JP6630224B2 - Easy-open paper containers - Google Patents

Description

  The present invention relates to improvements in paper containers widely used as containers for liquid beverages such as milk and juice.

  As a paper container for liquid beverages such as milk and juice, a container made of a paper material in which a thermoplastic resin film such as polyethylene is laminated on both sides is widely used. When the capacity is 500 mL or more, a gable top type is mainly used, and when the capacity is 200 mL or less, a brick type is mainly used.

  As is well known, the upper end of a gable-top type paper container is a heat-sealed top seal portion. Is peeled off, and the spout is formed by pulling the center of the weld toward the front.

  However, the top seal portion of the paper container is firmly welded for the purpose of preventing liquid leakage, and a certain amount of force is required to peel it off. Also, if force is applied, the paper may tear in an unintended direction when peeling. Furthermore, the spout may be contaminated by bringing a fingertip into contact with the spout at the time of opening. As described above, the paper container has a disadvantage that the opening property is poor.

  Therefore, as disclosed in Patent Document 1, a special coating agent for peeling is applied to the top seal portion on the spout side to improve the openability of the paper container. However, there is a problem that the cost of the coating agent and the number of steps for the process management increase. Further, if the releasability of the top seal portion is too high, there is a problem that the original function of preventing liquid leakage is reduced.

  In the case of a brick-type paper container, a straw insertion opening is often formed, so that there is no high demand for improving the openability as compared with the gable-top type. However, if it is desired to open the mouth after use and wash the inside, it is desired that the seal can be easily opened.

JP 2013-86865 A

  Accordingly, an object of the present invention is to solve the above-mentioned conventional problems and to provide an easily-openable paper container having improved openability without using a coating agent for peeling and without reducing the function of preventing liquid leakage. It is to be.

In order to solve the above-mentioned problem, an easily-openable paper container of the present invention is provided with a dashed portion for cutting off the upper end portion of the top seal portion at the time of opening on the top seal portion of the paper container over the entire width. On the spout side of the seal portion, the upper side of the broken line portion is a heat welded portion, and the lower side is a non-heat welded portion. On the anti-spout side, upper and lower sides of the broken line portion are heat welded portions.

Preferably, a cut is formed at the beginning of the broken line . The paper container may be of a gable-top type, and in a preferred embodiment, the broken line portion is formed in a four-sheet joining portion of a top seal portion. Further, the upper side of the broken line portion on the spout side may be a heat-welded portion consisting only of a laminate layer without a paper material .

The easily-openable paper container of the present invention has a dashed portion for cutting off the upper end portion of the top seal portion at the time of opening on the top seal portion of the paper container over the entire width, and the spout side of the top seal portion has the dashed portion. The upper part is a heat-welded part, the lower part is a non-heat-welded part, and the upper and lower sides of the broken line part are heat-welded parts on the anti-spout side. For this reason, if the upper end of the top seal portion is cut off from the broken line portion, the spout side has no heat-welded portion below the broken line portion or is formed only slightly, so that it is easily poured. A mouth can be formed.

  Further, in the easily-openable paper container of the present invention, the upper portion of the broken line portion and the upper and lower sides of the anti-spout side are heat-welded until the broken line portion is cut out, so that the liquid leakage preventing function does not deteriorate. Therefore, according to the present invention, the openability of the paper container can be improved without using a release coating agent and without lowering the function of preventing liquid leakage.

1 is a perspective view showing a gable-top type easily-openable paper container according to a first embodiment of the present invention. FIG. 2 is a development view of the easily-openable paper container of FIG. 1. It is a perspective view showing a reference embodiment of the present invention. It is a development view showing an important section of a 2nd embodiment of the present invention. It is a perspective view showing a 3rd embodiment of the present invention. FIG. 6 is a development view of the easily-openable paper container of FIG. 5. It is a reference perspective view showing a brick type paper container.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a perspective view showing a gable-top type easily-openable paper container according to a first embodiment of the present invention, and FIG. 2 is a developed view seen from the inner surface side. This easily-openable paper container is formed by bending a paper material in which laminated layers of a thermoplastic resin such as polyethylene are laminated on both front and back surfaces, and has a rectangular first panel 1, a second panel 2, and a third panel. 3. A quadrangular prism-shaped cylinder is formed by bending the fourth panel 4 at right angles to each other and heating and welding the fifth panel 5 formed at the end of the fourth panel 4 to the side end of the first panel 1. Form a shape.

  Bottom panels 7, 8, 9, and 10 are respectively connected to the lower portions of these panels via bottom horizontal fold lines 6. The bottom panel 8 and the bottom panel 10 are formed with two inclined valley fold lines 11 and 11, respectively. Are overlapped and heat-welded to form a bottom.

  In addition, upper panels 14, 15, 16 and 17 are respectively connected to upper portions of these panels via upper horizontal folding lines 13. Two inclined valley fold lines 18 and 18 are formed on the upper panel 14 and the upper panel 16, respectively. An isosceles triangular spout is provided between the sloping valley fold line 18 and the upper horizontal fold line 13 of the upper panel 16. A panel 19 is formed. An isosceles triangle-shaped patent panel 20 is formed between the inclined valley fold line 18 and the upper horizontal fold line 13 of the upper panel 14. Further, one inclined valley fold line 21 is formed on each of the upper panel 15 and the upper panel 17. These are folding lines for bending outward when opening. Each of these panels forms a well-known gable top.

