Research On The Factors Influencing Soles’ Skid Resistance

The antiskid performance of sole is closely related to the walking safety of human body.To improve the antiskid performance of shoes and ensure human body safety,it is an important premise to fully understand the influencing factors of antiskid performance of shoes and the interrelationship between the factors.The author works in a national Footwear Quality&Technical Supervision and Testing Institute,so basing on a large number of analysis and testing of all kinds of shoes,this paper studies the antiskid performance of sports shoes,leisure shoes and leather shoes;and studies the influence of sole materials,contact surface and contact surface pollutants,sole pattern,sole hardness and other aspects on the antiskid performance of sole,so as to provide theoretical guidance&advice for shoe production.The experimental results show that For EVA,PVC,TPR,polyurethane and rubber sole,the reduction of friction coefficient in the case of drying to distilled water is less than that in the case of drying to sodium dodecyl sulfate aqueous solution,and the reduction of friction coefficient in the case of sodium dodecyl sulfate aqueous solution is less than that in the case of glycerin aqueous solution.Besides,the friction coefficient of the quartz stone with dry,distilled water and glycerin solution is:rubber>polyurethane>TPR>PVC>EVA.The friction coefficient of the quartz with sodium dodecyl sulfate solution is:rubber>polyurethane>PVC>TPR>EVA.Different contact surface pollutants have a great influence on the antiskid performance of the sole.When the rubber sole is dry,the sliding friction coefficient on the ceramic tile is the smallest;when distilled water and sodium dodecyl sulfate solution are available,the sliding friction coefficient on the glass is the smallest;when distilled water,sodium dodecyl sulfate solution and glycerin solution are available,the sliding friction coefficient on the ceramic tile is the largest.In addition,the friction coefficient of rubber sole on the interface of ceramic tile,quartzite and steel plate is in the order of drying condition,distilled water,sodium dodecyl sulfate and glycerin aqueous solution;and when on the interface of glass,the friction coefficient of rubber sole is in the order of drying condition,glycerin aqueous solution,distilled water and sodium dodecyl sulfate.Under the condition of dry and distilled water,the coefficient of friction increases with the increase of the height and width of the pattern.In the dry condition,the coefficient of friction decreases with the increase of groove width.Under the condition of distilled water,the friction coefficient increases with the increase of groove width,and when it reaches a certain value,the increase of friction coefficient decreases.In a certain range,the sole with larger pattern spacing has better antiskid performance.The sole with small pattern width and low pattern height has poor antiskid performance,especially on the wet and slippery contact surface.The longitudinal pattern has poor anti-skid performance and the transverse pattern has good anti-skid performance However,in order to meet the daily activities,the sole pattern should have multi directionality.The back edge of the sole heel should not be designed at 90°.The heel with fillet(arc transition)design can greatly improve the friction performanceThe friction coefficient of sole decreases with the increase of hardness.When the friction coefficient is 0.16-0.19,the hardness has little effect on the friction coefficient;when the friction coefficient is 0.48-0.57,the hardness has a relatively large effect on the friction coefficient.