JP7243205B2 - packaging bag - Google Patents

Description

To provide a packaging bag which can be easily torn and opened, can be torn and opened at least along the outline of a pattern when being torn and opened, and can impart beauty and design after opening.

BACKGROUND ART Conventionally, various types of packaging bags, such as three-side seal type, four-side seal type, self-supporting type, pillow type, etc., have been sold containing various contents. The packaging bag is usually provided with an unsealing means, an unsealing means, or an unsealing start means and an unsealing means so that the contents can be taken out by tearing with fingers without using a tool such as a pincher. . Examples of means for starting opening include an I-shaped, V-shaped, U-shaped, or hexagonal notch or notch, or a group of scars, etc., provided on the outer edge of the joint at the peripheral edge of the packaging bag. be able to. As an unsealing means, at least one layer of the laminate constituting the packaging bag is left, and it is provided in any layer or a plurality of layers, such as cuts or perforations, or the laminate constituting the packaging bag. For example, a uniaxially stretched film is provided on any layer to impart linear tearability.

The packaging bag provided with the above-mentioned opening start means or opening means can be easily torn open by the opening start means, but the opening is formed by tearing one laminated body and the other laminated body constituting the packaging bag. The opened opening lines are almost flush with each other, and the opening is clean. .

Therefore, the first cut line and the second cut line formed on the front and back laminates of the packaging bag are formed with different shapes and formation positions, and when the laminate is torn and opened, the front and back laminates of the opening are opened. A packaging bag has been proposed in which a step is formed in the line so that the bag can be easily opened (see, for example, Patent Document 1).

According to Patent Document 1, due to the level difference between the opening lines of the laminate on the front and back of the opening, one laminate and the other laminate can be easily picked, the opening operation is simplified, and the contents can be easily taken out, which is convenient for the user. Convenience can be provided. However, although various functions such as the convenience of packaging bags have been proposed, there are almost no packaging bags that pursue beauty and design after opening the packaging bag, and development is desired.

JP 2013-209159 A

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and its object is to provide a packaging bag that can be easily torn and opened, and that can provide cosmetic and design properties after opening. It is in.

In order to achieve the above-mentioned problems, the present invention according to claim 1 provides a pair of opposite left and right side edges in which a front sheet and a back sheet made of a laminate are superimposed and provided with joints on the peripheral edges. Among the edges, one of the side edges is the opening start side, and the other side edge is the opening end side, and the front sheet and the back sheet are torn from the opening start side to the opening end side, left and right. A packaging bag to be opened in a second direction, wherein a pattern is formed on at least one of the front sheet and the back sheet, and at least a laser cut line along the outline of the pattern is provided. .

Further, according to the present invention of claim 2, in the packaging bag of claim 1, the laminate has at least an outer layer and a heat-fusible resin layer, and the heat-fusible resin layers are superimposed on each other. , at least left and right side edge joints are formed at opposing positions of a pair of opposing left and right side edges, a front pattern is formed on the front sheet, and the left and right sides are formed on the front sheet A first laser cut line having a starting point at one side edge joint of the edge joints, an end point at the other side edge joint, and extending from the starting point to the end point, A back pattern is formed on the back sheet, and the back sheet has the starting point at one of the left and right side edge joints and the starting point at the other side edge joint of the left and right side edge joints. A second laser-cut line having the end point and extending from the starting point to the end point is provided, and the formation positions of the first laser-cut line and the second laser-cut line in a plan view state of the laminate are different By doing so, when the front sheet and the back sheet are torn from the starting point side to the ending point side and opened in the left-right direction, the front sheet is torn along the first laser cut line, and the The back sheet is torn along the second laser cut line, and a picture pattern appears in which the front picture and the back picture are synchronously switched.

Further, according to the third aspect of the present invention, in the packaging bag according to the second aspect, the first laser-cut line and the second laser-cut line are mutually opposed at positions on the inner surface of the packaging bag on the lower end side from the second laser-cut line. A fastener made of synthetic resin is provided, comprising a protruding male member and a concave female member that engage with each other, and a resealing function is provided by engaging the male member and the female member. It is.

The packaging bag of the present invention can be easily torn open, and when it is torn open, it is torn open along at least the outline of the pattern, and can provide cosmetic and design properties after opening.

