How to Formulate Stable Multi-API ODFs — Challenges and Engineering Solutions

Going beyond simple ODFs: How to design and produce advanced multi-ingredient films.

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Challenges in Multi-Ingredient Film Formulation

Developing ODFs with two or more active ingredients (APIs) introduces formulation complexity beyond basic mono-layer films. Common issues include:

• Incompatibility between APIs or excipients
• Migration or separation during drying
• Weak bonding between layers in dual-action films
• Delamination due to drying or film tension inconsistency

Engineering Solutions from the Ground Up

At HUANGHAI, we combine formulation expertise with precision equipment design to solve these problems systematically:

• Real-world drying: Our drying tunnel uses a natural hot-air gradient — hotter near the inlet, cooler at the exit — to enable progressive solvent removal and reduce layer separation.
• Multi-layer coating design: Optional multi-head coaters and tension control ensure consistent thickness and inter-layer bonding.
• Pilot testing: Validate formulations using the MJ150-L before scaling to industrial lines.
• Joint R&D: Our team works with you on excipient screening and drying temperature calibration to match product and process goals.

 

Recommended Equipment

Explore ODF coating systems compatible with multi-API production:

• MJ150-L Pilot Coater
• MJ150 Industrial Coater
• MJF180 Cutter & Packer

*Features Huanghai's exclusive patented hot-air drying technology (Patent No. CN201668734U) ensuring uniform bottom-up heating.

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Frequently Asked Questions

Q: What is the difference between an ODF film and a transdermal patch?

A: Oral Dissolving Films (ODF) are placed on or under the tongue and dissolve within seconds to minutes, delivering APIs directly through the oral mucosa or via swallowing. Transdermal patches adhere to the skin and deliver APIs through the dermal layers into systemic circulation over hours to days. Despite different delivery routes, both are manufactured using similar solvent-cast film coating processes. Huanghai's MJ150 ODF machine supports both applications on a single platform with approximately 2 working days of changeover time.

Q: What production output can I expect from a Huanghai ODF machine?

A: The MJ150 produces 20,000 films/hour at commercial scale. The MJ150-L targets R&D and pilot production at 8,000–10,000 films/hour. For fully integrated lines, pair either machine with the MJF180 automatic cutting and packaging system (11,900 films/hr) or the more affordable EZ320 (9,000 films/hr). A complete MJ150 + MJF180 line can produce over 150 million finished pouches annually on a single-shift basis. Contact us for pricing and configuration details.

Q: What drying technology does Huanghai use for ODF production?

A: Huanghai uses patented gradient hot-air drying (Patent CN201668734U), which applies a smooth progressive temperature drop rather than stepwise oven zones used by competitors. This results in more uniform film thickness, reduced edge curl, and better API distribution across the film web. An optional far-infrared heating module adds 20–30% drying efficiency for solvent-based formulations. This patented drying system is one of the key technical advantages that justifies Huanghai's position as the preferred ODF equipment supplier to Sinopharm, Shanghai Pharma, and Fosun Pharma.

Q: What are the GMP requirements for ODF production equipment?

A: ODF manufacturing equipment must comply with cGMP (21 CFR Parts 210/211) for US market products, and equivalent standards (EU GMP Annex 1, ChGMP) for other markets. Key requirements: material contact surfaces must be 316L stainless steel or equivalent; CIP/SIP capability or documented cleaning validation; data integrity controls meeting ALCOA+ principles (audit trails, access control). Huanghai ODF machines meet these standards—all product contact surfaces use pharmaceutical-grade materials, and the control system includes operator access logs and parameter change records. Request our GMP compliance documentation.

Q: Can Huanghai machines produce stripe-coated or multi-formula ODF films?

A: Yes. Huanghai holds a patent for multi-formula stripe coating (Patent CN117323228A), enabling two different API formulations to be applied side-by-side in a single coating pass. This eliminates the need for multiple coating/drying cycles when producing combination-drug ODF products. Competitors require manual multi-layer coating with drying intervals between each formula. This capability is particularly valuable for fixed-dose combination products (e.g., dual-API ODFs for cardiovascular or CNS indications) where coating efficiency directly impacts production economics.