JP2007039050A - End sealing apparatus and four side sealing packaging machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent creases generated during end sealing from occurring by a simple constitution. <P>SOLUTION: An end sealing apparatus performs sealing on an upper side film 11 and a lower side film 12 superposed on each other in a direction intersecting the advancing direction. In addition, the apparatus has a pair of end sealers 31 for pinching both films by a specified pressure, and at least a part of a sealer face 31a coming into contact with the films at the tip of the end sealer is made a wave shape advancing in the direction intersecting the advancing direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an end seal device and a four-side seal packaging machine.

  In an automatic packaging machine, a bag making apparatus, or the like, an end seal device is disposed on the carry-out side, and the packaging film formed in a predetermined shape is sealed in a direction crossing the traveling direction. The end seal device includes a pair of end sealers arranged so as to sandwich the packaging film. A heater is built in the end sealer, and the sealer surface at the tip is heated to a predetermined temperature. In this state, the pair of end sealers sandwich the packaging film at a predetermined pressure, so that the film portion of the packaging film in contact with the sealer surface is heated and pressed to be thermally fused. Further, there is a type in which a cutter is built in the end sealer, sealed and cut to produce individual packaging bodies (empty bag bodies). Of course, there is also a type in which only the sealing is performed and the sealed film portion is cut by a cutter device installed thereafter.

  This end seal device can be broadly divided into a rotary type in which an end sealer is attached to a rotating shaft and a top sealer rotates around the rotating shaft (at a position where the end sealer rotates 180 degrees from a position where the packaging film is sealed, There are two types, one that keeps the sealer surfaces facing each other. The latter non-rotating type is a so-called box motion type that moves back and forth in synchronism with the movement of the packaging film, or a type that simply moves up and down relative to each other (the packaging film moves intermittently and is sealed during pause) ).

  As described above, there are various types of end seal devices, but the sealer surface of the rotary end sealer is arcuate, and the sealer surface of the end sealer in the case of the non-rotating type is a flat surface (corner portion). Basically, the sealer surface of any type of end sealer is sandwiched in the axial direction (the direction across the direction of travel of the packaging film) at once, and heat-sealed against the packaging film Processing is performed.

  On the other hand, there are a wide variety of packaging materials constituting the packaging film. For example, when the article to be packaged is an article requiring airtightness such as a poultice, an aluminum laminate film is often used. As is well known, an aluminum laminate film is composed of a multilayer film including an aluminum sheet. Therefore, the aluminum laminate film has a feature that the airtightness is good but the stretchability is not so much.

  In addition, when the article to be packaged is a flat article such as a poultice, four-side seal packaging is often applied. In this four-sided seal packaging, two packaging films are overlapped from above and below, and an object to be packaged is sandwiched therebetween. In this state, individual package bodies are manufactured by heat-sealing and cutting the surrounding portions of the objects to be packaged in the two overlapped packaging films.

  By the way, when the four-side seal packaging is performed using an aluminum laminate film, wrinkles 3 may be formed in the seal portion 2 provided on the peripheral edge of the flat rectangular packaging body 1 as shown in FIG. is there. In view of the packaging process, the seal portion 2 seals the side seal portion 2a formed by sealing along the traveling direction of the packaging film and the end seal device in the direction orthogonal to the traveling direction of the packaging film. And an end seal portion 2b formed. The wrinkle 3 is mainly formed in the end seal portion 2b because the packaging process performs the side seal since the side seal is performed.

  That is, a packaging film is formed in a cylinder shape by giving a side seal. Then, since an object to be packaged (such as a poultice) is contained inside, the central portion of the cylindrical film is swollen by the thickness (height) of the object to be packaged. When the end seal treatment is performed in this state, the film portion opened in an annular shape (endless shape) is crushed by a pair of end sealers and closely adhered. At this time, when a normal packaging material having good stretchability is used, the film parts that are crushed and closely adhered are heated and pressed on the sealer surface of the pair of top sealers, so that they melt and soften. By extending appropriately, it is formed flat (a jagged pattern corresponding to the seal eye may be attached). However, in the case of an aluminum laminate film with low stretchability, it does not extend as appropriate, and thus wrinkles are generated as it is crushed.

