JP3353199B2 - Pattern paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a brown or black fibrous or dot-like pattern which is uniformly dispersed.
The present invention relates to a pattern paper having no protrusions on its surface and having excellent strength, especially excellent surface strength.

[0002]

2. Description of the Related Art Pattern paper is also called fancy paper, and is currently widely used in the fields of decoration, packaging, printing, etc. according to its appearance characteristics. Conventionally, as a method for producing a pattern paper, a method by dyeing, a method by various embossing rolls, a method of forming various colored substances or plant substances in a wet paper machine, and the like are known. Among them, a method for producing a pattern paper by adding a specific substance when making paper in a wet paper machine using pulp fibers as a raw material is described in, for example, Japanese Patent Publication No. 53-45412.
JP-A-62-125099 discloses a method of pulverizing wood, pulverizing the obtained pulp in a screen and pulverizing and adding screen meal generated in a step of screening. And the method of adding
JP-A-61597 discloses a method of pulverizing and adding wood and shells, and JP-A-1-162899 discloses a method of pulverizing and adding rice hulls, seed hulls or bran, and JP-A-4-82.
In Japanese Patent Application Laid-Open No. 999-999, crushed coffee beans and their extracted lees are added. In Japanese Patent Application Laid-Open No. 6-235198, stems, leaves, seeds, shells, skins, fibers, etc. of various plants are cut or crushed and added. A method for doing so is disclosed.

[0003] In a patterned paper obtained by pulverizing the above-mentioned various specific plants, adding the pulverized material to a papermaking raw material, and making the paper, such a pulverized product remains in the region of an additive for showing a pattern to the last. Can not play a role in the role of pulp fibers, and therefore, when such additives are used at a high addition rate, the degree of entanglement between pulp fibers that develops the strength of paper will be reduced, It may cause a decrease in strength. Further, when printing is performed on a pattern paper using such an additive, there is a problem that the additive easily peels off from the surface of the paper, that is, a so-called picking trouble easily occurs. In manufacturing such a patterned paper, a manufacturing technique that takes into account the reduction in strength and the problems related thereto has not been embodied.

[0004]

Papyrus reeds are plants that have been used as paper substitutes since ancient times, and grow naturally in rivers and swamps in Africa and the Middle East.
A type of reed growing in the Nile basin in the Sud area, it is an aquatic perennial plant belonging to the family Cyperaceae. In Japan, papyrus reeds, also known as oysters, are known for their superior water purification properties by absorbing large amounts of nitrogen and phosphorus, and have recently been cultivated in ponds around the Kansai region in Japan. Became popular. However, in Japan, the temperature is low in winter, so papyrus reeds die in one year and eventually rot if left untouched. As a result, the papyrus reed used for purification of water quality has a problem of contaminating the water.

In practice, papyrus reeds are harvested before they die, and a portion of the reaped papyrus reeds is used in the manufacture of ancient paper. At present, the yield of papyrus reeds is small, but its water purification effect will be reviewed in the future, and if it is cultivated in ponds in various places, effective use of it will be desired. As one method of effective utilization, if the yield is large, papyrus reeds are cooked to produce pulp,
There is a method of using as a papermaking raw material. This method of effective utilization can be said to be a more desirable method in terms of global environmental protection because it can further contribute to papermaking resources even after once improving the global environment such as purification of river water.

[0006] In view of this situation, the present inventors have studied pulping of papyrus reeds. As a result, when papyrus reeds are used as a pulp raw material, papyrus reeds can be divided into a corolla and a stem, but the entire trunk uses an alkaline cooking liquid such as a soda cooking liquid, an alkaline sodium sulfite cooking liquid, and a kraft cooking liquid. The pulp obtained by digesting the pulp is extremely excellent in bonding strength and bending strength such as tensile strength and burst strength, and this pulp can be used together with other pulp as a raw material for papermaking. Although the resulting pulp shows the same properties as pulp from the whole stem, pulp from the corolla contains fine fibers such as colored fine fibers and parenchymal cells derived from the corolla containing many inorganic components. Many of these are difficult to remove by screens and are not easily bleached, so if this pulp is used as a raw material for papermaking together with other pulp, papermaking can be carried out using ordinary information printing paper. It is then noticeable foreign substances and impurities and was not able to withstand for practical use.

