Laminate film and package

Abstract

To provide a laminate film and a package in which desired antibacterial properties can be realized even if antibacterial properties are not imparted onto the whole surface.SOLUTION: A laminate film according to an embodiment comprises a substrate layer, where the substrate layer has a resin film, antibacterial varnish is partially coated on the surface of the resin film, and, on the surface, a ratio of a varnish coating area per unit area is 10% or more and 90% or less. In this constitution, desired antibacterial properties can be realized even if antibacterial properties are not imparted to the whole surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a laminated film and a package.

Background Art

[0002] Patent Document 1 discloses an antibacterial humidity-regulating laminated sheet having a humidity-regulating function and antibacterial properties. The surface layer of the antibacterial humidity-regulating laminated sheet is formed of a resin to which silver ions or copper ions are added. Since the surface layer contains silver ions or copper ions, it has antibacterial properties.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology of Patent Document 1 above, since the surface layer is composed of a resin containing silver ions or copper ions, antibacterial properties are imparted to the entire surface of the sheet. However, when considering the influence on the reading accuracy of POS codes, QR codes (registered trademarks), etc., and the peel strength behavior of re-sealing tack labels, etc., it may not be possible to impart antibacterial performance to the entire surface of the sheet. On the other hand, in recent years, due to the increasing awareness of hygiene, antibacterial properties are expected to be imparted even to packages to which POS codes, QR codes (registered trademarks), etc. are applied.

[0005] An object of the present invention is to provide a laminated film and a package capable of achieving desired antibacterial properties even if antibacterial properties are not imparted to the entire surface.

Means for Solving the Problems

[0006] The laminated film according to one aspect of the present invention includes a base material layer, the base material layer has a resin film, an antibacterial varnish is partially applied to the surface of the resin film, and on the surface, the ratio of the varnish application area per unit area is 10% or more and 90% or less. In this case, by the ratio of the varnish application area per unit area on the surface of the resin film being within the above range, even if the entire surface of the resin film is not coated with the antibacterial varnish, the desired antibacterial property can be ensured.

[0007] On the surface of the resin film, a plurality of coated portions coated with the antibacterial varnish are formed, and the plurality of coated portions may be arranged in a lattice pattern. In this case, it is easy to impart a decorative property to the resin film.

[0008] The package according to another aspect of the present invention is a package constituted by the laminated film. Since this package is constituted by the laminated film, even if the entire surface of the resin film is not coated with the antibacterial varnish, antibacterial property at least comparable to the case where the entire surface of the resin film is coated with the antibacterial varnish can be ensured.

Advantages of the Invention

[0009] According to the present disclosure, it is possible to provide a laminated film and a package capable of realizing the desired antibacterial property even if antibacterial property is not imparted to the entire surface.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

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BEST MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same elements are denoted by the same reference numerals, and redundant descriptions are omitted. The dimensional ratios in the drawings do not necessarily match those in the description.

[0012] FIG. 1 is a schematic diagram showing the layer structure of the laminated film 1 according to one aspect of the present invention. The laminated film 1 has a base material layer 10. In the present embodiment, the laminated film 1 is a sheet constituting a package. Examples of the package constituted by the laminated film 1 are used for pouches, lid materials, outer bags (or boxes) for accommodating wet tissues, etc.

[0013] The base material layer 10 has a first resin film 11. The first resin film 11 is a film located on the outer surface side of the package when the package is formed by the laminated film 1. Examples of the first resin film 11 may be a single film such as a polyester film, a nylon film, a polypropylene film, or a laminated film of two or more of them. The first resin film 11 may be a uniaxially stretched film or a biaxially stretched film. The thickness of the first resin film 11 is set according to the use of the laminated film 1. An example of the thickness of the first resin film 11 is 5 μm or more and 100 μm or less.

[0014] The base material layer 10 may include at least one of a first resin film 11, a printing layer 12, a barrier layer 13, and a second resin film 14. When the base material layer 10 further includes the printing layer 12, the barrier layer 13, and the second resin film 14, for example, as illustrated in FIG. 1, the printing layer 12, the barrier layer 13, and the second resin film 14 may be laminated on the first resin film 11.

[0015] The printing layer 12 is a layer composed of ink for printing product descriptions, various patterns, etc. of the product accommodated in the package to which the laminated film 1 is applied.

