JPH11321885A - Pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pouch which is easy to unseal and which allows contents to be taken out stably without using a special member such as a pouring port. SOLUTION: The pouch is formed by overlaying oriented films wherein an orientation direction (e) of the oriented film is identical to a slant direction of a tear-starting portion 3 or either laminate forming a sheet of a front panel Pf and a rear panel Pb includes a slantly oriented film while the orientation direction (e) of the oriented film included in the front panel Pf and the orientation direction (e) of the oriented film included in the rear panel Pb slantly intersect each other. In this case, a slant direction of the tear-starting portion 3 is identical either to the orientation direction (e) of the oriented film included in the front panel Pf or to the orientation direction (e) of the oriented film included in the rear panel Pb.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch made of a soft wrapping material, which has an easy-open property, and a structure and a material capable of stably taking out stored contents.

[0002]

2. Description of the Related Art A pouch made of a flexible material and having a peripheral portion hermetically sealed by heat sealing or the like is sold as a packaged product filled with various contents. To open these pouches, a method of forming an opening by peeling off the heat sealing portion or cutting (cutting) the sealing portion of the peripheral portion of the pouch using a tool such as scissors, without using the tool. There is a method of opening the bag by tearing the pouch by hand. When scissors or the like are used, an arbitrary opening can be formed by cutting the cutting position and angle, but if scissors or the like are not at hand, opening may be difficult. For this purpose, easy-open pouches have been proposed and put into practical use. That is, there is a method in which a notch is provided in the periphery of the pouch, and the opening is formed by tearing the pouch by hand. It can be opened by hand without using tools such as scissors as described above. In the case of a pouch for storing light-weight and low-moisture contents, the thickness of the packaging material constituting the pouch is generally thin, and as described above, the heat seal portion is peeled off or the tearing start portion ( A notch or the like was provided, and the pouch could be easily opened simply by tearing the pouch from the notch. More specifically, FIG. 11 is a diagram illustrating a conventional pouch and its structure. For example, as shown in FIG. 11 (a-1), the pouch 101 is a pouch in which heat sealing surfaces of a front panel 100Pf and a rear panel 100Pb face each other to form a heat seal portion. The opening is
A tear line 104f is expected inside the seal portion 102 on one side thereof and parallel to the seal portion 102, and a tear start portion 103 is formed at the end of the pouch of the tear line 104f.
The tear initiation portion 103 may be provided at both ends of the pouch. The shape of the tear start portion 103 is shown in FIG.
As shown in (d), generally, I notch (d-1), V
It is provided in a shape called a notch (d-2), a U notch (d-3) or a UV notch (d-4).

[0003]

In particular, when the content is a liquid or a viscous material, the thickness of the laminated material constituting the pouch is preferably set in order to prevent the bag from breaking or leaking. Often thick. When the heat seal layer is thick, the tear resistance at the time of opening becomes large, and it is difficult to tear the tear direction in a desired constant direction even if a tear start portion is formed. Specifically, FIG.
As shown in FIG. 11B, when opening the pouch 101, the user holds the pouch 101 in his / her hand, and
The pouch 101 is torn to form an opening 100k. At that time, as shown in FIG. 11B, the tear line is torn in parallel with the seal portion inside the seal portion (104).
f) is ideal, but in practice, it may bend toward the contents (104g) or bend toward the seal portion (104h) and the opening may become extremely small. When the content is a liquid or a viscous material, the content may come out in a greatly spread state at the time of pouring, and may spill out of the container 100H (dish) for containing the content. Although not shown, a pouch with a spout that stabilizes the pouring by attaching a separate spout made of a plastic molded product or the like to the pouch has been proposed, but this type of pouch is opened (opened). The plug is easy, and stable pouring is possible, but a process for mounting the pouring port is required, and a mold for manufacturing the pouring port is also required. The cost of the resulting container is high. An object of the present invention is to provide an inexpensive pouch having easy opening properties and capable of stably taking out contents without using a special member such as a spout.

