JP2000264348A - Unsealing structure of packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convenient opening or closing structure of a packaging bag which can be easily sealed or opened between a lid of a packaging bag and a main body of the bag. SOLUTION: There is provided a packaging bag comprised of a main body 8 of the packaging bag, a lid upper end 10 and a lid lower end 9. There are provided a small hole at the upper end of the lid, a first folding-back line for primarily folding back the upper end 10 of the lid toward the lid lower end 9, an adhesive agent 2 at the lid lower end 9 where substantially equal distance spaced apart from the small hole in an opposite direction of the small hole from the first folding-back line, and a proper second folding-back line 4 for use in secondary folding-back the lid composed of the upper end and the lower end toward the bag main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple openable and closable structure for freely closing and opening a lid and a main body of a packaging bag. ADVANTAGE OF THE INVENTION According to the opening and closing structure of this invention, the peeling and adhesion | attachment to the main body of the cover of a packaging bag with a simple structure are easy to use repeatedly.

[0002]

2. Description of the Related Art Conventionally, it is well known to seal a bag using a double-sided adhesive tape or a simple seal. An adhesive layer is provided, and a release sheet is integrated on each of the front and back surfaces of the pressure-sensitive adhesive layer.When used, the release sheets on the front and back surfaces are peeled off and interposed between both members to be bonded. Such a sealing means is frequently used for packaging or packing of food, clothing, household goods and the like, and there is a high demand for a double-sided adhesive tape or a simple sealing used therefor. Something has been devised.

[0003] As an example of a representative publication technique according to the present invention, a double-sided adhesive small piece is further adhered to a smooth surface of a base material having an adhesive on the back surface so that the bag can be opened and closed freely (actually open). No. 47-37400), a non-adhesive part is partially provided on the surface to make it easy to peel off the release sheet (Japanese Utility Model Application Laid-Open No. 51-107849), and there is a difference in the adhesive strength between the front and back adhesives. (Japanese Utility Model Laid-Open No. 55-64542,
Japanese Utility Model Laid-Open No. 57-102538, Utility model registration 3
No. 035401), air vent holes are provided to enable smooth adhesion (Japanese Utility Model Application Laid-Open No. 62-93345), sealing paper coated with an adhesive is folded in two, and the bag inlet is sandwiched, and the entrance side of the bag is inserted. And a simple seal material (Japanese Utility Model Laid-Open No. 1-96850) for adhering an adhesive through a hole provided in the same. More recently, a double-sealing function has been developed in which the sealing paper coated with the adhesive is folded in two, the entrance of the bag is sandwiched, the adhesives are adhered to each other through a hole provided on the entrance side of the bag, and a chuck is attached. (JP-A-3-25684
No. 9), an adhesive member in which a heat-fusible layer is laminated to a pressure-sensitive adhesive laminated on a plastic film via a material film that breaks with a weak force is heat-sealed to both sides of the opening, and can be resealed. (Japanese Unexamined Patent Publication No. Hei. 8-12947), in which two kinds of adhesives which do not have an adhesive function by themselves but generate an adhesive function when they come into contact with each other are provided on both sides of a pair of openings of a bag body. A bag-like container (Japanese Patent Laid-Open Publication No. Hei 10-147351) in which dust does not adhere to the adhesive surface and does not require a protective sheet; Is a bag body in which an adhesive portion and a peeling piece are arranged, and a perforation is formed above the opening, which conceals wrinkles and spots generated at a bonding portion (Japanese Utility Model Registration No. 3049247).
No.) and a device in which the opening is wound around a core and the air in the bag is discharged (U.S. Pat. No. 3,050,730). Further, as an excellent adhesive seal for opening, there is Japanese Patent Application Laid-Open No. Hei 10-298516 as a recent technology. However, a peeling sheet and an adhesive substrate sheet having an adhesive on both sides are partially used. An adhesive sheet having a laminated structure consisting of a punched cover sheet and a release sheet that have become voids is disclosed,
Attention has been paid to a simple and inexpensive adhesive seal that is suitable for temporarily fixing the lid of a packaging bag and can be used repeatedly. As described above, technical improvements relating to the pressure-sensitive adhesive seal for opening the packaging bag are being actively carried out in a wide variety of fields, and various types of pressure-sensitive adhesive seals for opening which are easy to use, have excellent adhesiveness and high functionality have been proposed. In fact, it is used in packaging bags for various kinds of products.

