JPH0371995A - Method and apparatus for adjusting weight of forming product in powder compressed forming machine - Google Patents

Abstract

PURPOSE:To enable high accurate weight adjustment by comparing variation of compressive load with the set value to adjust packing powder weight and also correcting the above adjustment based on difference between the average load near at the time of sampling in forming products and the basic load. CONSTITUTION:A load electric converter 7 is connected with a signal treatment device 8 to convert the variation of compressive load in powder forming into the load electric signal. Output terminal in the above device 8 is connected with setters 10-15 at each step and also connected with an operation processor 9. A weigher 21 for measuring the weight of product converts weight variation of the product into the weight electric signal and this is inputted to the processor 9. Comparing operation processing is executed between the above value and the preset electric signal value for the basic weight in the product to operate the weight difference and the decided set value is automatically inputted to the setters 10-15 at each step. By this method, the adjustment of packed powder weight is further made to correct and thus, the quality control is facilitated and the high regulated product can be obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for adjusting the weight of a molded product in a powder compression molding machine for producing molded products such as pharmaceuticals, foods, or electronic parts. , a weight adjustment method that converts the weight of a molded product into a change in compressive load during molding and corrects the amount of filling powder based on the change.The basic method is to sample and weigh the molded product without stopping weight adjustment based on the compressive load. In addition to calculating the difference in weight, the difference between the average load and the basic load in the vicinity at the time of sampling is determined, and the correction of the amount of filling powder is corrected based on these values. The present invention relates to a weight adjustment method and device.

[Prior art] Generally, molded products are produced using a rotary powder compression molding machine or a single-shot powder compression molding machine. The powder is filled in an amount determined by the height of the lower punch inserted into the mold, and the upper and lower punches pass between compression rolls to compression mold.

Molded products such as tablets are required to be homogeneous with little weight change, but it is difficult to continuously produce homogeneous molded products due to the physical properties of the powder and the expansion and contraction of the punch caused by temperature changes. be.

In particular, in recent years, when molded products are pharmaceuticals, extremely strict control has been required since the implementation of the Standards for Manufacturing and Quality Control of Pharmaceuticals (hereinafter referred to as 'GM1').
It is mandatory to manufacture pharmaceuticals of a certain quality, that is, a certain weight, with guaranteed efficacy and safety.

Furthermore, in terms of manufacturing, not only can GMP-compliant management be easily performed, but also highly accurate and reliable weight adjustment that can be operated unmanned at night, for example, is required in terms of manufacturing efficiency.

Therefore, conventionally, we focused on the fact that there is a certain proportional relationship between the weight of the molded product and the compressive load during molding, and adjusted the height of the lower punch based on the change in the compressive load to reduce the amount of powder charged into E. Japanese Patent Publications No. 45-16085 and Japanese Patent Publication No. 57-4.831 disclose methods for automatically adjusting the weight of molded products.
Publication No. 9 and JP-A-Ili'! There is a technique disclosed in Japanese Patent No. 62-137200.

In addition to these weight adjustments, the weight of the sampled molded product is compared with the basic weight using a scale, and depending on the actual weight difference, the electrical signal level input to the setting device is changed or a multi-stage setting device is used. A technique is disclosed in JP-A-55-11 that adjusts the amount of powder to be filled into the die by changing the base value of weight, etc., and adjusts the weight according to the actual weight of the molded product.
It is disclosed in Japanese Patent Application Laid-open No. 3456, Japanese Patent Application Laid-Open No. 165200/1982, and Japanese Patent Application Laid-open No. 6:3-212099.

Furthermore, in addition to these weight adjustments, it is necessary to correct the so-called temperature-related changes in compression pressure, where the punches, compression rolls, etc. expand or contract due to changes in room temperature or the completion of the molding machine, which affects the compression pressure. Weight adjustment is carried out based on the relationship between the basic load, which is the compressive force, and the basic weight, which is the weight, or the relationship between the weighed average weight and the average load at that time, when obtaining a molded product that should be of good quality. The technology is disclosed in JP-A-63-194899 and JP-A-59422.
It is disclosed in Publication No. 00.