[0004]

According to the present invention, a heat-sealing surface of a front panel and a rear panel made of a laminated material having a heat-sealing layer on one surface are overlapped with each other so that the heat-sealing surfaces face each other. In a pouch formed with a heat-sealed portion, a laminated material constituting any of the front panel and the rear panel constituting the pouch, including a film stretched in an oblique direction with respect to the pouch, and The pouch is a pouch provided with a tear start portion in an oblique direction toward an opening at a heat seal portion at a peripheral end portion of a corner portion of the pouch, and a stretching direction of the stretched film and an oblique direction of the tear start portion are the same. Or both of the laminated materials forming the sheets of the front panel and the rear panel include a film stretched in an oblique direction, and a method of stretching the stretched film included in the front panel. Stretching direction of the stretched film containing the rear panel is superposed so as to intersect obliquely with each other and,
A pouch in which a heat-sealed portion is formed at a peripheral end of the panel, and in this case, the oblique direction of the tear start portion is any one of a stretching direction of a stretched film included in a front panel and a stretching direction of a stretched film included in a rear panel. The same as the stretching direction.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A pouch according to the present invention is a pouch in which an opening can be formed at a corner thereof, wherein the opening has no difference in shape or size due to individual differences of users. It can be easily opened. FIG. 1 shows an embodiment of the pouch of the present invention, (a) front view, (b) Z _1.
-Z ₁ part cross-sectional view, an enlarged view (c) Y ₁ parts 2,
It is a figure which shows the state of taking out contents after forming an opening part. 3 and 4 show two other embodiments of the pouch of the present invention. FIG. 5 is a cross-sectional view showing a material configuration example of a laminated material forming the pouch of the present invention. FIG. 6 is an explanatory diagram of a stretching direction of a stretched film used for the pouch of the present invention. 7 to 10 are explanatory diagrams of the pouch according to the present invention and the pouch according to the related art used when the contents are actually filled and the usability is compared.

Conventionally, the opening is formed by tearing the entire opening side α of the pouch as shown in FIGS. 11 (a) and 11 (c) to form the opening. If the opening can be provided in the corner of the pouch,
Focusing on the fact that the opening can be made to an appropriate size, it is easy to transfer the contents to another container (dish), and the opening is easily and stably formed at the corner of the pouch. After earnestly studying the matter, they came to the present invention.

More specifically, as shown in FIGS. 1 (a) to 1 (c), a pouch according to the present invention comprises a uniaxially stretched film and a packaging material comprising a heat-sealing layer on one side. Front panel Pf and rear panel Pb using
The stretch direction of the stretched film laminated on at least one of the laminates of the front panel Pf and the rear panel Pb is oblique to the pouch, and the respective heat-sealing surfaces are overlapped with each other to form a peripheral portion thereof. Is heat-sealed to form a seal portion to form a pouch, and the seal portion 2 at a corner near the opening of the pouch 1 is provided with either the front panel Pf or the rear panel Pb. A tear initiation portion 3 having a shape to start tearing in the same direction as one of the stretching directions e is provided. As shown in FIG. 2, as shown in FIG. 2, an opening k is formed by tearing the pouch diagonally from the tear start portion 3, and the contents C can be taken out from the opening k. The formation of the opening of the pouch of the present invention may be performed by deforming the pouch shape of the opening of the pouch 1b as shown in FIG. 3 or by sealing the non-opening as shown in the pouch 1b as shown in FIG. The present invention can be applied to a pouch having a changed shape.

[0008] In the pouch according to the present invention,
Using a sheet in which a stretched film stretched in an oblique direction with respect to the front view of the pouch is laminated on each of the front panel and the rear panel, when the pouch is formed, the stretching direction of the stretched film in the sheet of the front panel and the rear panel The same effect can be obtained even when the stretching direction of the stretched film in the sheet is the same.

The present inventors have further studied and, as a result, laminated a stretched film stretched obliquely with respect to the pouch on each of the laminated materials of the front panel and the rear panel,
And, the stretching direction in the front panel and the rear panel,
By crossing each other to form a pouch, and by providing a tear initiation portion in the same direction as the stretching direction of the stretched film included in either of the front and rear panels, surprisingly good tearability, It has been found that an opening can be formed.

