JP2018203367A - Heater bar device for packaging machine - Google Patents

Abstract

To provide a heater bar for a packaging machine capable of removing air bubbles entrapped between overlapped both side edge parts of packaging films when sealing processing both side edge parts.SOLUTION: A heater bar device 20 for a packaging machine forms a packaging film sent from the upstream side into a tubular shape, and feeds a stored article to a tubular packaging film Fw at a predetermined interval, and subjects to center seal processing overlapped side edge parts Fe and Fw of the tubular shape packaging film Fw, and after that, it is used for a packaging machine to make the bag with an end seal device. The heater bar device 20 has a pair of heater bars 21 and 22 for allowing passage of both side edge parts of the packaging film and for heating both side edge parts Fe and Fw, and the sealing heating surfaces 21a and 21a are formed into a wedge shape in which an exit side in the moving direction is widened with respect to an entrance side in the moving direction of the tubular packaging film Fw.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heater bar device for a packaging machine, and more specifically, it is possible to perform center seal processing in a state in which both side edges overlapped with a cylindrical packaging film are removed from air bubbles entrained in both side edges. The present invention relates to a heater bar device for a packaging machine.

Conventionally, in a vertical bag making filling and packaging machine and a horizontal bag making filling and packaging machine, it is formed into a cylindrical packaging material by performing center seal processing by sandwiching both side edges of a curved web-shaped packaging material, The products to be packaged are filled inside, and the products are bag-wrapped by performing a transverse end seal process on the cylindrical packaging material before and after the filled products.
Also, in the overwrapping machine, the packaging material is wrapped around the product, the overlapping edge portion of the packaging material is sandwiched, and the center seal is applied to the sandwiched both edge portions to perform packaging. Yes.

  For example, as a horizontal bag making filling and packaging machine, a band-shaped packaging film is formed into a curved shape close to a cylindrical shape by a bag making machine, and an article (product) is fed by a supply conveyor into a curved film that is fed horizontally. A portion of the packaging film to which the article is supplied is overlapped with both ends extending in the longitudinal direction and subjected to center seal processing by a center seal device, and at the position between the articles in the longitudinal direction. It is known that a pillow package is manufactured by performing end sealing and cutting in a direction crossing with respect to (for example, see Patent Document 1).

The horizontal bag making and filling and packaging machine disclosed in Patent Document 1 includes a pair of heater bars arranged to face each other in order to perform center seal processing.
This pair of heater bars is formed in a substantially rectangular parallelepiped shape with a built-in heater, and each heater bar is in an open state so as to sandwich and overlap the overlapping portions of both end edges of the packaging film. They are arranged at intervals.
Then, according to the movement of the packaging film, the overlapping portions of the both end edges of the packaging film are passed through the gaps between the heater bars, and during the passage, the overlapping portions of the packaging film are softened by applying heat with the heater. Then, the center seal is completed by clamping the overlapped portion with a pressure roller disposed at the next stage of the pair of heater bars.

A general heater bar device 100 used in a conventional horizontal bag making filling and packaging machine includes a pair of heater bars 101 and 102 as shown in FIGS. 6 (A) and 6 (B). .
Each of the pair of heater bars 101 and 102 is formed of a substantially rectangular parallelepiped main body portion 101A and 102A, and protrusions 101B and 102B that are formed on the upper inner surfaces of the main body portions 101A and 102A and face each other. Thus, the heater bars 101 and 102 are formed in a substantially gate-shaped cross section.
And the front-end | tip surface which the said protrusion parts 101B and 102B oppose becomes the heating surface 101a, 102a for a seal | sticker which heats the overlapped part of the web-shaped packaging film Fw, ie, both side edge part Fe and Fe.

In addition, the pair of heater bars 101 and 102 are disposed between the front end surfaces of the protruding portions 101B and 102B, that is, between the sealing heating surfaces 101a and 102a, with a predetermined gap c maintained. The side edge portions Fe and Fe of the web-shaped packaging film Fw pass through c along the moving direction.
As shown in FIG. 6B, the shape of the sealing heating surface 101a is such that the upper and lower surfaces 101b, 102b of the heater bars 101, 102 are arranged on both the inlet side and the outlet side of the flow of the web-shaped packaging film Fw. It is formed with a lower end surface 101c whose height from the upper end surface 101b is the same dimension H2, and is a rectangular heating surface for sealing 101a.
6B shows the sealing heating surface 101a of one heater bar 101, the sealing heating surface 102a of the other heater bar 102 is symmetrical with the sealing heating surface 101a. ing.

