JP2548534B2 - Film for OHP - Google Patents

Description

The present invention relates to a film for OHP (overhead projector), and more specifically, it is laminated with a thermal transfer paper having a coloring material layer containing a sublimable dye, The present invention relates to a film for OHP used in a thermal recording method in which a sublimation dye of a thermal transfer paper is sublimated by heating by a head or the like and is transferred to perform required color recording.

[Conventional technology]

In recent years, due to the spread of personal computers, televisions, VTRs, video discs, etc. as information terminals and the use of color displays, the demand for printers that output these still images as color images on transparencies has increased year by year. There is. The recording method of this full-color printer includes an electrophotographic method, an inkjet method, a thermal transfer method, and the like. Among them, the thermal transfer method is often used because it has no noise and is easy to maintain. This thermal transfer is composed of a solidified color ink sheet and an image receiving paper, and the ink is thermally melt-transferred or sublimated to the image receiving paper by thermal energy controlled by an electric signal of a laser or a thermal head to form an image. It is a recording method. The thermal transfer system includes a thermal fusion transfer type and a sublimation transfer type. The heat-melt transfer type uses an ink sheet in which a pigment or dye is bound with a hot-melt wax and transfers the pigment or dye to the image receiving paper together with the wax melted by the thermal energy of the thermal head. It has the drawbacks that it is difficult to obtain a tone and that a good hue cannot be obtained due to the transferred wax. On the other hand, the sublimation transfer type using a sublimation dye is an application of a conventional sublimation transfer printing technique, and generally uses a sheet in which a disperse dye that is relatively easy to sublime is bound with a binder, and the dye is heated by thermal energy of a thermal head. Is sublimated and transferred to an image receiving paper to obtain an image. At that time, since the sublimation dye sublimates according to the thermal energy of the thermal head, there is an advantage that halftone can be easily obtained and gradation can be controlled arbitrarily, and it is considered to be the most suitable method for a full color printer. There is.

As the image receiving paper in this sublimation transfer type thermal transfer system,
As described in JP-A-51-15446, it is basically possible to use various transparent plastic films as OHP films, as well as plain paper can be used. However, the plastic film alone cannot obtain a sufficient color density, and since the fixing property of the sublimable dye is poor, the fading phenomenon over time is remarkable, which is not preferable.
Therefore, generally, a dyeing resin layer made of a thermoplastic resin capable of being effectively dyed with a sublimable dye represented by a saturated polyester resin, a polyamide resin, an epoxy resin or the like is provided on a plastic film and used. However, when printing, the temperature of the thermal head is generally 300 ℃.
Since both the binder of the thermal transfer paper and the dyeing resin of the OHP film are softened by the heat, they are fused and the running becomes impossible, and abnormal transfer of the ink layer occurs. was there. Therefore, in order to prevent this fusion, a part of the dyeing resin is cured with an appropriate curing agent, or a resin with high heat resistance and high releasability such as silicone resin or melamine resin is used as the dyeing resin. Measures such as being provided above are taken.

However, since the OHP film thus obtained is almost colorless and transparent, it is difficult to optically distinguish it from the color of the lining,
There is a problem that it is difficult to perform accurate cueing, and a positional deviation occurs when printing three colors of cyan, magenta, and yellow in a frame sequential manner. In addition, since it is difficult to identify the front and back of these OHP films, there is a risk of setting them in the printer upside down, in which case a good image cannot be obtained, and since fusion prevention processing has not been performed. In addition, the heat-sensitive transfer paper and the OHP film are fused to each other, making it impossible to run, which may cause a printer failure, or the heat-sensitive transfer paper may be broken and cannot be used thereafter. Furthermore, if these OHP films are provided with detection markers that can be optically detected, when they are projected by an overhead projector, the light is blocked and they become shadows. It might be difficult to recognize.

[Problems to be solved by the invention]

The problem to be solved by the present invention is that this type of conventional OH
It is to solve each difficulty of P film, more specifically, there is no misalignment when printing three colors of cyan, magenta, and yellow in a frame sequential manner, and even if they are set upside down, problems due to melting occur Moreover, it is to provide an OHP film that does not block light when actually projected by an overhead projector.

