JPH0676084B2 - Heating temperature control device for packaging film - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heating capable of automatically controlling the temperature of a heating means such as a sealer for subjecting a packaging film to a required heat treatment according to the feeding speed of the packaging film. The present invention relates to a temperature control device.

[0002]

2. Description of the Related Art A continuous packaging film is formed into a tubular shape,
Various packaging such as a so-called pillow packaging machine or a four-way or three-way sealing packaging machine that performs packaging by sequentially supplying an article to be packaged to the tubular film and performing vertical sealing and end sealing on the tubular film. In a machine, a bag-making machine for molding a packaging bag, or the like, in order to provide a good seal on the packaging film, it is necessary to adjust the sealer temperature according to the change in the feeding speed of the packaging film. However, if the operator adjusts the temperature every time the film feeding speed changes due to the change in the number of revolutions of the packaging machine, etc., it requires extremely complicated work, and the production capacity is unavoidable. It will cause a decrease.

Therefore, as an apparatus for automatically setting the appropriate heating temperature in accordance with the feeding speed of the packaging film, there is, for example, the invention described in JP-A-61-115805 proposed by the applicant of the present application. In the invention according to this disclosure, appropriate seal temperatures are stored in advance for a plurality of feeding speeds of the packaging film, and a map in which a plurality of stored points are connected by a straight line is created. Then, the temperature control is performed by obtaining the seal temperature corresponding to the current feeding speed of the packaging film from the obtained map. Therefore,
It was possible to automatically control the sealing temperature suitable for the feeding speed of the packaging film, which was highly practical.

[0004]

In the above-mentioned temperature control device, when an incorrect seal temperature is set and stored due to an operation error of an unfamiliar operator, a predetermined film feeding is performed based on the erroneous input data. The seal temperature versus speed is determined. As a result, when the map is created as described above, incorrect temperature control data is given in the speed range from the erroneous input point to the front and back points, and good seal temperature control is not performed. That situation often occurred.

As described above, if a center seal or end seal is applied by a sealer whose temperature is controlled based on erroneous input data, a defective packaged product is inevitably produced.
In this case, it is necessary to clear all the temperature data that has already been stored, and to register the proper seal temperature again for each film feeding speed again. In particular, when the set and stored temperature is low, despite the fact that the film feeding speed has become high due to the above-mentioned operation error, the straight line connecting the registration points decreases to the right (the film feeding speed It is pointed out that the temperature changes (in inverse proportion to) and a good seal cannot be provided. Furthermore, temperature control is performed according to each film feeding speed based on the data obtained from the straight line connecting each set and registered points, so it is adequate for film materials with a narrow seal temperature allowable range. There was also the problem that it could not be done.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned various kinds of drawbacks inherent in the temperature control device, and has been proposed in order to solve these problems suitably. An object of the present invention is to provide a heating temperature control device that is not affected by erroneous input data and is controllable so as to be maintained in a predetermined proportional relationship based on the stored data of the temperature of the heating means relative to the film feeding speed. To do.

[0007]

In order to overcome the above-mentioned problems and to achieve the intended purpose, the present invention provides a mechanical device provided with heating means for subjecting a packaging film being supplied to a required thermal processing. A temperature control device which is provided and controls the heating temperature of the heating means according to the feeding speed of the packaging film, and sets a desired heating temperature in the heating means for each predetermined feeding speed of the packaging film. Temperature setting means, a heater for heating the heating means to a required temperature, a temperature detecting means for detecting the temperature of the heating means, and a temperature setting means at a predetermined feeding speed of the packaging film. The heating temperature is stored, and a linear proportional relational expression in which the film feeding speed passing through the memory point and the heating temperature are directly proportional to each other are given, and the heating control of the heater is performed by the data obtained from the relational expression. Then, the temperature of the heating means is controlled at an appropriate heating temperature according to the film feeding speed, and when the number of memory points set and input for each film feeding speed reaches a predetermined number, these predetermined numbers are stored. From the data obtained from the equation relating to the approximate value curve based on the memory point, from the control means for controlling the heating of the heater and controlling the temperature of the heating means at an appropriate heating temperature according to the set film feeding speed. It is characterized by

[0008]

The film heating temperature by the heating means is stored in the control means with respect to the current film feeding speed, and in relation to the stored temperature, a linear proportional relational expression in which the film feeding speed and the heating temperature are directly proportional to each other. Thus, the proper heating temperature according to the desired film feeding speed is obtained, and the heating temperature of the heating means is controlled. Further, when the number of temperature registration points set and stored for each film feeding speed reaches a predetermined number, the data obtained from the equation of the approximate value curve based on these data is used to appropriately heat the film according to the film feeding speed. The temperature is determined and the heating temperature of the heating means is controlled.

[0009]

The heating temperature control device for a packaging film according to the present invention will be described below with reference to the accompanying drawings, with reference to an example of a horizontal bag-making filling and packaging machine which can be preferably implemented.

