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Articles containing the keyword 'viilu'

Category : Article

article id 5261, category Article
Matti Kärkkäinen. (1986). Koivuvaneritukkien ja -runkojen arvosuhteet. Silva Fennica vol. 20 no. 1 article id 5261. https://doi.org/10.14214/sf.a15440
English title: Value relations of birch veneer logs and stems in Finland.
Original keywords: koivu; järeys; vaneri; mallinnus; koivuvaneritukki; viilun sorvaus; puustamaksukyky
English keywords: Betula pendula; Betula pubescens; simulation; plywood; log size; birch veneer; veneer logs; value of raw material
Abstract | View details | Full text in PDF | Author Info

A model was developed in order to describe the peeling of veneer for determining value relationship for birch veneer logs and stems. The model was based on selling prices of veneer and other products as well as processing costs. The model was utilized for determining the effect of various input variables on the log value.

According to the results, the effect of tree size was important for the value of raw material. Even knottiness had an effect although only in the higher manufacturing costs of knotty veneer were taken into account. Pruning was a method to increase substantially the proportion of knotless veneer.

The PDF includes an abstract in English.

  • Kärkkäinen, E-mail: mk@mm.unknown (email)
article id 5018, category Article
Pertti Laakso, Olli Saikku. (1979). Havaintoja karsituista männyistä sorvatun viilun laadusta. Silva Fennica vol. 13 no. 1 article id 5018. https://doi.org/10.14214/sf.a14872
English title: Observations on the quality of veneer from pruned Scots pine stems.
Original keywords: mänty; pystykarsinta; laatu; vaneri; viilu
English keywords: Pinus sylvestris; Scots pine; pruning; quality; veneer
Abstract | View details | Full text in PDF | Author Info

The material was obtained from Scots pine (Pinus sylvestris L.) stems which were pruned 27 years earlier up to the height of 5–6 m. Rotary cutting was made from 16 pruned stems and 3 unpruned ones. The length of bolts was 70 cm and the thickness of veneer 1.5 mm. The proportion of good quality veneer was 46% in pruned stems and 14% in the others. Veneer with exellent quality was obtained from pruned stems up to the height of tree meters, that is to say a little under the pruning line.
The PDF includes a summary in English.

  • Laakso, E-mail: pl@mm.unknown (email)
  • Saikku, E-mail: os@mm.unknown

Category : Article

article id 7163, category Article
Jaakko Meriluoto. (1965). Raaka-ainetekijöiden vaikutus sorvatun koivuviilun määrään ja laatuun. Acta Forestalia Fennica vol. 80 no. 1 article id 7163. https://doi.org/10.14214/aff.7163
English title: The influence of raw material factors on the quantity and quality of rotary cut birch veneer.
Original keywords: raaka-aine; laatu; vaneri; koivuviilu; vanerikoivu; saanto
English keywords: yield; quality; veneer; birch veneer; raw-material; bolt size
Abstract | View details | Full text in PDF | Author Info

The objective of the present investigation was to clarify the influence of raw material on the quantity, and especially quality of rotary cut birch veneer by running cutting tests with constant tool setting under factory conditions and with bolts of normal size. The quality of the veneer was mainly examined in laboratory.

The result showed that with an increase in bolt size the yield increases and reaches the maximal value in the diameter range of 251–275 mm and 226–250 mm for 60-inch and 50-inch bolt, respectively. With a decrease in bolt length the yield becomes higher. With the increase in the bolt size the quality of the veneer improves.

Defects in the shape of the bolt, such as crookedness, taper and oval form, decrease the yield. The good quality of the bolts affects most the yield of full-size sheets. Increase of knottiness decreases the yield by 4–5%. Lowering of the bolt temperature below 0 °C causes a sharp decline in the yield. Moisture content of the wood did not markedly affect the yield, but it improved the quality of the veneer. The minimum moisture content was 75%.

For the technical quality of the veneer, bolt temperature was the most decisive raw material factor. Also shape defects, of which crookedness was most serious, decreased the technical quality. Increase in summerwood percentage improved the quality.

The PDF includes a summary in English.

  • Meriluoto, E-mail: jm@mm.unknown (email)

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