JP6568669B2 - Packaging container - Google Patents

Description

  The present invention relates to a packaging container. In more detail, it is related with the packaging container which accommodates a wrap film.

  Conventionally, a packaging container in which a varnish is applied to a front plate of a packaging container main body is known as a packaging container in which a wrap roll is placed. Since the varnish is applied to the front plate of the packaging container body, the drawn wrap film can be sufficiently brought into close contact with the front plate and locked, and the wrap film can be easily cut. Furthermore, after cutting, the wrap film can be prevented from winding back to the wrap roll side, and the wrap film can be easily pulled out when used next time.

  For example, Patent Document 1 discloses a packaging container having a varnish coating layer for temporarily fixing a wrap film, wherein the shear strength and T-peel strength of the varnish coating layer with respect to the wrap film are defined.

Japanese Published Patent Publication “Japanese Patent Laid-Open No. 2014-5079”

  However, if the strength of adhesion of the wrap film to the varnish coating layer is too strong, the wrap film becomes difficult to pick up when the wrap film is pulled out again, and it tends to cause problems such as tearing and vertical tearing. In addition, the strength of adhesion of the wrap film to the varnish coating layer increases with time. For this reason, if the elapsed time until the wrap film is drawn out again for a long period of time, the above-described problem is more likely to occur.

  Therefore, an object of the present invention is to provide a packaging container in which the ease of pinching hardly changes with time, and the ease of pinching can be maintained.

  In order to solve the above-described problems, a packaging container according to the present invention is a packaging that includes a wrap film wound body, a container body that has an open top surface, and a lid that is connected to the rear plate of the container body. In the container, a varnish coating layer is provided on the front plate of the container body, and the varnish coating layer satisfies the following condition 1.

(Condition 1)
JIS Z-0237: 2009 T-type peel strength measured immediately after application of the wrap film in the T-type peel strength measured using a 25 mm wide varnish coating layer sample piece and a wrap film according to "Testing method for adhesive tape / adhesive sheet" T _i and the T-type peel strength T _3d 3 days after application satisfy {(T _3d −T _i ) / T _i } × 100 ≦ 50.

  According to the present invention, it is possible to provide a packaging container in which the ease of pinching of a wrap film is unlikely to change over time and the ease of pinching can be maintained.

It is a perspective view which shows an example of the packaging container which concerns on this embodiment. It is a rear view which shows the cover front plate and cutting blade of the packaging container which concern on this invention. It is a front view of the front board which shows the varnish application layer of the packaging container concerning the present invention.

  Hereinafter, an embodiment of the packaging container of the present invention will be specifically described.

  FIG. 1 is a perspective view showing a packaging container according to this embodiment. The packaging container 100 is a box for storing a wrap roll (wrap film wound body) 1 in which the wrap film 2 is wound in a roll shape with the axial direction of the wrap roll 1 parallel to the longitudinal direction of the packaging container 100. Container. The packaging container 100 includes a container body 11 and a lid body 21. Although details will be described later, the container body 11 is provided with a flap 51 and a varnish coating layer 31, and the lid body 21 is provided with a cutting blade 41. In addition, although the packaging container 100 in this embodiment is a carton formed with paperboard, a raw material and a shape are not limited to this. For example, plastic other than paper may be used. Further, the shape may be a cylindrical shape other than the box shape.

(Container body)
The container body 11 is a box-shaped container having an open top surface, and has a rectangular parallelepiped shape with a bottom surface. The container body 11 includes a bottom plate 12, a front plate 13, a rear plate 14, a side plate 15a, and a side plate 15b. The front plate 13 and the rear plate 14 are erected on the long side of the bottom plate 12. The side plates 15 a and 15 b are erected on the short side of the bottom plate 12. The front plate 13 is connected to each of the side plates 15a and 15b, and the rear plate 14 is also connected to each of the side plates 15a and 15b, so that the front plate 13, the side plate 15a, the rear plate 14 and the side are connected. The face plate 15b is continuous. The container body 11 has an open top surface and forms an opening 16.

(Lid)
The lid body 21 is a lid that is connected to the rear plate 14 of the container body 11 and covers the opening 16 on the upper surface of the container body 11 so as to be freely opened and closed. The lid body 21 includes a lid top plate 22, a lid front plate 23, and lid side plates 24a and 24b. The lid top plate 22 is connected to the upper side 14 a of the rear plate 14 of the container body 11 at one long side. When the lid 21 is closed, the opening 16 on the upper surface of the container body 11 is covered by the lid top plate 22. The lid front plate 23 is connected to the other long side of the lid top plate 22. The lid side plates 24 a and 24 b are connected to the short sides of the lid top plate 22. In the present embodiment, the lid front plate 23 is configured to cover a portion of the front plate 13 of the container body 11 when the lid 21 is closed. Therefore, when the wrap film 2 is pulled out and the lid body 21 is closed, the wrap film 2 is placed between the lid front plate 23 and the front plate 13 of the container main body 11 at a portion where the lid front plate 23 covers the front plate 13 of the container main body 11. It will be sandwiched. Further, in the present embodiment, when the lid body 21 is closed, the lid side plates 24a and 24b are configured to cover parts of the side plates 15a and 15b, respectively.

