JP7806476B2 - packaging - Google Patents

Description

The present invention relates to a packaging body.

Conventionally, so-called pillow packages have been used for a variety of purposes. These packages are made by forming a single sheet of packaging material into a cylindrical shape with a gabled back seal, placing contents in the internal space, and sealing the top and bottom. One method for opening a package with this structure is to create an opening start point in the back seal and tear in one direction from that point. For example, in the package disclosed in Patent Document 1, a tear in the packaging material starting from the opening start point in the back seal is captured by opening assistants on both sides of the back seal, and opening proceeds along the opening assistants. This creates an opening suitable for removing the contents.

The packaging disclosed in Patent Document 1 also allows cooked or semi-cooked food to be stored at room temperature, low temperature, or frozen, and is heated in a microwave oven without being opened during cooking. Because the opening aid is made weak against tensile forces, small holes for steam release are formed there as the internal pressure increases during heating, allowing the food to be sufficiently steamed without bursting the packaging.

Patent No. 5948022

The package disclosed in Patent Document 1 has an opening aid provided ahead of the tear's travel direction when opening; the tear joins the opening aid, allowing the package to be opened along the shape of the opening aid. However, in reality, the tear immediately after opening does not spread from the spine seal, and therefore cannot join the opening aid, progressing near the spine seal and failing to create a large opening. Therefore, the object of the present invention is to provide a tear-open package that reliably creates an opening of the expected width.

This package includes a spine seal formed by heat-sealing a pair of substantially parallel opposite ends of a substantially rectangular packaging material in a gabled configuration; end seals formed by heat-sealing the other pair of opposite ends of the packaging material perpendicular to the spine seal; and a body portion enclosing the space defined by the spine seal and end seals. The packaging material is a laminate having a base material layer and a heat-sealable resin layer. The spine seal and body portion are provided with a pair of opening guide portions on both sides of the gable of the spine seal, as viewed from the center. The opening guide portions include an opening initiation portion at the edge of the spine seal portion that serves as the starting point for tearing and opening, a first guide portion that continues from the opening initiation portion and crosses the spine seal and body portion, and a second guide portion that continues from the end point of the first guide portion and extends in the direction of the spine seal portion. The opening guide portions are cut lines that do not penetrate the packaging material.

This package can be opened by following the tear guide from the start point of the back seal to the end point of the tear guide on the body, ensuring an opening of the expected width.

In this package, the opening start portion may have multiple endpoints of the cut line per first guide portion. In this case, even if the opening start portion is misaligned between the edges when the packaging material with the opening guide portion formed therein is heat-sealed to form the spine seal portion, the presence of multiple endpoints of the cut line can reduce the impact of the misalignment.

This package may have a non-sealed portion that is not heat-sealed at the end on the spine seal side, and an opening start portion may also be formed in the non-sealed portion. In this case, even if the opening start portion is misaligned between the edges when the packaging material with the opening guide portion formed is heat-sealed to form the spine seal portion, the lack of heat sealing makes it easier to find a starting point for opening.

The first guide portion may have a portion where the angle between its extension direction and the extension direction of the spine seal portion is 45° to 85°. This increases the reliability of opening the package along the opening guide portion.

The second guide portion may also have a length that does not reach the center of the extension width of the spine seal portion. This makes it less likely that the second guide portion will interfere with the printed design when printing on the body portion.

This packaging may be designed so that a through-hole (hereinafter referred to as a "steaming hole") that penetrates the packaging material in the opening guide section is formed due to an increase in internal pressure of the packaging during microwave cooking. In this case, a steaming hole is properly formed in the opening guide section during microwave cooking, preventing rupture due to an increase in internal pressure and allowing the stored food to be sufficiently steamed.

The heat-sealable resin layer may be made of polyethylene copolymerized with C4 (butene-1) as a comonomer, and the heat-sealable resin layer may have a Young's modulus (tensile modulus) expressed as the slope of the stress-strain line per unit cross-sectional area of 0.2 gigapascals (GPa) or more when measured in accordance with JIS K7127. In this case, the steam vent hole is more likely to be formed properly.

The laminate may have a Young's modulus (tensile modulus), expressed as the slope of the stress-strain line per unit cross-sectional area, of 0.45 gigapascals (GPa) or more when measured in accordance with JIS K7127 for the portion where the opening guide portion is provided.

