Influence of different treatment parameters on penetration, retention and bleeding of creosote

IRG/WP 03-40255

Ö Bergman

Creosote is an extensively used preservative for transmission poles and sleepers. The purpose of this research was to investigate the treatment parameters necessary to achieve full sapwood penetration and minimum required retention and to avoid bleeding of creosote. It was carried out as a part of the European research project WOODPOLE. Transmission poles of Scots pine (Pinus sylvestris L.) previously air-dried under a roof, were creosote treated in a research plant. Before treatment each pole was cut into three pieces (logs). Each pole made a charge. The creosotes WEI type B and type C were used. A number of treatment processes were carried out using five poles per process. Different levels of pre-pressure and oil pressure were used as well as different duration of oil pressure. Heating of the logs in creosote before pre-pressure and after oil pressure was carried out for one or three hours. Retention was measured by weighing before and after treatment and by analysis. Processes with no or only a short period of heating before pre-pressure and after oil pressure showed most bleeding. Poles and stakes with different levels of retention were produced for field trials.


Keywords: Poles, creosote treatment, penetration, retention, bleeding, Pinus sylvestris

Conference: 03-05-18/23 Brisbane, Australia


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