[0016] The barrier layer 13 is, for example, a metal layer or a barrier coat layer. Examples of the material of the metal layer are aluminum, alumina, silica, etc. The metal layer may be a vapor deposition film of the exemplified metal or a metal foil formed from the exemplified metal. Examples of the barrier coat layer are a resin layer containing an inorganic filler, a layer composed of a PVA binder, etc. The barrier layer 13 may be a transparent vapor deposition film in which a metal vapor deposition film such as aluminum is formed on a PET film or the like.

[0017] An antibacterial varnish is partially applied to the surface 11a of the first resin film 11. As a result, a coated area 21 where the antibacterial varnish is applied and an uncoated area 22 where the antibacterial varnish is not applied are formed on the surface 11a.

[0018] The laminated film 1 having the above configuration may have a plurality of coated portions 21a formed by applying an antibacterial varnish on the surface 11a of the first resin film 11. In one embodiment, the coated area 21 is an area formed by the plurality of coated portions 21a.

[0019] As shown in FIG. 2, an example of the shape of the coating section 21a is a triangle with a base length of s (mm) and a height of t (mm). FIG. 2 is a drawing showing an example of the coating section. The shape of the coating section 21a may be a quadrilateral (for example, a rectangle or a square), a polygon with five or more sides, or a circular shape (including an ellipse). The plurality of coating sections 21a may be, for example, a plurality of concentric rings with different diameters. In this case, the centers of the plurality of concentric rings may coincide.

[0020] In the laminated film 1, the ratio of the coating area of the antibacterial varnish per unit area, that is, the ratio of the area of the coating region 21 to the total surface area of the surface 11a, is 10% or more and 90% or less, and may be 50% or more and 70% or less. Hereinafter, the ratio of the coating area of the antibacterial varnish per unit area is referred to as the "varnish coating area ratio". An example of the coating amount of the antibacterial varnish is 0.3 g / m 2 (0.3 × 10 -3 kg / m 2 ) or more. The coating amount of the antibacterial varnish is, for example, 1.5 g / m 2 (1.5 × 10 -3 kg / m 2 ) or less.

[0021] The antibacterial varnish is a varnish in which an antibacterial agent is contained in a binder. Examples of the binder include polyamide degreased cotton. Examples of the antibacterial agent include silver-based antibacterial agents. The coating region 21 is formed by printing the antibacterial varnish in a predetermined pattern. For example, the coating region 21 is formed by gravure printing the antibacterial varnish. In this case, the antibacterial varnish is also gravure ink. For the antibacterial varnish, for example, "Rab Coat S202 AB4" manufactured by Sakata Inx Co., Ltd. may be used.

[0022] Hereinafter, the coating pattern of the antibacterial varnish will be described with reference to FIGS. 3 to 7. In the description of FIGS. 3 to 7, the X direction and the Y direction shown in FIGS. 3 to 7 may be used. The X direction and the Y direction are orthogonal to each other.

[0023] Figure 3 is a drawing showing an example of the coating pattern of antibacterial nisin. The coating pattern shown in Figure 3 is referred to as "Pattern P1". Pattern P1 is a pattern formed by arranging the triangular coating portions 21a shown in Figure 2 in a lattice pattern. In Pattern P1, as shown in Figure 3, a plurality of rows of coating portions 211 extending in the X direction are arranged in parallel in the Y direction.

[0024] Each row of coating portions 211 is composed of a plurality of coating portions 21a arranged at a pitch s in the X direction. In the Y direction, the plurality of rows of coating portions 211 are arranged at a pitch t. In Figure 3, in two adjacent rows of coating portions 211 in the Y direction, one row of coating portions 211 is shifted by s / 2 with respect to the other row of coating portions 211.

[0025] In Pattern P1, non - coating portions having the same triangular shape as the coating portions 21a are arranged between two adjacent coating portions 21a in each of the X and Y directions. In Pattern P1, the coating portions 21a and the non - coating portions having the same triangular shape are arranged alternately. In Pattern P1, the varnish coating area ratio is 50%.

[0026] Figure 4 is a drawing showing another example of the coating pattern of antibacterial nisin. The dashed - dotted line in Figure 4 is a dashed - dotted line for distinguishing the rows of coating portions 221. The coating pattern shown in Figure 4 is referred to as "Pattern P2". Pattern P2 is another example of a pattern formed by arranging the triangular coating portions 21a shown in Figure 2 in a lattice pattern.

