JP3407414B2 - Square sleeve for liquid paper container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular sleeve for a liquid paper container for producing a flat top type or gable top type liquid paper container.

[0002]

2. Description of the Related Art A rectangular tubular sleeve for a liquid paper container is generally a base material sheet mainly made of paper such as paperboard, on which a gas barrier resin layer, a resin layer having a low odor and the like, and a metal such as aluminum. Use a sheet for liquid paper containers in which a foil layer or an appropriate treatment layer corresponding to the liquid content is laminated, and a sealant layer made of a heat-fusible resin is laminated on the surface layer, and punching or creasing or if necessary It is formed by applying an adhesive coating process.

A conventional rectangular tubular sleeve for a liquid paper container has, for example, as shown in a sleeve blank of FIG. 7, a first panel 1 and a second panel via parallel folds a, a, a, a. 2, a third panel 3, a fourth panel 4, and a fifth panel 5 that is connected to the outer edge of either the first panel 1 or the fourth panel 4 through a parallel fold a. The fifth panel 5 corresponds to an end portion adhering panel to be assembled and formed into a rectangular tubular sleeve, and has a width set narrower than other panels. In addition, 5a is the fifth
It is a folded plate for edge protection formed on the outer end of the panel 5 through a fold d parallel to the fold a.

The first panel 1, the second panel 2, the third panel 3, the fourth panel 4, and the fifth panel 5 have side wall plates 31,
It is provided with a rectangular tubular side wall portion A composed of 32, 33, 34 and 35.

A gable top type or flat top type top seal portion T (sloping roof type; gable top type or flat type; flat type flat type) is continuously provided on an upper portion of the side wall portion A of the rectangular tube through a fold b. A top seal portion formed so as to have an external appearance, and a spout portion C for pouring is attached if necessary), and a flat bottom is formed below the side wall portion A of the rectangular tubular body. The bottom seal portion B is provided continuously through the fold c.

As shown in FIG. 7, the top seal portion T includes an upper plate 41, an upper plate 43, which are connected to the upper portions of the side wall plates 31, 33 of the side wall portion A via folds b, and the upper plate 41. Or 4
3. A spigot mounting hole C that is provided in the approximate center of 3 as necessary.
(The spout is attached by adhering to the outer surface or by fitting and protruding from the inside of the container to the outside), and the upper plates 41, 4 are attached.
Gassho sticker plate 41 connected to the upper side of 3 through folds
a, 43a, and the side wall plates 32, 3 of the side wall plate A.
4 isosceles triangular plates 42 and 44 for folding, which are connected to each other via folds b, and connecting triangular plates 42a and 42a, which are connected to the upper sides of each of the triangular plates 42 via folds.
And connecting triangle plates 44a, 44a that are connected to each other on the isosceles upper side of the triangular plate 44 via folds b, and a continuous connection palm pasting plate 42 that is connected to the upper side of each connecting triangle plate via the folds.
b, 42b, 44b, 44b. Further, an upper sticking plate 45 continuously provided on the side wall plate 35 (sticking plate) via a fold b and a connecting sticking plate continuously provided on the upper side of the upper sticking plate 45 via a fold. 45b.

As shown in FIG. 7, the bottom seal portion B is provided with bottom plates 51 and 53, which are connected to lower portions of the side wall plates 31 and 33 of the side wall portion A through folds c, and below the bottom plate 53. A bottom sticking plate 53a continuously provided through folds, and the side wall portion A
Folding isosceles triangular plates 52 and 54 (inverted triangular plates) that are connected to the lower portions of the side wall plates 32 and 34 through folds c, and are connected to the lower sides of each of the triangular plates 52 through folds. Connecting triangular plate 52a, trapezoidal plate 52c, and connecting triangular plate 52
a connecting triangular plates 54a and trapezoidal plates 54c, which are connected to the lower side of the triangular plate 54 via folds, and are connected to the lower sides of the triangular plates 54 on the isosceles side of the triangular plates 54, respectively. 54a A connecting sticking plate 54 continuously provided on the lower side through folds
b. Further, a lower sticking plate 55 is provided below the side wall plate 35 (sticking plate), which is continuously provided via a fold c.

