JP2019147568A - Packaging bag - Google Patents

Abstract

To achieve a packaging bag configured so that when the bag is opened by tearing apart an upper part of the bag, the upper part can be surely torn apart at a position and in a direction nearly along a cut line even if a tear-apart line is deviated from a fragile line such as the cut line, and the bag can be easily opened.SOLUTION: The packaging bag has a center easy-unseal break line (30) which has opening starting points, whose one side is set as a starting point and whose other point is set as an ending point, at outer edges of seal parts at both ends inside a side which can be broken to be unsealed. The center easy-unseal break line is formed into an easy-unseal break line (33) with steps which is shifted in different directions, at a front film side and at a rear film side constituting a packaging bag (1), upward or downward, with respect to a straight line connecting left and right unseal-starting points, at the center of the line, which has easy-unseal auxiliary break lines inclined or bent toward the vicinity of a starting part of the step, at left and right sides and at upper and lower sides of the easy-unseal break line with a step and an auxiliary guide break line (43) extended from the vicinities of inclined parts of the left and right steps toward the centers of the steps.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag in which an opening portion of a packaging bag for storing various contents such as liquids, powders and granules easily spreads and the contents can be easily taken out.

In packaging bags that store various contents such as liquids, powders, and granules as contents, even if it is easy to tear and open the top of the bag, open it cleanly, and then expand the opening part It is not easy to take out things easily.
Especially in the dry season when the hands are easy to dry, when an elderly person encounters a situation where such a packaging bag must be opened, it is very difficult to open a thin film left and right. It was.
In this tear-opening property, there has been a demand for a packaging bag in which the tear-opening portion can be cut cleanly from the left end to the right end, and a step can be formed in the tear-opening portion so that it can be easily picked and opened with fingers.

With respect to such a problem, Patent Document 1 includes a laminate having an outer layer, an intermediate layer, and an inner layer having an edge thermal bonding portion at opposite edges,
A first outer layer of the laminate is continuously formed from one outer edge of the edge thermal bonding portion as a starting point and the other outer edge having the same position in the direction parallel to the starting edge and the edge thermal bonding portion as an end point. The first cut line,
A second cut line is formed in the other outer layer of the laminate, with the other outer edge having the same position in the direction parallel to the edge thermal bonding portion as the starting point and the other outer edge as the starting point. And
When the first cut line is assumed to be a virtual straight line connecting a starting point and an end point at a substantially central portion of the packaging bag in a plan view of the packaging bag, the first cut line swells toward the upper end side and the lower end side with respect to the virtual straight line. A packaging bag characterized by being composed of score lines is proposed.

In this packaging bag, the first cut line on one outer layer swells on the upper end side and the cut line swells on the lower end side is determined by the direction of tearing, and it can be surely torn at the cut line. It is effective when possible.
However, since the cut line needs to have a certain strength that can withstand the drop strength of the packaging bag and the storage environment, it cannot always be torn along the cut line.
For this reason, there is a problem that the position to be torn in the middle of the cut line is shifted, and it may be torn at the same position on the front and back sides, or torn in an undesired direction, and is not always easy to open.

JP 2012-96839 A

  Therefore, when the present invention tears and opens the upper part of the packaging bag, even if the tear line deviates from a weak line such as a cut line, it is surely torn in a position or direction substantially along the cut line. It is an object of the present invention to obtain a packaging bag that can be easily opened and the tearing position between the front film and the rear film is shifted so that only one film can be grasped.

The packaging bag of the present invention is a storable packaging bag in which the front film and the rear film overlap the sealant surfaces and seal at least three adjacent sides.
Break the center side to make it an open side,
It has an opening start point on the outer edge of the seal part on both ends of the side that can be opened by breaking,
Each of the front film and the rear film, starting from one opening start point and having the other opening starting point as an end point, has a central easy opening break line,
The center easy-break break line is an easy-open break line with a step that is shifted in a different direction on the front film side and the back film side on the upper or lower side with respect to the straight line connecting the left and right opening start points at the center. ,
On the left and right of the easy-open break line with a step, and on the top and bottom, have an easy-open auxiliary break line that is inclined or bent toward the vicinity of the start of the step,
And it is a packaging bag characterized by having an auxiliary guide breaking line from the inclination part vicinity of a right-and-left level | step difference toward the center of a level | step difference.

The packaging bag of the present invention can be opened with a step difference between the front film and the rear film that is surely shifted up and down, so that the contents can be easily taken out.
In particular, even if it begins to deviate from the center easy-open break line to be opened, even if the position to break at the time of opening is shifted due to the inclined easy-open auxiliary break line or auxiliary guide break line, it is easy to have the original center step. The breaking direction is corrected on the side of the opening break line, and the break position is not significantly shifted.

