JPS60244536A - Paper for overhead projector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a transparent film-like paper (hereinafter referred to as "Overherad projector paper") used for a manuscript for an Overherad projector, and more specifically, a type-type paper. The present invention relates to overdraft projector paper used when creating a manuscript with a printing device such as a writer, printer, wire printer, or thermal transfer printer.

[Prior Art] Overhead projector paper has traditionally been required to have high light transmittance, and transparent films such as cellophane, acetate film, polyester film, and gelatin film can be used.

However, the common properties of the above-mentioned materials are that the surface is highly smooth to increase light transmittance, and the interior is not porous.

Due to the above-mentioned properties, conventional over-rad projector paper has the drawbacks of a low surface friction coefficient and low affinity with ink. Therefore, writing is generally done on Overherad projector paper using an oil-based pen.

With the development of office processing equipment such as computers and word processors in recent years, it is thought that there will be an increasing demand for creating manuscripts for use with overhead projectors using the above-mentioned office processing equipment.

Print output from devices such as computers and word processors is performed using printers, but if conventional over-the-top projector paper is used, sufficient print quality cannot be expected due to the above-mentioned ink affinity. Alternatively, although printers are equipped with a paper feeding mechanism, accurate paper feeding is often not achieved due to the low coefficient of friction of over-herad projector paper.

[Problems to be Solved by the Invention] The present invention relates to the drawbacks of the conventional Overhrad projector paper, and an object of the present invention is to provide an Overhrad projector paper suitable for printing equipment such as a printer.

[Means and effects for solving the problems] The present invention is a film-like paper having a high transmittance to light, which is provided with a layer of a substance imparting a high coefficient of friction on one side of a film base material. Overherad projector paper, featuring
Also, a film-like paper having high transmittance to light, in which a layer of a substance imparting a high coefficient of friction is provided on one side of the film base material, and a layer of a substance having high affinity with printing ink of a printer is provided on the other side. An object of the present invention is to provide an over-rad projector paper characterized in that it is provided with:

Since the over-rad projector paper of the present invention is provided with a layer of a substance imparting a high friction coefficient on one side of the film base material,
When the printer's paper feed mechanism sends paper, the frictional force between the paper and the paper feed mechanism increases, allowing accurate paper feeding. In addition, since a layer of a substance that has high affinity with the printing ink of the printer is provided on the film base material surface, the ink adheres well to the Overhead Projector paper.
It becomes possible to create a manuscript with sufficient print quality.

[Example] The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view of an over-hedra projector paper l according to the present invention, which is a transparent film-like paper of approximately A4 size.

FIG. 2 is an enlarged cross-sectional view of the Overherad projector sheet of FIG. 1. FIG.

In the figure, reference numeral 2 denotes a transparent polyester film approximately 80 g thick, which serves as the film base material for Overherad projector paper. Approximately 2JL-1o on the top surface of polyester film 2
11. An uncolored rubbery urethane resin is coated to a thickness of , forming the feeding friction layer 3.

As the film base material, a plastic film with high light transmittance is used, and polyethylene terephthalate,
In addition to polyester films such as polybutylene terephthalate, regenerated cellulose films (cellophane), cellulose acetate films (acetate films), gelatin films, etc. are used. Since the Overherad projector paper needs to have high light transmittance, the film base material itself must also have high light transmittance.

Further, as the material providing a high friction coefficient forming the feeding friction layer 3, a material having rubber elasticity is preferable, and a JIS rubber hardness of about 20 degrees to 85 degrees is suitable. In addition to the above-mentioned rubbery urethane resin', specific examples of such substances imparting a high friction coefficient include natural rubber, styrene-butadiene rubber, MMA-butadiene rubber, isoprene rubber, chloroprene rubber, silicone rubber, and ethylene-propyne rubber (EPM, EPR). ), rubber elastomers such as ethylene propyne terpolymers (EPT, EPDM), acrylic polymers mainly composed of acrylic esters, ethylene-vinyl acetate copolymers, and the like.

Since the feeding friction layer 3 needs to have high transmittance to light, it is desirable that it be uncolored and that the coating thickness be as thin as possible.

It is preferable that the friction coefficient of the surface of the feeding friction layer 3 of the over-rad projector paper of the present invention is 0.4 or more.
0.5-1 is more preferable.

The JIS rubber hardness of 20 degrees to 65 degrees has a friction coefficient of 0.4 or more.

If the coefficient of friction is too large, the frictional resistance when it comes into contact with the printer's paper guide will be large, requiring a large paper feeding force and increasing the burden on the printer's paper feeding mechanism.
Furthermore, depending on the situation, uneven feeding, skewing, etc. may occur. If the coefficient of friction becomes excessive in this way, add aminoblast resins such as urea-based or melamine-based resins, polyisocyanates, epoxy resins having reactive epoxy groups, etc. to the above-mentioned rubbery urethane resins as necessary. or fillers such as colloidal silica, talc, clay, inorganic fillers such as calcium carbonate, vinyl polymers such as polystyrene and polymethyl methacrylate, and organic particulate fillers such as cross-linked urea-formaldehyde. By adding an appropriate amount, the coefficient of friction can be adjusted.As for the addition of the filler, the type and amount of the filler should of course be selected within a range that does not impair transparency.

FIG. 3 is an enlarged cross-sectional view showing an example of an embodiment in which a layer of a substance imparting a high friction coefficient is provided on one side of a film base material, and a layer of a substance having high affinity with printing ink of a printer is provided on the other side.

In FIG. 3, 2 is a transparent polyester film with a thickness of about 801 L, 3 is a friction layer made of rubbery urethane resin and has a thickness of about 2 to 10 mm, and 4. It is a printing layer with a thickness of about 3JL to 8JL formed of a resin whose main raw material is wax. Carnauba wax is often used as an ink binder for ink ribbons in typewriters and printers, and is suitable for receiving ink that is printed as a character pattern on this over-rad projector paper during printing.

As the substance having high affinity with the printing ink of the printer forming the printing layer 4, a substance used as an ink binder of an ink ribbon is suitable, and in addition to carnauba wax, paraffin wax, microcrystalline wax, etc. Waxes, higher fatty acids such as stearic acid, lauric acid, palmitic acid, and their metal salts polyethylene.

Thermoplastic resins such as polypropylene, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, polyamide, polyacrylate, etc. can be used.

Needless to say, the coating should not be applied thicker than necessary in consideration of light transmittance.

The over-rad projector paper of the present invention is provided with a layer of a substance imparting a high friction coefficient on a transparent film base material, or a layer of a substance imparting a high friction coefficient and a layer of a substance having high affinity with the printing ink of a printer. Although it is tough, the paper as a whole has a high transmittance to light. What does high transmittance mean for light?

This means that it has a transmittance of 50% or more for visible light. This transmittance is preferably 80% or more, more preferably 65% or more.

Therefore, in order to ensure that the entire paper has a high transmittance of 50% or more for visible light, the material and thickness of the film base material, the layer of a substance that gives a high friction coefficient, and the layer of a substance that has a high affinity with the printing ink of the printer are selected. The material, composition, thickness, etc. of the material of the layer are adjusted. The thickness of the layer formed on the film base material surface is preferably from tg to 301 L, more preferably from 2 l to 10 l, in view of the properties such as transparency, friction properties, and affinity with ink.

FIG. 4 is a cross-sectional view showing an example of printing on the overhead projector paper according to the present invention using a thermal transfer printer.

In the figure, reference numeral 1 indicates an overboard projector paper, and reference numeral 5 indicates a thermal head provided on a carrier 6 that moves in the printing digit direction. A thermal transfer ink ribbon 7 housed in a cassette 8 is set on the carrier 6, and the ink ribbon 7 is set so as to pass between the printing paper 1 and the thermal head 5. A platen 9 is provided at a position facing the thermal head 5, and printing is performed by pressing the thermal head 5 against the platen 9 via the printing paper 1 and the ink ribbon 7.

