JP2003011989A - Packaging bag for desiccant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high permeability while having a plastic film structure, and to be able to arbitrarily set the permeability, and to form a breathable film made of a plastic film excellent in strength. It is an object of the present invention to provide a desiccant packaging bag having: SOLUTION: This is a quadrangular bag made of a plastic film and formed by a heat bonding portion, wherein a plurality of small holes or cuts are formed in a predetermined region of the plastic film,
A desiccant packaging bag having a configuration in which a heat-adhesive air-permeable base material is heat-bonded to the inner surface of a plastic film so as to cover the entire plurality of formed small holes or cuts.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has a high breathability even though it has a plastic film structure.
Further, the present invention relates to a packaging bag for packaging a desiccant or the like, which is mainly made of lime, and whose air permeability can be arbitrarily adjusted.

[0002]

2. Description of the Related Art In a lime desiccant utilizing the hydration reaction of quick lime, when the quick lime absorbs moisture, it becomes fine powdery slaked lime having a wide particle size distribution of about 0.01 to 100 .mu.m. Etc.) is known. In order to obtain air permeability and moisture permeability without passing through this pulverized slaked lime, paper materials have been conventionally used in many cases. In addition, an automatic filling and packaging machine is used for mass production, and pouch manufacturing uses this packaging machine to perform heat sealing by heat and pressure, which requires an inexpensive polyethylene resin layer as this heat sealing material. However, since polyethylene resin does not have breathability and moisture permeability as a desiccant, for example,
As shown in JP-B-56-52909 and JP-B-58-45346, a laminated film having a heat seal layer and a laminate layer penetrated without penetrating a paper layer has been used. Further, since the perforated polyethylene laminated paper was easily torn, from the viewpoint of consumer protection, a reinforced perforated polyethylene laminated paper whose strength is reinforced with a split cloth or a cloth so as not to tear is used. Became. In addition, if water is accidentally dipped in water, the water will suddenly invade through the holes and will react with quicklime to cause heat generation. It was decided to use it as a paper layer.

In the case of using the above-mentioned paper layers such as water resistant paper and oil resistant paper, the Ink Industry Association voluntarily regulated that "it is better to avoid direct contact of printing ink with food" revised in 1993. If you print on the inner side of the packaging bag so as to satisfy the above, there is a problem that the displayed text is difficult to see and it is not readable especially with oil-resistant paper. There is also a problem in that consumer complaints such as mold-like appearance occur due to the lumps of food sticking to food.

As described above, water vapor molecules are allowed to pass without passing through water molecules so that heat is not generated even when soaked in water, and the paper has strength that does not break by hand and does not break through. There is a need to develop a packaging material for lime desiccants that is clearly readable even when applied, is hygienic without paper dust, and has the desired breathability and moisture permeability. Therefore, as described in Japanese Patent Laid-Open No. 2000-43949, it is necessary to satisfy the above conditions.
A moisture permeable film such as nylon having a structure in which a printed layer is formed on the inner surface of a moisture permeable film such as nylon and an ethylene-vinyl acetate copolymer layer having a vinyl acetate content of 6 to 30 wt% is laminated on the printed surface. A printed layer is formed on the inner surface of ethylene, and the vinyl acetate content on the printed surface is 6-30% by weight of ethylene-
A structure in which a lattice network reinforcing material layer such as polyethylene cloth is laminated with a vinyl acetate copolymer layer, and an ethylene-vinyl acetate copolymer layer having a vinyl acetate content of 6 to 30% by weight is laminated on the lattice network reinforcing material layer surface. A packaging material for a desiccant composed of a plastic film is known.

