JP2001130597A - Paper pouch with spout and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper pouch with a spout which is excellent in self-supporting ability, flexible and excellent in shape retention wherein the pouch has a spout which allows contents to be removed/sealed at will, and its manufacture is simple. SOLUTION: The paper pouch with a spout comprises a summit 3 formed by hutt-seam-sealing one of ends 31 of a paper laminate and the other end 32 parallel thereto with a plastic spout 6 interposed therebetween, a side face 4 formed by hutt-seam-sealing ends 41 orthogonal to both ends of the laminate and folding, and another side face formed by hutt-seam-sealing other ends orthogonal to both ends and folding. The pouch 1 can be manufactured of a single paper laminate when filling contents.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spouted paper pouch used as a container for liquid foods, fluid foods and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Soft plastic flexible containers (pouches) for filling liquid foods such as juice, coffee, milk and liquors and liquid foods such as ketchup and mayonnaise are used when the amount of filling is reduced or the filling becomes full. There is a problem that independence (stand ability) cannot be maintained when filled or the like, and several methods have been used to impart independence. For example, on the main body formed by sealing two laminated films together with a palm, a laminated film of the same configuration was sealed together with an inverted U-shape or an inverted V-shape to form a bottom part to give independence. The four laminated films are sealed together in a gusset shape so that the sides of the film have folds, form a body, and the top is folded to form a bottom, forming a bottom and using the weight of the contents. Some are self-sustaining.

[0003] On the other hand, there is known a conventional standing pouch, such as the one described above, in which a plastic spout portion called a spout for pouring out contents is attached to the top thereof. A recloseable spout provided with a lid that can be opened and closed to prevent the contents once opened and to protect the contents is also used.

Conventionally, these standing pouches have
First, two or four laminated films having the same configuration are supplied from each reel, and the inner surfaces thereof are
Usually, a bag is formed while being cut into a fixed shape by a three-side seal on the bottom and both sides of the bag. When the spout is mounted on the side, the spout is sealed at the same time. Next, after the obtained bag is sterilized in advance with an electron beam such as gamma ray or ethylene oxide gas, the food is filled in a sterile room or the like from a non-sealed portion of the bag, or heat-sterilized by hot filling. Alternatively, the food is subjected to a post-sterilization treatment, such as a retort, to maintain the safety (sanitation) of the food, and a spout is attached to seal the non-sealed portions.

[0005]

In order to make the container self-supporting, a wide bottom surface such as a conical shape or a hard material may be used. When filling foods, etc., since the force applied to the foods is not uniform on the inner surface of the container, the bottom surface is inverted U-shaped or inverted V-shaped as described above, or the side surfaces of the container are sealed and reinforced. If the bottom is widened, it is disadvantageous for storage of the container. On the other hand, when using a hard material,
The contents cannot be taken out by holding the container,
In particular, in the case of a liquid food, it is necessary to shake the container.

In the conventional standing pouch, the bag making process, the filling process, the treatment (sterilization, sterilization) process, and the spout insertion process are performed independently as described above. Was inferior.

An object of the present invention is to provide a paper pouch with a spout which has excellent spontaneity, is flexible, has good shape retention, has a spout which can freely take out and confine the contents, and whose production is simple. With the goal.

[0008]

Means for Solving the Problems As a result of diligent research, the present inventor has paid attention to flexible paper laminates, and has achieved the object of the present invention by manufacturing them using a special method. The inventors have found out what can be done and completed the present invention.

That is, the present invention is formed from a single sheet of paper laminate, and one end of the paper laminate and the other end parallel thereto are formed with a plastic spout interposed therebetween. The formed top portion, one side surface formed by joining and folding one end portion perpendicular to the both end portions, and the other side portion formed by joining and folding the other end portion orthogonal to the both end portions are formed. A spout-attached paper pouch characterized by having the other side surface. Further, the paper pouch of the present invention is characterized in that the paper laminate has a paper layer, a plastic layer, and a barrier layer, and at least one surface of the paper layer is in contact with the surface of the plastic layer. Further, the paper pouch of the present invention is characterized in that the plastic layer is made of a polyolefin resin. Further, the paper pouch of the present invention is characterized in that the plastic spout is made of a polyolefin resin.

