JPH11138981A - Transparent image recording medium and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent image recording medium having excellent absorbability of an aqueous soluble color ink and excellent surface smoothness for precisely printing without generating an ink bleeding. SOLUTION: The transparent image recording medium comprises a transparent support layer, and a surface layer formed on its one side surface. The surface layer is formed of thin pulp paper containing a pulp of trunk and stem of a gramineous plant as a main component and high transparency and paper- made without adding a loading material at all. The paper is preferably pulp paper containing a pulp obtained by digesting the trunk and stem of the gramineous plant in an alkali aqueous solution containing a hydrogen peroxide as a main component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transparent image recording medium and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in order to make a large color recording medium used for illuminated display, illuminated advertisement, decoration, overhead projector (OHP), etc., a color image is formed by placing a photosensitive thin film on a conventional film or glass plate. Or printing a color image on a thin film with a printing ink using an organic solvent. However, the ability to produce new transparent image recording films simply and without the use of organic solvents would be desirable in areas such as stained glass interior decoration, traffic signage, academic presentations, visual education and the advertising industry. Was rare.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a transparent image recording medium having excellent surface smoothness, which is excellent in absorptivity of a water-soluble color ink and capable of performing precise printing without causing ink bleeding. It is an object to provide a manufacturing method thereof.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, a transparent support layer and a surface layer formed on one surface of the transparent support layer, and the surface layer is mainly composed of pulp of a stem of a gramineous plant, and does not include any filler. And a transparent image recording medium comprising a thin pulp paper having a high transparency. Also,
According to the present invention, the pulp paper has a basis weight of 5 to 40 g / c.
^2. The transparent image recording medium according to claim 1, which has a m ² .
Further, according to the present invention, the pulp paper is a pulp paper mainly composed of pulp obtained by digesting a stem of a grass plant in an alkaline aqueous solution containing hydrogen peroxide. Is provided. According to the present invention, the pulp paper is thickened from the stem of sugar cane (lined).
A pulp paper containing pulp obtained by digesting pulp in an aqueous alkali solution containing hydrogen peroxide.
Is provided. According to the invention, the transparent support is a plastic film.
To 4 are provided. According to the invention, the transparent support is glass.
To 4 are provided. According to the present invention, there is provided a method for producing a pulp paper having a smoothness of 500 seconds or more on a surface constituting one surface of a transparent image recording medium using pulp mainly composed of pulp of a stem of a grass plant. The wet part is formed by the wire part of the above, compressed to remove water contained therein, dried on a drying drum, and if necessary, the surface is smoothed. A method for manufacturing a transparent image recording medium is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram illustrating the configuration of a transparent image recording medium according to the present invention. In FIG. 1, reference numeral 1 denotes a pulp paper mainly composed of pulp of a stem of a gramineous plant. on the other hand,
The support 2 is a transparent sheet supporting the surface area 1 and is a glass plate or various polymer films. As the polymer film, a plastic film such as a polyester film, a polyamide film, a polycarbonate film, a polyethylene film, and a polypropylene film, an acetylcellulose film, a cellophane paper, a celluloid film, and the like can be used. In order to obtain a pulp paper constituting the surface layer, a stalk of a gramineous plant is used as a raw material, and this is pulped. Leaves contained in straw, such as rice straw and wheat straw, impair the drainage and strength of pulp and paper. Therefore, it is desirable to separate and remove the leaves by various methods prior to pulping. 2 straws
Cutting to 15 cm, preferably 4 to 10 cm, and wind-selecting is one of the simple and effective methods for separating and removing leaves.

