JP5410788B2 - Packaging container manufacturing method - Google Patents

Description

  The present invention relates to a method of manufacturing a packaging container in which a non-metallic cutting blade for cutting a rolled package is joined to a paper container main body that houses the rolled package.

  Packaging containers for packages such as wrap film and aluminum foil that wrap foods, etc., contain roll-shaped packages in the form of rolled packages in cardboard containers, and the required length The package is generally used in such a manner that it is pulled out from the container body. In the packaging container used in this way, a saw-toothed cutting blade is joined to the container body, and the pulled-out package is immediately cut by this cutting blade so that the user who uses the packaging container can use it. On the other hand, it is designed for convenience.

  As the constituent material of the cutting blade, a metal material has been conventionally used from the viewpoint that it is easy to obtain a cutting property with respect to a package and durability of the cutting blade. On the other hand, in recent years, functions such as adaptability to the environment and safety for the user are strongly demanded by the cutting blade, and as a response to such a demand, non-patent documents 1 such as cardboard and resin are used. Metal products have also been considered. In addition, even with such a cutting blade structure, in order to achieve cutting properties suitable for the cutting object and cutting method, in particular, in the above-described non-metallic cutting blades that are inferior in cutting properties compared to metal cutting blades. For the purpose of improving the cutting performance, various tooth shapes have been proposed as described in Patent Document 2 and Patent Document 3.

Japanese Patent No. 3573605 JP-A-5-178344 JP-A-8-40433

  By the way, in the cutting blade having the above-described configuration, the cutting ability corresponding to the structure is realized for the first time by appropriately fixing each tooth, which is a component of the cutting blade, to the container body. Become. Therefore, in order to improve the cutting performance of the cutting blade, not only the tooth shape as described above but also the bonding strength between the container body made of cardboard and the cutting blade is an important factor. In this regard, a conventional metal cutting blade has a sufficiently high rigidity compared to a cardboard container body, so that the cutting blade is caulked to the container body by a caulking portion or the like provided on the cutting blade. A structure can also be adopted, and according to such a joint structure, a mechanical joint strength between the cutting blade and the container main body can be secured. However, in the non-metal cutting blade that is difficult to obtain sufficient rigidity, it is difficult to employ the joining structure by the caulking portion as described above. As a result, the cutting blade and the container body only have one adhesive layer interposed therebetween. In a general joining structure, it is difficult to realize a cutting property according to the structure of the cutting blade.

  The present invention has been made in order to solve the above-mentioned problems, and the object thereof is a paper container body in which a non-metallic cutting blade for cutting a roll-shaped package accommodates the roll-shaped package. It is a manufacturing method of a packaging container formed by bonding to a packaging container, wherein the adhesion between the cutting blade and the container body is improved.

In the following, means for achieving the above object and its effects are described.
Invention of Claim 1 is a manufacturing method of the packaging container by which the nonmetallic cutting blade for cut | disconnecting the roll-shaped package was joined to the paper-made container main body which accommodates a roll-shaped package, The cutting blade having an adhesive layer made of a urethane-based adhesive composition and a sealant layer made of a polyethylene-based resin laminated on the adhesive layer is bonded, for example, to the base material constituting the container body by ultrasonic bonding. By applying heating and pressurizing, such as applying a method, the step of joining the cutting blade to the container body, a liquid comprising a main agent containing a polyester compound and a curing agent containing an aliphatic isocyanate compound, The adhesive layer is formed by applying to the base material constituting the cutting blade or the sealant layer, and the base material constituting the cutting blade is a polylactic acid type
The gist is that it is made of resin .

  According to the invention described in claim 1, two different layers having an adhesive function such as an adhesive layer made of a urethane-based adhesive composition and a sealant layer made of polyethylene are interposed between the cutting blade and the container body. Become. Therefore, the adhesion between the adhesive layer and the sealant layer, as well as between the cutting blade and the sealant layer and between the adhesive layer and the container body is improved, and as a result, the adhesion between the cutting blade and the container body. Will improve.

