JPH04333398A - Vacuum tableting method and device for rotary type powder molding machine - Google Patents

Abstract

PURPOSE:To eliminate the adverse conditions at the time of molding, such as capping, laminating by compressing powder under a reduced pressure, thereby molding tablets. CONSTITUTION:A piston cylinder 2 for powder is connected to the bottom end of a hopper 1 existing in the atmosphere and while the powder in the above- mentioned hopper 1 is isolated from the outdoor air by the lateral movement of a piston 6 having an annular groove 5 in the intermediate part by compressed air, the powder is supplied into the machine body. The molded tablet enters the inside of a piston cylinder 13 for tablets connected to the front end of a cylindrical chute 12. This tablet is released into a tablet receiving can 18 while the tablet is isolated from the outdoor air as a piston 17 for tablets having an annular groove 16 in the intermediate part is laterally moved by the compressed air.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum tableting method using a rotary powder molding machine, which is characterized by compressing powder to form tablets under reduced pressure, and an apparatus therefor.

0002

[Prior Art] Conventionally, this type of vacuum tableting device has
A tableting device is housed in a case equipped with a valve such as a rotary valve that intermittently and continuously introduces powder and granules, and a valve that similarly intermittently and continuously discharges tablets. and the inlet valve and the discharge valve are respectively connected to a tableting device so that tabletting is performed in a state where the presence of air and moisture in the container casing is reduced. A continuous tableting device is known (Special Publication Act
(Refer to Publication No.-21489).

0003

[Problems to be Solved by the Invention] Similar to the prior art, the purpose of the present invention is to compress powder under reduced pressure to form a tablet, thereby improving capping, laminating, etc. The present invention aims to provide a vacuum tableting method using a rotary powder molding machine that can eliminate adverse conditions during molding, and an apparatus therefor.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method in which a large number of dies are fitted into a rotary disk, powder is filled into the holes of the dies, and an upper punch and a lower punch are arranged between compression rolls. In a rotary powder molding machine that compresses the powder in the mortar hole to form a tablet each time the powder passes through the mortar, the lower end of the hopper in the atmosphere is connected to a horizontally mounted powder piston cylinder. Both sides are sealed and compressed air is sent from the both sides, and when a piston having an annular groove in the middle moves laterally and the annular groove is positioned outside the lower end of the hopper, outside air is isolated; Connect the pipe at the bottom of the powder piston cylinder to the quantitative feeder, attach the powder sensor to the bottom, connect the intermediate pipe whose upper end is connected to the quantitative feeder to the feeder, and shut off the outside air and the inside of the machine. An inflow circuit for the powder was made, and the tip of the cylindrical chute for taking out the tablet molded product was connected to a tablet piston cylinder mounted horizontally, and both sides of the piston cylinder were sealed, and the powder was injected from both sides. Compressed air is fed into the tablet piston cylinder so that when the tablet piston having an annular groove in the middle moves laterally and the annular groove is located at the tip of the chute, the inside of the machine is isolated from outside air. A tablet receiving can in the atmosphere was installed at the bottom of the machine, and when the pressure inside the machine was reduced using a vacuum pump, outside air was prevented from flowing into the machine, and the powder was compressed to form tablets under reduced pressure. A vacuum tableting method using a rotary powder compacting machine is provided.

[0005] Next, in the present invention, a large number of dies are fitted into a rotary disk, powder is filled into the holes of the dies, and each time the upper punch and the lower punch pass between compression rolls, the powder in the holes is filled. In a rotary powder molding machine that compresses powder to form tablets, a piston cylinder for powder is installed horizontally and connected to the lower end of a hopper in the atmosphere, and compressed air is sent from both sealed sides of the piston cylinder. a compressed air pipe, the piston having an annular groove in its intermediate portion and fitted inside the piston cylinder so as to isolate outside air when the annular groove moves laterally and is located outside the lower end of the hopper; A pipe attached to the bottom of the cylinder, a metering feeder connected to the lower end of the pipe, an intermediate pipe with a powder sensor attached at the bottom attached to the bottom of the metering feeder, and a metering feeder connected to the lower end of the cylinder; A connected feed system, an airtight box designed to isolate the inside of the machine from the outside air, a cylindrical chute for taking out the tablet molded product, a tablet piston cylinder connected to the tip of the cylindrical chute and mounted laterally, A compressed air pipe for feeding compressed air from both sealed sides of the piston cylinder, has an annular groove in the middle, and when the annular groove moves laterally and is located at the tip of the chute, it connects the inside of the aircraft and the outside air. A tablet piston fitted inside the piston cylinder to isolate the tablets, a tablet container placed in the atmosphere at the bottom of the piston cylinder, and a vacuum pipe with one end connected to the airtight box at the other end. Provided is a vacuum tableting device for a rotary powder molding machine, characterized in that it is formed from a connected vacuum pump for reducing pressure inside the machine, and is configured to compress powder and form tablets under reduced pressure. do.