[0010] As described above, when the stretched directions of the stretched films laminated on both the front panel and the rear panel of the pouch cross each other obliquely when the pouch is stretched, the laminating material used for the front panel is required. The laminated materials used for the rear panel may be separately prepared, and the stretching directions of the stretched films laminated on each other may be crossed when the respective heat sealing surfaces are overlapped. Further, even if the same laminated material obtained by laminating the stretched films stretched obliquely with respect to the flow direction of the film is folded, the stretching directions of the laminated stretched films intersect. FIG. 6 is a hypothetical view in which the pouch of FIG. 3A is developed by peeling the peripheral seal portion with W as the center line for explanation. Front panel P
f, the stretching direction e of the stretched film laminated on the rear panel P
The stretching direction e ′ of the stretched film laminated on b is exactly the same direction. In the pouch bag making process, the front panel Pf and the rear panel Pb on the opposite side with the folding line W as the center, When the heat sealing surface was folded inward with the folding line W in the middle and the periphery was sealed, the stretching directions e and e ′ of the stretched films laminated on the front and rear panels respectively crossed obliquely. Can be a pouch.

When making the pouch according to the present invention, FIG.
The flow of the film at the time of forming the pouch is taken as the direction D, and the laminating material including the stretched film stretched in the oblique direction with respect to the flow of the film is supplied to the bag making machine as a wide sheet. A predetermined portion (pouch peripheral portion) by folding the sheet with the heat sealing surface and the folding line W inside.
By heat sealing, the front panel Pf and the rear panel Pb of the obtained pouch can be formed into a pouch in which the stretching directions e and e 'of the underlying stretched film are crossed.

In this way, the tearability of the pouch in a state where the stretched films laminated on both the front panel Pf and the rear panel Pb intersect with each other depends on the tearability of the stretched film laminated on the front panel Pf or the rear panel Pb. It was found that it was easy to tear in any stretching direction. In this case, the tearing start portion 3 is provided at the end of the pouch 1a to facilitate initial tearing, but the tearing direction of the tearing start portion 3 is changed to the front panel Pf.
If it matches the stretching direction of the stretched film laminated on
If the stretched film laminated on the front panel Pf is torn in the stretching direction e, and if the tearing direction of the tear start portion 3 matches the stretching direction of the stretched film laminated on the rear panel Pb, The film is torn in the stretching direction e 'of the stretched film laminated on the rear panel Pb. in this way,
It was found that the film could be torn in either the stretching direction of the stretched film in the laminated material of the front panel Pf or the rear panel Pb, and the tear initiation portion 3 pointed, for example, in the desired direction of the notch tearing direction. What is necessary is just to provide as a state. There are various shapes and methods for the tear initiation part 3, but in the present invention, tearing can be started and tearing can be started along the stretching direction of the stretched film in the laminated material. Well-known I notches, V notches, U notches, UV notches and the like can be used. The pouch 1a of the present invention configured as described above can be very easily and surely torn.

In order to form the openings k at the corners of the pouch 1a, a film stretched at an inclined angle with respect to the flow of the film in the stretching direction of the stretched film has an appropriate layer structure. What is necessary is just to laminate in a laminated material like this.

The pouch 1a of the present invention is provided with an opening k at a predetermined portion, but the shape of the bag other than the opening k is not limited. For example, as shown in FIG. 3, the bag 1b has an appearance in which the corners on both sides are cut off, and when opening, the corners are torn diagonally, resulting in the corners of the bag 1b. The contents C can be taken out from the section. Moreover, the pouch 1 at the time of opening
Since the tearing direction of b is always constant, the size of the opening is also constant, and the removal of the contents is stabilized.

As another embodiment, as shown in FIG. 4, when the opening of the pouch of the present invention is formed by cutting off the other corners of the side including the opening of the pouch 1c, The opening side is a pouch having a shape suitable for use such as squeezing out contents.

In the present invention, the shape of the pouch shown above is only an example of a part of the shape, and the present invention is not limited to the shape. The shape of the pouch is not shown in the present invention. Various forms can be adopted, and for example, it may be used for a self-supporting pouch, a bottom gusset pouch, a boat bottom seal pouch, and other pouches.

