JP7122164B2 - food packaging bag - Google Patents

Description

The present invention relates to a food packaging bag for packaging food.

A food packaging bag for packaging food such as sandwiches, which has triangular (mainly right-angled triangular) or similar side shapes and is finished in a three-dimensional shape having a predetermined thickness or width, is shown in FIG. The form shown is common, and the new one described in Patent Document 1 is known.

Such a food packaging bag 1' is formed by superimposing a pair of sheets 2' and 3' having a shape in which the other end side is wider than one end side, and a top joint portion 11' on one end side and side joint portions on both side edges. It has a bag body 10' whose three sides are sealed by 12', 12' and the other end side serves as an opening 13'. Thus, notches 14', 14' are formed.

Also, for producers who require a large number of food packaging bags due to the large quantity of food produced, as shown in FIG. 31' are connected, and in a state in which a plurality of food packaging bags 1', . . . Generally, a plurality of food packaging bags 1', . . . are bundled and provided.

When packaging food, as shown in FIG. 11(a), pins P are passed through insertion holes 33' formed in tabs 31', and the bundle is set in a packaging device (not shown). Next, a blower (not shown) blows air at a predetermined pressure into the bag body 10' from the opening 13', or a suction head (not shown) sucks the opening 13' side of the front sheet 2'. The opening 13' is opened, for example, by lifting. Then, in this state, the food F is inserted into the bag main body 10'.

After the food F is accommodated in the bag body 10', the food packaging bag 1' is separated from the bundle as shown in FIG. When the food F is accommodated in the bag body 10', the shape of the opening 13' becomes rectangular or substantially rectangular, and the side joints 12' of the front sheet 2' and the back sheet 3'. A pair of triangular or substantially triangular side surface portions 10A' facing each other, a middle portion of the front sheet 2' forming a rectangular or substantially rectangular front portion 10B', and a middle portion of the back sheet 3' becomes a rectangular or substantially rectangular back portion 10C'.

After the food F is accommodated in the bag body 10', as shown in FIG. Fold the sheet piece 3' so as to cover the bottom surface of the food F, and then, as shown in FIG. Next, as shown in FIG. 2(b), the other sheet piece on either side is folded so as to overlap the previously folded back sheet 3', and then the remaining front sheet 2 is folded. ' is folded so that it overlaps the left and right sheet pieces that were previously folded.

After closing the opening 13' of the food packaging bag 1' by folding the excess sheet piece of the opening 13', as shown in FIG. The part 13' is sealed. This completes the food package.

JP 2017-171326 A

However, in the conventional food packaging bag, when the opening 13' is opened or while the opening 13' is opened, the opening 13' side of the front sheet 2' is lifted, so that the front sheet 2' faces upward. When the force is applied, as shown in FIG. 13, a tensile force T acts particularly on the end point 12a' of the side joint portion 12' which is the boundary between the front sheet 2' and the back sheet 3'. Since the side joint 12' is usually a fusion seal, it is a linear seal and the joint strength is not high. Therefore, when the tensile force T acts on the end point 12a' of the side joint portion 12', there is a problem that the side joint portion 12' is peeled therefrom and split.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a food packaging bag in which the side joints are less likely to be split even when the opening is opened.

The food packaging bag according to the present invention is
A bag body in which a pair of sheets having a shape in which the other end side is wider than one end side is overlapped, and three sides are sealed by the top joint portion on one end side and the side joint portions on both side edges, and the other end side becomes an opening. In a food packaging bag comprising
The bag body has cutouts at the corners of the opening,
The notch is
A first contour line starting from an end point of the side joint formed by the notch, sloping toward the one end side of the bag body, and the first contour at the end point of the side joint a first contour line having an intersection angle of 2 degrees or more and 25 degrees or less between a tangent line of the line and a line in the width direction of the bag body at an end point of the side joint;
A second outline starting from the end point of the first outline and recessed toward one end of the bag body, the line extending from the normal line of the side edge of the bag body in contact with the second outline to the other end of the bag body. A second profile line in which the maximum protrusion amount of the convex portion protruding to the side is 10 mm or less ;
A third outline starting from the end point of the second outline and ending at the intersection with the opening edge of the opening of the bag body, the third outline sloping toward the center line in the width direction of the bag body. and a third contour line in which the distance from the end point of the third contour line to the center line is 150 % or more and 250% or less of the distance from the end point of the top joint to the center line.
Further, as one aspect of the food packaging bag according to the present invention, the crossing angle is 2 degrees or more and 15 degrees or less, the maximum protrusion amount is 8 mm or less, or the side joint portion A width of 1 mm or less can be adopted.