JP 2012-250756 A

By the way, when the center seal is applied by the sealing device as described above, the web which is applied to the roll surface of the paper pulling roll portion arranged on the upstream side of each heater bar, for example, is roughened by uneven seal eyes. Since the wrapping film enters and passes through a narrow gap between the heater bars, depending on the packaging material, sealing may be performed with air entrained, which may result in a sealing finish in which bubbles are sunk into the center seal portion.
As a result, in the case of large bubbles, there are those that can be recognized even by touching with the hand, and there is a problem that the appearance is poor and the product value is lowered. In some cases, it is determined that the product is defective and cannot be delivered.

  Here, when the both side edges where the web-shaped packaging films are overlapped pass through the gap between the pair of heater bars, the sealant used for pressure bonding is melted and tends to hang downward. And at this time, air enters between both side edges of the web-shaped packaging film, becomes a bubble, and a situation occurs in which the bubble is sealed.

However, in the heater bar device 100 shown in FIGS. 6A and 6B, the sealing heating surfaces 101a and 102a of the pair of heater bars 101 and 102 are the upper end surfaces 101b and 102b of the heater bars 101 and 102, respectively. Are formed over the entire length with the same height dimension H2, so that the entire heating surfaces 101a, 102a for sealing can come into contact with the web-shaped packaging film Fw.
Therefore, when the web-like packaging film Fw passes through the sealing heating surfaces 101a and 102a, both side edges Fe and Fe are heated by the sealing heating surfaces 101a and 102a of the heater bars 101 and 102, respectively. Bubbles entrained between Fe and Fe gather together with the melted sealant on the lower side of the sealing heating surfaces 101a and 102a.
As a result of sealing the both side edge portions Fe and Fe in this state, there is no escape space for the bubbles, and the bubbles are confined in the completed seal portion, causing the above-described problems.

(Object of invention)
The present invention has been proposed in order to solve the above-mentioned problems, and the object thereof is to remove bubbles entrained between both side edges when the side edges overlapped with each other of the packaging film are sealed. It is an object of the present invention to provide a heater bar device for a packaging machine.

In order to achieve the above object, the heater bar device for a packaging machine according to the present invention forms a packaging film sent from the upstream side in a cylindrical shape, and stores objects in the cylindrical packaging film at predetermined intervals. A heater bar device for a packaging machine for carrying out bag-making by an end seal device after feeding and center-sealing both side edges of the tubular packaging film,
A pair of heater bars that allow passage of both side edges of the packaging film and that heat to seal the side edges;
The shape of the heating surface for sealing that heats both side edges,
It is characterized by having a wedge shape in which the moving direction outlet side is wider than the moving direction inlet side of the packaging film.

According to the heater bar device for a packaging machine of the present invention, when both side edges of the packaging film pass through the gap between the heating surfaces for sealing of the pair of heater bars, air bubbles formed between the side edges are removed. Although it will be in the entrained state, it is heated by the radiant heat from the sealing heating surface as the cylindrical packaging film advances, and the sealant on both side edges melts and flows downward.
At this time, the wrapping film moves to the moving direction outlet side while the sealant extrudes the wedge-shaped air bubbles between the side edge portions and pushes it downward in the wedge shape. For this reason, the bubbles entrained between the side edges are removed. As a result, it is possible to obtain a seal portion without bubbles.

It is a whole side view which shows the horizontal type bag making filling packaging machine to which the heater bar apparatus for packaging machines which concerns on this invention was applied. It is an II arrow line view in FIG. 1, and is a top view of a horizontal type bag making filling packaging machine. 1 shows a first embodiment of a heater bar device for a packaging machine according to the present invention, FIG. 3 (A) is an overall perspective view of the heater bar device, and FIG. 3 (B) is along the line BB in FIG. 3 (A). It is a side view of the other heater bar. 4 shows a second embodiment of a heater bar device for a packaging machine according to the present invention, FIG. 4 (A) is an overall perspective view of the heater bar device, and FIG. 4 (B) is along the line BB in FIG. 4 (A). It is a side view of the other heater bar. 3 shows a third embodiment of a heater bar device for a packaging machine according to the present invention, FIG. 5 (A) is an overall perspective view of the heater bar device, and FIG. 5 (B) is along the line BB in FIG. 5 (A). FIG. 5C is a side view of the other heater bar, and is a view taken in the direction of arrow C in FIG. 5B. It is a figure which shows the conventional heater bar apparatus for packaging machines, FIG. 6 (A) is the whole perspective view of a heater bar apparatus, FIG.6 (B) is one heater along the BB line in FIG. 6 (A). It is a side view of a bar.

