JP2012131524A - Packaging bag, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag linearly openable in its circumferential direction from an opening notch of the packaging bag in opening it, excelling in processing suitability and distribution suitability, and capable of keeping the strength of a packaging material, in a packaging bag where a packaging material is formed of a laminated body of at least an outer layer material such as a stretched film and an inner layer material having a heat-sealable resin layer in the innermost layer.SOLUTION: The packaging bag has a tubular structure composed by forming a back-pasted sealing portion by thermally bonding, in a form of praying palms, both side ends of a packaging material formed of a laminated body having a heat-sealing resin layer in the innermost layer, and sealing a bottom part and a top part. The packaging bag includes an opening notch located at a predetermined part of the back-pasted sealing portion and an opening guidance line for guiding tear of the packaging bag nearly in the horizontal direction, wherein the vertical rupture strength of the packaging material is not less than 5 N/15 mm in measurement by JIS K-7161.

Description

  TECHNICAL FIELD The present invention relates to a packaging bag, and in particular, in a packaging bag formed by sealing both sides of a soft packaging material film into a tubular shape by back-sealing in a palm shape and sealing a bottom and a top portion, an opening provided at the back-sealing seal portion The present invention relates to an easily openable packaging bag that can be opened in a horizontal direction from a position and that can secure a packaging material strength required during a bag making process or distribution, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a packaging bag formed by sealing a soft packaging material into a bag body has been used for various applications including food and toiletries. There are various types of packaging bags, but the most common shapes include pillow type and gusset type. These packaging bags are sealed by overlapping both side ends of the vertically slit packaging material in the shape of a palm, forming a back-sealed seal portion, and then forming a cylindrical shape, then sealing the bottom and top Complete.

  To open these packaging bags, provide a notch for opening, such as making the top or bottom cut blade a serrated blade, and open the bag so as to tear it in the flow direction of the packaging material, Any opening method is generally used in which a notch for opening is provided and the bag is opened so as to tear in the horizontal direction.

  When it is torn vertically, it can be opened from the notch along the flow direction of the packaging material, but depending on the shape of the contents, the opening line is bent and sufficient opening to take out the contents cannot be obtained. The problem arises that the contents are deformed by the stress at the time of opening and cannot be removed cleanly.

  When tearing sideways, when trying to open the so-called hat opening, it is difficult to cut from tearing the packaging material horizontally from the both sides of the notch against the eyes of the packaging material, the sealant extends from the tear and the opening strength increases, The right and left tears are not aligned and the hat part cannot be cut out of the main body.

  On the other hand, by laminating films such as horizontal uniaxial OPP and horizontal uniaxial HDPE that help to open straight in the horizontal direction with respect to the flow direction of the packaging material, the tear of the packaging material is guided in the horizontal direction, and the opening strength is stabilized. However, the left and right tears do not necessarily match, and the tear is curved by being affected by the stress applied during opening and the three-dimensional shape of the contents. In particular, HDPE is prone to fluff due to PE elongation around the rift, and is discouraged from the application to carry it directly to the mouth. And when the above-mentioned laminated structure is employ | adopted, with use of a special film, there exists a problem that packaging material cost increases and versatility falls.

  In order to solve the above-mentioned problem, the packaging bag of patent document 1 is proposed. Specifically, it has a continuous opening guide line that induces tearing by laser processing, the horizontal guide line extends in the horizontal direction, and the guide rises from both ends to the height including the notch for opening the back-sealed seal part It is a packaging bag with line ends.

  When the packaging bag described in Patent Document 1 is opened in the lateral direction from the notch for opening provided in the back-sealed seal portion, when the opening tear intersects with the end portion of the main opening guide line, it is guided along the opening line, By being guided to the end and center, the tear can be opened cleanly along the guide line without bending, and the right and left tears can be met on the guide line to ensure that the cap part is removed from the trunk. This is a technology that can be separated.

