JP7371360B2 - paper packaging - Google Patents

Description

The present invention relates to a paper package sealed by thermal adhesion of a thermally adhesive resin layer provided on a paper base material.

A package in which a thermal adhesive resin layer is provided on a paper base material is disclosed in Patent Document 1. In the laminate forming this package, an ink layer is formed on one side of a paper base material, and a heat-adhesive resin layer (sealant layer) is provided on the other side with a foam sheet interposed therebetween. By arranging the heat-adhesive resin layer on the inner surface and thermally bonding the opposing heat-adhesive resin layers, a package (packaging bag) with one end open is formed. The package is sealed by filling the contents and thermally bonding the opening.

JP2018-69460A (pages 4 to 8, Figure 2)

However, according to the above conventional packaging body, when confectionery such as candy or chocolate is packaged, sweet scent components released from the confectionery pass through the packaging body and are released to the outside. For this reason, the fragrance components may attract insect pests such as the white-spotted moth and the striped-spotted moth. Since the larvae of the Noshime moth and the striped moth have a high ability to penetrate, there is a risk that they may break through the package and enter, damaging the contents.

An object of the present invention is to provide a paper package that can prevent pests from damaging the contents.

In order to achieve the above object, the present invention includes a paper base material, a printing layer printed on one side of the paper base material, and a thermoadhesive resin layer arranged on the other side of the paper base material. In a paper package formed of a laminate and capable of being sealed by thermal adhesion of the opposing thermoadhesive resin layers, the printing layer or the thermoadhesive resin layer contains an adsorbent containing hydrophobic zeolite. It is characterized by

Further, the present invention is characterized in that the paper package having the above structure has a SiO ₂ /Al ₂ O ₃ molar ratio of the hydrophobic zeolite forming the adsorbent of 30 to 10,000.

Further, the present invention is characterized in that the paper package having the above structure is characterized in that the adsorbent is formed of hydrophobic zeolite supporting a chemical adsorbent.

The present invention is also characterized in that, in the paper package having the above structure, the adsorbent is contained in the thermoadhesive resin layer, and the thermoadhesive resin layer is formed of an extruded resin of the thermoadhesive resin. .

The present invention also provides a paper package having the above structure, wherein the adsorbent is contained in the thermoadhesive resin layer, and the thermoadhesive resin layer is a coating film formed by coating the paper base material with the thermoadhesive resin. It is characterized by consisting of.

The present invention also provides a paper package having the above structure, wherein the printing layer has an ink layer coated with printing ink and an OP varnish layer coated with varnish on the upper layer of the ink layer, Alternatively, the varnish contains the adsorbent.

Further, the present invention is characterized in that the paper package having the above structure is characterized in that the printing ink or the varnish containing the adsorbent is aqueous and does not contain alcohol.

Further, the present invention is characterized in that the laminate does not include a stretched film in the package having the above structure.

According to the present invention, a paper package can be sealed by thermal adhesion of a thermoadhesive resin layer, and an adsorbent containing hydrophobic zeolite is contained in the printed layer or the thermal adhesive resin layer disposed on the paper base material. be done. As a result, the sweet flavor components of confectionery are adsorbed by the hydrophobic zeolite, and are prevented from leaking outside from the paper package. Therefore, it is possible to prevent the contents from being harmed by pests that are attracted to the aroma components of confectionery.

A perspective view showing a paper package according to a first embodiment of the present invention A sectional view showing a wrapping paper forming a paper package according to a first embodiment of the present invention

<First embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of a paper package according to a first embodiment. The paper package 1 consists of a three-sided sealed bag having an opening 1a at the upper end, and is provided with a storage section 9 for storing contents therein. The contents stored in the storage section 9 consist of food products including sweets.

The paper package 1 is formed by thermally bonding three peripheral sides (both sides and the bottom) of a wrapping paper 20 (see FIG. 2) made of two laminates using a sealing part 3. A sheet of wrapping paper 20 may be folded and the two peripheral sides (both sides) may be thermally bonded using the sealing portion 3. The paper package 1 can be sealed by closing the opening 1a by thermal bonding.

FIG. 2 is a schematic cross-sectional view showing the layer structure of a wrapping paper 20 made of a laminate forming the paper package 1. As shown in FIG. In the wrapping paper 20, a printing layer 21 is arranged on one side of a paper base material 22, and a heat-adhesive resin layer 23 is arranged on the other side. Thereby, since the wrapping paper 20 does not include a stretched film, it is possible to reduce the amount of petroleum-derived materials and reduce the environmental load.

