JP6207812B2 - Folding line forming device for packaging film - Google Patents

Description

  The present invention relates to a fold line forming apparatus for packaging film, and more specifically, to a technique suitable for forming a fold line in a direction intersecting with the traveling direction of the packaging film in the course of transporting the belt-like film.

  As is well known, a pillow packaging machine continuously feeds a belt-shaped film wound up on a roll of raw material to a bag making machine, and is made into a cylindrical shape when passing through the bag making machine. . And a cylindrical film is formed by sealing the film superposition | polymerization end which was bag-formed and overlapped cylindrically through the bag making machine with the center seal apparatus arrange | positioned in the downstream of a bag making machine. In addition, a product transport / supply device is arranged on the upstream side of the bag making device, and products transported from the product transport / supply device at predetermined intervals are supplied into the bag making device. As a result, when the product passes through the bag making machine, the product is stored in the cylindrical film at predetermined intervals, and the product is conveyed together with the cylindrical film. Then, a pillow packaging body that encloses the product is manufactured by sealing and cutting the tubular film so as to cross the lateral direction at predetermined intervals in an end seal device arranged on the carry-out side of the pillow packaging machine. The

  Usually, the outer shape of the pillow package is caused by the outer shape of the product to be stored. In other words, when the product is box-shaped, the package is also formed into a box-like shape. However, when a plurality of small articles such as bags and sachets are stored or in the case of a kneaded product, it remains cylindrical. It becomes. Moreover, even if the shape of the product is rectangular, in the case of a soft product such as castella, the outer shape of the package is substantially rectangular, but the corners are rounded.

  On the other hand, by using the film fold line forming device disclosed in Patent Document 1 or the like, the four corners of the package body are squared regardless of the shape of the packaged object, or the fold line is formed along the end seal portion of the package body. The product value of the package can be increased, for example, by folding the end seal part neatly to form a flat bottom surface so as to be self-supporting.

  The film fold line forming apparatus disclosed in Patent Document 1 forms a fold line in the same direction as the traveling direction or in a direction orthogonal to the traveling direction with respect to the belt-like film in the middle of conveyance before being supplied to the bag making machine. It is. The apparatus configuration for forming the fold line in the direction perpendicular to the traveling direction of the strip film related to the present invention (the width direction of the strip film) is specifically arranged to face and sandwich the strip film and rotate synchronously. A first folding / crimping roller and a second folding / crimping roller.

  The first folding roller has a cylindrical rotating body that is longer than the width of the belt-like film, and a first folding portion that is disposed so as to protrude from the outer peripheral surface of the rotating body. Similarly, the second folding roller has a cylindrical rotating body that is longer than the width of the belt-like film, and a second folding portion that protrudes from the outer peripheral surface of the rotating body.

  The first crease part and the second crease part are configured such that the tips thereof come into contact each time the rotating body makes one rotation, and a belt-like film exists between the first crease roller and the second crease roller. In this case, the belt-like film is sandwiched between the tips of the first and second folds and pressed with a predetermined pressure.

  Further, a convex portion for pushing the belt-like film is provided at the tip of the first fold portion, and a concave portion that matches the convex portion is provided at the tip of the second fold portion. Furthermore, the first fold part and the second fold part have built-in heaters.

  Thus, the belt-like film is heated at a predetermined pressure while being heated from both sides by the first folding roller (the convex portion of the first folding portion) and the second folding roller (the concave portion of the second folding portion). By pressurizing, the belt-like film is pressed by the convex portion and a fold line is formed so as to cross in the horizontal direction.

  The elements that form the fold line in the belt-shaped film are the pressure when sandwiched between the convex portion of the first fold portion and the concave portion of the second fold portion, and the softness of the strip film to facilitate deformation (folding). Have a fever. And the main element for making a fold line in the conventional fold line forming apparatus using a pair of crease rollers is exclusively pressure. Therefore, the temperature of the heater does not need to be so high, it is lower than the heater temperature mounted on the sealer in the sealing device in the packaging machine body, and the sealant surface of the surface of the packaging film melts and comes into contact with the fold portion Fold lines can be formed in the transverse direction perpendicular to the traveling direction of the belt-like film without the risk of the melted packaging film sticking.

JP 2009-269676 A

  However, in the conventional fold line forming apparatus described above, the pressure applied to the belt-like film is strong, so that the film is crushed and a fold line such as a scratch is formed. This is particularly noticeable when a thin film material is used. In addition, in the case of the rotary type, since the time during which the pair of folding and crimping rollers sandwich and press the belt-like film is short, there is a possibility that the folding line cannot be formed if the pressure is weakened.

  On the other hand, when the belt-like film is heated and softened to make it easy to deform, and the time during which the belt-like film is sandwiched and pressed is lengthened, a fold line can be formed even with a small pressure. This causes a new problem that the belt-shaped film melts and becomes sticky, adheres to an apparatus that contacts the belt-shaped film, and affects the transport of the belt-shaped film.

