Container mixer for tablet production

Container Mixer PM (Copyright: L.B. Bohle)

In the production of pharmaceutical solids, the homogeneity of powder blends is a central quality requirement. It is crucial that all components of a formulation are mixed evenly and that they can be produced reliably, reproducibly, and in GMP-compliant manner. Against this background, container mixing plays an important role in tablet production, focusing on process safety, flexibility, and gentle product handling.

L.B. Bohle has been developing and manufacturing container mixers for the pharmaceutical industry and related sectors since 1987. The company has installed several thousand systems worldwide. The range extends from compact laboratory mixers to systems with a container capacity of up to 12,000 liters.

Homogeneous mixing of dry powder batches as a central process requirement

The PM container mixers from L.B. Bohle are designed for homogeneous mixing of dry powder batches. A key structural feature is the mixing elements located inside the container lid. They support the mixing process within the container and are directly aimed at distributing the powder batch evenly.

The process can be scaled for volumes from four to 12,000 liters. For production environments with changing batch sizes or different product requirements, mixing containers or container mixers with varying capacities can be used.

Closed process with focus on containment and handling

A significant feature of the system is the fully enclosed mixing operation. Each container is equipped with an inner lid for filling. The closed process is also suitable for containment applications.

From a process engineering perspective, this design is relevant because it organizes mixing within a closed system. Additionally, mixers can also be used as milling stations or for transporting containers from one to another.

Flexibility through different container adaptations

For production facilities with different container formats, the interface between the mixer and container is a key factor. L.B. Bohle highlights the high flexibility achieved through various container adaptations. Both round and rectangular containers can be used, as numerous mounting systems for the mixers are available:

– Standard load arm and clamp
– Mounting spindles on the lifting arm
– Lifting arm with eccentric, force, and hydraulic clamps

This range of mounting systems aims to accommodate different production requirements structurally.

Design of the stationary mixing device

The stationary mixing device comprises several components, including:

– PM housing with load pickup
– integrated electrical control cabinet within the housing, optionally as a separate installation
– separate control panel with 15-inch touch panel
– printer or PDF printing optional
– safety light barrier or laser scanner optional

Process advantages derived from the design

Key advantages include quick product changeovers by replacing the mixing container, as well as convenient and efficient cleaning of the containers. Furthermore, changing the container eliminates the need for cleaning the system itself.

This is particularly relevant for production managers because the container serves as a product-specific process vessel, allowing the mixing system to be prepared for different uses without the core system being the focus of each product change.

Advantages of the PM container mixer:

Capacities from 4 to 12,000 liters
Compact footprint compared to similar mixers
Gentle product handling through low rotational speeds
Long-term performance with minimal maintenance
Fast, simple, and cost-effective installation
Containment equipment available as an option

Application in tablet production and dietary supplements

For professionals and managers in pharmaceutical tablet manufacturing, the combination of homogeneous mixing, closed process, and scalable volume range is particularly relevant. This is especially true where reproducible mixing quality and process-integrated handling are required.

For manufacturers of dietary supplements, container mixing is also of interest from these perspectives: flexibility in container sizes, closed process control, and the ability to accommodate different production requirements through various mounting systems and container configurations are advantages in daily production.