The paper base material 22 is not particularly limited, but includes high-quality paper, thin imitation paper, bleached kraft paper, unbleached kraft paper, single-gloss kraft paper, heavy-duty kraft paper, pure white roll paper, glassine paper, white paperboard, paper tube base paper, Liner base paper, recycled paper, etc. can be used. The paper base material 22 may be made of single-layer paper or multi-layer paper.

The paper base material 22 preferably has a basis weight of 45 to 150 g/m ² . If the basis weight of the paper base material 22 is smaller than 45 g/m ² , the wrapping paper 20 will be easily torn, and if it is larger than 150 g/m ² , it will be difficult to form it into a bag shape.

The printing layer 21 is printed on a paper base material 22 and includes an ink layer 21a and an OP (Over Printing) varnish layer 21b. The ink layer 21a consists of a coating film in which printing ink is applied onto the paper base material 22, and the OP varnish layer 21b consists of a coating film in which varnish is applied on the ink layer 21a. The ink layer 21a and the OP varnish layer 21b are provided on the entire surface of the paper base material 22. Incidentally, the ink layer 21a may be provided only on a portion where a pattern or the like is formed.

The ink forming the ink layer 21a is mainly composed of urethane resin, acrylic resin, nitrified cotton resin, etc., and contains cyan, magenta, yellow, and black colored pigments and a white pigment, respectively. The OP varnish layer 21b improves the abrasion resistance and heat resistance of the surface of the wrapping paper 20 by a varnish coating.

The amount of ink applied to the ink layer 21a can be, for example, 0.5 to 3 g/m ² . Further, the amount of varnish applied to the OP varnish layer 21b can be, for example, 0.5 to 3 g/m ² . In this embodiment, the amount of ink applied to the ink layer 21a is 1 g/m ² , and the amount of varnish applied to the OP varnish layer 21b is 1 g/m ² .

The thermoadhesive resin layer 23 is formed of extruded resin extruded onto the paper base material 22 . The seal portion 3 (see FIG. 1) is formed by overlapping the opposing thermoadhesive resin layers 23 and thermally adhering them by applying pressure and heating. Examples of the extruded resin forming the heat-adhesive resin layer 23 include polyethylene, polypropylene, and the like. In this embodiment, polyethylene (Novatec (registered trademark) LC600A) manufactured by Japan Polyethylene Co., Ltd. is used.

The thickness of the heat-adhesive resin layer 23 made of extruded resin is, for example, 15 to 60 μm. At this time, if the weight ratio of the paper base material 22 to the entire paper package 1 is set to 50% or more depending on the amount of the heat-adhesive resin layer 23, it is possible to realize a paper package 1 that is highly effective in reducing environmental load. can.

The thermoadhesive resin layer 23 may be formed of a resin film dry laminated on the paper base material 22. Examples of the resin film forming the heat-adhesive resin layer 23 include a low-density polyethylene film, a linear low-density polyethylene film, and an unstretched polypropylene film. The thickness of the heat-adhesive resin layer 23 made of a resin film is, for example, 25 to 60 μm.

Further, the thermal adhesive resin layer 23 contains an adsorbent. When the contents of the paper package 1 are confectionery such as candy or chocolate, if alcohol, which is a sweet flavor component of the confectionery, leaks outside, it will attract pests. Therefore, the adsorbent contained in the thermoadhesive resin layer 23 includes hydrophobic zeolite that has high adsorption performance for alcohols. Hydrophobic zeolite is an inorganic porous material that physically adsorbs aroma components such as alcohols.

Generally, the higher the SiO ₂ /Al ₂ O ₃ molar ratio of zeolite, the higher the hydrophobicity. Therefore, it is preferable that the hydrophobic zeolite contained in the thermoadhesive resin layer 23 has a SiO ₂ /Al ₂ O ₃ molar ratio of 30 to 10,000. Thereby, adsorption of water can be suppressed and high adsorption performance for alcohols can be obtained.

The hydrophobic zeolite can have any external shape such as spherical, rod-like, or elliptical shape, and can have any form such as powder, lump, or granule. From the viewpoints of film-forming properties of the thermoadhesive resin layer 23, uniform dispersion in the thermoadhesive resin, kneading characteristics, etc., it is more preferable to use the hydrophobic zeolite in powder form.

The size of the hydrophobic zeolite can be appropriately selected depending on the application, but the average particle diameter is preferably 0.01 μm to 10 μm. The average particle diameter is more preferably 0.1 μm to 8 μm, and even more preferably 1 μm to 7 μm. Here, the average particle diameter is a value measured by a dynamic light scattering method.