BRIEF DESCRIPTION OF THE DRAWINGS The first embodiment of the packaging bag which concerns on this invention is shown, (a) is a front view, (b) is a rear view. FIG. 2 is a diagram schematically showing a cross section taken along the line XX of FIG. 1; It is an opening view showing the opened state of the packaging bag of the first embodiment of the present invention, (A) is the opened packaging bag, (B) is the front of the cut piece, (C) is the back of the cut piece. . 2nd embodiment of the packaging bag which concerns on this invention is shown, (a) is a front view, (b) is a rear view. FIG. 5 is a view schematically showing a YY line cross section of FIG. 4; It is an opening view showing the opened state of the packaging bag of the second embodiment of the present invention, (A) is a front view of the opened packaging bag, (B) is a rear view of the opened packaging bag, (C) shows a front view of the cut-out. FIG. 3 is a diagram showing a packaging bag according to a third embodiment of the present invention and schematically showing a cross section at a position corresponding to line XX in FIG. 1; FIG. 4 is a cross-sectional view showing a configuration example of a laminate of backing sheets.

The present invention described above will be described in detail below with reference to the drawings and the like.
FIG. 1 shows the first embodiment of the packaging bag according to the present invention, (A) is a front view, (B) is a rear view, and FIG. 3 is an opening view showing the opened state of the packaging bag of the first embodiment of the present invention, FIG. 4 shows the second embodiment of the packaging bag according to the present invention, (A) is a front view, (B) is a back side FIG. 5 is a view schematically showing the YY line cross section of FIG. 4, FIG. 6 is an unsealing view showing the unsealed state of the packaging bag of the second embodiment of the present invention. (b) is a rear view of the opened packaging bag, (c) is a front view of the cut piece, FIG. 7 shows the packaging bag of the third embodiment according to the present invention, and FIG. FIG. 8 is a cross-sectional view schematically showing a cross-section at a position corresponding to line XX, and FIG. 8 is a cross-sectional view showing an example of the structure of a laminated body of backing sheets. 1B' is an opened packaging bag, 2 is a front sheet, 2a is a front picture, 2a' is a front picture layer, 3 is a back sheet, 3a and 3b are back pictures, 3a' and 3b' are back picture layers, 3c is a concealing layer, 4 is a joint, 4y is left and right side edge joints, 4t is an upper and lower edge joint, 5 is a laser cut line, 5a is a first laser cut line, and 5b is a second laser cut line. , 6 is a cut piece, 7 is an opening start means, 8 is a bottom sheet, 10 is a laminate, 11 is an outer layer, 11a is a first base layer, 11b is a second base layer, and 12 is a heat-fusible resin layer. , 13 is an intermediate layer, 20 is a synthetic resin fastener, 21 is a protruding male member, 22 is a concave female member, S is a starting point, and E is an end point.

FIG. 1 shows a first embodiment of a packaging bag according to the present invention, (A) is a front view, (B) is a rear view, and FIG. The packaging bag 1A consists of a laminate 10 in which an outer layer 11 and a heat-fusible resin layer 12 are laminated, and the heat-fusible resin layers 12 of the rectangular front sheet 2 and the back sheet 3 are superimposed on each other, It is a four-sided sealing type packaging bag in which the peripheral edge is thermally bonded and a joint portion 4 is provided on the peripheral edge to seal the bag. In this specification, of the joints 4 provided on the peripheral edge, for example, in FIG. A pair of joints 4 positioned in the vertical direction are called upper and lower edge joints 4t.

As shown in FIG. 1(a), the front sheet 2 is formed with, for example, a watermelon pattern as a front pattern 2a. The first laser cut line 5a of the laser cut lines 5 extending from the starting point S to the end point E has a starting point S at the edge joint portion 4y and an end point E at the other left and right side edge joint portions 4y. The first laser-cut line 5a is formed in a straight line crossing at least the upper part of the watermelon pattern of the front pattern 2a. FIG. 1(b) is a rear view of the packaging bag 1A. The back sheet 3 is formed with a back pattern 3a (not shown), and the back sheet 3 has left and right side edge joints 4y. One of the left and right side edge joints 4 y has a starting point S, the other left and right side edge joints 4 y has an end point E, and the laser cut line 5 extending from the starting point S to the end point E is the second A laser cut line 5b is provided, and the second laser cut line 5b is formed along at least the outline of the pattern of the flesh exposed by cutting the watermelon of the back pattern 3b (see FIG. 3). In the plan view state of the packaging bag 1A, the forming positions of the first laser-cut lines 5a provided on the front sheet 2 and the second laser-cut lines 5b provided on the back sheet 3 are different. The start point S and the end point E of the first laser cut line 5a and the second laser cut line 5b are arranged at the same position, respectively, and the start point S and the end point E are between the outer edge and the inner edge of the opposing left and right side edge joint portions 4y. located in An unsealing starting means 7 is provided on the outer edge of the left and right side edge joints 4y on the extension line of the starting point S and the ending point E, for example, a V notch is provided in FIG. In the packaging bag 1A of the first embodiment, the pattern is formed on the front sheet 2 and the back sheet 3, but the pattern may be formed on at least one of the front sheet 2 and the back sheet 3. Moreover, the unsealing start means 7 may be provided on both the left and right side edge joint portions 4y so that the package can be torn and unsealed from either the left or right side.

