JP2017218199A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of improving convenience.SOLUTION: A packaging bag 1 is formed by overlapping a transparent resin sheet 100 having an intermediate layer 15 having gas barrier property against predetermined gas arranged between a base material layer 11 and a thermally adhesive resin layer 17, and bonding a circumference thereof by the thermally adhesive resin layer 17, has a cut portion 60 formed of a half-cut line formed on the base material layer 11 of a front face portion 5 and a back face portion 6 facing each other, and has a light absorption layer 13 containing a light absorption material having high light absorptivity to a laser beam having a predetermined wavelength region provided between the base material layer 11 and an intermediate layer 15 in a region overlapping the cut portion 60.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a packaging bag that is opened by breaking a cut portion made of a half-cut line.

  A conventional packaging bag is disclosed in Patent Document 1. This packaging bag is formed by stacking a resin sheet having a heat-adhesive resin layer on the inner surface side, and thermally adhering the peripheral edges of the front and back portions facing each other with a heat-adhesive resin layer. The resin sheet is laminated by disposing an intermediate layer made of aluminum foil between the base material layer and the heat-adhesive resin layer. The intermediate layer prevents water vapor, oxygen, and the like from permeating into the inside of the packaging bag, and ensures the gas barrier properties of the packaging bag.

  Cut portions made of half-cut lines are provided on the base material layers on the front and back portions, respectively. The cutting part is formed by irradiating the resin sheet with carbon dioxide laser light from the outside of the base material layer. At this time, since the laser light reaching the intermediate layer is reflected by the intermediate layer, it is possible to prevent the gas barrier property of the packaging bag from being lowered due to the penetration of the intermediate layer. The packaging bag is opened when the user breaks the front and back cut portions.

JP-A-2016-8066 (7th page, 8th page, FIG. 1, FIG. 3)

  However, according to the conventional packaging bag, since the intermediate layer of the resin sheet is made of aluminum foil, the user cannot visually recognize the inside of the packaging bag. Further, when inspecting a packaging bag containing contents, it is difficult to detect a metal piece mixed in the inside of the packaging bag with a metal detector. For this reason, there was a problem that the convenience of the packaging bag was bad.

  An object of this invention is to provide the packaging bag which can improve the convenience.

  In order to achieve the above object, the present invention provides a transparent resin sheet in which an intermediate layer having a gas barrier property against a predetermined gas is placed between a base material layer and a heat-adhesive resin layer, and a peripheral edge of the heat-adhesive layer. In a packaging bag formed by bonding with a resin layer, the base of the region that has a cut portion made of a half-cut line formed in each of the base layer on the front surface portion and the back surface portion facing each other and overlaps the cut portion A light absorption layer including a light absorption material having high light absorption with respect to laser light in a predetermined wavelength region is provided between the material layer and the intermediate layer.

  According to this configuration, the packaging bag is formed by adhering the peripheral edges of the stacked resin sheets with the heat-adhesive resin layer. A cut portion of a half cut line is formed by irradiating the base layer of the front and back portions of the packaging bag facing each other from the outside. At this time, the laser light is absorbed by the light absorption layer outside the intermediate layer, and damage to the intermediate layer is prevented. The packaging bag is opened by breaking the front part and the back part on the cut part.

  In the packaging bag having the above structure according to the present invention, it is preferable that the intermediate layer is made of a vapor deposition film of silica or alumina.

  In the packaging bag having the above-described configuration, it is preferable that the light absorption layer is formed of a laser marking ink that absorbs laser light in the wavelength range and develops color.

  In the packaging bag having the above-described configuration, it is preferable that the light absorbing material has an absorption band in a wavelength region of carbon dioxide laser light.

  In the packaging bag having the above-described configuration, it is preferable that the light absorbing material includes molybdenum trioxide and titanium oxide.

  Moreover, this invention is preferable when the said light absorption layer is formed on the said base material layer in the packaging bag of the said structure.

  In the packaging bag having the above-described configuration, the present invention is preferably such that the light absorption layer is formed in a narrow band shape overlapping the cut portion.

  In the packaging bag having the above-described configuration, the cutting portion of the front surface portion and the cutting portion of the back surface portion are arranged at different positions in the vertical direction at the center portion in the left-right direction, and the light absorption layer is It is preferable to form a thin strip that overlaps the cut portion of the front portion and the cut portion of the back portion.

