JP2000170090A - Japanese paper-like bagasse paper as paper form for unconventional name card, letter paper or the like, and production of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing paper forms such as unconventional, Japanese paper-like name cards and letter paper which enables easiness on the global environment to be insisted from non-wood pulp alone on a large scale at a low cost. SOLUTION: This Japanese paper-like bagasse paper comprises conventional bagasse pulp as a main ingredient and rind pulp of binding lint from Panicum miliaceum and for as an auxiliary ingredient, is genuine non-wood paper, has bulkiness and strength different from wood paper and makes fiber appearance remain. The binding lint pulp is prepared by cutting stems of Panicum miliaceum diagonally and in parallel, by the removal of sap and pith to acquire long rind and by treating the rind with an alkaline cooking liquor to acquire pulp having various kinds of strength such as tear strength. The binding lint pulp as an auxiliary ingredient is mixed with conventional bagasse pulp as a main ingredient and the mixture is subjected to papermaking without almost or wholly being beaten.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unique Japanese paper-like bagasse paper such as business card paper and stationery paper using only non-wood pulp without using any wood pulp, and a method for producing the same.

[0002]

2. Description of the Related Art The use of business cards, stationery, envelopes, and the like made of Japanese paper or Japanese paper using long fiber pulp, such as bast pulp, abaca, etc., is one of the unique luxury hobbies. Department has been done. Recently, as the interest in the global environment has increased, the use of wood pulp
It has been practiced to use 00% non-wood pulp paper for business cards and stationery, but long fiber pulp, which is originally used as a raw material for Japanese paper, is expensive. On the other hand, conventional pulp of bagasse (sugar millet pulp) is required at a low price, but the resulting paper has a high density because the fibers are short, the drainage is poor, the suitability for papermaking is low, and the pentosan content is high chemically. It was hard, had low strength such as tear strength, was easily crisp, and was evaluated as a substitute.

[0003]

The problem to be solved by the present invention is that bagasse pulp obtained by a conventional method is used as a main raw material, and lined pulp of millet having a long fiber is used for connection, and wood pulp is not used. It is an object of the present invention to provide a high-class Japanese paper-like business card, stationery and the like paper which is bulky and retains long fibers, and a method for producing the same.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, a line is taken out from stems of millet cultivated to obtain sugar, such as sugar cane and sweet sorghum, so that long fibers are not damaged, and the line is digested with an alkaline cooking chemical. In the state of long fibers, take out pulp with good drainage for connection, mix it with conventional bagasse pulp and lightly beat it, leaving long fiber form, almost or no long fiber pulp such as hemp There is provided a Japanese paper-like paper which can be used for unique business card letter paper and the like, which can be claimed to be environmentally friendly without being bulky and has high performance such as strength.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The raw material of the connecting pulp used in the present invention is sugar cane or sugar syrup such as sweet sorghum, and millet cultivated to obtain sugar. The millet that takes these sugar solutions has a hard line on the outside,
The interior is composed of pis (medulla) and cane juice. In the present invention, the largest millet that can be used as a raw material for pulp for strong connection is milling as a first step without crushing the mill as in a conventional sugar mill as a pretreatment. Of the stem of the trunk diagonally and in parallel 3-60m thick
m, preferably 6 to 30 mm in thickness, cut in parallel, and after dewatering, separate and remove pis and cane juice to remove large amounts of long milled fiber as a long line that becomes a raw material for pulp without damaging long fibers. It is made possible. This means that even if the stem is cut diagonally to the same thickness of 30 mm, the line length obtained by cutting the stem at right angles is 3 mm.
0mm, but if cut at 30 °, the thickness of the stem is 30mm
And the length becomes 60mm, and the cut at 20 ° is 30m thick
The effect is also explained when the length becomes 88 mm in m.

