JP7305977B2 - Packaging bag and method for forming tear-induced weakening line in packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to an easy-open packaging bag and a method for forming tear-induced weakening lines in the packaging bag.

Conventionally, an easily openable packaging bag described in Patent Literature 1 is known. This packaging bag is formed into a bag shape by superimposing two resin films (a first film and a second film) on the front and back and heat-sealing the peripheral edges. Notches (tear initiation portions) are formed on the left and right side edges, and cut lines (tear guide weakening lines) for linearly weakening the resin film to guide tearing from the notches are formed on the front and back 2. It is formed on each of the sheets of resin film. The cut line extends from the outer edge line of the side edge where the notch is formed, returns to the outer edge line of the side edge, and is formed to surround the notch. It includes an unsealing guide line (auxiliary guide line) and an expected unsealing line (main guide line) formed so as to extend linearly from the peak of the doglegged opening guide line to the side edge on the opposite side.

In such a packaging bag, when the tear from the notch reaches the opening guide line (auxiliary guide line) formed so as to surround it, the tear progresses while being guided by the opening guide line, and the planned opening line (main guide line). Then, the tear that has reached the intended opening line is guided by the intended opening line (main guide line) and advances to the opposite side edge, whereby the packaging bag is opened.

According to such a packaging bag, tearing from the notch on one side edge proceeds to the opposite side edge while being guided by the cut lines, i.e., the opening guide line and the planned opening line. can be opened).

JP 2015-189483 A

In a packaging bag as described above, a tear from a notch on one side edge is passed through an unsealing guide line (auxiliary guide line) formed so as to surround it, and then along a planned unsealing line (main guide line) connected thereto. It is important to proceed steadily.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a packaging bag in which tearing from a tear initiation portion can reliably proceed to a main guide line connected thereto via an auxiliary guide line. .

In addition, the present invention provides a method for forming a tear guide weakening line including the auxiliary guide wire and the main guide wire so that a tear from the tear initiation portion reliably progresses through the auxiliary guide wire to the main guide wire connected thereto. It provides.

A packaging bag according to the present invention is formed in a bag shape by joining peripheral edges of a first film and a second film, and joining peripheral edges of the first film and the second film. A packaging bag in which a first tear initiation portion is formed at a first joint portion, and a tear guide weakening line for guiding tearing from the first tear initiation portion is formed in each of the first film and the second film, , the tear guide weakening line includes a main guide line extending in a direction away from the first joint side, and a main guide line extending in a direction away from the outer edge line side of the first joint portion, connecting to the main guide line and connecting to the outer edge line and a first auxiliary guide line returning toward the side, wherein the first auxiliary guide line extends a portion of a predetermined range including a connection point with the main guide line to a line that is deeper and/or thicker than the main guide line. The portion of the predetermined range including the connection point of the first auxiliary guide line with the main guide line, which has a first special shape portion that is a shaped groove, is convex in a direction away from the first joint portion side. It becomes a configuration including a curved line portion .

According to such a configuration, when the tear from the first tear initiation portion reaches the first auxiliary guide line, the tear is guided by the first auxiliary guide line, and is guided by the predetermined tear including the connection point with the main guide line. At the part of the range, go through the first special shaped part, which is a linear groove deeper and/or thicker than the main guiding line. The tearing occurs from the first specially shaped portion (including the curved line portion), which can be a portion that is easier to tear than the main guide line due to the shape of the linear groove, to the main guide line through the connection point with the main guide line. move on.

In the packaging bag according to the present invention, the first auxiliary guide line extends from the outer edge line of the first joint portion, connects to the main guide line, returns to the outer edge line, and has a shape surrounding the first tear start portion. can be configured to have

According to such a configuration, the first auxiliary guide line extends from the outer edge line of the first joint portion, returns to the outer edge line, and surrounds the first tear initiation portion. It reaches the first auxiliary guide line more reliably. As a result, the tear travels along the first auxiliary guide line and proceeds from the first specially shaped portion, which may be a portion that is easier to tear than the main guide line, to the main guide line via the connection point with the main guide line.

In the packaging bag according to the present invention, a second tear initiation portion is formed in the second joint facing the first joint, and the tear guide weakening line is further formed from the outer edge line side of the second joint a second auxiliary guide line extending in a direction away from the main guide line and returning toward the outer edge line, the second auxiliary guide line having a predetermined range including a connection point with the main guide line; portion as a second specially shaped portion that is a linear groove deeper and/or thicker than the main guide line.

According to such a configuration, when the tear from the second tear initiation portion reaches the second auxiliary guide line, the tear is guided by the second auxiliary guide line and is guided by the predetermined tear including the connection point with the main guide line. At the part of the range, go through a second special shaped part which is a linear groove deeper and/or thicker than the main guiding line. Then, the tear progresses from the second specially shaped portion, which can be a portion that is easier to tear than the main guide line due to the shape of the linear groove, to the main guide line via the connection point with the main guide line.

In the packaging bag according to the present invention, the portion of the predetermined range including the connection point of the second auxiliary guide line with the main guide line includes a curved line portion convex in a direction away from the second joint. can be configured.

According to such a configuration, tearing from the second tear initiation portion that reaches the second auxiliary guide line proceeds along the second auxiliary guide line, and the second specially shaped portion that can be a portion that is easier to tear than the main guide line. From the curved line portion, it proceeds to the main guide line through the connection point with the main guide line.

In the packaging bag according to the present invention, the second auxiliary guide line extends from the outer edge line of the second joint portion, connects to the main guide line, returns to the outer edge line, and has a shape surrounding the second tear start portion. can be configured to have

According to such a configuration, the second auxiliary guide line extends from the outer edge line of the second joint portion, returns to the outer edge line, and surrounds the second tear initiation portion. It leads to the second auxiliary guide line more reliably. As a result, the tear proceeds along the second auxiliary guide line, and proceeds from the second specially shaped portion, which may be a portion that is easier to tear than the main guide line, to the main guide line via the connection point with the main guide line.

