JPS626994A - Neutral paper - 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 Industrial Application The present invention relates to an electrophotographic transfer paper, and more particularly, to an acid-free paper particularly suitable for electrophotographic transfer machines and printers.

Conventional technology In recent years, in the paper industry, the neutral papermaking technology that has been implemented in the fields of thin paper such as India paper and rice paper, metal mounts, rust-proof paper, electrical insulation paper, and special paper such as photographic paper has been used for printing and writing. There is a growing movement to apply this method to the production of high-quality paper for use in industrial use. This neutral paper is made using an aqueous medium with p■1'1.0 or more, uses a neutral size as a sizing agent, and mainly uses calcium carbonate when adding filler. It is. The main aim of converting high-quality paper to neutral paper is to reduce manufacturing costs by using calcium carbonate, which is a rich resource and is inexpensive, as a filler. The aim is to improve the pollution of water and purify wastewater, among other benefits.

For example, Japanese Patent Application No. 58-64598, No. 58-3662
When using neutral high-quality paper as shown in No. 3 in an electrophotographic copying machine, it not only has poor paper feeding properties, but also
It has been found that there are serious drawbacks in that the photoreceptor is worn out, reducing copy performance and shortening the life of the photoreceptor itself. This phenomenon of photoreceptor wear occurs significantly in cleaning blade type copying machines. Furthermore, considering this phenomenon, there is naturally a concern that the rubber roll, rubber belt 1, cleaning blade, fixing roll, etc. used in the paper feeding device may be worn out. In Europe and the United States, some electrophotographic transfer papers are made from neutral paper, and the same phenomenon as described above is observed with such transfer papers. Currently, most of the high-quality paper and transfer paper for electrophotography are No.
Although these papers are acidic as disclosed in No. 740, no abrasion of the photoreceptor was observed in these papers, and the above-mentioned drawbacks are considered to be problems unique to acid-free paper. Furthermore, acid-free paper, especially paper containing calcium carbonate, tends to have a higher coefficient of friction than acidic paper, and when used in electrophotographic copying machines and printers, there is a problem that double feeds and misfeeds are more likely to occur. . The cause of this is not well understood, but it is thought to be due to differences in the basic slipperiness properties of the fillers.

Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and provides a neutral transfer paper which exhibits less wear on the photoreceptor when used as an electrophotographic transfer paper. Furthermore, the friction coefficient is adjusted to provide neutral paper with good runnability without double feeding or misfeeding.

Means and Action for Solving the Problems The present inventors have discovered that the wear of the photoreceptor occurs when calcium carbonate, which is a filler present in paper powder adhering to the photoreceptor, is rubbed against the surface of the photoreceptor by a cleaning blade or the like. I figured out what to do.

Additionally, since calcium carbonate is harder than the Merck and clay fillers used in acidic high-quality paper and electrophotographic transfer paper, it is easier to wear out the photoreceptor, and calcium carbonate-containing paper has a higher friction coefficient than acidic paper. I found that it was higher,
As a method for simultaneously solving the photoreceptor wear and adjusting the coefficient of friction, the present inventors have discovered that both can be improved simultaneously by incorporating a lubricant such as a wax or a fatty acid metal salt, and have completed the present invention.

That is, the present invention is characterized by containing waxes and/or fatty acid metal salts as lubricants by internal addition or size press coating. Moreover, there is no need to select a filler, and the purpose can be achieved by adding any type of calcium carbonate, clay, talc, etc.

Waxes used in the present invention include animal waxes such as beeswax and serratus wax, vegetable waxes such as carnauba wax, petroleum waxes such as rough-in wax and microcrystalline wax, polyethylene wax,
Other synthetic waxes, such as polyhydric alcohol esters of higher fatty acids, higher ketones, higher amines, higher amides, condensates of higher fatty acids and amines, synthetic waxes (roughin, chlorinated paraffins, etc.), and these include It is used as a powder or an emulsion.These are examples and are not limited to these.

Examples of fatty acid metal salts include zinc stearate and calcium stearate, but are not limited thereto.

Furthermore, materials that are known as lubricants or materials that have been newly recognized as having the effect as lubricants are also included.