However, in the case of the desiccant packaging bag having the above structure, the nylon film and the vinyl acetate content are 6%.
Since the water vapor permeability of the ethylene-vinyl acetate copolymer layer of up to 30% by weight is relatively large, it is suitable for use as an ordinary desiccant bag, but it is dried for use in a specific application. When it is attempted to further increase the moisture permeability of the agent packaging bag, the thickness of the nylon film is reduced, or the thickness of the ethylene-vinyl acetate copolymer layer having a vinyl acetate content of 6 to 30% by weight is reduced. Although it is necessary, when the thickness of the nylon film and the thickness of the ethylene-vinyl acetate copolymer layer are made thin, the processability becomes poor, and the pinhole resistance also decreases, and the thermal adhesive strength of the laminated film Also, since the adhesive strength between the layers of the laminated film is also reduced, the laminated film is peeled off or the heat-bonded portion is broken, so that the strength is weak, and there is a possibility that the desiccant contained inside may leak out. Have There.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plastic film which, while having a plastic film structure, has high air permeability and can be arbitrarily set with air permeability, and is excellent in strength. It is to provide a desiccant packaging bag consisting of.

[0007]

A square-shaped packaging bag made of a plastic film and formed by a heat-bonding portion, wherein a plurality of small holes or cuts are formed in a predetermined region of the plastic film and the small holes or By making the structure in which the breathable base material is heat-bonded to the inner surface of the plastic film so as to cover the entire cut, the internal visibility is good and the contents to be stored inside may leak out from the small holes or cuts. Instead, simply changing the number and size of the small holes or cuts formed in the plastic film, or changing the material of the air permeable base material allows the air permeability required for the desiccant packaging bag to be changed according to the intended use. Can be changed.

In the desiccant packaging bag described above, the small holes or cuts are formed in a strip-shaped region parallel to one side of the packaging bag, and the breathable substrate is strip-shaped so as to cover the entire small holes or cuts. The heat-bonding configuration facilitates the work of forming a plurality of small holes or cuts in a continuous plastic film and covering the entire small holes or cuts to heat-bond the breathable substrate.

In the above-mentioned desiccant packaging bag, the breathable base material is heat-bonded to the plastic film at the peripheral portion, so that workability of the step of heat-bonding the breathable base material to the plastic film is improved. Is getting better,
It is possible to prevent the small holes or cuts formed in the plastic film from being blocked when the air-permeable substrate is heat-bonded to the plastic film.

In the above desiccant packaging bag, the breathable substrate is made of a porous film and is heat-bonded to the plastic film. The thermal adhesiveness in the bag making process for producing the packaging bag is improved. Further, even when the desiccant or the like is made of lime and becomes fine powder when absorbing water, it can be formed so as not to pass through the breathable base material and come out to the outside.

In the above-mentioned desiccant packaging bag, the breathable substrate is made of a laminate of a porous film and a non-woven fabric or a reinforcing material layer and is heat-bonded to the plastic film, whereby the breathability is improved. Since the strength can be increased while maintaining the above, the elongation of the porous film can be suppressed, and the processing such as bag making and filling can be easily performed.

In the above desiccant packaging bag, the plastic film comprises a biaxially stretched plastic film and a low-density polyethylene laminate,
It is possible to obtain a transparent desiccant packaging bag which is superior in strength such as breakthrough to the desiccant packaging bag used conventionally.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along line I-I of FIG. 1, FIG. 3 is a plan view showing a second embodiment of the present invention, and FIG. II cross-sectional view, 2 is a side heat-bonded portion, 3 is a edge heat-bonded portion, 4, 4 '
Is a breathable base material heat-bonded portion, 5 is a small hole, 11 is a plastic film, and 12 is a heat-bondable breathable base material.

The first embodiment of the present invention is as shown in FIGS. In the plan view, as shown in FIG. 1, a square plastic film 11 is folded in two at a central portion, and a side edge heat-bonding portion 2 at a side edge facing the fold and a side edge heat-bonding portion 2 are formed.
A rectangular packaging bag in which upper and lower edge heat-bonding portions 3 orthogonal to each other are formed, and a plurality of small holes are formed in a plastic film 11 in a belt-like region in a direction parallel to the side heat-bonding portion 2. 5 is formed, and the heat-adhesive breathable base material 12 covers the whole of the plurality of small holes 5 formed in the strip-shaped region, and the heat-adhesive breathable base material 12 is provided on the inner surface of the plastic film. The heat-bonded base material 4 is heat-bonded and attached.