  In addition, it is thought that a polyether compound, a polycarbonate-type compound, etc. are applicable to the main ingredient of a urethane-type adhesive composition other than a polyester-type compound, when obtaining a urethane bond. In addition to the aliphatic isocyanate compound, an aromatic diisocyanate compound is also applicable to the curing agent of the urethane-based adhesive composition. However, with such polyether compounds and polycarbonate compounds, it is difficult to obtain sufficient adhesion between the nonmetallic cutting blade and the adhesive layer even if the curing agent is an aliphatic isocyanate compound. The adhesion between the cutting blade and the packaging container will be the same as that of a structure without an adhesive layer. In the case of an aromatic diisocyanate compound, even if the main component is a polyester compound, it is difficult to obtain a sufficient adhesion between the nonmetallic cutting blade and the adhesive layer. Adhesiveness with the packaging container is comparable to that of a structure without an adhesive layer. In this regard, according to the first aspect of the present invention, since the main component containing the polyester compound and the curing agent containing the aliphatic isocyanate compound are used as the constituent material of the adhesive layer, the nonmetallic cutting is performed. Sufficient adhesion force is obtained between the blade and the adhesive layer. Therefore, a packaging container with improved adhesion between the cutting blade and the container body can be provided.

In addition, according to the first aspect of the present invention, the adhesion between the cutting blade and the container body can be improved, and the polylactic acid resin has biodegradability. Will be suppressed.

The gist of the invention described in claim 2 is that the sealant layer is made of an ethylene- (meth) acrylic acid copolymer.
According to invention of Claim 2 , since a sealant layer is a structure which consists of ethylene- (meth) acrylic acid copolymer (EMAA), compared with the structure where a sealant layer consists of linear low density polyethylene, The adhesion between the sealant layer and the container body is further improved.

The perspective view which shows the perspective structure of the packaging container of this embodiment. Sectional drawing which shows the partial cross section structure of the packaging container of this embodiment. Process drawing which shows the joining process in the manufacturing method of the packaging container of this embodiment.

Hereinafter, a packaging container and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a perspective structure of a packaging container, and FIG. 2 is a sectional view showing a sectional structure of a connection mode of cutting blades in the packaging container.

  As shown in FIG. 1, a container body 11 constituting a packaging container 10 is formed in a box shape having a lid 11a, and a box body is formed by bending, for example, coated cardboard, which is a single cardboard. Assembled into a shape. A cardboard lid 11a constituting the upper part of the container body 11 is configured to continuously cover the entire upper opening of the container body 11 from the top edge 11b of the rear wall of the container body 11. Then, the lid 11a rotates with the top edge 11b serving as the rotation axis, whereby the entire upper portion of the container body 11 is opened and closed by the lid 11a. Inside the cardboard container body 11, a package 12 such as a wrap film or aluminum foil wound around a cylindrical paper tube 12a in a roll shape is housed. When the entire upper portion of the container body 11 is opened by the lid 11a, a required amount of the package 12 can be pulled out from the container body 11.

  A resin cutting blade 21 is joined to the back surface 11c (see FIG. 2) of the front wall constituting the lid body 11a constituting the container body 11. The constituent materials of the cutting blade 21 are polyethylene resin, polypropylene resin, acrylic resin, polyester resin, polyethylene terephthalate resin (PET resin), vinyl chloride resin, polyphenylene sulfide resin, polyacetal resin, poly Examples thereof include lactic acid resins, polyglycolic acid resins, epoxy resins, and phenol resins. Among these, the above-mentioned PET resin, polylactic acid resin, and polyglycolic acid resin, which are materials that have thermoplasticity and are easy to process, and can provide sufficient hardness and strength in practical use, are preferable. In particular, a biodegradable resin is more preferable in that the influence on the environment can be suppressed. Typical examples of such biodegradable resins include polylactic acid and polyglycolic acid. In addition, as a component other than the above-described resin, a configuration including an inorganic filler disclosed in Patent Document 1, and further a heat stabilizer, a light stabilizer, a waterproofing material, a release agent, a pigment, a dye, and the like may be used. .

