There are two types of multi-station press machine:

1. Single Feed System: This type of machine has-

-One hopper

-One discharge chute

This type of compression machine compresses one tablet by an individual punch in a complete round. If a single hopper compression machine having 33 punches compresses 33 tablets in a round.

2. Double Feed System: This type of machine has-

-Two hopper

-Two discharge chute

This type of compression machine, two tablets are compressed by each punch in the complete round. If a double hopper compression machine having 33 punches, 66 tablets are compressed in a complete round.

To calculate the capacity of the compression machine following parameters are required,

• Number of punches

• Revolution per minute (rpm)

• Number of feed system

**Number Of Punches:** Some general types of compression machine on basis of the number of punches are

• 17 Punch Compression machine

• 19 Punch Compression machine

• 23 Punch Compression machine

• 33 Punch Compression machine

• 37 Punch Compression machine

**Revolution per minute (rpm)**

- Revolutions per minute is the speed of the compression machine in one minute.
- Revolution per minute is the measure of rounds completed by a turret of a compression machine in one minute.
- Fast running machine’s rpm is calculated by the Teko meter.

**Number of feed system **

- Single hopper machines are single feeding machines.
- Double hopper machines are double feeding system machines.

The following formula is used to calculate the compression machine capacity.

**Per Minute **

Machine Capacity = Number of punches × rpm × Number of feed system

**Per Hour **

Machine Capacity = Number of Punches×rpm×Number of feed system×60

Suppose we have a compression machine having 35 punches and running at 30 rpm. The machine has a double feed system and capacity is calculated by putting values in the formula as follows,

Number of punches × rpm × Number of feed system

35×30×2=2100 Tablets/min

It means 2100 tablets are compressed in one minute.

For one hour multiply it by 60 and answer is as follow

2100 × 60 = 126000 tablets/hr

It means 126000 tablets are compressed in one hour.

**Read also:** Hopper Capacity Calculation in Pharmaceutical Industry

**But in the Multi-Tip Punch System** we follow the same formula and multiply to the Number of Tips per Punch)

**Look the Formula -**

Machine Capacity = Number of Punches × rpm × Number of feed system × Number of Tips per Punch × 60

e.g.,

Let's say we have a machine with:

• 33 Stations (Punches)

• 6 Tips per Punch (Multi-tip)

• 80 rpm

• Single Feed System (1 Tablet per cycle)

Tablet Output =

33 x 80 x 1 x 6 x 60 = 950400

**How to calculate the capacity of Tablet Press Machine that produces Bi-layer Tablet?**

This machine has 2 Feed system but 1 Discharge chute. So each punch produce 1 Tablet per cycle.

Therefore, it is treated as a Single Feed System Machine.

**Read also:** Dwell Time Calculation Formula

**Resource Person:** Galal Allam Ghazi

Very informative.

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