[0006] A long line can be obtained by cutting the stem of millet obliquely, separating the sugar solution from the scum (bagasse), and further separating the pis from the bagasse. As a device to be used, a chipper or a similar machine is used to cut the stem stem diagonally. In addition to screw presses, compression desiccation equipment such as the roll press used in conventional sugar factories is most suitable for squeezing millet chips, for bagasse washing and residual sugar recovery. The collection device and the diffuser device having the countercurrent washing function can be used efficiently. Highest quality brown sugar can be obtained from the sugar solution that is the most squeezed. In addition, since the thin but colorless and transparent recovered sugar liquid has few non-fermented components, its wastewater is extremely clean and environmentally friendly to the earth when used for the production of yeast, etc., compared to the conventional dark brown molasses used as a culture medium. It is possible to reduce the load. The separation of line and pis in the pomace of the present invention can be easily performed by either a dry method or a wet method. Lined has good drainage and is a raw material for pulp with high tear strength and various strengths. In the conventional method, when the sugar solution is squeezed from sugar cane, both the line and the pis in bagasse are crushed like rice hulls, and fine fibers which can be said to be the third intermediate component are formed. For this reason, it was difficult to separate and remove finely crushed lines and pis from coarsely crushed lines. The resulting pulp also contained many fine fibers and pis, had poor drainage, and had low strength including tear strength.

In the second step of cooking with an alkaline cooking liquor, an AP using an aqueous solution containing only caustic alkali as the cooking liquor is used.
And a KP method and a PA (hydrogen peroxide-alkali method) method using a mixture of caustic alkali and alkali sulfide as a cooking chemical. The PA method is a pulping method in which at least one or more of the following cooking aids is added to an alkaline solution of hydrogen peroxide to prepare a cooking chemical liquid.

[0008] Examples of the cooking aid in the PA method include a chelating agent, anthraquinones, a magnesium compound, a polar organic solvent that can be arbitrarily mixed with water, and oxygen if desired. The alkaline solution used in the PA method is a hydroxide of potassium or sodium, and it is more desirable that the carbonate thereof coexist. The amount of alkali (hereinafter referred to as the absolute dry weight of the raw material line) is 13 to 30%, preferably 17 to 22% in terms of Na2O, and the causticization ratio is 50 to 95%, preferably 70 to 85%. In addition, due to the coexistence of carbonates, fiber damage is small, and a high yield of pulp can be expected. The amount of peroxide used to release hydrogen peroxide when injected into water such as hydrogen peroxide or percarbonate is 0.5 to 15 in terms of H2 O2.
%, Preferably 1.0 to 5%. The amount of the cooking aid used varies depending on the type of auxiliary, but the amount of the chelating agent is 0.02.
１1%, preferably 0.1-0.3%. Anthraquinones are 0.003 to 1%, preferably 0.05 to
0.3%. The magnesium compound is 0.05 to 0.1.
5%, preferably 0.1 to 0.3%. The polar organic solvent arbitrarily mixed with water is 0.02 to 1%, preferably 0.05 to 0.3%.

[0009] In the digestion of lined by the PA method, the lined and the cooking liquid of the PA method (optionally pressurized with oxygen) are added to a vessel made of a material such as stainless steel that can withstand contact with hydrogen peroxide. . Cooking temperature is 90 ~ 180 ℃,
Preferably 110-150 ° C, digestion time 10-360.
Minutes, preferably 20 to 120 minutes. The liquid ratio is 3 to 12 L / kg, preferably 5.0 to 7.0 L / k by liquid phase cooking.
g. In the gas phase digestion, it is 1.2 to 3.0 L / kg, preferably 1.5 to 2.5 L / kg. According to the gas-phase cooking, it is possible to reduce the unit steam consumption, and it is possible to collect the pulp waste liquid at a high concentration, so that it is possible to reduce the size of a concentrating device and the like, and to reduce the amount of steam for concentration.
It is environmentally friendly and economically advantageous. According to the PA method, the pulp obtained is higher in yield and superior in strength than the AP method. Also, compared to the KP method, no odor is generated,
Environmental measures are extremely easy, the pulp yield is high, the color of unbleached pulp is much lighter, and bleaching is easy, which is economically advantageous.

