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NH-100
Karvil
Customizable Design
Designed to meet the demanding requirements of graphite and clay compound blending, the NH-100 Sigma Blade Mixer is Karvil’s optimized solution for pencil lead material production. With a perfect balance of mixing performance, energy efficiency, and process control, this model ensures uniform dispersion and consistent batch quality, even for dense, shear-sensitive formulations. Its precision engineering supports medium-scale production while offering customizable configurations for vacuum, heating, and discharge modes.
The NH-100 model features a total mixing volume of 100 liters and is capable of handling 30 to 70 liters per batch, making it ideal for mid-scale pencil lead compound production. Its dual-speed Sigma blades, operating at 37 rpm (fast) and 21 rpm (slow), generate a high-shear mixing environment that thoroughly kneads graphite, clay, waxes, and binding agents into a cohesive, homogenous mixture.
Powered by a 5.5–11 kW main motor, the NH-100 delivers stable torque throughout the mixing cycle, ensuring even distribution of materials without dead zones. The inverter-controlled blade speed allows fine-tuning based on material viscosity and batch behavior, offering enhanced adaptability and precise control—an essential requirement in modern pencil core compounding processes.
To support various production environments and material sensitivities, all product-contact parts of the NH-100 can be fabricated in SS304 or SS316 stainless steel, available with mirror polishing for improved cleaning and corrosion resistance. For standard applications, durable carbon steel is also available as a cost-effective alternative.
The structural frame is crafted from carbon steel and coated with automotive-grade industrial paint, offering protection against dust, abrasion, and corrosion. This robust construction makes the NH-100 mixer ideal for high-frequency, multi-shift operations in graphite-heavy environments typical of pencil manufacturing plants.
Discharging dense, sticky materials like clay-graphite mixtures can be challenging, but the NH-100 offers two integrated discharge methods to simplify the process:
Hydraulic tilting discharge enables fast and thorough emptying of the mixing chamber, reducing downtime between batches and minimizing waste.
Screw extrusion discharge provides a continuous, controlled output—ideal for feeding extruders or forming dies for pencil lead shaping.
For advanced process control, the NH-100 supports optional vacuum mixing up to -0.096 MPa, effectively removing trapped air from the compound to enhance material density and performance. This vacuum system includes a dedicated pump, metal hose, buffer tank, and vacuum gauge, making it essential for premium pencil lead grades.
The unit also supports heating via 6 kW electric power, which is particularly valuable for maintaining flow consistency or activating binding agents. Additionally, jacketed systems are available for steam (≤0.3 MPa), thermal oil, or water circulation, providing versatile thermal management depending on specific formulation requirements.
Equipped with an independent control panel, the NH-100 delivers intuitive, operator-friendly interaction with all key functions:
Function control switches
Real-time voltage and current display
Inverter-based speed adjustment
Electrical safety through Schneider-brand components and circuit breakers
This smart control system ensures repeatable operation, supports safe handling of volatile materials, and aligns with evolving automation standards in pencil lead manufacturing.
Interested in upgrading your pencil lead mixing process? Karvil’s NH-100 Sigma Blade Mixer offers the performance, flexibility, and durability needed for high-quality compound production. Contact us today to learn more about custom configurations, technical details, or to request a quotation. Let us help you bring precision and consistency to every batch you produce.
Technical Parameters
Pencil Lead Mateial Production
Sigma blade mixers, also known as sigma kneaders or double-arm mixers, are widely used in various industries for mixing and kneading highly viscous materials. In the pencil lead industry, sigma blade mixers are employed for specific applications related to the manufacturing of pencil leads. Here are some of the key applications of sigma blade mixers in the pencil lead industry:
Lead Material Preparation: Pencil leads are typically composed of a mixture of graphite or a similar writing material, binders, and other additives. Sigma blade mixers are used to blend and knead these materials to create a homogenous mixture. The controlled kneading action helps distribute the binders evenly and disperse any additives throughout the lead material.
Consistency in Lead Quality: Sigma blade mixers play a crucial role in ensuring the consistency of pencil lead quality. By carefully controlling the mixing process, manufacturers can produce pencil leads with uniform properties, such as hardness, smoothness, and durability.
High Viscosity Mixing: Pencil lead materials often have high viscosities due to the binders and other ingredients used. Sigma blade mixers are well-suited for mixing and kneading highly viscous materials, ensuring that the lead mixture is thoroughly blended and cohesive.
Heat Control: Some pencil lead manufacturing processes require precise temperature control to optimize the characteristics of the lead material. Sigma blade mixers may have heating or cooling capabilities to maintain the desired temperature during the mixing and kneading process.
Lubrication and Lubricant Mixing: Certain types of pencil leads, such as mechanical pencil leads, may incorporate lubricants to improve writing performance. Sigma blade mixers are used to blend lubricants and other additives with the lead material to enhance writing properties.
Dispersing Additives: When pencil leads incorporate additives like colorants or special performance enhancers, sigma blade mixers can ensure even dispersion of these materials, resulting in consistent coloring or other specific features of the pencil leads.
Batch-to-Batch Consistency: Sigma blade mixers provide precise control over the mixing process, which is essential for maintaining batch-to-batch consistency in the properties and quality of pencil leads.
Cleaning and Maintenance: Sigma blade mixers are designed for easy cleaning and maintenance, minimizing downtime between batches and ensuring the prevention of cross-contamination of different lead formulations.
Why Choose Us
Experience and Expertise: Karvil Machinery may boast a long-standing reputation in the industry, indicating their experience and expertise in designing and manufacturing machinery for various applications, including mixing and processing equipment.
Customization: Karvil Machinery may offer customization options tailored to specific production requirements. For silicone rubber production, this could involve designing sigma mixers with features such as specialized mixing blades, temperature control systems, or vacuum capabilities to meet the precise needs of the process.
Quality and Reliability: Companies may choose Karvil Machinery for their reputation for producing high-quality, reliable equipment. Quality construction and components in their sigma mixers can ensure consistent performance, durability, and minimal downtime during production.
Technical Support and Service: Karvil Machinery may provide comprehensive technical support and after-sales service, including installation, training, maintenance, and troubleshooting assistance. This level of support can be crucial for ensuring optimal operation and maximizing the lifespan of equipment.
Innovation and Technology: Karvil Machinery may invest in research and development to continually improve their equipment, incorporating the latest innovations and technological advancements. This commitment to innovation could result in sigma mixers that offer enhanced efficiency, precision, and functionality for silicone rubber production.
Cost-effectiveness: While prioritizing quality and reliability, Karvil Machinery may also offer competitive pricing for their equipment, providing excellent value for the investment.
Customer Satisfaction and Reputation: Positive reviews, testimonials, and a strong reputation among existing customers can be indicators of Karvil Machinery's commitment to customer satisfaction and the quality of their products and services.
