JP5524927B2 - Horizontal sealing device and filling and packaging device having the same - Google Patents

Description

  The present invention comprises a plurality of seal bars that are overlapped and run in the longitudinal direction, each having a plurality of seal bars positioned at equal intervals in the circumferential direction and annular flanges positioned on both outer sides of the seal bars. And a horizontal seal device for intermittently forming a horizontal seal portion extending in the width direction on the film in the longitudinal direction of the film by heating and pressurizing with a pair of horizontal seal rolls and welding them together. The present invention relates to a filling and packaging apparatus including the apparatus.

  2. Description of the Related Art In recent years, packaging bags made of plastic films filled with food and drink, seasonings, pharmaceuticals, cosmetics, and other packaging materials made of fluid materials such as liquid, viscous or jelly have been widely used.

  Such a packaging bag is a long packaging made of a laminated film in which a base film layer made of, for example, biaxially stretched nylon and a sealant layer made of, for example, an unstretched ethylene-vinyl alcohol copolymer resin are laminated. From a film, it can be bag-formed by the vertical filling packaging apparatus disclosed by patent document 1, for example.

  This vertical filling and packaging apparatus is configured such that a long packaging film is continuously run from top to bottom while the packaging film is first folded in the width direction so that the sealant layers face each other during the running. A vertical seal extending in the longitudinal direction, with the edges overlapped, and then the two side edges overlapped with the packaging film are sandwiched between a pair of vertical seal rolls and heated and pressurized to weld together. By forming the part, the packaging film is formed into a cylindrical shape.

  Next, the cylindrical packaging film is formed by a plurality of seal bars positioned at equal intervals in the circumferential direction around each of the pair of horizontal seal rolls of the horizontal seal device provided in the vertical filling and packaging device. By sequentially sandwiching and heating and pressurizing, they are sent to each other while being welded to each other, and a transverse seal portion extending in the width direction of the cylindrical packaging film is intermittently formed at intervals in the longitudinal direction of the packaging film. In addition to making a packaging bag, the packaged article is continuously formed in the packaging film, or from the formation of one horizontal seal portion to the next horizontal seal portion on the cylindrical packaging film. The packaging bag is filled with the packaging material by filling the packaging bag in each packaging bag intermittently and then cutting the packaging film at a substantially central portion in the film longitudinal direction of each horizontal seal portion. At high speed Dynamically and continuously number made bags.

  Here, the lateral seal device further includes a support mechanism for horizontally arranging the pair of lateral seal rolls so as to be parallel to each other and capable of approaching and separating from each other, and the lateral seal rolls at the same speed and opposite to each other. And a biasing mechanism that biases one of the horizontal seal rolls toward the other, and each of the biasing mechanisms has both end portions of the support shaft of one horizontal seal roll respectively. An air cylinder that presses the supporting bearing portion in a direction approaching the bearing portion that supports both ends of the supporting shaft of the other horizontal seal roll, and each of the pair of horizontal seal rolls has a heater inside. And a pair of annular flanges on both outer sides of both ends of the seal bar.

  As a result, the horizontal sealing device of the above-described conventional vertical filling and packaging apparatus uses the air cylinder so that the bearing portions at both ends of the support shaft of one horizontal seal roll face the bearing portions at both ends of the support shaft of the other horizontal seal roll. The pair of annular flanges of one horizontal seal roll is brought into contact with the pair of annular flanges of the other horizontal seal roll, and the seal bars face each other as the horizontal seal roll rotates. While holding the gap between the seal bars when it comes to the position, heat and press the cylindrical packaging film with those seal bars heated by the heater inside the horizontal seal roll, and overlap them in a cylindrical shape The wrapping film is welded to form a transverse seal portion intermittently on the wrapping film.

JP 04-114841 A

  By the way, in the said conventional horizontal sealing apparatus, since one horizontal seal roll is pressed toward the other horizontal seal roll with the constant pressing force of the air cylinder, if the pressing force of the air cylinder is weak, the horizontal seal roll As the seal bar comes to a position facing each other with the rotation of the packaging film and the packaging film is sandwiched between them and laterally sealed, the packaging film pushes the seal bar back against the pressing force of the air cylinder, No pressure is applied to the film, and the lateral seal portion cannot be reliably formed.

