JPH0773949B2 - Information recording method and information recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording device such as a facsimile, a printer, a plotter, and a copying machine, and more particularly to an information recording device using a recording paper having extremely good smoothness.

[0002]

2. Description of the Related Art Conventional recording sheets for various information recording equipment such as electrostatic recording paper, thermal recording paper, thermal transfer paper, etc., have many minute thickness unevenness and density unevenness, so a high density recording head is used. Was.

[0003]

However, no matter how high the density of the head, dropout or uneven recording may occur.
There was a problem that it was difficult to obtain high quality characters and images.

The present invention provides a recording sheet in which high quality characters and images can be obtained with almost no dropout or recording unevenness in an information recording apparatus without special handling mechanically. Aims to provide an information recording device capable of obtaining high quality characters and images by using this recording sheet.

[0005]

In order to achieve the above object, the present invention provides a base paper having a heat-sensitive or transfer recording surface,
A recording sheet with the back surface of the base paper smoothed and coated is sandwiched between the plane of a rigid body with gas through holes and the plane of a mirror-finished gas-shielding rigid body, and a load is applied to these parallel planes. While the sample is being pressed, the air passage time of the gas through hole is measured, and the recording sheet having a recording surface with the air passage time of a predetermined value or more is pressed by the platen to record on the recording surface. This is an information recording method.

A recording sheet having a heat-sensitive or transfer recording surface on the surface of the base paper and a smooth coating on the back surface of the base paper is a rigid flat surface having gas through holes and a mirror-finished gas shield. It is sandwiched between the planes of the elastic rigid body, the air passage time of the gas through hole is measured with the load applied to the pair of parallel planes and the sample is pressed, and the air passage time is recorded as a predetermined value or more. An information recording apparatus, wherein a recording sheet having a surface is pressed by a platen to record on the recording surface.

[0007]

Function: The air passage time of the gas through hole is measured, and the recording sheet having the recording surface having the air passage time of a predetermined value or more is used. It is possible to perform printing without uneven recording.

[0008]

EXAMPLES Examples of the present invention will be described below.
First, the outline of the GS smoothness will be described.

A conventional smoothness measuring method (JIS P8119)
In Beck's smoothness measurement method), the sample was pressed between the glass plate and the rubber sheet, and the smoothness was expressed by the time that a certain amount of air passed through the slight gap between the glass surface and the sample surface. The inventors improved this, and pinched a sample only with a glass plate (glass sandwich = G.S.), and similarly expressed smoothness by air passage time. (Details will be described later.) Therefore, in the conventional Beck's smoothness, only one side of the sheet was evaluated.
It is intended to evaluate the overall uniformity of the sample, including the two-sided state, such as thickness unevenness and density unevenness.

For example, in a natural state, the surface is close to a mirror surface,
The Beck's smoothness of the sample surface with a rough back surface (unevenness of several tens of μm) is several thousand seconds because the rubber sheet complements the unevenness of the back surface. On the contrary, the GS smoothness is less than 100 seconds because the back surface is not complemented.

Such a difference in smoothness corresponds well to the recording state of recent high-density image recording. In other words, in recording equipment, the platen surface is becoming harder due to downsizing and higher accuracy, and with conventional recording sheets that have only high Beck smoothness, there are many dropouts and uneven recording, and high-quality characters and The image is no longer available.

The present invention will be described in detail by making various recording sheets on a trial basis using the GS smoothness described above as a criterion, and describing the correspondence with image quality.

The method and effect when a rigid recording head such as thermal recording, thermal transfer recording or electrostatic recording is used as the recording method will be described.

(Example 1) A thermosensitive coloring material was applied to a base paper to make a trial recording sheet, and an image was recorded by using a line type thermal head of 6 dots / mm and a platen roll of JIS rubber hardness 80. .

First, as the base paper, high-quality paper (made by Tojo Paper Co., Ltd., Kino, basis weight 66 g / m ² ) is prepared. The GS smoothness is about 30 seconds and the Beck smoothness is about 70 seconds. On top of this,
Bisphenol A 68, crystal violet lactone 2, polyvinyl alcohol 3 by solid content weight ratio
A fine particle-dispersed thermosensitive coloring layer of 0 was coated and dried to a thickness of about 5 μm. The Beck's smoothness is about 100 seconds, and if recorded as it is, about 40% of dropout occurs and only an image quality that is not practical is obtained.