Next, in the present invention, a packaged product in which the contents are filled in the pouch according to the present invention as described above will be described. The contents are filled in such a manner that the side with respect to the side forming the opening is in an unsealed state. The contents are filled from the side of the unsealed portion, and then the unsealed portion is heat-sealed and sealed to obtain a packaged product.

The laminated material constituting the pouch of the present invention comprises:
Including a stretched film, at least one side of the laminated material is formed of a heat-sealable layer, but as in a general packaging material configuration, other necessary layers, such as a base layer and a barrier layer. They may be stacked. As a specific laminated material, the following configuration is shown as shown in FIG. A. B. base layer 11 / adhesive layer 15 / stretched film layer 12 / adhesive layer 15 / heat sealant layer 14 B. base layer 11 / adhesive layer 15 / stretched film layer 12 / adhesive layer 15 / barrier layer 13 / adhesive layer 15 / heat sealant layer 14 Base material layer 11 / adhesive layer 15 / barrier layer 13 / adhesive layer 1
5 / Stretched film layer 12 / Adhesive layer 15 / Heat sealant layer 14 In the above configuration, except for the adhesive layer 15, the configuration A is 3
Although the layers B and C are each a four-layer structure, the difference is the position of the stretched film layer 12 and the barrier layer 13 in the laminate.

The base material layer 11 is often used as a printing base material. For this reason, a film having the tensile strength and heat resistance required for dimensional stability during printing and having good printing ink receptivity is desirable. Specifically, a stretched or unstretched film formed from a resin such as polypropylene, polyester, or polyamide can be used. Alternatively, a film on which an inorganic oxide such as silicon oxide or aluminum oxide is deposited may be used.

The laminated material constituting the pouch of the present invention is obtained by laminating a stretched film described below, that is, a film that is stretched obliquely with respect to a film flow or a square or rectangular pouch in a front view. I do. Specific examples of the film stretched in the oblique direction include a stretched film (product name ONMG) of Unitika Ltd.

For the barrier layer 13, a material having a necessary barrier property and its thickness are selected from the kind of contents, the expiration date of beverages and foods, and other possible expiration dates. Specific materials include aluminum foil or polyamide, polyester, polyvinylidene chloride, polyvinyl alcohol, a film made of saponified ethylene-vinyl acetate copolymer, or a barrier coating agent made of polyvinylidene chloride or the like on these films. It may be used by coating or by vapor deposition of a metal such as aluminum or tin, or an inorganic oxide such as silicon oxide.

The heat-sealing layer 14 has a heat-sealing strength between the heat-sealing layers, does not break the bag as a pouch, and has a heat treatment for sterilizing the contents. It is necessary to select a material having the above heat resistance. Specific examples of the resin constituting the heat seal layer 14 include low-density to high-density polyethylene, polypropylene, linear low-density polyethylene, an ethylene / α-olefin copolymer polymerized using a metallocene catalyst, and ethylene / acetic acid. Vinyl copolymer, ethylene ethyl acrylate, ethylene acrylic acid, ethylene methacrylic acid, ethylene methyl acrylate, ionomer, and the like can be used.

The above-mentioned substrate layer 11, stretched film layer 12,
An adhesive layer 15 may be interposed between the barrier layer 13 and the heat sealant layer 14. Adhesive layer 1
Reference numeral 5 denotes an adhesive or an adhesive resin layer used in a normal laminating step, for example, a polyurethane-based adhesive used for lamination by a dry lamination method or an adhesive resin layer of a sandwich laminate performed using an extruder. You may. An anchor coating agent used when forming a heat sealant layer or the like by extrusion coating may be used.

In the present invention, the pouches made of the above-mentioned materials and structures can be used for various purposes. For example, pouches such as beverages, powdery and granular foods, and retort foods are mainly used. Consisting of dense contents,
Further, it can be used as a pouch suitable for filling and packaging toiletry products, pharmaceuticals and other articles other than food.