FIG. 2 is a view diagrammatically showing a cross-section taken along the line XX of FIG. 1. A packaging bag 1A comprises a front sheet 2 and a back sheet 3 of a laminated body 10 which are superimposed on each other and has a joint portion 4 on the periphery. As shown in FIG. 2, the laminate 10 of the front sheet 2 has at least an outer layer 11 and a heat-fusible resin layer 12 as an inner layer from the outside. are laminated, and a front pattern layer 2a' is formed on the exposed surface of the outer layer 11. As shown in FIG. A first laser cut line 5a is formed on the outer layer 11 through the front pattern layer 2a'. The laminate 10 of the back sheet 3 has at least an outer layer 11 and a heat-fusible resin layer 12 as an inner layer from the outside. A back pattern layer 3a' is formed on the surface of the intermediate layer 13, and a back pattern layer 3b' is formed on the surface of the intermediate layer 13 facing the heat-fusible resin layer 12. The front picture 2a consisting of the layer 2a' of the back sheet 3 and the back picture 3b consisting of the back picture layer 3b' of the back sheet 3 are synchronized. A second laser-cut line 5b is formed on the outer layer 11 through the back pattern layer 3a', and the formation positions of the first laser-cut line 5a and the second laser-cut line 5b are different. . The heat-fusible resin layer 12 of the front sheet 2 and the heat-fusible resin layer 12 of the back sheet 3 are overlapped so as to face each other, and the left and right side edges are placed at opposing positions of a pair of opposing left and right side edges. The packaging bag 1A shown in FIG. 1 is formed by forming edge joints 4y, forming upper and lower edge joints 4t at positions where a pair of opposing upper and lower side edges face each other, and forming joints 4 on the periphery. is obtained. Although FIG. 1 shows a four-sided seal type as an example of the packaging bag 1A, it is not limited to this, and may be a three-sided sealed type, a self-supporting type, or a pillow type. In the case of a pillow type with upper and lower edge joints and a back joint (back seal part), one of the left and right side edges facing each other orthogonally to the back joint is The opening side is the opening start side, and the other side edge is the opening end side.

FIG. 3 is an unsealing diagram showing the unsealed state of the packaging bag 1A of the first embodiment of the present invention, where (a) is the unsealed packaging bag 1A' and (b) is the packaging bag 1A when it is torn open. The front of the cut piece 6 is shown, and (c) shows the back of the cut piece 6. FIG. The action exerted when the packaging bag 1A of the first embodiment is opened will be described with reference to FIGS. 1 and 3. FIG. The front sheet 2 And the back sheet 3 is torn from the side of the starting point S to the side of the terminal point E, for example, in FIG. At the same time, the back sheet 3 is torn along the second laser-cut line 5b provided along the outline of the back design 3b to form the first laser-cut line 5a and the second laser-cut line 5b. converges at the end point E and reaches the outer edge (left side) of the left and right side edge joints 4y, the tearing is completed and the package is unsealed. When the cut piece 6 is removed as shown in FIG. 3(a), the back pattern 3b formed on the intermediate layer 13 of the back sheet 3 is exposed through the heat-fusible resin layer 12. As shown in FIG. At that time, the front pattern 2a of the front sheet 2 and the back pattern 3b of the back sheet 3 are synchronously switched to form a pattern, and excellent cosmeticity and design can be obtained. Then, the user is surprised and shocked by the switched pattern. In FIG. 1, the pattern is the watermelon before it is cut, but as shown in FIG. In addition, since the formation positions of the first laser-cut line 5a of the front sheet 2 and the second laser-cut line 5b of the back sheet 3 are different, they are formed by the first laser-cut line 5a and the second laser-cut line 5b. Since the tear-open line creates a level difference, the front sheet 2 and the back sheet 3 can be easily pinched and opened. FIG. 3(C) shows a rear view of the cut piece 6, but the heat-sealing property of the front sheet 2 is shown in the portion where the back sheet 3 which is torn along the pattern by the second laser cut line 5b is removed. The resin layer 12 is visible.

