JPS60253582A - Superposed body - Google Patents

Abstract

PURPOSE:To make it possible to use a material to be recorded in an optimum state at the time of recording or observation by preventing the deterioration of a recording characteristic, by superposing a humidity conditioning material to the material to be recorded so as to cover an ink layer with the humidity conditioning material. CONSTITUTION:A material 1 to be recorded having an ink receiving layer and a humidity conditioning material 2 are provided in such a state that the humidity conditioning material 2 is superposed to the material 1 to be recorded so as to cover the ink receiving layer of the material 1 to be recorded with the humidity conditioning material 2. The humidity conditioning material 2 has function for controlling the humidity in the superposed body in a certain range. That is, under a high humidity condition, the humidity conditioning material preferentially absorbs humidity to reduce the absorption amount of moisture by the ink receiving layer of the material 1 to be recorded or absorbs the moisture of the ink receiving layer to reduce the moisture content thereof and, under a low humidity condition, the humidity conditioning material releases moisture and functions so as to increase the moisture in the ink receiving layer. The superposed body is formed by repeating operation such that the humidity conditioning material is superposed to the material 1 to be recorded at a predetermined position and a separate material 1 to be recorded is further superposed thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the above-mentioned superimposed body containing a recording material suitable for storage, preservation, transportation, etc. of a recording material used in inkjet recording and the like.

[Prior art]

2. Description of the Related Art Conventionally, recording using a recording liquid, that is, ink, has been widely performed using a writing instrument such as a pole pen, a fountain pen, or a felt-tip pen. Also, recently, so-called inkjet (
A recording method has also emerged, and ink is also used here.

Incidentally, this inkjet (recording) method uses various ink ejection methods (for example, an electrostatic suction method, a method that uses a piezoelectric element to apply mechanical vibration or displacement to the ink, and a method that heats the ink to foam it. (methods using pressure, etc.) are known to produce ink droplets.
, and record by attaching some or all of them to a recording material such as paper or resin film.

As described above, when recording using liquid ink, the ink absorbency of the recording material is poor.

Fixation of the ink attached to the recording material is slow, leading to inconveniences such as ink dots smearing and print quality deteriorating, or ink absorption properties peeling off due to external force or being transferred to other areas and causing contamination. Therefore, in recording materials for such uses, it has become common practice to provide an ink-receiving layer (also known as an ink-absorbing layer) with increased affinity for ink on the surface to which ink adheres during recording. There is. Especially for multi-color or full-color recording where a large amount of ink is applied,
For transparent recording materials used when creating original images for overhead projectors (hereinafter referred to as OHP), it is essential to separately provide an ink-receiving layer on a resin film. .

However, such ink-receiving layers, especially ink-receiving layers of translucent recording materials, often have smooth surfaces, and they do not accept water-based inks that are mainly used for inkjet recording. These ink-receiving layers are often made of water-soluble or water-swellable wood-based resins such as polyvinyl alcohol and gelatin to absorb the ink. received,
If the recording materials become soft or sticky and are stacked on top of each other, the recording materials will stick to each other due to the ink-receiving layer. This tends to cause so-called blocking development, which tends to cause problems such as deterioration of the quality of the recording material.

In addition, some of the recording materials mentioned above have plastic films as constituent members, and when such recording materials are stacked on top of each other, plastic films generally tend to be charged with static electricity. Since the exposed surfaces tend to come into close contact with each other, handling is extremely troublesome, and an environment favorable for the blocking development is created.

On the other hand, in the case of an ink-receiving layer made of a hydrophilic resin, the water content of the ink-receiving layer itself is one of the major factors that influences ink absorbability.

It is preferable that the moisture content of the ink-receiving layer is within a suitable range.If the moisture content of the ink-absorbing layer is too high, the ink-absorbing property will often decrease and good recording characteristics cannot be obtained. Furthermore, if the water content of the ink-receiving layer is extremely low, the ink absorbency may even be reduced. The decrease in ink absorption in this case is thought to occur because when the water content in the ink-receiving layer is low, the molecular bonds between the resins forming the layer become stronger, and the entropic degree of freedom in the ink-receiving layer decreases.

