First, high-temperature resistance
Insulation materials need to have excellent high-temperature resistance to withstand the high-temperature environment during the vulcanization process. When the vulcanizing machine is in operation, the temperature is usually quite high. The insulation material should be able to work stably at this temperature for a long time without softening, deforming or decomposing. For instance, some polymer insulation materials may undergo thermal degradation at high temperatures, leading to a decline in insulation performance. Therefore, it is necessary to select inorganic materials with stronger high-temperature resistance or polymer materials that have undergone special treatment.
Second, low thermal conductivity
The core function of insulation materials is to reduce heat transfer, so a low thermal conductivity is a key indicator for selection. The lower the thermal conductivity, the better the heat insulation performance of the material, which can effectively reduce the heat loss during the operation of the vulcanizing machine and improve the energy utilization efficiency. When making a choice, materials with low thermal conductivity should be given priority, such as aerogel felt and ceramic fibers.
Third, chemical stability
During the vulcanization process, various chemical substances may be involved, such as vulcanizing agents and accelerators. Insulation materials need to have good chemical stability and not undergo chemical reactions with these substances. If the chemical stability of the material is poor, it may lead to damage of the insulation layer or contamination of the vulcanization products, affecting the vulcanization effect. Therefore, when choosing insulation materials, their compatibility with the vulcanization system needs to be taken into consideration.
Fourth, mechanical strength and toughness
Thermal insulation materials need to have certain mechanical strength and toughness to withstand the pressure, vibration and possible mechanical shock during the vulcanization process. If the mechanical strength of the material is insufficient, it may cause the insulation layer to crack or fall off, affecting the insulation effect. For instance, some brittle insulation materials are prone to cracking when subjected to external forces. Therefore, materials with certain toughness should be selected, such as reinforced ceramic fiber boards.
Fifth, thickness and density
The thickness and density of insulation materials directly affect their insulation performance. Generally speaking, the thicker the material and the lower its density, the better its heat insulation performance. However, an overly thick insulation layer may increase the overall size and weight of the vulcanizing machine, which is not conducive to operation and maintenance. Therefore, when making a choice, the thickness and density of the insulation material should be reasonably determined based on the specific requirements of the vulcanizing machine and the space limitations.
Sixth, convenience of construction and maintenance
The convenience of construction and maintenance of heat insulation materials is also a factor to be considered when making a choice. Easy-to-construct materials can shorten the installation and commissioning time of the vulcanizing machine and reduce labor costs. Meanwhile, materials that are easy to maintain can reduce the downtime and maintenance costs during the operation of the vulcanizing machine. For instance, some insulation materials adopt a modular design, which is convenient for installation and replacement, and enhances the efficiency of construction and maintenance.
Seventh, environmental protection and safety
Insulation materials should meet environmental protection requirements and not contain harmful substances, such as asbestos and other fibers that are harmful to the human body. Meanwhile, the materials should be non-toxic, odorless and not produce harmful gases during use to ensure the health and safety of the operators. When making a choice, it is necessary to pay attention to the environmental protection certification and safety assessment of the materials.