Easy-opening packing bag and opening method thereof

Abstract

To provide a packaging bag which has an excellent concealment property for a packaged article, is easy to open and remove the packaged article, and does not easily damage the packaged article when opening or removing the packaged article, and an opening method thereof.SOLUTION: An easy-opening packaging bag has a vertical seal part formed by sealing both side end parts of a film facing each other, and two horizontal seal parts formed by sealing both end parts in an axial direction of a cylindrical film over a full length, the packaging bag has a storage space formed by these seal parts, an easy-opening part having a large number of fine, elongated scars A penetrating a front surface and a rear surface of the packaging bag is provided at an unsealed side end part of the packaging bag, a longitudinal direction of the scar A is parallel to a lateral direction, an opening guide line which is a liner continuous line of fine, elongated scars B penetrating only a rear surface of the packaging bag is provided over the full length in an axial direction between the side end part having the easy-opening part and the vertical seal part, and the longitudinal direction of the scar B is parallel to the axial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an easy-open packaging bag and a method for opening the same. [Background technology]

[0002] Plastic film is typically used as a packaging material, and the package, in which the contents are placed in a packaging bag and sealed, is constructed by placing the contents in a bag-like object made of packaging material that is sized to fit the shape and size of the contents, and then sealing both ends of the cylindrical object.

[0003] While various shapes of such packaging bags are known, there is a strong demand for packaging bags that are easy to open, that is, that can be opened by hand without using tools such as scissors or a cutter. Known easily-openable packaging bags include those in which a notch or the like is provided at one end of the bag and the bag is torn from that point to open it. Patent Document 1 discloses an easily-openable pouch in a pillow packaging pouch in which a notch or weakened portion is provided adjacent to the base of the seam, making it possible to open the pouch along the seam. It is described that with this easily-openable pouch, even if the contents are approximately the same size as the inside dimensions of the bag and are a thick solid, the pouch can be easily opened and the contents removed without being hindered by the contents and without damaging the contents. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-77090 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of a packaging bag with a notch as described in Patent Document 1, the notch may interfere with a pattern or letters on the surface of the packaging bag, and in the case of a packaging bag with a notch in an unsealed portion, the packaged item contained therein may be visible through the notch, so there is room for further improvement in terms of the appearance (design) of the packaging bag and the concealment of the packaged item. Also, for packaging bags in general, it is strongly desired that opening the packaging bag and removing the packaged item be easy and hassle-free, especially when opening a large number of packaging bags, and further that the packaged item is less likely to be damaged when opening or removing the packaging bag, especially in packaging applications for rare or fragile packaged items.

[0006] In view of the state of the prior art, the problem that the present invention aims to solve is to provide an easy-open packaging bag and a method for opening the same, which has a shape that does not interfere with patterns or letters on the surface, has excellent concealment properties for the packaged contents, is easy to open and remove the packaged contents, and is less likely to damage the packaged contents when opened or removed. [Means for solving the problem]

[0007] The present invention is as follows. [1] a vertical seal portion formed by sealing both side edges of the film against each other; the two lateral seal portions are formed by sealing both ends in the axial direction of the film that has become cylindrical due to the formation of the vertical seal portions along the entire length in the lateral direction perpendicular to the axial direction; having A packaging bag in which a storage space capable of storing an item to be packaged is formed by the vertical seal portion and the two horizontal seal portions, An easy-to-open portion having a large number of fine scars A penetrating the front and rear surfaces of the packaging bag is provided at an unsealed side end of the packaging bag, the scars A have an elongated shape, and the longitudinal direction of the scars A is parallel to the lateral direction, At least one opening guide line, which is a fine scratch B that penetrates only the rear surface of the packaging bag and is provided continuously in a straight line, is provided between the side end portion having the easy-open portion and the vertical seal portion over the entire length in the axial direction, the scratch B has an elongated shape, and the longitudinal direction of the scratch B is parallel to the axial direction. An easily openable packaging bag. [2] The easy-open packaging bag according to [1], wherein the distance between the opening guide line and the vertical seal portion is 0 to 5.0 mm. [3] The easy-open packaging bag according to [1] or [2], wherein the longitudinal length of the scar B is shorter than the longitudinal length of the scar A. [4] The easy-open packaging bag according to any one of [1] to [3], wherein the numerous scratches A are arranged in a staggered pattern. [5] The easy-open packaging bag according to [4], wherein the axial pitch of the scar B is narrower than the lateral pitch of the scar A. [6] A method for opening an easy-open packaging bag according to any one of [1] to [5], A step (1) of tearing both the front and rear surfaces of the packaging bag from the easy-to-open portion in a direction generally parallel to the lateral direction up to or beyond the opening guide line; and (2) tearing only the rear surface of the packaging bag along the opening guide line. The opening method is characterized by the above. Effect of the Invention

[0008] According to the present invention, it is possible to provide an easily-openable packaging bag and a method for opening the same, which have a shape that does not interfere with patterns or letters on the surface, have excellent concealment properties for the packaged contents, are easy to open and remove the packaged contents, and are less likely to cause damage to the packaged contents when opened or removed. [Brief description of the drawings]

[0009] [Figure 1]1A and 1B are schematic diagrams showing an example of an easy-open packaging bag of the present embodiment, both of which are views of the easy-open packaging bag from the rear side. [Diagram 2] 1(a) is a schematic diagram showing the film of Example 1 on which group A of scars and group B of scars are formed, and FIG.1(b) is a schematic diagram showing the package of Example 1 as viewed from the rear side. [Diagram 3] 1(a) is a photograph of a part of the scar group A (easy-to-open portion) of Example 1. FIG. 1(b) is a photograph of the scar A of Example 1. [Figure 4] 1(a) is a photograph of a part of the scar group B (three rows of opening guide lines 5) in Example 1. FIG. 1(b) is a photograph of the scar B in Example 1. [Diagram 5] 1(a) is a schematic diagram showing the film of Example 6 on which group A of scars and group B of scars are formed, and FIG. 1(b) is a schematic diagram showing the package of Example 6 as viewed from the rear side. [Figure 6] 1A is a schematic diagram of a package of Comparative Example 2 in which only a notch for opening is formed, as viewed from the rear side, and FIG. 1B is a schematic diagram of a package of Comparative Example 3 in which a notch for opening and group B of scars (three rows of opening guide lines 5) are formed, as viewed from the rear side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention (hereinafter, referred to as the present embodiment) will be described in detail. Note that the present invention is not limited to the following embodiment, and can be practiced in various modifications within the scope of the gist of the present invention. In this disclosure, the terms "substantially" and "about" mean to include an error of about a few percent that occurs during manufacturing or arrangement. For example, "substantially parallel" does not only mean being completely parallel, but also means including a deviation of a few degrees.

[0011] Hereinafter, the easy-open packaging bag and the method for opening the same of the present embodiment will be described with reference to the drawings. 1(a) and 1(b) are schematic diagrams showing an example of an easy-open packaging bag of the present embodiment, where 1(a) is an example of a pillow-type packaging bag and 1(b) is an example of a three-sided sealed packaging bag. Both 1(a) and 1(b) in FIG. 1 are views of the easy-open packaging bag as seen from the rear side. Hereinafter, the up-down direction shown in Fig. 1 will be described as the longitudinal direction of the packaging bag, the longitudinal direction of the film, or the axial direction of the tubular film, and the left-right direction shown in Fig. 1 will be described as the lateral direction of the packaging bag or the lateral direction of the film.

[0012] [Easy-to-open packaging bag] The easy-open packaging bag 1 of this embodiment (hereinafter simply referred to as "packaging bag 1") has a vertical seal portion 2 formed by sealing both side ends (both horizontal ends) of a film facing each other, and two horizontal seal portions formed by sealing both ends in the axial direction (vertical direction in packaging bag 1) of the film that has become cylindrical by forming the vertical seal portion 2, over the entire length in the horizontal direction (horizontal direction in packaging bag 1) perpendicular to the axial direction of the film. In the easy-open packaging bag 1, a storage space capable of storing a packaged item is formed by the vertical seal portion and the two horizontal seal portions. Furthermore, the easy-open packaging bag 1 of this embodiment has an easy-open portion 4 formed of a large number of fine scars A penetrating both the front and rear surfaces of the packaging bag 1, which is provided at an unsealed side end portion of the packaging bag 1. The scars A have an elongated shape, and the longitudinal direction of the scars A is approximately parallel to the lateral direction of the film. Furthermore, in the easy-open packaging bag 1 of this embodiment, at least one opening guide line 5 (three in Fig. 1(a) and five in Fig. 1(b)) consisting of fine scratches B that are continuously arranged in a straight line penetrating only the rear surface of the packaging bag 1 is provided over the entire axial length between the side end having the easy-open portion 4 and the vertical seal portion 2. The scratches B have an elongated shape, and the longitudinal direction of the scratches B is approximately parallel to the axial direction of the tubular film (the longitudinal direction of the packaging bag 1). The easy-open packaging bag 1 of this embodiment has a shape that does not interfere with patterns or letters on the surface of the packaging bag, has excellent concealment properties for the packaged items, is easy to open and remove the packaged items, and is unlikely to cause damage to the packaged items when opened or removed, making it suitable for packaging rare or fragile packaged items.

[0013] The size of the easy-open packaging bag 1 may be appropriately set depending on the type, size, shape, amount, etc. of the packaged items to be accommodated.

[0014] [[Vertical seal part]] In the easy-open packaging bag 1 of this embodiment, the vertical seal portion is provided substantially parallel to the vertical direction over the entire length of the packaging bag 1 in the vertical direction.

[0015] From the viewpoint of not interfering with patterns, letters, etc. on the surface of the packaging bag, the vertical seal portion 2 is preferably provided on the back side of the packaging bag 1 as shown in Figure 1(a) or on the side end portion of the packaging bag 1 as shown in Figure 1(b). When the vertical seal 2 is provided on the back side of the packaging bag 1, the position is not particularly limited, and may be, for example, near the center of the back side of the packaging bag 1 as shown in Fig. 1(a), or may be closer to one of the side edges. From the viewpoint of ensuring the hanging displayability of the packaging bag, it is preferable that the vertical seal 2 is provided on the back side of the packaging bag 1.

[0016] The width D1 of the vertical seal portion 2 (see FIG. 1) is not particularly limited and may be set appropriately depending on the type, size, shape, and amount of the packaged items to be contained, the overall size of the packaging bag, the required strength, etc., but may be, for example, 1 to 30 mm, 3 to 20 mm, or 5 to 10 mm, as long as sufficient strength is obtained and the pattern, lettering, etc. on the surface of the packaging bag is not easily interfered with. The distance d1 (see FIG. 1) between the vertical seal portion 2 and the side edge of the film is not particularly limited and may not be provided (may be 0 mm), or may be set appropriately depending on the type, size, shape, and amount of the packaged items to be contained, the overall size of the packaging bag, the required strength, etc. Specifically, d1 may be, for example, 0 to 10 mm, 1 to 10 mm, 2 to 7 mm, or 3 to 5 mm.

[0017] [[Horizontal seal part]] In the easy-open packaging bag 1 of this embodiment, the two horizontal seal portions are located at both vertical ends of the packaging bag 1 (both axial ends of the film that has become tubular by forming the vertical seal portions 2) and are arranged approximately parallel to the horizontal direction over the entire horizontal length of the packaging bag 1. Hereinafter, as shown in FIG. 1, of the two horizontal seal portions, the upper horizontal seal portion is referred to as upper horizontal seal portion 3a, and the lower horizontal seal portion is referred to as lower horizontal seal portion 3b.

[0018] The width D2 (see Figure 1) of the lower horizontal seal portion 3b is not particularly limited and may be set appropriately depending on the type, size, shape, and amount of the packaged items to be contained, the overall size of the packaging bag, the required strength, etc., but may be, for example, 1 to 30 mm, 3 to 20 mm, or 5 to 10 mm, as long as sufficient strength is obtained and the width does not interfere with patterns, letters, etc. on the surface of the packaging bag. Further, the distance d2 (see FIG. 1) between the lower horizontal seal portion 3b and the lower end of the film is not particularly limited and may not be provided (may be 0 mm), or may be set appropriately depending on the type, size, shape, and amount of the packaged items to be contained, the overall size of the packaging bag, the required strength, etc. Specifically, d2 may be, for example, 0 to 10 mm, 1 to 10 mm, 2 to 7 mm, or 3 to 5 mm.

[0019] The width D3 (see Figure 1) of the upper horizontal seal portion 3a is not particularly limited and may be set appropriately depending on the type, size, shape, and amount of the packaged items to be contained, the overall size of the packaging bag, the required strength, etc., but may be, for example, 1 to 30 mm, 3 to 20 mm, or 5 to 10 mm, as long as sufficient strength is obtained and the width does not interfere with the patterns, letters, etc. on the surface of the packaging bag. Distance d3 (see FIG. 1) between upper horizontal seal portion 3a and the upper end of the film is not particularly limited and may not be provided (may be 0 mm), or may be set appropriately depending on the type, size, shape, and amount of packaged items to be contained, the overall size of the packaging bag, the required strength, etc. Specifically, d3 may be, for example, 0 to 10 mm, 1 to 10 mm, 2 to 7 mm, or 3 to 5 mm.

[0020] [[Easy opening part]] The easy-open portion 4 is provided with a large number of fine elongated scars A penetrating both the front and rear surfaces of the packaging bag 1, and the longitudinal direction of the scars A is approximately parallel to the lateral direction of the packaging bag 1. Since the easy-open portion 4 has many such scars A (has been easily opened), it can be easily torn with fingers at any position in the easy-open portion 4 without using tools such as scissors or a cutter. Therefore, it is preferable that the easy-open packaging bag 1 of this embodiment is opened from the easy-open portion 4 as the starting point for opening, as described later.

[0021] The easy-open portion 4 is located at an unsealed side end of the packaging bag 1. That is, when the vertical seal portion 2 is located at a side end of the packaging bag 1 as shown in Fig. 1(b), the easy-open portion 4 is provided at the other side end where the vertical seal portion 2 is not provided. Also, when the vertical seal portion 2 is located not at a side end of the packaging bag 1 but on the back side of the packaging bag 1 as shown in Fig. 1(a), the easy-open portion 4 may be provided at only one of the side ends (the left end or the right end) or at both side ends (the left end and the right end). Since the easy-open portion 4 exists only on the side edge of the packaging bag 1 and the scar A is minute, it does not interfere with the pattern or letters on the surface of the packaging bag, and the packaging bag 1 has a good appearance (design). In addition, since the packaged items contained inside are difficult to see, the packaging bag 1 has excellent concealment properties and can be used for the same purposes as packaging bags that have not been subjected to easy-open processing.

[0022] Furthermore, the easy-to-open portion 4 may be provided over the entire side end portion (total vertical length) of the packaging bag 1 as shown in FIG. 1(a), or may be provided over only a portion of the side end portion of the packaging bag 1 (for example, only the upper half of the side end portion, etc.); however, from the viewpoint of being able to tear the side end portion from anywhere, it is preferable that the easy-to-open portion 4 be provided over the entire side end portion of the packaging bag 1 (total vertical length). When the easy-open part 4 is provided only in a part of the side end of the packaging bag 1, the vertical length of the easy-open part 4 is preferably 10% or more and less than 100%, more preferably 20% or more and less than 100%, and even more preferably 30% or more and less than 100%, when the total length of the side end of the packaging bag 1 (total length in the vertical direction of the packaging bag 1) is taken as 100%. In this case, it is preferable to apply printing on the surface of the packaging bag so that the location of the easy-open part 4 is easily recognizable and so as to encourage opening from the easy-open part 4. If a scar A is present in the easy-to-open portion 4 near the boundary between the unsealed portion at the side end of the packaging bag 1 and at least one of the horizontal sealed portions, then by pinching and tearing the unsealed portion and the horizontal sealed portion so that the boundary becomes the starting position for tearing, the horizontal sealed portion acts as a tear guide, making it easier to tear the packaging bag 1 more parallel to the horizontal direction (straighter).Furthermore, this is preferable because the torn bag is less likely to come into contact with the packaged goods when tearing, making it less likely that the packaged goods will be deformed (such as folded) or damaged (such as cuts).

[0023] The width (horizontal length) of the easy-open portion 4 is not particularly limited and may be set appropriately depending on the type, size, shape, amount, required strength, etc. of the packaged items to be contained; however, since it is unlikely to interfere with the patterns, letters, etc. on the surface of the packaging bag, it may be, for example, 1 to 10 mm, 1 to 7 mm, or 1 to 5 mm. The width of the easy-to-open portion 4 refers to the horizontal distance from the left end of the leftmost scar A to the right end of the rightmost scar A.

[0024] The fine scar A provided in the easy-open portion 4 penetrates both the front and rear surfaces of the packaging bag 1. Since the scar A penetrates both the front and rear surfaces of the packaging bag 1, the easy-open portion 4 can be easily torn with the strength of fingers without using a tool such as scissors or a cutter. Incidentally, the phrase "scar A penetrates both the front and rear surfaces of the packaging bag 1" means that at least a part of the scar A penetrates both the front and rear surfaces of the packaging bag 1. That is, as described below, when scar A is made (on a flat film) before the vertical seal portion 2 is formed to make a tubular film, scar A is made in a relative position such that at least a part of the fine scar A on the surface that will become the front surface of the packaging bag 1 and at least a part of the fine scar A on the surface that will become the rear surface of the packaging bag 1 overlap when the packaging bag is made.

[0025] The fine scar A provided in the easy-open portion 4 has an elongated shape and is arranged so that its longitudinal direction is approximately parallel to the horizontal direction (longitudinal direction of the horizontal seal portion) of the packaging bag 1. By arranging the scar A in this manner, the packaging bag 1 can be easily torn from the easy-open portion 4 approximately parallel to the horizontal direction (approximately straight). Both ends of the scar A preferably form an acute angle. If both ends of the scar A form an acute angle, the packaging bag 1 tends to be easily torn from the easy-open portion 4 approximately parallel to the longitudinal direction of the scar A (approximately straight).

[0026] The length of the scar A in the longitudinal direction (i.e., the length in the direction approximately parallel to the lateral direction of the packaging bag 1) d a is preferably 0.1 to 3.0 mm, more preferably 0.2 to 2.0 mm, and further preferably 0.5 to 1.0 mm. When the length da of the scar A is 0.1 mm or more, the packaging bag 1 tends to be easier to tear from the easy-open portion 4. When the length da of the scar A is 3.0 mm or less, the scar A is less noticeable and is less likely to interfere with the pattern, letters, etc. on the surface of the packaging bag, so that the packaging bag 1 tends to have a better appearance (design). In addition, since the packaged items contained inside are less visible, the packaging bag 1 tends to have excellent concealment properties, and can be used for the same purposes as packaging bags that are not subjected to easy-open processing.

[0027] It is preferable that the group of scars A are arranged alternately in a staggered pattern in the direction parallel to the outer edge line (vertical direction), since this makes it easier to tear the easy-open portion 4. When the group of scars A are arranged in a staggered pattern in the vertical direction, this may be set appropriately depending on the length and pitch of the group of scars A, for example, it is preferable that 1 to 11 rows are arranged in a staggered pattern in the vertical direction on one side, more preferably 1 to 7 rows, and even more preferably 1 to 5 rows. The scars A are preferably arranged regularly, and the horizontal pitch is preferably 0.1 to 3.0 mm, more preferably 0.2 to 2.0 mm, and even more preferably 0.3 to 1.0 mm. When the horizontal pitch of the scars A is within the above range, the packaging bag 1 tends to be easily torn substantially parallel to the horizontal direction (substantially straight). In addition, the vertical pitch of the scars A is preferably 0.3 to 5.0 mm, more preferably 0.5 to 3.0 mm, and even more preferably 1.0 to 2.5 mm. When the vertical pitch of the scars A is 0.1 mm or more, the easy-open portion 4 tends to be reliably and stably opened from anywhere, and when it is 3.0 mm or less, the process of providing the scars A is relatively easy, and the outer edge of the packaging bag 1 tends to be able to maintain its shape and strength as a packaging bag.

[0028] At least a portion of the numerous scars A (hereinafter also referred to as "scar group A") is preferably present 0 to 2.0 mm inward (laterally) from the outer edge line of the side end of the packaging bag 1, more preferably 0 to 1.5 mm, and even more preferably 0 to 1.0 mm. Note that the presence of scars A 0 mm inward from the outer edge line of the side end of the packaging bag 1 means that scars A are present in the shape of an outer edge line. When a portion of scar group A is present at a position within the above range, it becomes easier to tear the easy-open portion 4 using those scars A as the starting point for tearing, and they are less likely to interfere with pictures, letters, etc. on the surface of the packaging bag.

[0029] In addition, it is necessary to provide a large number of scars A on the packaging bag 1, and specifically, it is preferable to arrange them so that there is at least one scar A in any 5.0 mm of the vertical length of the easy-open portion 4 within a range of 0 to 2.0 mm from the outer edge line of the side end of the packaging bag 1 to the inside (horizontal direction), more preferably two or more, and even more preferably three or more. In order to ensure that the easy-open portion 4 can be opened reliably and stably from anywhere, when the packaging bag 1 is torn by pinching and twisting the easy-open portion 4 with the thumbs and index fingers of both hands, at least one scar A should be present at any location of the easy-open portion 4 between the left and right fingers. As long as there is at least one scar A between the left and right fingers, the narrower the distance between the fingers, the easier it is to effectively apply force to the scar A and open the packaging bag 1. If there is no scar A between the left and right fingers, the packaging bag 1 cannot be torn even if a twisting force is applied to the fingers, but in that case, the fingers naturally slide and the distance between the left and right fingers widens, and when the scar A is present between the spread fingers, the packaging bag 1 can be torn. In such a case, it has been empirically found that if there is at least one scar A at a distance of 5.0 mm, it feels easy to tear. The number of the scars A is preferably 30 or less at intervals of 5.0 mm, more preferably 20 or less, and even more preferably 15 or less. When the number of the scars A is within the above range, the process of imparting the scars A is relatively easy, and the outer edge of the packaging bag 1 tends to be able to maintain a good shape and strength as a packaging bag.

[0030] [[Opening guidance line]] The opening guide line 5 is a continuous linear scar line of fine, elongated scars B that penetrate only the rear surface of the packaging bag 1, and the longitudinal direction of the scars B is approximately parallel to the vertical direction of the packaging bag 1. The opening guide line 5 is formed by providing such a continuous linear pattern of scars B, so that the packaging bag 1 can be easily torn along the opening guide line 5 by hand and finger strength without using tools such as scissors or a cutter. In addition, since the opening guide line 5 is provided on the rear surface of the packaging bag 1 and the scar B is fine, it is unlikely to interfere with the pattern or characters on the surface of the packaging bag, and the packaging bag 1 has a good appearance (design). In addition, since the packaged items contained inside are difficult to see, the packaging bag 1 has excellent concealment properties and can be used for the same purposes as packaging bags that have not been subjected to easy-open processing.

[0031] The opening guide line 5 is located between the side end portion having the easy-open portion 4 on the rear surface of the packaging bag and the vertical seal portion 2, and is provided over the entire length in the vertical direction. Since the opening guide line 5 is provided over the entire length in the vertical direction, the packaging bag 1 can be torn along the opening guide line 5 in a direction (see arrow (2) in FIG. 1; in the case of FIG. 1, a direction substantially perpendicular to arrow (1)) different from the tearing in the horizontal direction (see arrow (1) in FIG. 1) starting from the easy-open part 4, which makes the opening larger, makes it easy to remove the packaged item, and makes it less likely that the packaged item will be damaged when opening or removing it. Therefore, it is preferable to open the easy-open packaging bag 1 of this embodiment by tearing it in the horizontal direction starting from the easy-open part 4 as described below, and then tearing it in the vertical direction along the opening guide line 5. The angle between the opening guide line 5 and the vertical direction is not particularly limited as long as it is arranged along the entire vertical length, but it is preferable that the opening guide line 5 is approximately parallel to the vertical direction (the angle with the vertical direction is approximately 0 degrees) because this makes it easier to tear along the opening guide line 5 and also makes it easier to leave scar B.

[0032] The position of the opening guide line 5 is not particularly limited as long as it is on the rear surface, but it is preferable that it is provided close to and generally parallel to the vertical seal portion 2 as shown in Fig. 1(a), because the opening force from the easy-open portion 4 is attenuated when it reaches the vertical seal portion 2, and the vertical seal portion 2 acts as a tear guide, making it easier to tear the packaging bag 1 more parallel to the vertical direction (straighter) along the opening guide line 5. The distance d4 between the opening guide line 5 and the vertical seal portion 2 is preferably 0 to 5.0 mm, more preferably 0.5 to 3.0 mm, and even more preferably 1.0 to 2.0 mm. In addition, the distance d4 between the opening guide line 5 and the vertical seal portion 2 means the horizontal distance between the opening guide line 5 that is closest to the vertical seal portion 2 among the opening guide lines 5 and the base of the vertical seal portion 2 on the opening guide line 5 side, as shown in Figure 1(a). When the distance d4 between the opening guide line 5 and the vertical seal portion 2 is within the above range, the number of opening guide lines 5 is preferably 1 to 10, more preferably 2 to 7, and further preferably 3 to 6. In addition, when the position of the opening guide line 5 is not close to the vertical seal portion 2 as shown in FIG. 1(b) (the distance d4 between the opening guide line 5 and the vertical seal portion 2 is not within the above range), the vertical seal portion 2 is less likely to act as a tear guide, so the length in the longitudinal direction of the scar B described later (i.e., the length in the direction approximately parallel to the longitudinal direction of the packaging bag 1) d b It is preferable that the opening guide lines 5 are longer and / or that the number of opening guide lines 5 is greater, because this makes it easier to tear the packaging bag 1 more parallel (straighter) in the vertical direction along the opening guide lines 5. In this case, the number of opening guide lines 5 is preferably 1 to 15, more preferably 3 to 12, and further preferably 5 to 10.

[0033] When there are multiple opening guide lines 5, the distance from the left end of the leftmost opening guide line 5 to the right end of the rightmost opening guide line 5 (the horizontal width of the group of opening guide lines 5) is not particularly limited, but may be, for example, 0.5 to 10.0 mm, 1.0 to 7.0 mm, or 1.5 to 5.0 mm, as long as it is unlikely to interfere with patterns, letters, etc. on the surface of the packaging bag.

[0034] Fine scars B constituting opening guide line 5 penetrate only the rear surface of packaging bag 1. Because scars B penetrate only the rear surface of packaging bag 1, they do not interfere with the pattern or letters on the front surface of the packaging bag, and packaging bag 1 has a good appearance (design). In addition, since the packaged items contained inside are difficult to see, packaging bag 1 has excellent concealment properties and can be used for the same purposes as packaging bags that have not been subjected to easy-open processing.

[0035] The minute scars B are elongated and arranged so that their longitudinal direction is approximately parallel to the vertical direction (the longitudinal direction of the vertical seal portion 2) of the packaging bag 1. By arranging the scars B in this manner, the packaging bag 1 can be easily torn along the opening guide line 5 approximately parallel to the vertical direction (approximately straight). Both ends of the scar B preferably form an acute angle. If both ends of the scar B form an acute angle, the packaging bag 1 tends to be easily torn along the opening guide line 5 substantially parallel to the longitudinal direction (substantially straight).

