JP3848469B2 - Paper container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a paper container that contains a liquid, powder, granule or the like provided with a spout member made of synthetic resin.
[0002]
[Prior art]
Conventionally, for example, paper containers that contain milk, juice, soft drinks, liquor and the like have been used.
The spouts of these liquid paper containers are formed, for example, in a structure in which a mounting hole is formed in the upper wall surface of the container and a mouth member of a synthetic resin molded product is attached to the opening, or in a rectangular tube shape. A structure is known in which an upper structure having a spout is integrally fixed to a paper box.
In the former, since the upper surface of the paper container has a roof shape, the spout cannot be arranged in the center.
In the latter case, for example, as shown in FIG. 13, the body portion 22 of the paper container 21 is sandwiched between the pressure receiving shaft 27 and the heating pressure mold 28, so that a recess 24 is formed on the upper surface so as to surround the spout 23, and dust or There is a drawback that water tends to accumulate.
Further, there is a method of inserting the container body 22 into the injection molder and bonding the upper structure 25 to the inserted container body 22 at the same time as injection molding, but an expensive molder and mold cost are required, The speed is slow and the cost is inevitable. In addition to the cost, in this injection molding method, if the bottom part of the main body is molded in advance, it is almost impossible to form the bottom part in a subsequent process under the limited conditions with the paper container. In order to mold the bottom after the top has been molded, current technology cannot mold a flat bottom that can withstand use.
Furthermore, in a small container such as a paper container containing soft drinks, the solid spout member is required regardless of the size of the container, and the cost burden of the solid spout member for the small container is large. There were difficulties.
The same problem has been encountered in paper containers for storing fluid solids such as powders and granules.
[0003]
[Problems to be solved by the invention]
The present invention was devised as a result of intensive studies in view of these circumstances, and its main problem is to provide a paper container in which a spout member can be easily attached to the upper center of the paper container. It is an object.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides
An opening with a peripheral wall standing upright is formed in the center of the upper surface of the box body, and a substantially cylindrical spout member made of synthetic resin and having a vertical through hole is fitted into the opening,
The spout member has a flange projecting outward at a midway position, and the upper and lower portions extend in a cylindrical shape across the flange, and the lower portion serves as a connecting portion.
The connecting portion is inserted into the vertical through hole of the opening of the box body, and the flange is hooked on the upper edge of the opening so as to close the opening, and the connecting portion of the spout member is connected to the peripheral wall of the opening. It is fixed to at least a part of the inner wall surface by heat welding,
A technical measure is taken in which the flange is folded back to the upper edge of the opening of the box body and fixed by thermal welding or the like.
[0005]
Moreover, in invention of Claim 2, in the said structure,
A technical means is provided in which a cap mounting part is formed on the upper portion of the flange of the spout member, and is formed with a cylindrical protrusion and a cap mounting means formed on the outer periphery.
[0006]
In the invention of claim 3,
The spout member has a technical means in which a flange projecting outward is formed at an upper portion, and a connecting portion is provided at a lower portion of the flange.
[0008]
In the invention of claim 4, in the invention of claim 3,
A technical means is adopted in which the top surface of the flange is used as a seal mounting surface, and a peelable seal is attached to the seal mounting surface.
[0009]
Moreover, in invention of Claim 5, in each said structure,
Of the vertical and horizontal side wall surfaces connected through the mountain fold folding line, the mountain fold folding line is formed horizontally near the upper side of all the wall surfaces, and diagonally above the opposite side wall surface. An inclined fold line composed of a letter-shaped valley fold, a central fold line composed of a valley fold horizontally connecting the tips thereof, and a vertical fold line of a valley fold extending vertically upward from the tip, and adjacent sides facing each other The technical means of forming a horizontal fold line on the wall surface and extending horizontally along the lateral width of the side wall surface at the same height as the tip of the inclined fold line, and forming an opening by bending along the fold line. Have taken.