FIG. 8A is a perspective view of a rectangular tubular sleeve for a liquid paper container in which the sleeve blanks of FIG. 7 are assembled and formed into a rectangular tubular sleeve. The parallel folds a,
The first panel 1 to the fourth panel 4 are bent in the same direction in the same direction through a, a, and a, and the outer end of the first panel 1 and the outer end of the fourth panel 4 are abutted against each other, and One of the first panel 1 and the fourth panel 4 (see FIG. 8).
In (a), the upper surface or the lower surface of the fifth panel 5 (adhesive panel), which is continuously provided at the outer edge of the fourth panel 4, the other panel (FIG. 8).
In (a), the side seal portion 7 is formed by stacking and sticking the outer end portions of the first panel 1).

In FIG. 8 (b), the outer end of the first panel 1 is superposed and adhered to the upper surface (outer surface) of the fifth panel 5 (adhesive panel), which is connected to the outer end of the fourth panel 4. FIG. 8C is a plan view showing the above-mentioned conventional rectangular tubular sleeve in which the side seal portion 7 is formed, and FIG. 8C is a perspective view showing a state in which the conventional rectangular tubular sleeve is folded flat. is there.

In the case of assembling and manufacturing a liquid paper container from the rectangular tubular sleeve having the side seal portion 7 formed,
The flat tubular rectangular sleeve shown in FIG. 8C is erected to make a rectangular parallelepiped shape, and then the top seal portion T of the first panel 2 and the fourth panel 4 shown in FIG. The equilateral triangular plates 42 and 44 (see FIG. 7) are folded at each other through the fold b (the isosceles triangular plate 4 in the case of the gable top type).
2 and 44 are folded inward, and in the case of the flat top type, isosceles triangular plates 42 and 44 are folded outward, so that the upper panel 41 and the upper panel 43 of the first panel 1 and the third panel 3 are folded.
(See FIG. 7) and fold inwardly through folds b (in the case of the gable top type, fold each other into a sloping roof type; in the case of the flat top type, fold into flat), the upper plates 41, 43 ends Part of the joint sticker plates 41a and 43a
(See FIG. 7), and the preheated gastric patch 41a, 43, which is superposed vertically by the attachment.
a, and the folded connecting palm sticker plates 42b, 42b, 44
b, 44b (folded to the inside in the case of the gable-top type, and folded to the outside in the case of the flat-top type) are composed of a pair of pressure block plates that can be pressed and separated from each other from both sides of the overlap. The top seal portion T of the liquid paper container is hermetically sealed by pressure fusion with the formed top seal jaws.

As shown in FIG. 8A, the bottom seal portion B is formed by folding the isosceles triangular plates 52 and 54 of the second panel 4 and the fourth panel 4 inward with each other.
And the bottom plate 53 (see FIG. 7) are flattened and folded, and the lower end portion of the bottom plate 51 preheated and the bottom plate 53 are the same.
Connecting patch plates 52b and 54b which are folded inward at the same time, while being attached to the lower palm part patch plate 53a (see FIG. 7).
(See FIG. 7) and the lower ends of the trapezoidal plates 52c and 54c are overlapped with each other to form a pair of pressure block plates which can be pressed and separated from each other (actually, both inside and outside of the rectangular tubular sleeve) so as to face each other. The bottom seal portion B of the liquid paper container is hermetically sealed by pressure fusion with a bottom seal jaw configured as described above.

[0012]

By the way, FIG. 8 (b)
As shown in the plan view of FIG. 5, the outer ends of the first panel 1 and the fourth panel 4 are abutted against each other, and the fifth panel 5 (which is connected to the outer end of at least one panel (for example, the fourth panel 4)) is connected. (Adhesion panel) Inner surface of each of the side seal portions 7 of the rectangular tubular sleeve formed by overlapping and adhering the upper surface or the lower surface and the outer end portion of the other panel (for example, the first panel 1) with each other ( Alternatively, as the sealant layer, the same resin layer (for example, polyethylene resin) or a resin layer made of a combination of different resins that are easily heat-sealed is laminated on the entire inner surface and outer surface of each of the first panel 1 to the fourth panel 4. Since the inner surfaces are heated in advance, the inner surface resin layers 6 are fused to each other by pressure bonding to each other using side seal jaws for side seals. , Was to form a side seal portion 7.

