JPH07304011A - Board or sheet, mat, cotton mixed material and manufacture of board or sheet - Google Patents

Abstract

PURPOSE:To realize excellent economical efficiency, elasticity, lightweight properties and the like and also use as heat insulating material for building and the like in addition to buffering material and packaging material by a method wherein paper cotton, which is produced by dry-splitting paper, and to which fibers having the average fiber length longer than the average fiber length of the paper cotton and adhesive are added, is pressed into the form of board. CONSTITUTION:By scraping out cotton-like material by every certain amount from the opening bottom of a box with a grooved rotating roller, which is provided at the opening bottom of the box 6, the cotton-like material is placed on an endless conveyor 2 in order to obtain paper cotton sheet. By stirring the laminate, which is produced by pilling up a large number of layers made of paper cotton sheet and of long fiber sheet, with the needles of a mixing roller 3, the paper cotton and the long fibers are mixed together in order to obtain their mixture. Next, the mixture is pneumatically transported with a fan to fed to an auto-feeder 4 in order to be charged in a vertically long box 6. After that, by being scraped out with the grooved rotating roller of a random fleece picker 5 by every certain amount from the bottom of the box 6, cotton mixed material is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a board or sheet,
More particularly, the present invention relates to a mat, a mixed cotton product, and a method for producing a board or a sheet, which contains paper cotton which is defibrated by dry defibration of paper, and fibers having an average fiber length longer than that of the paper cotton. The present invention relates to a board or sheet, a mat, a mixed cotton product, and a method for manufacturing the board or sheet.

The board or sheet of the present invention (hereinafter sometimes represented by the term "boards") and mat are:
Cushioning material for packing electrical products, mechanical parts, electronic devices, ceramics, glass products, food products, etc .; Protective sheet for packing and packaging material;
It is also widely used as a heat insulating material, heat insulating material, sound absorbing material, soundproofing material for buildings. Further, the mat of the present invention can be used for the same purpose as the above boards, and is also useful as a material for producing the boards. Further, the mixed cotton material of the present invention is useful as a material for producing the boards or mats of the present invention.

[0003]

2. Description of the Related Art Conventionally, for example, the following materials have been used as cushioning materials for packing electric products and mechanical parts.
Each of these had its own problems. (I) Synthetic resin materials such as polystyrene foam fillers and polyurethane foams: Expensive, the above materials are not decomposed by bacteria or microorganisms, and remain or accumulate in soil or water to cause environmental pollution or marine life. May be adversely affected (when a marine organism mistakenly eats the above material with food or eats with it, the material accumulates in the body and dies), When the waste products are burned in the furnace, the combustion temperature rises and the furnace wall of the combustion furnace becomes brittle, causing damage and shortening the life of the combustion furnace. To prevent this,
Brick with high heat resistance must be used as the material for the furnace wall, and special furnace wall must be designed and manufactured for that purpose. Further, since harmful exhaust gas is generated when the waste products are burned, it is necessary to make the exhaust gas treatment equipment more complicated and sophisticated in order to prevent air pollution.

(Ii) Waste paper which is used as it is without being pressure-molded (waste paper is simply rolled, waste paper is finely cut with a shredder or the like and packed in a vinyl bag, and finely cut waste paper is provided with an adhesive. In addition to those molded into a prescribed shape, etc.): Low buffering capacity Same problem as (i) above due to synthetic resin materials contained in vinyl bags and adhesives.

(Iii) Paper cotton obtained by wet defibration of paper: Since wet defibration requires an additional drainage treatment device, the device becomes large and the equipment cost increases.

[0006]

Therefore, as an alternative to these conventional materials, used paper is dry defibrated to form a bulky cotton-like material, and the cotton-like material is mechanically compressed and molded, and water is removed. A buffer material (Japanese Patent Application No. 5-98895) prepared by spraying and then drying to bond pulp fibers to each other is mentioned. However, regarding the cushioning material as well,
It was found that there was a problem as shown in.

Problems Due to Average Fiber Length The cotton-like material obtained by the dry defibration has a fiber length of 0.
The length is from 1 mm to 3 mm at maximum, and the fiber is short. Such short fibers tend to be lumps because the fibers do not tend to be entangled or overlap with each other, and if they remain as they are, they will not be connected in the longitudinal direction and will be in a chopped state. , Board, sheet)
It is difficult to mold into. This problem is not ameliorated simply by adding water as in the above application. A molded article such as a mat can be produced using the above cotton-like material by applying a surface pressure of 1.5 kg / cm ² or more as a compressive force. Hardness is similar to cardboard, lacks elasticity, and is unsuitable as a cushioning material.

A product obtained by mechanically compression-molding the above-mentioned cotton-like material has a small recovery force, and even if the mechanical compression is released, it is 10 before the compression.
The thickness recovers only up to about 1 / thickness. As in the above-mentioned application, the one in which water is sprayed and dried before and after mechanical compression is applied has a poorer recovery force (that is, lacks elasticity). In the method of the above-mentioned application, a step of spraying water Therefore, the manufacturing process is complicated and the productivity is poor. Further, since a heater is required for drying, energy consumption increases. In the method of the above application, molding by mechanical compression and the filler (starch paste etc.) contained in the waste paper are wetted and further dried. Therefore, it is expected that the pulp fiber will be in an adhesively bonded state and thus formability and shape retention will be obtained. However, in reality, most of the starch paste in the paper is modified from α-starch to β-starch at the stage of the paper manufacturing process, and therefore sufficient adhesion cannot be obtained by simply adding water. In order to effectively exert the adhesive force of starch, it is necessary to raise the temperature to 80 ° C. or higher, or to add a new starch paste, which complicates the manufacturing process and lacks productivity.

The present invention has been made in view of the problems of the above-mentioned conventional materials, and the first object of the present invention is to use paper cotton that has been dry defibrated and made into a cotton shape. Therefore, it is excellent in economy, elasticity, lightness, etc., and can be used not only as a cushioning material and a packaging material but also as a heat insulating material for construction, a soundproofing material, a board, that is, a wide range of boards, Another object of the present invention is to provide a mat that can be used as a material for producing the boards or for the above various uses. The second object of the present invention is to provide a material useful for producing the boards and mats of the present invention. Third of the present invention
An object of the present invention is to provide a method for producing the above-mentioned boards of the present invention.

[0010]

DISCLOSURE OF THE INVENTION The board of the present invention comprises a paper cotton which is defibrated by dry defibrating paper, a fiber having an average fiber length longer than the average fiber length of the paper cotton, and an adhesive. The gist is that it is contained and press-formed into a board shape or a sheet shape. The mat of the present invention is formed into a mat shape by containing paper cotton obtained by dry defibrating paper into a cotton shape, and fibers having an average fiber length longer than the average fiber length of the paper cotton. Has the point. The mat of the present invention may further contain an adhesive.

The mixed cotton material of the present invention is characterized in that it contains paper cotton obtained by dry defibrating paper into a cotton shape, and fibers having an average fiber length longer than the average fiber length of the paper cotton. The above-mentioned mixed cotton material of the present invention may further contain an adhesive. The method for producing boards according to the present invention uses a cotton wool which is defibrated by dry defibrating paper, and a cotton blend containing fibers having an average fiber length longer than the average fiber length of the paper cotton. The gist is to add an adhesive at the point of time and cure or solidify the adhesive while press-molding to form a board or sheet.

[0012]

First of all, a description will be given of the mixed cotton material used for producing the boards and mats of the present invention. The mixed cotton material of the present invention includes a paper cotton obtained by dry defibrating paper into a cotton shape (hereinafter, may be abbreviated as paper cotton), and a fiber having an average fiber length longer than the average fiber length of the paper cotton ( Hereinafter, it may be simply referred to as a long fiber).

