JP2018027795A - Manufacturing method for packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a packaging bag, which can prevent the problem that regions other than a desired region are adhered when using a sealant layer derived from biomass as an innermost layer of the packaging bag.SOLUTION: The manufacturing method for a packaging bag performs in the following order: a step of obtaining laminated bodies by laminating a sealant film, which includes polyolefin system resin derived from biomass and has on one surface thereof an inner sealant layer set as the inside of the packaging bag of the sealant film, on a base material film laminated on a surface at the opposite side of the inner sealant layer of the sealant film; a step of forming an uneven structure on a surface of the inner sealant layer of the laminated body; and a step of obtaining the packaging bag by sealing a desired region while overlapping a pair of the laminated bodies with each other while making respective inner sealant layers of the bodies oppose to each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a packaging bag.

  In recent years, a packaging bag using a laminated body including a base material and a sealant layer has been used as a packaging bag for containing refill contents such as food and detergent (for example, Patent Document 1). In order to reduce the amount of petroleum resources used in the material of the sealant layer, aliphatic polyesters such as polylactic acid, polyhydroxybutyric acid, polycaprolactone, and polypropylene succinate have been developed. Furthermore, biomass polyethylene (plant-derived polyethylene) is attracting attention because it is environmentally friendly and has a quality close to that of petroleum polyethylene, since ethylene as a raw material monomer is obtained from biomass, compared to polyethylene derived from petroleum.

JP 2014-213937 A

  When a biomass-derived sealant layer is used as the innermost layer of the packaging bag, the low-molecular components contained in the biomass-derived polyethylene tend to cause the sealant layers facing each other to stick to each other. ) Was found to have a problem of being sealed with a weak adhesive force. As a result, when filling the contents, the filling port could not be sufficiently opened, causing a filling failure.

  The present invention has been made in view of the above-mentioned problems of the prior art, and prevents a problem that a region other than a desired region adheres when a biomass-derived sealant layer is used as the innermost layer of a packaging bag. One of the objects is to provide a method for manufacturing a packaging bag.

  The manufacturing method of the packaging bag in one aspect of the present invention is a manufacturing method of a packaging bag using a laminate in which at least a sealant film and a base film are stacked, including a polyolefin-based resin derived from biomass, and a sealant film By laminating the sealant film having an inner sealant layer on one side, which is the inner side of the packaging bag, and the base film laminated on the surface of the sealant film opposite to the inner sealant layer. A step of obtaining a laminate, a step of forming a concavo-convex structure on the surface of the inner sealant layer of the laminate, and a pair of the laminates in a state in which the inner sealant layers face each other in a desired state It is good also as a manufacturing method which performs the process of obtaining a packaging bag by sealing an area | region in this order.

  Moreover, the manufacturing method of the packaging bag in 1 aspect of this invention WHEREIN: The said inner side sealant layer is good also as a manufacturing method which contains 20 to 90% of the biomass-derived polyolefin resin.

  Moreover, the manufacturing method of the packaging bag in 1 aspect of this invention is good also as a manufacturing method whose height of the some unevenness | corrugation which comprises the said uneven structure is 5 micrometers or more and 40 micrometers or less.

  Moreover, the manufacturing method of the packaging bag in 1 aspect of this invention WHEREIN: It is good also as a manufacturing method in which the dispersion | variation in the height difference of these some unevenness | corrugations is less than 10%.

  Moreover, in the manufacturing method of the packaging bag in 1 aspect of this invention, as a manufacturing method which implements the process of obtaining the said packaging bag, without winding up the obtained said laminated body in roll shape after the process of obtaining the said laminated body. Also good.

  In the method for manufacturing a packaging bag according to an aspect of the present invention, the sealant film has a base material side sealant layer made of a petroleum-derived polyolefin on the surface opposite to the side laminated by the base material film laminate. It may be a manufacturing method.

  Moreover, in the manufacturing method of the packaging bag in 1 aspect of this invention, the said sealant film is an intermediate | middle sealant layer containing polyolefin derived from biomass and polyolefin derived from petroleum between the said inner side sealant layer and the said base material side sealant layer. It is good also as a manufacturing method which has.