However, with this alone, when the liquid paper container filled with the liquid contents drops and the container internal pressure increases momentarily, the side seal portion 7
A large internal pressure load is applied to the side seal portion 7, and the sealing strength (adhesive force) of the side seal portion 7 that withstands this load depends only on the heat fusion strength of the inner resin layer. In the case of a weak liquid paper container, the side seal portion 7 is likely to burst, and in particular, the side seal portion 7 is thinly cut (skived) at the outer end portion of the fifth panel 5 to make a fold. In the case of a liquid paper container that is bent parallel to a and formed by sticking and is edge-protected, the location where the object collides with the object is crushed or distorted by dropping, and the impact causes the edge of the side seal portion 7 Peeling was likely to occur from the protected part.

The present invention is a rectangular tubular sleeve for a liquid paper container having a side seal portion that withstands a large internal pressure load applied to the side seal portion of the liquid paper container, and the side seal withstands a sudden load of the internal pressure of the container. To produce a liquid paper container with parts.

[0015]

According to a first aspect the invention of the present invention, FIG.
As shown in FIG. 1 or FIG. 2 , a rectangular first panel 1, a second panel 2, a third panel 3, and a fourth panel 4, which are arranged in order through parallel folds a, a, a, a, respectively. A fifth panel 5, the panels 1, 2, 3, 4 are formed to have the same width,
The fifth panel 5 is formed to be narrower than the panels 1, 2, 3 and 4, and is formed by bending the first panel 1 to the fifth panel 5 in the same direction in the same direction through the crease a to form a rectangular tube. Panel 1
A rectangular tubular sleeve for a liquid paper container, in which the inner surface of the outer end portion or the outer surface thereof and the fifth panel 5 are overlapped with each other and adhered with a heat-fusible inner resin layer to form the side seal portion 7, A reinforcing film 8 for reinforcing the side seal strength of an appropriate width is provided on the outer surface of the sleeve to cover the outer edge of either one of the first panel 1 and the fifth panel 5, which is the outer side of the sleeve of the side seal portion 7. A rectangular tubular sleeve for a liquid paper container, which is adhered to both panel surfaces of the first panel 1 and the fifth panel 5 along the entire length of the side seal portion 7 with an adhesive material.

Next, a second aspect of the present invention is, as shown in FIG. 3, a first panel 1 and a second panel, each of which has a rectangular shape and which are successively connected through parallel folds a, a, a, a. 2 and 3rd panel 3
And a fourth panel 4 and a fifth panel 5, the panels 2, 3, 4 are formed to have the same width, and the first panel 5 and the fifth panel 5 are formed to be narrower than the panels 2, 3, 4. The first panel 1 to the fifth panel 5 are bent in the same direction in the same direction through the folds a into a rectangular tube shape, and the outer ends of the first panel 1 and the fifth panel 5 are overlapped with each other and heat-melted. In a rectangular tubular sleeve for a liquid paper container having a side seal portion 7 formed by adhering with an adhesive inner surface resin layer, the first outer surface of the side seal portion 7 is the sleeve outer surface side.
A reinforcing film 8 for reinforcing the side seal strength of an appropriate width, which covers the outer edge of one of the panel 1 and the fifth panel 5, is provided along the entire length of the side seal portion 7 with the first panel 1 and the fifth panel 5. 5 is a square tubular sleeve for a liquid paper container, which is adhered to both panel surfaces of No. 5 via an adhesive material.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A square tubular sleeve for a liquid paper container according to the first invention of the present invention will be described with reference to one embodiment of FIGS. 1 (a) to 1 (c).

The rectangular tubular sleeve for a liquid paper container in one embodiment of the first invention is as shown in the perspective view of FIG.
The first panel 1, the second panel 2, the third panel 3, the fourth panel 4, and the fifth panel 5 are parallel folds a, a,
a and a are connected in order via a. In addition, in the present invention, the fifth panel 5 may be continuously provided to the outer end of the first panel 1 through a parallel fold a.