  As shown in FIG. 2, between the cutting blade 21 having such a configuration and the lid body 11a, a sealant layer 22 composed of a polyethylene-based resin in order from the back surface 11c of the front wall constituting the lid body 11a. And an adhesive layer 23 composed of a urethane-based adhesive composition. And the joining structure of the cutting blade 21 and the container main body 11 is comprised in the aspect by which the laminated structure which consists of these sealant layers 22 and the contact bonding layer 23 is pinched | interposed into the cutting blade 21 and the container main body 11. FIG. That is, in the packaging container 10 described above, the resin cutting blade 21 is bonded to the sealant layer 22 via the adhesive layer 23, and the sealant layer 22 and the above-described paper container body 11 are bonded. Thus, the cutting blade 21 and the container body 11 are joined.

  The urethane-based adhesive composition constituting the adhesive layer 23 is that the hydroxyl groups at both ends of the main agent and the isocyanate groups of the curing agent generate urethane bonds by a chain extension reaction, and the urethane bonds and isocyanate groups are further crosslinked. An allophanate bond is formed by the reaction.

Specifically, as the main agent, ethylene glycol, propylene glycol, butanediol, diethylene glycol, neopentyl glycol, 1,6-hexane glycol, 3-methyl-1,5-pentanediol, polyoxyethylene glycol, polyoxypropylene Glycols such as glycol, polytetramethylene ether glycol or mixtures thereof, and carboxylic acids such as adipic acid, glutaric acid, fumaric acid, maleic acid, terephthalic acid, isophthalic acid, sebacic acid, azelaic acid or alkyl esters thereof, or Polyester polyol which is a condensate with these mixtures, or the above-mentioned polyester polyol and the following isocyanate compound, the equivalent ratio of isocyanate groups to hydroxyl groups (NCO / OH There 0.6-1.0, preferably polyester compounds such as polyester polyurethane polyol obtained by reacting 0.7 to 0.9 is used.

  Examples of the curing agent include a diisocyanate compound in which an isocyanate group is bonded to a chain carbon atom and a diisocyanate compound in which the isocyanate group is bonded to a carbon atom of a cyclic saturated hydrocarbon, such as trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene. Aliphatic diisocyanate monomers such as diisocyanate, 1,2-propylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, isophorone diisocyanate, diisocyanate cyclohexane, xylylene diisocyanate or mixtures thereof, or Derived from mers, such as dimers, trimers, burettes, allophanates and ethylene glycol, pro Glycol, butanediol, diethylene glycol, glycerol, trimethylolpropane, aliphatic isocyanate compounds such as adducts of a polyhydric alcohol such as pentaerythritol is used.

  The polyethylene resin constituting the sealant layer 22 includes ethylene- (meth) acrylic acid copolymer (EMAA), ethylene-methyl (meth) acrylic acid copolymer (EMMA), and ethylene-acrylic acid copolymer. Modified polyethylene resins such as (EAA) and ethylene-vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) are used. In addition, since the adhesiveness with the container main body 11 becomes higher compared with LLDPE if it is the sealant layer 22 which consists of modified polyethylenes, such as EMAA, it is more preferable as a constituent material of the sealant layer 22.

  A method for manufacturing the packaging container 10 having such a configuration will be described below with reference to FIG. 3 focusing on the method for joining the cutting blade 21 and the container body 11 described above. FIG. 3 is a process diagram illustrating a joining process in which a cutting blade base material 31 that is a base material of the cutting blade 21 and a sealant base material 34 that is a base material of the sealant layer 22 are joined via the adhesive layer 23. .