(Varnish coating layer)
A varnish coating layer 31 is provided on the front plate 13 of the container body 11. The varnish coating layer 31 is provided to bring the drawn wrap film 2 into close contact with the front plate 13 and lock it. When the lid 21 is closed, the wrap film 2 adheres to the varnish coating layer 31. Therefore, when the lid 21 is closed and cut, the wrap film 2 can be reliably locked, and the wrap film 2 can be easily cut. Further, it is possible to prevent the drawn wrap film 2 from being rewound onto the wrap roll 1 after the wrap film 2 is cut. The varnish coating layer 31 is provided so as to come into contact with the wrap film 2 when the wrap film 2 is sandwiched between the lid front plate 23 and the front plate 13 when the lid 21 is closed.

  FIG. 3 shows one mode of the pattern of the varnish coating layer 31. As shown in FIG. 3, the varnish coating layer 31 is provided at the center varnish coating layer 31 a provided at the center of the upper side of the front plate 13 (opening side of the container body), and at the end in the longitudinal direction on the upper side of the front plate 13. The end varnish coating layer 31b is formed, and a flap varnish coating layer 31c provided on a flap 51 to be described later.

  The varnish coating layer 31 has a T-type peel strength that satisfies the following condition 1 with respect to the wrap film 2.

(Condition 1)
JIS Z-0237: 2009 T-type peel strength measured immediately after application of the wrap film in the T-type peel strength measured using a 25 mm wide varnish coating layer sample piece and a wrap film according to "Testing method for adhesive tape / adhesive sheet" T _i and the T-type peel strength T _3d 3 days after application satisfy {(T _3d −T _i ) / T _i } × 100 ≦ 50.

  The above formula represents that the increase rate of the T-type peel strength after 3 days from the sticking to the T-type peel strength immediately after the lap film is pasted is 50% or less.

  In this embodiment, the T-type peel strength between the sample piece and the wrap film means the peel strength when the wrap film 2 in close contact with the varnish coating layer 31 is pulled vertically with respect to the varnish coating layer 31. . Specifically, it corresponds to the 90 ° peeling adhesion in the above-mentioned JIS Z-0237: 2009. Detailed test conditions are as in Examples described later.

  When the T-type peel strength in the varnish coating layer 31 satisfies the above condition 1, the increase in adhesion strength is small even after a long time elapses after the wrap film is pulled out and cut and then pulled out again. Therefore, the ease of pinching of the wrap film 2 is less likely to change with time, and the ease of pinching can be maintained. As a result, it is less likely to lead to problems such as tearing and vertical tearing.

  Furthermore, the varnish coating layer 31 in the present embodiment has a T-type peel strength that satisfies the following condition 2 with respect to the wrap film 2.

(Condition 2)
The T-type peel strength T _i immediately after the wrap film is pasted is 4.0 × 10 ⁻² N / 25 mm or less.

By T-peel strength T _i satisfies the above condition 2, the adhesion of the varnish coating layer 31 of cling film 2 drawn is, the wrap film 2 from or paste immediately after brought into close contact with the varnishing layer 31 3 Even after days, it can be prevented from becoming too strong.

  Therefore, even when the wrap film 2 is pulled out immediately after cutting the wrap film 2 or after 3 days from the pasting, the wrap film 2 can be easily picked, and as a result, problems such as tearing and vertical tearing are reduced.

Wrap film paste immediately after the T-peel strength _{T i} is, 4.0 × and a ¹⁰ -2 N / 25 mm or less, preferably 3.5 × ¹⁰ -2 N / 25mm or less, 2.5 × 10 ^-2 N / 25 mm or less is more preferable. If the T-type peel strength _Ti is 3.5 × 10 ⁻² N / 25 mm or less, even if varnish is applied to the front plate over a wide range, the T-type peel strength is low, so it is easy to pinch and suppress problems such as tearing. Can provide easy-to-use packaging containers. If the T-type peel strength _Ti is 2.5 × 10 ⁻² N / 25 mm or less, the T-type peel strength immediately after pasting the wrap film is low. The mold peel strength can be maintained.

  Therefore, even when the wrap film 2 is pulled out immediately after cutting the wrap film 2 or after three days from the pasting, the wrap film 2 is easily picked up, and as a result, it is less likely to cause problems such as tearing and vertical tearing.

  The T-type peel strength of the varnish coating layer 31 with respect to the wrap film 2 is determined by the film forming conditions such as the UV irradiation amount and drying speed of the varnish coating layer 31, the plate depth of the varnish coating layer 31, the pattern of the varnish coating layer 31, It can be adjusted by adjusting.

  The varnish coating layer 31 is not limited to the pattern as shown in FIG. 3 and may be another pattern. For example, the pattern described in Patent Document 1 may be used.

  In the examples described later, in the T-type peel strength test, the central varnish coating layer 31a is used as the varnish coating layer 31, but other varnish coating layers may be used as long as the varnish coating layer 31 is used. Good. For example, instead of the varnish coating layer 31a, a region where the varnish coating layer 31c exists continuously over the entire measurement width may be selected and used. In the case where there is no region where the varnish coating layer is continuously present over the entire width of measurement, such that varnish coating portions and varnish non-coating portions are alternately present, the entire varnish coating pattern formed by a plurality of varnish coating portions And the part surrounded by the outline may be regarded as the varnish application part. Moreover, what is necessary is just to regard the part which a varnish application part surrounds as a varnish application part when the varnish non-application part is surrounded by the varnish application part. In addition, when the predetermined width (25 mm in the Example mentioned later) of a measurement area is not obtained, the conversion at the time of setting to a predetermined width should just be performed based on a measured value.

