Jiaxinhai Circular Split Die Press, Model 61–70 mm

Overview

The Jiaxinhai Circular Split Die Press (Model 61–70 mm) is a manually operated, precision-engineered laboratory pellet press designed for reproducible sample compaction in analytical sample preparation workflows. It employs a mechanical lever-driven hydraulic system to generate uniform axial pressure across circular split-die assemblies, enabling the formation of flat, dimensionally stable pellets from powdered materials—including spectroscopic standards (e.g., KBr for FTIR), XRF calibration tablets, and pharmaceutical blend samples. Unlike continuous-pressure hydraulic presses, this unit delivers controlled, stepwise force application via calibrated hand-lever actuation—making it especially suitable for low-throughput, high-accuracy applications where operator feedback and process visibility are critical. The split-die architecture allows rapid die removal and pellet ejection without disassembling the entire press frame, significantly reducing turnaround time between preparations.

Key Features

• Mechanically amplified hydraulic system with dual-stage pressure transmission—lever ratio optimized for ergonomic operation and consistent force delivery up to 20 tons (typical maximum working load)
• Interchangeable split-die sets accommodating inner diameters from 61 mm to 70 mm in 1 mm increments; all dies feature hardened stainless-steel construction (AISI 420 equivalent) with mirror-finish internal bore (Ra ≤ 0.2 µm) to minimize powder adhesion and ensure surface uniformity
• Modular die holder with positive alignment pins and torque-limited clamping mechanism to prevent eccentric loading and maintain parallelism between upper and lower punches within ±5 µm tolerance
• Integrated depth-stop adjustment for precise control of pellet thickness (range: 0.5–5.0 mm); calibrated micrometer scale engraved on the main column
• Corrosion-resistant powder-coated steel frame with reinforced base plate (30 mm thick, CNC-machined) for vibration damping and long-term dimensional stability

Sample Compatibility & Compliance

This press accommodates dry, free-flowing, and moderately cohesive powders—including inorganic salts (e.g., KBr, NaCl), metal oxides, geological matrices, and polymer blends—provided particle size distribution falls within D₉₀ < 150 µm and moisture content remains below 0.5 wt%. It is routinely deployed in laboratories adhering to ASTM E1188 (Standard Practice for Preparation of Solid Samples for Spectrochemical Analysis) and ISO 18501 (X-ray fluorescence spectrometry — Preparation of solid pressed-powder pellets). While not certified for GMP manufacturing environments, its design supports GLP-compliant documentation: all operational parameters (die ID, applied load estimate, thickness setting) can be recorded manually in lab notebooks or LIMS-integrated forms. For long-term storage, dies must be cleaned with anhydrous ethanol, dried thoroughly, and coated with a thin film of volatile corrosion inhibitor (e.g., MIL-PRF-16173 Grade 3) prior to placement in desiccated cabinets per ASTM D6648.

Software & Data Management

This is a standalone mechanical instrument with no embedded electronics, firmware, or digital interface. All operational parameters—including die size selection, lever stroke count (proxy for relative pressure), and thickness setting—are manually recorded. No software drivers, cloud connectivity, or data export functions are provided. However, the press is fully compatible with third-party laboratory documentation systems: users may integrate usage logs into electronic lab notebooks (ELN) such as LabArchives or Benchling using standardized templates aligned with ISO/IEC 17025 clause 7.5.2 (Control of records). Audit trails for maintenance (e.g., die polishing frequency, hydraulic fluid replacement) should follow internal SOPs referencing ISO 9001:2015 section 7.1.5.2.

Applications

• FTIR spectroscopy: Preparation of transparent KBr pellets (typically 1–2% sample loading, 10–15 ton compaction force)
• Wavelength-dispersive XRF (WDXRF) and energy-dispersive XRF (EDXRF): Production of homogenous, binder-free pressed pellets from soil, ore, cement, and slag samples
• Pharmaceutical QA/QC: Compaction of placebo or active ingredient blends for hardness and dissolution correlation studies
• Materials science research: Fabrication of ceramic green bodies for sintering trials under controlled green density conditions
• Environmental testing labs: Standardized pelletization of air filter dust or sediment extracts prior to heavy metal analysis by ICP-OES

FAQ

What die sizes are included with the standard configuration?
The base unit ships with one split-die set selected from the 61–70 mm range (user-specified at order). Additional dies are available as optional accessories with traceable calibration certificates.
Is hydraulic oil included? What type is recommended?
No hydraulic fluid is supplied. Use ISO VG 32 mineral-based hydraulic oil meeting DIN 51524 Part 2 (HLP) specifications. Refill volume: 350 mL.
Can this press be used with automated tabletting force monitors?
Not natively—no load cell or analog output port exists. Force estimation relies on lever displacement calibration curves provided in the technical manual.
How often should the split-die surfaces be repolished?
Inspect after every 200 compactions; repolish when surface roughness exceeds Ra > 0.4 µm or visible scoring appears—typically every 500–1000 cycles depending on abrasive content of processed powders.
Does the press comply with CE or UL safety directives?
It is not CE-marked or UL-listed, as it contains no electrical components and falls outside the scope of Machinery Directive 2006/42/EC for non-powered equipment. It meets general mechanical safety principles outlined in ISO 12100.