JP3610086B2 - Prevention of product biting of horizontal seal heater in horizontal bag filling and packaging method - Google Patents

Description

[0001]
[Industrial application fields]
According to the present invention, a lateral seal heater bite for a misaligned product in a horizontal bag-filling and packaging method that can prevent a lateral seal on the front side or the rear side of a packaging film depending on a shortage of an article to be packaged. It is related with the prevention method.
[0002]
[Prior art]
Conventionally, as a packaging method to cope with the case where an article to be packaged is not sent to the former, a horizontal bag making filling and packaging method (empty bag generating packaging) in which an empty bag in which the article to be packaged is not continuously packaged is generated. ) And horizontal bag making filling and packaging method (empty packaging avoiding occurrence of empty bag) that interrupts packaging until an article to be packaged is fed by a carry-in conveyor so that no empty bag is generated.
[0003]
Empty packaging is used to wrap the packaging film on the former by pulling the film edges on both sides of the packaging film with a pair of film transfer rolls, etc., and then wrapping the packaging film in a cylindrical shape inside the former Next, for example, a vertical seal is performed with a pair of vertical seal heaters to form a packaging cylinder, and an article to be packaged is fed into the former by a carry-in conveyor, and a registration mark printed on a packaging film, for example, with a horizontal seal heater Lateral sealing is performed at an appropriate position such as at a predetermined interval, and even when the carry-on conveyor does not send the packaged items to the former, the bag is filled so that an empty bag is generated to continue packaging. Packaging method.
[0004]
To avoid the occurrence of empty bags, packaging can be done at any time by wrapping the wrapping film on the former by pulling the film edges on both sides of the wrapping film with a pair of film transfer rolls, etc. Next, for example, a vertical cylinder is formed with a pair of vertical seal heaters to form a packaging cylinder, and an article to be packaged is fed into the former by a carry-in conveyor, and the registration mark printed on the packaging film is printed with a horizontal seal heater, for example. If it is designed to perform horizontal sealing at an appropriate position at every predetermined interval, such as the position, and the package is not sent to the former by the carry-in conveyor, the packaging film is pulled in until the next package is fed. The vertical seal and the horizontal seal are separated by, for example, separating the pair of vertical heaters and the pair of horizontal seal heaters from each other. A horizontal bag filling and packaging method which is adapted to empty bag does not occur by the cross-sectional.
[0005]
[Problems to be solved by the invention]
In the horizontal form-fill-fill-packaging method, the article to be packaged is fed into the former by the carry-in conveyor, and the article to be packaged is placed at an appropriate position such as between the registration marks printed on the packaging film. Since it is faster than the transfer speed, the object to be packaged is shifted to the front side or the rear side even if there is a slight shift in the feeding timing of the object to be packaged. If the positional displacement of the packaged object in the forward or backward direction exceeds the allowable dimension, the packaged object is bitten by the lateral seal heater. Therefore, it is desirable to detect the positional deviation of the packaged object so that the front or rear side seal of the packaged object is not performed. For example, when an opaque packaging film is used, the inside of the packaging cylinder Since the positional deviation of the packaged item could not be detected, it was not possible to prevent the lateral seal on the front or rear side of the packaged product from being carried out. There was a problem that it was complicated.
[0006]
The object of the present invention has been devised in consideration of the above-mentioned points. For example, when an opaque packaging film is used, the front side or the rear side of the package is not cut or cut horizontally. An object of the present invention is to provide a method for preventing product jamming of a heater for horizontal sealing in a horizontal bag making filling packaging method.
[0007]
[Means for Solving the Problems]
The product of the horizontal seal heater in the horizontal bag-filling packaging which is the first invention of the present application is to prevent the product from being caught by the former while bending the packaging film into the former and bending the inner side of the film by the former to vertically seal the film edges on both sides. A packaging cylinder is formed, and the packaging cylinder is laterally sealed by a lateral seal heater at a predetermined interval position between the articles to be packaged fed into the packaging cylinder by a carry-in conveyor, and is fed into the packaging cylinder. In the horizontal bag making and filling packaging in which packaging is continued by forming an empty bag according to the shortage of the packaged item, the packaged product is transferred together with the packaged cylinder by the packaged object detection sensor facing the packaged cylinder. The horizontal seal for detecting the front end of each packaged object and performing the horizontal seal on the number of pulses output by the pulse generating means in proportion to the transfer speed of the packaging film If the number of pulses counted until the time when the package detection sensor detects the front end of the package is smaller than a predetermined first threshold, the package is counted. The number of pulses counted until the side detection of the front side of the article to be packaged is not performed, and the number of pulses counted until the front end of the article to be packaged is determined as a value larger than the first threshold value. If it is greater than the second threshold value, the lateral seal on the back side of the package is not performed, and the next horizontal seal is performed without the package detection sensor detecting the package. In this case, the number of pulses is started again from the set time of the horizontal seal operation for the next horizontal seal.
