JP2016002666A - Manufacturing method for packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently form an easy-to-peal seal part, which is relatively low in peeling strength, on one or more longitudinal portions of dividing seal parts dividing the inside of a packaging bag.SOLUTION: A manufacturing method for a packaging bag includes a heat seal step in which a predetermined parts of two belt-like film materials 30, placed one above the other, in a width direction orthogonal to the longitudinal direction of the materials 30 are heat-sealed by a pair of heat rollers. At least one heat roller of the pair of heat rollers is a heat roller 60 of irregular shape in which an area 61, where the distance between the rotation shaft 64 and the outer periphery 63 is relatively long, and an area 62, where they are short, are provided in different areas in a circumferential direction. The long areas 61 sandwiches the film material 30 with pressure relatively high and thereby a sealed part whose peeling strength is relatively high is formed. The short area sandwiches the film material 30 with pressure relatively low and thereby an easy-to-peal part whose peeling strength is relatively low is formed. Accordingly, this method solves the problem.

Description

  The present invention relates to a method for manufacturing a packaging bag, and more particularly, to a method for manufacturing a packaging bag provided with a part or a plurality of parts that are easily peeled off in a seal part for dividing the interior of the packaging bag into a plurality of rooms. .

  There is a packaging bag configured such that the interior of the packaging bag is divided into a plurality of rooms, and each room can accommodate different fluids. A packaging bag having a plurality of chambers inside has a seal portion (hereinafter referred to as “a seal portion) in which a front surface portion and a back surface portion are sealed in a band shape inside the periphery of the packaging bag, in addition to a seal portion that closes the periphery of the packaging bag. It is called “divided seal part”. The inside of the packaging bag is divided into a plurality of rooms by a divided seal portion.

  In such a packaging bag, when pressure is applied to the packaging bag, the fluid contained in each room is mixed by separating the front side and the back side at the position of the split seal part. There is a structured packaging bag. The strength at which the front side and the rear side of the packaging bag are peeled off (hereinafter referred to as “peel strength”) is the seal portion where the peel strength at the position of the split seal portion is closed around the packaging bag. It is comprised so that it may become lower than the peeling strength in the position. Therefore, when a pressure is applied to the packaging bag, only the divided seal part peels off.

  Packaging bags constructed so that the peel strength at the position of the split seal portion is lower than the peel strength at the position of the seal portion closing the periphery of the packaging bag must be manufactured by various methods so far. Has been proposed. The packaging bag proposed in Patent Document 1 is formed such that the seal width of the divided seal portion is narrower than the seal width of the end seal portion that closes the upper and lower ends of the packaging bag. In this packaging bag, the peel strength at which the front side and the back side are peeled off at the position of the split seal portion with a narrow seal width is greater than the peel strength at which the end seal portion is peeled off from the front side and the back side of the packaging bag. Is also low. Therefore, when the internal pressure of the packaging bag rises, only the divided seal part is supposed to peel off.

  The manufacturing method of the packaging bag proposed in Patent Document 2 manufactures the packaging bag by setting the seal temperature of the weak seal portion lower than the seal temperature of the strong seal portion closing the periphery of the packaging bag. . In the packaging bag manufactured by this packaging bag manufacturing method, the seal strength of the weak seal portion is lower than the seal strength of the strong seal portion. Therefore, when pressure is applied to the packaging bag, only the weak seal portion peels off.

JP 2004-331184 A JP 2006-52013 A

  However, the packaging bag proposed in Patent Document 1 has a relatively low peel strength over the entire length in the longitudinal direction in which the split seal portion extends. Therefore, when an unexpected pressure is applied to the packaging bag, there is a risk that the split seal portion peels over the entire length. In particular, when a plurality of packaging bags are stacked and transported, there is a high possibility that the split seal peels off due to an unexpected external force applied to the packaging bags.

  Similarly, in the packaging bag proposed in Patent Document 2, there is a risk that the weak seal portion is peeled off during transportation or the like over the entire length of the weak seal portion. Moreover, since the manufacturing method of the packaging bag proposed by patent document 2 has sealed the weak seal part at low temperature, management of the temperature to seal becomes complicated.

  The structure in which the seal portion having a relatively low strength at which the front surface portion and the back surface portion are peeled off is partially provided in the split seal portion is the risk that the front surface portion and the back surface portion are peeled off in the entire split seal portion. It can be reduced that the back surface part is partially peeled off.

  As described above, Patent Document 1 configures a low peel strength by widening the seal width of the end seal portion to form a high peel strength and narrowing the seal width of the divided seal portion. Referring to this idea, providing the seal part with a relatively low strength at which the front part and the back part are peeled off by providing a part with a narrow seal width in the part seal part. Can be considered. On the other hand, Patent Document 2 forms the weak seal portion by setting the seal temperature lower than the seal temperature of the strong seal portion closing the periphery of the packaging bag. Referring to this concept, a split seal part is formed by dividing a part sealed at a high seal temperature and a part sealed at a low seal temperature into a split seal part. It is conceivable to provide a part.

  However, a method of forming a portion with a high peel strength and a portion with a low peel strength by forming a portion with a wide seal width and a portion with a narrow seal width is, for example, sealing a portion with a wide seal width and a portion with a narrow seal width with different seal bars It becomes necessary to do. This complicates the process of forming the split seal portion. On the other hand, the method of forming the strength of the peel strength by forming the portion sealed at a high temperature and the seal portion at a low temperature requires sealing at different temperatures. This complicates temperature management.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to provide an easily peelable seal portion having a relatively low peel strength on a seal portion for dividing the inside of a packaging bag into a plurality of rooms. Another object of the present invention is to provide a method for manufacturing a packaging bag capable of efficiently forming a packaging bag formed in a part or a plurality of parts in the longitudinal direction of the divided seal portion.