According to such a configuration, the tensile force generated in the opening when the opening is opened or while the opening is open acts mainly on the outline of the notch. less effective. Therefore, even if the opening is opened, no force for peeling the side joints acts on the end points of the side joints, and the side joints are less likely to split.

Further, as another aspect of the food packaging bag according to the present invention, an extra sheet piece that protrudes from the bottom surface of the food when the food is contained in the bag body is folded so as to cover the bottom surface of the food. Among the overlapping portions of the sheet piece of one of the pair of sheets and the sheet piece that is not yet folded, the portions near the left and right edges of the bottom surface of the food are joined. can be done.

As described above, according to the food packaging bag of the present invention, by making the outline of the notch into the above shape, the tensile force generated in the opening when the opening is opened or while the opening is open is less likely to act on the end points of the side joints, it is possible to preferably prevent the side joints from tearing when the opening is opened.

FIG. 1 is an exploded perspective view of a food packaging bag according to an embodiment of the present invention. FIG. 2 is a front view of the food packaging bag. FIG. 3 is a rear view of the food packaging bag. FIGS. 4(a) and 4(b) are enlarged views of notches formed at the corners of the opening of the food packaging bag, and FIG. 4(c) is a header portion and It is an enlarged view of an opening. FIG. 5 is an enlarged view of the notch with the opening of the food packaging bag opened. 6(a) to (i) are enlarged views of the notch with the opening of the food packaging bag opened, showing different angles of the first outline of the notch. FIGS. 7A to 7C are perspective views of the opening of the food packaging bag in a state where the sheet pieces of the back sheet are folded. FIGS. 8A to 8C are enlarged views of openings of food packaging bags according to other embodiments. FIG. 9 is a front view of a conventional food packaging bag. FIG. 10 is a perspective view of a bundle formed by bundling a plurality of the food packaging bags. FIGS. 11(a) to 11(c) are explanatory views of the process of packaging food using the same food packaging bag. FIGS. 12A to 12D are explanatory diagrams continued from FIG. 11. FIG. FIG. 13 is an enlarged view of the cutout portion of the food packaging bag with the opening portion opened.

Hereinafter, as one embodiment of the food packaging bag according to the present invention, a food packaging bag used for packaging sandwiches will be described with reference to FIGS. 1 to 7. FIG.

As shown in FIGS. 1 to 3, the food packaging bag 1 according to the present embodiment includes a pair of sheets (a front sheet 2 and a back sheet 3) having a shape in which the other end side is wider than the one end side. A bag body 10 sealed on three sides by a top joint portion 11 on one end side and side joint portions 12, 12 on both side edges, and an opening portion 13 on the other end side, and a top joint portion of a pair of sheets 2, 3 and a header portion 17 composed of a pair of protruding pieces protruding from 11 .

The front sheet 2 is made of a heat-sealable plastic sheet such as polyethylene or polypropylene. and a tip portion 21 (which becomes the projecting piece).

The back sheet 3 is also made of a heat-sealable plastic sheet such as polyethylene or polypropylene. and a tip portion 31 (which becomes the projecting piece).

In this embodiment, the body portions 20 and 30 are trapezoidal or substantially trapezoidal, and the tip portions 21 and 31 are rectangular or substantially rectangular. Therefore, one end of the body portions 20 and 30 (and the other end of the corresponding tip portions 21 and 31) is perpendicular to the direction from one end side to the other end side (hereinafter referred to as “longitudinal direction”). It is linear, in other words, it is linear parallel to the direction orthogonal to the longitudinal direction (hereinafter referred to as "width direction"), and both side edges of the body portions 20 and 30 are straight lines inclined with respect to the longitudinal direction. Both side edges of the tip portions 21 and 31 are linear parallel to the longitudinal direction, except that the other end side of the side edges of the body portions 20 and 30 is cut off by the notch portion 14 and The other end sides of the portions 20 and 30 are narrowed by the notch portion 14 .

