JP7290595B2 - food packaging bag - Google Patents

Description

The present invention relates to food packaging bags.

There are foods such as sandwiches finished in a three-dimensional shape having a triangular (mainly right-angled triangular) or similar side shape and a predetermined thickness or width. Food packaging bags for packaging food are generally shown in FIGS. 16 and 17(a).

The food packaging bag 1' includes a bag body 10' and a header portion 15'. The bag body 10' is formed by superimposing a pair of sheets 2' and 3' having a shape wider at the other end side than at one end side. , 12' and the other end serves as an opening 13'. The header portion 15' is formed by joining the protruding pieces of the sheets 2' and 3' protruding from the top joint portion 11' to each other at appropriate points to be integrated.

On the second sheet 3' in the header portion 15', for example, an inverted U-shaped cut line 32' is formed, and an opening tab 33' having the cut line 32' as an outline is formed. be done. An unsealing strip 5' such as a cut tape is joined to the inner surface of the second sheet 3' from the tab 33' to the other end side of the second sheet 3'.

When eating the food packed in the food packaging bag 1', as shown in FIG. 17(b), the pick piece 33' is picked and pulled down. Then, the unsealing strip 5' is pulled to form a split opening in the second sheet 3', and the food can be taken out through this split opening.

However, the second sheet 3' and the unsealing strip 5' may not be sufficiently joined due to the influence of the accuracy of the manufacturing apparatus for the food packaging bag 1' (variation in joining conditions, etc.). In such a food packaging bag 1', when the tab 33' is pulled down at the time of opening, the tab 33' or the part of the second sheet 3' following the tab 33' is peeled off from the opening strip 5', Problems can arise that only the two sheets 3' are pulled and cannot be opened properly. This problem becomes more conspicuous as the bonding strength of the top bonding portion 11' increases. Therefore, in order to prevent the bonding strength of the top bonding portion 11' from becoming too strong, it has been conventionally practiced to apply a part coating agent to the bonding surface prior to bonding.

From the viewpoint of solving these problems, in the food packaging bag described in Patent Document 1, one end of the unsealing strip protrudes to the outer surface side of the header portion, and the one end is pinched to be unsealed. Since the unsealing strip is pulled directly to unseal, it can be unsealed appropriately and reliably. In this respect, the food packaging bag described in Patent Document 1 can be said to be superior to the conventional food packaging bag 1'.

Registered Utility Model No. 3072028

However, in the food packaging bag described in Patent Document 1, it is unclear what kind of processing is applied to the sheet so that one end of the strip for opening can protrude from the outer surface of the sheet. is. In addition, it is unclear how the food packaging bag described in Patent Document 1 protrudes one end of the unsealing strip from the outer surface of the sheet. For this reason, it is impossible to mass-produce food packaging bags that are consumed in large quantities.

Therefore, the present invention has been made in view of such circumstances, and includes an opening means that protrudes from one end of an opening strip and serves as an opening tab, and is excellent in mass productivity. The task is to provide a bag.

The food packaging bag according to the present invention is
A bag in which a pair of sheets having a shape in which the other end side is wider than one end side is overlapped, three sides are sealed by the top joint part on one end side and the side joint parts on both side edges, and the other end side is an opening. A food packaging bag comprising a main body and a header portion composed of projecting pieces of each sheet projecting from a top joint,
One of the sheets includes a free piece formed by forming a cut line in the header portion and opening when bent to form an opening. Equipped with a strip for opening over the other end side,
One end of the strip for opening is characterized in that it protrudes from the cut line to the outer surface side of one of the sheets and serves as a tab for opening.

In addition, another food packaging bag according to the present invention is
A bag in which a pair of sheets having a shape in which the other end side is wider than one end side is overlapped, three sides are sealed by the top joint part on one end side and the side joint parts on both side edges, and the other end side is an opening. A food packaging bag comprising a main body and a header portion composed of projecting pieces of each sheet projecting from a top joint,
One of the sheets has an opening in the header portion, and an unsealing strip on the inner surface of the one sheet extending from the opening to the other end of the sheet,
One end of the strip for opening protrudes from the opening toward the outer surface of one of the sheets to serve as a tab for opening.

In addition, the manufacturing method of the packaging sheet is
In a method for manufacturing a packaging sheet having an unsealing strip extending in a predetermined direction on one surface of the sheet,
forming score lines in the sheet and forming the score lines to form loose strips that open when bent to form openings;
An opening strip is arranged on one surface of the sheet so that a portion inside one end of the opening strip overlaps the free piece, and the opening is opened in a predetermined range from the free piece to the other end side of the opening strip. a step of joining the filaments to one surface of the sheet;
By applying an external force to the free piece, one end of the unsealing strip is moved to the other side of the sheet through the opening formed by the free piece, and protrudes from the cut line to the other side of the sheet. and a step.