In order to solve the above-described problems, a folding line forming apparatus for a packaging film according to the present invention is (0) provided in the middle of transporting a belt-like film in a packaging machine, and folded in a direction intersecting the traveling direction of the belt-like film. A fold line forming apparatus for forming a wrapping film for forming a wire, wherein the middle of the conveyance is between a first feed roller and a second feed roller for applying a conveyance force to the belt-like film, and the first is sandwiched between the belt-like films. The sandwiching blade and the second sandwiching blade are arranged so as to be able to approach and separate while maintaining the state where the opposing surfaces thereof are opposed to each other, and the opposing surface of the first sandwiching blade is arranged in a direction intersecting with the traveling direction of the belt-like film. A first convex portion that extends and a second convex portion that is disposed forward and rearward in the traveling direction of the belt-like film of the first convex portion are provided, and the first convex portion is provided between the first convex portion and the second convex portion. A recess is formed, On the facing surface of the second clamping blade, a recess is provided at a site facing the first projection, a projection is provided at a site facing the first recess, and the first projection of the first clamping blade The belt-like film is sandwiched and pressed with the concave portion of the second sandwiching blade to form the fold line, and in the state where the strip-like film is sandwiched between the first sandwiching blade and the second sandwiching blade, There is a gap between the first concave portion and the convex portion, and the second convex portion and the convex portion are in a positional relationship in which the tips enter each other, and between the second convex portions disposed on the front and rear sides. The fold line is formed in a state where the belt-like film located at a tension is stretched, and the pressure of an air cylinder that applies tension to the belt-like film moving between the first feed roller and the second feed roller is usually set When the pressure is lower than the current pressure, In serial wherein the first clamping blade second clamping edge configured as a state sandwiched with the filmstrip. The first clamping blade corresponds to the cooling side clamping blade 36 in the embodiment, and the second clamping blade corresponds to the heating side clamping blade 37 in the embodiment. As described in the modification, the association of the clamping blades may be reversed. Further, the sandwiching blade may be heated or may not be heated.
(1) A packaging film fold line forming apparatus for forming a fold line in a direction intersecting with the traveling direction of the belt-shaped film, which is provided in the middle of conveyance of the belt-shaped film having only one surface in the packaging machine serving as a heat-sealable sealant surface. Then, a cooling sandwiching blade is disposed so as to face the sealant surface, a heating sandwich blade is disposed so as to face the non-seal surface, and sandwiched between the cooling sandwiching blade and the heating sandwich blade. The fold line is formed by pressing. The folding line forming apparatus for packaging film is realized by the lateral film folding line forming apparatuses 30 and 30 ′ in the embodiment. In the embodiment, the intersecting direction is a direction orthogonal to the traveling direction of the belt-like film, but it is not necessarily required to be orthogonal. The cooling sandwiching blade cools the film surface that comes into contact. In the embodiment, the cooling side fold portion where the cooling sandwiching blade is formed incorporates a cooling means (specifically, a structure for flowing cold water). The cooling means is used for cooling. The heating clamping blade heats the contacting film surface and softens it so as to be easily deformed. In the embodiment, the heating side folding member on which the heating clamping blade is formed is heated by a heating means (specifically, energizing type). The heater is built in and heated by the heat generated by the heating means. The means for cooling and the means for heating are not limited to this, and can be realized by various means.

  The heating side clamping blade heats the film surface (non-seal surface) that contacts, and the cooling clamping blade cools the film surface (sealant surface) that contacts. Therefore, even if the belt-like film is heated at a high temperature, the film surface that is directly heated is a non-seal surface, and therefore the non-seal surface that the heating clamping blade contacts does not melt and become sticky. Further, such high-temperature heat is transmitted through the belt-like film and also to the opposite sealant surface. However, since the sealant surface is cooled by the cooling-side clamping blade, the sealant surface does not melt and become sticky. Therefore, it becomes easy to deform | transform by heating at high temperature, and even if a pressurizing force is made small, a fold line can be formed and a strip | belt-shaped film is not damaged.

  (2) The cooling sandwiching blade and the heating sandwiching blade may be moved in the same direction as the strip film in synchronization with the movement of the strip film while sandwiching the strip film. If it does in this way, a belt-like film can be heated and pressurized for a certain period, conveying a belt-like film continuously, and it can supply to a packing machine main part at high speed, forming a fold line certainly.

  (3) The cooling clamping blade may be cooled by a water cooling method. Proper cooling can be achieved with a simple configuration.

  (4) The cooling sandwiching blade and the heating sandwiching blade may be arranged at a plurality of locations along the transport direction of the strip film. Since a plurality of lateral folding lines can be formed at the same time, productivity is improved.

