JP2004345707A - Pillow packer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pillow packer that securely forms seals despite high speed rotation. <P>SOLUTION: The pillow packer performs a packing process by use of a strip-like film 21 in which the part to be sealed at the center and the part to be sealed at the end are covered with part coating. The pillow packer has a preheating device 40 upstream of an end sealing device 30 in order that an end sealing process is performed while the part coating that covers at least the part to be sealed at the end is heated. The preheating device includes a hot air current producing device 41 that produces a hot air current, and injection boxes 43 and 45 that jet a hot air current, produced by the hot air current producing device, toward a tubular film 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pillow packaging machine.
[0002]
[Prior art]
As is well known, a pillow wrapping machine forms a tubular film by forming a band-like film into a tubular shape through a bag-making machine, and sealing the overlapped end of the film with a center sealer. In order to supply the packaged objects at predetermined intervals by the packaged product supply device installed on the upstream side into the bag making device, that is, the cylindrical film, the packaged objects were arranged at equal intervals in the cylindrical film. It will be transported in a state. Then, the tubular film is sealed and cut so as to traverse the tubular film at predetermined intervals at a predetermined interval by a rotary end seal device arranged on the carry-out side of the pillow packaging machine, thereby enclosing the packaged object. The body is manufactured.
[0003]
By the way, various films are used as the packaging material according to the purpose of use and application. In many cases, a laminate film formed by laminating a plurality of different film materials, transparent or non-transparent, is used. However, even though it is transparent, since a plurality of layers are laminated, transparency and visibility are reduced. In particular, the innermost layer of the film is required to be a film material having a sealing function that is melted by heat because the predetermined portions are in contact with each other and heat-sealed, and the film material having such a sealing function is inferior in transparency. . Therefore, when the state of the packaged object is to be visually recognized from the outside, the packaged object becomes slightly cloudy due to the influence of the transparency of the film material.
[0004]
Therefore, in recent years, as shown in FIG. 1, a packaging process is performed by using a band-shaped film 21 provided with a part coat serving as an adhesive layer only in the end seals and the center seal portions 21 b and 21 c. 2. As shown in FIG. 3, most of the film portions 21a constituting the package 34 are non-adhesive and highly transparent film materials having no part coat, so that the packaged object 14 can be easily and reliably externally provided. You can see it.
[0005]
Since the part coat has a weak adhesive force, it is usually used to provide an easy open structure for easy opening as shown in Patent Documents 1 and 2. It is not known whether there is a known document that discloses a structure used for improving the visibility described above.
[0006]
[Patent Document 1]
JP-A-62-28347 [Patent Document 2]
JP-A-57-104560
[Problems to be solved by the invention]
However, the conventional device described above has the following problems. That is, the part coat has a property of being weak in adhesive strength and easily peeling. By utilizing this property, the above-described easy-open structure is formed. However, in the case where a package is manufactured in order to improve the internal visibility presupposed by the present invention, the parts 21b and 21c of the part coat are firmly fixed. Must be glued. Then, by applying pressure to the part coat while heating it for a certain period of time or more, a certain degree of sealing strength can be obtained.
[0008]
However, when the operation speed of the packaging machine increases and the number of products manufactured per unit time increases, the time during which the sealer surface of the rotary end seal device contacts the film and pressurizes while heating is shortened. In this case, the part coat cannot be reliably heat-sealed, and there is a possibility that sealing failure may occur.
[0009]
The present invention has been made in view of the above background, and an object of the present invention is to solve the above-described problems and to provide a pillow wrapping machine that can reliably seal even at high speed rotation. .