  According to the present invention, in a method of manufacturing a packaging bag having a sealant film containing biomass-derived polyethylene, it is possible to prevent even a portion that does not require adhesion around a desired region when the sealant film is adhered. The manufacturing method of the packaging bag which can be provided can be provided.

It is a figure which shows the structure of a bag making apparatus, Comprising: (a) is a lamination part, (b) is a bag making part. The figure which shows the structure of an embossing roller. The flowchart for demonstrating the manufacturing method of a packaging bag. Process drawing which shows the uneven | corrugated formation process in the manufacturing method of a packaging bag. Sectional drawing which shows the structure of a laminated body.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

[Bag making equipment]
First, an embodiment of a bag making apparatus for continuously producing packaging bags will be described.
FIGS. 1A and 1B are diagrams showing a configuration of a bag making apparatus, in which FIG. 1A shows a laminate portion and FIG. 1B shows a bag making portion. FIG. 2 is a diagram illustrating a configuration of the embossing roller.
A bag making machine 10 shown in FIGS. 1A and 1B is a manufacturing apparatus for manufacturing a packaging bag 5 serving as a standing pouch. The bag making machine 10 includes a packaging material production unit 11 for producing the laminate 20 that becomes the body base material 2, and a bag making unit 12 that produces the packaging bag 5 using the produced laminate 20. Configured.

(Packaging Material Production Department)
The packaging material preparation unit 11 includes a sealant film supply unit 13, a base film supply unit 14, feed rollers 21 and 21, a pair of alignment rolls 15 and 15, a laminate unit 16, and an embossing unit 17. This is a region for obtaining the laminate 20 as a material.

The sealant film supply unit 13 and the base film supply unit 14 are located on one end side of the bag making machine 10, and the shaft portions 13a and 14a are parallel to each other and are shifted in the vertical direction.
The sealant film supply unit 13 is a reel for feeding out the sealant film 18 wound in a roll shape around the shaft portion 13a. The base film supply unit 14 is a reel for feeding out the base film 19 wound in a roll shape around the shaft portion 14a. The sealant film supply unit 13 and the base film supply unit 14 can continuously feed the sealant film 18 and the base film 19 by driving the feed rollers 21 and 21.

  The sealant film 18 and the base film 19 are each made of a long film, and are fed out from the sealant film supply unit 13 and the base film supply unit 14 in the same transport direction.

  As shown in FIG. 4, the sealant film 18 used in the present embodiment is an inner sealant layer 18 </ b> A that is the inner side of the packaging bag 5, an intermediate sealant layer 18 </ b> B, and a base material side sealant layer that is a layer in contact with the base film 19. A laminated film having a three-layer structure in which 18C is laminated in this order.

The inner sealant layer 18A contains 20% or more and 100% or less of a biomass-derived polyolefin resin, and more preferably contains 50% or more of the entire layer. The inner sealant layer 18A can have a density of 0.91 to 0.96 kg / m ³ , for example, 0.91 to 0.94 kg / m ³ . The thickness of the inner sealant layer 18A can be 15 to 70 μm. From the environmental viewpoint, it is preferable that the biomass-derived polyolefin is 50% or more.

The intermediate sealant layer 18B contains 20% or more and 100% or less of a biomass-derived polyolefin resin, and can have a density of 0.91 to 0.96 kg / m ³ , for example, 0.91 to 0.94 kg / m ^{3. 3} . The thickness of the intermediate sealant layer 18B can be 20 to 90 μm. From the environmental viewpoint, the proportion of polyolefin derived from biomass is preferably 50% or more, and the thickness of the intermediate sealant layer 18B is preferably the same as or thicker than the inner sealant layer 18A. It is preferable that the thickness is equal to or thicker than the side sealant layer 18C.

The base material-side sealant layer 18C does not include biomass-derived polyolefin resin and preferably contains petroleum-derived polyolefin resin as a main component, but biomass-derived polyolefin can also include 1% or more and 20% or less, It can be a density 0.91~0.96kg / ^{m 3,} such as 0.91~0.94kg / ^{m 3.} The thickness of the base material-side sealant layer 18C can be 15 to 40 μm. From the viewpoint of adhesiveness to the base film 19, the base material-side sealant layer 18C has a biomass-derived polyethylene ratio of 20% or less, whether or not an adhesive is used. Preferably, it is 10% or less.
The amount of biomass-derived polyolefin resin contained in the sealant film 18 is 20% or more and 90% or less as a blending ratio with respect to the entire film.