  For this reason, in the above-described conventional horizontal sealing device, the pressing force of the air cylinder is always set to be strong so as to reliably form the horizontal sealing portion, and the packaging film is heated and pressurized while maintaining the distance between the seal bars as much as possible. Therefore, during heating and pressurization of the packaging film by the seal bar of the horizontal seal roll, a base film layer made of nylon or a sealant layer made of ethylene-vinyl alcohol copolymer resin or the like is removed from the seal bar. There was an inconvenience of being easily damaged by excessive pressure.

  Therefore, an object of the present invention is to eliminate the inconvenience described above by providing a lateral seal device capable of appropriately maintaining the pressure applied to the film. Another object of the present invention is to eliminate the above-mentioned disadvantages by providing a filling and packaging apparatus including a lateral sealing apparatus that can appropriately maintain the pressure applied to the film.

  SUMMARY OF THE INVENTION The present invention advantageously solves the above-mentioned problems, and the lateral seal device of the present invention is a plurality of long films that are overlapped and run in the longitudinal direction, each of which is positioned at equal intervals around the circumference. Horizontal seals that extend in the width direction of the film by being heated and pressurized by a pair of horizontal seal rolls and welded to each other. In the transverse sealing device in which the portions are intermittently formed in the longitudinal direction of the film, the transverse sealing rolls having the bearings that respectively support both ends of the supporting shafts of the paired transverse sealing rolls, A support mechanism that supports the pair of side seal rollers in parallel with each other so as to be able to approach and separate from each other, a drive mechanism that rotates the pair of lateral seal rolls in the opposite directions at a constant speed, and a pair of lateral mechanisms An urging mechanism for urging the roll rolls toward each other, and the urging mechanism includes a bearing portion of the support mechanism in a direction in which the lateral seal rolls approach each other, A low pressing force cylinder that presses to a contact position and a bearing portion of the support mechanism are pressed to a position that is a predetermined distance behind the position where the annular flanges contact each other in a direction in which the lateral seal rolls approach each other. And a high pressing force cylinder.

  In addition, the filling and packaging apparatus of the present invention is a longitudinal seal roll in which the side edges of the packaging film are moved in the longitudinal direction while one packaging film folded in the width direction or two packaging films stacked on each other are run in the longitudinal direction. The packaging film is formed into a cylindrical shape by continuously forming the vertical seal portion by applying pressure while heating, and the cylindrical packaging film is heated while being heated in the width direction by the horizontal sealing roll of the horizontal sealing device. Forming a packaging bag by intermittently forming a lateral sealing portion over the entire width of the cylindrical packaging film at intervals in the longitudinal direction, and forming one lateral sealing portion for the cylindrical packaging film In the filling and packaging apparatus for filling the packaging bag into each packaging bag by supplying the packaging material into the packaging film during the period from the formation of the next horizontal seal to the next or continuously. Shi It is characterized in that it comprises a transverse sealing apparatus of the present invention as Le device.

  In the lateral seal device of the present invention and the filling and packaging device including the same, the support mechanisms are respectively provided on the outer sides of the plurality of seal bars located at equal intervals in the circumferential direction and at both ends of the seal bars. A pair of lateral seal rolls each having an annular flange that is positioned are supported in parallel with each other by bearings that respectively support both ends of the support shafts of the lateral seal rolls so as to be close to and away from each other. The drive mechanism rotates the pair of horizontal seal rolls in the opposite directions at the same speed, and the biasing mechanism biases the pair of horizontal seal rolls toward each other in the approaching direction. Until the seal bars of the horizontal seal rolls come to a position facing each other as the horizontal seal rolls rotate, the annular flange of one horizontal seal roll and the other horizontal seal The abutment with the annular flange of the roll ensures a sufficient space between the seal bars so that they do not touch the film. The film is heated and pressed by sandwiching the films with the seal bars, and the overlapped films are welded to each other, and the transverse seal portion extending in the width direction is formed on the film in the longitudinal direction of the film. Form intermittently.