[0025]

The present invention will be described more specifically with reference to the following examples. [Example 1] Pouch shape: As shown in FIG. 7 (a), the shape of the tear start portion is U-cut deformation, and as shown in FIG. 7 (b), the tear start portion is in the same direction as the film stretching direction. Provided. Pouches each part dimensions: x ₁ = 230 mm, width of y ₁ = 290 mm opening: 35mm contents: Material raw crumbs 150g pouch: VM- PET12 / ON- / LDPE25 [abbreviation VM- PET: aluminized polyester film , ON-: stretched nylon film, LDPE: low-density polyethylene film] Material used: VM-PET: Tetraite-SG (trade name of Oike Industry Co., Ltd.) ON-: Emblem ONMG (trade name of Unitika Ltd.) LDPE: Extrusion Coating method, Mitsubishi Polyethylene-LD LC701 (Mitsubishi Chemical Corporation)

[Example 2] Pouch shape: As shown in FIG.
As shown in FIG. 7 (b), a cut start portion was provided in the same direction as the stretching direction of the film. Pouch dimensions of each part: x ₂ = 130 mm, the y ₂ = 180 mm opening width: 35mm contents: Material retort curry 200g pouch: PET12 / Al7 / ON- 15 / CPP 60 [Symbol AL: aluminum foil] Using materials : PET: Toyobo Ester Film ES102 (Product name of Toyobo Co., Ltd.) ON-: Emblem ONM-G (Product name of Unitika Co., Ltd.) CPP: Trefane NO ZK93 (Toray Synthetic Film Co., Ltd.)
Product name)

Comparative Example 1 Shape of Pouch: As shown in FIG. 8A, the shape of the tearing start portion was an I-notch as shown in FIG. 8B. Pouch dimensions of each _{part: x 1 '= 230mm, y} 1' of = 290 mm opening width: 200 mm Contents: Material Raw bread crumbs 150g pouch: VM-PET12 / ON- 15 / LDPE30 [ abbreviation ON-: oriented nylon film Materials used: VM-PET: Tetraite-SG (Oike Industry Co., Ltd. product name) ON-: Harden N-1202 (Toyobo Co., Ltd. product name) LDPE: Extrusion coating method, Mitsubishi Polyethylene-LD LC701 (Mitsubishi Chemical Corporation) Co., Ltd. product name)

Comparative Example 2 Shape of Pouch: As shown in FIG. 10A, the shape of the tearing start portion was a UV notch as shown in FIG. 10B. Pouch dimensions of each part: x ₂ = 130 mm, the y ₂ = 180 mm opening width: 160 mm Contents: Material retort curry 200g pouch: PET12 / Al7 / ON- 15 / CPP 60 [Symbol PET: Polyester Film] Using materials : PET: Toyobo ester film ES102 (trade name, manufactured by Toyobo Co., Ltd.) ON-: Harden N-1202 (trade name, manufactured by Toyobo Co., Ltd.) CPP: Trefane NO ZK93 (Toray Synthetic Film Co., Ltd.)
Product name)

<Results of Examples and Comparative Examples> Example 1 and Comparative Example 1 Raw bread crumbs, which are bulky contents, were filled into a pouch of the present invention and a pouch of the prior art, and the opening property and other properties of each pouch were determined. Was compared with each other, but there was no problem with the opening property (tear resistance) of both, and there was no significant difference. However, in the comparative example, the direction of the tear line was not constant, and the shape of the opening sometimes varied, whereas the opening formed in the pouch of the example always had a constant size. . In taking out the product, since the opening of the comparative example was the whole side, there was a case where the contents were spilled out when transferring the contents to the container, whereas in the case of the pouch of the example, without spilling I was able to transfer it without fail. Example 2 and Comparative Example 2 The above packaged product was heated in boiling water for 10 minutes, taken out, and immediately torn with the tear start portion (notch portion for opening) in hand. Example 2 was extremely simple. In addition, the spout can be easily formed, and the formed spout was of a predetermined size, whereas in Comparative Example 2, similarly, the spout was heated in hot water for 10 minutes. After heating, take it out,
Immediately after the tearing start (opening notch) was torn by hand, the tear resistance was strong. In some cases, the spout was torn in the direction away from the expected tear line when forming the spout. But it was not constant. Since the opening of the pouch of Example 2 had a size in which the spout was narrowed to the corner of the pouch, there was no danger of spilling to the outside of the other container when taking it out into another container. Comparative Example 2
Since the opening of the pouch is the entire area of one side of the bag, when transferring the retort curry as a content to another container,
There was a case that spilled outside.