  Moreover, in the Example mentioned later, although the varnish application layer 31 is performing various evaluation using the thing of a pattern as shown in FIG. 3, of course, even if it evaluates using the thing of another application pattern, Good.

(varnish)
The varnish used for the varnish coating layer is an active energy ray-curable resin composition that is radically polymerized and cured by active energy rays such as ultraviolet rays and electron beams, and includes an active energy ray-curable resin. The active energy ray-curable resin contains a compound having an ethylenically unsaturated double bond. Hereinafter, the ultraviolet curable resin composition and the ultraviolet curable resin which are radically polymerized and cured by ultraviolet irradiation will be described.

  An ultraviolet curable resin consists of an oligomer or a monomer, or an oligomer and a monomer.

  The oligomer imparts resistance and flexibility to the varnish coating layer, and examples thereof include urethane acrylate having a (meth) acrylate group, polyester acrylate, acrylic acrylate, and epoxy acrylate.

  The monomer is added for the purpose of improving the physical properties of the varnish coating layer and adjusting the viscosity of the ultraviolet curable resin composition, and examples thereof include monofunctional, bifunctional and polyfunctional monomers having a (meth) acrylate group. .

  Monofunctional monomers include 2- (2-ethoxyethoxy) ethyl acrylate, stearyl acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, 2-phenoxyethyl acrylate, indecyl acrylate, isooctyl acrylate, tridecyl acrylate, caprolactone acrylate, 4 -Hydroxybutyl acrylate, ethoxylated noniphenol acrylate, propoxylated nonylphenol acrylate, phenoxyethyl acrylate, phenoxydiethylene acrylate, ethylene oxide modified nonylphenyl acrylate, methoxytriethylene glycol acrylate, ethylene oxide 2-ethylhexyl acrylate, isobornyl acrylate and di Propylene glycol Rate, and the like as well as those methacrylate monomers.

  Bifunctional monomers include 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, neopentyl glycol diacrylate, propoxylated neopentyl glycol diacrylate, and ethoxylation Neopentyl glycol diacrylate, hydroxypivalate neopentyl glycol diacrylate, (hydrogenated) bisphenol A diacrylate, (hydrogenated) ethylene oxide modified bisphenol A diacrylate, (hydrogenated) propylene glycol modified bisphenol A diacrylate, 1, 6-hexanediol diacrylate, 2-ethyl, 2-butyl-propanediol diacrylate and 1,9-nonanediol Acrylate as well as those methacrylate monomers.

  Examples of polyfunctional monomers include tris (2-hydroxyethyl) isocyanurate triacrylate, ethylene oxide modified trimethylolpropane triacrylate, propylene oxide modified trimethylolpropane triacrylate, propylene oxide modified glyceryl triacrylate, pentaerythritol triacrylate, trimethylol. Propane acrylate, ethylene oxide modified trimethylolpropane acrylate, propylene oxide modified trimethylolpropane acrylate, tris (acryloxyethyl) isocyanurate, pentaerythritol tetraacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol hydroxypentaacrylate, ethoxylated pentaerythris Lito Le tetraacrylate, pentaacrylate esters and dipentaerythritol hexaacrylate as well as those methacrylate monomer thereof.

  In the ultraviolet curable resin, the oligomer is preferably 0 to 80% by weight and the monomer is preferably 20 to 100% by weight in view of film physical properties.

  When the radically polymerizable crosslinking component is crosslinked with ultraviolet rays, acetophenones, benzophenones, thioxanthones, aromatic diazonium salts, metallocenes, and the like can be used as photopolymerization initiators. Moreover, it is also possible to use a polymerization accelerator together, and examples of the polymerization accelerator include amines and phosphines.

  The ultraviolet curable resin composition can be further blended with an organic / inorganic filler as necessary, and can impart gloss adjustment and wear properties. Examples of organic fillers include resins such as epoxy resins, melamine resins, urea resins, acrylic resins, polyimide resins, Teflon (registered trademark) resins, polyethylene resins, polyester resins, polyester resins, and polyamide resins until they are insoluble in solvents. Examples thereof include organic fillers that have been polymerized into fine particles. Examples of the inorganic filler include alumina, talc, magnesium carbonate, calcium carbonate, natural mica, synthetic mica, aluminum hydroxide, precipitated barium sulfate, precipitated barium carbonate, barium titanate, and barium sulfate.

  The ultraviolet curable resin composition can be blended with a colorant and various additives such as a leveling agent and an antifoaming agent as necessary, and the additive is not particularly limited, such as a silicone type and a polymer type.

  The varnish used for the varnish coating layer is preferably added with a modified vegetable oil such as epoxidized soybean oil at a ratio of 8% or less in order to impart appropriate adhesion and peelability between the wrap film and the varnish. .