Furthermore, in order to correct the change in compression pressure due to temperature, a weight adjustment technique is disclosed in Japanese Patent Laid-Open No. 63252700 in which temperature change is directly detected and correction is made in accordance with the change.

“Problem to be solved by the invention” Among these conventional techniques, only changes in compressive load can a.
There are problems with those that adjust the weight, such as the changing weight of the molded product during continuous molding, which is not reflected in the weight adjustment at all, making it difficult to precisely control the weight according to the basic weight. .

In addition, in cases where the change in weight c'l is taken into account,
Since the weight adjustment is corrected according to the difference between the weighed weight and the basic weight, it is possible to control the weight accurately, but there are factors that change over time in continuous molding, such as changes in room temperature, the molding machine becoming fully ripe, etc. Changes in apparent compressive load due to thermal expansion or contraction of punches, rolls, etc. are not taken into account at all, and the weight is adjusted based on load changes that include factors other than so-called true weight changes, resulting in more accurate weight. Management is required.

In addition, in addition to the remaining weight change, temperature changes over time are taken into account only under certain conditions, and there may be problems with accuracy, or temperature detection may be difficult. These techniques not only have problems such as requiring additional means and making the equipment complicated and expensive, but also
Two A'1. weight measuring devices and 61 weight measuring devices. In some cases, one device operates to adjust the dispensing motor to change the amount of powder to be filled, based on separate judgments. In either case, there is a major drawback in that both devices are in an uncontrolled state in which no heavy-ffl adjustment is performed.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to effectively utilize detected numerical values by using existing devices. By doing so, it is possible to continuously adjust the weight by compression load without requiring special equipment, and to provide a method and device that can adjust the weight of a molded product in a machine with a powder compression allowance that is denser in fa. It is something.

[Means for Solving the Problem] In order to achieve the above object, the present invention! T! In the i-adjustment method, changes in the compression load during compression molding are converted into load electrical signals, and the amount of powder charged into the mortar is adjusted by comparing it with a set value determined on a setting device, and the weight due to the compression load is adjusted. i Sample the molded product a suitable number of times at predetermined intervals without stopping the adjustment, weigh it, calculate the average weight of the molded product, and add the amount of filling powder to the above E] based on the difference between the average weight and the basic weight. In the method for modifying the weight of molded products in a powder compression molding machine, the average load amount in the vicinity of the sampling time is calculated, and the amount of powder filled into the mortar is corrected based on the difference between the average load and the basic load. The present invention is characterized in that it corrects.

A conversion means detects a change in compressive load during compression molding and converts it into a load electrical signal, a setting device is provided with a set value to be compared with the load electrical signal, and the setting device is used to convert the compressive load into an electric signal.
]; a weighing means for calculating the average weight of the molded product by sampling the molded product an appropriate number of times at predetermined time intervals without stopping the weight adjustment by compression load; In a weight adjustment device for a molded product in a powder compression molding machine, which is composed of a calculation means for calculating the difference between The present invention is characterized by comprising a correction means for calculating the amount of load on the C-flat flat, calculating a correction value based on the difference between the average load and the basic cart, and multiplying the correction value by the correction value. There is a weight adjustment device for molded products in powder compression molding machines.

The average load of the above methods and equipment is the compressive load of the molded product applied an appropriate number of times immediately before sampling, or the compressive load of the sampled molded product and the compressive load of the molded product applied an appropriate number of times immediately before sampling, or the compressive load of the sampled molded product applied an appropriate number of times immediately before sampling. It can be calculated from the compressive load of the molded product and the compressive load of the molded product an appropriate number of times immediately before and after sampling.

In addition, the average load P of the sample of weighed molded products is calculated, and the unit type n of the molded product with basic weight W is calculated.

It is possible to calculate a load A corresponding to the amount, calculate a change coefficient using the average weight W, and multiply the reference value or each setting value of the setting device by the coefficient to correct it.