(Regarding Schematic Structure of Packing Machine) As shown in FIG. 1, a horizontal bag-making filling and packing machine 10 according to an embodiment supplies a material 12 to be packed to a downstream side by an attachment 14 at predetermined intervals. A conveyor 16 is provided. On the downstream side of the supply conveyor 16, a pair of delivery rollers 18, 1
The bag making machine 24 for forming the film 22 fed out from the supply roll 20 by 8 into a tubular shape is arranged.
The object to be packaged 12 supplied from 6 is filled in the tubular film 22. In addition, the film 22 formed into a tubular shape
A pair of feed rollers 26, 26 (only one of which is shown) are disposed on both sides of the overlapping end edge portion in the longitudinal direction of the feed roller 2
The tubular film 22 is fed by 6, 26.

A pair of seal rollers (vertical sealers) 28, 28 (only one of which is shown) is provided downstream of the feed rollers 26, 26.
Are arranged so as to sandwich the overlapping edge portion, and a heater 44 is built in each roller 28. Then, the heater 44 is controlled by a temperature adjusting means 30 described later to obtain a target temperature (appropriate heating temperature).
The pair of seal rollers 28, 28 while being heated up to
The center seal (vertical seal) is provided by pressing and heating the overlapping edge portion.

Further, a pair of seal bodies (end sealers) 32, 32 facing each other with a horizontal film feeding path sandwiched therebetween are disposed further downstream of the seal rollers 28, 28, and each of the seal bodies 32 has the above-mentioned temperature. A heater 46 whose temperature is adjusted via the adjusting means 30 is built in. Then, with the heater 46 heated to the target temperature, the pair of seal bodies 32, 3
2 is configured to perform end sealing / cutting before and after sandwiching the object to be packaged 12 of the tubular film 22.

(Regarding Control System) In FIG. 3, the processing device 36 is a product / temperature setting means 4 including a touch panel or the like.
2 is provided, and by operating the key called on the display screen of the means 42, the data storage section built in the processing device 36 stores the height dimension of the packaged item, the cut pitch of the packaging film, for each package type, Data such as the number of rotations of the packaging and the temperature of the seal rollers 28, 28, the seal bodies 32, 32 or other film heating means are input and stored. As the product / temperature setting means 42, the display screen and the keyboard may be separate entities.

The display screen in the temperature setting mode of the product / temperature setting means 42 includes the following screens. In addition to the seal rollers 28, 28 and the seal bodies 32, 32, a heater name input screen for inputting and setting an optional heating means name such as film preheating provided according to the packaging specification. ON / OFF switching of the heater power supply related to the heater control of the seal rollers 28, 28, the seal bodies 32, 32 and the optional heating means having the above-mentioned input setting, and measurement during operation with respect to the proper temperature set for each heating means. If the deviation amount from the specified temperature exceeds a predetermined range, the input setting of the allowable temperature range for performing error processing, and if various heating means exceed the allowable temperature range, only an alarm is issued. Or, whether to stop the packaging machine, input setting such as switching selection, and given to each heating means optionally provided by the film speed following control described later,
A temperature adjustment condition setting screen in which a linear proportional relational expression is set and the setting data is displayed in a list. It is possible to set and input an appropriate heating temperature for each heating unit, display the input set value, display the current temperature of the heating unit in real time, and regarding the value controlled for the film speed following control described later, A heater temperature setting screen in which the proper heating temperature corresponding to each packaging rotation speed is displayed in a graph and the current packaging rotation speed is indicated on the graph. An overall schematic view of the packaging machine is displayed, the names of the sealing rollers 28, 28 and the sealing bodies 32, 32 or other various film heating means provided in the packaging machine and their locations are shown, and the heating means is also shown. The current status display screen of the heating means in which the ON / OFF setting status of the heating means, the energization status of the heater provided in the heating means, and the current set temperature are listed in real time. These screens are configured to be selectively switchable, and by inputting predetermined data on each display screen, the processing content according to the data setting is stored in the processing device 36. .

The film feeding speed of the feeding roller 18 is calculated by the processing device 36 from the packaging rotation speed input and set by the product type / temperature setting means 42 and the cut pitch of the packaging film. Therefore, based on the data, by the film feeding speed control means 34,
The rotation is controlled. The film feeding speed control means is composed of a motor drive means such as a servo motor and a motor rotation control means, and the rotation of the encoder is feedback-controlled by an encoder provided in the servo motor. Is preferably used.

Further, when the operation mode is set so that the decelerating operation or the accelerating operation of the packaging machine is performed by the synchronous operation with the anteroposterior apparatus of the packaging machine, the rotation speed control of the packaging machine is controlled from the anteroposterior apparatus. A signal is input and the processing device 3
6 calculates the corresponding film feeding speed from the current rotation speed of the packaging machine and the cut pitch of the film which is input and stored in advance, gives a command to the film feeding speed control means 34, and The feeding control means issues a speed command so that the film feeding roller 18 is rotationally controlled at a required rotation speed.

The drive control of the film feeding roller 18 is carried out by the film feeding speed control means comprising a roller rotating means having a speed changing means such as a differential gear via a mechanical transmission system from a main motor of the packaging machine. Of course, it is okay to do so.

