JP2009291979A - External packaging film and external packaging film for battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external packaging film and an external packaging film for a battery which prevent print of management data from being erased by friction in a conveying step or during using of a packaging object product packaged with the external packaging film, and beauty of the packaging object product is not spoiled even if the management data such as a recommended use limit is printed on the external packaging film. <P>SOLUTION: In the external packaging film (1, 1b) for packaging the object product, a wear resistant protective layer 10 is formed on the outer surface side of a film substrate 2, and a thin film area 11 having thin thickness layer is formed on the protective layer to print the management data 20 such as the recommended use limit of the object product. In the external packaging film for the battery, the protective layer is formed on the outer surface of a printing layer 5 where a decorative image for improving outer appearance or letters 30 for displaying the battery specification is printed on the outer surface of the film substrate, and the thin film area for printing the management data relating to the battery is formed on the protective layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exterior film for covering an article to be covered and a battery exterior film, in which an abrasion-resistant protective layer is formed on the outer surface side of the film substrate.

  As said exterior film, there exists an exterior film for covering the exterior can of a cylindrical battery, for example. This battery outer film covers an outer can that also serves as a positive electrode can or a negative electrode can, and is wound and pasted along the circumferential direction of a battery (unit cell) with a plain outer can exposed. Worn. Specifically, the exterior film has a heat-shrinkable resin film as a base material, and a metal vapor deposition layer and an adhesive layer are laminated on the back surface of the film base material. A printed layer on which an “exterior label” for displaying battery specifications is printed is formed. And the abrasion-resistant protective layer for protecting an exterior label is formed in the surface of the printing layer by coating.

  It should be noted that management data determined according to the shipping time of the battery, such as a recommended use deadline, a product number, and a manufacturing date, is stamped on such an exterior film by printing. The management data is normally printed on the surface of the protective layer immediately before the outer film is wound around the outer can, that is, immediately before shipment, so that no excessive outer film is generated. However, when management data is printed on the surface of the protective layer, for example, when the battery covered with the exterior film is transported while lying down on the belt conveyor, the batteries rub against each other, or the belt and the seal are printed. There is a problem that the ink on the stamped part disappears or becomes faint due to rubbing with the part.

Therefore, the following Patent Document 1 discloses an exterior film in which a non-protected portion not provided with a protective layer is formed on a part of the surface of a film substrate, and management data is printed on the non-protected portion. Yes. According to this exterior film, a step is generated between the protective layer and the non-protected portion, and the print portion of the management data can be protected from friction by the thickness of the protective layer.
Japanese Patent No. 281249

  The protective layer of the exterior film has the purpose of preventing the abrasion of the exterior label and the like under the protective layer, and also has the purpose of improving the aesthetics of the article to be covered with gloss. In the exterior film described in the said patent document, since there is no protective layer in the printing part of management data, there is no gloss in that part, and the beauty | look will be impaired.

  The present invention has been made to solve such a problem, and the purpose of the present invention is to provide a packaged article covered with the exterior film even when management data such as a recommended use period is printed on the exterior film. An object of the present invention is to provide an exterior film and a battery exterior film that do not lose the printing of management data due to friction during the transport process or in use, and that do not impair the appearance of the exterior product.

  In order to achieve the above object, the present invention provides an exterior film for covering an exterior article, in which an abrasion-resistant protective layer is formed on the outer surface side of the film base, In order to print management data such as a recommended use time limit of the outer-covered product, the outer-layer film is formed with a thin film region having a thin layer thickness.

  The present invention also extends to a battery outer film for covering an outer can of a cylindrical battery unit, and the battery outer film is provided on the outer surface of a film substrate for improving the appearance. A printed layer is formed by printing characters for displaying decorative images or battery specifications, and a wear-resistant protective layer is formed on the outer surface of the printed layer. In order to print management data such as a recommended use period, the battery outer film is formed with a thin film region having a thin layer thickness.

  According to the exterior film of the present invention, loss of management data and fading due to friction are surely prevented, and a protective layer is also formed on the portion where the management data is printed, so that the appearance of the exterior product is not impaired. .

=== Structure of exterior film ===
As an example of the present invention, an exterior film for a battery is given. In FIG. 1, the top view when the exterior film for batteries in a present Example is seen from the surface side was shown. FIG. 2 is an enlarged view taken along the line aa in FIG. The battery outer film 1 covers a unit cell by being wound along the circumferential direction of an outer can with a cylindrical battery as an outer article.

  The battery outer film 1 of this example uses a heat-shrinkable resin film such as polyethylene terephthalate or polyvinyl chloride as a base material 2, and aluminum is deposited on the back surface of the film base material 2, that is, the surface in contact with the unit cell. Layer 3 and adhesive layer 4 are formed. On the other hand, a printed layer 5 on which an exterior label 30 is printed is formed on the surface of the film substrate 2, and the varnish layer 10 on the surface of the printed layer 5, that is, a protective layer for the purpose of improving wear resistance and aesthetics. 10 is formed into a coating film.

  Then, a thin region (thin film region) 11 is formed in a part of the protective layer 10 having a predetermined thickness, and the protective layer 10 includes the thin film region 11 and a thick region (thickness). Film region) 12 is mixed. The thin film region 11 is printed with management data 20 that is determined according to the battery shipping time, such as the recommended battery use deadline, product number, and manufacturing date. In this embodiment, the thin film region 11 is formed in a band shape so as to cross a rectangular film substrate so as to follow the circumference of the battery when the cylindrical unit cell is covered with the exterior film 1. Yes. Of course, it is good also as a structure where the thick film area | region 12 surrounds the circumference | surroundings of the thin film area | region 11 like the exterior film 1b shown in FIG.

=== Method for Forming Protective Layer ===
In the exterior film (1, 1b) described above, the thickness of the protective layer 10 is partially different, and such a protective layer structure can be formed by application of a general film forming technique. it can. An example of the procedure for forming the protective layer 10 is shown in FIGS. Here, the procedure from the state (A) in which the film base 2 on which the printing layer 5 is formed is prepared is shown. In this figure, only the surface side of the film substrate 2 is shown enlarged.

  First, a varnish is coated on the surface of the printing layer 5 formed on the upper layer of the film substrate 2 by the film thickness t of the thin film region 11 to form a first varnish layer 10a (B). Next, the second varnish layer 10 b is formed with the remaining thickness d (T−t) so as to be the thickness T of the thick film region 12. At this time, a mask 40 is formed on the first varnish layer 10 a in a region to be the thin film region 11 by using a well-known photolithography technique, and the second varnish layer is formed in the region to be the thin film region 11. 10b is not formed (C). And after coating the 2nd varnish layer 10b in this way, if the mask 40 is peeled, the protective layer 10 which has the thin film area | region 11 will be formed (D).

  Of course, it is also possible to form the protective layers 10 partially having different thicknesses by a single coating process. For example, a varnish having a thickness T of the thick film region 12 is coated on the surface of the printing layer 5, and a plate in which a partial region of the surface is convex at a predetermined height is pressed against the coating surface. As a result, a region pressed against the convex region is formed in a concave shape as the thin film region 11. Alternatively, the plate is used as a transfer sheet, and varnish is applied to the entire transfer sheet. Then, if the varnish is transferred to the outer surface of the film substrate 2 (the surface of the printing layer 5) with the transfer sheet, the amount of the varnish in the convex portion of the transfer sheet is small, and this portion becomes the thin film region 11. In any case, the protective layer 10 in which regions (11, 12) having different thicknesses are mixed can be formed by applying a general coating technique or printing technique.

=== Abrasion resistance test ===
Next, the management data 20 was actually printed on the exterior film 1, and an abrasion resistance test was performed on the print portion 20 of the management data. In the test, a plurality of samples are prepared using a sample obtained by winding and pasting each exterior film on which management data is printed on an exterior can of a cylindrical battery. For each sample, friction was applied to the print portion 20 of the management data, and the management data was visually inspected for faintness and appearance.

  Specifically, the protective layer 10 is formed of an ultraviolet curable wear-resistant varnish, and the thickness of the protective layer 10 in the thick film region 12 is uniformly set to 4 μm, and the thickness of the protective layer 10 in the thin film region 11 is changed. Various exterior films 1 were prepared. Then, management data 20 is printed on the thin film region 11 of each exterior film using an industrial inkjet printer (Codebox 3 manufactured by Domino), and each exterior film 1 on which the management data 20 is printed is heated while being AA. The sample was wound around the battery outer can, the outer film 1 was contracted in the cylindrical circumferential direction of the battery, and the outer film was adhered to the outer can while the outer can was wrapped and bound to obtain each sample.