As a method for determining the change coefficient, for example, if (P - P ) x < Wn O, then W ) is 0; if smaller, then or or or (P - P )
If it is larger than n -1n, it can be calculated as follows.If it is smaller, it can be calculated as follows.

Further, the coefficient of the above formula can be calculated by using the basic-1 load Pn instead of P only for the first time of operation and restart.

Furthermore, in the above equation, the load A can be multiplied by a predetermined coefficient of variation E.

This coefficient of variation E takes into account factors that change over time during continuous molding, such as changes in room temperature, heat generation from the molding machine, natural expansion or thermal contraction of punches and rolls, and the properties of the powder relative to temperature and humidity, particle size, etc. The purpose is to provide a load amount per unit weight that is determined based on the actual powder used.

[Function] The present invention takes advantage of the inherent function of ready-made weight adjustments.
By making full use of its functions, it is possible to easily perform more precise weight adjustment, and by reflecting the difference between the basic load and the weighed sampling average load in the correction, changes over time can be adjusted. It works as if it were possible to make a correction that takes more account of the factors.

In other words, the mainstream method of weight adjustment conventionally used is to detect the amount of compressive load during molding, determine the subsequent amount of filling powder based on the change in that value, and then measure the weight to detect the weight of the molded product. , the determination of the amount of filling powder is corrected based on the difference between that value and the basis weight. In addition, weight adjustment can originally detect the basic load of a good molded product, the average load at the time of weighed sampling, the basic weight of a good molded product, the average weight at the time of weighed sampling, etc.

There is a significant difference y7 depending on how the detected numerical value is handled, and as mentioned above, conventionally, the basic! Whereas the difference between the R amount and the average weight is reflected in the correction, or the relationship between the average load and the average weight is reflected in the correction,
According to the present invention, it is possible to grasp factors that change over time, such as expansion and contraction of the pestle.

If you consider the difference between the basic load and the average load when correcting it based on the difference between the basic weight and the average weight, you can simply determine the correction amount equivalent to the load of the weight difference, whereas at the time of sampling The correction amount corresponding to the true load in the relationship between the change in load and the change in weight can be determined.

If the basic load amount is set as the average load at the previous sampling and the basic load amount is updated for each sampling, recent change factors can be grasped, and corrections can be made more in line with the current situation.

[Example] To explain an example of the present invention with reference to the drawings, numeral 4 is a mounting plate (rotary plate in a rotary powder compression molding machine) on which a mortar 3, which is a molding die, is arranged; Lower pestle 5 within 3
The upper part of the mortar 3 is filled with powder material, and the upper punch 2 and the lower punch 5 are inserted into the upper roll 1 and the lower roll 6.
The powder in the mortar 3 is compressed and molded by applying pressure to the top (r) using a pressure mechanism (a).

7 is a load electric converter such as a load cell, and the load electric converter is provided in contact with the support of either the upper roll 1 or the lower roll 6, for example, the upper roll 1, and its output end is , an amplifier, etc., to convert changes in compression load during powder molding into load electrical signals.

The output terminal of this signal processing device 8 is connected to the setting device 10.1 of each stage.
1. ．． 12, 13, 14, and 15, respectively, and is also connected to the arithmetic processing unit 9.

Reference numeral 21 denotes a weighing device for measuring the weight of the compression-molded molded product.The weighing device 21 is connected to the arithmetic processing device 9, and converts the weight change of the molded product into a weight electrical signal, which is then sent to the processing device. 9 is input.

This arithmetic processing unit 9 takes in electrical signals of the molding load ffi in conjunction with temperature changes by a temperature sensor installed indoors or in the molding machine, either arbitrarily or periodically, and calculates the average load P at the time of sampling. The weight signal of the molded product during sampling is taken and the average weight Ek is obtained.
The weight difference is calculated by comparing W with the electric bullet value of the basic weight W of a predetermined appropriate molded product.

