JP2003034340A - Paper container with spout - Google Patents

Abstract

(57) [Problem] To provide a standing pouch in which paper around a spout bonding portion is not broken when the spout is mounted on a paper standing pouch by a heat sealing method. SOLUTION: The container is mainly composed of clupak paper or crepe paper having an elongation ratio of 4 to 10% according to JIS P8113, and a spout is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for filling and packaging a liquid material, a powdery material, or the like, and more particularly to a paper container with a spout in which a paper material forming the main body of the container is composed of stretched paper.

[0002]

2. Description of the Related Art Conventionally, as a packaging container for products such as liquid, powder or viscous paste foods / seasonings, detergents / softeners, etc., which are used up or refilled, self-supporting sachets or so-called Pillow style pouches are used. Self-supporting self-supporting bags (also called "standing pouches") are soft packaging materials for improving the filling effect of contents and exhibiting effects at the time of sale, and for making them stable and self-supporting on the table during use. (Usually, a resin film is used), the bottom part is folded and sealed into, for example, a W shape, and when the contents are filled, the front and rear sides of the bottom part expand into an arc shape, and the shape expands in the thickness direction. The device is designed to exert its self-sustaining function.

In recent years, the contents can be poured out by opening without using scissors, knives, etc., and should be resealable. In the case of beverage use, it is not necessary to insert a straw so that it can be used for drinking. Therefore, a pouch with a spout has been proposed in which a dedicated molding spout called a spout is attached to a bag to enhance user convenience.
This bag product is used in packaging such as seasonings such as sauces and sports drinks.

However, in the self-supporting flexible packaging bag, most of the materials used for its base material are synthetic resin composite films, and the contents are undefined like liquids or powders. When external force is applied, it may bend and lose its shape, or in some cases lose its independence. This tendency is particularly large in the case of a soft packaging bag in which the content is filled in a large amount. In addition, it has been pointed out that the soft packaging bag made of a synthetic resin composite film may damage the incinerator due to the high calorie heat generated during incineration. It has also been proposed to form a bag using not only a resin film but also a material using paper as a material used for the base material. For example, JP-A-56-142051, JP-A-59-187
548 and JP-A-62-168859 disclose the use of paper as a part of the base material.

[0005]

However, a special molding casting is applied to the upper part of a bag formed from a paper-based base material (base material in which a thermoplastic resin film is laminated on one or both sides of a paper layer = laminated paper). When attaching the outlet (spout) by adhesion (by the heat seal method) by heat melting,
As shown in FIG.
The spout 6 is sandwiched between b), and a pair of pressure-type seal heads 7a, 7 are attached to the laminated paper from both sides.
By pressing b, the laminated paper is deformed under pressure into a shape corresponding to the outer peripheral shape of the spout, the laminated paper and the outer peripheral surface of the spout are melt-bonded to each other via a thermoplastic resin, and liquid is leaked from the seal. Try not to. However, the base materials 5a and 5b of the bag mainly made of paper are forcibly deformed from the flat state by the seal head so as to come into close contact with the outer peripheral shape of the spout 6. When the base material is deformed, a large tensile force is generated in the deformed portion. Since the resin film has a large elongation, it easily fits well to the outer peripheral shape of the spout, but the paper has a small elongation and therefore the tensile force accompanying the deformation (in Fig. 5, the tensile force applied to the paper is indicated by arrows a and b). ) Has the drawback that it can not be tolerated and will be torn. When the paper breaks, there is a problem that not only the appearance of the container is impaired, but also the sealing strength at the spout joint is lowered, and liquid leakage easily occurs from the broken part.

In view of the problems of the prior art as described above, the main object of the present invention is to use a material mainly composed of paper as a standing pouch, and to heat the spout on the paper-made standing pouch by heat melting (heat The purpose of the present invention is to provide a standing pouch in which the paper around the spout adhesive portion does not break when mounted (by the sealing method).

[0007]

Means for Solving the Problems The inventors of the present invention have conducted a study to attach a spout to a standing pouch-shaped container formed of a paper-based material by a heat-sealing method, and as a result, the material of the container has been found. The present invention has been achieved by finding that a standing pouch that does not cause breakage in the spout mounting portion can be manufactured by forming the above-mentioned material from a material mainly composed of a stretched paper having particularly good elongation. The solving means adopted by the present invention to solve the above problems is as follows.