The paper used in the present invention is not particularly limited, but includes newspapers, telephone directories, magazines, advertising papers, printed publications,
Cardboard, OA paper, computer paper, etc. are used, but it is recommended to use these waste papers for effective use of resources. As a method of dry defibrating the paper, it is preferable to process the paper previously cut into a strip shape with a cutting machine such as a shredder to be processed with the dry defibrating machine, but the cutting machine to be used need not be limited to the shredder. Alternatively, for example, the paper may be finely cut by hand, or may be directly put into the defibrating machine without being cut. Examples of the dry defibrating machine include the dry defibrating apparatus described in Japanese Patent Application No. 5-265895. The paper thus dry-defibrated is a fibrous cotton-like material.

The long fibers used in the present invention are fibers having an average fiber length longer than that of the above-mentioned paper cotton. The average fiber length of the paper cotton is about 0.1 to 3 as described above.
mm, and it is sufficient for the long fibers to have an average fiber length longer than this, and it is preferably several centimeters. Since the above-mentioned long fibers have a longer average fiber length than paper cotton in this way, they act as a tie when mixed with paper cotton. The material of the long fibers is not particularly limited, and examples thereof include the following.

Examples of the natural fiber material include cotton (egypt cotton, rice cotton, etc.), hemp (cannabis, jute, manila hemp, cho hemp, flax, bow hemp, sisal hemp, kenaf, ramie, etc.), suhu and the like. These may be new ones, but also in terms of cost reduction, these semi-finished products of natural fiber materials (defective products or ear pieces that are produced when making cloth or packing materials for clothes from cotton, linen, suf, etc.) Etc., and these are called anti-hair). Plant fiber materials and animal fiber materials other than the above, which have not been conventionally used as paper materials, are also used. Examples of the plant fiber material include coconut fiber, coconut fiber,
Examples of the sugar fiber include sugar cane fiber, and examples of the animal fiber material include wool, cashmere hair, alpaca hair, and rabbit hair.

Synthetic fiber materials may be mixed. Examples of the synthetic fiber material include polyamide-based, polyester-based, polyacrylic-based, polyvinyl alcohol-based, polyvinyl chloride-based, polyvinylidene chloride-based, polyolefin-based (polypropylene-based and polyethylene-based), polyurethane-based, polytetrafluoroethylene-based The materials include. Furthermore, inorganic fibers such as silicon carbide fibers, carbon fibers, and glass fibers may be mixed for the purpose of imparting a special function such as combustion resistance.

Thus, the mixed cotton material of the present invention contains paper cotton having a short average fiber length (usually about 1 to 2 mm) and fibers having an average fiber length longer than that of the above-mentioned paper cotton (usually in several cm units). Therefore, the following effects (1) to (4) can be obtained.

The entanglement and overlap of fibers increase,
Since fibers can be bonded to each other and become difficult to break, continuous molded products such as boards and mats (hereinafter sometimes abbreviated as molded products) can be efficiently manufactured. Since the above-mentioned mixed cotton has a high shape-retaining property depending on the bonding state of the short fibers and the long fibers, the effect of using the adhesive can be remarkably exhibited without waste. Therefore, the addition amount of the adhesive required when a molded product is produced using the mixed cotton material is the addition amount (10 to 30%) when the paper cotton obtained by the conventional wet defibration treatment is used. Can be reduced (5 to 20%). A molded product having a desired specific gravity and thickness can be produced by appropriately changing the content of long fibers, the amount of adhesive added, and the pressure during press molding. For example, by increasing the content of long fibers, the specific gravity can be further reduced without lowering the bending strength. The specific gravity of the molded product produced by using the above cotton blend is usually
Although it is small at about 0.05 to 1.0, it has a high bending strength and bending elastic modulus, so it is used in a wide range of fields such as heat insulating materials, soundproofing materials, and veneer substitute boards for construction, in addition to cushioning materials and packaging materials. be able to.

As described above, the mixing ratio of the long fibers (the ratio of the long fibers to the total amount of the cotton and the long fibers mixed, hereinafter the same) is
Depending on the field of use of the molded product, the moldability /
In order to secure shape retention, it is preferably 5% or more and 60% or less, more preferably 10% or more and 40% or less. If this mixing ratio is less than 5%, the entanglement of the fibers becomes insufficient, the strength and elasticity of the molded product become weak, and handling becomes difficult. On the other hand, this mixing ratio is 60
On the other hand, if it exceeds%, the strength becomes too high and the buffering ability is insufficient, and the manufacturing cost also increases.