Further, in the method for forming a tear-inducing weakening line according to the present invention, the first film and the second film are formed into a bag shape by joining their peripheral edge portions, and each of the first film and the second film A packaging bag, wherein a tear initiation portion is formed at a joint formed by bonding peripheral edges, and a tear-initiating weakening line for guiding tearing from the tear initiation portion is formed in each of the first film and the second film. The tear guide weakening line includes a main guide line extending away from the joint side and a main guide line extending away from the outer edge line side of the joint part, connecting to the main guide line and extending toward the outer edge line side. A method for forming the tear-inducing weakening lines in a packaging bag, comprising: an auxiliary guiding line that returns by a laser beam, wherein the tear-inducing weakening lines to be formed in each of the first film and the second film are processed by laser irradiation. a step of forming linear grooves by means of: a first step of forming the auxiliary guide line; and a second step of forming the main guide line, wherein the first step comprises the auxiliary guide line forming a portion of a predetermined range including a connection point with the main guide line of by irradiating the laser light more times than the number of times of laser light irradiation when forming the main guide line. becomes.

According to such a configuration, in the first step of forming the auxiliary guide line, the portion of the predetermined range including the connection point of the auxiliary guide line with the main guide line is irradiated with the laser beam when forming the main guide line. Since it is formed by repeatedly irradiating the laser beam more times than the number of times of irradiation of , the portion of the predetermined range including the connection point of the auxiliary guide line with the main guide line is at least deeper than the main guide line. can be.

Further, in the method for forming a tear-inducing weakening line according to the present invention, the first film and the second film are formed into a bag shape by joining their peripheral edge portions, and each of the first film and the second film A packaging bag, wherein a tear initiation portion is formed at a joint formed by bonding peripheral edges, and a tear-initiating weakening line for guiding tearing from the tear initiation portion is formed in each of the first film and the second film. The tear guide weakening line includes a main guide line extending away from the joint side and a main guide line extending away from the outer edge line side of the joint part, connecting to the main guide line and extending toward the outer edge line side. and an auxiliary guide line that returns by pulling the tear guide weakening line in a packaging bag, wherein the tear guide weakening line to be formed in each of the first film and the second film is formed by laser processing. a step of forming the groove as a shaped groove, comprising: a first step of forming the auxiliary guide line; and a second step of forming the main guide line, wherein the first step includes the The configuration includes a step of irradiating a laser beam a plurality of times while shifting a portion of a predetermined range including a connection point with the main guiding line by a pitch equal to or smaller than the spot diameter of the laser beam.

According to such a configuration, in the first step of forming the auxiliary guide line, the portion of the predetermined range including the connection point of the auxiliary guide line with the main guide line is shifted at a pitch equal to or less than the spot diameter of the laser beam. However, since the grooves are formed by irradiating the laser beam multiple times, a portion of a predetermined range including the connection point of the auxiliary guide wire with the main guide wire can become a linear groove that is at least thicker than the main guide wire.

Furthermore, in the method for forming a tear-inducing weakening line according to the present invention, the first film and the second film are formed into a bag shape by joining their peripheral edges, and the first film and the second film A packaging bag in which a tear initiation portion is formed at the joint formed by joining the respective peripheral edge portions, and a tear guide weakening line that guides tearing from the tear initiation portion is formed in each of the first film and the second film. The tear guide weakening line includes a main guide line extending in a direction away from the joint portion side, and a main guide line extending in a direction away from the outer edge line side of the joint portion and connected to the main guide line to the outer edge line side. and an auxiliary guide line returning toward the packaging bag, wherein the tear guide weakening line to be formed in each of the first film and the second film is laser machined. a step of forming linear grooves by means of: a first step of forming the auxiliary guide line; and a second step of forming the main guide line, wherein the first step comprises the auxiliary guide line of the laser beam to irradiate a portion of a predetermined range including a connection point with the main guide line, and a portion of a predetermined range including the connection point of the auxiliary guide line with the main guide line when forming the main guide line. It has a configuration including a step of forming by irradiating a laser beam having a higher output than the output.

According to such a configuration, in the first step of forming the auxiliary guide line, the portion of the predetermined range including the connection point of the auxiliary guide line with the main guide line is irradiated with the laser when the main guide line is formed. Since it is formed by irradiating a laser beam having an output larger than that of light, a portion of a predetermined range including a connection point of the auxiliary guide wire with the main guide wire is deeper and/or thicker than the main guide wire. can be grooves.

In the method of forming each tear guide weakening line described above, either step 1 of forming the auxiliary guide line or step 2 of forming the main guide line may be performed first.

According to the packaging bag of the present invention, tearing from the first tear initiation portion proceeds along the first auxiliary guide line, and the connection point between the first specially shaped portion and the main guide line, which can be a portion that is easier to tear than the main guide line. , the tear from the first tear initiation portion can reliably proceed to the main guide line via the first auxiliary guide line.

In addition, according to the method for forming each tear guide weakening line according to the present invention, the portion of the predetermined range including the connection point with the main guide line of the auxiliary guide line is reduced from the main guide line by processing with laser light irradiation. Since the linear grooves can be deep and/or thick, the predetermined range of the portion including the connection point of the auxiliary guide wire with the main guide wire can be a portion that is easier to tear than the main guide wire. Therefore, it is possible to form a tear guide weakening line that allows the tear from the tear initiation portion to reliably proceed to the main guide line through the auxiliary guide line.

