JP2009280258A - Vertical seal mechanism of bag manufacturing and packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical seal mechanism which can enhance quality of sealing and can perform a vertical seal at a high speed in a bag manufacturing and packaging machine performing continuously the vertical seal. <P>SOLUTION: The vertical seal mechanism 2 is equipped with a vertical seal apparatus 21 and a conveying apparatus 22. Here, a vertical seal member 21 is arranged at a seal position separated from the conveying apparatus 22, performs heating and pressing to the overlapping part F2 of a cylindrical film, and forms a line seal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vertical seal mechanism of a bag making and packaging machine having a function of sealing an overlapping portion (vertical seal portion) of a packaging material along a conveyance direction.

  The bag making and packaging machine fills the inside of the bag with an article to be packaged such as snack confectionery while manufacturing the bag with a sheet-like packaging material, and makes the bag. Among them, in a vertical bag making and packaging machine called a pillow packaging machine, a sheet-like film material is formed into a cylindrical shape by a former and a tube, and the vertical edge of the cylindrical packaging material is continuously formed by a vertical sealing mechanism. Then, a cylindrical packaging material is formed by heat sealing (thermal welding). And after filling the inside of the cylindrical packaging material from the tube with the article to be packaged and heat-sealing across the upper end portion of the bag and the lower end portion of the succeeding bag by the horizontal sealing mechanism below the tube, the heat-sealed portion Cut the center of the (horizontal seal part) with a cutter.

  In such a vertical sealing mechanism provided in a bag making and packaging machine, a sheet-like packaging material is wound around a tube, formed into a cylindrical shape, and then vertically sealed against the packaging material that is continuously conveyed by a conveying device. The vertical heater of the mechanism is brought into contact, and the edges of the packaging material are joined to form a vertical seal portion. In order to increase the speed of bag-making packaging, a continuous vertical seal mechanism has been proposed in which a packaging material is continuously conveyed and bag-making packaging is continuously performed (Patent Document 1).

  In the continuous vertical seal mechanism disclosed in Patent Document 1, a film spring band spring is provided at a position facing a vertical heater on a tube that forms a cylindrical shape. The film is sandwiched between a vertical heater and a film-bonding strip spring, and is heated and crimped while being continuously sealed.

In addition, a mechanism for continuously forming streak seals is generally widely used in horizontal pillow machines. As an example, as shown in FIGS. 6 and 7, the film is conveyed by driving a feed roller pair 61 and a pressure roller pair 63. Here, zigzag-shaped grooves are formed in the feed roller pair 61 and the pressure roller pair 63 in order to make a line in the seal portion. A pair of heating blocks 62 in a non-contact state are installed between the feed roller pair 61 and the pressure roller pair 63. The film conveyed by driving the feed roller pair 61 and the pressure roller pair 63 is preheated by the heating block 62 and continuously sealed by the pressure bonding of the pressure roller pair 63.
Japanese Patent Laid-Open No. 5-4608

  However, in the continuous vertical seal mechanism disclosed in Patent Document 1, the shape of the seal portion formed in the packaging material is a flat lap seal shown in FIG. On the other hand, in the market of Asian countries including Japan, a vertical streak seal having a vertical streak in the vertical seal portion, that is, a pinch seal shown in FIGS. 9A and 9B is preferred.

  Further, the continuous vertical sealing mechanism disclosed in Patent Document 2 requires a drive mechanism that intermittently closes and opens the vertical heater, which increases the size of the entire bag making and packaging machine. Moreover, since the vertical seal is intermittently formed, it cannot be applied to a bag making and packaging machine that continuously performs bag making and packaging.

  Furthermore, if the streak seal forming mechanism used in the conventional horizontal pillow machine is applied to the vertical pillow machine as it is, the distance from the former part to the seal part in the vertical pillow machine is shorter than that in the horizontal pillow machine. The film is easy to meander. In addition, when the horizontal pillow machine is repeatedly started and stopped, in the case of a film having poor thermal conductivity, the length H portion in FIG. 6 is cooled because the film is cooled at the time of stop and overheating is insufficient at the time of restart. Defects occur.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vertical sealing mechanism capable of performing vertical sealing at high speed while achieving high quality of sealing in a bag making and packaging machine that performs vertical sealing continuously.