[0027] Pattern P2 is the same as Pattern P1 except that the pitch between two adjacent coating portions 21a in the row of coating portions 211 is changed to 2s. In this case, the interval between two adjacent coating portions 21a in each of the X and Y directions is widened. In Pattern P2, the varnish coating area ratio is 25%.

[0028] FIG. 5 is a drawing showing another example of the coating pattern of the antibacterial nisin. The dashed-dotted line in FIG. 5 is a dashed-dotted line for distinguishing the coating part column 221. The coating pattern shown in FIG. 5 is referred to as "pattern P3". Pattern P3 is still another example of a pattern formed by arranging the triangular coating parts 21a shown in FIG. 2 in a lattice pattern.

[0029] Pattern P3 is the same as pattern P2 except that the pitch between two adjacent coating part columns 211 in the Y direction is changed to 2t. In this case, the interval between two adjacent coating parts 21a in the direction of 45 degrees with respect to the X direction (or Y direction) is wider than that in the case of pattern P2. In pattern P3, the varnish coating area ratio is 12.5%.

[0030] FIG. 6 is a drawing showing another example of the coating pattern of the antibacterial nisin. The coating pattern shown in FIG. 6 is referred to as "pattern P4". Pattern P4 is a pattern in which the coated area 21 and the non-coated area 22 are inverted in pattern P3 shown in FIG. 5. Therefore, in pattern P4, the varnish coating area ratio is 87.5%. The coated area 21 may be an area formed by arranging the triangular coating parts 21a shown in FIG. 2 so as not to have a gap, as shown by the dashed line in FIG. 6, for example.

[0031] FIG. 7 is a drawing showing another example of the coating pattern of the antibacterial nisin. The coating pattern shown in FIG. 7 is referred to as "pattern P5". Pattern P5 is a pattern in which the coated area 21 and the non-coated area 22 are inverted in pattern P2 shown in FIG. 4. Therefore, in pattern P5, the varnish coating area ratio is 75%. The coated area 21 may be an area formed by arranging the triangular coating parts 21a shown in FIG. 2 so as not to have a gap, as shown by the dashed line in FIG. 6, for example.

[0032] In the laminated film 1 described above, the entire surface 11a of the first resin film 11 is not coated with the antibacterial varnish. Even in this case, a desired antibacterial property can be achieved by the ratio of the varnish-coated area per unit area (varnish-coated area ratio) being 10% or more and 90% or less. The desired antibacterial property is, for example, at least the same antibacterial property as when the entire surface 11a of the first resin film 11 is coated with the antibacterial varnish (hereinafter referred to as "full-surface coating").

[0033] Since the entire surface 11a is not coated with the antibacterial varnish, the appearance of the laminated film 1 and the package using the same can be given a decorative property (or design property). When the entire surface 11a is not coated with the antibacterial varnish, it is easy for users and the like to visually recognize that the antibacterial coating has been applied, so it is possible to improve the user's sense of security regarding the laminated film 1 and the package using the same.

[0034] Since it may affect the reading accuracy of POS codes, QR codes (registered trademarks), etc., and the peel strength behavior of the resealing tack label, etc., there may be cases where full-surface coating of the antibacterial varnish cannot be performed on the surface to which antibacterial properties should be imparted. Even in such cases, in the laminated film 1, while antibacterial properties can be ensured, since the antibacterial varnish is not fully coated, POS codes, QR codes (registered trademarks), etc. can be easily applied to the laminated film 1 or the package using the same, and the influence on the resealing tack label can also be reduced.

[0035] Since the antibacterial varnish is partially coated on the surface 11a of the first resin film 11, for example, it is easier to apply designs more freely to the laminated film and the package using the same.

[0036] Next, experimental examples will be described. The experimental examples will be described by specifically showing materials and the like, but the present invention is not limited to the following experimental examples. First, the basic configuration of the laminated film in the experimental examples will be described.

[0037] [Basic Configuration of Laminated Film] In the following Experimental Examples 1 to 11, a laminated film having the following layer configuration was used. Coating area of antibacterial sizing agent / PET film / printing layer / aluminum layer / CPP film

[0038] · The coating area of the antibacterial sizing agent was formed by partially coating the antibacterial sizing agent on the surface of the PET film. The antibacterial sizing agent used was "Rab Coat S202 AB4" manufactured by Sakata Inx Corporation. In Experimental Examples 1 to 11 described later, the coating state of the antibacterial sizing agent was changed. · The thickness of the PET film (resin film) was 12 μm. · The printing layer was a layer formed by ink: "Bell Color HS R White 165". · The thickness of the aluminum layer was 6 μm. · The thickness of the CPP film was 30 μm.

