JP5573252B2 - Packaging materials, and packaging containers and lids using the same - Google Patents

Description

  The present invention relates to a container for storing contents that require resealability even after opening, and a packaging material used therefor, and more specifically, food, drinks, cosmetics, pharmaceuticals, etc. are stored as the contents, The present invention relates to a packaging container and lid material having a property of retaining their moisture, flavor, fragrance component, medicinal component and the like by resealing after opening, and a packaging material used for these.

  Conventionally, a representative example of a packaging container having resealability is a packaging container for wet tissue. The packaging container includes a bag body made of a packaging material having a barrier property composed of a biaxially stretched plastic film layer / adhesive resin layer / aluminum foil layer / adhesive resin layer / thermoplastic resin layer, and a part of the bag body. The opening part of the bag body can be opened and closed by opening and closing the adhesive seal. However, this conventional packaging container is expensive because it uses two members, and because the filling line is complicated, there are restrictions on the contents that can be filled, and what is a highly versatile packaging container? I could not say.

  In contrast, attempts have been made to make a single member by using a multilayer film in which an adhesive resin layer is laminated as an intermediate layer. The multilayer film shown in Document 1 contains a surface resin layer mainly composed of an ethylene- (meth) acrylic acid copolymer and / or a metal neutralized product thereof (ionomer resin), a styrene block, and a diene block. An adhesive resin layer comprising a rubber block copolymer hydrogenated product and a tackifier, and a heat seal resin layer comprising an olefin resin, a polyester resin or a styrene resin as a main component. Is a multilayer sealant film laminated in this order by coextrusion lamination.

Japanese Patent No. 4220881

  When the multilayer sealant film shown in Document 1 is co-extruded with a surface resin layer and a heat seal resin layer in a stacking order in which the adhesive resin layer is sandwiched to obtain a multilayer sealant film, the material used and the thickness of each resin layer The present invention intends to provide a re-sealable multilayer sealant film having low odor, suitability for continuous film formation, and excellent adhesiveness of an opening seal part. The packaging material laminated with this sealant is opened by the cohesive failure of the heat seal resin layer and the adhesive resin layer or the adhesive resin layer when the seal part is opened, and the resealability is exhibited by the exposed adhesive resin layer. It is.

  However, it is necessary to make the adhesive resin layer thinner in order to control the adhesive force, particularly in reducing the reseal strength, but because there is a limit to the layer thickness control during film formation, it exhibits stable low peel properties. Obtaining a film is very difficult. Moreover, since special resin is used, it leads to a cost increase and its versatility is low. And since the resealability is exhibited only in the seal portion, there is a problem that the unsealing portion cannot be provided separately from the seal portion, and the packaging form and the unsealing method are restricted.

Therefore, the present invention intends to solve the above-mentioned problems widely, and the object of the present invention is to easily provide a layer exhibiting adhesiveness partially or entirely. ,
The purpose of the present invention is to provide a packaging material having a comprehensively excellent performance that allows adjustment of peel strength and resealing strength, a packaging container using the packaging material, and a lid material with low cost and high productivity.

As means for solving the above-mentioned problems, the invention according to claim 1 is an aqueous dispersion type comprising a first substrate made of a single-layer or multi-layer member, a thermoplastic resin, a tackifying resin, and a solid plasticizer. A second base material made of a single-layer or multi-layer member having a tackifying layer made of a delayed tack agent, a thermoplastic resin layer formed by a melt extrusion method on the tackifying layer side, and a thermoplastic resin A sealant layer is sequentially laminated, and the tackifying layer is laminated at least partially.

The invention according to claim 2, the thermoplastic resin in the tackifier layer is an ethylene - a packaging material according to claim 1, wherein the vinyl acetate copolymer (EVA).

The invention according to claim 3, using the packaging material according to claim 1 or 2, comprising the sealant layers to each other a packaging container formed by hot-melt adhesive, said first substrate, tackifier A first opening formed by an incision penetrating the layer and a second opening formed by an incision penetrating the second base material and the sealant layer, wherein the second opening is a first A packaging container characterized by being in the region of the opening.

The invention described in claim 4 is a lid member using the packaging material according to claim 1 or 2 , wherein the sealant layer is melt bonded to another container, and the first base material and And a second opening formed by a notch penetrating the tackifier layer and a second opening formed by an incision penetrating the second base material and the sealant layer. Is a lid material characterized by being in the region of the first opening.