FIG. 1 is a front view showing essential parts of a packaging bag according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing an example of the layer structure of each of the front side film and the back side film constituting the packaging bag shown in FIG. 1, and an example of grooves formed by laser processing as tear guide weakening lines. FIG. 3 is an enlarged view of the left notch (first tear initiation portion) formed in the packaging bag shown in FIG. 1 and tear guide weakening lines (first auxiliary guide line, main guide line) formed in the vicinity thereof. It is a diagram. FIG. 4 is a diagram showing a further enlarged view of area A in FIG. FIG. 5 is a cross-sectional view showing an example of grooves formed by laser processing in the curved line portion of the first auxiliary guiding line. FIG. 6 is a diagram showing an example of how the packaging bag shown in FIG. 1 is torn when opened. FIG. 7 is a diagram showing an opening cut of a packaging bag that has been torn open by the tearing method shown in FIG. FIG. 8A is a diagram showing an example of a tearing cut extending from the first auxiliary guide line to the main guide line. FIG. 8B is a diagram showing an example of a tear cut guided by the main guide line to the outer edge line of the second joint. FIG. 9 is a diagram showing an example of a state in which the first tear guide weakening line and the second tear guide weakening line are displaced. FIG. 10 is a diagram showing the results of the opening test.

An embodiment of the present invention will be described with reference to the drawings.

A packaging bag according to an embodiment of the present invention is constructed as shown in FIG.

In FIG. 1, the packaging bag 100 is, for example, a pouch with a plastic fastener. is formed in Each of the front side film 100a and the back side film 100b includes, for example, as shown in FIG. and a PE layer 104 made of polyethylene. The PET layer 101 is highly transparent, has properties of good dimensional stability that is resistant to expansion and contraction, and is suitable as a layer for printing. The NY layer 102 is a layer for securing strength, which has a property of being resistant to impact and bending, and having a property of being hard to be punctured. The aluminum layer 103 is a metal layer for blocking entry and exit of gases such as air (oxygen) and moisture across this layer. The PE layer 104 has a property of melting at about 100° C. to 130° C. and serves as a sealant layer suitable for heat sealing.

In this way, the front side film 100a and the back side film 100b having a structure in which the PE layer 104 and the PET layer 101 are arranged on the outermost sides of the front and back sides and the NY layer 102 and the aluminum layer 103 are laminated so as to be adjacent to each other With the layers 104 facing each other, the PE layers 104 on the peripheries of the front side film 100a and the back side film 100b are sealed (bonded) by heat fusion to form a bag. As a result, with the PE layer 104 facing inside, as shown in FIG. 1, it is sealed by the peripheral seal portions (joint portions) 16, 17, and 18 (the lower seal portion facing the seal portion 18 is omitted). A packaging bag 100 is formed.

Returning to FIG. 1, the packaging bag 100 includes a plastic fastener extending linearly between the two laterally opposed seal portions 16 and 17 at a position spaced downward from the upper seal portion 18 by a predetermined distance. 19 are provided. This plastic fastener 19 has a known structure and can be opened and closed. With the plastic fastener 19 as a boundary, a storage portion for contents (for example, food and drink) is formed in a region opposite to the upper seal portion 18 . After unsealing, the contents can be taken out from the containing part by opening the plastic fastener 19, and the containing part containing the contents can be sealed by closing the plastic fastener 19. - 特許庁

When the packaging bag 100 is provided with a gusset portion at the bottom, the upper peripheral edge portions of the front side film 100a and the back side film 100b accommodate the contents in the storage portion with the plastic fastener 19 opened. After that, the plastic fasteners 19 are closed to seal the container, forming an upper seal 18 . When the packaging bag 100 is a flat pouch that does not have a gusset portion, after the seal portions 18 on the upper side of the front side film 100a and the back side film 100b are formed, the contents are accommodated from the lower peripheral edge portion. and a lower seal is formed.

In FIG. 1, the front film 100a is formed with the first tear guide weakening line 10, and the back film 100b is formed with the second tear guide weakening line 20. As shown in FIG. A left notch 15a (first tear start portion) is formed in the left sealing portion 16 (first joint portion) of the packaging bag 100, and a right notch is formed in the right sealing portion 17 (second joint portion) of the packaging bag 100. 15b (second tear initiation portion) is formed so as to face the left notch 15a. Each of the first tear-inducing line of weakness 10 and the second tear-inducing line of weakness 20 extends from the outer edge line of the seal portion 16 to the outer edge line of the opposite seal portion 17 .

The first tear guide weakening line 10 formed on the front side film 100a includes a main guide line 11 (10) extending from the outer edge line of the seal portion 16 to the outer edge line of the seal portion 17, the left notch 15a of the seal portion 16 and the main guide line. A first auxiliary guide wire 12a (10) formed to surround the end of the main guide wire 11, and a right notch 15b of the seal portion 17 and a second auxiliary guide wire 12b formed to surround the end of the main guide wire 11. Including (10). The second tear guide weakening line 20 formed on the back film 100b includes a main guide line 21 (20) linearly extending from the outer edge of the seal portion 16 to the outer edge line of the seal portion 17, and the left notch of the seal portion 16. 15a and the first auxiliary guide wire 22a (20) formed to surround the end of the main guide wire 21, and the right notch 15b of the seal portion 17 and the first guide wire 22a (20) formed to surround the end of the main guide wire 21 Includes 2 auxiliary guide wires 22b (20).

The left notch 15a and the right notch 15b are formed so as to overlap the ends of the main guide wire 11 and the main guide wire 21 on the front and back sides. The main guide line 21 or the right notch 15b and the main guide line 11 or the main guide line 21 may not overlap exactly.