[0039] The shape of each coating part formed by the antibacterial sizing agent was triangular, similar to the case of FIG. 2. The length s in FIG. 2 was 9.2 mm, and the length t was 4.85 mm. In the plan view of the laminated film used in Experimental Examples 1 to 11, the lengths of the laminated film in the X direction and the Y direction shown in FIG. 2 were 40 mm.

[0040] (Experimental Example 1) In Experimental Example 1, the coating area of the antibacterial sizing agent was formed so that the sizing agent coating area ratio was 87.5%. Specifically, as the coating pattern of the antibacterial sizing agent, a pattern in which the coated area and the non-coated area in Pattern P3 shown in FIG. 5 were reversed (that is, Pattern P4 shown in FIG. 6) was adopted. The sizing agent coating amount was 0.80 g / m 2 (0.8×10 -3 kg / m 2 )

[0041] (Experimental Example 2) In Experimental Example 2, the coating area of the antibacterial sizing agent was formed so that the sizing agent coating area ratio was 75%. Specifically, as the coating pattern of the antibacterial sizing agent, a pattern in which the coated area and the non-coated area in Pattern P2 shown in FIG. 4 were reversed (that is, Pattern P5 shown in FIG. 7) was adopted. The sizing agent coating amount was 0.80 g / m 2It was.

[0042] (Experimental Example 3) In Experimental Example 3, a coating area of antibacterial varnish was formed so that the varnish coating area ratio was 50%. Specifically, as the coating pattern of the antibacterial varnish, the pattern P1 shown in FIG. 3 was adopted. The varnish coating amount was 0.80 g / m 2 It was.

[0043] (Experimental Example 4) In Experimental Example 4, a coating area of antibacterial varnish was formed so that the varnish coating area ratio was 25%. Specifically, as the coating pattern of the antibacterial varnish, the pattern P2 shown in FIG. 4 was adopted. The varnish coating amount was 0.80 g / m 2 It was.

[0044] (Experimental Example 5) In Experimental Example 5, a coating area of antibacterial varnish was formed so that the varnish coating area ratio was 12.5%. Specifically, as the coating pattern of the antibacterial varnish, the pattern P3 shown in FIG. 5 was adopted. The varnish coating amount was 0.80 g / m 2 It was.

[0045] (Experimental Example 6) In Experimental Example 6, a coating area of antibacterial varnish was formed so that the varnish coating area ratio was 12.5%. Specifically, as the coating pattern of the antibacterial varnish, the pattern P3 shown in FIG. 3 was adopted. The varnish coating amount was 0.30 g / m 2 It was.

[0046] (Experimental Example 7) In Experimental Example 7, a coating area of antibacterial varnish was formed so that the varnish coating area ratio was 75%. Specifically, as the coating pattern of the antibacterial varnish, the pattern obtained by inverting the coated area and the non-coated area in the pattern P2 shown in FIG. 4 (that is, the pattern P5 shown in FIG. 7) was adopted. The varnish coating amount was 1.50 g / m 2 It was.

[0047] (Experimental Example 8) In Experimental Example 8, a coating area of the antibacterial varnish was formed such that the varnish coating area ratio was 75%. Specifically, as the coating pattern of the antibacterial varnish, a pattern in which the coated area and the uncoated area in Pattern P2 shown in FIG. 4 were reversed (i.e., Pattern P5 shown in FIG. 7) was adopted. The varnish coating amount was 0.30 g / m 2 was used.

[0048] (Experimental Example 9) In Experimental Example 9, a coating area of the antibacterial varnish was formed such that the varnish coating area ratio was 75%. Specifically, as the coating pattern of the antibacterial varnish, a pattern in which the coated area and the uncoated area in Pattern P2 shown in FIG. 4 were reversed (i.e., Pattern P5 shown in FIG. 7) was adopted. The varnish coating amount was 0.10 g / m 2 was used.

[0049] (Experimental Example 10) A laminated film having the same configuration as that of Experimental Example 1 was prepared, except that a coating area of the antibacterial varnish was formed by coating the entire surface of the PET film with the antibacterial varnish. Since the laminated film of Experimental Example 10 was a full-surface coating, the varnish coating area ratio was 100%. The varnish coating amount was 0.80 g / m 2 was used.

