JP5749456B2 - Film for display - Google Patents

Description

  The present invention relates to a display film, and more particularly to a display film including a transparent film layer, an image layer printed on the transparent film layer, and an adhesive layer in this order.

  Display films are used in various fields such as company name display, guidance display, traffic signs, and advertisements. Among these applications, the internal illumination display body with the display body film attached to the surface of the illumination unit is used by lighting the illumination unit (internal illumination), or does not turn on the illumination and external light including natural light is used. There are cases where the lighting is turned on (external lighting). In the case of internal illumination, light is emitted from the back surface (illumination unit side) of the display film attached to the surface of the illumination unit, so that the observer can display by observing the light transmitted through the display film. The image provided on the body film can be recognized. For this reason, in the case of internal illumination, there may be a difference between external illumination and color density, and a film with a smaller difference in color density is desired.

  Patent Document 1 describes a graphics structure including a receptor layer, a printed layer formed by printing the receptor layer, and an acrylic white pressure-sensitive adhesive layer in this order. This structure reduces the difference in color density between graphics when using internal illumination and when using external illumination, and provides a clear image for both internal and external illumination.

  Patent Document 2 discloses that a printing substrate (A) made of an acrylic resin film laminated on a releasable carrier and a printing surface formed by printing on the acrylic resin film are laminated on one side. An adhesive base material (B) having an adhesive layer in which a white pigment is dispersed, as an essential constituent material, for laminating the surface on an adherend, and the adhesive layer has form-retaining properties and both sides thereof A recording material for printing characterized in that a release film is laminated on one side is described. This recording material is said to be used as a material that has good durability such as scratch resistance and weather resistance and can be easily disposed of by incineration without being subjected to treatment such as overlaminate or topcoat.

JP 2009-282471 A JP 2002-366040 A

  The display film is required to have a clearer image. In particular, the display film used for the internal illumination display body is as clear as the case of external illumination even for internal illumination. There is a need to provide images. In addition, since the display body is often used outdoors, a film for a display body having both durability of an image and adhesion to the display body is required.

  In addition, conventionally, a white adhesive layer in which a white pigment is added to the adhesive layer in order to make the image layer clear is used, but if the white pigment is added too much, the adhesive strength of the adhesive layer is reduced, There is also a problem that the adhesion to other layers and the display body is reduced.

  Therefore, the present invention is a film for a display body including an image layer printed on a transparent film layer, and the thickness of the image layer is 10 micrometers or more and 100 micrometers or less, and displays a clear image, An object of the present invention is to provide a film for a display body which is excellent in adhesive strength between layers and adhesion to a display body and excellent in image durability.

  Another object of the present invention is to provide a film for a display body that displays a clear image similar to that of external lighting even for internal lighting.

  In order to achieve the above object, the present invention provides a display film comprising a transparent film layer, an image layer printed on the transparent film layer, and an adhesive layer in this order, and an end of the transparent film layer. Part and the edge part of the said adhesive layer are 2 mm or more outside over the perimeter of the edge part of the said image layer, and the film for display bodies whose thickness of the said image layer is 10 micrometers or more and 100 micrometers or less I will provide a.

  According to the film for display of the present invention, since the thickness of the image layer is 10 micrometers or more and 100 micrometers or less, a clear image can be provided, and the end portions of the transparent film layer and the adhesive layer are provided. Since it is on the outside of the entire circumference of the edge of the image layer, it has excellent adhesion to the display body, can prevent the transparent film layer from floating from the display body, and also increases the durability of the image layer. Can do.

It is the figure which showed typically the cross section of the film for display bodies which concerns on one aspect of this invention. It is the figure which showed typically the film for display bodies which concerns on one aspect of this invention seen from the observer side.

  FIG. 1 schematically shows a cross-sectional view of the display-use film 100 according to one embodiment of the present invention, which includes a transparent film layer 110, an image layer 120 printed on the transparent film layer, and an adhesive layer 130. It is included in this order.

  The transparent film layer 110 of the present invention is a layer made of a known resin composition conventionally used as a printable resin. Such a resin composition can be appropriately selected according to the printing method to be applied and the ink to be used. For example, acrylic resin, acrylic urethane resin, urethane resin, polyester resin, vinyl acetate resin, polyvinyl chloride resin, polystyrene resin, or olefin resin can be used. The transparent film layer can also be formed by applying and drying these resins to a base material, a release material or the like with a desired thickness.

  The transparent film layer 110 is transparent to such an extent that the image layer 120 on the back surface can be recognized when viewed from an observer. The light transmittance of this transparent film layer is, for example, Nippon Denshoku Kogyo Co., Ltd. according to “Measurement Method A of Light Transmittance and Total Light Reflectance A” in Section 5.5 of JIS K 7105 Plastic Optical Properties Test Method. The light transmittance when measured by SZ-Σ90 manufactured may be 60% or more.