The detailed shape of the first auxiliary guide line 12a (10) formed as part of the first tear guide weakening line 10 on the front side film 100a is shown in FIG. In FIG. 3, the first auxiliary guide line 12a has a straight portion 121 of a predetermined length extending from the outer edge line of the front film 100a (seal portion 16) so as to be perpendicular to the outer edge line, and a straight portion 121 continuing from the straight portion 121 and inclined downward. and a curved line that continues from the inclined line portion 122 and extends in a convex curved shape (for example, an arc shape) in the tearing direction (the direction away from the seal portion 16) and connects to the main guide wire 11. a portion 123, a slanted line portion 124 continuing from the curved line portion 123 and extending so as to incline downward; and a straight portion 125 of predetermined length returning to the .

The second auxiliary guide wire 12b also has the same shape as the first auxiliary guide wire 12a described above, and the relative positional relationship with the main guide wire 11 is also the same. Further, each of the first auxiliary guide wire 22a and the second auxiliary guide wire 22b formed on the back film 100b as part of the second tear guide weakening wire 20 has the same shape as the first auxiliary guide wire 12a described above. The positional relationship with the main guide wire 21 is also the same as the relative positional relationship between the first auxiliary guide wire 12a and the main guide wire 11 in the front film 100a described above.

Returning to FIG. 1, the packaging bag 100 (front side film 100a, back side film 100b) is teared in the tear direction (width direction) starting from the left notch 15a into three regions, the first region E1, the second region E2 and the third region. When divided into E3, in the first region E1, the set of the first auxiliary guide line 12a and the straight portion 111 of the main guide line 11 on the front side film 100a, the first auxiliary guide line 22a and the main guide line 22a on the back side film 100b. The set of straight portions 211 of the guide wire 21 is the first overlapping portion that has the same shape and overlaps with each other. In the second region E2, the main guide line 11 of the front film 100a smoothly continues from the straight portion 111 without including a portion extending upward (toward the upper seal portion 18 side) from the straight portion 111 and the plastic fastener 19. It is a curved portion 112 curved so as to protrude to the side (downward of the packaging bag 100). The curved portion 112 of the main guide wire 11 on the front side film 100a and the straight portion 212 of the main guide wire 21 on the back side film 100b are separate portions that do not overlap each other. In the third region E3, a set of the straight portion 113 of the main guide wire 11 and the second auxiliary guide wire 12b on the front side film 100a, and a straight portion 213 of the main guide wire 21 and the second auxiliary guide wire 22b on the back side film 100b. are the second overlapping portions having the same shape and overlapping each other.

In the first tear guide weakening line 10 and the second tear guide weakening line 20, the first overlapping portions corresponding to the first region E1 (first auxiliary guide wire 12a, first auxiliary guide wire 22a, straight portion 111, straight portion 211 ) in the tearing direction (the width of the first region E1), and the second overlapping portion corresponding to the third region E3 (second auxiliary guide line 12b, second auxiliary guide line 22b, straight portion 113, straight portion 213) and the length in the tearing direction (the width of the third region E3) (the length of the entire overlapping portion) is the tearing distance of the separation portion (curved portion 112, straight portion 212) corresponding to the second region E2. It is longer (approximately twice as long) than the length in the direction (the width of the second region E2). That is, in the first tear-inducing weakening line 10 and the second tear-inducing weakening line 20, the length in the tearing direction of the overlapping portions (the first overlapping portion and the second overlapping portion) is longer than the length in the tearing direction of the separating portions.

The first tear guide weakening wire 10 (main guide wire 11, first auxiliary guide wire 12a, second auxiliary guide wire 12b) and second tear guide weaken wire 20 (main guide wire 21, first auxiliary guide wire 22a, The second auxiliary guide line 22b) is formed on the front side film 100a and the back side film 100b by laser beam irradiation (laser processing) from a laser light source. Specifically, laser light emitted in a pulsed or continuous manner from a laser light source is applied to the front film 100a and the back film 100b (actually, they is irradiated to the corresponding area of the raw film to be cut). For example, the first auxiliary guide wires 12a and 22a are formed in the first step, the main guide wires 11 and 21 are formed in the second step, and the second auxiliary guide wires 12b and 22b are formed in the third step. be. Thereby, as shown in FIG. A line 22a, a main guide line 21, and a second auxiliary guide line 22b) are formed as linear grooves 110 with a depth from the PET layer 101 to the NY layer 102 of the front side film 100a and the back side film 100b.

In the first step, as shown enlarged in FIG. 4 together with FIG. The curved portion 123 is formed by irradiating the laser beam a plurality of times (for example, twice) including the aforementioned laser beam irradiation. As a result, as shown in FIG. 5, the curved line portion 123 reaches the aluminum layer 103 and the other portions of the main guide wire 11 and the first auxiliary guide wire 12a (straight line portions 121 and 125, inclined line portion 122, 124) are formed as linear grooves 110 that are at least deeper than each of the grooves 124). Also, the curved line portion 123 can be formed by irradiating a laser beam a plurality of times while shifting at a pitch equal to or smaller than the spot diameter of the laser beam. In this case, the curved line portion 123 can be formed as a linear groove 110 that is at least thicker than each of the other portions of the main guide wire 11 and the first auxiliary guide wire 12a. In addition, the output of the curved line portion 123 is greater than that of the laser beam when forming each of the other portions (straight line portions 121 and 125 and inclined line portions 122 and 124) of the main guide line 11 and the first auxiliary guide line 12a. It can be formed by irradiating output laser light. In this case, the curved line portion 123 can be formed as a linear groove 110 that is deeper and/or thicker than the other portions of the main guide wire 11 and the first auxiliary guide wire 12a. It should be noted that the curved line portion 123 is made deeper than the other portions of the main guide wire 11 and the first auxiliary guide wire 12a by each of the multiple irradiations of the laser beams and the irradiation of the laser beams while being shifted. And it can also be formed as a thick linear groove 110 .