[0008]
The product of the horizontal seal heater in the horizontal bag making and packing of the second invention of the present application is a method for preventing product biting by pulling the wrapping film into the former and bending the film by the former to vertically seal the film edges on both sides. The packaging cylinder is formed, and the packaging cylinder is laterally sealed with a lateral seal heater at a predetermined interval between the articles to be packaged fed into the packaging cylinder by a carry-in conveyor, and the missing article of the packaging object In accordance with the horizontal bag making and filling packaging, the drawing of the packaging film is stopped until the next article to be packaged is fed, and the packaging is continued without forming the empty bag by interrupting the vertical seal and the horizontal seal. And detecting a front end of each packaged article transferred together with the packaging cylinder by a packaged object detection sensor placed in the packaging cylinder. The generation means starts counting the number of pulses output in proportion to the transfer speed of the packaging film from the side seal operation setting time point at which the side seal is to be performed, and the package detection sensor detects the front end of the package When the number of pulses counted up to the time is smaller than a predetermined first threshold, the lateral seal on the front side of the package is not performed, and the package detection sensor When the number of pulses counted up to the time when the front end is detected is larger than a second threshold value which is set in advance as a value larger than the first threshold value, the lateral sealing on the rear side of the package is performed. It is characterized by not.
[0009]
【Example】
FIG. 1 is a diagram showing an embodiment of a method for preventing a product of a horizontal seal heater in a horizontal bag making and filling method according to the first invention of the present application. In this horizontal bag making filling and packaging method, the heater for horizontal sealing is a box motion type, FIG. 1A is a schematic front view of a horizontal bag making filling packaging machine, and FIG. It is a flowchart which shows this method.
[0010]
The embodiment of the horizontal bag making filling and packaging method shown in FIG. 1 is a horizontal bag making filling and packaging method (empty bag generating packaging) in which packaging is continued so as to produce an empty bag. Specifically, a continuous opaque packaging film F (including a web in which an aluminum foil and a plastic film are laminated) fed from the raw roll R is hung on the guide rolls 8 to 11 and then hung on the former 1 to form the former. 1 is bent and passed in a cylindrical shape, and the film edges f on both sides are drawn by a pair of film transfer rolls 2. The vertical seal heater 3 presses a pair of bar heaters 3a that apply heat to the packaging film F by sliding the packaging film F between them, and a packaging film F that is disposed on the downstream side and passed between them. The packaging film F, which is composed of a pair of pressure-bonding roll heaters 3b and is bent into a cylindrical shape, is formed into a packaging cylinder H by vertical sealing with the vertical sealing heater 3. On the other hand, the article W to be packaged is fed into the former 1 by the carry-in conveyor 4 at a predetermined interval and is positioned between the registration marks printed on the packaging film F. The horizontal seal heater 5 performs horizontal seal on the packaging film F at a predetermined interval, that is, at the position of the registration mark, and also when the carry-in conveyor 4 does not feed the article to be packaged W into the former 1. The packaging is continued, and as a result, an empty bag in which the article to be packaged W is not wrapped is formed.
[0011]
According to the embodiment of the method of preventing the product of the horizontal seal heater in this horizontal bag making filling and packaging method, the film edge f fitted between the film transfer roll 2 and the bar heater 3a for vertical sealing. A non-contact-type packaged object detection sensor (for example, a reflection type photoelectric tube) 6 is positioned in a state where it faces the inside of the packaging cylinder H from between them. The front end of each packaged object W accommodated in the packaging cylinder H and transferred together with the packaging cylinder H can be detected one after another by the packaged object detection sensor 6.
[0012]
A suitable pulse generator 7 outputs a number of pulses proportional to the film transport speed. The pulse generating means 7 uses, for example, a rotary encoder provided in a servo motor 13 (not shown) that drives the horizontal seal heater 5. In the microcomputer 12, a predetermined number of pulses counted from the output pulse of the origin signal is set as a lateral seal operation setting time point at which the lateral seal is to be performed on the packaging cylinder. Subsequent output pulses output from the pulse generating means 7 are counted. Then, when the package detection sensor 6 detects the front end of the package W, the pulse counting is stopped.
[0013]
The counted number of pulses is a predetermined first threshold value (required smaller than the number of pulses counted when the article W is positioned in the middle between the registration marks when the output pulses of the rotary encoder 7 are started to be counted. If it is smaller than the set constant), it is determined that the positional displacement of the article W to the front exceeds the allowable dimension. Based on the determination, a position to be output from the microcomputer 12 to the motor driver of the servo motor 13 so that the lateral seal is not performed even if the registration mark on the front side of the packaged article W arrives at the position where the lateral seal should be performed. The command signal is stopped for a required time, and the driving of the lateral seal heater 5 is temporarily stopped.