[0004]

However, the prior art using the above-mentioned adhesive seal generally has a relatively complicated structure, lacks simplicity, and further has an adhesive seal portion. In addition, it was difficult to confirm and identify the contents of the package, the peeling was troublesome, and it could not be said that it was manufactured at a low cost, which was not always satisfactory. Therefore, the present invention has previously filed Japanese Patent Application No. 10-368609 as a simple and inexpensive adhesive seal for opening a bag, which is easy to use with a simple structure, has high repetition continuity, and is simple and inexpensive. Instead, it is an object to pursue economics and simplicity by providing a simpler opening and closing structure. Further, it is necessary to realize a simple and inexpensive packaging bag opening / closing structure which is easy to use with a simple structure, has high repetition continuity, and is simple and more inexpensive only by using an adhesive without using an adhesive seal. And

[0005]

The bag opening / closing structure of the present invention is convenient because it can be sealed simply by manually pressing the area of the bag lid where the adhesive is placed, and can be opened simply by peeling off the adhesive portion with a fingertip. Extremely high. The opening / closing structure of the present invention is characterized in that the basic structure of the opening / closing operation is based on the use of only an adhesive, which is combined with the folding back of the lid of the bag body. That is, in the present invention, a small hole is provided at the upper and lower portions of the substantially upper half of the lid of the packaging bag body, that is, at a position above the folding line of the cover, and an adhesive is provided at a position below the small hole, and the small hole and the adhesive are provided. In the middle of the lid, that is, the approximate center of the upper half of the lid is primarily folded so as to conform the agent in a plane, and the primary folded portion, that is, the substantially boundary line between the lid and the bag body, is secondarily folded back. The lid is temporarily attached to the bag body, and although the structure is extremely simple, the bag body and the lid are firmly fixed at the time of sealing, and the temporary attachment area can be easily peeled off at the time of opening. Such an operation of sealing and opening can be continued as long as the adhesive force of the adhesive is maintained. The position of the return line is not particularly limited as long as it is located at the position of the lid of the packaging bag. In particular, the secondary return line can be provided appropriately.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the opening / closing structure of the present invention, a small hole having an arbitrary shape and number is provided at the upper end of a lid of a packaging bag. The upper end of the small hole may leave a margin of about 3 to 5 mm from the tip. Further, a first fold line for primary fold of the upper end of the lid is provided below the lower end of the small hole, which is substantially the same distance from the lower end of the small hole. Next, an adhesive is applied below the first folding line. The pressure-sensitive adhesive is applied to a position corresponding to the small hole when primary folding is performed with the first folding line as a base line. In order to protect the adhesive strength of the adhesive, a release tape is placed thereon. The adhesive may be applied to the folded portion directly in a strip shape or in a piecewise manner, or a double-sided adhesive tape slightly wider than the small hole and a release tape on one side may be used. You may peel off and use it. In addition, a hot melt adhesive that can be repeatedly used can also be used. Then, the release tape is peeled off in a timely manner, and the first folded line is used as a base line so that the adhesive is aligned with the small holes (more precisely, the adhesive portion is slightly wider). Fold the top of the lid so that it sticks to the bottom of the lid. At this time, if both lateral ends of the folded portion at the upper end of the lid are bonded to the respective ends of the folded portion, the primary folded portion will be firmly folded without warping. In order to protect the adhesive exposed on the outer surface through the small holes, a release tape is used.
Use As this release tape, a new release tape may be used, but it is economical to reuse the release tape peeled off before the primary folding.

Further, after the product is sealed in the packaging bag, it is necessary to fold the primary folded portion of the lid back to the bag body. The folding habit for the second folding is not constant because the size of the product is variously varied, such as food such as confectionery, clothing such as shirts, knit shirts, and setters. Since it is difficult to provide a folded line that just fits, the primary folded portion may be folded according to the size of the product. However, it does not prevent the provision of a secondary folded line that is a folding habit. In addition,
When the second folded line is provided, it is preferable that a habit is provided near the substantially upper end portion of the bag body (that is, the boundary between the bag body and the lid). The packaging bag of the present invention is put on the distribution route and stored in the state after the primary folding (the state of FIGS. 4 and 5 described later). Next, before and after filling the contents, the release sheet covering the adhesive is peeled off, and the primary folded portion is secondary folded so that the bag body side and the secondary folded portion are exposed to the small holes. Temporarily attach with an agent and seal. At this time, it is also possible to make a turn using the appropriately provided second turn line as a base line. When taking out the contents after the secondary folding, the secondary folded portion is returned to the state before the folding, and the opening of the bag body is opened to take out the contents. When closing the bag body opening again, the secondary folded portion may be folded back by an appropriate second folding line. Sealing and unsealing can be repeated and repeated as long as the adhesive force of the adhesive is maintained by repeating the above operation.