However, the packaging material described in Patent Document 1 has the following problems. That is, the opening guide line is a step of forming an opening guide line by a laser processing method on a printed original packaging material,
It is formed through many processes such as slitting to a predetermined width, wrapping the contents while forming a back-sealed seal, and sealing with an opening notch, and in each process there is tension in the flow direction. When it is hung, the opening guide line portion is stretched by tension, which causes a pinhole in the opening guide line portion, and further barrier properties are lowered. In addition, the packaging material is bent due to the elongation of the central portion of the packaging material, the packaging material size is changed, and wrinkles and dents are generated in the central portion of the packaging material for winding.

  In addition, it is self-evident that if the opening guide line is not provided at a certain depth to the laminate, the follow-up property of the tear line cannot be obtained. When the film and the thermoplastic sealant resin have a two-layer structure, the depth of the above-described opening guide line cannot be obtained unless the depth of the stretched film layer is penetrated, but the opening is guided to the above depth. When the process for providing the line is performed by laser processing, the adjacent thermoplastic sealant layer is thermally damaged by the heat energy for sublimating the stretched film, and the above-described problems are more likely to occur. Even with a multilayer structure of two or more layers, the same problem arises depending on the material and thickness of the layer to be cut off in the opening guide wire.

  In particular, when pattern printing is applied to the back side of the outer layer, depending on the pigment and resin composition that make up the ink, decomposition gas is generated by absorbing the energy of the laser, and the laminate around the unsealing guide line becomes floating. As a result, the following suitability of the guide wire is greatly lowered, and there arises a problem that the opening suitability cannot be obtained.

Japanese Patent Application No. 2010-082325

  The present invention is intended to solve the above-mentioned problems, and the packaging material is a packaging bag made of a laminate of at least an outer layer material such as a stretched film and an inner layer material having a heat-sealable resin layer as the innermost layer. Another object of the present invention is to provide a packaging bag that can be opened linearly with respect to the circumferential direction from the opening notch and that can maintain a packaging material strength excellent in processability and distribution suitability.

  This invention is for solving the said subject, and the invention which concerns on Claim 1 of this invention makes the both-sides edge part of the packaging material which consists of a laminated body which has a heat-sealable resin layer in an innermost layer into a palm shape. A packaging bag having a cylindrical structure formed by thermally bonding to form a back-sealed seal portion and sealing the bottom and top, and a notch for opening that triggers opening at a predetermined portion of the back-sealed seal portion; The packaging bag has an opening guide line for inducing tearing of the packaging bag in a substantially horizontal direction, and the packaging material has a breaking strength in the vertical direction of 5 N / 15 mm or more as measured by JIS K-7161. It is a bag.

  The invention according to claim 2 of the present invention is characterized in that the tearing strength along the opening guide line of the packaging material is 0.01N to 2N as measured by JIS K-7125 C method. 1. The packaging bag according to 1.

  The invention according to claim 3 of the present invention is the packaging bag according to claim 1 or 2, wherein the opening guide line has an opening guide line uncut portion at a substantially central position facing the back-sealed seal portion. is there.

  The invention according to claim 4 of the present invention is characterized in that the heat-sealable resin layer is composed of a resin having a melting point of 110 ° C. or higher. It is a bag.

  The invention according to claim 5 of the present invention is characterized in that the unsealing guide wire is formed by a laser processing method, and the unsealing portion of the unsealing guide wire is only the innermost heat-sealable resin layer. Item 5. A packaging bag according to any one of Items 1 to 4.

  In the invention according to claim 6 of the present invention, the outer layer material of the laminate is provided with an ink layer having a thickness of 1 μm or more comprising a urethane resin and a pigment, and the opening guide wire intersecting the region where the ink layer is provided. 6. The packaging bag according to claim 1, wherein the region is 30% or less of the total length of the opening guide line.

