JPH08325999A - Patterned paper - Google Patents

Abstract

PURPOSE: To obtain patterned paper of good distinguishability without adverse effect on its paper layer strength by paper-making pulp slurry to which small lumps of bacteria cellulose colored with a dye or pigment. CONSTITUTION: Acetobacter aceti subsp. xylinum (ATCC 10821) is inoculated to a culture solution and cultured to form a get film containing white bacteria cellulosic polysaccharide, then washed with water and tinted in a prescribed hue using a dye or pigment. Then, water is added so that the concentration of the solid phase is lowered less than 0.1wt.%, stirred with a mixer to give a suspension of small lumps of bacteria cellulose with an average diameter of 1mm. Kraft pulp is beaten to pulp slurry, which is combined with light calcium carbonate, a sizing agent and the bacteria cellulose. The slurry is subjected to paper-making, and the paper is dried, size-pressed and calendered to give the objective patterned paper of improved distinguishability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a patterned paper which contains a small lump of bacterial cellulose to improve the discriminating property without impairing the strength of the paper layer.

[0002]

2. Description of the Related Art Various types of patterned paper are often used for paper stationery such as envelopes, notepapers and cards for the purpose of design and differentiation from others. As the pattern paper, there is known a paper in which a predetermined pattern is printed in advance, or a paper in which colored fibers, fiber dregs, synthetic resin film and the like are incorporated into the paper.
From the viewpoint of design, it is said that the latter, in which the pattern is generated from the entire paper layer, is superior.

Techniques for forming patterns by incorporating various types of identification materials into paper include paper stocks such as those disclosed in Japanese Patent Publication No. 56-016328 and Japanese Patent Publication No. 61-019304. As disclosed in Japanese Patent Publication No. 3-47360 and Japanese Patent Laid-Open No. 63-270897, a technique for mixing paper with a small amount of special fibers such as colored fibers and photochromic fibers is used for coloring or printing. For example, there is a technique of cutting a water-soluble polymer film or a piece of paper into a paper.

[0004]

The method of mixing colored fibers is a classical method, but since a pattern is formed in the dispersed state of fine fibers, it is difficult to distinguish it with the naked eye and a characteristic pattern is formed. There are drawbacks such as difficulty in forming. Further, in the method of drawing a water-soluble film or a piece of paper, the strength of the paper layer at that portion is weakened, which causes a problem of partial peeling of the paper during printing or subsequent processing.

The present invention relates to a technique for imparting a distinguishable pattern to a pattern paper in which some distinguishing substance is contained in the paper layer without changing the strength of the paper layer. That is, it is an object of the present invention to provide a pattern paper having improved distinguishability without impairing the strength of the paper layer.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, as a result of studying the kinds of identification substances to be contained in a paper layer, it was found that the inclusion of a small lump of bacterial cellulose can obtain a desired patterned paper. Became clear. Bacterial cellulose can be obtained in various shapes such as granules, films, and blocks by adjusting the culture conditions or disaggregation conditions.Because the composition of cellulose is the same as that of pulp fibers, pulp fibers are formed by hydrogen bonding. It is involved in easily bonding with.

The bacterial cellulose of the present invention means any one of cellulose, a heteropolysaccharide having cellulose as a main chain, a glucan such as β-1,3, β-1,2, etc. produced by a microorganism, or a mixture thereof. It is a mixture. In the case of the heteropolysaccharide, the constituent components other than cellulose are hexose, pentose, mannose, fructose, galactose, xylose, arabinose, rhamnose, glucuronic acid and the like, and organic acids and the like.

Microorganisms that produce bacterial cellulose include, but are not limited to, Acetobacter aceti.
Acetobactor acetisubsp
xylinum) ATCC 10821 or the pasturean
(A.pasteurium), the same license (A.rancens), Sarcina ventriculi (Sarcina ventriculi), bacterium
Bacterium xyloides, bacteria of the genus Pseudomonas, bacteria of the genus Agrobacterium, etc. that produce bacterial cellulose can be used. In addition,
As the culturing method, both stationary culture and aeration stirring culture can be used.

Bacterial cellulose obtained by static culture is a gel-like film, and therefore, after being adjusted to a small lump of arbitrary shape,
Add to stock. Further, since the bacterial cellulose obtained by aeration and agitation culture is gel-like particles, it is possible to add a small lump of a predetermined size to the paper material by adjusting the culture conditions. There is no particular limitation on the size of the blob, but the average diameter is 0.2 mm considering the distinctiveness with the naked eye.
It is preferable that it is above. The amount added to the paper is preferably 0.1% or more by dry weight. If necessary, it is possible to add the gel after dehydrating it with a press or the like, and further to add the once-dried gel re-swelled.

When small pieces of bacterial cellulose are directly drawn into paper, a sheet having locally different light transmittance is obtained, and an effect similar to a watermark can be expected. Also, by adding a small lump of bacterial cellulose that has been subjected to a coloring treatment in advance, it is possible to obtain a sheet with further excellent pattern distinctiveness. In addition to the usual coloring dyes and pigments, special dyes and pigments such as fluorescent dyes, thermochromic pigments and photochromic pigments, and white pigments such as calcium carbonate and titanium dioxide can be used for the coloring treatment.

As the method of coloring, in addition to dyeing of gel in water and fixing of pigment, printing on dried film of bacterial cellulose is possible. However,
It is necessary to immerse the dried bacterial cellulose in water for sufficient swelling, and then disintegrate or punch it into a predetermined shape and add it to the stock.

The patterned paper of the present invention optionally contains a dye, a filler, a sizing agent, a fixing agent, a dry paper strengthening agent and the like which are usually used in papermaking. Furthermore, it is also possible to apply starch, polyvinyl alcohol, or the like to the paper surface by a size press or the like. For the production, a Fourdrinier paper machine, a cylinder paper machine, a twin wire paper machine, an on-top paper machine and the like are used, and a monolayer or a multilayer sheet is produced.

The patterned paper of the present invention may be provided with various functional coating layers on the surface depending on the application.
As a coating device at that time, an air knife coater, a gravure coater, a curtain coater, a die coater, a blade coater, or the like is used.

The pattern paper of the present invention is used as a paper for stationery such as envelopes, stationery, cards, office supplies, etc., or as a paper for functional cards having a functional coating layer such as heat-sensitive and magnetic on the surface. It

[0015]

The pattern paper containing the small lumps of bacterial cellulose of the present invention has excellent paper layer strength and distinctiveness.

[0016]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples. The present invention is not limited to the embodiments. All parts and% in the following are by weight.

Example of preparation of bacterial cellulose Sucrose 5 g / dl, yeast extract 0.5 g / d
1, ammonium sulfate 0.5g / dl, potassium hydrogenphosphate 0.3g
/ Dl magnesium sulfate (MgSO ₄ 7H ₂ O) 0.0
50 ml of medium (pH 5.0) having a composition of 5 g / dl
Pour into a Erlenmeyer flask with a capacity of 200 ml, and
It was sterilized by steam for 20 minutes to prepare a culture solution. Next, yeast extract 0.5 g / dl and peptone 0.3 were added to this culture solution.
Acetobacter aceti subsp. xylinum (ATCC 10821) grown on a test tube slant agar (pH 6.0) having a composition of g / dl and mannitol 2.5 g / dl for 3 days at 30 ° C. Inoculated and cultured at 30 ° C.

After culturing for 15 days under the above-mentioned conditions, white bacterial cellulosic polysaccharide of 0.
A 5 mm thick gel-like film containing 5% was formed. After washing this gel-like membrane with water, water was added so that the solid content concentration was 0.1% by weight, and the mixture was stirred for 10 seconds under the condition of 500 rpm with a laboratory mixer to consist of small lumps of bacterial cellulose with an average diameter of 1 mm. A suspension was obtained.

Example 1 To 100 parts of pulp obtained by beating hardwood kraft pulp with a refiner (DDR) to a freeness of 350 ml, 5 parts of light calcium carbonate (TP121, manufactured by Okutama Kogyo Co., Ltd.) was used.
Part, alkyl ketene dimer size agent (SPK-90
3, Arakawa Chemical Co., Ltd.) and 0.7 parts of amphoteric starch (Kate 3210, manufactured by Oji National Co., Ltd.) were added to the stock material, and 0.5 parts by dry weight of the bacterial cellulose blob of Preparation Example was added. Was added. Using this raw material, paper having a basis weight of 100 g / m ² was produced by a Fourdrinier paper machine. The paper dried with a multi-cylinder dryer was size-pressed with a 3% aqueous solution of oxidized starch, dried, and then machine calendered. This paper is referred to as Sample 1.

Example 2 As a small lump of bacterial cellulose, the gel-like membrane after washing with water described in the Preparation Example was added to a 1% aqueous solution of Congo Red 24
A paper was obtained in the same manner as in Example 1 except that the one prepared by immersing for a time, dyeing, disintegrating and using was used. This paper is sample 2
And

Example 3 The bacterial cellulose nodules of the preparation example were mixed with titanium dioxide (3).
Paper was obtained in the same manner as in Example 1 except that the material was stirred in a 0% aqueous solution for 24 hours, washed with water and disintegrated, and then added to the stock. This paper is referred to as Sample 3.

Comparative Example 1 A paper was obtained in the same manner as in Example 1, except that 0.5 parts of Congo red dyed softwood kraft pulp fiber was added in place of the bacterial cellulose clumps. This paper is referred to as Sample 4.

In Example 1, except that a red-colored film-like PVA disk (diameter 1.0 mm) having a thickness of 25 μm was added in place of the bacterial cellulose blobs.
Paper was obtained in the same way. This paper is referred to as Sample 5.
Table 1 shows the measurement results of the paper layer strength and the evaluation results of the distinguishability of the above samples.

The bond strengths in Table 1 are based on the TAPPI test method UM.
It is the value measured according to 403, 300 gcm / i
If it is n ² or more, it can be judged that the paper layer has a strength enough to withstand a processing step such as printing. The distinctiveness is the result of visual evaluation of the distinctiveness of the pattern, and indicates that A is the best and C is inferior. As pattern paper, B or more, preferably A is required.

[0025]

[Table 1]

From the comparison of Samples 1 to 3 and Samples 4 and 5 in Table 1, it can be seen that, when a small lump of bacterial cellulose is added, it has good paper layer strength and distinctiveness as compared with the case where it is produced by the conventional technique. It is clear that a paper is obtained. Sample 1
It is also clear from the comparison of Samples 2 and 3 with the addition of colored bacterial cellulose nodules that their effects are particularly excellent.

[0027]

The pattern paper of the present invention, that is, the pattern paper containing a small lump of bacterial cellulose,
It has excellent paper layer strength and distinguishability. The effect is particularly remarkable when small bacterial cellulose particles colored with a dye, a pigment or the like are contained.

Claims (3)

[Claims] 1. A pattern paper containing a small mass of bacterial cellulose. 2. The pattern paper according to claim 1, wherein the small lumps of bacterial cellulose are colored with a dye, a pigment or the like. 3. A small mass of bacterial cellulose 0.1%
The pattern paper according to claim 1 or 2, characterized by containing the above.