Then, an arithmetic processing unit 9 and setters 10, 11, .
12, 13, 1.4.15 are SET! ,2,
3, 4, 5.6, and the respective set values determined above are automatically transmitted to the setters 10, 11 .
12, 13, 14.1.5.

To explain the setting devices at each stage, the setting device 0 is for setting the upper limit of the control limit range, and the setting flh outputted as 5ETI from the /iij processing unit 09 and the signal processing device 8
It compares the output P which is a load electric signal from the molding process, and outputs 0UTI if the output P exceeds the above set value.

The setting device 11 is for setting an upper limit exclusion level,
As above, compare the set value output as 5ET2 and the output P, and if the output P exceeds the above set value, output 0UT2, and if this exceeds the set value consecutively for more than a separately specified number of times, output 0UT3. It is something to do.

The setting device 12 is for setting the start of control on the L eye side, and compares the setting value outputted as 5ET3 and the output P as described above, and if the output P exceeds the above setting value, the setting device 12 sets the start of control on the L eye side.
It outputs 0UT4 when i consecutive times.

The setting device 13 is for setting the start of control on the lower limit side, and compares the set value outputted as 5ET4 from the arithmetic processing device 9 with the output P which is an electric signal of the signal processing device 8, and determines whether this output P is the above-mentioned value. OUT when the set value is exceeded a specified number of times in a row
5 is output.

The setting device 14 is for setting a lower limit exclusion level,
Similarly to the above, the set value output as 5ET5 is compared with the output P, and if the output P exceeds the above set value, 0UT6 is output, and if this exceeds the set value twice in a row, 0UT7 is output. This outputs the following.

The setting device 15 is for setting the lower limit of the control limit range,
As above, compare the setting value outputted as 5ET6 and the output P, and if this output P exceeds the above setting value, 0U
9 above 0UT1 and 0UT8 which output T8
outputs the reason for stopping the machine as a message (display), and outputs the message (display) to the R1 control system to prevent the machine from stopping.

Upper 3I! OUT3 and 0UT7 respectively output R machine stop operation as a message (display), and
This is an output to the l1lltlf control system to stop the machine.

The above 0UT2 and 0UT6 are molded products (products) respectively.
In addition to outputting the reason for exclusion as a message (display),
This is to output to the 1lltIIIi control system in order to avoid eliminating molded products.

The above-mentioned 0UT4 and 0UT5 output the reason for adjusting the filling amount as a message (display), and also adjust the weight of the weight rail etc. that determines the height of the lower punch 5 in order to adjust the amount of powder filled into the mortar 3. ! This is output to the filling amount adjustment system that controls pJ.

the above,? ii) The calculation processing device 9 calculates a predetermined basic load P for an appropriate molded product, that is, a compression load that will yield a molded product with an appropriate thickness and weight of M1 when the temperature and powder properties are normal; A load A corresponding to a unit weight under such conditions is input, and based on these values, a change coefficient K is calculated by a formula selected from the following.

All of these formulas may be input into the arithmetic processing unit 9 in advance and selected as necessary, the formula may be changed as time passes, or only a specific formula may be input and input as necessary. You may try again.

Then, the calculated change coefficient is multiplied to correct the reference value that is the center of the setter of each stage, and the setting value of each stage is automatically set according to the corrected reference value. Alternatively, the vertical control limit values of the setter]2 and the setter 13 may be directly corrected.

Also, the above? The i4g processing device 9 has displays 16, 17.
18, 19.20, and the display 16 shows the average load P.
n, the maximum and minimum loads on the display 17, the average weight Wn on the display 18, the load A per unit weight on the display 19, and the change coefficient on the display 20, which can be displayed, recorded and output.

Note that 26 is a lifting device for the lower roll 6;
is composed of a motor 22, a worm 23, a worm gear 24, and a threaded rod 25, and the rotation of the motor 22 moves the lower roll 6 up and down to change the compression interval between the upper punch 2 and the lower punch 5. When the arithmetic processing unit 9 determines that the reference value needs to be corrected due to a temperature change factor, instead of correcting the reference value, the rotation of the motor 22 is controlled to correspond to the corrected value. The height of the lower roll 6 (the compression interval of the punches) may be modified, and in this case it is desirable because the thickness of the molded product can also be controlled.

