JP3945720B2 - Raw material for light shielding sheet and light shielding sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light-shielding sheet formed by penetrating a plurality of small hole groups, that is, a light-shielding sheet that is transparent from one direction and light-shielding from the other direction, and can display a pattern, and the light-shielding property The present invention relates to a raw material for printing a sheet.
[0002]
[Prior art]
Conventionally, regarding such a light-shielding sheet, various inventions have been disclosed with respect to the material, production method, and application. For example, Japanese Utility Model Publication No. 51-86049, Japanese Patent Publication No. 55-47588 and the like can be mentioned. In any of the light-shielding sheets disclosed therein, a pattern layer is first formed on a base sheet, and then a small hole group is formed on the entire surface. That is, in the case of sticking to the inner surface of the window, the surface pattern layer is formed and then two steps of drilling and adhesion are performed on the pattern surface. Moreover, when sticking to the outer surface of a window and using it, it is also possible to form both a front surface image layer and a back surface adhesive layer, and to perform a drilling process to the image surface after that.
[0003]
[Problems to be solved by the invention]
As a demand in recent years, it has been strongly desired that such a light-shielding sheet is easily manufactured by a small skilled and low-skilled person. However, it is extremely difficult to meet this demand with the conventional manufacturing method. That is, in the conventional manufacturing method, after the pattern layer is formed by the printing process, the drilling process or the post-processing including the drilling process and the adhesive process is performed. Of these, the printing process is currently represented by gravure rotary printing, a method that exhibits high efficiency, high yield, and low cost during mass production of many lots, an ink jet printer, a thermal sublimation transfer printer, There are both high-efficiency, high-yield, and low-cost methods, such as electronic copying (electrostatic copying) printers, which can be selected with either method. . On the other hand, with regard to post-processing, only processing methods with extremely low yield and production efficiency at the time of producing a small lot currently exist. In punching processing, it is necessary to clean and remove punching debris, and in adhesive processing, exhausting the diluted solvent and cleaning and disposing of residual adhesive are necessary, and the processing itself is difficult. The skill demand is also high. Therefore, there is no problem when a specialized manufacturer that performs all processes produces a lot of such light-shielding sheets, but if a low-skilled person tries to manufacture a small lot, difficulty, yield, production efficiency, It is extremely difficult in terms of labor and cost. Therefore, it seems that the printing process should be performed using an ink jet printer after changing the process sequence and finishing the adhesive process and punching process. However, it is surprisingly difficult and practical. there were.
[0004]
The reason for this is that in the case of sticking to the outside of the window for sheet back surface adhesive processing and sheet surface printing specifications, the release sheet is exposed at the opening of the sheet, so the printability and ink drying / fixing suitability are poor. . That is, when printing is performed on a base sheet that has been subjected to adhesive processing and perforation processing, printing, drying, and fixing are normally performed on the base sheet without any problem in areas other than the opening, but the release sheet is used in the opening. The surface of the normal release sheet is liquid repellent, non-absorbent and has a high contact angle to give the adhesive a release property, so what is the ink that has reached the opening? The entire amount is loaded on the release sheet in the opening without being absorbed. Moreover, because of the liquid repellency and the high contact angle surface, the ink overflows onto the base sheet outside the periphery of the opening and becomes a pattern stain. Also, the ink remaining in the opening does not adhere to the release sheet, and especially in the case of liquid ink, the absorption to the substrate contributes to the drying of the ink, so that the drying is also inhibited and the liquid state Followed. Therefore, after the printing is finished, if the ink on the base sheet is touched, the ink flows and adheres to the base sheet, and the pattern becomes dirty. Ink also adheres to the hands. When a plurality of printed sheets are stacked or wound, the undried ink on the underlying base sheet is adhered to the back surface of the overlying base sheet, resulting in a so-called blocking failure. In addition, in the case of sheet surface adhesive processing and sheet surface printing specification window inner surface sticking, printing on the adhesive processed surface is not possible at all with contact type printers such as thermal sublimation type and electronic copying type, Even if printing itself is possible with a non-contact type ink jet printer, the printability of the adhesive surface is extremely bad, and the ink bleeds after printing due to the semi-fluidity of the adhesive. It was impossible to put it to practical use. Therefore, in any case of external surface application and internal surface application, such a change in the process order has not been attempted in the conventional technical common sense.
