JPH0526969Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to improvements in recording paper wound into a roll of heat-sensitive stencil paper.

(Prior art) (Problems to be solved by the invention) If the end point of a roll of recording paper such as thermal stencil paper is not known in advance, unexpected trouble may occur when replacing the recording paper. It is desired to prepare new recording paper with sufficient time before the paper runs out and to be able to reload without delay.

As a countermeasure, a band-shaped solid mark made of carbon black or the like is placed along the longitudinal direction of the roll of recording paper at a certain length at the inner end, and an optical sensor detects this part and winds the roll. The end of the recording was known by an alarm means linked to the detection means, and the recording paper was replaced. Specifically, the end of the recording paper was recognized by detecting the high-density portion of the end mark by an optical sensor set on the moving roll of the recording paper. The problem with this method is that if the density of the end mark part is low, the optical sensor must be adjusted so that it can be detected at a correspondingly low density. The shading of the background caused by unevenness is detected as an end mark,
This was causing malfunction. In addition, the color density of the end mark part is set to 0.8 to 1.0 using Macbeth reflection density.
If it is increased to a certain level, the difference between the shading caused by uneven formation and the Macbeth density of the end mark area will become large, making it easy to distinguish between the uneven formation and the end mark area, and preventing the above-mentioned malfunction. If the mark is made to have a high density, for example, when the heat-sensitive stencil paper is used to the end, the mark itself will also be made into a plate at the same time, making it impossible to effectively use the internal end of the recording paper.

If the mark density is high, the color density will vary due to variations in pressure when printing the mark, and this variation may reduce the detection function of the optical sensor. Moreover, since it does not look good to the naked eye, there are problems such as lowering the commercial value.

The present invention has been made to solve the above problems.

(Means for solving the problem) The present invention is to apply a light-absorbing layer made of a water-soluble dye to a certain length of the internal end portion of a heat-sensitive stencil paper that is perforated by an electron discharge flash tube wound into a roll. The present invention relates to a roll of recording paper characterized in that it is formed as a striped end mark in width.

Examples of the structure are shown in FIGS. 1 to 4. That is, the figure is a plan view of the end mark attached to the roll-shaped recording paper of the present invention, and FIG.
The figure shows a case where an end mark 2b with a wobbling striped pattern (wave pattern) is attached to the recording paper 1, FIG. 3 shows a case where an end mark 2c with an arrow feather stripe pattern is attached to the recording paper 1, and FIG. This is a case where an end mark 2d in a horizontal striped pattern is attached.

As shown in each of the above examples, the end mark part is printed as a light absorption layer in a striped manner, and the printed part and the non-printed part alternate at regular intervals, so the end mark part does not absorb light. It is detected as a pulse signal by a sensor (for example, Keyence, Model PW-41, photoelectric switch diffuse reflection type), and because it has a regular shape, it is able to eliminate the effects of shading caused by uneven formation of thermal stencil paper. Can be detected without being affected. Note that a value of 0.4 to 0.5 measured by a Macbeth densitometer is sufficient for the printed portion to be detected as a pulse signal.

Note that ink containing a water-soluble dye is used for this printed portion. In other words, ink containing carbon black absorbs infrared wavelengths from electron discharge flash tubes, and carbon black is difficult to disperse in solvents, so heat is concentrated in areas where it remains agglomerated without being dispersed. However, since that part may end up being printed, it is not used in the present invention.
In this invention, the necessary condition required for the printed part made of water-soluble dye is that it does not absorb wavelengths in the infrared region of the electron discharge flash tube, and therefore, even if its color tone is black, it must not absorb other wavelengths. It may be a chromatic color. Also, in relation to printing technology, it is preferable that the end marks referred to in the present invention have the shapes shown in FIGS. 1, 2, and 3. In other words, when printing a horizontal striped pattern using a rolled printing plate, if the printing plate is formed so that the printing protrusions lie horizontally, there is a risk of wrinkles or cuts occurring when pressure printing is applied to the recording paper. In addition, there is a risk that "bleeding" or "edges" may appear on printed matter. On the other hand, shapes such as diagonal stripes do not cause the above problem.

Furthermore, it will be easily understood that the present invention is not limited to the above-mentioned examples, and that various modified striped patterns may be used as the end mark.

Next, the ink made of water-soluble dye used in the present invention will be described in detail. An example of its formulation is as follows.

The inks used in the present invention typically include water-soluble direct dyes, water-soluble acid dyes, and water-soluble reactive dyes. C as a water-soluble direct dye.
I. Direct black (4, 19, 38, 154, etc.),
C. I. Direct Blue (86, etc.), and water-soluble acid dyes such as CI Acid Dred (35
), CI acid blue (1, 9, 40, etc.),
CI. Acid black (1, 31, etc.), C as a water-soluble reactive dye. I. Reactive bullets (21, 170, etc.), C. I. Reactive Blue (27,
77 etc.).

In addition, water-based ink media include water and various water-soluble organic solvents, such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol,
Alkyl alcohols with 1 to 4 carbon atoms such as sec-butyl alcohol, tert-butyl alcohol, and isobutyl alcohol: Amides such as dimethylformamide and dimethylacetamide: Ketones or ketone alcohols such as acetone and diacetone alcohol: Tetrahydrofuran and dioxane Ethers such as: polyalkylene glycols such as polyethylene glycol and polypropylene glycol: alkylene glycols with 2 to 6 alkylenes such as ethylene glycol, propylene glycol, butylene glycol, 1,2,6-hexanetriol, hexylene glycol, etc. Examples include lower alkyl ethers of polyhydric alcohols such as glycerin, ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, and triethylene glycol monomethyl ether.

<Specific formulation example of ink> Example 1 red ink C.I.Assisted Red 35 Part 2 Diethylene glycol 30 parts Water 48 parts Next, embodiments of the present invention will be described.

Example 1 The colored ink of Example 1 was used on the resin film side of a heat-sensitive stencil printing base paper made by adhering a thermoplastic resin film to porous thin paper, and a predetermined dimension was printed at the start end of the roll using a printing plate made of a rolled rubber letterpress. The end mark (striped pattern in Figure 1) of Macbeth reflection density.
0.4, and the heat-sensitive stencil printing base paper was wound to a predetermined length to create a rolled recording paper of the present invention.

When the roll-shaped recording paper made of the obtained thermal stencil paper was loaded into a commercially available thermal stencil maker and put into practical use, the optical sensor of the stencil maker reliably detected information at the end mark position, and an alarm was displayed, indicating the invention. The end mark was confirmed to be valid. In addition, when we created a printing original plate by stacking a manuscript using heat-sensitive stencil paper in the area where the end mark was applied and discharging it from an electronic discharge flash tube, it was confirmed that the end mark itself was not affected by plate-making characteristics in any way. .

(Effects of the invention) The end mark of the rolled recording paper of the present invention can be reliably detected by an optical sensor, and the printed end mark can also be used as recording paper in the same way as the unprinted part of the end mark. , it is possible to provide recording paper with absolutely no waste.

Moreover, since the mark itself has a pattern structure, the product value can be increased.

[Brief explanation of the drawing]

1 to 4 are plan views of the end mark portion of the recording paper of the present invention. 1...Recording paper, 2a...Diagonal striped end mark, 2b...Wobble striped end mark, 2c
... End mark with arrow feather stripes, 2d... End mark with horizontal stripes.

Claims (1)

[Scope of utility model registration request] A fixed length of the internal end portion of the heat-sensitive stencil paper is perforated using an electronic discharge flash tube wound into a roll.
A roll recording paper characterized in that a light absorption layer made of a water-soluble dye is formed as striped end marks with a constant width.