[0006]

[Operation] A vacuum pump reduces the pressure inside the airtight box that isolates the inside of the aircraft from the outside air. A piston cylinder and a piston having an annular groove in the middle are attached to the lower end of the hopper that supplies the powder and the tip of the cylindrical chute that discharges the tablets, respectively, so as to isolate the inside of the machine from the outside air. has been done.

Powder that is intermittently supplied by the piston in the powder piston cylinder is supplied into the mortar hole of the rotary disk through a pipe, quantitative feeder, intermediate pipe, and feedsh; A powder sensor mounted at the bottom of the pipe detects the amount of powder and sends a signal when the powder in the intermediate pipe is low, which activates the piston and the metering motor.

[0008]

[Example] An example will be described with reference to the drawings. In FIGS. 1 and 2, a large number of dies 26 are fitted into a rotary disk 25, and powder is filled into the holes of the dies, and each time the upper punch and the lower punch 27 pass between compression rolls, the powder in the holes is filled. A rotary powder molding machine that compresses powder to form tablets is housed in a sealed box 21 that isolates the inside of the machine from outside air. and,
One end of a vacuum pipe 24 is connected to the sealed box 21, and the pressure inside the machine is reduced by a vacuum pump connected to the other end.

A powder piston cylinder 2 installed horizontally is connected to the lower end of the hopper 1 in the atmosphere, and both sealed sides 3 and 4 of the piston cylinder 2 have compressed air cylinders for feeding compressed air. Air pipes 19 and 20 are provided, and the inside of the piston cylinder 2 has an annular groove 5 in the middle part, and when the annular groove 5 moves laterally and is located outside the lower end of the hopper 1, it separates the outside air. A piston 6 is fitted therein.

A metering feeder 8 is connected to the pipe 7 at the bottom of the powder piston cylinder 2, and a rotating blade 28 in the metering feeder 8 is rotated by a motor 29.

[0011] An intermediate pipe 10 having a powder sensor 9 attached to its lower part is connected below the quantitative feeder 8, and the lower end of the intermediate pipe 10 is connected to a feedsh 11. A stirring blade 30 for filling powder into a mortar hole fitted in the rotary disk 25 is disposed in the feedsh 11.

The powder sensor 9 detects the amount of powder in the intermediate pipe 10 and issues a signal when the amount of powder becomes low.
As a result, the side surface 3 of the powder piston cylinder 2
Compressed air is sent from the compressed air pipe 19 provided in the
The piston 6 is operated to supply the powder to the pipe 7, and at the same time, the motor 29 of the quantitative feeder 8 is operated to drop the powder into the intermediate pipe 10 in fixed quantities by the rotation of the rotary vane 28. There is.

The powder filled in the mortar hole of the rotary disk 25 is compressed into a tablet by the upper and lower punches each time it passes between the compression rolls, and the tablet in the mortar hole is compressed by the lower punch 27. is released onto the rotary disk 25 by the damper 31.
5 into a cylindrical chute 12 located outside.

The chute 12 is sealed from the outside air, and a tablet piston cylinder 13 mounted laterally is connected to the tip thereof, and both side surfaces 14 and 15 of the piston cylinder 13 are sealed. are provided with compressed air pipes 22 and 23 for feeding compressed air, and an annular groove 1 is provided in the middle part inside the piston cylinder 13.
A tablet piston 17 having an annular groove 5 having a diameter of 6 is fitted so that when the annular groove 5 moves laterally and is positioned at the tip of the chute 12, the tablet piston 17 isolates the inside of the machine from the outside air.

A piston 17 for tablets is inserted from the chute 12.
When the appropriate amount of tablets has flowed into the annular groove 16, compressed air is sent from the compressed air pipe 22 to the piston 17.
is moved laterally to release port 32 of tablet piston cylinder 13.
The tablets are discharged into the tablet receiving can 18 which is located in the atmosphere.

In FIG. 1, 33 is a sealed window for inspection, etc. In FIG. 2, 34 and 35 are each a piston.

[0017]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects. That is, by compressing powder to form tablets under reduced pressure, adverse conditions during molding such as capping and lamination can be eliminated.

[0018] The above effects will be explained with reference to an experimental example.
In the powder mixing ratio, 40% of 100 mesh lactose, 50% of Avicel, and 9.5% of Neusilin were mixed, and then 0.5% of stearinsanmagnesium was added and mixed, which was once tableted and coarsely crushed to form slag granules 16 to 30. 50% mesh
, 40-80 mesh 40%, 100 mesh through 10
% coarse granular powder, punch diameter 8 mm, punch surface 12
Table 1 below shows the experimental data obtained by repeating the average of 20 sample tablets compressed under the conditions of R and rotation speed of 40 RPM five times.