  According to the present invention, a light absorbing layer including a light absorbing material having high light absorption with respect to laser light in a predetermined wavelength region is provided between a base material layer and an intermediate layer in a region overlapping with a cut portion made of a half-cut line. ing. For this reason, when irradiating a laser beam and forming a cut part in a base material layer, a laser beam is absorbed by a light absorption layer and damage to an intermediate layer which has gas barrier properties is prevented. Therefore, the packaging bag can be formed transparently while ensuring gas barrier properties, and the convenience of the packaging bag can be improved.

The front view of the packaging bag of 1st Embodiment of this invention Sectional drawing of the resin sheet which forms the packaging bag of 1st Embodiment of this invention The front view which shows a mode that it cut | disconnected along the cutting part of the packaging bag of 1st Embodiment of this invention. The front view of the packaging bag of 2nd Embodiment of this invention The front view which shows an example cut | disconnected along the cutting part of the packaging bag of 2nd Embodiment of this invention. The front view which shows the other example cut | disconnected along the cutting part of the packaging bag of 2nd Embodiment of this invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a front view of the packaging bag of the present embodiment. The packaging bag 1 is formed by a so-called standing pouch, and has a bag body 2 and a chuck member 3. The chuck member 3 is formed of resin and is bonded to the inner surface of the upper portion of the bag body 2.

  The bag body 2 is made of a transparent resin sheet 100 and has a front surface portion 5, a back surface portion 6, and a bottom surface portion 8. On the periphery of the bag body 2, a heat bonding portion 21 is formed by heat bonding the heat adhesive resin layers 17 (see FIG. 2) disposed on the inner surface of the resin sheet 100.

  The front surface portion 5 and the back surface portion 6 are opposed to each other, and the upper portion and the upper end portion of the side end are bonded by the heat bonding portion 21. The bottom surface portion 8 is folded in half between the resin sheet 100 and sandwiched between the lower portion of the front surface portion 5 and the lower portion of the rear surface portion 6. Thermally bonded. The upper end portion of the bag body 2 is opened, and after the contents S are stored, the bag body 2 is thermally bonded by the heat bonding portion 21.

  A plurality of unbonded unbonded portions 9 are provided in the heat bonded portions 21 at the left and right end portions of the bottom surface portion 8. The unbonded portion 9 can prevent the bottom surface portion 8 from curling due to heat shrinkage during the heat bonding process.

  A storage portion 4 for storing the contents S is formed below the chuck member 3 of the bag body 2. The upper surface of the storage portion 4 is opened and closed by opening and closing the chuck member 3. The content S is not particularly limited, and examples thereof include foods such as liquids, gels, solids, and powders, cosmetics, detergents, and pharmaceuticals.

  Information (characters, designs, etc.) on the contents S is printed on the outer surfaces of the front surface portion 5 and the back surface portion 6. In addition, you may stick the sheet | seat on which the information regarding the content S was printed on the outer surface of the front part 5 and the back part 6. FIG.

  V-shaped notches 29 are formed on the thermal bonding portions 21 on both side edges of the bag body 2 above the chuck member 3. Further, a cutting portion 60 made of a half cut line extending in the left-right direction is formed above the chuck member 3 on the front surface portion 5 and the back surface portion 6. In addition, the shape of the notch part 29 is not limited to V shape, I shape, U shape, and a home base shape may be sufficient.

  The cutting part 60 has an inclined part 61 and a straight part 62. The inclined portion 61 is formed in a V shape along the notch portion 29. The inner end 62 a of the inclined portion 61 is disposed on the inner side than the thermal bonding portion 21. The straight portion 62 extends linearly in the left-right direction, and connects the left and right inclined portions 61. The inclined portion 61 may be formed in a U shape or a U shape along the notch portion 29.

  The inclined portion 61 of the front surface portion 5 and the inclined portion 61 of the back surface portion 6 are formed so as to overlap each other when viewed from the front, and the straight portion 62 of the front surface portion 5 and the straight portion 62 of the back surface portion 6 are overlapped when viewed from the front. That is, the cutting portion 60 of the front surface portion 5 and the cutting portion 60 of the back surface portion 6 are formed at the same position in the vertical direction from the left end portion to the right end portion of the upper portion of the bag body 2.

  FIG. 2 is a cross-sectional view of the vicinity of the cutting portion 60 of the resin sheet 100 on the front surface portion 5. In addition, since the structure of the resin sheet 100 of the back surface part 6 is the same as that of the resin sheet 100 of the front surface part 5, the resin sheet 100 of the front surface part 5 is demonstrated as a representative.

  The resin sheet 100 is formed by laminating the base material layer 11, the intermediate layer 15, and the thermoadhesive resin layer 17 in order from the outside to the inside of the bag body 2. The base material layer 11 and the intermediate layer 15 are bonded via an adhesive layer 14, and the intermediate layer 15 and the thermoadhesive resin layer 17 are bonded via an adhesive layer 16.

  A printing layer 12 for printing a pattern or the like is formed at a predetermined position on the lower surface (on the intermediate layer 15 side) of the base material layer 11. The print layer 12 may be provided on the upper surface (outside) of the base material layer 11. Moreover, the light absorption layer 13 is provided on the lower surface of the base material layer 11 in a region R1 (see FIG. 1) that overlaps the cutting portion 60 of the resin sheet 100. Note that the printing layer 12 may be provided on the lower surface of the light absorption layer 13.

  The base material layer 11 is formed of, for example, a biaxially stretched polyethylene terephthalate (PET) film having a thickness of about 9 to 25 μm. For example, a thermoplastic resin such as a polyester film, a polyolefin film, or a polyamide film stretched uniaxially or biaxially can be used as the base material layer 11. The printing layer 12 is formed to a thickness of about 1 to 5 μm with ink disposed at a predetermined position on the base material layer 11.

  The intermediate layer 15 is formed of, for example, a deposited film obtained by depositing a transparent deposited film 15b on the lower surface of a transparent resin film 15a having a thickness of about 10 to 25 μm. Thereby, the intermediate | middle layer 15 has gas barrier property with respect to gas, such as water vapor | steam and oxygen, by the transparent vapor deposition film | membrane 15b. The transparent resin film 15a is formed of, for example, a polyester film or a polyamide film. The transparent vapor deposition film 15b is formed of silica, alumina, or the like.

  The thermal adhesive resin layer 17 is formed of, for example, an unstretched polypropylene (CPP) film having a thickness of about 25 to 150 μm. The thermobonding part 21 (refer FIG. 1) is formed when the thermobonding resin layer 17 which opposes is mutually heat-bonded. The thickness of the heat-adhesive resin layer 17 is preferably about 30 to 40 μm when the content S is a solid, and about 80 to 100 μm when the content S is a liquid. . Further, the thermal adhesive resin layer 17 may be formed of linear low density polyethylene (LLDPE) or low density polyethylene (LDPE).

  The adhesive layer 14 and the adhesive layer 16 are formed of, for example, a polyethylene film having a thickness of about 5 to 30 μm. The base material layer 11 and the intermediate layer 15 are bonded via the adhesive layer 14 by an extrusion method using an extrusion coater (not shown) or the like, and the intermediate layer 15 and the thermoadhesive resin layer 17 are bonded via the adhesive layer 16. Is glued. The base material layer 11, the intermediate layer 15, and the heat-adhesive resin layer 17 may be bonded by a dry laminating method using the adhesive layer 14 and the adhesive layer 16 made of an acrylic adhesive or the like.

  The light absorption layer 13 is formed in a strip-shaped region R1 (see FIG. 1) that overlaps the cut portion 60 of the front surface portion 5 and the cut portion 60 of the back surface portion 6. In addition, the light absorption layer 13 includes a light absorbing material that is highly light-absorbing with respect to laser light in a predetermined wavelength region, and a coloring material that develops color due to heat generated by the light absorbing material due to absorption of the laser light.

  In this embodiment, the light absorption layer 13 is made of laser marking ink, and is printed on the lower surface of the base material layer 11 to have a thickness of about 1 to 5 μm. The light absorbing material of the light absorbing layer 13 includes molybdenum trioxide and titanium oxide, and has an absorption band in the wavelength range (9.2 μm to 10.8 μm) of the carbon dioxide laser beam. Mica or the like may be used as the light absorbing material. Further, as the coloring substance, nitrocellulose, acrylic resin, urethane resin, polyamide resin, chlorinated polypropylene resin, chlorinated rubber, polyester, or a mixture thereof can be used. Moreover, you may use the substance which colors with a laser beam as a light absorption material. In this case, the coloring material may be omitted from the light absorption layer 13.

  The cutting part 60 is formed by irradiating the carbon dioxide laser light on the light absorption layer 13 from the outside of the front face part 5 and the back face part 6 (in the direction of arrow A in FIG. 2). At this time, the laser light reaching the light absorbing layer 13 is absorbed by the light absorbing material of the light absorbing layer 13. For this reason, damage such as penetration of the intermediate layer 15 by laser light is prevented.

  Moreover, since the light absorption layer 13 is provided on the base material layer 11, the heat generated by the light absorption material is hardly transmitted to the intermediate layer 15 by the adhesive layer 14, and damage to the intermediate layer 15 is further prevented. In addition, since the transparent vapor deposition film 15b of the intermediate layer 15 is provided on the lower surface of the transparent resin film 15a, damage to the transparent vapor deposition film 15b due to heat generation of the light absorbing material is prevented.

  Further, the light absorbing material of the light absorbing layer 13 generates heat due to the absorption of the laser light, and the coloring material is colored black, for example. Thereby, the cutting part 60 is formed in black, and the user can visually recognize the cutting part 60 and easily break it.

  When the user breaks the cut portion 60 at the top of the bag body 2 from the notch portion 29, the front surface portion 5 and the back surface portion 6 are broken along the straight portion 62, and the packaging bag 1 is opened. FIG. 3 shows a front view of the packaging bag 1 at this time. When the user grips the upper end portions of the front surface portion 5 and the back surface portion 6 and pulls them away from each other, the chuck member 3 is opened.

  The user can open the chuck member 3 and take out the contents S through the upper surface of the storage portion 4. Further, the user can close the chuck member 3 and easily store the remaining contents S.

  Next, Table 1 shows the evaluation results for the gas barrier properties and the unsealing properties of the packaging bags 1 of the present embodiment and the comparative example.

  As the base material layer 11, the intermediate layer 15, and the thermal adhesive resin layer 17 of each test piece, a biaxially stretched polyester film (trade name: E5102, manufactured by Toyobo Co., Ltd.), a polyethylene terephthalate film (trade name: product name) on which silica is deposited. IB-PET-UBP, manufactured by Dai Nippon Printing Co., Ltd.) and polyethylene film (trade name: A-1, manufactured by Tamapoly Co., Ltd.) were used. And the resin sheet 100 was formed by the extrusion method using the extrusion coater.

  Further, in the packaging bag of the comparative example, instead of the light absorbing layer 13 of the packaging bag 1 of the present embodiment, white pigment ink (trade name: ECOS, The Inktech Co., Ltd.) that does not contain a light absorbing material for carbon dioxide laser light. Used).

  Moreover, the cutting part 60 was formed by irradiating carbon dioxide laser light from the outside of the bag body 2 using a carbon dioxide laser light irradiation device (device name: ML-G9300, manufactured by Keyence Corporation). At this time, the output of the carbon dioxide laser beam irradiation apparatus was varied in the range of 40 to 70% with respect to the maximum output.

  The openability of the packaging bag 1 was evaluated by the feel during the opening operation. The case where the packaging bag 1 could be opened along the cutting part 60 without substantial resistance was indicated by ◯, and the case where the packaging bag 1 could not be opened along the cutting part 60 was indicated by x.

The gas barrier property of the packaging bag 1 was evaluated by water vapor permeability (WVTR) and oxygen permeability. The water vapor transmission rate was measured using a water vapor transmission rate measurement device (device name: PERMATRAN, manufactured by MOCON) in an atmosphere of a temperature of 40 ° C. and a humidity of 90% RH. The oxygen permeability was measured using an oxygen permeability measuring device (device name: OX-TRAN, manufactured by MOCON) in an atmosphere at a temperature of 23 ° C. and a humidity of 90% RH. Compared with the measured values after 1 day from the start of measurement, if the water vapor permeability is 1.5 g / m ² · day or less and the oxygen permeability is 1.5 cc / m ² · day · atm or less In the case where the water vapor permeability is higher than 1.5 g / m ² · day or the oxygen permeability is higher than 1.5 cc / m ² · day · atm, the result is indicated by x.

  According to Table 1, in this embodiment, the unsealing property was high when the laser output was in the range of 40% to 70%. On the other hand, in the comparative example, the unsealing property was high when the laser output was 60% and 70%, but the unsealing property was low when the laser output was 40% and 50%. In the present embodiment, since the damage of the base material layer 11 is larger than that of the comparative example due to heat generated by the absorption of the laser light of the light absorbing layer 13, unlike the comparative example, it is opened even when the laser output is 40% and 50%. It is thought that the nature became high. Further, in this embodiment, a high gas barrier property was exhibited when the laser output was in the range of 40% to 70%, but in the comparative example, the gas barrier property was low when the laser output was 60% and 70%. Accordingly, the provision of the light absorption layer 13 can prevent the gas barrier property of the packaging bag 1 from being lowered.

  According to the present embodiment, the light absorption layer including the light absorption material having high light absorption with respect to the carbon dioxide laser beam between the base material layer 11 and the intermediate layer 15 in the region R1 overlapping the cutting portion 60 made of a half-cut line. 13 is provided. For this reason, when irradiating a laser beam and forming the cutting part 60 in the base material layer 11, a laser beam is absorbed by the light absorption layer 13, and the intermediate | middle layer 15 which has gas-barrier property is prevented from being damaged. Thereby, the packaging bag 1 can be formed transparently and the inside can be visually recognized, ensuring gas barrier property. Therefore, the convenience of the packaging bag 1 can be improved.

  Moreover, since the intermediate layer 15 does not include an aluminum foil as in the conventional example, a metal piece or the like mixed inside the packaging bag 1 can be easily detected by a metal detector.

  The intermediate layer 15 is made of a vapor deposition film of silica or alumina. Thereby, the transparent packaging bag 1 which has gas barrier property is easily realizable.

  Moreover, since the light absorption layer 13 is formed of laser marking ink that develops color by absorbing carbon dioxide laser light, the user can easily see the cut portion 60 and break it easily.

  In addition, the light absorption material of the light absorption layer 13 may have high light absorptivity with respect to laser beams other than a carbon dioxide laser beam. For example, the light absorbing material of the light absorption layer 13 may have high light absorption with respect to YAG laser light, YVO4 laser light, argon ion laser light, semiconductor laser light, and the like.

  However, when the light absorbing material has an absorption band in the wavelength region of the carbon dioxide laser beam as in this embodiment, the cutting portion 60 can be easily formed using a carbon dioxide laser beam irradiation device that is widely used. .

  In addition, since the light absorbing material contains molybdenum trioxide and titanium oxide, high light absorption with respect to carbon dioxide laser light can be easily obtained.

  Moreover, since the light absorption layer 13 is formed in a narrow strip shape overlapping the cutting portion 60, the amount of laser marking ink used can be reduced, and the cost of the packaging bag 1 can be reduced. The light absorption layer 13 may be formed in a region other than the region R1 that overlaps the cutting portion 60.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 4 shows a front view of the packaging bag of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. This embodiment is different from the first embodiment in that a cutting portion 50 is formed in the front surface portion 5 instead of the cutting portion 60. Other parts are the same as those in the first embodiment.

  A cutting portion 50 made of a half cut line extending in the left-right direction is formed above the chuck member 3 of the front surface portion 5. The light absorption layer 13 is formed in a narrow band shape that overlaps the cutting part 50 and the cutting part 60. The cutting part 50 includes an inclined part 51, a straight part 52, an upper curved part 53, and a lower curved part 54. The inclined portion 51 is formed in a V shape along the notch portion 29. The inner end 51 a of the inclined portion 51 is arranged on the inner side than the thermal bonding portion 21.

  The straight portion 52 is formed by extending a predetermined distance in a straight line from the inner end 51 a of the inclined portion 51 toward the center in the left-right direction of the front surface portion 5. The upper curved portion 53 is curved so as to protrude upward, and connects the left and right straight portions 52. The lower curved portion 54 is curved so as to protrude downward, and connects the left and right straight portions 52.

  The inclined portion 51 of the front surface portion 5 and the inclined portion 61 (see FIG. 1) of the back surface portion 6 are formed so as to overlap in front view, and the straight portion 52 of the front surface portion 5 and the straight portion 62 of the back surface portion 6 overlap in front view. Formed. Further, the upper curved portion 53 and the lower curved portion 54 are arranged so as to be shifted upward and downward from the straight portion 62, respectively, and do not overlap with the straight portion 62 in a front view. That is, the cutting part 50 and the cutting part 60 are formed at different positions in the vertical direction at the central part in the horizontal direction.