FIG. 4 shows a second embodiment of a packaging bag according to the present invention, where (a) is a front view, (b) is a rear view, and FIG. The packaging bag 1B consists of a laminate 10 in which an outer layer 11 and a heat-fusible resin layer 12 are laminated. The heat-fusible resin layer of the bottom sheet 8 composed of the laminated body 10 is mountain-folded to the outside, sandwiched between the lower part of the front sheet 2 and the back sheet 3, and the peripheral edge is thermally bonded to provide a joint part 4 at the peripheral edge to seal it. It is a self-supporting type packaging bag.

As shown in FIG. 4(a), the front sheet 2 is formed with, for example, a wild boar character pattern as a front pattern 2a. It has a starting point S at the edge joint portion 4y, an end point E at the other left and right side edge joint portions 4y, and a first laser cut line 5a among the laser cut lines 5 extending from the starting point S to the end point E. , the first laser cut line 5a is formed along at least the contour of the upper part of the wild boar character picture of the front picture 2a. FIG. 4(b) is a rear view of the packaging bag 1B. The back sheet 3 has a back pattern 3a (not shown), and the back sheet 3 has left and right side edge joints 4y. One of the left and right side edge joints 4 y has a starting point S, the other left and right side edge joints 4 y has an end point E, and the laser cut line 5 extending from the starting point S to the end point E is the second A laser cut line 5b is provided, and the second laser cut line 5b is formed in a straight line crossing at least left and right. In the plan view state of the packaging bag 1B, the forming positions of the first laser-cut lines 5a provided on the front sheet 2 and the second laser-cut lines 5b provided on the back sheet 3 are different. The start point S and the end point E of the first laser cut line 5a and the second laser cut line 5b are arranged at the same position, respectively, and the start point S and the end point E are between the outer edge and the inner edge of the opposing left and right side edge joint portions 4y. located in An unsealing starting means 7 is provided at the outer edges of the left and right side edge joints 4y on the extension line of the start point S and the end point E. For example, in FIG. 4, a V notch is provided. V-notches may be provided on both sides. When the laser-cut line 5 is formed along the outline of the front pattern 2a or the back pattern 3b, a gentle curve is preferable. When tangent lines are drawn to the curves on both sides of the inflection point, it is preferable to form an obtuse angle formed by the intersection, and more preferably to form a radius at the inflection point, When the packaging bag is torn open, it can be torn easily and neatly along the laser cut line 5.例文帳に追加

FIG. 5 is a view diagrammatically showing a YY line cross section of FIG. 4. A packaging bag 1B has a front sheet 2 and a back sheet 3 made of a laminate 10 overlaid and has a joint portion 4 at the peripheral edge. As shown in FIG. 5, the laminate 10 of the front sheet 2 has at least an outer layer 11 and a heat-fusible resin layer 12 as an inner layer from the outside. are laminated, and a front pattern layer 2a' is formed on the intermediate layer 13 side of the outer layer 11. As shown in FIG. A first laser cut line 5 a is formed in the outer layer 11 . The laminate 10 of the back sheet 3 has at least an outer layer 11 and a heat-fusible resin layer 12 as an inner layer from the outside. A layer 3a' having a back design is formed on the intermediate layer 13 side. A second laser-cut line 5b is formed in the outer layer 11, and the formation positions of the first laser-cut line 5a and the second laser-cut line 5b are different.