  At the time of this horizontal seal, the low pressing force cylinder of the urging mechanism has a bearing portion that supports both ends of the support shaft of at least one horizontal seal roll of the pair of horizontal seal rolls. In the direction in which they are close to each other, press until the annular flanges of the paired horizontal seal rolls abut against each other, whereby the paired horizontal seal rolls have the seal bars of the horizontal seal rolls between them. In order to avoid contact with the passing film, the gap between the seal bars is sufficiently secured by contact between the annular flanges, and in this state, they come to positions facing each other with the rotation of the paired horizontal seal rolls. The seal bar sandwiches the film between them, so that at least one of the horizontal seal rolls is separated from the other horizontal seal roll in order to reduce the pressing force. Until the bearing portion of the lateral seal roll moves by a predetermined distance corresponding to the set thickness of the lateral seal portion of the film, for example, from the position where the annular flanges abut against each other. The horizontal seal roll is continuously pressed toward the other horizontal seal roll by the lower pressing force of the low pressing force cylinder than the high pressing force cylinder, and the seal bars facing each other of the horizontal sealing rolls are low. A horizontal seal portion is formed so that the film is heated and pressed with a constant applied pressure so that the film is not damaged by excessive applied pressure.

  During the formation of the horizontal seal portion, the seal of at least one horizontal seal roll is moved so that the bearing portion of the at least one horizontal seal roll moves beyond the predetermined distance from the position where the annular flanges abut each other. When the bar is pushed back further by the film, the high pressing force cylinder presses the lateral seal roll with a constant pressing force that is higher than the pressing force of the low pressing force cylinder, and the bearing portion is connected between the annular flanges. The horizontal seal roll is pushed out from the abutting position to a position moved by a predetermined distance corresponding to the set thickness of the horizontal seal portion, and the horizontal seal portion is reliably formed on the film.

  Therefore, according to the lateral sealing device and the filling and packaging device having the same according to the present invention, the cylinder for high pressing force with respect to the movement of the bearing portion beyond the predetermined distance from the position where the annular flanges abut each other. Since the horizontal seal roll is pressed with a high pressing force, the horizontal seal can be reliably formed on the film, and the movement of the bearing portion from the position where the annular flanges abut against each other to a predetermined distance is low. Since the horizontal seal roll can be formed on the film by pressing the horizontal seal roll with the low pressing force of the pressing force cylinder and the horizontal seal roll has a low and constant pressure, damage to the horizontal seal due to excessive pressure Can also be avoided sufficiently.

  In the lateral sealing device of the present invention, the high pressure cylinder and the low pressure cylinder are arranged on the same axis, and the piston rod of the high pressure cylinder is the same as that of the low pressure cylinder. It is preferable that the piston rod is slidably penetrated. In this way, by setting the advancing limit position of the high pressing force cylinder behind the advancing limit position of the low pressing force cylinder, a two-stage pressing force urging mechanism can be easily configured. In addition, when the high pressing force cylinder applies a pressing force to the bearing portion, the low pressing force cylinder can simultaneously apply the pressing force to the bearing portion, so that the high pressing force cylinder can be made compact. .

  In the lateral seal device of the present invention, it is preferable that the high pressing force cylinder has a larger pressure receiving area than the low pressing force cylinder. In this way, it is possible to easily realize the high pressing force of the high pressing force cylinder and the low pressing force of the low pressing force cylinder with the same or different working fluids. The working fluid for the high pressing force cylinder and the low pressing force cylinder in the present invention is preferably pressurized air, but at least one of them may be a pressurized working fluid such as hydraulic fluid.

It is a schematic diagram which shows the structure of the vertical filling packaging apparatus as one Example of the filling packaging apparatus of this invention provided with the horizontal sealing part formation part as one Example of the horizontal sealing apparatus of this invention. (A) And (b) is the top view and front view which show the structure of the horizontal seal | sticker part formation part of the said Example. (A) And (b) is the front view and sectional drawing which expand and show the said horizontal seal | sticker part formation part. (A)-(c) is explanatory drawing which shows the first half of the operation state of the horizontal seal | sticker part formation part of the said Example. (A), (b) is explanatory drawing which shows the second half of the operation state of the horizontal seal | sticker part formation part of the said Example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing a configuration of a vertical filling and packaging apparatus as an embodiment of the filling and packaging apparatus according to the present invention, which includes a horizontal seal portion forming portion as an embodiment of the transverse sealing apparatus of the present invention. FIG.

