JP2001247160A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag on which the operation of unsealing a mouth section is discontinued on a proper site so as not to spoil decorations and the like applied on the front face and the like of the packaging bag when a packaging bag is unsealed. SOLUTION: The packaging bag is formed of a multilayer packaging film, and at least film layers oriented on one lateral axis are laminated on the packaging film, and a heat sealing film is laminated on the inner surface side of the packaging bag. The packaging bag is formed by heat sealing the heat sealing films one another, and a back sealed section formed by butt seam of the packaging films is provided on the back of the bag, and unsealing start section is provided on the back sealed section, and unsealing control sections on which the heat sealing films are heat sealed are formed on both ends on an extension line of a section forming an unsealing mouth when the bag is unsealed on the unsealing start section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a packaging bag. More particularly, the present invention relates to a packaging bag that can be easily opened and has an excellent opening shape.

[0002]

2. Description of the Related Art Conventionally, in a gusset bag or a pillow bag having a back seal portion, there is a packaging bag in which opening is facilitated by inserting an opening start portion into the back seal portion. No. 136964, Japanese Utility Model Publication No. 60-2
No. 5400), used for packaging foodstuffs and the like.

Further, a packaging bag which has a beautiful opening opening and does not tear in the other direction by using a horizontal uniaxially stretched film as a film forming the packaging bag containing the opening start portion has been developed.

However, in a conventional packaging bag,
When opened, the opening cannot be stopped at an appropriate place, and as a result, the opening opened around the packaging bag and was separated from the packaging bag body. Therefore, the opened packaging bag is in a state in which the upper end of the bag is completely opened, and there is no problem if the contents of the bag are used at once after opening, but once used, the contents are not changed. When the bag cannot be used and is further stored, it is necessary to close the opening again, and it is not preferable that the upper end of the bag is completely opened.

Further, in recent packaging bags, various decorations are often provided on the front face and the like, and in the conventional packaging bags, the upper end is cut off along with the opening and is completely open. When closing the opening, the decoration (product name, photograph, etc.) of the packaging bag was often broken and the appearance was spoiled.

[0006]

SUMMARY OF THE INVENTION According to the present invention, when a packaging bag is opened, it can be easily opened, and the opening can be stopped at an appropriate place. It is an object of the present invention to provide a packaging bag that does not destroy decorations and the like applied to the garment.

[0007]

To achieve the above object, the present invention provides a packaging bag using a multilayer packaging film according to claim 1, wherein the packaging film is at least horizontally uniaxially stretched. Laminating a film layer, laminating a heat-sealable film on the inner surface side of the packaging bag, the packaging bag is a packaging bag made by heat sealing the heat-sealable films,
In the packaging bag, a back seal portion formed by attaching the packaging film to the back of the bag is provided, and has an opening start portion on the back seal portion, and is opened by the opening start portion. The packaging bag according to any one of claims 1 to 3, wherein an opening suppressing portion formed by heat-sealing the heat-sealing film is formed at both ends which are extensions of a portion serving as an opening.

[0008] By laminating a film layer which is uniaxially stretched in a horizontal direction on a multilayer packaging film forming a packaging bag, the opening can be made straight when the bag is opened. By forming unsealing suppression parts at both ends of the part to be opened, when opening
Since the opening is stopped at the opening suppressing portion, the opening does not go around the packaging bag, and therefore, the decoration or the like provided on the front face of the packaging bag is not damaged. Furthermore, even when preserving the contents of the packaging bag, it is easy and convenient to reclose it again because the upper end of the packaging bag is not completely opened.
Further, by providing an opening start portion in the back seal portion, opening can be facilitated.

Further, according to the present invention, even when, for example, tea leaves, coffee, and the like are in the contents of the packaging bag, the upper end of the packaging bag is not completely opened. It is easy to keep it closed, and it is possible to protect the contents from moisture and the like.