  Top seal panels 24, 25, 26, and 27 are further provided on top of these upper panels 14, 15, 16, and 17 via a top horizontal fold line 23, respectively. These top seal panels are heated and welded after filling the internal solution to form a top seal portion for sealing the top of the paper container. The height of the top seal panels 25 and 27 is higher than the height of the top seal panels 24 and 26, and the welded portion in the upper half of the top seal panels 25 and 27 becomes a two-sheet joining section 28. The welded portions of the other top seal panels 24, 25, 26, and 27 form a four-sheet joining portion 29. Vertical folding lines 30 and 31 are formed at the centers of the top seal panels 24 and 26. The vertical fold line 31 is located at the upper end of the spout panel 19 and serves as a center of the spout.

The above structure is the same as that of a conventional gable-top type paper container. However, in the present invention, a broken line is formed on the top seal portion formed by the top seal panels 24, 25, 26, and 27 as shown in FIGS. A part 32 is formed. The broken line part 32 is formed in the four-sheet joining part 29 as shown, and is formed over the entire width of each top seal panel .

  The broken line portion 32 is for cutting off the upper end portion of the top seal portion at the time of opening, and it is preferable to form a cutout 33 at the start end thereof to facilitate cutting off. The broken line portion 32 may be formed by forming perforations to facilitate cutting, or may be formed by thinning a part of the paper material. In any case, the laminate layer made of the thermoplastic resin on the surface of the broken line portion 32 is left. The broken line portion 32 may be a dashed line or a two-dot chain line.

  Further, in the present invention, on the spout side of the top seal portion, the upper side of the dashed line portion 32 is a heated welded portion 35 (shown in black), and the lower side is a non-heated welded portion 36. On the opposite side of the spout, the upper and lower sides of the broken line 32 are heat welded portions 35. Specifically, as shown in FIG. 2, the lower side of the broken line portion 32 of the top seal panel 26 forming the spout is a non-heat-welded portion 36, and the adjacent top seal panels 25 and 27 have the broken line portion. The portion below 32 and closer to the top seal panel 26 than the upper ends of the inclined valley fold lines 21 and 21 was defined as a non-heat-welded portion 36. Further, the portion above the broken line portion 32 of the top seal panel 26, the portion of the top seal panels 25 and 27 adjacent to the portion other than the non-heat-welded portion 36, and the entire top seal panel 24 are heat-sealed portions 35. And

  The gable-top type easily openable paper container of the present invention configured as described above is used by filling a content liquid in the same manner as in the related art, and before opening, the top seal panels 24, 25, 26, and 27 are used. Since the portion above the broken line portion 32 is heat-welded, there is no risk of liquid leakage.

  At the time of opening, first, the upper part of the top seal part is cut out from the broken line part 32. Then, on the spout side, the heated welded portion 35 of the top seal panel 26 forming the spout is removed, and the non-heated welded portion 36 below the broken line portion 32 remains. For this reason, if the spout panel 19 centering on the vertical folding line 31 is drawn out to the near side, a spout (spout) can be easily formed. On the anti-spout side, the upper and lower sides of the broken line portion 32 are the heat welding portions 35, so that the content liquid does not flow out as in the conventional case.

In the first embodiment described above, the broken line portions 32 are formed on the spout side and the anti-spout side of the top seal portion. However, in the embodiment shown in FIG. 3, the broken line portion 32 is formed only on the spout side of the top seal portion .

Further, as in the second embodiment shown in FIG. 4, the upper side of the broken line portion 32 on the spout side of the top seal portion may be a heat welding portion 35 composed of only a laminate layer without a paper material.

Further, as in the third embodiment shown in FIGS. 5 and 6, the length of the non-heat-welded portion 36 can be shortened, and the spout can be downsized. However, in this case, the first panel 1 and the third panel 3 are formed to have a small width.

  Although not included in the scope of the present invention, FIG. 7 shows, as a reference diagram, a state in which a broken line portion 40 for cutting off the upper end portion of the top seal portion at the time of opening is formed in the top seal portion of the brick type paper container. Show. If the upper end of the top seal portion is cut off from the broken line portion 40 after use, the inside can be easily cleaned. In this case, a broken line portion 41 can be similarly formed at the bottom.

  As described above, according to the present invention, an easily openable paper container having improved openability without using a conventional coating agent for peeling and without reducing the liquid leakage prevention function. Can be provided.

DESCRIPTION OF SYMBOLS 1 1st panel 2 2nd panel 3 3rd panel 4 4th panel 5 5th panel 6 Bottom horizontal fold line 7 Bottom panel 8 Bottom panel 9 Bottom panel 10 Bottom panel 11 Inclined valley fold line 13 Upper horizontal fold line 14 Upper panel 15 Upper panel Reference Signs List 16 Upper panel 17 Upper panel 18 Inclined valley fold line 19 Spout panel 20 Patent panel 21 Inclined valley fold line 23 Top horizontal fold line 24 Top seal panel 25 Top seal panel 26 Top seal panel 27 Top seal panel 28 Two piece joining part 29 Four piece joining part 30 vertical fold line 31 vertical fold line 32 broken line part 33 cut 35 heated weld part 36 non-heat welded part 40 broken line part 41 broken line part

Claims (5)

In the top seal portion of the paper container, a dashed portion for cutting off the upper end portion of the top seal portion at the time of opening is formed over the entire width, and on the spout side of the top seal portion, the upper side of the dashed portion is a heat welding portion, and the lower side is a non-heated portion. An easily-openable paper container, wherein a heat-welding portion is provided, and upper and lower sides of the broken line portion on the anti-spout side are heat-welded portions. The easy-opening paper container according to claim 1 , wherein a cut is formed at a start end of the broken line portion . The easy-opening paper container according to claim 1, wherein the paper container is a gable top type . The easy-opening paper container according to claim 1, wherein the broken line portion is formed in a four-sheet joining portion of a top seal portion . The easy-opening paper container according to claim 1, wherein the upper side of the broken line portion on the spout side is a heat-welded portion made of only a laminate layer without a paper material .