Further, the present invention provides a step of forming a top portion by sealing one end of one strip-shaped paper laminate and the other end parallel thereto with a plastic spout therebetween. Forming one side surface by sealing and folding one end portion perpendicular to the portion and forming the other side surface by sealing and folding the other end portion orthogonal to the both ends. And a method for producing a spouted paper pouch characterized by having:

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The paper pouch of the present invention is formed from a single sheet of paper laminate. A specific example of the paper pouch will be described with reference to the drawings. As shown in FIG. 1, the paper pouch 1 has a front 2, a top 3, a back (not shown), one side 4, and another side (not shown). ) And the bottom surface 5,
The top 3 has one end 31 of the paper laminate and the other end 32 parallel thereto sandwiching the plastic spout 6 (sealed together), and the side surface 4 has both ends 31, 32. One end 41 orthogonal to the seal 45
It is folded and formed. The other side surface (not shown) is configured similarly to the side surface 4.

On the side surface 4 (and the other side surface) of the top 3, the end 31 and the end 32 may be simply sealed at their ends as shown in FIG.
As shown in (b), it may be sealed and folded. When the seal 35 is applied as shown in FIG. 2 (a), the shape becomes as shown in FIG. 1. When the seal 35 is inserted and folded as shown in FIG. 2 (b), as shown in FIG. Shape. The paper pouch of the present invention comprises a top portion 3, a front surface 2, a back surface, one side surface 4, the other side surface, and a bottom surface 5 of a generally rectangular plane, and the bottom surface 5 is a pentagon, hexagon, octagon, etc. other than a rectangle. It may be formed from a polygon. In those cases, the pouch has a number of side surfaces corresponding to the number of corners, but the side surface 4 close to the top 3 has the spout 6 sandwiched therebetween, and thus has a two-sided planar shape as described above.

The paper laminate forming the pouch of the present invention comprises a laminate having at least a paper layer.
It is preferable that the paper layer has a paper layer, a plastic layer, and a barrier layer, and that at least one side of the paper layer is in contact with the plastic layer. Further, it is preferable that the outer and inner surfaces of the pouch are formed of a laminated material that becomes a plastic layer when the pouch is formed.

The plastic forming the plastic layer is preferably a thermoplastic resin. Examples of the thermoplastic resin include polyolefin resin, polystyrene resin, polyvinyl chloride resin, methacrylic resin, ionomer, unsaturated carboxylic acid-modified polyolefin, cyclic olefin copolymer, polyamide resin, polyester resin, and the like. They can be used together.

As the polyolefin resin, polyethylene resins (low density polyethylene, medium density polyethylene,
High-density polyethylene, linear low-density polyethylene, etc.), polypropylene resins (homopolypropylene, ethylene-
Propylene random copolymer, ethylene-propylene block copolymer, etc.), polybutene-1, polyhexene-
1, polymethylpentene-1 and the like.

[0016] The unsaturated carboxylic acid-modified polyolefin is
It is obtained by grafting an unsaturated carboxylic acid or a derivative thereof to the polyolefin resin. Examples of the unsaturated carboxylic acids include α, β-unsaturated carboxylic acids, alicyclic unsaturated dicarboxylic acids having a cis double bond in the ring, and derivatives thereof. α, β-unsaturated carboxylic acid, alicyclic unsaturated dicarboxylic acid having a cis double bond in the ring and derivatives thereof include acrylic acid, methacrylic acid, crotonic acid, maleic acid, maleic anhydride,
Nadic acid, nadic anhydride, tetrahydrophthalic acid,
Examples include tetrahydrophthalic anhydride, chloridic acid and the like.