Furthermore, in the invention of claim 6,
The technical means that the said opening part is formed in the upper part of the surrounding wall which becomes a substantially truncated pyramid shape in the upper part of a box main body is taken.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the paper container of the present invention will be described below with reference to the drawings.
A paper container 1 shown in FIG. 1 is a container for storing fluid such as liquid, powder, fluid, etc., and is a box body 1A having a flat square bottle shape with a side of about 7 cm by folding paper. A connecting portion 5 of a spout member 3 made of a thermoplastic synthetic resin is bonded to the inside of the opening 2 set at the upper portion and surrounded by the peripheral wall portion 2A, thereby forming a mouth portion.
[0011]
The spout member 3 is a substantially cylindrical body having a vertical through-hole 3A. A flange 4 is formed at an intermediate portion of the height, a connecting portion 5 is provided at the lower portion of the flange 4, and a lid (cap) (not shown) is provided at the upper portion. A cap attaching portion 6 to be screwed or locked is formed.
In the case of the illustrated example, the cap attachment portion 6 is formed to have a smaller diameter than the connecting portion 5 and is formed so as not to contact the heating pressure die 8 during bonding described later.
In addition, although screwing is used as the cap attachment means, the concave / convex engagement with the cap, the structure in which a plug is inserted into the spout member instead of the cap and the cap is sealed, or the seal is sealed instead of the cap. A structure that stops may be used.
[0012]
Next, the structure of the box body 1A having the opening 2 is shown in FIG.
In the developed view of the box main body 1A, the box main body 1A extends horizontally in series near the vertical and lateral side wall surfaces 11, 12, 13, and 14 which are peripheral walls of the openings connected via the corner folding lines L1 to L4 of the mountain fold. A reference fold line (mountain fold) L5 is formed.
Further, a center fold line (valley fold) horizontally connecting between the tip ends of the pair of side wall surfaces (11 and 13 side wall surfaces in the illustrated example) diagonally in a diagonal shape (valley fold) L6, L6 and the tip thereof. ) L7 and a vertical fold line (valley fold) L8 extending vertically upward from the tip.
[0013]
Further, the side wall surfaces 12 and 14 adjacent to the side wall surfaces 11 and 13 are formed with a horizontal folding line L9 extending horizontally along the lateral width of the side wall surfaces 11 and 13 at the same height as the tip of the inclined folding line L6. .
Therefore, a square tube is formed by being folded along the corner folding lines L1 to L4.
Then, the reference fold line L5 is folded in a mountain, the upper portions of the side wall surfaces 11 and 13 are folded inward, the valleys are folded along the inclined fold line L6, and the upper portion is bonded to the adjacent side wall surface, and the upper side from the central fold line L7. Forms a peripheral wall portion 2A by vertically standing a portion surrounded by a pair of vertical folding lines L8, L8.
[0014]
At the same time, the side wall surfaces 12 and 14 adjacent to each other fold the horizontal fold line L9 so that the upper part thereof stands vertically to form the other peripheral wall portion 2A.
When the paper container 1 is assembled by folding in this way, the upper portion of each side wall surface is inclined toward the center, and the peripheral wall portion 2A rises vertically, and an opening portion 2 having a flat rectangular opening is formed at the upper end. The
In addition, the bottom part sealed by the appropriate well-known bending means is formed in the lower part of this paper container.
[0015]
In the plan view of the box main body 1A shown in FIG. 2, the folded portions 2B and 2B are formed by contacting the corner corners of the peripheral wall 2A of the opening 2 with the inner surfaces by an appropriate width.
As a result, the opening area of the opening 2 is narrowed as shown in the figure. Therefore, when the connecting portion 5 of the spout member 3 is inserted into the narrowed opening 2, the mode shown in FIG. 3 is obtained.
In FIG. 3, the flange 4 formed at the midway position of the spout member 3 is formed in a size that covers the opening 2.
[0016]
Next, as shown in FIGS. 2 and 3, the pressure receiving shaft 7 is closely disposed in the longitudinal through hole 3 </ b> A having a taper of the spout member 3, and the connection portion 5 of the spout member 3 is placed in the opening 2 of the box body 1 </ b> A. Along the side.
