Packaging bag for sandwich

Abstract

To provide a packaging bag for sandwich, which allows the packaging bag for wrapping a triangular sandwich to be widely opened.SOLUTION: A packaging bag for sandwich has a bag body obtained by overlaying a pair of plastic film sheets on each other, and sealing three sides in a state where a predetermined range of the tip of each sheet above a top sealing portion 2 is left as a tab 4. An unsealing guideline composed of a notch and a perforated line consisting of right and left sides 8 and 8, which starts from the vicinity of the top sealing portion 2 of the bag body configuration region of one sheet and is suspended from an upper side 7 and the right and left of the upper side on the region continuing to the rear side of the sheet, is disposed. A cover tape 6 covering the unsealing guideline is partially weakly heat-sealed at the surface of the one sheet, and the weakly heat-sealed place is made into a linear place S1 which is located on the unsealing guide line and is thicker than the unsealing guide line in width, and a linear place which starts from the upper side of the unsealing guide line and is located between the right and left sides.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sandwich packaging bag for containing a triangular sandwich. [Background technology]

[0002] 2. Description of the Related Art A sandwich packaging bag is known in which a pair of plastic film sheets are overlapped to form a bag body that is sealed on three sides, and a sandwich is inserted into the bag body for packaging.

[0003] A widely used packaging bag assuming a triangular sandwich is constructed by overlapping a pair of plastic film sheets whose both sides narrow toward the tip, sealing the three sides with an adhesive such as heat sealing, and expanding the bag three-dimensionally. In this case, the sealed portions constituting the bag are provided in a state in which a predetermined range at the tip of the sheet is left as a tab and the rear end is left as an opening, specifically, a top sealed portion where the sheets are bonded together along a line crossing both sides, and a side sealed portion where both sides of the sheets behind the top sealed portion are bonded together.

[0004] After the sandwich is placed inside this packaging bag, the excess portion of the bag that runs from the rear end of the food to the opening at the rear end of the bag is folded and sealed with adhesive tape or the like, and the sandwich is then distributed as a packaged sandwich. Therefore, consumers who purchase this sandwich must remove the packaging to take out the food contained therein, but because opening the sealed portion at the rear end of the food is troublesome, they tear and destroy the bag itself to take out the food. However, because it is difficult to tear the bag as it is without any clues, many easy-to-open means have been proposed in the past.

[0005] A well-known representative example of the easy-opening means is a sandwich packaging bag in which a bag is sealed on three sides with a top sealing section formed by overlapping a pair of plastic film sheets and bonding the sheets together along a line crossing both sides while leaving a predetermined range at the tip of each sheet as a tab, and side sealing sections formed by bonding both sides of the sheets rearward of the top sealing section, in which an easy-opening means for tearing the bag, such as a pair of notches or a tongue cut into a peninsula shape, is provided in the tab portion of one of the sheets, and a cut tape, one end of which extends beyond the top sealing section to reach the easy-opening means, is bonded to the back surface of the sheets (Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication 2020-200069 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0007] In the above-mentioned conventional technology, the easy-to-open means, such as a knob provided on the tab portion, is grasped with the fingertips together with the cutting tape and pulled up, whereby the sheet is cut in a direction defined by the cutting tape, i.e., along the entire length of the slope of the bag body, and the sandwich is exposed through a window created by the cutting.

[0008] In this case, the packaging bag has not yet been completely opened, and in order to remove the food contained therein, it is necessary to pinch both ends of the cut portion with the fingers and pull them in opposite directions to completely open the bag. For this reason, it is desirable for the window created by the cut portion to be as large as possible, which requires an easy-to-open means such as a tab and a wide cutting tape.

[0009] When opening a bag using conventional cutting tape, the cutting tape is placed on the inside of the bag. Therefore, if the width of the cutting tape is made wider, the orientation of the outer film can cause it to slip out of the guide of the cutting tape, causing the film to tear in an unexpected direction, resulting in the bag breaking.

[0010] Furthermore, when attaching the thermal seal that serves as the product label, problems arose such that the cutting tape would break or be too hard to tear. [Means for solving the problem]

[0011] The present invention has been made with the objective of providing a sandwich packaging bag which solves the above problems.

[0012] That is, the present invention provides a sandwich packaging bag in which a bag is sealed on three sides by overlapping a pair of plastic film sheets, bonding the sheets together by heat sealing along a line that crosses both sides while leaving a predetermined range at the tip of each sheet as a tab to form a top sealed portion, and bonding both sides of the sheets rearward of the top sealed portion to form a side sealed portion, one of the sheets being provided with easy-opening means for tearing the bag, and the bag is expanded into a plate-like three-dimensional shape that follows the outline of the sandwich by inserting a sandwich through an opening at the rear end of the bag, An opening guide line is provided in a region starting from the vicinity of the top sealing portion of the bag-forming region of one of the sheets and continuing to the rear of the sheet, the opening guide line being made up of a cut and a perforation line formed by a top edge and left and right edges extending downward from the left and right sides of the top edge; A plastic film cover tape covering the tear guide line and having a tip that reaches the tab is partially weakly heat sealed to the surface of one of the sheets, The weak heat seal portion is characterized in that it is a line-shaped portion that is located on the opening guide line and is wider than the opening guide line, and a line-shaped portion that starts from the upper side of the opening guide line and is located between the left and right sides.

[0013] The invention described in claim 2 is characterized in that, in the sandwich packaging bag, the upper side of the opening guide line has a mountain shape whose left and right lower ends are continuous with the left and right sides.

[0014] The invention described in claim 3 is characterized in that, in the sandwich packaging bag, the upper side of the opening guide line is a straight line whose both ends continue to the left and right sides.

[0015] The invention described in claim 4 is characterized in that, in the sandwich packaging bag, the upper side of the opening guide line is a notch, and the left and right sides are perforated lines. Effect of the Invention

[0016] In the sandwich packaging bag of the present invention, when opening the bag, the non-heat sealed portion at the upper end of the cover tape is picked up and pulled up, and one of the sheets is pulled up by the cover tape since a portion of the sheet is heat sealed to the cover tape.

[0017] In the above case, since the heat-sealed portion is located on the tear guide line and has a line shape that is wider than the tear guide line, one of the sheets near the tear guide line is pulled up.

[0018] On the other hand, since there is a linear heat seal portion between the left and right sides starting from the top edge of the tear guide line, one sheet is also pulled up at this portion. In such a case, a force is applied to one sheet near the tear guide line, which tends to pull it up from the outside of the area surrounded by the tear guide line to the inside. As a result, the area surrounded by the tear guide line is broken at the tear guide line and pulled up together with the cover tape, while the heat seal on the outside of the area surrounded by the tear guide line is weak, so the cover tape is peeled off and does not interfere with the above action.

[0019] As a result of the above-mentioned action, the sandwich packaging bag of the present invention can provide a wide opening without the film tearing in an unexpected direction and the bag breaking, making it easy to remove the product from the sandwich bag.

[0020] Furthermore, in the present invention, the heat-sealed area is linear and wider than the tear guide line, so that it straddles and covers the tear guide line, preventing moisture or sauce from the sandwich from seeping out through the tear guide line. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a front view of the sandwich packaging bag of the present invention. [Diagram 2] FIG. [Diagram 3] Same as above, perspective view [Figure 4] The same as above, perspective view of the product being opened [Diagram 5] FIG. 2 is a front view of a different embodiment of the sandwich packaging bag of the present invention. BEST MODE FOR CARRYING OUT THEINVENTION

[0022] A specific embodiment of the present invention will be described below with reference to the attached drawings. Here, a sandwich packaging bag for a triangular sandwich will be described as an example. That is, this packaging bag is made by overlapping a pair of plastic film sheets 10, 1, both of which have narrow sides toward the tips, and sealing the three sides to form a bag body.

[0023] In this case, when forming the bag, a predetermined range of the tip of the sheet is left as a tab portion 4 that does not form a bag portion, and the rear end of the sheet is left as an opening for inserting food. Specifically, a top sealed portion 2 is provided along a line that crosses both sides of the sheet at the start point of the tab portion 4, bonding the sheets together, and side sealed portions 3A, 3B are provided by bonding both sides of the sheets behind the top sealed portion, forming three sealed portions of the bag. The thicknesses of a pair of inclined surfaces A and B facing each other with folds A1, A1 and B1, B1 are determined by the width of the top sealed portion 2, and the basic shape of the bag is completed by expanding the bag into a plate-like triangle with side surfaces C, C forming a triangle. Here, heat sealing is used as the bonding means.

[0024] Here, for the pair of sheets 10, 1 made of plastic film, anti-fog heat seal OPP (Toyobo P5260) 35μ is used.

[0025] In the present invention, one of the sheets 10 on the side where the opening means is provided has opening guide lines 7, 8 formed of a top edge 7 and left and right edges 8, 8 hanging down from the left and right sides of the top edge, as well as a perforation line, in an area starting from the top sealing portion 2 of the bag-forming area and continuing to the rear of the sheet. Here, the top edge 7 is a perforation and the left and right edges 8, 8 are perforations. The top edge 7 has a mountain shape with its left and right lower ends continuing to the left and right edges 8, 8.

