JP5343426B2 - Heat sealing equipment - Google Patents

Description

  The present invention relates to a heat seal device that is applied to a filling and packaging apparatus using a packaging film and performs lateral sealing on the packaging film, and more particularly to a pressurizing mechanism of a lateral sealing roll, and in particular, liquid packaging It is possible to effectively prevent the occurrence of sealing failure even when particulate matter that may be contained in the product is caught between the heat seal blades of a pair of horizontal seal rolls. Propose technology.

  As a conventional filling and packaging apparatus to which this type of heat sealing apparatus is applied, for example, as described in Patent Document 1, a continuously transported packaging film is folded back to a half width, and a free end portion of the folded film is used. The packaging film is formed into a cylindrical shape by this vertical sealing portion, and the cylindrically formed film is laterally sealed in the film width direction by the horizontal sealing roll. The bottom portion of the film is molded, and the film formed into a bottomed cylindrical shape is filled with an article to be packaged made of liquid or the like by a filling mechanism. After a package bag is formed by filling and packaging the package, a single package bag is cut by a cutter mechanism at the intermediate portion of the lateral seal portion of the continuously manufactured package bag Or to carry-out, or to the cutter mechanism in the stopped state, the packaging bags are unloaded in the continuous packaging successive states, such as those so as to packaging packed in the storage box is known.

  In this case, the packaging film drawn out and guided from the raw film wound in a roll shape is folded back to a half width, and the folded film is formed into a bag by the vertical seal roll and the horizontal seal roll as described above. In the vertical seal roll and the horizontal seal roll, the seal roll main bodies arranged in parallel so as to be close to each other are rotationally driven in opposite directions to each other, and are provided in the respective seal roll main bodies. The film is melted while expelling the contents such as liquid and viscous substance existing inside the film upward or downward by pressing and heating while sandwiching and passing the film between the heat seal blades. I try to seal it.

  By the way, the packaging film that is heat-sealed in this way and is used for filling and packaging the packaged object is generally extremely thin, such as several tens of microns. In order to do so, it is necessary to properly adjust the distance between the heat seal blades provided between the paired seal roll bodies and the pressure applied to the packaging film sandwiched between the heat seal blades.

Therefore, in Patent Document 2, in the case where the folded end edges of the continuously transported film are overlapped and vertically sealed, and the film is horizontally sealed in a state of being sandwiched by a pair of facing heat heat rolls facing each other, at least, A setting for setting a gap between the transverse heat seal rolls by contacting the transverse heat seal rolls with each other and providing an elastic mechanism capable of repressing the transverse heat seal rolls to the lateral heat seal roll side. parts have been described heat-sealing equipment, characterized in that which is configured by providing a describes a versa heat sealing device in Patent Document 3.
Japanese Examined Patent Publication No. 4-69872 Japanese Unexamined Patent Publication No. 4-114484 JP-A-8-301237

  However, since all of the prior arts described in Patent Documents 2 and 3 are configured by an air cylinder as a pressurizing means that presses one side seal roll toward the other side seal roll, for example, an article to be packaged In the case of foreign matter sealing with continuous filling, when the granular material in the package is caught between the heat seal blades of a pair of horizontal seal rolls, it is pressed to the other horizontal seal roll side. One of the horizontal seal rolls is displaced backward relative to the other horizontal seal roll against the pressing force of the air cylinder, and there is a possibility that a seal failure may occur at the horizontal seal portion.

  On the other hand, in the conventional technology in which one horizontal seal roll is pressed to the other horizontal seal roll side with a push screw or the like, numerical control of the applied pressure is difficult. However, there is a possibility that the film may be cut due to excessive pressing of the lateral heel roll.

  The present invention has been made to solve such problems of the prior art, and its object is to push one horizontal seal roll toward the other horizontal seal roll. Providing a heat seal device that is easy to control and control pressure, and that can effectively eliminate the possibility of defective seals even when particulates or the like are caught between the heat seal blades of a pair of horizontal seal rolls. There is.

The heat-sealing device of the present invention is arranged in a film width direction on a packaging film that is arranged in parallel with each other in a horizontal position in a horizontal plane, is rotationally driven in opposite directions, and has been subjected to vertical sealing in advance by a vertical sealing roll. A pair of horizontal seal rolls that intermittently apply a horizontal seal extending in the direction, and at least one horizontal seal roll is disposed so as to be movable back and forth with respect to the other horizontal seal roll. be comprised provided with a pressurizing means for pressing the lateral seal roll side, the pressure means, to press the bearing block of one horizontal sealing roll, and pneumatic Moshikuwa hydraulic Siri Sunda, in parallel with the cylinder A spring member that is arranged and has a spring force that is externally adjusted.

