JP3379033B2 - Dry pulp nonwoven fabric broke blended paper and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry pulp non-woven fabric broke containing paper which has been conventionally disposed of by a method such as incineration, and a method for producing the same.

[0002]

2. Description of the Related Art As a method for producing a dry pulp nonwoven fabric,
There is a curl royer method or a Honshu paper manufacturing method.
In each case, dry wood pulp is defibrated by a special hammer mill method, and the defibrated single fibers are suspended in an air stream and fed onto an endless wire mesh that moves in the horizontal direction to form a web. , A binder is applied to both sides by a spray method, dried, and defibrated single fibers are fixed to each other to form a continuous sheath.
Is what you get. As the raw material, wood pulp is used, but other plant fiber pulp can also be used, and chemical and synthetic fibers may be used in combination in some cases. As the binder, an aqueous emulsion of ethylene vinyl acetate, styrene acryl, vinyl acetate or the like is mainly used, but a heat-fusible fiber such as polyethylene may be blended. The obtained sheet is characterized by being extremely bulky as compared with paper and wet non-woven fabric. That is, the apparent density (g / cm ³ ) is 0.4 to 0.9 for paper and 0.1 to 0.5 for wet non-woven fabric, while 0.04 to 0.09 for dry pulp non-woven fabric. Is.

Since the dry pulp non-woven fabric mainly uses a water resistant binder such as ethylene vinyl acetate, waste generated in the manufacturing process and the finishing and processing steps thereafter (hereinafter referred to as spoiled paper). ) Becomes a bundling fiber mass in the dry disaggregation method in the same manufacturing process, and if disaggregation is continued, it becomes fine fiber and cannot be disaggregated into the original single fiber form, so it is recovered as a non-woven fabric raw material. The reuse method is not established, and most of them are disposed of by incineration or other methods. On the other hand, we attempted disaggregation by using a disintegrator such as pulper to reuse it as a pulp material for papermaking, but it is difficult to disintegrate the whole into single fiber, and the reuse method including that for papermaking has not been established yet. Absent.

[0004]

As described above, dry pulp non-woven fabric spoiled paper is difficult to be disintegrated by both the dry method and the wet method due to the characteristics of the binder used. As a pulp raw material for pulp, the method of reuse has not been established, and it is the current situation that it is discarded.

The object of the present invention is to develop a blended paper which can reuse such a dry pulp nonwoven fabric broke that is difficult to be made into single fibers as a pulp raw material for papermaking, and to study and establish a manufacturing method thereof. is there.

[0006]

According to the present invention, conventionally, a broke of a dry pulp nonwoven fabric is mechanically defibrated, but is not bound into a single fiber but is a bundle of fiber lumps (hereinafter referred to as fiber lumps). However, although it has not been reused as a raw material for papermaking, it is freeness (JIS P8121).
According to "Canadian Standard Form" in "Pulp Freeness Test Method". same as below. ) Was used to make a paper mass by dispersing a fiber mass in a papermaking pulp slurry, and conventionally, in Japanese paper, a long binding fiber of chemical / synthetic fibers such as mulberry, sanpei, goosehide, or rayon was mixed in the raw material. When a pattern paper such as Unryuu paper is obtained, and when the amount of compound is further increased, a pattern paper with unevenness on the surface is obtained, and the fiber lumps increase the bulk of the paper and form convex portions. It was found that the convex portion was compressed by the applied printing pressure and was printed evenly, and the present invention was completed.

That is, the present invention defibrates defibrated dry pulp non-woven paper by a dry method such as a hammer mill method or a wet method such as a pulper for papermaking to form a defibrated fiber when it becomes a coarsely disaggregated fiber mass. Stop, mix with the usual raw materials for papermaking, make paper by the wet papermaking method, and make decorative paper with the texture and pattern of handmade Japanese paper, wrapping paper, and paper suitable for many other purposes, It was possible to provide a stable and easy method without preparing special raw materials and equipment.

More specifically, in the case of wet disaggregation, a dry pulp nonwoven fabric broke is dispersed in water with a pulper and treated for a necessary time until it becomes a coarsely disaggregated fiber lump of a size suitable for the purpose. Although usually used as it is, the type and amount of the binder used for interfiber bonding in the production of the dry pulp non-woven fabric vary depending on the application, and there are some disaggregated into single fibers. The single fiber pulp that has passed through the screen is used as a raw material for papermaking pulp, and only the coarsely disaggregated fiber lumps may be used as a pattern forming body. A refiner treatment may be performed to adjust the size of the disaggregated fiber mass.