The curved line portions 123 formed as linear grooves 110 that are deeper and/or thicker than the other portions (straight line portions 121, 125, inclined line portions 122, 124) of the main guide wire 11 and the first auxiliary guide wire 12a are , the degree of weakening is greater than that of the main guide wire 11 and the other portions, and the degree of tearability is greater than that of the main guide wire 11 and the other portions. That is, the curved line portion 123, which is a linear groove that is deeper and/or thicker than the main guide wire 11 and the other portions, has a higher degree of tearability and is distinguished from the main guide wire 11 and the other portions. is included in the first tear-inducing weakening line 10 as a first specially shaped portion.

Regarding the second auxiliary guide wire 12b connected to the main guide wire 11 in the first tear guide weakening wire 10, similarly to the first auxiliary guide wire 12a described above, the curved line portion 123 of the second auxiliary guide wire 12b Different irradiation modes (multiple irradiation, shifted irradiation, power-enhancing irradiation) are formed as deeper and/or thicker linear grooves 110 . Therefore, the curved line portion 123 of the second auxiliary guide wire 12b also has a greater degree of tearability than the main guide wire 11 and the other portions, and is distinguished from the main guide wire 11 and the other portions. Included in the first tear-inducing line of weakness 10 as two specially shaped portions. The same applies to each of the first auxiliary guide wire 21a and the second auxiliary guide wire 21b connected to the main guide wire 21 of the second tear guide weakening wire 20 formed in the back film 100b. The curved line portion 123 of the wire 21a is the first special shape portion formed as a deeper and/or thicker linear groove 110, and the curved line portion 123 of the second auxiliary guide wire 21b is deeper and/or thicker. It is a second special shape portion formed as a linear groove 110 .

The packaging bag 100 described above can basically be opened, for example, as shown in FIG.

In FIG. 6, when the packaging bag 100 (the front side film 100a and the back side film 100b) starts to be torn from the left notch 15a of the sealing portion 16 toward the sealing portion 17 on the opposite side, the front side film 100a in the first region E1 The tear proceeds while being guided by the straight portion 111 of the main guide wire 11 . Even if the tear deviates from the straight portion 111 (main guide wire 11), when it reaches the first auxiliary guide wire 12a, it progresses along the first auxiliary guide wire 12a and reaches the straight portion 111 of the main guide wire 11, After that, it advances while being guided by the straight portion 111 . At this time, the tear at the backside film 100b also progresses while being guided by the straight portion 211 of the main guide line 21, and even if the tear deviates from the straight portion 211 (main guide line 21), the first auxiliary It returns to the straight portion 211 via the guide wire 22a and advances while being guided by the straight portion 211. - 特許庁

In the first region E1, in the front side film 100a and the back side film 100b, tearing from the left notch 15a simultaneously causes the straight portion 111 of the main guide wire 11 and the straight portion 211 of the main guide wire 21 (first overlapping portion). proceed while being guided by In this case, the packaging bag 100 is torn so that the actual tear lines (see La and Lb in FIG. 6) overlap the front film 100a and the back film 100b without shifting. Details of the case where the tear from the left notch 15a deviates from the main guide lines 11, 21, advances while being guided by the first auxiliary guide lines 12a, 22a, and reaches the main guide line 11 will be described later.

When the tearing of the packaging bag 100 moves from the first region E1 to the second region E2, the tearing of the front side film 100a moves from the straight portion 111 of the main guide line 11 to the curved portion 112, and proceeds while being guided by the curved portion 112. . On the other hand, the tearing of the backside film 100b moves from the straight portion 211 of the main guide wire 21 to the straight portion 212, and proceeds while being guided by the straight portion 212. As shown in FIG. In this case, when the packaging bag 100 is torn, the front side film 100a and the back side film 100b are separated without overlapping (the curved portion 112 of the main guide wire 11 (10), the straight portion 212 of the main guide wire 21 (20)). while the actual tear lines (see La and Lb in FIG. 6) are deviated from each other.

When the tearing of the packaging bag 100 shifts from the second region E2 to the third region E3, the tearing of the front side film 100a shifts from the curved portion 112 of the main guide wire 11 to the straight portion 113, and then the straight portion 113 of the main guide wire 11. proceed while being guided by Then, the tear reaches the outer edge line of the seal portion 17 while being guided by the straight portion 113 of the main guide wire 11 . On the other hand, the tearing of the backside film 100b also continues from the straight portion 212 of the main guide line 21 to the straight portion 213 and progresses while being guided by the straight portion 213 . Then, the tear is guided to the straight portion 213 and reaches the outer edge line of the seal portion 17 . In this case, when the packaging bag 100 is torn, the front side film 100a and the back side film 100b are simultaneously guided to the second overlapping portions (113, 213) and are actually torn along the actual tearing lines (see La and Lb in FIG. 6). are torn while overlapping each other without shifting, and the tear reaches the outer edge line of the seal portion 17 at once. In the third region E3, the tear guided by the main guide lines 11 and 21 passes through the connection point P (see FIG. 4) with the second auxiliary guide lines 12b and 22b. Tearing through P is discussed below.