  The thickness of the transparent film layer 110 varies depending on the desired durability and sharpness of the image layer, but may be, for example, about 20 micrometers to about 300 micrometers.

  The image layer 120 is provided on the transparent film layer 110 by, for example, various ink jet printing, electrostatic printing, silk screen printing, or the like using organic solvent ink, UV ink, silk screen ink, or the like. Preferably, inkjet printing using UV ink (UV inkjet printing) is used. This is because a thick image layer can be formed quickly, and a multilayer image layer can also be formed quickly. The thickness of the image layer is 10 micrometers or more and 100 micrometers or less. This is because if the image layer is thin, the image is not clear, and if the image layer is thick, bubbles are likely to remain between the transparent film layer 110 and the adhesive layer 130, which impairs the appearance of the display.

The image layer 120 may include a first design layer 121 printed on the transparent film layer, a white layer 122 printed on the first design layer, and a second design layer 123 printed on the white layer. Good. The first or second design layer may be monochromatic, but may include characters, figures, symbols, and the like. By making the image layer into a three-layer structure, it is possible to provide an image close to the sharpness at the time of external illumination by the diffusion effect of the white layer even at the time of internal illumination.
The first design layer 121 and the second design layer 123 may have the same design (color, character, figure, symbol, etc.). By using the same design, it is possible to further reduce the difference in sharpness in the external illumination.

  When used for an internal illumination display, the image layer 120 may be translucent. This is because a part of light from the illumination unit is transmitted to make the image layer clear.

  As the adhesive layer 130 of the present invention, a known adhesive resin or pressure-sensitive adhesive resin can be used. For example, acrylic resin, silicone resin, synthetic rubber resin, or natural rubber resin can be used, but acrylic resin is preferable from the viewpoint of weather resistance.

  The resin used for the adhesive layer 130 may contain a crosslinking agent, a colorant, an ultraviolet absorber, a heat stabilizer and the like, but it is preferable to use a transparent resin containing no colorant. This is because the inclusion of a large amount of colorant reduces the adhesive strength, and may reduce the adhesion between layers and the adhesive strength to the display body. The transparent adhesive layer made from the transparent resin has a transmittance higher than 50%, preferably 70% or higher when measured by the light transmittance measuring method described above.

  The end portion 111 of the transparent film layer and the end portion 131 of the adhesive layer are outside the entire circumference of the end portion 124 of the image layer. Thereby, the display body film 100 of the present invention prevents the transparent film layer 110 from floating from the image layer 120 or the adhesive layer 130, and prevents water or the like from entering between the image layer and the transparent film layer. Therefore, the durability of the image layer is improved.

  FIG. 2 is a schematic view of one embodiment of the display member film 200 of the present invention as viewed from the observer side. The end portion 211 of the transparent film layer and the end portion 231 of the adhesive layer are substantially in the same position when viewed from the viewer side, but as long as the end portion 224 of the image layer is on the outer side, the ends of both layers The positions of the portions 211 and 231 may be different from each other.

  The end portion 211 of the transparent film layer and the end portion 231 of the adhesive layer may be outside 2 mm or more over substantially the entire circumference of the end portion 224 of the image layer. Being on the outer side can further prevent the transparent film layer from floating from the image layer.

  The film for a display body of the present invention can be used as an internal display film by adhering it to a sheet made of a transparent or milky white resin and applying illumination from the sheet side.

  The film for display body of this invention can be manufactured by selecting a conventionally well-known method suitably. An example of the manufacturing method of the film for display bodies is shown below.

  First, a transparent resin is applied and dried on the release surface of the release film to form a transparent film layer. Subsequently, the obtained transparent film layer is printed by UV inkjet printing to form an image layer. The image layer is printed so as to be inside the outer edge of the transparent film layer over almost the entire circumference. For the image layer, first, the first design layer may be printed on the transparent film layer, then the white layer may be printed on the first design layer, and the second design layer may be further printed on the white layer. .

  Next, a solution obtained by dissolving an acrylic pressure-sensitive adhesive resin in an organic solvent is applied and dried on a release surface of another release film with a knife coater or a bar coater to obtain an adhesive layer. The obtained adhesive layer was cut so that the horizontal and vertical sizes were the same as the transparent film layer, and the release film obtained by laminating the transparent film layer and the image layer was laminated by dry lamination or the like. A film for a display body is produced.

  Examples of the present invention are shown below, but the present invention is not limited thereto.

