Proposal for soil release operation in testing for soil resistance and release of textiles

Abstract

The purpose of this study was to determine the influence of the operators on the soil release operation in the testing for soil resistance and release of textiles, based on the rate of released soil particles and the weight of adhered soil particles. A prototype release equipment was fabricated. Release operations were performed by the equipment and by the operators. The results of the release operation using the prototype release equipment showed that the rate of released soil particles and weight of adhered soil particles were constant values due to the tension applied to the specimen, the composition, the weave structure and the threads. The results of the release operation in which the operators were divided into a training group and a non-training group, showed no difference in weight of adhered soil particles between the groups of operators. Therefore, it was found that the condition of the specimen with soil on it did not differ significantly between the groups. On the other hand, the standard deviation was smaller for the training group than for the non-training group, suggesting that training of soil release operation had the effect of improving the accuracy. A comparison of the prototype release equipment and the operators show that variation was found to be 2 to 4 times greater for the operators than for the prototype release equipment. This suggests that the variability of the specimen with soil on it produced by the operators may be propagated to the grading.