СATALOGUE / PHARMACEUTICAL PRODUCTION TECHNOLOGIES / BASICS OF PRESSING POWDER INTO TABLETS / Pressing stages for powdered materials

Pressing stages for powdered materials

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СATALOGUE / PHARMACEUTICAL PRODUCTION TECHNOLOGIES / BASICS OF PRESSING POWDER INTO TABLETS / Pressing stages for powdered materials

Pressing stages for powdered materials

The whole pressing process is proposed to be divided into three stages: compaction (underpressing); formation of a compact body; volumetric compression of the formed compact body. At the first stage of pressing under the influence of an external force there is convergence and compaction of material particles due to their displacement relative to each other and filling of voids. The forces overcome in this process are insignificant and compaction becomes noticeable already at low pressures. The applied energy is mainly used to overcome internal (between the particles) and external (between the particles and the matrix machines) friction.

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Information updated: 07 / 05 / 2026
Available for
Production: 1 year на оборудование для прессования порошкообразных материалов

Model: Pressing powdered materials

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In reality, there are no sharp boundaries between the three stages of pressing, as the processes occurring in the second stage take place in the first and third stages, and we can only speak about the predominant role of individual processes in each of the pressing stages. Studies have established that the nature of compaction of granules and powder particles during pressing depends on their strength. As mentioned in Sect. 4.4, tablets are produced by three methods: wet granulation, dry granulation and direct pressing.

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Technical specifications

In the second stage of pressing, as the pressing pressure increases, the material is intensively compacted by filling the voids and various types of deformation, which contribute to a more compact packing of the material. The resulting deformations can be of the following types: deformation due to elasticity helps the particles to wedge into each other, which increases the contact surface; deformation due to plastic properties makes the particles change their shape and fit more tightly together; deformation determined by the brittleness of the material, characterized by the destruction of the pressed material, occurs only when the stresses occurring in the pressed material exceed the yield strength of the material.

Additional information

In this case there is a mechanical destruction of material particles into smaller ones, accompanied by a significant increase in surface energy, which creates conditions for the emergence of contacts between particles. At the second stage of pressing a compact porous body with sufficient mechanical strength is formed from the bulk material. At the third stage of pressing at high pressure values, when the mechanical strength of tablets changes insignificantly, there is possibly a volumetric compression of powder particles and granules without a noticeable increase in contact surfaces.

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Samuel
Good afternoon, please confirm that closer to evening we will receive our shipment in Paris? Contact the transportation company. 14/05/2026 21:03

Roman Tsibulsky
Hello Samuel ! Representatives of the transportation company on the delivery status of your shipment said that it will be in Paris in a few days. Please expect it. 14/05/2026 21:07

Natalie
Run through the order. V-shaped mixer for powders VM-50 and Mechanical tablet press PP-28 are waiting. 14/05/2026 21:13

Roman Tsibulsky
Natalie, Checking delivery status. The shipment is already in Bruges warehouse. Please arrange for pickup. 14/05/2026 21:14

James
Dear Roman, good afternoon, vacuum powder conveyors QV-05 in quantity of 4 pieces, already on their way to Antwerp ? 14/05/2026 21:23

Roman Tsibulsky
Good afternoon, James! Our manager has sent a scan of the bill of lading to your email. The shipment is on its way. 14/05/2026 21:27

William
Vacuum lyophilic freeze dryer LG-30, can we get faster than the contract ? 14/05/2026 21:33

Roman Tsibulsky
Hello William, Shipments go through several time stages. Manufacturing, delivery from the factory to the warehouse in Beijing or Shanghai, waiting for batch collection, customs clearance and delivery. It's hard to predict. 14/05/2026 21:37

Harper
Horizontal granulator for organic fertilizers JU-80, the price is up to date ? Delivery time to Tbilisi? Urgent. 14/05/2026 21:43

Roman Tsibulsky
Harper, Please read carefully the description of this model in our catalog. Prices are current. Timing 1-1.5 months. 14/05/2026 21:47

Lily
Please inform me about the status of the order Rotary tablet press RZ-10A in San Diego ? 14/05/2026 21:53

Roman Tsibulsky
Good afternoon, Lily. We have contacted the carrier, delivery is scheduled after lunch. Please let us know when you receive it. Thank you. 14/05/2026 21:55

Chloe
The MZ-10 expiration date and date handheld printer has still not been delivered. The driver did not answer and dropped calls yesterday. 14/05/2026 22:03

Roman Tsibulsky
Hello Chloe, Transportation has advised that In the afternoon driver will definitely deliver the box to your address. We apologize. 14/05/2026 22:04

Chloe
Have you received payment from our company ? When can we expect delivery ? Please specify realistic terms. 14/05/2026 22:13

Roman Tsibulsky
Good afternoon Chloe, You paid a few hours ago. We told you that the delivery time is 30 to 45 days. in the morning we will get a reply from the manufacturer on the final time frame. 14/05/2026 22:15

David
We have sent to info@minipress.ru photos of the damaged box with induction welding membrane machine FG-08. Please call back. 14/05/2026 22:23

Roman Tsibulsky
Good day, David! Damage to the packaging is unfortunately a common practice in transportation. Please carefully unpack the shipment and send us a series of photos. We will take a look and take action. 14/05/2026 22:25

Olivia
Contract #12, the deadline for delivery has already passed. Take action at last. Accelerate Tsibulsky R.G. 14/05/2026 22:33

Roman Tsibulsky
Hello Olivia, we are on vacation on weekends and are not able to respond to messages. Raise the contract, delivery time of equipment to your warehouse in Vienna to 50 working ( not calendar) days. Action taken. 14/05/2026 22:37