The cyclic olefin copolymer is a copolymer of a cyclic olefin and ethylene or α-olefin. Examples of the cyclic olefin include cyclopentene, cyclohexene, cycloheptene, cyclooctene, and 2-norbornene, and α-olefins include propylene,
1-butene, 1-hexene, 4-methyl-1-pentene and the like can be respectively mentioned.

Examples of the polyamide resin include nylon 6, nylon 6.6, nylon 612, nylon 11, nylon 12, and the like. As polyester resin,
Examples include polyethylene terephthalate and polybutylene terephthalate.

Among the above plastics, polyolefin resins, especially polyethylene resins and polypropylene resins are desirable.

Specific examples of the barrier layer include aluminum foil, silica-biaxially stretched polyethylene terephthalate film, ethylene-vinyl alcohol copolymer film, polyamide resin film and the like and other members,
For example, a laminate with a polyethylene film or a polypropylene film may be used.

Specific examples of the above-mentioned paper laminate include polyethylene film (PE) / paper / PE / aluminum foil (A
L) / PE, polypropylene film (PP) / paper / P
E / AL / PE, PP / paper / PP / AL / PE, PE /
Paper / PP / AL / PE and the like. Such a paper laminated material manufactured by an extrusion lamination method is advantageous in cost.

The spout forming a part of the pouch is made of a plastic, and the plastic is preferably a thermoplastic resin. The thermoplastic resin is selected from thermoplastic resins desirably used in forming the paper laminate, and a polyolefin resin, particularly a polyethylene resin and a polypropylene resin, is desirable.

A specific example of the method for producing a spout according to the present invention having the above-described structure will be described below with reference to FIG. One strip-shaped paper laminate 11 usually wound in a reel shape is
Creases necessary for printing and folding at portions A and B described later are formed in advance by a method not shown. Then, after performing a sterilization process or the like, the sheet is moved by the roller 70 and squeezed by the pinch rollers 71 and 72 so that the end 31 and the end 32 are joined. As a result, a front surface 2 and a back surface (not shown) are formed. Next, the plastic spout 6 supplied in the part A is sandwiched between the end part 31 and the end part 32, and is sealed together with the end part 31 and the end part 32 to form the top part 3. At this time, in the portion A, the one end portions 41 are sealed together with the palm joint seal 45 and are folded to form the side surface 4. Further, in the part B, the other end portions 42 are sealed with the joint seal 46 and are folded to form the other side surface, and the spout 1 of the present invention is manufactured by cutting. At this time, the spouts 6 are attached in the portions A and B, and the side end portions 31 serving as the tops, which are sealed with palms, are provided.
2 is formed as shown in FIG. 1 if it is not folded as shown in FIG. 2A, and is formed as shown in FIG. 3 when it is folded as shown in FIG. 2B.

The gasket seals in the parts A and B are as follows:
Any method such as wet lamination with an adhesive, dry lamination, hot melt lamination, and heat sealing (heat sealing) may be adopted. The heat sealing is performed by heating gas, electric heat, ultrasonic waves, or the like. This is done by:

When the spout 6 is sealed by heat sealing, it is preferable to use the spout 6 provided with a heat seal layer on its surface. The heat seal layer needs to be a material capable of adhering the paper laminated material and the spout at a relatively low temperature, and examples thereof include an ethylene copolymer.

As the ethylene copolymer, ethylene and
A copolymer with a comonomer having a content of 10% by weight or less, particularly 5% by weight or less is preferable. As comonomer,
Propylene, 1-butene, 1-hexene, 4-methyl-
Α-olefins such as 1-pentene and 1-octene; vinyl acetate; α-unsaturated carboxylic acids such as acrylic acid and methacrylic acid; and lower alkyl esters thereof such as methyl and ethyl.