[0036] The length of the scar B in the longitudinal direction (i.e., the length in the direction approximately parallel to the longitudinal direction of the packaging bag 1) d b The length d of the scar B is preferably 0.02 to 2.0 mm, more preferably 0.05 to 1.0 mm, and further preferably 0.1 to 0.7 mm. b When the length d of the scar B is 0.02 mm or more, the packaging bag 1 tends to be easily torn along the opening guide line 5. b When the scratch B is 2.0 mm or less, the scratch B is less noticeable and is less likely to interfere with the pattern or letters on the surface of the packaging bag, so that the packaging bag 1 tends to have a better appearance (design). In addition, since the packaged item contained inside is less visible, the packaging bag 1 tends to have excellent concealment properties and can be used for the same purposes as the packaging bag 1 that has not been subjected to the easy-open processing. The horizontal pitch of the scars B (i.e., the distance between the opening guide lines 5) is preferably 0.1 to 3.0 mm, more preferably 0.2 to 2.0 mm, and even more preferably 0.3 to 1.0 mm. When the horizontal pitch of the scars B is within the above range, the packaging bag 1 tends to be easily torn approximately parallel to the vertical direction (approximately straight) along the opening guide lines 5. In addition, the vertical pitch of the scars B is preferably 0.05 to 3.0 mm, more preferably 0.1 to 2.0 mm, and even more preferably 0.2 to 1.0 mm. When the vertical pitch of the scars B is within the above range, the packaging bag 1 tends to be easily torn approximately parallel to the vertical direction (approximately straight) along the opening guide lines 5.

[0037] The longitudinal length of scar B, d bis the longitudinal length of scar A, d a It is preferable that the length of the scar B in the longitudinal direction is shorter than d. b is the longitudinal length of scar A, d a If the length is shorter than this, the packaging bag 1 tends to be easily torn in the vertical direction along the opening guide line 5 after being torn in the horizontal direction with the easy-open portion 4 as the opening starting point. The longitudinal length of scar B, d b and the longitudinal length of scar A, d a Difference from d b -d a is preferably −2.98 to −0.08 mm, more preferably −2.0 to −0.1 mm, and further preferably −1.0 to −0.3 mm.

[0038] In addition, the vertical pitch P of the scar B bv is the lateral pitch P of the scar A ah The vertical pitch P of the scar B is preferably smaller than bv is the horizontal pitch P of the scar A ah If the width is narrower than the width of the opening guide line 5, the packaging bag 1 tends to be easily torn in the vertical direction along the opening guide line 5 after being torn in the horizontal direction with the easy-to-open portion 4 as the opening starting point. Vertical pitch P of scar B bv and the longitudinal length P of scar A ah Difference with P bv -P ah is preferably −4.95 to −0.25 mm, more preferably −3.0 to −0.5 mm, and further preferably −2.0 to −1.0 mm.

[0039] [[film]] The film constituting the easy-open packaging bag 1 of this embodiment may be a single-layer film or a laminated film, but is preferably a laminated film including a base film layer and a heat-sealable resin film layer as one of the outermost layers.

[0040] The film used for the heat-sealable resin film layer is not particularly limited, and examples thereof include films of polyolefin-based or modified polyolefin-based resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl methacrylate copolymer, ionically cross-linked olefin copolymer (ionomer), and olefin resin graft-modified with an ethylenically unsaturated carboxylic acid or anhydride thereof, which are polymerized using a catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst; polyamide-based resins with a relatively low melting point or softening point; and polyester-based resins with a relatively low melting point or softening point. The film may be made of a single type of resin, or may be made of two or more types of resins. The thickness of the heat-sealable resin film is not particularly limited and may be appropriately set according to the adhesive strength required depending on the type, size, shape, amount, etc. of the packaged item to be contained, but is preferably 5 μm or more, more preferably 10 μm or more, and even more preferably 15 μm or more, because sufficient adhesive strength is easily obtained. Also, the thickness of the heat-sealable resin film is preferably 100 μm or less, more preferably 70 μm or less, and even more preferably 50 μm or less, because stickiness is unlikely to occur when opening.

[0041] The film used for the base film layer is not particularly limited, but examples thereof include films of polyolefin-based resins such as polypropylene; polyamide-based resins such as nylon 6, nylon 66, nylon 11, and nylon 12; polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, and ethylene terephthalate / isophthalate copolymers; polyvinyl chloride-based resins; polyvinylidene chloride-based resins; and vinyl alcohol-based resins such as ethylene-vinyl alcohol copolymer films. The film may be made of a single type of resin, or may be made of two or more types of resins. These films may be unstretched films or uniaxially or biaxially stretched films. However, biaxially stretched films are preferable because they can be easily torn in two different directions: horizontally (see arrow (1) in Figure 1) starting from the easy-to-open portion 4 as the opening starting point, and vertically (see arrow (2) in Figure 1) along the opening guide line 5. The thickness of the base film is not particularly limited and may be appropriately set depending on the strength required for the type, size, shape, amount, etc. of the packaged items to be accommodated. The thickness of the base film is, for example, preferably 5 to 50 μm, more preferably 10 to 30 μm, and further preferably 12 to 25 μm.

[0042] When the packaging bag 1 is required to have gas barrier properties against water vapor, oxygen, etc., aroma barrier properties, etc., for preserving the packaged item contained in the packaging bag 1, it is preferable to use a laminated film including a gas barrier layer such as a metal foil, a gas barrier resin, or a vapor deposition film to impart gas barrier properties and aroma barrier properties. The film used for the gas barrier layer may be one type alone or a combination of two or more types.

[0043] Examples of the metal foil include various surface-treated steel foils and light metal foils such as aluminum. Examples of the surface-treated steel foil include cold-rolled steel foils that have been subjected to one or more surface treatments such as zinc plating, tin plating, nickel plating, electrolytic chromate treatment, and chromate treatment, and surface-treated steel foils that have been subjected to the above plating treatment prior to final rolling and then cold rolling. Examples of the light metal foil include pure aluminum foil and aluminum alloy foil. The thickness of the metal foil is preferably from 2 to 20 μm, more preferably from 5 to 15 μm, and further preferably from 6 to 12 μm.

[0044] A protective coating may be provided on one surface of the metal foil by a method other than lamination. The protective coating can be formed, for example, by applying a protective paint. Examples of protective coatings include modified epoxy coatings such as phenol-epoxy coatings and amino-epoxy coatings; vinyl or modified vinyl coatings such as vinyl chloride-vinyl acetate copolymers, partially saponified vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate-maleic anhydride copolymers, epoxy modified-vinyl coatings, epoxy amino modified-vinyl coatings, and epoxy phenol modified-vinyl coatings; acrylic resin coatings; and synthetic rubber coatings such as styrene-butadiene copolymers. The protective coating may be of one type alone or a combination of two or more types. The protective coating is applied to the metal foil, for example in the form of an organic solvent solution such as an enamel or lacquer, or in the form of an aqueous dispersion or solution, by roller coating, spray coating, dip coating, electrostatic coating, electrophoretic coating, etc. If the protective coating contains a thermosetting resin, the coating is baked if necessary. From the viewpoints of corrosion resistance and processability, the thickness of the protective coating is preferably 0.01 to 10 μm, more preferably 0.02 to 5 μm, and even more preferably 0.05 to 2 μm in a dry state.

[0045] Examples of gas barrier resins include polyvinylidene chloride resins; ethylene-vinyl alcohol copolymers; and polyamide resins such as nylon 6, nylon 66, nylon 6 / 66 copolymer, metaxylylene adipamide, nylon 610, nylon 11, nylon 12, nylon 13, and hexamethylene terephthalamide / isophthalamide copolymer. The gas barrier resin may be a single type of resin or two or more types of resins. From the viewpoint of protecting the packaged item, the thickness of the gas barrier resin layer is preferably 0.05 to 50 μm, more preferably 0.1 to 25 μm, and even more preferably 0.2 to 15 μm in a dry state.