In the present invention, as the number of small holes provided in the packaging bag increases, the fixing function increases, but the number of small holes increases. Therefore, it is usually sufficient to provide two or three small holes. . In addition, the size of the small holes may be appropriately determined, but is suitably about 0.5 to 2 cm in relation to the temporary adhesion force. Further, the shape of the hole, the planar shape, a circular, a suitable polygon such as a triangle or a square can be freely selected, for example, a star, a pentagon,
If it is octagonal or star-shaped, it will be beautiful when stored. The material of the packaging bag body of the present invention is not limited, such as synthetic resin material and paper, and examples thereof include resin films such as polyethylene, polypropylene, polyvinyl chloride, polyvinyl acetate, and polyamide. As the pressure-sensitive adhesive, use of a normal pressure-sensitive adhesive is sufficient, but a pressure-sensitive adhesive that is resistant to repeated use of adhesion and peeling is preferable. For example, main ingredients such as polyisobutylene, polyvinyl ether, synthetic rubber, and polyacrylate, adhesive aids such as ester gum, hydrogenated rosin, and coumarone resin; and plasticizers such as phthalate, chloride paraffin, and castor oil. It is suitably composed of three components with an agent. Of these three components, those having good compatibility are appropriately combined, dissolved in a solvent, applied to a base sheet and dried. An example of the composition of the adhesive is as follows. A mixture of 40 parts of polyvinyl isobutyl ether, 10 parts of rosin, and 50 parts of benzene is mixed with a solvent benzo-
And 25 parts. Further, a hot melt adhesive can be used. In this case, a synthetic rubber hot melt adhesive composed of a synthetic rubber, a petroleum resin, a plasticizer, and the like, which can be used for a long period of time and has a long durability, is used. Is preferred.

Although there is no particular limitation on the amount of the adhesive applied,
What is necessary is just to set it as about 10-30 micrometers. The area of the pressure-sensitive adhesive when using the pressure-sensitive adhesive or tape needs to be slightly larger than the area of the small hole. However, considering the error at the time of folding, for example, the case of a circular small hole is considered. The diameter is preferably about 1 to 2 cm. On the other hand, the width of the peeling tape may be at least larger than the area of the small hole where the adhesive is exposed, but an appropriate one may be used in consideration of economy. The material of the release tape is not particularly limited as long as the release property is good, but it may be transparent or opaque, and a plastic film such as polypropylene or polyester, cellophane or paper is used. Preferably, the surface of the tape is treated with a release agent by coating with silicon or the like.
Either a transparent tape or an opaque tape can be used for the release tape. If a printed pattern or a printed mark is applied to the front or back surface of any of them, the release tape can be used when the bag body is stored. Since the printed pattern and the printed mark can be seen through from the outside of the tape, the aesthetic appearance can be enhanced by, for example, a decorative pattern, and the character pattern can be expressed.
Since the printed pattern and the like are printed on the adhesive side of the release tape, the printed pattern and the like do not stain or peel off during use.

Hereinafter, the present invention will be described with reference to the drawings as an embodiment, but the configuration of the present invention is not limited to this embodiment. FIG. 1 is a diagram showing a state in which a bag folded portion of the packaging bag of the present invention is temporarily attached to a bag body, FIG. 2 is a diagram showing a state in which an adhesive and a release tape are arranged in the bag folded portion.
FIG. 3 is a plan view of the state of FIG. 2 (in the case of a transparent bag), and FIG.
Is a state diagram after the primary folding of the portion of FIG. 2, and FIG. 5 is a plan view (in the case of a transparent bag) of the state of FIG. In the figure, 1 is a release tape, 2 is an adhesive, 3 is a first folded line, 4 is a second folded line, 5 is a lid, 6 is a printed pattern provided on the release tape, 7 is a small hole, 8 is a packaging bag body, 9 is a lower end of a lid,
Reference numeral 10 denotes an upper end portion of the lid, and 11 denotes a lateral end portion of the primary turn.
As shown in FIG. 2, the packaging bag of the present invention has a bag body 8.
In addition, the lid 5 includes a lid lower end 9 and a lid upper end 10. First, an appropriately shaped small hole 7 is formed in the upper end portion 10 of the lid.
Are provided in an appropriate number. The adhesive 2 is applied in a direction opposite to the small holes (downward in the drawing) and away from the small holes by a first folding line 3 for folding the upper end portion 9 of the lid, at a distance substantially equal to the small holes. The application area of the pressure-sensitive adhesive 2 is slightly larger than the area of the small hole 7 as shown in FIG. 3 in consideration of the folding error at the time of primary folding. At this time, an adhesive tape may be used instead of the adhesive. It is preferable to protect the pressure-sensitive adhesive 2 by applying a release tape 1 having a larger area than the pressure-sensitive adhesive to the surface of the pressure-sensitive adhesive or the pressure-sensitive adhesive tape.
In addition, the folded state is more stable when both lateral ends 11, 11 of the folded portion are bonded to the lateral ends of the lid lower end 9 at the folded destination by a heat seal.