The cross-sectional shape of the portion where the thermoadhesive air-permeable base material 12 is adhered to the inner surface of the plastic film 11 so as to cover the entire small hole 5 is as shown in FIG. Regions that are heat-bonded to the inner surface of the plastic film 11 by the air-permeable base material heat-bonding portions 4 formed at both ends of the air-permeable base material 12 and sandwiched between the two air-permeable base material heat-bonding portions 4. Then, the plastic film 11 in which the small holes 5 are formed
The heat-adhesive and air-permeable base material 12 is not bonded. In the first embodiment, it is possible to prevent the small holes 5 formed in the plastic film 11 from being closed by heat-bonding the heat-adhesive breathable base material 12. Further, a band-shaped heat-adhesive breathable base material 12 is formed on the inner surface of the plastic film 11.
Since they are heat-bonded by the air-permeable base material heat-bonding parts 4 at both ends,
Since the area to be heat-bonded becomes small, the heat-bondable breathable base material 12 can be easily attached to the plastic film 11.

The second embodiment of the present invention is as shown in FIGS. 3 and 4, in which the heat-adhesive and air-permeable base material 12 covers the entire small holes 5 formed in the plastic film 11 and has a heat-adhesive property. The structure is basically the same as that of the first embodiment, except that the entire surface of the breathable base material 12 is thermally bonded to the plastic film 11. In the second embodiment, both sides of the heat-bondable air-permeable base material 12 may be heat-bonded in a solid shape and the central region may be heat-bonded in a spot shape.
The second embodiment is suitable for a case where a plurality of relatively large small holes 5 are formed in a relatively narrow region of the plastic film 11.

In the first and second embodiments, the shape of the bag is a three-way sealed bag, but it may be a four-way sealed bag and the shape of the bag is arbitrary. A plurality of small holes 5 are formed in a band-shaped region in a direction parallel to the side edge heat-bonding portion 2 facing the fold of the plastic film 11, and the plurality of small holes 5 are formed in the band-shaped region.
By covering the entire surface of the plastic film 11 with the band-shaped heat-adhesive breathable base material 12 on the inner surface of the plastic film 11, a plurality of small holes 5 are continuously formed in the continuous plastic film flow direction. In addition to the above, it is easy to attach the band-shaped heat-adhesive breathable base material 12 continuously by heat-adhesion so as to cover the entire plurality of continuous small holes 5 formed in the flow direction of the plastic film. This is preferable because it facilitates, but the area where the small holes 5 of the plastic film 11 are formed is set to an arbitrary size and an arbitrary position, and the small holes 5 formed are entirely covered with the heat-adhesive breathable base material 12. It may be attached by heat bonding.

With respect to the small holes 5, the size is 0.1 mm in diameter.
It is preferable to set it to about 4.0 mm, and the number to be formed can be arbitrarily determined so that the moisture permeability required for the desiccant bag can be obtained depending on the intended use. Small hole 5
As a method of forming the above, it can be formed by piercing with a hot needle, perforation by irradiation with carbon dioxide gas laser, or perforation by mechanical punching. When forming the small hole 5 having a relatively small diameter, piercing with a hot needle or perforation by irradiating a laser such as carbon dioxide gas is suitable. When the small hole 5 having a relatively large diameter is formed, mechanical punching using a die is suitable. In addition, in the first and second embodiments, the ventilation portion has a configuration in which a plurality of small holes 5 are formed, but a configuration in which a plurality of cuts are formed instead of the plurality of small holes 5 may be used. The cut shape has a length of 1 to 7 mm
It is preferable to arrange the individual cuts in a zigzag pattern as the linear and arc-shaped, and mechanical punching using a die is suitable for forming the linear and arc-shaped cuts, but at the time of manufacturing It is also possible to form a continuous cut in the direction of flow, that is, a cut extending between opposite ends of the bag, a so-called slit.