  In this case, the spring member can be disposed outside the cylinder, but it is more preferable that the spring member be incorporated in the cylinder.

Various modes of adjusting the spring force of the spring member are conceivable, but it is preferable that a screw member serving as a spring force adjusting means is disposed through the spring member.
Here, the screw member can be made to directly apply the spring force of the spring member to the piston, but the screw member is screwed to the piston of the cylinder to provide the spring of the spring member. It is preferred that the force be adjusted and supported.

  Furthermore, it is preferable that the spring member is configured by overlapping a plurality of disc springs.

In the heat seal apparatus of the present invention, in particular, the pressurizing means is arranged in parallel with the cylinder for pressing the bearing block of one horizontal seal roll toward the other horizontal seal roll, and the spring force is externally adjusted. When the cylinder is used as a main component and both of them function simultaneously, one of the lateral seal rolls can be pressed with the sum of the cylinder spring force and the spring force of the spring member. This is because, even if the granular material or the like is caught between the heat seal blades of a pair of lateral sheet Ruroru, and very small retraction displacement amount of one of the lateral seal rolls, sealing failure in the transverse seal sites In addition to greatly reducing the risk of occurrence of spillage, it is possible to efficiently extrude the granular material, etc., from the lateral seal portion under the melting of the sealant layer of the packaging film. It can become.

Further, in this pressurizing means, when adjusting the initial pressurizing force, the pressurizing force of the piston is adjusted only by the fluid pressure to make the seal state almost appropriate, and then the spring force of the spring member acts slightly. Since the applied pressure can be adjusted by adjusting the spring force of the spring member to the extent, it is possible to manage the applied pressure with the fluid pressure substantially, and simple adjustment and management of the applied pressure is easy. Can be done.
Therefore, here, it is possible to effectively prevent the occurrence of film breakage or the like due to excessive pressing of the horizontal seal roll by a push screw or the like.

  As described above, the case where the horizontal seal roll is pressed with both the cylinder and the spring member has been described. However, once the initial setting is finished, the horizontal seal roll can be pressed with only one of them, and only the spring member is used. The pressure can be selected appropriately according to requirements without the need for replacement of parts, etc., by setting the cylinder internal pressure to zero and pressing the cylinder only by disabling the spring force of the spring member. .

Here, when the spring member is incorporated in the cylinder, the apparatus can be reduced in size as compared with the case where the spring member is arranged in parallel outside the cylinder.
This is more effective when a screw member that adjusts the spring force of the spring member is disposed through the spring member.

  By the way, a screw member that adjusts and supports the spring force of the spring member is screwed into the piston of the cylinder, and the screw member is loosened from the piston, thereby allowing the spring member to be, for example, the screw member. When the cylinder member is compressed and deformed between the cylinder block and the spring force of the spring member to be transmitted to the piston via the screw member, the screw member operated from the outside is simply passed through the cylinder block. Therefore, it is much easier to assemble the device than when the spring member is compressed and deformed by the screw member screwed into the cylinder block and the spring force of the spring member is directly transmitted to the piston. There are advantages that can be made.

  In addition, when the spring member is configured by overlapping a plurality of disc springs, a large spring force can be generated under a small occupied volume.

  FIG. 1 is a front view illustrating a filling and packaging apparatus to which the apparatus according to the present invention is applied, and FIG. 2 is an enlarged cross-sectional plan view showing a pair of horizontal seal rolls together with a drive mechanism.

  In the illustrated filling and packaging apparatus, a holding frame 12 is provided on the side of the machine base 11 so that the film roll R wound in a roll shape can be exchanged, and the film roll R supported by the holding frame 12 can be replaced. The packaging film F is drawn out and guided.

  The upper part of the machine base 11 is provided with a film guide part 13 composed of a film slack prevention mechanism, and the film F that has passed through the film guide part 13 is guided to the film folding part 14. A rod-shaped guide rod 15 that supports and guides the folded portion of the film F is suspended from the film folding portion 14, and a nozzle 17 provided in the filling mechanism 16 is suspended in close proximity to the guide rod 15. Through this nozzle 17, the liquid packaging material that may contain particulates such as sauce, soy sauce, dressing, and soup can be filled into the inner surface side of the packaging film F to be made. Has been.