  (5) A plurality of sets of the cooling clamping blades and the heating clamping blades are arranged so as to be movable along the transport direction of the belt-like film, and the distance between the adjacent cooling clamping blades and the heating clamping blades It is good to be able to change. It can be applied to a packaging machine for packaging bodies of different dimensions.

  In the present invention, a fold line can be firmly formed in the lateral direction of the belt-like film, and the belt-like film can be smoothly conveyed because it is not sticky even when the heating temperature is increased. Furthermore, since the fold line can be formed even if the pressure is reduced, the band-shaped film is not damaged.

It is a front view which shows a part of strip | belt-shaped film supply apparatus with which the folding line forming apparatus for packaging films of 1st Embodiment was integrated. It is a figure which shows a cooling side folding member and a heating side folding member. (A) is a figure which shows the strip | belt-shaped film in which the fold line was formed, (b) is a figure which shows a package. It is a top view which shows 2nd Embodiment of the folding line formation apparatus for packaging films. It is the front view. It is the side view. It is the side view. It is a figure which shows an example of the shape of the cooling side clamping blade provided in the front-end | tip of both cooling side folding member, and the heating side clamping blade provided in the front-end | tip of both heating side folding member. It is a figure which shows an example of the shape of the cooling side clamping blade provided in the front-end | tip of both cooling side folding member, and the heating side clamping blade provided in the front-end | tip of both heating side folding member. (A) is an enlarged view which shows the front-end | tip part of the cooling side clamping blade 36 and the heating side clamping blade 37 in FIG. 2, (b) is an enlarged view which shows the front-end | tip part of the clamping blade of a conventional structure.

  FIG. 1 shows a part of an example of a film supply apparatus 10 in which a first embodiment of a folding line forming apparatus for packaging film according to the present invention is mounted. This film supply apparatus 10 is an apparatus that conveys the belt-like film 1 continuously drawn out from an original fabric roll installed on the upstream side, and supplies it to the next-stage pillow packaging machine body.

  The belt-like film 1 has a sealant surface (sealant layer) in which one surface (inner peripheral surface in the package) is melted by heating and the contact portions of the same surface are heat-sealed, and the other surface (in the package 34). The outer surface is a non-sealed surface (base film) that does not melt when heated.

  The film supply apparatus 10 includes a plurality of paths that define the paths for transporting the belt-like film 1 continuously drawn out from the raw roll through a predetermined transport path and leading it to a carry-in site (bag making machine) of the pillow packaging machine body. A free roller 11, first and second feed rollers 12, 13, a dancer roller 14, and an alignment roller 15 are provided. The strip-shaped film 1 is conveyed over these rollers.

  Furthermore, the film supply apparatus 10 includes a longitudinal film fold line forming apparatus 20 and a lateral film fold line forming apparatus 30 along the traveling direction of the belt-like film. The longitudinal film fold line forming device 20 is a device that forms a fold line in parallel (longitudinal direction) along the traveling direction of the belt-like film 1. Further, the longitudinal film fold line forming device 20 is arranged at three locations along the traveling direction of the belt-like film 1.

  Specifically, the longitudinal film fold line forming device 20 includes a large-diameter disk-shaped first brazing roller 21 disposed opposite to the belt-shaped film 1 and two small-diameter circular second brazing rollers. 22 is provided. The first brazing roller 21 and the second brazing roller 22 are respectively attached to a machine frame 23 that also serves as a bearing, and the respective brazing rollers 21 and 22 rotate. Further, two sets of the first and second brazing rollers 21 and 22 are provided at a predetermined distance in the width direction of the belt-like film 1.

  A fold line is formed in the contacted part by pressurizing the belt-like film while heating with the first and second brazing rollers 21 and 2 as a pair. Therefore, two parallel fold lines are formed by passing through one longitudinal film fold line forming apparatus 20. Further, the two vertical film fold line forming devices 20 in order from the upstream side form four mountain fold lines 1b at predetermined positions along the film traveling direction, and the third vertical film fold line forming device 20 is formed. Forms two valley fold lines 1c (see FIG. 3A).

  The belt-like film 1 with the mountain crease 1b and the valley fold line 1c attached at predetermined positions is guided to a bag making machine of the packaging machine body, and is passed through the bag to form a tubular film. At this time, the four mountain fold lines 1b are led to the four corners of the bag making machine to form a beautiful square tube shape. That is, as shown in FIG.3 (b), it will be in the state where the four corners of the package 2 were sharply sharpened. Further, the valley fold line 1c is folded inward by a gusset forming device provided in the end seal device of the packaging machine body, so that the gusset is clearly formed on the side surface of the packaging body 2. The specific configuration of the longitudinal film fold line forming apparatus 20 can be realized by using a conventionally known device disclosed in, for example, Patent Document 1.

