JP7366451B2 - Original film rewind roll - Google Patents

Description

The present invention is a method of unwinding the film material, in which a film material made by winding a band-shaped plastic film is attached to a roll body, and the plastic film is continuously rewound from the film material as the roll body rotates. Regarding roles .

Conventionally, we have been able to automatically fill and package items such as liquids, viscous substances, powders and granules such as food and beverages, seasoning liquids, pharmaceuticals, and chemicals while forming strips of plastic film into bags. However, a vertical filling and packaging machine is known, for example, as disclosed in Patent Document 1, which can continuously manufacture a plurality of packaging bags.

In this vertical filling and packaging machine, a strip-shaped plastic film is guided from an original film formed by winding the plastic film into a roll through a film guide mechanism to a bag making guide which is a film folding mechanism. The plastic film is folded in two along the longitudinal direction, and then sent out while being sandwiched by a vertical sealing mechanism (pair of vertical sealing rolls), and heat-sealed to vertically seal the plastic film into a cylindrical shape. Then, the cylindrical plastic film is heat-sealed in the lateral direction by a lateral sealing mechanism (a pair of lateral sealing rolls) to form a lateral sealing section that will become the bottom of the packaging bag, and then a bottomed tube is formed. A filling nozzle fills the plastic film with a liquid or viscous substance, and the transverse sealing mechanism transversely seals the bag opening side of the packaging bag to form a continuous packaging bag. configured to form.

Japanese Patent Application Publication No. 6-8906

The above-mentioned vertical filling and packaging machine usually uses a film material made by winding a band-shaped plastic film around a core tube made of paper or the like to a predetermined length of 1,000 m, 2,000 m, etc., and the plastic film is consumed. When the original film runs out, it is configured so that filling and packaging can be performed continuously by replacing it with a new original film.

Such a raw film is wound while applying a stronger tension to the plastic film closer to the winding core so that the core tube does not come off during handling or use. Therefore, in the filling and packaging machine, meandering tends to occur as the plastic film is rewound, and especially when replacing the original film, it is necessary to replace the used original film with the plastic film that has no tension at all. When joining together a new original film under tension, there was a risk that the plastic film would meander significantly. For this reason, conventionally, production of the filling and packaging machine had to be temporarily stopped each time the original film was replaced, and workers had to set the production conditions while performing a trial run using a new original film. In addition to decreasing performance, there were also problems in terms of cost.

In addition, in the above-mentioned vertical filling and packaging machine, when the strip-shaped plastic film is folded in half along the longitudinal direction by the bag-making guide, if the folding position deviates from the center position in the width direction of the plastic film, when the plastic film is folded There is a risk that the side edges may not be aligned with each other, resulting in so-called misalignment. Therefore, during test runs, workers had to adjust the position of the bag-making guide to match the center position of the plastic film in the width direction in order to prevent the edges from shifting, but this was extremely time-consuming and Even if the adjustment is made once, the center position may shift due to the meandering of the plastic film involved in rewinding, resulting in misalignment of the edges. Moreover, conventionally, the center position in the width direction of the plastic film was calculated from the width of the core tube of the original film, but there was an error between the width of the core tube and the plastic film, making it difficult to specify the exact position. could not.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a film rewind roll that can reduce the meandering of a plastic film during unwinding and can stably produce packaging bags with reduced selvage.

In order to achieve the above object, the present invention provides a method for sequentially unwinding a strip-shaped plastic film from a film roll wound into a roll , and unwinding the strip-shaped plastic film for feeding it into a vertical filling and packaging equipment. It is a roll,
A roll body that holds the film base material and is rotatably supported via a bearing is connected to the shaft end of the roll body, and moves the roll body along with the film base material along the axis of the roll body. a detection means for detecting the center position in the width direction of the strip-shaped plastic film immediately after being rewound; The roll is moved along the axis of the roll body so that the center position in the width direction of the strip-shaped plastic film involved in unwinding coincides with the center of engagement of the pair of vertical seal rolls constituting the vertical filling and packaging equipment. the roll body has the moving means at one shaft end and at least one of a braking means and a driving means for adjusting the rotational speed of the roll body at the other shaft end. This is a rewinding roll for an original film, characterized in that it has the following features.

Further, in the unwinding roll of the film original fabric of the present invention, the film original fabric has the strip-shaped plastic film wound around the outer surface thereof, and the through-hole portion formed inside the film roll. It is preferable to have an annular body adapted to the trunk portion of the main body and rotatable in synchronization with the rotation of the roll main body.

According to the film rewinding roll according to the present invention, the center position in the width direction of the plastic film immediately after being rewound from the film original is detected by a detection means such as a CCD camera or a sensor. According to the obtained information, the position of the plastic film unwound from the film base is determined by moving the film base using the moving means so that the center position in the width direction of the plastic film passes through a predetermined position (set value). Misalignment (meandering) can be automatically adjusted without the need for workers.

In particular, according to the present invention, when replacing the original film, the positioning of the plastic film unwound from the original film can be performed without stopping the filling and packaging machine, thereby improving productivity. In addition, it is possible to reduce manufacturing costs by saving labor.

Further, according to the present invention, the center position in the width direction of the strip -shaped plastic film immediately after being rewound from the original film is detected by the detection means , and the original film is adjusted according to the information obtained by the detection means. By moving the center position of the strip- shaped plastic film in the width direction to match the center of the machine constituting the vertical filling and packaging equipment, the meandering of the strip- shaped plastic film can be adjusted while filling and packaging the packaging bag. In addition, when the strip-shaped plastic film is folded in half in the longitudinal direction at the center position in the width direction, it can be folded back accurately and no slippage occurs.

Further, according to the present invention, without making any improvements to the filling and packaging machine body of the vertical filling and packaging equipment, only the unwinding roll for sequentially unwinding the strip-shaped plastic film is used to roll out the plastic film. Since positioning (centering) can be performed, it can be retrofitted and used for existing filling and packaging machines and filling and packaging machines made by other companies, making it highly versatile.

It is a front view showing one embodiment of vertical filling packaging equipment. FIG. 2 is a right side view of the vertical filling and packaging equipment of FIG. 1; FIG. 3 is a cross-sectional view showing the structure of a rewind roll. (a) is a diagram showing the configuration of a rewind roll, and (b) is a view taken along the line AA in FIG. 4(a). FIG. 2 is a left side view of the vertical filling and packaging equipment of FIG. 1, and is a diagram illustrating the center of the machine in the vertical filling and packaging equipment. It is a figure explaining the biting center of a pair of vertical seal rolls. It is a diagram showing a reference example of vertical filling and packaging equipment.

Although the present invention can be applied to cases where packaging bags are simultaneously manufactured in one row or in multiple rows (multi-row), the following description will mainly be made using an example of single-row filling.

FIG. 1 is a front view showing one embodiment (single row filling) of the vertical filling and packaging equipment 1, FIG. 2 is a right side view of the vertical filling and packaging equipment 1 of FIG. 1, and FIG. 4 is a sectional view showing the structure of the rewind roll 12 according to the invention, FIG. 4(a) is a diagram showing the structure of the rewind roll 12, and FIG. FIG. 5 is a left side view of the vertical filling and packaging equipment 1 in FIG. 1, and is a diagram for explaining the center of the machine in the vertical filling and packaging equipment 1, and FIG. FIG. 7 is a diagram illustrating the center of engagement of the roll pair 4, and FIG. 7 is a diagram illustrating a reference example of vertical filling and packaging equipment. The present invention will be described in detail below based on examples shown in FIGS. 1 to 7.

The vertical filling and packaging equipment 1 shown in FIG. .

As shown in FIG. 2, the rewinding roll 12 mainly includes a roll main body 20 on which the original film 10 is mounted, a moving means 21 connected to the shaft end of the roll main body 20, and a transport means 21 for unwinding the original film 10. It is comprised of a detection means 22 that detects the center position in the width direction of the plastic film F immediately afterward, and a control section 23 that receives information from the detection means 22 and drives the moving means 21.

As shown in FIG. 3, the original film 10 has a paper tube 11 made of an annular body at the center in the radial direction, and the plastic film F is wound around the paper tube 11 and It is attached to the roll body 20 of the rewind roll 12. Note that the annular body formed by winding the plastic film F is not only made of paper (paper tube 11) of this embodiment, but also various types such as plastic and metal can be used.

The film structure of the plastic film F is not particularly limited as long as it has at least a base layer and a sealant layer. A plastic film F is used, which includes a base layer consisting of a base layer consisting of a polyethylene layer, and a sealant layer consisting of an unstretched polyethylene layer, a polypropylene layer, or the like. For example, a laminated plastic film formed by laminating aluminum foil, aluminum alloy foil, aluminum vapor deposited layer, and/or paper can also be suitably used.

The original film 10 is fixed to the roll body 20 of the rewind roll 12 by fitting annular stoppers 24 to both ends of the paper tube 11, and is configured to rotate integrally with the roll body 20. There is. Note that the method of fixing the film stock 10 to the roll body 20 is not particularly limited. For example, the roll body 20 has an air shaft structure, and the shaft expands or contracts in diameter, thereby fixing the film stock 10 to the roll body 20. The roll 10 can be fixed to or released from the roll body 20 via the paper tube 11, or fixed mechanically without using an air shaft (mechanical chuck).

The roll body 20 is rotatably supported at both ends by bearings 26 with respect to a rotary support part 25, and one shaft end is connected to a moving means 21 such as an electric motor, an actuator using hydraulic pressure, or air pressure. It is configured to slide (move forward and backward) along the axis by driving the moving means 21 according to commands from a control unit 23, which will be described later. Therefore, as the roll body 20 slides, the film material 10 also moves integrally with the roll body 20.

Further, a braking means or a driving means 27 may be provided at the other shaft end of the roll body 20, and by adjusting the rotation speed of the roll body 20 by the braking means or driving means 27, the rotational speed of the roll body 20 can be adjusted. The plastic film F can be fed out at a desired speed.

In addition, in this embodiment, the case where the roll main body 20 itself is moved along its axis is shown as an example, but for example, spline teeth are provided in the body part of the roll main body 20, and A spline groove that fits the spline teeth may be provided in the formed penetration part, and this may be used to slide only the film material 10 along the axis of the roll body 20. In this case, , the roll body 20 does not need to be moved along the axis. In order to slide the film material 10 along the axis of the roll body 20, for example, the stopper 24 is structured to be able to move along the axis of the roll body 20, and the stopper 24 is moved along the axis of the roll body 20 according to a command from the control unit 23. The stopper 24 may be actuated to move the original film 10 along with the paper tube 11 along the axis of the roll body 20.

Further, at a position above the film roll 10, as shown in FIG. 4, a detection means 22 is provided for detecting the widthwise center position of the plastic film F immediately after being rewound from the film roll 10. There is. Note that the detection means 22 may be of any type as long as it can detect the center position of the plastic film F in the width direction; for example, a CCD camera or various edge sensors (for example, an image sensor may be used to A method of detecting the width of a plastic film F, a method of irradiating the plastic film F with ultrasonic waves or a laser, and detecting the edge by determining what has passed through or reflected by a detector, etc.) By detecting the positions of both side edges of the film F in the width direction, the center position in the width direction can be determined.

The information detected by the detection means 22 (the center position in the width direction of the plastic film F) is transmitted to the control unit 23, and the deviation from the pre-input setting value is calculated. When the control section 23 determines that the deviation from the set value is greater than the specified range, the moving means 21 of the rewinding roll 12 is driven by a command from the control section 23, and the roll body 20 is moved to compensate for the deviation. Move the slide based on. In the case of the vertical filling and packaging equipment 1 shown in FIG. 1, the setting value input to the control unit 23 is the center position of the machine that constitutes the vertical filling and packaging equipment 1.

By sliding the roll body 20, in the vertical filling and packaging equipment 1 shown in FIG. It is automatically adjusted so as to pass through the center position, and meandering of the plastic film F traveling downstream can be effectively suppressed. Therefore, even if there is a possibility that the plastic film F may meander significantly due to a difference in tension, such as when replacing the original film 10, the plastic film F can automatically be replaced without stopping the operation of the vertical filling and packaging equipment 1. The running position of the film F can be adjusted. Note that stable adjustment can be performed by setting the detection timing (sliding of the roll body 20) by the detection means 22 to once/0.1 seconds to 10 seconds.

The machine center of the machine constituting the above-mentioned vertical filling and packaging equipment 1 refers to the position between the pair of rolls constituting the vertical seal roll pair 4 and the horizontal seal roll pair 5, respectively, as shown in FIG. 5, especially the vertical seal roll pair. 4 or the biting center of the pair of horizontal seal rolls 5. In both the vertical seal roll pair 4 and the horizontal seal roll pair 5, the gap between the pair of seal rolls is adjusted to a predetermined gap from the beginning, and when the plastic film F is not caught, the seal rolls Although they are in contact with each other, it is possible to use a device that holds the plastic film F in a predetermined gap when it is bitten, but in any case, the biting center is defined as It means the center of the gap where the plastic film F is caught.

By setting the center position of the plastic film F in the width direction so as to pass through the center position of the machine that constitutes the vertical filling and packaging equipment 1, even if the plastic film F to be used is changed, the controller 23 can There is no need to change settings, and by aligning the plastic film F with the center of the machine and feeding it out, meandering can be effectively suppressed. The occurrence of pinholes, etc.) can be suppressed.

Alternatively, without inputting a set value to the control unit 23, the detection means 22 marks the center position of the plastic film F in the width direction and the required position of the vertical filling and packaging equipment 1 (marking that coincides with the center of the machine). The roll main body 20 (original film 10) may be slid along the axis so that the center position of the plastic film F in the width direction coincides with the marking.

As described above, the adjustment (centering) of the center position in the width direction of the plastic film F by moving the original film 10 is performed by the unwinding roll 12 (the roll body 20, the moving means 21, the detecting means 22, and the control section 23). Therefore, there is no need to make any improvements to the machine body of the vertical filling and packaging equipment 1, and it can be retrofitted to the existing vertical filling and packaging equipment 1. It has the advantage of being highly versatile since it can be used with any model.

The plastic film F, whose center position in the width direction has been adjusted by moving the original film 10, is pulled up to the top roll 2 located at the top through a plurality of transport rolls by a pair of vertical seal rolls 4 having a drive mechanism. After that, the sealant layer is guided to the bag-making guide 3 located below, where the sealant layer is folded back in two in the width direction so as to face each other, and the side end (free end) 13 They overlap.

At this time, as described above, the center of the plastic film F in the width direction coincides with the center of the machine that constitutes the vertical filling and packaging equipment 1, so the bag making guide 3 moves the plastic film F to the center position in the width direction. The side edges 13 of the plastic film F can be folded back accurately, and the side edges 13 of the plastic film F can be accurately overlapped with each other, thereby suppressing the occurrence of misalignment.

The bag-making guide 3 has a guide rod 31 that is in contact with the sealant layer side of the plastic film F and guides the folding of the plastic film F. It is preferable to provide the rollers so as to coincide with the centers of the pair of rolls 4, the pair of horizontal sealing rolls 5, the pair of cooling rolls 6, and the separating means 7), particularly the center of engagement of the pair of vertical sealing rolls 4 or the pair of horizontal sealing rolls 5. As a result, the plastic film F folded back by the bag-making guide 3 is fed out in the conveying direction along the center of the machine without meandering, and the seals formed by the vertical seal roll pair 4 and the horizontal seal roll pair 5 There are no wrinkles or bends in the part, and the occurrence of seal failure can be effectively prevented.

Further, in addition to the detection means 22 for detecting the center position of the plastic film F in the width direction, a detection means is further provided in the bag making guide 3, and the deviation of the center position of the plastic film F in the width direction is detected by both of them. You can do it like this.

Next, the plastic film F is folded in the width direction so that the overlapping side edges 13 are connected to a pair of vertical seal rolls 4 (extending in parallel in the front-rear direction in the figure in a horizontal plane) at the front and rear in FIG. In the figure, only the front side located on the near side is shown.) By heating and applying pressure while rotating, the facing sealant layers are continuously fused and bonded in the longitudinal direction (vertical direction). A seal portion 15 is formed, thereby forming a cylindrical body 16.

Here, the pair of vertical seal rolls 4 has one drive motor and gear mechanism (not shown) that rotates them in opposite directions at a constant speed, and both ends of one (front side) vertical seal roll. A pair of air cylinders, for example, are provided for pressing the bearing block supporting the other vertical seal roll (on the rear side) toward the bearing block supporting the other vertical seal roll.

The pair of vertical seal rolls 4 has a seal bar 41 in the shape of a circular flange on its outer peripheral surface, and also has a built-in heater that contributes to heating the seal bar 41. The pair of vertical sealing rolls 4 press the vertical sealing roll on the front side toward the vertical sealing roll on the rear side using a pair of cylinders (not shown), thereby sealing the overlapping side edges 13 of the plastic film F into the seal bar. 41 and heated and pressurized to fuse them in the shape of palms together to form the vertical seal portion 15, and at the same time, based on the rotation of the vertical seal roll pair 4, the cylindrical body 16 is let out and travels downward in the figure. .

In this embodiment, the vertical seal roll pair 4 is provided with a driving means, but the vertical seal roll pair 4 is not provided with a driving means, and the vertical seal roll pair 4 is located at an upstream position and/or a downstream position of the vertical seal roll pair 4. A feed roll having a drive means may be provided at the position, and the plastic film F may be fed out by the feed roll.

Further, in this embodiment, a case is shown in which a packaging bag with a three-sided seal is manufactured, but when a packaging bag with a four-sided seal is manufactured, the folded part 14 of the plastic film F is attached to the pair of vertical seal rolls 4. A seal bar for sealing the position is further provided, and the pair of vertical seal rolls 4 form a vertical seal portion 15 at each of the overlapping side edge portions 13 and folded portions 14 of the plastic film F.

In addition, in the embodiment shown in FIG. 1, one plastic film F rewound from the original film 10 by one unwinding roll 12 is folded in two at the center position in the width direction as described above, and the two are overlapped. An example is shown in which the side ends are vertically sealed to form a cylindrical body, but as in the reference example shown in FIG. 7, two unwinding rolls 12 and 12' are used to attach each The two plastic films F and F' unwound from the original film rolls 10 and 10' are stacked one on top of the other, and their both ends are held between a pair of vertical seal rolls 4 while being pressurized and heated. A cylindrical body can also be formed by vertically sealing along the length. In this case, the two rewind rolls 12 and 12' are provided with moving means 21 and 21', respectively, and the detection means 22a, 22a', 22b, and 22b' detect the two plastic films F immediately after rewinding. The control section detects the conveyance path and/or the conveyance path of the two plastic films F and F' on the entrance side of the pair of vertical seal rolls 4, and based on the information from the detection means 22a, 22a', 22b, and 22b'. By moving the original films 10 and 10' using 23 and aligning the transport paths of the two plastic films F and F', it is possible to accurately overlap the two plastic films F and F'. can.
Note that the transport path of the plastic film F may be detected, for example, at the center position in the width direction or at the side edge position in the width direction of the plastic film.

The inside of the cylindrical body 16 formed as described above is continuously filled with the packaged material M supplied from the filling nozzle 8 from each unillustrated tank via an unillustrated pump and a supply path. . The packaged items M include liquid and viscous substances that do not contain solid substances, as well as liquid and viscous substances that contain grain particles such as pepper and sesame, solid substances such as meat, fish, and vegetables, and salt and viscous substances. Various materials can be used, such as powder and granular materials such as pepper, fluid solids and semi-solids (silicone, paste, etc.), food and beverages, chemicals, pharmaceuticals, and the like.

A pair of horizontal sealing rolls 5 sandwich the traveling cylindrical body 16, and while squeezing out the packed object from the filling nozzle 8 at a predetermined interval in the longitudinal direction of the cylindrical body 16, By heating and pressurizing the squeezing position to form the horizontal seal part 17, the packaging bag W whose upper and lower ends are surrounded by the horizontal seal part 17 and both side ends are surrounded by the vertical seal part 15 and the folded part 14, Bags can be made with the plastic film F connected in the longitudinal direction.

The pair of horizontal seal rolls 5 extend parallel to each other in the front-rear direction of FIG. It rotates at a constant speed. For example, the horizontal seal roll pair 5 has a plurality of heat seal bars 51 located at equal intervals on its outer peripheral surface and extending in the axial direction, and the opposing heat seal bars 51 form a cylindrical shape. By sandwiching and heating the body 16, the horizontal seal portion 17 can be formed over the entire width of the cylindrical body 16 in a direction perpendicular to the traveling direction of the cylindrical body 16.

In addition, the horizontal seal roll pair 5 performs a box motion operation that combines an opening/closing operation of approaching or moving away from the cylindrical body 16 and an up/down operation of moving up and down at regular intervals in the feeding direction of the plastic film F. Preferably. This box motion type horizontal seal roll pair 5 performs a descending operation while sandwiching the cylindrical body 16 and sealing it horizontally, so that sufficient horizontal sealing time can be secured, so that the sealing strength of the horizontal sealing part 17 is increased. Even if the plastic film F is laminated with materials such as aluminum foil or paper that inhibit heat transfer to the sealant layer, sealing failures (liquid leakage, peeling, etc.) will not occur. can be prevented.

Next, the pair of cooling rolls 6 has a plurality of seal bars 61 extending in the axial direction at the same intervals as the pair of horizontal sealing rolls 5, and the horizontal sealing portion formed by the pair of horizontal sealing rolls 5. By pressing the 17 portion with the cooled seal bar 61, the horizontal seal portion 17 can be fixed and stabilized.

Next, the packaging bags W that have been continuously made through the cooling roll pair 6 are cut in the width direction at approximately the middle position of the horizontal seal portion 17 in the traveling direction by a separating means 7 using a rotary cutter or the like, and then one by one. Alternatively, it may be cut into a plurality of required pieces, or a perforation may be made at approximately the middle position of the horizontal seal portion 17 in the running direction, and the plurality of pieces may be connected together and transported.

According to the present invention, it can be used not only in a vertical filling packaging machine but also in various packaging machines as a roll for continuously supplying a strip-shaped plastic film. Further, according to the present invention, it is possible to provide a vertical filling and packaging equipment that can efficiently manufacture packaging bags in which ear displacement is suppressed.

1 Vertical filling and packaging equipment 2, 2' Top roll 3 Bag making guide 31 Guide rod 4 Vertical seal roll pair 41 Seal bar 5 Horizontal seal roll pair 51 Seal bar 6 Cooling roll pair 61 Seal bar 7 Separating means 8 Filling nozzle 10 Film Original fabric 11 Paper tube 12, 12' Rewind roll 13 Side end 14 Folded part 15 Vertical seal part 16 Cylindrical film 17 Horizontal seal part 20 Roll body 21, 21' Moving means 22, 22a, 22a', 22b, 22b ' Detection means 23 Control part 24 Stopper 25 Rotation support part 26 Bearing 27 Braking means or driving means F, F' Plastic film W Packaging bag M Item to be packaged

Claims (2)

A rewinding roll for sequentially unwinding a strip-shaped plastic film from a film roll wound into a roll and feeding the strip-shaped plastic film to a vertical filling and packaging equipment ,
A roll body that holds the film base material and is rotatably supported via a bearing is connected to the shaft end of the roll body, and moves the roll body together with the film base material along the axis of the roll body. a detection means for detecting the center position in the width direction of the strip-shaped plastic film immediately after being rewound; The roll is moved along the axis of the roll body so that the center position in the width direction of the strip-shaped plastic film involved in unwinding coincides with the center of engagement of the pair of vertical seal rolls constituting the vertical filling and packaging equipment. It consists of a control section that changes the
The roll body has the moving means at one shaft end and at least one of a braking means and a driving means for adjusting the rotational speed of the roll body at the other shaft end. Rewind roll. The film material is made by winding the strip-shaped plastic film into a roll on its outer surface, and by adapting the through-hole portion formed on the inside to the body portion of the roll body, so that the roll body is rotated. The unwinding roll for an original film according to claim 1, characterized in that it has an annular body that can rotate in synchronization.

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