  The manufacturing method of the packaging bag according to the present invention for solving the above-described problem is a seal in which the peel strength at which the sealed front and back portions are peeled seals the front and back portions around the packaging bag. A method for manufacturing a packaging bag in which the interior of the packaging bag is divided into a plurality of rooms by sealing the front and back portions of the packaging bag with a split seal portion having an easily peelable seal portion lower than the portion, The overlapped belt-like film material is continuously fed in the longitudinal direction, and heat-sealed continuously in the longitudinal direction of the film material with a pair of rollers at a predetermined position in the width direction orthogonal to the longitudinal direction of the film material. A region in which the distance between the rotation shaft and the outer peripheral surface is relatively long, and a region in which the distance between the rotation shaft and the outer peripheral surface is relatively short. And the roller It is a deformed heat roller provided in different regions in the circumferential direction, and the long region sandwiches the film material with a relatively high pressure to form a strong seal portion having a relatively high peel strength, The short region sandwiches the film material with a relatively low pressure, thereby forming an easily peelable seal portion having a relatively low peel strength.

  According to the present invention, since the heat seal process forms the split seal portion on the film material as described above using the deformed heat roller, the strong seal portion having a relatively high peel strength and the peel strength being relatively low easily. The split seal portions can be formed so that the peel seal portions alternately appear in the longitudinal direction of the split seal portions. Therefore, the easily peelable seal part can be efficiently formed on a part or a plurality of parts of the split seal part. As a result, when unexpected pressure is applied to the completed packaging bag, the risk that the split seal portion peels can be limited to the portion where the easy peel seal portion is formed in the entire length of the split seal portion. .

  In the manufacturing method of the packaging bag which concerns on this invention, the outer peripheral surface of the said short area | region can be comprised so that it may have a corrugated sealing surface meandering in the direction orthogonal to the longitudinal direction of the said film material.

  According to this invention, the corrugated easily peelable seal portion can be formed on the packaging bag. Since the stress is concentrated on the corrugated peak portion or the trough portion, the corrugated easy peel seal portion can be peeled more easily than the straight easy peel seal portion.

  In the method for manufacturing a packaging bag according to the present invention, the number of the short regions provided in the deformed heat roller corresponds to the number of the easily peelable seal portions formed in one packaging bag to be completed, In the heat sealing step, while the film material is sent in the longitudinal direction of the film material by a distance corresponding to a height connecting the upper edge and the lower end of one packaging bag or a width connecting both side edges, The deformed heat roller can be configured to rotate once.

  According to the present invention, since the number of easily peelable seal portions formed in one packaging bag and the number of the short regions described above on the outer peripheral surface of the deformed heat roller coincide with each other, the deformed heat roller is rotated once. A desired number of easily peelable seal portions can be formed in one packaging bag simply by making them. Since a desired number of easily peelable seals can be formed in a single packaging bag by rotating the deformed heat roller only once, it is easy to control the rotational speed of the deformed heat roller and the speed at which the film material is fed. Can do.

  In the method for manufacturing a packaging bag according to the present invention, the distance between the rotating shaft of the deformed heat roller and the outer peripheral surface and the number of rotations of the deformed heat roller are formed on the one packaging bag. It can comprise so that it may be set according to the number of seal parts.

  According to the present invention, a desired number of easily peelable seal portions are provided on one packaging bag by changing the distance between the rotation shaft and the outer peripheral surface of the deformed heat roller and the rotational speed of the deformed heat roller or the deformed heat roller. Can be formed.

  According to the method for manufacturing a packaging bag according to the present invention, an easily peelable seal portion having a relatively low peel strength is provided in the longitudinal direction of the split seal portion in the split seal portion that divides the interior of the packaging bag into a plurality of rooms. The packaging bag formed automatically can be formed efficiently.

It is a perspective view of one embodiment of the packaging bag manufactured by the manufacturing method of the packaging bag concerning the present invention. It is explanatory drawing for demonstrating the process of forming a division | segmentation seal | sticker part. It is explanatory drawing for demonstrating the process of forming a division | segmentation seal | sticker part with a heat roller. It is a top view which shows the outer peripheral surface of one Embodiment of a heat roller. It is explanatory drawing for demonstrating the process of forming a division | segmentation seal | sticker part with a pair of heat roller whose one heat roller is a deformed heat roller and the shape of the cross section of the other heat roller is circular. It is the top view which looked at the heat roller of another shape in the cross section in the axial direction of the heat roller. It is the top view which looked at the heat roller of another shape in the cross section in the axial direction of the heat roller. It is explanatory drawing for demonstrating the process of forming a division | segmentation seal | sticker part with the heat roller from which the distance of a rotating shaft and an outer peripheral surface and rotation speed mutually differ. It is explanatory drawing for demonstrating the process of forming a division | segmentation seal | sticker part with the unusual shape heat roller in which a rotating shaft is located in the radial direction outer side from the center of a heat roller. It is explanatory drawing for demonstrating the effect | action of the completed packaging bag.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The technical scope of the present invention is not limited only to the following description and drawings.