[Means for Solving Problems] This problem is that peeling is possible from a thermal transfer paper having a coloring material layer containing a sublimable dye, to an OHP film having a dyeing resin layer transferred by heating. Made of various pressure-sensitive adhesive sheets, and has an adhesive strength of 10-100 for OHP films.
This is achieved by partially providing an optical detection marker of 0 g / cm on the dyeing resin layer side. [Structure and Action of the Invention] The OHP film of the present invention is one in which an optical detection marker composed of a peelable pressure-sensitive adhesive sheet is partially provided in the dyeing resin layer of the OHP film. The optical detection marker composed of this peelable adhesive sheet, the detection marker that can be optically detected is printed by a printer, after which it can be easily peeled and removed by hand, and In fact, when the image is shot with an overhead projector, the light is blocked by the detection marker so that no shadow is produced. A detection marker composed of such a peelable adhesive sheet has a pressure-sensitive adhesive (1) partially or on one surface of the detection marker sheet (2) as shown in FIGS. 1 and 2. It is obtained by coating the entire surface. Furthermore, in order to facilitate the peeling of the detection marker, it is desirable to provide the detection marker with a dry edge. As shown in Fig. 2, the dry edge is a part of the end of the detection marker where there is no pressure sensitive adhesive, and it can be easily grasped by hand when the detection marker is peeled off. is there. The shape and number of the dry edges are the OHP film (3) for the detection marker.
May be optionally provided as long as the retention of
The OHP film of the present invention is obtained by partially adhering the detection marker made of this peelable adhesive sheet to the dyeing resin layer side of the OHP film (3).

By partially providing the detection marker on the dyeing resin layer side, not only the front and back but also the top and bottom can be identified.

As the pressure-sensitive adhesive (1) used for this detection marker, any one generally known as a pressure-sensitive adhesive can be used, for example, a rubber-based or acrylic-based pressure-sensitive adhesive can be used, These are solutions, emulsion solutions,
It is provided by coating the detection marker sheet (2) with an appropriate coater in an appropriate state such as water dispersion or solvent-free. The adhesive strength of the detection marker composed of the adhesive sheet obtained by applying these pressure-sensitive adhesives (1) to the OHP film (3) is 10 to 1000 g / cm, particularly preferably 30 to 500 g / cm. If the adhesive strength of the detection marker to the OHP film (3) does not reach 10 g / cm, the holding property may be poor, and there is a risk of peeling before or during printing, and the adhesive strength is 1000 g / cm. If it is larger than cm, the easy peelability by hand tends to decrease.

Next, as the detection marker sheet (2), various sheet-like sheets which are not colorless and transparent in principle can be used.
A colored plastic film, an aluminum vapor deposition plastic film, etc. can be mentioned. Further, a coloring agent may be applied to various transparent plastic films together with a binder, or the coloring agent may be added to the pressure-sensitive adhesive (1).

In this way, the OHP film provided with the optical detection marker made of a peelable adhesive sheet is an optical reading device such as a transmission type or a reflection type and its optical density, hue, and polarization are turned on. The position of the detection marker can be accurately read by detecting it as an OFF signal.
By inserting information regarding the start-up of the thermal head in this detection marker, a good image with no misalignment can be obtained when the three colors of cyan, magenta, and yellow are printed in the frame order. And the OHP film provided with such a detection marker has the above-mentioned function and can visually and tactually identify the front and back depending on the presence or absence thereof. It is also possible to have a function that can do.

Therefore, as the detection marker capable of discriminating between the front and the back, it is sufficient if the front and back can be discriminated, and various forms can be widely adopted. The typical form is as follows.
For example, a configuration in which the detection markers are provided in a non-axisymmetric manner so that the positions of the detection markers differ depending on the front and back sides, and a composition containing a coloring agent to enable the front and back to be identified in the detection marker sheet (2) The object is applied to a colored plastic film or paper, or two or more compositions composed of different colorants are applied to both sides or one side of the film so that the optical density and the hue are different on the front and back sides. In addition, two or more kinds of adhesive sheets having different optical densities and hues may be used to provide a multilayer structure on one side of the OHP film, or a separate mode may be provided on both sides. In this way, OHP films with different detection markers depending on the front and back sides can be set upside down by inserting the difference in information obtained from the optical reading device set at a specific position of the printer into the paper feeding mechanism. That can be reliably eliminated optically.