Further, the seal rollers 28, 28 and the seal bodies 32, 32, or each heating means optionally set as necessary, are provided with a temperature-sensing device such as a thermocouple or thermistor for detecting the current temperature of heating the film. Temperature detecting means 38, 40 composed of elements are provided, and the temperature data detected by each temperature detecting means is input to the temperature adjusting means 30 provided in the processing device 36. Then, in the processing device 36, an appropriate heating temperature corresponding to the calculated film feeding speed is obtained by a proportional relational expression to be described later, and the obtained appropriate heating temperature is compared with the current temperature which is sequentially input, The adjusting means 30 controls the heater 44,
The energization ON / OFF control of 46 is performed.

(Regarding Heater Temperature Adjustment) The temperature adjustment of the heaters 44 and 46 by the temperature adjusting means 30 is proportional to O
It is performed by N / OFF control. In this control, the current temperature is measured every 1.2 seconds of the proportional cycle, and the input temperature TS is compared with the actual control target value TB (described later) to determine the actual control target value TB.
On the other hand, when the input temperature TS is low (when the temperature of the heater is increased), the heaters 44 and 46 are arranged in the pattern shown in FIG.
Energization control is performed. For example, when the input temperature TS is 5 ° C. lower than the actual control target value TB, 1.2 × within 1.2 seconds which is the interval for measuring the input temperature TS (current temperature).
Energize for 5/6 seconds only. When the input temperature TS is 2 ° C. lower than the actual control target value TB, within 1.2 seconds,
Energize only for 1.2 × 2/6 seconds to bring the input temperature TS close to the actual control target value TB.

Further, when the input temperature TS is higher than the actual control target value TB (when the temperature of the heater is lowered), the energization control to the heaters 44 and 46 is performed in the pattern shown in FIG. For example, when the input temperature TS is 3 ° C. higher than the actual control target value TB, the electricity is supplied only for 1.2 × 1/6 seconds out of 1.2 seconds which is the interval for measuring the input temperature TS. Further, when the input temperature TS is 1 ° C. higher than the actual control target value TB, the input temperature TS is set to the actual control target value TB by energizing only 1.2 × 3/6 seconds within 1.2 seconds. Get closer.

The actual control target value TB is a target temperature (appropriate heating temperature) TA obtained by an equation described later, with a necessary correction. For example, when the target temperature TA is high, in order to bring the input temperature TS close to the target temperature TA in a short time, an actual control target value TB higher than the actual target temperature TA is set, and the actual control target value TB is set. Bring the input temperature TS closer. At this time, the actual control target value TB is set by the correction arithmetic expression according to Expression 1.

[Formula 1] TA Target temperature TB Actual control target value TS Input temperature J Temperature coefficient (constant: 0.02) K Temperature correction coefficient (constant: 4 ° C)

Further, since the heating temperature for the film is set and input on the basis of the operating time of the packaging machine, the film feeding is stopped when the packaging machine is stopped.
Reduction of heat absorption by the film on the surface facing the film in the heating means, and the sealing rollers 28, 28
In the heating means that is driven to rotate, such as the seals 32 and 32, the effect of air cooling during operation is eliminated,
When stopped, the temperature of the surface of the heating means facing the film rises as compared to during operation. Therefore, in order to prevent an excessive temperature rise of the heating means, an actual control target value TB lower than the actual target temperature TA is set, and the actual control target value TB is set.
Control is performed to bring the input temperature TS close to. At this time, the actual control target value TB is set by the correction calculation formula according to Formula 2.

[Formula 2] M Machine stop offset coefficient (constant: 0.02)

The temperature detecting means 3 arranged in the heating means such as the seal roller 28 and the seal body 32 which are driven to rotate.
Transmission and reception of an electric signal between the temperature control means 8 and 40 and the temperature control means 30 are performed via a brush ring. In this case, an accurate temperature may not be detected due to poor contact of the brush ring, etc. If incorrect temperature data is input to the temperature adjusting means 30 and is judged as the present temperature, incorrect data may result. Based on this, temperature control will be performed.

Therefore, in the embodiment, the temperature is measured a plurality of times at predetermined time intervals, and the average value of the obtained values is set as the input temperature TS. For example, temperature measurement is performed 8 times at intervals of 1.2 seconds, and the obtained values are 150 ° C, 153 ° C, 151 ° C, 153 ° C.
When the temperatures are ℃, 148 ℃, 149 ℃, 152 ℃, 148 ℃, the average value of 150.5 ℃ is handled as an accurate input temperature TS. As a result, it is possible to effectively prevent the heating temperature from being controlled based on erroneous temperature data that is far from the current temperature.