  In order to solve such a problem, a part of the mechanism used in the gusset packaging machine, that is, when end sealing, can be dealt with by providing a mechanism for gripping both sides of the packaging film and pulling outward. That is, before sandwiching the packaging film between the pair of end sealers, the both sides of the packaging film are gripped and pulled outwards to flatten the film portion to be end-sealed to a substantially surface contact state. The occurrence of wrinkles can be suppressed by sandwiching the packaging film from above and below.

As is well known, in the case of a gusset packaging machine, in addition to the above-described mechanism for pulling outward, a gusset claw that pushes the side of the packaging film into the inner package is provided, but it is intended not to form wrinkles. In such a case, the gusset nail is not necessary. And as a wrinkle extending mechanism of the end seal device aiming at such wrinkle extending, there is one disclosed in Patent Document 1, for example.
JP-A-2005-29182

  According to the invention disclosed in the above-mentioned Patent Document 1, regardless of the type of packaging material, it is possible to manufacture a package without forming wrinkles even in the case of an aluminum laminate film, which is excellent in that respect. Is. However, a mechanism for pulling the film to the outside is necessary, and the apparatus is complicated and overall size is increased.

  Furthermore, in a packaging machine that manufactures a plurality of packages at the same time, a plurality of rows of packages are transported horizontally, and the plurality of rows of packages are separated from each other. Sealed along the direction of film travel. Therefore, even if it is pulled by the above-described pulling device, wrinkles cannot be removed sufficiently.

  Furthermore, depending on the form of the packaging machine, after sealing along the advancing direction of the film described above, there is also an end sealing process after the sealed portion is cut and separated into a plurality of rows. The above-described pulling device cannot be applied.

  The present invention has been made in view of the above-described background. The object of the present invention is to prevent wrinkles that occur during end sealing with a simple configuration, thereby causing poor appearance and poor seals due to wrinkles. An object of the present invention is to provide an end seal device and a four-side seal wrapping machine that can eliminate loss and are not limited by the number of applicable rows (both one row and a plurality of rows can be supported).

  In order to achieve the above-described object, an end seal device according to the present invention is an end seal device that seals a stacked film in a direction crossing a traveling direction, and the stacked film is sealed at a predetermined pressure. A pair of end sealers are sandwiched, and at least a part of the sealer surface that contacts the film at the end of the end sealer has a corrugated shape that advances in a direction crossing the traveling direction.

  And the said end seal apparatus is installed in a packaging machine, and it is good to comprise so that the said waveform-shaped top part may arrange two or more with respect to the end seal width of the package for one. The film may be an aluminum laminate film. Of course, other materials may be used.

  On the other hand, the four-side seal wrapping machine according to the present invention includes a transport unit that transports an object to be packaged between the upper film and the lower film, and the upper film and the lower film that are transported by the transport unit. A side seal device that side-seals a predetermined position along the transport direction, an end seal device that end-seals the upper film and the lower film in a direction crossing the transport direction, and an end-sealed portion thereof A four-side seal wrapping machine provided with a cutter means for cutting, wherein the end seal device is constituted by any one of the end seal devices described above. And the said to-be-packaged goods shall be conveyed in the state of several rows, and shall manufacture a plurality simultaneously. Of course, one row can also be applied.

  The film portions of the superposed films (upper film, lower film) sandwiched between the sealers of the pair of end sealers move in the lateral direction so as to be pulled along the surface shape (waveform) of the sealer. More specifically, the film will be pulled between adjacent vertices (mountains and valleys) of the corrugation, and regardless of the film material, both films will be tightly stretched between the vertices, causing wrinkles. do not do.

  According to the present invention, wrinkles that occur during end sealing can be prevented with a simple configuration in which the shape of the shape of the sealer surface of the end sealer is used. Thereby, the loss by the sealing defect resulting from an external appearance defect and a wrinkle can be eliminated.