  The packaging material according to the present invention includes a first base material composed of a single layer or multilayer member, a tackifier layer composed of an aqueous dispersion type delayed tack agent containing a thermoplastic resin, a tackifier resin and a solid plasticizer, A packaging material characterized in that a second substrate made of a layer or multilayer member and a sealant layer made of a thermoplastic resin are sequentially laminated, and the tackifier layer is laminated at least partially. , Adhesiveness is developed when the tackifier resin melts by melting the solid plasticizer of the delayed tack agent due to heat at the time of processing to laminate the tackifying layer or thermocompression bonding in the post-processing. To do. The lamination of the tackifier layer can be applied by reverse printing at the same time as the front pattern, as an adhesive for dry lamination type adhesion method, as an anchor coating agent for melt extrusion resin adhesion method, and thermocompression lamination. It is also possible to provide as an adhesive for the method. Moreover, since the delayed tack agent is aqueous and the odor of the resin component is low, it is possible to provide a versatile packaging material with low residual solvent and resin odor.

The second substrate is, since it has a thermoplastic resin layer formed by melt extrusion method tackifier layer side, sticky delayed tack agent by heat of the thermoplastic resin during melt-extrusion Therefore, a dedicated heating step is not necessary, damage to the substrate is small, and more general lamination can be performed.

When the thermoplastic resin of the tackifying layer is an ethylene-vinyl acetate copolymer (EVA), it is possible to bond the first base material and the second base material at a relatively low temperature. There is little damage to the material, and adhesive strength can be easily imparted.

In invention of Claim 3 , it is a packaging container which melt-bonds the said sealant layers using the packaging material of Claim 1 or 2 , Comprising: Said 1st base material and tackifying layer And a second opening formed by a notch penetrating the second base material and the sealant layer, and the second opening is a first opening. Since the region between the first opening and the second opening is an area where the tackifying layer is exposed, the second opening is taken out. And a region between the first opening and the second opening can be used as a resealable packaging container that can be used as an adhesive region for resealing.

In the invention according to claim 4 , similarly to the above, the second opening can be used as an outlet, and the area between the first opening and the second opening can be used as an adhesive area for resealing. It is useful as a possible resealable lid.

It is the cross-sectional schematic diagram which showed one embodiment of the packaging material which concerns on this invention. It is the cross-sectional schematic diagram which showed the other embodiment of the packaging material which concerns on this invention. It is the perspective view which showed one embodiment of the packaging container which concerns on this invention. FIG. 4 is a schematic cross-sectional view showing the X-X ′ cross section of FIG. 3. It is an expanded sectional explanatory view of the opening part of the packaging container shown in FIG. FIG. 6 is an explanatory cross-sectional view showing a state in which the opening shown in FIG. 5 is opened. It is the cross-sectional schematic diagram which showed one embodiment of the cover material which concerns on this invention.

  Hereinafter, according to the drawings, a packaging material according to the present invention, a packaging container using the same, and a lid material will be described in detail. FIG. 1 is a schematic cross-sectional view showing an embodiment of a packaging material according to the present invention. A packaging material 1 according to the present invention comprises a first base material 2 made of a single layer or multilayer member, a tackifier layer 3, a second base material 4 made of a single layer or a multilayer member, and a thermoplastic resin. The sealant layer 5 is sequentially laminated.

  The first substrate 2 is composed of various paper substrates, biaxially stretched films such as polypropylene (PP), polyethylene terephthalate (PET), and nylon, a single layer such as an aluminum foil, or a multilayer member obtained by combining these. A laminate can be used. On the front and back surfaces or the intermediate layer of the first base material 2, an ink layer for imparting a pattern or light shielding property can be laminated.

  The tackifier layer 3 is composed of an aqueous dispersion type delayed tack agent containing a thermoplastic resin, a tackifier resin, and a solid plasticizer, and the tackifier layer 3 is laminated at least partially. In FIG. 1, the tackifier layer 3 is partially provided instead of the entire surface, but may be provided over the entire surface.

Examples of the delayed tacking agent used for the tackifier layer 3 include conventionally known dick seal DLA (manufactured by DIC), heat magic (manufactured by Toyo Ink Manufacturing Co., Ltd.), and the like, and these can be used. However, in the case of packaging materials used in food and cosmetic applications, considering the problem of environmental hormones, the solid plasticizer in the component is not a phthalate ester-based solid plasticizer such as dicyclohexyl phthalate (DCHP), It is desirable to select phthalate-based materials. The delayed tack-type pressure-sensitive adhesive is laminated by coating on the laminated surface of the first base material 2 or the second base material 4, but if the coating amount is small, the initial adhesion to the adherend is insufficient. However, if the amount is too large, it is difficult to obtain a smooth coating surface, and the drying property is also lowered. However, depending on the substrate, ² to 25 g / m ² is preferable, and 5 to 15 g / m ² is particularly preferable.