[0005]
The present invention solves these conventional problems, and aims at producing such a light-shielding sheet with high yield and high production efficiency, even if a low-skilled person can easily produce such a light-shielding sheet in small lot production. An object of the present invention is to provide an original sheet for a light-shielding sheet, and to provide a light-shielding sheet using the same.
[0006]
[Means for Solving the Problems]
To achieve the above object, engagement Ru shielding raw for optical sheet of the present invention, a number of release sheet through a back surface adhesive layer of the substrate sheet which small holes are uniformly dispersed bored The pressure-sensitive adhesive layer has the same opening as the small holes of the base sheet, and the release sheet is provided with a release agent layer on the surface side in contact with the pressure-sensitive adhesive layer. It is characterized by Rukoto number of minute holes through release agent layer is bored.
[0007]
The original sheet for light-shielding sheet of the present invention having the above-described structure is subjected to a desired pattern from the front side of the base sheet by an appropriate means to become a light-shielding sheet of the final product. In use, the release sheet is peeled off, and the perforated base sheet with a pattern on the front side is attached to a window, a transparent partition, or the like by the adhesive layer on the back side.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 is a sectional view schematically showing the basic configuration of the engagement Ru shielding light sheet for raw to the present invention, the light-shielding sheet for raw B as illustrated, the adhesive on the back surface of the substrate sheet 1 In the layer structure in which the release sheet 3 is adhered via the adhesive layer 2, a large number of small holes 1 a are uniformly dispersed and drilled in the base sheet 1, and the base sheet 1 is also provided in the adhesive layer 2. The same opening 2a as the small hole 1a is provided.
[0009]
As a material of the base sheet 1, polyester resin sheets such as polyethylene terephthalate and polybutylene terephthalate, polyolefin resin sheets such as polyethylene and polypropylene, paper such as fine paper, thin paper, Japanese paper, and synthetic paper are used. The layer structure of the base sheet 1 may be a single layer of these sheets or a laminate of two or more layers. A total thickness of about 25 to 200 μm can be used. The base sheet 1 may be in the form of a single sheet cut to a fixed size or a wound continuous belt-like long continuous sheet (web). The base sheet 1 may be transparent or opaque, chromatic or achromatic, and when a transparent sheet is used as the base sheet 1, a light color hiding layer and a dark color hiding layer are formed with printing ink at the time of printing. To do. Further, if the base sheet 1 is composed of a laminate of a sheet kneaded with a light-color concealing pigment and a sheet kneaded with a dark-color concealing pigment, a light-color concealing layer and a dark-color concealing layer are formed during printing. do not have to.
[0010]
The small holes 1a to be distributed and drilled in the base sheet 1 have a diameter of about 0.5 to 2 mm, and the shortest distance between adjacent small holes is about 0.5 to 2 mm. Is preferable. And the center of the small hole 1a can be arrange | positioned at the lattice point of a square lattice, a triangular lattice, and a hexagonal lattice, for example. Further, the shape of the small hole is typically a circle, but other shapes such as a square, a triangle, and a hexagon are also possible.
[0011]
Moreover, you may provide the primer layer for improving various performances, such as printability, water resistance, heat resistance, concealment property, and light resistance, on the base material sheet 1 as needed. Examples of the primer layer include the following.
(1) When paper is used for the base sheet 1 and a pattern is formed with an aqueous liquid ink (ink having water as a main component as a diluent solvent) such as ink for ink jet printing, Sizing agent selected from rosin resin to improve ink wettability, starch, casein, polyvinyl alcohol, melamine and urea initial condensate, etc., clay to improve concealability, surface smoothness and printability Then, a primer appropriately blended with fillers such as talc, magnesium carbonate, barium sulfate, titanium oxide, water-resistant, latex (suspension) such as acrylic to improve printability is applied. The application amount of this primer is about 1 to ²⁰ g / m ² .
(2) When a resin sheet is used as the base sheet 1 and a pattern is formed with the water-based ink as described above, colloidal silica, alumina sol, as disclosed in JP-A-2-147233, etc. An organic-inorganic composite formed by reacting inorganic colloidal particles such as lithium silicate sol with an ethylene monomer, a silane monomer and a hydrophilic monomer, as disclosed in JP-A-63-27251, etc. Further, there are those in which colloidal silica is dispersed in a rubber resin or a styrene resin.