Example 1
A vinyl chloride resin organosol was applied and dried on the surface of a peeled PET film (product name: G-2PET, manufactured by Teijin Ltd.) so that the thickness after drying was 45 micrometers, and a transparent film layer ( 1250 mm in length and 1000 mm in width). Using the UV inkjet printer (Electronics For Imaging, Inc., product name QS2000 UV printer) on the transparent film layer, a first design layer, a white layer printed on the first design layer, and the white layer An image layer consisting of the second design layer printed on was printed.

  For the first design layer, the ink ejection amount was set to about 66% for cyan ink, magenta ink, and yellow ink and 100% for black ink, corresponding to a total of 300%. For the white layer, white ink was set to a shot amount equivalent to 100%. For the second design layer, the same amount of ink was set as in the first design layer.

  The first and second design layers were the same color (black), and the total thickness of the image layer was 60 micrometers. Printing was performed so that the edge of the image layer was placed 10 mm inside the edge of the transparent film layer.

  Next, a resin obtained by adding a bisamide-based crosslinking agent to an acrylic resin-based pressure-sensitive adhesive of BA (butyl acrylate): AA (acrylic acid) = 90: 10 is applied to a release-treated PET film with a thickness of 30 μm after drying. It was applied and dried so as to be a meter, and an adhesive layer was obtained. The adhesive layer was transparent, and the total light transmittance was 87% when the total light transmittance was measured with SZ-Σ90 manufactured by Nippon Denshoku Industries Co., Ltd. The adhesive layer with the peeled PET film was cut into a length of 1250 mm and a width of 1000 mm, and laminated on the transparent film layer and the image layer to produce a film for display of this example.

Example 2
A display-use film of this example was produced in the same manner as in Example 1 except that printing was performed so that the edge of the image layer was disposed 5 mm inside the edge of the transparent film layer.

Example 3
A display-use film of this example was produced in the same manner as in Example 1 except that printing was performed so that the end of the image layer was placed 2 mm inside the end of the transparent film layer.

Example 4
A display body film of this example was produced in the same manner as in Example 1 except that an image layer consisting of only the first design layer was printed. The thickness of the image layer (first design layer) of this display film was 18 micrometers.

Comparative Example 1
A display-use film was produced in the same manner as in Example 1 except that the end of the image layer and the end of the adhesive layer were disposed at the same position as the end of the transparent film layer.

Comparative Example 2
A display-use film was produced in the same manner as in Example 1 except that an image layer (thickness was 5 micrometers) consisting of only the first design layer was printed.

Comparative Example 3
A display-use film was produced in the same manner as in Example 1 except that printing was performed so that the edge of the image layer was placed 1.5 mm inside the edge of the transparent film layer.

Comparative Example 4
A film for a display body was produced in the same manner as in Comparative Example 2, except that a white pigment (titanium oxide) was added to the acrylic resin-based adhesive (65 parts by mass with respect to 100 parts by mass of the adhesive in terms of solid content).

Inner / external lighting test The films for display bodies of Examples and Comparative Examples were each attached to a transparent polyvinyl chloride flexible sheet (manufactured by 3M, product name Panaflex 945) as test samples. Place the sample on a light box (product name: EYE Light Box, manufactured by Eye Graphics Co., Ltd.) with a fluorescent lamp inside, and the image layer is as clear as when external lighting (natural light) is on with the fluorescent lamp on. When it can be confirmed, it is set as Good, and the brightness is slightly increased and looks slightly gray, but when it can be used as a film for a display body, it is set as “Fair”. It was judged. The results are shown in Table 1.

A test sample was prepared by sticking the films for display bodies of the adhesion test examples and comparative examples to transparent vinyl chloride flexible sheets (product name: Panaflex 945, manufactured by 3M). The sample was placed in a constant temperature test machine in which the room temperature was adjusted to 65 ° C., taken out after 3 minutes, and the sample whose end was not lifted visually was set to Good, and the sample that floated was set to Poor. The results are shown in Table 1.

100, 200 Display film 110 Transparent film layer 111, 211 End of transparent film layer 120, 220 Image layer 121 First design layer 122 White layer 123 Second design layer 124, 224 End of image layer 130 Adhesion Adhesive layer 131, 231 Edge of adhesive layer

Claims (4)

A film for a display body including a transparent film layer, an image layer printed on the transparent film layer, and an adhesive layer in this order,
The edge of the transparent film layer and the edge of the adhesive layer are outside 2 mm or more over substantially the entire circumference of the edge of the image layer,
The film for display bodies whose thickness of the said image layer is 10 micrometers or more and 100 micrometers or less.   The image layer includes a first design layer printed on the transparent film layer, a white layer printed on the first design layer, and a second design layer printed on the white layer. The film for display bodies of description.   The display-use film according to claim 1, wherein the image layer is formed by a UV inkjet printer.   The internal illumination display body containing the sheet | seat, the film for display bodies of any one of Claims 1-3 affixed on the said sheet | seat via the said adhesive bond layer, and an illumination unit.