JPS61195887A - Ohp film and image-forming method - Google Patents

Abstract

PURPOSE:To provide an original film for forming a negative image thereon and enabling an image to be formed thereon not only by thermal copying but also by handwriting, by a method wherein a thermoplastic resin layer having a matter-finished surface and a Vicat softening point of not higher than 100 deg.C is provided on a base consisting of a transparent synthetic resin film. CONSTITUTION:The thermoplastic resin layer 2 for forming images thereon is formed of a thermoplastic synthetic resin which is preferably transparent and has a Vicat softening point (ASTM D-1525) of not higher than 100 deg.C, preferably, 50-80 deg.C. The resin layer 2 is provided in a thickness of 20-80mum on one side of the base 1, and the surface 2A of the layer 2 is matte finished to be light-nontransmitting, so that light dimmed by a Fresnellens is irregularly reflected by the matte-finished surface, and can not pass through the layer 2. The resin layer 2 is provided on the base 1 by extrusion coating.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an OHP projection film and an image forming method for forming an image on the film.

(Background of the invention) Recently, schools, government offices, companies, etc. are using 0)- as visual teaching aids.
Many companies have introduced IP (Over Rad Projector), and the projection film used for this 0) (P) is usually a laminated film made by laminating transparent resin films, and this film has By overlapping documents for copying and irradiating them with near-infrared rays, an uneven image is formed on the surface of the film.

That is, an original film or sheet and a desired copy document are superimposed, and a light beam rich in near-infrared rays is irradiated with a flash using a xenon lamp or the like, or a tungsten incandescent lamp is used to overlay the original film or sheet. Original Fino with finely uneven images formed on the surface of the sheet! The object to be irradiated is for example projected by a projector such as an overhera 1: projector.

However, in this image forming method, the original film is formed as a positive type film for the original for copying, but recently, in order to expand the variation of OHP use, a negative type original film is formed for the original for copying. It tends to be desired.

Furthermore, in terms of usability, there was a demand for an original film that would allow the user to handwrite necessary information using a solvent pen or the like after forming an original image by thermal copying, that is, a negative type original film that could be used in combination with thermal copying and handwriting.

(Object of the Invention) The present invention provides an original film for OHP projection, in which an image is of a negative type and can be formed not only by thermal copying but also by handwriting. Its purpose is to.

Furthermore, it is an object of the present invention to provide an image forming method for easily and clearly forming an original image on the original film.

(Structure and Effects of the Invention) In order to achieve the above object, the OHP presentation film according to the present invention has a matte finish on the surface and a thermoplastic resin layer with a Vicat softening point of 100°C or less, which is transparent. It is characterized by being laminated on a support made of a synthetic resin film.

Furthermore, the non-light-transparent film has a satin finish, in which a thermoplastic resin layer having a Vicat softening point of 100'C or less and having a matte finish on the surface is laminated on a support made of a transparent synthetic resin film. It is characterized in that a portion of the processed surface is selectively melted in correspondence with the original image to form a smooth surface, so that only the portion corresponding to the original image portion transmits light.

That is, since the OHP projection film according to the present invention has a matte finish on its surface, it is a non-transparent film that does not transmit light obtained through a Fresnel lens such as OHP before image formation. However, if a copy original is placed on the satin-finished surface and irradiated with flash light, the satin-finished surface is melted and smoothed in correspondence with the image area, and becomes transparent to light. Furthermore, since the original film 3 transmits light only in the original image area of the copy original, that is, the part that absorbs light, it is possible to obtain a negative type original film for the copy original, thus making it possible to use OHP. This has the advantage that various variations can be made during the process.

Furthermore, in addition to the image formation by thermal copying described above, if a desired image is drawn on the satin surface of the surface of the original film using a solvent pen containing a solvent that dissolves thermoplastic synthetic resin, the satin surface will be created corresponding to the calligraphy area. is dissolved and smoothed, and this area becomes transparent to light.

Therefore, images can be easily formed on the original film.

In this way, according to the present invention, it is possible to easily obtain a negative type drawing film for a copy original by using thermal copying or a solvent pen, and furthermore, by thermal copying, it is possible to easily obtain a drawing film of a negative type on which an image has been formed. With a solvent pen,
Since supplementary information can be added by hand, the usability is improved and it is very practical.

(Description of Embodiments) Embodiments of the present invention will be described in detail based on the accompanying drawings. First, FIG. 1 shows a sectional view of an OHP projection film according to the present invention, in which reference numeral 1 indicates a support made of a transparent resin, and 2 indicates a thermoplastic synthetic resin layer for image formation.

More specifically, the support 1 is made of a plastic film that is highly transparent and has a relatively high melting point, such as polyethylene terephthalate, polycarbonate, polypropylene, polyvinyl chloride, triacetate, polystyrene, etc. The thickness is set to 50 to 200μ.

By the way, in terms of workability, use something that is rigid.

Next, the thermoplastic synthetic resin layer 2 for image formation is preferably transparent, and has a Vicat softening point (
ASTM, D-1525> is 100°C or less, preferably 50 to 80°C, thermoplastic synthetic resin, such as ethylene-ethyl acrylate copolymer (EEA), modified polyethylene, ionomer resin, soft vinyl chloride resin, ethylene vinyl acetate ( EVA).

In addition, the layer thickness of this thermoplastic synthetic resin layer 2 is 20 to 80 μm.
The film is laminated on one side of the support 1 to a thickness of .

