JP6012297B2 - Hologram forming method by screen printing and method for producing hologram sheet and packaging package - Google Patents

Description

The present invention relates to a method of forming a hologram by screen printing that can form a hologram at low cost, and a method of manufacturing a hologram sheet and a packaging package using the method . Strictly speaking, the hologram referred to in the present invention is a pseudo-hologram that gives a hologram-like impression (three-dimensional effect or glittering feeling) and the pattern changes depending on the observation angle.

  Holograms generally use a transfer body such as a press mold, and the surface shape of the relief forming layer (such as lenticular lenses and dots) formed on the transfer body is covered with a resin sheet or a foil having a resin coating layer. It is formed by a method of transferring to a transfer body.

  In Patent Document 1 below, a molten resin layer is extrusion coated onto a base sheet, and a hologram forming stamper mounted on a roll is pressed against the molten resin layer to form a hologram on the surface of the base sheet. Is disclosed, and in this method, the stamper is a transfer body.

  In Patent Document 2 below, the surface of the relief forming layer of the transfer medium is heated by pressing the surface of the relief forming layer of the transfer medium while pressing the surface of the relief forming layer of the transfer medium against the thermoplastic resin layer on the surface of the transfer medium. A method of forming a hologram image for transferring the image is disclosed, and this method is also a hologram formation by transfer.

  There is also a method of giving a glittering feeling to a sheet or the like by printing. For example, in the method described in Patent Document 3 below, a holographic recording material is attached to a sheet in a dot shape with a printer, and the applied holographic recording material is irradiated with a plurality of laser beams to form interference fringes. Record. Therefore, this method can form a hologram without depending on transfer.

JP 2008-32829 A JP 2009-96115 A JP 2008-213319 A

  In the conventional methods described above, particularly, the method of forming a hologram by transferring the surface shape of the relief forming layer, the price of the transfer body provided with the relief forming layer is very high. For example, in the case of a press die, the price is 1 million yen or more, and in the case of an expensive one, it is 10 million yen. Therefore, it is inevitable that the unit price of the hologram sheet or the like becomes high.

  In addition, when transferring the surface shape of the relief forming layer, it is necessary to heat the substrate that is the transfer target to soften the thermoplastic resin on the substrate surface or to coat the surface of the substrate with a molten resin This also increases costs.

  In addition, although the method of patent document 3 becomes a pattern with a three-dimensional effect, the pattern does not change according to the angle of observation, and an effective hologram that attracts more eyes cannot be created. Further, since it is necessary to use a hologram ink containing a hologram-processed powder, this is not as high as the transfer method, but this also increases the cost.

  Accordingly, an object of the present invention is to make it possible to inexpensively form a hologram (pseudo hologram) that is beautiful and undergoes a pattern change.

In order to solve the above problems, in the present invention, a pseudo hologram is formed by screen printing.
Specifically, the base material is a vapor-deposited paper or glossy paper having a halftone underprint layer on its surface, or a transparent resin film having a base print layer with a mirror ink on its surface,
On the base printing layer of this base material, the first halftone dot printing (top printing by screen printing) is performed as top printing.
Next, the angle of the screen mask (plate making) used for the first halftone dot printing is changed in the range of 0.2 ° to 1 ° around one corner of the screen mask, and the second halftone dot printing (upper In the first halftone dot printing and the second halftone dot printing, a pattern of a pseudo-hologram (hereinafter simply referred to as a hologram) is formed by forming a top printing dot whose surface forms a convex curved surface. Cause it to occur.

  Holograms formed by this method have the most stereoscopic effect when the angle change value from the first halftone dot printing of the screen mask when the second halftone dot printing is performed is 0.5 °. become.

  Further, when a dot having a contact angle of 90 ° or more with respect to the base print layer is provided as the dot, a high-quality hologram is formed.

  When the second halftone dot printing is performed using an ink obtained by adding glitter powder such as glass powder to the ink used in the first halftone dot printing, a more beautiful hologram is formed. The ink used in the first halftone dot printing and the second halftone dot printing may be either colored ink or transparent ink. As the colored ink, it is preferable to use an ink that has light transmittance and can form halftone dots. By using a light-transmitting ink to which glass powder is added at the time of the second halftone dot printing, the effect of adding glass powder (enhancement of glitter, etc.) is drawn out.

  It is preferable to use a screen mask having a polyester mesh sputtered with stainless steel having a screen line number (dot number) of 100 to 175 and a mesh of 355 to 460 mesh. It is also preferable to perform the first halftone dot printing using UV ink (ultraviolet curable ink).

Production of a hologram sheet having a hologram formed on the surface of the substrate by the method of the present invention, or a packaging package made by assembling the hologram sheet so that the hologram appears on the outer surface after cutting the blank material. A method is also provided.

