Mapping of strength reduction of particleboard subjected to various climatic conditions using a climate deterioration index

摘要

The relationship between climatic factors and strength reduction of particleboard subjected to various climatic conditions at eight sites in Japan was investigated. Climatic factors such as mean temperature, sunshine duration, and precipitation were analyzed by principal component analysis. The first principal component score was introduced as a climate deterioration index (CDI). The particleboard strength reduced in high-CDI area. In this useful index for mapping deterioration zones, the CDI distribution was mapped. The strength reduction was predicted with multiple regression analysis using the CDI and exposure time, and the distribution of strength reduction after the outdoor exposure test was mapped as well. Strength reduced significantly in the southern area, particularly along the Pacific Ocean coast. The high-CDI area had high temperature and long sunshine duration. High temperature led to large strength reduction, and long sunshine duration accelerated the strength reduction process. Conversely, strength reduction in the northern area was smaller than that in the south. The mapping of CDI and strength reduction aided the understanding of the deterioration zone.