Selection of Heating Medium in Injection Molding
Temperature control of the mold is crucial in the injection molding process. It directly affects product quality, such as shrinkage, warping, and surface finish.
Function of Heating Medium
Maintaining Stable Mold Temperature: Ensures rapid cooling and solidification of the molten plastic within the cavity, resulting in products with stable dimensions and a smooth surface.
Improving Production Efficiency: Shortens the molding cycle through rapid cooling.
Enhancing Product Quality: Prevents product defects like warping and shrinkage.
Common Heating Media
1. Water
Advantages: High heat capacity, high thermal conductivity, low cost, and readily available.
Applications: Generally used for molds with lower temperature requirements.
2. Oil
Advantages: Better thermal conductivity than water, less scaling, and extended equipment life.
Applications: Commonly used for molds with higher temperature requirements and longer circulation systems.
3.Heat Transfer Oil
Advantages: Excellent thermal stability, oxidation, and corrosion resistance, with a wide operating temperature range.
Applications: Suitable for high-temperature, high-pressure temperature control systems with high precision temperature control requirements.
Selection Principles for Heating Medium
Mold Material: Different mold materials have varying requirements for the temperature range and corrosion resistance of the heating medium.
Plastic Type: Different plastic types have different temperature requirements, necessitating the selection of a suitable heating medium.
Product Quality Requirements: High-quality products require higher precision temperature control, demanding a heating medium with good thermal stability and precise temperature control.
Economy: Comprehensive consideration of the cost, performance, and service life of the heating medium.
Safety: Selection of non-flammable and non-explosive heating media.