[Basic configuration]
As shown in FIG. 1 to FIG. 3, the method for manufacturing a packaging container according to the present invention has a peel strength at which the sealed front surface portion 2 and the back surface portion 3 are peeled off. The inside of the packaging bag 1 is sealed by sealing the front surface portion 2 and the back surface portion 3 with the split seal portion 15 having the easily peelable seal portions 21, 22 lower than the seal portions 11, 12, 13 sealing the back surface portion 3. Is a method of manufacturing a packaging bag divided into a plurality of rooms 8 and 9.

  As shown in FIG. 2, the packaging bag manufacturing method continuously feeds the overlapped strip-like film material 30 in the longitudinal direction, and at a predetermined position in the width direction orthogonal to the longitudinal direction of the film material 30, It includes a heat sealing process in which the pair of rollers 60 continuously heat seals in the longitudinal direction of the film material 30. As shown in FIG. 3, the at least one heat roller 60 of the pair of heat rollers 60 has a region 61 in which the distance between the rotation shaft 64 and the outer peripheral surface 63 is relatively long, and the distance between the rotation shaft 64 and the outer peripheral surface. A relatively short region 62 is a deformed heat roller provided in a different region in the circumferential direction of the heat roller 60.

  In the present specification, the irregular heat roller means the following three types of heat rollers. In the first type of deformed heat roller, the distance between the rotating shaft and the outer peripheral surface is relatively long (hereinafter, simply referred to as “long region”), and the distance between the rotating shaft and the outer peripheral surface is relative. It is a heat roller in which an outer peripheral surface is configured by combining a short region (hereinafter, simply referred to as a “short region”) in the circumferential direction. A typical example of the deformed heat roller is composed of a fan-shaped portion having a constant radius in a certain circumferential range, and a fan-shaped portion having a radius obtained by adding a certain distance to the radius of the fan-shaped portion. Heat roller. The second type of deformed heat roller is a heat roller having an elliptical cross-sectional shape. The third type of irregularly shaped heat roller is a heat roller having a circular cross-sectional shape, and the rotational axis of the heat roller is located outside the center of the heat roller itself.

  In the heat sealing step, the long region 61 sandwiches the film material 30 with a relatively high pressure, thereby forming a strong seal portion 51 having a relatively high peel strength. On the other hand, the short region 62 sandwiches the film material 30 with a relatively low pressure, thereby forming an easily peelable seal portion 52 having a relatively low peel strength.

  According to the method for manufacturing a packaging bag according to the present invention, the split seal portion 15 that divides the interior of the packaging bag 1 into a plurality of chambers 8 and 9 has easy peel seal portions 21 and 22 having relatively low peel strength. The packaging bag 1 partially formed in the longitudinal direction of the divided seal portion 15 can be efficiently formed.

[Outline of configuration of packaging bag with easy peel seal]
An outline of the configuration of the packaging bag 1 manufactured by the manufacturing method of the packaging bag according to the present invention will be described with reference to FIG.

  The packaging bag 1 is composed of a single film material folded in two. One surface folded in half is configured as a front surface portion 2, and the other surface folded in half is configured as a back surface portion 3. The upper end 4 of the packaging bag 1 is constituted by a folded line 4a of the film material. On the other hand, the lower end 5 of the packaging bag 1 is closed by a heat seal part 13 in which the front part 2 and the back part 3 are heat sealed. Further, both side edges 6 and 7 of the packaging bag are closed by heat seal portions 11 and 12 in which the front surface portion 2 and the back surface portion 3 are heat sealed. The heat seal part 13 that closes the lower end 5 of the packaging bag 1 and the heat seal parts 11 and 12 that close both side edges 6 and 7 have relatively high peel strength at which the front part 2 and the back part 3 are peeled off. It is a high strong seal part.

  The packaging bag 1 further includes a split seal portion 15. The divided seal portion 15 divides the inside of the packaging bag 1 into an upper chamber 8 and a lower chamber 9.

  The split seal portion 15 is formed by heat-sealing the front surface portion 2 and the back surface portion 3 so as to extend in the width direction of the packaging bag 1, and connects both side edges 6 and 7 of the packaging bag 1. . The split seal portion 15 is composed of strong seal portions 16, 17, and 18 having relatively high peel strength and easy peel seal portions 21 and 22 having relatively low peel strength in the longitudinal direction in which the split seal portion 15 extends. It is formed to appear in In the divided seal portion 15, the heat seal portion extending linearly is the strong seal portions 16, 17, 18 having relatively high peel strength, and the corrugated heat seal portion is an easy peel seal having relatively low peel strength. Parts 21 and 22.

  Specifically, the heat seal portion located between the side edges 6 and 7 of the packaging bag 1 and the points P1 and P2 inside the side edges 6 and 7 has a relatively high peel strength. High strong seal portions 16 and 17. The strong seal portions 16 and 17 extend linearly. The heat seal portion between the points P1 and Q1 and the heat seal portion between the points P2 and Q2 disposed on the center side of the packaging bag 1 with respect to the strong seal portions 16 and 17 have relative peel strength. The easily peelable seal portions 21 and 22 are low. The easily peelable seal portions 21 and 22 have a waveform. The heat seal part provided between the point Q1 and the point Q2, which is located between the easy peel seal parts and located at the center part in the width direction of the packaging bag 1, has a relatively high peel strength. It is a seal part 18. The strong seal portion 18 extends linearly.

  In the packaging bag 1 shown in FIG. 1, the easily peelable seal portions 21 and 22 meander in the up and down direction of the packaging bag 1 to form a waveform, and therefore when the pressure is applied to the packaging bag 1, the easily peelable seal portion 21. , 22 are concentrated at the peak or valley positions of the waveform. Therefore, the easily peelable seal portions 21 and 22 formed in a waveform are peeled more easily than the easily peelable seal portion extending linearly.

