends on a number of factors,9, 10 such as the solvent, duration of extraction, particle size of the bark fraction, and pH. A multiple‐step squeeze‐extraction process with hot water and aqueous NaOH has resulted in high‐yield but low‐adhesive‐property products 11.…”

Section: Discussionmentioning

confidence: 99%

2012 American college of cardiology foundation/society for cardiovascular angiography and interventions expert consensus document on cardiac catheterization laboratory standards update: American college of cardiology foundation task force on expert consensus documents society of thoracic surgeons society for vascular medicine

Bashore¹,

Balter²,

Barac³

et al. 2012

Cathet Cardio Intervent

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Section: Discussionmentioning

confidence: 99%

2012 American college of cardiology foundation/society for cardiovascular angiography and interventions expert consensus document on cardiac catheterization laboratory standards update: American college of cardiology foundation task force on expert consensus documents society of thoracic surgeons society for vascular medicine

Bashore¹,

Balter²,

Barac³

et al. 2012

Cathet Cardio Intervent

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“…When the polyflavanoids are subjected to highly alkaline conditions, rearrangement of Α-ring structure of the polyflavanoids takes place so that the polyflavanoids are likely to have lost their reactivity resulting in poor gluebond quality (Yazaki and Aung 1989;Yazaki and Collins 1994). Accordingly, the pH of the extractives solution obtained from the 1 % aqueous NaOH solution at higher temperatures and pressures is a very critical factor for obtaining wood adhesives of good quality.…”

Section: Comparisons Between the Conventional Hot Water And The Hot Cmentioning

confidence: 98%

“…Since the ratio of bark to solvent for the extraction is also one of the important factors for the commercial production of tannin extracts (Yazaki and Collins 1994), the effect of different ratios of bark to solvent (1:4 and 1 : 9) was examined. The extraction at 100°C with no time at temperature using a ratio of bark to solvent (1:9) yielded slightly higher polyflavanoids (11.8% at 4atm, 11.9% at lOatm) than those (11.0% at 4atm and 10.9% at lOatm) using the ratio of bark to solvent (1 :4).…”

Section: Effects Of Bark Particle Size and Ratio Of Bark To Solventmentioning

confidence: 99%

Extraction of Polyflavanoids from Radiata Pine Bark Using Hot Compressed Water at Temperatures Higher than 100 °C

Inoue¹,

Asaga²,

Ogi³

et al. 1998

Holzforschung

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Radiata pine bark was extracted using hot compressed water with or without 1 % NaOH at temperatures of 100 °C and higher under different pressures for various holding times. The yields of extractives and polyflavanoids obtained from the extraction of the bark using hot compressed water without NaOH were much lower than those from conventional extraction at ambient pressure. This result has confirmed our previous experience. However, when 1 % NaOH (based on the weight of the oven-dried bark) was added to the compressed water system, the yields of the extractives and polyflavanoids increased remarkably, and the highest yield (31.3%) of the extractives was obtained at a peak temperature of 140°C and a pressure of lOatm followed by immediate cooling. Furthermore, the bark particle size and the ratio of bark to solvent affected to a much lesser extent the yield of the extractives in this new method, compared with that in the conventional method. The solubility behaviour of the tannin extracts in the hot compressed water is discussed in relation to the extractives yield from the extraction of the bark at temperatures higher than 100°C and at pressures higher than ambient.

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“…This test permit us to appreciate the adhesive capacity of tannins [16,17]. Yazaki et al [18] assessed that the minimum Stiasny value to produce high quality adhesives is 65%. However, Ping et al [15] produced good adhesives quality with a Stiasny number of 45%.…”

Section: Stiasny Indexmentioning

confidence: 99%

Extraction and Characterization of Aucoumea klaineana Pierre (Okoume) Extractives

Anris¹,

Arsene²,

Vidal³

et al. 2019

Journal of Renewable Materials

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In order to promote convenient strategies for the utilization of wood wastes from aucoumea klaineana pierre (okoume) timber industry, various chemical analysis were carried out on samples from different origins. Total extractives content of the bark, sapwood and heartwood of okoume were evaluated. thermogravimetric analyses were performed and the stiasny number was calculated. it was found that the bark was richer in fatty acid of high molecular weight while the sapwood was rich in fatty acid of low molecular weight. the condensed tannins content varied according to the origin and the part of the tree. these new findings should be useful for green okoume based tannin adhesives.

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Wood adhesives fromPinus radiata bark

Cited by 34 publications

References 8 publications

Extraction of Polyflavanoids from Radiata Pine Bark Using Hot Compressed Water at Temperatures Higher than 100 °C

Extraction and Characterization of Aucoumea klaineana Pierre (Okoume) Extractives

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