[0006] The sugarcane line is a bagasse (residue) obtained by crushing the stem of sugarcane and compressing to separate the juice.
Can be obtained by removing pis (internodal parenchymal cell tissue), or by mechanically removing sugar cane by vertically dividing the juice and the pis or wax attached to the epidermis. Similarly, a line of similar plants such as sweet sorghum and corn can be collected from the stem of the original plant. In this case, pis may remain in the obtained lined, but it impairs the drainage and strength of pulp and paper. Therefore, the amount of the pis mixed is 10% by weight or less, preferably on a dry basis, preferably, It is good to make it 3% or less. In the present invention, a sugarcane line mixed with 0.5 to 10% of pis can be advantageously used as a pulp raw material. As the pulping method of the lined, various conventional chemical pulping methods using an alkaline cooking liquid such as a soda method, a kraft method, an alkaline sodium sulfite method, and a PA method (hydrogen peroxide-alkali method) can be used. The use of the PA method is particularly preferred. This PA
The method uses hydrogen peroxide and alkali (NaO
H, Na ₂ CO ₃ , NaHCO ₃ , KOH, K ₂ CO ₃ , K
This method uses an alkaline aqueous solution containing HCO ₃ or the like. According to this PA method, unbleached pulp having high whiteness, low lignin content, high pentosan content and good beating properties can be obtained. The bleached pulp obtained by this PA method has excellent strength, high density and high transparency, and gives paper having good surface smoothness. If necessary, the stem pulp of the gramineous plant obtained as described above may be used alone or in combination of several or more, followed by viscous beating. The standard in this case is C.I. S. F. It is 90-500 ml, preferably 150-350 ml. A complete stock is prepared by adding stock components to the beaten pulp. Pulp of plants other than Gramineae can be blended, and the proportion of pulp of Gramineae plants in the total pulp is 60% or more, preferably 80 to 100%, based on the absolute dry weight.

When pulp paper is obtained as described above, the pulp paper has a thickness of 5 to 40 g / cm ² , preferably 1 to 40 g / cm ² .
The thickness is adjusted to give a basis weight of 0 to 30 g / cm ² . The thickness of the pulp paper can be adjusted according to the concentration and amount of the complete stock supplied to the paper machine and the papermaking speed. On the other hand, the surface smoothness of the pulp paper is controlled by the pentosan content of the raw pulp, the structure of the single fiber, especially the thickness and shape of the pores in the longitudinal direction at the center of the fiber, and the degree of beating when preparing the complete stock. Is possible. The surface smoothness of the pulp paper can also be adjusted by the smoothness of the drying drum used when drying the wet pulp paper obtained during the beating process and papermaking. In addition, pulp paper having a higher degree of surface smoothness can be obtained by surface-treating dried paper obtained from a paper machine. In this case, the surface smoothing treatment can be performed to increase the bubble smoothness to 1,000 seconds or more by using a calendar such as a plate calendar, a super calendar, and a sheet calendar.

The density of pulp paper is usually 0.75 g / cm ³
As described above, it is preferably 0.85 to 1.05 g / cm ³ .
The surface smoothness referred to in the present specification is JIS P81
19-1976 means the surface smoothness of Beck (expressed in seconds). Pulp of a plant of the family Poaceae by the PA method used in the present invention, particularly lined pulp, has a short fiber length, a large bore, and an extremely large pentosan content, so that it can be easily viscous beaten and has a high density. It has high transparency and is easy to give pulp paper having a particularly smooth surface. Further, according to the inventor's research, the lined pulp does not add any filler to give highly transparent pulp paper. Also, by proceeding viscous beating, almost sizing,
Alternatively, it was confirmed that the pulp paper obtained without any application exhibited water absorbing properties, and exhibited a property that hardly caused ink bleeding while absorbing water-soluble color ink.
The sizing in this case includes surface sizing and internal sizing, and can be performed by a conventionally known method. For the surface sizing, glue, starch, carboxymethylcellulose (CM
C), a sizing agent such as polyvinyl alcohol, alkyl ketene dimer or the like is applied and dried. On the other hand, inner sizing is alkyl ketene dimer,
It is carried out by adding a sizing agent such as rosin, alkylstyrene polymer, wax and the like to the stock. On the other hand, the inner surface sizing is performed by adding a sizing agent such as an alkyl ketene dimer, a rosin, an alkylstyrene polymer, or a wax to the stock. In the case of surface sizing, the amount of the sizing agent used is 0.5 to the pulp.
% By weight, preferably 0 to 0.2% by weight. In the case of internal sizing, the amount of the sizing agent used is 1.0% by weight or less, preferably 0 to 0.5% by weight, based on pulp.

In the pulp method comprising as a main component the thus-obtained Poaceae of the Poaceae family, Minoru Yoshitoshi Yoshihashi Hashihashi, this is adhered to a transparent support to form a transparent image recording film. The bonding method in this case includes a method using an adhesive and a heat fusion method. The adhesive includes a solution adhesive, an emulsion adhesive, a film adhesive, a hot melt adhesive, and the like. The type of support in the bonding method using this adhesive is colorless and transparent cellophane, plastic film,
And various types such as a glass plate. On the other hand, in the case of the heat fusion method, the support is made of a heat-fusible polymer at least on its surface, for example, a plastic film, and pulp paper is laminated on the film, and heated and heated. The two can be adhered by pressing.