It is a general view which shows an example of the packaging bag of this invention. It is a figure which shows the opening part vicinity in the packaging bag of this invention. It is a figure which shows the process of opening in the packaging bag of this invention. When tearing and opening the upper part of the packaging bag of this invention, it is a figure which shows the condition which removed from the center breaking line and was torn.

Hereinafter, embodiments of the packaging bag of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view showing an example of a packaging bag according to the present invention.
The packaging bag 1 of the present invention includes a front film 101 made of a laminated film and a rear film 102 overlapped with sealant surfaces, and a top seal portion 11, a left seal portion 12, a right seal portion 13, and a bottom seal portion 14 around the periphery. The packaging bag 1 is provided with a storage portion 10 for storing contents.
An example of the packaging bag 1 shown in FIG. 1 is a standing pouch having a gusset in which the bottom portion is fused with the bottom film 141 and is a packaging bag having self-supporting properties, but it is not necessarily required to be a gusset.

The packaging bag 1 has an opening start point 3 that can be opened by breaking at the outer edges above the left seal part 12 and the right seal part 13.
The unsealing start point 3 is formed by a start point that can be easily triggered by hand, such as a notch, an incision, or a point-like weak part.

Between the left opening start point 31 formed on the left seal part 12 and the right opening start point 32 formed on the right seal part 13, one opening start point is a starting point, and the other opening start point is an end point. A central easy-open break line 30 is formed.
The left and right sides of the center easy-open break line 30 are formed from a horizontal straight line portion parallel to the top seal portion 11 from the opening start point, and at the center, from the straight line L connecting the left and right opening start points upward or downward. The front side and the rear side have stepped easy-open break lines 33 that are shifted in different directions. This step D is preferably 0.25 mm or more. If the level difference is 0.25 mm or more, a difference of 0.5 mm or more is generated between the front side and the rear side, and the front film 101 remaining largely on the upper side or the end of the rear film 102 is hooked to separate the front and rear films. Each film can be easily grasped.
The easy-open break line 33 with a step has an easy-open break line with a central step parallel to the straight line L at the center thereof, and a left inclined line and a right inclined line connecting the steps with the straight line L on the left and right sides thereof.
It is preferable to connect the inclined line and the easy opening break line with the central step, or between the inclined line and the horizontal straight line from the opening start point with a curve as large as possible.

The central easy-open break line 30 has an easy-open break line 33 with a step at the center, and an easy-open auxiliary break that is inclined or bent toward the vicinity of the start of the step on the left and right sides of the easy-open break line 33 with a step. Has a line.
The easy-open auxiliary break line has a long easy-open first auxiliary break line 41 extending from the inside of the range having a step and a short easy-open second auxiliary break line 42 extending from the outside of the range having the step, The front film 101 side and the rear film 102 side are formed in different directions on the upper side or the lower side of the easy-open break line 30, respectively.

  The easy opening first auxiliary breaking line 41 intersects with the central easy opening breaking line 30 with the starting point being one point inside the left and right step slope start point of the easy opening breaking line 33 with a step and the end point before the left and right side seals. It is formed by a slanted line or a bent curve.

  The easy-opening second auxiliary break line 42 is a left and right outside of the easy-open break line 33 with a step of the central easy-open break line 30, the starting point is a point having a height equal to or lower than the step, and the central easy-open break line 30. The left and right directions away from the center easily open break line 30 intersect with the center easy open break line 30 starting from a point outside the left and right side inclined parts of the center easy open break line 30 and starting from a point before the left and right side seals. It is formed by a slanted line or a bent curve.

In addition, this packaging bag has a central step on the left or right side of the step that is shifted from the straight line connecting the left and right opening start points in the separate direction on the front side and rear side on the upper side or the lower side of the central easy-open break line. The auxiliary guide break line 43 is provided on the left and right inner sides of the step side of the easy-open break line.
The starting point of the auxiliary guide break line 43 is a point in the vicinity of the same height as the step, the left-right direction is within the range of the inclined portions on the left and right ends of the center easy-open break line 30, and is separated from the easy-open break line 33 with a step. In addition, a point that is further to the center side than the starting point of the easy-opening second auxiliary breaking line 42 is a starting point.
Further, the end point of the auxiliary guide break line 43 is a point on the center side of the step of the easy-open break line 33 with a step, and an easy-open break line with a step away from the straight line L connecting the left and right opening start points 3. A point at a further distance from the 33 steps is the end point.
The height E, which is further away from the step of the easy-open break line 33 with a step, is substantially the same as the step D.
The auxiliary guide break line 43 is formed between the starting point and the end point by a diagonal line that does not intersect the central easy-open break line or the easy-open assist break line, or a curved line.