In the third step, papermaking of Japanese paper can be carried out using only the above-mentioned tethered pulp and conventional bagasse pulp, and hemp has conventionally been said to be effective in providing strength and luxury. It is also possible to add little or no long fiber pulp. Bagasse pulp used as the main raw material can be obtained by AP method, KP method, PA method, etc.
A pulp method manufactured using an alkaline cooking liquid can be used. Particularly, pulp produced by the PA method has a high degree of whiteness, a high tensile strength and a high bursting strength, and a good bleaching property even when not exposed, so its use is good. preferable. Papermaking is performed by a conventional method. That is, paper making by a fourdrinier paper machine, a twin-wire machine, a multi-tank-type round paper machine or a short net yankee machine is possible. Prior to papermaking, the freeness is adjusted to C.I. by a desk refiner or a beater. S. F. 400 to 650 cc, preferably about 500 to 650 cc, but the milled pulp obtained by pulping the millet line by the PA method can increase various strengths by light beating as much as the freeness is high. Since it is possible, it is convenient for manufacturing Japanese paper-like paper which is bulky and retains the fiber shape. At the time of paper making, a sizing agent, a wet paper strength enhancer and other auxiliaries are added according to preference, and the original material concentration is 0.1 to 0.8%, preferably 0.3 to 0.5%, and the wire part of the paper machine is used. Supply. The raw material supplied is formed into a wet paper with a wire part, sent to a press part to squeeze water, and further sent to a dry part for drying, and has a density of 0.3 to 0.7 g / cc, preferably 0.1 to 0.7 g / cc. The paper is finished in a strong, Japanese paper style with a bulk of 35 to 0.55 g / cc.

According to the present invention, by using bagasse pulp as a main raw material and using millet lined pulp as a connecting pulp, a business card of Japanese paper style which is bulky only with non-wood pulp without using wood pulp. It is possible to provide a unique sheet of paper such as stationery and a method of manufacturing the same.
That is, conventionally, bagasse pulp has a low strength, and it has been considered impossible to produce paper having a normal basis weight simply. Further, if strong beating was performed to make a cardboard having a large basis weight, the pentosan content in the raw material was large, so that drainage was further deteriorated, making papermaking difficult, and the resulting paper was hard and crisp. In the present invention, a long line is taken out by cutting the millet of the raw material plant diagonally and in parallel, and this is subjected to alkali digestion, preferably PA digestion, to increase the drainage which has been conventionally regarded as low, and to increase the tearing height. And other pulp with high strength, and use it as a connecting pulp to produce Japanese paper bagasse paper that is light, beaten, or strong at all and has a large bulk of fibers. It became possible to do.

[0012]

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[0013]

Embodiment 1

A sugar millet chip having a thickness of 20 mm and a length of 40 mm was prepared with a chipper equipped with a motor in which 3,000 kg of sugar cane stem was fixed to a rotating plate with two blades fixed at an angle of 30 °. Sugar millet chips with a screw press for solid content 4
It was disrupted and desalted to 5%. The cane juice obtained by destruction and desiccation was concentrated by a conventional method to obtain a high-quality first-squeezed brown sugar. Sugar millet chips after destruction and desiccation were washed with a countercurrent washing machine to remove residual sugar and used as a yeast medium. After washing out the residual sugar,
Bagasse was squeezed again with a screw press, and the pis and line were separated and removed using a 10-mesh vibrating sieve with a dry motor in a dry system. 210 kg was obtained in terms of quantity.

The sodium salt-based PA method (liquid ratio 1.8 L / kg, active alkali: Na 2 O 1
8%, causticization rate 85%, hydrogen peroxide: 3 as H2 O2
%, DTPA as a chelating agent 0.3%, ethyl anthraquinone as anthraquinones 0.1%, NMP (normal methylpyrrolidone) as a polar organic solvent arbitrarily mixed with water 0.1%, magnesium compound Magnesium oxide at 0.2% at 125 ° C for 2 hours)
Was subjected to gas phase digestion. The unbleached pulp obtained by the gas phase cooking in the PA method was further subjected to two-stage bleaching. That is, the first stage is treated with alkaline hydrogen peroxide, the second stage is treated with chlorine dioxide, and the whiteness is 83% and the freeness is C.I. S. F. 715c
c, bleached milled pulp having a breaking length of 5.8 km, a specific burst strength of 3.4, and a specific tear strength of 106 was compared with a lined pulp of 5
Obtained in 0% yield.

The high quality paper is made of bagasse pulp (whiteness 81.8%, freeness CSF 500c) by the AP method.
c, tear length 2.8 km, specific burst strength 2.3, specific tear strength 45) to 70%, and the bleached PA method pulp with a freeness of C.I. S. F. 30 beaten to 650cc
%, Adding 0.2% of alkyl ketene dimer,
A paper was made by a conventional method using a fourdrinier paper machine for testing with an original material concentration of 0.3%, and washi-style paper (density: 0.45 g / cc, whiteness: 82.8%, breaking length: 4.8 km, 2. Specific burst strength
0, specific tear strength 87).