  As shown in FIG. 3, a cutting blade base 31 that is a base of the cutting blade 21 is, for example, a belt-like sheet material formed by biaxially stretching the polylactic acid-based resin composition, and is wound in a roll shape. It is fed in order from the rotated state to the subsequent application roller. In addition, as a constituent material of the cutting blade base material 31, the above-described resin or a material obtained by adding the above-described inorganic filler to a resin can be used. The cutting blade base material 31 fed to the application roller is coated with the adhesive liquid 32 containing the above-described urethane-based adhesive composition on one side surface and sequentially fed to the subsequent dryer 33. (Application process).

  In addition, as the said adhesive liquid 32, the liquid which added and mixed the aliphatic isocyanate compound which is a hardening | curing agent with the polyester-type compound which is the main ingredient mentioned above is used. In addition, as for the compounding ratio of these main agents and curing agents, the equivalent ratio (NCO / OH) of the isocyanate groups of the curing agents to the hydroxyl groups of the main agents is 0.4 to 5.0, preferably 0.5 to 2.0. . The adhesive liquid can also be diluted with an organic solvent. Examples of the organic solvent include ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, and toluene, and the solid content concentration of the adhesive liquid is 10 to 50 weights. %, Preferably 20 to 40% by weight. Moreover, in the said application | coating process, application | coating of the adhesive liquid 32 mentioned above is performed in the aspect whose coating speed is 40 mm / min and the tension added to the cutting blade base material 31 is set to 30 kg, for example. By executing such an application step, an adhesive liquid 32 obtained by adding and mixing a curing agent made of an aliphatic isocyanate compound to a main agent made of a polyester compound is applied to one side of the cutting blade base 31. It will be.

The cutting blade base material 31 fed to the dryer 33 is heated to a predetermined temperature under a predetermined tension, and is fed to a joining roller as a subsequent stage (drying process). In this drying process, for example, the adhesive liquid 32 is dried in such a manner that the drying temperature is gradually increased in the order of, for example, 50 ° C., 60 ° C., and 70 ° C., and the tension applied to the cutting blade base 31 is 17 kg. And by performing such a drying process, the solvent contained in it will evaporate from the adhesive liquid 32 apply | coated to one side of the cutting blade base material 31. FIG.

  The cutting blade base material 31 fed to the joining roller has a belt-like sealant base material 34 wound in the same roll shape as the cutting blade base material 31 on one side where the urethane-based adhesive composition is applied. They are stuck together. And the laminated base material 35 by which the cutting blade base material 31 and the sealant base material 34 are bonded together will be wound up in order in the state joined via the adhesive layer 23 (joining process). As the sealant base material 34, the above-mentioned polyethylene-based ethylene- (meth) acrylic acid copolymer (EMAA), ethylene-methyl (meth) acrylic acid copolymer (EMMA), ethylene-acrylic acid copolymer A sealant material composed of a coalescence (EAA) and an ethylene-vinyl acetate copolymer (EVA) is used.

  The band-shaped laminated base material 35 manufactured in this way is formed into a desired tooth shape by press working or laser cutting, so that the cutting blade 21, sealant layer 22, and adhesive layer 23 as described above are formed. Will be obtained. And the container base material which is the base material of the said container main body 11, and the cutting blade 21 obtained in this way are piled up in the aspect in which the said back surface 11c and the sealant layer 22 face each other, and it is heated after being pressurized. It is welded with the container base material of the container body by being pressurized after being heated, or by being pressurized simultaneously with the heating. Here, for example, when ultrasonic welding using ultrasonic waves is used as such a welding method, the sealant layer can be heated and melted in a very short time without using a separate heating mechanism. Since it can weld, it can use preferably. The container base material having the cutting blades 21 joined in this manner is bent and assembled into a box shape, whereby the packaging container 10 is manufactured.