The center easy opening break line 30, the easy opening first auxiliary break line 41, the easy opening second auxiliary break line 42, and the auxiliary guide break line 43 are fragile processing lines such as a remelting break line obtained by scanning the base film with a laser beam. Or it forms by the broken line which cut the base film half.
The remelt fracture line scanned with a laser beam can be used for a film based on a biaxially stretched film such as a polyethylene terephthalate film, a polyamide film, or a polypropylene film. The biaxially stretched film is biaxially stretched by scanning and remelting a carbon dioxide laser with a wavelength of 10.6 μm at a power of 20 to 50 watts at a speed of 500 to 5000 mm / sec. It is an easily breakable line that breaks the connection between the two resins.
Such a break line is easily torn along the break line by hand.
In order to perform half-cutting, a blade that is shallower than the cutting blade, such as a big blade or a rotary blade, is applied and a cut is made at a depth less than the thickness of the base film. Of course, it may be a solid line or a broken line.

From the easy-breaking break line to the inside of the packaging bag, a thermoplastic resin occlusion tool 2 made up of a male member of a ridge and a female member of a ridge is placed in front of the straight line connecting the left and right opening start points. The film 101 and the rear film 102 are welded facing each other.
This occlusal tool 2 can occlude a male member and a female member, and when occluded, the front film 101 and the rear film 102 are joined, and the opening portion can be closed and sealed. Even after the tear break line is torn, it can be resealed.
Further, the occlusal tool 2 has a sealant layer on at least one side, and is entirely made of thermoplastic, so that it can be welded to the inner surfaces of the front film 101 and the rear film 102, and both ends overlap the seal portion. In this case, it can be melted and sealed.
It is desirable that the bite 2 has an upper end on the inner side with a distance H from a straight line connecting left and right opening start points separated by 3 mm or more.

FIG. 2-1 is a view of the vicinity of the unsealed portion as seen from the front film side in the packaging bag embodiment of the present invention.
The front center easy-open break line 30 starts from a left opening start point 31 at the left end, and includes a front left center easy-open break line 301 parallel to the top seal 11 in the vicinity of the left seal portion 12.
However, when approaching the easy opening break line 33 with a front step, the front left inclined line 331 is inclined to the upper right.
At the end of the front left inclined line 331, it becomes an easy opening break line 330 with a front center step of a parallel straight line above the height of the step D to the straight line L connecting the left and right opening start points, and further inclined to the lower right. Continuing from the front right inclined line 332, the front right center easy-open break line 302 parallel to the top seal 11 is connected to the right opening start point 32.

In the vicinity of the left and right sides of the easy opening break line 33 with the front step of the front center easy opening break line 30, there is an easy opening auxiliary break line that is inclined or bent toward the vicinity of the start part of the step.
The front easy-opening auxiliary breaking line has a front easy-opening first auxiliary breaking line 41 extending from the vicinity of the straight line L on the left and right inner sides of the easy-opening breaking line 330 with a front center step to the front of the left and right seal parts,
It is composed of an easy-opening second auxiliary breaking line 42 on the front surface extending from near the outside of the left and right inclined lines to the front of the left and right seal portions.

The front left easy opening first auxiliary breaking line 411 forms a step D shifted from the straight line L connecting the front left opening start point 31 and the front right opening start point 32 below the front center easy opening break line 30. Formed around.
The front left easy-opening first auxiliary breaking line 411 intersects the front center easy-opening breaking line 30 starting from one point on the right side that is inside the start point of the front left inclined part 331 of the step and starting from the front of the left side seal 12. Not formed by diagonal lines or curves. As shown in FIG. 2A, the front surface easy opening first auxiliary breaking line 41 is particularly preferably a shape obtained by cutting out a part of an ellipse, and the vicinity of the end point of the easy opening first auxiliary breaking line is substantially parallel to the straight line L. It is preferable that

The front right easy opening first auxiliary breaking line 412 forms a step D shifted from the straight line L connecting the front left opening starting point 31 and the front right opening starting point 32 below the front center easy opening breaking line 30. Formed around.
The front right easy opening first auxiliary breaking line 412 intersects with the front center easy opening breaking line 30 with the starting point as one starting point on the left side which is inside the front right inclined part 332 of the step, and as the ending point before the right side seal 13. Not formed by diagonal lines or curves.