Therefore, the present inventors have found that the use of pulp obtained by cooking with an alkaline cooking liquor without separating the corolla of the papyrus reed and the whole trunk in advance as a raw material for paper makes it possible to obtain fine fibers derived from the corolla. Fine brown or black whisker-like fibers and dots are evenly dispersed in the paper, and the paper becomes a patterned paper with no protrusions on the surface of the paper. Since the paper contains a specific amount of the pulp, the paper has a pattern as if the colored fibers are dispersed, and has excellent bonding strength and bending strength.
In particular, it has been found that the colored fibers forming the pattern do not easily peel off from the paper surface, and that the patterned paper has excellent surface strength and is suitable for printing, and has completed the present invention. An object of the present invention is to have a pattern in which brown or black fibrous and dot-like patterns are uniformly dispersed,
An object of the present invention is to provide a pattern paper having no protrusions on its surface and having excellent strength, especially excellent surface strength.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a patterned paper characterized by containing at least 10% by weight of pulp obtained by cooking together the whole trunk of a papyrus reed and a corolla without separating it. is there.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Papyrus reeds used in the present invention are aquatic plants cultivated in rivers, lakes, ponds and the like.
Domestic or foreign. This papyrus reed uses the whole trunk and corolla. In the digestion of papyrus reeds, the digestion is not limited to a specific method, and a digestion method and conditions for digesting wood chips are usually used. However, since the bulk weight is lower than that of wood chips, the liquid ratio is 4 to 20. , Preferably 5
15 range. Papyrus reeds are raw (immediately after cutting)
Contains a large amount of water (for example, 87% by weight), but the water evaporates during storage, and when it is in a dry state (for example, 15 to 20% by weight), a liquid ratio of 4 to 10 enables digestion. In the case of the cooking method, for example, in the case of the Kraft method, the degree of sulphidation is 5 to 60%, preferably 10 to 40%.
5 to 40% by weight of absolutely dried papyrus reeds as ₂ O,
Preferably in the range of 10 to 30% by weight, the cooking temperature is 110
To 180 ° C, preferably 130 to 170 ° C.

[0010] When the digestion is the alkaline sodium sulfite method,
Addition ratio of sodium sulfite is 5 to 40 wt% per absolute dry papyrus reeds weight as Na ₂ SO _3, preferably 20 to 30
% By weight, the addition ratio of caustic soda is 1 to 20% by weight, preferably 2 to 10% by weight of absolutely dried papyrus reed as NaOH
% By weight. The cooking temperature is 1 as in the Kraft method.
The temperature is in the range of 10 to 180C, preferably 130 to 170C. In the case of soda cooking, cooking conditions such as temperature, time, and effective alkali addition rate are the same as in the case of kraft cooking. In the cooking method, a cooking aid such as sodium polysulfide or a known cyclic keto compound or anthraquinone and its derivatives may be added to a kraft cooking liquor or a soda cooking liquor. Can be used.

[0011] The cooked papyrus reed pulp is subjected to the usual washing and selective treatment of pulp to obtain unbleached pulp. Unbleached pulp is used as is to emphasize fibrous and pointy patterns. However, if necessary, one-stage bleaching may be performed with a bleaching agent such as hydrogen peroxide or hypochlorite, or C (chlorine) -E (caustic soda)-
Multi-stage bleaching, such as H (hypochlorite) -D (chlorine dioxide), may increase the whiteness of the pulp. However, although it is difficult to bleach, the bleaching reduces the fibrous and dot-like colorings of papyrus reeds, and reduces the effect of forming patterns in the pulp. %. In the present invention, unbleached or bleached papyrus reed pulp is used by mixing with other pulp to form a pattern paper. In that case, the content of papyrus reed pulp in the pattern paper is 10% by weight or more. If the content is less than 10% by weight, the pattern as a pattern paper becomes inconspicuous, and thus it is not suitable.

On the other hand, a pattern paper can be produced only from papyrus reed pulp. In this case, the bonding strength such as tensile strength and burst strength and the bending strength are extremely excellent, but the tear strength is low and the density is very low. The paper becomes higher and tighter, giving a different texture to printing information magazines and wrapping paper made from ordinary wood pulp, so that it can be used only for special applications. Therefore, in order to disperse the fibrous and dot-like patterns uniformly as a pattern paper, and to make the patterns appear vividly on the surface of the paper, and to obtain a paper having the same texture as known paper, the content of papyrus reed pulp is required. Is preferably in the range of 15 to 75% by weight per bone dry pulp weight.

