Rubber and plastic vulcanization equipment is an important production equipment in the rubber and plastic industry, including vulcanizing machines, injection molding machines, extruders and calenders, and cartridge heaters are the core heating components of these equipment. The rubber and plastic vulcanization process requires long-term high-temperature heating and uniform temperature distribution, which puts forward high requirements for the high-temperature resistance, heating uniformity and service life of cartridge heaters. Choosing a professional heater suitable for vulcanization equipment is the key to ensuring the quality of rubber and plastic products and improving production efficiency.
The primary requirement of rubber and plastic vulcanization equipment for cartridge heaters is excellent high-temperature resistance. The vulcanization temperature of rubber is generally 150-250℃, and the processing temperature of engineering plastics is higher, up to 350-450℃. The heater needs to operate stably at high temperature for a long time without oxidation, deformation and performance attenuation. Therefore, the sheath of the vulcanization heater is made of 304 or 316 stainless steel with high temperature resistance, and the high-temperature model can choose Incoloy alloy, which can withstand a long-term working temperature of 650℃. The internal resistance wire uses high-quality nickel-chromium alloy with high melting point and good oxidation resistance, and the insulation material uses high-purity magnesium oxide with high temperature resistance, ensuring stable performance under long-term high-temperature operation.
Uniform heating is another core requirement of rubber and plastic vulcanization for cartridge heaters. Uneven temperature of the vulcanization mold or barrel will lead to uneven vulcanization of rubber and plastic materials, resulting in product defects such as hard spots, bubbles, poor elasticity and dimensional deviation. To ensure uniform heating, the heater adopts a precise resistance wire winding process, with consistent watt density per unit area, no local high temperature or low temperature. For large-scale vulcanization molds, multiple heaters are arranged evenly according to the mold structure to ensure that the temperature difference of the entire heating surface is controlled within ±2℃, so that the materials are heated evenly and the product quality is stable.
In addition, the cartridge heaters for vulcanization equipment have good anti-vibration and anti-fatigue performance. Vulcanization equipment will produce mechanical vibration during operation, and the frequent opening and closing of the mold will also bring impact. The heater adopts a compact pressing process, the internal insulation material is highly compacted, and the resistance wire is fixed firmly, which can resist long-term vibration and impact without internal displacement and short circuit. The lead wire is made of high-temperature resistant and flexible material, with a reinforced root, which is not easy to break due to vibration, ensuring the stability of the circuit.
The sealing performance of the heater is also very important in rubber and plastic processing. During the vulcanization process, the material will release volatile gases and oil, which will corrode the heater and affect its service life if entering the interior. The vulcanization heater adopts a fully sealed end structure, which prevents the entry of volatile substances and oil, avoids internal corrosion and insulation damage, and extends the service life. Regular cleaning of the heater surface oil and debris can further ensure its heating efficiency and service life.
In the rubber and plastic industry, the stability of the heater directly affects the production efficiency and product qualification rate. A high-quality vulcanization cartridge heater can operate stably for more than 8000 hours, reducing the frequency of replacement and maintenance, and avoiding production losses caused by equipment shutdown. With the continuous upgrading of rubber and plastic products, the demand for high-performance cartridge heaters for vulcanization equipment is also increasing, and customized heaters with high temperature resistance, uniform heating and long life have become the first choice of enterprises.
