JP2013163268A - Bag making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag making machine that is simple, inexpensive, and automated to further reduce the influence of overheating by each seal bar when a bag making machine is shifted from an operating state to a stopped state.SOLUTION: A bag making machine makes a soft wrapping bag that can stand by itself after the content is filled, by performing melt adhesion on a bottom material film and a trunk material film to seal the bottom and the side, includes a heating body for adding the heat, and has a seal part for pressuring to seal while pinching and heating the bottom material film and the trunk material film. The seal part includes: a first seal unit that vertically moves above the film; and a second seal unit that is fixed under the film. The first seal unit includes a first overheat prevention mechanism. The second seal unit includes a second overheat prevention mechanism. When shifted from a sealing operation to a stopped state, the machine prevents the film from being overheated by the first overheat prevention mechanism and the second overheat prevention mechanism.

Description

  The present invention relates to a bag making machine that manufactures a flexible packaging bag (standing pouch) that has a bottom gusset portion that is composed of a bottom material and a body and that is closed at both ends, and can be self-supported after filling the contents.

  As an example of a bag making machine for producing a standing pouch that is a subject of the present invention, there is a bag making machine described in Patent Document 1.

  A method for making a two-row standing pouch using this bag making machine and the main part of the bag making machine will be described. 1A and 1B are diagrams showing an outline of a standing pouch. FIG. 1A is a plan view of the standing pouch, and FIG. 1B is a bottom view of the standing pouch. As for the body 201, the raw material of a wide body film is continuously sent out by the feeding roll. Then, the slit film in the center and the separated films each pass through a pair of dancer rolls. The continuously fed film is intermittently fed due to the sealing operation after the dancer roll. The dancer roll is for storing the film and maintaining the tension between continuous feed and intermittent feed. The bottom material 202 is a pair of narrow bottom material films that are fed from a raw material provided separately from the body, folded in the width direction, and punched by a punch in the folded state. Thereafter, they are sandwiched between the pair of body films and overlapped. The opening of the folding of the bottom material film is sandwiched so as to be outside the body film. This part forms the bottom gusset part. Both ends in the width direction of the body film are sealed in a different shape by the bottom seal portion. The bottom material and the pair of body materials are sealed in different shapes, and the body materials are sealed through the punch holes 203. Thereby, the bottom gusset part which both ends closed is formed. Next, the film group is guided to a lateral seal portion for closing both sides in the width direction of the bag. In the horizontal seal portion, heat sealing is performed in the width direction at the flow direction pitch of the bottom gusset portion, and both side seal portions in the width direction of the bag are formed. After that, it passes through a slitter, and the central part and both end parts are slit at the height pitch of the bag in the flow direction. Finally, it is cut by a cutter in the width direction of the bag at a constant pitch, and is made into a bag.

  If the bag making machine stops while the seal is in operation, the seal part will not cool down immediately, so it will be overheated by the radiant heat from the hot seal bar, and the packaging near the seal bar. The film of material is exposed to a high temperature atmosphere for a longer time than usual. For this reason, the film of the part exposed to the high temperature atmosphere will elongate, deteriorate or deteriorate. For example, when the film stretches, the printing pitch changes, and the pattern at the heat seal position calculated backward from the sensor position that controls the film feed shifts, resulting in poor sealing. Moreover, the thing which wrinkles generate | occur | produced or turned yellow turns into inferior goods. For this reason, normally, when restarting, a film of a certain length must be initially discharged, so that the film material is wasted.

  Proposals have been made to alleviate the influence of the overheating (fogging) (Patent Document 2).

  In Patent Document 2, the seal bar and the heater that move up and down on the upper side of the film are moved further upward than the top dead center during normal operation to stop the distance between the film and the seal bar. It is intended to reduce the influence of film blur due to the radiant heat of the seal bar.

Regarding the drive mechanism when the bag making machine is operating normally, the heater on the movable side of the film is connected to the beam, and when the beam moves up and down, multiple heaters connected to the beam move up and down at the same time. To do. The beam is connected to the narrow diameter portion of the shaft where the narrow diameter portion of the stepped shaft is eccentric via the link, and the beam moves up and down via the link by rotating the stepped shaft. Become.