The front left easy-opening second auxiliary breaking line 421 forms a step D shifted from the straight line L connecting the front left opening start point 31 and the front right opening start point 32 above the front center easy opening break line 30. It is formed around the left side.
The front left easy-opening second auxiliary breaking line 421 is a point whose starting point is a height below the step on the left side outside the step of the easy-opening breaking line 330 with the front center step, and from the front center easy-opening breaking line 30 The left and right direction is a diagonal line or curve that does not intersect the front center easy-open break line 30 starting from a point outside the front left slope 331 or outside the left and right slopes, and ending 12 before the left side seal. Is formed. As shown in FIG. 2A, the front opening second auxiliary breaking line 42 is particularly preferably a shape obtained by cutting out a part of an ellipse, and the vicinity of the end point of the easy opening second auxiliary breaking line is substantially parallel to the straight line L. It is preferable that

The front right easy-opening second auxiliary breaking line 422 is formed on the upper side of the front center easy-opening breaking line 30 and forms a step D shifted from a straight line L connecting the left opening start point 31 and the right opening start point 32. Formed around.
The front right easy-opening second auxiliary breaking line 422 is a point whose starting point is the height below the step on the right outside of the step side of the easy-opening breaking line 330 with a front center step, and from the front center easy-opening breaking line 30 The left and right direction is a diagonal line or curve that does not intersect the front center easy-open break line 30 starting from a point outside the front right slope part 332 or outside the left and right slope parts, and 13 points before the right side seal. Is formed.

The front left auxiliary guide break line 431 is on the left side of the step side shifted from the straight line connecting the left and right opening start points above the central easy-open break line.
The starting point of the front left auxiliary guide break line 431 is a point in the vicinity of the same height as the step D, the left-right direction is a point away from the center easy-open break line 30 within the left inclined portion 331 range, and the front surface The starting point is a point farther to the center than the starting point of the second easy-opening second auxiliary breaking line 421.
The end point of the front left auxiliary guide break line 431 is a point on the center side of the step of the easy-open break line 330 with a step, and the easy-open with a step away from the straight line L connecting the left and right opening start points 3. A point that is further away from the step D of the breaking line 330 is the end point.
The height E, which is further away from the step D of the easy-open break line 330 with a step, is substantially the same as the step D.
The front left auxiliary guide break line 431 is formed by a diagonal line or a curve that does not intersect the center easy-open break line 30 or the easy-open assist break line between the start point and the end point.
In the vicinity of the end point of the front left auxiliary guide break line 431, it is preferable to be substantially parallel to the stepped central easy-open break line 330.

The front right auxiliary guide break line 432 is on the right side of the step side shifted from the straight line connecting the left and right opening start points above the center easy-open break line.
The starting point of the front right auxiliary guide break line 432 is a point in the vicinity of the same height as the step D, and the left-right direction is a point away from the center easy-open break line 30 within the range of the right inclined portion 332, and the front surface The starting point is a point farther to the center than the starting point of the right easy opening second auxiliary breaking line 422.
Further, the end point of the front right auxiliary guide break line 432 is a point on the center side of the step of the easy-open break line 330 with a step, and the easy-open with a step away from the straight line L connecting the left and right opening start points 3. A point that is further away from the step D of the breaking line 330 is the end point.
The height E of the end point further away from the step D of the easy-open break line 330 with the step is substantially the same height as the step D.
The front right auxiliary guide break line 432 is formed between the starting point and the end point by a diagonal line or a curve that does not intersect the central easy-open break line 30 or the easy-open assist break line.
The auxiliary guide break line 43 also has a particularly preferable shape obtained by cutting a part of an ellipse.
Even in the vicinity of the end point of the front right auxiliary guide break line 432, it is preferable that the front right auxiliary guide break line 432 is substantially parallel to the stepped central easy-open break line 330.

The top seal portion 11 that is the openable side having the front center easy-open break line 30 and the straight line L that connects the left and right opening start points, and inside the front center easy-open break line 30, A synthetic resin-made occlusal tool 2 including a male member and a concave female member is provided.
The distance H at which the bite 2 is separated from the straight line L connecting the left and right opening start points is preferably 3 mm or more.
When the distance H is less than 3 mm, an excessive force is applied to the welded portion of the welded bite 2 and the packaging bag 1 when tearing the packaging bag 1 from the opening start point along the central easy-opening break line, and the vicinity of the boundary There is a risk of breaking the bag.

FIG. 2-2 is a view of the vicinity of the unsealed portion viewed from the rear film 102 side in the packaging bag embodiment of the present invention.
The rear center easy-open break line 300 starts from the right opening start point 32 at the left end, and includes a rear left center easy-open break line 303 parallel to the top seal 11 in the vicinity of the right seal portion 13.
However, when approaching the easy-open break line 34 with a rear surface step, a rear left inclined line 341 inclined downward to the right is obtained.
At the end of the rear left inclined line 341 is an easy-open break line 340 with a central step on the rear surface parallel to the straight line L below the level of the step D to the straight line L connecting the left and right opening start points. Continuing from the right inclined line 342, it becomes a rear right center easy opening break line 304 parallel to the top seal 11, and is connected to the left opening start point 31.