In addition, the manufacturing method of the raw sheet for packaging is
In a method for manufacturing a raw sheet for packaging, the raw sheet is conveyed in the longitudinal direction, and strips for opening are attached to one surface of the raw sheet at predetermined intervals,
a step of forming cut lines in the original sheet by a cutting mechanism, and by forming the cut lines, forming free pieces that open when bent to form openings;
A conveying/joining mechanism located downstream of the cutting mechanism in the sheet conveying direction spreads the unsealing strip on one surface of the unsealing strip so that a portion inside one end of the unsealing strip overlaps the free piece. a step of arranging the opening strip and joining the opening strip to one surface of the raw sheet in a predetermined range from the free piece to the other end side of the opening strip;
An external force applying mechanism located downstream of the conveying/joining mechanism in the conveying direction of the original sheet applies an external force to the free piece, thereby forming an opening formed by the free piece at one end of the unsealing strip. a step of moving to the other surface side of the sheet material through the cut line and protruding from the cut line to the other surface side of the sheet material.

In addition, another packaging sheet manufacturing method includes:
In a method for manufacturing a packaging sheet having an unsealing strip extending in a predetermined direction on one surface of the sheet,
forming score lines in the sheet;
An opening strip is arranged on one surface of the sheet so that a portion inside one end of the opening strip overlaps the cut line, and a predetermined range from the cut line to the other end side of the opening strip is provided. , a step of joining the unsealing strip to one surface of the sheet;
By applying an external force toward the cut line, one end of the unsealing strip is moved to the other side of the sheet through the opening formed by the cut line, and moved from the cut line to the other side of the sheet. and projecting.

In addition, still another packaging sheet manufacturing method includes:
In a method for manufacturing a packaging sheet having an unsealing strip extending in a predetermined direction on one surface of the sheet,
forming an opening in the sheet;
An unsealing strip is arranged on one surface of the sheet so that a portion inside one end of the unsealing strip overlaps the opening, and a predetermined range from the opening to the other end of the unsealing strip is placed on the sheet. joining the strip to one surface of the sheet;
applying an external force toward the opening to move the one end of the unsealing strip to the other side of the sheet through the opening so as to protrude from the opening to the other side of the sheet.

As described above, according to the food packaging bag of the present invention, excellent mass productivity can be achieved with a simple configuration and a simple method.

FIG. 1 is an exploded perspective view of a food packaging bag according to one 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. FIG. 4(a) is a front view of a second sheet constituting the same food packaging bag. FIG.4(b) is an enlarged view of the opening starting point of FIG.4(a). FIG. 5(a) is a perspective view of a food package wrapped in the same food packaging bag as viewed from the rear side. FIG. 5(b) is a perspective view showing how the food package is opened. FIG. 6 is an explanatory diagram of the manufacturing process of the same food packaging bag, and is an explanatory diagram of the process of forming the cut lines in the second raw sheet material. FIG. 7 is an explanatory diagram of the manufacturing process of the same food packaging bag, and is an explanatory diagram of the process of arranging and joining the unsealing strips to the second raw sheet material. 8(a) and 8(b) are explanatory diagrams of the apparatus configuration for carrying out the process of FIG. FIG. 9 is an explanatory diagram of the manufacturing process of the food packaging bag, and is an explanatory diagram of the process of projecting one end of the unsealing strip from the cut line to the opposite side of the second raw sheet. . FIG. 10 is an explanatory diagram seen from the opposite side of FIG. FIGS. 11A to 11C are explanatory diagrams of the apparatus configuration for carrying out the process of FIG. FIGS. 12(a) to 12(c) are explanatory diagrams of another device configuration for carrying out the process of FIG. FIG. 13 is an explanatory diagram of the manufacturing process of the same food packaging bag, and is an explanatory diagram of each process from the first and second raw sheets to the final completion of the food packaging bag. FIGS. 14A to 14D are enlarged views of essential parts of food packaging bags according to different embodiments. 15(a) to (d) are enlarged views of essential parts of food packaging bags according to still other embodiments. FIG. 16 is a rear view of a conventional food packaging bag. FIG. 17(a) is a perspective view of a food package wrapped in the same food packaging bag as viewed from the rear side. FIG. 17(b) is a perspective view showing how the food package is opened.

A food packaging bag used for sandwich packaging will be described below as an embodiment of the food packaging bag according to the present invention with reference to FIGS. 1 to 13. FIG.

As shown in FIGS. 1 to 3, the food packaging bag 1 according to this embodiment includes a bag body 10 and a header portion 15. As shown in FIGS. The bag body 10 is formed by stacking a pair of sheets (a first sheet 2 and a second sheet 3) having a shape in which the other end side is wider than the one end side. Three sides are sealed by the side joints 12, 12, and the other end serves as an opening 13. As shown in FIG. The header portion 15 is formed by joining the protruding pieces of the sheets 2 and 3 protruding from the top joint portion 11 to each other at appropriate locations and integrating them. The first sheet is also called a front sheet, and the second sheet is also called a back sheet.

The first sheet 2 is made of a heat-sealable plastic sheet such as polyethylene or polypropylene. The first sheet 2 includes a body portion 20 and a tip portion 21 (the projecting piece described above). The trunk portion 20 has a shape that gradually widens from one end side to the other end side. The tip portion 21 has a narrow shape extending from one end of the trunk portion 20 .

The second sheet 3 is also made of a heat-sealable plastic sheet such as polyethylene or polypropylene. The second sheet 3 includes a body portion 30 and a tip portion 31 (the projecting piece described above). The trunk portion 30 has a shape that gradually widens from one end side to the other end side. The tip portion 31 has a narrow shape extending from one end of the trunk portion 30 .

In this embodiment, the trunk portions 20 and 30 are trapezoidal, and the tip portions 21 and 31 are rectangular. For this reason, one end of the body portions 20 and 30 (and the other end of the leading end portions 21 and 31 corresponding thereto) is directed from one end side to the other end side of the sheets 2 and 3 (hereinafter referred to as "longitudinal direction"). In other words, one end of each of the trunks 20 and 30 is a straight line parallel to the direction perpendicular to the longitudinal direction (hereinafter referred to as the “width direction”). , 30 are linearly inclined with respect to the longitudinal direction, and both side edges of the distal end portions 21, 31 are linearly parallel to the longitudinal direction. The other end side is cut off by the notch portion 14. As a result, the other end sides of the body portions 20 and 30 are narrowed by the notch portion 14. As shown in FIG.

The top joint 11 is formed by heat sealing the first and second sheets 2,3 along one edge of the body 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 . In this embodiment, the top joint portion 11 is a belt-shaped seal formed by welding using a heat seal bar and having a predetermined width in the longitudinal direction. The side joints 12 are line seals formed by fusing. Specifically, the top joint 11 has a width of several millimeters or more. The width of the side joint 12 is 1 mm or less.

The interior of the bag body 10 configured in this manner serves as a food storage section. An inner sheet 4 is attached to the inner surface of the first sheet 2 in the bag body 10 . The inner sheet 4 is joined, for example, at two points at the other end by point seals (joints 22), and one end is a free end. As a result, even if the food moves within the container, the inner sheet 4 adheres to the surface of the food and follows the movement. Therefore, the first sheet 2 is not soiled and its appearance is not spoiled.

As also shown in FIG. 4 , a cut line 32 is formed in the second sheet 3 in the header portion 15 . A loose piece 33 is formed in the second sheet 3 in the header portion 15 by forming the cut line 32 . The cut line 32 is shaped such that the end points 32 a , 32 a approach the top joint 11 . The free piece 33 has a cut line 32 as an outline, a fixed end between both end points 32a, 32a, a free end at one end, and is bent at the fixed end to open to form an opening. In this embodiment, the cut line 32 is formed in an inverted U shape. As a result, the loose piece 33 has one end edge 33a along the width direction and a pair of left and right side edges 33b, 33b along the longitudinal direction, and serves as an upward tongue piece.

An unsealing strip 5 is provided on the inner surface of the second sheet 3 from the loose piece 33 to the other end side of the second sheet 3 . The strip 5 for opening is provided, for example, along the longitudinal direction at the central portion in the width direction of the second sheet 3 . The strip 5 for opening is joined to the inner surface of the second sheet 3 by heat sealing, adhesion, or the like (joint portion 34). As an example, the strip 5 for opening is attached to the inner surface of the second sheet 3 by thermal adhesion or self-adhesion after applying a coating agent to the inner surface (the surface facing the second sheet 3). . The strip 5 for opening is, for example, cut tape or thread. In this embodiment, the unsealing strip 5 is a strip-shaped cut tape with a width of 5 mm or more, or 10 mm or more. The cut tape is obtained by thinly cutting a thermally adhesive plastic sheet such as biaxially oriented polyester or polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), or biaxially oriented polypropylene (OPP).

One end portion 5 a of the opening strip 5 is not joined to the second sheet 3 . One end 5a of the strip 5 for opening protrudes from the cut line 32 to the outer surface side of the second sheet 3 and serves as a tab for opening. As a result, when one end portion 5a of the opening strip 5 is grasped and pulled down, the opening strip 5 is pulled, and the second sheet 3 is cut at a predetermined width with the loose piece 33 as the opening starting point, thereby cutting the second sheet 3 into the second sheet. A split open portion is formed in the sheet 3 of 2. If the protruding amount of the one end portion 5a of the unsealing strip 5 is short, it will be difficult to pick it up. On the other hand, if it is long, it may be easily broken, and there is a concern that the transportability of the manufacturing apparatus may be hindered. Therefore, the protrusion amount of the one end portion 5a of the unsealing strip 5 is set to be 5 mm or more, 10 mm or more, or 15 mm or more, and 25 mm or less, or 20 mm or less.

As shown in FIG. 4(b), the opening strip 5 is also joined to the loose piece 33 and integrated with the loose piece 33. As shown in FIG. However, the unsealing strip 5 is not joined up to one end edge 33a of the loose piece 33. As shown in FIG. Therefore, between one edge 34a of the joint 34 and one edge 33a of the loose piece 33, a non-joint part having a width G1 is interposed. If the non-joint portion is not provided or the width G1 is small, there is a concern that joining may be performed beyond the cut line 32 due to the influence of the accuracy of the manufacturing device for the food packaging bag 1 (meandering of the original sheet, etc.). There is In this case, the one end portion 5a of the unsealing strip 5 is locked, and the one end portion 5a cannot be protruded from the cut line 32 to the outer surface side of the second sheet 3. As shown in FIG. Conversely, if the width G1 is large, it becomes possible to pinch the loose piece 33, and there is a concern that an erroneous opening operation may be performed by pinching this to open. In this case, of course, the unsealing strip 5 is not used and only the second sheet 3 is pulled, making it impossible to unseal properly. For this reason, the width G1 of the non-bonded portion is set to be 1 mm or more, or 1.5 mm or more, and 5 mm or less, or 3 mm or less, or 2 mm or less, as a deviation width for manufacturing errors. .

The width of the strip 5 for opening is smaller than the width of the fixed end of the free piece 33 (that is, the distance between the end points 32a, 32a of the cut line 32). Therefore, between each side edge 5b of the unsealing strip 5 and each side edge 33b of the free piece 33 or each end point 32a of the cut line 32, a gap of width G2 is interposed. If the gap is not provided or the width G2 is small, the one end 5a of the opening strip 5 is caught in the cut line 32, and the one end 5a protrudes from the cut line 32 to the outer surface side of the second sheet 3. I am worried that I will not be able to In addition, due to the influence of the accuracy of the manufacturing apparatus for the food packaging bag 1 (such as misalignment of the sticking position), the unsealing strip 5 may be caught on the cut line 32 and wrinkled, resulting in a defective product. For this reason, the width G2 of the gap is set to be 1 mm or more, or 1.5 mm or more as a deviation width for manufacturing errors.

When packaging the food, after opening the opening 13 and inserting the food into the bag body 10, the excess sheet piece in the opening 13 (the sheet piece protruding from the bottom of the food) is appropriately folded to close the opening 13. , a label or tape is applied and the opening 13 is sealed. As a result, the food package shown in FIG. 5(a) is completed. In this food package, one end 5a of the opening strip 5 has a free piece 33 as a fixed end and one end as a free end. protrude. On the other hand, other portions of the opening strip 5 are along the inner surface of the second sheet 3 from the loose piece 33 .

Then, when eating the food, as shown in FIG. 5(b), one end 5a of the protruding opening strip 5 is grasped and pulled down. Then, the unsealing strip 5 is pulled to form a split opening in the second sheet 3, and the food can be taken out through this split opening. In the food package, the one end portion 5a of the opening strip 5 is slightly separated from the outer surface of the header portion 15 so that it can be easily picked up. Alternatively, by warping the header portion 15, the one end portion 5a of the unsealing strip 5 is sufficiently separated from the header portion 15, making it easier to pick up. Therefore, the unsealing operation can be performed smoothly.

The food packaging bag according to this embodiment is configured as described above. Next, a method for manufacturing the food packaging bag according to this embodiment will be described.

The manufacturing process can be broadly divided as shown in FIGS. 6 to 12. As shown in FIGS. 6 to 12, one end portion 5a of the unsealing strip 5 protrudes from the outer surface of the second sheet 3 to provide an unsealing means serving as an unsealing tab. A step of manufacturing a second raw sheet 3X and, as shown in FIG. 13, a step of manufacturing the food packaging bag 1 from the first raw sheet 2X and the second raw sheet 3X.