  The invention according to claim 7 of the present invention includes a step of forming an opening guide line by laser processing on a printed packaging material, a step of slitting the printed packaging material to a predetermined width, It is a manufacturing method of the packaging bag of any one of Claims 1-6 including the process of forming a seal part and providing an opening notch.

  The packaging bag according to the present invention has an opening guide line that induces tearing in the circumferential direction of the packaging bag at the center in the width direction of the packaging material, and does not bend in the other direction. The tear strength due to the elongation of the sealant layer) does not become excessive, and it is possible to perform a beautiful opening along the guide line with an appropriate strength.

It is the schematic diagram which showed the external appearance of one Embodiment of the packaging bag concerning this invention. It is the schematic diagram which showed the state which opened the packaging bag shown in FIG. It is a plane schematic diagram of the packaging material before bag making of the packaging bag shown in FIG. It is the schematic diagram which showed the state which formed the opening guide line in the printed wide raw fabric.

  Hereinafter, the packaging bag according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an appearance of an embodiment of a packaging bag according to the present invention, and FIG. 2 is a schematic diagram showing a state where the packaging bag shown in FIG. 1 is opened. 3 is a schematic plan view of the packaging material before making the packaging bag shown in FIG. 1, and FIG. 4 is a schematic diagram showing a state in which an opening guide line is formed on the printed wide original fabric. .

  The packaging bag 1 of the present invention is a packaging material 2 composed of a laminate of at least an outer layer and an innermost sealant layer.

  Since the outer layer is a basic material constituting the packaging bag 1, for example, a polyester-based, polyamide-based, polypropylene-based, polycarbonate-based, or polyacetal-based synthetic resin film can be used. Since the synthetic resin film used as the outer layer is generally often printed on the surface on the inner layer side, printability is required. For this reason, as a synthetic resin film used as an outer layer, the stretched film extended | stretched to the biaxial direction is preferable.

The thickness of the outer layer film may be any thickness as long as it can be kept to the minimum necessary for strength, rigidity, etc. as a basic material, and about 12 to 25 μm is appropriate. Further, by using a film on which an inorganic vapor deposition layer such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, and zirconium oxide is formed as the film, barrier properties can be imparted. Furthermore, for the purpose of improving easy cutability, cellophane, a polyester film with good hand cutting properties, or the like may be used.

  Next, as the sealant layer used as the innermost layer, for example, a low density polyethylene resin, a medium density polyethylene resin, a high density polyethylene resin, a linear (linear) low density polyethylene resin, a polypropylene resin, and ethylene-vinyl acetate are used. Polymer resin, ionomer resin, ethylene-acrylic acid copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene-methacrylic acid copolymer resin, ethylene-propylene copolymer resin Can be fused. These may be used alone or in combination of two or more, and a resin and a sheet obtained by forming them into a film may be used. As thickness, 15-100 micrometers is desirable and 30-50 micrometers is more preferable.

  In the present invention, an intermediate layer may be provided between the outer layer and the innermost layer. For example, metal foil such as aluminum, iron, copper, tin, or polyethylene terephthalate resin, polyamide resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-propylene copolymer resin, ethylene -It is possible to use a film such as a saponified vinyl acetate copolymer or a polyvinylidene chloride resin, or a film obtained by depositing an inorganic substance such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide or zirconium oxide. These may be used alone or in combination of two or more. By providing these films in the intermediate layer, gas barrier properties, water vapor barrier properties, mechanical strength, bending resistance, puncture resistance, impact resistance, wear resistance, cold resistance, heat resistance, chemical resistance, etc. It becomes possible to improve.

  Below, the method for forming the opening guide wire 6 is demonstrated.

