To ensure the durability and safe operation of wood composite products, it is necessary to clearly understand how operating conditions affect the adhesive properties of materials. The aim of the study was to experimentally investigate the influence of operating conditions on the change in weight and size of samples with a base of chipboard and medium-density fibreboard, laminated with oak veneer using glues of different degrees of moisture resistance was experimentally investigated. The regularities of these factors effects on the materials and the strength of the glue joint have been established. It was found that the increase in weight of samples with a chipboard base was at the level of 6.25%. For medium-density fibreboard, the value was slightly different and was 4.3%. If the environmental conditions were combined, the indicators of chipboard and medium-density fibreboard samples decreased to 3.72 and 2.99%, respectively. It had also been established that the most stable was glue “Rakoll Express D3”. While the worst performance was demonstrated by the glue “Woodmax WR 13.50M”. The maximum increase in linear dimensions was recorded in chipboard samples with “Rakoll Express D3” glue – 5.25%. Stability coefficients were calculated, indicating a significant decrease in strength, especially under the influence of humidity and temperature at the same time. The least stable was the combination of medium-density fibreboard and “Woodmax WR 13.50M” glue. Instead, the best resistance was demonstrated by the combination of chipboard with “Rakoll Express D3” glue. It was found that the humidity of the environment has a more significant influence on the linear dimensions. The use of wood composites in structures where materials are exposed to changes in temperature, humidity, and ultraviolet radiation is important to ensure the long-term service and reliability of such products
wood materials, operating conditions, linear dimensions, wet environment, temperature and humidity fluctuations, destructive pressure
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