JPS6215396A - Neutral stabilization method in producing 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 paper manufacturing technology, and relates to a neutral stabilization method in the production of various papers such as Western paper, paperboard, and Japanese paper.

[Conventional technology]

Paper made only from pulp, which is produced by mechanically or chemically processing wood or other plant materials, is water-absorbent, so when you write or print on the paper, the ink bleeds and becomes useless. Water absorption is suppressed by a treatment process consisting of ``and the addition of a filler.'' That is, in the former sizing process, a water-resistant colloidal substance is added to the pulp to cover the fiber surface, zelkova, and the gaps between the fibers to prevent liquid penetration and diffusion. ) A rosin soap solution made by adding soda carbonate or sodium chloride to rosin (pine resin) and boiling it is added to the pulp, and then aluminum sulfate is added to make the colloidal particles of rosin and aluminum rosinate into paper. It is deposited on the surface of the fibers, and the same applies when synthetic sizing agents are used.

In addition, in the latter process of adding filler, minerals are added to the pulp in the beater before and after the sizing process, in order to make the paper opaque to a certain extent and to make the surface smooth and suitable for writing and printing. white powder is added. This filler to be added (= is kaolin (white clay), talc (Iv
In addition to natural products such as stone) Cerakoku and chalk, chemical products such as barium sulfate, calcium sulfate, and carbonate are used.

[Problem that the invention seeks to solve]

As mentioned above, many additives or substances added in the paper manufacturing process are neutralized using chemicals in the finishing process and are generally released in the neutral to slightly alkaline range. As paper ages, the balance of additives is not maintained, and paper fibers become acidic, absorbing moisture from the air and rapidly deteriorating paper fibers. was.

The present invention was made in view of the above problems, and provides a method for stabilizing the neutrality of paper in order to maintain paper in a neutral state for a long period of time and prevent rapid deterioration due to acidic paper formation. The purpose is to

[Means for solving problems]

The paper neutralization stabilization method of the present invention is used in the paper manufacturing process in order to prevent the aging imbalance of the sizing agent, filler, and neutralizing agent added in the paper manufacturing process. In at least part of the water treatment process, treated water consisting of a supernatant liquid obtained by boiling obsidian is used, or treated water consisting of a concentrated liquid of the supernatant liquid is dissolved in water, and obsidian is A large amount of ionic substances including sodium ions, potassium ions, magnesium ions and calcium ions extracted from the paper are mixed between the manufactured paper fibers.

[Effect]

According to the neutral stabilization method for paper, a large amount of metal ions, including sodium ions, potassium ions, magnesium ions, and calcium ions contained in the treated water, remain between the fibers of the paper produced, so paper manufacturing When the sizing agent and filler added in the process change over time (and become "acidic paper"), the above ions combine with the additive and maintain neutrality. In other words, when obsidian is When boiled in obsidian, the gold-containing sodium, potassium, magnesium, calcium, iron, and other metals in the obsidian dissolve into sodium ions (Na
), potassium ion (K+), magnesium ion (y
, ++), calcium ion (Ca++), iron ion y
(pe++) is eluted and transferred into the water, and each ion contained in the treated water causes a large amount of each metal ion to remain in the papermaking process due to the use of the treated water in the papermaking process. It's going to be a long time ago. However, as the paper ages and the neutral balance of the various additives added during sizing and filling processes is lost, the above ions become free elements of the same family that bind to each other. It acts synergistically with other substances and exhibits the property of neutralizing acidity or alkalinity.

Therefore, the paper is kept neutral for a long period of time, and serves to suppress the phenomenon of acidic paper formation in a humid atmosphere.

[Example] Specific examples for carrying out the neutral stabilization method for paper of the present invention will be described below.

First, the treated water used in the water treatment process will be described.

The following table shows the experimental results at the Chuo Hot Spring Research Institute, which measured the main metal ion concentration (p-p-m) and ratio conductivity (μS/'') contained in treated water or water xl. be.

Note-1: Treated water A contains 50g of obsidian and 500ml of tap water.
! This is the supernatant obtained by immersing it in water and leaving it for 48 hours.

2. Treated water B is a supernatant liquid obtained by immersing Obsidian 502 in 500 ml of tap water and leaving it for 150 hours.

3. Treated water C is a supernatant liquid obtained by soaking 50 pieces of obsidian in 500 mal of tap water and boiling for 10 minutes.

As is clear from this test result, when obsidian is boiled in water, ions of metal elements contained in the obsidian are transferred into the treated water, and obsidian has the effect of transferring acidic water and alkaline water to neutral water. Because of the above-mentioned ions, this treated water has a similar neutralizing effect.

However, the above-mentioned treated water or the treated water obtained by dissolving the concentrated solution of the treated water in water is subjected to ``dissolution'', ``sizing'', ``addition of filler'', ``coloring J'' ``refining and selection'', and ``sizing'' in the paper manufacturing process. By using it as treated water in each or at least one of the processes of paper making, the paper fibers are enriched with various metal ions, which remain in the paper after the final drying process. let

As a result, the sizing agent and filler do not turn into acidic paper due to chemical changes over time, maintain neutral stability for a long period of time, and prevent deterioration of the paper.

〔Effect of the invention〕

As stated above (if the paper neutral stabilization method of the present invention is ζ binary,
This not only keeps the paper stable for a long period of time and improves its storage performance (but also protects the paper by neutralizing weakly acidic or alkaline inks, etc.). is extremely doglike.

Claims (2)

[Claims] (1) At least one of the treated water for soaking paper or paper agent used in the paper manufacturing process is a supernatant obtained by soaking obsidian, or a liquid obtained by adding a concentrated solution of the supernatant. 1. A method for stabilizing neutrality in the production of paper, which is characterized in that metal ions are left in the paper by treatment, and non-neutralization of the paper is prevented by the synergistic action of the metal ions. (2) The neutral stabilization method for producing paper according to claim 1, wherein the supernatant liquid obtained from the obsidian is obtained by boiling or pressure boiling the obsidian in water.