  In addition, the hologram formed on the surface of the substrate by the method of the present invention has a three-dimensional effect and a glittering feeling, and the pattern changes depending on the observation angle.

  The reason why such a hologram can be obtained is that moire occurs by changing the angle of the screen mask from the position of the first halftone printing and performing the second halftone printing, and the first and second halftone printing. Since the dots of the top printing formed by dot printing have a convex curved surface, a lens effect is also produced, and the synergistic effect of them creates a three-dimensional effect, a glittering feeling, and a pattern change depending on the observation angle.

  Moire in screen printing is generally considered undesirable in terms of visual effects, but the present invention has successfully used it to form an effective hologram.

  According to the method of the present invention, a hologram can be formed by screen printing. The mask used for screen printing is about 10,000 yen. The substrate may be any of vapor-deposited paper, glossy paper, and transparent resin film, and heating of the substrate required for transferring the surface shape of the relief forming layer by the conventional method, or the molten resin to the substrate. No coating or the like is required, which makes it possible to significantly reduce the price of the hologram sheet as compared with the conventional method using a press die.

  In addition, not only a three-dimensional effect and a glittering feeling can be obtained, but also a pattern change depending on the observation angle, so that the quality of the hologram is higher than that formed by the method of the above-mentioned Patent Document 3, and the hologram ink is not used. In terms of cost, it will be better.

Sectional view showing an example of base material Sectional drawing which shows the other example of a base material Sectional drawing which shows another example of a base material Plan view showing dots formed by screen mask and halftone printing Explanatory drawing of contact angle of dots formed by halftone printing Explanatory drawing of angle change of screen mask in first halftone dot printing and second halftone dot printing The top view which expands and shows the dot of the top printing formed by the 1st halftone dot printing and the 2nd halftone dot printing The perspective view which shows an example of the packaging package formed using the hologram sheet as a blank material

  Hereinafter, based on FIGS. 1 to 7 of the accompanying drawings, embodiments of a hologram forming method by screen printing of the present invention and a hologram sheet produced by the method will be described.

  1 of FIG. 1 is a base material. The base material 1 used here is based on the vapor-deposited paper 2 having a metal vapor-deposited layer 2a on the surface, but the base portion may be the glossy paper 3 shown in FIG. The transparent resin film 4 shown in FIG. 3 may be used.

  A substrate 1 is prepared by previously providing a halftone (semi-transmissive) base printing layer 5 on the surface of the vapor-deposited paper 2, glossy paper 3, or transparent resin film 4 as a base.

  When the transparent resin film 4 is used as a base, printing with mirror ink on the surface of the film becomes the halftone underprint layer 5.

  When the vapor-deposited paper 2 or glossy paper 3 is used as a base, a halftone underprint layer 5 is provided on the surface of the base to form the base material 1.

  The base printing layer 5 does not ask | require a printing system. The base printing layer 5 can be provided by screen printing, offset printing, inkjet printing, gravure printing, or the like.

  Next, as shown in FIG. 4, dot printing (preferably halftone dots) 7 is formed by halftone dot printing (screen printing) on the base printing layer of the base material using the screen mask 6. To do. As shown in FIG. 5, the dot 7 has a convex curved surface.

  By selecting the screen mask 6 as described below as the screen mask 6 used in the halftone dot printing on the upper surface, dots having a convex curved surface can be formed.

  As the screen mask 6 used at this time, a mask made of Tokai Shoji (SERIA group) in which stainless steel is sputtered on a polyester mesh is excellent in ink permeability and has a large contact angle α shown in FIG. I liked printing a dot with a high lens effect.

  The contact angle α of the dots 7 with respect to the base print layer is preferably 90 ° or more. The contact angle α of dots in normal screen printing is 90 ° or less, but by using the above-mentioned screen mask in combination with a highly viscous medium ink, dots with a contact angle α of 127 ° can also be formed. Such a dot was particularly effective in obtaining a three-dimensional effect.

  The screen mask 6 preferably has 100 to 175 screen lines. As the number of lines increases, a beautiful hologram is formed. Therefore, a 175 line screen mask is particularly suitable.

  A screen mask mesh of 355 to 460 lines / inch is suitable. In particular, the screen mask of 460 lines / inch mesh is compatible with any of the above-mentioned line numbers.

The ink used for halftone dot printing on the upper side may be either UV ink or thermosetting ink. From the standpoint of productivity, UV ink that is quickly dried and cured is advantageous. A high viscosity ink is preferred because it can increase the contact angle. As a recommended ink, for example, RECURE 4100 (trade name) Braille medium manufactured by Jujo Chemical is listed.

  The top printing is performed twice using the same screen mask. The second halftone dot printing is performed by slightly changing the angle of the screen mask from the first halftone dot printing. The angle θ of change of the mask shown in FIG. 6 is set to 0.2 ° to 1 °, which is an angle range in which moire is easily generated. In particular, when the angle θ is 0.5 °, a hologram having the best stereoscopic effect is formed.