As shown in FIG. 3, when the heating pressure mold 8 is pressed from the outside of the opening 2 of the box body 1 </ b> A toward the pressure receiving shaft 7, it is heated by the heating pressure mold 8 and connected to the spout member 3. 5 is softened and is brought into close contact with the inner wall surface of the peripheral wall portion 2A in the opening 2 of the box body 1A by pressurization and sealed.
In addition, if the adhesion part of a main body and a spout member is separately heated, for example with hot air etc., the heating pressure type | mold 8 can be used as an apparatus which supplies the pressure and cooling required for adhesion | attachment.
[0017]
Accordingly, when the heating pressure mold 8 is detached, the surface of the molten connecting portion 5 is cured, and the inner surface of the opening 2 of the box body 1A and the connecting portion 5 of the spout member 3 are bonded together.
Thus, even if the diameter of the spout member 3 is, for example, 1 cm or 5 cm, the pressure receiving shaft 7 is inserted into the vertical through-hole 3A, so that the mounting work can be performed continuously and quickly.
Moreover, even if the diameter of the spout member 3 is small, the length can be increased, and as a result, the joining length between the connecting portion 5 of the spout member 3 and the inner surface of the opening 2 of the box body 1A is set long. Therefore, even a small spout member 3 can be bonded with high adhesive strength.
[0018]
The pressure receiving shaft 7 is preferably at a low temperature of room temperature or lower. For example, the inside of the pressure receiving shaft 7 can be made hollow to allow the coolant to flow.
The heating pressure die 8 only needs to have a temperature sufficient to melt the thermoplastic synthetic resin of the spout member 3, and a heater and a temperature sensor can be disposed inside or outside. The shape of the heating pressure die 8 can also be an aspect in which, for example, a plane substantially horseshoe shape is advanced and retracted from two or multiple directions toward the pressure receiving shaft 7. The power is arbitrary such as human power, electric power, and fluid pressure.
[0019]
Next, FIGS. 4 and 5 show an embodiment of a paper container.
A molding groove 8 </ b> A is formed on the pressure surface of the heating pressure mold 8 in accordance with the position of the flange 4 of the spout member 3.
The same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.
As the method of forming the mouth portion, the pressure receiving shaft 7 is fitted into the longitudinal through hole 3A of the spout member 3 by bringing the opening 2 of the box body 1A close to the connecting portion 5 of the spout member 3 as described above. In this state, the heating pressure mold 8 is moved from the outside of the flange 4 toward the pressure receiving shaft 7 and pressurized.
[0020]
In this case, the molding groove 8A comes into contact with the tip of the flange 4 and is bent downward while being softened.
The softened flange 4 is attached so as to cover the outer end edge of the opening 2, has an outer shape that follows the shape of the molding groove 8 </ b> A, and hardens when the heating pressure die 8 is detached.
[0021]
5, the inner surface of the peripheral wall portion 2A of the opening 2 is bonded to the connecting portion 5 of the spout member 3, and the upper edge of the peripheral wall portion 2A is bonded 4A by bending the flange 4 so as to be integrated. It is sealed.
Therefore, in this embodiment, since the adhesive force can be strengthened even if the length of the connecting portion 5 of the spout member 3 is shortened, the spout member 3 can be formed in a small size.
In addition, the outer periphery of the cap attaching part 6 is set to a size that is separated so as not to contact when heated by the heating pressure die 8.
[0022]
Next, FIGS. 10 and 11 show different embodiments of the paper container in which the peripheral wall forming the opening 2 is cut out at the inclined portion at the top to make the shape closer to the image of a bottle.
In the paper container 1, in the developed view of FIG. 11, each of the upper portions of the vertical and horizontal side wall surfaces 11, 12, 13, and 14 serving as the peripheral walls of the openings connected via the corner fold lines L1 to L4 of the mountain folds. The separation piece is cut out in the shape of the illustrated example in which a rectangle is connected to a substantially trapezoidal shape from a midway position, and the reference fold line (mountain fold) L5 is formed at the base.