The OHP film of the present invention will be described in more detail below with reference to FIGS.

3 to 5 are sectional views showing the setting positions of the detection marker (4) made of a peelable adhesive sheet. 3 shows a part of the detection marker (4) on the dyeing resin layer (6) provided on the base film (5), and FIG. 4 shows the base film (5). A part of the dyeing resin layer (6) provided above is replaced with a detection marker (4). Further, in FIG. 5, detection markers (4) are provided on both sides of the OHP film.

The examples shown in FIGS. 3 to 5 are examples of the present invention, and the detection marker (4) is provided on the dyeing resin layer side to which the sublimable dye is transferred. 2 on the same side
You may provide more than one. That is, the detection marker (4) may be provided in at least one place on the side where the dyeing resin layer on which an image is formed is provided.

Next, as the colorant in the composition containing the adhesive used for the detection marker (4) of the present invention, an inorganic pigment, an organic pigment, a dye or the like can be used. And white pigments such as magnesium oxide, zinc white, and calcium carbonate, and black pigments such as carbon black. Examples of the binder include various thermoplastic resins such as polyester resin, polyamide resin, and acrylic resin, styrene-butadiene rubber, and butyl rubber, but are not limited to these.

The composition composed of these colorants and binders may be dispersed or dissolved in a suitable solvent, or water if it is water-soluble, and then applied with a suitable coater.

Any transparent plastic film can be used as the base film (5) used for the OHP film of the present invention, and examples thereof include a polypropylene film, a polyester film, a polycarbonate film, and a polyamide film. You can, but you're not limited to these.

Further, as the dyeing resin layer (6), a wide variety of dyes can be used as long as they have sufficient dyeability to sublimation dyes, and examples thereof include polyester resin, epoxy resin, polyamide resin, acid acid cellulose resin, Acrylic resins and the like can be mentioned, and these can be provided by dissolving them in a suitable solvent and coating them on the above intermediate layer with an arbitrary coating machine. If desired, these adhesive resin layers may be partially crosslinked.

The thermal transfer paper is a laminate of a sublimable dye with an appropriate binder on an arbitrary substrate such as polyester film or condenser paper, and the sublimation dye is sublimated and transferred by heating a thermal head or the like. If so, it is widely used.

〔The invention's effect〕

As described in detail above, the optical detection marker including the peelable adhesive sheet according to the present invention is provided.
Since the OHP film has a detection marker, when the three colors of cyan, magenta, and yellow are printed in a frame-sequential manner according to the position and information of the detection marker, the head is accurately cued and no positional deviation occurs, and It can be set upside down to prevent problems such as fusion.

Furthermore, since this detection marker is composed of a peelable pressure-sensitive adhesive sheet, it can be easily peeled off by hand after printing, and at this time there is no adhesive residue, and since it is a pressure-sensitive type, it can be re-adhered, It can be re-adhered for re-identification to identify confusing images.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views of a peelable detection marker, and FIGS. 3-5 are cross-sectional views showing the setting position of the detection marker. 1 ... Pressure-sensitive adhesive 2 ... Detection marker sheet 3 ... OHP film 4 ... Detection marker 5 ... Base film 6 ... Dyeing resin layer

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Gogo 1-2-2 Shimohozumi, Ibaraki City Nitto Electric Industrial Co., Ltd. (72) Inventor Hiroyuki Oka 4026 Kujicho, Hitachi Hitachi Manufacturing Co., Ltd. Hitachi, Ltd. In the laboratory (72) Inventor Rieko Kusaka 4026 Kujimachi, Hitachi City Hitachi Ltd. Hitachi Research Laboratory (56) References JP 62-176896 (JP, A) JP 59-204593 (JP, A) JP-A-59-209167 (JP, A) JP-A-60-220794 (JP, A)

Claims (2)

(57) [Claims] 1. An OH having a dyeing resin layer transferred by heating from a heat-sensitive transfer paper having a color material layer containing a sublimable dye.
The film for P is composed of a peelable pressure-sensitive adhesive sheet, and has an adhesive force to the film for OHP of 10 to 1000 g / c.
An OHP film characterized in that an optical detection marker of m is partially provided on the dyeing resin layer side. 2. The OHP film according to claim 1, wherein the detection marker in the OHP film has a dry edge.