Here, the basic load amount is as shown in Table 1,
The basic load compared to the average load P calculated for each sampling to derive the weight difference is a
, b, c, d, and e.

In other words, the basic load includes the initial 1111, which is a theoretical load.
The set basic load Pn and the reset and re-set basic load P determined as appropriate based on powder properties and environmental condition calculations,
There are P and a basic load 1R expressed by P which is considered as the previous sampling average load 0 weight basic load, and a emphasizes a more theoretical appropriate load amount,
b emphasizes changes over time with 8 continuous motions, C emphasizes correction of fluctuations when operation is interrupted, and d increases the initial setting basic load 1) every time the operation is interrupted in order to carry out C diligently. and e is the previous sampling load P
Set the basic load to −1 and reduce the number of changes in the basic load]R
This is what I saw.

Next, in actual compression molding, Table 2 and Table 3 show the cases where weight 1 adjustment is performed by calculating the change coefficient (J) in each of the above equations.
This is explained by:

(Hereinafter in the margin) (Hereinafter in the blank) (Hereinafter in the top white) [Effect of the invention] As shown in below-L, the present invention is capable of numerically determining the change factors such as temperature changes in the weight of the molded product. With the change in compressive load that appears, f
After analyzing the change in the amount of fi, the subsequent compression molding is corrected, and highly accurate weight adjustment can be easily carried out by changing the calculation formula, etc., without the need for a temperature sensor or other special equipment.

In addition, if the changes in the compressive load are updated and evaluated at each sampling as the average load and basic load at the previous sampling, the weight can be adjusted more in line with changes over time. .

Furthermore, by adjusting the weight to achieve a higher lees content, quality control is easy and high-standard products can be provided.Furthermore, due to these improvements in reliability, unmanned operation at night is possible, which improves production efficiency. It has the following effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of main parts, and FIG. 2 is a block diagram showing arithmetic processing. 1... Upper roll, 2... Upper pestle, 3... Mortar, 4...
- Mortar installation 5...Lower punch, 6...Lower roll, 7...Load electrical conversion 8...Signal processing device, 9...Arithmetic processing device, 10.12. '1.3, 14.15...setting device,
16゜18.19.20...Display device, 21...Weigher,...Motor, 23...Worm, 24...Worm 25...Threaded rod. board, vessel, 1 7 2 gear,

Claims (26)