At the bottom of the platen 9, there are provided a paper feed roller 10, a pinch roller 11 that presses the print paper 1 against the paper feed roller IO, and a paper guide 12 that guides the print paper, as shown in the figure.

The paper feed roller 10 is made of NBR (trill rubber) with a rubber hardness of about 60 degrees by rotating by one rotation in the direction of arrow A friction coefficient of 0.5 or more can be secured for ordinary paper, but for conventional over-rad projector paper (polyester film, etc.), the friction coefficient decreases and in some cases u, = 0.2
If the line feed is degraded to such an extent that line breaks cannot be made, or the feed becomes uneven, it may occur that the line is sent diagonally.

In the Overhead Projector Paper according to the present invention, the surface in contact with the paper feed roller 10 is coated with a material that provides a high friction coefficient, such as a rubbery urethane resin that can ensure a high friction coefficient. The paper feeding force via the frictional force from O can be sufficiently transmitted to the RAD projector paper, and the reliability of line feeding can be dramatically improved.

FIG. 5 compares the printing characteristics of the conventional over-herad projector paper and the embodiment. FIG. 5 is an enlarged view of the printing section of FIG. 4. FIG. 5(a) shows an example using a conventional over-the-top projector paper 13, in which three of the heating elements 14 provided on the surface of the thermal head 5 from the top are
This is where the current is applied to generate heat in order to print the second part, and the heat is transmitted from the heating element in the direction of arrow y, melting the thermal transfer ink 15 coated on the ink ribbon surface, and the current is turned off. Finish and apply thermal transfer ink 1 again
When it solidifies, it becomes compatible with the printing paper and is transferred to the printing paper.However, conventional overlay projector paper has a smooth surface and is made of a material such as polyester that is chemically very stable. There are some ink ribbons made of materials that have a weak affinity with the ink ribbon, and as shown in FIG. Print quality may not be obtained. FIG. 5(b) shows the state of transfer in this embodiment, and as shown in FIG. 5(d), the ink 15 of the ink ribbon 7 is applied to the ink-friendly material coated on the printing surface of the over-rad projector paper 1. is transferred, so that sufficiently good print quality can be obtained.

Further, in the case of an impact printer, the heat shown in FIG. 4 only becomes mechanical pressure, and the same excellent effects as in the case of the thermal transfer printer described above can be obtained.

[Effects of the Invention] The OVERHERAD projector paper of the present invention allows paper to be fed accurately within the printer, and allows high-quality printing to be obtained by the printer, making it highly reliable for OVERHERAD projectors. It is now possible to create a manuscript.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an over-projector paper according to the present invention, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a cross-sectional view showing another embodiment of the present invention, and FIG. Figure 5 is a schematic explanatory diagram showing the printing mechanism, and (a) and (C) show the case of printing on conventional over-RAD projector paper. (b) , (
d) shows a case in which the over-7-layer machine paper of the embodiment of the present invention is used. 1... Overhead projector paper 2... Transparent polyester film 3... Feed friction layer 4... Printing layer 5... Thermal head 6... Carrier 7... Thermal transfer ink ribbon 8... Cassette 9...Platen lO...Paper feed roller 11...Pinch roller 12...Paper guide 13...Conventional over rad projector paper 14
... Heating element 15 ... Thermal transfer ink (b) (d)

Claims (2)

[Claims] (1) An O/<-Het projector paper, which is a film-like paper having a high transmittance to light, and is characterized in that a layer of a substance imparting a high coefficient of friction is provided on one side of a film base material. (2) A film-like paper with high transmittance to light, with a layer of a substance imparting a high coefficient of friction on one side of the film base material, and a layer of a substance that has high affinity with the printing ink of a printer on the other side. Overherad projector paper characterized by having layers.