  A packaging bag 1 according to the present invention forms a back-sealed seal portion 3 by laminating both side ends of a packaging material 2 whose innermost layer is a sealant layer in the shape of a palm, and seals the bottom portion and the top portion to each bottom seal. It is a packaging bag having a cylindrical structure formed by forming a portion 4 and a top seal portion 5. The packaging bag 1 has an opening notch 7 that triggers opening at a predetermined portion of the back-sealed seal portion 3, and opens the packaging material 2 in the center in the width direction of the packaging material 2 to induce tearing in the circumferential direction of the packaging bag 1. It has a guide wire 6. The unsealing guide wire 6 includes a horizontal guide wire 6a and an end guide wire 6b that extends from both ends thereof toward a side end portion of the packaging material at a predetermined angle.

  The horizontal guide wire 6a is provided with an unopened guide wire uncut portion 6 'at a substantially central portion on the extended line. Further, the end guide wire 6 b has a tip 6 c that is 1 mm or more inside from the side end 9 of the packaging material 2. Furthermore, the opening notch 7 is a packaging bag characterized in that it exists in a range of a height h from the lowest point 6e to the highest point 6f of the opening guide line 6 when the packaging material 2 is made vertical.

  When the packaging bag 1 according to the present invention is opened, the tear of the packaging material 2 starting from the opening notch 7 reaches the end guide line 6b, and thereafter proceeds along the end guide line 6b and the horizontal guide line 6a. Therefore, the opening operation is easy and stable, and the cut surface of the opening surface is clean. When cutting the top of the packaging bag where the contents do not exist when cutting the so-called hat-opening by cutting the packaging bag in the circumferential direction in this way, it should be opened neatly using a tool such as a bag. However, it is difficult to open the upper part of the packaging bag containing the slender contents with a tool such as a bag if the upper part of the packaging bag containing the elongated contents is to be cut so that the head of the stored goods is exposed. The packaging bag 1 according to the present invention can be easily and stably opened by such hat cutting, and can be stably produced even in its manufacturing process. .

As shown in FIG. 3, the unsealing guide wire 6 provided at the center in the width direction of the packaging material 2 is composed of a horizontal guide wire 6a and an end guide wire 6b, and the end guide wire 6b is a horizontal guide wire. From both ends of the line 6a, it is directed toward the side end of the packaging material at a predetermined angle. The tip 6c of the end guide wire is 1 mm or more inside from the side end 9 of the packaging material 2.

  If the unsealing guide line 6 reaches the side edge 9 of the packaging material 2, when the web is over tensioned, an accident occurs in which the web breaks starting from the unsealing guide line 6. there is a possibility. However, if the opening guide line margin 6d is 1 mm or more, the problem that the web breaks along the opening guide line 6 due to the tension applied to the web in the stage of the web state in which the packaging material 2 is connected in the longitudinal direction is unlikely to occur. Become. When the unsealing guide line margin 6d is less than 1 mm, the unsealing guide lines are collectively formed on a wide raw fabric, and the slit position contacts the unsealing guide line when slitting between adjacent unsealing guide lines. It is not preferable because the risk increases.

  Next, the opening notch 7 will be described. The opening notch 7 is characterized in that it exists in a range of a height h from the lowest point 6e to the highest point 6f of the opening guide line 6 when the packaging material 2 is made vertical. Since the normal opening notch 7 is provided after the side edges of the packaging material 2 are back-sealed to form the back-sealed seal portion 3, it is shown as the planned opening notch position 7a in FIG. In the embodiment of FIG. 3, the unsealing guide line 6 is composed of a horizontal guide line 6 a and end guide lines 6 b at both left and right ends extending downward from the horizontal guide line 6 a. The leading end 6c of the line, and the opening guide line uppermost point 6f coincides with the horizontal guide line 6a.

  Since the opening notch 7 exists in the range of the opening guide line height h, at the stage of opening the packaging bag, the tear of the packaging material starting from the opening notch 7 reaches the end guide line 6b. After that, it runs from the end guide wire 6b to the opening guide wire 6a. As a result, the opening operation is smoothly performed, and the cut end of the packaging bag after opening is also clean.

  The actual opening notch 7 varies slightly from the expected opening notch position 7a, but the expected opening notch position 7a is set at a position where this variation is expected, and the opening guide line height h is set to By making it larger than the width, it becomes possible to fit the opening notch 7 within the range of the opening guide line height h. The variation in the position of the normal opening notch 7 is about plus or minus 1 mm in the vertical direction. The opening notch 7 may be any of I notch, U notch, V notch and the like.

  Next, as shown in FIG. 3, an angle θ between the line drawn horizontally from the tip of the opening notch 7 (the opening notch planned position 7 a in the figure) and the end guide line 6 b when the packaging material is made vertical. By setting the angle to 10 ° or more and 80 ° or less, the tear of the packaging material starting from the unsealing notch 7 reaches the end guide wire 6b more reliably, and the tear becomes easy to run along the unsealing guide wire 6. A more preferable value of the angle θ is 20 ° or more and less than 70 °, and most preferably 40 ° or more and less than 65 °.

  As shown in FIG. 3, in this embodiment, the tip 6 c of the end guide wire reaches the back-seal-scheduled portion 3 a and is finally in a position to be taken into the back-seal seal 3. . When the end 6c of the end guide wire reaches the back-sealed seal portion 3, the tear of the packaging material starting from the unsealing notch 7 reaches the end guide wire 6b more reliably and reaches the unsealing guide wire 6 A tear can easily run along.

  Further, if the breaking strength in the vertical direction including the opening guide line of the packaging material is 5 N / 15 mm or more, the strength in the flow direction of the packaging material is maintained, and the packaging material starts from the opening line during the manufacturing process and use. It can be produced and used while maintaining stable physical properties without causing breakage, pinholes, reduced barrier properties, and local elongation. When the breaking strength is less than 5 N / 15 mm, there arises a problem that suitability for post-processing cannot be obtained, for example, a breakage occurs due to a tension during bag making.

  Moreover, if the tear strength along the opening guide line of the packaging material is 0.01N to 2N as measured by the JIS K-7125 C method, the tear strength does not bend in the other direction and is due to the elongation of the sealant layer. It is possible to perform a beautiful opening along the guide wire with an appropriate strength without becoming excessive. When the tear strength exceeds 2N, there arises a problem that the actual opening line cannot be guided to the opening guide line. If it is less than 0.01 N, problems such as post-processing suitability and distribution suitability arise.

  In addition, by providing the opening guide wire uncut portion 6 'at the substantially center position facing the back adhesive seal portion of the opening guide wire, the strength of the packaging material, in particular, the center portion of the guide wire is maintained, and the packaging material is a manufacturing process and used. It can be manufactured and used while maintaining stable physical properties without causing breakage, pinholes, reduced barrier properties, and local elongation starting from the opening guide line.

  The meaning of disposing the unsealed guide wire uncut portion 6 'in the center portion of the guide wire is that when the unsealed guide wire uncut portion 6' is provided in the middle of the tear guide when opening from the opening notch of the back-sealed seal portion, the guide wire It will come off. On the other hand, since it is not necessary to guide the cut at the final opening point, the unsealed guide line uncut portion 6 ′ is arranged at a substantially central portion on the extension line of the unwrap guide line. However, when the cap part is cut from the packaging material body, an isosceles triangle-shaped uncut piece with the width of the uncut opening portion provided at the final opening point remains in the packaging material body. In the case of a stick-shaped food that is eaten close to the door, a defect such as a piece of the uncut portion of the unsealing guide wire entering the mouth occurs. For this reason, the width of the unsealed guide wire uncut portion 6 'is 15 mm or less, preferably 5 mm or less.

  Further, in forming the opening guide line by laser processing (ablation) of the outer layer on the packaging bag 1 made of a laminate in which the packaging material 2 has at least an outer layer and a sealant layer as the innermost layer, only the innermost layer is particularly formed. By cutting off, the cutting property at the time of opening is improved.

  However, leaving only the innermost layer causes a problem that the sealant layer adjacent to the outer layer is thermally damaged and the strength of the opening guide line portion is lowered. For this problem, the use of a resin having a melting point of 110 ° C. or higher as the innermost sealant layer can reduce thermal damage and improve the strength reduction of the opening guide line portion. .

  In the configuration in which a metal layer such as aluminum is laminated on the innermost sealant layer, since the metal layer reflects laser light, the innermost sealant layer is not subject to thermal damage. There is no restriction, and those having heat sealability suitable for processing can be used.

Further, in forming the opening guide line by a laser processing method, depending on the pigment or resin composition contained in the ink, CO ₂ gas is generated due to sublimation of the ink component during laser absorption, and the laminate portion around the guide line As a result, the suitability of the guide wire is greatly reduced. Regarding the amount of gas generated, the above-mentioned problem occurs particularly in an urethane layer that easily absorbs the wavelength of the CO ₂ laser and an ink layer that includes a carbon black pigment that easily absorbs heat energy and contains a large amount of carbon. On the other hand, the suitability is improved by limiting the opening guide line intersecting the ink lamination region to 30% or less of the total length. When the total length of the opening guide line intersecting the ink lamination region exceeds 30%, a problem of inadequate induction occurs. About this intersecting length ratio, it is desirable that the ink lamination area such as solid printing should not be concentrated in one place and intersecting the guide line, but the fine ink lamination area is distributed over the whole area like an endless pattern Is desirable. More preferably, the ratio of the intersecting length is 10% or less.

  The main component expressed here is to contain 50% or more in the ink layer weight%, and particularly in the concealing white ink containing 50% or more of the pigment%, the heat resistance of the titanium oxide used as the inorganic pigment. Because of its high properties, sublimation gas is unlikely to be generated, and there is no limitation on the length of intersection between the guide wire and the ink layer.

  Hereinafter, the present invention will be described more specifically with reference to examples.

<Example 1>
A biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm and a width of 720 mm was subjected to gravure printing using black ink having a black pigment content of 20% so that the crossing ratio was 10%. The product pitch of the pattern was 175 mm. Thereafter, the printed surface of the PET film and unstretched polypropylene (CPP) having a thickness of 20 μm, a width of 720 mm, and a melting point of 120 ° C. are laminated by a dry lamination method via a dry laminate adhesive A616 (manufactured by Mitsui Chemicals). A packaging material was obtained.

  Next, the packaging material was formed by using a carbon dioxide laser processing machine in the width direction, as shown in FIG. 4, and by providing an uncut opening guide wire uncut portion having a width of 5 mm in the substantially central portion. Then, the slit process was given so that it might become 140 mm width. The details of the opening guide line are as shown in FIG.

Next, a pillow packaging bag as shown in FIG. 1 having a width of the back-sealed seal portion of 10 mm and a top-and-bottom size of 175 mm is produced, and a horizontal guide wire and end extending substantially horizontally in the width direction with respect to the pillow Between the tip of the guide wire,
That is, an I notch for opening the opening was provided so as to be positioned within the range of the opening guide line height.

<Example 2>
A biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm and a width of 720 mm was subjected to gravure printing using white ink having a white pigment content of 40% so that the crossing ratio was 60%. Thereafter, the printed surface of the PET film and non-stretched polypropylene (CPP) having a thickness of 30 μm, a width of 720 mm, and a melting point of 120 ° C. are laminated by a dry lamination method via a dry laminate adhesive A616 (manufactured by Mitsui Chemicals). A packaging material was obtained.

  Next, the above packaging material was carried out using a carbon dioxide laser processing machine in the width direction, except that an opening guide line was formed as shown in FIG. A pillow packaging bag was produced in the same manner as in Example 1.

<Example 3>
A dry laminate adhesive A616 (Mitsui Chemicals Co., Ltd.) was formed by using a biaxially stretched polyamide (Ny) film having a thickness of 15 μm and a width of 720 mm and a biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm and a width of 720 mm subjected to aluminum deposition. To obtain an outer layer material by a dry lamination method.

  Next, the PET side of the outer layer material and a linear low density polyethylene (LLDPE) film having a thickness of 100 μm, a width of 720 mm, and a melting point of 110 ° C. are dried via a dry laminate adhesive A616 (Mitsui Chemicals). Lamination was used to obtain a packaging material.

Next, the above packaging material was carried out using a carbon dioxide laser processing machine in the width direction, except that an opening guide line was formed as shown in FIG. A pillow packaging bag was produced in the same manner as in Example 1.

<Example 4>
A biaxially stretched polyethylene terephthalate (PET) film with a thickness of 12 μm and a width of 720 mm is overlapped 100% using white ink with a white pigment content of 40% and red ink with a content of red pigment of 20%. Gravure printing was applied.

  Next, the printed surface of the PET film and an aluminum foil having a thickness of 12 μm and a width of 720 mm are laminated via a dry laminate adhesive A616 (manufactured by Mitsui Chemicals), and then the aluminum foil surface and a thickness of 30 μm. A low density polyethylene (LDPE) having a width of 720 mm and a melting point of 102 ° C. was laminated via a dry laminate adhesive A616 (manufactured by Mitsui Chemicals) to obtain a packaging material.

  Next, in the width direction using the carbon dioxide laser processing machine for the packaging material, the opening guide wire is formed without the uncut portion at the center as shown in FIG. A packaging bag was produced.

<Comparative Example 1>
A packaging material was obtained in the same manner as in Example 1.

  Next, the opening guide line was formed in the width direction using the carbon dioxide laser processing machine for the said packaging material as shown in FIG. 4 without the uncut part of an opening guide line. Then, the slit process was given so that it might become 140 mm width. The details of the opening guide line are as shown in FIG.

  Next, a pillow packaging bag as shown in FIG. 1 in which the width of the back-sealed seal portion is 10 mm is prepared, and the horizontal guide wire and the end of the end guide wire extending substantially horizontally in the width direction with respect to the pillow. An I-notch for opening the opening was provided so as to be positioned between the opening guide line heights.

<Comparative example 2>
A biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm and a width of 720 mm was subjected to gravure printing using black ink having a black pigment content of 20% so that the crossing ratio was 10%. Thereafter, dry lamination of the printed surface of the PET film and a linear low density polyethylene (LLDPE) film having a thickness of 30 μm, a width of 720 mm, and a melting point of 100 ° C. via a dry laminate adhesive A616 (manufactured by Mitsui Chemicals). Lamination was performed to obtain a packaging material.

  Next, the above packaging material was carried out using a carbon dioxide laser processing machine in the width direction, except that an opening guide wire was formed as shown in FIG. A pillow packaging bag was produced in the same manner as in Example 1.

<Comparative Example 3>
Except for the biaxially stretched polyethylene terephthalate (PET) film having a thickness of 12 μm and a width of 720 mm, using black ink having a black pigment content of 20% and performing gravure printing so that the crossing ratio is 50%, A pillow packaging bag was produced in the same manner as in Example 1.

<Comparative example 4>
A biaxially stretched polyethylene terephthalate (PET) film with a thickness of 12 μm and a width of 720 mm is overlapped 100% using white ink with a white pigment content of 40% and red ink with a content of red pigment of 20%. Gravure printing was applied.

Next, a printed surface of the PET film and an aluminum foil having a thickness of 12 μm and a width of 720 mm,
Laminate via dry laminate adhesive A616 (Mitsui Chemicals), and then dry laminate the aluminum foil surface and a linear low density polyethylene (LLDPE) film having a thickness of 30 μm, a width of 720 mm, and a melting point of 100 ° C. It laminated | stacked through adhesive agent A616 (made by Mitsui Chemicals), and obtained the packaging material.