[Claims] (1) In powder compression molding, the change in compression load based on the basic weight of the molded product is converted into a load electrical signal, and the amount of powder charged into the mortar is adjusted by comparing it with the set value determined on the setting device, and Without stopping the weight adjustment by compressive load, the molded product is sampled and weighed an appropriate number of times at predetermined time intervals, the average weight of the molded product is calculated, and the above-mentioned mortar is filled based on the difference between the average weight and the basic weight. In a method for adjusting the weight of a molded product in a powder compression molding machine that corrects the amount of powder, the average load in the vicinity of the sampling time is calculated, and the set value of the setting device is changed based on the difference between the average load and the basic load. A method for adjusting the weight of a molded product in a powder compression molding machine, characterized in that the amount of powder charged into the mortar is corrected by adjusting the amount of powder filled into the mortar. (2) The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 1, wherein the average load is calculated from the compression load of the sampled molded product. (3) The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 1, wherein the average load is calculated by compressing the molded product an appropriate number of times immediately before sampling. (4) The powder compression molding machine according to claim 1, wherein the average load is calculated from the compression load of the sampled molded product and the compression load of the molded product an appropriate number of times immediately before sampling. How to adjust the weight of molded products. (5) Powder compression molding according to claim 1, wherein the average load is calculated from the compression load of the sampled molded product and the compression load of the molded product an appropriate number of times immediately before and after sampling. How to adjust the weight of molded products on a machine. (6) Convert the change in compressive load based on the basic weight W_0 of the molded product in powder molding into a load electrical signal, sample the electrical signal several times as appropriate, calculate the basic load P_0, and use it as a standard for a multi-stage setting device. Based on the reference value, each setting value of the multi-stage setting device is calculated and set, and the load electric signal from subsequent molding is compared with the set value to continuously automatically control the amount of filling powder, etc. At the same time, without stopping the weight adjustment by compressive load, the molded product is sampled and weighed an appropriate number of times at predetermined time intervals, and the average weight W of the molded product is determined.
_n is calculated, and the average weight W_n and the above basic weight W_0 are calculated.
In a method for adjusting the weight of a molded product in a powder compression molding machine in which the reference value of the setting device is corrected in proportion to the difference between the Calculate the load A equivalent to the unit weight of the molded product W_0, and use the basic weight W_0, average weight W_n, sampling average load P_n, and load A equivalent to the unit weight to change the change coefficient at each predetermined time. A method for adjusting the weight of a molded product in a powder compression molding machine, characterized in that the coefficient K is calculated and corrected by multiplying a reference value or each setting value of a setting device. (7) The change coefficient K is K={P_0+A(W_0-W_n)/P_0}×P_
7. The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 6, wherein the weight is determined from the formula n/P_0. (8) The change coefficient K is K={P_n_-_1+A(W_0-W_n)}×P_
7. The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 6, wherein the weight is determined from the formula n/P_n_-_1. (9) If the change coefficient K is (P_n-P_n-1)×(W_n-W_0)>0, change the coefficient K to K={P_n_-_1+A(W_0-W_n)}/P_
Obtained from the formula n_-_1, (P_n-P_n_-_1)
If ×(W_n-W_0)≦0, the coefficient K is K={P_n_-_1+A(W_0-W_n)}/P_
7. The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 6, wherein the weight is determined from the formula n_-_1×P_n/P_n_-_1. (10) The change coefficient K is K=P_n/{P_n_-_1+A(W_n-W_0)
7. The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 6, wherein the weight is determined from the formula: }. (11) If the change coefficient K is (P_n-P_0)×(W_n-W_0)>0, calculate the coefficient K from the formula K={P_0+A(W_0-W_n)}/P_0, and calculate (P_n-P_0)×( W_n−W_0)≦0
In this case, the coefficient K is K={P_0+A(W_0-W_n)}/P_0×P_
7. The method for adjusting the weight of a molded product in a powder compression molding machine according to claim 6, wherein the weight is determined from the formula n/P_0. (12) Molding in the powder compression molding machine according to claim 8, 9 or 10, characterized in that the change coefficient K is changed to P_n_-_1 and uses basic load P_0 for the first time of operation and restart. How to adjust the weight of items. (13) Claims 6, 7, 8, and 9, characterized in that the load A is multiplied by a coefficient of variation E that takes into account factors that change over time.