[0014]
Further, a second threshold value that is predetermined as a value in which the counted number of pulses is larger than the first threshold value (the package W is positioned in the middle between the registration marks when the output pulses of the rotary encoder 7 are started to be counted). If it is larger than a constant that is set to be larger than the number of pulses that are sometimes counted, it is determined that the rearward displacement of the package W exceeds the allowable dimension. Based on the determination, the drive of the lateral seal heater 5 is temporarily stopped so that the lateral seal is not performed even if the registration mark on the rear side of the article to be packaged W arrives at the position where the lateral seal is to be performed.
[0015]
Furthermore, when the detection signal of the package W from the package detection sensor 6 is not input to the microcomputer 12 even if the microcomputer 12 counts the output pulses of the rotary encoder 7 after the set time of the horizontal seal operation has elapsed. Is determined that the article to be packaged W is not supplied. The microcomputer 12 determines to perform the next horizontal seal even if the article to be packaged W is not supplied. In this case, when the microcomputer 12 again counts the output pulse of the rotary encoder 7 corresponding to the next horizontal seal, the count at that time is cleared, and thereafter, that is, the rotary encoder from immediately after the clear. The output pulse of 7 is started to be detected, and the positional deviation with respect to the next packaged object W is detected again.
[0016]
FIG. 2 is a view showing an embodiment of a method for preventing product jamming of a heater for horizontal sealing in the horizontal bag making filling and packaging method according to the second invention of the present application. In this horizontal bag making filling and packaging method, the heater for horizontal sealing is a rotor type, FIG. 2A is a schematic front view of a horizontal bag making filling packaging machine, and FIG. It is a flowchart which shows.
[0017]
According to the embodiment of the horizontal bag making filling and packaging method, when the article to be packaged W is not sent to the former 1 by the carry-in conveyor 4, the packaging is interrupted until the article to be packaged W is fed and no empty bag is generated. This is a horizontal bag making filling and packaging method (packaging at any time to avoid empty bag generation). More specifically, the film edges f on both sides of the opaque packaging film F are drawn by a pair of film transfer rolls 2 so that the packaging film F is hung on the former 1 and bent into a cylindrical shape inside the former 1. And let it pass. Next, the packaging cylinder H is formed by performing vertical sealing with the pair of vertical sealing heaters 3. The article W to be packaged is fed into the former 1 at approximately predetermined intervals by the carry-in conveyor 4 and is positioned between the registration marks printed on the packaging film F. The horizontal seal heater 5 performs horizontal seal on the packaging film F at the registration mark position. When the article to be packaged W is not sent to the former 1 by the carry-in conveyor 4, the drawing of the packaging film F by the pair of film transfer rolls 2 is stopped until the next article to be packaged W is sent, and a pair of Since the vertical seal heater 3 and the pair of horizontal seal heaters 5 are separated from each other and do not perform vertical seal and horizontal seal, an empty bag is not generated.
[0018]
And according to the product entrapment prevention method of the horizontal seal heater in the horizontal bag making filling and packaging method of this embodiment, the film end fitted to perform the vertical seal between the film transfer roll 2 and the bar heater 3a. A non-contact-type packaged object detection sensor (for example, a reflection type photoelectric tube) 6 is located in a state where it faces the inside of the packaging cylinder H from between the edges f. The to-be-packaged object detection sensor 6 detects the front end of each to-be-packaged object W accommodated in the packaging cylinder H and transferred with the packaging cylinder H one after another.
[0019]
Pulses output from appropriate pulse generating means 7 that can be output in proportion to the film transfer speed are counted from the time when the horizontal seal operation is set to be performed. The pulse generating means 7 uses, for example, a rotary encoder provided in a servo motor 13 (not shown) that drives the horizontal seal heater 5. In the microcomputer 12, a predetermined number of pulses counted from the output pulse of the origin signal is set as the horizontal seal operation setting time point at which the horizontal seal is to be performed, and the subsequent output pulses are counted. Then, when the package detection sensor 6 detects the front end of the package W, the pulse counting is stopped.
[0020]
The counted number of pulses is a first threshold value set in advance (required smaller than the number of pulses counted when the article W is positioned in the middle between the registration marks when the output pulses of the rotary encoder 7 are started to be counted. If it is smaller than the set constant), it is determined that the positional displacement of the article W to the front exceeds the allowable dimension. Based on the determination, a position to be output from the microcomputer 12 to the motor driver of the servo motor 13 so that the lateral seal is not performed even if the registration mark on the front side of the packaged article W arrives at the position where the lateral seal should be performed. The command signal is stopped for a required time, and the driving of the lateral seal heater 5 is temporarily stopped.