  In addition, the packaging bag 1 shown in FIG. 1 is manufactured using the film material folded in half. However, a packaging bag can also be manufactured so that a front part and a back part may be comprised with two film materials.

  Moreover, the easy peeling seal | sticker part is not limited to forming in a waveform like the packaging bag 1 shown in FIG. 1, You may form so that it may extend linearly. Moreover, although FIG. 1 has shown the packaging bag 1 provided with the easily peelable seal parts 21 and 22 in two places as an example, it is not limited to providing an easily peelable seal part in two places, 1 It can be provided only at a location, or can be provided at 3 or more locations.

[Manufacturing method of packaging bag with split seal]
The manufacturing method of the packaging bag provided with the division | segmentation seal | sticker part, especially the process of forming a division | segmentation seal | sticker part is demonstrated with reference to FIGS.

  As shown in FIG. 2, the manufacturing method of the packaging bag includes a step of continuously feeding the film material 30 in the longitudinal direction of the film material 30 in a state in which the belt-shaped film material 30 is folded at the center in the width direction and stacked in two. doing. The band-shaped film material 30 is, for example, fed from a film roll (not shown) around which the film material 30 is wound, and is folded at the center in the width direction in the middle process until reaching the state of FIG. Put into a state. In FIG. 2, the band-shaped film material 30 has a fold line 34 at the upper position in FIG. 2, and is an area configured as the front portion 2 of the packaging bag 1 that is folded and completed at the position of the fold line 34. 31 and the area | region 32 comprised as the back surface part 3 of the packaging bag 1 completed are overlaid. Although not particularly shown in the drawings, the film material 30 may be overlapped by overlapping two strip-shaped film materials provided separately.

  The step of continuously feeding the film material 30 includes a step of forming a heat seal portion 41 that closes a portion configured as the side edges 6 and 7 of the packaging bag 1 to be completed. The step of continuously feeding the film material 30 includes a sealing step of forming a heat seal portion 43 that closes a portion configured as the lower end 5 of the packaging bag 1 to be completed. Further, the step of continuously feeding the film material 30 includes a sealing step of forming a split seal portion 45 for dividing the interior of the completed packaging bag 1 into a plurality of rooms 8 and 9.

  As for the film material 30, the edge 35 of the width direction of the film material 30 is corresponded. The heat seal part 43 is formed by heat-sealing the matched edges 35 in the longitudinal direction of the film material 30. The heat seal portion 43 is formed, for example, by being sandwiched by a pair of heat rollers (not shown) from one side and the other side of the film material 30 that are overlapped, and heated to a predetermined temperature. In other words, the heat seal part 43 is formed by sandwiching the film material 30 with a heat roller (not shown) from the front surface side and the back surface side of the paper surface of FIG. 2 and heating the sandwiched film material 30 to a predetermined temperature. . The edge 35 of the heat-sealed film material 30 is configured as, for example, the lower end 5 of the completed packaging bag 1. Moreover, the heat seal part 43 is comprised as the heat seal part 13 which closes the lower end 5 of the completed packaging bag 1. FIG. In addition, you may form the heat seal part 43 with a seal bar instead of a heat roller.

  Further, the film material 30 is sequentially formed with a belt-like heat seal portion 41 extending in a direction orthogonal to the direction in which the film material 30 is sent, with a certain interval in the direction in which the film material 30 is sent. In other words, in the film material 30 in a two-layered state, a band-shaped heat seal portion 41 extending in the width direction of the film material 30 is sequentially formed at a certain interval in the longitudinal direction of the film material 30. For example, the heat seal portion 41 is sandwiched by a seal bar (not shown) from one side and the other side of the film material 30, in other words, from the front side and the back side of the paper surface of FIG. 2, and is heated to a predetermined temperature. Formed by. The heat seal part 41 is comprised as the heat seal parts 11 and 12 of the side edges 6 and 7 of the completed packaging bag 1, for example.

  The film material 30 is further formed with a split seal portion 45. The division seal portion 45 is formed to extend linearly in the direction in which the film material 30 is fed. Moreover, the division | segmentation seal | sticker part 45 is formed in the position set beforehand in the direction (width direction of the film material 30) orthogonal to the direction where the film material 30 is sent. In the example shown in FIG. 2, the split seal portion 45 is displaced toward the fold line 34 side where the film material 30 is folded from the center in the direction orthogonal to the direction in which the film material 30 is sent (the width direction of the film material 30). It is formed in the position.

[When forming a split seal using a first-type deformed heat roller]
The split seal portion 45 is formed by, for example, a pair of odd-shaped heat rollers 60 shown in FIG. The deformed heat rollers 60 are arranged one by one on the one surface side and the other surface side of the stacked film material 30, and the outer peripheral surfaces 63 of the deformed heat rollers 60 are opposed to each other. The two deformed heat rollers 60 heat-seal by sandwiching the film material 30 fed between the opposed outer peripheral surfaces 63 and heating it to a predetermined temperature.

  The pair of irregularly shaped heat rollers 60 is configured by combining a region 61 where the distance between the rotating shaft 64 and the outer peripheral surface 63 is long and a region 62 where the distance between the rotating shaft 64 and the outer peripheral surface 63 is short in the circumferential direction. Yes. The pair of deformed heat rollers 60 shown in FIG. 3 shows one example, and each deformed heat roller 60 includes a fan-shaped portion (short region 62) having a constant radius in a certain range in the circumferential direction. The fan-shaped portions (long regions 61) having a radius obtained by adding a certain distance to the radius of the fan-shaped portion are alternately arranged in the circumferential direction.