In this way, the tearing of the packaging bag 100 starting from the left notch 15a of the sealing portion 16 reaches the outer edge line of the sealing portion 17 on the opposite side, whereby the packaging bag 100 is opened. When the packaging bag 100 is opened, as shown in FIG. 7, the edge line La of the opening cut of the front film 100a corresponds to the straight portion 111, the curved portion 112, and the straight portion 113 of the main guiding wire 11. (The first auxiliary guide wire 12a may be included). Also, the edge line Lb of the opening cut of the backside film 100b corresponds to the straight portions 211, 212, 213 of the main guide wire 21 (the first auxiliary guide wire 22a may be included). Here, the curved portion 112 of the main guide wire 11 and the straight portion 212 of the main guide wire 21 corresponding to the second region E2 (see FIG. 6) of the first tear guide weakening line 10 and the second tear guide weakening line 20 are formed so that they do not overlap as the separated portions (112, 212). , there is no overlap with the part of , but is shifted by an amount Δ. Then, the plastic fastener 19 can be easily opened by pinching the rear side film 100b of the shifted portion to open the unsealed packaging bag 100. - 特許庁

When the packaging bag 100 (front side film 100a, back side film 100b) is opened as described above, the tear from the left notch 15a deviates from the main guide lines 11, 21 and is guided to the first auxiliary guide lines 12a, 22a. A case in which the vehicle advances while being pulled and reaches the main guiding line 11 will be described.

The tear that advances while being guided by the first auxiliary guide wires 12a, 22a (see FIG. 3) by the force applied generally in the extending direction of the main guide wires 11, 21 proceeds from the inclined line portion 124 to the curved wire portion 123, for example. . Even if the force is applied generally in the direction in which the main guide wires 11 and 21 extend, the curved line portions 123 (first specially shaped portions) of the first auxiliary guide wires 12a and 22a are not deep and/or thick linear grooves 110 ( 5), the tear follows the curved line portion 123 more smoothly. The tear that proceeds smoothly while being guided by the curved line portion 123 is caused by the force applied generally in the extending direction of the main guide lines 11 and 21, and the connection point P (see FIG. 4) with the main guide lines 11 and 21. , it moves to the main guide lines 11 and 12 without proceeding through the curved line portion 123 as it is. After that, the tear progresses toward the seal portion 17 on the opposite side while being guided by the main guide lines 11 and 21 . As a result, the edge lines La, Lb of the opening cut edges of the front side film 100a and the back side film 100b continuing from the left notch 15a are, for example, the first auxiliary guide lines 12a, 22b (for example, the inclined line portion 124, as shown in FIG. 8A). , curved line portion 123 ) and the main guide lines 11 , 21 .

As described above, the tear that advances while being guided by the main guide lines 11 and 21 enters the third region E3 (see FIG. 6), and the second auxiliary guide lines 12b and 22b (curved line portion 123 (see FIG. 4)) and reaches the connection point P of . A curved line portion 123 of the second auxiliary guide lines 12b, 22b passing through the connection point P is convex in a direction away from the seal portion 17 (second joint portion) opposite to the tearing direction. Even if the curved line portions 123 (second special shaped portions) of the second auxiliary guide wires 12b, 22b are formed as deep and/or thick linear grooves 110 (see FIG. 5), the curved line portions 123 ( In combination with the above-mentioned shape of the second special-shaped portion), the tear is caused by the force applied generally in the direction in which the main guide lines 11 and 21 extend, and the tearing is caused by the second auxiliary guide line from the main guide lines 11 and 21 via the connection point P. Without moving to 12b, 22b (curved line portion 123), it reaches the outer edge line of the seal portion 17 at once while being guided by the main guide lines 11, 21 as it is. As a result, on the opposite side of the tear starting point from the left notch 15a, the edge lines La and Lb of the cut openings of the front side film 100a and the back side film 100b are, for example, as shown in FIG. It corresponds to the straight main guide lines 11 and 21 instead of 22b.

From the viewpoint of preventing the tear guided by the main guide wires 11 and 21 on the opposite side of the tear start point (notch 15a) from deviating from the connection P to the second auxiliary guide wires 12a and 22b, the second The curved line portion 123 (second special shape portion), which is the deeper and/or thicker linear groove 110, of the auxiliary guide wires 12b, 22b is preferably connected to the main guide wires 11, 21 at right angles.

According to the packaging bag 100 described above, tearing from the left notch 15a (first tear start portion) due to the force in the direction in which the main guide lines 11 and 21 extend proceeds along the first auxiliary guide lines 12a and 22b, and the main guide lines 12a and 22b From the curved line portion 123 (first specially shaped portion), which is easier to tear than the lines 11 and 21 and other portions, respectively, to the main guide lines 11 and 21 via the connection point P with the main guide lines 11 and 21 Therefore, tearing from the left notch 15a (first tear start portion) can reliably proceed to the main guide lines 11 and 21 via the first auxiliary guide lines 12a and 22a (see FIG. 8A).

In the packaging bag 100 described above, on the opposite side of the tear start point from the left notch 15a, the tear proceeds while being guided by the main guide lines 11, 21 from the connection point P with the second auxiliary guide lines 12b, 22b. Without moving to the second auxiliary guide wires 12b and 22b, it is guided by the main guide wires 11 and 21 and reaches the outer edge line of the seal portion 17 at once. Therefore, the opening cut at the tear end can be straight and clean without disturbance (see FIG. 8B).

Also in the case of tearing starting from the right notch 15b on the opposite side of the left notch 15a described above, if the second auxiliary guide wires 12b and 22b are reached, the second auxiliary guide wires 12b and 22b while being guided to the main guide lines 11 and 21 through the connection point P with the main guide lines 11 and 21. Also, on the side opposite to the right notch 15b, as described above, the tear progressing while being guided by the main guide lines 11 and 12 is caused by the connection point with the first auxiliary guide lines 12a and 22b (curved line portion 123). While being guided by the main guide lines 11 and 21 as they are from P, they reach the outer edge line of the seal portion 16 at once. Therefore, in this case as well, the tear from the right notch 15b (second tear start portion) can reliably proceed to the main guide lines 11 and 21 through the second auxiliary guide lines 12a and 22a, and the tear end portion can be The opening cut can be straight and clean without disturbance. In this way, the first auxiliary guide lines 12a, 22a and the second auxiliary guide lines 12b, 22b are provided, and a portion (curved line portion 123) of a predetermined range including the connection point P with each of the main guide lines 11, 21 is formed. , the main guide lines 11 and 21 are easier to tear, so that the user can open along the main guide lines 11 and 21 regardless of whether the user opens from the left or right side. It can be in a straight clean state without disturbance.

By the way, the first tear guide weakening line formed on the front side film 100a is caused by misalignment of film cutting, misalignment of film bonding, misalignment of the transported film itself, etc. that may occur in the manufacturing process of the packaging bag 100. 10 and the second tear-inducing weakened line 20 formed in the backside film 100b may be slightly misaligned. Specifically, the first auxiliary guiding line 12a of the front side film 100a and the straight portion 111 of the main guiding line 11 in the first region E1 (see FIG. 6) that should originally overlap, and the first auxiliary guiding line of the back side film 100b 22a and the straight portion 211 of the main guide wire 21 are slightly displaced. Similarly, in the third region E3, the straight portions 113 of the second auxiliary guide wire 12b and the main guide wire 11 of the front film 100a and the straight portions of the second auxiliary guide wire 22b and the main guide wire 21 of the back film 100b 213 is slightly shifted.

The curved line portions 123 of the first auxiliary guide wires 12a, 22a (second auxiliary guide wires 12b, 22b) are connected to the main guide wires 11, 21 and their first auxiliary guide wires 12a, 22a (second auxiliary guide wires 12b, 22b). ) is effective for the deviation between the first tear guide weakening line 10 and the second tear guide line as described above. In order to confirm whether or not, the following opening test was performed. Specifically, as shown in FIG. 9, the first tear guide weakening line 10 including the first auxiliary guide lines 12a, 22a with an interval of 6 mm on the outer edge line and the second tear guide line 20 overlap each other. An opening test was performed on the packaging bag 100 with a 4 mm deviation (interval between the main guide lines 11 and 21 = 4 mm).

As described above, in the case of packaging bags in which the curved line portions 123 of the first auxiliary guide wires 12a, 22a and the second auxiliary guide wires 12b, 22b are not formed as deep and/or thick linear grooves, the opening success rate is 4. /10. Originally, tearing starts from the tip of the notch 15a, and after the tear reaches the first auxiliary guide lines 12a, 22a, the main guide lines 11, 21 However, since the first auxiliary guide lines 12a, 22a are connected to the main guide lines 11, 21 at a certain angle, before reaching the guide lines 11, 21, the first auxiliary guide It is believed that this is because there were cases where the lines 12a and 22a were deviated.

On the other hand, as described above, the curved line portions 123 of the first auxiliary guide wires 12a, 22a and the second auxiliary guide wires 12b, 22b are linear grooves that are deeper and/or thicker than the other portions and the main guide wires 11, 21, respectively. The following results were obtained for the packaging bag 100 formed as:

(1) Opening test conditions Tear to the back side and tear to the front side from the left notch 15a Tear to the back side and tear to the front side from the right notch 15b. 100b was directed upward.
Each tear was performed by Practitioner A on 2 bags, Practitioner B on 4 bags, and Practitioner C on 4 bags.
(2) Results of Opening Test As shown in FIG. 10, there were no opening failures in all opening tests, and a good opening state could be obtained.

From the results of the above opening test, the curved wire portions 123 connected to the main guide wires 11, 21 of the first auxiliary guide wires 12a, 22a and the curved wire portions 123 connected to the main guide wires 11, 21 of the second auxiliary guide wires 12b, 22b Each of the curved portions 123 is formed as a deep and/or thick linear groove by processing (irradiating laser light multiple times) to increase the degree of tear easiness of each of the other portions and the main guide lines 11 and 21. are tear guide weakening lines 10 (first auxiliary guide line 12a, main guide line 11, second auxiliary guide line 22a) of front side film 100a and tear guide weakening lines 20 of back side film 100b (first auxiliary guide line 22a, It was found that even if the main guide wire 11 and the second auxiliary guide wire 22b) are slightly misaligned, it is also effective from the viewpoint of being able to be opened satisfactorily.

For example, tearing starts from the tip of the notch 15a, and after the tear reaches the first auxiliary guide lines 12a, 22a, it is guided to the main guide lines 11, 21 along the first auxiliary guide lines 12a, 22a. is desirable. However, since the first auxiliary guide wires 12a, 22a are connected to the main guide wires 11, 21 at a certain angle, the first auxiliary guide wires 12a, 22a, 12a and 22a are separated before the tear reaches the main guide wires 11, 21. 22a in some cases. In particular, when the tear guide weakening lines 10 and 20 including the first auxiliary guide lines 12a and 22b are formed with deviations due to production variations as shown in FIG. Where necessary, due to the orientation of the film and the slight difference in thickness of the tear-inducing weakening lines 10, 20 on the front and back sides, the film is pulled to the superior side, and one side deviates from the tear-inducing weakening lines 10, 20. was there. Therefore, as confirmed by the opening test, this problem can be solved by deepening and/or thickening the portions of the first auxiliary guide wires 12a and 22a including the connection points with the main guide wires 11 and 21. was made.

