JP2912109B2 - Buffer material using waste paper, method of manufacturing the same, and manufacturing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material using waste paper, a method for producing the same, and a production apparatus.

[0002]

2. Description of the Related Art A method of recovering and recycling waste paper and reusing it has been established. However, the capital investment amount of recovery and recycling of waste paper is high, and a system for recovering and recycling all waste paper has not yet been established. Is the actual situation. Furthermore, various types of functional papers are widely used, and among them, there are many varieties that cannot be recovered and regenerated. As a conventional method of manufacturing a cushioning material using waste paper, a pulp molding method has been proposed and used.However, this method requires a large-scale production equipment, requires a large investment, requires a large amount of water, and requires drainage. There is a concern that secondary pollution may occur due to the release, and its location is limited for its disposal, and it requires a large investment, which is not suitable for distributed small-scale manufacturing. Further, the cushioning material obtained by the pulp molding method has a limitation in wall thickness and is unsuitable as a cushioning material for heavy objects, and has a specific gravity higher than that of polystyrene foam, so that its use is limited. As another method, a method of making a three-dimensional shape by cutting and combining cardboard is used, but the cushioning material by this method cannot be automated, the cost is high, and it is not suitable for mass production. Has the disadvantage of becoming longer. Furthermore, it has the disadvantage that the elasticity is insufficient and the cushioning property is weak.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances.
An object of the present invention is to provide a cushioning material using waste paper, which is capable of efficiently aggregating waste paper, and has elasticity and can be formed into a desired shape, a manufacturing method thereof, and a cushioning material.

[0004]

In order to solve the above problems, in the invention of claim 1, waste paper containing at least 10 to 30% of groundwood waste paper and at least 30% of unbleached kraft waste paper is used. The waste paper was mixed and defibrated in a dry state, water and an elastic adhesive were added to the defibrated waste paper, and a rotational force or vibration was applied thereto to aggregate the defibrated waste paper, and thus obtained. Technical measures are taken such that a large number of aggregates are mixed with an adhesive to adhere the aggregates to each other, and then dried after bonding. A buffering material utilizing waste paper. Also,
In the invention of claim 2, a waste paper comprising at least 10 to 30% of ground wood waste paper and unbleached kraft waste paper of 30% or more is used, and the waste paper is mixed and defibrated in a dry state; A process of adding water and an elastic adhesive to the laid waste paper, a process of applying rotational force or vibration to these to agglomerate the defibrated waste paper, and forming a large number of aggregates thus obtained into a mold. , And a step of adhering the aggregates by mixing an adhesive, and a step of drying after bonding. Further, in the invention of claim 3, at least 10 to 30% of groundwood waste paper is used.
Using a waste paper containing 30% or more of unbleached kraft waste paper and mixing and defibrating the waste paper in a dry state; adding water and an elastic adhesive to the defibrated waste paper; Agglomeration device that aggregates the defibrated waste paper by applying force or vibration, and mixes the adhesive with a large number of aggregates obtained in this way, molds them, applies light pressure, and shapes them after shaping Technical measures are taken to consist of a punching die device.

[0007]

Function: At least groundwood waste paper 10 to 3
A waste paper containing 0% and an unbleached kraft waste paper of 30% or more is fibrillated, mixed with an elastic adhesive and rounded into a spherical shape, so that a highly elastic aggregate can be produced efficiently.
Further, depending on the application, the aggregates are adhered to each other with a water-soluble or water-insoluble adhesive to form a desired shape, thereby obtaining a cushioning material rich in elasticity. When the buffer material obtained by this method using a water-soluble adhesive is recovered and reused, it can be returned to the aggregated state by immersing it in a small amount of water. Can be manufactured. If you do not like water absorption or moisture absorption, this can be achieved by using a water-insoluble adhesive or molding using a water-soluble adhesive, and then applying a water-repellent or waterproof coating or coating on the surface. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the case where the cushioning material is manufactured in the present embodiment, the material waste paper is firstly cut by 1 to 10 cm ² by the cutting device 10.
Cut into small pieces. Cutting can be performed with a guillotine-type cutting machine or other cutting machine, crusher, chipper, or other crushing machine as long as the desired strip can be obtained efficiently, and the type of equipment limits the method of the present invention. Although not required, the inventor was able to efficiently obtain the target strip using the chipper.