  A driven link is fixed to the large-diameter portion of the stepped shaft, and the driven link is connected to the drive link via an intermediate link to form a parallel link. A connecting link is connected to the front end of the drive link, and the other end of the connecting link is connected to the motor via a crank.

  When the motor rotates, the connecting link and drive link swing through the crank, the driven link swings through the intermediate link, the stepped shaft fixed to the driven link rotates, and the beam moves up and down. As a result, the heater and the seal bar can move up and down.

  Depending on the swing angle of the driven link, the stepped shaft does not rotate 360 °, but the top dead center is determined, and a margin for moving the beam further upward remains.

  When the bag making machine is in operation, the clutch is disengaged and the drive mechanism and the large diameter portion of the stepped shaft are free. However, when the bag making machine is stopped, when the heater and the seal bar move upward, another drive mechanism is connected to the large diameter portion of the stepped shaft via a clutch. The clutch is connected, and the large diameter portion of the stepped shaft and the drive mechanism are connected. The stepped shaft is further rotated by the drive mechanism from the time of operation, and the heater and the seal bar are moved further upward from the top dead center at the time of operation. At this time, the intermediate link connecting the driven link, which is separately fixed to the large diameter portion of the stepped shaft, and the motor and the other link portion is provided with a folding mechanism, the mechanism is unlocked, and the intermediate link The link extends to accommodate further shaking of the driven link due to the rotation of the stepped shaft.

  However, as described above, the method of moving the unit holding the seal bar away from the film requires a complicated mechanism and a large power actuator, particularly in the case of the operation side unit, and requires a large equipment cost. have.

  In addition, when the bag making machine is stopped, the operator manually puts the heat shield plate between the film and the seal bar to reduce the appearance of the film due to the radiant heat of the seal bar. Since the seal unit is often covered with a safety cover, the work becomes complicated and time-consuming, and the production efficiency is lowered.

Japanese Patent Laid-Open No. 6-170989 JP 2006-142749 A

  In view of the above problems, the present invention provides a simple, low-cost and automated bag-making machine in order to reduce the influence of burring caused by each seal bar when the bag-making machine is stopped from operation. The purpose is to provide.

As a means for solving the above-mentioned problems, the invention according to claim 1 is a flexible packaging in which a bottom film and a body film are melt-bonded to form a bottom seal and a lateral seal, and can be self-supported after filling the contents. A bag making machine for producing bags,
It has a heating part that adds heat, and has a seal part that presses and seals while sandwiching the bottom film and body film,
The seal part is composed of a first seal unit that moves up and down on the upper side of the film, and a second seal unit fixed on the lower side of the film,
The first seal unit has a first overheating prevention mechanism, and the second sealing unit has a second overheating prevention mechanism,
The first overheating prevention mechanism is a means for inserting a sheet metal that blocks heat between the heating body, the bottom film and the body film,
The second overheating prevention mechanism is a means for moving the second seal unit part in a direction away from the bottom film and the body film,
In the bag making machine, the first overheating prevention mechanism and the second overheating prevention mechanism prevent the film from being overheated when the seal operation is shifted to the stop state.

The invention described in claim 2 is configured such that the means for inserting the sheet metal includes an actuator, an internal link and an external link, and an L-shaped metal plate.
The inner link is configured such that, of its both ends, the frame side end is fixed to the rotation center, and the opposite outer end can freely rotate on a circumferential track centering on the rotation center. Has been
The inner end of the outer link is connected to the outer end of the inner link, while the outer end of the outer link is fixed to the L-shaped metal plate,
The L-shaped metal plate is arranged so as to be freely movable along a horizontal trajectory, and a part thereof constitutes the sheet metal,
The head side end of the actuator is fixed to the connecting part between the outer end of the internal link and the inner end of the external link, and this actuator can be expanded and contracted in the direction intersecting the trajectory in the horizontal direction. Is composed of
The connection portion is rotated on the circumferential track by expansion and contraction of the actuator, and the L-shaped metal plate is moved along the horizontal track along with the rotation, and the heating body and the bottom material film are moved. 2. The bag making machine according to claim 1, wherein the sheet metal is inserted or withdrawn between the body film and the body film.