[0030]

According to the pouch of the present invention, a pouch is formed by using a laminated material containing a uniaxially stretched film stretched at least obliquely with respect to the pouch, and the pouch is stretched to a heat seal portion near a corner of the pouch. By providing the tear start portion in which the stretching direction of the film and the tear direction for the opening of the pouch are matched, when forming the opening of the pouch, there is easy opening, and the length of the tear is short, that is, The pouch was easy to open and could form an opening narrowed down to the corner of the pouch. As a result, the present invention can be applied to foods that are eaten by heating, such as pouches for retort foods. In addition, by narrowing the opening, the contents can be stably poured into another container or dish to be transferred.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a pouch of the present invention, (a) front view, (b) sectional view of a Z ₁ -Z ₁ part, and (c) enlarged view of a Y ₁ part.

FIG. 2 is a diagram showing a state in which contents are taken out after an opening is formed;

Figure 3 shows another embodiment of the pouch of the present invention, (a) front view, (b) Y ₂ parts enlarged view

FIG. 4 shows a third embodiment of the pouch of the present invention, (a).
Front view, (b) Y ₃ parts enlarged view

FIG. 5 is a cross-sectional view showing a material configuration example of a laminated material constituting the pouch of the present invention.

FIG. 6 is an explanatory view of a stretching direction of a stretched film used for the pouch of the present invention.

FIG. 7 shows a fourth embodiment of the pouch of the present invention, (a).
Front view, (b) Enlarged view of Ya section

8 (a) is a front view showing a conventional pouch, and FIG.
b ₁ part enlarged view, (c) Yb ₂ part enlarged view

FIG. 9 shows a fifth embodiment of the pouch of the present invention, (a).
Front view, (b) Enlarged view of Yc section

10 (a) is a front view showing a conventional pouch, and FIG.
Yd ₁ part enlarged view, (c) Yd ₂ part enlarged view

FIG. 11 is an explanatory view of a pouch according to a conventional technique.

[Explanation of symbols]

 C, 100C Contents H, 100 Receiving container Pf, 100Pf Front panel Pb 100Pb Rear panel e Stretching direction p Ink w Fold line k Opening 1,20,30,40,50 Pouch 2,22,32,42,52 Seal part 3,23,33,43,53 Tearing start part 4,24,34,44,54 Tearing line or scheduled tearing line 5 Cut off piece 10 Laminated material 11 Base material layer 12 Stretched film layer 13 Barrier layer 14 Heat seal layer DESCRIPTION OF SYMBOLS 15 Adhesive layer 101 Pouch 102 Seal part 103 Tearing start part 104 Tearing line or scheduled tearing line

Claims (4)

[Claims] 1. A heat-sealing portion is formed at the peripheral edge of the panel, with the heat-sealing surfaces of a front panel and a rear panel made of a laminated material having a heat-sealing layer on one surface facing each other and facing each other. In the pouch, the laminated material constituting one of the front panel and the rear panel constituting the pouch includes a film stretched in an oblique direction with respect to the pouch, and a peripheral edge of a corner portion of the pouch. A pouch characterized in that a tear start portion is provided in a heat seal portion of the portion in an oblique direction toward an opening. 2. The stretching direction of the stretched film and an oblique direction of a tear start portion are the same.
Pouch described in. 3. A laminated material forming a sheet of the front panel and the rear panel includes a film stretched in an oblique direction, and a stretching direction of a stretched film included in a front panel and a stretched film included in a rear panel. The pouch according to claim 1, wherein the pouches are overlapped so that their stretching directions cross each other obliquely to form a heat seal portion at a peripheral edge of the panel. 4. The stretch direction of the tear start portion is the same as the stretch direction of the stretch film included in the front panel or the stretch direction of the stretch film included in the rear panel. A pouch according to claim 1 or claim 3.