In addition, curling may occur due to the difference in expansion/contraction rate due to moisture absorption with the ink-receiving layer base material, causing problems such as making it difficult to observe the recorded image and making it difficult to record, store, and store the recording material. Sometimes it happened.

These problems tend to appear particularly in recording materials with excellent ink absorption properties, since an ink receiving layer with high moisture absorption properties is provided in order to improve the ink absorption properties.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned drawbacks in storage, preservation, transportation, etc. of recording materials, such as blocking when stacked, adhesion due to static electricity, excessive moisture absorption of the ink-receiving layer, and drying. To store, archive, mail, etc. the formed recording material so that it can be used in its best condition when recording or observing the recording material to prevent deterioration of recording characteristics due to overwashing. The objective is to provide a superimposed body of

[Structure of the invention]

The above objects can be achieved by the present invention described below. That is, the superimposed body of the present invention includes a recording material having an ink-receiving layer and a humidity control material, and the recording material is coated with the humidity control material so that at least the ink-receiving layer of the recording material is covered with the humidity control material. It is characterized by being layered with humidity control materials.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a schematic external view showing an embodiment of the superimposed body of the present invention. This superimposed body has a structure in which recording materials 1 and sheet-like porous materials 2 are alternately stacked.

The recording material 1 is recorded with a recording liquid such as ink by a recording method such as inkjet recording, and is used for observing a recorded image using transmitted light or for surface observation. This recording material 1 has a base material and a surface on which recording is performed during recording, that is, an ink receiving layer that absorbs ink.

As the base material, a film or plate made of plastic such as polyester, diacetate, triacetate, acrylic polymer, cellophane, celluloid, polyvinyl chloride, polycarbonate, polyimide, or a glass plate is used.

The I/R receptive layer is a material that can form a continuous film on the base material and has the ability to fix I/R through physical and chemical actions such as dissolution in ink, swelling with ink, and penetration. , for example, one or more of natural or synthetic resins such as starch, caseino, albumin, gum arabic, alginic acid soda, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, carboxymethylcellulose, polyacrylic soda, ionomer resin, polyvinyl acetate, etc., as desired. After dissolving it in a solvent and applying it on the above substrate.

This can be formed by drying or cooling.

Furthermore, if desired, as a filler, mainly to further enhance the ink absorption and fixing properties of the ink receiving layer,
For example, fine silicic acid, clay, talc, diatom ±, calcium carbonate, calcium sulfate, titanium oxide, zinc oxide,
One or more pigments such as satin white, aluminum silicate, lithopone, alumina, and zeolite may be dispersed in the ink-receiving layer.

The recording material of the present invention may be transparent for transmitted light observation, or may not be transparent for surface observation.

The humidity control material 2 has a function of controlling the humidity within the stacked body within a certain range. That is, under high humidity conditions, the moisture control material preferentially absorbs moisture and reduces the amount of moisture absorbed into the ink receiving layer of the recording material l, or absorbs moisture in the ink receiving layer and reduces the moisture content. Under low humidity conditions, the humidity control material works to release moisture and increase the moisture content in the ink-receiving layer. Such humidity control materials include paper with a humidity control function such as polysaccharide paper, paper, cotton cloth, linen cloth, silk cloth, etc., and hygroscopic powder such as silica gel and quicklime mixed with resin in an amount of about 20 to 98% by weight. Examples include those in which a resin containing the powder is molded into a sheet shape, or those in which the powder is placed in an air-permeable sheet-shaped bag.

When you want to control the humidity of the recording material l, use a humidity control material 2 made of highly hygroscopic material such as silica gel molded with resin etc.
If you want to control the recording material 1 at a high humidity, use a humidifying material with a high moisture content, such as polysaccharide paper, in a somewhat humid state. make it possible to do so.

Although FIG. 1 shows an example in which two recording materials 1 and two humidity control materials 2 are used, a desired number of recording materials 1 and humidity control materials 2 can be used.

