Description
The Melt Bolt K-Type Thermocouple is specifically designed for direct temperature measurement of molten plastic in extrusion, injection molding, and polymer processing applications. Unlike standard barrel or bayonet thermocouples that measure the temperature of the machine surface, this sensor is threaded directly into the barrel so that its 4.5 mm sensing tip extends into the molten polymer stream, providing fast, accurate, and representative melt temperature readings.
Manufactured with a K-Type (Chromel-Alumel) thermocouple element, an SS316 stainless steel body, and a 12 mm threaded bolt connection, this thermocouple is engineered for reliable performance in demanding plastic processing environments. Its pressure-tight, leak-resistant construction helps maintain process integrity while delivering accurate temperature measurements from 0°C to +600°C. The Big Omega connector allows quick sensor replacement during maintenance, minimizing production downtime.
The Melt Bolt K-Type Thermocouple is widely used in plastic extrusion machines, injection molding equipment, hot runner systems, polymer processing lines, and extrusion dies, where direct melt temperature monitoring is essential for maintaining product quality, process stability, and consistent material flow. Aavad Instrument Pvt. Ltd. also offers customization of thread size, probe dimensions, connector type, cable length, and thermocouple configuration to meet specific machine and process requirements.
Key Features
-
Direct Immersion Melt Stream Tip ($4.5text{mm}$ OD) Immersion tip penetrates directly into the molten polymer core to track true plastic melt temperatures rather than delayed external heat zone readings.
-
Leak-Proof $12text{mm}$ Threaded Bolt Design Precision-machined SS316 bolt threads directly into standard melt ports on extruders and molding machines, withstanding extreme internal melt pressures.
-
Heavy-Duty SS316 Stainless Steel Construction (0°C to 600°C) Rugged solid metal body resists abrasive filler materials (such as glass fibers or mineral additives) in engineering resins.
-
Big Omega Quick-Disconnect Connector Plug Standardized industrial plug allows rapid detachment during machine teardowns, barrel cleaning, or replacement without rewiring control panels.
-
Armored Flexible Cable (1-Meter FG/FG/SS) High-temperature fiberglass internal conductor insulation protected by an outer stainless steel wire braid guards against high ambient heat and physical chafing.
-
Fast Thermal Response Low thermal mass tip provides immediate signal feedback to prevent resin degradation, burn marks, and melt fracture defects in extruded products.
Applications
-
Plastic Extrusion Lines (Sheet, Film & Pipe) Real-time melt temperature monitoring along extruder barrels, screen changers, and gear pump adapters.
-
Injection Molding Machine Nozzles In-line temperature sensing in injection nozzles and transition zones to optimize shot consistency and resin viscosity.
-
Hot Runner Systems & Manifolds Direct plastic stream control in multi-cavity hot runner dies for automotive and consumer packaging molds.
-
Compounding & Masterbatch Extruders Melt temperature tracking during high-shear compounding of engineering thermoplastics, color concentrates, and recycled polymers.
-
Blow Molding Extruder Heads Continuous temperature control on parison extrusion heads for container and bottle manufacturing.
Datasheet
FAQs
1. What is a Melt Bolt K-Type Thermocouple?
A Melt Bolt K-Type Thermocouple is a K-Type temperature sensor specifically designed to measure the temperature of molten plastic directly inside extrusion and injection molding barrels. It provides accurate melt temperature measurement for improved process control and product quality.
2. Why is Melt Temperature more important than Barrel Temperature?
Barrel temperature indicates the operating condition of the heater, while melt temperature reflects the actual temperature of the molten polymer. Since melt temperature directly affects product quality, material properties, and process consistency, it is the most critical parameter in plastic processing.
3. What industries use Melt Bolt Thermocouples?
Melt Bolt K-Type Thermocouples are widely used in plastic extrusion, injection molding, polymer processing, cable manufacturing, film production, and masterbatch manufacturing, where precise molten polymer temperature monitoring is essential.
4. What is the difference between a Melt Bolt Thermocouple and a Plastic Extruder Thermocouple?
A Melt Bolt Thermocouple measures the temperature of the molten plastic inside the process, while a Plastic Extruder Thermocouple is generally used to monitor the barrel or heater zone temperature. Measuring melt temperature provides a more accurate indication of the actual processing conditions affecting product quality.