(Regarding film feeding speed follow-up control) In the processing device 36, first, when the worker inputs and sets a desired heating temperature by the product type / temperature setting means 42 at the currently set packaging rotation speed, the processing is performed. The value is stored in the device 36 as a temporary set temperature as a film feeding speed value with respect to the current packaging rotation speed, and as shown in FIG. 4, constant temperature control is performed irrespective of changes in the film feeding speed. Is set. Then, a packaging test is performed in a state where the heater temperature is controlled based on the temporary set temperature, and the temperature is stored (registered) when the proper heating temperature is determined. When the proper heating temperature is registered, as shown in FIG. 5, the inclination of 20 ° passing through the coordinate (registration point) of the proper heating temperature with respect to the film feeding speed is increased to the right (when the film feeding speed is increased,
The heating temperature also rises proportionally) is 109 ° C / 7
It is obtained and set from a proportional relational expression of 5 (m / min). This proportional relational expression is calculated from past empirical values, and after temperature registration, the film feeding speed follow-up control of the heating temperature is performed based on the data obtained from this proportional relational expression.

The rotation speed of the packaging machine and the packaging film 2
When the cut pitch of No. 2 is changed and the film feeding speed is changed, as shown in FIG. 5, when the follow-up control by the straight line in the proportional relation equation regarding the initially set point causes a problem, As shown, by setting and registering the appropriate heating temperature according to the current film feeding speed,
A new registration point is stored in the processing device 36, and temperature data for each film feeding speed is calculated so that a straight line rising to the right with an inclination of 20 ° is set for the new registration point from the proportional relational expression. And processing device 3
6 is stored. Also, if the heating temperature obtained by this proportional relation expression exceeds a preset allowable upper and lower limit temperature, correction is made so that the heating temperature becomes constant (horizontal in the graph) in the area outside the allowable range. It is configured. For example, in the film feeding speed range where the heating temperature is 300 ° C. or higher, the heating temperature is kept at 300 ° C.,
The heating temperature is maintained at 50 ° C. in the film feeding speed range where the heating temperature is 50 ° C. or lower.

Then, when the total number of registered points reaches a predetermined number (for example, 10 points) by repeating the above-mentioned setting registration work for each film feeding speed, as shown in FIG. , The temperature control data for each film feeding speed is calculated by the equation regarding the approximation curve for all the registration points, and the obtained approximation curve is the value horizontally moved so as to pass the latest registration point. The data is corrected and stored in the processing device 36 so that the temperature is controlled at. After that, the temperature control that follows the film feeding speed is performed based on the stored data. In the example, as an approximate value curve,

[Formula 3]

[Formula 4] V Film speed at registration point (ΣV is total of each point) T Temperature at registration point (total of each point of ΣT) n Number of registration points (for example, 10 points) v Current film speed t Target temperature (Equation 1 , Calculated from Equation 2) e A quadratic regression curve obtained by the base of natural logarithm (2.71828),

[Formula 5]

[Formula 6] It is set so that it can be calculated from the exponential regression curve obtained in. Then, the calculation data of either one of the regression curves, which has less deviation from each registration point, of the data obtained from the equations of the quadratic regression curve and the exponential regression curve for a predetermined number of registration points is selected. There is.
Further, as described above, the obtained regression curve is horizontally moved up and down, and data correction is performed so as to pass the latest set registration point (10th point in this example). In addition,
When new points are registered and stored in excess of a predetermined number of registered points, the oldest first registered and stored point is deleted as shown in FIG. Based on 10 registration points from the 11th to the 11th, data based on one curve newly selected from the two regression curves is calculated, and as described above, the curve passes through the latest registration point. It is set to give the correction data.

When a plurality of registration points are concentrated and set on the low speed side of the film feeding speed, or conversely, a plurality of registration points are concentrated and set on the high speed side of the film feeding speed. In some cases, if there is a part in the regression curve obtained that decreases to the right (the heating temperature changes in inverse proportion to the film feeding speed), as shown in FIG. 9 and FIG. In the changing area,
Data correction is performed so that the curve is forced to be horizontal (the temperature is not controlled according to the film feeding speed).