In the vicinity of the left and right easy opening break lines 34 with the rear surface step difference of the rear center easy opening break line 300, there is an easy opening auxiliary breaking line that is inclined or bent toward the vicinity of the start portion of the step.
The easy opening auxiliary break line includes an easy opening first auxiliary break line 41 extending from the vicinity of the straight line L side on the left and right sides of the easy opening break line 340 with a center step on the rear surface to the front of the left and right seal parts,
An easy-opening second auxiliary breaking line 42 that extends from near the outside of the left-right inclined line to the front of the left-right seal part.

The rear left easy-opening first auxiliary breaking line 413 is formed on the upper side of the rear center easy-opening breaking line 300 and forms a step D shifted from a straight line L connecting the left opening start point 31 and the right opening start point 32. Formed.
The rear left easy-opening first auxiliary breaking line 413 has a starting point on the right side of the rear left inclined part 341 of the step and on the right side seal 13 starting from one point inside the easy-opening breaking line 340 left step inclined starting point with the rear center step. It is formed by a diagonal line or a curve that does not intersect the rear surface center easy-open break line 300 with the near end as the end point. As for the rear surface, the easy-opening first auxiliary breaking line 41 is particularly preferably a shape obtained by cutting out a part of an ellipse.
Moreover, it is desirable that the end point of the easy-open first auxiliary break line 41 on the rear surface be the same height as the end point of the easy-open second auxiliary break line 42 on the front surface.

The rear right easy opening first auxiliary breaking line 414 forms a step D shifted from the straight line L connecting the left opening starting point 31 and the right opening starting point 32 above the rear center easy opening breaking line 300. Formed.
The rear side right easy-opening first auxiliary breaking line 414 starts on the left side of the rear right slope part 342 of the step and is located on the left side seal 12 starting from a point inside the right step slope starting point of the easy-opening breaking line 340 with the rear center step. It is formed by a diagonal line or a curve that does not intersect the rear surface center easy-open break line 300 with the near end as the end point.

The rear left easy opening second auxiliary breaking line 423 forms a step D shifted from the straight line L connecting the left opening start point 31 and the right opening start point 32 below the rear center easy opening break line 300. Formed around the left side.
The rear left easy-opening second auxiliary breaking line 423 is a point where the starting point is a step side left outer side of the easy-opening breaking line 340 with a rear center step and a height equal to or lower than the step, and from the rear center easy-opening breaking line 300 The left and right directions that are separated are diagonal lines or curves that do not intersect the rear center easy-open break line 300, starting from a point outside the rear left inclined portion 341 or outside the right and left both end inclined portions, and 13 points before the right side seal. Is formed. The opening second auxiliary breaking line 42 on the rear surface is particularly preferably a shape obtained by cutting off a part of an ellipse.

The rear right easy opening second auxiliary breaking line 424 forms a step D shifted from the straight line L connecting the left opening start point 31 and the right opening start point 32 below the rear center easy opening break line 300. It is formed around the right side.
The rear right easy-opening second auxiliary break line 424 is a point whose starting point is a height equal to or lower than the step on the right side of the step side of the easy-open break line 340 with a rear center step, and from the rear center easy-open break line 300. The left-right direction is a diagonal line or curve that does not intersect the rear-side center easy-open break line 300, starting from a point outside the right-side inclined part 342 or outside the right-and-left both-side inclined part, and ending 12 points before the left side seal. Is formed.

The rear left auxiliary guide break line 433 is provided below the rear center easy-open break line 300 on the left side of the step side shifted from the straight line connecting the left and right opening start points.
The starting point of the rear left auxiliary guide break line 433 is a point in the vicinity of the same height as the step D, the left-right direction is a point away from the center easy-open break line 300 within the rear left inclined portion 341 range, and The starting point is a point farther to the center than the starting point of the rear left easy-opening second auxiliary breaking line 423.
Further, the end point of the rear left auxiliary guide break line 433 is a point on the center side of the step of the easy-open break line 340 with a rear step, and has a rear step away from the straight line L connecting the left and right opening start points 3. A point further away from the step D of the easy-open break line 340 is the end point.
The height E, which is further away from the step D of the easy-open break line 340 with the rear step, is substantially the same as the step D.
The rear left auxiliary guide break line 433 is formed between the start point and the end point by a diagonal line or a curve that does not intersect the rear center easy open break line 300 or the easy open assist break line. In the vicinity of the end point of the rear left auxiliary guide break line 433, it is preferable to be substantially parallel to the central easy-open break line 340 with a rear step.