, 10, 11 or 12, the method for adjusting the weight of a molded product in a powder compression molding machine. (14) A conversion means that detects changes in compression load during compression molding and converts it into a load electric signal, a setting device in which a set value is determined to be compared with the load electric signal, and filling the mortar using the setting device. an adjusting means for controlling the amount of powder; a weighing means for calculating the average weight of the molded product by sampling the molded product an appropriate number of times at predetermined time intervals without stopping the weight adjustment by compression load; In a weight adjustment device for a molded product in a powder compression molding machine, which comprises a calculation means for calculating a difference in weight and determining a correction value for a setting device based on the weight difference, the average load in the vicinity of the sampling time is calculated, Powder compression molding characterized by having means for calculating a coefficient for correcting the correction of the powder filling amount into the mortar based on the difference between the average load and the basic load and changing the setting value of the setting device. Weight adjustment device for molded products in machines. (15) Claim 1, characterized in that the average load is calculated from compressive loads of sampled molded products.
4. A weight adjustment device for a molded product in a powder compression molding machine according to item 4. (16) The weight adjustment device for a molded product in a powder compression molding machine according to claim 14, wherein the average load is calculated by compressing the molded product an appropriate number of times immediately before sampling. (17) Claim 14, characterized in that the average load is calculated from the compressive load of the sampled molded product and the compressive load of the molded product an appropriate number of times immediately before sampling.
A weight adjusting device for a molded product in the powder compression molding machine described above. (18) Powder compression molding according to claim 14, wherein the average load is calculated from the compression load of the sampled molded product and the compression load of the molded product an appropriate number of times immediately before and after sampling. Weight adjustment device for molded products in machines. (19) A conversion means that detects a change in compressive load based on the basic weight W_0 of a molded product in powder molding and converts it into a load electrical signal, and a multistage setting device each having a set value to be compared with the load electrical signal. , an adjustment means that automatically controls the amount of powder filled into the mortar by comparing the load electric signal from molding with each set value, and a control means that samples the molded product an appropriate number of times at a predetermined time without stopping the weight adjustment by compression load. a weighing means that calculates the average weight W_n of the molded product, and calculates the difference between the average weight W_n and the basic weight W_0, and corrects the reference value or each set value of the multistage setting device based on the weight difference. In a weight adjustment device for a molded product in a powder compression molding machine, which comprises a calculation means for determining a correction value, the sample of the weighed molded product calculates an average load P_n, and calculates the basic weight W_0, average weight W_n, and sampling average. A coefficient of variation K is calculated using a load P_n and a load A corresponding to a unit weight, and the coefficient of variation K is changed to the above correction value and multiplied by the reference value or each setting value to correct it. Weight adjustment device for molded products in powder compression molding machines. (20) The change coefficient K is K={P_0+A(W_0-W_n)}/P_0×P_
20. The weight adjustment device for a molded product in a powder compression molding machine according to claim 19, wherein the weight adjustment device is determined from the formula n/P_0. (21) The change coefficient K is K={P_n_-_1+A(W_0-W_n)}/P_
20. The weight adjustment device for a molded product in a powder compression molding machine according to claim 19, wherein the weight adjustment device is determined from the formula n_-_1×P_n/P_n_-_1. (22) Change coefficient K is (P_n-P_n_-_1)×(W_n-W_0)>0
In this case, the coefficient K is K=P_n_-_1+A(W_0-W_n)}/P_n
Obtained from the formula of _-_1, (P_n-P_n_-_1)×
If (W_n-W_0)≦0, the coefficient K is K={P_n_-_1+A(W_0-W_n)}/P_
20. The weight adjustment device for a molded product in a powder compression molding machine according to claim 19, wherein the weight adjustment device is determined from the formula n_-_1×P_n/P_n_-_1. (23) The change coefficient K is K=P_n/{P_n_-_1+A(W_n-W_0)
20. The weight adjustment device for a molded product in a powder compression molding machine according to claim 19, wherein the weight adjustment device is determined from the formula: }. (24) If the powder coefficient K is (P_n-P_0)×(W_n-W_0)>0, calculate the coefficient K from the formula K={P_0+A(W_0-W_n)}/P_0, and calculate (P_n-P_0)×( W_n−W_0)≦0
In this case, the coefficient K is K={P_0+A(W_0-W_n)}/P_0×P_
20. The weight adjustment device for a molded product in a powder compression molding machine according to claim 19, wherein the weight adjustment device is determined from the formula n/P_0. (25) Molding in the powder compression molding machine according to claim 21, 22 or 23, characterized in that the change coefficient K is changed to P_n_-_1 and uses basic load P_0 at the initial operation and restart, respectively. Product weight adjustment device. (26) Claims 19, 20, 2, wherein the load A is multiplied by a coefficient of variation E that takes into account factors that change over time.
26. A weight adjustment device for a molded product in a powder compression molding machine according to 1, 22, 23, 24 or 25.