[0009] Newspapers and weekly newspapers contain a lot of groundwood and generally have low strength. On the other hand, corrugated cardboard and kraft paper for packaging contain a large amount of unbleached kraft pulp and have high strength. As a result of studying the optimum blending ratio of these wastepapers, as shown in FIGS. 1 to 3, at least 10% of groundwood-based wastepaper and at least 30% of unbleached kraft-based wastepaper are required to efficiently promote agglomeration. I found what I needed to mix.

That is, in FIG. 1, when GP (ground wood waste paper) is 10%, it can be seen that the more unbleached kraft waste paper, the better the agglomeration. In FIG.
In the case of 20%, the more the unbleached kraft waste paper is increased, the better the agglomeration is. FIG.
In the case of GP 30%, as the amount of unbleached kraft waste paper increases, the agglomeration becomes better, however, it reaches a plateau from 35%.

As described above, groundwood waste paper has low strength, so blending 30% or more is not desirable because it causes a reduction in strength. When the unbleached kraft waste paper is less than 30%, the aggregation is hindered. However, when the content is more than 30%, the higher the blending ratio is, the more the effect of increasing the strength is obtained. If at least 10% of groundwood-based waste paper and 30% of unbleached kraft-based wastepaper are included, the other parts may be any wastepaper, but it is desirable that the groundwood-based wastepaper be kept within a range not to fall below the required strength.

The thus-obtained flakes are defibrated into fibers by the defibrating device 20. The method of defibration may be any method and equipment that can be defibrated in a dry state, but it is desirable to defibrate as much as possible without cutting the fiber. In this example, the fibers were broken using a hammer mill without cutting the fibers.

The defibrated waste paper fibers are uniformly mixed with a highly elastic emulsion adhesive as a preparation step for agglomeration. The emulsion adhesive is used by diluting an amount of 5 to 20 parts by weight with respect to the solid content in terms of the solid content according to the adhesive strength to a low concentration as necessary. If the compounding amount of the adhesive is 5 parts or less, the adhesive does not sufficiently reach between the fibers, the strength of the aggregates is insufficient, and the aggregates may collapse at the time of molding and give necessary elasticity to the molded product. It becomes difficult. On the other hand, if it exceeds 20 parts, the space between the fibers is too tightly restrained, the elasticity decreases, and the amount of heat generated at the time of incineration of waste increases, which may cause a trouble.

As the adhesive, an emulsion adhesive having a high elasticity such as a natural rubber emulsion, a synthetic rubber emulsion, and an emulsion of a synthetic resin-based elastomer is preferable. In consideration of the suitability at the time of disposal, the formation and elasticity of aggregates are considered. The most suitable is a natural rubber emulsion. Other adhesives used for agglomeration include solvent-type adhesives that have high elasticity during curing.However, since water is an essential element for agglomeration, the solvent used must be compatible with water. It is desirable to have one.

As the aggregating device 30, a cylindrical rotating container whose rotation axis can be adjusted to an arbitrary angle is used, and the defibrated paper is aggregated by rotating the rotation axis in an inclined state. It is preferable to provide a rotating blade for stirring in the cylindrical rotary container. In addition, the aggregating device 30 may be a device that applies vibration instead of rotating force. It is possible to narrow the particle size distribution range as much as possible by appropriately setting the conditions for agglomeration, but particles having a particle size of 5 mm or less or 20 mm or more may be generated. Therefore, the aggregates thus obtained are sieved to separate and remove those having a particle size of 5 mm or less and 20 mm or more. As a whole, the particle size is 1 to 3
Although it has a distribution in the range of about 0 mm, it is not preferable to mix a large amount of particles having a particle size of about 5 mm or less as shown in FIG. 6 because the elasticity after shaping is reduced.

Further, the one having a particle diameter of 20 mm or more (large-diameter aggregate 1) as shown in FIG. 4 is not preferable because the strength of a molded product is reduced. Therefore, as shown in FIG.
A small amount of 5 mm for a particle size of about 0 mm (medium diameter aggregate 2)
A good result is obtained by blending particles having the following particle size (small diameter aggregates 3). Excessive particles having a particle size of 5 mm or less may be mixed with the raw material in the agglomeration step again and used, and particles having a particle size of 20 mm or more may be re-ground to reduce the particle size.

Classifications of 5 mm or more and 20 mm or less are further classified into large, medium, and small tertiary grades and subjected to the next molding. It is necessary to mix each classification according to the design dimensions of the molded article as described later in order to ensure strength and elasticity. The use of large-diameter aggregates increases the voids between the aggregates and increases the elasticity of the molded product, but the cross-sectional size is small and the number of aggregates included in the range of the cross-sectional size decreases as shown in FIG. Since the adhesion between the aggregates is close to the point adhesion, the adhesive strength between the aggregates is reduced, and as a result, the required strength of the molded product cannot be maintained. Therefore, it is necessary to determine the aggregate particle size distribution within the required strength range of the molded article.

The adhesive is uniformly mixed with the aggregates thus mixed so as to have an appropriate particle size distribution. In this case, the adhesive is desirably added at a concentration and viscosity as high as possible. At low concentrations, not only does the solvent of the adhesive, generally water, penetrate into the aggregates and have the adverse effect of deforming or destroying the aggregates, but if more than a predetermined amount of adhesive is used, more water than necessary is required. And the drying energy is increased. If the viscosity is low, the adhesive fills between the aggregates, impeding elasticity, and the initial bonding strength between the aggregates is low, so not only can it not be released from the mold, but also the adhesion between aggregates And the strength of the molded article is reduced. It is preferable to select an adhesive concentration of at least 10% or more and a viscosity in that case exceeding 200 poise.

The aggregate to which the adhesive has been added is mixed with a mold device 40.
And molded under light pressure, demolded and dried. The packing amount of the aggregate is 1.5 to 2.
Five times gives good results. As the amount of mold filling increases, the strength increases but the elasticity decreases. Therefore, an appropriate point satisfying both of the two tradeoffs is 1.5 to 2.5 times.

[0020]

Example 1 Weekly magazine (ground wood type) waste paper, corrugated cardboard (unbleached kraft type) waste paper, and other miscellaneous waste paper (OA paper waste paper) were crushed to about 2 cm square using a chipper and further broken up with a hammer mill. After delicate, weekly magazine (ground wood type) 20% waste paper, cardboard (unbleached craft type)
30% of waste paper and 50% of other miscellaneous waste paper (OA paper waste paper) are mixed, and a 10% solution of natural rubber emulsion is added in an amount equal to the weight of the fiber. For 5 minutes to form aggregates, then sieving the aggregates, 5 mm or less, 5 to 10 mm, 10 to 1
Classify into 5mm, 15-20mm, 20mm or more,
Classifications of 5 mm or less and 20 mm or more were removed. 5mm
3 kinds of aggregates as shown in Table 1 were prepared for each classification of 10 to 10 mm, 10 to 15 mm, and 15 to 20 mm, and a 10% solution of oxidized starch was added to each of them at a weight ratio of 200% of the total weight of the aggregates. After compression molding to 1.5 times the apparent volume, dry at 100 ° C for 10 minutes, and cool
The strength was measured by a conventional method, and the results shown in Table 1 were obtained.

[0021]

[0022]

Example 2 200% of a 10% solution of polyvinyl alcohol was added to aggregates having the same composition as in Example 1 and compression molding was performed to reduce the apparent capacity by half. Could not be molded.

[0023]

According to the present invention, waste paper can be efficiently aggregated, and the cushioning material obtained by the present invention is:
It has the same cushioning property as the cushioning material of polystyrene foam which has been widely used in the past, and the strength properties can be adjusted by selecting the particle size distribution of aggregates as needed. Further, there is no generation and emission of polluted wastewater in the manufacturing process, and there is no danger of environmental pollution as in the pulp mold method. In the case of incineration disposal, since it itself has a low calorific value and can prevent damage or wear of the incinerator, no problem occurs even if it is collected and treated as general garbage. Moreover, even if the waste is left to be discarded, it is easily disintegrated into aggregates by rainfall, and returns to nature by the action of microorganisms with the passage of time, so that soil contamination does not occur. The effect of the present invention is that the material of this buffer material is not only a recycled material, but also by simply establishing a systematic recovery system, it can be easily reduced to a state of aggregate and formed again for another purpose, and then re-used. The effect can be further exhibited where it can be used.

[Brief description of the drawings]

FIG. 1 is a diagram showing the relationship between the raw material composition and the aggregate size distribution.

FIG. 2 is a diagram showing the relationship between the raw material composition and the aggregate size distribution.

FIG. 3 is a graph showing the relationship between the raw material composition and the aggregate size distribution.

FIG. 4 is a schematic view of a molded product made of only large-diameter aggregates.

FIG. 5 is a schematic view of a molded product obtained by appropriately mixing medium-diameter aggregates and small-diameter aggregates.

FIG. 6 is a schematic view of a molded product obtained by mixing small-diameter aggregates at a high ratio.

FIG. 7 is a block diagram showing a cushioning material manufacturing apparatus.

[Explanation of symbols]

 1 Large diameter aggregate 2 Medium diameter aggregate 3 Small diameter aggregate

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B31B 1/00-49/00 B31C 1/00-13/00 B31D 1/00-5/04 B65D 5/00-5 / 76 B65D 57/00-59/08 B65D 81/00-81/16 B65D 67/00-79/02 B65D 81/18-81/30 B65D 81/38 B65D 85/00-85/84 B27N 1/00 -9/00 D21B 1/00-13/12 D12H 1/00-3/82 D21H 5/00-5/26 D21C 1/00-11/14 D21D 1/00-5/28 D21F 1/00-13 / 12 D21G 1/00-9/00 D21J 1/00-7/00

Claims (3)

(57) [Claims] 1. At least groundwood waste paper 10.
Using 30% or more and 30% or more of unbleached kraft waste paper, the waste paper is mixed and defibrated in a dry state, and water and an elastic adhesive are added to the defibrated waste paper to obtain a rotational force. Alternatively, the defibrated waste paper is agglomerated by applying vibration, a large number of the obtained agglomerates are mixed with an adhesive to bond the agglomerates together, and dried after the bonding. Use cushioning material. 2. At least groundwood-based waste paper 10
Mixing and defibrating the waste paper in a dry state using waste paper containing from 30% to 30% and unbleached kraft waste paper, and adding water and an elastic adhesive to the defibrated waste paper And a process of applying rotational force or vibration thereto to agglomerate the defibrated waste paper; putting a large number of the aggregates thus obtained in a mold, mixing an adhesive and bonding the aggregates to each other A method for producing a buffer material using waste paper, comprising: a step of drying after bonding. 3. At least groundwood-based waste paper 10.
A defibration device that mixes and defibrates the waste paper in a dry state using waste paper containing from 30% to 30% and unbleached kraft waste paper, and adding water and an elastic adhesive to the defibrated waste paper And
An aggregating device that aggregates the defibrated waste paper by applying a rotating force or vibration, and an adhesive is mixed with a large number of aggregates obtained in this way, and the resulting mixture is molded and then lightly pressed to form An apparatus for manufacturing a cushioning material using waste paper, characterized by comprising a die device for die cutting.