Further, the size and material of the recording material 1 do not necessarily have to be the same, and the width of the humidity control material 2 should also be determined at least in the area where the ink receiving layer of the recording material 1 overlaps with another recording material 1. It is sufficient that the area is wider than the overlapping portion of the recording materials, and the material does not need to be the same.However, in the case of preventing the recording materials from coming into close contact with each other by charging, it is necessary to be larger than the overlapping portion of the recording materials.

In addition, for handling such as storage and transportation, it is convenient if the recording material and the humidity control material are all the same size.

In the superimposed body of the present invention, the humidity control material 2 is superimposed on a predetermined position on the recording material 1 so that the ink receiving layer of the recording material 1 does not overlap with other recording materials, and further, Another recording material 1
It is formed by repeating the operation of overlapping the layers, and is wrapped and packaged as necessary.

〔Effect of the invention〕

With the superimposed body of the present invention, when recording materials used in inkjet recording methods etc. are stored, stored, transported, etc., the recording materials absorb too much water or become too dry, resulting in deterioration of their recording properties. There was nothing left to do. Also, there is no blocking between recording materials or adhesion due to static electricity. It has become possible to stack recording materials without impairing recording characteristics or image quality.

Furthermore, it has become possible to prevent curling caused by extreme moisture absorption in the ink receiving layer of the recording material.

Due to the various effects described above, it has become possible to use the recording material in its best condition when recording or observing the recording material.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail by giving Examples and Comparative Examples.

Example 1 A PET film with a thickness of 10 (1) tm (product name: Nilmirror Azuma, v) was used as a substrate, and a dry film thickness of IO was used as a substrate.
PVA to become Q (Product name: GOHSENOL KP-
08 (manufactured by Nippon Gosei Kasei Kogyo ■) was applied, an ink-receiving layer was provided, and a recording material was formed. Humidity control paper (manufactured by Mishima Paper Corporation) was used as the humidity control material, and 50 sheets of the recording material and 50 sheets of the humidity control material were alternately stacked to make a total of 100 sheets. A recording property test was conducted on this superimposed body as follows.

After leaving the superimposed body in 20° 085% RH for 24 hours, put it in a zippered plastic bag and seal it, and leave it at 5°C for 24 hours, 6
It was stored for one month with a 24-hour cycle at 0°C. After storage, the recording materials are taken out from the superimposed body, and on-demand inkjet recording is performed using a piezo vibrator to eject the recording liquid for each recording material at room temperature. Using an inkjet recording device with a drive voltage of ?5V and a drive frequency of 2KH2), four color aqueous inks with the compositions shown in Table 1 were used as the recording liquid, and a test was carried out at 6 ter/(black, yellow, red, blue). (each of which was printed solidly in this order within a 2 cm square area arranged horizontally on the recording material).

Table 1 The fixation time was measured by leaving the recording material at room temperature after recording, and measuring the time until the ink did not stick to the finger and the ink dried when the finger touched the recorded image. The recording density was measured using a photographic densitometer (N
L, M-5TD-fr-manufactured by Narumi Shokai), the inkjet recording characteristics were evaluated, and the average value of the characteristic evaluation values of 50 recording materials was calculated.

Example 2 A superimposed body was formed in the same manner as in Example 1, except that mixed paper containing 25 wt% silica gel (manufactured by Mitsubishi Paper Mills) was used as the humidity control material, and a coated material was used. Recording characteristics were tested in the same manner as in Example 1. The results are shown in Table 2.

Comparative Example 1 A recording material was formed in the same manner as in Example 1, and this recording material was
0 sheets were stacked, and the recording characteristics were tested in the same manner as in Example 1. The results are shown in Table 2.

Table 2 As can be seen from Example 1.2 and Comparative Example 1 described above, it was found that the recording characteristics of the recording material did not deteriorate according to the present invention.

[Brief explanation of drawings]

FIG. 1 is a schematic external view of an embodiment of the superimposed body of the present invention. 1: Recording material 2 Humidity control material

Claims (1)

[Claims] 1) A recording material having an ink-receiving layer and a humidity control material are provided, and the humidity control material is superimposed on the recording material so that at least the ink-receiving layer of the recording material is covered with the humidity control material. A superimposed body characterized by: