JPH09207935A - Easily laterally unsealing paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laterally unsealing paper container without use of scissors, a cutter, etc. SOLUTION: An unsealing flap 15 made of a resin film is put between an upper flap 13 and a lower flap 14 of the superposing area 12 of a laterally unsealing paper container 10 made of a container raw material 11 provided with thermoplastic resin layers at both front and rear face sides of a paper base material, leaving a picking length and stuck thereto. And notches 19 are cut in the upper flap 13 of the superposing area 12 to correspond to both ends of the vertical width direction of the unsealing flap 15. And further, an extensible polyolefin film having a larger extensibility in one direction than that in the right-angled crossing direction, is laminated at the inside of the raw material 11 of the container, so that the direction of the larger extensibility coincides with the unsealing direction of the container 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container for storing a liquid such as juice or a gel-like food such as tofu or jelly, and more particularly to a paper container having an easy horizontal opening property.

[0002]

2. Description of the Related Art Paper containers are relatively easy to treat after use and can be stored at room temperature for a long period of time.
It is widely used to store liquids such as sake and gel foods such as tofu and jelly. As a conventional means for opening such a paper container, as disclosed in Japanese Patent Application Laid-Open No. 55-154240, cut lines 3 are displayed at the corners of the upper horizontal seal portion 2 of the paper container 1 (FIG. 17). By pulling up the corner of the horizontal seal portion 2 and cutting it along the perforation line 3, a type in which the spout 4 and the air passage 5 are opened as shown in FIG. 18, or the paper container 1 as shown in FIG. There is known a type in which a spout 6 is provided in advance on the top wall of the above and a pull tab tape 7 is pasted on the spout.

[0003]

However, with such an opening structure, when taking out gel-like food such as jelly or tofu, it is impossible to take out without destroying the shape of the contents, and therefore, scissors or a cutter. There is a problem that it takes a lot of time and labor to open the package by using the above.

An object of the present invention is to provide a lateral opening type paper container which can be laterally opened without using scissors or a cutter.

[0005]

A horizontally openable paper container according to the present invention is made of a material having a thermoplastic resin layer on both front and back sides of a paper base material, and is composed of an upper piece and a lower piece of an overlap portion to be laminated. An unsealing piece made of a resin film is sandwiched and adhered with a pinching length left between and, and a notch is provided in the upper piece of the overlapping portion corresponding to both ends in the width direction of the unsealing piece, and On the inner surface side of the container material, a stretched polyolefin film having a property that one of the draw ratios is larger than the draw ratio in the direction orthogonal thereto, so that the direction in which the draw ratio is large coincides with the unsealing direction of the container. It is characterized by being laminated.

With such a structure, when the opening piece is picked up and pulled in the lateral direction, the notch provided in the upper piece of the overlapping portion guides the cutting of the paper container in the same direction, and moreover, the container. The stretched polyolefin film laminated on the inner surface is easily torn in the same direction at the width of the unsealed piece starting from the notch, so that the paper container also breaks halfway at the width of the unsealed piece starting from the notch. It is easily cut into strips and separated into upper and lower parts, and by removing the separated upper part, the lower paper container part is
It is in a laterally opened state in which the upper part is entirely opened. Further, since the unsealing piece is made of a resin film, the unsealing piece is easily deformed, and the unsealing piece may be caught even when the container material passes through a roller or the like in a process such as filling and molding of a paper container. It is possible to avoid the occurrence of trouble.
Therefore, the paper container according to the present invention has no problem even in aseptic packaging that needs to automatically perform a series of steps such as filling the paper container and molding the filled paper container in a sterile chamber or the like. Can be used. In addition, aseptic packaging here means that the contents and packaging materials that have been made aseptic in advance are packaged under aseptic conditions, and the aseptic type paper container is a paper container suitable for use in this aseptic packaging. I mean.

Further, it is preferable that a sealing tape is adhered to the back surface side of the overlapping portion to be laminated and attached so as to straddle the upper piece and the lower piece. With such a structure, the integrity of the seal at the overlap portion can be achieved.

Further, it is preferable that the unsealing piece is sandwiched and adhered so that the base end of the unsealing piece projects outward from the end portion of the lower piece. With such a structure,
The adhesive strength between the upper piece and the sealing tape is weakened, and when the unsealing piece is picked and pulled, the cut-out portion of the upper piece in the overlapping portion with the sealing tape is easily cut, thereby easily opening the paper container. be able to.

Further, it is preferable that the front surface side of the unsealing piece is bonded to the container material with a stronger bonding strength than the back surface side. With such a structure, when pulling the opening piece to start opening, the layer on the back side of the opening piece is easily peeled from the container material, and the layer on the front side is strongly adhered to the container material. Since there is no risk of peeling, the paper container can be easily and reliably opened laterally by pulling the opening piece.