When the average particle diameter is smaller than 0.01 μm, the hydrophobic zeolite tends to aggregate, and the dispersibility of the hydrophobic zeolite in the thermoadhesive resin decreases. Furthermore, if the average particle diameter is larger than 10 μm, the amount of hydrophobic zeolite added cannot be increased and the surface area will also decrease, making it impossible to obtain a sufficient adsorption effect. Moreover, the film formability of the thermally adhesive resin layer 23 deteriorates.

If the content of hydrophobic zeolite in the heat-adhesive resin layer 23 is 0.1% by mass or more, it is possible to exhibit a sufficient adsorption effect. The content of hydrophobic zeolite is more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more. On the other hand, in order to obtain good film formability and thermal adhesiveness of the thermoadhesive resin layer 23, the content of hydrophobic zeolite is preferably 15% by mass or less, more preferably 10% by mass or less.

Further, the adsorbent contained in the heat-adhesive resin layer 23 may be a hydrophobic zeolite carrying a chemical adsorbent. For example, the chemical adsorbent can be supported by the hydrophobic zeolite by impregnating the hydrophobic zeolite with a solution containing the chemical adsorbent and then drying the impregnated solution.

A chemical adsorbent has a reactive functional group that causes a chemical reaction and bonds with an odorant. Therefore, it is possible to improve the adsorption performance not only for alcohols released from sweets and the like, but also for other aroma components.

When the target aroma component is an acidic substance such as carboxylic acids, hydrogen sulfide, or mercaptans, a compound having a basic functional group as the reactive functional group can be used. Compounds with basic functional groups include compounds with hydroxyl groups (hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, iron hydroxide, etc.), metal carbonates (sodium carbonate, calcium carbonate, etc.), and metals. Hydrogen carbonates (sodium hydrogen carbonate, etc.), amino group-containing compounds (polyamines such as tetramethylene diamine, alkylamines, ethanolamine, piperidine, etc.), amide group-containing compounds (2-acrylamido-2-methylpropanesulfonic acid, etc.) Can be used.

For example, when the aroma component is a carboxylic acid, if a compound having a hydroxyl group is used, the carboxyl group and the hydroxyl group will cause a chemical reaction and bond, and the aroma component will be adsorbed.

When the target aroma component is a basic substance such as ammonia or amines, a compound having an acidic functional group as the reactive functional group can be used. As the compound having an acidic functional group, phosphoric acid, sulfonic acid, carboxylic acid, metal salts thereof, etc. can be used. For example, if the aroma component is ammonia and a compound having a phosphate group is used, the ammonia and the phosphate group will cause a chemical reaction and bond, and the aroma component will be adsorbed.

When the target fragrance component is an aldehyde, an amino group-containing compound can be used, and an amino group-containing compound having a plurality of primary amino groups at its terminal is particularly preferred. As a result, the aldehyde group and the amino group cause a chemical reaction and bond, and the fragrance component is adsorbed.

Furthermore, by using an amphoteric substance (metal oxide such as zinc oxide) as a chemical adsorbent, acidic and basic substances can be adsorbed.

The thermoadhesive resin layer 23 is formed of a single layer resin composition in which an adsorbent is kneaded into the resin, but the thermoadhesive resin layer 23 may have a multilayer structure made of different resins.

The adsorbent may be uniformly dispersed in the thermoadhesive resin layer 23, or may be dispersed with a concentration gradient in the thickness direction. For example, the adsorbent may be dispersed within the thermoadhesive resin layer 23 by providing a concentration gradient that tends to increase from the inner surface to the outer surface when the paper package 1 is formed. This improves the thermal adhesiveness of the thermally adhesive resin layer 23.

Alternatively, the adsorbent may be dispersed within the thermoadhesive resin layer 23 by providing a concentration gradient that tends to decrease from the inner surface to the outer surface when the paper package 1 is formed. This improves the interlayer adhesive strength between the thermal adhesive resin layer 23 and the paper base material 25. Furthermore, the adsorbent may be dispersed by providing a concentration gradient that tends to decrease from the central portion in the thickness direction of the thermoadhesive resin layer 23 toward both surfaces. This improves the thermal adhesiveness of the thermal adhesive resin layer 23 and the interlayer adhesive strength between the thermal adhesive resin layer 23 and the paper base material 25.

The seal portion 3 is formed by disposing the thermoadhesive resin layer 23 of the wrapping paper 20 on the inner surface side and thermally bonding the opposing thermoadhesive resin layers 23. Thereby, a sealable paper package 1 is obtained by thermally bonding the thermoadhesive resin layer 23 along the opening 1a. At this time, the printing layer 21 is arranged on the outer surface side of the paper base material 22. After filling the storage portion 9 with the contents, thermal bonding is performed along the opening 1a to seal the paper package 1 and the contents are sealed.