  Several specific examples of the sealant film used in the method for producing a packaging bag of the present invention are described below.

<Sealant film>
Base material side sealant layer 18C: Layer of petroleum-derived polyolefin resin 100 parts by mass (thickness 20 to 32 μm)
Intermediate sealant layer 18B: a layer in which petroleum-derived polyolefin resin is mixed at a ratio of 2.9 parts by mass with respect to 100 parts by mass of plant-derived polyolefin resin (thickness: 50 to 80 μm)
Inner sealant layer 18A: a layer in which petroleum-derived polyolefin resin is mixed at a ratio of 4.4 parts by mass with respect to 100 parts by mass of plant-derived polyolefin resin (thickness: 30 to 48 μm)

<Sealant film>
Base material side sealant layer 18C: Layer of petroleum-derived polyolefin resin 100 parts by mass (thickness 27 to 37 μm)
Intermediate sealant layer 18B: layer obtained by mixing petroleum-derived polyolefin resin at a ratio of 23.9 parts by mass with respect to 80 parts by mass of plant-derived polyolefin resin (thickness 27 to 37 μm)
Inner sealant layer 18A: a layer composed of 100 parts by mass of a plant-derived polyolefin resin (thickness 27 to 37 μm)

<Sealant film>
Base material side sealant layer 18C: Layer of petroleum-derived polyolefin resin 100 parts by mass (thickness 20 to 32 μm)
Intermediate sealant layer 18B: a layer in which petroleum-derived polyolefin resin is mixed at a ratio of 3.9 parts by mass with respect to 100 parts by mass of plant-derived polyolefin resin (thickness: 50 to 80 μm)
Inner sealant layer 18A: a layer in which petroleum-derived polyolefin resin is mixed at a ratio of 5.7 parts by mass with respect to 100 parts by mass of plant-derived polyolefin resin (thickness: 30 to 48 μm)

  1 is disposed downstream of the sealant film supply unit 13 and the base film supply unit 14 in the transport direction, and the sealant film supply unit 13 and the base film supply are provided therebetween. The sealant film 18 and the base film 19 supplied from each of the parts 14 are sandwiched. The alignment rolls 15 and 15 are movable in the width direction of the sealant film 18 and the base film 19 so that the front and rear, left and right positions of the films 18 and 19 are accurately superimposed. The pair of alignment rolls 15, 15 corrects the positional deviation along the feed direction and the width direction of the sealant film 18 and the base film 19. The base material film 19 is laminated on the base material side sealant layer 18 </ b> C side opposite to the inner sealant layer 18 </ b> A of the sealant film 18.

  The laminate unit 16 includes a heating roll 16A and a back roll 16B that are heated to a predetermined temperature. The laminated sealant film 18 and the base film 19 are sandwiched between the heating roll 16A and the back roll 16B, and are laminated by performing thermocompression bonding at a predetermined heating temperature and pressure, whereby a laminated body 20 is obtained.

  The heat sealing temperature needs to be performed at a temperature lower than the melting point of the base film 19 to be bonded to the sealant film 18. When thermocompression bonding is performed at a temperature higher than the melting point of the base film 19 to be bonded to the sealant film 18, there is a problem that the base film 19 adheres to the heating roll 16A and the surface of the resin becomes rough. In the step of thermal bonding, it is preferable to select the thermocompression bonding temperature and the applied pressure. Adhesive strength is improved by increasing the thermocompression bonding temperature, time and pressure. Here, the conditions for obtaining the target adhesive strength may be appropriately selected.

  The embossing part 17 shown in FIG. 1 has the embossing roll 17A in which the some recessed part 7a made into the strip | belt-shaped pattern as shown in FIG. 2 and the some convex part 7b exist alternately in the circumferential direction. The embossing roll 17 </ b> A is disposed on the side of the laminate 20 that faces the inner sealant layer 18 </ b> A, and extends in the width direction of the laminate 20.