Below, 1st Embodiment of the heater bar apparatus for packaging machines which concerns on this invention with reference to an accompanying drawing is described.
The present invention is such that a center seal process can be performed by removing bubbles entrained between both side edges of a web-like packaging film which is a packaging film.

1 and 2 show a horizontal bag making and filling machine 1 equipped with a heater bar device (hereinafter simply referred to as a heater bar device) 20 for a packaging machine of the present invention.
First, the entire horizontal bag making and filling and packaging machine 1 will be described with reference to FIGS.
The horizontal bag making and filling machine 1 includes a film supply source 2 that rotatably loads and supports a film roll Fr around which a web-like packaging film Fw is wound, and a film roll of the film supply source 2 on the upstream side of the packaging film. And a paper feed roller 3 for feeding the web-shaped packaging film Fw from Fr.
In the present embodiment, a transparent film is used as the web-shaped packaging film Fw.

The paper feed roller 3 includes a driving side roller 3a and a driven side roller 3b that sandwich and feed the web-shaped packaging film Fw. The driving side roller 3a is appropriately driven by a servo motor 4 like a belt transmission device 4a. Driven through the missionary structure.
The web-like wrapping film Fw fed out from the paper feed roller 3 is bent until its both side edge portions are drawn toward each other by the cylinder making device 5 to become a substantially cylindrical shape.

The web-shaped packaging film Fw bent into a substantially cylindrical shape by the cylinder making machine 5 passes through the cylinder making machine 5 and then moves along the moving direction indicated by the arrow A on the plate-shaped transport surface 1B (see FIG. 2). When the sheet is sent to the center seal mechanism 6 and passes through the center seal mechanism 6, it is formed into a cylindrical packaging film Ft by being subjected to center seal processing on the overlapped side edge portions Fe and Fe.
The cylindrical packaging film Ft is manufactured into the pillow packaging body Bp by being subjected to end seal processing at a predetermined interval by the end sealer 7.
The end sealer 7 is equipped with a cutter 7a, and the pillow package Bp is individually separated by the cutter 7a.

  Further, in the horizontal bag making filling and packaging machine 1, in order to send the product P into the web-like packaging film Fw bent into a cylindrical shape by the cylinder making machine 5, a feeding conveyor 8 is arranged near the lower side of the cylinder making machine 5. It is installed. The feeding conveyor 8 is provided with pushing fingers 8a at predetermined intervals, and the product P is fed into the cylindrical web-shaped packaging film Fw at predetermined intervals according to the pitch of the pushing fingers 8a. Yes.

  In the illustrated example, the center seal mechanism 6 includes a paper drawing roller portion 10, a heater bar device 20 for heating, a pressure roller portion 30, and a weight roller portion 40 which are sequentially arranged from the upstream side of the packaging film. Configured.

The paper drawing roller unit 10 includes a pair of rollers 11 and 12 for sandwiching both side edge portions Fe and Fe on which the web-shaped packaging film Fw bent in a substantially cylindrical shape is overlapped between the respective peripheral surfaces. ing. The peripheral surface of each roller 11 and 12 is comprised by the uneven | corrugated seal eyes which were given to each roller surface, for example. However, any shape of the sealing eyes may be used.
These rollers 11 and 12 are respectively provided in a paper drawing servo motor 13 and are rotated at a speed synchronized with each other in the opposite direction by driving of each paper drawing servo motor 13.
Therefore, the web-shaped packaging film Fw is disposed immediately after the downstream side of the paper drawing roller unit 10 in a state where the both side edge portions Fe and Fe are sandwiched between the peripheral surfaces of the pair of rollers 11 and 12. Is sent to the heater bar device 20.

As shown in FIGS. 3A and 3B, the heater bar device 20 includes a pair of heater bars 21 and 22. The heater bars 21 and 22 are opposed to the heater bars 21 and 22, respectively. Between the surfaces, the gaps c through which both side edge portions Fe and Fe of the web-shaped packaging film Fw pass are secured.
Heat generating means (not shown) is embedded in the pair of heater bars 21 and 22. Therefore, radiant heat is emitted from the opposing surfaces of the heater bars 21 and 22 heated by the heating means, and both side edge portions Fe and F of the web-like packaging film Fw passing through the gap c between the heater bars 21 and 22 Fe is heated.