The top joint 11 is formed by heat sealing the front sheet 2 and the back sheet 3 along one edge of the bodies 20,30. The side joints 12 are formed by heat-sealing the side edges (diagonal sides) of the body parts 20 and 30 and the side edges (vertical sides) of the tip parts 21 and 31 . However, while the top joint 11 is formed by welding using a heat seal bar, for example, to form a belt-shaped seal having a predetermined width in the longitudinal direction, the side joint 12 is formed by fusing. By forming, it becomes a line seal. Specifically, the top joint 11 has a width of several millimeters or more, while the width of the side joint 12 is 1 mm or less.

The interior of the bag body 10 constructed in this manner serves as a food storage portion, and the inner sheet 4 is adhered to the inner surface of the front film 2 of the bag body 10 . The inner sheet 4 is, for example, joined at two other ends by point seals (joints 22), and one end is a free end. As a result, even if the food moves in the storage part, the inner sheet 4 adheres to the surface of the food and follows the movement, so that the front sheet 2 is not soiled and the appearance is not spoiled.

A cut line 32 is formed on the inner surface of the back sheet 3 in the header portion 17 . The cut line 32 is formed in a U shape, a semicircle, a V shape, an X shape, a cross shape, a - shape, etc. by a full cut line, a half cut line (half cut), a perforation, etc., and the cut line 32 is formed to open the package. A knob portion 33 is formed as a starting point. An unsealing guide means 5 is provided from the knob portion 33 to the other end side of the back sheet 3 . The unsealing guide means 5 is, for example, a cut tape attached to the inner surface of the back sheet 3, a pair of half cuts, threads, or the like. Thus, by pulling down the knob 33, the unsealing guide means 5 can cut the back sheet 3 at a predetermined width and unseal it.

A notch 14 is formed at a corner of the opening 13 . The cutout portion 14 removes the side joint portion 12 to enhance the separability of the front sheet 2 and the back sheet 3 at the opening portion 13 and facilitates the opening operation of the opening portion 13 .

As shown in FIG. 4, the notch 14 has a first outline 14A starting from an end point 12a of the side joint 12 formed by the notch 14 and an end point 14a of the first outline 14A. and the end point 14b of the second outline 14B, the opening edge of the bag body 10 (the edge of the opening 13 along the width direction (direction orthogonal to the longitudinal direction)) It is composed of a third outline 14C whose end point 14c is the intersection with 13A.

Strictly speaking, the front sheet 2 and the back sheet 3 have different lengths in the longitudinal direction, and the back sheet 3 is slightly longer. Therefore, the opening edge 13A of the back sheet 3 protrudes from the opening edge 13B of the front sheet 2 (see FIG. 1(c)). In this embodiment, the third outline 14C will be described in relation to the opening edge 13A, which is the longer opening edge.

As shown in FIG. 4A, the first outline 14A is a tangent T1 of the first outline 14A at the end point 12a of the side joint 12 (since the first outline 14A is a straight line, the tangent T1 is 1) and the line H1 extending in the width direction (the direction orthogonal to the longitudinal direction) form an acute crossing angle θ1. The crossing angle θ1 is set within a range of 2 degrees or more and 50 degrees or less for the reason described later.

As with the first outline 14A, the second outline 14B includes a tangent (not shown) to the second outline 14B at the end point 14a of the first outline 14A and a width direction (a direction orthogonal to the longitudinal direction). ) is a line that makes an acute crossing angle with a line (not shown) extending from . The third outline 14C is a tangent T2 of the third outline 14C at the end point 14b of the second outline 14B (the third outline 14C is a straight line, so the tangent T2 coincides with the third outline 14C). ) and the line H1 extending in the width direction (the direction perpendicular to the longitudinal direction), the crossing angle θ2 is an acute angle.

The first outline 14A is a straight line as described above. The second outline 14B is a line concave toward one end of the bag body 10 from the line H1 passing through the end point 12a of the side joint 12 and extending in the width direction (direction perpendicular to the longitudinal direction). A curve with a radius of curvature. The third outline 14C is a straight line as described above. The second outline 14B is recessed toward one end of the bag body 10 from the normal line P2 of the side edge of the bag body 10 passing through the end point 12a of the side joint 12, as shown in FIG. It is a line.