Further, it is preferable that the unsealing piece is formed of a laminate of two or more layers.

Further, the container material has two parallel halves extending from the outer surface to the paper material on the outer surface of the container material so as to encircle the container body in the lateral direction so as to correspond to both ends in the width direction of the unsealing piece. A cut is preferably provided. With such a structure, when the unsealing piece is pulled in the lateral direction, the two half-cut portions of the paper container are cut, and the portion between the two half-cuts is stripped without breaking in the middle. It will be cut into pieces, and more reliable opening is possible.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show an example of an embodiment of the present invention. Paper container 10 of this example
Is a container material 11 in which low-density polyethylene films are laminated on the front and back surfaces of a paper material, and both end portions are overlapped and vertically sealed by heat welding to form a tubular shape, and the upper and lower portions thereof are horizontally sealed by heat welding. It has been configured.

In the above structure, the overlapping material portion 12 of the paper container 10 overlaps the container material 11 at the time of vertical sealing.
An unsealing piece 15 made of a resin film is sandwiched between the upper piece 13 and the lower piece 14 constituted by both side end portions of the base material so that the distal end portion of the knob portion 16 projects laterally. It is glued in the open state. This opening piece 15
Are bonded to the upper piece 13 and the lower piece 14 by heat welding.

In this example, the base end of the unsealing piece 15 does not sandwich the entire width of the overlapping portion 12 and is positioned inside the end portion of the lower piece 14 as shown in FIGS. 3 and 4. The seal portion 17 in which the unsealing piece 15 does not intervene is left in the overlap portion 12. Further, the overlapping portion 12
A sealing tape 18 is adhered to the back side of the sheet for the purpose of further improving the integrity of the seal.

Further, the upper piece 13 of the overlapping portion 12 is provided with two notches 19 corresponding to both ends in the width direction of the unsealing piece 15. The positions where the cuts 19 are provided are preferably aligned with both ends of the opening piece 15 in the width direction, but they are not necessarily aligned with each other and may be slightly displaced.

Further, the container material 11 of the paper container 10 includes
On the inner surface side, a stretched polyolefin film 24 having a characteristic that one stretch ratio is larger than the stretch ratio in the direction orthogonal to the stretched polyolefin film 24, and the direction in which the stretch ratio is large is the container 10
Are laminated so as to match the unsealing direction. The stretched polyolefin film 24 includes a stretched polyethylene film and a stretched polypropylene film, but in this example, a stretched polyethylene film is used.

With this structure, the picking portion 16 of the unsealing piece 15
When is pulled and pulled in the horizontal direction, the notch 19 provided in the upper piece 13 of the overlapping portion 12 guides the paper container 10 to be cut in the same direction, and the stretched polyolefin film 24 laminated on the inner surface of the container is Since the notch 19 serves as a starting point and is easily torn in the same direction as the width of the unsealing piece 15, the paper container 10 is also cut from the notch 19 as the starting point and substantially separated by the width of the unsealing piece (see FIG. 5). ). By removing the separated upper portion, the lower paper container portion is brought into a laterally opened state in which the upper portion is entirely opened. Further, since the unsealing piece 15 is made of a resin film, the unsealing piece 15 is easily deformed, and the unsealing piece 15 may be caught even when the container material 11 passes through a roller or the like in a process such as filling and molding. It is possible to avoid the occurrence of trouble.

FIGS. 6 to 8 and FIGS. 9 and 10 show another embodiment of the present invention. All of the upper piece 13 and the lower piece 14 of the overlap portion 12 of the paper container 10 are shown. The unsealing piece 15 adhered in a state of being sandwiched therebetween is sandwiched and adhered so that the base end thereof projects outward from the end portion of the lower piece 14.

In the example shown in FIGS. 6 to 8, the opening is facilitated while maintaining the sealing property. The base end of the opening piece 15 projects outward from the end of the lower piece 14 and the sealing tape 18 is formed. It is sandwiched and adhered to the upper piece 13 so as to be located inside the end of the sealing tape 18. Between the sealing tape 18 and the upper piece 13, there is left a seal portion 31 in which the unsealing piece 15 does not intervene. With the width A of the sealing portion 31, the sealing tape 1
8 and the overlapping width B of the upper piece 13 and the shape of the base of the unsealing piece 15 are not uniform, but about 20 to 70% of the overlapping width B of the sealing tape 18 and the upper piece 13 is left. It is preferable (FIG. 8).

Due to such a structure, the upper piece 1 is formed by the unsealing piece 15 interposed between the upper piece 13 and the sealing tape 18.
The adhesive force between the sealing tape 18 and the sealing tape 18 is weakened, and when the opening piece 15 is pulled and pulled, the sealing tape 18
The cut-out portion of the upper piece 13 in the overlapping portion with and can be easily cut with a light force, whereby the paper container 10 can be easily opened.