  By using an ethylene-vinyl acetate copolymer (EVA) resin as a thermoplastic resin component used for the tackifying layer 3, it becomes possible to bond the first base material and the second base material at a relatively low temperature, There will be little damage to a base material and adhesive strength can be easily provided.

  The tackifier layer 3 can be applied by printing by gravure printing, flexographic printing, screen printing, or the like. When printing is applied simultaneously with pattern printing using a printing machine, partial coating synchronized with the pattern becomes possible, and the effects of the present invention are sufficiently exhibited. The tackifier layer 3 can also be applied by a coater. As a coating method, a general-purpose coating machine such as a gravure coater, a roll coater, a lip coater, or a bar coater can be used. The tackifier layer 3 may be applied as an anchor coating agent during lamination by extrusion resin processing.

The second substrate 4 has a single layer or multilayer structure, and in the case of a multilayer, it is possible to laminate paper, a film, a metal foil, an ink layer, and the like as with the first substrate. As shown in FIG. 2, the first and the second substrate 4 and multilayer, since a structure having a thermoplastic resin layer 7 formed by melt extrusion method tackifier layer 3 side, to form a tackifier layer 3 The base material 1 and the base material 2 of the second base material 4 can be bonded together by the melt-extrusion laminating method of the thermoplastic resin layer 7. The heat at this time is used to activate the tackifier layer 3, and the adhesiveness Therefore, the packaging material according to the present invention can be manufactured very efficiently.

  The sealant layer 5 includes a low density polyethylene resin (LDPE), a linear low density polyethylene resin (LLDPE), a polypropylene resin (PP), an ethylene-vinyl acetate copolymer resin (EVA), and an ethylene-methacrylic acid copolymer. A resin layer mainly composed of an acid copolymer resin such as resin (EMAA) or ethylene-acrylic acid copolymer resin (EAA), or an easy peel sealant resin layer composed mainly of these is used. The lamination method of the sealant layer is based on a film laminating method, a molten resin extrusion method, a hot melt coating method, a thermal lamination method, or the like. In any case, the material of the sealant layer 5 is selected according to the materials on the joint surfaces of the interior surfaces or at least the opening peripheral edge (flange) of the adherend container.

  FIG. 3 is a perspective view showing an embodiment of the packaging container according to the present invention. 4 is a schematic cross-sectional view showing the X-X ′ cross section of FIG. 3, and FIG. 5 is an enlarged cross-sectional explanatory view of the opening of the packaging container shown in FIG. 3. FIG. 6 is an explanatory sectional view showing a state where the opening shown in FIG. 5 is opened. The packaging container 10 shown in FIGS. 3 and 4 is a packaging container formed by melting and bonding the sealant layers 5 of the seal part 15 and the joint seal part 17 using the packaging material according to the present invention described above. Second opening formed by the first base material 2, the first opening 13 formed by the notch 11 penetrating the tackifier layer 3, and the notch 12 penetrating the second base material 4 and the sealant layer 5. And the second opening 14 is in the region of the first opening 13. In FIG. 4, for the sake of clarity, the palm seal portion 17 is drawn perpendicular to the bottom surface of the container, but in an actual container, it is folded and parallel to the bottom surface of the container.

  The packaging container shown in FIGS. 3 and 4 is a container for storing a wet tissue, and is a container having resealability capable of resealing the take-out port even after opening. This container is required to be a container that does not dissipate moisture and fragrance contained in the wet tissue as the contents. Since the packaging material constituting the container body and the material constituting the lid of the opening are the same packaging material, the packaging container 10 according to the present invention is opened by making the packaging material itself low in gas permeability. The permeability of the rear lid can be ensured as well.

  As shown in FIGS. 5 and 6, the first substrate 2, the first opening 13 formed by the notch 11 that penetrates the tackifier layer 3, the second substrate 4, and the sealant layer 5 are penetrated. And the second opening 14 is formed in the region of the first opening 13, so that the second opening 14 serves as an outlet, and the Since the tackifier layer 3 is exposed in the region sandwiched by the notches 12 and exhibits adhesiveness, it can be resealed.