The surface of this recording sheet was smoothed with a super calender roll, and several kinds having a maximum Bekk smoothness of about 10,000 seconds were prepared and recorded in the same manner. As a result, when the Beck's smoothness was up to about 1,000 seconds, the dropout gradually decreased to 6%, but even when the smoothness reached 10,000 seconds, about 2% of the dropout occurred. That is, the unevenness remains on the back surface due to the uneven density of the base paper.

On the other hand, on the back surface of these recording sheets, a fine clay having an average particle diameter of 0.1 μm was used as a binder and approximately 20% of
Polyvinyl alcohol dispersion (35% solids)
Was applied several times to several g / m ² in dry weight to smooth the back surface and enhance GS smoothness, and recorded in the same manner. As a result, even if the Beck's smoothness is about 600 seconds, the GS smoothness is about 30.
Dropout dropped below 2% at 0 seconds.

Therefore, when the relationship between the GS smoothness and the dropout of the prepared recording sheets of several points is arranged, the dropout is remarkably reduced from about 300 seconds, and the smoothness is reduced to about 1,000 seconds. Almost no dropout was observed, and a high quality image was obtained.

(Example 2) For thermal transfer recording, the coated surface of wax type thermal transfer paper (made by Fuji Kagaku Paper, capacitor paper type) was overlaid so that it was in contact with a separately prepared image receiving paper as a recording sheet having a thickness of about 60 μm. Together, these are inserted between the head and the platen and recorded as in the first embodiment. Here, when various image-receiving papers were used with a coloring material adsorbent such as clay, or when the GS smoothness was adjusted in accordance with the results of Example 1, dropout occurred when the GS smoothness was adjusted to about 300 seconds. Was significantly reduced, and when the image was smoothed for about 1000 seconds, a perfect image was obtained. However,
Even if only Beck's smoothness was increased to about 10,000 seconds, dropout of several% occurred.

On the other hand, for sublimation type transfer recording, a thickness of 6 μm
4- (4-N, N-dibenzylaminophenyl) -pyridine (manufactured by Hodogaya Chemical Industry Co., Ltd.), which is a leuco dye having a yellow color in solid content weight ratio on one surface of a polyimide film of m 1
A transfer sheet is prepared by coating about 0.5 g / m ² as a sublimable dye layer consisting of 00 parts and 30 parts of polysulfone as a binder. Further, the image receiving paper as a recording sheet contains about 10 g / m ² of activated clay (proton donor material).
Clay paper (Fuji Photo Film, Fujiclay paper 40 g / m ² ) coated on high-quality paper is prepared. Recording is performed in the same manner as in Example 1 by overlapping the coated surfaces of both of them.

Since the GS smoothness of the clay paper as it is is about 80 seconds, the clay surface is treated with a super calender and the back surface is treated in the same manner as in Example 1 to obtain the GS smoothness of up to about 300 seconds. When I raised it, I got an image with few dropouts. An image that appeared to be nearly perfect was obtained with a GS smoothness of about 1000 seconds. Also in this sublimation type example, a high quality image could not be obtained only by increasing the Beck smoothness.

As can be seen from Examples 1 and 2 above, G
The usefulness of the recording sheet having an increased S smoothness is remarkable.

In addition to this, when the hardness of the platen was variously changed and the same effect was examined, a comparatively good image can be obtained even in the conventional recording sheet having a high Beck smoothness in the range of hardness up to 60th. It was However, when the recording sheet of the present invention is used, a high-quality image can be obtained as a platen from a rubber material having a hardness of about 30 to a hard material such as aluminum or brass.

As the recording sheet, only the examples using paper as a base material are mentioned, but the gist of the present invention includes a wide range of materials other than paper, such as plastic and cellulose, regardless of the material.
This limits the appropriate range of GS smoothness.

Further, examples of the coloring material are not limited to the examples, but those which change color or develop color by an electric signal of the recording head, and when a thermal head is used, a usual sublimation dye, It can also be applied to those showing thermochromy.

As described above, the excellent recording sheet can be provided due to the effect of the present invention which succeeds in enhancing the uniformity of the sheet which has been overlooked in the past, and this uniformity has not been known in the past. It can be adjusted based on the new concept of GS smoothness.