  Further, a vertical sealing mechanism 18, a horizontal sealing mechanism 19 and a cutter mechanism 20 are sequentially arranged from the upper side of the machine base 11 below the film folding portion 14, and the packaging film drawn out from the film roll R is provided. F is guided to the film folding part 14 through the film guiding part 13, and is folded in half along the longitudinal direction by a guide rod 15 provided in the film folding part 14, and the packaging film F is folded back. In a state where the end portions are overlapped, the free end portion is vertically sealed by a longitudinal heat seal blade 22 provided on a pair of opposed longitudinal seal rolls 21 of the longitudinal seal mechanism 18, and the packaging film is provided by the longitudinal seal. F is formed in a cylindrical shape, and the film F formed in this cylindrical shape is subjected to a transverse heat seal provided on a pair of transverse sealing rolls 23 facing the transverse sealing mechanism 19. 24, a lateral seal extending in the width direction of the film F is provided, the bottom of the packaging bag is formed by the lateral seal portion, and an object to be packaged is filled by the filling mechanism 16 in the film F formed in the bottomed cylindrical shape. Further, after the film F is fed, the horizontal seal mechanism 19 performs horizontal sealing again to form a packaging bag formed by filling and packaging an article to be packaged. The intermediate portion of the horizontal seal portion is cut into one bag by the operation of the cutter mechanism 20, and each individual packaging bag is carried out via the carry-out mechanism, or the operation of the cutter mechanism 20 is stopped to make a continuous packaging bag. Is configured to be able to be carried out via a carry-out mechanism.

  Here, the lateral seal mechanism 19 is provided with a pair of bearing bases 25 protruding from the front surface of the machine base 11 as shown in FIG. A pair of guide shafts 26 that form a pair in the vertical direction are provided on the respective bearing bases 25 so as to protrude further forward, while pivotally supporting the other horizontal seal-roll 23 that is fixed in position therebetween. A support plate 27 is fixed to the tips of these guide shafts 26, and a bearing slide base 28 is slidably fitted to each pair of guide shafts 26. Further, each bearing slide base as a bearing block is fitted. 28, one lateral seal roll 23 whose position is variable is rotatably supported, and the one horizontal seal roll 23 and the other horizontal seal roll 23 are arranged in parallel with each other in a close attitude in a horizontal plane. On the other hand A helical gear 29 that meshes with each other is fixed to the horizontal seal roll 23 and the other horizontal seal roll 23, and a driven bevel gear 30 is provided integrally with the other helical gear 29. A driving bevel gear 31 driven by a driving device (not shown) provided in the machine base 11 is engaged.

  Further, a heater is built in the horizontal seal roll 23 that forms a pair of such horizontal seal mechanisms 19, and the outer peripheral portion of each horizontal seal roll 23 is sandwiched in a direction across the tubular film F, respectively. A plurality of horizontal heat seal blades 24 that are heat-sealed are attached, and are positioned adjacent to both end portions of the horizontal heat seal blade 24 and in contact with the outer peripheral surface, and between the shafts of the pair of horizontal seal rolls 23 A position restricting flange 32 that specifies the distance is projected. Further, the support plate 27 is provided with a pressurizing means 33 for pressing a bearing slide base 28 that pivotally supports one horizontal seal roll 23 toward the other horizontal seal roll 23.

  By the way, each horizontal heat seal blade 24 is attached to the pair of horizontal seal rolls 23 so as to face each other and sandwich the packaging film F with a required force. The distance between the heat seal blades for pressurizing and heating the film F of the blade 24 is determined by the thickness of the packaging film F under the mutual contact between the outer peripheral surfaces of the position regulating flanges 32 of the pair of horizontal seal rolls 23. It is set to be slightly smaller.

  Therefore, according to the horizontal seal mechanism 19 configured as described above, the one horizontal seal roll 23 is pressed against the other horizontal seal roll 23 fixed to the bearing base 25 of the machine base 11 of the packaging machine. The distance between the lateral heat seal blades 24 opposed by the rotation of the pair of lateral seal rolls 23 by pressing by the operation of 33 and bringing the outer peripheral surfaces of the respective position regulating flanges 32 into contact with each other is, for example, The dimension is set based on the contact state of the position regulating flange 32, and the interval is set to be slightly narrower than the thickness of the film F. Therefore, the interval dimension is determined from the thickness of the film F. The deducted amount acts as a pressing force. That is, in consideration of the thickness of the base film provided on the outer side of the film F and the thickness of the molten resin layer acting on the thermal welding provided on the inner side when the film F is pressed and heated, the molten resin layer Thus, a sufficient pressure is applied, and an interval corresponding to a thickness satisfying a predetermined adhesive strength is set.