  The invention according to claim 3 is the bag making machine according to claim 1 or 2, wherein a heat insulating plate is attached to the film surface side of the sheet metal.

  The invention according to claim 4 is characterized in that a heat insulating plate is provided in the non-seal portion of the heating body of the first seal unit and the second seal unit. It is a bag making machine.

  According to the bag making machine of the present invention, since it has a simple structure, it is inexpensive, the influence of heat from the seal bar of the seal portion can be reduced, and the influence of overheating of the film (hereinafter referred to as tinting) is reduced. I can do it.

The figure which shows the outline of a standing pouch. (A) shows a plan view. (B) shows a bottom view. The figure which shows the bag making machine of this invention of this invention. The schematic of the bottom seal unit which equipped with the overheating prevention mechanism of the bag making machine of the present invention. The figure which shows a 1st overheating prevention mechanism by the C-C 'arrow line view in FIG. The figure which shows the seal bar used for the 2nd seal unit which concerns on this invention. (A) shows a plan view. (B) shows a side view. The figure for demonstrating the effect of the overheating prevention mechanism which concerns on this invention.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a view showing an example of a bag making machine for producing a standing pouch having two lines, which is a bag making machine according to the present invention. The flow of main steps will be described with reference to FIG.

  The raw material 1 of the wide body is continuously fed out by the feeding roll 2. By the slitter and the M-shaped plate 3, the body is slit at the center and separated vertically. Each separated film passes through a pair of dancer rolls 8.

  A pair of narrow bottom raw material 4 provided separately from the body raw material is fed by a feed roll 5. The bottom material is folded in the width direction by a triangular plate (not shown) after the dancer roll 6. The punch 7 is punched in a folded state. Thereafter, the feed roll 9 sandwiches the pair of upper and lower body films at both ends in the width direction. The opening of the folding of the bottom material film is sandwiched so as to be outside the body film.

  The film group of the body material and the bottom material is intermittently fed by the feeding roll 9 due to the sealing operation. The dancer rolls 6 and 8 are for storing the film and maintaining the tension between continuous feed and intermittent feed.

  The feed roll 9 and the intermediate feed roll 13 are synchronized, and the mark sensor 10 detects a picture and feeds back the information to control the film feed.

  The bottom seal unit 11 seals both ends of the body film in the width direction in an irregular shape. The bottom material and the pair of body materials are heat-sealed in different shapes, and the body materials are heat-sealed through the punch holes. Thereby, the bottom gusset part which both ends closed is formed. Thereafter, the film is cooled and pressed by the bottom seal cooling unit 12 to prevent the film from being stretched or wrinkled.

  Thereafter, the film group is guided to the horizontal seal unit 15. Thereafter, heat sealing is performed in the width direction at the pitch in the flow direction of the bottom gusset portion to form both side seal portions in the width direction of the bag. Next, it is cooled and pressed by the horizontal seal cooling unit 16 to prevent the film from being stretched or wrinkled.

  The mark sensor 17 detects the pattern, feeds back the detection information, and controls the film feed of the downstream feed roll 19. By using the mark sensors 10 and 17 and the two sensors, the bottom seal and the horizontal seal can be more accurately aligned with the printed pattern. The dancer roll 14 is for correcting a difference in film feed between the downstream feed roll 19 and the feed roll 9 and the intermediate feed roll 13.

  After the horizontal seal cooling unit 16, a slitter 18 slits the central portion and both end portions at a bag height pitch in the flow direction. Thereafter, the cutter 20 cuts the bag at a pitch in the width direction of the bag to make a bag. Finally, it is carried out by the delivery 21.

  The case where the film overheating prevention mechanism of the bag making machine is applied to the bottom seal unit 11 will be described in detail as an example.

In FIG. 3, the schematic of the bottom seal unit 22 which comprised the overheating prevention mechanism of the bag making machine of this invention is shown. A plurality of stacked film groups (hereinafter referred to as films) 30 are sandwiched between the arrows 23a on the upper side.
Is a first seal unit 23 that moves in the up-down direction, and a lower side is a second seal unit 24 that is fixed and does not move even during bag making.