As the plastic film 11, biaxially stretched polyethylene terephthalate, biaxially stretched nylon, 2
A laminate of a base material layer made of a biaxially stretched film having excellent strength such as axially stretched polypropylene and a heat adhesive resin layer made of low density polyethylene such as linear low density polyethylene having excellent heat adhesiveness is used. Is preferred. As a specific laminated structure, biaxially stretched polyethylene terephthalate 12
μm / printing / linear low density polyethylene 30-80 μm,
Biaxially oriented nylon 15 μm / printing / linear low density polyethylene 30-80 μm Biaxially oriented polypropylene 20 μm
/ Printing / linear low-density polyethylene 30 to 80 μm.

As the heat-adhesive air-permeable base material 12, it is preferable to use a material which has heat-adhesiveness to the base material itself, can be heat-bonded to a plastic film, and is hard to pass fine powder. Porous film such as "Porum" manufactured by Tokuyama Co., Ltd., a laminate of a porous film and a reinforcing material such as a lattice mesh material such as a warif or a nonwoven fabric, and synthetic paper such as Tyvek manufactured by Asahi DuPont Co., Ltd., Further, it is also possible to use polyethylene or the like, which is laminated on both sides of paper, and has small holes that do not penetrate the paper formed on the polyethylene on both sides.
In particular, a porous film is suitable because it has air permeability, moisture permeability, water resistance, and the like and does not allow fine powder to pass through. In addition, since it is possible to increase the strength without changing the air permeability by using a laminate with a reinforcing material such as a lattice mesh material such as a warif or a non-woven fabric, it is possible to expand the porous film at the time of narrow-width cutting and filling and packaging. Therefore, the work stability and the flatness of the package (prevention of wrinkles due to shrinkage) can be improved. Further, it is also possible to use a base material which has no heat-adhesive property and whose surface is coated with a heat-sealing agent.

In order to produce the desiccant packaging bag of the embodiment, for example, a plastic film obtained by laminating a base material layer made of biaxially stretched nylon and a heat adhesive resin layer made of linear low density polyethylene is prepared, When slitting the laminated plastic film with a slitter to a predetermined width for making a desiccant packaging bag, in the plastic film, in a predetermined width region in the flow direction of the plastic film, mechanically using a mold. A plurality of small holes or cuts are continuously formed to form a plurality of small holes or cuts to form a plastic film having a predetermined width. On the other hand, a roll-shaped heat-bondable air-permeable base material is prepared by slitting the heat-bondable air-permeable base material into a predetermined width. In a machine that automatically fills and packages desiccant, set a plastic film of a predetermined width with a plurality of roll-shaped small holes or cuts and a heat-adhesive breathable base material of a roll of a predetermined width, and cut the small holes or cuts. After attaching the heat-adhesive breathable base material to the inner surface of the punched plastic film so as to cover the entire small holes or cuts, fold the plastic film in two in the flow direction, and For the desiccant by forming the edge heat-bonding part in the right angle direction, filling the inside with a desiccant, and then forming the side heat-bonding part at the side edge in the direction parallel to the folded plastic film and cutting. A packaging bag can be made.

The desiccant packaging bag of the present invention is produced by appropriately changing the size and number of the small holes or cuts formed in the plastic film and changing the material of the breathable substrate. It is possible to freely change the water vapor transmission rate of the plastic film to be used, and it is possible to manufacture a plastic film having a high water vapor transmission rate. Therefore, it has a feature that it can be made into a desiccant packaging bag suitable for the type, shape, etc. of the desiccant to be housed inside, and also suitable for the intended purpose and use of the desiccant. Although the present invention provides a desiccant packaging bag, it can also be used for packaging deoxidants, insect repellents, fragrances and the like in addition to desiccants.

[0023]

A square-shaped packaging bag made of a plastic film and formed by a heat-bonding portion, wherein a plurality of small holes or cuts are formed in a predetermined region of the plastic film and the small holes or cuts are entirely covered. By covering and covering the inner surface of the plastic film with the air-permeable base material, the internal visibility is good, and the contents stored inside do not leak out from the small holes or cuts. By changing the number and size of the small holes or cuts formed in the, or changing the material of the breathable base material, the breathability required for the desiccant packaging bag can be arbitrarily changed according to the intended use. it can.