Further, as shown in FIG. 1 (a), in the rectangular tubular sleeve for liquid paper container according to one embodiment of the first invention, the first panel 1 to the fifth panel 5 have a side wall portion A, A top seal portion T is continuously provided on the upper side of the side wall portion A via a fold b (perpendicular to the fold a), and a fold b on the lower side of the side wall portion A.
And a bottom seal portion B continuously provided via a fold c parallel to the.

The structure of the side wall portion A, the top seal portion T, and the bottom seal portion B in the first panel 1 to the fifth panel 5 in the embodiment of the first invention is as shown in FIG. Since it is the same as the developed view), detailed description will be omitted in the present specification, and description will be given with reference to FIG. 7.

In the present invention, the length in the direction parallel to the parallel fold a is defined as the panel length (or the panel height), and the length in the direction orthogonal to the parallel fold a is defined as the panel width. Then, the panel lengths of the first panel 1 to the fifth panel 5 are not necessarily linear at the upper and lower edges of the panel as shown in FIG. 7, and the structure of the liquid paper container is changed. As a result of the panel design change, the uneven shape is acceptable, and the length is not particularly limited. Further, the panel widths of the first panel 1 to the fourth panel 4 are set to be the same width, and the panel width of the fifth panel 5 is outside the first panel 1 as shown in FIG. The width may be any width as a sticking panel that can be stuck to form an angular tubular sleeve by overlapping with the end portion, and is narrower than the panel width of the first to fourth panels.

The square tubular sleeve for a liquid paper container of the present invention comprises:
A sheet for liquid paper containers similar to the conventional one is used, and a gas barrier resin layer, a resin layer with a low odor such as odor, a metal foil layer such as aluminum, or a liquid content is used for a base sheet mainly composed of paper such as paperboard. Using a sheet for liquid paper containers in which a treatment layer corresponding to the product is laminated, and a surface layer is laminated with a heat-fusible resin film or a sealant layer formed by resin coating, punching or creasing or if necessary It is formed by applying an adhesive coating process.

A rectangular tubular sleeve for a liquid paper container according to an embodiment of the first invention is a perspective view of FIG. 1 (a) and FIG. 1 (b).
As shown in the plan view of FIG.
, Third panel 3, fourth panel 4, and fifth panel 5
After (folding panel) is bent in the same direction through parallel folds a, a, a, a to form a rectangular tubular body,
The upper surface (outer surface) of the fifth panel 5 (sticking panel), which is continuously provided at the outer end of the first panel 1, is overlapped with the outer end portion of the other fourth panel 4, and the inner resin layer 6 is heat-fused. And the side seal portion 7 is formed.

As shown in FIGS. 1 (a) and 1 (b), the side seal portion 7 of the square tubular sleeve for the liquid paper container.
Is composed of a fifth panel 5 connected to the first panel 1 and an outer end portion of the fourth panel 4, and the side seal portion 7
The tape-like reinforcing film 8 having an appropriate width from the outer surface of the first panel 1 to the outer surface of the fourth panel 4 so as to cover the panel outer edge of the fourth panel 4 on the outer surface side of the sleeve.
However, it is attached via an adhesive.

FIG. 1 (c) shows a flat (flat) rectangular tubular sleeve for a liquid paper container of the first invention to which a reinforcing film 8 is attached.
FIG. 3 is a perspective view showing a state in which the liquid paper container is assembled into a box from a rectangular sleeve for a liquid paper container, the rectangular tubular sleeve for a liquid paper container having a side seal portion 7 being formed. First, it is folded flat and sequentially stacked and accumulated upward, and loaded into a box making / filling machine to fill and supply the box making and liquid contents.

FIG. 2 is a plan view for explaining another embodiment of the rectangular tubular sleeve for a liquid paper container of the first aspect of the present invention, in which the fifth end is formed on the outer end of the fourth panel 4 with a parallel fold a. Panel 5 (sticking panel) is arranged in series, and parallel folds a, a,
After the first panel 1, the second panel 2, the third panel 3, the fourth panel 4, and the fifth panel 5 (adhesive panel) are bent in the same direction via a and a to form a rectangular tubular shape, ,
The outer edge of the fourth panel 4 is superposed on the lower surface (inner surface) of the fifth panel 5 that is connected to the outer end of the first panel 1, and the inner surface of the fourth panel 4 is adhered by heat fusion to form the side seal portion 7.
Are formed.