  2 to 5 show a part of a four-side seal packaging machine according to an embodiment of the present invention. 2 and 3 show a state in which the end seal device is located at a reference position of 0 degree (also a standby position), and FIGS. 4 and 5 rotate 180 degrees from the reference position to seal the packaging film. The state located in the sealing position to be shown is shown.

  The four-sided seal packaging machine 10 is configured such that strip-shaped packaging films (upper and lower films 11 and 12) continuously drawn from two raw rolls (not shown) overlap vertically at a predetermined position. Is done. 2 and 3 show a state in which two wrapping films (upper film 11 and lower film 12) are already overlapped and an object to be packaged is sandwiched inside. Actually, although not shown in the drawing, the lower film 12 is conveyed in a substantially horizontal state on the upstream side of the drawing, and the packaged material is supplied to a predetermined position of the lower film 12 in the middle of the conveyance. In this Embodiment, it arrange | positions so that three to-be-packaged objects may be located in a line. That is, the four-side seal packaging machine 10 has a plurality of rows (three rows). Then, the upper film 11 is supplied so as to overlap the lower film 12 at a predetermined position after the object to be packaged is supplied, so that the object to be packaged is sandwiched between the upper and lower films 11 and 12. Configured. The configuration is the same as that of various types known in the art, and a detailed description thereof will be omitted.

  The process after the article to be packaged is sandwiched between the upper and lower films 11 and 12 as described above is performed by the apparatus shown in FIGS. That is, first, the four-side seal packaging machine includes a side seal device 15, a feed roller 16, a side cutter device 17, a vertical restraining belt 18, an end seal device 19, an end cutter device 20, and a carry-out conveyor device 21 in order from the upstream side. Yes.

  In this embodiment, the side seal device 15 includes a pair of upper and lower rectangular sealers 15a, and the upper and lower films 11 and 12 are sandwiched between the upper and lower sides with a predetermined pressure by the sealer 15a. Pressure is applied, and the contact portions of the upper film 11 and the lower film 12 are heat-sealed. Four sealers 15a are arranged in parallel to the film transport direction. Therefore, when the upper film 11 and the lower film 12 pass between the upper and lower sealers 15a, the corresponding portions are heat-sealed, and the side seal portion 23 is formed. Then, an article to be packaged is enclosed between the left and right side seal portions 23. In other words, in the present embodiment, since the objects to be packaged are arranged between the upper film 11 and the lower film 12 in a three-row state, the film part between the left and right objects to be packaged (part where there is no object to be packaged) ) Is provided with a side seal portion 23.

  The feed roller 16 is composed of a pair of upper and lower rollers, and conveys the upper film 11 and the lower film 12 by rotating in a state where the side seal portion 23 is gripped from above and below. By gripping the portion of the side seal portion 23 in which the upper film 11 and the lower film 12 are integrated by heat-sealing with a pair of rollers, the upper film 11 and the lower film 12 are smoothly and reliably rotated. To be conveyed. In addition, in the present embodiment, the feed rollers 16 are provided in the side seal portions 23, so that even the wide upper film 11 and the lower film 12 can be conveyed straight without causing distortion.

  The side cutter device 17 cuts the side seal portion 23, and includes a disc-shaped cutting blade 17a having a sharp tip and a disc-shaped receiving blade 17b having a flat peripheral surface. Four side cutter devices 17 are also arranged in a horizontal row. The center two side cutter devices 17 cut the center of the corresponding side seal portion 23. The side cutter devices 17 on both sides are for cutting the end edges of the side seal portions 23 formed on the both side edges of the upper film 11 and the lower film 12 to make the seal width uniform. And by passing this side cutter apparatus 17, the upper film 11 and the lower film 12 will be isolate | separated into 3 rows.