Next, the adhesive tape is peeled off and the upper end 10 of the lid is removed.
With the first fold line 3 as a base line, the small hole 7 is folded back toward the bag body side (clockwise in the drawing) by the adhesive area 2 so as to be entirely covered (primary fold). FIG.
Since the pressure-sensitive adhesive area is exposed to the outside through the small hole after the primary folding, the release tape is used to protect this.
7 shows a state in which the loop 11 is attached. In FIG. 5, adhesive area 2
Indicates that the small hole is accurately covered, and this state shows the state before the use of the packaging bag, and the packaging bag is put on the distribution channel and stored as it is. When it is necessary to close the opening of the bag after packing the desired product in the packaging bag, the release tape 11 shown in FIG.
Is secondarily folded toward the bag body 8 (clockwise in the drawing) with the appropriately provided second folding line 4 as a base line.
By strongly pressing from the outside to the inside (from right to left in FIG. 1) of the lid lower end 9 corresponding to the adhesive exposed from the small hole, the bag lid adheres to the bag body as shown in FIG. It will be temporarily attached by force.

[0012]

The opening and closing structure of the packaging bag of the present invention is used for packaging bags for packaging and selling foods such as confectionery, clothing such as shirts, and daily miscellaneous goods such as books. Used as a simple structure. Further, the opening / closing structure of the packaging bag of the present invention is easy to use with a simple structure, exhibits a strong opening / closing force, has high repetitive continuous use of easy peeling / easy adhesion, can be used easily, and is economically advantageous. Social contribution is high. Further, if a printed pattern or a printed mark is applied to the peeling tape, there is an advantage that the contents of the package can be easily confirmed and identified.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which an opening of a packaging bag is closed according to the present invention.

FIG. 2 is a cross-sectional view of a bag body and a lid before primary folding according to the present invention.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a cross-sectional view of the bag body and the lid after the primary folding according to the present invention.

FIG. 5 is a plan view of FIG. 4;

[Explanation of symbols]

 1; peeling tape 2; adhesive 3; first folded line 4; second folded line 5; lid of bag body 6; printed pattern 7; small hole 8; bag body 9; Upper end 11; Side end

Claims (8)

[Claims] An openable and closable structure of a packaging bag having the following structure. a. A packaging bag comprising a packaging bag body, a lid upper end and a lid lower end, b. A small hole in the upper end of the lid, c. A first folding line for temporarily turning the upper end of the lid toward the lower end of the lid; d. An adhesive at a lower end portion of the lid, which is away from the first turn-back line by a distance substantially equal to the small hole in a direction opposite to the small hole; e. An appropriate second folding line for secondary folding the lid consisting of the upper end and the lower end toward the bag body. 2. The opening / closing structure of a packaging bag according to claim 1, wherein the packaging bag is made of synthetic resin or paper. 3. The packaging bag opening and closing structure according to claim 1, wherein the small hole at the upper end of the bag body is a plurality of circles, triangles, squares, stars, or an arbitrary polygon. 4. The packaging bag according to claim 1, wherein the pressure-sensitive adhesive is coated with an adhesive, or a hot-melt adhesive or an adhesive tape is disposed thereon. Opening and closing structure. 5. The packaging bag opening / closing structure according to claim 1, wherein the adhesive is protected by a release tape. 6. The packaging bag according to claim 1, wherein the release tape is transparent or opaque, and has a printed pattern or a printed mark on the front or back surface. Construction. 7. The adhesive tape according to claim 1, wherein a peeling tape for temporarily protecting the pressure-sensitive adhesive exposed on the outer surface through the small hole is attached. Opening and closing structure of packaging bag. 8. The opening / closing structure for a packaging bag according to claim 1, wherein both lateral ends of the folded portion at the upper end of the lid after the primary folding are adhered.