Series production is a method of production organization in which a specific number of identical products are manufactured in so-called batches or lots. The entire process is designed to be repeated at fixed intervals. This means: A company does not produce a single unique item (one-off production) nor does it produce the same product continuously for years (mass production), but instead manufactures a precisely defined quantity before the system is prepared for another product following validated cleaning and sterilization processes (CIP/SIP).
At its core, series production stands for the efficient duplication of a product. All items within a series are identical in construction and are manufactured under the same conditions. Flexibility is typical for this process: As soon as a series is completed, production can be adjusted – for example, to realize different filling volumes (SVP/LVP) or different active ingredient concentrations. This mixture of standardization and adaptability makes series production the backbone of modern industry, from furniture manufacturing to pharmaceuticals.
What distinguishes series production from other types of production?
Series manufacturing is a duplication or multiple production process that counts as an intermediate stage between one-off and mass production. This manufacturing, which is often carried out as make-to-stock, but in the field of contract filling (CDMO) usually as make-to-order, aims to make goods available according to expected sales.
Manufacturing for stock guarantees delivery readiness, which is essential especially for pharmaceutical products. Series production covers the potentially high demand for medical products, while quality in terms of patient safety remains consistently high through standardized processes.
What is the difference to grade production?
Grade production is a sub-type of series production. In aseptic filling, grade production often corresponds to the production of different active ingredient strengths or flavors in identical containers on the same system. In contrast, in general series production, the products are mostly identical across all characteristics.
What is lot production?
The lot refers to the totality of the units produced in series that were manufactured under exactly the same conditions. The term is often used synonymously with series production, whereby the lot size determines the efficiency of the setup costs.
Which aspects are explicitly important for application in the pharmaceutical industry?
In the pharmaceutical industry, series production is a highly regulated process for manufacturing defined batches:
- The quantity is limited in contrast to mass production.
- The focus is on perfect quality and sterile safety.
- The origin of the products can be traced beyond doubt.
- The process is subject to GMP (Good Manufacturing Practice) guidelines.
A decisive advantage of BFS technology is the elimination of separate packaging sterilization, as the container is formed directly from the plastic melt and filled immediately.
The process includes raw material procurement, formulation, and aseptic filling. In blow-fill-seal technology, primary packaging takes place simultaneously with filling. To minimize contamination risks, highly automated systems are used. To ensure quality, a 100% inspection is prescribed according to EU-GMP Annex 1. Here, Automated Optical Inspection (AOI) systems and integrity tests (CCI) are used before secondary packaging takes place.
Which processes exist?
- Batch production: Manufacture of a fixed quantity (batch) in a closed process.
- Continuous manufacturing: Constant material flow, whereby release nevertheless occurs in defined units.
- Grade production: Manufacture of similar products (e.g., different active ingredient strengths) on the same system.
- Packaging series production: Independent packaging of the finished dosage forms.
Advantages and disadvantages of series manufacturing
Advantages:
- Good quality control: Established testing procedures such as AOI enable close monitoring.
- Precise traceability: Each unit is assigned to a production lot.
- Efficiency: Reduction of unit costs through economies of scale.
- Risk minimization: In case of defects, the damage can often be limited to the affected batch.
Disadvantages:
- Time loss due to downtime: Setup times for cleaning and sterilization (CIP/SIP) occur between series.
- High inventory levels: Necessary to ensure delivery capability between intervals.
- Lead times: The time from the start of production to the completion of an entire lot can be comparatively long.