This type of food packaging bag 1 having a trapezoidal shape is manufactured so as to be laterally opposite to the conveying direction of the raw sheets 2X and 3X because of its shape. That is, the food packaging bag 1 in which the opening 13 is formed on one side in the width direction intersecting the conveying direction of the raw sheets 2X and 3X and the header portion 15 is formed on the other side in the width direction; The food packaging bags 1 in which the opening 13 is formed on the other side in the direction and the header portion 15 is formed on the one side in the width direction are alternately manufactured. Therefore, in the following description and drawings, the former structure of the food packaging bag 1 is denoted by the word "one" for the sake of convenience, and the reference numeral is followed by "A". The structure related to the food packaging bag 1 is given the word "other" and the reference numeral followed by "B".

The step of manufacturing the second material sheet 3X is an embodiment of the method for manufacturing a packaging sheet and the method for manufacturing a material packaging sheet according to the present invention. This step includes i) a step of forming cut lines 32 in the second raw sheet 3X as shown in FIG. 6, more specifically, forming the cut lines 32 in the second raw sheet 3X. ii) as shown in FIGS. 7 and 8, a strip for opening is formed on the inner surface of the second raw sheet 3X as shown in FIG. 7 and FIG. The opening strip 5 is arranged so that the inner portion of the one end 5a of the opening strip 5 overlaps the free piece 33, and the opening strip 5 is placed within a predetermined range from the free strip 33 to the other end of the opening strip 5. A step of joining the body 5 to the inner surface of the second raw sheet 3X (second step), iii) As shown in FIGS. 9 to 12, by applying an external force toward the free piece 33, By applying an external force to the portion of the strip 5 for opening in the loose piece 33, one end portion 5a of the strip 5 for opening is pushed through the opening formed by the strip 33 to the opposite side of the second sheet material 3X. A step (third step) of moving to the surface (outer surface) side and protruding from the cut line 32 to the opposite surface side of the second sheet material 3X.

In the first step, the second raw sheet 3X is intermittently conveyed. A cutting mechanism (not shown) for one cutting line 32A and a cutting mechanism (not shown) for the other cutting line 32B, which are arranged on the conveying path, are arranged in the second As shown in FIG. 6, one cut line 32A and the other cut line 32B are formed by operating in synchronization with the intermittent conveyance of the original sheet 3X.

The cutting mechanism includes, for example, a receiving roller and a tool. This cutting mechanism reciprocates the tool to the receiving roller and causes the notch blade provided on the surface of the tool to come into contact with the receiving roller, thereby forming a cut line 32 in the second sheet material 3X. However, the cutting mechanism is not limited to such a configuration. The cutting mechanism may have other configurations as long as it can form the cutting lines 32 in the second sheet material 3X.

In the second step, the second original sheet 3X is intermittently conveyed. 7 and 8, cutting/conveying/joining mechanisms 100 and 101 for one unsealing strip 5A and cutting for the other unsealing strip 5B are arranged on the transport path. The conveying/joining mechanisms 100 and 101 operate in synchronism with the intermittent conveyance of the second original sheet 3X, so that one unsealing strip 5A and the other unsealing strip 5B are unsealed. It is separated from the original sheet 5X of the strip, conveyed, placed on the inner surface of the second original sheet 3X, and joined (joined portions 34A, 34B).

The cutting mechanism 100 includes, for example, a pair of cutting blades. The cutting mechanism 100 cuts the unsealing strip 5X unwound from the roll along the conveying direction of the sheets 2X and 3X to a predetermined width to form the unsealing strip 5. As shown in FIG. However, the cutting mechanism is not limited to such a configuration. The cutting mechanism may be a mechanism having another configuration as long as it can form the opening strip 5 with a predetermined width.

The conveying/bonding mechanism 101 includes, for example, a holding bar 102 and a bonding bar 103 . The holding bar 102 holds the opening strip 5 by sucking it along the longitudinal direction, and conveys the opening strip 5 from the cutting position to the placement position on the second sheet material 3X. . The joining bar 103 is arranged on the side opposite to the second raw sheet 3X at the position where the unsealing strip 5 is arranged on the second raw sheet 3X. The joining bar 103 is, for example, a heat seal bar. The conveying/joining mechanism 101 holds the unsealing strip 5 formed by cutting with a holding bar 102, conveys it by moving the holding bar 102 (elevating and lowering in the example of FIG. 8), and transfers the second sheet material. After that, the holding bar 102 and the joining bar 103 sandwich the second sheet material 3X and the unsealing strip 5 arranged on the inner surface, and heat seal the joining portion. 34 is formed.