FIG. 6 is an unsealing diagram showing the unsealed state of the packaging bag 1B of the second embodiment of the present invention, where (a) is a front view of the unsealed packaging bag and (b) is a rear view of the unsealed packaging bag. , (C) shows a front view of the cut piece. A state when the packaging bag 1B of the second embodiment is opened will be described with reference to FIGS. 4 and 6. FIG. The packaging bag 1B is opened by the opening starting means 7 at the outer edges of the left and right side edge joints 4y provided with the starting point S and/or the ending point E of the first laser-cut line 5a and the second laser-cut line 5b. And the back sheet 3 is torn from the side of the starting point S to the side of the end point E, for example, when tearing from the right side to the left side in FIG. It is torn along the first laser-cut line 5a provided along the contour, and at the same time, the back sheet 3 is torn linearly along the second laser-cut line 5b to form the first laser-cut line 5a and the second laser-cut line. When the line 5b converges at the end point E and reaches the outer edge (left side) of the left and right side edge joints 4y, tearing is completed and the package is unsealed. When the cut-off piece 6 is removed as shown in FIG. 6(a), the outline of the front design 2a is cut off from the top of the opened packaging bag 1B', completing the wild boar character. The unsealed packaging bag 1B' has excellent cosmetic and design properties. Then, the user is given enjoyment and interest in the pattern completed by the cutting. Furthermore, since the formation positions of the first laser-cut line 5a of the front sheet 2 and the second laser-cut line 5b of the back sheet 3 are different, the first laser-cut line 5a and the second laser-cut line 5b are formed. Since the tear-open line creates a level difference, the front sheet 2 and the back sheet 3 can be easily pinched and opened. FIG. 6(b) shows the back surface of the opened packaging bag 1B', and the heat-fusible resin layer 12 of the front sheet 2 can be seen in the cut portion. A front view of the cut piece 6 is shown in FIG. 6(C). I see 12.

FIG. 7 shows a packaging bag 1C of a third embodiment according to the present invention, and is a view schematically showing a cross section at a position corresponding to line XX in FIG. The packaging bag 1C is provided with a fastener 20 made of synthetic resin at a position facing the inner surface of the packaging bag 1C on the lower end side of the first laser-cut line 5a of the front sheet 2 and the second laser-cut line 5b of the back sheet 3. ing. The synthetic resin engaging tool 20 comprises a protruded male member 21 and a recessed female member 22 which engage with each other. 3 are heat-bonded to the heat-fusible resin layer 12 . The synthetic resin articulating tool 20 can freely engage and disengage the protruding male member 21 and the concave female member 22, and can repeatedly perform the opening function and the resealing function. Other than that, it is the same as the packaging bag 1A of the first embodiment, so the same reference numerals are given and the description is omitted.

Next, the laminate 10 that constitutes the packaging bags 1A, 1B, and 1C will be described. As the outer layer 11 of the laminate 10, a synthetic resin film having excellent mechanical, physical, and chemical properties is used as a base layer because it is a basic material that constitutes the packaging bags 1A, 1B, and 1C. For example, polyester-based, polyamide-based, and polypropylene-based resins can be used. As the film using these resins, a biaxially stretched film is suitable. The reason for this is that the outer layer 11 is usually printed, and thus printability is required. Furthermore, if storage stability is required depending on the contents filled in the packaging bag, stretched films using resins such as polyester, polyamide, and polypropylene are added with inorganic substances such as aluminum oxide and silicon oxide, and aluminum. A vapor-deposited film obtained by vapor-depositing metal can be used. Moreover, the thickness of the film constituting the outer layer 11 is usually about 12 to 40 μm. The base material layer of the outer layer 11 may be composed of two or more base material layers by combining a plurality of the above-described films depending on conditions such as the kind of content and the application.

Further, the heat-fusible resin layer 12 as the inner layer of the laminate 10 may be a layer formed of a heat-bondable resin that can be melted and welded to each other by heat. Polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene and acrylic acid acid copolymers, ester copolymers of ethylene and acrylic acid esters, and the like.

Moreover, the laminate 10 may have an intermediate layer 13 between the outer layer 11 and the heat-fusible resin layer 12 . This intermediate layer 13 is provided when rigidity, light-shielding properties, gas barrier properties, etc. are required when the packaging bag is made. , paper, cellophane, etc. In particular, for example, when backing patterns 3a and 3b are provided on the backing sheet 3, the backing pattern 3b is not visible from the outer surface of the backing sheet 3, only the backing pattern 3a is visible, and the backing pattern 3a is visible from the inner surface of the backing sheet 3. In order to make only the back design 3b visible, a material having concealability is preferable, and aluminum foil is more preferable.