As shown in FIG. 2, the side seal portion 7 of the rectangular tubular sleeve for a liquid paper container according to another embodiment of the first aspect of the invention has an outer end of the fourth panel 4 constituting the side seal portion 7. Of the portion and the fifth panel 5 (adhesive panel), the width is appropriately extended from the outer surface of the fourth panel 4 to the outer surface of the fifth panel 5 so as to cover the outer edge of the fifth panel 5, which is the outer surface side of the sleeve. The tape-shaped reinforcing film 8 is adhered via an adhesive.

Next, as shown in the plan view of FIG. 3, the rectangular tubular sleeve for a liquid paper container of the second invention has parallel folds a, a,
a first panel 1 each having a rectangular shape and sequentially arranged via a
, Second panel 2, third panel 3, and fourth panel 4
And a fifth panel 5.

The panels 2, 3 and 4 are formed to have the same width, and the first panel 1 and the fifth panel 5 are formed to be narrower than the panels 2, 3 and 4.

In one embodiment of the second invention described above, FIG.
As shown in, the panel width of the first panel 1 and the panel width of the fifth panel 5 are about 1/2 of the panel widths of the other second panel 2, third panel 3 and fourth panel 4. With respect to the width, the outer end of the first panel 1 and the outer end of the fifth panel 5 are overlapped with each other to form another panel 2, 3, 4
After the panel width is set to be the same as the above, the side seal portions 7 are formed by sticking the inner resin layers 6 superposed on each other by heat fusion.
A side seal portion 7 is formed along the center of the panel width of the composite panel 10 in combination with the panel 5.

As shown in FIG. 3, the side seal portion 7 formed along the central portion in the panel width direction of the first panel 1 and the fifth panel 5 has an outer end portion of the first panel 1 and a fifth end portion.
The first outer surface of the first panel 1 is covered with the outer edge of the panel 5 so as to cover the outer edge of the first panel 1 of the first panel 1 on the outer surface side of the sleeve which constitutes the side seal portion 7. A tape-shaped reinforcing film 8 having an appropriate width is attached to the outer surface of the panel 5 via an adhesive.

The panel width of the first panel 1 and the fifth panel 5 are set so that the panel width of the composite panel 10 becomes equal to the panel widths of the other second panel 2, third panel 3 and fourth panel 4. The panel width of the first panel 1 can be set as appropriate.
Corresponding to the panel width of the fifth panel 5, the position of the side seal portion 7 is set to the central portion of the panel width of the composite panel 10 and the second
It can be set at an appropriate position between the corner of the panel 2 side or the corner of the fourth panel 4 side.

FIG. 4 shows another embodiment of the rectangular tubular sleeve S for liquid paper containers of the first invention or the second invention of the present invention, in which the first panel 1 and the fifth panel 5 are overlapped. It is a partial expanded perspective view which shows the state which stuck the tape-shaped reinforcement film 8 to the side seal part 7 formed by pasting together.

According to FIG. 4, the rectangular tubular sleeve S for a liquid paper container has polyethylene resin, polyester resin, ethylene-vinyl acetate resin, polyethylene-polyester blend on both front and back surfaces of a paper base sheet p. Heat-fusible synthetic resin layers p ₁ and p ₂ (synthetic resin film or synthetic resin coating film) made of resin or the like are laminated and formed. The synthetic resin layers p ₁ and p ₂ are the same resin or different resins that are heat-meltable to each other.

A fold line d is formed on the outer end of the fifth panel 5.
The folding panel 5a for edge protection is continuously provided through the folding panel 5a, and the inner surface side of the outer end portion of the fifth panel 5 is thinly cut (skived) to a thickness of about half to form the folding panel 5a. Is attached to the first panel 5 and the fifth panel 5 by folding back to the inner surface of the fifth panel 5 through the fold d.
Are adhered to each other by the same synthetic resin layer p ₁ on the outer surface side of the panel.

