JPS62124977A - Preparation of ohp transparency sheet - Google Patents

Abstract

PURPOSE:To obtain an OHP transparency sheet having a high degree of transparency, by recording a matted film and then adhering a transparent adhesive film thereto. CONSTITUTION:A recording sheet having a surface smoothness of not more than 1,000sec and a surface roughness of not less than 3mum and having a surface matted to have a light transmittance of not less than 70% and a haze of not more than 90% is recorded (f) by a dot impact printer. A pressure-sensitive adhesive layer (d) of a transparent adhesive film B for lamination is laminated on a mat layer (a) of the recording sheet A. Rugged parts of the surface of the mat layer (a) of the recording sheet A are levelingly covered by the adhesive layer (d) of the adhesive film B, whereby an OHP transparency sheet having a light transmittance of not less than 80% and a haze of not more than 40% can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for producing a transparency (transparent) sheet for an overhead projector (○HP) so that a recording method using a dot impact printer can be applied. It is.

The dot impact printing method is a recording method with high performance and reliability for use in personal computers, word processors, calculators, PO, S, ECR terminals, and terminals in the information and communications field. Above all, dot impact serial printers currently account for the majority of all printers, have excellent cost performance, are the most versatile, and are widely used. Recently, dot-impact color printers that create color hard copies have become popular in the fields of computer color graphics and CAD systems, and color printers using other non-impact recording methods (inkjet, thermal transfer, dye-sublimation heat-sensitive 2WP printers, etc.) Compared to , it can use plain paper, is maintenance-free, and is highly reliable, making it the mainstream color printer. In addition to OHP transparency sheets for PPC, there has recently been a need for business use and academic societies for so-called oHP transparency sheets, which are used to obtain color hard copies on transparent films and project color images using overhead projectors.

It is becoming stronger in the education world.

The present invention can record with a dot impact printer, especially a color dot impact printer, and can be used as an OHP.
The present invention provides a production method that provides a HP transparency sheet with high transparency that can be used for.

[Problem that the invention seeks to solve]

The basic mechanism of the recording method using a dot impact printer is to use wire pins to transfer and adsorb the ink in the ribbon onto a recording sheet such as plain paper by applying impact pressure in response to an electrical signal to an ink-impregnated ribbon, and print using the dot matrix method. Alternatively, it is used to form an image or the like. Color tod impact printers use wire tod impact serial recording that uses a color ribbon impregnated with yellow, magenta, cyan, black, etc. inks in which dyes or pigments are dissolved or dispersed in a solvent and applied to the width of the ribbon at intervals of four color rings. The method is the main thing.

This recording method has the advantage of being able to use plain paper, but
Not suitable for HP use. That is, paper made of intertwined cellose fibers has sufficient ink receptivity and drying properties.

However, the light transmittance is extremely low due to the structure of the cellulose fiber sheet.

Even paper base sheets with relatively high transparency obtained by heat-treating a mixture of impregnated paper or synthetic fibers do not have the high light transmittance (transparency ) cannot be obtained.

On the other hand, it is impossible to record with a dot impact printer on polyester film, which has the high light transmittance (transparency) required for HP film. In other words, transparent plastic films suitable for OHP transparency sheets, including polyester films, generally have no ink receptivity, do not dry, and have a highly smooth surface, so they are difficult to use when recording with a wire tod serial printer. , scanning of the head causes undried ink to smudge, smudge, etc., and not only do the desired dots not form, but no print is formed at all. Above all, the above-mentioned problems tend to be exacerbated as recording densities and recording speeds are increased to accommodate color hard copy production functions.

Due to the above-mentioned problems, the present invention is based on the fact that there is no ○HP transparency sheet for dot impact printers, and as a result of extensive research, we first developed a surface matte material based on a transparent film that can be recorded on dot impact printers. To invent a method for creating a transparency sheet for OHP that solves the above-mentioned problems by creating a sheet, recording on the sheet with a dot impact printer, and then laminating a transparent adhesive film on the recording surface of the sheet. This is a ground-breaking invention that allows color ○HP transparency sheets to be easily created, and is highly practical considering the high popularity of dot impact printers.