  A vertical sealing mechanism of a bag making and packaging machine according to a first aspect of the present invention is a vertical sealing mechanism of a bag making and packaging machine that continuously seals a portion of a cylindrically formed packaging material that overlaps in the vertical direction. And a vertical sealing device. The vertical sealing device forms a seal by heating and pressing the packaging material. A conveyance apparatus is arrange | positioned in the position spaced apart from the vertical seal apparatus, and conveys a packaging material continuously below.

  The vertical sealing device includes a first heating block, a second heating block, and a vibration mechanism. The first heating block and the second heating block are arranged at positions facing each other with a minute gap. The vibration mechanism is a mechanism for continuously repeating contact / non-contact between the first heating block and the second heating block.

  In this vertical seal mechanism, the vertical seal device is not only a heating means but also a pressurizing means and a seal forming means. The packaging material continuously conveyed from the conveying device is heated and pressurized by the vertical sealing device at a sealing position away from the conveying device, and a seal is continuously formed.

  In the conventional vertical seal mechanism, since the streak seal is continuously formed, the heating means and the pressurizing means are separated from each other, and both the heating and pressurizing conditions are not satisfied when the film transport is interrupted and re-transported. There is a possibility that a seal portion is generated and waste packaging material is generated.

  In the vertical sealing mechanism of the present invention, the first heating block and the second heating block are arranged at positions facing each other with a minute gap, and heat the film. The vibration mechanism pressurizes the film by continuously repeating contact / non-contact between the first heating block and the second heating block. In this way, a seal is continuously formed by satisfying both the heating and pressurizing conditions simultaneously. Here, since both conditions of heating and pressurization are satisfied at the same time, even when film conveyance is interrupted and re-conveyed, no wasteful packaging material is generated.

  The vertical sealing mechanism of the bag making and packaging machine according to the second invention is the vertical sealing mechanism of the first invention, and the vibration mechanism is constituted by a crank mechanism.

  Here, by adopting the crank mechanism as the vibration mechanism, the contact / non-contact between the first heating block and the second heating block can be continuously repeated with a simple structure.

  The vertical seal mechanism of the bag making and packaging machine according to the third invention is the vertical seal mechanism of the first invention, and the vibration mechanism is a vibrator.

  Here, by adopting a vibrator as the vibration mechanism, contact / non-contact between the first heating block and the second heating block can be continuously repeated with a simple structure.

  The vertical seal mechanism of the bag making and packaging machine according to the fourth invention is the vertical seal mechanism of the first invention, and the vibration mechanism is an ultrasonic vibrator.

  Here, by adopting the ultrasonic vibrator as the vibration mechanism, the contact / non-contact between the first heating block and the second heating block can be continuously repeated with a simple structure.

  The vertical seal mechanism of the bag making and packaging machine according to the fifth invention is the vertical seal mechanism according to the first invention, wherein irregularities are alternately arranged on the opposing surfaces of the first and second heating blocks of the vertical seal device. Longitudinal serrations are provided.

  Here, since the serrations of the vertical streaks in which irregularities are alternately arranged are provided on the opposing surfaces of the first and second heating blocks, the packaging is performed when the first heating block and the second heating block come into contact with each other by the vibration mechanism. A streak is formed in the seal portion of the material.

  A vertical sealing mechanism of a bag making and packaging machine according to a sixth aspect of the present invention is the vertical sealing mechanism of the first aspect, wherein the conveying device is provided under the vertical sealing device and is a vacuum belt.

  Here, the tension | tensile_strength of the packaging material in a sealing position can be maintained by arrange | positioning a conveying apparatus under a vertical sealing apparatus. Moreover, since a vacuum belt is employed and the entire belt surface is in surface contact with the packaging material, a stable film feed speed and feed direction can be maintained.