Next, a method of measuring the GS smoothness will be described with reference to the drawings. In FIG. 1, 1 is a sample, 2 is a plane of a rigid body having a gas through hole 3, 4 is a plane of a gas-shielding rigid body, arrow A represents the main intrusion direction and location of gas, and B
Indicates the discharge direction and location of the gas. This arrow B is an example of the negative pressure of the through hole, and the pressure may be reversed. A glass surface with an outer diameter of 37.5 mm, which has a circular hole with a diameter of 11.4 mm as a gas through hole, is a rigid flat surface, paper is placed on it, and the surface of a mirror-finished stainless steel plate with a diameter of 37.5 mm is gas. It was used as a rigid rigid plane. 1 on this pair of parallel planes
While pressing the sample with a load of 0 kg / cm ² , the gas through hole was depressurized to 300 mmHg and the air passage time of 10 ml was measured. The measurement results are shown in FIGS. 2 and 3 together with the conventional Beck method. The parameter in the figure represents the uniformity of the sample, and is the smoothness of this method divided by the conventional Beck value.

Firstly, FIG. 2 is about 20 kinds of data uncoated paper, describing representative examples, 11 glassine paper 30 to 40 g / m ^2, 12 is 75 g / m ² of release coated paper base paper, Thirteen
Is a base paper for wax paper of 36 g / m ² , 14 is a printing paper of 64 g / m ² , and 15 is a base paper of fruit tree bag of 37 g / m ² .

FIG. 3 shows data of about 20 kinds of coated paper.
To explain a typical example, 21 is a synthetic paper with a thickness of about 50 μm, 2
2 is 72 to 75 g / m ² fine coated paper, 23 is 1
Highly smooth clay paper of 60 g / m ² , 24 is the back side of color photographic paper, and 25 is white board of 290 g / m ² .

As can be seen from FIGS. 2 and 3, there is almost no correlation between the value obtained by this method and the Beck value, and it can be seen that the sheet used between rigid bodies cannot be evaluated by the Beck smoothness. Further, the higher the uniformity evaluated using this method is, the less uneven the sheet is, and the synthetic paper indicated by 21 in FIG. 3 is a very uniform sheet material. On the contrary, the 2 glassine paper 11 shown in the figure is uniform in density due to the calendering, but the uniformity is reduced to 0.04 because the original paper making unevenness is the thickness unevenness. There is no meaning when used between rigid bodies.

When these 40 kinds of samples were used as packing materials, a proportional relationship was established between the measured value of this method and the packing function.

On the other hand, a thermosensitive coloring layer having a composition of bisphenol A 68, crystal violet lactone 2 and polyvinyl alcohol 30 was applied to these samples in a fixed weight ratio of about 5 μm to prepare a thermosensitive paper. When this thermal paper was wound around a smooth aluminum drum and recorded with a line type thermal head, the higher the smoothness of this method, the better the image without unevenness was obtained.

[0033]

As described above, according to the present invention, the recording sheet is sandwiched between the plane of the rigid body having the gas through holes and the plane of the mirror-finished gas-shielding rigid body to form a pair of parallel planes. While pressing the sample while applying a load, the air passage time of the gas through hole is measured, and the recording sheet having the recording surface having the air passage time of a predetermined value or more is pressed by the platen for recording. It is possible to provide an information recording method and an information recording device that can obtain a high-quality image without dropouts and unevenness that could not be obtained even by the conventional Beck smoothing method.

As the platen, it is possible to use a conventional platen having a relatively low hardness and a platen having a relatively low hardness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an apparatus for explaining a method for measuring GS smoothness used in the present invention.

FIG. 2 is a diagram showing the smoothness of uncoated paper.

FIG. 3 is a diagram showing the smoothness of various coated papers.

[Explanation of symbols]

 1 Sample 2 Rigid Body Plane 3 Gas Through Hole 4 Gas Shielding Rigid Body Plane

Claims (2)

[Claims] 1. A recording sheet in which the surface of a base paper is a heat-sensitive or transfer recording surface, and the back surface of the base paper is smoothed and coated,
It is sandwiched between the plane of a rigid body having a gas through hole and the plane of a mirror-finished gas-shielding rigid body, and the load is applied to a pair of these parallel planes to measure the sample while the sample is being pressed. An information recording method comprising recording a recording sheet having an air passage time of 300 seconds or more by pressing it with a platen on the recording surface. 2. A recording sheet in which the surface of the base paper is a heat-sensitive or transfer recording surface, and the back surface of the base paper is smoothed and coated.
It is sandwiched between the plane of a rigid body having a gas through hole and the plane of a mirror-finished gas-shielding rigid body, and the load is applied to a pair of these parallel planes to measure the sample while the sample is being pressed. An information recording apparatus, wherein a recording sheet having an air passage time of 300 seconds or more is pressed by a platen to record on the recording surface.