The shapes of the first auxiliary guide wires 12a and 22a and the second auxiliary guide wires 12b and 22b are not limited to the shapes described above (see FIGS. 3 and 4), and the seal portions 16 and 17 (first joint portion, The shape may be any shape as long as it extends in a direction away from the outer edge line side of the second joint), connects (including crosses) to the main guide lines 11 and 21, and returns toward the outer edge line side. The relationship between the first auxiliary guide lines 12a, 22a and the second auxiliary guide lines 12b, 22b and the main guide lines 11, 21 is also such that the main guide lines 11, 21 If it is connected to the guide wires 12b and 22b, the ends of the main guide wires 11 and 12 pass through the first auxiliary guide wires 12a and 22a and the second auxiliary guide wires 12b and 22b as shown in FIG. Even in the (intersecting state), the ends of the main guide lines 11 and 12 may be on the first auxiliary guide lines 12a and 22a and the second auxiliary guide lines 12b and 22b. Furthermore, the tear guide weakening lines 10, 20 may include either one of the first auxiliary guide lines 12a, 22a and the second auxiliary guide lines 12b, 22b.

Further, the method of forming deep and/or thick linear grooves is not limited to multiple irradiations of laser light as described above. For example, by mechanically using a cutter or the like, a predetermined range (including points of connection (including intersections)) of the first auxiliary guide lines 12a, 22b and the second auxiliary guide lines 12b, 22b with the main guide lines 11, 21, respectively For example, the curved line portion 123) may be processed to have a linear groove that is deeper and/or thicker than the other portions. Further, the processing for forming deep and/or thick linear grooves may be applied to the entire first auxiliary guide wires 12a, 22a and second auxiliary guide wires 12b, 22b. In this case, the first auxiliary guide wires 12a, 22a and the second auxiliary guide wires 12b, 22b are formed as linear grooves deeper and/or thicker than the main guide wires 11, 21, respectively. It can be easier to tear.

Further, the packaging bag 100 described above is not processed to make all of the tear-inducing weakening lines 10, 20 deeper and/or thicker. If the whole is made thicker, the strength of the tear-inducing weakening lines 10, 20 is lowered, so there is a high risk of tearing the tear-inducing weakening lines 10, 20 during transportation, filling, or the like. In addition, the tear-inducing weakening lines 10 and 20 are conspicuous, which impairs the design of the packaging bag. From the viewpoint of production efficiency and economic efficiency, as described above, the tear guide weakening lines 10 and 20 are limited to a part or all of the first auxiliary guide wires 12a and 22a and the second auxiliary guide wires 12b and 22b. It is preferable that the number of portions processed to increase the degree of hardness is small, and that the laser output be low.

Furthermore, when printing is applied to the packaging bag 100, the printing is removed by laser processing. In particular, at the tear start portions (notches 15a and 15b), there are many printings related to the function of indicating the opening position, so it is desirable to avoid the printing being scraped off by laser processing as much as possible. Considering this, instead of laser processing a plurality of wires at intervals, as described above, each of the first auxiliary guide wires 12a, 22a and the second auxiliary guide wires 12b, 22b Special laser processing is preferably performed at slightly offset locations.

In addition, the present invention is not limited to the above-described embodiment and modifications thereof. Various modifications are possible based on the gist of the present invention, and these are not excluded from the scope of the present invention.

INDUSTRIAL APPLICABILITY The packaging bag according to the present invention has the effect that the tear from the tear initiation portion can reliably proceed to the main guide wire connected thereto through the auxiliary guide wire, and is useful as an easy-open packaging bag. is.

10 First tear guide weakening line 11 Main guide wire 111 Straight portion 112 Curved portion 113 Straight portion 12a First auxiliary guide wire 12b Second auxiliary guide wire 121, 125 Straight portions 122, 124 Inclined portion 125 Curved line portion 15a Left notch 15b Right notch 16, 17, 18 Seal portion 19 Plastic fastener 20 Second tear guide weakening line 21 Main guiding wire 211, 212, 213 Straight portion 22a First auxiliary guiding wire 22b Second auxiliary guiding wire 100 Packaging bag 100a Front side film 100b Back side the film

Claims (5)

The first film and the second film are formed in a bag shape by joining their peripheral edges, and the first tear is formed at the first joint formed by joining the peripheral edges of the first film and the second film. A packaging bag in which a tear initiation portion is formed and a tear guide weakening line that guides tearing from the first tear initiation portion is formed in each of the first film and the second film,
The tear-inducing weakening line is
a main guide line extending in a direction away from the first joint side;
a first auxiliary guide wire extending in a direction away from the outer edge line side of the first joint, connecting to the main guide wire and returning toward the outer edge line side;
The first auxiliary guide line has a portion of a predetermined range including a connection point with the main guide line as a first specially shaped portion that is a linear groove that is deeper and/or thicker than the main guide line,
The packaging bag, wherein the portion of the predetermined range including the connection point of the first auxiliary guide wire with the main guide wire includes a curved line portion that protrudes in a direction away from the first joint portion side. 2. The first auxiliary guide wire extends from the outer edge line of the first joint, connects with the main guide wire, returns to the outer edge line, and has a shape surrounding the first tear initiation portion. packaging bag. A second tear initiation portion is formed at a second joint facing the first joint,
The tear-inducing weakening line further comprises:
a second auxiliary guide line extending away from the outer edge line side of the second joint, connecting to the main guide line and returning toward the outer edge line;
2. The second auxiliary guide line has a portion of a predetermined range including a connection point with the main guide line as a second specially shaped portion that is a linear groove that is deeper and/or thicker than the main guide line. Or the packaging bag described in 2 . 4. The packaging bag according to claim 3 , wherein the portion of the predetermined range including the connection point of the second auxiliary guide line with the main guide line includes a curved line portion that protrudes in a direction away from the second joint portion. 5. The second auxiliary guide wire extends from the outer edge line of the second joint, connects with the main guide wire, returns to the outer edge line, and has a shape surrounding the second tear initiation portion. packaging bag.

Images