In the present embodiment, as shown in FIG. 2, the height H ₁₇ (depth U ₁₇ of the plurality of recesses 7 a) of the plurality of projections 7 b is preferably 5 μm or more and 40 μm or less, and the height of each projection 7 b is high. The embossing roll 17A is used in which the variation in the height H ₁₇ (depth U ₁₇ of each recess 7a) is within 10%.

  In addition, in this embodiment, although the cross-sectional shape of the convex part 7b in the direction which cross | intersects the extending direction of the embossing roll 17A has comprised triangular shape, it is not restricted to this. The cross-sectional shape of the convex portion 7b may be a semicircular shape, a rectangular shape, or the like, and is not particularly limited as long as a concavo-convex structure can be formed on the inner sealant layer 18A side of the laminate 20.

<Base film>
The substrate film 19 may be a single layer or a laminated body, and may be a polyethylene terephthalate (PET) resin film, a polyamide (PA) resin film, a polyethylene naphthalate (PEN) resin film, a polyacrylonitrile (PAN) resin film, or a polycarbonate (PC). Resin films, polyimide (PI) resin films, and the like can be used. Moreover, a vapor deposition layer, metal foil, a printing layer, and a functional layer can be included. The thickness of the base film 19 can be 10 to 200 μm.

(Bag making part)
The bag making unit 12 includes a laminated body double leaf unit 42, buffer units 41 and 41, bottom base material insertion units 22 and 22, seal units 45 and 46, intermittent drive units 43 and 48, cutters 42a and 47a, and a guillotine cutter 47b. It is an area where a plurality of packaging bags are produced from a long laminate 20 by chamfering.

  The laminate double leaf forming means 42 has a cutter 42a that cuts (semi-cuts) the laminate 20 having a plurality of irregularities formed on one side into two at the center in the width direction to form a plurality of body base materials 2 and 2. doing.

  The buffer means 41 and 41 are means for forming a variable amount of buffer on the trunk base materials 2 and 2 supplied by continuous feeding from the laminated body multi-leafing means 42, for example, a pair of upper and lower or a plurality of pairs of dancers A roll 41a is provided.

  The bottom base material insertion means 22 and 22 are means for inserting the bottom base material 3 between the biplane body base materials 2 and 2. Since the bag making machine 10 of this embodiment is chamfered, bottom base material insertion means 22 and 22 are provided on both sides of the body base materials 2 and 2 in the width direction, respectively. Note that the bottom base material insertion means 22 is a means required when manufacturing the packaging bag 5 having the bottom, and is not necessary when manufacturing a package without a bottom.

  The intermittent drive means 43 is provided behind the buffer means 41, 41, and the width direction both side ends of the body base materials 2, 2 by the pair of body base materials 2, 2 and the bottom base material insertion means 22. The bottom base material 3 inserted between the parts is overlapped and conveyed.

  The intermittent drive means 48 is provided further behind the intermittent drive means 43 via the vertical seal means 45 and the horizontal seal means 46. As the intermittent drive means 43 and 48, for example, a servo motor is used.

  The vertical sealing means 45 includes a pair of heaters 45a and 45a and a pair of cooling units 45b and 45b provided on both sides in the width direction of the body base materials 2 and 2, respectively. 45b are arranged along the conveying direction of the body base materials 2 and 2, respectively. The vertical sealing means 45 is a device for heat-sealing the region that becomes the bottom 5a of the packaging bag 5 of the body base materials 2 and 2 by heating by the heater 45a and subsequent cooling by the cooling unit 45b.

  The horizontal sealing means 46 has a pair of heaters 46a and 46a and a pair of cooling parts 46b and 46b respectively arranged at predetermined intervals in the conveying direction of the body base materials 2 and 2, each of which is It arrange | positions so that it may extend along the width direction of the trunk | drum base materials 2 and 2. As shown in FIG. The horizontal sealing means 46 is a device for heat-sealing the regions to be the side portions 5b and 5b of the body base materials 2 and 2 by heating by the heater 46a and subsequent cooling by the cooling portion 46b.