  The first feed roller 12 is disposed on the downstream side of the three longitudinal film fold line forming devices 20 and rotates by receiving a driving force from a driving motor (not shown). The rotational force of the first feeder 12 is transmitted to the strip film 1, and the strip film 1 is drawn out continuously.

  A second feeder 13 is arranged below the first feeder 12. The second feed roller 13 is also rotated by receiving a driving force from a driving motor (not shown in FIG. 1) (not the driving motor of the first feed roller 12), and is applied to the belt-like film 1 stretched around the second feed roller 13. To give conveyance power. The transverse film fold line forming device 30 is disposed between the feed rollers 12 and 13. Both drive motors rotate synchronously so that the belt-like film 1 passing through the transverse film fold line forming device 30 is conveyed in a tensioned state.

  The dancer roller 14 is disposed between the first feeder 12 and the lateral film fold line forming device 30. The dancer roller 14 is linked to the air cylinder, and is urged to the right side in the figure with respect to the belt-like film 1 stretched by the pressure of the air cylinder. A predetermined tension is applied to the belt-like film 1 by this urging force, and the belt-like film 1 between the feed rollers 12 and 13 can be maintained in a tight state.

  Further, in the present embodiment, the pressure of the air cylinder is adjusted in accordance with the operation of the lateral film fold line forming device 30. That is, as will be described later, when the fold line is formed in the lateral direction with respect to the strip film 1 by the lateral film fold line forming device 30, the pressure is set to a low pressure when the strip film 1 is sandwiched, and the high pressure is controlled in a normal state. Thereby, the belt-like film 1 is folded at the time of fold line formation, and the film portion of the belt-like film 1 located in the lateral film fold line forming device 30 is drawn toward the lateral film fold line forming device 30 side from the first feeder 12. In addition, by making the cylinder pressure low, it is possible to draw the belt-like film 1 and to prevent the belt-like film 1 from being applied with a larger tension than necessary. Thereby, without changing the full length of the strip | belt-shaped film 1 between both the feed rollers 12 and 13, and a tension | tensile_strength are fixed, the state tensioned with the desired tension can be maintained.

  The lateral film fold line forming device 30 is provided in the middle of the conveyance path along which the strip film 1 moves downward in the vertical direction. The lateral film fold line forming device 30 includes a cooling side fold member 31 and a heating side fold member 32 that are disposed to face each other with the belt-like film 1 interposed therebetween. As described above, the belt-like film 1 used in this embodiment has a sealant surface (sealant layer) that melts by heating and a non-seal surface (base film) that does not melt even when heated. Therefore, the cooling side folding member 31 is arranged so as to face the sealant surface, and the heating side folding member 32 is arranged so as to face the non-sealing surface.

  As shown in FIG. 2 in an enlarged manner, the cooling side folding member 31 and the heating side folding member 32 of this embodiment both have a rectangular main body, and are respectively cooled at the upper and lower ends of the opposing surfaces of the main body. The side clamping blade 36 and the heating side clamping blade 37 are integrally formed to project. The cooling side sandwiching blade 36 and the heating side sandwiching blade 37 are close to each other and the leading ends thereof coincide with each other. By sandwiching the strip film 1 from the left and right sides, the cooling side sandwiching blade 36 and the heating side sandwiching blade 37 are brazed and folded along the leading end shape. Form a line. In this embodiment, the cooling-side clamping blade 36 has three peaks (two valleys) up and down, the heating-side clamping blade 37 has two peaks (one valley) up and down, and the peaks and valleys coincide with each other. It has a shape that fits together. Each peak / valley is formed so as to extend in a direction orthogonal to the traveling direction of the belt-like film 1. Further, the width of the cooling side folding member 31 and the heating side folding member 32 (the width of the surface facing the strip film 1: the direction orthogonal to the traveling direction of the strip film 1) is the width of the strip film 1 (the strip film). The length of the belt-like film 1 is longer than the length of 1 in the direction perpendicular to the traveling direction, so that a fold line can be formed over the entire length of the belt-like film 1.

  The specific configuration of the cooling side clamping blade 36 having three peaks (two valleys) above and below and the heating side clamping blade 37 having two peaks (one valley) above and below is enlarged in FIG. As shown. That is, the cooling-side clamping blade 36 includes a first convex portion 36a formed of a central peak, and second convex portions disposed on both sides of the first convex portion 36a (front and rear along the traveling direction of the belt-like film 1). 36b. The height of the 1st convex part 36a is made higher than the height of the 2nd convex part 36b. A first concave portion 36c is formed between the first convex portion 36a and the second convex portion 36b. The heating-side clamping blade 37 includes a concave portion 37a at a position facing the first convex portion 36a, and two convex portions 37b on both sides of the concave portion 37a (front and rear along the traveling direction of the belt-like film 1). The convex portion 37 b faces the first concave portion 36 c of the cooling side clamping blade 36.