[Means for solving problems]

The invention consists of two elements. That is, the first factor is a sheet that has been subjected to surface matting treatment and is based on a transparent film that can be recorded with a dot impact printer, and the second factor is that a transparent adhesive film is laminated to the matte film after recording with a dot impact printer. The process consists of obtaining a highly transparent OHP)-balance sheet obtained by the process.

More specifically, the method for creating an OHP transparency sheet of the present invention will be explained with reference to the drawings. Figures 1 to 3 are OH
FIG. 1 is a recording sheet, FIG. 2 is a transparent adhesive film for lamination, and FIG. 3 is a TOS transvalence sheet for OHP. FIG.

Recording is performed using a dot impact printer (E) on a recording sheet whose surface has been treated with matte treatment, and this recording sheet (A
) on the matte layer (A), a transparent adhesive film for lamination (B
) and the pressure-sensitive adhesive layer (d) are overlapped and laminated. The pressure-sensitive adhesive layer (d) of the adhesive film.

Light scattering is eliminated by filling in the irregularities on the surface (ie, recording surface) of the matte layer (A) of the recording sheet (A).

Extremely transparent o due to improved light transmittance
Toshitransvalency sheet for HP) is obtained. Note that (b) is a transparent base film.

(c) shows a transparent film.

The surface matte sheet that can be recorded by the dot impact printer of the present invention may be formed using either a chemical matting method or a sand matting method, but it is preferable to use an inorganic or organic pigment from the viewpoint of imparting ink receptivity. It is effective to apply so-called chemical matte processing on one side using.

On the other hand, in the present invention, in order to obtain sufficient transparency for use as an OHP transparency sheet by laminating a transparent adhesive film, it is desirable that the transparency of the recording surface matte film be as high as possible. The chemical matting method is also convenient because the contradictory functions of recording performance and transparency can be adjusted relatively easily.

More specifically, the degree of matting of the surface matted sheet used in the present invention is such that the surface smoothness is 1000 seconds or less, preferably 300 seconds or less, the surface roughness is 3p or more, and the surface roughness is 3p or more, and the surface smoothness is 1000 seconds or less, preferably 300 seconds or less, and the surface roughness is 3p or more. Excellent properties (ink receptivity, drying properties, staining), and light transmittance (λ = 550 nm) of 7.
0% or more, preferably 80% or more, and the haze degree measured by a turbidity meter is 90% or less, and the light transmittance is 80% or more and the haze degree is 40% or less by laminating a transparent adhesive film.
Preferably, a surface matting treatment is performed to make it possible to create a highly transparent HP transparency sheet with a transparency of 15% or less. If the light transmittance is less than 80% or the degree of haze exceeds 40%, the sheet will not be suitable as an oHP sheet, that is, a clear projected image will not be obtained.

For matting, known inorganic and organic pigments are dispersed in a binder resin, and the coating is applied using a conventional coating method (Meyer barcode, roll coating, air knife coating, etc.) and dried to produce a matte finish. Of course, matting that satisfies the above-mentioned surface roughness range may also be performed by sandblasting. If the roughness of the matte surface is less than 3 tones, recording suitability is poor.

Films for lamination include PET, OPP, TAC, and P.
A transparent adhesive film made by coating a transparent film such as VDC or PVC with a pressure-sensitive adhesive.
Although the thickness is not particularly limited, it is preferably about 20/l1In.

When pasting a transparent adhesive film on the recording surface after recording on a surface matte sheet with a dot impact printer, it is necessary to do so so as not to introduce air bubbles, and in some cases it is preferable to press the sheet with a roll. ).

〔Example〕

The present invention will be explained below based on Examples.

