There are many types of powder tablet press molds according to different classification methods. The following are several common types:

Classification by Shape

Circular Dies

These are relatively common and suitable for preparing round tablets or samples, such as pharmaceutical tablets and round powder tablets for spectral analysis. They feature a simple structure, are easy to manufacture, and provide uniform force during the tableting process, effectively ensuring tablet quality and dimensional accuracy.

Square Dies

They can prepare square samples and are often used in experiments or products with specialized requirements, such as square ceramic tablets and tablets of base materials for certain electronic components. The design and manufacture of square dies require careful consideration of corners to avoid stress concentration during tableting, which can lead to cracking of the sample.

Special Shape Dies

These can be customized to various shapes, such as rings, triangles, and polygons, depending on specific experimental requirements. For example, ring dies can be used to prepare samples with a central hole, suitable for testing radial material properties or for special assembly requirements. Triangular or polygonal dies can be used for specialized experiments, such as studying the performance differences of materials under different shapes.

 

Classification by Material

Steel Molds

Featuring high strength and excellent wear resistance, they can withstand high pressures and are suitable for pressing hard powder materials, such as metal powders and carbide powders. Steel molds have a long service life, but are relatively expensive and difficult to process.

Carbide Molds

Derived from increased hardness and enhanced wear and corrosion resistance, they are particularly suitable for pressing hard, high-purity powder materials and for applications requiring the highest precision. For example, in the electronics industry, when preparing high-precision ceramic substrates, or in the powder metallurgy industry, when producing precision parts, carbide molds can ensure dimensional accuracy and surface quality, but they are relatively expensive.

Plastic Molds

They are lightweight, low-cost, and possess a certain degree of elasticity and flexibility. They are suitable for pressing softer powder materials that do not require high mold hardness, such as certain organic powders and pharmaceutical powders. Plastic molds also offer excellent insulation properties, which may offer unique advantages in certain experimental environments. However, their durability is relatively poor, making them unsuitable for high-pressure, high-wear tableting processes.

 

Classification by Structure

Monolithic Dies

Composed of a single, integrated component, they offer a simple structure, easy processing, and low cost. They are suitable for applications where tablet shape and size requirements are low and production batches are small. However, during tableting, monolithic dies can be difficult to remove, especially for complex or sticky powders.

Combination Dies

They are typically assembled from multiple components, such as the die cavity, core, and indenter. This type of die allows for flexible assembly and replacement of components to meet varying tableting requirements, enhancing its versatility and practicality. For example, by replacing cores or indenters of varying sizes, tablets of varying sizes can be produced. Combination dies also offer advantages in demolding, making it easier to remove compressed tablets from the die. They are suitable for tableting powders of various shapes and sizes and are particularly popular in applications where large production batches require high mold flexibility.