Here, the joining bar 103 is shorter than the holding bar 102 at one end. Therefore, the portion of the unsealing strip 5 that is held by the holding bar 102 but not sandwiched between the joining bar 103 is not joined to the second raw sheet 3X, and the one end 5a and the one end 5a becomes a non-junction adjacent to

However, the conveying/joining mechanism is not limited to these configurations. The conveying/joining mechanism is capable of joining the unsealing strip 5 to the inner surface of the second original sheet 3X while leaving the one end 5a and the unjoined portion. As long as the unsealing strip 5 can be joined to the inner surface of the second sheet material 3X within a predetermined range on the other end side of the body 5, the mechanism may have another configuration.

In the third step, the second original sheet 3X is intermittently conveyed. 9 to 12, external force applying mechanisms 104 and 105 for one opening strip 5A and external force applying mechanism 104 for the other opening strip 5B are arranged on the conveying path. , 105 operate in synchronism with the intermittent conveyance of the second original sheet 3X, so that the one end 5a of the unsealing strip 5A and the one end 5a of the other unsealing strip 5B are separated. , is extruded to the opposite surface side of the second raw sheet 3X.

The external force application mechanism includes an air nozzle 104 (FIG. 11) as an example. This external force applying mechanism bends the loose piece 33 to form an opening by blowing air toward the loose piece 33 and the portion of the strip 5 for opening in the loose piece 33, and the strip for opening is opened through this opening. 5 is moved to the opposite side of the second sheet material 3X. Alternatively, the external force application mechanism includes, for example, a rod 105 (FIG. 12) that moves up and down. This external force application mechanism applies the tip of the rod 105 to the free piece 33 and the portion of the opening strip 5 in the free piece 33, and further pushes the rod 105 to bend the free piece 33 to form an opening. , one end portion 5a of the unsealing strip 5 is moved to the opposite surface side of the second sheet material 3X.

However, the external force application mechanism is not limited to these configurations. The external force applying mechanism may be a mechanism having another configuration as long as it can move the one end portion 5a of the strip 5 for opening to the opposite surface side of the second raw sheet 3X. For example, a suction mechanism or a suction mechanism is arranged on the opposite surface side of the second raw sheet 3X to suck or suck the loose piece 33 from the opposite surface side, and the one end 5a of the unsealing strip 5 is moved to the second You may make it move to the opposite surface side of the sheet raw fabric 3X.

The second raw sheet 3X is manufactured as described above. Then, the second sheet material 3X is once wound into a roll and then set in a bag making apparatus. Alternatively, the second raw sheet material 3X is manufactured by the bag making apparatus, is continuously conveyed, and then the food packaging bag 1 is produced from the first raw sheet material 2X and the second raw sheet material 3X. Move to the manufacturing process.

The process of manufacturing the food packaging bag 1 is as described, for example, in Japanese Unexamined Patent Application Publication No. 2005-219319, and is a conventionally used method. For this reason, much will not be described here. In this step, as shown in FIG. 13, the first sheet material 2X and the second sheet material 3X are overlapped so that the inner surfaces thereof face each other, and while intermittently conveying in this state, iv) the top portion v) separating the food packaging bags 1 individually while forming the side joints 12; and vi) forming the cutouts 14. Through these steps, the food packaging bag 1 is completed. Although not shown, the step of joining the inner sheet 4 to the inner surface of the first sheet 2X is performed before the first sheet 2X and the second sheet 3X are overlapped.

Thus, according to the present embodiment, the second raw sheet 3X is provided with opening means in which one end portion 5a of the unsealing strip 5 protrudes to the outer surface side of the second sheet 3 and serves as an unsealing tab. According to the manufacturing method, excellent mass productivity can be achieved with a simple configuration and a simple method.

Also, the direction in which the one end portion 5a of the opening strip 5 extends coincides with the direction in which the loose piece 33 extends (both are upwardly convex). Therefore, the one end portion 5a of the unsealing strip 5 can be reliably moved to the opposite side of the second sheet material 3X with a small force.

In addition, this invention is not limited to the said embodiment. Various modifications can be made to the present invention without departing from the gist of the present invention.

The shape and structure of the cut lines and loose pieces are not limited to those of the above embodiments. For example, the shape and configuration of the score lines and loose pieces may be as shown in FIGS. 14 and 15. FIG.

FIG. 14(a) shows that one end portion 5a of the opening strip 5 is provided with a display portion 50 that can be identified from the surrounding area. Normally, the opening strip 5 is transparent. For this reason, if the one end 5a is left as it is, it will be inconspicuous. Depending on the product purchaser, it may be difficult to recognize that it is a tab for opening the package. Therefore, by printing the display portion 50 on one end portion 5a of the opening strip 5, any product purchaser can easily recognize that it is an opening tab.

As the display part, in addition to the display part 50 consisting of information indicating that it is a tab for opening, or in place of the display part 50, a simple color that can be distinguished from the surrounding area, as shown in FIG. The display portion 51 may be a pattern or the like.

FIG. 14(c) shows a π-shaped cut line 32, that is, a line (horizontal line) 32b along the width direction that intersects the longitudinal direction, and a longitudinal A cut line 32 is formed by left and right lines (vertical lines) 32c, 32c extending along the direction. According to this configuration, after the unsealing strip 5 is unsealed in the vertical direction (longitudinal direction) by holding one end portion 5a of the unsealing strip 5, cut lines 32d, 32d directed outward in the width direction are formed in the header portion 15. be. Therefore, the remaining second sheet 3 after unsealing can be opened to the left and right to enlarge the divided open portion, and the food can be easily taken out.

FIG. 14(d) shows an X-shaped cut line 32 formed by crossing two oblique cut lines 32e, 32e. Even with such a configuration, the cut lines 32f, 32f directed outward in the width direction are formed in the header portion 15 after the package is unsealed. Therefore, the remaining second sheet 3 after unsealing can be opened to the left and right to be wide open.

15A shows an H-shaped cut line 32, that is, a line (horizontal line) 32g along the width direction intersecting the longitudinal direction, and along both longitudinal directions from both end points of the line 32g. A cut line 32 is formed by extending left and right lines (vertical lines) 32h, 32h. According to such a configuration, in addition to the upward loose piece 33 , the downward loose piece 35 can also be formed so as to face the loose piece 33 .

FIG. 15(b) shows a downward cut line 32, that is, a cut line 32 in which the direction in which the one end portion 5a of the opening strip 5 extends is opposite to the direction in which the loose piece 35 extends. is formed.

The cut line may be a straight line or a slightly curved line such as a line (horizontal line) along the width direction that intersects the longitudinal direction, or a line that is inclined with respect to the width direction.

In addition, as a structure for making it possible to move the one end portion 5a of the unsealing strip 5 to the opposite side of the second sheet 3, instead of the combination of the cut line 32 and the loose piece 33, It may also be an aperture 36, as shown in c). Even at the opening 36, the device and method for moving the one end 5a of the opening strip 5 to the opposite side of the second sheet 3 are basically the same as those described above.

Moreover, as shown in FIG. 15(d), the joining portion 34 between the second sheet 3 and the unsealing strip 5 may be formed so that their centers are aligned. Also, the joint portion may be formed in the entire width direction of the opening strip 5 . Also, the joints may be formed only at both side edges of the unsealing strip 5 in the width direction. Further, it is not essential that the joining portion is formed to reach the other end of the unsealing strip 5 . In short, it is sufficient as long as the strip 5 for opening is not peeled off from the second sheet 3 .

Also, the joints are not limited to those formed continuously along the longitudinal direction. For example, the joint may consist of a point seal applied at any suitable location, including at the loose piece 33 .

Also, the cut line is not limited to a full cut line. The cut line may be broken when an external force is applied by the external force applying mechanism. For example, the cut line may be a half cut line (half cut) or a perforation.

Moreover, the strip for opening is not limited to what consists of one member. For example, the strip for opening may be formed by integrally joining a body portion and one end portion, which are separate bodies.

Also, the opening means may be provided on the first sheet 2 instead of the second sheet 3 .

In addition, shapes, parts or states such as “trapezoidal”, “rectangular”, “rectangular”, “straight line”, “center”, “end”, “side”, “match”, “parallel” In the present invention, the term used includes not only the term itself, but also the concept of "substantially" meaning that it is close to or similar to it.

Food to be packaged is not limited to sandwiches. The food may be in any form as long as it can be accommodated in the food packaging bag. For example, the food may be bread, cake, processed rice food such as rice balls, and the like. Thus, the type of food is not limited.

Moreover, the manufacturing method of the packaging sheet and the manufacturing method of the raw packaging sheet are not limited to the above-described embodiments.

In the above-described embodiment, prior to the step of projecting the one end portion 5a of the strip 5 for opening from the cut line 32 or the opening 36 to the other side of the sheet (original fabric) (protruding step), the strip for opening 5 is extended. A step (bonding step) of bonding to one surface of the sheet (original fabric) is performed. However, the joining step may be performed after the protruding step. In this case, prior to the projecting step, the unsealing strips arranged on one surface of the sheet (original fabric) are placed on one surface of the sheet (original fabric) so that the strips for opening are not misaligned with respect to the sheet in the projecting step. It is preferable to perform a step of temporarily fixing to the (temporary fixing step). The temporary fixing step is performed by, for example, an adhesive, an adhesive, sandwiching, pressurization, pressure bonding, weak bonding (weak heat sealing), or the like.

The packaging sheet is not limited to those used for a particular form of packaging. There are various types of packaging sheets, such as the outer sheet of food packaging materials that separate rice balls and seaweed sheets, pillow packaging sheets, and sheets used for general bags such as flat bags and gusset bags. All items used for packaging are covered.

Moreover, the packaging object is not limited to foods. The object to be packaged may be an object to be packaged other than food.

Moreover, the packaging sheet is not limited to a continuous elongated shape. For example, the packaging sheet may be in the form of a single sheet.

Also, the packaging sheet is not limited to a single plastic sheet. For example, the packaging sheet may be a sheet made of other materials such as paper or a paper-based sheet. In addition, the packaging sheet is, for example, a single sheet formed by joining two sheets at their ends, or a sheet formed by joining three sheets sequentially at their ends. As in the above, a single sheet may be formed using a plurality of sheets. Moreover, in this case, the material of each sheet may be different. For example, some sheets may be paper or paper-based sheets rather than plastic sheets.

1, 1A, 1B... food packaging bag, 10... bag body, 11, 11A, 11B... top joint, 12, 12A, 12B... side joint, 13... opening, 14, 14A... notch, 15 ... Header part 2 ... First sheet (front sheet) 2X ... First sheet material 20 ... Body part 21 ... Tip part 22 ... Joining part 3 ... Second sheet (back sheet) 3X... Second sheet raw fabric 30... Body part 31... Tip part 32, 32A, 32B... Cutting line 32a... End point 32b to 32h... Cutting line 33, 33A, 33B... Free piece, 33a...one end edge 33b...side edge 34, 34A, 34B...joint part 34a...one end edge 35...free piece 36...opening 4...inner sheet 5,5A, 5B...unsealing strip, 5X Raw sheet of unsealing strip 5a One end (pick piece) 5b Side edge 50 Display unit 51 Display unit 100 Cutting mechanism 101 Conveying/joining mechanism 102 Holding bar , 103... Joining bar, 104... Air nozzle (external force applying mechanism), 105... Rod (external force applying mechanism), L1... Width direction center line of unsealing strip 5 and free piece 33, L2... Width direction of joint portion 34 G1 . . . Interval between one end edge 34a of joint portion 34 and one end edge 33a of free piece 33 (width of non-joint portion); G2 . 32a (width of the gap), S1...the amount of deviation between the center line L1 and the center line L2

Claims (8)

A bag in which a pair of sheets having a shape in which the other end side is wider than one end side is overlapped, three sides are sealed by the top joint part on one end side and the side joint parts on both side edges, and the other end side is an opening. A food packaging bag comprising a main body and a header portion composed of projecting pieces of each sheet projecting from a top joint,
One of the sheets includes a free piece formed by forming a cut line in the header portion and opening when bent to form an opening. Equipped with a strip for opening over the other end side,
A packaging bag for food, wherein one end of the strip for opening protrudes from the cut line toward the outer surface of one of the sheets to serve as a grip for opening. the score line has a shape with both end points approaching the apex joint;
2. The food packaging bag according to claim 1, wherein the free piece has a fixed end between both end points of the cut line and a free end at one end away from the top joint. The opening strip is joined to the inner surface of one of the sheets in a predetermined range from the free piece to the other end side of the opening strip,
3. The food packaging bag according to claim 1, wherein a non-bonded portion having a predetermined width is interposed between one edge of the bonded portion and the cut line. The width of the strip for opening is smaller than the interval between the end points of the cut line,
The food packaging bag according to any one of claims 1 to 3, wherein a gap of a predetermined width is interposed between each side edge of the opening strip and each end point of the cut line. . A bag in which a pair of sheets having a shape in which the other end side is wider than one end side is overlapped, three sides are sealed by the top joint part on one end side and the side joint parts on both side edges, and the other end side is an opening. A food packaging bag comprising a main body and a header portion composed of projecting pieces of each sheet projecting from a top joint,
One of the sheets has an opening in the header portion, and an unsealing strip on the inner surface of the one sheet extending from the opening to the other end of the sheet,
A packaging bag for food, wherein one end of the strip for opening protrudes from the opening to the outer surface side of one of the sheets to serve as a tab for opening. 6. The food packaging bag according to any one of claims 1 to 5 , wherein one end of the unsealing strip is provided with a display part that can be identified from a peripheral area of the one end. Each sheet of the pair of sheets is formed by joining a plurality of sheets end-to-end to form a single sheet.
The food packaging bag according to any one of claims 1 to 6. Some of the sheets are paper sheets and the other sheets are plastic sheets.
The food packaging bag according to claim 7.

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