  When the user breaks the cut portions 50 and 60 at the top of the bag body 2 from the notch portion 29, the packaging bag 1 is opened. At this time, when the user breaks the bag body 2 while applying an upward force from the notch portion 29, the front surface portion 5 is broken along the upper curved portion 53 and the back surface portion 6 is broken along the straight portion 62. . FIG. 5 shows a front view of the packaging bag 1 at this time.

  At this time, the upper curved portion 53 of the front surface portion 5 and the straight portion 62 of the back surface portion 6 are formed at different positions in the vertical direction at the central portion in the left-right direction. Thereby, the level | step difference 56 is formed between the upper end of the front-surface part 5 and the upper end of the back surface part 6 after a fracture | rupture. Therefore, the user can easily grasp the upper end portions of the front surface portion 5 and the back surface portion 6 and pull them away from each other to easily open the chuck member 3.

  When the user breaks the bag body 2 while applying a downward force from the notch portion 29, the front surface portion 5 is broken along the lower curved portion 54, and the back surface portion 6 is broken along the straight portion 62. . FIG. 6 shows a front view of the packaging bag 1 at this time.

  At this time, the lower curved portion 54 of the front surface portion 5 and the straight portion 62 of the back surface portion 6 are formed at different positions in the vertical direction at the center portion in the left-right direction. Thereby, the level | step difference 56 is formed between the upper end of the front-surface part 5 and the upper end of the back surface part 6 after a fracture | rupture. Therefore, the user can easily grasp the upper end portions of the front surface portion 5 and the back surface portion 6 and pull them away from each other to easily open the chuck member 3.

  In this embodiment, the same effect as that of the first embodiment can be obtained. Moreover, the cutting part 50 of the front surface part 5 and the cutting part 60 of the back surface part 6 are formed at different positions in the vertical direction at the central part in the left-right direction. Thereby, the level | step difference 56 is formed between the upper end of the front-surface part 5 after opening, and the upper end of the back surface part 6, and the chuck member 3 can be opened easily. At this time, since the light absorption layer 13 is formed in a narrow strip shape overlapping the cutting portion 50 and the cutting portion 60, the front surface portion 5 and the back surface portion 6 can be formed of the common resin film 100. Therefore, the cost of the packaging bag 1 can be further reduced.

  In addition, the packaging bag 1 of 1st Embodiment and 2nd Embodiment is not limited to a standing pouch, For example, you may form with what is called a four-side seal bag, a three-side seal bag, etc.

  INDUSTRIAL APPLICABILITY The present invention can be used for a packaging bag that is opened by breaking a cut portion made of a half-cut line.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Bag main body 3 Chuck member 4 Storage part 5 Front part 6 Back part 11 Base material layer 12 Print layer 13 Light absorption layer 14, 16 Adhesive layer 15 Intermediate | middle layer 17 Thermal adhesive resin layer 29 Notch part 50, 60 Cutting Part 100 Resin sheet S Contents

Claims (8)

  A packaging bag formed by laminating a transparent resin sheet in which an intermediate layer having a gas barrier property against a predetermined gas is disposed between a base material layer and a heat-adhesive resin layer, and bonding a peripheral edge with the heat-adhesive resin layer And having a cut portion made of a half-cut line formed on each of the substrate layers on the front and back portions facing each other, and having a predetermined gap between the substrate layer and the intermediate layer in a region overlapping the cut portion A packaging bag comprising a light-absorbing layer containing a light-absorbing material having a high light-absorbing property with respect to laser light having a wavelength range of.   The packaging bag according to claim 1, wherein the intermediate layer is made of a deposited film of silica or alumina.   The packaging bag according to claim 1, wherein the light absorption layer is formed of a laser marking ink that absorbs laser light in the wavelength range and develops color.   The packaging bag according to any one of claims 1 to 3, wherein the light absorbing material has an absorption band in a wavelength region of carbon dioxide laser light.   The packaging bag according to claim 4, wherein the light absorbing material includes molybdenum trioxide and titanium oxide.   The packaging bag according to claim 1, wherein the light absorption layer is formed on the base material layer.   The packaging bag according to any one of claims 1 to 6, wherein the light absorption layer is formed in a narrow band shape overlapping the cut portion.   The cutting part of the front part and the cutting part of the back part are arranged at different positions in the vertical direction at the center part in the left-right direction, and the light absorbing layer is the cutting part of the front part and the back part The packaging bag according to any one of claims 1 to 6, wherein the packaging bag is formed in a narrow strip shape overlapping the cut portion.