In the production process of large-volume injections, the sterilization link is the core barrier to ensuring product quality and patient medication safety, and temperature uniformity is the key evaluation criterion for sterilization effect. China’s “Good Manufacturing Practice for Drugs (GMP)” Appendix on Aseptic Drugs clearly requires that the sterilization process must ensure that all parts of the loading method can achieve the expected sterilization effect. The industry’s general sterility assurance level (SAL) requires SAL ≤ 10⁻⁶, meaning the probability of viable microorganisms existing in the sterilized products is no more than one in a million. Currently, most water bath sterilizers on the market adopt a single top-spray design. For large-capacity sterilization needs such as 5.0 cubic meters, it is often difficult to avoid problems such as temperature dead zones and uneven spraying. Our newly launched 5.0 cubic meter top+side dual-spray water bath sterilizer integrates the advantages of both spraying methods, accurately solves this industry pain point, and provides a more stable, efficient and compliant solution for large-volume injection sterilization through dual-spray technology innovation.

The core principle of a water bath sterilizer is to use superheated water as the sterilization medium, heat and warm the sterilized drugs through spraying, denature microbial proteins, and thus achieve the sterilization effect. It is widely applicable to the sterilization of various large-volume injection products such as glass bottles and soft bags. Although the traditional single top-spray design is simple in structure, its spraying direction is from top to bottom. Blocked by the stacking of large-volume injection bottles/bags, it is easy to form spraying blind spots in the middle and bottom of the cabinet, leading to temperature differences in the sterilization chamber exceeding the standard range (the temperature difference requirement for large-volume injection sterilization is ≤ 1℃). This results in local incomplete sterilization or over-sterilization—microorganisms in the blind spots cannot be effectively killed, posing potential safety hazards, while over-sterilized areas may cause degradation of drug components and reduction of potency, affecting the stability of product quality. Especially for large-capacity sterilization scenarios such as 5.0 cubic meters, with larger loading capacity and more stacking layers, the uniformity shortcoming of the single top-spray is more prominent, making it difficult to meet the compliance and stability requirements in large-scale production.

To address this industry pain point, we have deeply focused on the needs of large-volume injection sterilization scenarios, upgraded the spray structure of the 5.0 cubic meter water bath sterilizer, and adopted a dual-spray design of top spray + bilateral symmetric spray, integrating the advantages of both spray methods to fundamentally solve the problem of temperature uniformity. Compared with the traditional single top-spray, our dual-spray design has three core advantages, which are accurately adapted to the needs of large-scale sterilization of large-volume injections:

First, the dual-spray achieves full coverage without dead zones, resulting in more uniform temperature distribution. We have installed high-pressure spray nozzles on the top of the sterilizer to achieve full coverage from top to bottom, and at the same time, evenly arranged multiple groups of spray nozzles on both sides of the chamber, adopting a horizontal spray method. The two work together to form an all-round three-dimensional spray network—the top spray is responsible for the overall temperature rise of the chamber and covers the upper loading area, while the bilateral spray penetrates the gaps between the stacked large-volume injections, focusing on solving the spray blind spots in the middle and bottom, and completely eliminating the temperature difference caused by blockage in a single spray. After repeated tests and verifications, the temperature difference at each point in the chamber of this 5.0 cubic meter dual-spray sterilizer can be strictly controlled within ±0.8℃ under full load, which is far superior to the industry standard. It ensures that every large-volume injection can complete sterilization in the same temperature environment, avoiding the risk of incomplete sterilization and preventing the damage to drug quality caused by over-sterilization, perfectly complying with the core requirements of GMP for sterilization process verification.

Second, the spray pressure is coordinately regulated, resulting in higher heat transfer efficiency. The dual-spray design is equipped with an independent pressure boosting system, which can accurately adjust the pressure of the top and bilateral sprays respectively, ensuring that the spray water flow acts on the surface of each large-volume injection product uniformly and stably. This makes the high-temperature circulating water fully contact the surface of the bottles/bags, accelerating the heat transfer speed and shortening the sterilization cycle. Compared with the pressure attenuation of the single top-spray water flow from top to bottom, the coordinated work of the dual-spray can make the water flow circulation in the chamber smoother, which not only can quickly increase the overall temperature, but also maintain the temperature stability during the heat preservation stage. While greatly improving the sterilization efficiency, it reduces energy consumption—through the circulating water recovery system, the condensed water generated during the heating process can be directly recovered, further reducing energy waste and meeting the dual needs of high efficiency and energy saving.

Third, it is suitable for large-capacity loading and fits large-scale production. The 5.0 cubic meter chamber design can meet the loading needs of large-scale production of large-volume injections, and the optimization of the dual-spray structure has reasonably improved the space utilization rate of the chamber. It can be adapted to various packaging forms of large-volume injections such as glass bottles, plastic bottles and soft bags, without frequent adjustment of the loading method, and is suitable for the needs of different production batches. At the same time,the equipment is equipped with PLC + HMI + recorder + needle printer, which can real-time monitor key parameters such as temperature and pressure in the chamber, automatically adjust the pressure and water temperature of the dual-spray, realize automatic and intelligent control of the sterilization process, reduce manual operation errors, ensure the consistency of each batch of sterilized products, and reduce production control costs.

As an enterprise focusing on the R&D and production of sterilization equipment, we have always been guided by industry needs, focused on the core pain points of large-volume injection sterilization, and repeatedly polished the equipment details relying on mature technical accumulation. This 5.0 cubic meter top+side dual-spray water bath sterilizer not only achieves a breakthrough in temperature uniformity, but also is fully upgraded in terms of compliance, energy saving and intelligence. The key components such as the equipment chamber and pipelines are made of stainless steel, and the circulating water is indirectly heated and cooled through a plate heat exchanger to ensure that the circulating water is in an aseptic state, avoiding secondary pollution. The surface of the sterilized products is clean and free of residues, further ensuring product quality and safety.

The sterility level of large-volume injections is directly related to patient medication safety. Choosing a sterilization equipment with uniform temperature and stable performance is the key for pharmaceutical enterprises to achieve compliant production and improve product competitiveness. Our 5.0 cubic meter top+side dual-spray water bath sterilizer breaks the limitation of traditional single spray through dual-spray technology innovation, perfectly solves the problem of temperature uniformity in large-capacity large-volume injection sterilization, not only meets the requirements of GMP sterilization process verification, but also can adapt to the efficient needs of large-scale production, providing a more reliable and efficient sterilization solution for pharmaceutical enterprises.

In the future, we will continue to deeply cultivate the field of sterilization equipment, continuously optimize product performance in combination with industry new regulations and technical trends, launch more high-quality equipment that meets industry needs, help pharmaceutical enterprises achieve the upgrade of aseptic production, and guard the safety and quality of every large-volume injection.