According to the first aspect of the present invention, a laminated paper in which a thermoplastic resin layer is provided on at least one surface of a paper layer is used, and the thermoplastic resin layer is formed as an inner surface layer of the container. In the container, a peripheral edge portion of the container is heat-sealed with a laminated paper facing the thermoplastic resin layer, and a spout formed by another member faces the sealing portion. It is characterized in that it is sandwiched between facing surfaces of a laminated paper and is fixed by adhering by heat fusion, and the paper layer forming the main body of the container is made of stretched paper. The term “stretched paper” in the present invention means a paper having a breaking elongation larger than that of ordinary paper.

According to a second aspect of the present invention, in the invention according to the first aspect, the elongation at break defined by JIS P8113 of the stretched paper in a direction in which a tensile force is applied when the spout is heat-sealed, It is characterized by being 4% to 10%.

A third aspect of the present invention is characterized in that, in the first or second aspect of the invention, the stretched paper is Kurupack paper or crepe paper.

The invention described in claim 4 is the same as claim 1.
In the invention described in any one of 3 to 3, the longitudinal direction of the stretched paper (the flow direction of the paper at the time of manufacture) is a direction in which a tensile force is applied when the spout is heat-sealed. Furthermore, the invention of claim 5 is the bag container according to any one of claims 1 to 4, wherein the container is provided with self-supporting property, and the linear seal part of the container top is separately provided. It is characterized in that the prepared molding injection port made of synthetic resin is adhered and attached by heat fusion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a paper container according to the present invention will be described below. In the paper container of the present invention, the container main body is composed of a material whose main body is paper whose both sides or one side is laminated with a thermoplastic resin. Specifically, as described later, the paper layer constituent part is made of paper having elongation performance of 4 to 10% in breaking elongation in a direction in which a large tension is applied during processing. It is preferable to use paper which is made from kraft pulp as a main component, as the paper to which the elongation performance is used in the present invention. In addition, in the drying process on the paper machine, this paper is made by passing wet paper between the dryer roll and the belt and shrinking it by utilizing the shrinkage of the belt that has been stretched in advance, so-called Clupak paper, press roll Alternatively, it is preferably a so-called crepe paper that is wrinkled on a Yankee dryer using a doctor. That is, examples of this type of paper include bleached kraft paper or crepe-processed bleached kraft paper and unbleached kraft paper. The basis weight of the paper is not particularly limited, but is 30 to 200 g /
It is appropriately selected within the range of m ² . When the basis weight is smaller than the above range, the strength and rigidity of the container are deteriorated, and when the basis weight is larger, it is not preferable in terms of workability. The elongation of the paper is such that the breaking elongation (according to JIS P8113) in the direction in which the spout is pulled and expanded when it is heat-sealed and attached (using JIS P8113) is in the range of 4% to 10%, the shape of the spout, etc. Select according to. A more preferable range of elongation at break is 5 to 10%. If the breaking elongation is less than 4%, the paper layer portion is easily broken when the spout is attached, and conversely, if it exceeds 10%, it is not preferable in terms of shape retention as a container.

The material used for the main body of the paper container of the present invention is heat-sealable in which at least one surface of the paper layer is laminated with one or more resins selected from thermoplastic resins such as polyester, nylon, polypropylene and polyethylene. A simple laminated paper 5 is used. Using this laminated paper as a material that constitutes the main body of the container, at least
The container of the present invention is formed by arranging the thermoplastic resin layer of the material so as to be on the inner surface of the body of the container and forming it into a bag shape.

A container 1 shown in FIG. 1 shows an embodiment of the present invention, in which two sheets of material 5 constituting the body portion made of the laminated paper are stacked so as to face each other, and the bottom portion is folded into a substantially W shape to form a peripheral edge. Is a standing pouch-shaped container obtained by heat-sealing. The container 1 includes left and right side seal portions 2 and 3 and an upper seal portion 4 that is sealed after filling the contents. After filling the contents, the bottom part of the container expands in a circular arc shape at both front and rear sides, and becomes a shape spreading in the thickness direction to exert a self-supporting function.