In a preferred embodiment, the cotton blend of the present invention further contains an adhesive agent in addition to the above-mentioned paper cotton and long fibers.
By thus preliminarily containing the adhesive, it becomes easy to mold the mat and further the boards from the mixed cotton material. The adhesive is not particularly limited as long as it has adhesiveness, and examples of such an adhesive include a natural material, a thermosetting resin, a thermoplastic resin and the like. These adhesives may be used alone or in combination of two or more. The content of the adhesive is preferably 5% or more and 20% or less based on the total amount of the cotton mixed material. If it is less than 5%, the strength is insufficient to maintain the shape as a molded product, while if it exceeds 20%, on the contrary, the strength becomes too high and the buffering ability is insufficient.
Manufacturing costs also increase.

Of the above-mentioned adhesive materials, a natural material represented by starch paste is preferable. The cost of starch paste is about one-tenth that of thermosetting resin, the manufacturing cost can be reduced, and since it is a natural material, it is highly biodegradable and less likely to be accumulated in soil or the like. Examples of such starch paste include wheat flour, barley flour, rye flour, corn starch, tapioca starch, guar mannum, defatted soybean, glue paste and the like.

The above-mentioned thermosetting resin is useful as a material capable of increasing the strength of the molded product. Examples of such thermosetting resin include phenol resin, urea resin,
Examples thereof include melamine resin, urea resin, epoxy resin, unsaturated polyester resin and the like. Examples of the thermoplastic resin include polyvinyl alcohol, carboxymethyl cellulose, polyamide, polypropylene, polyethylene,
Examples thereof include polyester. Or animal blood meal,
You may mix glue and the like. In addition to the above adhesive, a preservative, a fungicide, a flameproofing agent, a flame retardant and the like may be further added. By adding these materials, a molded article having the characteristics of each material can be obtained, so that the usage range of the molded article can be further expanded.

Next, the mat of the present invention is formed into a mat by containing paper cotton obtained by dry defibrating the above-mentioned paper into a cotton shape, and fibers having an average fiber length longer than the average fiber length of the paper cotton. It is formed and, in a preferred embodiment, further contains an adhesive. Here, the types, contents, and the like of the paper cotton, the long fibers, and the adhesive, which are the constituent materials of the mat, are all the same as those described in the mixed cotton material of the present invention. A method of forming a mat-like material using the above-mentioned constituent materials will be described later.

The boards of the present invention contain paper cotton obtained by dry defibrating paper into a cotton shape, fibers having an average fiber length longer than the average fiber length of the paper cotton, and an adhesive to form a board shape or It is pressed into a sheet. Here, the types and contents of the paper cotton, the long fibers, and the adhesive, which are the constituent materials used for the boards, are all the same as those described in the above-mentioned mixed cotton of the present invention.

The boards of the present invention are obtained by press-molding the above-mentioned constituent materials into a board shape or a sheet shape, and have a thickness ranging from 2 to 3 mm to about 50 mm. On the other hand, since the mat of the present invention is a molded product before press molding, it goes without saying that the mat is thicker, but the thickness is not limited even when the mat-shaped product is used as a final product.

The method for producing boards according to the present invention uses paper cotton which is defibrated by dry defibration of paper and a cotton blend containing fibers having an average fiber length longer than the average fiber length of the paper cotton. Then, an adhesive is added at an arbitrary point of time, and while being press-molded, the adhesive is cured or solidified to form a board or sheet. The manufacturing process will be described below with reference to FIGS.
The details will be described.