Further, a trapezoidal portion of a pair of opposing side wall surfaces (the side wall surfaces 11 and 13 in the illustrated example) has an oblique C-shaped inclined fold line (valley fold) L6, L6 and a central fold line that horizontally connects the tips thereof ( (Valley fold) L7 is formed, and a vertical fold line (valley fold) L8 extending vertically upward from the tip is formed in the rectangular portion.
[0023]
Further, the side wall surfaces 12 and 14 adjacent to the side wall surfaces 11 and 13 extend horizontally along the lateral width of the rectangular portion of the upper separation piece of the side wall surfaces 11 and 13 at the same height as the tip of the inclined folding line L6. A horizontal folding line L9 is formed.
Accordingly, in this case as well, the square tube is formed by mountain folding along the corner fold lines L1 to L4 as in the above-described embodiment.
Then, the reference fold line L5 is folded in a mountain, the upper portions of the side wall surfaces 11 and 13 are folded inward, the valleys are folded along the inclined fold line L6, and the upper portion is bonded to the adjacent side wall surface, and the upper side from the central fold line L7. Forms a peripheral wall portion 2A by vertically standing a portion surrounded by a pair of vertical folding lines L8, L8.
[0024]
At the same time, the side wall surfaces 12 and 14 adjacent to each other fold the horizontal fold line L9 so that the upper part thereof stands vertically to form the other peripheral wall portion 2A.
When the connecting portion 5 of the spout member 3 is inserted into the opening 2 assembled by bending in this way, the mode shown in FIGS. 10A and 10B is obtained, which is a mode similar to the shape of the bottle.
[0025]
FIG. 12 further shows a development view of a different embodiment in the case where the paper container 1 imitating a bottle shape has a rectangular cross section.
In this case, in order to make the spout member (not shown) stand up a peripheral wall having a height equal to the center of the upper surface of the box body, the heights of the partial pieces of the adjacent side wall surfaces are different, The positions of the broken line L7 and the horizontal folded line L9 are different.
Since other configurations are the same as those in the above embodiment, the description thereof is omitted.
In this figure, the configuration of the bottom of the box body is omitted.
[0026]
Next, FIG.6 and FIG.7 shows the paper container of a different Example provided with the spout member 3 closed without using a cap and a stopper.
The spout member 3 is a substantially cylindrical body having a vertical through-hole 3 </ b> A. A flange 4 is formed on the upper portion of the spout member 3, and a connecting portion 5 is suspended below the flange 4.
Other configurations are the same as those in the above embodiments.
A seal mounting surface 6 is formed on the top surface of the flange 4.
On the seal mounting surface 6, a seal S serving as a lid after liquid filling is affixed to seal the opening of the mouth member 3.
In the figure, S1 is a tension strip for peeling the seal.
Also in this case, instead of the seal, a structure in which a stopper is inserted into the spout member and sealed, and other sealing means can be used.
[0027]
Also in this case, when the heating pressure mold 8 is pressed from the outside of the opening 2 of the box body 1A toward the pressure receiving shaft 7 in accordance with the above embodiment, the connecting portion of the mouth member 3 is heated by the heating pressure mold 8. 5 is softened and is brought into close contact with the contact surface of the inner side surface of the opening 2 of the box body 1A by pressurization.
Accordingly, when the heating pressure mold 8 is detached, the surface of the molten connecting portion 5 is cured, and the inner surface of the opening 2 of the box body 1A and the connecting portion 5 of the spout member 3 are bonded together.
Further, similarly to the second embodiment, as shown in FIG. 8, the front end of the flange 4 may be bent along the upper edge of the opening 2 and heat-welded.
[0028]
The present invention is not limited to the above-described embodiments, and the opening may be formed by another folding line or folding method.
Further, the opening may not be square or rectangular in cross section, and may be circular, elliptical, or polygonal.
