Efficient solutions supporting freezing and storage operations in bulk drug manufacturing
How is your frozen drug substance moving through the facility?
While freezing performance and storage temperature often receive the most attention, day-to-day efficiency depends on what happens between those steps. Every loading, transfer, and storage activity requires operator involvement, consumes resources, and can introduce process variability or EHS-related challenges.
Every transfer also introduces handling-related product loss risk for frozen bags and bottles containing high-value drug substances. Each additional touchpoint increases the likelihood of accidental drops, container damage and product loss.
Moving frozen drug substances through the cold chain becomes increasingly complex. Small inefficiencies between freezing and storage can accumulate over time, affecting workflows, capacity utilization, and operator workload.
How can freeze-to-store workflows be optimized without expanding facility infrastructure? Or how can manufacturers reduce handling steps while maintaining flexibility for different batch sizes and container formats? This article explores practical solutions for simplifying bulk production freeze and storage operations.
Supporting efficient bulk drug substance freezing and storage operations
The efficiency of cold chain operations is strongly influenced by how easily frozen batches can be transported, stored, and accessed throughout the process. In bulk drug substance manufacturing, additional handling steps increase operator workload, consume resources, and can introduce variability.
The goal is simple: to move drug substance batches through freezing and storage operations with minimal manual intervention and a reduced risk of errors.
The complexity of cold chain operations depends on several factors, including whether batches can be processed as complete units or whether individual single-use bioprocess containers must be handled separately. The latter often requires splitting a batch into multiple containers, creating additional steps for loading, unloading, transportation, and redistribution between freezing and storage operations.
Full-batch operations: keeping freezing and storage aligned
Problems often start when freezing capacity and storage capacity are not aligned.
A batch may fit into a blast freezer, but then needs to be split. It is either distributed across multiple storage freezers or placed differently into walk-in freezers, where space utilization can be even more challenging. This means that operators must unload, redistribute, and transport containers before the product reaches long-term storage. These additional process steps add complexity without contributing value to the overall operation.
One approach to streamlining full-batch processing is to design both freezing and storage capacity around the same size. When the process steps of freezing and storage follow the same batch concept, complete batches can move directly from freezing to storage without redistribution or division.
The combination of RoSS.BLST and RoSS.ULTF is based on this principle by supporting the same handling logic across both operations. Mobile transport dollies can remain loaded throughout the process, helping simplify transfers, reduce manual intervention, and improve workflow continuity.
The result is a simpler workflow with fewer handling steps, reduced risk of deviations, and more efficient use of existing infrastructure. The systems are integrated into a streamlined process and optimized for their intended purpose:
RoSS.BLST: maximizing freezing capacity within limited space
For facilities where space is limited, a compact freezing solution can help increase throughput without requiring facility expansion.
RoSS.BLST was designed for high-capacity controlled freezing of bulk drug substance and supports a wide range of container formats, including single-use bags, protected by RoSS® shells, bottles, trollies, and transport dollies. Its modular loading concept allows manufacturers to adapt configurations and throughput to changing process requirements.
A key advantage is its ability to accomodate 30% more batch volumes than comparable blast freezers while maintaining a relatively small footprint. This enables manufacturers to increase freezing capacity without investing in additional freezing infrastructure or valuable cleanroom space. By maximizing the amount of products that can be frozen within a given area, manufacturers can make more efficient use of existing facilities while maintaining operational flexibility as production demands change.
RoSS.ULTF: storage designed for bulk operations
Many ultra-low temperature storage freezers were originally developed for laboratory samples or small-volume inventory. While highly effective for those applications, they are not always optimized for storing large bulk drug substance batches. Bulk freezing and storage operations place different demands on equipment and facility design.
RoSS.ULTF is designed for high-density storage and flexible loading configurations that accomodate large batches or multiple container formats. Because it follows the same handling philosophy as RoSS.BLST, manufacturers can maintain a consistent workflow from freezing through storage of bulk drug substance batches.
EHS-friendly handling of heavy single-use bioprocess containers
Efficiency is important, but so is safe handling. As container volumes increase, manually handling frozen drug substances becomes more challenging for operators and more prone to error. Taking single-use bags larger than 10 L as an example, their weight can become a limiting factor from an EHS (environment, health, safety) perspective.
Fortunately, solutions are available that improve the handling of bioprocess containers while complementing batch-oriented cold chain operations.
Assisted loading of single-use containers with RoSS.LODR
RoSS.LODR supports operators during the loading and unloading of freezers, for example when frozen bioprocess containers are transferred to storage shelves or moved between process steps. The mobile gripper arm enables ergonomic handling of heavy frozen containers, reducing physical strain on operators and supporting a more controlled and repeatable handling process.
Forklift-compatible trolley handling
For larger operations, mobile trolleys carrying single-use bags and bottles can be moved throughout the facility on wheels. Because RoSS.BLST and RoSS.ULTF are designed to accomodate fully loaded trolleys, they can be transferred into and out of freezers using forklifts.
Instead of moving individual containers one by one, complete rack assemblies can be relocated in a single step. This reduces handling time, simplifies internal logistics, and supports more efficient material movement throughout the facility.
Small improvements between freezing and storage can have a big impact
When freezing, transport, and storage are designed as one connected process, manufacturers can simplify batch handling, reduce operator dependency, and make better use of available infrastructure. Even small improvements between freezing and storage can translate into meaningful gains in efficiency, scalability, and operational consistency. Reducing unnecessary product movement throughout freezing and storage operations therefore supports both operational efficiency and loss prevention.
By reducing unnecessary handling steps and maintaining full-batch movement wherever possible, facilities can streamline cold chain operations and make more effective use of existing assets. The result is a process that is easier to scale, easier to manage, and better aligned with the demands of modern biopharmaceutical manufacturing.
Efficient bulk drug substance freezing & storage