FIG. 1 is a schematic view showing a manufacturing process of the blended cotton product of the present invention. First, as described above, a cotton-like paper cotton is put into the breast hopper 1 by using a dry defibrating device or the like. Next, the paper cotton supplied from the breast hopper 1
While being placed on a conveyor sheet in which sharp needles are embedded and conveyed, the fibers are blown off by a rotating brush provided directly above the conveyor to open the fibers to form a soft cotton-like material. The cotton-like material thus obtained is pneumatically transported by a fan to be filled in a vertically long box 6, and by means of a grooved rotary roller provided at the bottom of the opening of the box 6, the cotton-like material is constantly fed from the bottom by a fixed amount. While scraping off, it is placed on the endless conveyor 2 to obtain a paper cotton sheet. A long fiber sheet is obtained by treating long fibers in the same manner as in the production of the above-mentioned cotton sheet. Note that the paper cotton sheet and the long fiber sheet may be manufactured on the same floor or on different floors, but in the drawings, for convenience,
The manufacturing process of the long fiber sheet is described above the manufacturing process of the paper cotton sheet. The obtained long fiber sheets are sequentially placed on the above paper cotton sheet. In this way, after stacking the paper cotton sheet and the long fiber sheet in a multi-layered manner, by inserting the needle of the mixing roller 3 (which is a roller having a sharp needle attached to the surface of the roller and rotated) and agitating it, Paper cotton and long fibers are mixed to obtain a mixture thereof. Next, this mixture was pneumatically transported by a fan to be supplied to the auto feeder 4 and filled in a vertically long box 6, and then a random free picker 5 was used to make a fixed amount of the mixture from the bottom using a grooved rotary roller. The mixed cotton product of the present invention is obtained by scraping off each of them. In the above manufacturing process, an adhesive may be appropriately added at the stage of producing the paper cotton sheet and the long fiber sheet. The mixed cotton thus obtained is used for the mat production process of the present invention.

The method for producing the mat of the present invention includes:
Basically, a method for producing a single-plate mat by laminating the above-mentioned mixed cotton material in a mat shape having a desired size, a specific gravity, a thickness, etc., and a method for shaping the mat into a desired shape (for example, , A method of forming a coiled material while re-forming a mixed cotton material into a long sheet shape and further winding it.

First, a method for manufacturing a single plate mat will be described. The above-mentioned mixed cotton material is placed on an endless conveyor, and laminated with a web cross layer in a mat shape having a desired size, specific gravity, thickness and the like. This laminating method is not particularly limited and may be laminated as it is, or may be laminated after cutting the above-mentioned mixed cotton material to a required size.

Next, an adhesive is applied to this laminate. Even without adding a new adhesive in this way, a certain amount of adhesive strength can be obtained with the starch paste contained in the paper cotton, but in order to further increase the adhesive strength, it is possible to add more adhesive strength. May be recommended. The time of supplying the adhesive is not limited to this, and it is also possible to apply the adhesive at an appropriate time (for example, before laminating) in the above process. Examples of the method for applying the adhesive include the following methods (1) to (3).

The adhesive is blown off under compressed air and sprinkled onto the sheet. The adhesive is dissolved in water and sprayed under compressed air. In the above and above, the pressure of the compressed air is usually 5 kg / cm ² in terms of instrument air pressure. Add the adhesive by flipping it off with a rotating brush. The entire laminate is impregnated with a solution of adhesive.

There is no particular limitation on the application site of the adhesive in the above items 1 to 3, and it may be applied to the interface of the laminate or to the surface of the laminate. Alternatively, in addition to the adhesive, a preservative, an antifungal agent, an anti-inflammatory agent or the like may be added.

As described above, the mat of the present invention is used as a material (that is, an intermediate) for producing the boards of the present invention and a final product usable for the same purpose as the boards of the present invention. Sometimes used as. When the mat of the present invention is used as a material for producing boards, it is recommended that the material is highly elastic so that it can be easily press-formed into the shape of boards and the shape is retained in the press-formed state. Therefore, after applying the adhesive or the like, at room temperature without further heating, or even if heated, by heating to a temperature within the range that does not cause curing by the thermosetting resin, by solidifying the adhesive , Mat for board production.

On the other hand, when the mat of the present invention is used as the final product itself, it may have a certain level of strength, so that the application temperature of the adhesive may be room temperature or may be heated. The heating temperature can also be raised to a temperature at which the thermosetting resin is cured.