The wet rough disintegration slurry of the dry pulp nonwoven fabric containing the coarsely disintegrated fiber lumps thus obtained is blended in a predetermined ratio with a usual papermaking pulp slurry whose freeness is adjusted separately. . In this case, by separately dyeing the above-mentioned rough disintegrated material of dry pulp nonwoven fabric and / or pulp for papermaking, it is possible to clearly raise the pattern forming body in the obtained paper. Further, as the pulp for papermaking, any one may be selected and blended depending on the use of wood pulp, recycled waste paper pulp and other products.

Subsequently, a sizing agent, a paper-strengthening agent, aluminum sulfate, and other paper-making chemicals are added to the pulp slurry containing both of the above as required, and a paper-making machine and a product are obtained with a paper-making machine. The paper machine can be used with a fourdrinier or cylinder method. However, devices such as a screen in front of the machine and porous rolls in the flow box that may impede the passage of the coarsely disaggregated fiber mass must be removed beforehand or bypassed. In addition, due to the characteristics of the product, the calender is usually not used or only mild treatment is used.

In the case of dry disintegration, it is advisable to disintegrate with a special hammer-mill disintegrator used in the dry pulp nonwoven fabric manufacturing step, and then the final product is obtained through the same steps as in wet disintegration. .

[0012] Depending on the ratio of the roughly defibrated fiber mass of the dry pulp nonwoven fabric broke to the pulp for papermaking, the basis weight, etc., after drying,
If there is a risk of the fiber lumps falling off, it is possible to prevent the lumps by applying a solution of a surface strength agent such as polyvinyl alcohol to the surface with a size press or the like.

[0013]

[Function] By blending the wet or dry coarse disintegrated material of the dry pulp non-woven fabric into the raw material for papermaking while leaving the coarsely disaggregated fiber mass, the fiber mass acts as a pattern forming body and has a unique texture and pattern. It is possible to obtain a handmade Japanese paper-like paper with a texture. Since the dry pulp non-woven fabric is bulky, its undisaggregated fiber mass is compounded into the paper by the wet papermaking method, and elasticity remains even after papermaking, so unevenness occurs on the surface of the paper, but in offset or other printing, Printing is possible by adjusting the printing pressure.

[0014]

EXAMPLES The present invention will be described with reference to the following examples. The coarse disaggregated material of the dry pulp nonwoven fabric is hereinafter referred to as a coarse disaggregated nonwoven fabric.

Example 1 A dry pulp nonwoven fabric broke was used in a pulper to give a concentration of 3.5%.
In the above, 40 parts of the obtained rough disintegrated nonwoven fabric is subjected to disintegration treatment until it becomes a coarsely disintegrated fiber block having a longitudinal direction of 10 to 30 mm, and a softwood bleached kraft pulp (hereinafter abbreviated as NBKP) 40: a hardwood bleached kraft. Pulp (hereinafter LBKP
Is abbreviated. ) 60 parts are mixed and mixed with 60 parts of pulp adjusted to a freeness of 450 ml by a refiner,
After dyeing with a blue direct dye, add a sizing agent, etc., and then use a Fourdrinier paper machine according to a conventional method to weigh 120 g.
Paper was made so that it would be / m ² . Further, in order to prevent the loosely disaggregated fiber mass from falling off, a 3% by weight solution of polyvinyl alcohol having a saponification degree of 95% or more was applied by a size press during the papermaking process. The blending ratio of pulp and chemicals is shown below. However, all blending ratios are shown in parts by weight, and the blending ratio of chemicals is based on all pulps (the same applies hereinafter). As the rosin sizing agent, size pine N771 manufactured by Arakawa Chemical Industries was used (the same applies hereinafter).

Pulp and chemical compounding ratio Pulp compounding Rough disaggregated nonwoven fabric 40 (part) NBKP 24 LBKP 36 Chemical compounding rosin size agent 1 (solid content) (part) Aluminum sulfate 3 (Al ₂ O ₃ min 8% liquid) Blue Direct dye 0.1 (solid content)

Since the obtained paper has a surface with uniquely large irregularities and rich in cosmetics, and the coarsely disaggregated fiber mass of the blended coarsely disintegrated nonwoven fabric has high elasticity, When it was subjected to offset printing, the print pattern was combined with the irregularities on the paper surface to give a good finish by adjusting the printing pressure. In this way, a printing paper having a soft feeling, in other words, a warm feeling was obtained.