In the above-mentioned desiccant packaging bag, small holes or cuts are formed in a band-shaped region parallel to one side of the packaging bag, and the breathable substrate is band-shaped so as to cover the entire small holes or cuts. The heat-bonding configuration facilitates the work of forming a plurality of small holes or cuts in a continuous plastic film and covering the entire small holes or cuts to heat-bond the breathable substrate.

In the above desiccant packaging bag, the breathable base material is heat-bonded to the plastic film at the peripheral portion, so that workability of the step of heat-bonding the breathable base material to the plastic film is improved. Is getting better,
It is possible to prevent the small holes or cuts formed in the plastic film from being blocked when the breathable base material is thermally bonded to the plastic film.

In the above desiccant packaging bag, the breathable substrate is made of a porous film and is heat-bonded to the plastic film. The thermal adhesiveness in the bag making process for producing the packaging bag is improved. Further, even when the desiccant or the like is made of lime and becomes fine powder when absorbing water, it can be formed so as not to pass through the breathable base material and come out to the outside.

In the above desiccant packaging bag, the breathable substrate is made of a laminate of a porous film and a non-woven fabric or a reinforcing material layer and is heat-bonded to the plastic film, whereby the breathability is improved. Since the strength can be increased while maintaining the above, the elongation of the porous film can be suppressed, and the processing such as bag making and filling can be easily performed.

In the above desiccant packaging bag, the plastic film comprises a biaxially stretched plastic film and a low-density polyethylene laminate,
It is possible to obtain a transparent desiccant packaging bag which is superior in strength such as breakthrough to the desiccant packaging bag used conventionally.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a plan view showing a second embodiment of the present invention.

4 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

2 Side heat-bonded part 3 Edge heat bonded part 4,4 'Breathable base material Thermal bonding part 5 small holes 11 plastic film 12 Thermal adhesive breathable substrate

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 81/26 B65D 81/26 Q (72) Inventor Shigeru Takeshita 2-16-36 Shimizu, Minami-ku, Fukuoka-shi, Fukuoka 9 Provincial Dai Nippon Printing Co., Ltd. (72) Inventor Yuji Honda 2-15-1, Shimizu, Minami-ku, Fukuoka City, Fukuoka Prefecture F-term in Dai Nippon Printing Co., Ltd. (reference) 3E064 AA03 BA27 BB03 BC18 EA30 HD02 HD07 HE03 3E067 AA05 AB96 BA12A BB14A BB25A BC04A CA03 CA24 EA08 EE19 FA02 FC01 GB02 GB03 GD10 3E086 AA23 AC07 AD01 BA04 BA15 BA19 BA33 BA43 BB02 BB51 BB62 BB85 CA29 4D052 AA09 BA10 BA02 BA10BA02 BA10BA02 BA10BA02BA10B02BA10BA02BA10BA02BA10B02BA10BA02BA10B02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA02BA10BA03BA01 DG15C EC03 EC032 EJ38A GB16 JD02 JD02B

Claims (6)

[Claims] 1. A quadrangular packaging bag made of a plastic film and formed by a heat-bonding part, wherein a plurality of small holes or cuts are formed in a predetermined region of the plastic film, and the entire small holes or cuts are formed. A desiccant packaging bag, characterized in that a breathable base material is heat-bonded to the inner surface of the plastic film so as to cover the plastic film. 2. The small hole or cut is formed in a band-shaped region parallel to one side of the packaging bag, and the breathable substrate is heat-bonded in a band shape so as to cover the whole small hole or cut. The packaging bag for a desiccant according to claim 1, wherein 3. The desiccant packaging bag according to claim 1, wherein the breathable base material is heat-bonded to the plastic film at a peripheral edge portion. 4. The desiccant packaging bag according to claim 1, wherein the breathable substrate is made of a porous film and is heat-bonded to the plastic film. 5. The breathable base material, which is made of a laminate of a porous film and a non-woven fabric or a reinforcing material layer, and is heat-bonded to the plastic film. The packaging bag for the desiccant described. 6. The desiccant packaging bag according to claim 1, wherein the plastic film comprises a laminate of a biaxially stretched plastic film and low density polyethylene.