Furthermore, as described in claim 2, when the packaging bag according to claim 1 is a gusset bag, the unsealing suppressing portion is located on the back side of the folded portion formed on the side surface of the gusset bag. It is preferably formed by heat sealing the folded portion and the back surface.

The gusset bag has a structure in which both sides are folded inward (folded portion), and it is easy to provide an unsealing suppressing portion by using the folded portion. It is suitable for.

Furthermore, as described in claim 3, when the packaging bag according to claim 1 is a pillow bag, the unsealing suppressing portion heat-seales the front and back surfaces of the pillow bag. Preferably, it is formed.

[0013] Pillow bags are often used as this type of packaging bag along with gusset bags, and the application range of the present invention to pillow bags is greatly expanded.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a (a) rear view and (b) aa sectional view of a packaging bag of the present invention, the shape of which is the shape of a gusset bag. The packaging bag 1 is formed by a packaging film 2, and the packaging bag 1 has a back seal portion 3 formed by attaching the packaging film to the back of the packaging bag, and the back seal portion 3. Is formed with an opening start portion 4 which is a trigger for opening. At both ends of the packaging bag 1, unsealing suppressing portions 5, 5 are formed at the same positions as the distance from the upper end of the packaging bag to the opening start portion 4.

Hereinafter, the configuration of the present invention will be described in detail.

(1) Packaging Film 2 First, the packaging film 2 used for the packaging bag 1 of the present invention will be described. The packaging film 2 used in the present invention is a multilayer film, characterized by laminating at least a film layer that has been stretched in the horizontal direction and a heat-sealing film on the inner surface side of the packaging bag 1. . Any film having the above characteristics can be used in the packaging bag 1 of the present invention. Therefore, as for each film for forming a multilayer structure, any film suitable for rigidity, heat resistance and workability can be selected and used according to the purpose and use of the packaging bag.

The material of each film is polyvinyl chloride, polyvinylidene chloride, polyamide, polyester, polyethylene, polypropylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer. A film manufactured from coalescence, an ionomer, or the like can be used, and paper may be laminated to enhance the design. In addition, a metal foil such as aluminum is attached to the packaging film 2 to impart strength and various barrier properties, and vinylidene chloride (a vinylidene chloride-acrylate copolymer having a high vinylidene chloride ratio is preferable). It is also possible to apply a barrier film such as polyvinyl alcohol, or to laminate a processed film on which a barrier material with a thin film layer such as aluminum, aluminum oxide, silicon oxide, indium oxide, tin oxide, and zirconium oxide is deposited. It is. Here, the method of forming the thin film includes an ion beam method, an electron beam method, a physical vapor deposition method, a chemical vapor deposition method, a sputtering method, and the like, and any of these methods can be used.

The packaging film according to the present invention comprises:
A heat-sealing film is laminated on a surface on the inner surface side of the packaging bag 1.

In this method, the packaging bag 1 itself is formed by imparting heat sealing properties to the surface on the inner surface side of the packaging bag 1, and the unsealing suppressing portion 5 is formed using the heat sealing film. It is for. As the heat sealing method, a commonly used dry lamination, melt extrusion coating, sandwich lamination in which an adhesive resin layer is formed by extrusion coating, or the like can be applied.

Examples of the heat-sealing resin for forming the heat-sealing film include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic ester copolymer, ionomer, Polybutene or the like can be used, and these are laminated by the above-mentioned method to form a heat-sealing film. In particular, resins having stable heat sealing properties and content resistance (eg, stress cracking resistance to surfactants) include linear polyethylene, ionomers, and ethylene / vinyl acetate copolymers having excellent low temperature heat sealing properties. Can be mentioned. In addition, as a material that easily gives the packaging bag self-sustainability, an ethylene / vinyl acetate copolymer can be used.

(2) Opening Start Section 4 Next, the opening start section will be described.

