Tips to discuss the reasons for the common unqualified test items for safety shoes

First, the lack of core production technology

1. The material of the same material, such as the sole, is replaced by a color, and its oil resistance test results are sometimes very different;

2. To produce the same kind of material, it is necessary to allow it to meet a certain quality inspection requirement, but also to meet another seemingly contradictory quality inspection requirement. It is often difficult for manufacturers to take both measures into consideration. Permeability and coefficient tests on shoe materials that are qualified for both water penetration and water absorption performance tests;

3, the production of the same batch of products, some tests qualified, some tests failed, quality and performance fluctuations, such as the entire shoe antistatic performance test, which requires high technical content, not only to control the resistance range of the sole, but also do a good conductive system The structure of the arrangement and process processing.

Second, the lack of R & D personnel and skilled personnel

1, the same kind of material, re-check several times, can not pass, such as the entire shoe anti-skid test, which requires R & D personnel and skilled personnel to have a good knowledge base and operating skills, the formula of the sole, tooth pattern design As well as the implementation of the production, the quality of its anti-slippage is greatly required;

2, the same design, different choice of materials, resulting in disparity between the test results too far, which requires R & D personnel have a deeper understanding and use of materials;

3, the same material, the same equipment, different skills personnel operation, the test results are sometimes far worse, such as the adhesion of the upper and the sole, the adhesion between the underlying layer, etc., which requires skilled personnel to have better skills and Skill stability and so on.

Third, the improvement of quality requirements and the update of detection methods

The increase in quality requirements of consumer countries and consumers and the renewal of testing methods on the most common non-conformity testing items for safety shoes in Europe are mainly reflected in the non-slip detection method. The update of anti-skid detection methods and the improvement of their quality requirements directly result in Many European safety footwear slip detection items failed.

Fourth, the detection limit of the standard detection method and not perfect

1, in the non-slip detection method, the test sample needs to be polished before the test, the method does not specify the specific degree of grinding, which directly affects the test results of unqualified errors, in addition, the test contact surface and test conditions to determine, There is a theoretical and practical gap, which directly correlates the accuracy of the unqualified quality requirements;

2. In the non-metallic anti-puncture midsole anti-puncture force detection method, the needle passes through the non-metallic anti-puncture bottom plate 1 mm instrument requirements and determines that there is only a model statement, which directly relates to the unqualified quality requirements of the accurate judgment, etc. .