(3) When paper or a resin sheet is used for the base sheet 1 and transfer printing is performed with a heat-sensitive sublimation dye ink on the base sheet 1, a polyester resin, a polyvinyl chloride resin, a vinyl chloride / vinyl acetate copolymer or the like Is applied to form a receiving layer. The coating amount is usually about 1 to ²⁰ g / m ² . As a matter of course, the primer treatment can be omitted when the base sheet itself is formed from the resins listed as the receiving layer. In addition, as a heat-sensitive sublimation dye, well-known various dyes used with a thermal transfer printer can be used, and a disperse dye is typical.
[0012]
For the pressure-sensitive adhesive layer 2, any conventionally known pressure-sensitive adhesive tape or pressure-sensitive adhesive used in seals can be used. For example, rubber resins such as polyisoprene rubber, polyisobutyl rubber, styrene butadiene rubber, and butadiene acrylonitrile rubber. , (Meth) acrylic acid ester resin, polyvinyl ether resin, polyvinyl acetate resin, polyvinyl chloride / vinyl acetate copolymer resin, polyvinyl butyral resin, etc. Appropriate tackifiers, coumarone-indene trees, etc. are added to any resin system, and softeners, fillers, anti-aging agents, crosslinking agents, etc. are added as necessary. To do.
[0013]
In the case of making an original fabric having the structure as shown in FIG. 1 , the adhesive layer 2 and a temporary release sheet are laminated on the back surface of the base sheet 1 and then punched, and then the temporary release sheet and the adhesive in the hole are formed. It is easier to make a layer by removing the adhesive layer, peeling and removing the temporary release sheet, and then laminating the pressure-sensitive adhesive layer 2 and the release sheet 3 facing each other.
[0015]
The release sheet 3 is a sheet whose surface has releasability with respect to the pressure-sensitive adhesive layer 2, and the material thereof is a polyester resin such as polyethylene terephthalate or polybutylene terephthalate, or a polyolefin resin such as polypropylene, polyethylene or polymethylpentene. A resin sheet such as polyvinyl chloride resin, paper such as high-quality paper and kraft paper, and a sheet such as non-woven fabric are used. The thickness is about 12 to 50 μm. If the sheet material itself has sufficient releasability with respect to the pressure-sensitive adhesive layer 2, it may be used as it is, but if releasability is insufficient (in particular, in the case of paper, this is generally the case). ) Is provided with a release agent layer on the surface side in contact with the adhesive. As the release agent layer, an organic silicon resin, a melamine resin, a polyolefin resin, a fluorine resin such as a fluorine resin, wax, or the like is used. Or the composition which added these resin with high mold release property in a suitable resin binder is used. The layer is formed by a known coating method such as gravure roll coating or extrusion coating. The release agent layer usually has a thickness of about 1 to 10 μm.
[0016]
In the raw sheet B for a light-shielding sheet in FIG. 1 , the pressure-sensitive adhesive layer 2 is removed at the small holes 1a of the base sheet 1 and the release sheet 3 is directly exposed to the opening 2a. As the sheet, a sheet having releasability with respect to the pressure-sensitive adhesive layer 2 and further having absorptivity, adsorptivity or fixability with respect to the ink used is selected. Examples of such sheets are as follows.
(1) When liquid ink is used, a large number of micropores are formed on the surface of the release sheet 3 on the side of the pressure-sensitive adhesive layer 2 to absorb ink that has entered from the opening 2a of the pressure-sensitive adhesive layer 2 by capillary action. . More preferably, the release sheet 3 is made of a porous absorbent material such as paper or non-woven fabric, and the release agent layer is formed on the surface in order to impart release properties to the adhesive, It is preferable to pierce the mold release agent layer to form a micropore that reaches the layer of the porous absorbent material. Further, in order to prevent the absorbed ink from escaping to the back surface of the release sheet 3, it is preferable that the micropores are stopped halfway through the porous material layer and not reach the back surface.
(2) When powder ink such as toner is used, it is effective to disperse and form a large number of micropores penetrating the release agent layer in the release agent layer, for example, as in (1) above.
(3) When using heat-sensitive sublimation dye ink, remove resin that is receptive to sublimation dye, such as polyester resin, vinyl chloride vinyl acetate copolymer, polyvinyl chloride resin, vinyl acetate resin. Add to mold.