The opening start portion 4 of the packaging bag 1 of the present invention shown in FIG. 1 is provided for facilitating the opening of the packaging bag. Even at the notch opening start portion formed by making a cut in the mold, even at the opening start area where laser processing or abrasive grains are provided with, for example, a line or a dot on the whole or a part of the back seal portion 3, and These combinations may be provided. By providing such an opening start portion, initial opening can be facilitated.

The position where the opening start portion 4 is provided is provided. In the present invention, the opening start portion 4 can be provided at any position on the packaging bag. However, in a normal packaging bag, about 1/5 of the entire length of the packaging bag (hereinafter referred to as the upper portion of the packaging bag) is often opened from the upper end of the opening bag. Is preferably provided. Further, when the packaging bag is a gusset bag or a pillow bag, it is preferable to provide the packaging film on the back seal part 3 formed by attaching the packaging film to the palm, and the opening start part 4 is easily visible from the unsealing person. As described above, it is also possible to provide a guide by printing.

(3) Unsealing Suppression Unit 5 Next, the unsealing suppression unit 5 will be described.

The packaging bag 1 of the present invention prevents the opening 6 from going around the packaging bag 1 when opened from the opening start portion 4 and heats the package 1 to control the size of the opening. It is characterized in that an unsealing suppressing section 5 by a seal is provided.

First, a heat sealing method for forming the unsealing suppressing portion 5 is described. However, the present invention is not particularly limited to the heat sealing method, and a generally used heat sealing method can be used. . Further, the unsealing suppressing portion 5 can be formed at the same time when the packaging bag itself of the present invention is formed, that is, when the lower sealing portion and the back seal portion of the packaging bag are heat-sealed. It is also possible to form the packaging bag at the same time that the upper part of the packaging bag is finally heat-sealed and closed after filling.

The position where the unsealing suppressing portion 5 is provided is not particularly limited in the present invention, and may be provided anywhere in the packaging bag. However,
It is necessary to provide the unsealing suppressing part 5 on the extension of the unsealing opening 6 when the unsealing is started from the unsealing start part 4.

For example, as shown in FIG. 1, when the opening start part 4 is formed by making a V-shaped cut in the upper part of the back seal part 3 of the packaging bag 1, the extension of the opening is taken into consideration. From the upper end of the packaging bag 1
It is necessary to form the unsealing suppressing portions 5, 5 at the same position as the distance to. In this case, the length of the opening suppression portion is generally preferably about 1 to 5 cm. Also, as shown in FIG. 2 (a), the entire back seal portion 21 of the packaging bag is scratched by laser processing or abrasive grains so that the back seal portion 21 is provided.
In the case where an unsealing start area is formed so that the unsealing can be performed from any location, it is preferable to form the unsealing suppressing portions 22 on both ends of the packaging bag.

Next, regarding the shape of the unsealing suppressing portion by heat sealing, the shape is not particularly limited in the present invention. For example, it is also possible to form a rectangle as shown in FIG. 1 and a linear shape in the vertical direction as shown in FIG.

Further, as shown in FIG. 2B, it is also possible to form such that the reopening suppressing portions k, k are provided at the upper end and the lower end of the rectangular opening suppressing portion T. In the case where the opening suppression portion is a surface perpendicular to the opening direction, such as a rectangle as shown in FIG. 1, or a convex figure, after the opening is once suppressed by the opening suppression portion at the time of opening, If the unsealing person applies further excessive force, it may run down or upward again along the edge of the unsealing restraint part, and may not be able to restrain the unsealing. However, once the unsealing restraint part k is provided, the unsealing is suppressed. It is possible to prevent reopening (escape of the opening) after stopping at the suppression unit.

In FIG. 2B, the reopening suppressing portion k is in contact with the upper and lower ends of the rectangular opening suppressing portion T at right angles, and the entire opening suppressing portion has a "U-shape". However, the present invention is not necessarily limited to such a shape, and it is also possible to form such that the angle θ formed by the reopening suppressing portion k and the opening suppressing portion T is 90 degrees or more. Instead of forming the suppressing portion T, it is also possible to form a “U-shaped” opening suppressing portion in which a concave surface is formed toward the opening start portion only by the reopening suppressing portion k.