(Countermeasures for temperature abnormality detection) Here, in the packaging machine according to the embodiment, when a temperature control abnormality is detected, the following control is performed to cause a large amount of defective products due to defective sealing. It is set to prevent the occurrence of the above. In the case of heater abnormality Even if the state of continuous energization (ON) to the heaters 44, 46 has passed for 2 minutes, the input temperature TS by the temperature detecting means 38, 40
If the temperature does not rise by 2.5 ° C. or more, it is determined that the heater is broken, the packaging machine is immediately stopped, and an error is displayed on the display screen of the product / temperature setting means 42. In addition, the control power supply for the heaters 44 and 46 in which an abnormality has occurred is forcibly turned off.
F In the case of SSR abnormality, the energization OFF state to the heaters 44 and 46 is continuously 3
If the input temperature TS by the temperature detecting means 38, 40 rises by 20 ° C. or more even after a lapse of minutes, it is determined that the solid state relay for heater control is abnormal, the packaging machine is immediately stopped, and the product type / temperature is set. An error is displayed on the display screen of the means 42. In addition, the heaters 44 and 4 where the abnormality has occurred
The control power supply of 6 is forcibly turned off. In case of abnormality in temperature detecting means If the input temperature TS input by the temperature detecting means 38, 40 and obtained in a 1.2-second cycle is 3 ° C. or less for four consecutive times, the temperature detecting means is disconnected. A judgment is made and the packaging machine is immediately stopped, and an error is displayed on the display screen of the product type / temperature setting means 42. Further, the control power supply for the heaters 44 and 46 in which the abnormality has occurred is forcibly turned off. When the allowable temperature range is exceeded Target temperature TA and input temperature TS obtained in 1.2-second cycles
The amount of deviation from the
When the temperature exceeds (for example, ± 30 ° C.) four times in a row, and if the packaging machine is in continuous operation, an error display is displayed on the display screen of the product type / temperature setting means 42 after the packaging machine is cycled. To do. During the temperature rise control before the completion of the operation preparation after the temperature setting, "in temperature setting" is displayed on the display screen of the product / temperature setting means 42. However, error detection is not performed in the following cases. (1) Processes other than before preparation for operation and during continuous operation. (2) The product / temperature setting means 4 before the operation preparation is completed
If "Temperature setting in progress" is displayed on 2, "ignore"
Continuous operation after selecting error monitoring unnecessary by key operation. (3) 10 seconds from the start of continuous operation. In the case of an abnormal brush ring When the input temperature TS from the temperature detecting means 38, 40 varies remarkably, it is judged that the contact of the brush ring is poor,
An alarm is displayed on the display screen of the type / temperature setting means 42, and a buzzer sounds to notify the operator. Among a plurality of (eight in the embodiment) measured temperatures by the temperature detection means 38, 40, the difference from the average value (input temperature TS) of them is ± X ° C. (set according to various conditions) or more. If there are more than one, an alarm is displayed on the display screen of the product / temperature setting means 42.

[0030]

Operation of the Embodiment Next, the operation of the heating temperature control device according to the embodiment thus constructed will be described with reference to the flowchart of FIG.

When the power is turned on, first, step 100 is performed.
(Hereinafter, "step" is referred to as "S"), initialization processing such as clearing the storage unit in the processing device 36 is performed.
In S101, it is determined whether the continuous operation or the operation with a different packaging type is performed. In the case where the operation is continued under the same set conditions that the operation was performed last time, the process proceeds to S105. If the setting needs to be changed, the setting change mode is selected by the type / temperature setting means 42 to move to S102, where the type / temperature is changed.
The temperature setting means 42 inputs a new setting for the package type name or selects a preset package type name. Subsequently, in S103, various types of data such as the cut pitch of the packaging film and the number of rotations of the packaging are set and input by the product type / temperature setting means 42. Next, in S104, the above S10
When the feeding speed of the packaging film is calculated from the cut pitch set and input in 3 and the rotation speed of the packaging machine, the process proceeds to S105.

In S105, the temperature setting mode of the heating means is selected by the product / temperature setting means 42.
When this mode is selected, the process proceeds to S106 and the product type /
The temperature setting means 42 numerically inputs the heating target temperature TA for the seal rollers 28, 28, the seal bodies 32, 32 and other heating means in accordance with the current packaging rotation speed and stores it in the processing device 36 as a temporary set temperature. Figure 4
As shown in, the input temporary set temperature is set so that a constant temperature control is always performed regardless of the change of the film feeding speed.

Further, in S105, an appropriate temperature can be obtained at the current packaging rotation speed under the conventional setting conditions.
If it is not necessary to change the temperature setting, the temperature setting / changing mode is not selected, and the process proceeds to S107, and the data obtained from the straight line based on the proportional relation equation of the inclination 20 ° that was previously registered and stored, or registered and stored up to the previous time Based on the stored data obtained from the equation regarding the regression curve obtained from the plurality of registered points, the proper heating temperature is calculated from the current film feeding speed calculated in S104.
After calculating by, the process proceeds to S112.

Next, in S108, when it is determined that the temporary set temperature input in S106 is not preferable, or when it is determined that the test operation is necessary for the initial setting, the registration operation is performed. Without that, the process proceeds to S112. Further, when the temporary set temperature data input in S106 and stored in the processing device 36 is determined to be an appropriate value, the decision key provided in the product type / temperature setting means 42 is pressed, As an appropriate heating temperature for the film with respect to the current film feeding speed, the processing device 36
Registered and stored in. Next, in S109, it is determined whether or not the number of temperature-registered points for each film feeding speed is 10 or more up to the present, and when it is determined that the number of registered points is 10 or more. Proceeds to S110.

If the number of registered points to date is less than 10 in S109, the process proceeds to S111, in which the current film feed obtained from the proportional relational expression of the straight line passing through the latest registered points and having an inclination of 20 °. After obtaining the heating temperature corresponding to the feeding speed and storing the heating temperature, the process proceeds to S112.

