JPH059304Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for preventing cracking of a liquid container containing a liquid such as milk or juice, particularly a multilayered liquid container.

(Prior art) Conventional containers for liquids made of paper coated with thermoplastic resin, especially large-capacity containers, are made of thick paper in consideration of conditions such as durability and shape retention. It is formed by However, when such thick paper is used, it has the disadvantage that it is susceptible to cracks and cracks due to folding of the paper during container molding.

In particular, the corners of containers formed by stacking three or more layers of paper are not only prone to cracks and cracks when the paper is folded, but also cracks in the corners of containers when external force is applied to the container even after the container is formed. It had the disadvantage of being prone to cracking and cracking. In any case, these cracks and cracks cause leakage of the contents, which is inconvenient.

(Problems to be Solved by the Present Invention) The purpose of the present invention is to provide a structure for preventing cracking of containers formed from thick paper as described above, especially containers for liquids composed of multiple layers, when folded and after the container is formed. This is what we are trying to provide.

(Means for Solving the Problems) In order to achieve this object, the crack prevention structure for liquid containers according to the present invention is a multilayer structure formed by heat-sealing three or more layers of paper coated with thermoplastic resin. At the corner of the liquid container, appropriately cut out the end of the paper panel disposed inside the corner,
A hollow part 9 is formed inside the corner part.

(Function) Appropriately cut out the end of the paper panel placed inside the corner of the liquid container formed by heat-sealing three or more layers of paper panels coated with thermoplastic resin,
Since the hollow part 9 is formed inside the corner, the hollow part 9 absorbs stress when the multilayer panel is bent during container molding, and direct force is applied to the corner (innermost or outermost paper panel). No cracks or cracks occur because there is no addition of

Further, even if an external force is applied after the container is formed, due to the presence of the hollow part 9, no force is directly applied to the corners (to the innermost or outermost paper panels), and no cracks or cracks occur.

Furthermore, since the fold line surrounding the empty space 9 is formed as a thick fold line, when folding the multilayer paper panel during container molding, the thick fold line will be slightly misaligned due to external force, so the tensile force will be reduced and the corner No cracks or cracks will occur in the parts.

Further, even after the container is formed, when an external force is applied, the folding position of the thick fold line is slightly shifted, and the tensile force is reduced, so that no cracks or cracks occur at the corners.

In particular, due to the synergistic effect of stress absorption by the hollow portion 9 and misalignment of the thick folded line, cracks and cracks at the corners can be reliably prevented.

(Example) Examples of the present invention will be described below based on the attached drawings.

First, the crack prevention structure according to the present invention is implemented on the top of a liquid container. Figure 1 is a perspective view of the top of the liquid container, Figure 2 is an exploded inner view of the same, and Figure 3 is a sectional view of the same. Yes (first embodiment).

That is, by paper coated with thermoplastic resin,
Through the longitudinal fold line 20, the side panels 1, 2, 3, 4
are formed continuously in the lateral direction, and the side panels 1, 2, 3,
Top panels 5, 6 are formed above 4. Furthermore, joint panels 7 (including 7a and 7b) are formed on the sides of the side panel 1 and the top panel 5 via vertical fold lines 20a and horizontal fold lines 21, respectively.

One of the top panels 5, 5 has triangular panels A, B formed by inclined fold lines 22 of an isosceles right triangle whose base is the transverse fold line 21a. Further, the other top panels 6, 6 are formed into a rectangular shape with a transverse fold line 21 interposed therebetween. A protruding panel D is formed above the top panels 5 and 6 via a horizontal fold line 23 and a vertical fold line 20 that connect the vertices of the triangular panels A and A and extend approximately horizontally. It has a vertical fold line 24 extending above the apex of panel A.

As shown in the second figure, a vertically long notch 8 is formed at the upper side edge of the protruding panel D and the top panel 6 to be joined to the joining panel 7. Notch 8
The length in the vertical direction is slightly longer than twice the height (length in the vertical direction) of the protruding panel D.

In addition, the broken line shown as a thick line in the figure is formed to be a thicker broken line than usual. At least the fold line surrounding the empty part 9 formed inside the corner is formed into a thick fold line. Also, the fold lines of the inner paper panels that are folded over and over are made into thick fold lines.

The reason for this is that when folding panels over and over the fold line, external force causes a slight shift in the fold position of the thick fold line on the inner paper panel, which reduces the tensile force acting on the outer paper panel and prevents cracking. be.

Also, via the transverse fold line 23, the rectangular top panel 6,
The protruding panel D continuous with 6 has a protrusion 10 in part, and both ends of the protrusion 10 form curved steps 11.

The following shows the crack-preventing structure according to the present invention implemented on the bottom of a liquid container. Fig. 5 is a perspective view of the bottom of the liquid container, Fig. 6 is an exploded inner view of the same, and Fig. 7 is a sectional view of the same. (Second example).

Although there is a difference between the top and bottom parts, the basic panel pattern formed by the folded lines is the same as in the first embodiment.

That is, by means of a paper panel coated with thermoplastic resin, the side panels 1, 2,
3 and 4 are formed continuously in the lateral direction, and the side panels 1,
Bottom panels 5, 6 are formed below 2, 3, 4. Further, vertical fold lines 20a and horizontal fold lines 2 are provided on the sides of the side panel 1 and the bottom panel 5, respectively.
1, the joint panel 7 (including 7a and 7b)
is formed.

One of the bottom panels 5, 5 has triangular panels A, B, and C formed by inclined fold lines 22 of an isosceles right triangle whose base is the transverse fold line 21a. The other top panel 6, 6 is formed in a rectangular shape with a transverse fold line 21. A protruding panel D is formed below the bottom panels 5 and 6 via a horizontal fold line 23 and a vertical fold line 20 that connect the vertices of the triangular panels A and A and extend approximately horizontally. It has a vertical fold line 24 extending downward from the apex of panel A.

As shown in FIG. 6, a vertically long notch 8 is formed at the lower side edge of the protruding panel D and the top panel 6 to be joined to the joining panel 7. Notch 8
The length is slightly longer than the sum of the height (length in the longitudinal direction) of the protruding panel D and the height (length in the longitudinal direction) of the top panel 6.

In addition, in FIG. 6, the folded line indicated by a thick line is formed as a thicker folded line than usual, and that at least the folded line surrounding the hollow part 9 formed inside the corner is formed as a thick folded line. Further, the folding line of the inner paper panel to be folded over and over is a thick folding line, as in the case of the first embodiment, and the reason for this configuration is also as described above.

Furthermore, FIGS. 9 and 10 show the crack prevention structure according to the present invention implemented on the bottom of another liquid container, and FIG. 9 is an exploded inner view of the bottom of the liquid container, and FIG. It is the same sectional view (3rd Example).

In this case, the basic panel pattern formed by the folded lines is the same as that in the second embodiment, so its explanation will be omitted. Similar structures are given the same reference numerals as in the second embodiment.

The difference is that an inclined fold line 25 is formed on the joining panel 7 (third embodiment), and that the part of the fold line of the paper panel that is formed as a thick fold line is different.

As shown in FIG. 9, the notch 8 is formed at the lower side edge of the protruding panel D and the bottom panel 6 to be joined to the joining panel 7, and the length of the notch 8 is the height of the protruding panel D ( It is slightly longer than the sum of the height (length in the vertical direction) and the height (length in the vertical direction) of the rectangular flap 6.

The assembly of the top or bottom of the liquid container shown in the first to third embodiments described above is carried out in accordance with a known method.

That is, first, the joining panel 7 is joined to the side panel 4, the top panel 6, and the protruding panel D (in the case of the bottom, the side panel 4, the bottom panel 6, and the protruding panel D), and the rectangular top panels 6, 6 are joined to each other. While bending the slanted fold line 22 inward, the inner surfaces of the triangular panels B and C are heat-sealed to the inner surface of the triangular panel A. Further, the protruding panel D is folded outward from the vertical fold line 24 to stand up vertically, the inner surfaces are heat-sealed to each other (see Fig. 12), and the raised portion thus formed is folded inwards from the transverse fold line 23 to make it stand up vertically. Place it upside down and heat seal it. Further, the triangular ears protruding from the side of the container may be bent onto the side surface of the container (in the case of the bottom, the lower surface of the container) and heat-sealed (see FIGS. 1 and 5).

Note that at the top of the container in the first embodiment, the transverse fold line 2
3, the protruding panel D that is continuous with the square top panels 6, 6 has a protrusion 10 in part (see Fig. 12), so the protrusion 10 is located upward (outermost) in the upright part. Turn it upside down and heat seal. In this case, both ends of the protrusion 10 are curved steps 11, and the steps 11 are smaller than when they are formed at right angles.
Less likely to cause cracks.

FIG. 4 shows a cross-section of the top, which has the same basic structure as the top of the first embodiment, but without forming the hollow part 9 due to the notch. In this case, there is a tear at the outermost corner n. Easy to enter.

Further, FIG. 8 shows a cross section of the bottom in a case where the basic structure is the same as that of the bottom of the second embodiment, but the hollow part 9 is not formed by the notch, and in this case, there is a tear at the innermost corner n. Easy to enter.

Furthermore, FIG. 11 shows a bottom section in a case where the basic structure is the same as that of the bottom of the third embodiment, but the hollow part 9 is not formed by the notch, and in this case, there is a tear at the innermost corner n. Cheap.

(Effects) As mentioned above, according to the present invention, by forming an appropriate hollow part 9 inside the corner, even if a thick paper panel is used, there will be no cracks or cracks in the corner of the container. Therefore, leakage of the contents can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the top of a liquid container in which the liquid container crack prevention structure according to the present invention is implemented (first embodiment), Fig. 2 is an exploded inner view of the top, and Fig. 3 is the same as Fig. 1. Top cross-sectional view along line xx at 4th
The figure is a sectional view of the top without a hollow part, FIG. 5 is a perspective view of the bottom of a liquid container in which the liquid container crack prevention structure according to the present invention is implemented (second embodiment), and FIG. 6 is the same. FIG. 7 is a sectional view of the bottom taken along the line xx in FIG. 5, FIG. 8 is a sectional view of the bottom without a cavity, and FIG. Implemented crack prevention structure (3rd example)
FIG. 10 is a sectional view of the bottom of the liquid container, FIG. 11 is a sectional view of the bottom without a cavity, and FIG. 12 is an assembled state of the top of the container of the first embodiment. The perspective view and FIG. 13 are an enlarged inner view showing a protrusion (part) of the protrusion panel at the top of the container of the first embodiment. 8...notch, 9...empty part.

Claims (1)

[Claims for Utility Model Registration] (1) Paper placed inside the corner of a multilayer liquid container formed by heat-sealing three or more layers of paper coated with a thermoplastic resin. A structure for preventing cracking of a liquid container, characterized in that an end of a panel is appropriately cut out to form a cavity inside the corner. (2) Utility model registration claim 1, characterized in that the fold line surrounding the empty space is formed into a thick fold line.
Crack-preventing structure for liquid containers described in section. (3) The crack-preventing structure for a liquid container according to claim 1, wherein the fold line of the inner paper panel to be folded over and over is formed as a thick fold line.