[0046] Examples of the vapor-deposited film include films in which a metal such as aluminum, a metal oxide, silicon, or the like is vapor-deposited onto a base film.

[0047] Examples of the laminated film include biaxially oriented polypropylene layer / polyolefin resin heat seal layer film, biaxially oriented polypropylene layer / aluminum foil / polyolefin resin heat seal layer film, biaxially oriented polypropylene layer / aluminum vapor-deposited polyolefin resin heat seal layer film, biaxially oriented polypropylene layer / ethylene vinyl alcohol copolymer layer / polyolefin resin heat seal layer film, biaxially oriented polypropylene layer / amorphous aromatic polyamide layer / polyolefin resin heat seal layer film, biaxially oriented nylon layer / polyolefin resin heat seal layer film, biaxially oriented nylon layer / aluminum vapor-deposited polyolefin resin heat seal layer film, biaxially oriented nylon layer / aluminum foil / polyolefin resin heat seal layer film, biaxially oriented nylon layer / ethylene vinyl alcohol copolymer layer / polyolefin resin heat seal layer film, biaxially oriented nylon layer / amorphous aromatic polyamide layer / polyolefin resin heat seal layer film, biaxially oriented polyethylene terephthalate biaxially oriented polyethylene terephthalate layer / polyolefin-based resin heat seal layer film, biaxially oriented polyethylene terephthalate layer / aluminum foil / polyolefin-based resin heat seal layer film, biaxially oriented polyethylene terephthalate layer / aluminum vapor-deposited polyolefin-based resin heat seal layer film, biaxially oriented polyethylene terephthalate layer / ethylene-vinyl alcohol copolymer layer / polyolefin-based resin heat seal layer film, biaxially oriented polyethylene terephthalate layer / amorphous aromatic polyamide layer / polyolefin-based resin heat seal layer film, biaxially oriented polyester layer / polyolefin-based resin heat seal layer film, biaxially oriented polyester layer / aluminum foil / polyolefin-based resin heat seal layer film, biaxially oriented polyester layer / aluminum vapor-deposited polyolefin-based resin heat seal layer film, biaxially oriented polyester layer / ethylene-vinyl alcohol copolymer layer / polyolefin-based resin heat seal layer film, and biaxially oriented polyester layer / amorphous aromatic polyamide layer / polyolefin-based resin heat seal layer film.

[0048] The method for producing the laminated film is not particularly limited, and any conventionally known method can be used, for example, dry lamination, sandwich lamination, extrusion coating, coextrusion, etc. When sufficient adhesion cannot be obtained between the layers, adhesive resins such as urethane adhesives, epoxy adhesives, and acid-modified olefin resin adhesives can be used.

[0049] Sandwich lamination is performed by extruding any resin between films or between a film and a metal foil, and extrusion coating is performed by extruding any resin onto a film or a metal foil. Examples of the resin to be extruded include one or more of the resins constituting the above-mentioned heat-sealable resin film, and blends of these resins with known fillers, and are used as a single layer or co-extrusion. An anchoring agent such as a urethane type or titanate type may be applied to the surface on which the extruded resin layer is applied.

[0050] The thickness of the entire film is not particularly limited and may be set appropriately depending on the strength, characteristics, etc. required for the type, size, shape, amount, etc. of the packaged items to be contained; for example, it is preferably 15 to 200 μm, more preferably 20 to 100 μm, and even more preferably 30 to 75 μm.

[0051] [Easy-to-open packaging] The easy-open packaging body of this embodiment includes the easy-open packaging bag 1 of this embodiment described above, and a packaged item contained in a storage space formed by the vertical seal portion 2 and two horizontal seal portions of the easy-open packaging bag 1. The packaged item accommodated in the easy-open packaging bag 1 is not particularly limited, and examples thereof include various cards (trading cards, etc.), electronic devices, electronic boards, IC tags, and the like. The shape, size, hardness, amount, etc. of the packaged item are not particularly limited and may be appropriately set depending on the type, use, etc. of the packaged item. For example, the packaged item may be approximately the same size as the inner dimensions of the package.

[0052] [Manufacturing method of easy-open packaging bags] The method for producing the easy-open packaging bag 1 of the present embodiment is not particularly limited, but may be, for example, a method including the following steps. Step (a): forming a scar A on a film; Step (b): forming a scar B on the film; Step (c): forming a vertical seal portion 2 by sealing both side edges of the film with the sealing surfaces (heat sealable resin film layers) facing each other; Step (d): forming a lower horizontal seal portion 3b by sealing the axial lower end portion of the film that has become cylindrical by forming the vertical seal portion 2 over the entire length in the horizontal direction; and Step (e): A step of sealing the upper axial end of the film over its entire lateral length to form upper lateral seal portion 3a. The above steps may be performed in the order of steps (a), (b), (c), (d), and (e), or, for example, the formation of the scar A in step (a) may be performed after any of steps (b) to (e). In addition, the formation of the horizontal seal portions in steps (d) and (e) may be performed in either order, or may be performed simultaneously.

[0053] The method of producing the scars A and B on the film in steps (a) and (b) is not particularly limited, and examples thereof include a method of pressing a film between a rotating jig having fine sharp-edged blades with a height of about 0.2 to 1.0 mm and a width of about 0.2 to 1.0 mm on the circumferential surface of a disk or cylinder, which are mechanically arranged in a staggered pattern in multiple rows on the circumferential surface of the disk or cylinder, as disclosed in JP-A-6-8966, and a rotating backing roll; a method of pressing a film between a rotating jig having hard particles (e.g., synthetic diamonds) with a particle size of about 50 to 100 μm and sharp corners electrodeposited on the circumferential surface of a disk or cylinder and a rotating backing roll; and a method of pressing a film between a rotating jig having sandpaper attached to the circumferential surface of a disk or cylinder and a rotating backing roll. For example, when using a jig in which fine blades are arranged on the circumferential surface of a disk or cylinder, in order to make each mark so that the longitudinal direction of mark A and the longitudinal direction of mark B are approximately perpendicular, it is sufficient to use a jig in which the arrangement (orientation) of the blades differs by approximately 90 degrees for mark A and mark B, respectively. Methods for fixing the packaging bag 1 at a fixed position on the above-mentioned receiving roll in order to impart the fine scratches A and the fine scratches B at fixed positions include, for example, a method of providing an adhesive resin layer on the surface of the receiving roll, or a method of making the receiving roll hollow and providing a large number of fine holes penetrating into the inside of the receiving roll on the surface of the receiving roll, and reducing the pressure inside the receiving roll to temporarily fix the packaging bag 1 to the surface of the receiving roll.

[0054] In steps (c), (d) and (e), the methods for forming the vertical seal portion 2, the upper horizontal seal portion 3a and the lower horizontal seal portion 3b, i.e., the method for sealing the film, are not particularly limited, and methods that use heat such as heat sealing, impulse sealing, high frequency sealing, ultrasonic sealing and melt cutting sealing to melt and bond the sealing surface of the film can be used.