The shape of the container 1 is not limited to that having the left and right side seal portions 2 and 3 as described above, and may have a rounded tubular appearance with no folds in the body ( See FIG. 2). Further, the bottom of the container is not limited to the one that is folded and sealed in a W shape, and may have another shape such as a square bottom as long as it has good self-supporting property.

In the container 1 of the present invention, a dedicated molding spout 6 called a spout made of synthetic resin, as shown in FIG. 1 or 3, is attached to the linear seal portion 4 at the upper end by a heat sealing method. As shown in FIG. 5, the spout 6 is sandwiched between the laminated papers forming the opposite openings with the bag mouth opened, and the laminated papers 5a, 5b are attached from both sides. By pressing a pair of pressure type seal heads 7a, 7b against the laminated paper and pressurizing and heating the laminated paper into a shape corresponding to the outer peripheral shape of the spout, the laminated paper is mediated by the thermoplastic resin coming to the inner surface side of the container. And the outer peripheral surface of the spout body by fusion bonding. The laminated paper, which constitutes the main body of the container, is fixed so that liquid does not leak from between the spout body and the laminated paper. The shape of the spout shown in the drawing is formed to have a rhombic cross section or a flat tubular cross section so that the base sandwiched between the laminated paper can be easily adhered, but the shape is not limited to this and may be a cylindrical shape. . Further, it is preferable that the cylindrical portion extending to the outside of the container is formed into a cylindrical shape and provided with a screw cap.

In the above embodiment, the synthetic resin spout 6 is heat-sealed to the top of the container, but the synthetic resin spout is heat-sealed to the side seals or corners of the container. It is also possible to wear it.

FIG. 4 shows an example of the manufacturing process of the standing pouch-shaped paper container according to the present invention, which is a roll-up material (laminated paper) in which a thermoplastic resin is laminated on at least one surface.
After feeding 5 from the feeding unit 20, the laminated paper is bent by a homer composed of a side guide 22 and a central guide 21. First, the side guide 22 is folded in two so that the thermoplastic resin comes to the inner surface, and one side end portion (the portion that becomes the bottom of the container) of the laminated paper is placed inside by the center guide 21. After being formed into a W-shaped cross-section by being folded in, the resin spout 6 is inserted into the other side end portion (the portion which becomes the top of the container) of the laminated paper folded in two by the spout feeder 23 and at the same time added. By pressing the pressure type sealer 24, the side end portion (top portion of the container) is sealed in a palm shape, and the laminated paper is formed in a tubular shape and pulled out downward. During the drawing process, the bottom seal 2
5 and a seal (horizontal seal) 26 at the boundary of each container are performed, and then a predetermined amount of content is filled with a content filling pipe 27 inserted into a tubular packaging material. After filling and sealing (horizontal sealing) the container, cutting at the next boundary 28 with the container and discharging to the discharge conveyor 29, attachment of the spout and filling of the contents can be performed at the same time. The vertical pouch forming method is shown.

[0019]

EXAMPLES The present invention will be further described with reference to Examples and Comparative Examples. (Example 1) Stretched paper manufactured by Clu-pack processing (Curl-pack paper): 73 g / m ² basis weight, elongation at break according to JIS P8113 8.0% vertical (8.5% horizontal), 50 μm thick polyethylene on one side Using the laminated papers laminated, as a base material of the container, polyethylene was placed on the inner surface to form a bag by the method shown in FIG. 4, and the container shown in FIG. 1 was prepared. However, softwood kraft pulp was used as the pulp for producing the stretched paper. The paper width of the unwinding roll in FIG. 4 was 420 mm, and the paper width was 420 mm also in the following Examples and Comparative Examples. The longitudinal direction of the stretched paper was the direction in which a tensile force was applied when the spout was heat-sealed.

Example 2 The same stretched paper as in Example 1 was used as the base material of the container except that polyethylene having a thickness of 50 μ and polyethylene having a thickness of 20 μ were extruded twice to thicken the inner surface layer. The container shown in FIG. 1 was obtained.

(Comparative Example 1) Bleached kraft paper instead of Kurupack paper: Basic weight 70 / m ² , breaking elongation according to JIS P8113 2.0% length (4.0% width) One side of polyethylene of 50 μm thickness. Laminated laminated paper was used as a base material of a container and formed into a bag shape with polyethylene on the inner surface by the method shown in FIG. 4 to prepare the container shown in FIG. However, the longitudinal direction of the kraft paper was the direction in which a tensile force was applied when the spout was heat-sealed.

