Pharmaceutical

The pharmaceutical industry's core requirements extend far beyond physical mixing, focusing instead on addressing critical pharmaceutical challenges such as drug delivery, dose uniformity, and enhanced stability through precisely controlled continuous processes. Core components must meet the highest standards of pharmaceutical equipment regarding material compliance, process validation, ultra-high cleanliness, and the accuracy and reproducibility of process parameter control.

Process Characteristics: The pharmaceutical and nutraceutical industries impose requirements centered on compliance, precision, and safety on twin-screw extrusion, with standards significantly exceeding those in general industrial applications.The industry must strictly adhere to cGMP guidelines and comply with FDA regulations. The core objective is to achieve precise dosing, gentle processing, efficient dispersion, and absolute contamination control of high-value, and in some cases highly active or poorly soluble pharmaceutical ingredients within continuous production processes. Typical applications include hot-melt extrusion (HME) for solid dispersions, wet granulation, and continuous production of specialized pharmaceuticals such as transdermal patches.

Core Component Requirements:

Screw element:

The design of screw elements is critical for ensuring efficient mixing and absolute cleanliness. Their configurations provide excellent distributive and dispersive mixing to uniformly disperse APIs within polymer carriers, thereby enhancing the bioavailability of poorly soluble drugs. Co-rotating self-cleaning screw profiles are mandatory, effectively eliminating material dead zones, preventing cross-contamination, and enabling rapid product changeover. Materials must be pharmacopeia-compliant stainless steel (e.g., 316L), with high-grade polished contact surfaces, typically Ra ≤ 0.8 µm. For certain corrosive or highly abrasive formulations, special alloys or coatings may be required. Modular screw designs allow flexible configuration according to specific formulations to optimize shear and conveying performance.

Screw shaft:

The screw shaft forms the foundation for stable operation in continuous, high-torque processes. To enable gentle processing and prevent API degradation caused by overheating, the extruder operates at high specific torque levels,up to 18 Nm/cm³, which places extreme demands on the torsional rigidity and strength of the screw shaft. High machining accuracy and excellent dynamic balance support screw speeds of up to 1,200 rpm while ensuring smooth, vibration-free operation, which is critical for dosing accuracy and process consistency. Material selection and structural design also provide outstanding fatigue strength and corrosion resistance during long-term operation as well as throughout CIP/SIP cleaning and sterilization procedures.

Screw barrel:

As a closed, GMP-compliant "process reactor," compliant with GMP requirements, the barrel presents the most comprehensive and stringent design criteria. It features a modular design that allows flexible assembly according to process needs—such as multi-point, multi-phase feeding, melting, reaction, and vacuum devolatilization—enabling a customized L/D ratio. All product-contact parts are made of high-grade stainless steel with mirror-polished inner surfaces, designed to be dead-zone-free and fully disassemblable to meet rigorous cleaning and validation requirements. A multi-zone, fast-responding, independent temperature control system is essential for precise process control and protection of heat-sensitive APIs. Additionally, the barrel integrates high-vacuum vent ports to remove moisture and volatiles, enhancing product stability, with design and sealing meeting strict containment standards.