  In the region where the double leaf body base materials 2 and 2 are sealed by the vertical seal means 45 and the horizontal seal means 46, the double leaf body base materials 2 and 2 are intermittently transported, and the operation of the transport is stopped periodically. It is controlled to repeat automatically. The operations of the vertical sealing means 45 and the horizontal sealing means 46 are controlled so as to perform sealing when the conveyance is stopped in synchronization with the conveyance of the body base materials 2 and 2. The positioning of the trunk base materials 2 and 2 at the time of stopping is accurate, and the positional accuracy necessary for heat sealing is ensured. Here, the intermittent drive means 43 and 48 described above can be controlled to perform intermittent feed synchronized with the intermittent feed of the double-leaf body base materials 2 and 2 in the seal means 45 and 46.

The cutter 47a is disposed at the center in the width direction of the body base materials 2 and 2 behind the vertical sealing means 45 and the horizontal sealing means 46, and cuts the body base materials 2 and 2 along the longitudinal direction thereof.
The guillotine cutter 47b is disposed further rearward than the cutter 47a via the intermittent drive means 48, cuts the long body base materials 2 and 2 in the width direction, and is separated into individual packaging bags 5, 5,. To do. In the present embodiment, two packaging bags 5 and 5 can be manufactured at the same time due to the two chamfering.

[Method of manufacturing packaging bag]
Next, an embodiment of a method for producing a packaging bag according to the present invention using the above-described bag making apparatus will be described.
FIG. 3 is a flowchart for explaining the manufacturing method of the packaging bag. FIG. 4 is a process diagram showing an unevenness forming process in the method for manufacturing a packaging bag. FIG. 5 is a cross-sectional view showing the configuration of the laminate.

  As shown in FIG. 3, the manufacturing method of the packaging bag in this embodiment mainly includes a laminating step S1, an unevenness forming step S2, a sealing step S3, and a separation step S4.

(1) Lamination process S1
First, the sealant film 18 and the base film 19 continuously fed from the sealant film supply unit 13 and the base film supply unit 14 are laminated and laminated by the feed rollers 21 and 21. When an adhesive is used in the laminating step S1, it can be bonded using a known laminating adhesive, and the adhesive can be applied on the base-side sealant layer 18C to be laminated. . When the adhesive is not used, the base film 19 is overlapped on the base material side sealant layer 18C of the sealant film 18 and heated to melt the base material side sealant layer 18C. As the adhesive layer with the base film 19, the sealant film 18 and the base film 19 are bonded.

  The laminated body 20 is obtained by being bonded by thermocompression bonding with the heating roll 25 and the backup roll 26 held at a predetermined temperature, and only one of the up and down directions is used as a heating roll. It is good.

(2) Concavity and convexity forming step S2
Next, in the embossed portion 17, the uneven surface 17 </ b> B of the emboss roll 17 </ b> A heated to a predetermined temperature is pressed against the surface of the inner sealant layer 18 </ b> A of the obtained laminate 20, so The convex part 8 and the plurality of concave parts 6 are formed (FIG. 4). As shown in FIG. 4, convex portions 8 and concave portions 6 are alternately formed in the transport direction (longitudinal direction) of the laminate 20. Thereby, the laminated body 20 which has the uneven structure 9 in the surface 18a of the inner side sealant layer 18A is obtained. The plurality of convex portions 8 are preferably formed only from the inner sealant layer 18A from the viewpoint of the accuracy of forming the irregularities. That is, it is preferable that the concavo-convex structure 9 does not reach the intermediate sealant layer 18B of the laminate 20.

In this step, by using the embossing roll 17A having the above-described configuration, the height H ₂₀ of each convex portion 8 (depth U _{20 of the} concave portion 6) is 5 μm or more and 40 μm or less, and each height h ₂₀ ( The variation of the depth U ₂₀ ) is within 10%.

  Here, the uneven structure 9 reflecting the uneven shape of the uneven surface 17B of the embossing roll 17A is formed on the surface 18a of the inner sealant layer 18A. Therefore, a desired uneven structure can be formed on the inner sealant layer 18A by changing the uneven structure of the uneven surface 17B of the embossing roll 17A. Moreover, in order to form a desired unevenness | corrugation uniformly, the back roll which opposes the embossing roll 17A can also be provided so that the laminated body 20 may be pinched | interposed with the embossing roll 17A and a back roll.

