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FIZYCZNE METODY DEZYNSEKCJI DREWNA DÓBR KULTURY Adam Krajewski, Wyd. SGGW, 197 s., il. 54, tab. 18, Warszawa 2001

100%

Mączyński D.

Ochrona Zabytków

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2003

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issue 1-2

232-233

EN

This publication, based on a habilitation dissertation written in the Department of Wood Technology at the Agriculture Academy in Warsaw, is a monographic study containing, i. a. a survey of world literature. The author listed heretofore accomplishments in wood desinsectisation attained with the help of assorted physical methods, and proposed an original method of research. The outcome of the studies has been verified by means of tests from the domain of mathematical statistics and confronted with earlier achievements of English and German researchers. Furthermore, the author also assessed views expounded in periodicals dealing with conservation. The discussed publication includes 25 conclusions classifying or rejecting particular physical methods of wood desinsectisation as well as rendering precise the technological conditions of their application.

2

KONSERWACJA ZABYTKÓW Z UŻYCIEM PROMIENI GAMMA PIĘTNAŚCIE LAT BADA I PRAKTYKI W POLSCE

100%

Krajewski A., Perkowski J.

Ochrona Zabytków

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2004

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issue 3-4

209-214

EN

The incidents of control of wood boring insects and incidents of wood, stone, paper and fabrics disinfection made in Interdepartment Institute of Radiation Technique of Technical University in Łódź are combined. IIRT is sole post in Poland which made radiation operations for museal objects. Radiation doses used in IIRT and foreign posts are compared. The conditions of investigations and practice in Poland are summarized.

3

Zwalczanie owadów - szkodników technicznych drewna za pomocą mikrofal

88%

Krajewski A.

Ochrona Zabytków

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1990

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issue 1

27-34

EN

In 1 9 8 5— 1 9 8 7 , in the Research and Conservation Branch of the Ateliers for Conservation of Cultural Property State Enterprise in Warsaw, studies were carried out on the disinsectization of wood by means of microwaves 12.2 cm (2 .4 5 G H z ) in length, emitted in the form of a scattered field. In the experiments tw o field devices with 6 0 0 W and 1 4 0 0— 2 4 0 0 W of power, and a microwave chamber with 1 0 0 0 W of power (fig. 2) were used. Heating of the air-dry w o od through the use of microwaves was of a jumping nature (fig. 3 ). After a rapid, several-minute heating through microwaves, there followed a significantly slowe cooling process. The quickest heating took place in the layers closest to the antenna of the field device, while the weakest heating was in the layers farthest away. In the case of the microwave chamber, the middle layers of w o od became the most heated. Heating of the wood by means of radio waves of a high and very high frequency depends on the thickness of the wood (fig. 4 ), the course of the fibres, the humidity and density, and on the strength of microwave action. In the presented publication these dependencies are discussed against the background of results given in literature. As a result of experiments conducted on the larvae of the common Cerambycid (Hylotrupes bajulus L.), the death watch beetle (Anobium punctaum De Geer) and the Criocephalus rusticus, it was determined that the first of the above is the most resistant to microwave action. The effectiveness of combatting the Cerambycid in pine, spruce and fir w o od by means of microwaves is very similar (fig. 5) and the latter can be generally treated as coniferous w o o d (fig. 6 ). The greater the power of the microwave device, the shorter the time necessary to kill the insects in the wood (fig. 7 ). W ithdrawing the antenna from the wood surface causes a decline in the resistance to microwave action in insect control (fig. 8) due to the decreasing intensity of the scattered field. A rectilinear dependency was found of the mortality of Cerambycid larvae on the temperature of the wood subjected to microwave action (fig. 9 ). The average temperarure of the wood subjected to microwave action had to exceed 80° С for it to be possib'e to obtain a 100% effect in combatting Cerambycid larvae. In this publication a polemic is taken up with the views of the non-thermic killing of the insects by means of microwaves. Similarly to other radio waves of high and very high frequencies, microwaves destroy all stages of development of insects in the thermic manner. Unfortunately these waves, due to the heating up of the wood, can cause damages to the coats of paint, lacquer, polish and waxing, and can cause melting down of resin. Microwaves, in spite of some earlier information, damage gilding very strongly (fig. 1 0 ). It has not been confirmed, however, that wood subjected to microwave action in the presence of tw o -in ch steel nails burns. It was found that wood does burn without the presence of metal, when the shortest time of microwave action necessary for a 100% disinsectization of wood is exceeded. In the course of combatting insects, a relatively small area of w ood can be covered with an electromagnetic field each time. It is also necessary to pay great attention that the people operating the equipment and others not be within the emitted field. With the appropriate safety measures this danger can be avoided. The disinsectization method discussed should be limited to disinsectization of w o od withou t coatings, e.g. the wood of ceiling beams in brick or other houses or the wood of traditional folk architecture in museums in the open air. This, however, is a relatively labour-consuming (and therefore expensive) method, requiring specialized servicing and a strict observance of the technological regime.

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FIZYCZNE METODY DEZYNSEKCJI DREWNA DÓBR KULTURY Adam Krajewski, Wyd. SGGW, 197 s., il. 54, tab. 18, Warszawa 2001

KONSERWACJA ZABYTKÓW Z UŻYCIEM PROMIENI GAMMA PIĘTNAŚCIE LAT BADA I PRAKTYKI W POLSCE

Zwalczanie owadów - szkodników technicznych drewna za pomocą mikrofal