[0017]
The pattern to be formed on the surface side of the base sheet 1 includes: (1) advertising, advertisement, motto, store name, calendar and other characters and figures, (2) person-like, landscape-like photographic images, and (3) wood grain pattern , Surface patterns of natural cosmetics such as stone patterns, (4) full-color solid layers (light-color masking layer, dark-color masking layer, or transparent protective layer that protects the pattern surface described later), etc., and combinations thereof May be appropriately adopted as necessary. The pattern may be formed by an ink jet printer, an electronic copying (xerographic) printer, a heat-sensitive sublimation transfer printer, gravure printing, offset printing, or the like. The ink used for forming the pattern may be one obtained by adding a known dye or pigment or other colorant to a known binder resin. However, when used in places exposed to sunlight, such as outdoors, iron oxide, titanium oxide, carbon black, yellow lead, mercury sulfide are used as pigments in order to prevent discoloration and fading of the pattern and to provide light resistance. Inorganic pigments such as cadmium and ultramarine, and organic pigments such as phthalocyanine blue, quinacridone, and isoindolinone are used. As the binder, acrylic resin, fluorine resin, vinyl chloride / vinyl acetate copolymer, and the like are used. If necessary, benzotriazole, fine powdered cerium oxide or the like as an ultraviolet absorber, or a light stabilizer such as a hindered amine radical scavenger is added. Moreover, as the adherend of the light-shielding sheet formed by providing a pattern on the original fabrics A and B for the light-shielding sheet, there are buildings such as windows, residences, stores, offices, etc. of automobiles, trains, trains, ships, airplanes, etc. Typical examples are windows, doors, and transparent partitions.
[0018]
The above-mentioned light-shielding sheet has a one-way shielding property that is transparent from one direction and light-shielding from the other direction, and the side that is pasted on the brighter side from the point of clarity of the surface pattern ( As described above, it is preferable to color the light-colored concealing layer on the outdoor side in terms of windows and the dark-colored concealing side on the darker side (indoors in terms of windows). The light colors include white, gray, high lightness / low chroma (ie whitish) green, blue, yellow, red, or metallic luster, and the dark color is black, low lightness (ie blackish). There are green, blue, yellow, red and so on. A known dye or pigment is used as the colorant.
[0019]
【Example】
Hereinafter, an example is given and demonstrated.
[0020]
Example 1
A laminated sheet made by laminating a 250 μm thick white polyester sheet kneaded with titanium dioxide pigment and a 250 μm thick black polyester sheet kneaded with carbon black pigment is used as the base sheet, and this white polyester sheet side A primer obtained by adding 100 parts by weight of polyvinyl alcohol to 100 parts by weight of an inorganic / organic composite resin (“Movinyl 8030” manufactured by Hoechst Chemical Co., Ltd.) obtained by reacting an acrylic monomer with colloidal silica. A water-based ink absorbing layer was formed by applying a dye. Furthermore, an acrylic pressure-sensitive adhesive is applied to the black polyester sheet side, and after drying, a temporary release sheet is laminated on the pressure-sensitive adhesive layer, and the temporary release sheet, the pressure-sensitive adhesive layer, the base sheet and the water-based ink absorption A large number of small holes were distributed through all of the layers. The diameter of the small holes was 1 mm, the distance between the centers of the small holes was 2 mm, and the centers of the small holes were arranged so as to be positioned in a triangular lattice having one side (lattice constant) of 2 mm. On the other hand, a polyethylene release agent layer formed by extrusion coating on one side of a fine paper was used as a release sheet, and a number of micropores were drilled on the release agent layer side surface by a needle valve. . Specifically, 350 to 450 μm fine holes were drilled at a rate of 60 to 650,000 holes / m ^{2 in} a penetrating state halfway through the fine paper. Then, the temporary release sheet is peeled from the pressure-sensitive adhesive layer provided on the black polyester sheet side of the base material sheet, the pressure-sensitive adhesive layer in the small holes of the base material sheet is removed, and the exposed pressure-sensitive adhesive layer is separated. The mold sheet was bonded as shown in FIG.
[0021]
A pattern was formed on the surface of the raw material for the light-shielding sheet thus produced by an ink jet printer. In this case, the ink that reached the release sheet through the small holes in the base sheet was absorbed by the release sheet by capillary action of the micropores in the release sheet. The ink did not overflow outside the hole, and even when the hole was touched by hand, the ink did not adhere to the hand and became dirty.
