The problem of mismatched cleanliness levels is a fundamental and common defect in the construction of cleanrooms for hollow capsule production lines. As a key carrier for drug packaging, hollow capsules have extremely strict requirements on the cleanliness of the production environment to avoid contamination by dust, microorganisms and other impurities during the production process, which directly affects the quality and safety of subsequent drugs. However, in many cleanroom construction projects, the design stage fails to fully consider the differences in cleanliness requirements of different production processes, leading to mismatched overall cleanliness levels, and bringing great difficulties and economic losses to the later operation and transformation.
Hollow capsule production involves multiple consecutive processes, including glue preparation, glue dipping, drying, cutting, fitting, inner packaging, and other links, and each process has distinct and specific cleanliness requirements. Generally speaking, the overall cleanliness level of the hollow capsule production cleanroom is required to reach Class 100,000 or Class 10,000, while some key core processes that have a direct impact on the capsule shell quality need to achieve local Class 100 cleanliness. Specifically, the inner packaging process, which is the final link of finished product protection, has the highest cleanliness requirement, usually requiring Class 10,000 or even local Class 100, to prevent the finished capsules from being contaminated before leaving the factory; the glue dipping and drying processes, which are related to the forming of the capsule shell, require Class 10,000 cleanliness to ensure the uniformity and purity of the capsule shell; the glue preparation, cutting and fitting processes have relatively moderate requirements, generally meeting Class 100,000 cleanliness; even the auxiliary areas such as material transfer corridors also need to maintain corresponding cleanliness levels to avoid cross-contamination between processes.
The core of the mismatched cleanliness level problem lies in the unreasonable design during the cleanroom construction stage-failing to carry out scientific process zoning according to the different cleanliness requirements of each production link. Many construction projects simply design the entire production workshop as a single cleanliness area for the sake of simplicity in design and construction, ignoring the differences in cleanliness needs between processes. For example, the glue preparation area with more dust and the inner packaging area with high cleanliness requirements are arranged in the same cleanroom without effective isolation; or the local Class 100 cleanliness required for the key forming area is not designed separately, and the entire workshop is uniformly designed as Class 100,000, which directly leads to the inconsistency between the actual cleanliness of each process and the required standard.
This unreasonable design will bring two major prominent problems, and the later transformation is extremely difficult, which will cause long-term adverse effects on the production operation. On the one hand, the overall cleanliness level fails to meet the standard. If the cleanroom is designed as a low-level cleanliness area uniformly, the key processes such as inner packaging and forming that require high cleanliness will be in an environment that does not meet the requirements, resulting in excessive dust and microorganisms in the production environment, which will adhere to the capsule shell, affect the product qualification rate, and even fail to pass GMP certification and on-site inspections, making it impossible to carry out formal production. On the other hand, blind pursuit of high cleanliness levels will lead to excessive energy consumption. If the entire workshop is designed as a high-level cleanliness area (such as Class 10,000 or local Class 100) regardless of the actual needs of each process, the ventilation and air conditioning system will need to maintain a higher air change rate, stricter filtration standards and more stable environmental control for a long time. This will significantly increase the energy consumption of the cleanroom, including high electricity consumption for air conditioning operation, high replacement costs for filtration equipment, and high maintenance costs for the system, greatly increasing the production and operation costs of enterprises.
What is more noteworthy is that the problem of mismatched cleanliness levels is difficult to rectify and transform in the later stage. After the cleanroom construction is completed, the division of functional areas, the layout of ventilation and air conditioning systems, and the setting of airtight isolation structures have been basically fixed. If it is necessary to re-divide the process areas according to the cleanliness requirements, add isolation facilities, or transform the ventilation and air conditioning system to adjust the cleanliness level of local areas, it will not only require a large amount of investment in transformation funds, but also involve the dismantling and reconstruction of existing structures and equipment, which will take a long construction period. During the transformation process, the production line will have to stop operation, resulting in production suspension losses. In addition, the later transformation is often limited by the original design and construction conditions, and it is difficult to achieve the ideal effect of scientific zoning and reasonable cleanliness matching, which may even lead to new problems such as airflow disorder and cross-contamination after transformation.
In summary, the problem of mismatched cleanliness levels in the construction of hollow capsule production cleanrooms is mainly caused by the failure to carry out scientific process zoning according to the different cleanliness requirements of each production link during the design stage. This problem not only leads to the failure of overall cleanliness to meet the standard or excessive energy consumption, but also brings great difficulties and economic losses to the later transformation and production operation. Therefore, in the early design and planning stage of the cleanroom, it is necessary to fully combine the characteristics of each production process of hollow capsules, clarify the cleanliness requirements of each link, carry out scientific and reasonable process zoning and cleanliness level design, ensure that the cleanliness level of each functional area matches its production needs, so as to avoid the occurrence of mismatched problems, ensure the qualification of product quality, and reduce production and operation costs.