In this embodiment, the laminated body 20 in which the concavo-convex structure 9 is formed after the concavo-convex forming step S2 can be transported without being wound, and the next step can be performed. In this case, since each process of uneven | corrugated formation process S2 and sealing process S3 can be implemented continuously, since the laminated body 20 does not raise | generate a blocking and the thermal history of a heating and cooling is not large also on the sealant film 18, it is preferable. .
Moreover, after winding up once after uneven | corrugated formation process S2, sealing process S3 can also be implemented. In this case, the laminating step S1 and the concavo-convex forming step S2 and the subsequent steps can be performed by separate facilities, which is preferable from the viewpoint of flexibility in facilities.

(3) Sealing step S3
Next, the laminated body 20 is cut at the center in the width direction by the cutter 42 a of the laminated body double leaf forming means 42 to obtain two body base materials 2 and 2. Thereafter, the body base materials 2, 2 with the inner sealant layer 18 </ b> A side on which the concavo-convex structure 9 is formed opposed to each other, and the bottom base material insertion means 22 on both side ends in the width direction of the body base materials 2, 2 The bottom base material 3 inserted therebetween is transported in an overlapping manner, and the desired regions of the base materials 2, 2, 3 are sealed. Specifically, it is a region that is a periphery of the packaging bag 5 to be manufactured, and a region excluding a filling port (not shown) for filling the contents later is sealed.

  First, a vertical seal of these laminated portions is performed along the conveying direction of the trunk base materials 2 and 2 and the bottom base material 3. Specifically, the region to be the bottom portion 5a of the packaging bag 5 of the body base materials 2 and 2 is heat-sealed by heating by the heater 45a and subsequent cooling by the cooling portion 45b.

  Subsequently, horizontal sealing is performed along the width direction of the body base materials 2 and 2. Specifically, the regions to be the both side portions 5b and 5b of the body base materials 2 and 2 are heat-sealed by heating by the heater 46a and subsequent cooling by the cooling portion 46b.

(4) Separation step S4
Next, the center part in the width direction of the heat-sealed body base materials 2, 2 is cut in half by the cutter 47 a and cut along the width direction of the body base materials 2, 2 by cutting the two packaging bags 5, 5. 5 is separated. In this way, a plurality of packaging bags 5 are manufactured.

  Conventionally, a biomass-derived laminated film having a sealant layer is known, but due to the sticking of low molecular components contained in the sealant layer, the slipperiness is poor and the processing suitability is not excellent. Moreover, the blocking property between laminated films is also poor. For this reason, when using the laminated body 20 which has the biomass-derived inner sealant layer 18A, it is desired in the sealing step S3 due to the low molecular components of the inner sealant layers 18A of the opposing body base materials 2 and 2. There was a problem that the inner surfaces of the areas other than the seal area were bonded together with extremely weak force. That is, although it is a region that is not sealed by the sealing means 45 and 46 described above, the central portion of the region that becomes the packaging bag 5 and the vicinity of the filling port are adhered to each other with a very weak force to fill the contents. In some cases, the filling port could not be opened sufficiently.

  On the other hand, in the present embodiment, the concavo-convex structure 9 is formed in advance on the surface 18a of the inner sealant layer 18A that is one surface side of the laminate 20 before bag making. As a result, the contact area between the inner surfaces (inner sealant layer 18A) of the trunk base materials 2 and 2 is reduced, and the sealability other than the desired region is weakened. Therefore, in a sealing process, when heat-sealing a desired sealing area | region among the trunk | drum base materials 2 and 2 and the bottom base material 3, it suppresses that an unintended part other than a desired sealing area | region sticks. it can.

As described above, when the inner sealant layer 18A derived from biomass is used as the innermost layer of the packaging bag 5 by providing the inner sealant layer 18A of the laminate 20 with a plurality of uneven structures 9 in advance, for example, a sealing step In S3, it is possible to prevent even the portion around the desired seal region that does not need to be bonded, and to prevent blocking between the body base materials 2 and 2. For this reason, the vicinity of the filling port of the packaging bag 5 is not narrowed more than necessary, and the filling port for filling the contents into the packaging bag 5 in a subsequent process can be sufficiently opened.
By using the manufacturing method of this embodiment, the packaging bag 5 which can relieve the opening defect of a filling port and can reduce the filling defect of the content can be obtained.
Furthermore, in the sealing step S3, it is possible to improve the productivity of the packaging bag 5 by preventing the periphery of the desired sealing region from adhering to the portion that does not need to be adhered. There is also a resource saving effect that the number can be reduced.