The thermoadhesive resin layer 23 containing an adsorbent is adjacent to the contents and adsorbs alcohol, which is a sweet aroma component released from sweets and the like. This prevents the fragrance components from leaking to the outside, thereby preventing insects that are attracted to the fragrance components of sweets from damaging the contents.

According to this embodiment, the paper package 1 can be sealed by thermal adhesion of the thermally adhesive resin layer 23, and the thermally adhesive resin layer 23 disposed on the paper base material 22 contains an adsorbent containing hydrophobic zeolite. Contains. Thereby, the sweet aroma components of confectionery are adsorbed by the hydrophobic zeolite, and are prevented from leaking from the paper package 1 to the outside. Therefore, it is possible to prevent the contents from being harmed by pests that are attracted to the aroma components of confectionery.

Furthermore, since the SiO ₂ /Al ₂ O ₃ molar ratio of the hydrophobic zeolite is 30 to 10,000, an adsorbent with high adsorption performance for alcohols can be easily realized.

Furthermore, when the adsorbent is formed of an inorganic porous material in which a chemical adsorbent is supported on hydrophobic zeolite, aroma components other than alcohols released from sweets and the like can also be adsorbed. Therefore, damage caused by pests can be further prevented.

Furthermore, since the thermoadhesive resin layer 23 is formed of an extruded thermoadhesive resin, the paper package 1 in which the adsorbent-containing thermoadhesive resin layer 23 is disposed on the paper base material 25 can be easily assembled. It can be realized.

Moreover, since the wrapping paper 20 of the laminate does not include a stretched film, it is possible to reduce the amount of petroleum-derived materials and reduce the environmental load.

<Second embodiment>
Next, a second embodiment will be described. In this embodiment, the heat-adhesive resin layer 23 is formed of a coating film containing hydrophobic zeolite. Other parts are the same as those in the first embodiment.

The thermoadhesive resin layer 23 is made of a coating film that coats the paper base material 22, and is formed by applying a coating liquid of a thermoadhesive resin onto the paper base material 22. As the thermal adhesive resin for coating, acrylic resin, polyolefin resin, vinyl chloride/vinyl acetate copolymer resin, etc. can be used. In this embodiment, a polyolefin thermal adhesive resin (Chemipearl (registered trademark) S300) manufactured by Mitsui Chemicals, Inc. is used.

The coating amount of the thermal adhesive resin coating liquid can be, for example, 1.5 to 6 g/m ² . In this embodiment, it is set to 3 g/m ² . Further, although the thermally adhesive resin layer 23 may be provided only on the thermally bonded portion on the paper base material 22, it is more preferable to provide it on the entire surface. This provides water resistance and puncture resistance. In addition, when an adsorbent is included in the coating liquid of the thermoadhesive resin, the adsorption performance for aroma components of confectionery can be improved.

When the heat-adhesive resin layer 23 is formed of a coating film, the thickness is small, so that the paper package 1 has excellent recyclability. It is also more desirable than extruded resin or resin film because it reduces the amount of petroleum-derived materials and reduces environmental impact.

If the content of hydrophobic zeolite in the thermally adhesive resin layer 23 is 0.1% by mass to 15% by mass as described above, good adsorption performance, film forming properties, and thermal adhesiveness can be obtained. The lower limit of the hydrophobic zeolite content is more preferably 0.3% by mass, and even more preferably 0.5% by mass. Further, it is more preferable that the upper limit of the content of hydrophobic zeolite is 10% by mass.

According to this embodiment, as in the first embodiment, the thermal adhesive resin layer 23 contains an adsorbent containing hydrophobic zeolite. Therefore, it is possible to prevent the contents from being harmed by pests that are attracted to the aroma components of confectionery.

Moreover, since the thermally adhesive resin layer 23 is made of a coating film in which the paper base material 22 is coated with a thermally adhesive resin, it is possible to obtain a paper package 1 that has excellent recyclability and can reduce environmental burden. At this time, the weight ratio of the paper base material 22 to the entire paper package 1 can be easily increased to 50% or more, and a paper package 1 that is highly effective in reducing environmental load can be easily realized.

<Third embodiment>
Next, a third embodiment will be described. In this embodiment, hydrophobic zeolite is contained in the printing layer 21 instead of the heat-adhesive resin layer 23. Other parts are the same as those in the first embodiment.

The thermoadhesive resin layer 23 is formed of the same extruded resin as in the first embodiment. Note that the thermal adhesive resin layer 23 may be formed using a coating film similar to that of the second embodiment. Furthermore, although the thermal adhesive resin layer 23 does not contain an adsorbent containing hydrophobic zeolite, it may contain it as in the first and second embodiments.