  According to the vertical sealing mechanism of the present invention, in a bag making and packaging machine that continuously performs vertical sealing, it is possible to form a streak on the vertical sealing surface of the packaging bag, to improve the quality of the seal, and to perform vertical sealing at high speed. It can be carried out.

  A bag making and packaging machine according to an embodiment of the present invention will be described with reference to the drawings.

[Overall configuration of bag making and packaging machine]
The bag making and packaging machine 100 is a machine that manufactures a bag by covering food such as potato chips to be packaged with a film and sealing the tubular film F vertically and horizontally. As shown in FIG. 1, the bag making and packaging machine 100 mainly includes a film supply portion (not shown) for supplying a film F as a packaging material, and a film F sent in a sheet form from the film supply portion. A forming mechanism 1 that forms the film, a pull-down belt mechanism that conveys the tubular film F (hereinafter referred to as a tubular film) downward, and a vertical sealing mechanism 2 that vertically seals the overlapping portion of the tubular film. And a horizontal sealing mechanism 3 that seals the upper and lower ends of the bag B by horizontally sealing the tubular film.

  The articles to be packaged fall into the tube 11 by a predetermined amount from a weighing machine (not shown) provided above the bag making and packaging machine 100. On the other hand, the packaging material film F is fed in a sheet form from the film supply unit, is formed into a cylindrical shape by the forming mechanism 1, is vertically sealed to the tubular film by the vertical sealing mechanism 2, and is horizontally sealed by the horizontal sealing mechanism 3. The upper and lower ends of the bag B are sealed.

<Molding mechanism 1>
The forming mechanism 1 includes a tube 11 and a former 12. The tube 11 is a cylindrical member and has upper and lower ends opened. Potato chips C weighed with a weighing machine are put into the opening at the upper end of the tube 11. The former 12 is disposed so as to surround the tube 11. The shape of the former 12 is such that the sheet-like film F fed out from the film roll is formed into a cylindrical shape when passing between the former 12 and the tube 11. Further, the tube 11 and the former 12 of the forming mechanism 1 can be replaced according to the size of the bag to be manufactured.

<Pull-down belt mechanism 13>
The pull-down belt mechanism 13 is a mechanism that adsorbs and transports the cylindrical film wound around the tube 11 and is provided behind the tube 11 when viewed from the front of the bag making and packaging machine 100 as shown in FIG. ing. In the pull-down belt mechanism 13, a belt having an adsorption function is rotated by a driving roller and a driven roller (not shown) to carry the cylindrical film downward.

<Vertical seal mechanism 2>
As shown in FIG. 1, the vertical sealing mechanism 2 applies heat and pressure to the overlapping portion (F2 in FIG. 2) of the tubular film F wound around the tube 11, and seals along the vertical direction (conveying direction). This is a mechanism for forming a portion (shaded portion F1 in FIG. 1). Further, the seal portion F1 of the packaging material formed by the vertical seal mechanism 2 has vertical stripes, and has the shape of the pinch seal of FIG.

  As shown in FIGS. 2 and 3, the vertical sealing mechanism 2 includes a vertical sealing device 21 and a conveying device 22. In FIG. 3, the vertical sealing device 21 includes a pair of metal rectangular parallelepiped first heating block 21 </ b> A and second heating block 21 </ b> B, and a crank 23 that is a vibration mechanism. The first and second heating blocks 21 </ b> A and 21 </ b> B have heating sources (not shown) and are disposed on both sides of the overlapping portion F <b> 2 of the tubular film F. A crank 23 is connected to the first heating block 21A, and the second heating block 21B is fixed. Here, since the structure of the crank 23 is a known structure such as a cantilever crank, a detailed description thereof will be omitted. The conveying device 22 is a pair of vacuum belts 22 </ b> A and 22 </ b> B, and is disposed under the vertical sealing device 21.