  Moreover, in this embodiment, if the uneven | corrugated formation process S2 is performed immediately before sealing process S3, the temperature history concerning the laminated body 20 may be small. Once the temperature history is applied, the functional group of the polyolefin in the inner sealant layer 18A is oxidized, and the adhesiveness is likely to deteriorate, or the manufactured packaging bag 5 is likely to meander. The temperature change of the laminated body 20 can be suppressed by performing the sealing process S3 continuously after the unevenness forming process S2 without winding up the laminated body 20 on which the structure 9 is formed. Thereby, the flat packaging bag 5 which does not meander on the outer surface and can be manufactured can be manufactured.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  In the above-described embodiment, the method using the embossing roller in the concavo-convex forming step has been described. However, the present invention is not limited to this, and other methods may be used as long as the desired concavo-convex structure can be imparted to the surface 18a of the inner sealant layer 18A. May be. For example, a method of pressing the inner sealant layer 18A using an extrusion cooling roll, a method of pressing with a concavo-convex mold, and the like can be mentioned.

  DESCRIPTION OF SYMBOLS 2 ... Base material, 5 ... Packaging bag, 8 ... Convex part, 9 ... Uneven structure, 15 ... Roll, 18 ... Sealant film, 18A ... Inner sealant layer, 18a ... Surface, 18B ... Intermediate sealant layer, 18C ... Base material side Sealant layer, 19 ... base film, 20 ... laminate, H20 ... height of convex part

The manufacturing method of the packaging bag in one aspect of the present invention is a manufacturing method of a packaging bag using a laminate in which at least a sealant film and a base film are stacked, and the sealant film and the base film are stacked at least. A method for manufacturing a packaging bag using the laminated body, wherein the sealant film has an inner sealant layer, an intermediate sealant layer, and a base material side sealant layer in this order, which are the inner side of the packaging bag. None of the inner sealant layer comprises a polyolefin resin derived from biomass, and the substrate-side sealant layer before Symbol sealant film, a step of obtaining a laminate by laminating, said base film, said forming only the uneven structure surface of the inner sealant layer of the laminate, a pair of the laminate, to one another of the inner sealer A step of the coat layer in a state superimposed by opposite obtain packaging bag by sealing the desired region may be a manufacturing method of performing in this order.

Claims (7)

A method for producing a packaging bag using a laminate in which at least a sealant film and a base film are laminated,
The sealant film containing a polyolefin-based resin derived from biomass and having an inner sealant layer on one side of the sealant film that is the inner side of the packaging bag, and laminated on the opposite side of the sealant film from the inner sealant layer A step of obtaining a laminate by laminating the base film;
Forming an uneven structure on the surface of the inner sealant layer of the laminate;
A method of manufacturing a packaging bag, wherein a step of obtaining a packaging bag by sealing a desired region in a state where the pair of the laminated bodies are overlapped with the inner sealant layers facing each other is arranged in this order. The inner sealant layer contains 20% or more and 90% or less of the biomass-derived polyolefin resin.
The manufacturing method of the packaging bag of Claim 1. The height of each of the plurality of convex portions constituting the concavo-convex structure is 5 μm or more and 40 μm or less.
The manufacturing method of the packaging bag of Claim 1. Variation in height difference of the plurality of convex portions is within 10%.
The manufacturing method of the packaging bag of Claim 3. After the step of obtaining the laminate, carrying out the step of obtaining the packaging bag without winding the obtained laminate into a roll,
The manufacturing method of the packaging bag of Claim 1. The sealant film has a base material side sealant layer made of a polyolefin derived from petroleum on the surface opposite to the side laminated by the base film and laminate,
The manufacturing method of the packaging bag of Claim 1. The sealant film has an intermediate sealant layer containing a biomass-derived polyolefin and a petroleum-derived polyolefin between the inner sealant layer and the base material-side sealant layer.
The manufacturing method of the packaging bag of Claim 6.

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