JPH02145899A - Production of paper having cloud type flown color pattern - Google Patents

Abstract

PURPOSE:To efficiently and inexpensively produce the subject patterned paper by allowing a coloring solution containing a dye or pigment having an arbitrary color to flow down on a pulp slurry at a position just after the stock inlet of a paper-producing machine in a specific direction. CONSTITUTION:A coloring solution of a dye, etc., is allowed to flow down on a pulp slurry at a position (a jet flow portion just after a stock inlet where the flow of the pulp slurry is unstable, the concentration of the pulp is dilute and the shaking of the slurry is vigorously carried out) just after the stock inlet of a long net paper-producing machine within a range of + or -90 degree toward the stock inlet based on a standard line directed in the wire-proceeding direction to provide the objective patterned paper. It is preferable that the speed of the machine is low.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to paper with a cloud-shaped color flow pattern for paper and paperboard used for printing, packaging, cartons, front and back covers of books and notebooks, paper for construction materials, etc. It is.

(Prior Art) Conventionally, as represented by suminagashi paper, paper in which black is randomly scattered on paper has existed for a long time and is used for eigun paper, fusuma paper, fan-sided postcards, etc.

Suminagashi paper has been produced since ancient times by filling a brush with dye mixed with a decoction of Sapindalis bark, dropping it onto the water surface and spreading it to create various patterns, and then covering the paper with paper to transfer the patterns. This method is manufactured by hand-shoving.

This method has been limited to artistic use by some hobbyists due to its extremely low productivity and therefore high cost.

Furthermore, as symbolized by the name suminagashi, although there were slight variations in the pattern and differences in shading, the color was limited to black, and this, combined with the high price, was a factor that hindered the expansion of its uses. . There is also a known production method in which a colored liquid is poured into a pulp slurry on a wire in a paper machine to form a linear colored pattern and the paper is used as wrapping paper.
Although the colored liquid was diffused during the dehydration process and the striped pattern was blurred, the linear pattern still remained and was different from the patterned paper diffused into the snow layer of the present invention.

(Problems to be Solved by the Invention) The present invention was developed with the aim of efficiently producing suminagashi paper using a paper machine and providing it to the market at low cost. We were able to create a new, colorful fancy paper that goes beyond the concept of simple suminagashi.

Paper machines can be broadly classified into fourdrinier paper machines and circular wire paper machines, and the present invention uses a fourdrinier paper machine.

In a Fourdrinier paper machine, from the outlet of a stock inlet (hereinafter abbreviated as inlet) pulp with a concentration of around 1%, that is, around 99% moisture, is ejected into a wire part, dehydrated, and sent to a dryer part via a press part. The place where the dye or pigment diluted with water to a concentration of several percent (hereinafter referred to as 1 coloring liquid) is added is the jetting part of the pulp slurry immediately after the inlet outlet where the flow is stable and dehydration does not start. Be in the lean part of the valve concentration.

It needs to be an area where shaking (vibrating the wire across the width of the machine to maintain the consistency of the paper) is being performed vigorously.

Even if a colored liquid is added to a wire part that does not meet the above conditions, the colored liquid will not diffuse into the snow layer and a linear pattern will remain. Fourdrinier paper machines operate at high speeds, so one drop of coloring liquid is not enough to add a continuous stream of water. Even in the direction of snow, the snow layer is not sufficiently spread,
A problem arises in that a linear pattern remains although it is blurred due to a large amount of dehydration. Furthermore, if the flowing speed of the colored liquid is high, it will not only be difficult to diffuse, but also lead to paper breakage problems.

(Means for solving the problem) As a result of extensive research into how the coloring liquid should be added in order to obtain a good snow layer color flow pattern paper, we decided to direct the water flow direction of the coloring liquid in the opposite direction to the direction in which the wire travels. In other words, we found that good results can be obtained by adding within an angular range of ±90 degrees toward the inlet with the wire traveling direction as the reference line.1
This is the completed version of the present invention.

As mentioned above, if the colored liquid flows down in the direction of flow of the pulp slurry, the pattern will not be sufficiently diffused and a linear pattern will remain.Even if the angle was changed, there was a slight difference, but this tendency did not change. There wasn't.

The water flow of the coloring liquid is undesirable, as it is not only a sudden jet, but also falling from a high position on the wire will cause turbulence in the flow of the pulp slurry and break the paper's texture. It is necessary to add at a speed.

In addition, the diameter and pitch of the nozzle from which the water stream flows out must be set to optimal conditions based on the pattern density of the target paper product, the speed of the wire part, the degree of shaking, the basis weight of the paper to be made, the density of the pulp slurry, etc. There is.

No matter how you adjust the aperture, pitch, and direction of the coloring liquid nozzle, generally at papermaking speeds of 200 m/min or higher, the color groups will not disperse into the snow layer and a linear pattern will remain, resulting in a good pattern. A low machine speed is preferable to obtain the desired product.

(Function) As described above, in the present invention, on the wire part immediately after the inlet outlet in the papermaking stage, the colored liquid is applied to the pulp slurry from the outlet to the direction opposite to the flow of the stock with the wire traveling direction as a reference line. By adding within a range of 90 degrees, it was possible to obtain a colored paper with one colorant dispersed in the snow layer.

By adjusting the flow angle, flow height, amount of liquid of one color, concentration, etc. of the colored liquid, it is possible to obtain a variety of different patterns of stationary patterned paper.

By selecting various colors and the number of colors, it is possible to obtain any colorful patterned paper.

(Example) Examples of the present invention are shown below.

Example 1 30 parts of softwood bleached kraft pulp (NBKP).

A pulp consisting of 70 parts of hardwood bleached kraft pulp (L B K P) is beaten in a refiner and has a freeness of 450c, c using a Canadian freeness tester.
, Bind this with Arayo Kagaku Kogyo's size pine N705
, 25 parts and 3 parts of Polystron 117, and 5 parts of sulfuric acid were added to prepare a 1% aqueous solution of Gokoku Dyes@GSPN black pigment as a coloring solution.

Steel pipes with an inner diameter of 1.5 mm and a length of ioam are attached to a 1-inch iron pipe at a pitch of 5 cm, and the outlet of the thin steel pipe is placed immediately downstream of the inlet at a height of 15 am above the wire. The colored liquid is made to flow down onto the pulp slurry spouted from the outlet in the opposite direction to the flow of the wire.

Using a size press, add about 4 ounces of a mixture of 2.5% each of PVA and Suzu powder.
A paper with a weight of 70 g/+n" was obtained by coating with 0 g/♂. This paper is a free-standing black patterned paper in which the black pigment diffused into the free surface and even penetrated into the back surface.

Example 2 The coloring liquid and size press liquid for paper stock 1 are the same as in Example 1.

Place the outflow tube for the colored liquid on the wire part in the same way as in Example 1, and bend the tip of the thin steel tube in the same direction at 45 degrees toward the inlet.1 The outflow tube allows the colored liquid to flow onto the pulp slurry. The paper was poured and coated with the size press liquid in the same manner as in Example 1 to obtain 70 g/m'' paper.By changing the flow angle of the colored liquid, a patterned paper with a pattern different from that in Example 1 was obtained. Ta.

Example 3 The paper stock and size press liquid were the same as in Example 1.2.As coloring liquids, DP1530 Orange manufactured by Dainichiseika Chemical and DP1534 Blue manufactured by the same company were each made into a 1% solution. Iron pipes with a pitch of 10 cm between copper outflow pipes with an inner diameter of 1.5 mm attached to 1-inch iron pipes were placed in parallel in the horizontal direction of the machine immediately above the inlet so that the outflow pipes were at the same interval, and orange liquid was attached to each iron pipe. The blue liquid was poured separately and flowed out in the opposite direction to the flow of the wire in the same manner as in Example 1, and the size press liquid was coated to obtain a snow layer pattern in which the two colors were combined at 100 g/m2.

Example 4 A 1-inch iron pipe with an inner diameter of 1.5 mm and a length of 10 to 20 cm.
Install steel pipes at a pitch of 15cm. Create three similar iron pipes and adjust the tips of the thin steel tubes so that they are at 0 degrees, 45 degrees, and 90 degrees for each iron tube based on the reference line with respect to the inlet, and the tips are evenly spaced. It flows down into the pulp slurry through the iron pipe of the pie in such a manner that it is arranged in the following manner.

The paper stock and size press liquid are the same as in Example 1.

In this way, paper with a weight of 150 g/m was obtained.

The resulting paper is a cloud pattern paper in which three colors are dispersed in random directions.

Note 1 % and parts in the examples are 1 part by weight.

2 The drug concentration was calculated based on the concentration of the commercially available product as 100%.

(Effects of the Invention) As described above, the paper of the present invention can be used to produce conventional suminagashi paper, or paper colored by flowing a colored liquid down over a wire part where a linear pattern remains although it has been partially diffused. Unlike , various colors are sprinkled on the mold and the position of adding the coloring liquid,
By slightly adjusting the aperture, pitch, angle, height, liquid volume concentration, density, etc. of the nozzle, it is possible to obtain paper with a slightly changed cloud pattern. If necessary, a wider variety of patterned papers can be obtained by changing the color of the paper stock. This is because the paper has a pattern created by colored liquid.

It is possible to provide patterned paper that is free from processing problems such as falling off of foreign objects and poor ink adhesion due to protrusions, as is the case with patterned papers made of additives that are currently in use.

Claims (1)

[Claims] 1) A colored liquid in which dyes or pigments of any color are dissolved is applied onto the pulp slurry immediately after the stock inlet of the paper machine at an angle of ±90 degrees toward the stock inlet with the wire traveling direction as a reference line. By flowing down within the range,
A method for producing colored paper with a cloud-shaped colored pattern formed on the paper surface. 2) The method for producing a cloud-shaped color flow pattern paper according to claim 1, wherein the coloring liquid such as a dye or a pigment is composed of two or more independent and different colors.