The spout member and the inner wall surface of the opening may be bonded on one side or on the entire surface.
In short, it is a matter of course that various design changes can be made without changing the gist of the present invention, and the contents are not necessarily limited to liquids, and are not particularly limited to powders, granules, granules and the like.
[0029]
【The invention's effect】
As described above, according to the present invention, a paper container having a spout can be easily formed by inserting a spout member made of synthetic resin into an opening of a paper box body and integrating them by heat welding or the like. .
Further, even if the spout member is a thin tubular member, it can be easily fixed to the opening of the box body, so that a small mold is sufficient in terms of production, and the cost burden can be reduced.
Moreover, since a spout member can also be made small, a spout can be provided also in a small paper container.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a spout part of a paper container.
FIG. 2 is a plan view showing a spout portion in FIG.
FIG. 3 is a cross-sectional view showing the spout part forming method of FIG. 1;
FIG. 4 is a cross-sectional view showing a method for forming a spout part of an embodiment of a paper container.
FIG. 5 is a cross-sectional view of the spout part of FIG.
FIG. 6 is a cross-sectional view showing a method for forming a spout part of a paper container according to another embodiment.
7 is a cross-sectional view of the spout portion of FIG.
FIG. 8 is a cross-sectional view showing another embodiment in which a flange is fixed to an opening.
FIG. 9 is a plan view showing the unfolded state of the box body. FIG. 10 is a side view of a paper container of a different embodiment, (a) is a right side view with a stopper, and (b) is a left side. FIG.
FIG. 11 is a development view of FIG. 10;
FIG. 12 is a development view of a different embodiment of a bottle-shaped paper container.
FIG. 13 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper container 1A Box main body 2 Opening part 2A Peripheral wall part 2B Folding part 3 Spout member 3A Vertical through-hole 4 Flange 5 Connection part 6 Cap attaching part 7 Pressure receiving shaft 8 Heating pressure type 8A Molding groove

Claims (6)

An opening with a peripheral wall standing upright is formed in the center of the upper surface of the box body, and a substantially cylindrical spout member made of synthetic resin and having a vertical through hole is fitted into the opening,
The spout member has a flange projecting outward at a midway position, and the upper and lower portions extend in a cylindrical shape across the flange, and the lower portion serves as a connecting portion.
The connecting portion is inserted into the vertical through hole of the opening of the box body, and the flange is hooked on the upper edge of the opening so as to close the opening, and the connecting portion of the spout member is connected to the peripheral wall of the opening. It is fixed to at least a part of the inner wall surface by heat welding,
The paper container is characterized in that the flange is folded back to the upper edge of the opening of the box body and fixed by heat welding or the like.   2. The paper container according to claim 1, wherein a cap attaching portion is formed on the upper portion of the flange of the spout member and has a cylindrical protrusion and a cap attaching means formed on the outer periphery.   3. The paper container according to claim 1, wherein the spout member has a flange projecting outward at an upper portion thereof and a connecting portion at a lower portion of the flange. .   The paper container according to claim 3, wherein the top surface of the flange is used as a seal mounting surface, and a peelable seal is attached to the seal mounting surface. Of the vertical and horizontal side wall surfaces connected through the mountain fold folding line, the mountain fold folding line is formed horizontally near the upper side of all the wall surfaces, and diagonally above the opposite side wall surface. An inclined fold line formed of a letter-shaped valley fold and a central fold line formed of a valley fold that horizontally connects the tip ends thereof, and a vertical fold line of a valley fold extending vertically directly from the tip end,
A side fold line extending horizontally along the lateral width of the side wall surface corresponding to the tip of the inclined fold line is formed on the adjacent side wall surface opposite to the side wall surface,
The paper container according to any one of claims 1 to 4, wherein an opening is formed by bending along the fold line.   The paper container according to any one of claims 1 to 4, wherein the opening is formed in an upper part of a peripheral wall having a truncated pyramid shape in an upper part of the box body.

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