  By configuring the cooling-side clamping blade 36 and the heating-side clamping blade 37 as described above, when the belt-like film 1 is sandwiched, it is possible to firmly crease the film by the action described below. That is, when both the sandwiching blades 36 and 37 move closer, the first convex portion 36 a of the cooling sandwiching blade 36 comes into contact with one surface of the belt-like film 1 and is biased toward the heating side sandwiching blade 37. Thereby, the film part of the said strip | belt-shaped film 1 which contacted the 1st convex part 36a is pushed into the recessed part 37b of the heating side clamping blade 37, and is pinched | interposed between the 1st convex part 36a and the recessed part 37b, and a fold line is formed. Try to be. That is, the belt-like film 1 is in a flat state extending straight downward before contacting the first convex portion 36a, but is in contact with the tip of the first convex portion 36a and the concave portion of the heating side clamping blade 37. By being pushed into 37b, the band-like film 1 tends to be drawn in the direction indicated by the solid arrow in FIG. 10 (a). At this time, the convex part 37b of the heating side clamping blade 37 contacts the other surface of the belt-like film 1 and urges toward the cooling side clamping blade 36 (first concave part 36c), and the tip of the convex part 37b contacts. The film portions in the vicinity of both the front and rear sides in the film traveling direction of the film portion are likely to be drawn in the direction indicated by the dashed arrows in FIG. Moreover, the first convex portion 36a and the second convex portion 36b are provided on one side facing the cooling side sandwiching blade 36 on both front and rear sides in the film traveling direction of the film portion where the convex portion 37b of the heating side sandwiching blade 37 contacts. Are in contact with each other, and the film portion from the first convex portion 36a to the second convex portion 36b is urged by the convex portion 37b to be in a tensioned state.

  Therefore, since the drawing direction of the film by the first convex portion 36a (solid arrow direction in the drawing) and the drawing direction of the film by the convex portion 37a (broken arrow direction in the drawing) are reversed, the first convex portion 36a The film can be prevented from being pulled in, and a fold line can be firmly formed by the first convex portion 36a. That is, the film being drawn in the direction of the broken line arrow in the figure by the convex portion 37b functions as a film restraint when the first film 36a urges the belt-like film 1.

  Further, as described above, the fold line is formed on the belt-like film 1 by sandwiching the first convex portion 36a and the concave portion 37a. And the 2nd convex part 36b comprises a part of film suppression function which suppresses that a strip | belt-shaped film is drawn in in the 1st convex part 36a. Therefore, by making the height of the first convex portion 36a higher than the height of the second convex portion 36b, it is possible to make a fold line firmly, and more than necessary, the band-shaped film 1 face is formed by the second convex portion 36b. Is suppressed.

  On the other hand, for example, as shown in FIG. 10 (b), assuming that one of the sandwiching blades A has a conventional shape generally provided with one convex portion, the band-shaped film 1 is sandwiched between the pair of sandwiching blades A and B. The belt-like film 1 comes into contact with the tip of the convex portion of the sandwiching blade A and is pushed into the concave portion of the other sandwiching blade B, so that the strip-like film 1 is drawn in the direction indicated by the solid line arrow in FIG. It will be. And since there is no film restraining function as in this embodiment, the belt-shaped film will escape when the film is drawn in the direction of the solid line arrow, and the folding line can be firmly attached compared to this embodiment. Disappear.

  The cooling side folding member 31 has holes 31a extending in the lateral direction (direction perpendicular to the traveling direction of the belt-like film 1) at positions near the opposing surfaces of the upper and lower ends of the main body. A pipe 34 through which cold water passes is inserted and installed in the hole 31a. And cold water (for example, 17 degreeC) is made to flow in this piping 34. FIG. The cold water flowing in the pipe 34 cools the main body of the metal cooling side folding member 31 and the cooling side clamping blade 36. The pipe 34 may use the hole formed in the cooling side folding member 31 as it is. And the both ends of this piping 34 are connected with the edge part of the tube used as the channel | path of the said cold water for circulating cold water, and this tube is cooled by the cooling device installed in the back surface side of the film supply apparatus 10, for example Then, the cooled cold water is always circulated in the pipe 34 by the circulation pump.

  On the other hand, the heating side folding member 32 has holes 32a extending in the lateral direction (direction perpendicular to the traveling direction of the belt-like film 1) at positions near the opposing surfaces of the upper and lower ends of the main body. A heater 35 is inserted and installed in the hole 32a. By energizing and heating the heater 35, the main body of the metal heating side folding member 32 and the heating side holding blade 37 are heated. The heating temperature at this time is set to a higher temperature (for example, 130 ° C.) than the conventional folding line forming apparatus.