The reinforcing film 8 in the first invention or the second invention is made of a synthetic resin film which can be adhered to the outer surface of the rectangular tubular sleeve S for a liquid paper container as a material. If the outer surface resin of the sleeve S is polyethylene, a synthetic resin film that can be heat-sealed thereto is, for example, a polyolefin resin single film such as polyethylene or a copolymer resin single film such as ethylene-vinyl acetate, or the above polyolefin resin. Alternatively, a laminated film having the above-mentioned copolymer resin as a sealant layer can be used, and a polyester resin (polyethylene terephthalate), nylon, etc. can be used for the laminated film. The thickness is not particularly limited, but is, for example, 300 μm or less and 50 μm or less.
m to 100 μm, or 100 μm to 200 μm
The degree is appropriate.

FIG. 5 is a schematic side view showing an example of a process for manufacturing the rectangular tubular sleeve S for liquid paper containers of the first invention or the second invention of the present invention, in which the sleeve blanks of FIG. 7 are side-sealed. The rectangular tubular sleeve S ₁ for a liquid paper container as shown in FIG. 8 (c) obtained by doing so is continuously wound at a predetermined interval by the sleeve feeding / conveying means 15 and is wound in a roll. Tape-shaped reinforcing film 8
(For example, width is about 10 mm to 30 mm, or 15 mm to 2
0 mm) and unwind the film 8 into a sleeve S
_The film 8 is superposed on the side seal portion 7 of _{No. 1} and is introduced between the rotating heating / pressurizing rolls 16a and 16b to be stuck, and the film 8 is sequentially cut by the cutter 17.

Alternatively, as shown in FIG. 6, a rectangular tubular sleeve S ₁ for liquid paper container as shown in FIG. 8C obtained by side-sealing the sleeve blanks of FIG.
While sequentially supplying the same at predetermined intervals by the sleeve supply / conveying means 15, the long tape-shaped reinforcing film 8 (for example, about 10 mm to 30 mm in width, or about 15 mm to 20 mm) wound in a roll is unwound, Film 8
_On the side seal portion 7 of the sleeve S ₁ ,
Heating / pressurizing plate that moves up and down sequentially (heat sealer, etc.)
The film 8 is introduced between the plate 18a and the surface plate 18b and adhered thereto, and the film 8 is sequentially cut by the cutter 17.

The step of side-sealing sleeve blanks as shown in FIG. 7 to form the side-seal portion 7 and the step of attaching the reinforcing film 8 on the side-seal portion 7 may be carried out in-line. However, it may be carried out in a separate step off-line.

[0040]

The rectangular tubular sleeve for a liquid paper container according to the present invention is reinforced with an appropriate width on the outer surface of the sleeve along the outer edge of the first panel 1 or the fifth panel 5, which is the outer surface of the side seal portion 7. Since the film 8 is attached, the sealing strength of the side seal portion 7 is obtained by heating and fusing the inner surface of the overlapping region of the first panel 1 and the fifth panel 5 to each other. Between the reinforcing film and the sleeve obtained by heating and fusing the inner surface of the overlapping area between the outer surface of the sleeve and the reinforcing film from above the side seal portion 7 with the adhesive force (cohesive force of the inner surface fusion layer). The side seal strength is obtained by adding both the adhesive force due to the adhesive force of (the cohesive force of the inner surface fusion layer).

[0041]

INDUSTRIAL APPLICABILITY The rectangular tubular sleeve for a liquid paper container of the present invention does not depend on the side seal strength only on the adhesive strength on the inner surface of the first panel and the fifth panel which are superposed on each other, but by the reinforcing film. It is reinforced, even if the liquid paper container after filling and packaging the contents falls, the container internal pressure increases momentarily, and even if a large internal pressure load due to the weight of the contents is applied to the side seal part. , A side seal strength that sufficiently withstands this load is obtained, and even when the container is crushed or distorted due to an object collision due to a drop, the reinforcing film attached causes the container to rupture and break from the side seal portion. An effect that can prevent the scattering of the contents and can manufacture a liquid paper container with a side seal part that withstands sudden fluctuations in container pressure and distortion due to collision, etc. A.

[Brief description of drawings]

FIG. 1 (a) is an external perspective view of a rectangular tubular sleeve for liquid paper containers according to an embodiment of the first invention, and FIG.
FIG. 3 is a plan view of a rectangular tubular sleeve for a liquid paper container according to an embodiment of the invention, and (c) is a perspective view showing a state in which the rectangular tubular sleeve for a liquid paper container according to an embodiment of the first invention is flatly folded. is there.