  The upper and lower restraint belts 18 are separated from each other in three rows by the side cutter device 17, and the upper film 11 and the lower film 12 that are side-sealed and integrated are sandwiched from the upper and lower sides, without causing lateral displacement and the like. It is conveyed and supplied to the end seal device 19 in the next stage.

  The end seal device 19, which will be described in detail later, forms an end seal portion 25 by sealing the upper film 11 and the lower film 12 conveyed in a state of being separated into three rows in the lateral direction of travel. It is. Thereby, the peripheral edge of the upper film 11 and the lower film 12 is sealed by the side seal part 24 and the end seal part 25, and the package is sealed.

  The end cutter device 20 is manufactured by cutting the end seal portion 25 so as to be separated into the front and the back and manufacturing the package 27 here. End cutter device 20 attaches cutter blade 20b to a pair of upper and lower rotating shafts 20a, and upper and lower cutter blades 20b come into contact with each other when rotating shaft 20a makes one rotation, and upper film 11 and lower film 12 in contact with each other. The end seal portion 25 is cut.

  Next, the end seal device 19 will be described. The end seal device 19 of this embodiment includes a pair of upper and lower rotating arms 30 and an end sealer 31 that revolves as the rotating arms 30 rotate. As shown in FIG. 6, the rotary arm 30 has a shape including a guide groove 30 a in which a part of a disk is cut out in a concave shape. An H-shaped bearing 33 shown in FIG. 7 is inserted into the guide groove 30a so as to be movable in the radial direction. That is, the H-shaped bearing 33 is mounted so as to be movable in the radial direction of the rotary arm 30. A substrate 36 to which the cam floor 35 is attached is attached to the outside of the H-shaped bearing 33 so as to be rotatable (spinned), and an end sealer 31 is attached to the inside of the H-shaped bearing 33 so as to be rotatable (spinned). The end sealer 31 and the substrate 36 are integrated by a coupling mechanism (not shown), and rotate integrally with the H-type bearing 33. Further, as shown in FIG. 8, the two cam floors 35 coincide with the groove cam 37 having a predetermined locus, and move along the locus of the groove cam 37. As is apparent from the drawing, the groove cam 37 is in a horizontal state in the section A that is approaching each other, and is substantially arcuate in the other sections B.

  Accordingly, as shown in FIG. 8, in the horizontal section, the substrate 36 to which the upper and lower cam floors 35 are attached, and thus the pair of upper and lower end sealers 31 sandwich the upper film 11 and the lower film 12 from above and below. To move forward. Therefore, the time for sandwiching the upper film 11 and the lower film 12 at a predetermined pressure and a predetermined temperature can be lengthened, and heat sealing can be surely performed. After the sealing process, the end sealer 31 moves away from the upper film 11 and the lower film 12 and moves along the arc-shaped section B.

  While moving in the horizontal section A, the H-type bearing 3 moves to the center side of the rotary arm 30 (see FIG. 4 and the like), and during moving in the arc-shaped section, the H-type bearing 3 moves to the rotary arm. It moves to the outer periphery side of 30 (refer FIG. 2 etc.).

  Here, in the present invention, as shown in FIG. 9, the shape of the sealer surface 31 a of the end sealer 31 is a flat surface conventionally, but proceeds in the axial direction, that is, the direction orthogonal to the film transport direction. The wave shape was changed to a wave. Of course, the sealer surface 31a of the pair of upper and lower end sealers 31 has a valley shape with the other sealer surface 31a opposite to the mountain shape. And in this Embodiment, it formed so that the vertex (4 pieces in this example) of a several wave may be located per row | line (one package) (refer FIG.9 (b)).

  As a result, the surface area of the sealer surface 31a of the end sealer 31 is larger than that of a simple flat surface and is continuous with a corrugated curved surface, so that it is sandwiched between the sealer surfaces 31a of the pair of end sealers 31. The film portions of the upper film 11 and the lower film 12 move in the lateral direction so as to be pulled along the surface (waveform) of the sealer surface 31a. More specifically, the film will be pulled between adjacent vertices (peaks and valleys) of the corrugated shape, and in accordance with the same principle as a conventional pulling device, even an aluminum laminate film with low stretchability will be pulled. By doing so, it becomes a tight state between the vertices, and wrinkles do not occur. Moreover, unlike the conventional apparatus, it is different from gripping only the both side edges of the upper film 11 and the lower film 12 and pulling them outward, and each of the short sections in the film portion to be end-sealed is pulled in the lateral direction. Therefore, wrinkles can be reliably suppressed as much as possible in the end seal portion 25 and its surroundings even in a plurality of rows as in the present embodiment (see FIG. 10).

  It should be noted that the end seal device to which the present invention is applied is not limited to the one shown in the above-described embodiment, but may be applied to a so-called box motion type or various other end seal devices. Can do.

  Further, the number of wave vertices formed per row is not limited to that described above, and may be appropriately changed depending on the film width, the type of packaging material, and the like. Furthermore, in this embodiment, the present invention is applied to a three-row four-way seal wrapping machine, but it goes without saying that it may be two rows or more than four rows, but application to one row is not hindered. Even a single row is preferable because it does not require a conventional large pulling mechanism. In addition, the wrinkles at the central portion can be surely taken regardless of the length of the film.

  Furthermore, the shape of the sealer surface is an overall continuous wave shape in the above-described embodiment (the portions corresponding to the side seal portions at both ends are flat), but the present invention is not limited to this. However, a flat portion may be provided in the middle of the waveform. For example, when a wrinkle-prone part is known in advance, the part may be corrugated and the other part may be flat.

It is a figure which shows the package of a prior art example. It is a front view which shows suitable one Embodiment of the four-side seal packaging machine of this invention. It is a top view which shows suitable one Embodiment of the four-side seal packaging machine of this invention. It is a front view which shows suitable one Embodiment of the four-side seal packaging machine of this invention. It is a top view which shows suitable one Embodiment of the four-side seal packaging machine of this invention. It is a perspective view which shows the rotating arm which is one of the components of an end seal apparatus. It is a perspective view which shows the cam floor, board | substrate, H type bearing, and end sealer which are some components of an end seal apparatus. It is a figure which shows the cam groove which is a part of component of an end seal apparatus, a cam floor, and an end sealer. (A) is a general view showing an end sealer, and (b) is an enlarged view of a sealer surface portion. It is a figure which shows the package body manufactured by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Four-side seal packaging machine 11 Upper film 12 Lower film 15 Side seal device 16 Feed roller 17 Side cutter device 18 Vertical restraint belt 19 End seal device 20 End cutter device 21 Unloading conveyor device 23 Side seal part 25 End seal part 27 Packaging 30 Rotating arm 30a Guide groove 31 End sealer 31a Sealer surface 33 H-type bearing 35 Cam floor 36 Substrate 38 Groove cam

Claims (5)

An end-seal device that seals the stacked films in a direction crossing the traveling direction,
Having a pair of end sealers that sandwich the overlaid film at a predetermined pressure;
An end seal device characterized in that at least a part of the sealer surface contacting the film at the tip of the end sealer has a corrugated shape that advances in a direction crossing the traveling direction. The end seal device is installed in a packaging machine,
The end seal device according to claim 1, wherein a plurality of the wave-shaped top portions are arranged with respect to an end seal width of one package.   The end seal device according to claim 1, wherein the film is an aluminum laminate film. Conveying means for conveying an object to be packaged between the upper film and the lower film,
A side seal device for side-sealing a predetermined position of the upper film and the lower film conveyed by the conveying means along a conveying direction;
An end seal device for end sealing the upper film and the lower film in a direction crossing the conveying direction;
A four-side seal wrapping machine provided with a cutter means for cutting the end-sealed portion,
A four-side seal packaging machine, wherein the end seal device comprises the end seal device according to any one of claims 1 to 3.   The four-side seal packaging machine according to claim 4, wherein the objects to be packaged are conveyed in a plurality of rows and manufactured at the same time.

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