[0050] (Experimental Example 11) In Experimental Example 11, a coating area of the antibacterial varnish was formed such that the varnish coating area ratio was 6.25%. Specifically, as the arrangement pattern of the coated portions, Pattern P6 shown in FIG. 8 was adopted. Pattern P6 is a pattern in which the interval between adjacent coated portions 21a in Pattern P5 was substantially changed to 4s. The varnish coating amount was 0.80 g / m 2 was used.

[0051] The following evaluation tests of antibacterial property, visibility, and cosmetic property were carried out on the laminated films prepared in Experimental Examples 1 to 11.

[0052] <Antibacterial property> In accordance with JIS Z 2801-2010: "Antimicrobial Processed Products - Antimicrobial Test Methods and Antimicrobial Effects" (especially, "5. Test Methods"), an antimicrobial test was conducted using the laminated films prepared in Experimental Examples 1 to 11 as samples. The strain in the test bacterial solution was Escherichia coli (NBRC3972). The above test bacterial solution was dropped, the samples (the laminated films of Experimental Examples 1 to 11 respectively) were covered, and the test bacterial solution was made to adhere closely to the samples, followed by culturing at 35 ± 1 °C and a relative humidity of 90% or more for 24 hours. Then, the bacterial solution was washed out, and the viable cell count per 16 cm of the sample was measured. 2 The antibacterial activity values obtained for the laminated films of Experimental Examples 1 to 11 were as shown in Table 1.

[0053] <Visibility> Under the illumination of indoor fluorescent lamps, the surfaces of the laminated films of Experimental Examples 1 to 11 were visually confirmed. This evaluation test was carried out by 20 monitors. When the number of people who could confirm the coated area was 16 or more, the evaluation was A+; when the number of people who could confirm the coated area was 12 or more and less than 16, the evaluation was A; when the number of people who could confirm the coated area was less than 12, the evaluation was B. The evaluation results were as shown in Table 1.

[0054] <Glossiness> Similar to the case of visibility, under the illumination of indoor fluorescent lamps, the surfaces of the laminated films of Experimental Examples 1 to 11 were visually confirmed. This evaluation test was carried out by 20 monitors. When the number of people who could confirm the glossiness was 16 or more, the evaluation was A+; when the number of people who could confirm the glossiness was 12 or more and less than 16, the evaluation was A; when the number of people who could confirm the glossiness was less than 12, the evaluation was B. The evaluation results were as shown in Table 1.

[0055]

Table 1

[0056] From the results shown in Table 1, when the varnish coating area ratio is reduced to 6.25% as in Experimental Example 11, antibacterial properties cannot be ensured. However, in Experimental Examples 1 to 9 where the varnish coating area ratio is 10% or more and 90% or less, it can be understood that at least the same antibacterial properties as in Experimental Example 10 with a varnish coating area ratio of 100% can be achieved.

[0057] Furthermore, when the varnish coating area ratio is 10% or more and 90% or less, and the coating amount is 0.3 g / m 2 or more, it can be understood that it is easy to ensure visibility. In particular, when the varnish coating area ratio is 50% or more and 75% or less, and the coating amount is 0.3 g / m 2 or more, it is easy to ensure visibility. Similarly, when the varnish coating area ratio is 10% or more and 90% or less, and the coating amount is 0.3 g / m 2 or more, it can be understood that it is easy to ensure a gloss feeling. In particular, when the varnish coating area ratio is 50% or more and 75% or less, and the coating amount is 0.3 g / m 2 or more, it is easy to ensure a gloss feeling.

[0058] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-exemplified embodiments, and includes the scope indicated by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included. Also, the exemplified embodiments and modified examples may be appropriately combined as long as they do not depart from the gist of the present invention.

Explanation of Reference Numerals

[0059] 1... laminated film, 10... base material layer, 11... first resin film (resin film), 21... coating region, 21a... coating portion, 22... non-coating region.

Claims

1. Comprising a base material layer, the base material layer has a resin film, an antibacterial varnish is partially applied to the surface of the resin film, on the surface, the ratio of the varnish coating area per unit area is 10% or more and 90% or less, a laminated film.

2. On the surface of the resin film, a plurality of coated portions coated with the antibacterial varnish are formed, the plurality of coated portions are arranged in a lattice pattern, The laminated film according to Claim 1.

3. A package constituted by the laminated film according to Claim 1 or 2.

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