(UV curing method)
As a method of curing the ultraviolet curable resin composition by ultraviolet irradiation, a high pressure mercury lamp, ultrahigh pressure mercury lamp, carbon arc lamp, metal halide lamp, xenon lamp, chemical lamp, electrodeless discharge lamp that emits light in a wavelength range of 150 to 450 nm. and using the LED or the like, 30~5000mJ / cm ^2, may be preferably 100~1000mJ / cm ² irradiation. After the ultraviolet irradiation, it can be cured completely by heating the ultraviolet curable resin composition as necessary. As a film thickness (film thickness after curing) when applying the ultraviolet curable resin composition, it is usually preferably 1 to 80 μm, more preferably 3 to 60 μm, and more preferably 5 to 50 μm. Is particularly preferred. When the film thickness is in the range of 1 to 80 μm, there is no curing inhibition, the ultraviolet irradiation time can be shortened, and the productivity is good. Moreover, from the viewpoint of improving the smoothness and glossiness of the coating film surface, it is preferable to adjust the coating conditions so that the film thickness when the ultraviolet curable resin composition is applied is 10 μm or more.

(Cutting blade)
The lid front plate 23 of the lid body 21 is provided with a plate-shaped cutting blade 41 for cutting the drawn wrap film 2. As shown in FIG. 1, the cutting blade 41 is provided over the entire width of the side opposite to the side connected to the lid top plate 22 of the lid front plate 23. The cutting blade 41 is affixed to the inside of the lid front plate 23 such that the blade portion protrudes outward from the lid front plate 23. By pulling out the wrap film 2 and closing the lid 21, the wrap film 2 is sandwiched between the front plate 13 and the lid front plate 23 of the container body 11. Can be fixed to. At that time, the cutting blade 41 comes into contact with the wrap film 2.

  FIG. 2 is a view of the lid front plate 23 as seen from the back side. As shown in FIG. 2, the cutting blade 41 is attached to the inner surface of the lid front plate 23 in the lid 21, and the surface opposite to the side attached to the lid front plate 23 is exposed. Hereinafter, the surface on this side is referred to as an exposed surface of the cutting blade 41. The exposed surface of the cutting blade 41 is a surface facing the outer surface of the front plate 13 of the container body 11 when the upper opening of the container body 11 is closed by the lid 21. That is, the surface is in contact with the wrap film 2 when the wrap film 2 is pulled out and the lid 21 is closed.

  The surface in contact with the wrap film 2 when the wrap film 2 is cut in the cutting blade 41 has a shear strength that satisfies the following condition 3 with respect to the wrap film.

(Condition 3)
The shear strength immediately after adhering the 25 mm wide cutting blade sample piece and the wrap film measured according to JIS Z-0237: 2009 “Adhesive tape / adhesive sheet test method” is 0.1 N / 25 mm or less.

  In this embodiment, the shear strength between the cutting blade 41 and the wrap film 2 means the strength when the wrap film 2 brought into close contact with the cutting blade 41 is shifted parallel (shear direction) to the cutting blade 41. . Specifically, it corresponds to the 180 ° peeling adhesive strength in the above-mentioned JIS Z-0237: 2009. Detailed test conditions are as in Examples described later. When the shear strength of the exposed surface of the cutting blade 41 with respect to the wrap film 2 is high, when the lid 21 is opened to pinch the wrap film 2, the wrap film 2 is pulled toward the cutting blade 41, and the wrap film 2 may peel off from the varnish coating layer 31. When the wrap film 2 is in close contact with the exposed surface of the cutting blade 41, it is difficult to pinch the wrap film 2 as compared with the case where it is in close contact with the varnish coating layer 31. Alternatively, the wrap film 2 may be rewound onto the wrap roll 1 when the wrap film 2 is peeled off from the varnish coating layer 31.

  When the condition 3 is satisfied, the adhesive strength of the wrap film 2 at the cutting blade 41 is not too strong. After the wrap film 2 is cut, the wrap film 21 is opened when the lid body 21 is opened to draw the wrap film 2 next time. It is possible to prevent the film 2 from being pulled toward the cutting blade 41 and peeled off from the varnish coating layer 31, and as a result, it is possible to maintain a state in which the wrap film 2 can be easily pinched. The exposed surface of the cutting blade 41 is preferably roughened so that the entire surface, at least the central region, satisfies the shear strength of the condition 3 so that the cutting blade 41 has a shear strength satisfying the condition 3 with respect to the wrap film 2. Processing has been applied. The central region extends uniformly from the center in the length direction of the cutting blade 41 to both sides thereof, and has a length of 5% or more and 50% or less with respect to the total length of the cutting blade 41 in the length direction of the cutting blade 41. Is preferred. By roughening the exposed surface of the cutting blade 41, the shear strength of the wrap film 2 with respect to the cutting blade 41 is reduced, and the wrap film 2 is difficult to stick to the cutting blade 41. Therefore, when the lid is opened again and the wrap film 2 is pulled out, the wrap film 2 can be prevented from being peeled off from the varnish coating layer 31 and sticking to the cutting blade 41 side. Become.

  Regarding the surface roughness of the cutting blade 41, the arithmetic average roughness Ra is preferably 0.1 μm or more and less than 0.4 μm, more preferably 0.15 μm or more and 0.3 μm or less. Further, the maximum height Rz of the cutting blade 41 is preferably 1.0 μm or more and 2.5 μm or less. The arithmetic average roughness Ra and the maximum height Rz are values calculated by a method based on JIS B 0601: 2001.