  Even when the belt-like film 1 is heated at such a high temperature, the heating side folding member 32 (heating-side clamping blade 37) is in direct contact with the non-sealing surface (base film) of the belt-like film 1. The heated film surface melts and is not sticky. Further, such high temperature heat is transmitted through the belt-like film 1 and also to the opposite sealant layer, but since the sealant layer is cooled by the cooling side folding member 31 (cooling side clamping blade 36), the sealant The layers do not melt and become sticky.

  The cooling side folding member 31 and the heating side folding member 32 approach / separate and move up and down while maintaining the state in which the opposing surfaces thereof face each other. That is, the cooling side folding member 31 and the heating side folding member 32 rotate and move in synchronization with a locus indicated by a two-dot chain line in FIG. Specifically, the cooling side clamping blade 36 and the heating side clamping blade 37 come into contact with each other at the upper position, and move downward while remaining in contact with each other, and then move upward while separating. Such an operation is performed by a drive mechanism 33 such as a cam mechanism, and can be realized by the same type of drive mechanism in a so-called box motion type end seal device mounted on the packaging machine body.

  And the strip | belt-shaped film 1 because the cooling-side clamping blade 36 and the heating-side clamping blade 37 approach and agree in the state where the strip-shaped film 1 is interposed between the cooling-side folding member 31 and the heating-side folding member 32. Is pressed at a desired pressure by both sandwiching blades 36 and 37. In this state, the sandwiching blades 36 and 37 move downward, so that the pressed state of the belt-like film 1 continues for a certain time. And the applied pressure at the time of this clamping is set to a pressure smaller than that of the conventional folding line forming apparatus. Here, the small pressure is such that the band-shaped film is not damaged when sandwiched and pressurized.

  In this embodiment, even if the belt-like film 1 is heated and softened at a high temperature to be easily deformed, the sealant layer does not melt and become sticky on the cooling side sandwiching blade 36, and the belt-like film can be conveyed stably. And since the state which pinched | interposed and pressed the strip | belt-shaped film 1 with both the clamping blades 36 and 37 can be ensured for a fixed time, even if it is small pressure, a crease | fold is carried out to the strip | belt-shaped film 1 along the outer shape of both the clamping blades 36 and 37 reliably. A fold line can be formed in the lateral direction. That is, as described with reference to FIG. 10, in the present embodiment, the cooling side sandwiching blade 36 having three peaks (two valleys) above and below, and the heating side having two peaks (one valley) above and below. By using the sandwiching blade 37, in addition to the effect that the crease can be firmly attached due to the characteristics of the mechanical structure and shape, the belt-like film 1 is heated and softened to be in a state of being easily deformed. A fold line can be formed.

  Further, in the present embodiment, the cooling side clamping blades 36 provided above and below the cooling side folding member 31 and the heating side clamping blades 37 provided above and below the heating side folding member 32 are used to change the traveling direction of the belt-like film 1. Two folding lines 1a and 1a 'extending in the orthogonal direction are formed simultaneously at a predetermined interval in the front-rear direction (see FIG. 3A). The two folding lines 1a and 1a ′ are formed by a lower cooling side clamping blade 36 and a heating side clamping blade 37, and the upper cooling side clamping blade 36 and the heating side clamping blade 37 are connected to each other. As a result, a fold line 1a is formed. Then, the film portion between the two folding lines 1a and 1a 'formed at the same time is end-sealed (end seal portions 2a and 2a') in the subsequent packaging machine body. That is, the folding line 1a of one package and the folding line 1a 'of another package are formed simultaneously.

  In this embodiment, the cooling side sandwiching blade 36 is provided with three peaks (first convex portion 36a and the second convex portion 36b), and the heating side sandwiching blade 37 is provided with two peaks (convex portion 37b). Depending on the protruding direction of the fold line with respect to the film (mountain fold / valley fold), the arrangement may be reversed (the cooling side clamping blade 36 has two peaks and the heating side clamping blade 37 has three peaks).

  In addition, in the present invention, the non-sealed surface is heated while cooling the sealant surface with respect to the belt-shaped film belt-like film that is a sealant surface that can be heat-sealed only on one side. Although the sandwiching blade 36 is provided, the film is sandwiched between the sandwiching blade having the three ridges and the sandwiching blade having the two ridges, although this is not an embodiment of the present invention. You may make it attach a line and a crease. In particular, it functions effectively in the case where the film does not require heating due to the material of the film. Moreover, you may heat both clamping blades with the material etc. of a film.

  4 to 7 show a second embodiment. In the first embodiment described above, the cooling side folding member 31 is integrally provided with the two cooling side clamping blades 36, and the heating side folding member 32 is integrally provided with the two heating side clamping blades 37. The distance between the two folding lines 1a and 1a 'was fixed. On the other hand, the transverse film fold line forming apparatus 30 'of the present embodiment can change the interval between the two fold lines 1a and 1a'.