As a method for laminating each layer constituting the laminate 10, a well-known lamination method such as a sandwich lamination method, an extrusion lamination method, a dry lamination method, or the like may be appropriately used for lamination.

In addition, the formation of the first laser cut line 5a and the second laser cut line 5b can be physically formed using a rotary die cutter, but after forming the laminate 10, the outer layer is formed using a pulse oscillation type laser or the like. 11 is preferable. The types of lasers used for this purpose include carbon dioxide lasers, YAG lasers, semiconductor lasers, argon ion lasers, and the like.

FIG. 8 is a cross-sectional view showing a configuration example of the laminate 10 of the backing sheets 3. As shown in FIG. 8(a) and 8(b) show the structure in which the outer layer 11, the intermediate layer 13, and the heat-fusible resin layer 12 are laminated, and FIG. It is a structure in which an outer layer 11 in which two layers of a material layer 11b are laminated, an intermediate layer 13, and a heat-fusible resin layer 12 are laminated. FIG. 8(e) shows a structure in which an outer layer 11 having two layers, a first base layer 11a and a second base layer 11b, and a heat-fusible resin layer 12 are laminated.

In FIG. 8(a), a layer 3a' having a back design forming a back design 3a is formed between the outer layer 11 and the intermediate layer 13, and a back design 3b is formed between the intermediate layer 13 and the heat-sealable resin layer 12. A back pattern layer 3b' to be formed is formed. The back design 3a can be seen from the outside of the packaging bag through the outer layer 11, and the back design 3b can be seen from the inside of the packaging bag through the heat-fusible resin layer 12. - 特許庁For the intermediate layer 13, for example, aluminum foil is used so that the back design 3a and the back design 3b are hidden from each other by the aluminum foil so that they do not interfere with each other. can be clearly seen.

FIG. 8(b) shows the configuration shown in the packaging bag 1A of the first embodiment, and includes a rear design layer 3a' forming the rear design 3a on the exposed surface of the outer layer 11. FIG. After laminating the outer layer 11 and the intermediate layer 13, the laminate 10 has a front picture 2a at the position where the front sheet 2 is arranged and a back picture 3a at the position where the back sheet 3 is arranged on the exposed surface of the outer layer 11. On the surface opposite to the outer layer 11, the back design 3b is printed at the position where the back sheet 3 is arranged. After that, the laminated body 10 is completed by laminating the heat-fusible resin layer 12 on the surface of the back pattern layer 3b' forming the back pattern 3b.

In FIG. 8(c), the outer layer 11 is composed of the first substrate layer 11a and the second substrate layer 11b, and the second laser cut line 5b is formed at the same position on the first substrate layer 11a and the second substrate layer 11b. It is Although the back pattern 3a is not shown, the surface of the first substrate layer 11a, the surface of the first substrate layer 11a facing the second substrate layer 11b, or the surface facing the intermediate layer 13 of the second substrate layer 11b formed on either side of the Further, the back design 3b is formed on the side of the intermediate layer 13 facing the heat-fusible resin layer 12. As shown in FIG.

FIG. 8(d) shows that the back pattern 3a and the back pattern 3b are formed on the side of the outer layer 11 facing the heat-fusible resin layer 12 via the concealing layer 3c. 11, a back pattern layer 3a' forming the back pattern 3a, a concealing layer 3c, a back pattern layer 3b' forming the back pattern 3b, a heat-fusible resin layer 12, and a second laser cut line 5b. are formed on the outer layer 11, the reverse pattern layer 3a', the concealing layer 3c, and the reverse pattern layer 3b'. The concealing layer 3c is an ink layer using white ink, gray ink, aluminum paste, or the like, and imparts concealing properties. In the case of a gray ink layer, an ink layer using aluminum paste, etc., it is preferable to sandwich white ink layers on both sides so as not to impair the design of the back patterns 3a and 3b. In this configuration, the back patterns 3a and 3b can be in-line printed on the outer layer 11 via the masking layer 3c by a printing machine, so that synchronization is facilitated.

In FIG. 8(e), the outer layer 11 in FIG. 8(d) has a two-layer structure in which a first base material layer 11a and a second base material layer 11b are laminated. The second laser cut line 5b is formed at the same position on the first base material layer 11a and the second base material layer 11b, the back pattern layer 3a', the concealing layer 3c, and the back pattern layer 3b', which constitute the outer layer 11. there is The reverse pattern layer 3a', the concealing layer 3c, and the reverse pattern layer 3b' are provided on the side of the first base layer 11a facing the second base layer 11b. Although not shown, these layers may be provided on the side of the second base material layer 11b facing the heat-fusible resin layer 12. As shown in FIG.
Although the back sheet 3 has back patterns 3a and 3b formed thereon, only the back pattern 3a may be formed.

The embodiments described so far are typical examples of the packaging bag according to the present invention. Anything that does not deviate is included in the present invention.

The present invention will be described in further detail with examples.

[Example 1]
A biaxially oriented polyethylene terephthalate film (PET) with a thickness of 16 μm is used for the outer layer 11, an aluminum foil (ALM) with a thickness of 7 μm is used for the intermediate layer 13, and a urethane-based anchor coating agent (AC) is applied to one surface of the PET. was applied and dried, the AC surface of PET and one surface of the ALM were hot melt extruded with a low density polyethylene (PE) having a thickness of 20 μm, sandwich laminated, and the other surface of the ALM was coated with a primer (Pr) and dried. . Next, the other side of the PET (the surface opposite to the AC side) is gravure printed (GR) using a printing plate having a front design 2a and a back design 3a imposed thereon to form a front design 2a and a back design 3a. Then, using a printing plate on which the back design 3b is imposed, gravure printing (GR) is performed on the Pr surface of the ALM to form the back design 3b. synchronized. Next, a urethane-based anchor coating agent (AC) is applied to the surface of the rear pattern 3b of the ALM and dried, and low-density polyethylene (PE) is hot-melt extruded on the surface to form a heat-fusible resin layer 12 having a thickness of 20 μm. A wide laminate 10 in which the front sheet 2 and the back sheet 3 were faced parallel to each other in the machine direction was obtained by extrusion lamination. The structure of the obtained laminate 10 is <GR/PET 16 μm/AC/PE 20 μm/ALM 7 μm/Pr/GR/AC/PE 20 μm>. Next, a first laser-cut line 5a was formed on the front sheet 2 and a second laser-cut line 5b was formed on the back sheet 3 at predetermined positions of the wide laminate 10 using a pulse oscillation laser. After that, a packaging bag 1A shown in FIG. 1 was produced by a bag making machine. The unsealing starting means is provided with a V notch on the outer edges of the left and right side edge joints 4y.

[Example 2]
A biaxially oriented polyethylene terephthalate film (PET) with a thickness of 16 μm was used for the outer layer 11 , and an aluminum foil (ALM) with a thickness of 7 μm was used for the intermediate layer 13 . A front design 2a and a back design 3a were formed by gravure printing (GR) using a printing plate having a front design 2a and a back design 3a imposed on one side of PET. Next, a urethane-based anchor coating agent (AC) is applied to the printed surface of the PET and dried, and the AC surface of the PET and one surface of the ALM are hot-melt extruded with a low-density polyethylene (PE) having a thickness of 20 μm, followed by sandwich lamination. Then, a urethane-based anchor coating agent (AC) is applied and dried on the other surface of the ALM, and low-density polyethylene (PE) is hot-melt extruded on that surface to form a heat-fusible resin layer 12 having a thickness of 20 μm. A wide laminate 10 was obtained in which the front sheet 2 and the back sheet 3 were faced parallel to each other in the machine direction by the lousion lamination. The structure of the obtained laminate 10 is <PET 16 μm/GR/AC/PE 20 μm/ALM 7 μm/AC/PE 20 μm>. Next, a first laser-cut line 5a was formed on the front sheet 2 and a second laser-cut line 5b was formed on the back sheet 3 at predetermined positions of the wide laminate 10 using a pulse oscillation laser. After that, a packaging bag 1B shown in FIG. 4 was produced by a bag making machine. The unsealing starting means is provided with a V notch on the outer edges of the left and right side edge joints 4y.

[Example 3]
As the outer layer 11, a transparent vapor deposited film (VMPET) in which aluminum oxide is vapor deposited (VM) on one side of a biaxially stretched polyethylene terephthalate film having a thickness of 16 μm as a first base material layer 11a and a thickness of 15 μm as a second base material layer 11b. A biaxially oriented nylon film (ONY) was used, and a linear low-density polyethylene film (LLDPE) having a thickness of 100 μm and having easy tearability was used for the heat-fusible resin layer 12 . A front design 2a and a back design 3a were formed by gravure printing (GR) using a printing plate having a front design 2a and a back design 3a imposed on the VM surface of VMPET. Next, the printed surface of VMPET and one surface of ONY are dry-laminated (DL) using a urethane-based two-component curing type dry lamination adhesive, and the other surface of ONY and LLDPE are dry-laminated (DL) in the same manner. ) to obtain a wide laminate 10 in which the front sheet 2 and the back sheet 3 are arranged parallel to each other in the machine direction. The structure of the obtained laminate 10 is <VMPET 16 μm/GR/DL/ONY 15 μm/DL/LLDPE 100 μm>. Next, a first laser-cut line 5a was formed on the front sheet 2 and a second laser-cut line 5b was formed on the back sheet 3 at predetermined positions of the wide laminate 10 using a pulse oscillation laser. After that, a self-supporting type packaging bag 1B shown in FIG. 4 was produced by a bag making machine. The laminate 10 was used for the bottom sheet 8 . The unsealing starting means is provided with a V notch on the outer edges of the left and right side edge joints 4y.

[Example 4]
A protruding male member 21 and a concave female member 22 are provided at opposing positions on the inner surface of the packaging bag below the first laser-cut line 5a of the front sheet 2 and the second laser-cut line 5b of the back sheet 3. A self-supporting packaging bag 1C shown in FIG. 7 was prepared by providing a synthetic resin fastener 20. Other than that, it was the same as Example 1. The laminate 10 of Example 1 was used as the bottom sheet 8 .

When the packaging bags of Examples 1 to 4 prepared above were torn open in the left-right direction from the V notch, all of them could be torn cleanly along the first laser-cut line 5a and the second laser-cut line 5b. Thus, a packaging bag opened along the outline of the pattern was obtained, which was excellent in cosmeticity and design. In Example 1, especially when the package was opened, the back design 3b appeared and the design that was switched in synchronization with the front design 2a appeared, which provided fun and interest.

1A, 1B, 1C packaging bag 1A', 1B' opened packaging bag 2 front sheet 2a front design 2a' front design layer 3 back sheet 3a, 3b back design 3a', 3b' back design layer 3c concealing layer 4 Joining portion 4y Left and right side edge joining portions 4t Upper and lower edge joining portions 5 Laser-cut line 5a First laser-cut line 5b Second laser-cut line 6 Tear-off piece 7 Unsealing means 8 Bottom sheet 10 Laminate 11 Outer layer 11a Second First Base Material Layer 11b Second Base Material Layer 12 Thermal Adhesive Resin Layer 13 Intermediate Layer 20 Synthetic Resin Articulator 21 Protruded Male Member 22 Concave Female Member S Start Point E End Point

Claims (2)

A front sheet and a back sheet consisting of a laminate are superimposed, and a joint is provided on the peripheral edge,
Of a pair of opposing left and right side edges, one side edge is the opening start side, the other side edge is the opening end side, and the front sheet and the back sheet are the opening start side. In a packaging bag that is torn from the opening to the opening end side and opened in the left and right direction,
A pattern is formed on at least one of the front sheet and the back sheet,
At least a laser cut line along the outline of the pattern is provided ,
The laminate has at least an outer layer and a heat-fusible resin layer. forming an edge joint,
A front pattern is formed on the front sheet,
The front sheet has a starting point at one of the left and right side edge joints, has an end point at the other side edge joint, and extends from the starting point to the end point. Equipped with 1 laser cut line,
A back pattern is formed on the back sheet,
The back sheet has the starting point at one of the left and right side edge joints,
a second laser-cut line having the endpoint at the other side edge joint and extending from the origin to the endpoint;
By making the formation positions of the first laser-cut line and the second laser-cut line different in the plan view state of the laminate, the front sheet and the back sheet are moved from the starting point side to the ending point side. When tearing and opening in the left-right direction, the front sheet is torn along the first laser-cut line, the back sheet is torn along the second laser-cut line, and the front design and the back design are aligned. A packaging bag characterized by the appearance of patterns that are switched in synchronism . Synthetic resin made of a protruding male member and a concave female member that are engaged with each other at positions facing each other on the inner surface of the packaging bag on the lower end side from the first laser-cut line and the second laser-cut line. an articulator is provided,
2. The packaging bag according to claim 1 , wherein a resealing function is provided by engaging the male member and the female member.

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