[0019]

[Table 1]

In Table 1 above, Experimental Example No. In case of Example No. 1, the tablet breaks when dropped by 1 m, but in case of Experimental Example No.
2 and no. In the case of 3, the tablet will not break even if dropped by 1 m. As is clear from the experimental data shown in Table 1 above, when the height of the lower punch in the die hole is kept constant, increasing the vacuum pressure increases the tablet weight, reduces the capping phenomenon, and reduces the tablet thickness to atmospheric pressure. It can be seen that although the change is larger than that of the tablet inside, there is no significant change in response to the difference in reduced pressure, indicating that the tablet hardness increases and becomes difficult to crack. in this way,
Tablet compression under reduced pressure has been shown to reduce air resistance and make tablets easier to form.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a vacuum tableting method using a rotary powder compacting machine and an apparatus thereof according to the present invention.

FIG. 2 is an enlarged central vertical sectional view of the tablet piston cylinder shown in FIG. 1;

[Explanation of symbols]

1 Hopper 2 Piston cylinder for powder 3 Left side 4 Right side 5 Annular groove 6 Piston 7 Pipe 8　Quantity feeder 9 Powder sensor 10 Intermediate pipe 11 Feedish 12 Tubular chute 13 Piston cylinder for tablets 14 Left side 15 Right side 16 Annular groove 17 Piston for tablets 18 Tablet receiver can 19 Compressed air pipe 20 Compressed air pipe 21 Sealed box 22 Compressed air pipe 23 Compressed air pipe 24 Vacuum pipe 25 Turntable 26 Mortar 27 Lower pestle 28 Rotating vane 29 Motor 30 Stirring blade 31 Damper 32 Discharge port 33 Sealed window 34 Per piston 35 per piston

Claims (2)

[Claims] Claim 1: A large number of dies are fitted into a rotary disk, powder is filled into the holes of the dies, and each time an upper punch and a lower punch pass between compression rolls, the powder in the holes is compressed to form a tablet. In a rotary powder molding machine, the lower end of a hopper in the atmosphere is connected to a horizontally mounted powder piston cylinder, both sides of the piston cylinder are sealed, compressed air is fed from both sides, and the middle A piston having an annular groove in the part thereof is moved laterally so that when the annular groove is located outside the lower end of the hopper, outside air is isolated, and a pipe at the lower part of the powder piston cylinder is connected to a metering supply device; An intermediate pipe with a powder sensor installed at the bottom and the upper end connected to the above quantitative feeder is connected to the feedsh to create a powder inflow circuit that shuts off the outside air and the inside of the machine, while the other is for taking out the tablet molded product. The tip of the cylindrical chute is connected to a tablet piston cylinder mounted horizontally, both sides of the piston cylinder are sealed and compressed air is sent from both sides, and the tablet piston with an annular groove in the middle is connected. When the annular groove is positioned at the tip of the chute by horizontal movement, the inside of the machine is isolated from the outside air, a tablet receiving can in the atmosphere is installed at the bottom of the tablet piston cylinder, and a vacuum pump is installed. A vacuum tableting method using a rotary powder molding machine, characterized in that when the machine body is reduced in pressure, outside air is prevented from flowing into the machine body, and the powder is compressed to form a tablet under reduced pressure. 2. A large number of dies are fitted into a rotary disk, and powder is filled into the dies, and each time the upper and lower punches pass between compression rolls, the powder in the dies is compressed to form tablets. In a rotary powder molding machine for molding, a piston cylinder for powder is attached laterally and connected to the lower end of a hopper in the atmosphere, a compressed air pipe for feeding compressed air from both sealed sides of the piston cylinder, A piston that has an annular groove in the middle and is fitted inside the piston cylinder so as to isolate outside air when the annular groove moves laterally and is located outside the lower end of the hopper; a metered pipe connected to the lower end of the pipe, a metering feeder connected to the lower end of the pipe, an intermediate pipe with a powder sensor attached to the lower part attached below the metering feeder, and a feed shunt connected to the lower end of the intermediate pipe. , an airtight box designed to isolate the inside of the machine from the outside air, a cylindrical chute for taking out the tablet molded product, a piston cylinder for tablets attached horizontally connected to the tip of the cylindrical chute, and a sealed box of the piston cylinder. a compressed air pipe for feeding compressed air from both sides, and an annular groove in the middle part, so that when the annular groove moves laterally and is located at the tip of the chute, the inside of the aircraft is isolated from the outside air. A tablet piston fitted inside the piston cylinder, a tablet container placed in the atmosphere at the bottom of the piston cylinder, and one end of the machine connected to the other end of a vacuum pipe connected to the sealed box. 1. A vacuum tableting device for a rotary powder molding machine, characterized in that it is formed from a vacuum pump for reducing pressure inside the body, and is configured to compress powder and form tablets under reduced pressure.