[0022]
(Example 2)
High quality paper was used as a base sheet, and a vinyl chloride / vinyl acetate copolymer was gravure coated on the surface thereof to form a primer layer. Furthermore, an acrylic pressure-sensitive adhesive is applied to the side opposite to the primer layer, and after drying, a temporary release sheet is laminated on the pressure-sensitive adhesive layer, and the temporary release sheet, the pressure-sensitive adhesive layer, the base sheet and the primer layer A large number of small holes were dispersed and drilled through all of these. The diameter of the small holes was 1 mm, the distance between the centers of the small holes was 2 mm, and the centers of the small holes were arranged so as to be positioned in a triangular lattice having one side (lattice constant) of 2 mm. On the other hand, as a release agent layer on the polyester sheet surface, a melamine resin, an acrylic resin, and a resin mixed with vinyl chloride / vinyl acetate copolymer are applied and baked and cured as a release sheet. A number of micropores were drilled on the surface of the release agent layer side by a needle valve. Specifically, 350-450 μm micropores were drilled at a rate of 60-650 thousand / m ^{2 in} a penetrating state partway through the polyester sheet. Then, the temporary release sheet is peeled from the pressure-sensitive adhesive layer provided on the black polyester sheet side of the base material sheet, the pressure-sensitive adhesive layer in the small holes of the base material sheet is removed, and the exposed pressure-sensitive adhesive layer is separated. The mold sheet was bonded as shown in FIG.
[0023]
On the surface of the raw sheet for the light-shielding sheet thus prepared, a pattern was formed by a thermal transfer printer that sublimates the sublimable disperse dye on the transfer ribbon by patterning with a thermal head. In this case, the ink that reached the release sheet through the small holes in the base sheet was absorbed by the release sheet due to the capillary action of the micropores in the release sheet and the dye acceptability of the release agent layer itself. The ink did not overflow outside the hole, and even when the hole was touched by hand, the ink did not adhere to the hand and became dirty.
[0024]
(Example 3)
A colored toner image is transferred from the photosensitive drum by an electronic copying printer on the surface of the light shielding sheet similar to that in Example 1, heated to melt the toner, and then cooled and fixed. Formed. In this case, the ink that reached the release sheet through the small holes in the base sheet was absorbed by the release sheet by the capillary phenomenon of the micropores in the release sheet. The ink did not overflow outside the hole, and even when the hole was touched by hand, the ink did not adhere to the hand and became dirty.
[0026]
【The invention's effect】
As described above, the raw material for a light-shielding sheet of the present invention is obtained by sticking a release sheet to the back surface of a base sheet in which a large number of small holes are uniformly dispersed and formed through an adhesive layer . viscosity adhesive layer the same opening as the pores of the substrate sheet provided, by leaving bored a number of minute holes through release agent layer on the releasing agent layer provided on the release sheet, the exposed By making the release sheet into a form with ink absorbency, adsorptivity or fixability, printing processing after perforating and sticking the sheet was considered impossible by conventional common sense Therefore, even a low-skilled person can easily produce with a high yield and a high production efficiency at the time of small lot production. In addition, the light-shielding sheet obtained by forming a pattern on the surface of the raw material for the light-shielding sheet has a clear pattern without melting ink or ink smearing around the micropores.
[Brief description of the drawings]
[Figure 1]
The basic configuration of the engagement Ru shielding light sheet for raw to the present invention is a cross-sectional view schematically showing.
[Explanation of symbols]
A, B Material for light shielding sheet 1 Base sheet 1a Small hole 2 Adhesive layer 2a Opening 3 Release sheet

Claims (3)

A release sheet is attached to the back surface of the base sheet in which a large number of small holes are uniformly dispersed and formed through an adhesive layer , and the adhesive layer has the same opening as the small holes of the base sheet. , the release sheet release agent layer is provided on the surface side in contact with the adhesive layer, characterized Rukoto on its release agent layer are a number of small holes through release agent layer is bored A raw material for a light-shielding sheet. Hara light shielding sheet according to claim 1, characterized in Rukoto resin with receptive to sublimation dye in the release agent layer is added anti.   The light-shielding sheet formed by forming a pattern on the surface of the raw material for light-shielding sheets according to claim 1 or 2.

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