As shown in FIG. 3A, the pair of heater bars 21 and 22 are formed in a substantially rectangular parallelepiped shape having a full length L dimension in which both side edge portions Fe and Fe of the web-shaped packaging film Fw are long in the moving direction (arrow A). ing.
Each heater bar 21 and 22 is formed by substantially rectangular parallelepiped main body portions 21A and 22A and projecting portions 21B and 22B provided on the inner upper sides of the substantially rectangular parallelepiped main body portions 21A and 22A. The tip ends of 21B and 22B face each other. That is, both heater bars 21 and 22 are substantially gate-shaped when facing each other.
The opposing surfaces of the projecting portions 21A and 22A are used as the heating surfaces 21a and 22a for sealing, and the gap c between the heating surfaces 21a and 22a for sealing is formed on both side edge portions Fe of the web-shaped packaging film Fw. , Fe passes through.

In other words, when the heater bars 21 and 22 face each other, they are arranged in a substantially gate shape. In other words, a space S is formed in a lower region connected to the sealing heating surfaces 21a and 22a of the heater bars 21 and 22. This means that the space S has a square shape.
Therefore, when the web-shaped packaging film Fw is extruded intermittently and advances, the space S is below the heating surfaces 21a and 22a for sealing, so that the lower end portions of both side edges Fe and Fe of the web-shaped packaging film Fw. Is not interfered with anywhere, thereby enabling smooth movement of the web-shaped packaging film Fw.

As shown in FIG. 3B, the sealing heating surface 21a of the heater bar 21 is formed in a wedge shape in which the moving direction outlet side is wider than the moving direction inlet side of the web-shaped packaging film Fw.
That is, the wedge shape of the heating surface 21a for sealing is such that the upper end surfaces 21b and 22b of the heater bars 21 and 22 and the inlet side lower end surface end set at a position separated from the upper end surface 21b of the heater bar 21 by the dimension H1. A portion 21d, an outlet-side lower end surface end portion 21e set at a position separated by a dimension H2 larger than the dimension from the upper end surface 21b of the heater bar 21 to the inlet-side lower end surface end portion 21d, and an inlet-side lower end surface end portion 21d. And the outlet-side lower end surface end portion 21e.
The inlet-side lower end surface end portion 21d and the outlet-side lower end surface end portion 21e form an inclined lower end surface 21c connected by a straight line.

Here, the height dimension H1 is set to, for example, 2 to 3 mm, and the height dimension H2 is set to, for example, 13 to 14 mm. The height dimension H2 is a sealing dimension.
Further, the height dimension H3 of the side edge portions Fe and Fe of the web-shaped packaging film Fw is formed to be larger than the height dimension H2, for example, 15 to 16 mm. Therefore, a wrinkle of about 2 mm that is not sealed is provided at the ends of both side edge portions Fe and Fe.
However, the height dimension H1 is not limited to the above dimension, and may be a zero dimension, that is, the same position as the upper end surface 21b of the heater bar 21, and the height dimension H3 is not limited to the above dimension. It can set to the dimension corresponding to the kind of web-shaped packaging film Fw, and the kind of to-be-contained object accommodated inside.

  3B shows the sealing heating surface 21a of one heater bar 21 as a representative of the heating surfaces 21a and 22a for sealing of the pair of heater bars 21 and 22. FIG. The shape of the sealing heating surface 22a of the other heater bar 22 is symmetrical to the sealing heating surface 21a.

Since the heating surfaces 21a and 22a for sealing of the pair of heater bars 21 and 22 are wedge-shaped as described above, the web-shaped packaging film Fw is fed and moved as shown in FIG. When moving along the direction A, the air that has entered between the side edge portions Fe and Fe of the web-shaped packaging film Fw is entrained as bubbles and sealed together with the bubbles.
However, both side edge portions Fe and Fe of the web-like packaging film Fw are heated by heat radiation from the sealing heating surfaces 21a and 22a, so that the sealant melts and flows downward.
When this sealant flows downward, the bubbles entrained between the side edge portions Fe and Fe move while being squeezed downward, so that most of the bubbles are pushed out of the inclined lower end surface 21c, The web-like wrapping film Fw is removed from the parts Fe and Fe and has no bubbles on both side edge parts Fe and Fe, and proceeds to the next process (crimping process by the pressure roller section 30) from the outlet side of the heater bars 21 and 22. To do.
As a result, it is possible to perform a sealing process without bubbles between the side edge portions Fe and Fe of the web-shaped packaging film Fw.

