Research on thermal characteristics of labor protection gloves in use
Engage in labor and production activities in cold climates. Maintaining the flexibility of your fingers is crucial. There are many tasks that need to be done with the help of human fingers. When the fingers are numb, you can only rely on visual observation to determine the placement of the object. This method can partially compensate, but the effect is poor. The gloves themselves will affect the work of the hand, and if the low temperature is added, the work efficiency will be further reduced.
When the thermal insulation performance of the gloves is insufficient, the skin temperature of the hand will gradually decrease from the normal 28qC. According to reports. When the skin temperature of the fingers drops to about 15~20qc, the skillful activities of the hand will decrease; when the skin temperature drops below 8qC, the sensitivity of the hand will be severely weakened. The accident rate will increase; when the finger skin temperature is lower than 4.4qC, the fine work ability of the hand is almost completely lost.
In view of the finger skin temperature is closely related to the degree of numbness. Therefore, the finger skin temperature can be used as the original parameter of sensory sensitivity to estimate the fine work efficiency of the hand. When the skin temperature of the finger is higher than 15~(2, there is no significant change in the decline of manual work ability, so people generally set the skin temperature of the finger at 15~(2 as the minimum limit that the manual work efficiency is not affected.
Some foreigners have used two experimental methods, the Torso Heating Test (THT) and the Hand Heating Test (HHT), to study the factors affecting the flexibility of fingers. The experimental results show that although both THT and HHT methods heat the finger skin temperature to a comfortable 31~C, since the THT method heats the human torso, the blood flow of the fingers is 8 times higher than that of the HHT method. The use of THT method can make people working with bare hands in a 250 (2 environment) maintain the flexibility of the fingers, which is mainly due to the increase of blood perfusion in the skin due to capillary dilation, thus making the fingers feel comfortable; on the contrary, the HHT method makes the fingers feel comfortable. Flexibility decreases slowly.
Therefore, direct hand heating is difficult to improve the flexibility of the fingers, while heating the torso can increase the blood flow of the fingers. Thereby improving the flexibility of the fingers. In cold climates, the key factor affecting finger flexibility is the amount of blood flow to the finger.