The pulp to be blended with the papyrus reed pulp includes wood pulp and deinked pulp which can be used for papermaking, and non-wood fibers such as linter, hemp, bagasse, kenaf, esparto grass, bamboo and straw. Pulp, synthetic pulp and the like can be mentioned, and in the present invention, these are appropriately selected and used from these. The above pulp may be either unbleached or bleached pulp, or a mixture thereof, or may be dyed pulp, and may be used in an appropriate combination as long as the effects of the present invention are not impaired. Since the papyrus reed pulp alone contains a lot of parenchyma cells and exhibits a low freeness of 70 to 150 ml CSF, when used in combination with other pulp, the other pulp before mixing is lightly beaten, The mixed pulp is used as a papermaking raw material without beating.

The above-mentioned papyrus reed pulp or pulp containing papyrus reeds is made into a paper stock, made into paper by a known wet paper machine, and dried into a patterned paper, but the papermaking conditions are not particularly specified. . If necessary, in addition to fillers such as talc, kaolin, heavy calcium carbonate, and light calcium carbonate, various commonly used anionic, nonionic, cationic or amphoteric retention improvers, drainage improvers, Papermaking chemicals such as paper strength enhancers and internal sizing agents, as well as dyes, fluorescent brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like are also used.

[0015]

The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto. In Examples and Comparative Examples,% means that:
Unless otherwise specified, it is weight%.

The unbleached pulp from papyrus reeds used in the examples and comparative examples of the present invention was produced by alkaline sodium sulfite cooking as follows. After 180 g of absolutely dried dried papyrus reeds (16% moisture) was put into a 4 liter stainless steel laboratory autoclave, the liquid ratio was 6, 25 g / liter of sodium sulfite as Na ₂ SO ₃ , and sodium hydroxide as NaOH. The digestion liquor prepared so as to be 5.2 g / l was poured into an autoclave and digested at a maximum temperature of 165 ° C and a holding time at the maximum temperature of 2.5 hours. After cooking, the spent cooking liquor was separated, the pulp was defibrated for 5 minutes with a high-concentration defibrillator, and then with a flat screen for experiment using a screen plate with slits of 10 cuts (10/1000 inches). The pulp that passed through the screen and passed through the screen was subjected to an experiment as high-quality pulp, and the pulp that had not passed through the screen was removed as unpulped product. Thereafter, the high-quality pulp was centrifugally dewatered. The kappa number of the obtained pulp is 9, and the yield of high quality pulp is 45.0.
%, The undigested product yield was 0.1%, and the hunter whiteness of the pulp was 28%.

EXAMPLE 1 The corolla of papyrus reeds and the whole trunk were separated without separation.
The selected pulp obtained by cooking by the cooking method (alkaline sodium sulfite) was used alone (papyrus reed pulp content: 10%).
0%) using a TAPPI standard disintegrator, and then hand-milled with non-beaten (freeness 75 ml CSF), and 60 g of rice tsubo
/ M ² of patterned paper was produced. The measurement of the physical and optical properties of the pulp used to make the patterned paper is based on TAPP
I test method T205os-71 (JIS P 8209)
According to the above, a sheet having a basis weight of 60 g / m ² was prepared by the following test method. (1) Whiteness: JIS P 8123 (2) Tensile strength (rupture length): JIS P 8113 (3) Burst strength (specific burst): JIS P 8112 (4) Tear strength (specific tear) JIS P 8116 (5) Folding strength JIS P 8115

Further, the surface strength and the state of the pattern of the obtained patterned paper were evaluated as follows. (1) Surface Strength A RI printing suitability tester type II manufactured by Akira Seisakusho was used as a tester. 0.5 g of tack ink (SMX tack grades 10, 15, and 20, trade name, PrintingInk, manufactured by Toyo Ink Mfg. Co., Ltd.) was placed on the roll of No. 4 and kneaded while inverting the roll so as to be uniform on the roll surface. 1cm
Attach the backing paper with the test paper of the width attached, print at a predetermined speed, pick up from the surface of the test paper on the rubber roll by picking and back it on another paper and judge it in 5 steps as follows did. The above test was performed using the above three types of inks having different tackiness, and comprehensively evaluated. 5. No picking has occurred. 4. Picking hardly occurs. 3. Picking is slightly occurring. 2. Picking has occurred considerably. 1. Picking has occurred remarkably.

(2) State of the Pattern The surface of the pattern paper was visually observed, and the state in which fibrous and dot-like impurities were dispersed was determined according to the following criteria. A: The dispersion is uniform and the pattern is vivid.・ ・ ・: The dispersion is somewhat uniform and the pattern is excellent. Δ: The dispersion is uniform, but the pattern is not bright. ×: There is no pattern.

Example 2 The same papyrus reed pulp as used in Example 1 was beaten lightly with a PFI mill (1000 rpm, freeness 500 mlC
SF) hardwood bleached kraft pulp was mixed at a weight ratio of 1: 1 (papyrus reed pulp content 50%), and TAPPI
After disintegration using a standard disintegrator, it is not beaten (freeness 190
(mlCSF) to produce a patterned paper having a rice tsubo of 60 g / m ² . A quality test of the mixed pulp used for producing the patterned paper and the obtained patterned paper was performed in the same manner as in Example 1.

Example 3 The same papyrus reed pulp as used in Example 1 and bleached hardwood bleached kraft pulp (freeness 500 ml CS)
F) was mixed at a weight ratio of 1: 3 (papyrus reed pulp content: 25%), defibrated using a TAPPI standard defibrillator, and then hand-milled with unbeaten (freeness: 280 ml CSF).
A pattern paper of 0 g / m ² was produced. A quality test of the mixed pulp used for producing the patterned paper and the obtained patterned paper was performed in the same manner as in Example 1.

Comparative Example 1 A hardwood bleached kraft pulp beaten with a PFI mill to a freeness of 460 ml CSF was disintegrated using a TAPPI standard disintegrator and then hand-milled to produce paper having a rice tsubo of 60 g / m ² .
The quality test of the pulp used for producing the paper and the obtained paper was performed in the same manner as in Example 1.

Comparative Example 2 Only the stem excluding the corolla of papyrus reed was digested by the above-described digestion method (alkaline sodium sulfite), and the selected pulp obtained and the unbeaten hardwood bleached kraft pulp at a weight of 1: 3. Mixing (papyrus reed pulp content 25%), TAP
After disintegration using a PI standard disintegrator, it is not beaten (freeness 1
The paper was hand-made with 10 ml CSF) to produce a patterned paper having a rice tsubo of 60 g / m ² .

Comparative Example 3 Extracted residue of roasted coffee beans pulverized to an average particle size of 3 mm or less and hardwood bleached kraft pulp beaten with a PFI mill to a freeness of 460 ml CSF were mixed at a weight ratio of 5:95 (coffee Bean extraction residue content 5%), TAPP
After disintegration using an I standard disintegrator, hand-milled
g / m ² of patterned paper was produced.

The results obtained in the examples and comparative examples are shown in Table 1.

[0026]

[Table 1]

As is clear from Table 1, the pattern paper (Examples 1 to 3) obtained from 100% of pulp obtained from the corolla of the papyrus reed and the whole trunk or from the mixed pulp of the papyrus reed pulp and LBKP was used. It shows a pattern in which colored fibrous (dots from brown to black) and dot-like fine mottles mainly derived from the corolla of papyrus reed are uniformly dispersed on the surface, and there is no protrusion on the surface of the patterned paper. Its surface strength is LBK
Compared to paper without any pattern from P (Comparative Example 1), it is remarkably high, and is also excellent in bond strength such as breaking length and rupture and bending strength. On the other hand, when cooking is performed except for the corolla portion (Comparative Example 2), the number of patterns as in the present invention is extremely small and cannot be put to practical use as patterned paper. When the coffee bean extract residue is mixed (Comparative Example 3), the residue is exposed in a convex shape on the surface of the paper, easily falls off at the time of printing and causes picking, and thus cannot be put to practical use.

[0028]

According to the present invention, there is provided a patterned paper having a pattern in which brown to black fibrous and dot-like patterns are uniformly dispersed, having no protrusions on the surface and having excellent strength, particularly excellent surface strength. This has the effect.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Genjiro Yano 2-2-13 Kotono-cho, Chuo-ku, Kobe City, Hyogo Prefecture Inside the Kobe Papyrus Research Institute (56) References JP-A-8-120593 (JP, A) (58) ) Fields surveyed (Int. Cl. ⁷ , DB name) D21H 11/00-27/42 WPI (DIALOG)

Claims (1)

(57) [Claims] 1. Pulp obtained by cooking together the whole trunk of papyrus reeds and the corolla without fractionation is at least 10%.
A pattern paper characterized by containing by weight.