In this package, the base layer may be a uniaxially stretched nylon film, and the extension direction of the back seal may coincide with the stretch direction of the nylon film. In this case, the pulling direction when opening coincides with the stretch direction of the nylon film, making it easy to tear in that direction.

The opening guidance portion may consist of a continuous line, a dashed line, a dotted line, or a combination thereof formed by laser processing.

The present invention provides a package that can be torn open and that reliably provides an opening of the intended width.

1A is a diagram showing the appearance of a package, and FIG. 1B is a plan view of a packaging material before forming the package of FIG. FIG. 10 is a perspective view of the package in the middle of being opened. FIG. 10 is a perspective view of the package after it has been opened. 1A and 1B are plan views of the packaging material used in the examples. FIG. 10 is a plan view of a packaging material used in a comparative example.

The present invention relates to a pillow-shaped package. This package contains food, and by forming a steam vent in part of the package during microwave cooking, it is possible to prevent rupture due to internal pressure. Furthermore, after cooking, the package can be opened from the opening start section provided in the back seal to easily form an opening with a relatively large opening width in the longitudinal direction of the package, making it easy to remove food and allowing the package to also be used as tableware. Preferred embodiments of the present invention are described in detail below with reference to the drawings. Note that the same or equivalent parts in each drawing are designated by the same reference numerals, and duplicate explanations will be omitted.

As shown in Figure 1, the packaging body 1 of this embodiment is a bag with food sealed inside, and includes a back seal portion 3a formed by heat sealing the backs of the pouches together, two end seal portions 3b, 3c heat sealed perpendicular to the back seal portion 3a, and a body portion 4 enclosing the space defined by the back seal portion 3a and the end seal portions 3b, 3c. Food is contained in this space. The side with and without the back seal portion 3a form the front and back of the packaging body 1, and the portion connecting the two sides forms a gusset corresponding to the thickness of the packaging body 1.

When viewed from the spine seal portion 3a side, the package 1 has a pair of opening guide lines (opening guide lines) 5, 5 arranged symmetrically on both sides of the seam of the spine seal portion 3a, with the base 6 of the spine seal portion 3a as the center line, in the spine seal portion 3a's spine seal portion 3a. Here, the base 6 refers to the boundary between the spine seal portion 3a and the body portion 4. When viewed from the spine seal portion 3a side, the opening guide lines 5, 5 are located within the range from the base 6 to a position where they do not wrap around to the back of the body portion 4 (here, just before reaching the gusset of the body portion 4). Details of the opening guide lines 5, 5 will be described later.

Here, packaging material 100, which is the constituent material of package 1, is a rectangular resin sheet made of a laminate of resin films. Before package 1 is formed, packaging material 100 has a band-shaped heat-sealed portion 3 along its entire peripheral edge. That is, heat-sealed portion 3 extends around the entire periphery of the rectangle, a predetermined distance from the edge of the rectangle into the interior. However, on the two sides that will become spine seal portion 3a when package 1 is formed, non-sealed portions 2, 2 are provided a predetermined distance from the edge. In Figure 1(B), the front surface on which opening guide lines 5, 5 are provided is the outer surface of package 1, and the back surface is the inner surface of package 1. The heat-sealed portion 3 is on the back surface. In Figure 1(B), a pair of parallel ends of packaging material 100, extending in the left-right direction and the up-down direction, are heat-sealed together in a palm-to-palm fashion to form spine seal portion 3a.

The laminate that makes up the packaging material 100 includes at least a base layer and a heat-sealable resin layer. The heat-sealable resin layer is laminated as the innermost layer of the packaging body 1. An adhesive or a printed layer that bonds the base layer and the heat-sealable resin layer may be provided between them. Other layers that may be provided include a gas barrier layer, a light-blocking layer, and an ultraviolet absorbing layer.

The film that makes up the base layer is typically a stretched film such as polyethylene terephthalate resin film, stretched polypropylene resin film, or stretched nylon film, taking into account suitability for printing. A uniaxially stretched film is preferred from the perspective of ensuring that the tear is straight when torn open. The uniaxial stretching direction of the uniaxially stretched film preferably coincides with the extension direction of the back seal portion 3a of the package 1. The thickness of the base layer is, for example, 10 μm to 30 μm.

Polyolefin resins such as polyethylene resin and polypropylene resin are commonly used as the heat-sealable resin layer (sealant). Among polyethylene resins, low-density polyethylene and linear low-density polyethylene are preferred. In the case of the package 1 of this embodiment, linear low-density polyethylene copolymerized with C4 (butene-1) as a comonomer using a Ziegler-Natta catalyst is particularly preferred. This polyethylene is easy to tear by hand, and when heated in a microwave oven, the opening guide lines 5, 5 partially rupture and open, easily forming a steam vent hole that functions as a steam release port. The heat-sealable resin layer may be formed by melting the resin and extruding it onto the substrate layer, or by laminating a film formed from the resin.

In this embodiment, the heat-sealable resin layer has a Young's modulus (tensile modulus) expressed as the slope of the stress-strain line per unit cross-sectional area of 0.2 gigapascals (GPa) or more when measured in accordance with JIS K7127. This Young's modulus may be 0.3 gigapascals or more, or 0.4 gigapascals or more. If the Young's modulus is within this range, the heat-sealable resin layer is less likely to stretch, making it more likely that a steam vent will form when heated in a microwave oven.

The thickness of the heat seal resin layer may be, for example, 10 μm to 50 μm, or 20 μm to 40 μm.

Furthermore, it is preferable that the Young's modulus (tensile modulus) of the laminate, expressed as the slope of the stress-strain line per unit cross-sectional area, is 0.45 gigapascals (GPa) or more when measured in accordance with JIS K7127. For this measurement, a sample with an opening guide line 5 formed is prepared, and this is used as the measurement subject, and pulled at two locations straddling the opening guide line 5 (two locations in a direction perpendicular to the stretching direction of the cut line described below). If the Young's modulus value is 0.45 gigapascals or more, it is easy to balance the stretching of the laminate due to internal pressure (enough to withstand rupture of the package 1) and the formation of the steam vent when heated in a microwave oven.

The opening guide lines 5, 5 are score lines that are cut deep enough so as not to penetrate the packaging material 100. In this embodiment, each opening guide line 5, 5 consists of three sections. Each opening guide line 5, 5 has an opening start section 5a located near the end seal section 3b in the non-sealed sections 2, 2 at the edge of the back seal section 3a; a first guide section 5b that continues from the opening start section 5a and linearly crosses the back seal section 3a and the body section 4; and a second guide section 5c that continues from the end point of the first guide section 5b and extends in the direction of the back seal section 3a and toward the end seal section 3c.

Here, the opening start portion 5a is the starting point for tearing open. It is on an extension of the straight line formed by the first guide portion 5b. The connection point of the first guide portion 5b with the second guide portion 5c is closer to the end seal portion 3c than the connection point with the opening start portion 5a. In other words, the crossing of the spine seal portion 3a from the opening start portion 5a toward the body portion 4 proceeds at an angle toward the end seal portion 3c, and this angle is maintained as the crossing of the body portion 4 continues, resulting in the first guide portion 5b as a whole being linear. Furthermore, the end point of the second guide portion 5c is located short of the center of the extension width of the spine seal portion 3a.

The angle θ between the direction in which the straight line formed by the first guide portion 5b extends and the direction in which the spine seal portion 3a extends is preferably between 45° and 85°. This angle θ may also be between 50° and 80°, or between 55° and 75°.

The depth of the cuts in the opening guide lines 5, 5 can be such that the relevant portions are more fragile than the other portions, and can be so deep that they do not penetrate the packaging material 100 (a so-called "half cut"). For example, they may be formed so that a layer other than the heat-sealable resin layer is cut. Such cut lines can be formed using a blade such as a die cutter or rotary die cutter, or a laser processing machine such as a carbon dioxide laser. When laser processing is used, the material is melted based on the line width of the laser, resulting in a wide cut line. The width of the cut line formed by melting the material is, for example, 50 to 300 μm, preferably 100 to 250 μm. The width of the cut line may also be 10 μm to 100 μm, or 30 μm to 70 μm.

The packaging 1 can heat and steam food stored inside using microwave cooking. Normally, when a sealed package is heated, the internal pressure increases and the package bursts. However, in the packaging 1 of this embodiment, when the internal pressure increases and the package expands, tension is applied to the entire body 4. This causes the opening guide lines 5, 5, which are vulnerable to tensile stress, to partially rupture, forming a steam vent. Steam is released from the steam vent, reducing the internal pressure and preventing the packaging 1 from bursting, while allowing the food to be steamed using the steam that fills the interior.

To open package 1, first, spine seal 3a, which has fallen over, is raised. Next, both sides of spine seal 3a at opening start points 5a, 5a are pinched with the fingers and pulled toward end seal 3c, initiating tearing of package 1. When tearing begins at opening start points 5a, 5a, tear 9 travels down spine seal 3a toward body 4 along first guide point 5b, reaches base 6, then splits into two at base 6, and continues to travel, forming opening 11 (Figure 2). As tearing continues, tear 9 is guided from first guide points 5b, 5b to second guide points 5c, 5c, and reaches the end of second guide points 5c, 5c. If the tear continues toward the end seal 3c, the tear 9 progresses linearly in the area where the opening guide lines 5, 5 are not present, forming a larger opening 11 (Figure 3). This makes it easier to remove the food 13. Furthermore, because the opening 11 is large enough, the packaging material can also serve as a serving dish, eliminating the need to transfer the food 13 to another serving dish.

During this series of microwave cooking and opening processes, the Young's modulus of the heat-sealable resin layer of the packaging material that makes up package 1 is 0.2 gigapascals (GPa) or greater, ensuring that a steam vent is properly formed. With packaging materials used in conventional packages, the highly hygroscopic nylon film base weakens the support for the heat-sealable resin layer in the areas where the opening guide lines 5, 5 are located, causing the heat-sealable resin layer to stretch, making it difficult to form a steam vent. However, with package 1 of this embodiment, a steam vent is properly formed even if the uniaxially oriented nylon film absorbs moisture.

When opening the package, it is necessary to pinch the edges of the non-sealed portions 2, 2, where the opening initiation portions 5a, 5a are located. However, in some cases, when the packaging material 100 is heat-sealed to form the spine seal portion 3a, the edges of the opening initiation portions 5a, 5a may be misaligned. In the package 1 of this embodiment, the edges are non-sealed portions 2, 2, making it easier to find an opening point even if they are misaligned. After tearing begins, the first guide portion 5b is continuous between the spine seal portion 3a and the body portion 4, so that when the tear 9 branches from the base portion 6 and advances, the tear 9 does not deviate from the first guide portion 5b. Furthermore, because the first guide portion 5b is inclined at an angle θ toward the tearing direction (toward the end seal portion 3c), the tear 9 easily advances in the direction widening the opening 11. Additionally, the base layer of the packaging material is made of uniaxially oriented nylon film, and the stretching direction coincides with the tearing direction, making it easy to tear in a straight line even after guidance along the opening guide lines 5, 5 has been completed.

While preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in the above embodiment, the opening start portion 5a formed in the non-sealed portion 2 is a single cut line that is an extension of the first guide portion 5b. However, the opening start portion 5a may have multiple cut line endpoints per first guide portion 5b, as in the packaging material 200 shown in Figure 4(A). In this case, even if misalignment occurs during the formation of the cut line or the heat sealing that forms the back seal portion 3a, it is expected that one of the cut line endpoints of the opposing non-sealed portions 2, 2 will be close to each other, thereby minimizing the adverse effects of misalignment. Furthermore, the length of the second guide portion 5c in the packaging material 200 is longer than that in the packaging material 100.

In addition, in the above embodiment, the first guide portion 5b is shown as a configuration in which the portion present in the spine seal portion 3a and the portion present in the body portion 4 form the same straight line. However, as in the packaging material 300 shown in Figure 4(B), the portion present in the spine seal portion 3a and the portion present in the body portion 4 may not form the same straight line. In the packaging material 300, the portion of the first guide portion 5b present in the spine seal portion 3a extends in a direction perpendicular to the spine seal portion 3a. Note that the shape of the opening start portion 5a in the packaging material 300 is the same as that in Figure 4(A).

In addition, while the above embodiment illustrates a package with a gusset in the body, it may also be a package without a gusset. Furthermore, while the opening guide line in the above embodiment is a continuous line, it may also be a curved line, and may be not only a continuous line but also a dashed line, a dotted line, or a combination of these. Furthermore, while the above embodiment illustrates a form in which the opening start portion is a score line that does not penetrate the packaging material, the opening start portion may also be a notch that penetrates the packaging material. Note that the packaging material 400 shown in Figure 5 does not relate to an embodiment of the present invention.

The present invention will be explained in more detail below using examples and comparative examples. Note that the present invention is not limited to the following examples.

<Materials used>
(Base material layer)
- Uniaxially stretched nylon film: Uniaxially stretched nylon film. Product name: "Uniathlon", manufactured by Idemitsu Unitech Co., Ltd. Thickness: 15 μm.
- Uniaxially stretched PET film: Uniaxially stretched polyethylene terephthalate film. Product name: "Emblet PC", manufactured by Unitika Ltd. Thickness: 12 μm.

(Heat-sealable resin layer)
A linear low density polyethylene copolymerized with C4 (butene-1) as a comonomer using a Ziegler-Natta catalyst was used.
・LLDPE (KF101)
Linear low-density polyethylene. Product name "KF101", manufactured by Sky Film Co., Ltd. Thickness: 40 μm, 60 μm. Young's modulus: 0.40 GPa.
・LLDPE (KF201)
Linear low-density polyethylene. Product name "KF201", manufactured by Sky Film Co., Ltd. Thickness: 40 μm. Young's modulus: 0.22 GPa.
・LLDPE (XMTN)
Linear low-density polyethylene. Product name "XMTN", manufactured by Futamura Chemical Co., Ltd. Thickness: 40 μm. Young's modulus: 0.16 GPa.
・LLDPE (HR611)
Linear low-density polyethylene. Product name "HR611", manufactured by Sky Film Co., Ltd. Thickness: 40 μm. Young's modulus: 0.17 GPa.

Example 1
(Preparation of laminate)
A uniaxially oriented nylon film serving as a substrate layer was printed using the ink "Riogran" (trade name, manufactured by Toyo Ink Co., Ltd.) and a heat-sealable resin layer "LLDPE (KF101)" was attached to the printed surface using adhesives "Takelac A626" (trade name, manufactured by Mitsui Chemicals, Inc.) and "Takenate A50" (trade name, manufactured by Mitsui Chemicals, Inc.) to prepare a laminate.

(Measurement of Young's modulus of laminate)
The laminate was prepared as a sample for measuring Young's modulus. A carbon dioxide laser (output 25 W, scan speed 800 mm/s) was irradiated from the uniaxially oriented nylon film side in the TD direction to form a weakened line (opening guide line) that did not penetrate the heat-sealable resin layer. The sample was cut to a width of 15 mm so that the MD direction was the longitudinal direction, and the weakened part was positioned in the center of the test piece and pulled at a chuck distance of 50 mm and a pulling speed of 200 m/min, and the Young's modulus was calculated (in accordance with JIS K 7127).

(Formation of packaging body)
A carbon dioxide laser was irradiated from the base layer side (output: 25 W, scan speed: 800 mm/sec) to form an opening guide line that did not penetrate the heat-sealable resin layer, resulting in the shape shown in Figure 1(B). The area was 50 mm in the vertical direction and 70 mm in the horizontal direction. 200 g of frozen fried rice was filled inside, and each end was heat-sealed to form the shape shown in Figure 1(A), resulting in a package. The size of the package was 155 mm x 250 mm x 20 mm.

<Examples 2 to 7 and Comparative Example 1>
A package was produced in the same manner as in Example 1 using the materials shown in Table 1. The appearance of the packaging material used is shown in Figures 4(A), 4(B), and 5 in addition to Figure 1(B). Reference numeral 7 in Figure 5 indicates that a notch will be provided there when the package is made.

(Microwave cooking and steam permeability evaluation)
The packages of Examples 1 to 7 and Comparative Example 1 were heated in a microwave oven at 1000 W for 3 minutes. The steam permeability of each package during microwave cooking was confirmed. If a steam vent was formed and steam escaped normally, the package was rated "good," and if steam did not escape or the bag broke in a part other than the opening guide line, the package was rated "poor."

(Evaluation of openability)
The packages of Examples 1 to 7 and Comparative Example 1 that had been cooked in a microwave oven were torn from the opening start portion and opened. Regarding the tearing condition along the opening guide line, if the package could be opened along the shape of the opening guide line, it was rated as "good." In Comparative Example 1, the tear did not reach the opening guide line and instead tore along a portion close to the back seal, so it was rated as "poor." Furthermore, regarding the tearing condition after the end of the opening guide line, if the package could be torn in a straight line, it was rated as "good," and if the package could not be torn in a straight line, it was rated as "poor."

The results shown in Table 1 indicate that tearing along the tear guide line is possible when using the packaging materials shown in Figures 1(B), 4(A), and 4(B). It was also found that a uniaxial nylon film is suitable as the base material for the packaging material to ensure good tearing beyond the end of the tear guide line. It was also found that a Young's modulus of 0.22 GPa or higher for the heat-sealable resin layer is desirable for good vapor permeability.

The present invention can be used for packaging for microwave cooking.

1...packaging body, 2...non-sealed portion, 3...portion to be heat-sealed, 3a...back seal portion, 3b, 3c...end seal portion, 4...body portion, 5...opening guide line (opening guide portion), 5a...opening start portion, 5b...first guide portion, 5c...second guide portion, 6...base portion, 7...portion to become notch (opening start portion), 9...tear, 11...opening, 13...food, 100, 200, 300, 400...packaging material.

Claims (10)

A package comprising: a back seal portion formed by heat-sealing a pair of substantially parallel opposite ends of a substantially rectangular packaging material in a palm-to-palm configuration; end seal portions formed by heat-sealing another pair of opposite ends of the packaging material perpendicular to the back seal portion; and a body portion surrounding a space defined by the back seal portion and the end seal portions,
the packaging material is a laminate having a base material layer and a heat-sealable resin layer,
The spine seal portion and the body portion are provided with a pair of opening guide portions on both sides of the joint of the spine seal portion, as seen from the center,
The opening guide portion has an opening start portion that is a starting point for tearing and opening at the edge of the back seal portion side, a first guide portion that continues from the opening start portion and crosses the back seal portion and the body portion, and a second guide portion that continues from the end point of the first guide portion and extends in the extension direction of the back seal portion,
The opening guide portion is a cut line provided so as not to penetrate the packaging material,
The second guide portion has a length that does not reach a position corresponding to the center of the extending width of the spine seal portion . The package of claim 1, wherein the opening start portion has multiple endpoints of the cut line per first guide portion. The back seal side has an unsealed portion that is not heat-sealed at the end thereof,
The package according to claim 1 or 2, wherein the opening start portion is formed in the non-sealed portion. The package according to any one of claims 1 to 3, wherein the first guide portion has a portion where the angle between its extension direction and the extension direction of the spine seal portion is between 45° and 85°. 5. The package according to claim 1, wherein a through hole penetrating the packaging material is formed in the opening guide portion due to an increase in internal pressure of the package during microwave cooking. the heat-sealable resin layer is made of polyethylene copolymerized with C4 (butene-1) as a comonomer,
The package according to any one of claims 1 to 5, wherein the heat-sealable resin layer has a Young's modulus (tensile modulus) expressed as the slope of a stress-strain line per unit cross-sectional area of 0.2 gigapascals (GPa) or more when measured in accordance with JIS K7127. The package according to any one of claims 1 to 6, wherein the laminate has a Young's modulus (tensile modulus) expressed as the slope of a stress-strain line per unit cross-sectional area of 0.45 gigapascals (GPa) or more in a portion where the opening guide portion is provided, as measured in accordance with JIS K7127. the substrate layer is a uniaxially stretched nylon film,
The package according to any one of claims 1 to 7 , wherein the extending direction of the back seal portion coincides with the stretching direction of the nylon film. The package according to any one of claims 1 to 8 , wherein the opening guide portion is formed by laser processing and is a continuous line, a broken line, a dotted line, or a combination thereof. A package comprising: a back seal portion formed by heat-sealing a pair of substantially parallel opposite ends of a substantially rectangular packaging material in a palm-to-palm configuration; end seal portions formed by heat-sealing another pair of opposite ends of the packaging material perpendicular to the back seal portion; and a body portion surrounding a space defined by the back seal portion and the end seal portions,
the packaging material is a laminate having a base material layer and a heat-sealable resin layer,
The spine seal portion and the body portion are provided with a pair of opening guide portions on both sides of the joint of the spine seal portion, as seen from the center,
The opening guide portion has an opening start portion that is a starting point for tearing and opening at the edge of the back seal portion side, a first guide portion that continues from the opening start portion and crosses the back seal portion and the body portion, and a second guide portion that continues from the end point of the first guide portion and extends in the extension direction of the back seal portion,
The opening guide portion is a cut line provided so as not to penetrate the packaging material,
The second guide portion has a length that does not reach a position corresponding to the center of the extension width of the spine seal portion,
the substrate layer is a uniaxially stretched film,
The extending direction of the back seal portion coincides with the stretching direction of the film,
The packaging body, wherein the opening guide portion is a continuous line, a broken line, a dotted line, or a combination thereof formed by laser processing.