That is, when the opening of the packaging film serving as an opening is started from the opening start portion 4 and the cut of the packaging film is propagated toward the lateral end portion of the packaging bag, a figure surrounding the propagated cut may be formed. . As another example, (, <, etc. or a modification thereof may be used. Also, a figure such as a wavy line or a zigzag pattern having irregularities alternately with respect to the opening direction may be continuously formed in the vertical direction. This is because even if the cut hits the convex portion and escapes either up or down, it is caught in the adjacent concave shape and further opening does not proceed.

The present invention is not particularly limited with respect to the above-mentioned width of the unsealing suppressing portion (reference numeral w shown in FIG. 1). However, it is preferably from 4 mm to 12 mm, particularly preferably from 5 mm to 7 mm. Normally, a width of 4 mm or more is required to withstand the force applied to the bag when the package is opened by a person, and if the width for heat sealing is smaller than 4 mm, the heat seal is easily peeled off when opening. This is because the opening may not be able to be suppressed. In addition, from the effect of suppressing opening, 1
This is because it is not necessary to form the opening suppression portion exceeding 2 mm, and even if the opening suppression portion is formed beyond 12 mm, there are disadvantages such as a narrow opening opening and a decrease in the design of the bag. .

FIG. 3 is a perspective view showing a case where the packaging bag of the present invention is a gusset bag. In the case where the gusset bag is formed using the above-described packaging film, by forming the heat-sealable film surface to be the inner surface of the gusset bag, the heat-sealing layers are formed at the folded portion of the gusset bag 30. Since they face each other, it is easy to form the unsealing suppressing portion, which is suitable for implementing the present invention.

Here, when forming the unsealing suppression portion in the gusset bag 30, the shape and the like are not particularly limited as described above, and may be any shape. As shown in FIG. 3, it is also possible to form the unsealing suppressing portion 32 so as to be connected to the heat sealing portion 31 for closing the upper end of the gusset bag.

The present invention can be applied to the pillow bag shown in FIG.

FIG. 4 (a) is a rear view of the pillow bag of the present invention, and FIG. 4 (b) is a bb sectional view. Pillow bag 4
1 has the same basic structure as that of the gusset bag (see FIG. 1), and is formed by a packaging film 42, and the pillow bag 41 is formed by attaching the packaging film to the back of the pillow bag. It has a back seal part 43,
The back seal portion 43 is provided with an opening start portion 44 which is a trigger for opening when the opening is performed. And pillow bag 4
At both ends of 1, opening suppression portions 45, 45 are formed at positions similar to the distance from the upper end of the pillow bag to the opening start portion 44.

Here, in the gusset bag, the folded portion on the back side is used when forming the unsealing suppressing portion.
The pillow bag is characterized in that the opening start portion is formed by heat sealing the front surface and the back surface (see the enlarged view of FIG. 4B). Packaging film 42, back seal 43, opening start part 4 in pillow bag of the present invention
4. Since the structure of the unsealing suppressing portion 45 is the same as that of the gusset bag described above, detailed description thereof will be omitted.

The pillow bag is often used as this type of packaging bag along with the gusset bag. By applying the present invention to the pillow bag, it is possible to greatly expand the range of use.

Further, in the unsealing suppressing portion 32 shown in FIG. 3, an example is shown in which the unsealing suppressing portion 32 is formed in the folded portion on the back side. However, the present invention is not limited to this, and may be necessary. For example, it may be formed in a folded portion on the front side. When only the front-side folded portion and the front are heat-sealed (not shown), the front portion functions like a hinge, and the opening property is further improved.