Comparative Example 2 Bleached Kraft Paper: Basis Weight 100 /
m ² , breaking elongation according to JIS P8113 2.0% vertical
A container similar to that of Comparative Example 1 was prepared, except that a laminated paper having a thickness of 50 μm laminated on one side (4.0% in width) was used as the base material of the container. The longitudinal direction of the kraft paper was the direction in which a tensile force was applied when the spout was heat-sealed.

When the presence or absence of paper breakage at the time of spout sealing in the containers of Examples 1 and 2 and Comparative Example 1.2 was confirmed, paper breakage occurred at the spout mounting portion in the containers prepared in Examples 1 and 2. However, in the containers prepared in Comparative Examples 1 and 2, paper breakage occurred at the spout mounting part, the appearance of the container was impaired, and liquid leakage occurred at the breakage part.
The results of Examples and Comparative Examples are shown in Table 1.

[0024]

[Table 1]

[0025]

As described above, according to the present invention, since the main body of the container is formed of a material mainly made of stretched paper having a particularly high elongation rate, a standing pouch or the like that does not cause breakage in the spout mounting portion, etc. Can be manufactured. Further, in the invention of claim 5, as compared with a conventional container using a resin film alone or a composite film as a base material, the self-sustaining property is improved by molding and filling and sealing using a laminated paper sheet. , It has become possible to manufacture a standing pouch with a spout that is relatively rigid and easy to stand on its own. Further, since the container of the present invention is formed of a material mainly composed of paper, it is excellent in that it can be directly printed on the paper and there are few incineration treatment problems.
In addition, the container of the present invention has an advantage in that it is possible to use the existing standing pouch device almost as it is in terms of equipment, so that no major modification is required.

[Brief description of drawings]

FIG. 1 is a perspective view showing a standing pouch according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an external appearance of a container (pouch) according to another embodiment of the present invention before forming a seal portion spout.

3A and 3B show a standing pouch according to another embodiment of the present invention, in which FIG. 3A is a front view and FIG. 3B is a side view.

4A and 4B are explanatory views showing an example of a manufacturing process of the standing pouch-shaped paper container shown in FIG. 1 of the present invention, in which FIG. 4A is a top view and FIG. 4B is a side view.

FIG. 5 is an enlarged sectional view of a spout adhesive portion.

[Explanation of symbols]

1 container 2, 3 Side seal part 4 Upper seal part 5, 5a, 5b Paper base material (laminated paper) 6 Molding spout (spout) 7a, 7b Seal head

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E050 AA01 AA02 AB02 AB08 BA01                       BA03 CA01 CA06 CA08 CB01                       CC01 CC07 DA04 DB01 DB04                       DC02 DC08 DD03 DE01 DF01                       DG07 DH10 EA10 FA01 FA07                       GA02 GB06 GC07                 3E056 AA05 BA01 BA03 CA02 DA01                       FD06                 3E064 AB23 BA05 BA22 BB03 EA30                       FA03 GA04 HN65

Claims (5)

[Claims] 1. A paper container in which a thermoplastic resin layer is formed on at least one surface of a paper layer so that the thermoplastic resin layer serves as an inner surface layer of the container. The peripheral edge portion is heat-sealed with laminated paper facing each other through the thermoplastic resin layer,
A spout formed by a separate member is sandwiched between the facing portions of the facing laminated paper in the sealing portion, and is bonded and fixed by heat fusion. Further, the paper layer forming the main body of the container is made of stretched paper. A paper container with a spout characterized by being configured. 2. The elongation at break defined by JIS P8113 of the stretched paper is 4% to 10% in a direction in which a tensile force is applied when the spout is heat-sealed. Paper container with a spout. 3. The paper container with a spout according to claim 1, wherein the stretched paper is Kurupack paper or crepe paper. 4. The longitudinal direction of the stretched paper (the flow direction of the paper at the time of manufacture) is a direction in which a tensile force is applied when the spout is heat-sealed. The paper container with a spout described in 1. 5. The container is a self-supporting bag container, and a separately prepared molding spout made of synthetic resin is attached to the linear seal portion on the top of the container by heat fusion. The paper container with a spout according to any one of claims 1 to 4, characterized in that