The first outline 14A is the maximum distance from the normal P1 of the side edge of the bag body 10 that contacts the second outline 14B to the first outline 14A (that is, the side most distant from the normal P1). The distance L1 from the end point 12a of the joint 12 to the normal P1, in other words, the maximum amount of protrusion L1 of the protrusion 15 that protrudes from the normal P1 toward the other end of the bag body 10 is set to fall within a predetermined range. be done. In this embodiment, the maximum distance or maximum protrusion amount L1 is 10 mm or less, more preferably 8 mm or less.

As shown in FIG. 4C, the inclination (crossing angle θ2) of the third outline 14C defines the width W2 of the opening edge 13A. For reasons described later, the inclination (crossing angle θ2) of the third outline 14C is determined by the distance between the end points 14c, 14c of the pair of left and right third outlines 14C, 14C (that is, the width W2 of the opening edge 13A). ) is 130% or more, more preferably 150% or more, of the distance (that is, the width W1 of the top joint 11) between the end points (intersecting points with the side joints 12) 11a of the top joint 11. is set to be 250% or less, more preferably 230% or less.

In other words, the inclination (crossing angle θ2) of the third outline 14C is the distance from the end point 14c of the third outline 14C to the center line CL in the width direction of the food packaging bag 1 (that is, the opening edge 13A 1/2 of the width W2 of the top joint 11) is 130% or more of the distance from the end point 11a of the top joint 11 to the center line CL (that is, 1/2 of the width W1 of the top joint 11), more preferably 150% It is set so as to fall within the range of 250% or less, more preferably 230% or less.

The food packaging bag according to this embodiment is configured as described above. Next, a food packaging method using the food packaging bag according to this embodiment will be described. The outline is as described in the [Background Art] section.

First, as shown in FIG. 11(a), a bundle formed by bundling a plurality of food packaging bags according to the present embodiment is set in a packaging device (not shown) through pins P. As shown in FIG. Next, air of a predetermined pressure is blown into the bag body 10 from the opening 13 by a blower (not shown), or the opening 13 side of the front sheet 2 is sucked and lifted by a suction head (not shown). , opens the opening 13 . Then, the food F is inserted into the bag main body 10 in this state.

After the food F is accommodated in the bag body 10, the food packaging bag 1 is separated from the bundle as shown in FIG. When the food F is accommodated in the bag main body 10, the shape of the opening 13 becomes rectangular or substantially rectangular, and the portions of the front sheet 2 and the back sheet 3 straddling the side joints 12 are A pair of opposing triangular or substantially triangular side portions are formed, the middle portion of the front sheet 2 is a rectangular or substantially rectangular front portion, and the middle portion of the back sheet 3 is a rectangular or substantially rectangular rear portion. Become.

After the food F is accommodated in the bag main body 10, as shown in FIG. Fold the (sheet piece of the back portion) so as to cover the bottom surface of the food F, and then, as shown in FIG. It is folded so as to overlap the folded back sheet 3, and then, as shown in FIG. 3, and then the remaining sheet piece of the front sheet 2 (front sheet piece) is folded so as to overlap the previously folded left and right sheet pieces, resulting in a food packaging. The opening 13 of the bag 1 is closed.

However, first, the sheet piece on the front part is folded, then the sheet piece on the side part is folded, and finally the sheet piece on the back part is folded, or first one of the sheet pieces on the back part or the front part is folded, Next, the other sheet piece is folded and finally the side sheet piece is folded, or first the side sheet piece is folded, then one of the back or front sheet pieces is folded, and finally the sheet piece is folded. , the other sheet piece may be folded, and the order in which the four sheet pieces are folded is not particularly limited.

After the opening 13 is closed, a tape is applied to seal the opening 13 . Alternatively, the opening 13 may be sealed by affixing a label, or by heat-sealing or the like at predetermined portions where the film pieces are folded and overlapped. This completes the food package. The food package is then kept airtight by the top joint 11, the pair of side joints 12, 12, and the closed portion (bottom portion) of the sealed opening 13. As shown in FIG. As a result, outside air or the like does not enter inside, and the packaged food maintains the desired quality.

Next, features of the food packaging bag according to this embodiment will be described.

As explained in the [Problems to be Solved by the Invention] column, when inserting food into the food packaging bag 1, as shown in FIG. An upward force is applied to generate a tensile force T on the front sheet 2 and the back sheet 3 . However, in the food packaging bag according to the present embodiment, the shape of the notch 14 at the corner of the opening 13 is different from the first outline 14A, the second outline 14B and the third outline described above. It consists of three continuous outlines of 14C. As a result, as shown in FIG. 5A, the tensile force T acts mainly on the second contour line 14B and hardly acts on the end point 12a of the side joint portion 12. As shown in FIG. Therefore, according to the food packaging bag according to the present embodiment, it is possible to suitably prevent the side joint portion 12 from being split when the opening portion 13 is opened.

Here, as a result of intensive research, the applicant of the present application has found that the tangential line T1 of the first outline 14A at the end point 12a of the side joint portion 12 and the width direction (the direction perpendicular to the longitudinal direction) ) is 2 degrees (see FIG. 6(a)) or more, preferably 4 degrees (see FIG. 6(b)) or more, the above-mentioned split prevention effect is recognized. I'm pinpointing things.

In this embodiment, the side edges and side joints 12 of the bag body 10 are inclined at about 20 degrees with respect to the center line CL in the width direction of the food packaging bag 1. 14A is at an angle of (θ1+approximately 20 degrees) with respect to the normal to the side joint 12 .

On the other hand, if the crossing angle θ1 is large, the above-mentioned split prevention effect is exhibited, but if it is too large, the protrusion 15 (see FIG. 4(b)) becomes too sharp. Such protrusions 15 are likely to bend toward the inside of the bag body 10 when the tensile force T acts on the second outline 14B. Then, when the food is inserted, the bent convex portion 15 may be caught on the food and the opening shape may be deformed, resulting in poor insertion. In addition, there is a concern that the bent convex portion 15 may hit the inner surface of the sheet and damage the sheet. As a result of diligent research, the applicant of the present application has found that the intersection angle θ1 is 50 degrees or less (see (i) in the same figure), preferably 30 degrees or less (see (g) in the same figure), more preferably 25 degrees (see (g) in the same figure). It has been confirmed that such a problem does not occur if the angle is less than 20 degrees (see (e) in the figure) or less, more preferably 20 degrees (see (e) in the same figure).

However, even if the convex portion 15 has the crossing angle θ1 of 50 degrees or less, the tensile force T acting on the second outline 14B may cause the convex portion 15 to bend inward of the bag body 10 . Therefore, as described above, the maximum distance L1 from the normal line P1 of the side edge of the bag body 10 in contact with the second outline 14B to the first outline 14A is set so that the inward protrusion of the bag body 10 does not increase. (FIG. 4(b)) is 10 mm or less, more preferably 8 mm or less (the bending angle of the convex portion 15 with a large sharpness can be about 70 to 90 degrees, but the convex portion 15 that is not so In this case, the bending angle is not large due to its shape, so the amount of protrusion to the inside of the bag body 10 does not reach a size such as 10 mm or 8 mm.).

As described above, according to the food packaging bag of the present embodiment, the tensile force T generated in the opening 13 when opening the opening 13 or while the opening 13 is open is applied to the end point 12 a of the side joint 12 . Therefore, when the opening 13 is opened, the side joint 12 will not be torn, and the opening 13 will not catch food when it is inserted into the bag. Since there is no site, there is no possibility of poor insertion of food.

In addition, according to the food packaging bag according to the present embodiment, the width W2 of the opening edge 13A of the opening 13 formed by forming the notch 14 is 130% or more of the width W1 of the top joint 11. width. Since the width W1 of the top joint portion 11 is substantially equal to the width of the food F, as shown in FIG. , the sheet piece reliably covers the bottom surface of the food F, and the portion protruding from the bottom surface of the food F overlaps the inner surface of the unfolded sheet piece in a wide range. Therefore, the opening 13 is reliably closed, and it is possible to reliably prevent external air, foreign matter, etc. from entering the interior through the opening 13 .

Moreover, since the overlapping area of the sheet piece of the folded back sheet 3 and the unfolded sheet piece is large, for example, as shown in FIG. Joints along the edges (joints 18) of the points, and joints along the edges (joints 19) can be ensured. Thereby, the closing effect of the opening 13 can be further enhanced.

It should be noted that the food packaging bag according to the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in the above embodiment, the side edges of the bag body 10 and the side joints 12 were straight. However, the side edges of the bag body 10 and the side joints 12 may be curves that bulge outward or curves that are concave inward.

In the above-described embodiment, the first outline 14A of the notch 14 is a straight line, the second outline 14B is a curve, and the third outline 14C is a straight line. However, for example, the first to third outlines 14A to 14C may take various forms such as straight lines, curved lines, lines composed of straight lines (curves with discontinuous points), and lines in which straight lines and curved lines are appropriately combined. can be adopted.

Further, in the above-described embodiment, the notch portions 14 are formed at the left and right corner portions of the opening portion 13, respectively. However, if the tearing problem of the side joints 12 occurs only on one side of the left and right side joints 12 (e.g., rather than air blowing in from the center of the opening 13, either the left or the right) When the force to open the opening 13 is not equal to the left and right due to air blowing in from a slightly one-sided position, or when the suction point on the opening 13 side of the front sheet 2 is one of the left or right For example, as shown in FIG. 8(a), a notch 14 is formed only at one corner, or a normal notch 14 is formed at the other corner as shown in FIG. 8(b). ' or, as shown in FIG.

Also, in the above embodiments, the food was a sandwich. However, as long as it can be accommodated in the food packaging bag, the type of food is not limited to processed rice such as bread, cake, sponge cake, and rice ball.

REFERENCE SIGNS LIST 1 food packaging bag, 10 bag body, 11 top joint, 11a end point, 12 side joint, 12a end point (starting point of first outline), 12b intersection, 13 opening , 13A... opening edge, 14... notch, 14A... first profile line, 14a... end point of first profile line (starting point of second profile line), 14B... second profile line, 14b... second profile line 2 end point (starting point of third outline), 14C... third outline, 14c... end point of third outline, 15... convex portion, 17... header portion, 18, 19... joint portion , 2 front sheet, 20 trunk, 21 tip, 22 joint, 3 back sheet, 30 trunk, 31 tip, 32 cut line, 33 opening starting point, 4 inside Sheet 5 Unsealing guide means F food T tension T1, T2 tangential line H1 line θ1, θ2 intersection angle P1, P2 normal line L1 maximum distance W1, W2 width , CL...Center line

Claims (5)

A bag body in which a pair of sheets having a shape in which the other end side is wider than one end side is overlapped, and three sides are sealed by the top joint portion on one end side and the side joint portions on both side edges, and the other end side becomes an opening. In a food packaging bag comprising
The bag body has cutouts at the corners of the opening,
The notch is
A first contour line starting from an end point of the side joint formed by the notch, is inclined to approach one end of the bag body, and is the end point of the side joint a first outline having an intersection angle of 2 degrees or more and 25 degrees or less between a tangent line of the first outline and a line in the width direction of the bag body at the end point of the side joint;
a second outline starting from the end point of the first outline and recessed toward one end of the bag body, from a normal line of the side edge of the bag body in contact with the second outline a second contour line in which the maximum amount of protrusion of the protrusion protruding toward the other end of the bag body is 10 mm or less ;
A third outline having a starting point at an end point of the second outline and an end point at an intersection with the opening edge of the opening of the bag body, the third outline approaching the center line in the width direction of the bag body. and the distance from the end point of the third outline line to the center line is 150 % or more and 250% or less of the distance from the end point of the top joint to the center line A food packaging bag comprising The food packaging bag according to claim 1 , wherein the crossing angle is 2 degrees or more and 15 degrees or less . The maximum protrusion amount is 8 mm or less
The food packaging bag according to claim 1 or 2. The width of the side joint is 1 mm or less
The food packaging bag according to any one of claims 1 to 3. An extra sheet piece that protrudes from the bottom surface of the food when the food is contained in the bag body, and is one of the pair of sheets that is folded so as to cover the bottom surface of the food. Among the overlapping portions of the sheet pieces and the unfolded sheet pieces, portions near the left and right edges of the bottom surface of the food are joined.
The food packaging bag according to any one of claims 1 to 4.

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