Based on the previous focus on how hot runner overheating can lead to thermal degradation of sensitive materials like PVC/POM, resulting in scrapped injection molded parts and even safety hazards, excessively high hot runner temperatures can cause multi-dimensional and specific problems:
Material Level:Thermosensitive materials like PVC and POM will rapidly degrade, causing molecular chain breakage, resulting in silver streaks and scorch marks on injection molded parts, a sharp drop in mechanical strength, and even brittleness. Some materials may also decompose and release corrosive and toxic gases.
Molding Level: Low melt viscosity leads to flash and overflow, abnormally large cooling shrinkage, product warping and deformation, dimensional deviations, and a significant drop in yield.
Equipment Level: Heating elements and seals age rapidly, significantly shortening equipment lifespan. In severe cases, localized overheating can cause damage to core components.
Production Level: Cooling cycles are forced to lengthen, increasing production energy consumption and reducing mass production efficiency. In severe cases, batch scrapping can occur, resulting in substantial economic losses.
These problems directly impact the stability of injection molding production and product quality, requiring proactive prevention and control measures to avoid overheating.