  The vertical filling and packaging apparatus of this example includes a base film layer made of, for example, biaxially stretched ethylene-vinyl alcohol copolymer resin, and a sealant layer made of, for example, unstretched ethylene-vinyl acetate copolymer resin. While continuously running in the longitudinal direction of one long packaging film made of laminated film laminated with each other, it is folded back in the width direction so that the sealant layers face each other, and the edges on both sides are overlapped In addition, while continuously making a large number of packaging bags from the packaging film, each packaging bag contains foods, seasonings, pharmaceuticals, cosmetics, and other liquid or viscous or jelly-like fluid substances. As shown in FIG. 1, the film folding part 1, the vertical seal part forming part 2, and the packaged article supply part 3 A lateral seal forming portion 4 as an embodiment of a transverse sealing apparatus of the invention, it comprises a cutting unit 5, individual sections will now be described.

  In the film folding portion 1, while a single long packaging film 6 that is continuously fed from the film roll R and travels continuously from top to bottom, a U-shape and an inverted L-shape during the travel. The packaging film 6 is folded back in the width direction while being guided by the two guide rods 7 in the shape so that the sealant layers face each other, and the both side edges located at the left end of the packaging film 6 are shown in the figure. Overlapping.

  In the vertical seal portion forming portion 2, both side edges overlapped and overlapped with the packaging film 6 are continuously pressed and heated in the longitudinal direction (vertical direction) of the packaging film 6 by a pair of vertical seal rolls 8. The vertical seal portion 6a is formed, thereby forming the packaging film 6 in a cylindrical shape.

  The vertical seal portion forming portion 2 includes a pair of vertical seal rolls 8 (shown only on the front side in FIG. 1) extending horizontally in parallel with each other, and a gear set (not shown). One of the pair of vertical seal rolls 8 so as to urge the pair of vertical seal rolls 8 toward each other in a direction opposite to each other and at a constant speed via And a pair of air cylinders 10 provided at bearings for supporting both ends of a support shaft of a certain illustrated vertical seal roll 8.

  Here, each of the pair of vertical seal rolls 8 has one annular flange 8a on the outer peripheral surface thereof, and a heater (not shown) for heating the annular flange 8a therein, and the pair of air cylinders 10 described above. The both side edges of the packaging film 6 are heated by the heat transmitted from the heater to the annular flange 8a while being pressed between the annular flanges 8a with the pressing force of While the sealant layers are welded together to form the vertical seal portion 6a, the packaging film 6 is caused to travel downward by the rotation.

  In the article supply unit 3, the article M supplied from a tank (not shown) via a pump (not shown) and a supply path passes through the pair of vertical seal rollers 8 from above to below. The nozzle 11 is used to continuously or intermittently fill the inside of the packaging film 6 formed in a cylindrical shape.

  In the horizontal seal portion forming portion 4, the packaging film 6 formed in a cylindrical shape is pressurized while being heated over the entire width by a pair of horizontal seal rolls 12 at a constant interval corresponding to the width of the packaging bag in the longitudinal direction. Then, the transverse seal portions 6b are intermittently formed to be welded to each other, whereby a large number of packaging bags W are continuously made in a state where they are connected in the longitudinal direction of the packaging film 6.

  FIGS. 2A and 2B are a plan view and a front view showing the configuration of the horizontal seal portion forming portion 4 of the above embodiment. As shown in FIG. A pair of horizontal seal rolls 12 (only the one on the near side is shown in FIG. 1), and bearing portions 13 that rotatably support both ends of the respective support shafts 12c of the pair of horizontal seal rolls 12 and those A support mechanism 15 having two pairs of guide rods 14 for supporting adjacent bearing portions 13 so as to be movable toward and away from each other, and a pair of lateral seal rolls 12 by a motor 17 via a gear set 16. One of the pair of horizontal seal rolls 12 so as to urge the pair of horizontal seal rolls 12 toward each other toward the drive mechanism 18 that is rotationally driven in the opposite direction and at the same speed. is there Has a biasing mechanism 19 provided adjacent to the bearing portion 13 both ends of the support shaft 12c of the lateral seal rolls 12 for supporting respectively shown in 1, the.

  Here, the two pairs of guide rods 14 are respectively fixed at both ends to the base member 15a and the tip member 15b of the support mechanism 15 and extend between them, and the pair of horizontal seal rolls 12 are parallel to each other. In addition, they extend horizontally and are supported so as to be movable toward and away from each other.