  In order to obtain an appropriate rough surface state, there are a method of adding an additive component to the blade material and roughening, a method of roughening the exposed surface, and the like. Further, other processing methods may be used as long as the roughening treatment is possible. When the entire surface of the exposed surface, at least the central region, is subjected to a surface roughening treatment that satisfies the shear strength of Condition 3, the wrap film 2 is cut when the center portion of the packaging container 100 is gripped and the wrap film 2 is cut. It can prevent that the wrap film 2 peels from the varnish application layer 31 by closely_contact | adhering to a material, and the wrap film 2 winds back to the wrap roll 1. FIG.

When the shear strength immediately after bonding of the cutting blade 41 and the wrap film 2 is 0.1 N / 25 mm or less, the wrap film 2 is in close contact with the exposed surface of the cutting blade 41, and the wrap film 2 is rewound onto the wrap roll 1. Can be prevented. Usually, when the shear strength immediately after pasting the cutting blade and the wrap film is high, the wrap film comes into close contact with the cutting blade, and the wrap film easily rewinds to the wrap roll when the lid is opened. On the other hand, in the varnish coating layer, when the T-type peel strength immediately after pasting the varnish coat layer and the wrap film and the increase rate of the T-type peel strength 3 days after the pasting are 50% or more, or the T-type just after pasting When the peel strength is 4.0 × 10 ⁻² N / 25 mm or more, even if the shear strength immediately after the cutting blade 41 and the wrap film 2 are attached is high, the T-type peel of the varnish coating layer Since the strength is high, the wrap film adheres to the varnish coating layer and is prevented from adhering to the cutting blade side. However, the increase rate of the T-type peel strength is 50% or more, or the varnish coating layer has a T-type peel strength of 4.0 × 10 ⁻² N / 25 mm or more immediately after the wrap film is pasted on the varnish coating layer. As described above, problems such as difficulty, tearing and vertical tearing of the knob are likely to occur. Therefore, the cutting blade exposed surface and the wrap film are attached using a varnish coating layer in which the increase rate of the T-type peel strength after 3 days from the attachment to the T-type peel strength immediately after the wrap film is attached is 50% or less. By setting the shear strength immediately after to be 0.1 N / 25 mm or less, the wrap film adheres to the exposed surface of the cutting blade when the lid is opened, and the wrap film is prevented from rewinding to the wrap roll. Can do. If the varnish coating layer has an increase rate of T-type peel strength of 50% or less after 3 days from sticking to the T-type peel strength immediately after the wrap film is pasted, problems such as difficulty in gripping, tearing and vertical tearing will occur. Can be suppressed. Furthermore, since the wrap film is properly adhered to the varnish coating layer at the time of cutting the wrap film, even if the shear strength between the exposed surface of the cutting blade and the wrap film is a low value, good cutting is possible.

(flap)
A flap 51 is provided on a part of the upper side (opening side) of the front plate 13 of the container body 11. As shown in FIG. 3, the flap 51 is constituted by the cut line 52 and the upper side of the front plate 13 by making a cut line 52 in the front plate 13, and is a part that floats outward from the front plate 13. It is. The flap 51 is provided with a varnish coating layer 31c. When the flap 51 has the varnish coating layer 31c, the wrap film 2 is sandwiched and fixed between the lid front plate 23 and the flap 51 having the varnish coating layer 31c when the wrap film 2 is cut. As a result, the drawn wrap film 2 is reliably locked by the varnish coating layer 31c, and the wrap film 2 is easily cut. After cutting, the wrap film 2 is in close contact with the varnish coating layer 31c. When the lid 21 is opened again, the flap 51 is lifted outward from the front plate 13, so that the wrap film 2 is easily picked up when the wrap film 2 is pulled out next time.

(Wrap film)
Examples of the wrap film include polyvinylidene chloride film, polyvinyl chloride film, polyethylene film, polypropylene film, polymethylpentene film, polyester film, and ethylene vinyl acetate copolymer film. When applied to a vinylidene-based resin wrap film, the effect of the present invention becomes more remarkable.

(Summary)
A packaging container (100) according to an embodiment of the present invention includes a container main body (11) having an open upper surface that accommodates a wrap film wound body, and a lid connected to the rear plate (14) of the container main body. In a packaging container (100) including a body (21), a varnish coating layer (31, 31a, 31b, 31c) is provided on the front plate (13) of the container body (11), and the varnish coating layer (31 , 31a, 31b, 31c) satisfy the following condition 1.

(Condition 1)
JIS Z-0237: 2009 T-type peel strength measured immediately after application of the wrap film in the T-type peel strength measured using a 25 mm wide varnish coating layer sample piece and a wrap film according to "Testing method for adhesive tape / adhesive sheet" T _i and the T-type peel strength T _3d 3 days after application satisfy {(T _3d −T _i ) / T _i } × 100 ≦ 50.

  Moreover, in the packaging container (100) which concerns on one Embodiment of this invention, it is preferable that the said varnish application layers (31, 31a, 31b, 31c) satisfy | fill the following conditions 2 further.

(Condition 2)
The T-type peel strength _Ti is 4.0 × 10 ⁻² N / 25 mm or less.

  Moreover, the packaging container (100) which concerns on one Embodiment of this invention WHEREIN: The said cover body (21) is provided with the cutting blade (41) which cut | disconnects the wrap film (2) pulled out from the said wrap film winding body. The surface of the cutting blade (41) that contacts the drawn wrap film (2) during cutting preferably satisfies the following condition 3.

(Condition 3)
The shear strength immediately after bonding of the 25 mm wide cutting blade sample piece and the wrap film measured in accordance with JIS Z-0237: 2009 “Adhesive tape / adhesive sheet test method” is 0.1 N / 25 mm or less.

  Moreover, the packaging container (100) which concerns on one Embodiment of this invention WHEREIN: The said front board (13) is provided with the flap (51) which comprises the cut line (52) formed in the said front board (13). The varnish coating layer (31c) is preferably provided on at least the front surface of the flap (51).

  Moreover, in the packaging container (100) which concerns on one Embodiment of this invention, it is preferable that the said wrap film (2) is a polyvinylidene chloride film.

  Examples will be shown below, and the embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail. Further, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and the present invention is also applied to the embodiments obtained by appropriately combining the disclosed technical means. It is included in the technical scope of the invention. Moreover, all the literatures described in this specification are used as reference.

[T-peel strength test]
The strength measured using a varnish coating layer sample piece having a width of 25 mm and a wrap film according to JIS Z-0237: 2009 “Testing method for adhesive tape / adhesive sheet” is defined as T-type peel strength.

(Preparation of sample piece of varnish coating layer)
A coating solution was prepared by mixing SP varnish (manufactured by Toyo Ink Co., Ltd.) made of an ultraviolet curable resin and a diluting solvent (manufactured by Toyo Ink Co., Ltd.) at a volume ratio of 10: 3. The SP varnish used here is an ultraviolet curable gloss varnish for flexographic printing machines. The coating solution was applied to the packaging container with a printing pattern shown in FIG. 3 at a plate depth of 40 μm, 50 μm or 60 μm. The coating film was irradiated with a high-pressure mercury lamp to cure the coating film, and a packaging container provided with a varnish coating layer was produced. The central varnish coating layer portion was cut out and used as sample pieces A to E of the varnish coating layer according to Examples 1 to 5. The cut-out central varnish coating layer portion is a portion of the central varnish coating layer 31a provided at the upper side (opening side) center of the front plate 13. The width of the cut-out was 25 mm, and the height perpendicular to the axial direction was a height at which the varnish application part could be sufficiently secured, and in this example, 20 mm. The cut varnish application pattern is solid.

  Selection of the width 25 mm of the cut-out portion was selected from an area where the varnish coating layer was present when the cut-out portion was cut. Specifically, it was selected from a region where the varnish coating layer 31a was continuously present over the entire measurement width. Finally, a double-sided tape was applied to the back surface of the sample piece (the back surface of the surface coated with SP varnish). In this embodiment, a plurality of sample pieces with a width of 25 mm are obtained from one packaging container along the axial direction, but the central part of the carton, which is a more important area for ease of use (1/2 of the total length of the carton). Evaluation is performed with a sample piece obtained from a range including a portion.

  In Examples 4 and 5, the cutting blade portion of the packaging container is changed from Example 2. Therefore, Example 2, 4 and 5 are the same regarding the varnish application layer part.

  A packaging container was produced in the same manner as in Examples 1 to 3 except that FDPCA (manufactured by Toyo Ink Co., Ltd.) was used as the SP varnish, and the UV irradiation level when the coating film was cured was increased. The plate depth was 50 μm. The central varnish coating layer portion was cut out to obtain a sample piece F of the varnish coating layer according to Comparative Example 1.

  A packaging container was produced in the same manner as in Examples 1 to 3 except that FDPCA (Toyo Ink Co., Ltd.) was used as the SP varnish, and Comparative Examples 2 to 4 were obtained. The plate depth was 40 μm, 50 μm, and 60 μm, respectively. The central varnish coating layer portion was cut out and used as varnish coating layer sample pieces G to I according to Comparative Examples 2 to 4.

(Production of film piece)
A wrap film (trade name NEW Kurewrap, manufactured by Kureha Co., Ltd.) was cut into a size of 25 mm in width and 100 mm in length. At this time, the length direction was matched with the film drawing direction. A paper tape (25 mm in width and 15 mm in length) was attached as a gripping margin to one end side in the length direction. At this time, the paper tape was pasted with the width direction of the paper tape and the width direction of the wrap film piece matched. The indoor environment was 23 ± 5 ° C. and 40 ± 20% RH.

(Press bonding of varnish coating layer and film piece)
The sample piece was placed on the iron plate so that the varnish coating layer faced upward, and fixed to the iron plate with double-sided tape. Next, among the ends in the length direction of the film piece, the end portion opposite to the end on which the paper tape is attached is applied to the varnish coating layer in a direction in which the width of the film piece is 25 mm and the width of the sample piece is 25 mm. I covered it. As a result, the entire surface of the sample piece is covered with the film piece. In addition, the surface of the film piece which closely_contact | adheres to a varnish application layer was made into the wrap lower side (surface which faces a winding core direction). Using a 2 kg roller crimping apparatus described in JIS Z-0237: 2009, the roller was rolled in the width direction of the film piece, and the film piece and the varnish coating layer were pressure-bonded to produce a measurement pressure-bonded product.

(Measurement of T-type peel strength)
The iron plate is fixed to the base so that the normal of the surface to which the sample piece is attached faces vertically upward, and the paper tape side of the film piece of the measurement pressure-bonded product is located above the iron plate. T-type peel test was conducted at a pulling speed of 300 mm / min. The test was performed several times, and the maximum value was taken as the measured value. The test was performed immediately after the film piece was attached and 3 days after the film piece was attached.

