Ayurvedic and herbal tablet manufacturing is one of the fastest-growing segments in India's pharmaceutical industry. As traditional formulations move from powders and pastes to compressed tablets, manufacturers face unique tooling challenges that do not exist in conventional pharmaceutical production.
This guide addresses the specific problems ayurvedic and herbal formulations cause for tablet dies and punches, and provides practical solutions based on our 40+ years of experience supplying tooling to this industry.
Problem 1 — Sticking and Picking
Herbal extracts are often hygroscopic (they absorb moisture from the air) and contain natural gums, resins, and sticky compounds. These ingredients adhere to punch faces during compression, causing tablets with rough, incomplete surfaces, material building up on punch tips over time, picking in embossed areas, and increasing frequency of press stoppages for cleaning.
Solution: For severely sticky ayurvedic formulations, DLC-coated punches are the most effective solution. The investment pays for itself through reduced downtime, less material waste, and longer intervals between press cleaning. For moderately sticky formulations, chrome-plated punches with mirror-polished tips provide a cost-effective alternative.
Problem 2 — Corrosion
Many ayurvedic ingredients are acidic or contain compounds that corrode standard carbon steel tooling:
- Amla (Indian gooseberry) — highly acidic
- Triphala — contains acidic fruit extracts
- Citrus-based formulations — citric acid corrodes steel
- Fermented preparations (asava, arishta) — acidic compounds
Corrosion causes pitting on punch surfaces, which then causes sticking (creating a vicious cycle), and eventually makes the tooling unusable.
Solution: For formulations with known corrosive ingredients, EMMKAY Special Steel provides the best long-term value. For mildly corrosive formulations, OHNS with CrN coating is a cost-effective alternative.
Critical practice: Clean tooling immediately after every production run. Do not leave herbal residue on tooling overnight — corrosion begins within hours for acidic formulations.
Problem 3 — Weight Variation
Ayurvedic granulations are often less uniform than pharmaceutical granulations due to fibrous plant materials, variable particle size distribution, hygroscopic ingredients absorbing moisture, and natural ingredient variability between batches.
Solution: Use dies with proper bore finish (Ra =0.4—m) for consistent powder flow. Ensure die bore dimensions are within tight tolerance (—0.01mm). Use shallow concave punch tips rather than deep concave — they compress fibrous materials more evenly.
Problem 4 — Capping in High-Fiber Formulations
Ayurvedic formulations containing high-fiber plant materials (isabgol, ashwagandha root powder, shatavari) are prone to capping — the top layer of the tablet separating during or after compression.
Solution: Use beveled-edge punch tips. Ensure proper pre-compression on your press. Consider shallow concave tips instead of flat-faced tips. Ensure die bores are not worn.
Recommended Tooling Specifications for Ayurvedic Tablets
| Application | Material | Coating | Surface Finish |
|---|---|---|---|
| Standard ayurvedic (moderate stickiness, non-corrosive) | OHNS | Chrome plating | Ra =0.2—m |
| Sticky ayurvedic (herbal extracts, hygroscopic) | OHNS or EMMKAY Special Steel | DLC on punch tips | Ra =0.1—m |
| Corrosive ayurvedic (acidic ingredients, amla, triphala) | EMMKAY Special Steel | CrN or DLC | Ra =0.2—m |
| Large ayurvedic tablets (churna tablets, vati over 13mm) | OHNS or HCHC | Chrome or DLC as needed | Ra =0.2—m |
Maintenance Tips Specific to Ayurvedic Tooling
- Clean immediately after every run — herbal residue is more corrosive and sticky than pharmaceutical residue
- Use warm water first — many herbal extracts dissolve better in warm water than in solvents
- Follow with IPA wipe — removes remaining residue and moisture
- Oil immediately — do not let cleaned tooling sit unprotected, even for an hour
- Store in low-humidity environment — herbal residue attracts moisture even after cleaning
- Inspect tips more frequently — ayurvedic formulations cause faster wear than standard pharma
Conclusion
Ayurvedic tablet manufacturing demands tooling that can handle sticky, corrosive, and fibrous formulations. The right combination of material, coating, and surface finish eliminates most production problems and extends tooling life significantly.
EMMKAY INDUSTRIES has been supplying tooling to ayurvedic manufacturers since 1983. Contact us to discuss your specific requirements.