  Further, each of the pair of horizontal seal rolls 12 has a plurality of (six in the figure) seal bars 12a that are positioned at equal intervals in the circumferential direction on the outer peripheral surface and extend in the axial direction, and the seal bars. And a pair of annular flanges 12b positioned on both outer sides of both ends of 12a, and a heater (not shown) for heating the seal bars 12a therein, and the pair of horizontal seal rolls 12 The dimensions of each part are set so that no gap is created between the seal bars 12a located at positions facing each other of the pair of horizontal seal rolls 12 in a state where the pair of annular flanges 12b are in contact with each other.

  3A and 3B are a front view and a cross-sectional view showing the horizontal seal portion forming portion in an enlarged manner. As shown in the drawing, the urging mechanism 19 of the horizontal seal portion forming portion 4 is A high pressing force air cylinder 19a and a low pressing force air cylinder 19b are provided for each of the bearing portions 13 that support both ends of the support shaft 12c of the seal roll 12 respectively.

  Specifically, the air cylinder 19a for high pressing force and the air cylinder 19b for low pressing force are specifically formed by using two tip members 15b as cylinder bodies and forming the tip members 15b in opposite directions to the bearing portions 13. A high pressure piston 19e and a low pressure piston 19f are formed in a rectangular hollow pressure recess 19c and a cylindrical low pressure recess 19d formed in each tip member 15b toward the bearing portion 13. Are inserted in a gas-tight manner through a seal ring so as to be slidable in the advancing / retreating direction (extending direction of the guide rod 14) with respect to the bearing portion 13, and each of the two tip members 15b has a high pressing force. An air passage (not shown) for supplying high-pressure air is formed in the recess 19c for use and the recess 19d for low pressing force.

  In addition, the pressure receiving area of the high pressing force piston 19e and the low pressing force piston 19f, that is, the cross-sectional area of the cross section perpendicular to the sliding direction, is higher for the high pressing force piston 19e than for the low pressing force piston 19f. Thus, even if high pressure air of the same pressure is supplied from the air passage, the high pressing force piston 19e is approximately 1.5 times larger than the low pressing force piston 19f. A pressing force is generated.

  A high pressing force piston rod 19g is fitted and fixed to the high pressing force piston 19e, and a low pressing force piston rod 19h is integrally formed with the low pressing force piston 19f. The rod 19g is inserted into a through hole formed in the center of the low pressing force piston rod 19h, and is slidably supported by a low friction bush 19i provided in the through hole. The high pressure air cylinder 19a and the low pressure air cylinder 19b are arranged in tandem on the same axis.

  Here, the two tip members 15b each have a square plate-shaped high pressing force lid member 19j for airtightly covering the high pressing force recess 19c and a disk-shaped disk for covering the low pressing force recess 19d in an airtight manner. A low pressing force lid member 19k is attached to the outer peripheral surface of the low pressing force piston rod 19h. The two engaging grooves are positioned 180 degrees apart from each other in the circumferential direction and extend in the tangential direction. Are formed, and two brackets 19l fixed to the end face of the bearing portion 13 engage the tip portions of these bracketing grooves, and the tip portion of the low pressing force piston rod 19h is coupled to the bearing portion 13. .

  The piston rod 19g for high pressing force penetrates the piston 19e for high pressing force, and the base end portion (the left end portion in FIG. 3B) of the piston rod 19g for high pressing force is the lid member 19j for high pressing force. The liquid-tight slidably penetrates and protrudes to the outside. A male screw is formed on the outer peripheral surface of the base end, and a clearance adjusting ring 19m is screwed to the male screw. Further, a clearance fixing plate 19n is fixed to the tip of the base end portion so as to overlap the clearance adjusting ring 19m.

  On this clearance fixing plate 19n, a clearance fixing pin 19o is fitted and fixed on a double concentric circle at a predetermined angular pitch (7.5 ° pitch in the illustrated example) and shifted by 180 ° in the circumferential direction. Each of these clearance fixing pins 19o holds a steel ball at a tip portion facing the clearance adjustment ring 19m, and presses the steel ball in the advance direction by a built-in spring. On the other hand, on the side surface of the clearance adjustment ring 19m facing the clearance fixing plate 19n, the clearance is fixed over the entire circumference of the double concentric circle facing the double concentric circle of the clearance fixing plate 19n where the clearance fixing pin 19o is located. A number of substantially hemispherical or conical recesses are formed at the same pitch as the fixing pins 19o. Further, on the side surface of the clearance adjustment ring 19m facing the high pressing force lid member 19j, an annular convex portion is formed at the center portion so as to surround the high pressing force piston rod 19g, and this clearance adjustment ring 19m. The abutment convex portion abuts against the high pressing force lid member 19j, so that the high pressing force piston rod 19g is advanced to the advance limit position, and at the advanced limit position, the tip of the high pressing force piston rod 19g and the bearing portion 13 are The clearance between the annular flanges 12b of the pair of horizontal seal rolls 12 when the end surfaces come into contact with each other is specified.