  Specifically, the first cooling side folding member 41 and the second cooling side folding member 42 are separately arranged vertically so as to be movable up and down, and the cooling side clamping blade 47 is provided at the tip of each cooling side folding member 41, 42. Are integrally formed. Similarly, the first heating side folding member 43 and the second heating side folding member 44 are separated from each other in the vertical direction, and the heating side holding blade 48 is integrally formed at the tip of each heating side folding member 43, 44.

  The second cooling side folding member 42 is attached to the base 51. And the 1st cooling side folding member 41 is attached to the movable stand 52 attached with respect to the base 51 so that raising / lowering movement was possible. Therefore, by raising and lowering the movable table 52 with respect to the base 51, the first cooling side folding member 41 is raised or lowered relative to the second cooling side folding member 42, thereby cooling both sides. The distance between the folding member 41, 42 can be changed. Further, the moving table 52 is linked to a long hole 51b formed along the pillar portion 51a projecting upward at both ends of the upper surface of the base 51 at both ends thereof, and can move up and down along the long hole 51b. Then, by fastening the fixing screw 56, the moving base 52 and, in turn, the first cooling side folding member 41 are fixed at a desired height position.

  The first cooling side folding member 41 can move in a horizontal direction with respect to the moving base 52 and the second cooling side folding member 42 with respect to the base 51 in a horizontal direction. That is, one end of the slide guide shaft 55 is connected to each of the first cooling side folding member 41 and the second cooling side folding member 42. The slide guide shaft 55 is disposed so as to penetrate the respective cooling side folding members 41 and 42 in the horizontal direction and is movable in the axial direction. Therefore, both the cooling side folding members 41 and 42 are guided by the slide guide shaft 55 and move in the horizontal direction, that is, move toward and away from both the heating side folding members 43 and 44 (band-like film 1). Further, the cooling side folding members 41 and 42 are in contact with the tips of the coil springs 54 accommodated in the movable table 52 and the base 51, and the heating side folding members 43 and 42 are brought into contact by the elastic restoring force of the coil springs 54. It is urged toward 44 (band-like film 1). Further, the elastic restoring force of the coil spring 54 is adjusted by tightening or loosening the pressure adjusting screw 53 so that the pressure when the band-shaped film 1 is sandwiched can be changed. Such a horizontally moving mechanism can be configured similarly in the first embodiment.

  Further, cam floors 49 are attached to the outer sides of both ends of the base 51, and cam grooves (not shown) of cams (not shown) on the outer sides of the cam floors 49 are disposed on the outer sides of the cam floors 49. ) To become a cam mechanism. Then, by rotating the cam mechanism with a known drive mechanism, the base 51 (second cooling side folding member 42) and the movable table 52 (first cooling side folding member 41) linked thereto are set in a predetermined manner. Revolve around the trajectory.

  Similarly, on the heating side, the second heating side folding member 44 is attached to the base 61 using a fixing screw 63. And the 1st heating side folding member 43 is attached to the moving stand 62 attached so that the raising / lowering movement was possible with respect to the base 61 using the fixing screw 63. FIG. Therefore, by raising and lowering the moving table 62 with respect to the base 61, the first heating side folding member 51 is moved up and down relative to the second heating side folding member 52, and both heating sides are moved. The distance between the folding members 43 and 44 can be changed.

  Further, cooling side clamping blades 47 are integrally formed at the tips of the first cooling side folding member 41 and the second cooling side folding member 42 respectively. Moreover, the heating side clamping blade 48 is integrally formed at the tips of the first heating side folding member 43 and the second heating side folding member 44 respectively. The cooling side sandwiching blade 47 and the heating side sandwiching blade 48 are aligned at their tips, and are creased along the tip shape to form a fold line. In the present embodiment, as shown in an enlarged view in FIG. 8A, the cooling side clamping blade 47 has three peaks (two valleys) up and down, and the heating side clamping blade 48 has two peaks (1 Two valleys), and each mountain and valley coincide with each other. Each peak / valley is formed so as to extend in a direction orthogonal to the traveling direction of the belt-like film 1. Further, the width of the cooling side folding member 31 and the heating side folding member 32 (the width of the surface facing the strip film 1: the direction orthogonal to the traveling direction of the strip film 1) is the width of the strip film 1 (the strip film). The length of the belt-like film 1 is longer than the length of 1 in the direction perpendicular to the traveling direction, so that a fold line can be formed over the entire length of the belt-like film 1.

  Further, holes 41a and 42a extending in the lateral direction (a direction orthogonal to the traveling direction of the belt-like film 1) are provided in the vicinity of the tips of the cooling side folding members 41 and 42, and cold water is passed through the holes 41a and 42a. A pipe 45 is inserted and installed. And cold water (for example, 17 degreeC) is made to flow in this piping 45. FIG.