  4 is a perspective view of the vertical sealing device 21, and FIG. 5 is a plan view. As shown in FIGS. 4 and 5, the heating blocks 21A and 21B are arranged at positions facing each other with a minute gap, and the first and second serrations 213A are provided on the first and second facing surfaces 211A and 211B. 213B is formed.

<Horizontal seal mechanism 3>
The horizontal sealing mechanism (horizontal sealing portion) 3 is disposed under the forming mechanism 1, the pull-down belt mechanism 13, and the vertical sealing mechanism 2. The horizontal sealing mechanism 3 has a pair of sealing jaws 31 incorporating a heater. The pair of sealing jaws 31 are positioned on the front side and the rear side of the tubular film, respectively, and turn to draw a substantially D-shaped trajectory T that is symmetrical in the longitudinal direction. In the middle of turning, the tubular film is sandwiched in a state where the pair of sealing jaws 31 are pressed against each other, and pressure and heat are applied to the portions of the tubular film that are the upper and lower ends of the bag to seal.

  A cutter (not shown) is built in one of the sealing jaws 31. This cutter plays a role of separating the bag B and the subsequent tubular film Fm at the center position in the height direction of the horizontal seal portion by the seal jaw 31.

[Operation of bag making and packaging machine]
When the bag making and packaging machine 1 is operated, the packaging material film F is sent in sheet form from the film supply unit. In the forming mechanism 1, the cylindrical film wound around the tube 11 by the former 12 is conveyed to the vertical sealing mechanism 2 by the pull-down belt mechanism 13. In the vertical sealing mechanism 2, the overlapping portion F2 of the tubular film F is sent to a minute gap between the first and second opposing surfaces 211A and 211B of the first and second heating blocks 21A and 21B. At this time, the first and second heating blocks 21A and 21B heated by a heating source (not shown) serve as a heating source to heat the film sent to the minute gap between the first and second opposing surfaces 211A and 211B. .

  Further, due to the high-speed vibration of the crank 23 connected to the first heating block 21A, the first heating block 21A continuously repeats contact and non-contact with the second heating block. At this time, the first heating block 21A and the crank 23 serve as a pressurizing unit. Here, since the vertical surfaces of the first and second heating blocks facing each other 211A and 211B are provided with vertical stripe serrations, the first heating block and the second heating block are brought into contact with each other by the crank 23. At this time, a streak is formed in the seal part F1 of the packaging material.

  Furthermore, when the vertical sealing device 21 performs sealing by driving the pair of vacuum belts 22A and 22B disposed under the vertical sealing device 21, the tension of the tubular film at the sealing position can be maintained. Further, since the vacuum belts 22A and 22B are in surface contact with the packaging material film, a stable film feed speed and feed direction can be maintained.

[Features of this bag making and packaging machine]
(1)
In the continuous vertical seal mechanism disclosed in Patent Document 1, a film spring band spring is provided at a position facing a vertical heater on a tube that forms a cylindrical shape. The film is sandwiched between a vertical heater and a film-bonding strip spring, and is heated and crimped while being continuously sealed. Under the present circumstances, the shape of the seal part formed in a packaging material is a flat lap seal shown in FIG. Further, as a vertical heater, the steel belt can change the speed according to the film feed speed, and the seal pressure can be manually adjusted by an air pressure regulator. Further, the steel belt can be loaded with a stable temperature and pressure by surface contact with the entire belt surface, and a high-quality seal can be obtained. Furthermore, by making the speed of the steel belt slightly faster than the film, a very flat seal can be obtained as well as the effect of stretching the iron.

  However, among the flat seals, the lap seal shown in FIGS. 8A and 8B has a weak tear strength on the vertical sealing surface of the packaging bag, and there remains anxiety in the sealing performance. Further, in the fin seal shown in FIGS. 8C and 8D, the tear strength and the sealing performance can be improved. However, since the thickness of the sealing surface increases, the time for heat sealing becomes longer, and consequently the packaging. The time for manufacturing the bag also becomes longer.

  In addition, the following problems are involved in applying the streak seal forming mechanism used in the conventional horizontal pillow machine to the vertical pillow machine as it is.