As a filler, not only calcium carbonate but also other fillers such as clay and talc can be added as necessary.

As the internally added sizing agent, an alkyl ketene dimer-based sizing agent, an anhydrous alkenylconomonolyric acid-based sizing agent, etc. are used.

! The blending, adjustment, and manufacturing conditions of raw materials are controlled in order to impart properties suitable for electrophotographic copying machines, such as copyability, runnability, and curling properties. Publication No. 55-41385,
(See Japanese Patent Application Laid-open No. 142799/1983).

That is, maintaining appropriate copy image density and eliminating background (
To prevent staining of the transfer paper surface (blank paper area), a conductive agent such as sodium chloride, potassium chloride, styrene-maleic acid copolymer, or quaternary ammonium salt is applied to the surface using the size press of the paper machine to reduce the electrical resistance (JI8) of the surface of the transfer paper. C-2111
10° ~ 101・ρ [Humidity (R, H) 6
5 inches, temperature 20℃). In addition, in order to improve the sharpness of the copy image area, surface irregularities are reduced and the smoothness of the transfer paper (according to JI8P-8 stitches 9) is set to 20 seconds or more.

In addition, if the transfer paper partially absorbs moisture and swells or curls, the contact between the photoreceptor of the copying machine and the transfer paper during transfer will decrease, resulting in a decrease in copy image density and partial omission of copies. To prevent curling, reduce the moisture content of the paper from 4.0 to 6.
Even more preferable suitability for electrophotographic copying machines can be obtained by wrapping the material with moisture-proof wrapping paper to prevent moisture absorption and desorption during storage.

EXAMPLES Next, examples and comparative examples in which the neutral paper of the present invention is applied to electrophotography will be explained.

Examples 1 to 5 and Comparative Examples 1 to 3 Filler formulation, pulp formulation, lubricant formulation as shown in Table 1,
Seven types of transfer paper (
Examples 1 to 5 and Comparative Examples 1 to 2) were prepared. At the same time, regarding the commercially available neutral high-quality paper (Comparative Example 3), the impact on copy quality due to the tsubo 1, thickness, degree of photoreceptor wear for cleaning blade type copiers, occurrence of black streaks, white spots, etc. We also evaluated the running performance of the copy machine.

Notes in this table are as follows.

LBKP: Hardwood bleached kraft pulp.

121 NBKP: Softwood bleached craft valve.

(No photoreceptor components were detected in the 3108 paper powder.

X: Photoreceptor components are detected in paper powder.

+4) O: Good.

Δ: Some black streaks are observed.

×: Black streaks and white spots are noticeable.

151 The original oscillation coefficient is according to A8TMD-1894,
Measurement was performed at a load of 2409 and a thread movement speed of 150±10 steps/yun. The measurement environment was a temperature of 20℃ and humidity (
1'L,)I) 65%, and the sample was pretreated in this environment according to JIS P-8111. Measurements were made in both the vertical and horizontal directions of the sample, and the average value of the two values was taken as the measured value. The static friction coefficient was taken as the peak value at the beginning of the sled movement, and the kinetic friction coefficient was taken as the average value during subsequent movement.

(6) A test was carried out by running 10,000 sheets of B4 size paper using an electrophotographic copying machine (Model FX 4150), and the number of times double feeding occurred was measured.

+71 to the child photocopy machine (FX 3970 type) KteB
A test was conducted by running 10,000 sheets of paper in four sizes, and the number of misfeeds was measured.

In the above examples, when the lubricant content was less than 1.0%, the effect was small, and when it exceeded 10 qb, it was too slippery, causing double feeding and misfeeding.

Effects of the Invention According to the present invention, fatty acid gold l! This paper is made by blending 1g of calcium carbonate with a lubricant such as wax or wax as a filler to provide a neutral paper, which eliminates the problem of photoreceptor problems that occur when conventional neutral paper is used in electrophotographic copying machines. The wear phenomenon is extremely low, and the running performance of the transfer paper inside the copying machine is stable.
Even after making a large wrinkle copy, you can still get a high quality copy.

Claims (1)

[Claims] Neutral paper characterized by containing waxes or fatty acid metal salts in addition to calcium carbonate.