  Note that FIG. 3 shows an extremely different length between the long region 61 and the short region 62 where the distance between the rotating shaft 64 and the outer peripheral surface 63 is long in order to easily distinguish the long region 61 and the short region 62 of the deformed heat roller 60. It is shown as it is. However, the distance between the rotating shaft 64 and the outer peripheral surface 63 is not significantly different between the long region 61 and the short region 62. Therefore, when the long regions 61 face each other, the long regions 61 do not interfere with each other, and when the short regions 62 face each other, a gap is formed between the deformed heat roller 60 and the film material 30. It will not be done. This is because the pair of heat rollers 60 and 70 shown in FIG. 5, the deformed heat rollers 80 and 90 shown in FIGS. 6 and 7, the pair of heat rollers 100 and 105 shown in FIG. The same applies to the pair of heat rollers 110 and 115 shown in B) and the pair of heat rollers 120 shown in FIG.

  The pair of deformed heat rollers 60 gives strength to the peel strength of the heat-sealed film material 30 by changing the pressure when the film material 30 fed between the opposed outer peripheral surfaces 63 is sandwiched. .

  Specifically, as illustrated in FIG. 3A, when the film material 30 is sandwiched between the long regions 61, the pair of deformed heat rollers 60 sandwich the film material 30 with a relatively high pressure. Therefore, the pair of deformed heat rollers 60 forms a strong seal portion 51 having a relatively high peel strength on the film material 30. On the other hand, as shown in FIG. 3B, when the film material 30 is sandwiched between the short regions 62, the pair of deformed heat rollers 60 sandwich the film material 30 with a relatively low pressure. Therefore, the pair of irregularly shaped heat rollers 60 forms an easy peel seal portion 52 having a relatively low peel strength on the film material 30.

  Since each of the odd-shaped heat rollers 60 rotates around the rotation shaft 64, the film material 30 is alternately sandwiched between the long regions 61 and the short regions 62. Therefore, the strong seal portion 51 having a relatively high peel strength and the easy peel seal portion 52 having a relatively low peel strength are alternately formed in the longitudinal direction of the divided seal portion 45. Since the radius of the long region 61 is constant and the radius of the short region 62 is also constant, the film material 30 is sandwiched between the regions 61 and 62 with a constant pressure. In addition, since the long region 61 and the short region 62 are connected continuously (no step), the pressure continuously changes at the boundary between the long region 61 and the short region 62. Each deformed heat roller 60 rotates once while the film material 30 having a length corresponding to one of the packaging bags 1 is fed, and is easily peeled off at a position corresponding to two locations of the completed packaging bag 1. A part 52 is formed.

  The easily peelable seal portions 21 and 22 of the packaging bag 1 shown in FIG. 1 have a waveform that meanders in the vertical direction of the packaging bag 1. FIG. 4 shows an example of the deformed heat roller 60 that forms the easily peelable seal portions 21 and 22. The irregular heat roller 60 shown in FIG. 4 includes a corrugated seal surface 65 whose outer peripheral surface 63 meanders in the width direction of the irregular heat roller 60. The corrugated seal surface 65 is provided in a region 62 in which the distance between the rotating shaft 64 and the outer peripheral surface 63 of the irregular heat roller 60 is relatively short in the circumferential direction of the irregular heat roller 60.

  On the other hand, the strong seal portions 16, 17, and 18 of the packaging bag shown in FIG. 1 are formed by the seal surface 66 of the deformed heat roller 60. Both side edges of the seal surface 66 extend linearly in parallel with each other when the seal surface 66 is viewed from the front. The seal surface 66 is provided in a region 61 where the distance between the rotation shaft 64 and the outer peripheral surface 63 of the irregular heat roller 60 is relatively long in the circumferential direction of the irregular heat roller 60.

  The pair of deformed heat rollers 60 have outer peripheral surfaces 63 formed so as to be symmetric with respect to the film material 30. In addition, each deformed heat roller 60 has the same rotation speed and is rotated in the opposite directions. Therefore, when the two deformed heat rollers 60 are rotated, the film material 30 is sandwiched between the sealing surfaces 66 that form the strong seal portions 51, and the corrugated sealing surfaces 65 always face each other. The film material 30 is sandwiched. As a result, an easily peelable seal portion 52 and a strong seal portion 51 are formed.

  In the above, the case where both the heat rollers of the pair of heat rollers are deformed heat rollers has been described as an example. However, the pair of heat rollers can be configured by combining a heat roller having a circular cross section with a deformed heat roller.

[When only one heat roller is a deformed heat roller]
FIG. 5 shows a case where only one of the pair of heat rollers 60 and 70 forming the split seal portion 45 is the odd-shaped heat roller 60 and the cross section of the other heat roller 70 is circular. Is shown. In FIG. 5, the deformed heat roller 60 disposed below the film material 30 includes a fan-shaped portion (short region 62) having a constant radius in a constant range in the circumferential direction, and a radius of the fan-shaped portion. Further, fan-shaped portions (long regions 61) having a radius obtained by adding a certain distance to each other are alternately arranged in the circumferential direction, and the long regions 61 and the short regions 62 are combined in the circumferential direction to form an outer peripheral surface. 63 is configured. In contrast, the heat roller 70 disposed above the film material 30 has a circular cross-sectional shape, and the distance between the rotating shaft 74 and the outer peripheral surface 73 is constant over the entire circumference of the heat roller 70.

  The pair of heat rollers 60, 70 are opposed to the outer peripheral surfaces 63, 73 of the heat rollers 60, 70, and heat-seal the film material 30 fed between the outer peripheral surfaces 63, 73. Specifically, the pair of heat rollers 60 and 70 sandwich and peel the film material 30 with a relatively high pressure when the long region 61 of the deformed heat roller 60 faces the outer peripheral surface 73 of the heat roller 70. A strong seal portion 51 having a relatively high strength is formed. Further, the pair of heat rollers 60, 70 sandwich the film material 30 with a relatively low pressure when the short region 62 of the deformed heat roller 60 faces the outer peripheral surface 73 of the heat roller 70, and have a relative peeling strength. Therefore, an easily peelable seal portion 52 is formed.

  The pair of heat rollers 60 and 70 shown in FIG. 5 each rotate one time while the film material 30 having a length corresponding to one of the packaging bags 1 is sent to two places of the packaging bag 1 to be completed. Easy peel seal portions 52 corresponding to the easy peel seal portions 21 and 22 are formed.

  As described above, the deformed heat roller 60 provided on at least one of the pair of heat rollers has a fan-shaped portion (short region 62) having a constant radius in a certain range in the circumferential direction, and is further fixed to the radius of the fan-shaped portion. The case where the fan-shaped portions (long regions 61) having a radius to which the above distance is added is alternately arranged in the circumferential direction has been described as an example. However, the shape of the cross section of the irregular heat roller is not limited to this shape.

[Second-type deformed heat roller and its modification]
The deformed heat roller may be a second type whose cross-sectional shape is elliptical (see FIG. 8). The ellipse has a major axis and a minor axis. Therefore, on the outer peripheral surface of the ellipse, a constant region in the circumferential direction including the position of the long axis is configured as a long region, and a constant region in the circumferential direction including the position of the short axis is configured as a short region. In addition, for example, a deformed heat roller having a cross-sectional shape shown in FIGS. 6 and 7 can be used.

  6 has a region 81 in which the distance between the rotation shaft 84 and the outer peripheral surface 83 is relatively long and a region 82 in which the distance between the rotation shaft 84 and the outer peripheral surface 83 is relatively short. The outer peripheral surface 83 is formed by alternately combining them. The long region 81 and the short region 82 are arranged so as to be alternately arranged in the circumferential direction of the deformed heat roller 80, and are respectively provided at three locations in the circumferential direction. The long region 81 of the deformed heat roller 80 sandwiches the film material 30 with a relatively high pressure and forms a strong seal portion 51 having a relatively high peel strength. On the other hand, the short region 82 of the odd-shaped heat roller 80 sandwiches the film material 30 with a relatively low pressure to form an easy peel seal portion 52 having a relatively low peel strength.

  6 shows only one deformed heat roller 80, it may be arranged on both the one side and the other side of the film material 30 to form the split seal portion 45 on the film material, The deformed heat roller 80 is disposed only on one side or the other surface side of the film material 30, and the heat roller 70 (see FIG. 5) having a circular cross-sectional shape is disposed on the other side to be divided into the film material 30. The seal portion 45 may be formed.

  When the split seal portion 45 is formed using the deformed heat roller 80 shown in FIG. 6, the deformed heat roller 80 is rotated once while the film material 30 having a length corresponding to one of the packaging bags 1 flows. Easily peelable seal portions 52 are formed at three locations on the completed packaging bag 1.

  The deformed heat roller 90 shown in FIG. 7 includes a region 91 in which the distance between the rotation shaft 94 and the outer peripheral surface 93 is relatively long and a region 92 in which the distance between the rotation shaft 94 and the outer peripheral surface 93 is relatively short in the circumferential direction. The outer peripheral surface 93 is formed by alternately combining them. The long regions 91 and the short regions 92 are arranged so as to be alternately arranged in the circumferential direction of the odd-shaped heat roller 90, and are respectively provided at four locations in the circumferential direction. Also in the deformed heat roller 90, the long region 91 sandwiches the film material 30 with a relatively high pressure to form a strong seal portion 51 having a relatively high peel strength. Moreover, the short area | region 92 pinches | interposes the film material 30 with a relatively low pressure, and forms the easy peel seal | sticker part 52 with relatively low peel strength.

  The deformed heat roller 90 rotates once while the film material 30 having a length corresponding to one of the packaging bags 1 flows, and forms easy-open seal portions 52 at four locations of the completed packaging bag 1.

  As described above, a film having a length corresponding to one packaging bag 1 according to the number of regions where the distance between the rotation shaft and the outer peripheral surface is relatively long and the number of regions where the distance between the rotation shaft and the outer peripheral surface is relatively short. The case where a desired number of strong seal portions 51 and easy peel seal portions 52 are formed on the material 30 has been described. However, a film material having a length corresponding to one packaging bag 1 can be set by arbitrarily setting the distance between the rotating shaft and the outer peripheral surface of the deformed heat roller (outer diameter of the deformed heat roller) and the number of rotations of the deformed heat roller. A desired number of strong seal portions 51 and easily peelable seal portions 52 can be formed on 30.

  FIG. 8 shows a mode in which the split seal portion 45 is formed by rotating a pair of odd-shaped heat rollers 100, 105 having a small outer diameter at a high rotational speed, and a low rotation of the pair of odd-shaped heat rollers 110, 115 having a large outer diameter. The aspect which forms the division | segmentation seal | sticker part 45 by rotating by number is shown in comparison. In FIG. 8, irregular heat rollers 100 and 105 are second-type irregular heat rollers having an elliptical cross-sectional shape.