The heater bar device 20 is provided with an opening / closing servo motor 23 for bringing the pair of heater bars 21 and 22 close to each other or separating them.
Then, the opening / closing servo motor 23 is driven to open and close the pair of heater bars 21 and 22, thereby, for example, the gap c between the heater bars 21 and 22 depending on the type, material, thickness, etc. of the packaging film. Adjustment can be performed easily.

Immediately after the downstream side of the heater bar device 20, a pressure roller unit 30 is disposed.
The pressure roller section 30 includes a pair of pressure rollers 31 and 32 that are arranged with their peripheral surfaces facing each other so as to sandwich both side edge portions Fe and Fe of the web-shaped packaging film Fw heated by the heater bar device 20. ing.
The pressure roller section 30 performs center seal processing by pressing the both side edge portions Fe and Fe of the web-shaped packaging film Fw heated by the heater bar device 20 between the pressure rollers 31 and 32 and pressing them. .

The bent web-shaped packaging film Fw is formed into a cylindrical packaging film Ft by performing a center seal process.
Here, since the pressure roller section 30 is not provided with a driving means, the pressure rollers 31 and 32 are not rotationally driven by power, but are pressure-bonded to both side edge portions Fe and Fe of the web-shaped packaging film Fw. Thus, it only rotates following the feed of the web-like packaging film Fw.

The pressure roller section 30 includes an opening / closing servo motor 33 for bringing the pair of pressure rollers 31 and 32 closer to each other or separating them from each other. The operation is controlled, and the addition of the pressure contact force between the side edge portions Fe and Fe by the pressure rollers 31 and 32 is adjusted.
The peripheral surfaces of the pressure rollers 31 and 32 have a smooth cylindrical surface shape with no basis weight.

Immediately after the downstream side of the pressure roller section 30, a weighted roller section 40 is disposed.
The weight roller section 40 drives a pair of weight rollers 41, 42 that sandwich both side edge portions Fe, Fe of the cylindrical wrapping film Ft that are center-sealed, and the weight rollers 41, 42. And a drive servo motor 43 for this purpose.
The weight rollers 41 and 42 are supplied with driving force from the driving servomotor 43, are rotated at a speed synchronized with each other in the opposite direction, and convey the packaging film.

The rotation speeds of the weight rollers 41 and 42 are basically synchronized with the output of the paper drawing servo motor 13 of the paper drawing roller unit 10, but the ratio can also be changed.
Circumferential grooves such as seal eyes are formed on the peripheral surfaces of the weight rollers 41 and 42, and mesh with each other with both side edge portions Fe and Fe having a center seal interposed therebetween. If it is a general film, it will be sealed just by narrowing because it is just after sealing, but it is possible to heat with a built-in heater in the case of a film that is difficult to see such as a thick packaging film It is. The end sealer 7 is disposed on the downstream side of the weight rollers 41 and 42.
Below the end sealer 7 on the downstream side, an unloading conveyor 9 for unloading the pillow package Bp that has been formed is disposed.

Next, the operation of the horizontal bag making and filling machine 1 having the above configuration will be described.
First, the web-like packaging film Fw is continuously fed out from the film roll Fr by the paper feed roller 3 and sent to the cylinder making machine 5, and when passing through this cylinder making machine 5, the web-like packaging film Fw is made. It is formed in a cylindrical shape along the inner surface shape of the cylinder 5. At this time, both side edges in the moving direction of the web-shaped packaging film Fw overlap each other.

With respect to the cylindrical packaging film Ft formed in a cylindrical shape by passing through the cylinder making machine 5, the product P as the object to be contained is fed into the cylindrical packaging film Ft at predetermined intervals by the feeding fingers 8a of the feeding conveyor 8. Supplied. And the cylindrical packaging film Ft advances in the state in which the product P was included.
The cylindrical packaging film Ft including the product P has both side edges Fe and Fe folded upward in front of the end sealer 7 and the top sealer 7 in a state where the upper side is also folded downward. The tip in the moving direction is sealed and cut.

Here, when both side edge parts Fe and Fe of the web-shaped packaging film Fw pass through the clearance c between the sealing heating surfaces 21a and 22a of the pair of heater bars 21 and 22, they enter between the both side edge parts Fe and Fe. Air bubbles are involved, but as the web-like packaging film Fw advances, it is heated by the radiant heat from the sealing heating surfaces 21a and 22a, and the sealants of the side edges Fe and Fe are melted. And move down.
The web-like wrapping film Fw moves to the exit side in the moving direction while the sealant extrudes air bubbles entrained between both side edges Fe and Fe to the lower side of the inclined surface. For this reason, since the bubbles trapped between the side edge portions Fe and Fe are removed, sealing without bubbles is possible.

According to the heater bar device 20 for a packaging machine of the first embodiment configured as described above, the following effects can be obtained.
(1) When both side edges Fe and Fe of the web-like packaging film Fw move in the gap c between the sealing heating surfaces 21a and 22a in a state where air bubbles are involved, the radiant heat from the sealing heating surfaces 21a and 22a As a result, the sealant of both side edges Fe and Fe melts and moves downward, and this sealant pushes downward in such a way as to squeeze the bubbles. Since the lower end surfaces 21c and 22c of the sealing heating surfaces 21a and 22a are formed in an inclined shape, the extruded bubbles are pushed out of the sealing heating surfaces 21a and 22a and removed. As a result, it is possible to obtain a seal portion without bubbles.

(2) The pair of heater bars 21 and 22 is formed by main body portions 21A and 22A and projecting portions 21B and 22B provided on the inner upper portions of the main body portions 21A and 22A, respectively. When facing each other, it is almost a gate type. Since the front end surfaces of the projecting portions 21B and 22B are the heating surfaces 21a and 22a for sealing, a square space S is formed in a lower region continuous with the heating surfaces 21a and 22a for sealing. Therefore, when the web-like packaging film Fw is pushed out intermittently and proceeds, the lower end portions of both side edges Fe and Fe of the web-like packaging film Fw are not interfered with anywhere, so that the web-like packaging film Fw moves smoothly. It becomes possible.

(3) Since the heater bar device 20 is provided with an opening / closing servo motor 23 for bringing the pair of heater bars 21 and 22 close to each other or separating them from each other, the opening / closing servo motor 23 is driven. Thus, the gap c between the pair of heater bars 21 and 22 can be easily adjusted. As a result, it is possible to freely cope with the type, material, thickness, etc. of the packaging film.

Next, with reference to FIG. 4, 2nd Embodiment of the heater bar apparatus for packaging machines which concerns on this invention is described.
As shown in FIGS. 4 (A) and 4 (B), the heater bar device 50 for a packaging machine according to the second embodiment has the wedge shape of the heating surfaces 51a and 52a for sealing in the pair of heater bars 51 and 52. The pair of heater bars 21 and 22 according to the first embodiment has a wedge shape different from the shape of the sealing heating surfaces 21a and 22a. Other configurations are substantially the same as those of the first embodiment.
In the heater bar device 50 for a packaging machine according to the second embodiment, the pair of heater bars 51 and 52 are formed by the main body portions 51A and 52A and the projecting portions 51B and 52B, and on the front end surfaces of the projecting portions 51B and 52B facing each other. The sealing heating surfaces 51a and 52a are formed.

As shown in FIG. 4B, the sealing heating surface 51a of the second embodiment has a deformed wedge shape as compared with the sealing heating surface 21a of the first embodiment.
In other words, the wedge shape of the sealing heating surface 51a includes the upper end surface 51b of the heater bar 51, the inlet side lower end surface end 51e set at a position away from the upper end surface 51b of the heater bar 51 by the dimension H1, and the heater. An outlet side lower end surface end portion 51f set at a position separated by a dimension H2 larger than the dimension H1 from the upper end surface 51b of the bar 51 to the inlet side lower end surface end portion 51e, and the outlet 51 is formed in parallel with the upper end surface 51b. A first lower end surface 51c extending from the side lower end surface end portion 51f to the inlet side lower end surface end portion 51e side, and an inclined second lower side connecting the one end portion of the lower end surface 51c and the inlet side lower end surface end portion 51e. It is formed by the end face 51d.

Here, the second lower end surface 51d is formed between the length L1 with respect to the entire length L of the heater bar 51, and the first lower end surface 51c is between the length L2 with respect to the entire length L of the heater bar 51. Is formed.
In FIG. 4B, the sealing heating surface 51a of one heater bar 51 has been described. However, the sealing heating surface 52a of the other heater bar 52 is symmetrical with the sealing heating surface 51a. Yes.

  In the packaging machine heater bar device 50 of the second embodiment described above, the same operation and effect as the packaging machine heater bar device 20 of the first embodiment can be obtained, and the first lower end surface 51c has a length. Since it is provided between the dimensions L2 and becomes a rectangular heating surface portion for sealing, a large heat radiation area can be obtained, thereby more reliably sealing both side edges Fe and Fe of the web-like packaging film Fw. The merit that it can be performed is obtained.