[0021]
Further, a second threshold value that is set in advance as a value in which the number of pulses counted is larger than the first threshold value (when the output pulse of the rotary encoder 7 starts to be counted, the package W is positioned in the middle between the registration marks. If it is larger than the number of pulses counted to be larger than the number of pulses counted at the time, it is determined that the rearward displacement of the package W exceeds the allowable dimension. Based on the determination, the drive of the lateral seal heater 5 is temporarily stopped so that the lateral seal is not performed even if the registration mark on the rear side of the article to be packaged W arrives at the position where the lateral seal is to be performed.
[0022]
The present invention is not limited to the above embodiments. The embodiment of the first invention of the present application shows a horizontal bag making and packaging method in which the heater for horizontal seal is a box motion type, but the heater for horizontal seal is a rotor type as in the embodiment of the second invention of the present application. It includes a horizontal bag making filling and packaging method. On the other hand, the second embodiment of the present invention shows a horizontal bag filling and packaging method in which the horizontal seal heater is a rotor type, but the horizontal seal heater is a box as in the first embodiment of the present invention. It includes a horizontal type bag making filling packaging method that is a motion type.
[0023]
【The invention's effect】
As described above, according to the method for preventing product biting of the heater for horizontal seal in the horizontal bag making filling and packaging method according to the present invention, when using an opaque packaging film, etc. If the misalignment cannot be detected directly, it is possible to prevent the lateral seal on the front or rear side of the package from being performed, and the lateral seal heater avoids biting the misaligned product. it can.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 relates to one embodiment of a method for preventing product jamming of a horizontal seal heater in a horizontal bag making filling and packaging method according to the first invention of the present application, and (a) is an outline of a horizontal bag making filling packaging machine. A front view and (b) are flowcharts which show the method of the 1st invention of this application.
FIG. 1 relates to an embodiment of a method for preventing a product of a horizontal seal heater in a horizontal bag making filling and packaging method according to the second invention of the present application, and (a) is an outline of a horizontal bag making filling and packaging machine. A front view and (b) are flowcharts which show the method of the 2nd invention of this application.
[Explanation of symbols]
F: Opaque packaging film f ... Film edge H ... Packaging cylinder W ... Package 1 ... Former 2 ... Film transfer roll 3 ... Vertical seal heater 4. ..Loading conveyor 5 ... Horizontal seal heater 6 ... Packed object detection sensor 7 ... Pulse generating means

Claims (2)

While the wrapping film is drawn into the former, the former is bent by the former and the film edges on both sides are vertically sealed to form a wrapping cylinder. Horizontal packaging is performed by performing horizontal sealing on the packaging cylinder at a predetermined interval position with a horizontal sealing heater, and forming an empty bag in response to a shortage of the article to be packaged fed into the packaging cylinder. In filling and packaging, the front end of each packaged object transferred together with the packaging cylinder is detected by a packaged object detection sensor facing the packaging cylinder, and the pulse generating means is proportional to the transfer speed of the packaging film. The number of pulses to be output is started from the side seal operation setting time point when the side seal is to be performed, and the package detection sensor detects the front end of the package When the number of pulses counted up to the time is smaller than a predetermined first threshold value, the lateral seal on the front side of the package is not performed, and the package detection sensor detects the front end of the package. When the number of pulses counted up to the time of detecting is larger than a second threshold value which is predetermined as a value larger than the first threshold value, the lateral seal on the rear side of the package is not performed. In addition, when the next horizontal seal is performed without the package detection sensor detecting the package, the number of pulses is counted again from the setting time of the horizontal seal operation for the next horizontal seal. A method of preventing product jamming of a heater for horizontal sealing in horizontal bag making and filling packaging characterized by starting . While the wrapping film is drawn into the former, the former is bent by the former and the film edges on both sides are vertically sealed to form a wrapping cylinder, and between the objects to be packaged fed into the wrapping cylinder by a carry-in conveyor The packaging cylinder is laterally sealed with a lateral seal heater at a predetermined interval position, and the drawing of the packaging film is stopped until the next packaged object is fed in response to a shortage of the packaged object, and the vertical In the horizontal bag making and filling packaging that continues the packaging without forming an empty bag by interrupting the seal and the horizontal seal, it is transferred together with the packaging cylinder by the packaged object detection sensor facing the packaging cylinder. The front end of each packaged object is detected, and the horizontal seal is performed for the number of pulses output by the pulse generating means in proportion to the transfer speed of the packaging film. When counting is started from the time when the horizontal seal operation is set, and the number of pulses counted until the time when the package detection sensor detects the front end of the package is smaller than a predetermined first threshold value The side seal on the front side of the packaged object is not performed, and the number of pulses counted until the packaged object detection sensor detects the front end of the packaged object is larger than the first threshold value. A method for preventing product jamming of a heater for a horizontal seal in a horizontal bag-filling package , wherein the horizontal seal on the rear side of the package is not performed when the second threshold value is larger than a predetermined second threshold value .

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