Further, in the examples shown in FIGS. 9 and 10, although the sealing property is slightly lower than that of the examples shown in FIGS. 6 to 8, the unsealing piece 1 makes the unsealing easier.
The base end of 5 projects from the end of the lower piece 14 and is sandwiched and bonded so as to project further outward than the end of the sealing tape 18.

From this structure, the upper piece 1 is formed by the unsealing piece 15 interposed between the upper piece 13 and the sealing tape 18.
The adhesive force between 3 and the sealing tape 18 is further weakened,
When the unsealing piece 15 is picked and pulled, the cut-out portion of the upper piece 13 at the overlapping portion with the sealing tape 18 can be easily cut with a lighter force.

FIG. 11 shows another embodiment of the present invention, in which the unsealing piece 15 is formed of a laminate of a plurality of layers, and the layer on the front surface side of the unsealing piece 15 is the layer on the back surface side. It is adhered to the container material 11 with stronger adhesive strength. In this example, a polyethylene layer 22 is laminated on the surface side of a polyester layer 20 which is a kind of airtight resin with an anchor coat 21 which is an adhesive agent, to form a two-layer structure.

The unsealing piece 15 having such a structure is sandwiched between the upper piece 13 and the lower piece 14 which are constituted by the both side ends of the container material 11 which are overlapped with each other at the time of vertical sealing, and the unsealing piece 15 is joined to the upper piece 13 by heat welding. When bonded to the lower piece 14, the unsealed piece 15
Although the polyethylene layer 22 constituting the front side of the upper piece 13 can firmly adhere to the low density polyethylene film laminated on the back side of the upper piece 13, the polyester layer 20 constituting the back side of the unsealing piece 15 is The affinity with the low-density polyethylene film laminated on the surface is poor, and strong adhesion cannot be obtained.

With this structure, when the opening piece 15 is pulled to start opening, the polyester layer 20 on the back side of the opening piece 15 is easily peeled from the container material 11, and the polyethylene layer 22 on the front side is formed on the container material 11. Since there is no possibility that it will be strongly adhered to and peeled off, the lateral opening of the paper container 10 by pulling the opening piece 15 can be performed easily and reliably.

FIG. 12 shows another example of the unsealing piece 15, which has a three-layer structure in which a polyethylene layer 22, a polyester layer 20, and a polyethylene layer 22 are laminated in this order from the surface side. An anchor coat 21 is interposed between the polyethylene layer 22 and the polyester layer 20.

With this construction, since the front surface side and the rear surface side of the unsealing piece 15 are made of the same material, curling does not occur and the unsealing piece 15 can be easily handled in the assembling work of the paper container.

FIG. 13 shows another embodiment of the present invention. The container material 11 of the paper container 10 in the embodiment shown in FIGS. 1, 6 and 9 has the outer surface side thereof, Corresponding to both ends of the opening piece 15 in the width direction, two parallel half cuts 23 extending from the outer surface to the paper material are provided so as to make one round in the lateral direction of the container body. It is preferable that the two parallel half cuts 23 are provided on a lateral extension line from the cut 19 provided in the upper piece 13 of the overlapping portion 12. Although not shown, the two half cuts 23 may be provided in a perforated shape.

With such a structure, when the unsealing piece 15 is pulled in the lateral direction, the two half cuts 23 of the paper container 10 are cut, and the portion between the two half cuts 23 is broken on the way. It will be cut into strips without any need for more reliable opening. FIG. 14 shows an example of the laminated constitution of the container material 11 used for the paper container 10 of the present invention, in which the low density polyethylene film 26 is laminated on the surface of the paper material 25, and the back side of the paper material 25 ( An aluminum foil 28 is laminated on the liquid contact surface side) via an adhesive 27,
A stretched polyolefin film 24 having a characteristic that one stretch ratio is greater than the stretch ratio in the direction orthogonal to the aluminum foil 28 is laminated on the aluminum foil 28 via an adhesive 29, and the low density polyethylene is further formed on the stretched polyolefin film 24. It has a layered structure in which the films 30 are laminated.
The stretched polyolefin film 24 is laminated such that the direction in which the stretch ratio is large coincides with the opening direction (transverse direction) of the paper container 10.

The easily openable paper container according to the present invention is a brick obtained by longitudinally sealing a long roll-shaped container material in the direction of flow to form a tubular shape, and then bag-filling it by repeating horizontal sealing and cutting appropriately. -Type paper container (Fig. 1) and a carton blank that was cut out from the container material in a predetermined shape beforehand were assembled, and after vertical sealing was performed, the bottom horizontal seal, the filling of the contents, and the top horizontal seal were obtained repeatedly. It can be applied to a flat top type paper container (FIG. 15), a gable type paper container (FIG. 16), and the like.