Examples 1 to 3 Polyester film (manufactured by Konjinsha, PET75I1m)
), apply the following matting coating liquid (25% solids) using a Meyer bar one-way method, varying the coating amount (Meyer bar #4, #8).
．． #14) Coated and dried surface matte sheet (1)
, (2), and (3) were created.

Composition of matting coating liquid: Binder acrylic polyol (product name: S-7000, manufactured by Soken Chemical Co., Ltd.) 45 parts Incyanate (product name: D-11ON, manufactured by Takeda Pharmaceutical Co., Ltd.) 30 parts Pigment silica (product name: Thyroid) 308. Fuji Davison Co.) 19 parts quartz (product name: Crystallite VX-8. Nisseki Calcium Co.) 6 parts Solvent toluene/ethyl acetate/ethyl Celsolve surfactant SN, American Cyanamid Co.) Mold content 0.3% part Comparative Examples 1 to 3 As comparative examples, the above Examples 1, 2, 3. Titanium oxide (manufactured by Resino Color Industries) was used in the matte coating liquid used for
A surface matte sheet (Comparative Example 1) was prepared in the same manner using Meyer Bar #14 using a coating solution with an increased amount of 8%.

The surface matte sheet (Examples 1, 2, 3, Comparative Example 1), the sand matte film (Diamatsu Door 5, manufactured by Mitsubishi Dia Foil Co., Ltd., Comparative Example 2), and the polyester film itself used in the example (Comparative Example 1) Example 3) was printed using a dot impact color serial printer (color serial printer, trade name: PC-PR201CL, manufactured by NEC Corporation) and evaluated in terms of recording performance, ink receptivity, drying property, and staining.

Furthermore, transparent adhesive film (○PP25
A sheet pasted with M acrylic adhesive 25-) was created and used for overhead projector (product name; G
The quality of the projection map projected using AKKENOHP755W) was evaluated.

The evaluation results are shown in the table below.

Examples 1, 2, 3. The recording properties of Comparative Examples 1 and 2 using the dot impact color serial printer were good. However, Comparative Examples 1 and 2 had poor OHP suitability. Example 1 using a matting sheet specified in the above inland water invention
, 2 and 3 were excellent OHP transparency sheets with good transparency.

Below are margin table measuring instruments: Asahi Seiko [Agriculture, Oken type air permeability and smoothness tester manufactured by Koita Research Institute ■, 5E-3C type universal surface shape measuring machine manufactured by Hitachi ■, grating distribution light/photometer 330 B Honden Manufactured by Shiki Kogyo ■, turbidity meter ND-H67 model NE (Jll
l, Color Syria) L/Printer PC-PR201
Manufactured by CL Gakken, G A K K E N OHP
-755N

[Brief explanation of drawings]

FIG. 1 shows a recording sheet, FIG. 2 shows a transparent film for lamination, and FIG. 3 shows a cross-sectional view of a toshitransparency sheet for OHP. In the figure, A: Matte layer. B: Transparent base film. C: Transparent film. 2: Pressure sensitive adhesive layer. H: Records. A: Record sheet. B: Transparent adhesive film for lamination. C: ○Transvalency sheet for HP @ Figure 1 Figure 2 Figure 3 Procedure amendment document January 31, 1986

Claims (1)

[Claims] 1. Surface roughness of 3 μm on one side of transparent plastic film
Recording is performed by the dot impact method on the matte surface of the sheet that has been subjected to the above surface matting treatment, and then a transparent adhesive film is laminated to the recording surface via an adhesive layer, thereby achieving a light transmittance of 80%. % or more and a haze degree of 40% or less. 2 The smoothness of the matte surface of the transparent plastic film is 1
000 seconds or less OHP according to claim 1
How to create a transparency sheet for 3. The method for producing an OHP transparency sheet according to claim 1 or 2, wherein the transparent plastic film after matte treatment has a light transmittance of 70% or more and a haze degree of 90% or less.