The rear right auxiliary guide break line 434 is provided below the rear center easy-open break line 300 on the right side of the step side shifted from the straight line connecting the left and right opening start points 3.
The starting point of the work surface right auxiliary guide break line 434 is a point in the vicinity of the same height as the step D, and the left-right direction is a point away from the rear center easy-open break line 300 within the rear right inclined portion 342, and The starting point is a point farther to the center than the starting point of the rear right-side easy-opening second auxiliary breaking line 424.
In addition, the end point of the rear right auxiliary guide break line 434 is a point on the center side of the step of the easy-open break line 340 with a rear step, and has a rear step away from the straight line L connecting the left and right opening start points 3. A point further away from the step D of the easy-open break line 340 is the end point.
The height E of the end point further away from the step D of the easy-open break line 340 with the rear step is set to be substantially the same as the step D.
The rear right auxiliary guide break line 434 is formed between the starting point and the end point by a diagonal line or curve that does not intersect the rear center easy-open break line 300 or the easy-open assist break line. Even in the vicinity of the end point of the front right auxiliary guide break line 432, it is preferable that the front right auxiliary guide break line 432 is substantially parallel to the stepped central easy-open break line 330.

FIG. 3 is a diagram showing a process of opening the packaging bag of the present invention.
FIG. 3A is a front center easy opening break line 30 starting from the left opening start point 31 and the right opening start point 32.
FIG. 5 is an upper view of the upper portion of the packaging bag 1 as viewed from the rear film 102 side, showing a state in which the upper portion of the packaging bag 1 is torn along the rear center easy-open break line 300 and the top seal 11 side is removed.
The front center easy-open break line 30 is a break line having a step at the center on the upper side, while the rear center easy-open break line 300 is a break line having a step at the center. Is shown as a difference in height between the front film 101 and the rear film 102 that appear torn.
Moreover, even if the top seal side is torn and opened in this way, it can be resealed by having the bite 2 inside.

FIG. 3-2 is a cross-sectional view when the center of the packaging bag of FIG. 3-1 is cut in the vertical direction.
The opening portion of the torn packaging bag has a difference in height that is twice as high as the step D with respect to the front end of the front film 101 with respect to the front end of the rear film 102 and has a sufficient level difference.
Below the torn opening portion, the bite 2 is engaged and sealed.

  FIG. 3-3 shows that the front film 101 has sufficiently protruded from the rear film 102, so that the front and rear films are separated by hooking the end of the protruding step with a finger. The process of grabbing is shown.

FIG. 3-4 shows a state in which the gap between the front film 101 and the rear film 102 facing it is sufficiently widened and the male and female of the bite 2 are peeled off and opened.
The synthetic resin bite 2 used is composed of a convex male member and a concave female member, and can be resealed simply by pressing the male member and female member against each other and engaging them.

FIG. 4 shows a case in which, in the step of opening the packaging bag of the present invention, the upper part of the packaging bag is torn with the right opening start point 32 as the opening start point, and the actually broken line is torn away from the rear center break line. It is a figure which shows an example.
The tear line 5 that is torn with the right opening start point 32 as the opening start point is torn along the rear left center easy-break line 303, then bends along the easy break line, and is torn along the rear left slope line 341. However, it is an example in which the rear left slope line 341 is not bent in the direction of the rear surface center stepped easy-open break line 340 but is torn in the extending direction of the rear left slope line 341 as it is.
Even in this case, the tear line 5 torn in the extending direction from the end point of the rear left slope line 341 reaches the rear left auxiliary guide break line 433 positioned in the extension direction of the rear left slope line 341, and the tear line 5 is Here it is bent horizontally.
After that, when the tear line 5 is torn toward the easy opening break line 340 with the rear center step and reaches the easy opening break line 340 with the rear center step, along the easy opening break line 340 with the rear center step in the horizontal direction. Torn.
The tear line 5 is bent to the rear surface right inclined line 342 at the end point of the easy opening break line 340 with the center step on the rear surface. Thereafter, the tear line is usually torn along the central break line.
However, the tear line 5 may be disconnected in the horizontal direction in the middle of the rear right inclined line 342. Even in this case, the rear right-side easy-opening second auxiliary breaking line 424 is bent in the horizontal direction and is not torn apart in a significantly shifted direction, and reaches the end of the left seal portion 12. At this time, the rear right easy-opening second auxiliary breaking line 424 is close to the front left easy-opening first auxiliary breaking line 411 on the front surface, and the front film 101 is torn along the front left inclined line 331. An example has been described in which the line 51 is torn in the direction of the extended line at the end point, connected to the front left easy-opening first auxiliary breaking line 411, and may be bent horizontally.