[0031]

According to the easy horizontal opening type paper container according to the present invention, the opening piece which is sandwiched and adhered to the overlap portion of the paper container is picked and simply pulled in the lateral direction, that is, in the circumferential direction of the body part of the paper container. In this way, the body part of the paper container is cut in the same direction with the width of the unsealing piece and separated up and down, and the paper container is laterally opened by this, so the lateral opening of the paper container can be easily performed by a simple operation. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a lateral opening type paper container according to the present invention.

FIG. 2 is a side view of a main part of the easy-open opening type paper container shown in FIG.

FIG. 3 is a cross-sectional view of essential parts of the easy-open opening-type paper container shown in FIG.

FIG. 4 is an explanatory view of a main part of the easy horizontal opening type paper container shown in FIG.

FIG. 5 is an explanatory view showing a state in which the easy horizontal opening type paper container shown in FIG. 1 is opened.

FIG. 6 is a side view of essential parts showing another example of the embodiment of the easy-open opening type paper container according to the present invention.

FIG. 7 is a cross-sectional view of a main part of the easy-open opening-type paper container shown in FIG.

FIG. 8 is an explanatory view of the main parts of the easy-open opening-type paper container shown in FIG.

FIG. 9 is a side view of essential parts showing another example of the embodiment of the easy-open opening type paper container according to the present invention.

FIG. 10 is a lateral cross-sectional view of a main part of the easy-open opening-type paper container shown in FIG. 9.

FIG. 11 is a cross-sectional view of the essential parts showing another example of the embodiment of the easy-open opening type paper container according to the present invention.

FIG. 12 is a cross-sectional view of essential parts showing another example of the embodiment of the easy-open opening type paper container according to the present invention.

FIG. 13 is a perspective view showing another example of the embodiment of the easily laterally opening type paper container according to the present invention.

FIG. 14 is a cross-sectional view of an essential part showing an example of a laminated structure of a container material used in the easy-open opening type paper container according to the present invention.

FIG. 15 is a perspective view showing another example of the embodiment of the easy-open opening type paper container according to the present invention.

FIG. 16 is a perspective view showing another example of the embodiment of the easy-open opening type paper container according to the present invention.

FIG. 17 is a perspective view of a conventional paper container.

FIG. 18 is a perspective view showing an opened state of the paper container shown in FIG.

FIG. 19 is a perspective view showing another example of a conventional paper container.

[Explanation of symbols]

 10 Paper Container 11 Container Material 12 Overlap Part 13 Upper Piece 14 Lower Piece 15 Opening Piece 16 Picking Part 17 Sealing Part 18 Sealing Tape 19 Notch 20 Polyester Layer 21 Anchor Coat 22 Polyethylene Layer 23 Half Cut 24 Stretched Polyolefin Film 25 Paper Material 26 Low density polyethylene film 27 Adhesive 28 Aluminum foil 29 Adhesive 30 Low density polyethylene film 31 Seal part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Sase 5-21-2 Oji, Kita-ku, Tokyo NIPPON PAPER CO., LTD. Liquid Packaging Center

Claims (7)

[Claims] 1. A container made of a material having a thermoplastic resin layer on both front and back sides of a paper base material, which is an unsealing piece made of a resin film between an upper piece and a lower piece of an overlapping margin part to be laminated and laminated. Is sandwiched and adhered while leaving a picked length, and a notch is provided in the upper piece of the overlapping portion corresponding to both ends in the width direction of the opening piece, and the container material has an inner surface side. A stretched polyolefin film having a property that one of the draw ratios is greater than the draw ratio in the direction orthogonal to the stretched polyolefin film is laminated so that the direction in which the draw ratio is large coincides with the unsealing direction of the container. Horizontal open type paper container. 2. The easy-open opening-type paper container according to claim 1, wherein a sealing tape is adhered to the back surface side of the overlapping portion to be overlapped so as to straddle the upper piece and the lower piece. . 3. The easy-open opening-type paper container according to claim 2, wherein the opening piece is sandwiched and adhered so that a base end of the opening piece projects outward from an end portion of the lower piece. 4. The easy-open opening type paper container according to claim 1, 2 or 3, wherein the front surface side of the unsealing piece is adhered to the container material with a stronger adhesive strength than the rear surface side. 5. The easy-open opening-type paper container according to claim 1, 2, 3 or 4, wherein the unsealing piece is composed of a laminated body of two or more layers. 6. The container material has two parallel halves extending from the outer surface to the paper material on the outer surface of the container material so as to make one round in the lateral direction of the container body corresponding to both ends of the opening piece in the width direction. A cut is provided, Claim 1, 2,
The easily openable paper container according to 3, 4, or 5. 7. The container is an aseptic type paper container, and the container is a paper container of an aseptic type.
Or the easy-open opening type paper container according to item 6.