  At the time of bag making, the first seal unit 23 provided above the film 30 has a seal bar 26 with a heat insulating plate 25 attached to a non-sealing surface fixed to a heater 27. 29 is fixed. On the other hand, the second seal unit 24 at the time of bag making faces the first seal unit 23 with the film 30 in between. In the second seal unit 24, a seal bar 34 with a heat insulating plate 25 attached to a non-seal surface is fixed to a heater 35, and the heater 35 is fixed to a frame 37 via a heat insulating plate 36. The film 30 is conveyed in the direction of arrow D. The direction of the arrow D is the longitudinal direction of the bag, and the depth direction of the paper plane perpendicular to the direction is the width direction of the bag.

  The frame 29 is combined with the guide 31 so as to be movable in the width direction. A shaft 32 is passed through the guide 31. The lower portion of the shaft 32 is fixed to a beam (not shown), and the beam is connected to a power unit (not shown) via a link mechanism (not shown), and moves in the vertical direction indicated by an arrow 23a. As the beam moves up and down, the shaft 32 also moves up and down, and the seal bar 26 is pressed against the seal bar 34 of the second seal unit 24 with the film 30 in between when the bag is made. Thus, heat is applied from the seal surfaces 48 and 49 provided on and in contact with the seal bar 26 and the seal bar 34 to perform heat sealing.

  A description will be given of both seal units when the bag is stopped during bag making. Of the bottom seal unit when stopped at the time of bag making, the second seal unit 24 is lowered and moved in a direction away from the film 30 by a drive mechanism (not shown) which is a second overheating prevention mechanism. Thereby, when it stops at the time of bag making, the influence of the blur of the film 30 is relieved. The drive mechanism can be achieved by a simple mechanism using, for example, an air cylinder and a simple link mechanism, but is not limited thereto, and various mechanical configurations may be adopted.

  On the other hand, a complicated mechanism is required to move the movable first seal unit 23 away from the film when bag making is stopped. In the present invention, a seal bar for preventing blurring is used without using a complicated mechanism. Is provided with an overheating preventing mechanism 22 using a simple mechanism for covering the surface with a heat insulating plate.

  FIG. 4 is an arrow view as seen from C-C ′ in FIG. 3 and shows the first overheating prevention mechanism 22. The first overheating prevention mechanism 22 will be described in detail with reference to FIG.

  The first overheating prevention mechanism 22 is provided in the first seal unit 23, and is an extendable actuator 42 that is a means for inserting a sheet metal that cuts off heat, an internal link 38 and an external link 39, and an L-shape. The inner link 38 is fixed to an inner link fixing bracket whose frame side end portion is a rotation center, and an outer end portion on the opposite side is fixed to the inner link 38. It is configured to be able to freely rotate on the circumferential track 22a around the rotation center.

  The inner end of the outer link 39 is connected to the outer end of the inner link, while the outer end of the outer link fixes an L-shaped metal plate 46 with an outer link fixing bracket 45. The L-shaped metal plate 46 is disposed so as to be freely movable in the direction indicated by the arrow 46a along the horizontal trajectory, and a part of the L-shaped metal plate 46 constitutes the sheet metal 46b. The head side end is fixed to the connecting portion between the outer end of the inner link and the inner end of the outer link, and the actuator is configured to be extendable in the direction intersecting the horizontal trajectory. Yes.

  The connection portion is rotated on the circumferential track 22a by the expansion and contraction of the actuator 42, and the L-shaped metal plate 46 is moved along the track in the horizontal direction in accordance with the rotation. The sheet metal 46b is inserted between or retracted. An air cylinder is used for the actuator 42.

  The L-shaped metal plate 46 can be moved in the horizontal direction indicated by an arrow 46a through a guide shaft 40 fixed to the frame 29, and the shaft receiver 41 can be smoothly moved in the horizontal direction even when a vertical force is applied. A linear bushing with small frictional force was used so that it could move.