  In FIG. 8A, a pair of heat rollers 100 and 105 having a relatively small outer diameter is used, and the divided seal portions 45 are formed on the film material 30 by rotating the heat rollers 100 and 105 at a high rotational speed. An embodiment is shown. The heat roller disposed on the upper side of the film material 30 is a deformed heat roller 100 having an elliptical cross-sectional shape. On the other hand, the heat roller disposed on the lower side is a heat roller 105 having a circular cross section.

  In FIG. 8B, a pair of heat rollers 110 and 115 having relatively large outer diameters are used, and the divided seal portions 45 are formed in the film material 30 by rotating the heat rollers 110 and 115 at a low rotational speed. An embodiment is shown. The heat roller disposed on the upper side of the film material 30 is a deformed heat roller 110 having an elliptical cross-sectional shape. On the other hand, the heat roller disposed on the lower side is a heat roller 115 having a circular cross section.

  When the heat rollers 100 and 105 having relatively small outer diameters are used and the heat rollers 100 and 105 are rotated at a high rotational speed, as shown in FIG. The number of times that the long region 101 and the short region 102 sandwiching the film material 30 are interchanged with respect to L1 is large. Therefore, a large number of easily peelable seal portions 52 can be formed on the film material 30.

  On the other hand, when using the heat rollers 110 and 115 whose outer diameters are relatively large over the entire circumference and rotating the heat rollers 110 and 115 at a low rotational speed, as shown in FIG. For a certain length L1, the number of times that the long region 111 and the short region 112 sandwiching the film material are interchanged is small. Therefore, the number of easily peelable seal portions 52 formed on the film material 30 is reduced.

  Therefore, a desired number of easily peelable seal portions can be provided in a predetermined length range of the film material 30 by arbitrarily setting the outer diameter of the heat roller and the rotation number of the heat roller.

  As described above, the modified heat roller having the outer peripheral surface formed by alternately combining the region where the distance between the rotation shaft and the outer peripheral surface is long and the region where the distance between the rotation shaft and the outer peripheral surface is short in the circumferential direction has been described. In other words, the deformed heat roller having a cross-sectional shape other than a circular shape has been described. However, the split seal portion 45 has a circular shape of the cross section of the heat roller disposed on both the one surface side and the other surface side of the film material 30, and the rotation axis is radially outside the center of each heat roller. It can also be formed by using a deformed heat roller in a form located at the position.

[When a split seal is formed using a third type irregular heat roller]
FIG. 9 shows an outline of a process of forming the split seal portion 45 on the film material 30 using a pair of third-type deformed heat rollers 120. The deformed heat rollers 120 are arranged one by one on the one surface side and the other surface side of the film material 30 to be fed, and the outer peripheral surfaces 123 of the deformed heat rollers 120 face each other.

  The shape of the cross section of the third type odd-shaped heat roller 120 is circular. The rotating shaft 124 of each odd-shaped heat roller 120 is provided outside in the radial direction from the position of the center C of each odd-shaped heat roller 120 itself. Specifically, the rotation shaft 124 of each deformed heat roller 120 is provided at a position that coincides with the center C of the deformed heat roller 120 in the direction (the left-right direction in FIG. 9) in which the film material 30 is fed. . On the other hand, the rotating shaft 124 of each deformed heat roller 120 is further away from the film material 30 than the position of the center C of the deformed heat roller 120 in the direction perpendicular to the film material 30 (vertical direction in FIG. 9). Each is located in the direction. That is, in FIG. 9, the rotating shaft 124 of the odd-shaped heat roller 120 disposed above the film material 30 is positioned above the center C of the irregular heat roller 120 itself and disposed below the film material 30. The rotating shaft 124 of the deformed heat roller 120 is positioned below the center C of the deformed heat roller 120 itself.

  The pair of irregularly shaped heat rollers 120 has a rotational phase and speed set. Therefore, the regions 121 having a relatively long distance between the rotation shaft 124 and the outer peripheral surface 123 face each other, and the regions 122 having a relatively short distance between the rotation shaft 124 and the outer peripheral surface 123 face each other. When the pair of deformed heat rollers 120 forms the strong seal portion 51 having relatively high peel strength when the film material 30 is sandwiched between the long regions 121, and when the film material 30 is sandwiched between the short regions 122 The easily peelable seal portion 52 having a relatively low peel strength is formed.

  In the case where the split seal portion 45 is formed using the third type deformed heat roller 120, the predetermined length of the film material 30 is set by appropriately setting the diameter of the deformed heat roller 120 and the rotational speed of each deformed heat roller 120. A desired number of easily peelable seal portions 52 can be provided in this range.

[Operation of manufactured packaging bag]
The packaging bag 1 manufactured by the above manufacturing method can accommodate different types of fluid in the respective rooms 8 and 9 divided by the divided seal portion 15. The peel strength of the easy peel seal portions 21 and 22 constituting the split seal portion 15 is determined by closing the peel strength of the strong seal portions 16, 17 and 18 constituting the split seal portion 15 and the lower end 5 of the packaging bag 1. It is lower than the peel strength of the heat seal portions 11 and 12 closing the heat seal portions 13 and the side edges 6 and 7. Therefore, when pressure is applied to the packaging bag 1, only the easy-peeling seal portions 21 and 22 are peeled and the fluids stored in the rooms 8 and 9 are mixed.