  Next, as shown in FIG. 5, the two cylindrical batteries 100 covered with the exterior film 1 having the same thickness of the thin film region 11 are arranged in parallel to bring both cylindrical side surfaces into contact with each other. The wear resistance test was performed by rotating 100 around the cylindrical shaft 101 in 30 opposite directions (102, 103).

Table 1 shows the test results.

  In Table 1 above, for each sample, the thickness (t) of the thin film region 11, the thickness and the thickness T of the thick film region 12 with respect to the thickness T (= 4 μm) of the thick film region 12 in the protective layer 10. Difference (depth d = T−t) and the inspection result are shown. The inspection result is when the wear state (disappearance, fading, etc.) of the management data 20 after the wear resistance test and the aesthetic appearance (gloss difference from the thick film region 11) of the area where the management data 20 is printed are visually inspected. This is the evaluation result. If it passes, “O” is indicated, and if it fails, “X” is indicated. “−” Indicates that the product is not subject to inspection.

  In each sample, the conventional example is a battery that is covered with an exterior film of t = 4 μm (d = 0 μm), that is, an exterior film that does not have the thin film region 11 and the entire surface becomes the thick film region 12. A comparative example is a battery covered with the exterior film described in Patent Document 1, that is, the exterior film having a thickness t of the thin film region 11 of 0 μm (d = T = 4 μm). And the invention products 1-3 are the batteries covered with the exterior film 1 which concerns on the Example of this invention.

  From the inspection results in Table 1 above, the management data 20 is faintly printed in the conventional example. Therefore, it was excluded from the aesthetic inspection. Further, in the comparative example, the management data did not disappear or faded, and the wear was passed “O”. However, since there is no protective film in the area where the management data 20 is printed, only that area has no gloss. The aesthetic appearance was rejected as “x”. On the other hand, in the inventive products 1 to 3, the management data 20 was not erased or faded regardless of the thickness t of the protective layer 10 in the thin film region 11. Further, the thin film region 11 had the same gloss as the other thick film regions 12, the aesthetic appearance was not impaired, and both the inspection results of wear and aesthetic were “good”.

  Therefore, in the battery outer film of the present invention, the management data such as the recommended usage date is not lost or it is not easy to see and it is difficult for the user to mix old and new batteries. Use can be reliably prevented. Further, since the protective layer 10 is also formed in the print area of the management data 20, it is uniformly glossy and the aesthetic appearance is not impaired. Therefore, for example, it looks good when it is displayed at a store as a product, and when the user compares the battery of the conventional example or the comparative example with the invention product, the battery according to the invention product has the same performance and the same price. Is more likely to buy.

  Note that the exterior article targeted by the present invention is not limited to a battery, and can be applied as long as it can print management data such as an expiration date determined according to shipping time, manufacturing time, and the like. Moreover, the exterior film of the format which forms a protective layer directly, without forming a printing layer on the surface of a film base material is also the scope of the present invention.

It is a top view of the exterior film which concerns on the Example of this invention. It is sectional drawing of the said exterior film. It is a top view of the exterior film which concerns on the other Example of this invention. It is a formation procedure figure of the protective layer in the said exterior film. It is explanatory drawing which shows the abrasion-resistance test method of the said exterior film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1b Exterior film 2 Film base material 5 Print layer 10 Protective layer 11 Thin film area | region 12 Thick film area | region 20 Management data 100 Cylindrical battery

Claims (2)

  A wear-resistant protective layer is formed on the outer surface side of the film base material, and is an exterior film for covering an article to be covered, such as a recommended use period for the article to be covered, etc. An exterior film characterized in that a thin film region having a thin layer is formed for printing management data.   A battery outer film for covering an outer can of a cylindrical battery, wherein a decorative image for improving the appearance and characters for displaying battery specifications are printed on the outer surface of the film substrate A layer is formed, and a wear-resistant protective layer is formed on the outer surface of the printed layer, and the protective layer has a layer thickness for printing management data such as a recommended use period of the cylindrical battery. A thin film region having a thin film is formed.