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, in the present invention, a packaging machine main body and a packaged object supply device for sequentially supplying a packaged object to the packaging machine main body are provided, and the packaging machine main body includes a raw material roll. A bag-making device that forms a continuous strip of film from a bag into a tubular shape, and heat-sealing the film-polymerized end where both side edges of the tubular film formed into a tubular shape are overlapped by the bag-making device. A pillow packaging machine including a center seal device to be disposed and an end seal device disposed downstream of the center seal device and thermally sealing a predetermined portion of the tubular film in a lateral direction, wherein the band-shaped film is Using a center seal and a part coat applied to the end sealing part, providing a preheating device upstream of the end sealing device, and providing at least the part provided at the end sealing part It was heated configured to be able to over root section. The cutter means for cutting the end seal portion may be integrated into the end seal device, or may be formed as a separate member.
[0011]
Since the part coat portion is heated by the preliminary heating device immediately before reaching the end sealing device, heat sealing can be reliably performed even if the high-speed operation is performed and the heat treatment time in the end sealing device is short.
[0012]
The preheating device may be configured to include hot air generating means for generating hot air, and injection means for blowing hot air generated by the hot air generating means toward the cylindrical film. By blowing hot air, heating can be performed with a simple configuration.
[0013]
Further, it is preferable that the spraying means be provided at four positions on the upper, lower, left and right sides of the tubular film. In this way, hot air can be blown to the entire periphery of the cylindrical film, and the entire film portion to be end-sealed by the next-stage end sealing device can be heated. Therefore, the end seal can be reliably performed.
[0014]
In the vicinity of the upstream side of the end seal device, a transport belt device that transports the tubular film including the article to be packaged is provided, and the ejection unit is mounted in the transport belt device, and the ejection unit is provided. The hot air blown from above can be blown to the cylindrical film located above the transport belt device by passing through the transport belt device. In addition, above the vicinity of the upstream side of the end sealing device, a holding belt device for holding the tubular film containing the article to be packaged is provided, and the ejection unit is mounted in the holding belt device, and The hot air jetted from the jetting means can be made to pass through the conveyor belt device and be blown to the cylindrical film located thereunder.
[0015]
Conveyor belt devices and holding belt devices are often installed in conventional pillow wrapping machines, and by incorporating them into existing measures, the overall length of the device becomes longer even if a nominal heating device is provided. Increase in size can be suppressed. It is also easy to incorporate a pre-heating device as an optional retrofit to existing pillow packaging machines.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 4 shows a preferred embodiment of the present invention. The pillow packaging machine 10 has a packaged object supply device 11, a packaging machine main body 12, and a carry-out conveyor device 13 arranged in this order from the upstream side.
[0017]
The packaged article supply device 11 transports the packaged articles 14 at regular intervals, and sequentially supplies the packaged articles 14 to the next-stage packaging machine main body 12, and is formed of a finger conveyor device. That is, a push finger 17 is attached at regular intervals to an endless chain 16 spanned between a driving sprocket 15 and a driven sprocket 15 'arranged in front and rear. Then, by supplying the packaged object 14 between the front and rear pushing fingers 17, the packaged object 14 is transported at the finger pitch of the pushing fingers 17. Then, the first motor M1 is linked to the front drive sprocket 15 directly or via a power transmission mechanism, and the driving sprocket 15 and thus the pushing finger 17 operate at a predetermined speed by the rotational force of the first motor M1. The first motor M1 is a servo motor, and is capable of increasing and decreasing the rotation speed.
[0018]
The packaging machine main body 12 is configured to guide the strip-shaped film 21 continuously drawn from the raw roll 20 to a bag-making machine 24 while hanging the strip-shaped film 21 over a predetermined roller 22. By passing through, a bag is formed into a cylindrical shape. In the drawing, only one roller 22 is shown for convenience, but a plurality of rollers may be arranged as necessary. The mechanism for holding the material roll 20 is provided with a second motor M2, and the rotational force of the second motor M2 is applied to a rotating shaft for holding the material roll 20.
[0019]
Then, the rotation speed of the second motor M2 is reduced as the belt film 21 is fed from the web roll 20 and the outer diameter of the web roll 20 is reduced, so that the transport speed of the fed belt film 21 becomes constant. Is controlled as follows. Since various conventionally known control algorithms for deceleration can be used, a detailed description thereof will be omitted here. In addition, here, the description has been made such that the belt-shaped film 21 is transported at a constant speed.
