Roll presses work by using rotating rolls to compress materials, whether they are powders, raw materials, or large workpieces, into desired shapes or forms. The process involves several key components and steps:
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Pre-Compression and Main Compression Rollers: These rollers are crucial in the tablet-making process. Pre-compression rollers initially compress the material to remove air from the die cavity, ensuring a denser final product. Main compression rollers apply the final force to form the tablets, maintaining a steady pressure to ensure uniformity and quality.
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Ejection Cam and Take-Off Blade: After compression, the ejection cam pushes the bottom punches upwards, ejecting the finished tablets from the die cavity. The take-off blade then guides these tablets into the discharge chute, which directs them out of the press for collection.
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Roll Compaction and Powder Extrusion: In roll compaction, powders are fed into a gap between two rotating rolls, compacted into a sheet, and then sintered in a furnace. This process can be repeated for enhanced material properties. Powder extrusion, on the other hand, involves placing powders in a sealed container and extruding it to form parts with specific dimensions.
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Two Roll Mill: In this setup, raw materials and additives are placed between two rolls that rotate, drawing the materials into the roll gap. Here, they undergo intensive squeezing and shearing, increasing the contact area and dispersing the components evenly. This process continues until the desired material state is achieved.
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Eccentric Shaft and Pneumatic Control: The eccentric shaft in roll pressing systems allows for precise control of the gap between the rolls, multiplying the applied force to achieve high pressures. A pneumatic step motor adjusts the angle of the eccentric shaft, enabling fine adjustments in the gap setting and ensuring accurate and consistent compression.
Overall, roll presses are versatile machines that can handle a variety of materials and applications, from making tablets to compacting powders and extruding metal parts. Their design allows for precise control over the compression process, ensuring high-quality and uniform results.
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