(Increase rate of T-peel strength)
A T-peel strength immediately after pasting the wrap film and T _i, the T-peel strength after 3 days Paste and T _3d, the rate of increase in T-peel strength was calculated by the formula 1 below. The results are shown in Table 1.
{(T _3d −T _i ) / T _i } × 100 Equation 1

[切断刃露出面のずり強度試験]
切断刃４１における、ラップフィルム２の切断時にラップフィルム２と接する面（露出面）とラップフィルム２とのずり強度を測定した。

[Shear strength test of exposed surface of cutting blade]
The shear strength between the surface (exposed surface) in contact with the wrap film 2 and the wrap film 2 when the wrap film 2 was cut in the cutting blade 41 was measured.

(Sample preparation)
Sample 1 containing a polylactic acid resin as a main component and a resin sheet containing a polystyrene resin as an additive at a concentration in the range of 0.5 to 50% by mass in a V shape and having a thickness of about 250 μm (implementation) The cutting blades of Examples 1-3 and Comparative Examples 1-2) were formed.

  In Sample 2 (Example 4 and Comparative Examples 3 to 4), a cutting blade was formed in the same manner as Sample 1 except that a resin sheet in which the amount of polystyrene resin as an additive was reduced was used.

  In Sample 3 (Example 5), a cutting blade was formed in the same manner as Sample 1 except that a resin sheet to which no polystyrene-based resin as an additive was added was used.

(Preparation of sample piece)
The following processes (1) to (3) were performed on each of samples 1 to 3, and sample pieces of Examples 1 to 5 and Comparative Examples 1 to 4 were produced.

  (1) A sample cut to a width of 7.5 mm × a length of 25 mm or more is attached to an iron plate with a double-sided tape so as to be parallel to the measurement direction.

  (2) The steel plate portion to which the sample is not attached is covered with paper whose surface is not polished so that the wrap film does not stick, and a film piece cut to a width of 25 mm is placed on the sample. The film piece at this time is produced in the same manner as in the T-type peel strength test. In addition, since the part which touches a cutting blade at the time of actual packaging film cutting | disconnection is a part used as the outer side of the roll of a wrap film, it arrange | positions a wrap film so that the part may contact a sample.

  (3) Using a nonwoven fabric (in this example, Kimwipe (registered trademark)), the sample and the wrap film are rubbed so as to be pressure-bonded.

(Measurement of shear strength)
The iron plate is sandwiched between the tensilon (lower side) and the paper tape side of the film piece with tensilon (upper side) so that the normal of the surface to which the sample piece is attached faces vertically upward. A sample was set in a Tensilon universal material testing machine (RTG-1210) manufactured by Day Co., and shear strength was measured in a test environment of 23 ° C., 50% RH, and a test speed of 300 mm / min to obtain an average value. The measurement results are shown in Table 2.

  The cutting blade of the packaging container used in the evaluation is a layer mainly composed of polylactic acid resin, and polystyrene resin is added at a concentration of 0.5 to 50% by mass as an additive component for roughening. The layer to be included is a cutting blade used for at least the exposed surface layer when the blade material is bonded. In the packaging containers in Examples 1 to 3 and Comparative Examples 1 and 2, a cutting blade in a surface state in which the shear strength between the wrap film and the cutting blade exposed surface is 0.03 N is used. Moreover, in the packaging container in Example 4 and Comparative Examples 3-4, the quantity of the polystyrene-type resin which is an additional component is reduced, and the cutting blade of the surface state from which the shear strength of a wrap film and a cutting blade exposed surface will be 0.21N Is used. In addition, the packaging container of Example 5 uses a cutting blade having a shear strength of 1.02 N to which a polystyrene resin, which is an additive component for roughening, is not added.

[Rewind evaluation]
Rewinding evaluation of the wrap film was performed using a varnish coating layer under the conditions of each example and each comparative example and a packaging container provided with a cutting blade having shear strength under the conditions of each example and each comparative example. As the wrap film, a product name NEW Kurewrap 30 cm × 20 m manufactured by Kureha Co., Ltd. was used. The wrap film was pulled out from the packaging container and cut from the center of the wrap film. After cutting, it was confirmed that when the lid was opened, the wrap film was peeled off from the varnish coating layer and rolled back inside the container body. The process from film cutting to lid opening was repeated 100 times, and the number of times of rewinding was confirmed. The results are shown in Table 2.

評価の結果、ラップフィルムと切断刃露出面のずり強度が１．０２Ｎと高い実施例５では、２６回巻き戻り、ずり強度が０．２１Ｎである実施例４では、３回巻き戻りが発生した。

As a result of evaluation, in Example 5 where the shear strength between the wrap film and the exposed surface of the cutting blade was as high as 1.02 N, the sample was rewound 26 times, and in Example 4 where the shear strength was 0.21 N, 3 times of rewind occurred. .

  On the other hand, Examples 1 to 3 and Comparative Examples 1 and 2 having a low shear strength of 0.03 N do not cause rewinding, and are comparative examples having the same shear strength as Example 4 in which the shear strength is 0.21 N. For 3-4, no rewinding occurred. This is because in Comparative Examples 3 to 4, the T peel strength immediately after attaching the wrap film of the varnish coating layer was higher than that of Example 4, so that the wrap film was in close contact with the varnish coating layer and rewinding could be prevented. Conceivable.

[sensory evaluation]
(Evaluation of ease of pinching)
For each example and each comparative example, sensory evaluation was performed on the ease of pinching when the wrap film was pinched using the same packaging container used in the above-described rewind evaluation. A series of operations of “pinch the wrap film, pull out the wrap film, cut the wrap film” was continuously performed, and the ease of pinching was evaluated. Further, after the wrap film was cut, it was stored for 3 days until “pinch the wrap film” in the next series of operations, and then evaluated by performing the above series of operations as an evaluation after 3 days. The evaluation judgment was given 3 points for "Picking the film with almost no resistance", 2 points for "I feel a little resistance when pinched", and 1 point for "I feel clearly resistance when pinched". The number of subjects was five, and the average value of the scores of the five subjects was obtained. The results are shown in Table 3. In Examples 1 to 5 in which the increase rate of the T-type peel strength after 3 days from the application immediately after the application of the varnish coating layer and the wrap film is 50% or less, 3 days after the application, even immediately after the application. Even wrap film was easy to pinch. On the other hand, in Comparative Examples 1 to 4 in which the increase rate of the T-type peel strength was 50% or more, the evaluation judgment was less than 2 points particularly in the ease of pinching after 3 days, and it was judged that there was a problem.

（フィルム縦裂けの発生の評価）
つまみ易さ評価と同様の包装容器を用いて、ラップフィルムをつまんだときのラップフィルムの縦裂けまたはフィルムのつまんだ部分が小片となってちぎれてしまう現象の発生有無を評価した。評価は各実施例および比較例ともに６０本で行い、ラップフィルムを引き出してカットし、ニス塗布層に貼り付いたラップフィルムをカット直後または３日間保管後にラップフィルムの中央部をつまみ、斜め下４５度の角度で引き出した。引き出した際にラップフィルムの裂けおよびちぎれなどが発生した回数を計測した。結果を表４に示す。実施例１〜５は、ニス塗布層がラップフィルムとの貼り付け直後に対する貼り付けから３日後におけるＴ型剥離強度の増加率が５０％以下であるため、貼り付け直後はもちろん、３日間保管後にラップフィルムを引き出しても、裂けおよびちぎれが発生しなかった。

(Evaluation of occurrence of vertical film tear)
Using the same packaging container as in the evaluation of the ease of pinching, the occurrence of a phenomenon in which the wrap film was vertically broken when the wrap film was pinched or a phenomenon that the pinched portion of the film was broken into small pieces was evaluated. The evaluation is carried out with 60 pieces in each example and comparative example, the wrap film is pulled out and cut, and the wrap film attached to the varnish coating layer is picked at the center of the wrap film immediately after cutting or after storage for 3 days. Pulled out at an angle of degrees. The number of times the wrap film was torn and torn when pulled out was counted. The results are shown in Table 4. In Examples 1 to 5, since the increase rate of the T-type peel strength after 3 days from the pasting of the varnish coating layer immediately after pasting with the wrap film is 50% or less, not only immediately after pasting but also after storage for 3 days Even when the wrap film was pulled out, no tearing or tearing occurred.

  The present invention can be suitably used as a packaging container.

DESCRIPTION OF SYMBOLS 1 Wrap roll 2 Wrap film 11 Container main body 12 Bottom plate 13 Front plate 14 Rear plate 15a, 15b Side plate 16 Opening part 21 Cover body 22 Lid top plate 23 Lid front plate 24a, 24b Lid side plate 31 Varnish application layer 31a Central varnish Coating layer 31b End varnish coating layer 31c Flap varnish coating layer 41 Cutting blade 51 Flap 52 Cut line 100 Packaging container

Claims (3)

In a packaging container containing a wrap film wound body, a container body having an open upper surface, and a lid body connected to a rear plate of the container body,
The lid includes a cutting blade that cuts the wrap film drawn from the wrap film roll,
A varnish coating layer is provided on the front plate of the container body,
The varnish coating layer satisfies the following condition 1 and condition 2,
A packaging container , wherein a surface of the cutting blade that contacts the drawn wrap film at the time of cutting satisfies the following condition 3 .
(Condition 1)
JIS Z-0237: 2009 T-type peel strength measured immediately after application of the wrap film in the T-type peel strength measured using a 25 mm wide varnish coating layer sample piece and a wrap film according to "Testing method for adhesive tape / adhesive sheet" T _i and the T-type peel strength T _3d 3 days after the attachment satisfy {(T _3d −T _i ) / T _i } × 100 ≦ 36 .
(Condition 2)
The T-type peel strength T _i is 2.5 × 10 ⁻² N / 25 mm or less.
(Condition 3)
The shear strength immediately after bonding of the 25 mm wide cutting blade sample piece and the wrap film measured in accordance with JIS Z-0237: 2009 “Adhesive tape / adhesive sheet test method” is 0.1 N / 25 mm or less. The packaging container according to claim 1, wherein the front plate includes a flap including a cut line formed on the front plate, and the varnish coating layer is provided at least on the front surface of the flap. . The packaging container according to claim 1 or 2, wherein the wrap film is a polyvinylidene chloride film.

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