[0055] [Method of manufacturing easy-to-open packaging body] The method for producing the easy-open packaging body of the present embodiment is not particularly limited, but may be, for example, a method including the following steps. Step (a): forming a scar A on a film; Step (b): forming a scar B on the film; Step (c): forming a vertical seal portion 2 by sealing both side edges of the film with the sealing surfaces (heat sealable resin film layers) facing each other; Step (d): forming a lower horizontal seal portion 3b by sealing the axial lower end portion of the film that has become cylindrical due to the formation of the vertical seal portion 2 over the entire horizontal length; Step (x): Filling the film with the packaged material from the unsealed upper end in the axial direction of the film on which the lower horizontal seal portion 3b is formed; and Step (e): A step of sealing the upper axial end of the film over its entire lateral length to form upper lateral seal portion 3a. The above steps may be performed in the order of steps (a), (b), (c), (d), (x), and (e), or, for example, step (a) may be performed after any of steps (b) to (d). In addition, the formation of the horizontal seal portions in steps (d) and (e) may be performed in either order, or may be performed simultaneously after filling the package with the packaged material in step (x).

[0056] The method for forming the scar A and the scar B on the film in steps (a) and (b) is not particularly limited, and may be the same as the method described in the above-mentioned [Method for producing an easy-open packaging bag]. Furthermore, in steps (c), (d) and (e), the methods of forming the vertical seal portion 2, the upper horizontal seal portion 3a and the lower horizontal seal portion 3b, i.e., the method of sealing the film, are not particularly limited and may be the same as the method described in the above-mentioned [Method of manufacturing an easy-open packaging bag]. In step (x), the method for filling the packaged items is not particularly limited and may be appropriately selected depending on the type, size, shape, amount, etc. of the packaged items.

[0057] [How to open easy-to-open packaging bags] The method for opening the easy-open packaging bag 1 of this embodiment includes step (1) of tearing both the front and rear surfaces of the packaging bag 1 in a direction approximately parallel to the horizontal direction from the easy-open portion 4 (see arrow (1) in Figure 1) up to or beyond the opening guide line 5, and step (2) of tearing only the rear surface of the packaging bag 1 along the opening guide line 5 in a direction different from step (1) (see arrow (2) in Figure 1; in the case of Figure 1, a direction approximately perpendicular to arrow (1)). The easy-open packaging bag 1 of this embodiment can have a large opening by the above-mentioned opening method, making it easy to remove the packaged item and making it less likely that the packaged item will be damaged when opening or removing the package.

[0058] In step (1), if a scar A is present near the boundary between the unsealed portion of the side end of the packaging bag 1 and at least one of the horizontal seal portions, it is preferable to pinch and tear the unsealed portion and the horizontal seal portion so that the boundary becomes the starting position for tearing, as the horizontal seal portion acts as a tear guide, making it easier to tear the packaging bag 1 more parallel to the horizontal direction (straighter).In addition, the torn bag is less likely to hit the packaged goods when tearing, making it less likely that the packaged goods will be deformed (e.g., folded) or damaged (e.g., cut). In step (2), if the opening guide line 5 is provided adjacent to the vertical seal portion 2 and approximately parallel to the vertical seal portion 2, it is preferable to pinch and tear the vertical seal portion 2 and the torn back surface by pinching the opening guide line 5 between them, because the vertical seal portion 2 acts as a tearing guide and makes it easier to tear the packaging bag 1 more parallel to the vertical direction (straighter) along the opening guide line 5. EXAMPLES

[0059] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0060] The evaluation methods used in the examples and comparative examples are as follows.

[0061] [Concealment of packaged items] The packaged contents of the obtained package were visually inspected, and the concealment ability of the packaged contents was evaluated according to the following evaluation criteria. [Evaluation Criteria] A (Excellent): The packaged item cannot be seen at all. B (Good): Part of the package is visible, but the patterns and letters on the surface of the package cannot be made out. C (poor): Part or all of the packaged item is visible, and patterns or letters on the surface of the packaged item can be distinguished.

[0062] [Easy to open] The packaging bag of the obtained package was opened, and the ease of opening was evaluated according to the following evaluation criteria. [Evaluation Criteria] A (Excellent): The packaging bag can be opened using only the strength of the fingers to the extent that the packaged items can be removed without using any tools (scissors, cutters, etc.), and an opening is secured that allows the packaged items to be removed from the packaging bag. B (Good): The packaging bag can be opened by hand alone to the extent that the packaged items can be removed without using tools (scissors, cutters, etc.), but there is no opening wide enough to remove the packaged items from the packaging bag. C (inferior): The packaging bag cannot be opened enough to remove the packaged items without using tools (scissors, cutter, etc.).

[0063] [Damage or deformation of packaged items] For the resulting package, the packaging bag was opened, the packaged items were removed, and damage to the packaged items was evaluated according to the following evaluation criteria. [Evaluation Criteria] A (Excellent): Neither deformation nor damage occurred to the packaged items. B (Good): The packaged items were not damaged, but there was slight deformation. C (Poor): The packaged item was damaged or significantly deformed.

[0064] The materials and devices used in the examples and comparative examples are as follows.

[0065] [film] OPP / vmCPP laminate film (135mm length x 155mm width): This was produced by bonding a biaxially oriented polypropylene (OPP) film ("FOR" manufactured by Futamura Chemical Co., Ltd.) with a pattern and text printed on the entire surface that will become the outer surface when made into a packaging bag, and a VMCPP (aluminum vapor-deposited non-oriented polypropylene) film ("2703" manufactured by Toray Film Processing Co., Ltd.) together by the dry lamination method using a urethane adhesive.

[0066] [Packaged item] Card (88mm long x 63mm wide x 0.28mm thick, paper card with pictures and text printed on both sides)

[0067] [Rotary roll with blades] Roll A1: A rotating disc-shaped roll on the outer surface of a metal disc with a diameter of 80 mm and a thickness of 5.5 mm, on which are arranged seven rows of sharp, fine protruding blades with a base width of 0.5 mm and a height of 0.45 mm, with the length of the blade perpendicular to the circumferential direction of the disc, so that the pitch in the thickness direction of the disc is 0.5 mm and the pitch in the circumferential direction of the disc is 2.0 mm (the sharpening width of the fine protruding blades is 3.5 mm). Roll B1: A rotating disc-shaped roll having fine protruding blades with sharp tips, each with a base width of 0.3 mm and a height of 0.25 mm or more, arranged in a staggered pattern in three rows on the outer surface of a metal disc with a diameter of 80 mm and a thickness of 3.0 mm, with the length of the blade parallel to the circumferential direction of the disc, and the pitch in the thickness direction of the disc being 1.0 mm and the pitch in the circumferential direction of the disc being 0.45 mm (the sharpening width of the fine protruding blades is 0.3 mm).