The ink forming the ink layer 21a of the printing layer 21 contains an adsorbent containing hydrophobic zeolite similar to the above. Further, the ink forming the ink layer 21a is a water-based ink that uses water as a solvent and does not contain alcohol. Therefore, it is possible to prevent deterioration of printing suitability and deterioration of adsorption performance due to adsorption of alcohol in the ink by the adsorbent.

The hydrophobic zeolite preferably has an average particle diameter of 0.01 μm to 10 μm. The average particle diameter is more preferably 0.1 μm to 8 μm, and even more preferably 1 μm to 7 μm. When the average particle diameter is smaller than 0.01 μm, the hydrophobic zeolite tends to aggregate, and the dispersibility of the hydrophobic zeolite in the binder resin of the ink decreases. Furthermore, if the average particle diameter is larger than 10 μm, the amount of hydrophobic zeolite added cannot be increased and the surface area will also decrease, making it impossible to obtain a sufficient adsorption effect. Moreover, it causes unevenness on the surface of the ink layer 21a, which causes deterioration of printing performance.

If the content of hydrophobic zeolite in the ink layer 21a is 0.1% by mass or more, it is possible to exhibit a sufficient adsorption effect. The content of hydrophobic zeolite is more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more. On the other hand, in order to obtain good processability of the ink layer 21a, the content of hydrophobic zeolite is preferably 15% by mass or less, and more preferably 10% by mass or less.

Although the ink layer 21a may be provided only on the portion of the paper base material 22 where a pattern or the like is to be formed, it is more preferable to provide the ink layer 21a on the entire surface because it can reliably adsorb the aroma components of confectionery.

Note that the adsorbent may be contained in the varnish forming the OP varnish layer 21b provided on the entire surface of the paper base material 22. At this time, the adsorbent in the ink layer 21a may be omitted.

According to this embodiment, as in the first embodiment, the print layer 21 contains an adsorbent containing hydrophobic zeolite. Therefore, it is possible to prevent the contents from being harmed by pests that are attracted to the aroma components of confectionery.

Further, an adsorbent is contained in the printing ink forming the ink layer 21a or the varnish forming the OP varnish layer 21b. Therefore, the printed layer 21 containing the adsorbent can be easily realized.

Furthermore, since the ink forming the ink layer 21a is water-based and does not contain alcohol, it is possible to prevent deterioration of printing suitability and deterioration of adsorption performance due to adsorption of alcohol in the ink by the adsorbent. Similarly, when the varnish forming the OP varnish layer 21b contains an adsorbent, it is preferable to use an aqueous varnish that does not contain alcohol.

In the first to third embodiments, the paper packaging body 1 is formed as a three-sided sealed bag, but the paper packaging body 1 may be formed in other forms such as a pillow-shaped bag or a free-standing bag. Good too.

INDUSTRIAL APPLICATION According to this invention, it can be utilized for the packaging bag etc. which package sweets etc.

1 Paper package 1a Opening 3 Seal portion 9 Storage portion 20 Wrapping paper 21 Printing layer 21a Ink layer 21b OP varnish layer 22 Paper base material 23 Heat-adhesive resin layer

Claims (7)

A laminate including a paper base, a printed layer printed on one side of the paper base, and a thermoadhesive resin layer disposed on the other side of the paper base, and the facing thermal adhesive In a paper package that can be sealed by thermal adhesion of a polyurethane resin layer,
The printing layer has an ink layer coated with printing ink and an OP varnish layer coated with varnish on the upper layer of the ink layer, and the printing ink or the varnish contains an adsorbent containing hydrophobic zeolite. A paper packaging body characterized by containing : The paper package according to claim 1, wherein the hydrophobic zeolite forming the adsorbent has a SiO ₂ /Al ₂ O ₃ molar ratio of 30 to 10,000. The paper package according to claim 1 or 2, wherein the adsorbent is formed of hydrophobic zeolite carrying a chemical adsorbent. 4. The method according to claim 1, wherein the adsorbent is contained in the thermoadhesive resin layer, and the thermoadhesive resin layer is formed of an extruded thermoadhesive resin. Paper packaging. The adsorbent is contained in the thermoadhesive resin layer, and the thermoadhesive resin layer is comprised of a coating film in which the paper base material is coated with a thermoadhesive resin. 3. The paper package according to any one of 3. The paper package according to any one of claims 1 to 3, wherein the printing ink or the varnish containing the adsorbent is aqueous and does not contain alcohol. The paper package according to any one of claims 1 to 6 , wherein the laminate does not include a stretched film.

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