  First, in the horizontal pillow machine, the film is conveyed linearly from the film roll to the seal portion, there is little fluctuation of disturbance factors such as frictional resistance, and the film is easy to go straight without meandering. However, in the vertical pillow machine, the film path is bent at the former part and is not a linear mechanism, and meandering is likely to occur due to a change in sliding force due to the elasticity of the film, the finish of the former, and the like. In addition, when forming a cylindrical film from a flat film with a vertical pillow machine, the longer the distance from the former part to the seal part, the easier it is to form stably from the bag forming side. An increase in the distance to the section leads to an increase in the falling distance of the article, which is a harmful effect of high-speed operation. Therefore, in the vertical pillow machine, the distance from the former part to the seal part is shorter than in the horizontal pillow machine, and the film is easy to meander.

  Next, as shown in FIG. 7, the film is transported by the collaborative action of the four rollers of the pull-down belt 65, the feed roller pair 61, and the pressure roller pair 63, and these rollers 61 and 63 are parallel to each other. High-precision adjustment is required to synchronize the degree and feed speed and the speed of the pull-down belt 65. Further, since the former and the tube of the vertical pillow packaging machine are made of sheet metal and have errors, it is difficult to ensure the roundness of the tube itself, the film flutters, and the meandering occurs.

  Furthermore, when starting and stopping are repeated, in the case of a film with poor thermal conductivity, the portion of length H in FIG. 6 cools down when stopped, resulting in insufficient sealing due to insufficient overheating when restarting. .

  On the other hand, in the above embodiment, as shown in FIGS. 1 and 2, the vertical sealing mechanism 2 of the bag making and packaging machine 100 includes the vertical sealing device 21 and the conveying device 22. Here, the vertical sealing device 21 is disposed at a sealing position away from the conveying device 22, and heats and presses the overlapping portion F <b> 2 of the tubular film F and forms a seal. In this vertical sealing mechanism 2, the vertical sealing device 21 is not only a heating means but also a pressurizing means and a seal forming means. The packaging material continuously conveyed from the pull-down belt 13 is heated and pressurized by the vertical sealing device 21 at a sealing position away from the conveying device, and a seal is continuously formed.

  In the conventional vertical seal mechanism, since the streak seal is continuously formed, the heating means and the pressurizing means are separated from each other, and both the heating and pressurizing conditions are not satisfied when the film transport is interrupted and re-transported. There is a possibility that a seal portion is generated and waste packaging material is generated. In the vertical seal mechanism 2 of the present embodiment, there is no seal location where both the heating and pressurization conditions are not satisfied at the same time, so no waste packaging material is generated even when the film transport is interrupted and transported again.

(2)
In the vertical sealing mechanism 2 of the bag making and packaging machine 100 according to the present embodiment, the vertical sealing device 21 includes a first heating block 21B and a second heating block 21A having a heating source therein, and a crank 23. Further, as shown in FIGS. 4 and 5, the heating blocks 21A and 21B are arranged at positions facing each other with a minute gap, and the first and second opposing surfaces 211A and 211B have first and second opposing surfaces. Serrations 213A and 213B are formed. Further, due to the high-speed vibration of the crank 23 connected to the first heating block 21A, the first heating block 21A continuously repeats contact / non-contact with the second heating block.

  Here, the overlapping portion F2 of the tubular film F is continuously sent to the gap between the heating blocks 21A and 21B arranged to face each other. At this time, the first heating block 21A and the crank 23 serve as a pressurizing unit. Here, since the vertical surfaces of the first and second heating blocks facing each other 211A and 211B are provided with vertical stripe serrations, the first heating block and the second heating block are brought into contact with each other by the crank 23. At this time, a streak is formed in the seal part F1 of the packaging material.