In FIG. 2, reference numeral 34 denotes, for example, each guide shaft between the bearing block of the other lateral seal roll 23 whose position is fixed and the bearing slide base 28 that bears one lateral seal roll 23 whose position is variable. 26 shows a compression spring member disposed on 26, and this compression spring member 34 always urges the bearing slide base 28 in a direction away from the bearing block.
The compression spring member 34 functions to displace and displace the pair of horizontal seal rolls 23 by, for example, disabling the pressurizing means 33, so that the film can be easily passed between the seal rolls. And can be done easily.
By the way, such a compression spring member 34 is disposed completely between the bearing block of the other side seal roll 23 and the bearing slide base 28 of one side seal roll 23, completely independent from the guide shaft 26. You can also.

  In this way, the interval between the mutually opposing horizontal heat seal blades of the pair of horizontal seal rolls 23 is set to a predetermined value, and one horizontal seal roll 23 is pressed against the other horizontal seal roll 23 side. Depending on the structure of the pressure means or the magnitude of the pressing force, the above-mentioned problem may occur. Therefore, here, it is apparent from FIG. 3 showing a cross section taken along the line III-III in FIG. As described above, the support plate 27 fixed to the tip of the guide shaft 26 is a cylinder block having a cylinder tube portion, and a pressurized fluid, for example, pressurized air, from a port (not shown) into the cylinder block 27 is shown. Alternatively, by supplying the pressurized liquid, the cylinder tube portion is slid toward the bearing slide base 28 as a bearing block, and the slide base 28 is moved to the other side slide. The pressurizing means 33 is configured by a cylinder 36 configured by providing a piston 35 that presses toward the roll 23 and a spring member 37 arranged in parallel with the cylinder 36. In this case, the spring force of the spring member 37 Can be adjusted by operating the screw member 38 from the outside of the cylinder block 27, for example.

  By the way, as shown in the drawing, the spring member 37 is preferably incorporated and arranged in the cylinder 36 in order to reduce the size of the apparatus. This means that the screw member 38 for adjusting the spring force of the spring member 37 is provided. The same applies to the case where the spring member 37 is provided so as to penetrate as shown in the figure.

As shown in the figure, a screw member 38 is screwed onto the back side of the piston 35 and is provided so as to penetrate the cylinder block 27. A spring member 37 interposed between the piston 35 and the cylinder block 27 is provided. The screw member 38, for example, a washer 38a fitted to the screw member 38 and the cylinder block 27 can be compressed so that the generated spring force is supported by the screw member 38, and the piston 35 is advanced with the spring force. When pressing in the direction, the screw member 38 can be simply passed through the cylinder block 27 with an O-ring or other sealing member 38b interposed therebetween, so that the screw member 38 is screwed into the cylinder block 27. Compared to the case where the spring force of the spring member 37 is directly applied to the piston 35, the combination of the pressurizing means 33 is arranged. An advantage of the hand easily.
Here, the spring constant of the spring member 37 has a spring constant of about 8 to 15 times that of the compression spring member 34 interposed between the bearing block of the other lateral seal roll 23 and the bearing slide base 28. It is preferable that heat sealing of the packaging film with a pair of heat seal blades is performed appropriately without damaging the film.
That is, in general, the film clamping force by the heat seal blade, which can be expressed as the difference between the spring constants of the two spring members 34 and 37, is less than the ratio of the spring constants of the both of the conventional cylinder type. As with the case of the conventional type, while there is a high risk of occurrence of poor sealing due to the biting of contaminants, when the spring constant ratio exceeds 15 times, as with the screw type of the prior art, film cutting There is a risk that scratches may occur in the heat seal blade due to the biting of foreign substances.

  More preferably, the spring member 37 is formed as a superposed structure of a plurality of disc springs 37a, so that a large spring force can be generated under a small volume.