[0042]

An embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 5, a packaging film 50 of the present embodiment has a biaxially stretched polypropylene film 51 having a thickness of 20 μm and a biaxially oriented polypropylene film 51 having a thickness of 12 μm on which aluminum is deposited.
An axially stretched polyethylene terephthalate film 52 and a transversely uniaxially stretched high-density polyethylene film 18 μm thick (trade name: Karariyan Y, manufactured by Toyo Chemical Co., Ltd.) 53
Then, an ethylene / vinyl acetate copolymer 54 having a thickness of 30 μm as a heat-sealing film was prepared by ordinary dry lamination using a polyester and isocyanate-based two-part curable adhesive.

Then, using the packaging film 50 described above,
The packaging bag 1 shown in FIG. 1 was formed and opened. The size of each part of the packaging bag 1 is as follows.

The total length of the packaging bag 1 is 26 cm and the total width is 15 cm. The total length of the unsealing suppressing portion is 1.2 cm and the width is 0.5 cm.

When the above-mentioned packaging bag 1 was opened, the opening was horizontal and straight, and the size of the opening could be controlled by the opening suppressing portion, thereby achieving the object of the present invention. Was.

[0047]

According to the present invention, by forming a film layer that is uniaxially stretched in a horizontal direction in a packaging film forming a packaging bag, the opening can be made straight when the bag is opened. By forming the unsealing suppressing portions at both ends of the portion, the unsealing opening stops at the unsealing suppressing portion at the time of opening, so that the unsealing opening does not go around the packaging bag. This is convenient even when preserving, and also when closing again because the upper end of the packaging bag is not completely opened, without damaging the decoration or the like provided on the front face or the like.

[Brief description of the drawings]

FIG. 1 (a) is a rear view of a packaging bag (gusset bag) of the present invention, and FIG. 1 (b) is a sectional view taken along aa.

FIG. 2 (a) is a rear view of a packaging bag (gusset bag) of the present invention, and FIG. 2 (b) is an enlarged view of a rear upper portion of the packaging bag of the present invention.

FIG. 3 is a perspective view of the gusset bag of the present invention.

FIG. 4 (a) is a rear view of the pillow bag of the present invention,
(B) is bb sectional drawing of the pillow bag of this invention.

FIG. 5 is a diagram showing a layer structure of a packaging film used for the packaging bag of the present invention.

[Explanation of symbols]

 1, 30 ... gusset bag, 2, 42, 50 ... packaging film, 3, 21, 43 ... back seal part, 4, 44 ... opening start part, 5, 22, 32, 45 ... opening suppression part, 6 ... opening mouth , 40 ... Pillow bag.

Continued on the front page F-term (reference) 3E064 AA09 AA13 BA17 BA26 BA29 BA30 BA35 BA36 BA38 BA40 BA46 BA54 BA60 BB03 BC18 EA05 FA01 GA02 HA06 HB05 HF09 HG03 HP01 HP05 3E067 AA05 AB23 BA12A BB14A BB15A BB16 EB18 BB16ABB EB18

Claims (3)

[Claims] 1. A packaging bag using a multilayer packaging film, wherein the packaging film is formed by laminating at least a horizontally uniaxially stretched film layer and laminating a heat-sealing film on the inner surface side of the packaging bag. The packaging bag is a packaging bag made by heat-sealing the heat-sealable films to each other. In the packaging bag, the packaging film is formed by attaching the packaging film on the back of the bag. A back seal portion is provided, having an opening start portion on the back seal portion, the heat sealable film at both ends which is an extension of a portion serving as an opening when opened by the opening start portion. A packaging bag, wherein a heat-sealed opening suppression portion is formed. 2. The packaging bag is a gusset bag, and the unsealing suppressing portion is formed by heat-sealing a back side folded portion and a back surface of a folded portion formed on a side surface of the gusset bag. The packaging bag according to claim 1, wherein 3. The packaging bag according to claim 1, wherein the packaging bag is a pillow bag, and the unsealing suppressing portion is formed by heat sealing the front and back surfaces of the pillow bag.