[0068] [Example 1] A package containing a card in a packaging bag (pillow-type packaging bag) was produced by the following procedure. Figure 2(a) shows a schematic diagram of the OPP / vmCPP laminate film with scar A and scar B formed, and Figure 2(b) shows a schematic diagram of the package seen from the rear side. A number of scars A (scar group A) penetrating an OPP / vmCPP laminate film (hereinafter simply referred to as the "film") were formed using roll A1. Specifically, the film was sandwiched between roll A1 and a rubber-covered receiving roll that rotates together with roll A1, and the film was pressed by roll A1 and the receiving roll to form band-shaped scars A group 3.5 mm wide over the entire length of the film in the vertical direction. The distance from one end of the film in the horizontal direction (hereinafter referred to as the "left end") to the center of band-shaped scars A group was 44.5 mm. The length of scars A was 0.5 mm, the horizontal pitch was 0.5 mm, and the vertical pitch was 2.0 mm. Figure 3(a) is a photograph of a part of scars A group, and Figure 3(b) is a photograph of scars A. Next, a roll B1 was used to form a number of scars B (scar group B) penetrating the film. Specifically, the film with scar group A formed was sandwiched between roll B1 and a rubber-covered receiving roll that rotates together with roll B1, and the film was pressed by roll B1 and the receiving roll to form three rows of opening guide lines consisting of scar group B over the entire length of the film in the vertical direction. The distance from the left end of the film to the central opening guide line was 17 mm. The length of scar B was 0.3 mm, the horizontal pitch was 1.0 mm, and the vertical pitch was 0.45 mm. Figure 4(a) is a photograph of a part of scar group B (opening guide lines), and Figure 4(b) is a photograph of scar B. Next, the film with the scars A and B (opening guide lines) formed was curved into a cylindrical shape with the vmCPP layer side facing inward, and the sealing surfaces (vmCPP layer side surfaces) of the overlapping side ends of the film were heat sealed to form a vertical seal (5 mm wide). The distance between the vertical seal and the opening guide line was 4.5 mm. The film was folded so that the vertical seal was located in the center of the rear surface of the packaging bag (see the fold in Figure 2(a)), and then the lower vertical end of the film was heat sealed to form a lower horizontal seal (width 5 mm). Five cards were inserted from the open upper end in the vertical direction, and the upper end was then heat-sealed to form an upper horizontal seal part (width 5 mm) to obtain a package. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0069] [Example 2] A package was produced in the same manner as in Example 1, except that the length of the scar A was changed to 1.0 mm. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0070] [Example 3] A package was produced in the same manner as in Example 1, except that the lateral pitch of the scar A was changed to 1.0 mm. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0071] [Example 4] A package was produced in the same manner as in Example 1, except that the length of the scar B was changed to 0.5 mm. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0072] [Example 5] A package was produced in the same manner as in Example 1, except that the lateral pitch of the scars B was changed to 2.0 mm. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0073] [Example 6] A package was produced in the same manner as in Example 1, except that the distance between the vertical seal and the opening guide line was changed to 6.0 mm. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0074] [Example 7] A package was produced in the same manner as in Example 1, except that the position of the vertical seal was changed to be at the side edge of the packaging bag (the shape of the packaging bag was changed to a three-sided sealed type packaging bag) and the number of opening guide lines was changed to six. Figure 5(a) shows a schematic diagram of the film, and Figure 5(b) shows a schematic diagram of the package as viewed from the rear side. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0075] [Example 8] A package was produced in the same manner as in Example 7, except that the length of the scar B was changed to 0.5 mm and the number of rows of the opening guide lines was changed to three. The evaluation results are shown in Table 1. The easy-to-open parts (scar group A) and the opening guide lines (scar group B) did not interfere with the patterns and letters on the surface of the package, and the package had a good appearance (design).

[0076] [Comparative Example 1] A package was produced in the same manner as in Example 1, except that no opening guide line (scratch B) was provided. The evaluation results are shown in Table 1. The easy-to-open portion (scar A) did not interfere with the pattern and letters on the surface of the packaging bag, and the packaging bag had a good appearance (design).

[0077] [Comparative Example 2] A package was produced in the same manner as in Example 1, except that the easy-to-open portion (scar A) and the opening guide line (scar B) were not provided, and a V-notch (cut) for opening was provided by scoring at a position 6.0 mm from the lower end of the upper horizontal seal portion. Figure 6(a) shows a schematic diagram of the package as viewed from the rear side. The results of each evaluation are shown in Table 1. Note that the pattern and characters on the surface of the packaging bag were partially cut off due to the opening notch, and the appearance (design) of the packaging bag was marred.

[0078] [Comparative Example 3] A package was produced in the same manner as in Example 1, except that no easy-to-open portion (scar A) was provided, and a V-notch (cut) for opening was provided by scoring at a position 6.0 mm from the bottom end of the upper horizontal seal portion. Figure 6(b) shows a schematic diagram of the package as viewed from the rear side. The evaluation results are shown in Table 1. Although the opening guide line (scar B) did not interfere with the pattern and letters on the surface of the packaging bag, the pattern and letters on the surface of the packaging bag were partially cut off by the opening notch, and the appearance (design) of the packaging bag was marred.

[0079] [Table 1] [Industrial Applicability]

[0080] The easy-open packaging bag of this embodiment has a shape that does not interfere with surface patterns, letters, etc., has excellent concealment properties for the packaged items, is easy to open and remove the packaged items, and is unlikely to cause damage to the packaged items when opened or removed, and can therefore be suitably used as a packaging bag for various cards (trading cards, etc.), electronic devices, electronic circuit boards, IC tags, etc. [Explanation of symbols]

[0081] 1 packaging bag 2 Vertical seal 3a Upper horizontal seal 3b Lower horizontal seal 4 Easy opening part 5 Opening Guidance Line

Claims

1. a vertical seal portion formed by sealing both side edges of the film against each other; the two lateral seal portions are formed by sealing both ends in the axial direction of the film that has become cylindrical by forming the vertical seal portions along the entire length in the lateral direction perpendicular to the axial direction; having A packaging bag in which a storage space capable of storing an item to be packaged is formed by the vertical seal portion and the two horizontal seal portions, An easy-to-open portion having a large number of fine scratches A penetrating the front and rear surfaces of the packaging bag is provided at an unsealed side end of the packaging bag, the scratches A have an elongated shape, and the longitudinal direction of the scratches A is parallel to the lateral direction, At least one opening guide line, which is a fine scratch B that penetrates only the rear surface of the packaging bag and is provided continuously in a straight line, is provided between the side end portion having the easy-open portion and the vertical seal portion over the entire length in the axial direction, the scratch B has an elongated shape, and the longitudinal direction of the scratch B is parallel to the axial direction. An easily openable packaging bag.

2. The easy-open packaging bag according to claim 1, wherein the distance between the opening guide line and the vertical seal portion is 0 to 5.0 mm.

3. The easy-open packaging bag according to claim 1 or 2, wherein the length of the scar B in the longitudinal direction is shorter than the length of the scar A in the longitudinal direction.

4. 3. The easy-open packaging bag according to claim 1, wherein the numerous scratches A are arranged in a staggered pattern.

5. The easy-open packaging bag according to claim 4 , wherein the axial pitch of the marks B is narrower than the lateral pitch of the marks A.

6. The method for opening the easy-open packaging bag according to claim 1 or 2, A step (1) of tearing both the front and rear surfaces of the packaging bag from the easy-to-open portion in a direction generally parallel to the lateral direction up to or beyond the opening guide line; and (2) tearing only the rear surface of the packaging bag along the opening guide line. The opening method is characterized by the above.

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