  Also, hole portions 43a and 44a extending in the lateral direction (direction orthogonal to the traveling direction of the belt-like film 1) are provided in the vicinity of the tips of the heating side folding members 43 and 44, and the heater 46 is provided in the hole portions 43a and 44a. Inserted and installed. By energizing and heating the heater 46, both the metal heating side folding members 43 and 44, and by extension, the heating side clamping blade 48 are heated. Since other configurations and operational effects are the same as those of the first embodiment described above, detailed description thereof is omitted.

The cooling side clamping blade provided at the tip of the first cooling side folding member 41 and the second cooling side folding member 42, or the heating side provided at the tip of the first heating side folding member 43 and the second heating side folding member 44 shape clamping blade can take each seed forms. Reference examples include those shown in FIGS. 8B and 8C and FIG. That is, as shown in FIG. 8B, the cooling-side sandwiching blade 61 is a single ridge, and the heating-side sandwiching blade 62 is a concave groove corresponding thereto. As shown in FIG. 8 (c), both the cooling side clamping blade 63 and the heating side clamping blade 64 are formed as projecting protrusions and have a target shape, and the front end and the side surface subsequent thereto are brought into contact with the other side and folded with creases. Form a line.

  As shown in FIG. 9A, the cooling-side clamping blade 65 may be a protrusion having a narrow and sharp tip, and the heating-side clamping blade 66 may be a concave groove wider than the vertical thickness of the cooling-side clamping blade 65. . As shown in FIG. 9B, both the cooling side clamping blade 67 and the heating side clamping blade 68 may be protrusions having a narrow and sharp tip. Further, as shown in FIG. 9 (c), the cooling side clamping blade 69 may have a single ridge projection, and the heating side clamping blade 70 may have a shape in which a concave groove is formed at the tip of the projection.

DESCRIPTION OF SYMBOLS 1 Strip | belt-shaped film 10 Film supply apparatus 30,30 'Transverse film fold line formation apparatus 31 Cooling side folding member 32 Heating side folding member 34 Pipe 35 Heater 36 Cooling side clamping blade 37 Heating side clamping blade 41 1st cooling side folding Fence member 42 Second cooling side folding member 43 First heating side folding member 44 Second heating side folding member 45 Pipe 46 Heater 47 Cooling side clamping blade 48 Heating side clamping blade

Claims (5)

A fold line forming device for a wrapping film that is provided in the middle of transporting a strip film in a packaging machine and forms a fold line in a direction that intersects the traveling direction of the strip film,
The middle of the conveyance is between a first feed roller and a second feed roller that impart a conveyance force to the strip film,
The first sandwiching blade and the second sandwiching blade are disposed so as to be able to approach and separate while maintaining the state in which the opposing surfaces thereof face each other across the belt-like film,
On the opposing surface of the first sandwiching blade, a first convex portion extending in a direction intersecting with the traveling direction of the strip-shaped film, and a first convex portion disposed in front and rear of the traveling direction of the strip-shaped film. Two convex portions are provided, and a first concave portion is formed between the first convex portion and the second convex portion,
On the facing surface of the second sandwiching blade, a concave portion is provided at a portion facing the first convex portion, and a convex portion is provided at a portion facing the first concave portion,
The strip film is sandwiched between the first convex portion of the first sandwiching blade and the concave portion of the second sandwiching blade and pressed to form the fold line.
In a state where the belt-like film is sandwiched between the first clamping blade and the second clamping blade, there is a gap between the first concave portion and the convex portion, and the tips of the second convex portion and the convex portion are mutually connected. The fold line is formed in a state in which the belt-like film located between the second convex portions arranged in the front and the rear is in a stretched state .
When the pressure of the air cylinder that applies tension to the belt-like film moving between the first feed roller and the second feed roller is made lower than the normal pressure, the first sandwiching blade and the second sandwiching blade A folding line forming apparatus for a packaging film, characterized in that the belt-like film is sandwiched .   The fold line forming apparatus for packaging film according to claim 1, wherein the height of the first convex portion is higher than the height of the second convex portion.   2. The first sandwiching blade and the second sandwiching blade are configured to move in the same direction as the strip film in synchronization with the movement of the strip film in a state where the strip film is sandwiched. Or the folding line forming apparatus for packaging films of 2.   4. The fold line forming apparatus for a packaging film according to claim 1, wherein the first sandwiching blade and the second sandwiching blade are disposed at a plurality of locations along a transport direction of the strip-shaped film. .   The plurality of sets of the first clamping blades and the second clamping blades are arranged so as to be movable along the transport direction of the strip film, and the distance between the adjacent first clamping blades and the second clamping blades can be changed. The fold line forming apparatus for a packaging film according to claim 4, which is configured as described above.

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