When the pressing means 33 configured as described above presses one of the horizontal seal rolls 23 against the other horizontal seal roll 23 to bring it only by the action of the cylinder 36, the back side of the piston 35 The required fluid pressure is applied to the bearing slide table 28 and the piston 35 presses the bearing slide base 28 against the spring force of the compression spring member 34 toward the bearing block side of the other transverse seal roll 23 to thereby provide both lateral seals. For example, when the roll 23 is brought about only by the action of the spring member 37, the screw member 38 is rotated in the direction to be extracted from the piston 35. The amount of compressive deformation of the spring member 37 is increased as necessary to generate a required spring force, and the generated spring force is transferred to the piston through the screw member 38. It can be carried out by transfer to 35.
In the former case, the screw member 38 is sufficiently tightened so that the spring force of the spring member 37 is substantially zero, and in the latter case, the pressure on the back side of the piston 35 is substantially zero. . In the latter case, the amount of protrusion of the screw member 38 from the cylinder block 27 gradually increases due to the rotational displacement of the screw member 38. Therefore, the amount of protrusion of the screw member 38 is measured. Thus, the spring force of the spring member 37 can be obtained with a required accuracy.

On the other hand, in order to achieve the required pressing force by both the cylinder 36 and the spring member 37 of the pressurizing means 33, for example, the applied pressure of the piston 35 is generally set to a required value only by the fluid pressure, and then the screw member 38 is used. Can be performed by rotating the spring member 37 in a loosening direction to generate some spring force on the spring member 37.
Therefore, also in this case, the pressing force can be easily adjusted.

Thus, according to this heat sealing device, in particular, the pressurizing means 33, even if a particulate matter or the like in the package is caught between the heat seal blades 24 of the pair of horizontal seal rolls 23, By effectively constraining the displacement of the horizontal seal roll 23 from the other horizontal seal roll 23 by the action of the spring member 37, the possibility of occurrence of a seal failure is effectively reduced, and the biting is also performed. It is also possible to advantageously extrude the granular material and the like from the horizontal seal portion.
Further, by specifying the roll pressing force by the pressurizing means 33 mainly using the cylinder 36 that is easy to control numerically, it is possible to effectively prevent the occurrence of film breakage due to excessive pressing of the packaging film F. Can do.

Soshitema was, initial adjustment of the pressing force, as described above, mainly to adjust the fluid pressure supplied to the cylinder 36, by performing the generation of the spring force of the spring member 37 as a slave, very its initial adjustment It can be done easily.
Here, switching to roll pressing only by the cylinder 36 can be performed by tightening the screw member 38 that completely releases the spring member 37, while pressing only by the spring member 37 is fluid that is supplied to the cylinder 36. Since the pressure can be set to zero, the pressing of the seal roll 23 is performed by only one of the cylinder 36 and the spring member 37, or by both of them. However, work such as parts replacement can be completely eliminated.

  The concept of the heat sealing apparatus of the present invention is mainly applied to an automatic liquid filling and packaging apparatus, but is also applied to an automatic liquid filling machine containing a viscous material or a solid material.

It is a front view which illustrates the filling packaging apparatus to which this invention is applied. It is a principal part sectional top view of a horizontal seal mechanism. It is an expanded sectional view which follows the III-III line of FIG.

Explanation of symbols

11 Machine base 18 Vertical seal mechanism 19 Horizontal seal mechanism 20 Cutter mechanism 23 Horizontal seal roll 24 Horizontal heat seal blade 25 Bearing base 26 Guide shaft 27 Support plate (cylinder block)
28 Bearing slide base 32 Position restriction flange 33 Pressurizing means 34 Compression spring member 35 Piston 36 Cylinder 37 Spring member 37a Belleville spring 38 Screw member 38a Washer 38b Seal member

Claims (5)

Arranged in parallel, are rotated mutually in Gyakukata direction, advance the longitudinal seal wrapping film which has been subjected, comprising a pair of lateral seal rolls subjected to transverse seals extending in the transverse direction of the film intermittently, at least one The horizontal seal roll is disposed so as to be movable back and forth with respect to the other horizontal seal roll, and is provided with a pressurizing means for pressing one of the horizontal seal rolls toward the other horizontal seal roll. And
A heat seal device comprising: a cylinder that presses the bearing block of one of the lateral seal rolls, and a spring member that is arranged in parallel with the cylinder and has an external spring force.   The heat seal device according to claim 1, wherein a spring member is incorporated in the cylinder.   The heat seal device according to claim 1 or 2, wherein a screw member that adjusts the spring force of the spring member is disposed so as to penetrate the spring member.   The heat seal device according to any one of claims 1 to 3, wherein a screw member that adjusts and supports a spring force of the spring member is screwed into a piston of the cylinder.   The heat seal device according to any one of claims 1 to 4, wherein the spring member is constituted by a plurality of disc springs.

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