The transparent image recording medium of the present invention can be used for the output of electronic equipment such as a color copying machine such as an illuminated display, an illuminated advertisement, a color overhead projector (OHP), a color fax machine, a digital camera, and a personal computer by a color inkjet printer. It is advantageously used as a material for

[0011]

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. The percentages described below are percentages by weight.

Example 1 A transparent image recording medium comprising pulp paper as an upper layer and a plastic film as a support was produced. That is, the preparation of pulp paper is performed using a sugar cane bleached PAP (PA pulp) 100 kg and rice straw bleached PA
5 kg of P and 5 kg of bleached corn husk PAP were placed in a beater, and water was added to adjust the raw material concentration to 3.5%.
S. F. Beat it to 390 ml, dilute the water after the beating without adding any sizing agent or filler, and dilute the water until the raw material concentration becomes 0.25%. Dewatered with a press part to a raw material concentration of 51%, brought into close contact with the surface of a mirror-finished smooth Yankee dryer, dried, and weighed 30 g / m ² , density 0.8
A pulp paper with a surface smoothness of 8 g / m ² for 630 seconds was obtained.

Next, the pulp paper is overlaid on a polyethylene terephthalate (PET) film having a thickness of 0.10 mm, and pressed at the softening temperature of the PET film to obtain a laminate of the PET film and the pulp paper. Was. When a color image was recorded on the pulp paper surface of the laminate using a water-soluble color ink via a jet printer, a clear transparent color image film for OHP was obtained.

EXAMPLE 2 150 kg of bleached PAP of caneed was placed in a beater, and water was added to a raw material concentration of 4.0%. S. F. 1
Viscous beating was performed until the volume reached 90 ml. After the beating, no sizing agent or filler was added at all, and water was diluted until the raw material concentration reached 0.20%, and thin paper for pulp paper was obtained using a round paper machine.
This thin paper is put on a super calendar and weighs 18 g / c.
A pulp paper having a surface smoothness of 1600 seconds and m ² of 0.98 g / cm ³ was obtained. A hot-melt film was sandwiched between the pulp paper and the glass plate and pressure-bonded at a softening temperature to obtain a transparent color image recording medium for illumination with good resolution. When a color image was recorded on this transparent color image recording medium using an ink jet printer using a water-soluble color ink, a clear transparent color image with good resolution was obtained.

[0015]

The transparent image recording medium of the present invention has high transparency on a colorless and highly transparent plastic film, cellophane, glass plate or the like, and has a smooth surface layer, and has good moisture absorption and drying properties. A composite with pulp paper adhered to it can easily create figures with high color reproducibility and high resolution by hand-painting and printing with water-soluble color ink and inkjet of the output of various electronic devices. Thus, it is suitable as a transparent image recording medium for an OHP, an illuminated display panel, an interior decoration, and an illuminated advertisement.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional configuration view of a transparent image recording film of the present invention.

[Explanation of symbols]

 1 surface layer 2 support layer

Claims (7)

[Claims] 1. A transparent support layer and a surface layer formed on one surface of the transparent support layer, wherein the surface layer is mainly composed of pulp of a stem of a gramineous plant, and is prepared without adding any filler. A transparent image recording medium comprising a thin and highly transparent pulp paper. 2. The pulp paper having a basis weight of 5 to 40 g / cm ^2.
The transparent image recording medium according to claim 1, wherein 3. The transparent image according to claim 1, wherein the pulp paper is a pulp paper mainly composed of pulp obtained by digesting a stem of a grass plant in an alkaline aqueous solution containing hydrogen peroxide. recoding media. 4. The pulp paper according to claim 1, wherein the pulp paper is a pulp paper obtained by digesting a thick bark of a sugar cane stem in an alkaline aqueous solution containing hydrogen peroxide. 2. A transparent image recording medium. 5. The transparent image recording medium according to claim 1, wherein said transparent support is a plastic film. 6. The transparent image recording medium according to claim 1, wherein said transparent support is glass. 7. A method for producing a pulp paper having a smoothness of 500 seconds or more on a surface constituting one surface of a transparent image recording medium using pulp mainly composed of pulp of stems of grasses. The transparent paper according to any one of claims 1 to 6, wherein the wet part is formed by a wire part, compressed to remove moisture contained therein, and then dried on a drying drum and, if necessary, subjected to a surface smoothing treatment. A method for manufacturing an image recording medium.