[0020]
In addition, the unloading end of the above-described packaged article supply device 11 is located in the bag making device 24, whereby the packaged articles 14 carried out at predetermined intervals from the packaged article supply device 11 are bag-formed. It is supplied at predetermined intervals into the container 24 and thus into a tubular film 25 made into a tubular shape. In other words, the number of rotations of the first motor M1 is controlled so as to supply the packages 14 to the predetermined position of the tubular film 25 at the predetermined pitch. It should be noted that the speed control is not a main part of the present invention, but various types can be used, and therefore detailed description thereof will be omitted.
[0021]
A transfer belt 18 is disposed below and upstream of the bag making device 24. As a result, the packaged article 14 carried out of the packaged article supply device 11 is conveyed on the crossover belt 18 without falling, and can be smoothly moved into the bag making machine 24.
[0022]
On the downstream side of the bag making device 24, a transport path for the cylindrical film 25 including the article 14 to be packaged is provided, and the film transport roller 23, the center sealing device 26, A lower conveying belt device 28 and a product holding belt device 29 are disposed, and an end seal device 30 is disposed in front of the lower conveying belt device 28 in the traveling direction.
[0023]
Then, the film transport roller 23 is rotated by the rotational force of the third motor M3. The third motor M3 is configured to rotate at a constant speed, and the rotation speed is set to be equal to or slightly higher than the film sending speed (conveying speed of the belt-like film 21) by the second driving motor M2. Have been.
[0024]
The center seal device 26 seals a film overlapped end of the tubular film 25, that is, a portion where both side edges of the belt-shaped film 21 are overlapped. In the present embodiment, as shown in FIG. 1, the band-shaped film 21 has a configuration in which a part coat is applied to the center-sealing portion 21b and the end-sealing portion 21c of the transparent film 21a. As a result, the central portion where the part coat is not provided has high transparency, and when the package is finally formed, the article to be packaged 14 can be seen clearly (a cloudy feeling generated when the transparency is low is produced. Absent).
[0025]
The center seal device 26 may use, for example, a pair of left and right rectangular heating plates 26a and a pressure roller 26b disposed downstream of the heating plates 26a. The reason why the rectangular heating plate 26a is used in this way is to increase the heating time for the part-coated percoat portion 21b which is the film overlapped end on both side edges of the tubular film 25. Thereby, even if a high-speed operation of, for example, about 200 pieces per minute is performed, the part coat portion 21b parallel to the film transport direction can be reliably sealed.
[0026]
When a rotary heating roller is used, a pair of right and left rollers may be used. However, preferably, for example, one roller has a relatively large diameter and the other has a plurality of small diameter rollers (for example, two rollers). ), The same portion of the film overlap end is heated and pressed a plurality of times, and the part coat portion 21b can be reliably sealed.
[0027]
Further, the product holding belt device 29 is arranged on the front side of the end seal device 30 to suppress the packaged object 14 from rising upward. As a result, the predetermined position of the tubular film 25 (the portion where the packaged object 14 does not exist) is properly sealed and cut by the end sealing device 30, thereby preventing the packaged product 14 from being bitten.
[0028]
Further, the above-described product holding belt device 29 and lower transport belt device 28 are each provided with pulleys 29a, 28a arranged at predetermined intervals in front and rear, and a plurality of belts 29b, wrapped between the pulleys 29a, 28b. 28b. As shown in FIGS. 5 and 6, a predetermined gap is formed between the plurality of belts 29b and 28b. The upper holding belt 29 and the lower transport belt 28 also receive a driving force from the third motor M3.
[0029]
The end seal device 30 is configured by attaching an end sealer 32 to rotating shafts 31 arranged vertically, and the pair of end sealers 32 synchronously rotates by receiving the rotational force of the fourth motor M4, and A predetermined portion of the film 25 is sandwiched from above and below, and sealed and cut. As a result, the leading end portion of the tubular film 25 (the portion including the leading packaged object 14) is separated, and the package 34 is manufactured. Then, the package 34 is transported on the unloading conveyor device 13. The unloading conveyor device 13 is also driven to rotate by receiving the rotation force of the third motor M3.
[0030]
Here, the preheating device 40 according to the present invention is disposed near the upstream side of the end seal device 30. As a specific configuration, it includes a hot air generator 41 and an injection mechanism 42 for blowing the hot air generated by the hot air generator 41 onto the outer peripheral surface of the tubular film 25. Then, the hot air (for example, about 200 to 230 ° C.) jetted from the jetting mechanism 42 hits the outer peripheral surface of the tubular film 25, so that the hitting film portion is heated. Therefore, the part coat is heated by the hot air, and is heated and sealed there by the end seal device 30 of the next stage while the heated state.
[0031]
As shown in FIGS. 5 and 6, the injection mechanism 42 includes a lower injection box 43, an upper injection box 44, and side injection boxes 45 arranged on the left and right sides. Each of the injection boxes 43 to 45 is a duct (not shown). Is connected to the hot air generator 41 of FIG.
[0032]
The lower injection box 43 has a configuration in which an elongated opening 43b is formed on the upper surface of a hollow main body 43a having a flat rectangular box shape, and a connecting pipe 43c is provided on a side surface. Then, the main body 43a is inserted and arranged in the lower transport belt device 28. One end of the duct is attached to the connecting pipe 43c. As a result, the hot air output from the hot air generator 41 reaches the inside of the lower injection box 43 via the duct, and is injected to the outside from the opening 43b on the upper surface. Moves upward from the gap between the belts 28b and hits the outer peripheral surface (lower) of the tubular film 25 moving on the lower conveyor belt device 28, and heats the film portion.
[0033]
Similarly, the upper injection box 44 employs a configuration in which an elongated opening is formed on the lower surface of a flat rectangular box-shaped hollow main body 44a and a connecting pipe 44c is provided on a side surface. Then, the main body 44a is inserted and arranged in the product holding belt device 29. One end of the duct is attached to the connection pipe 44c. Thereby, the hot air output from the hot air generating device 41 reaches the inside of the upper injection box 44 via the duct, and is jetted to the outside from the opening on the lower surface, and the jetted hot air is fed to the belt of the product holding belt device 29. It moves downward from the gap between the 29b and hits the outer peripheral surface (upper) of the cylindrical film 25 which moves below the product holding belt device 29, and heats the film portion.
[0034]
Further, the side injection box 45 has a configuration in which a plurality of circular openings 45b are provided on the inner side surface of an elongated hollow main body 45a having a flat L-shape, and a connecting pipe 45c is provided at a predetermined position on the lower surface thereof. Then, the main body 45a is installed on both sides of the space between the lower transport belt device 28 and the product holding belt device 29 so that the openings 45b face each other. One end of the duct is attached to the connection pipe 45c. Thus, the hot air output from the hot air generator 41 reaches the left and right side jet boxes 45 through the duct, and is jetted to the outside from the opening 45b on the inner face. It hits the outer peripheral surface (left and right side surfaces) of the tubular film 25 located between the boxes 45 and heats the film portion.
[0035]
Thus, when the tubular film 25 moves in the space sandwiched between the lower transport belt device 28 and the product holding belt device 29, hot air blows out from the four sides and hits the tubular film 25, so that the tubular film 25 crosses the belt-like film. The formed part coat portion (all around the cylindrical film 25) 21c is heated, and the heated part coat portion 21c is end-sealed by the end seal device 30, so that the end seal device is operated even at a high speed operation. Even if the time of the sealing process at 30 is short, the heat sealing is surely performed, and the sealing failure does not occur.
[0036]
Since the lower conveying belt device 28 and the product holding belt device 29 have been conventionally provided, the hot air injection boxes 43 to 45 may be arranged at the installation positions of the respective belt devices 28 and 29 and around them. In addition, the entire packaging machine does not become large.