The break lines for opening such as the center easy-open break line, easy-open first auxiliary break line, easy-open second auxiliary break line, and auxiliary guide break line are scanned with a laser beam or half-cut with a bi-blade. Or formed from a fragile line that can be partially broken.
As the laser beam to be scanned, a gas laser such as a carbon dioxide laser or a nitrogen laser, or a solid laser such as a ruby laser or a YAG laser can be used. If the biaxially stretched layer is heated and re-melted and is in an unstretched state, it will break easily, and is heated to a temperature equal to or higher than the crystallization temperature, preferably near the melting point.
Scanning a laser beam to process easily breakable lines can be performed at a very high speed, so that productivity is high and processing is possible at low cost.
In the case of half cut, it is preferable that the base material layer is half cut up to the front of the sealant layer. When using a metal foil, the metal foil is easy to break, so half-cut to the upper end of the metal foil.
The easy-breaking break line can be broken even with a single processing line, but it may be an easy-opening break line with a plurality of parallel weak lines.

  The basic structure of the laminated film constituting the packaging bag of the present invention may be a film composed of a base material layer on the outside and a sealant layer on the inside, but as an intermediate layer, a barrier layer that improves the storage stability of the contents In addition, it is preferable to provide a layer that gives flexibility such that the bag is not easily broken when dropped.

  Examples of the base material layer include a polyester film, a polypropylene film, a polystyrene film, a nylon film, a polycarbonate film, a polyacrylonitrile film, and a polyimide film. There is no particular limitation as long as it has mechanical strength and dimensional stability. A biaxially stretched film is particularly preferable. Moreover, what provided the aluminum vapor deposition layer in these films may be used.

  Moreover, a printing layer can be suitably provided in a base material layer as needed. The printed layer is a layer printed with an ink obtained by adding various pigments, extender pigments, plasticizers, drying agents, stabilizers and the like to a binder resin such as urethane, acrylic, nitrocellulose, or rubber. As the printing method, for example, known printing methods such as offset printing, gravure printing, flexographic printing, silk screen printing, and ink jet printing can be used. Moreover, the adhesiveness of a printing layer can be improved by performing the corona treatment or the ozone treatment on the surface of a base material layer as a pretreatment beforehand.

  As the sealant layer, polyolefin resin is generally used. Specifically, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer (EVA), Polyolefin resins such as ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, and polypropylene can be used. These resins can be formed into a film by an extruder. It may be a single layer or multiple layers. The thickness of the film is preferably in the range of 40 to 200 μm.

  As the adhesive layer, an adhesive for dry lamination can be used. For example, a two-component curable urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, and the like can be used. . As a bonding method, a dry laminating method can be used, but the lamination may be performed while forming a film on the sealant layer side by extruder lamination, or may be processed by sand polyethylene.

  Also, if it is necessary to improve the physical properties of the laminated sheet, for example, when improving the rigidity, drop strength, puncture strength, etc. of the laminated sheet, when improving the barrier properties such as water vapor or oxygen gas, etc. It is also possible to provide a layer. However, it is desirable that the material be easily fragile or easily breakable by processing the easy-opening processing line.

  As an intermediate | middle layer, aluminum foil, an aluminum vapor deposition polyester film, an inorganic oxide vapor deposition polyester film, a polyamide resin etc. can be used, for example. Moreover, in order to laminate | stack an intermediate | middle layer, it can bond together by the dry lamination method through an contact bonding layer.

  As the inorganic oxide, metal oxides such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, and yttrium oxide can be used. . Of these, silicon oxide, aluminum oxide, magnesium oxide and the like are preferable from the viewpoint of productivity and price.

The packaging bag of the present invention is as described above, and the tearing position between the front film and the rear film is made to be a packaging bag that can be easily opened by adding a step that is securely shifted up and down, and the contents can be easily taken out. Can do.
In particular, even if the tear position deviates from the center easy-open break line to be opened, the break direction is corrected toward the center easy-open break line by the easy-open auxiliary break line and the auxiliary guide break line provided on the top, bottom, left and right. It can be opened at the break line position with a central step without breaking the position where it breaks remarkably, and it can be processed with a high-speed laser beam, so it is highly productive and can be opened without excessive costs. Can be improved.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 10 ... Storage part 101 ... Front film 102 ... Rear film 11 ... Top seal part 12 .... Left side seal 13 ... Right side seal 14 ... Bottom seal 141 ... Bottom film 2 ...・ Occlusal tool 3 ... opening start point 30 ... center easy opening break line 300 ... rear center easy opening break line 301 ... front left Center easy opening break line 302... Front right center easy opening break line 303... Rear left center easy opening break line 304... Rear right center easy opening break line 31. ...... Left opening start point 32 ... Right opening start point 33 ... Easy opening break line 330 with a step ... Opening break line 331... Front left slope line 332... Front right slope line 34... Easy opening break line 341... Rear left slope line 342... Rear right slope line 41... Easy opening first auxiliary break line 411. Opening first auxiliary breaking line 412... Front right easy opening first auxiliary breaking line 413... Rear left easy opening first auxiliary breaking line 414... Rear right right opening first 1 auxiliary breaking line 42... Easy opening second auxiliary breaking line 421 .. front left easy opening second auxiliary breaking line 422... Front right easy opening second auxiliary breaking line Line 423 ... Rear left easy opening second auxiliary breaking line 424 ... Rear right easy opening second auxiliary breaking line 43 ... Auxiliary guide break line 431... Front left auxiliary guide break line 432... Front right auxiliary guide break line 433... Rear left auxiliary guide break line 434. Rear right auxiliary guide break line 5 ... tear line D ... step (step between straight line L and easy-open break line with center step)
E ... height (height of auxiliary guide line end point from easy-open break line with step)
L ... Straight line (straight line connecting left and right opening start points)
H ・ ・ ・ ・ ・ ・ ・ ・ Distance (distance between the upper end of the bite and the straight line L)