As a modified example of the above method, a method of manufacturing a coiled mat product will be described. First, supply the above-mentioned mixed cotton while rewinding it between the heating rollers.
After that, the coil-shaped mat product can be manufactured by treating it with the same method as the method for manufacturing the above-mentioned mat for manufacturing single plate-shaped boards and winding it on a roller. Finally, the process for producing the boards of the present invention is performed by using the above-mentioned mat for producing boards.

The method for producing the boards of the present invention is basically the same as the method for producing the mat of the present invention, except that a press molding step is added. That is, a method for producing a single-plate board by laminating a single-plate mat on a board having a desired size, specific gravity, thickness and the like,
The method is roughly classified into a method of forming boards into a desired shape (for example, a method of forming boards in a coil shape while winding a single-plate mat on a roller). FIG. 2 is a schematic diagram showing one of these methods, that is, a process for producing single-plate boards, and FIG. 3 is a schematic diagram showing the method, that is, a process for producing coil-shaped boards.

First, a method of manufacturing single plate boards will be described. The above-mentioned single plate mat is placed on an endless conveyor and laminated by a web cross layer into a board or sheet having a thickness according to a desired size, specific gravity, thickness and the like. The lamination method is not particularly limited,
It may be laminated as it is, or may be laminated after cutting the above mat to a required size.

Next, an adhesive is applied to this laminate. As the adhesive used in this step, all the adhesives used in the present invention are used, but it is recommended to use a thermosetting resin in order to increase the strength of the boards. It is also useful to use the above adhesive coating method to further increase the strength of the boards. Further, the method and the site for applying the adhesive are the same as the method used for producing the mat of the present invention. Alternatively, in addition to the adhesive, a preservative, an antifungal agent, an anti-inflammatory agent or the like may be added.

While the mat to which the adhesive is added is press-molded in this manner, the adhesive is solidified or cured.
As a method of press molding, for example, after cold pressing the mat to increase the specific gravity and molding, heated air,
Examples of the method include hot pressing with steam or heat from a hot platen press. The heating temperature during hot pressing is preferably selected appropriately according to the type of adhesive used,
For example, when a phenol resin and an epoxy resin are used as the thermosetting resin, it is preferably 120 ° C. or higher, a urea resin is 110 ° C. or higher, and a melamine resin is 115 ° C. or higher. After heating to a predetermined temperature according to the type of adhesive in this way, it is compressed to a desired board thickness by a hot plate press and held for a certain period of time to obtain a single-plate board. .

The hot pressing method will be described in detail below.
When compressing pressure is applied by the hot platen press, a spacer having the same thickness as the boards is placed on the hot platen so that the desired thickness of the boards is obtained. Next, when the temperature is raised to a predetermined temperature and kept for a certain time under a predetermined compression condition, the adhesive is hardened or solidified. At this time, the specific gravity of the boards can be changed by appropriately changing the compression pressure. As described above, the method for producing boards of the present invention is to change the strength of the boards by changing the content of long fibers, the kind or addition amount of adhesive, or the pressure during press molding. You can

As a modification of the above method, a method of manufacturing coiled boards will be described. First, the single plate-shaped mat is sandwiched between heating rollers and fed while being rewound, and then press-molded by the same manufacturing method as the above-mentioned single-plate-shaped boards, and then wound on a roller to form a coil. Boards can be manufactured.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto, and any modification or implementation is possible within the scope not departing from the gist of the preceding and the following. It is included in the technical scope.

[0043]

【Example】

Example 1 Paper cotton obtained by dry defibrating paper with a dry defibrating device was mixed with various long fibers (linen wool, soft fluff and cotton fluff) shown in Table 1 at a predetermined ratio. Then, a thermosetting resin (melamine resin) was added and cold pressing and hot pressing were performed to manufacture a board (specific gravity 0.1). The flexural modulus (kg / mm ² ) of the obtained board was measured and is shown in Table 1 as well as in graph form in FIG.