[0026] In this specification, the term "rear of the seat" refers to the direction of the opening of the bag into which the sandwich is inserted.

[0027] In the figure, reference numeral 6 denotes a cover tape made of a plastic film that covers the tear guide lines 7, 8 and whose tip reaches above the tab 4. This cover tape 6 is partially weakly heat sealed to the surface of one of the sheets 10, and the weakly heat sealed area is composed of a linear heat sealed area S1 that is located on the tear guide line and is wider than the tear guide line, and a linear heat sealed area S2 that starts from the upper edge of the tear guide line 7 and is located between the left and right edges 8, 8. In addition, the upper end of the cover tape 6 is an unsealed area located above the upper end of the heat seal line S1, which provides a gripping margin when opening.

[0028] Here, the cover tape 6 has a width minus 20 mm from the width of the top sealing portion 2 that separates the header portion 4 from the main body portion that contains the contents. The cover tape 6 is coated with a heat sealant to adjust the strength of the heat seal to an openable strength. The material of the cover tape 6 is any of OPP, PET, and ONY, which are heat-resistant and stretched films with sufficient stiffness, and can be heat-sealed to an openable strength by heat seal coating. Here, OPP 30 to 40 μm is assumed in terms of stiffness and price.

[0029] In the above-mentioned bag, by inserting a triangular sandwich into the bag, the bag is expanded three-dimensionally into a plate-like triangle in which the thickness of a pair of opposing slopes is determined by the width of the top sealing part. In this case, when opening the bag, if the non-heat sealed portion of the upper end of the cover tape 6 that serves as the gripping margin is pinched and pulled up, one sheet 10 is pulled up by the cover tape since a portion of it is heat sealed to the cover tape 6.

[0030] In the above case, since the heat seal portion S1 is a line that is located on the opening guide lines 7 and 8 and is wider than the opening guide lines, one of the sheets near the opening guide lines is pulled up.

[0031] On the other hand, since there is a linear heat seal area S2 between the left and right sides 8, 8 starting from the upper side 7 of the tear guide line, one sheet 10 is also pulled up at this area. In such a case, a force is applied to one sheet near the tear guide line, which tends to pull it up from the outside of the area surrounded by the tear guide line to the inside. As a result, the area surrounded by the tear guide lines 7, 8 is broken at the tear guide line and pulled up together with the cover tape 6, while the outside of the area surrounded by the tear guide line is a weak heat seal, so the cover tape is peeled off and does not interfere with the above action.

[0032] 5 is a diagram showing another embodiment of the present invention. In this embodiment, the upper side 7 of the opening guide line is a straight line whose left and right ends continue to the left and right sides 8, 8. [Explanation of symbols]

[0033] S1 Heat seal area S2 Heat seal area 1 sheet 2A Adhesive wire for top sealing 2B Adhesive wire for top sealing 3A Side sealing part 3B Side sealing part 4 Tabs 6 Cover Tape 7 Top of opening guide line 8. Left and right sides of opening guide line 10 Sheets

Claims

1. A sandwich packaging bag is formed by overlapping a pair of plastic film sheets, bonding the sheets together by heat sealing along a line that crosses both sides while leaving a predetermined range of the tip of each sheet as a tab, forming a top sealing portion where the sheets are bonded together along a line that crosses both sides while leaving a predetermined range of the tip of each sheet as a tab, and forming a bag body that is sealed on three sides with side sealing portions where both sides of the sheets rearward of the top sealing portion are bonded together, one of the sheets is provided with easy-opening means for tearing the bag body, and the bag body is expanded into a plate-like three-dimensional shape that follows the outer shape of the sandwich by inserting a sandwich through an opening at the rear end of the bag body, An opening guide line is provided in a region starting from the vicinity of the top sealing portion of the bag-forming region of one of the sheets and continuing to the rear of the sheet, the opening guide line being made up of a cut and a perforation line formed by a top edge and left and right edges extending downward from the left and right sides of the top edge; A plastic film cover tape covering the tear guide line and having a tip that reaches the tab is partially weakly heat sealed to the surface of one of the sheets, The sandwich packaging bag is characterized in that the weak heat seal portions are a line that is located on the opening guide line and is wider than the opening guide line, and a line that starts from the upper side of the opening guide line and is located between the left and right sides.

2. 2. The sandwich packaging bag according to claim 1, wherein the upper side of the opening guide line has a mountain shape whose left and right lower ends are continuous with the left and right sides.

3. 2. The sandwich packaging bag according to claim 1, wherein the upper side of the opening guide line is a straight line having both ends continuing to the left and right sides.

4. 3. The sandwich packaging bag according to claim 1, wherein the upper side of the opening guide line is a notch and the left and right sides are perforated lines.

Images