Example 2 A rough disintegrated nonwoven fabric prepared in the same manner as in Example 1 was blended in the surface layer to prepare a multi-layered paperboard having a basis weight of 400 g / m ² with the following constitution. In addition, the champion co-
A 2% by weight solution of polyvinyl alcohol having a saponification degree of 95% or more was applied to the surface with a taper. The obtained paperboard had large cosmetic irregularities on its surface, had a Japanese paper-like mass feeling due to the soft feeling of the coarsely disaggregated fiber mass, and also had printability and box-making suitability. It was a high-grade packaging board.

Composition of Each Layer of Composite Paperboard Surface Layer Middle Layer Back Layer Pulp Blending Coarse Disintegrated Nonwoven Fabric 60 DIP 50 Magazine Waste Paper 100 (Part) NBKP 40 Magazine Waste Paper 50 Freeness 600 350 330 (ml) Chemical Blend Rosin Sizing Agent Rosin Sizing Agent (Parts) 1 1 Aluminum sulphate Aluminum sulphate 3 3 Yellow direct dye 0.01 Combined basis weight 60 280 60 (g / m ² ) In addition, DIP represents deinked newspaper waste paper, and the freeness of each prepared pulp. The value after compounding is shown. The rosin sizing agent and the yellow direct dye are solids, and the aluminum sulfate is an Al ₂ O ₃ 8% solution.

Example 3 The rough disaggregated nonwoven fabric prepared in the same manner as in Example 1 was adjusted with a refiner to a freeness of 500 ml to NBKP.
Was further blended with the chemicals as described below, and a base paper having a basis weight of 500 g / m ² was made into paper by a Fourdrinier paper machine. The obtained coaster base paper had large irregularities, had a low apparent density, had a bulky feeling, and was rich in water absorption.
Further, since it is soft and has cushioning properties, it has a high-grade feeling when used as a coaster.

Pulp and chemical compounding ratio Pulp compounding rough disaggregated nonwoven fabric 50 (part) NBKP 50 drug compounding polyacrylic amide 0.5 (solid content) (part) aluminum sulfate 2 (Al ₂ O ₃ min 8% liquid) poly Acrylic amide is Polytron 1 made by Arakawa Chemical Industry
17 was used.

[0022]

EFFECTS OF THE INVENTION The rough disintegrated material of a dry pulp nonwoven fabric is blended with a pulp for papermaking in a state of coarsely disaggregated fiber lumps, and paper-making is carried out by an ordinary wet paper machine. Due to the texture and flexibility of the coarsely disaggregated fiber mass without the need for special equipment or technology,
It is possible to obtain a Japanese paper-like pattern paper with a unique texture.
Further, by actively using the coarsely disaggregated fiber lumps for this purpose, it is difficult to make them into single fibers, so that it is possible to effectively use the dry pulp nonwoven fabric broke that has not been reused. Further, after the defibration treatment, a screen treatment is performed, and the defibrated into single fibers can be used as ordinary pulp for papermaking.

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Claims (4)

(57) [Claims] 1. A dry-pulp non-woven fabric broke containing paper, wherein a fiber mass obtained by roughly disintegrating dry-pulp non-woven fabric broke is dispersed in the paper to form a pattern. 2. A dry pulp nonwoven fabric broke is coarsely disintegrated by a disintegrator such as a pulper until the fiber mass becomes 10 to 30 mm in the longitudinal direction, and then, as a pattern forming body, in a freeness-adjusted pulp for papermaking. Disperse, screen before machine, porous roll
A method for producing a dry pulp non-woven fabric broke containing paper, which comprises making a paper using a paper machine from which a reel and the like have been removed. 3. A dry pulp non-woven fabric broke is roughly disintegrated by a disintegrator such as a pulper until the fiber mass becomes 10 to 30 mm in the longitudinal direction, and then treated with a screen to bind the disintegrated pulp into single fibers. Separated into fiber lumps that are roughly disaggregated into fiber lumps, the pulp disaggregated into single fibers is used as papermaking pulp,
The method for producing a dry pulp non-woven paper containing spoiled paper according to claim 2, wherein the fiber lump is used as a pattern forming body. 4. The method for producing a dry pulp non-woven fabric spoiled paper according to claim 2, wherein the surface is coated with a polyvinyl alcohol solution by a size press during papermaking with a paper machine.