FIG. 2 is a plan view of a rectangular sleeve for a liquid paper container according to another embodiment of the first invention.

FIG. 3 is a plan view of a rectangular sleeve for a liquid paper container in an embodiment of the second invention.

FIG. 4 is a partially enlarged perspective view of a rectangular tubular sleeve for a liquid paper container in the first invention or the second invention.

FIG. 5 is a schematic side view illustrating an example of a step of adhering the reinforcing film of the rectangular tubular sleeve for a liquid paper container in the first invention or the second invention.

FIG. 6 is a schematic side view illustrating another example of the step of attaching the reinforcing film of the rectangular tubular sleeve for a liquid paper container in the first invention or the second invention.

FIG. 7 is a plan view illustrating a general sleeve blank.

8A is an external perspective view of a conventional rectangular tubular sleeve for a liquid paper container, FIG. 8B is a plan view of a conventional rectangular tubular sleeve for a liquid paper container, and FIG. FIG. 3 is a perspective view of the square tubular sleeve for a liquid paper container of FIG.

[Explanation of symbols]

1 ... 1st panel 2 ... 2nd panel 3 ... 3rd panel 4
... fourth panel 5 ... fifth panel 5a ... folded panel 6 ... inner surface resin layer
7 ... Side seal part 8 ... Reinforcement film 10 ... Synthetic panel 15 ... Sleeve supply / conveyance means 16a, 16b ... Heating / pressurizing roll 17 ... Cutter 1
8a ... heating plate 18b ... plate A ... side wall portion T ... top seal portion B ... bottom seal portion a ... parallel crease b ... crease c ... crease d ... crease S ... sleeve S ₁ ... sleeve p ... Paper Base material sheet
p _1, p ₂ ... Synthetic resin layer

Claims (2)

(57) [Claims] 1. A first panel 1, a second panel 2, a third panel 3, a fourth panel 4 and a fifth panel 5 each having a rectangular shape and arranged in series through parallel folds a, a, a, a. And the panels 1, 2, 3, 4 are formed to have the same width, and the fifth panel 5
Is formed to be narrower than the panels 1, 2, 3 and 4, and each of the first panel 1 to the fifth panel 5 is bent into a rectangular tube shape in the same direction through a fold a to form an outer end of the first panel 1. part inner surface
Alternatively, the outer surface and the fifth panel 5 are overlapped with each other, and a square tube sleeve for a liquid paper container in which a side seal portion 7 is formed by adhering with a heat-fusible inner surface resin layer is formed on the outer surface of the sleeve. The side seal portion 7 has a reinforcing film 8 for reinforcing the side seal strength of an appropriate width, which covers the outer edge of one of the first panel 5 and the fifth panel 5, which is the outer side of the sleeve of the side seal portion 7. A rectangular tubular sleeve for a liquid paper container, which is adhered to both panel surfaces of the first panel 1 and the fifth panel 5 along the entire length thereof by means of an adhesive. 2. A rectangular first panel 1, a second panel 2, a third panel 3, a fourth panel 4, and a fifth panel 5 which are successively arranged through parallel folds a, a, a, a. And the panels 2, 3 and 4 are formed to have the same width, and the first panel 1 and the fifth panel 5 are formed to be narrower than the panels 2, 3 and 4, respectively. The panels 5 are each bent in the same direction into a rectangular tube shape through the folds a, the outer ends of the first panel 1 and the fifth panel 5 are overlapped with each other, and they are attached by a heat-fusible inner resin layer. In the rectangular tubular sleeve for a liquid paper container having the side seal portion 7 formed therein, one of the first panel 1 and the fifth panel 5, which is the sleeve outer surface side of the side seal portion 7, is provided on the outer surface of the sleeve. Reinforcement film 8 for reinforcing the side seal strength of an appropriate width for covering the outer edge of the The first panel 1 and the liquid feed container square tubular sleeve, characterized in that through the bonding material is adhered to both the panel surface of the fifth panel 5 along the entire length of the side seal portion 7.