  Next, the pillow packaging is performed in the same manner as in Example 1 except that the opening guide line is formed in the width direction using the carbon dioxide laser processing machine in the packaging material as shown in FIG. 4 without the uncut portion of the opening guide line. A bag was made.

<Evaluation of packaging bags>
For the pillow packaging bags obtained in Examples 1 to 4 and Comparative Examples 1 to 4, the breaking strength, tear strength, appearance of the opening induction wire processed portion and opening suitability were measured and evaluated by the following methods, and the results were shown. It was shown in 1.

  [Measurement of Breaking Strength] JIS K-7161

  [Measurement of Tear Strength] JIS K-7125

[Appearance evaluation of unsealed guide wire processing section]
Pinhole: Apply a pinhole check solution to the lead wire processing section and check for liquid seepage.
○ Judgment is made with no exudation and with x exudation.
Pitch elongation: Measure the length per product pitch before bag making.
○ is evaluated and judged within 175 mm ± 1 mm, and x is other than ± 1 mm.

[Evaluation of openability]: Open the pillow packaging bag from the I-notch (I-shaped cut),
○ is opened along the opening guide line, and × is greatly deviated from the opening guide line.

<Comparison result>
The comparative results of the examples and comparative examples will be described below.
The example products obtained in Examples 1 to 4 showed better results in the appearance of the opening induction wire processed part and the opening suitability evaluation than the comparative example products obtained in Comparative Examples 1 to 4. .

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Packaging material 3 ... Back sticking seal part 3a ... Back sticking seal plan part 4 ... Bottom seal part 5 ... Top seal part 6 ...・ ・ Open guide line 6a ・ ・ Horizontal guide line 6b ・ ・ End guide line 6c ・ ・ Tip of end guide line 6d ・ ・ Open guide line margin 6e ・ ・ Opening guide line lowest point 6f ・ ・ Open guide line top Point 6 ': Unopened guide line uncut portion h: Opening guide line height θ: Angle 7 between the line drawn horizontally from the tip of the opening notch and the end guide line 7 ... Sealing notch 7a ··· Opening notch planned position 8 ··· Packaging material width 9 ··· Packaging material side edge 10 · · · Slit scheduled position 11 · · · Register mark

Claims (7)

  It has a cylindrical structure in which both side ends of a packaging material made of a laminate having a heat-sealable resin layer as the innermost layer are thermally bonded in a palm shape to form a back-sealed seal portion, and the bottom and top are sealed. A packaging bag having a notch for opening at a predetermined portion of the back-sealed seal portion and an opening guide line for inducing tearing of the packaging bag in a substantially horizontal direction, and a vertical direction of the packaging material The packaging bag characterized by having a breaking strength of 5 N / 15 mm or more as measured by JIS K-7161.   2. The packaging bag according to claim 1, wherein a tear strength of the packaging material along the opening guide line is 0.01 N to 2 N as measured by a JIS K-7125 C method.   The packaging bag according to claim 1 or 2, wherein the opening guide line has an unopened guide line uncut portion at a substantially central position facing the back-attached seal portion.   The packaging bag according to any one of claims 1 to 3, wherein the heat-sealable resin layer is composed of a resin having a melting point of 110 ° C or higher.   The said unseal | opening induction line is formed by the laser processing method, and the unseal | opening guide line uncut part is only the heat sealable resin layer of the innermost layer, The any one of Claims 1-4 characterized by the above-mentioned. Packaging bag.   The outer layer material of the laminate is provided with an ink layer made of urethane resin and pigment having a thickness of 1 μm or more, and the region of the opening guide line intersecting the region where the ink layer is provided is the total length of the opening guide line. It is 30% or less, The packaging bag of any one of Claims 1-5 characterized by the above-mentioned.   A process of forming an opening guide line on a printed packaging material by a laser processing method, a process of slitting a printed packaging material to a predetermined width, a process of forming a back-sealed seal and providing an opening notch The manufacturing method of the packaging bag of any one of Claims 1-6 characterized by including at least.