According to the heater bar device 50 for a packaging machine of the second embodiment configured as described above, the following effects can be obtained in addition to the effects substantially the same as the above (1) to (3).
(4) Since the first lower end surface 51c is provided between the length L1 and becomes a rectangular heating surface portion for sealing between them, the heat radiation area can be increased, and thereby the web-shaped packaging film Fw The both side edge portions Fe and Fe can be more reliably sealed.

Next, a third embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 5 (A), the heater bar device 60 for a packaging machine according to the third embodiment forms sealing heating surfaces 61a and 62a on the main body portions 61A and 62A of the pair of heater bars 61 and 62, respectively. In addition, the pair of heater bars 61 and 62 are arranged so that a predetermined gap c is formed between the sealing heating surfaces 61a and 62a.
And in 3rd Embodiment, it is the space part S1 of cross-sectional C shape with respect to the square-shaped space part S of 1st, 2 embodiment.

As described above, the sealing heating surfaces 61a and 62a of the third embodiment are formed on the inner surface upper portions of the main body portions 61A and 62A of the heater bars 61 and 62, and the sealing heating surfaces 61a and 62a are It has the same shape as the heating surfaces for sealing 21a and 22a formed on the protruding portions 21B and 22B of the pair of heater bars 21 and 22 of the first embodiment.
That is, the wedge shape of the heating surface 61a for sealing is such that the upper end surfaces 61b and 62b of the heater bars 61 and 62 and the lower end surface on the inlet side set at a position away from the upper end surface 61b of the heater bar 61 by the dimension H1. 61d, outlet-side lower end surface end 61e set at a position separated by a dimension H2 larger than the dimension from the upper end surface 61b of the heater bar 21 to the inlet-side lower end surface end 61d, and the inlet-side lower end surface end 61d And an inclined lower end surface 61c connecting the outlet side lower end surface end portion 61e.

On the other hand, as shown in FIG. 5 (A), in the lower region continuous with the lower ends of the sealing heating surfaces 61a and 62a of the pair of heater bars 61 and 62, the lower ends of the sealing heating surfaces 61a and 62a are arranged. A continuous space S1 is formed. The space S1 is continuous with the lower ends of the sealing heating surfaces 61a and 62a of the heater bars 61 and 62, and is inclined in opposite directions at a predetermined angle α °. The inclined heat radiating surface portions 61f and 62f are formed.
Therefore, as shown in FIG. 5 (A), the pair of heater bars 61 and 62 has a substantially C-shaped heat radiating surface portion 61b and 62b when viewed from a direction orthogonal to the moving direction (direction orthogonal to the drawing). Yes.

According to the heater bar device 60 for a packaging machine of the third embodiment configured as described above, the following effects can be obtained in addition to the effects substantially the same as the above (1) to (3).
(4) In a lower region continuous to the lower ends of the sealing heating surfaces 61a and 62a, a space S1 having a substantially C-shaped cross section is formed by the inclined heat radiating surface portions 61f and 62f inclined at a predetermined angle α °. Yes. Since the space portion S1 warms the lower end portions of the side edge portions Fe and Fe even by radiant heat from the heat radiating surface portions 61b and 62b, the sealing process can be performed more effectively.

  Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention. Further, the present invention includes a combination of some or all of the configurations of the above-described embodiments as appropriate.

  For example, the inlet side lower end surface ends of the sealing heating surfaces 21a and 22a of the first embodiment, the sealing heating surfaces 51a and 52a of the second embodiment, and the sealing heating surfaces 61a and 62a of the third embodiment. The portions 21d, 41d, 51d are set at positions separated by the dimension H1 from the upper end surfaces 21b, 22b, etc. of the heater bars 21, 22, and extend from the position to the outlet side lower end surface end portion 21e, etc. with a linear inclination. However, it is not limited to this. Instead of the linear inclination, a curved lower end surface that swells outwardly connecting the position of the inlet side lower end surface end portion 21d and the like to the outlet side lower end surface end portion 21e or the like may be used. Even in this case, substantially the same effect as the above (1) can be obtained.

  Moreover, in the case of the said deformation | transformation form, let the position of 21 d of inlet side lower end surface edge parts be the same height as the upper end surface 21b etc. of heater bar 21, etc., and connect the outlet side lower end surface end part 21e etc. from the position. It may be a curved lower end surface bulging outward. Even in this case, substantially the same effect as the above (1) can be obtained.