  In addition, although it is preferable that the notch 11 cut | disconnects the 1st base material 2 completely, the tackifier layer 3 does not need to cut | disconnect completely. On the other hand, it is preferable that the notch 12 cuts the second base material 4 and the sealant layer 5 completely, but it may be further cut to the tackifier layer 3. Therefore, when the cut 11 and the cut 12 are provided, it is possible to give a width to the setting of the cut depth, and the difficulty in manufacturing is low.

  The cuts 11 and 12 may be formed by mechanical cutting using a cutter such as a rotary die cutter or a punching die, or by laser cutting using a laser processing machine.

  FIG. 7 is a schematic cross-sectional view showing an embodiment of a lid according to the present invention. The lid material 20 according to the present invention is a lid material using the packaging material according to the present invention, and is formed by melt-bonding the sealant layer 5 to another container 21, and the first base material 2 and the tackifier layer 3. A first opening 13 formed by a notch 11 penetrating through the second base 14 and a second opening 14 formed by a notch 12 penetrating the second base material 4 and the sealant layer 5. 14 is in the region of the first opening 13.

  The container 21 shown in FIG. 7 is generally a plastic molded container having a flange portion 22, but may be a paper container having the flange portion 22 formed therein. As a molding method for a plastic container, an injection molding method or a vacuum molding method is generally used. In the case of a paper container, it is common to provide a thermoplastic resin layer on the side of the paper layer that becomes the container inner surface, and heat-seal the thermoplastic resin layer of the flange portion and the sealant layer 5 of the lid member 20. . Whether it is a plastic container or a paper container, it is preferable that the container has a barrier property so that the components contained in the contents 16 are not volatilized.

  As in the case of the packaging container, the first substrate 2, the first opening 13 formed by the notch 11 that penetrates the tackifier layer 3, the second substrate 4, and the cut that penetrates the sealant layer 5. Since the second opening 14 formed by the notch 12 exists and the second opening 14 is in the region of the first opening 13, the second opening 14 serves as a take-out port, and the notch 11 and the notch Since the tackifier layer 3 is exposed in the region sandwiched by 12 and exhibits adhesiveness, it can be resealed.

When providing an opening part in a part of the packaging material, a notch 12 penetrating the second base material 4 is provided in the notch 11 region penetrating the first base material 2, and is not adhered to the region of the opening tab. By disposing a notch penetrating only the first base material layer, a locking portion that can be locked to the periphery of the adherend container is formed, and further improvement in dead hold property at the time of resealing Measures can also be given.
In the above configuration, the paper layer 1 is the base material of the lid member 10 as described above. When the basis weight is less than 70 g / m ² , the rigidity and mechanical strength are slightly insufficient, and 130 g / m ^2. Is more than enough, the rigidity is already sufficient, there is no need for more, it takes time to heat seal, it is preferable because there is a decrease in the interlaminar strength of the paper, the ease of folding of the paper at the time of opening, etc. Absent.
Hereinafter, the present invention will be described more specifically by way of examples. However, the present invention is not limited to these examples.

The heat-sealing lid material having the layer structure shown in FIG. 1 is prepared, and biaxially stretched P having a thickness of 12 μm.
Using a multicolor gravure printing machine on the outer surface of the ET film, the light-shielding ink containing a mixed pigment of carbon black and titanium oxide is overprinted in two units using a solid plate with a plate depth of 35 μm and applied. A light-shielding ink layer having an amount of 6 g / m ² (solid content) was provided. Next, a first base material that is a laminate of a paper layer and a PET film layer is prepared by laminating a paper base material having a total paper basis weight of 105 g / m ^{2 on} the printed surface of the PET film by a non-solvent lamination method as an exterior base material for the cover material. Got.

On the outer surface side (paper substrate side) of this first substrate, an ink layer such as letters, pictures, and glossy varnish is printed using a multicolor gravure printing machine, and at the same time, a cover material knob on the inner surface side (PET side) A non-phthalate ester-based delayed tack sealant (Dick Seal DLA ED-970, manufactured by DIC Corporation) is used as a tackifier layer in the region surrounded by the tab portion and the outer periphery of the adherend container and the region including the adjacent seal portion. ² m / m ² of butadiene-based anchor coating agent (EL-451 manufactured by Toyo Ink Manufacturing Co., Ltd.) was applied and dried in other areas.

  Next, an easy peel sealant resin mainly composed of a low-density polyethylene resin layer (thickness 10 μm) / ethylene-methacrylic acid copolymer as the second base material and the sealant layer is formed on the coated surface by a melt extrusion method using a T die. Two layers (thickness 10 μm) were laminated by co-extrusion resin processing to obtain the intended packaging material. After the lamination, half-cut processing from the front and back surfaces and all-round removal were performed with a rotary die cutter, and the lid product of Example 1 was obtained.