[0044]

[Table 1]

As is clear from Table 1 and FIG. 4, when the mixing ratio of the long fibers is in the range of 10 to 40%, good bending elastic modulus can be obtained, and the mixing ratio is increased. , The degree has also grown. Although not shown in the table, when the mixing ratio of the above long fibers was 5%, the flexural modulus was lower than that of 10%, but it was sufficient to fulfill the function as a board. It had elasticity.

Example 2 Hemp fiber was used as the long fiber material, and the hemp fiber mixing ratio was 10%.
%, And a board was prepared in the same manner as in Example 1. In addition, by changing the pressure of the spacer at the time of pressurization to change the compression pressure, the specific gravity of the obtained board is 0.7 to
It was changed in the range of 1.0. The flexural modulus (kg / mm ² ) and flexural strength (kg) of each board thus obtained
/ Mm ² ) was measured. The results are shown in Table 2.

[0047]

[Table 2]

As is clear from Table 2, the flexural modulus and flexural strength of the board of this example were both good, and these values also increased as the specific gravity increased.
From the results of Examples 1 and 2, it was confirmed that the strength and elastic modulus can be appropriately changed by appropriately changing the mixing ratio of the long fibers and the pressure during the compression step.

[0049]

EFFECTS OF THE INVENTION Since the boards and mat of the present invention have the above-mentioned constitution, they are excellent in economical efficiency, elasticity, lightness, etc., and in addition to cushioning materials and packaging materials, they are heat insulating materials for construction and soundproofing. Material,
It is intended to provide boards that can be used for boards and the like, that is, can be used in a wide range, and mats that can be used as materials for manufacturing the boards or can be used for the above-mentioned various purposes. Further, the mixed cotton material of the present invention is useful as a raw material for producing the boards and mats of the present invention. Further, since the method of the present invention has the above-mentioned structure, the boards of the present invention can be efficiently manufactured, and the shape thereof can be formed in a single plate shape or deformed into a coil shape or the like. it can.

[Brief description of drawings]

FIG. 1 is a schematic view showing a process for producing a mixed cotton product of the present invention.

FIG. 2 is a schematic view showing a step of forming the board of the present invention into a single plate shape.

FIG. 3 is a schematic view showing a step of forming the board of the present invention into a coil shape.

FIG. 4 is a graph showing the results of flexural modulus when the mixing ratio of long fibers was variously changed in Example 1.

[Explanation of symbols]

 1 Breast Hopper 2 Endless Conveyor 3 Mixing Roller 4 Auto Feeder 5 Random Free Spicker 6 Vertical Box

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[Procedure amendment]

[Submission date] June 23, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

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[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toshiki Segawa Inventor Toshinori Segawa 2-3-3, Niihama, Arai-cho, Takasago-shi, Hyogo Inside the Takasago Works, Kobe Steel, Ltd. (72) Yoshihito Kakihara Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture 2-3-1, Kobe Steel Works, Takasago Works (72) Inventor Jun Shimojo, 2-3-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Kobe Steel Works Takasago Works (72) Inventor Go Aimoto Hyogo 2-3-1, Niihama, Arai-cho, Takasago-shi, Kochi Kobe Steel Co., Ltd. Takasago Works

Claims (6)

[Claims] 1. Press-molding into a board or sheet containing paper cotton obtained by dry defibrating paper into a cotton shape, fibers having an average fiber length longer than the average fiber length of the paper cotton, and an adhesive. A board or sheet characterized in that it has been prepared. 2. A paper mat formed by dry defibrating paper into a cotton shape, and a fiber containing a fiber having an average fiber length longer than the average fiber length of the paper cotton. Characteristic mat. 3. The mat according to claim 2, which further contains an adhesive. 4. A mixed cotton product comprising paper cotton which is defibrated by dry defibrating paper, and fibers having an average fiber length longer than the average fiber length of the paper cotton. 5. The mixed cotton material according to claim 4, further comprising an adhesive. 6. An adhesive is used at an arbitrary time using a paper cotton obtained by dry defibrating paper into a cotton shape and a cotton mixed material containing fibers having an average fiber length longer than the average fiber length of the paper cotton. In addition, a method for producing a board or a sheet, characterized in that the adhesive is cured or solidified while being pressed to form a board or a sheet.