  Further, the second embodiment and the third embodiment may be combined. That is, the area below the sealing heating surfaces 51a and 52a in the pair of heater bars 51 and 52 of the second embodiment may be the space S1 having a cross-sectional shape of the third embodiment. And when it does in this way, the effect substantially the same as said (3) can be acquired.

  INDUSTRIAL APPLICABILITY The present invention can be used when a side edge portion on which a cylindrical packaging film is overlapped is sealed in a horizontal bag-making filling and packaging machine with no bubbles between the side edge portions.

DESCRIPTION OF SYMBOLS 1 Horizontal type bag making filling packaging machine 2 Film supply source 3 Paper feed roller 5 Bag making machine 6 Center seal mechanism 7 End sealer 10 Paper drawing roller part 20 Heater bar apparatus for packaging machines (first embodiment)
21 and 22 A pair of heater bars 21a and 22a Heating surface for sealing 21b Upper end surface 21c Lower end surface 21d Inlet side lower end surface end portion 21e Outlet side lower end surface end portion 30 Pressure roller portion 40 Weight roller portion 50 Heater bar device for packaging machine ( Second embodiment)
51, 52 A pair of heater bars 51a, 52a Sealing heating surface 51b Upper end surface 51c First lower end surface 51d Second lower end surface 51e Inlet side lower end surface end 51f Outlet side lower end surface end 60 Heater bar device for packaging machine (first 3 embodiment)
61, 62 A pair of heater bars 61a, 62a Heating surface for sealing 61b Upper end surface 61c Lower end surface 61d Inlet side lower end surface end portion 61e Outlet side lower end surface end portions 61f, 62f Inclined heat radiating surface portion H1 Inlet side height dimension H2 Outlet side height Dimensions Fw Web-like packaging film Fe, fe Edges on both sides Ft Cylindrical packaging film BP Pillow packaging P Product (contained)

Claims (5)

The packaging film sent from the upstream side is formed into a cylindrical shape, the objects to be stored are fed into the cylindrical packaging film at a predetermined interval, and both side edges where the cylindrical packaging film is overlapped are center-sealed. A heater bar device for a packaging machine for bag making by a rear end seal device,
A pair of heater bars for allowing passage of both side edges of the cylindrical packaging film and heating to seal the both side edges;
The shape of the heating surface for sealing that heats both side edges,
A heater bar device for a packaging machine, wherein the cylindrical packaging film has a wedge shape in which a moving direction outlet side is wider than a moving direction inlet side. The heater bar device for a packaging machine according to claim 1,
The wedge shape,
The upper end surface of each heater bar, the inlet-side lower end surface end portion set at a position away from the upper end surface of each heater bar, and the lower end surface end portion on the inlet side from the upper end surface of each heater bar It was made into the shape which consists of the lower end surface end part set to the position apart by the dimension larger than the dimension and the lower end surface which connects the lower end surface end part of the said entrance side, and the lower end surface end part of the exit side A heater bar device for a packaging machine. The heater bar device for a packaging machine according to claim 1,
The wedge shape,
The upper end surface of each heater bar, the inlet-side lower end surface end portion set at a position away from the upper end surface of each heater bar, and the lower end surface end portion on the inlet side from the upper end surface of each heater bar The outlet side lower end surface end portion set at a position separated by a dimension larger than the above dimensions, and is formed in parallel to the upper end surface and extends from the outlet side lower end surface end portion to the inlet side lower end surface end side. A heater bar device for a packaging machine, comprising: a horizontal lower end surface; and an inclined lower end surface portion connecting one end portion of the horizontal lower end surface and the end portion on the inlet side. In the heater bar device for a packaging machine according to any one of claims 1 to 3,
A heater bar device for a packaging machine, wherein a space portion is provided in a lower region continuous with the heating surface for sealing of each heater bar, and the space portion is formed in a square shape. The heater bar device for a packaging machine according to claim 1,
The wedge shape,
The upper end surface of each heater bar, the inlet-side lower end surface end portion set at a position away from the upper end surface of each heater bar, and the lower end surface end portion on the inlet side from the upper end surface of each heater bar The outlet side lower end surface end set at a position separated by a dimension larger than the above dimensions, and a shape composed of a lower end surface connecting the inlet side lower end surface end and the outlet side lower end surface end,
A heater bar device for a packaging machine, wherein a space portion is provided in a lower region continuous with the heating surface for sealing of each heater bar, and the space portion is formed in a C shape.

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