[0037]
In the above-described embodiment, the lower conveying belt device 28 and the product holding belt device 29 are each configured by a plurality of belts 28b, 29b. However, for example, a single sheet-shaped belt is provided with a large number of through holes. Various configurations can be adopted in addition to those. In addition, the shape of the injection box and the size, shape, and number of the openings provided therein are arbitrary.
[0038]
Further, it is most effective and preferable that four jet boxes are installed as in the above-described embodiment and hot air is blown from all sides to the tubular film 25, but it is not always necessary to blow hot air from all sides. Of course, the number of injection boxes to be installed may be reduced (for example, only the upper and lower injection boxes 44 and 43 are installed).
[0039]
【The invention's effect】
As described above, in the pillow packaging machine according to the present invention, the end sealing process is performed in a state where the end seal is preheated by the preheating device, so that the seal can be reliably sealed even at high speed rotation.
[Brief description of the drawings]
FIG. 1 is a view showing a strip film to which the present invention is applied.
FIG. 2 is a plan view showing an example of a package manufactured using the belt-shaped film shown in FIG.
FIG. 3 is a bottom view showing an example of a package manufactured using the belt-shaped film shown in FIG.
FIG. 4 is a diagram showing an embodiment of a pillow packaging machine.
FIG. 5 is an exploded perspective view showing an example of a preheating device.
FIG. 6 is a perspective view showing an example of a preheating device.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 pillow packaging machine 11 package supply device 12 packaging machine main body 13 unloading conveyor device 14 packaged product 15 driven sprocket 15 ′ driven sprocket 16 endless chain 17 pushing finger 18 transfer belt 20 raw roll 21 strip film 21 a film 21 b part coat Part 21c Part coat part 22 Roller 23 Film transport roller 24 Bag making device 25 Cylindrical film 26 Center seal device 26a Heating plate 26b Pressure roller 28 Lower transport belt device 29 Product holding belt device 30 End seal device 31 Rotary shaft 32 End sealer 34 Packaging 40 Preheating device 41 Hot air generator 42 Injection mechanism 43 Lower injection box 43a Main body 43b Opening 43c Connecting pipe 44 Upper injection box 44a Main body 44c Connecting pipe 45 Side injection box 45a Body 45b Opening 45c Connecting pipe

Claims (5)

A packaging machine main body, comprising a packaged article supply device that sequentially supplies the packaged articles to the packaging machine body,
The packaging machine body,
A bag making device for forming a tubular film from a web roll continuously drawn out of a web roll,
A center sealing device for heat-sealing the film overlapped end where both side edges of the tubular film made into a tubular shape by the bag making device are overlapped,
A pillow packaging machine that is disposed downstream of the center sealing device and includes an end sealing device that thermally seals a predetermined portion of the tubular film in a lateral direction,
The band-shaped film, using a part-coated center seal and a part to be end-sealed,
A pillow wrapping machine, wherein a preheating device is provided upstream of the end sealing device, and at least the part coat portion provided at the end sealing portion can be heated. The preheating device, a hot air generating means for generating hot air,
The pillow packaging machine according to claim 1, further comprising: an injection unit that blows the hot air generated by the hot air generation unit toward the cylindrical film. The pillow wrapping machine according to claim 1 or 2, wherein the spraying means is provided at four positions on an upper side, a lower side, and both right and left sides of the tubular film. In the vicinity of the upstream side of the end seal device, a transport belt device that transports the tubular film including the packaged object is provided,
The injection unit is mounted in the transport belt device, and the hot air injected from the injection unit is blown onto the cylindrical film located above the transport belt device through the transport belt device. The pillow packaging machine according to any one of claims 1 to 3, characterized in that: Above the vicinity of the upstream side of the end seal device, a suppressing belt device for suppressing the tubular film including the packaged object is provided,
The ejecting unit is mounted in the holding belt device, and the hot air ejected from the ejecting unit is blown onto the cylindrical film located below the conveying belt device through the conveying belt device. The pillow packaging machine according to any one of claims 1 to 4, characterized in that:

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