Then, in step S110, as shown in FIG. 7, from the latest 10-point data registered and stored in the processing unit 36 up to the present time, both the quadratic regression curve and the exponential regression curve are used to calculate the 10 An approximate value curve for the registration data of points is calculated, and one of the two regression curves with less deviation from the registration data of 10 points is selected. In addition, the correction data horizontally moved up and down so that the regression curve passes through the latest registration point is calculated and stored in the processing device 36, and from the data, an appropriate heating temperature according to the current film feeding speed is stored. And store the value in the processing device 36,
Proceed to 112. As a result, the heating temperature is set to be proportionally controlled according to the given film feeding speed.

At S112, the seal rollers 28, 2 are
The temperature detected by the temperature detecting means 38 and 40 in the heating means such as 8 and the seal bodies 32 and 32 that are driven to rotate are measured a plurality of times at predetermined time intervals, and the average value is input as the current value. A process of determining the temperature TS is performed. Then, the process proceeds to S113, and the proportional ON / O described above is performed.
By the FF control, the electric power of the heaters 44 and 46 is controlled so as to approach the temporary set temperature stored in S106 or the target temperature TA stored in S110 or S111.

At S114, the current heater temperature is within the allowable range with respect to the temporary set temperature or the target temperature TA,
Here, it is determined whether the temperature is within ± 30 ° C. If the heating temperature of the heaters 44, 46 exceeds the allowable range with respect to the temporary set temperature or the target temperature TA, the operation of the packaging machine is stopped in S117. In S117, if the heater temperature deviates from this allowable range during the operation of the packaging machine, it is determined that an abnormality has occurred in the heater control, the packaging machine is cycled, and then the product / temperature setting means 42 is operated. The display screen indicates that a temperature control abnormality has occurred, and a buzzer sounds an alarm. In addition, S106
Even if the heater temperature has not been set sufficiently and the heaters 44 and 46 are rising toward the set temperature, the heating temperature of the heaters 44 and 46 is allowed to exceed the temporary set temperature. It is not possible to drive until it is within the range. Therefore, the heating temperature of the heaters 44 and 46 does not remain insufficient, or the film is not heated in an overheated state.

In this S114, the heater 4
The heating temperature by 4,46 is rising against the target temperature,
It is possible to select the forced operation mode capable of performing a test operation or the like of the packaging machine when it does not reach the allowable range. The process can be advanced to S115 by selecting this forced operation mode with the product type / temperature setting means 42.

Step S115 is a step of judging whether or not the packaging machine is to be operated. By turning on a start switch (not shown) provided in the body of the packaging machine, the process proceeds to step S116 to operate the packaging machine. Is started, and the process returns to S105 to repeat the above process. If it is already in operation, use a stop switch (not shown) to move to S117,
After the operation of the packaging machine is stopped, the process returns to S101,
The above processing is repeated from the selection of the operation mode again.

As described above, when the number of registered points is less than 10, the optimum heating temperature corresponding to the film feeding speed is automatically calculated from the data obtained from the linear proportional relational expression passing through the latest registered points. The film heating temperature by the seal roller 28, the seal body 32, and other heating means is controlled by setting the temperature. At this time, since the proportional relational expression is set so that the film feeding speed and the heating temperature have a direct proportional relationship, good and reliable sealing can be performed.

When the number of registered points is 10 or more, the heating temperature proportional to the film feeding speed is automatically set by the data obtained from the equation of the approximate value curve based on the stored 10 registered points. With this configuration, it becomes possible to control the temperature at an appropriate heating temperature according to the temperature characteristics of various films used for each set product at a desired film feeding speed. Further, even if the operator sets and stores incorrect data, the temperature control is performed by obtaining the approximate value curves of a plurality of registration points, so that there is no temperature control failure due to erroneous input.

In the examples, the case where the temperature control of the sealer for performing the center seal or the end seal on the film formed into a tubular shape in the horizontal bag-making filling and packaging machine was mainly described, but the present application is not limited to this. It is not a thing, for example, a film heating means for making it easy to make a crease in the packaging film, or the film is arranged at a position close to the upstream side of the rotary roll type sealer according to the specifications of high speed feeding. The preheating bar sealer appropriately provided to prevent a sealing failure, or a known film heating means appropriately used in various packaging machines such as a four-way or three-way seal packaging machine or a bag-making machine for forming a packaging bag, etc. Of course good things.

Further, in the present embodiment, when the number of temperature set points stored and registered in the processor becomes 10 or more, an approximate value curve for the stored and registered 10 points is obtained and the data thereof is obtained. However, the present invention is not limited to this, and the number of points is 10 points or less or a predetermined number or more of memory registrations. It is possible to carry out with the specified value.

Furthermore, in the present embodiment, the feeding speed of the packaging film is a value calculated from the number of revolutions of the packaging machine and the cut pitch of the film, but the present invention is not limited to this, and the film feeding roller is not limited to this. Alternatively, when the speed value is obtained from a pulse signal or the like of an encoder or the like arranged in the rotary drive system, or the rotation speed of a drive source serving as a reference of each drive mechanism of the packaging machine is measured by the encoder or the like. , A value calculated from the measured value and the cut pitch of the film, or a value obtained by detecting the registration mark interval attached to the packaging film with a detector, etc. It can be changed.

[0046]

As described above, according to the heating temperature control device for a packaging film according to the present invention, it is possible to store the proper heating temperature of the heating means for the film feeding speed, and to store the film feeding speed thereafter. The temperature control of the heating means is automatically performed on the basis of the data on the straight line obtained from the proportional relational expression set for the stored temperature. That is, the operation of setting and storing a plurality of temperature data and the operation of changing the setting of the heating temperature accompanying the change of the film feeding speed are unnecessary. Further, since the proportional relational expression is set so that the film feeding speed and the heating temperature are kept in a direct proportional relationship, the heating temperature is controlled to decrease despite the film feeding speed increasing. Instead, the packaging film can always be subjected to good thermal processing.

Further, when the number of registration points for the proper heating temperature set for each film feeding speed reaches a predetermined number, the film feeding is performed by the data obtained from the equation regarding the approximate value curve for the plurality of registration points. Since the heating temperature of the heating means with respect to the feeding speed can be set, a speed-following temperature control close to ideal according to the characteristics of the packaging film becomes possible. Moreover, as the approximate value curve, one of the quadratic regression curve and the exponential regression curve, whichever has the smaller deviation from each registered point, is selected, so that more accurate temperature control can be performed. Further, the speed tracking temperature control is performed by the data obtained from the equation of the approximate value curve based on the latest predetermined number of registered points among the stored and stored registered points, thereby further improving the accuracy of the approximate value curve. It also has the advantage that it can be done.

By measuring the temperature of the heating means a plurality of times at predetermined time intervals, it is possible to prevent erroneous input of the current temperature and to control the heating temperature in a good condition. Further, since it is possible to appropriately deal with the temperature abnormality detection, it is possible to prevent a large amount of defective products due to the defective seal. Further, the product type / temperature setting means inputs predetermined data, and various display screens for displaying the current situation can be selected, so that the operator can change the data setting while grasping the current situation. be able to.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a packaging machine in which a heating temperature control device according to an embodiment is adopted.

FIG. 2 is a graph showing a pattern of heater proportional ON / OFF control.

FIG. 3 is a graph showing a pattern of heater proportional ON / OFF control.

FIG. 4 is a graph diagram when a temporary set temperature is set.

FIG. 5 is a graph diagram when a proper heating temperature at a first point is registered.

FIG. 6 is a graph diagram when a proper heating temperature at a second point is registered.

FIG. 7 is a graph diagram when an approximate value curve is set when there are 10 registration points.

FIG. 8 is a graph when the number of registered points is 11, the first point is deleted, and an approximate value curve is set based on the remaining 10 points.

FIG. 9 is a graph diagram in which, when a downward sloping portion occurs in the approximate value curve, the portion is horizontally corrected.

FIG. 10 is a graph showing a case where a part of the approximated value curve is descending to the right,
It is the graph figure which corrected this part horizontally.

FIG. 11 is a temperature control flowchart of the packaging machine according to the embodiment.

[Explanation of symbols]

 10 Horizontal bag-making filling and packaging machine 22 Packaging film 34 Film speed control means 36 Processing device 38,40 Temperature detection means 42 Variety / temperature setting means

Front Page Continuation (72) Inventor Shingo Baba 4-380 Nakaodai, Nishi-ku, Nagoya, Aichi Prefecture Fujikikai Co., Ltd. Nagoya Plant (56) References JP-A-61-115805 (JP, A) JP-A-56- 4508 (JP, A) Japanese Patent Sho 49-41673 (JP, B1)

Claims (18)

[Claims] 1. A temperature, which is arranged in a mechanical device provided with a heating means for subjecting a packaging film being supplied to a required heat treatment, and which controls a heating temperature of the heating means in accordance with a feeding speed of the packaging film. A control device, a temperature setting means for setting a desired heating temperature in the heating means for each predetermined feeding speed of the packaging film, a heater for heating the heating means to a required temperature, and the heating means. Temperature detection means for detecting the temperature of the packaging film, stores the heating temperature set by the temperature setting means at a predetermined feeding speed of the packaging film, and the film feeding speed passing through the memory point and the heating temperature are directly proportional. Is given, and the heating control of the heater is performed based on the data obtained from the relational expression to control the heating means at a proper heating temperature according to the film feeding speed. In addition, when the number of memory points set and input for each film feeding speed reaches a predetermined number, the heater is converted by the data obtained from the equation regarding the approximate value curve based on the predetermined number of memory points. And a heating means for controlling the heating means to control the temperature of the heating means at an appropriate heating temperature according to the set film feeding speed. 2. When the number of stored points reaches a predetermined number, for each of the predetermined number of stored points among the data obtained from the equation of the approximate value curve consisting of a quadratic regression curve or an exponential regression curve The heating temperature control device for a packaging film according to claim 1, wherein data obtained from one of the equations having a small deviation is selected. 3. The heating temperature control device for a packaging film according to claim 1, wherein the approximate value curve is corrected so as to pass through the latest storage point stored in the control means. 4. When the data of the storage point is stored in excess of a predetermined number, a value obtained from an equation of an approximate value curve is obtained based on a predetermined number of remaining data after erasing the oldest data. The heating temperature control device for a packaging film according to claim 1, 2 or 3. 5. The heating temperature set and input by the temperature setting means for each predetermined feeding speed of the packaging film can be set for each type of the packaging film or the packaged object packaged by the film. The heating temperature control device for a packaging film according to claim 1, wherein 6. The temperature detecting means measures the current temperature of the heating means in every required proportional cycle, and the temperature is measured during the proportional cycle according to a deviation between the present temperature and an appropriate heating temperature obtained from the data. ON / OFF control of the heating power source is performed, and when the target appropriate heating temperature is high, an actual control target value higher than the actual target temperature is set,
The heating temperature control device for a packaging film according to claim 1, wherein a correction calculation for setting an actual control target value lower than an actual target temperature is performed when the operation of the mechanical device is stopped. 7. Regarding the current temperature measurement of the heating means, the temperature detection means performs temperature detection a plurality of times at predetermined time intervals, and an average value of the obtained plurality of measured values is set as the current temperature. The heating temperature control device for a packaging film according to claim 1, wherein 8. The heating temperature control device comprises a product type / temperature setting means, and the current temperature measured by the temperature detecting means rises by a predetermined temperature or more even if a continuous energization state to the heating means has passed for a predetermined time. If not, the mechanical device is stopped, an error is displayed on the display screen of the product type / temperature setting means, and the control power supply for the heating means is forcibly turned off. Heating temperature control device. 9. The heating temperature control device includes a product type / temperature setting means, and the current temperature measured by the temperature detecting means is a predetermined temperature even if a predetermined time has elapsed while the power supply to the heating means is turned off continuously. 2. When the temperature rises above the level, the mechanical device is stopped, an error is displayed on the display screen of the product type / temperature setting means, and the control power supply for the heating means is forcibly turned off. Film heating temperature control device. 10. The heating temperature control device comprises a product type / temperature setting means, and stops the mechanical device when the current temperature measured by the temperature detection means is below a predetermined temperature continuously for a predetermined number of times. The heating temperature control device for the packaging film according to claim 1, wherein an error is displayed on the display screen of the product type / temperature setting means and the control power source of the heating means is forcibly turned off. 11. The heating temperature control device includes a product type / temperature setting means, and a deviation amount between a target heating temperature and a current temperature during a continuous operation of a machine device determines a preset temperature allowable upper and lower limit range value. When the number of times exceeds the number of times in succession, an error is displayed on the display screen of the product type / temperature setting means and the mechanical device is stopped.
A heating temperature control device for the packaging film described. 12. The heating temperature control device includes a product type / temperature setting means, and when the current temperature measured by the temperature detecting means varies remarkably or a plurality of measurements are made by the temperature detecting means in predetermined time units. 8. The packaging according to claim 7, wherein when there are a plurality of temperatures having a difference from an average value thereof that is equal to or higher than a predetermined temperature, an alarm is displayed on the display screen of the product type / temperature setting means. Film heating temperature control device. 13. The heating temperature control device includes a product type / temperature setting means, and the means is configured so that a plurality of display screens can be selectively switched, and predetermined data input is performed on each display screen. The heating temperature control device for a packaging film according to claim 1, wherein: 14. The type / temperature setting means is provided with a name input screen for inputting and setting the name of the heating means optionally set as required.
3. A heating temperature control device for a packaging film according to 3. 15. The product type / temperature setting means displays the name of each heating means and turns on the power supply for controlling each heating means.
N / OFF switching, input setting of the allowable upper and lower limit range value of the deviation amount between the proper heating temperature of each heating means and the current temperature, and selection of a countermeasure when the current temperature of each heating means exceeds the allowable upper and lower limit range The present invention is characterized by including a temperature adjustment condition setting screen on which input setting and at least data input setting of a proportional relational expression regarding the straight line to the heating means optionally set are possible and various setting data are displayed in a list. The heating temperature control device for a packaging film according to claim 13. 16. The type / temperature setting means is capable of setting and inputting an appropriate heating temperature for the heating means, displaying the input set value, and displaying the current temperature of the heating means in real time, and each film. 14. The heating temperature control of the packaging film according to claim 13, further comprising a heater temperature setting screen on which a proper heating temperature corresponding to the speed is displayed in a graph and a current film speed is indicated on the graph. apparatus. 17. The type / temperature setting means displays an overall schematic view of a mechanical device, indicates the name and location of the heating means arranged in the mechanical device, and further turns on the heating means. 14. The heating temperature control device for a packaging film according to claim 13, further comprising: a current status display screen of the heating means for displaying a list of ON / OFF setting states and current set temperatures in real time. 18. The mechanical device and its heating means are
The heating temperature control device for a packaging film according to claim 1, which is a vertical sealer and an end sealer in a horizontal bag-making filling and packaging machine or a vertical bag-making filling and packaging machine.