  As a result, the steel balls at the tips of the plurality of clearance fixing pins 19o that protrude from the side surface of the clearance fixing plate 19n are respectively pressed by the springs and fitted into the recesses on the side surface of the clearance adjusting ring 19m, so that the clearance The adjustment ring 19m is positioned in the rotational direction with respect to the clearance fixing plate 19n. In this state, the clearance adjustment ring 19m is fixed around the high pressing force piston rod 19g against the spring of the clearance fixing pin 19o. When it is rotated with respect to the plate 19n, the steel ball at the tip of the clearance fixing pin 19o is pushed back and once disengages from the concave portion on the side surface of the clearance adjusting ring 19m. Fits into the clearance adjustment ring 19m It is repositioned in the rotational direction.

  During the rotation of the clearance adjusting ring 19m, the clearance adjusting ring 19m is slightly moved toward or away from the high pressing force lid member 19j by the external thread on the outer peripheral surface of the proximal end portion of the high pressing force piston rod 19g ( For example, when the clearance adjustment ring 19m is appropriately rotated, the advance limit position of the high pressing force piston rod 19g can be finely adjusted.

  4 (a) to 4 (c) and FIGS. 5 (a) and 5 (b) are explanatory views showing the operating state of the horizontal seal portion forming portion 4 of the above embodiment. Thus, the support mechanism 15 has a plurality of seal bars 12a positioned at equal intervals around the periphery and annular flanges 12b positioned on both outer sides of both ends of the seal bars 12a to form a pair of horizontal seal rolls. 12 are supported parallel to each other and movable toward and away from each other, and a drive mechanism 18 rotates the pair of transverse seal rolls 12 at the same speed relative to each other, as indicated by arrows in the figure, and The urging mechanism 19 urges the paired lateral seal rolls 12 toward each other, so that the annular flange 12b of one lateral seal roll 12 and the annular flange 12b of the other lateral seal roll 12 Contact Further, as the horizontal seal rolls 12 rotate, the gap between the seal bars 12a is secured until the seal bars 12a come to positions facing each other to prevent unnecessary contact of the seal bar 12a with the film 6. When the seal bars 12a come to positions facing each other as the horizontal seal rolls 12 rotate, the horizontal seal roll 12 is pressed while the film 6 is sandwiched between the seal bars 12a to heat and press the film 6. The sealant layers of the superposed film 6 are welded to each other, and a transverse seal portion 6 b extending in the width direction is intermittently formed on the film 6 in the longitudinal direction of the film 6.

  At that time, the low pressing force cylinder 19b of the urging mechanism 19 has both ends of the support shaft 12c of one horizontal seal roll 12 positioned on the lower side in FIG. As shown in FIG. 4 (a), the bearing portions 13 that respectively support the portions are moved in the direction in which the horizontal seal rolls 12 approach each other by the low pressing force piston rod 19h of the low pressing force piston 19f. 12b is pressed to a position where the two come into contact with each other, and in that state, the seal bar 12a that has come to a position facing each other with the rotation of the paired horizontal seal rolls 12 sandwiches the film 6 therebetween, 4 (b), the seal bar 12a is pushed by the film 6, and one horizontal seal roll 12 is pushed back in a direction away from the other horizontal seal roll 12, and the bearing portion When 3 moves backward from the position where the annular flanges 12b abut against each other, the bearing portion 13 corresponds to a predetermined distance, for example, the set thickness of the lateral seal portion 6b, for example, the thickness of two base film layers of the film 6 For example, one side seal roll 12 is pressed toward the other side seal roll 12 by the lower pressing force of the low pressing force cylinder 19b than the high pressing force cylinder 19a until it moves backward by 30 μm, for example. Thus, the mutually opposite seal bars 12a of the lateral seal rolls 12 reliably form the lateral seal portion 6b on the film 6 with a low constant pressure.

