What is the effect of the processing temperature of EVA shoe molds on material properties?
Publish Time: 2025-03-13
In the field of shoe mold manufacturing, ethylene-vinyl acetate copolymer (EVA) has become one of the popular materials for making shoe molds due to its excellent flexibility, impact resistance and good processing performance. However, the processing temperature of EVA shoe molds is not set arbitrarily, and it has a subtle and far-reaching impact on the performance of the material.During the processing of EVA materials, they need to go through stages such as heating, melting, and molding. The choice of processing temperature is directly related to the fluidity, crystallinity, molecular chain arrangement and final physical and mechanical properties of EVA materials. Generally speaking, the molding temperature range of EVA is between 120°C and 170°C. This temperature range is the key to ensure that the material is fully melted, flowed and molded.When the processing temperature is too low, the EVA material may not be completely melted, resulting in poor fluidity and difficulty in filling the complex structure of the mold. This will not only affect the molding quality of the shoe mold, but may also cause defects on the surface of the shoe mold, such as shrinkage holes and bubbles. In addition, low-temperature processing may also cause irregular arrangement of the molecular chains of the EVA material, thereby affecting its physical and mechanical properties, such as tensile strength and tear strength.On the contrary, when the processing temperature is too high, although the fluidity of EVA materials will be enhanced, it may also bring a series of problems. First, high temperature will accelerate the thermal oxidation degradation of EVA materials, resulting in a decrease in material performance. Secondly, too high a temperature may also cause the EVA material to expand excessively in the mold, shrink and deform after cooling, and affect the dimensional accuracy of the shoe mold. In addition, high-temperature processing may also increase energy consumption and increase production costs.Therefore, in the processing of EVA shoe molds, it is very important to choose a suitable processing temperature. This requires comprehensive consideration of factors such as the specific EVA brand, mold structure, and molding method. Generally speaking, the optimal processing temperature range can be determined through testing and optimization.In addition to the processing temperature, the performance of EVA shoe molds is also affected by other factors, such as mold temperature, injection pressure, injection speed, etc. These factors are interrelated and jointly affect the final quality of EVA shoe molds. Therefore, in the process of shoe mold manufacturing, it is necessary to comprehensively consider various factors and ensure the performance and quality of EVA shoe molds through fine process control and optimization.In actual production, in order to ensure the stable performance of EVA shoe molds, strict monitoring and management of the processing process are also required. This includes regular maintenance and upkeep of processing equipment to ensure the accuracy and stability of the equipment; strict quality inspection of EVA materials to ensure that the performance of the materials meets the requirements; and recording and analyzing the processing process to promptly discover and solve problems.In summary, the processing temperature of EVA shoe molds has a subtle and far-reaching impact on material properties. By selecting the appropriate processing temperature range and taking other factors into consideration, it can be ensured that the performance and quality of EVA shoe molds meet the requirements. At the same time, strict monitoring and management are also important means to ensure the stability of shoe mold quality.