Claims (9)

In the storable packaging bag in which the front film and the rear film overlap the sealant surfaces and seal at least three adjacent sides,
Break the center side to make it an open side,
It has an opening start point on the outer edge of the seal part on both ends of the side that can be opened by breaking,
Each of the front film and the rear film, starting from one opening start point and having the other opening starting point as an end point, has a central easy opening break line,
The center easy-break break line is an easy-open break line with a step that is shifted in a different direction on the front film side and the back film side on the upper or lower side with respect to the straight line connecting the left and right opening start points at the center. ,
On the left and right of the easy-open break line with a step, and on the top and bottom, have an easy-open auxiliary break line that is inclined or bent toward the vicinity of the start of the step,
And the packaging bag characterized by having an auxiliary guide broken line toward the center of a level | step difference from the inclination part vicinity of a right-and-left level | step difference.   In the center of the center easy-open break line, on the upper side or the lower side, the step shifted from the straight line connecting the left and right opening start points in the different directions on the front film side and the rear film side is set to 0.25 mm or more. The packaging bag according to claim 1, wherein the packaging bag is characterized. On the upper side or the lower side of the center easy-open break line, in a different direction on the front side and the rear side, around the step that deviates from the straight line connecting the left and right opening start points,
Has an easy opening first auxiliary break line inside the left and right both-side inclined part of the step,
The easy opening first auxiliary breaking line is a diagonal line that does not intersect the central easy opening breaking line, starting from one point inside the right and left step inclination starting point of the easy opening breaking line with a central step and ending before the left and right side seals Or the packaging bag of Claim 1 or 2 currently formed with the curve. On the upper or lower side of the center easy-open break line, on the left and right sides of the step side shifted from the straight line connecting the left and right opening start points in different directions on the front side and the rear side,
It has an easy opening second auxiliary breaking line on the left and right outside of the step side of the easy opening breaking line with a center step,
The easy opening second auxiliary break line is a point whose starting point is a height equal to or less than a step, and the left-right direction away from the central easy-open break line is within the range of the left and right both-end inclined parts, or outside the left and right both-end inclined parts The packaging bag according to any one of claims 1 to 3, wherein the packaging bag is formed with diagonal lines or curves that do not intersect the central easy-open break line, starting from this point and starting from the front of the left and right side seals. . On the upper or lower side of the center easy-open break line, on the left and right sides of the step side shifted from the straight line connecting the left and right opening start points in different directions on the front side and the rear side,
Has an auxiliary guide break line on the left and right inside of the step side of the easy-open break line with a center step,
The auxiliary guide break line is a point in the vicinity of the same height as the step, the left-right direction is a point away from the center easy-open break line in the range of the inclined portions on both left and right sides, and the easy-open second auxiliary break Start from a point that is further to the center than the starting point of the line,
The end point is a point on the center side of the step of the easy-open break line with a step, and the end point is a point further away from the straight line connecting the left and right opening start points from the easy-open break line with the step,
The packaging bag according to any one of claims 1 to 4, wherein the packaging bag is formed by a diagonal line or a curve that does not intersect the central easy-open break line or the easy-open auxiliary break line.   The center easy-open break line, easy-open auxiliary break line, easy-open second auxiliary break line, and auxiliary guide break line are all remelt break lines obtained by scanning the substrate film with a laser beam. The packaging bag in any one of -5.   The center easy-open break line, easy-open auxiliary break line, easy-open second auxiliary break line, and auxiliary guide break line are all break lines obtained by half-cutting the base film. A packaging bag according to any one of the above. On one side that can be opened with a central easy-open break line,
It is parallel to a straight line connecting the left and right opening start points, and has a male joint member made of a synthetic resin made up of a male member with a convex line and a female member with a concave line inside the center easy opening break line, The packaging bag according to any one of claims 1 to 7, wherein the bag can be resealed by engaging a female member. On one side that can be opened with a central easy-open break line,
The packaging bag according to claim 8, wherein the occlusion device is provided on the inner side separated by 3 mm or more from a straight line connecting the left and right opening start points.

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