(3)
In the vertical sealing mechanism 2 of the bag making and packaging machine 100 of the present embodiment, a pair of vacuum belts 22 </ b> A and 22 </ b> B are disposed under the vertical sealing device 21. When the vertical sealing device 21 performs sealing, the tension of the tubular film at the sealing position can be maintained by the pair of vacuum belts 22A and 22B. Further, since the vacuum belts 22A and 22B are in surface contact with the packaging material film, a stable film feed speed and feed direction can be maintained.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, although the example of the crank 23 was mentioned and demonstrated as a vibration mechanism, this invention is not limited to this.

  For example, the type of vibration mechanism is not limited as long as it is a mechanism that continuously repeats contact / non-contact between the first heating block and the second heating block, such as a vibrator or an ultrasonic vibrator.

(B)
In the above embodiment, the second heating block 21B is fixed and the crank 23 is connected to the first heating block 21A. However, the present invention is not limited to this.

  If the vibration mechanism is provided in both the first heating block 21 and the second heating block 21B and the contact / non-contact between the first heating block and the second heating block is continuously repeated, the same as above An effect can be obtained.

(C)
In the above-described embodiment, the pair of vacuum belts 22A and 22B are provided as the conveying device, but a pair of rotating rollers may be provided instead of the vacuum belt.

(D)
In the above embodiment, the pair of vacuum belts 22A and 22B are provided as the conveying member of the vertical seal mechanism. However, instead of the pair of vacuum belts, only one vacuum belt may be provided.

  Further, the vertical sealing mechanism itself does not have a separate packaging material conveying member, and the packaging material can be continuously conveyed by a conveying member unique to the bag making and packaging machine such as a pull-down belt.

  The longitudinal sealing mechanism of the bag making and packaging machine of the present invention has a function of continuously longitudinally sealing the overlapping portions of the packaging material along the conveying direction and forming a line on the sealing surface of the packaging material. Therefore, it can be widely applied to the vertical sealing mechanism of the bag making and packaging machine.

Schematic which shows the structure of the bag making packaging machine which concerns on one Embodiment of this invention. The side view of the vertical seal | sticker mechanism of FIG. The front view of the vertical seal | sticker mechanism of FIG. The perspective view of a vertical sealing apparatus. The front view of a vertical sealing apparatus. The front view of the conventional vertical seal mechanism. The side view of the conventional vertical seal mechanism. Schematic of a seal formed by a conventional vertical seal mechanism. Schematic of a seal formed by a vertical seal mechanism according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forming mechanism 11 Tube 12 Former 13 Pull-down belt mechanism 2 Vertical sealing mechanism 21 Vertical sealing device 21A 1st heating block 21B 2nd heating block 211A 1st opposing surface 211B 2nd opposing surface 213A 1st serration 213B 2nd serration 22 Vacuum type Belt 23 Crank 31 Seal jaw F Packaging material film F1 Heat seal part F2 Overlapping part B Bag

Claims (6)

In the vertical sealing mechanism of the bag making and packaging machine that continuously seals the overlapping portion of the packaging material formed in a cylindrical shape in the vertical direction,
A vertical sealing device that heats and pressurizes the packaging material to form a seal;
A conveying device that is arranged at a position spaced apart from the vertical sealing device and conveys the packaging material continuously downstream;
With
The vertical sealing device continuously performs contact / non-contact between the first heating block and the second heating block, and the first heating block and the second heating block, which are disposed at positions facing each other with a minute gap. A vertical sealing mechanism for a bag making and packaging machine, comprising: The vibration mechanism is a crank mechanism.
The vertical sealing mechanism of the bag making and packaging machine according to claim 1. The vibration mechanism is a vibrator.
The vertical sealing mechanism of the bag making and packaging machine according to claim 1. The vibration mechanism is an ultrasonic vibrator.
The vertical sealing mechanism of the bag making and packaging machine according to claim 1. On the opposing surfaces of the first and second heating blocks of the vertical sealing device, serrations of vertical stripes in which irregularities are alternately arranged are provided,
The vertical sealing mechanism of the bag making and packaging machine according to claim 1. The transport device is a vacuum type transport belt provided under the vertical seal device.
The vertical sealing mechanism of the bag making and packaging machine according to claim 1.

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