JPS6034695A - Metal-containing sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in sheets containing metals or metal compounds that can be detected by proximity detectors and can be used to create manuscripts by any means such as copying.

BACKGROUND OF THE INVENTION With the proliferation of office copiers and facsimile machines, it is desirable (and some already exist) to provide practical means to prevent unauthorized copying of confidential documents or copyrighted records. The present inventors also process document sheets by vapor-depositing, coating, impregnating, pasting, etc. with metal, and also adjust the metal in document sheets to match the scanning exposure process during copying. We have proposed a device that is equipped with a means to detect and respond.

As a metal-containing sheet that can be used in this device, for example, aluminum vapor-deposited paper for discharge recording is known. As shown in the cross-sectional view in FIG.
and a white conductive layer 1d. Even if such a metal-containing sheet is passed through an electrophotographic copying machine to obtain a copy, the electric charge will escape due to its low electrical resistance, so transfer cannot be performed, so it can be used as an electrophotographic transfer sheet. did not previously exist.

Purpose of the Invention The present inventor has already filed a patent application for a metal-containing IIE photographic transfer sheet (Japanese Patent Application No. 57-1468).
No. 23), the present invention further improves this, can be detected by a proximity detector, and has sufficient paper passability for an electrophotographic copying machine not only as printing paper but also as a transfer notebook for electrophotography.
The purpose is to provide a sheet that allows you to create manuscripts by any means.

Structure of the Invention When a sheet having the structure described in the earlier application is passed through a copying machine such as a Xerox, if the metal layer and the paper or plastic film that sandwich it are made thicker, the sheet becomes stiffer (too much, and jams occur in the copying machine). In addition, the metal-containing layer had problems such as deterioration and oxidation during long-term storage.Furthermore, to prevent jamming, the metal layer and the paper or plastic film sandwiching it should be made thinner. Then,
The manufacturing process caused wrinkles in the metal layer and the paper or plastic film, making it difficult to obtain a satisfactory three-layer sort.

The present invention solves the above-mentioned problems by using neutral-based paper as the paper between the metal layers.

That is, in the present invention, paper is made in a neutral system and the pH is 6.5 or higher (J
ISP-8133), Homa [, / < l-17,5
By obtaining paper with a test temperature of 9.0 to 9.0, the above-mentioned troubles were solved and the objective was achieved. The paper according to the present invention is compliant with Clark JIS P-81.
43) compared to paper made using conventional acidic systems,
With a decrease of 15%, the flexibility of the paper increases, making it easier for the paper feeding roller of the paper feeding device to apply oil to the paper, resulting in complete contact with the photoreceptor during transfer. Also, by sandwiching the metal layer between neutral paper, problems such as oxidation of the metal layer were eliminated.

Examples of metals or metals in metal compounds that can be detected by the proximity detector that can be used in the present invention include aluminum, iron, copper, zinc, cadmium, silver, and nickel, but aluminum is most preferred from the viewpoint of manufacturing.

Transfer paper LC fillers of the present invention can be used, examples of which include heavy calcium carbonate, light calcium carbonate, talc, clay, titanium dioxide, satin white, and the like.

A proximity detector is a device that can detect any metal in a non-contact state by using the change in impedance of the oscillation coil of a high-frequency oscillation circuit due to the thin current product.The internal structure is well known, so details will be omitted. .

The metal-containing sheet of the present invention will be explained below with reference to Examples and Comparative Examples.

Examples 1 to 3 and Comparative Example 1 Neutral systems (3 types) and acidic systems (1 type) were prepared with the basis weight, valve compounding ratio, types of fillers and sizing agents, and their addition rates as shown in Table 1. Papers for lamination of Examples 1 to 3 and Comparative Example 1 were obtained.

All of these papers have a metal layer 2b as shown in FIG.
was sandwiched between paper sheets 2a and adhered with an adhesive to obtain a metal-containing sheet. When these metal-containing sorts were passed through a Xerox 4800° 2100, paper Table 1 for Examples 1-3 1) LBKP = Hardwood Bleached Kraft Pulp 2) N
BKP = oblique M wood bleached kraft pulp 3) GL = ground calcium carbonate 4) FCC = precipitated calcium carbonate 5) Measured according to JIS P-8133 (PTI test method for paper and paperboard).

The metal-containing sheet obtained from
A paper jam occurred in the metal-containing sheet obtained from the comparative paper.

Effects of the Invention The present invention is a metal-containing notebook consisting of a gold striped layer sandwiched between paper made using a neutral system, which can be detected by a proximity detector, and has sufficient copying machine paper passing characteristics as a transfer sheet for electrophotography.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a discharge recording paper, and FIG. 2 is a sectional view of an example of the sheet of the present invention. Codes in the figure: 1a... Base paper; 1b... Carbon layer; lc... Aluminum vapor deposited layer: 1d... White conductive layer: 28... Neutral paper: 2b (and 3 others) tH1 diagram Figure 2

Claims (1)

[Claims] In a paper with a three-layer structure in which a layer containing a metal or a metal compound that can be detected by a proximity detector is sandwiched between sheets of paper, it is confirmed that the paper is made using a neutral system and has a rating of -6.5 or higher. Characteristic metal-containing sheet.