[0017]

EXAMPLE 2 The sugar cane stem was used to obtain PA obtained in Example 1.
Pulp obtained by digesting abaca waste by the PA method under the same conditions as in Example 1 (break length 9.2 k)
m, specific burst strength 4.5, specific tear strength 189) 5%,
Was blended with 85% of the conventional bleached AP of bagasse, and the freeness C.I. S. F. Beat to 510 cc, add a neutral sizing agent, use a fourdrinier paper machine for testing, and use a conventional method of Japanese paper business card paper with a basis weight of 120 g / m ² and 60 g.
/ Yield stationery paper stationery paper and 85 g / m ² of m ^2. The business card paper showed a density of 0.47 g / cc, a breaking length of 3.8 km, a specific burst strength of 2.9, and a specific tear strength of 85, and other papers also showed almost the same values.

[0018]

Embodiment 3 2,000 kg of sweet sorghum stems as millet are mounted on a rotating plate with a motor-driven chipper having two blades fixed at an angle of 30 °, with a thickness of 15 mm and a length of 30 mm.
mm chips were made. Sweet sorghum chips were disrupted and desalted to 43% solids with a screw press. The sugar solution obtained by disruptive desalting was treated in a bioreactor having immobilized invertase to obtain invert sugar. After destruction and desiccation, the chips were washed with a countercurrent washing machine to remove residual sugar, and a 4.5% concentration sugar solution was recovered and used as a culture medium for food yeast. After the sugar was washed out, the bagasse was squeezed again with a screw press, and then the piss and the line were separated and removed with a 10-mesh vibrating sieve equipped with a motor. 150 kg was obtained in terms of dry weight. The line obtained by desugaring and depissing is a potassium-based PA digestion solution (liquid ratio 1.8 L / kg, active alkali: 18% as Na2 O, causticization rate 85%, hydrogen peroxide: H2 O2). 3%, 1-hydroxyethane-1 as a chelating agent
-1 diphosphonic acid 0.3%, anthraquinone 0.1%
%, NMP 0.1%, magnesium oxide 0.2%)
At 125 ° C. for 2 hours. By the PA method, whiteness was 52%, kappa number was 4, and freeness was C.I. S. F. An unbleached PA pulp of sweet sorghum of 710 cc, a breaking length of 6.7 km, a specific burst strength of 4.0 and a specific tear strength of 120 was obtained at a line ratio of 52%. This pulp was bleached in two stages under the same conditions as the unbleached sugar mill pulp of Example 1 to obtain a sweet sorghum bleached pulp. The papermaking of high quality paper was 80% bleached pulp by the AP method of bagasse of the same lot used in Example 2 and bleached P of lined.
A method pulp was blended with 20%, an alkyl ketene dimer was added at 0.2%, and the raw material concentration was 0.3%. 125 g / m
² business card paper was obtained. This paper has a density of 0.47 g / c
c, the breaking length was 3.8 km, the specific burst strength was 2.9, and the specific tear strength was 85.

Claims (5)

[Claims] (1) It is mainly made of ordinary bagasse pulp, and is a tough and bulky material which is blended with a long-fiber millet lined pulp (thick bark of the trunk) for connection and uses no wood pulp. Japanese paper bagasse paper as paper for personalized business cards such as letter paper. 2. The milled lined pulp obtained in a long fiber state is used as a connecting pulp without beating lightly or at all, and the bagasse pulp obtained by a usual method is used as a main raw material without lightly or completely beating. The method according to claim 1, wherein a complete sample is prepared without using wood pulp, and a strong and bulky bagasse paper is formed. 3. The process of cutting the stem of sugarcane or millet such as sweet sorghum diagonally and in parallel, draining and depissing, and extracting the millet line as a pulp raw material in a long fiber state. In a first step, the line is treated with an alkaline cooking chemical, and in a second step, a chemical pulp having high tear strength and various strengths is obtained as a lined pulp for connection. The pulp waste liquid is concentrated and burned, and alkali and energy are removed. 3. The method according to claim 1, wherein the third step is to collect and reuse the chemical for alkali cooking next time. 4. An alkaline cooking liquor for obtaining lined pulp for tethering is prepared by the PA method (a chelating agent, anthraquinones, magnesium compounds, oxygen and water as an auxiliary cooking aid in an alkaline solution of hydrogen peroxide). And a liquid containing at least one kind of polar organic solvent mixed at an arbitrary ratio with the above). 5. The method according to claim 1, wherein the alkaline cooking liquor for obtaining bagasse pulp as a main raw material is a cooking liquor of the PA method.