JP2003251613A - Platy recycled molded material using waste paper and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a platy recycled molded material capable of being substituted for a well-known card board and interior material by using waste paper and starch as raw materials and compressing and heating them without using water, adhesives and other binders. <P>SOLUTION: Cotton-like material to be obtained by dry fibrillation treatment of the waste paper and starch powder in an absolute dry state are mixed and cast into a mold. It is compacted and integrated by pressurizing to a specific draft and shaped in a plate shape by holding for a specific time in a heating atmosphere. Herein a content of starch powder is 1 to 10 wt.%, a pressurizing weight is 3 to 10 ton, a heating temperature is 100 to 150°C and a thickness of a molded plate is 1 to 30 mm. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycled molded product made from waste paper and other papers. More specifically, it is a cotton-like material obtained by dry defibration of waste paper and starch in a dry state (powder). body)
The present invention relates to a plate-shaped recycled molded product that uses waste paper as a raw material, which is mixed and consolidated without using an adhesive or other binder and shaped into a plate, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Heretofore, there have been some proposals for recycled products (generally molded products) such as cushioning materials using waste paper. For example, JP-A-52-130788 and JP-A-0
See 6-179469.

Under these circumstances, the present applicant previously found that a recycled material such as a cushioning material having excellent cushioning ability obtained by supplying water to a cotton-like material obtained by disintegrating waste paper to form a sponge-like material, and drying after molding. Have been proposed. [Patent No. 316847
No. 8; hereinafter, patented invention A. ]

Here, dried waste paper is mainly used, and a small amount of starch paste (paste material, that is, sizing material) is added and shaped in order to enhance the shape retention in the molding process. Therefore,
No adhesive or other binder is used as a raw material component.

Further, the inventors of the present invention relate to the recycling of fiber-containing materials such as waste paper, etc., and a dry-type defibrating device (including a coarse crushing device) for efficiently performing the crushing and defibrating of the fiber-containing materials. I have proposed. [Patent No. 3051981; Patent Invention B hereinafter. ]

According to this developed technique, the fiber-containing material can be crushed (crushed) into particles having a particle size (length in the case of flakes) of 1 mm or less and fibrillated to form a cotton-like material.

The inventors of the present invention have been continuously researching on the application development of the cotton-like material obtained by defibrating used paper by using the invention B, and the polyurethane foam obtained by crushing the cotton-like material and the crushed polyurethane foam. A waste material (micronized powder) was mixed, compressed and heated to develop a paper-polyurethane composite regenerated product. [Hereinafter, a regenerated molded product a. ]

Further, technical results regarding this recycled molded product (knowledge of availability of fine polyurethane powder)
From the background of the development of Patent Invention A, the starting material is only waste paper and starch powder in an absolutely dry state, and the mixture is mixed without using an adhesive or other binder, and heating and consolidation are performed.
I have tried to make a plate.

[0009] Here, it is said that a plate-shaped regenerated molded product having a molded plate thickness in the range of 1 to 30 mm is comparable in strength to or can be supplemented with known cardboard, and is superior in water absorbency. We have achieved results.

This is important because it does not require the use of paper stock, nor does it require a binder or water supply. It is well known that only cotton-like waste paper and starch powder (absolutely dry) are formed into a plate shape. This is a new material that can be used as a substitute for the thick paper.

[0011]

As described above, the direction of material development is the recycling technology of the fiber-containing material such as waste paper which the present inventors have obtained (the above-mentioned patent inventions A and B and the recycled molded article a). It is possible to combine papers (cotton-like material after defibration treatment) with polyurethane foam waste materials (micronized powders) and starch powders, and to develop new (composite) recycled molded products. There is expected. Here, only the cotton-like material of waste paper and the starch powder (absolutely dry) are formed into a plate shape to enhance the strength and water absorption, and the known cardboard can be replaced.

The present invention has been made in view of the above circumstances, and solves the above-mentioned problems and provides a paper (cotton-like material) that is defibrated by a dry method using a coarse crushing device and a defibration processing device. Provided are plate-shaped recycled molded products made from completely dried starch powder as a raw material, mixed and consolidated without using an adhesive or other binder, and using waste paper shaped into a plate, and a manufacturing method thereof. To do.

[0013]

In order to solve the problems, the present invention uses recycled paper and starch as raw materials in a recycled molded product using recycled paper and other papers without using water and adhesives and other binders. It is a plate-shaped recycled molded product, which is made by mixing a cotton-like product obtained by defibrating waste paper with a dry method and starch powder in an absolutely dry state, consolidating and integrating, and shaping into a plate shape. It is a feature.

Further, in the manufacturing method thereof, a cotton-like material obtained by defibrating waste paper by a dry method is mixed with starch powder in an absolutely dry state to prepare a regenerated raw material, which is put into a mold and then reduced to a predetermined amount. It is characterized in that it is pressed and integrated until it is consolidated, and is shaped into a plate by holding it in a heating atmosphere for a predetermined time.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

The regenerated molded product on a plate having the above-mentioned structure is made by mixing waste paper (cotton-like material) and starch powder (extra-dried), and after pressing into a mold, pressurizing to a predetermined reduction amount to consolidate and integrate the heating atmosphere. It is shaped into a plate by holding it for a predetermined time. In the production, the content of starch powder is 1
-10% by weight, pressurizing weight is 3-10 tons, heating temperature is 100-150 ° C, and molded plate thickness is 1-30 mm.

The obtained plate-shaped reclaimed product has the following properties. (1) It has an apparent specific gravity and / or hardness equivalent to that of known cardboard. (2) It has higher water absorption than known cardboard. (3) Does not contain an adhesive or other binder. (4) It has a non-directional structure.

Preferably, it is regenerated as a molded board having a plate thickness of 1 to 30 mm and can be used as a substitute for known cardboard and interior building materials.

A specific method for producing the plate-like regenerated molded product shown in Table 1 below will be described. It should be noted that although the numerical values are on an experimental scale, they do not affect the gist of the present invention.

By filling 1800 ml (65 g in weight) of recycled material at room temperature in a molding die having a length of 160 × width of 40 × depth of 250 [mm], and gradually reducing the pressure from the top using a pressure weight of 7 t as an index,
Compress while degassing. [Primary compression] During this period, the mold is heated to 100 to 150 ° C (preferably 110 to 130 ° C). As deaeration and heating proceed, the internal pressure of the material fluctuates, and the index of the weight 7t under pressure cannot be obtained. However, compression is performed while adjusting the pressure by jacking up until the plate thickness of the molded body becomes about 5 mm. [Secondary compression] After reaching a predetermined reduction amount, heating and holding is performed for 3 to 5 minutes. Then stop heating,
Let it cool. The plate-shaped regenerated molded product A thus obtained is
The hardness measured by a rubber hardness meter was 97.8. The measurement of the apparent specific gravity was omitted. The plate-shaped regenerated moldings B and C are also manufactured by the same method. These are shown in Table 1.

[0021]

[Table 1]

The contents (manufacturing conditions) shown in Table 1 are
As can be understood from the hardness index, it is intended to obtain the rigidity (or quasi-rigidity) that does not cause any problem in the practical strength of the plate-shaped recycled molded product.

[0023]

EFFECTS OF THE INVENTION The present invention has the above-mentioned constitution. According to this, paper (cotton-like material) after defibration treatment and starch powder (absolute dryness) are mixed, charged into a mold, and demolded. A rigid or quasi-rigid plate-like regenerated molded article having water absorbency can be obtained by performing hot compression molding after gas compression. Here, since it is not necessary to use water or an adhesive or other binder, there is no problem in environmental protection.

Further, the plate-like reclaimed product of the present invention is mostly waste paper (cotton-like product) by mixing a small amount of starch powder, and the press weight is optional within the range of 3 to 10 t, so that the hardness is The change of can also be selected. Of course, if the number of times of trial production is repeated, standard products having desired hardness (or apparent specific gravity) can be produced with high yield.

In particular, it can be used as a substitute material for known cardboard, cushioning material, electric material, building material (including interior material), various boards and other rigid materials or semi-rigid materials, and effective use of resources (waste materials). It is industrially beneficial in that it contributes to (recycle).

Claims (6)

[Claims] 1. A recycled molded product made from recycled paper or other paper, which is a plate-shaped recycled molded product made from recycled paper and starch without the use of water, an adhesive or other binder. A plate-shaped recycled molded product using waste paper, characterized in that a cotton-like material obtained by fiber treatment and starch powder in an absolutely dry state are mixed, consolidated, and shaped into a plate. 2. A recycled molded article made from waste paper or other paper, by mixing a cotton-like material obtained by dry defibration of waste paper with starch powder in an absolutely dry state, and adding the mixture until a predetermined reduction amount is reached. A plate-like recycled molded product obtained by shaping into a final shape by pressing and consolidating and holding for a predetermined time in a heating atmosphere, and used recycled paper characterized by having the following properties Plate-shaped recycled molded product. (1) It has an apparent specific gravity and / or hardness equivalent to that of known cardboard. (2) It has higher water absorption than known cardboard. (3) Does not contain an adhesive or other binder. (4) It has a non-directional structure. 3. The content of starch powder is 1 to 10% by weight.
A plate-like recycled molded product using the used paper according to claim 1 or 2. 4. A plate-shaped recycled molded product using the used paper according to claim 1 or 2, wherein the molded plate has a thickness of 1 to 30 mm. 5. A method for producing a reclaimed molded product made from recycled paper and starch, which is a recycled molded product made from recycled paper or other paper, without the use of water, adhesives or other binders. Mix the cotton-like material obtained by dry defibration with the starch powder in an absolutely dry state, put in a mold, pressurize to a predetermined reduction amount to consolidate and hold for a predetermined time in a heating atmosphere. A method for producing a plate-shaped recycled molded product using waste paper, which is characterized in that it is shaped into a plate by means of a method described above. 6. The content of starch powder is 1 to 10% by weight.
The pressurizing weight is 3 to 10 tons, and the heating temperature is 1
The method for producing a plate-shaped recycled molded product using waste paper according to claim 5, which has a molding plate thickness of 1 to 30 mm and a temperature of 00 to 150 ° C.