  When the easily peelable seal portions 21 and 22 are provided at two or more locations of the split seal portion 15, the easily peelable seal portions 21 and 22 provided at two or more locations regardless of the position of the packaging bag 1 to which pressure is applied. Peel off. This will be specifically described with reference to FIG.

  FIG. 10 shows the packaging bag 1 having easily peelable seal portions 21 and 22 at two locations of the split seal portion 15. 10A shows a case where pressure is applied in the vicinity of the easy peel seal portion 21 provided on the left side of the packaging bag 1, and FIG. 10B shows an easy peel provided on the right side of the packaging bag 1. This is a case where pressure is applied in the vicinity of the seal portion 22.

  When pressure is applied in the vicinity of one of the easily peelable seal portions 21 and 22 provided in the packaging bag 1, as shown in FIGS. 10 (A) and 10 (B), it is provided on the upper side of the packaging bag 1. The internal pressure of the liquid stored in the room 8 rises uniformly as a whole. Therefore, the internal pressure of the chamber 8 acts on both of the two easy peel seal portions 21 and 22 provided on the right side and the left side of the packaging bag 1, and among the two easy peel seal portions 21 and 22. , At least one peels off. As a result, the fluids stored in the rooms 8 and 9 are mixed.

  Further, the split seal portion 15 that divides the inside of the packaging bag 1 is provided with easy peel seal portions 21 and 22 partially in the longitudinal direction of the split seal portion 15. Therefore, when the packaging bags 1 are stacked and transported in a state where the fluid is accommodated in each of the rooms 8 and 9, even when an unexpected pressure is applied to the packaging bag 1, the risk that the split seal portion 15 peels is It can be limited to an easily peelable seal portion.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Front part 3 Back part 4 Upper end 4a Folding line 5 Lower end 6,7 Side edge 8,9 Room 11, 12, 13 Heat seal part 15 Divided seal part 16, 17, 18 Strong seal part 21,22 Easy peeling Seal part 30 Film material 41, 43 Heat seal part 51 Strong seal part 52 Easy peel seal part 60 Deformed heat roller 61 Area where the distance between the rotating shaft and the outer peripheral surface is long 62 Area where the distance between the rotary shaft and the outer peripheral face is short 63 Outer periphery Surface 64 Rotating shaft 65 Waveform sealing surface 66 Sealing surface 70 Heat roller 73 Outer peripheral surface 74 Rotating shaft 80 Deformed heat roller 81 Region where the distance between the rotating shaft and outer peripheral surface is long 82 Region where the distance between the rotating shaft and outer peripheral surface is short 83 Outer periphery Surface 84 Rotating shaft 90 Deformed heat roller 91 Region where the distance between the rotating shaft and the outer peripheral surface is long 92 Region where the distance between the rotating shaft and the outer peripheral surface is short 93 Outer periphery 94 Rotating shaft 100 Deformed heat roller 101 Region where the distance between the rotating shaft and outer peripheral surface is long 102 Region where the distance between the rotating shaft and outer peripheral surface is short 103 Outer surface 104 Rotating shaft 105 Heat roller 106 Outer surface 107 Rotating shaft 110 Deformed heat roller 111 Region where the distance between the rotating shaft and the outer peripheral surface is long 112 Region where the distance between the rotating shaft and the outer peripheral surface is short 113 Outer surface 114 Rotating shaft 115 Heat roller 116 Outer surface 117 Rotating shaft 120 Deformed heat roller 121 Rotating shaft and outer peripheral surface Area 122 with a long distance 122 Area with a short distance between the rotating shaft and the outer peripheral surface 123 Outer peripheral surface 124 Rotating shaft

Claims (4)

The front surface portion is a split seal portion having an easily peelable seal portion whose peel strength at which the sealed front surface portion and the back surface portion are peeled is lower than the seal portion that seals the front surface portion and the back surface portion around the packaging bag. And a method of manufacturing a packaging bag in which the interior of the packaging bag is divided into a plurality of rooms by sealing the back surface portion,
The overlapped belt-like film material is continuously fed in the longitudinal direction, and continuously heated in the longitudinal direction of the film material by a pair of heat rollers at a predetermined position in the width direction orthogonal to the longitudinal direction of the film material. Including a heat sealing process to seal,
At least one heat roller of the pair of heat rollers includes a region where the distance between the rotation shaft and the outer peripheral surface is relatively long and a region where the distance between the rotation shaft and the outer peripheral surface is relatively short. Is a deformed heat roller provided in different regions in the circumferential direction of
The long region sandwiches the film material at a relatively high pressure to form a strong seal portion having a relatively high peel strength, and the short region sandwiches the film material at a relatively low pressure. To form an easily peelable seal portion having a relatively low peel strength.   The said deformed heat roller is a manufacturing method of the packaging bag of Claim 1 in which the outer peripheral surface of the said short area | region has a sealing surface meandering in the direction orthogonal to the longitudinal direction of the said film material. The number of the short regions provided in the deformed heat roller corresponds to the number of the easily peelable seal portions formed in one completed packaging bag,
While the film material is fed in the longitudinal direction of the film material by a distance corresponding to the height connecting the upper edge and the lower end of one packaging bag or the width connecting both side edges, The method for manufacturing a packaging bag according to claim 1 or 2, wherein the heat roller is rotated once.   The distance between the rotation shaft of the irregular heat roller and the outer peripheral surface, and the number of rotations of the irregular heat roller are set according to the number of the easily peelable seal portions formed in one packaging bag. The manufacturing method of the packaging bag of Claim 1 or 2.

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