  As the inner link 38 swings on the circumferential track 22a, the L-shaped metal plate 46 constrained so as to be only movable in the horizontal direction reciprocates in the horizontal direction indicated by the arrow 46a via the outer link 39. Exercise. The metal plate 46b at the bottom of the L-shaped metal plate 46 with the reciprocating motion exposes the lower side of the seal bar 26 when the air cylinder 42 is extended, while the seal bar is exposed when the air cylinder 42 is contracted. The seal bar 26 is covered by moving below the cover 26. Further, a heat insulating plate 47 is attached to a surface of the sheet metal 46 b at the bottom of the L-shaped metal plate 46 so as to face the seal bar 26.

  Air supply to the air cylinder 42 is switched by a solenoid valve via a tube (not shown). The air supply is switched by controlling the solenoid valve with a programmable logic controller (PLC). When the bag making machine is in operation, air is supplied by the solenoid valve so that the air cylinder 42 extends, and the sheet metal 46b at the bottom of the L-shaped metal plate 46 escapes to the outside of the film 30, and the seal bar 26 To expose. On the other hand, when the bag making machine is stopped, the supply of air is stopped, and the air cylinder 42 is contracted by the solenoid valve so that the sheet metal 46b at the bottom of the L-shaped metal plate 46 covers the seal bar 26. Created a program. As a result, when the bag making machine is stopped, the heat insulating plate 47 affixed to the sheet metal 46 b at the bottom of the L-shaped metal plate 46 covers the sealing surface of the seal bar 26, thereby mitigating the influence of the blurring of the film 30. Further, when the bag making machine is in operation, the sheet metal 46b at the bottom of the L-shaped metal plate 46 escapes from the first seal unit to prevent interference when the film 30 is sealed.

  The metal plate 46b at the bottom of the L-shaped metal plate 46 is located below the seal bar 26, but is installed on one side in the width direction of the upper and lower frames, so that they do not interfere with each other during sealing.

  When covering the sealing surface of the seal bar 26 with a heat insulating plate and letting it escape, if the direction of escape is the direction of the arrow D (FIG. 3), the sealing surface is long in the direction of the arrow D. Space is required to escape, and may interfere with safety cover, cooling unit, etc. In the case of escape to the inner side of the width direction film, when the size of the standing pouch for making a bag is small, the bottom seal unit is brought closer to the inner side of the width direction film, so that the escape space is reduced. For this reason, it is desirable to employ a mechanism for escaping outside the width direction film.

  FIG. 5 shows a seal bar 26 used in the second seal unit 24. 5A is a plan view, FIG. 5B is a side view, the seal bar shown in FIG. 5 is for two surfaces, and the heat insulating plate 25 is provided with a countersunk screw 50 at a portion excluding the seal surface 48 in contact with the heater 35. It is fixed and stuck by. Moreover, although not shown in figure, the heat insulation board is fixed and affixed on the part except the sealing surface which contact | connects the heater of the seal bar used for a 1st seal unit similarly. These heat insulating plates further reduce the influence of tinting.

In the above description, the case where the overheat preventing mechanism is provided in the bottom seal unit 11 shown in FIG. 2 is illustrated, but the present invention can also be applied to the lateral seal unit 15.

  FIG. 6 is a view for explaining the effect of the overheating preventing mechanism according to the present invention. First, when the overheat prevention mechanism is provided in the bottom seal unit 11, the initial discharge portion before the overheat prevention mechanism is installed is the portion A from the bottom seal unit 11 to the most downstream, and the portion A is discharged. By doing so, the pattern shift due to the elongation of the film was prevented. However, when the overheating preventing mechanism according to the present invention is installed in the bottom seal unit 11, the film elongation in the bottom seal unit 11 is eliminated, and as a result, the initial discharge portion is extended from the horizontal seal unit 15 to the most downstream side. Reduced to B part. Furthermore, by applying the overheating prevention mechanism of the present invention to the horizontal seal unit 15 in addition to the bottom seal unit 11, it is not necessary to discharge part B, which can contribute to the reduction of materials.

  As described above, according to the bag making machine according to the present invention, when the bag making machine during bag making stops, the influence of overheating of the film can be reduced. As a result, the material cost can be reduced and the bag making machine can be reduced. It is possible to improve the operation rate. In addition, a simple link mechanism can be used, and an actuator with a low output can be used, so that the influence of film blur can be reduced at low cost.