And upper base printed dots _7-1 are formed by the first halftone printing, showing an example of a second upper base printed dots 7 _-2 arrangement state of which is formed by halftone printing in Fig. Since the angle change of the screen mask in the first halftone printing and the second halftone indicia is small, many dots 7 _-2 formed dots _7-1 is formed by first printing and the second time printing Are partially overlapped as shown in FIG.

  As a result, moire occurs, and since the dots formed by dot printing have a convex curved surface, a lens effect is also produced, and the moire and the lens effect combine to produce a three-dimensional effect and a glittering feeling, depending on the observation angle. A hologram is formed that also causes a pattern change.

  When using the recommended UV medium ink for the first halftone printing, for example, when using the ink obtained by mixing the glittering powder with the ink used for the first time in the second halftone printing. A strong hologram can be produced.

  The glittering powder used at this time may be glass powder. A glass powder having a particle diameter of 6 to 12 μm made of Southeast Ink or made of Japanese plate glass can be suitably used. When the glass powder is added to UV medium ink and stirred well and used for the second halftone dot printing, a hologram with frequent pattern change depending on the observation angle can be formed by refraction of light.

  The screen printing apparatus used for forming the hologram of the present invention is a screen printing apparatus manufactured by Tokai Shoji (SERIA Group), which can freely change the angle of the screen mask and also has an offset mechanism for changing the angle of the printed matter. We liked it and it was easy to use and easy to manage.

  The screen printing device can freely change the pressure, angle, moving speed, clearance (gap between the plate and workpiece), office computer (plate separation), etc. of the squeegee doctor (scraper), and it can be changed freely, with a high-definition pattern Can be printed.

  Next, a prototype of a hologram sheet having a vapor-deposited paper as a base and a half-tone underprint layer provided on the base was produced. Then, the hologram sheet was used as a blank material, and the blank material was cut into a necessary shape and assembled to prepare a packaging package. An example of the packaging package is shown in FIG.

  The illustrated packaging package 10 has a lower lid panel (not shown) and a flap (also not shown) folded inside the lower lid panel connected to the lower edge of the cylindrical body 11, An upper cover panel 12 and a flap 13 that is folded inside the upper cover panel are connected to the upper edge of the cylindrical body 11.

  Although the structure is a common packaging package, a hologram having excellent aesthetics is formed on the surface by the method of the present invention, and the product is good, has a high-class feeling and is easily attracted to the eyes. Therefore, a high PR effect can be expected when used for packaging display such as cosmetics.

  In addition, the package etc. which apply this invention should just be able to print on the surface, and a shape and structure in particular are not ask | required.

1 substrate 2 metallized paper 2a metallized layer 3 glossy paper 4 transparent resin film 5 underprint layer 6 screen mask 7 Kamiji printing dots _{7-1 first} dots 7 formed by halftone printing _{-2 second} Dots 10 formed by dot printing Packaging package 11 Cylindrical body 12 Upper lid panel 13 Flap

Claims (8)

The base material (1) is a vapor-deposited paper or glossy paper having a halftone base print layer (5) on the surface, or a transparent resin film having a base print layer (5) made of mirror ink on the surface.
On the base printing layer (5) of this base material, the first halftone dot printing is performed,
Next, the second halftone dot printing is performed by changing the angle of the screen mask (6) used for the first halftone dot printing within a range of 0.2 ° to 1 ° around one corner of the screen mask. In both the first halftone dot printing and the second halftone dot printing, screen printing that forms a pattern of a pseudo hologram by forming upper printing dots (7 ₋₁ , 7 ₋₂ ) having a convex curved surface. Hologram forming method. The hologram forming method according to claim 1, wherein the second top printing is performed by changing the angle of the screen mask (6) by θ = 0.5 ° from the first top printing. 3. The hologram forming method according to claim 1, wherein the dot is provided with an ink contact angle α of 90 ° or more with respect to the base printing layer. The hologram forming method according to claim 1, wherein the second top printing is performed using an ink obtained by adding glass powder to the ink used in the first top printing. The hologram according to any one of claims 1 to 4, wherein the screen mask (6) is made of a polyester mesh sputtered with stainless steel having a screen line number of 100 to 175 and a mesh of 355 to 460 mesh. Forming method. The hologram forming method according to claim 1, wherein the first top printing is performed using an ultraviolet curable ink. Pseudo hologram on the surface of the substrate (1) is formed, there is a pattern to the stereoscopic feeling and glittering feeling of the table surface, yet a method for manufacturing a hologram sheet that the pattern is changed by the observation angle, the pseudo hologram A method for producing a hologram sheet, which is formed by the hologram forming method according to claim 1. Method for producing a packaging packages assembled hologram sheet made in the process to package so hologram the blank after cutting in the blank appears on the outer surface of claim 7.

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