| LIU Luo-xi,LUO Ya-ping.Peeling Characteristics of Removed Coating on Rubber Outsole Surface[J],46(12):168-174 |
| Peeling Characteristics of Removed Coating on Rubber Outsole Surface |
| Received:June 04, 2017 Revised:December 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.027 |
| KeyWord:coating peeling rubber outsole maximum peeled area pattern |
| Author | Institution |
| LIU Luo-xi |
People's Public Security University of China, Beijing , China |
| LUO Ya-ping |
People's Public Security University of China, Beijing , China |
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| Abstract: |
| The work aims to study peeling characteristics of removed coating on rubber outsole surface and corresponding values in criminal investigation and identification. Footwear impression samples of 86 police shoes were collected every day with Fe3O4 powder and self-adhesive films in 27 days. Overall coating peeling pattern was observed and then the coating peeling forms were classified into different types. Following items were counted: outsoles with different parts showing peeling characteristics, maximum peeled area of different outsole coatings, disappearance time of coating peeling characteristics in different positions of the outsoles, and maximum peeled area of outsoles still showing coating peeling characteristics. Finally, change rule of coating peeling patterns was observed. Two different patterns were reflected in the coating peeling characteristics: coating peeling pattern of coating not being peeled and that generated by the peeled coating. Largest number of outsoles exhibited greatest degree of peeling in 0~2 days after recent rainy day. Maximum peeled area of the coating was mainly in the scope of 0.019~1.451 mm2, only 9 outsoles painted thickly exhibited large area of peeled coating. Coating peeling patterns mainly appeared in arch part, posterior ball part, anterior part and slightly scratched part. After being worn for one month, 28 outsoles still exhibited coating peeling characteristics, including the above-mentioned 9 outsoles being painted thickly. The maximum peeled area of these 28 outsoles were mostly in the scope of 0.204~3.805 mm2. Coating in the anterior part stopped peeling first. The coating peeling characteristics in arch part lasted for the longest time, followed by those in the posterior ball part, and those in the anterior part the shortest. The general change rule of coating peeling patterns was that they shrunk from edge to inside and disappeared gradually. The reflective ability of coating peeling characteristics depends on volume of coating pained on outsoles, water immersion environment, adhesive force of the object, geometry of object surface and binding capacity of peeled part. The specificity and stability of paint removing characteristic are related to volume of the painted coating and the part in which they appear. Coating peeling characteristics are of certain significance to criminal investigation and identification. |
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