A packaging container having a shape as shown in FIG. 3 is prepared, and a multicolor gravure printing machine is used on the inner surface side of a biaxially stretched OPP film having a thickness of 30 μm as a first base material. The layer is printed, and at the same time, 5 g / m ^{2 of} a non-phthalate ester-based delayed tack sealant (Dick Seal DLA ED-965XT, manufactured by DIC) as a tackifier layer in the opening opening of the bag body, non-opening area A butadiene anchor coating agent (EL-451 manufactured by Toyo Ink Manufacturing Co., Ltd.) was applied at ² g / m ² and dried. In addition, neither the delayed tack agent nor the anchor coating agent was applied to the region that becomes the tab portion of the opening.

Next, a CPP sealant having a thickness of 30 μm, in which a low-density polyethylene resin as a second substrate is formed by melt extrusion using a T die so as to have a thickness of 15 μm, and a PE component is laminated on the adhesive surface side from the second unwinding. The film was unwound and bonded to obtain a laminate of Example 2. After lamination, half cut processing from the front and back surfaces was performed with a rotary die cutter, and an opening as shown in FIG. 3 was provided. Pillow packaging was performed while filling the contents with a pillow packaging and filling machine to obtain a packaging container as shown in FIG.
<Comparative Example 1>

A lid stock was prepared in the same manner as in Example 1 except that the tackifier layer was not used.
<Comparative example 2>

  In Example 2, an anchor coating agent was applied to the entire surface of the OPP film on which only characters, pictures, and a light-shielding ink layer were printed, and then the extruded PE layer was extruded in the same manner to form a recloseable multilayer sealant (manufactured by DIC). , Patent No. 4220881) was obtained.

(Evaluation method)
The raw materials of Examples 1 and 2 and Comparative Examples 1 and 2 produced as described above were punched into a circular shape with a diameter of 180 mm with a knob piece (opening tab) for Example 1 and Comparative Example 1. Then, a single-wafer-shaped lid was prepared, and heat sealed at 130 ° C. × 0.5 sec × 0.3 MPa in a foamed polystyrene molded container and adhered to the container. About Example 2 and Comparative Example 2, it was bag-made with the pillow packaging machine. The opening of these packaged bodies was opened from the knob part, and the openability and resealability were evaluated. In Comparative Example 2, any one of the top and bottom seal portions at the time of bag making was used as an opening. If the opening was obtained, the openability was ○, and if the opening was not possible, it was ×. If the opened opening can be closed again, the re-sealability is ○, and if not, it is ×.

(Evaluation results)

  Thus, the lid material and the packaging container using the packaging material according to the present invention showed good results not only for the unsealing property but also for the odor and the resealability.

DESCRIPTION OF SYMBOLS 1 ... Packaging material 2 ... 1st base material 3 ... Tackifying layer 4 ... 2nd base material 5 ... Sealant layer 6 ... Pattern layer 7 ... Thermoplastic resin layer 10 ... Packaging containers 11, 12 ... Incision 13 ... First opening 14 ... Second opening 15 ... Seal 16 ... Contents 17 ... Palm seal 18 .... Opening tab 20 ... Lid 21 ... Container 22 ... Flange

Claims (4)

A first base material composed of a single layer or multilayer member, a tackifier layer composed of an aqueous dispersion type delayed tack agent containing a thermoplastic resin, a tackifier resin and a solid plasticizer, and a melt extrusion method on the tackifier layer side A second substrate made of a single layer or multilayer member having a formed thermoplastic resin layer and a sealant layer made of a thermoplastic resin are sequentially laminated, and the tackifier layer is at least partially A packaging material characterized by being laminated. The thermoplastic resin tackifying layer, an ethylene - packaging material according to claim 1, wherein the vinyl acetate copolymer (EVA). A packaging container obtained by melting and bonding the sealant layers to each other using the packaging material according to claim 1 or 2 , wherein the first base material is formed by a notch penetrating the tackifier layer. 1 opening part, and the 2nd opening part formed by the notch which penetrates the 2nd above-mentioned base material and a sealant layer, and the 2nd opening part is in the field of the 1st opening part, Packaging container. It is a lid | cover material using the packaging material of Claim 1 or 2 , Comprising: The said sealant layer is melt-bonded to another container, and it forms by the said 1st base material and the notch which penetrates a tackifying layer. And a second opening formed by a notch penetrating the second base material and the sealant layer, and the second opening is in a region of the first opening. A lid material characterized by.

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