Among the copolymers of ethylene and the above comonomer, linear low-density polyethylene (including those produced with a so-called metallocene catalyst), which is a copolymer of ethylene and an α-olefin, and ethylene-vinyl acetate Copolymers are desirable, which have a melt flow rate (MFR) of 5 g / 10 min or less (190 ° C., load 2.1.
6 kg) is better.

In order to provide the heat seal layer on the surface of the spout, a spout having a heat seal layer may be integrally formed from the spout material made of the plastic and the heat seal material. As an integral molding method,
Examples include a co-injection molding (sandwich injection molding) method and an IML (injection molding label) method, with the IML method being particularly preferred.

The pouch of the present invention has a feature that it can be manufactured simultaneously with filling of contents. That is,
One paper laminated material continuously supplied from a reel or the like is preliminarily provided with a fold necessary for printing or folding at the above-mentioned portions A and B by a method not shown. Then, after performing a sterilization treatment or the like, as shown in FIG. 4, the front surface 2 and the back surface are formed by squeezing with pinch rollers 71 and 72 so that the end portions 31 and 32 are joined, and the spout is formed at the A portion. 6 is sandwiched between the end portion 31 and the end portion 32, and the top portion 3 is formed by sealing the palms, and the other end portion 41 is sealed by the palm joint 45 and folded to form the side surface 4. This A
After the content is filled in the part, the spout 1 of the present invention filled with the content is formed in the part B by sealing the other end portions 42 together with the joint palm 46, folding the other end side, and cutting it. Manufactured.

[0030]

Industrial Applicability The pouch of the present invention has improved self-sustainability and shape retention, is hardly crushed even when creeped because it is formed from a paper laminate, and is manufactured continuously from one continuous paper laminate. can do. In addition, the production can be performed at the time of filling the contents, in which case the supply of the paper laminate, the sterilization treatment and the filling of the contents can be continuously performed, and the aseptic filling can be performed at a low temperature. Because it can be done, the quality of the contents can be expected to improve.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pouch of the present invention.

FIGS. 2 (a) and (b) are partially enlarged views of an unfolded state and a folded state at the end of the top of the pouch of the present invention as viewed from above.

FIG. 3 is a perspective view of one embodiment of the upper part of the pouch of the present invention.

4 (a) and 4 (b) are explanatory views of one embodiment of the method for producing a pouch of the present invention, and FIG. 4 (b) is an arrow Y in FIG. 4 (a).
It is the side view seen from the direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pouch 2 Front 3 Top 4 Side 5 Bottom 6 Spout 11 Band-like paper laminate 31, 32, 41, 42 End of paper laminate 35, 45, 46 Seal 70 Roller 71, 72 Pinch roller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B31B 37/10 B31B 37/10 37/60 37/60 B65D 30/02 B65D 30/02 30/16 30 / 16 F

Claims (5)

[Claims] 1. A paper web formed from a single sheet of paper laminate, wherein one end of the paper laminate and the other end parallel to the top are formed with a plastic spout interposed therebetween. One side surface formed by joining and folding one end portion orthogonal to the both end portions, and the other side surface formed by joining and folding the other end portion orthogonal to the both end portions. A paper pouch with a spout, comprising: 2. The paper laminate according to claim 1, wherein the paper laminate has a paper layer, a plastic layer, and a barrier layer, and at least one surface of the paper layer is in contact with the plastic layer surface.
A paper pouch with a spout as described. 3. The paper pouch with a spout according to claim 2, wherein said plastic layer is made of a polyolefin resin. 4. The plastic spout according to claim 1, wherein said plastic spout comprises a polyolefin resin.
A paper pouch with a spout according to any one of the above. 5. A step of forming a top by sealing one end of one strip-shaped paper laminate and the other end parallel thereto with a plastic spout and forming a top, and intersecting at right angles with the both ends. Having a step of forming one side surface by sealing and folding one end portion together, and a step of forming another side surface by sealing and folding the other end portion orthogonal to the both ends together. A method for producing a paper pouch with a spout, comprising: