Liquid Nitrogen Cryogenic Pulverizer
Liquid Nitrogen Cryogenic Grinder for Plastic and Heat-Sensitive Materials
Item Number: PP-LN06
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Product Overview
This liquid nitrogen cryogenic grinding system provides a cost-effective solution for pulverizing temperature-sensitive, tough, and elastic materials into fine powders. By utilizing the extreme cold of liquid nitrogen to embrittle the feedstock, it achieves high-speed impact grinding without thermal degradation, preserving the original material properties.
The equipment is primarily deployed in quality inspection laboratories, polymer testing facilities, and research institutions for sample preparation and small-batch production. Typical materials include various plastics (PE, PP, PET, PS, PBS, TPU), elastomers, polylactic acid (PLA), paraffin wax, and other heat-sensitive substances.
Designed for continuous operation under demanding laboratory conditions, this unit combines a robust high-speed mill with an integrated liquid nitrogen delivery system. The screenless air classification discharge ensures consistent particle size distribution, while built-in safety features and easy-to-clean components make it a reliable choice for multi-material workflows.
Key Features
- High-Speed Impact Grinding with Cyclonic Collection: The grinding chamber employs a proprietary combination blade set rotating at 22,000 r/min, generating powerful impact and vortex forces that reduce particles to fine sizes instantly. The screenless design with air-flow classification yields uniform results across the 40–300 mesh range.
- Optimized Blade and Seal Set: The mill includes 15 blades of varying geometries and two thicknesses of sealing rings, allowing users to tailor shear and impact actions for different material characteristics—enhancing both efficiency and adaptability.
- Continuous Feeding and Discharge: Unlike batch-type mills, this system supports uninterrupted material flow from hopper to collector, significantly improving throughput (0.3–3 kg/h) and making it suitable for pilot-scale runs.
- Dual-Mode Liquid Nitrogen Control: The cooling system combines a foot-operated liquid nitrogen pump for precise incremental addition and an electric pump for sustained flow. Operators can adjust the injection rate via pedal frequency or valve opening, providing fine control over grinding temperature.
- Quick-Change Collection Components: Both the collection canister and fabric filter bag are fully washable, enabling rapid changeovers between different materials without cross-contamination.
- Safety Interlocks and Overload Protection: The machine is equipped with an overload circuit breaker and a power cut-off switch that activates if the collection canister is removed during operation, guarding against accidental access to moving parts.
- Easy Fineness Adjustment: An internal regulator allows fineness to be tuned by simply loosening or tightening a single screw—no disassembly or tool changes required, saving time when switching between coarse and fine targets.
- Optional Pre-Cooling Basket: A lift-out basket can be placed in the liquid nitrogen dewar to pre-chill raw material batches before feeding, further improving grinding efficiency for particularly tough or elastic samples.
- Versatile Standalone Use: The high-speed mill module can also serve as an independent ultra-fine grinder for ambient-temperature materials, expanding the equipment's utility beyond cryogenic applications.
Applications
| Application | Description | Key Benefit |
|---|---|---|
| Plastic Raw Material Testing | Grinding plastic pellets (PE, PP, PET, PS, etc.) for melt flow index, ash content, or spectroscopic analysis | Fast, uniform particle size reduces sample prep time; cryo-cooling prevents melting |
| Heat-Sensitive Polymer Processing | Pulverizing PLA, PBS, and other biodegradable polymers that soften at low temperatures | Maintains chemical integrity; avoids thermal degradation and oxidation |
| Elastomer and Rubber Sample Preparation | Cryo-grinding of TPU, rubber, and elastic compounds into fine powders for compounding studies | Achieves fine mesh sizes without agglomeration; clean process |
| Paraffin and Wax Milling | Size reduction of paraffin wax and similar low-melting-point solids for additive manufacturing or coating formulations | Prevents smearing; consistent particle distribution |
| Fiber Material Grinding | Processing fibrous materials (e.g., cellulose, plant fibers) that are hard to grind at room temperature | Embrittlement enables efficient fiber breakage; reduced wear on blades |
| Research and Development Laboratories | General-purpose ultra-fine grinding of diverse materials for prototyping or material characterization | High flexibility with adjustable fineness and blade sets; one system, many materials |
| Quality Inspection Stations | Routine sample preparation in QC labs for polymer manufacturers | Reliable, reproducible results with minimal cleaning effort between runs |
| Small-Batch Production | Pilot-scale grinding for specialty chemical or pharmaceutical intermediates | Continuous operation yields up to 3 kg/h, bridging lab and production |
Technical Specifications
The complete PP-LN06 Liquid Nitrogen Cryogenic Grinding System consists of the grinding unit, liquid nitrogen dewar, combined foot/electric pump, and tubing stand. Specifications for the integrated system are listed below.
| Parameter | Specification |
|---|---|
| Model | PP-LN06 |
| Power | 1.8 kW |
| Voltage | 220 V |
| Cryogenic Grinding Fineness | 40–300 mesh |
| Capacity | 0.3–3 kg/h |
| Minimum Sample Size | 10 g |
| Feed/Discharge Type | Continuous |
| Rotational Speed | 22,000 r/min |
| Cooling Medium | Liquid nitrogen |
| Blade Type | Combination blades (15-piece set) |
| Grinding Principle | High-speed impact with vortex |
| Discharge Method | Screenless air classification |
| Liquid Nitrogen System | Foot-operated pump + electric pump |
| Host Weight | 15 kg |
| Safety Precautions | Ensure adequate ventilation and wear cryogenic PPE. |
*All specifications are for the standard configuration. Custom setups can be discussed.
Why Choose This Product
- Proven Engineering for Heavy-Duty Use: The high-speed impact mechanism and robust bearing assembly are designed for continuous operation, providing years of reliable service in demanding lab environments.
- Precision Cryogenic Control: The flexible liquid nitrogen delivery system, combining manual and electric actuation, allows tight temperature management to embrittle materials just enough for efficient grinding without excessive consumption.
- Unmatched Versatility: With a comprehensive blade kit, fast fineness adjustment, and optional pre-cooling, this system handles an exceptionally wide range of materials—from rigid plastics to sticky rubbers—making it indispensable for multi-material labs.
- Easy Maintenance and Sanitation: Tool-free access to the grinding chamber, washable collection parts, and a simple blade change procedure minimize downtime and eliminate cross-contamination risks.
- Safety-First Design: Integrated safety interlocks, overload protection, and enclosed grinding zone protect operators while maintaining consistent performance.
Contact us today to discuss how this liquid nitrogen cryogenic grinding system can be optimized for your specific applications, or to request a quotation for a custom-configured solution.
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