JPH0613056B2 - Method for producing intermediate product from papermaking sludge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing an intermediate product, which utilizes a papermaking sludge discharged from a papermaking factory or the like and uses this as a raw material to produce an intermediate product. The papermaking sludge in this specification includes so-called pulp sludge discharged during the papermaking process, in addition to so-called papermaking sludge which is the final residue of the papermaking process.

(Object of the Invention) Various methods have heretofore been proposed in order to effectively utilize papermaking sludge discharged from a papermaking factory or the like. However, if the papermaking sludge or the like is agitated and kneaded as it is, the kneaded product is likely to be entangled with each other to form an uneven lump,
Therefore, it is difficult to separate them from each other to form a granular material.

Further, a product obtained by molding a granular material obtained by simply granulating papermaking sludge or the like is likely to have a relatively high density, and therefore, bulkiness, flexibility, sound absorption, etc. are required depending on the use site. It was inconvenient for the construction board etc. The present invention has been made in view of such an actual situation, and first of all, the first object of the present invention is to easily form a particulate matter from a papermaking sludge that has been conventionally landfilled by digging a hole in a mountain or the like. At the same time, by effectively utilizing this, an intermediate product that is convenient for handling and storage can be easily produced, and furthermore, various products such as building materials can be easily produced by using this intermediate product. An object of the present invention is to provide a method for producing an intermediate product using a papermaking sludge as a raw material.

A second object of the present invention is to provide, in addition to the first object, a method for producing an intermediate product which is particularly suitable for producing a product such as a board which is bulky and has flexibility on the surface and a product such as a sound absorbing material. To do.

(Structure of the Invention) In order to achieve the first object, the first invention of the present application is to add sawdust to the papermaking sludge, knead with stirring, and extrude the kneaded product, and then roll, extrude or crush it. It is formed into a granular shape by a mechanical granulation operation such as.

Further, the second invention of this application, in order to achieve the second object in addition to the first object, by adding sawdust to the papermaking sludge and kneading with stirring, after extruding the kneaded product, rolling Then, the flakes are formed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 is a concrete form of the first invention of this application. In this embodiment, several types of papermaking sludges having different water contents are mixed in the first step, and sawdust, etc. The additives are mixed and kneaded by using a mixer (1) or the like so as to obtain a homogeneous state. In this case, since sawdust is added to the papermaking sludge, even if the papermaking sludge itself is a fibrous material that is easily entangled, the papermaking sludge is separated without being entangled due to the interposition of sawdust. As a result, the kneaded product is easily formed into particles. As the sawdust, it is advisable to employ one that is produced secondarily from a factory that uses wood as a raw material, such as a sawmill. As the papermaking sludge, it is desirable to knead various materials having different water contents discharged from a paper manufacturing plant or the like to prepare a kneaded product having a water content of about 65%. Further, for stirring and kneading, iron balls or the like may be used to carry out stirring and kneading by utilizing the principle of a ball mill.

In this way, the granular kneaded material that is homogenized by stirring and kneading to adjust the water content has sawdust added, and therefore is further extruded through the extruder (2) in the next step and extruded through the extrusion port, and then the next step. In the process, it is put into a granulating machine (3) such as a tumbling type, an extrusion molding type or a crushing type, and tumbled, extruded or crushed to easily separate and solidify into particles. And
As a result, granular materials are efficiently formed. This granular material has a water content of about 30 to 40% and a size of about 1 to 10 mm.

Then, this granular material is passed through a sieve (4) in the next step, and while being sieved into several types according to its size, it is passed through a dryer (5) in the next step and dried in the dryer (5). Into a granular intermediate product.

Since the intermediate product produced in this manner is in the form of particles, it can be easily handled and stored, and
Even when a building material such as a plate or a pillar is made from this intermediate product, since it is granular, the adhesive effectively adheres to the surface of each granular material, and the manufacturing process can be easily performed. In addition to the building materials, this granular intermediate product is used, for example, as a core of bran or tatami, is mixed with a fiber-coated wall, and is mixed with a material of gypsum board or pottery. It can be used for various purposes such as

Next, an embodiment of the second invention of this application will be described with reference to FIG. 2. In this embodiment as well, as with the embodiment of FIG. Stirring and kneading of sawdust added to this, extruder
Extrusion of the kneaded product according to (2), rolling, extrusion or pulverization of the extruded product with the granulator (3) is performed, and the kneaded products are easily separated without being entangled with each other to form a large number of granules.

Then, in this embodiment, the granular material is applied to the nip roller (6) in the next step, and is rolled into a flake by the nip roller (6).

Then, the flaky material is dried by the dryer (5) in the next step to form a flaky intermediate product.

In addition, in this embodiment, after being once formed into particles,
Although it is rolled and formed into flakes over the nip roller (6), even if the kneaded product extruded from the extruder (2) is rolled directly over the nip roller (6) as shown by the chain line in FIG. The objects can be separated and solidified into flakes to form a large number of flakes.

Since the intermediate product produced in this way is in the form of flakes, like the above-mentioned granular intermediate product,
Not only is it easy to handle and store, but it can also be applied to various uses such as building materials and can be easily manufactured and processed.

Also, since this intermediate product is in the form of flakes, when it is molded to make a board, voids are likely to occur, and therefore,
In particular, it is suitable for the production of bulky boards and boards whose surface requires flexibility, and is also optimal for the production of sound absorbing materials.

In addition to each of the above-described embodiments, the present invention mixes a small amount of additives such as starch paste, CMC, caustic soda, and thermoplastic adhesive to the papermaking sludge in the first stirring and kneading step. For example, the present invention can be embodied by being arbitrarily modified without departing from the spirit of the present invention.

(Effects of the Invention) As described in detail above, the first invention of this application is such that mechanical processing such as rolling, extrusion, or crushing is performed after adding sawdust to papermaking sludge, stirring and kneading, and extruding the kneaded product. Since the kneading operation is carried out, the kneaded products can be easily separated without being entangled with each other, whereby the granulated products can be efficiently formed. This makes it possible to effectively use the papermaking sludge that has been conventionally landfilled by digging holes in mountains, etc., and easily produce an intermediate product that is convenient for handling and storage. This has an excellent effect that various products such as building materials can be easily manufactured by using the objects.

In addition, the second invention of this application is such that sawdust is added to the papermaking sludge, the mixture is stirred and kneaded, and the kneaded product is extruded and then rolled to form flakes. In particular, it is possible to obtain an intermediate product suitable for producing a product such as a board and a sound absorbing material, which is sublime and has flexibility on the surface.

[Brief description of drawings]

FIG. 1 is a block diagram showing a production process of a granular intermediate product embodying the first invention of this application, and FIG. 2 is a block diagram showing a production process of a flaky intermediate product also embodying the second invention. Is. Explanation of code 1 …… Mixer, 2 …… Extruder, 3 …… Granulator, 6 …… Nip roller.

Claims (2)

[Claims] 1. A papermaking sludge characterized by adding sawdust to a papermaking sludge, stirring and kneading the mixture, extruding the kneaded product, and then forming the kneaded product into granules by a mechanical granulation operation such as rolling, extrusion or crushing. The manufacturing method of the intermediate product which uses as a raw material. 2. A method for producing an intermediate product using a papermaking sludge as a raw material, which comprises adding sawdust to a papermaking sludge, stirring and kneading the mixture, extruding the kneaded product, and then rolling the mixture into flakes. .