1 ... Raw material (body)
2 ... Feeding roll 3 ... Slitter and M-shaped plate 4 ... Original fabric (bottom material)
5 ... Delivery roll 6 ... Dancer roll 7 ... Punch 8 ... Dancer roll 9 ... Delivery roll 10 ... Mark sensor 11 ... Bottom seal unit 12 ... Bottom seal cooling unit 13 ... Intermediate feed roll 14 ... Dancer roll 15 ... Horizontal seal unit 16 ... Horizontal seal cooling unit 17 ... Mark sensor 18 ... Slitter 19 ... Downstream feed roll 20 ... Cutter 21 ... Delivery 22 ... Overheating prevention mechanism 22a ... Circumferential track 23 ... First seal unit 23a ... Up / down direction arrow 24 in which the first seal unit moves Second seal unit 25 ... heat insulating plate 26 ... seal bar 27 ... heater 28 ... heat insulating plate 29 ... frame 30 ... stacked in layers Film group (film)
31 ... Guide 32 ... Shaft 33 ... Spring 34 ... Seal bar 35 ... Heater 36 ... Heat insulation plate 37 ... Frame 38 ... Inner link 39 ... Outer link 40 ... Guide shaft 41 ... Shaft support (linear bush)
42 ... Extendable actuator (air cylinder)
43 ... Actuator fixing bracket 44 ... Inner link fixing bracket 45 ... Outer link fixing bracket 46 ... L-shaped metal plate 46a ... Indicates the direction of movement of the L-shaped metal plate Arrow 46b ... Sheet metal 47 ... Thermal insulation plates 48, 49 ... Sealing surface 50 ... Countersunk screw A ... Initial discharge amount B before overheating prevention mechanism installation ... Overheating prevention mechanism (bottom Sealing part) Initial discharge amount after installation C, C ′... Cut surface D...

Claims (4)

A bag making machine that melts and bonds a bottom material film and a body film to perform bottom sealing and lateral sealing, and manufactures a flexible packaging bag that can be self-supporting after filling the contents,
It has a heating part that adds heat, and has a seal part that presses and seals while sandwiching the bottom film and body film,
The seal part is composed of a first seal unit that moves up and down on the upper side of the film, and a second seal unit fixed on the lower side of the film,
The first seal unit has a first overheating prevention mechanism, and the second sealing unit has a second overheating prevention mechanism,
The first overheating prevention mechanism is a means for inserting a sheet metal that blocks heat between the heating body, the bottom film and the body film,
The second overheating prevention mechanism is a means for moving the second seal unit part in a direction away from the bottom film and the body film,
A bag making machine that prevents the film from being overheated by the first overheating prevention mechanism and the second overheating prevention mechanism when the sealing operation is shifted to a stop state. The means for inserting the sheet metal includes an actuator, an internal link and an external link, and an L-shaped metal plate.
The inner link is configured such that, of its both ends, the frame side end is fixed to the rotation center, and the opposite outer end can freely rotate on a circumferential track centering on the rotation center. Has been
The inner end of the outer link is connected to the outer end of the inner link, while the outer end of the outer link is fixed to the L-shaped metal plate,
The L-shaped metal plate is arranged so as to be freely movable along a horizontal trajectory, and a part thereof constitutes the sheet metal,
The head side end of the actuator is fixed to the connecting part between the outer end of the internal link and the inner end of the external link, and this actuator can be expanded and contracted in the direction intersecting the trajectory in the horizontal direction. Is composed of
The connection portion is rotated on the circumferential track by expansion and contraction of the actuator, and the L-shaped metal plate is moved along the horizontal track along with the rotation, and the heating body and the bottom material film are moved. The bag making machine according to claim 1, wherein the sheet metal is inserted into or withdrawn from the body film.   The bag making machine according to claim 1, wherein a heat insulating plate is attached to the film surface side of the sheet metal.   The bag making machine according to any one of claims 1 to 3, wherein a heat insulating plate is provided in a non-seal portion of a heating body of the first seal unit and the second seal unit.