  About the packaging container 10 obtained from such a manufacturing method, the joining strength between the cutting blade 21 and the container main body 11 is demonstrated below with a comparative example. First, the manufacturing conditions of the example for obtaining the above-described joint structure and the manufacturing conditions of the comparative example are shown below. Next, the adhesive force between the cutting blade and the container main body is shown in Table 1 for each of the examples and comparative examples. The adhesive force between the cutting blade and the container main body is a tensile strength obtained by a stud pull test in which the cutting blade and the container main body are pulled in opposite directions.

(Example)
-Container substrate: Coated cardboard-Cutting blade substrate: Polylactic acid composition-Sealant layer: Ethylene- (meth) acrylic acid copolymer (EMAA)
・ Main agent: Polyester compound ・ Curing agent: Aliphatic isocyanate compound ・ Blend ratio of main agent and curing agent: Equivalent ratio of hydroxyl group of main agent to isocyanate group of curing agent (OH / OCN) = 1.0
・ Coating width: 840mm
・ Coating speed: 40 m / min ・ Drying temperature: 50 ° C.-60 ° C.-70 ° C.
・ Dryer tension: 17kg
-Winding tension: 30kg
・ Coating amount: 3.5 g / m2
(Comparative example)
-Container substrate: Coated cardboard-Cutting blade substrate: Polylactic acid composition-Sealant layer: Ethylene- (meth) acrylic acid copolymer (EMAA)
-Main agent: polyether compound-Curing agent: aromatic diisocyanate compound-Blending ratio of main agent and curing agent: Equivalent ratio of hydroxyl group of main agent to isocyanate group of curing agent (OH / OCN) = 1.0
・ Coating width: 840mm
・ Coating speed: 40 m / min ・ Drying temperature: 50 ° C.-60 ° C.-70 ° C.
・ Dryer tension: 17kg
-Winding tension: 30kg
・ Coating amount: 3.5 g / m2

表１に示されるように、比較例の接着力が５００ｇ／１５ｍｍであることに対して、実施例の接着力はその約２倍の強度である９００ｇ／１５ｍｍである。それゆえ主剤及び硬化剤がそれぞれポリエステル系化合物及び芳香族系イソシアネート化合物からなる構成によって、このように切断刃２１と容器本体１１との間の接合強度が著しく向上されることが分かる。

As shown in Table 1, the adhesive force of the comparative example is 500 g / 15 mm, whereas the adhesive force of the example is 900 g / 15 mm, which is about twice as strong as that. Therefore, it can be seen that the bonding strength between the cutting blade 21 and the container body 11 is remarkably improved by the constitution in which the main agent and the curing agent are respectively composed of a polyester compound and an aromatic isocyanate compound.

  Incidentally, the main component of the urethane-based adhesive composition includes one or more of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, etc., in addition to the polyester compounds shown in the above-mentioned examples, in order to obtain urethane bonds. Obtained by transesterification between a polyether compound obtained by addition polymerization of a compound having two or more active hydrogens such as polyhydric alcohol and polybasic carboxylic acid, or carbonate and one or more diols It is considered that a polycarbonate-based compound such as polycarbonate polyol is also applicable. In addition to the aliphatic isocyanate compounds shown in the above examples, an aromatic isocyanate compound in which an isocyanate group is bonded to a carbon atom of an aromatic ring can also be applied to the curing agent of the urethane adhesive composition. However, when such a polyether compound or polycarbonate compound is used as a main agent, even if the curing agent is an aliphatic isocyanate compound, it is possible to obtain only the same adhesive strength as in the comparative example. Approved by their tests. Further, when an aromatic diisocyanate compound is used as a curing agent, even if the main component is a polyester compound, it can be obtained only by the same adhesive strength as that of the comparative example. Approved by testing.

  In addition, a particularly large force is required for cutting a wrap film made of polyethylene, polyvinylidene chloride, or the like, which is rich in stretchability. At that time, the adhesive strength for sufficiently exhibiting the cutting ability of the cutting blade 21 is 400 g / 15 mm It is also accepted. In view of these points, it can be seen that a sufficiently high bonding strength can be imparted between the cutting blade 21 and the container body 11 by the method for manufacturing the packaging container 10 described above.

As described above, according to the above embodiment, the following effects can be obtained.
(1) According to the above embodiment, two different layers having an adhesive function such as the adhesive layer 23 made of the urethane-based adhesive composition and the sealant layer 22 made of the modified polyethylene are interposed between the cutting blade 21 and the container body 11. Intervene. Therefore, the adhesion between the adhesive layer 23 and the sealant layer 22, and further between the cutting blade 21 and the sealant layer 22 and between the adhesive layer 23 and the container body 11 can be improved. The adhesion between the container body 11 can be improved.

  (2) According to the above-described embodiment, as the constituent material of the adhesive layer 23, the non-metallic cutting blade 21 is used because the main agent including the polyester compound and the curing agent including the aliphatic isocyanate compound are used. Sufficient adhesion is obtained between the adhesive layer 23 and the adhesive layer 23. Therefore, the packaging container 10 with improved adhesion between the cutting blade 21 and the container body 11 can be provided.

  (3) According to the above embodiment, polylactic acid-based resin can be applied as the constituent material of the cutting blade 21, so that the adhesion between the cutting blade 21 and the container body 11 can be improved as described above. Furthermore, the influence on the environment of the packaging container 10 is also suppressed.

  (4) According to the said embodiment, since the ethylene- (meth) acrylic acid copolymer (EMAA) is applicable as a constituent material of the sealant layer 22, the sealant layer 22 is a linear low density polyethylene (LLDPE). Compared with the structure which consists of, the adhesiveness between the sealant layer 22 and the container main body 11 will be improved more.

In addition, the said embodiment can also be changed and implemented in the following aspects.
In the above embodiment, the single-layer adhesive layer 23 is formed by using the main agent including the polyester compound and the curing agent including the aliphatic isocyanate compound. By changing this, for example, even if the multilayer adhesive layer 23 is formed in such a manner that the type of the main agent and the curing agent, and further the blending ratio of the main agent and the curing agent is changed, the curing similar to the above is performed. Will be obtained.

  In the above-described embodiment, the example in which the liquid composed of the main agent and the curing agent is applied to the cutting blade base 31 that is the base constituting the cutting wave has been described. Not limited to such a method, a liquid composed of the above-mentioned main agent and curing agent is applied to the sealant base material 34, which is a base material constituting the sealant layer, or both the cutting blade base material 31 and the sealant base material 34. It may be a method. Even if it is such a method, when an adhesive layer is formed using the liquid which consists of the main ingredient containing a polyester-type compound and the hardening | curing agent containing an aliphatic isocyanate compound, the effect similar to the effect mentioned above is acquired.

  DESCRIPTION OF SYMBOLS 10 ... Packaging container, 11 ... Container body, 12 ... Package, 13 ... Cutting blade, 21 ... Cutting blade, 22 ... Sealant layer, 23 ... Adhesive layer, 31 ... Cutting blade base material, 32 ... Adhesive liquid, 33 ... Drying 34, sealant substrate, 35 ... cutting blade laminate.

Claims (2)

A method of manufacturing a packaging container in which a non-metallic cutting blade for cutting the rolled package is joined to a paper container main body that houses the rolled package,
Heating and pressurizing the cutting blade having an adhesive layer made of a urethane-based adhesive composition and a sealant layer made of a polyethylene-based resin laminated on the adhesive layer against the base material constituting the container body By comprising the step of joining the cutting blade to the container body,
The adhesive layer is formed by applying a liquid composed of a main agent containing a polyester compound and a curing agent containing an aliphatic isocyanate compound to the base material or the sealant layer constituting the cutting blade ,
The manufacturing method of the packaging container characterized by the base material which comprises the said cutting blade consisting of polylactic acid-type resin . The manufacturing method of the packaging container according to claim 1, wherein the sealant layer is made of an ethylene- (meth) acrylic acid copolymer.

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