  When the opposite seal bars 12a of the horizontal seal roll 12 sandwich the film 6 between them, the bearing portion 13 of the one horizontal seal roll 12 has the predetermined distance from the position where the annular flanges 12b abut against each other. When one of the horizontal seal rolls 12 is further pushed back so as to move backward to, for example, 80 μm, as shown in FIG. 4 (c), the high pressing force cylinder 19a is moved to the high pressing force piston 19e. The tip of the piston rod 19g for high pressing force is brought into contact with the bearing portion 13 of the horizontal seal roll 12, and the bearing portion 13 is pressed with a constant pressing force that is higher than the pressing force of the low pressing force cylinder 19b. The position where the bearing portion 13 is moved by a predetermined distance corresponding to the set thickness of the lateral seal portion 6b from the position where the annular flanges 12b abut against each other. To return to, extruded lateral seal rolls 12, suppressing the bouncing behavior of the lateral seal rolls 12. At this time, since the pressing force from the high pressing force piston 19e of the high pressing force cylinder 19a and the pressing force from the low pressing force piston 19f of the low pressing force cylinder 19b are simultaneously applied to the bearing portion 13, The pressing force of the two cylinders 19a and 19b is added.

  Thereafter, as shown in FIG. 5A, as the horizontal seal roll 12 rotates, the seal bars 12a move away from the positions facing each other. Meanwhile, the low pressing force cylinder 19b is moved to the one horizontal seal roll. As shown in FIG. 5 (b), as shown in FIG. 5 (b), until the position where the annular flanges 12b contact each other, as shown in FIG. The horizontal seal roll 12 is advanced. When the pressurized air is supplied into the low pressing force recess 19d on the low pressing force piston rod 19h side, the low pressing force cylinder 19b pulls the bearing portion 13 with the low pressing force piston rod 19h. The high pressing force piston 19e and the low pressing force piston 19f are moved back to the retreat limit position.

  Therefore, according to the horizontal seal portion forming portion 4 of this embodiment, the high pressing force cylinder 19a is not moved when the bearing portion 13 moves beyond a predetermined distance from the position where the annular flanges 12b abut against each other. Since the horizontal seal roll 12 is pressed with a high pressing force, the bounce behavior of the horizontal seal roll 12 can be suppressed, and the bearing portion 13 from the position where the annular flanges 12b abut each other to a predetermined distance. For the movement, the horizontal seal portion 12b can be formed on the film 6 by pressing the horizontal seal roll 12 with the low pressing force of the low pressing force cylinder 19b and with the low and constant pressing force of the horizontal seal roll 12. Further, damage to the lateral seal portion 6b due to excessive pressure can be sufficiently avoided.

  Further, according to the horizontal seal portion forming portion 4 of this embodiment, the high pressing force cylinder 19a and the low pressing force cylinder 19b are arranged in tandem on the same axis, and the high pressing force cylinder 19a Since the piston rod 19g for pressing force penetrates the piston rod 19h for low pressing force 19b of the low pressing force cylinder 19b slidably, the advance limit position of the cylinder 19a for high pressing force is set to the position of the cylinder 19b for low pressing force. By setting it behind the advancing limit position, the two-stage pressing force urging mechanism 19 can be easily constructed, and when the high pressing force cylinder 19a applies a pressing force to the bearing portion 13, it is low. Since the pressing force cylinder 19b can simultaneously apply a pressing force to the bearing portion 13, the high pressing force cylinder 19a can be made compact.

  Furthermore, according to the horizontal seal portion forming portion 4 of this embodiment, the high pressing force cylinder 19a has a larger pressure receiving area than the low pressing force cylinder 19b, so that the high pressing force cylinder 19a has the same air body pressure. A high pressing force and a low pressing force of the low pressing force cylinder 19b can be easily realized.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, the material and lamination of the packaging film 6 The structure can be appropriately selected from known structures according to the type and amount of the packaged object. Further, instead of folding and overlapping one long packaging film 6 fed from one film roll R in the film folding portion 1 in the width direction, each film roll R is continuously fed from the two film rolls R, respectively. Alternatively, two long packaging films 6 that run can be overlapped by being sandwiched between two rollers.

  Further, when the high pressing force cylinder 19a of the horizontal seal portion forming portion 4 is operated, the low pressing force cylinder 19b is simultaneously operated to apply the pressing force, so that the pressure receiving areas of these cylinders may be the same, and vice versa. Alternatively, the high pressing force cylinder 19a may be made smaller. Further, the high pressing force cylinder 19a and the low pressing force cylinder 19b are arranged in series (tandem) in the above example, but may be arranged in parallel.

  Thus, according to the lateral sealing device of the present invention and the filling and packaging device including the same, the movement of the bearing portion of the high pressing force cylinder with respect to the movement beyond the predetermined distance from the position where the annular flanges abut each other. Since the horizontal seal roll is pressed with a high pressing force, the horizontal seal can be reliably formed on the film, and the movement of the bearing portion from the position where the annular flanges abut against each other to a predetermined distance is low. By pressing the horizontal seal roll with the low pressure of the pressure cylinder and forming a horizontal seal part on the film with a constant and constant pressing force of the horizontal seal roll, damage to the horizontal seal part due to excessive pressure is also possible. It can be avoided sufficiently.

DESCRIPTION OF SYMBOLS 1 Film folding | returning part 2 Vertical seal part formation part 3 Package supply part 4 Horizontal seal part formation part 5 Cutting part 6 Packaging film 6a Vertical seal part 6b Horizontal seal part 7 Guide rod 8 Vertical seal roll 8a Annular flange 9 Motor 10 Air Cylinder 11 Filling nozzle 12 Horizontal seal roll 12a Seal bar 12b Annular flange 12c Support shaft 13 Bearing portion 14 Guide rod 15 Support mechanism 15a Base member 15b Tip member 16 Gear set 17 Motor 18 Drive mechanism 19 Energizing mechanism 19a Air for high pressure force Cylinder 19b Air cylinder for low pressing force 19c Concave for high pressing force 19d Concave for low pressing force 19e Piston for high pressing force 19f Piston for low pressing force 19g Piston rod for high pressing force 19h Piston rod for low pressing force 19i Low friction bush 19j For high pressing force Lid member 19k Lid member for low pressing force 19l Bracket 19m Clearance adjustment ring 19n Clearance fixing plate 19o Clearance fixing pin M Packaged object R Film roll W Packaging bag

Claims (4)

A pair of long films that are overlapped and run in the longitudinal direction have a plurality of seal bars that are circumferentially spaced at equal intervals and annular flanges that are located on both outer sides of the seal bars. In a horizontal seal device that forms a horizontal seal portion intermittently extending in the longitudinal direction of the film by heating and pressing with a horizontal seal roll to be welded to each other and extending in the width direction of the film.
A support mechanism that has bearings for supporting both ends of each of the support shafts of the pair of transverse seal rolls, and supports the pair of transverse seal rolls in parallel with each other so as to be close to and away from each other;
A drive mechanism for rotating the pair of transverse seal rolls in the opposite directions at a constant speed;
An urging mechanism for urging the pair of transverse seal rolls toward each other in an approaching direction;
With
The biasing mechanism includes a low pressing force cylinder that presses the bearing portion of the support mechanism in a direction in which the lateral seal rolls approach each other to a position where the annular flanges abut each other;
A high pressing force cylinder that presses the bearing portion of the support mechanism in a direction in which the lateral seal rolls approach each other to a position that is a predetermined distance behind the position where the annular flanges contact each other. Lateral seal device. The high pressure cylinder and the low pressure cylinder are arranged on the same axis,
The transverse seal device according to claim 1, wherein the piston rod of the high pressure cylinder penetrates the piston rod of the low pressure cylinder slidably.   The horizontal sealing device according to claim 1, wherein the high pressure cylinder has a larger pressure receiving area than the low pressure cylinder. A longitudinal seal is produced by pressing one side of the packaging film folded in the width direction or two packaging films stacked on each other in the longitudinal direction while heating the side edges of the packaging film with longitudinal seal rolls. The packaging film is formed into a cylindrical shape by continuously forming the portion, and the cylindrical packaging film is pressurized while being heated in the width direction by the horizontal sealing roll of the horizontal sealing device. Forming a packaging bag by intermittently forming a transverse seal portion over the entire width at intervals in the longitudinal direction, and forming a transverse seal portion on a cylindrical packaging film from the next transverse seal portion In the filling and packaging apparatus for filling the packaging material into each packaging bag by supplying the packaging material into the packaging film until the formation of or continuously,
A filling and packaging apparatus comprising the horizontal sealing apparatus according to any one of claims 1 to 3 as the horizontal sealing apparatus.

Images