Furthermore, the surface 2A of the thermoplastic synthetic resin layer 2 has a satin finish (
Pine 1~) has been processed, and the light modulated by the Fresnel lens is diffusely reflected on this pear surface, and the light does not pass through, making it non-transparent.

By the way, the method for forming a laminate of the support 1 and the thermoplastic resin layer 2 is performed by applying the thermoplastic synthetic resin layer 2 onto the support 1 by extrusion coating.

In addition, the method of forming a matte finish on the surface of the thermoplastic synthetic resin layer 2 is generally performed by pressing with a matte roller or the like immediately after the thermoplastic synthetic resin layer 2 is extrusion coated, or by sandblasting. A satin finishing method is used.

Note that since no adhesive is used in laminating the support 1 and the thermoplastic synthetic resin layer 2, the two types of synthetic resins to be combined must be compatible with each other or have good adhesive properties. Depending on the case, the support 1 may be subjected to a corona discharge treatment or an auxiliary agent such as polyethyleneimine may be used.

Next, a method for forming the OHP projection film image obtained in this manner will be described.

First, the copy document 4 is placed on the original film 3, and in this case, the matte surface 2A formed on the thermoplastic synthetic resin layer 2 is brought into contact with the copy surface @4. Then, a light beam containing infrared rays is irradiated from the support body 1 side using the xenon discharge tube 5. The irradiated light beam is applied to the image portion 4 of the copy document 4.
The heat energy is absorbed by the area a and generates heat, and is diffusely reflected in areas other than the image area 4a, and as a result, the heat energy is transmitted to the satin surface 6 above the image area 4a. At this time, this portion 6 is melted by the thermal energy of the image portion 4a and becomes a smooth surface.

In this way, the original film 3 has an image area 4 by smoothing the satin surface 2A in the area corresponding to the image area 4a.
It becomes possible to transmit light only through the portion corresponding to a. Therefore, a negative type drawing film 3 can be obtained for the copy original 4.

The next method is to form an image using a solvent pen, as shown in FIG.

First, the solvent pen 7 to be used contains a solvent capable of dissolving the thermoplastic synthetic resin layer 2 for image formation and formation, such as methyl ethyl ketone, acetone, etc. 7, the thermoplastic synthetic resin in the calligraphed portion 6 is melted and becomes a smooth surface, which allows light to pass through. Therefore, OH
An original film for P projection can be obtained.

Hereinafter, specific examples of the present invention will be described.

Example 1 Ethylene vinyl acetate copolymer resin (trade name, Everflex #260, manufactured by Mitsui Polychemical Co., Ltd.) was placed on a support made of polyethylene terephthalate resin (trade name, Lumirror 100μ, manufactured by Toshiku Co., Ltd.). It is applied by extrusion coating, and while the resin is melted and softened, it is rolled and cooled using a satin finish roller (matte depth 20 μm) to give the surface a matte finish (matte finish similar to frosted glass).

The two-layer film was laminated, the former having a thickness of 100 μm and the latter having a thickness of 30 μm.

The resulting two-layer film was made into a 250 m2 fragment film, and the ethylene vinyl acetate copolymer side and the offset printing original image area were combined with a flash irradiation device (trade name, Risorcho U-265 Riso Kagaku) from the original side. Industry (
When exposed to a flash of high-intensity light, the satin surface corresponding to the original image area melted and became smooth, and the area corresponding to the original image area became translucent. When the two-layer film was projected using an over-the-top RAD projector, a clear projected image with extremely strong contrast was obtained.

Example 2 When the two-layer film obtained in Example 1 was drawn with a solvent pen impregnated with methyl ethyl ketone, an image of a desired pattern was drawn on the matte surface of the original film. Now has optical properties. That is, an original film was obtained in which only the calligraphy and drawing portions were translucent. When this was projected using an over-the-top RAD projector, a clear projected image with extremely strong contrast was obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of the 0t-IP projection film according to the present invention, and FIGS. 2 and 3 are cross-sectional views for explaining the image forming method according to the present invention. 1...Support 2...Thermoplastic synthetic resin layer 3...Original drawing film 4...Copy manuscript 5...Xenon discharge tube 6...Smooth surface 7...Solvent pen

Claims (4)

[Claims] (1) An OHP projection film comprising a thermoplastic resin layer having a satin finish on the surface and having a Vicat softening point of 100° C. or less, laminated on a support made of a transparent synthetic resin film. (2) For light obtained through a Fresnel lens, etc., which has a matte finish on the surface and a thermoplastic resin layer with a Vicat softening point of 100°C or lower, which is laminated on a support made of a transparent synthetic resin film. By selectively melting a part of the satin-finished surface of the non-light-transmitting film in correspondence with the original image and making it a smooth surface, only the part corresponding to the original image part passes through. A method for forming an image on an OHP projection film, characterized in that: (3) By bringing the original image into close contact with the satin finished surface of the film and irradiating it with light to melt and smooth the area corresponding to the original image area, only the area corresponding to the original image area is transmitted. An image forming method according to claim 2, characterized in that: (4) Corresponding to the desired original image, draw a calligraphy area on the satin-finished surface of the film using a solvent pen.
3. The image forming method according to claim 2, wherein the image forming method is melted and smoothed so that only a portion corresponding to the image portion of the document transmits light.