JP2000229312A - Manufacture of container made of biodegradable material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an environmental pollution when disposed while incorporating mechanical properties such as a sufficient strength when used by heating and pressing mixed powder obtained by uniformly mixing powder of plant material containing hull as a main component with powder of biodegradable properties containing a binder and compression molding it. SOLUTION: A plant material containing hull as a main component is selected (step (S) 10), and comminuted (S11) to form a plant material powder (S12). Then, a biodegradable containing a substance to become a binder such as gelatin, starch or the like is selected (S13), and comminuted (S14) to form a biodegradable powder (S15). The plant material powder and the biodegradable material powder are uniformly mixed at a predetermined ratio by a mixer or the like to form a mixed material powder (S16). A load is applied to the powder by a molding machine, and the powder is compression molded by heating and pressing (S17) to a container of a predetermined thickness (S18). Thus, the container holds a strength as the container and mechanical properties such as shape retentivity or the like, can be decomposed by a microorganism, a sun light or an ultraviolet ray, and transformed to soil, thereby eliminating incinerating, recycling or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a container made of a biodegradable material, which is composed of a plant material mainly composed of rice husks.

[0002]

2. Description of the Related Art Heretofore, there has been known a disposable container made of a material obtained by adding straw or the like to a foamed styrene-based synthetic resin (for example, Japanese Patent Application Laid-Open No. H8-14369).
No. 5, JP-A-8-151027).

[0003] The biodegradable molding material disclosed in Japanese Patent Application Laid-Open No. 10-323810 comprises 51 to 70 wt% of paper powder and 30 to 49 wt% of a biodegradable aliphatic polyester resin, and has a heat resistant temperature. A vegetation pot that can be transplanted into the soil can be formed for each pot such as disposable dishes, trays, and seedlings that are expensive and can be sterilized with steam. The biodegradable molding material is
It is water-resistant, and when it is disposed after use, it collapses and disappears within a certain period of time.

[0004] Japanese Patent Application Laid-Open No. 7-205120 discloses a method for producing a degradable container. The method of manufacturing the degradable container is to use cereal straw and rice husk as a basic raw material so as not to cause environmental pollution due to disposal, sterilize the cereal straw and rice husk by high-temperature sterilization, and after drying, cut fibers or crushed in advance. In the meantime, the hydrated starch is heated to gelatinize, and the mixed material obtained by mixing and stirring the both is heated and pressed by a die, and then a plastic film is applied to form a cover layer.

[0005]

However, conventional disposable containers contain a small amount of non-biodegradable resin material in order to improve the fluidity during molding. Will cause. Further, the conventional degradable container has a drawback in that it does not have sufficient mechanical properties such as rigidity, strength, shape retention and the like when used. Further, the molded article produced by the method for producing a decomposable container can maintain its shape only by providing a cover layer.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to uniformly mix raw material powder obtained by crushing a plant raw material and a biodegradable substance, and compress the raw material powder by heating and pressing. This is a method for easily manufacturing containers by molding. After the composition of the molded container is disposed of, the container material can help the microorganisms decompose in a short period of time,
Biodegradable, broken down by ultraviolet rays and the like, decomposed into harmless soil, and the decomposed substances can be used as soil amendments, and have excellent mechanical properties such as rigidity, strength and shape retention during use. An object of the present invention is to provide a method for manufacturing a material container.

The present invention provides a process for producing a mixed raw material powder in which a plant raw material powder obtained by crushing a plant raw material containing rice hulls as a main component and a biodegradable raw material powder obtained by crushing a biodegradable substance containing a binder are uniformly mixed. And a step of compression-molding the mixed raw material powder into a container by applying heat and pressure to the container.

[0008] Water is added to the mixed raw material powder depending on the raw material.

The plant raw material powder and the biodegradable raw material powder are crushed powders each crushed to 50 to 300 mesh.

The conditions for the compression molding of the mixed raw material powder by heating and pressing are as follows: a temperature of 100 to 200 ° C .;
kg / cm ² and the molding time are set in the range of 3 to 30 seconds.

[0011] The thickness of the container formed by compression molding of the mixed raw material powder is 0.5 mm or more. Further, the container formed by compression molding of the mixed raw material powder may be a flat plate, but preferably has an inclination angle of 15 ° or more.

[0012] The mixed raw material powder may be any of the plant raw materials 60 to
90% and 10 to 40% of the biodegradable substance.

[0013] The plant material may contain plant fibers such as straw and pulp. That is, as a plant raw material, it can be composed only of rice husk, but in some cases,
Plant fibers such as straw and pulp may be blended.

The biodegradable substance is rosin, dammer,
Copal, gelatin, starch, shellac, calcium carbonate, biodegradable plastics (for example, brand name Bionole) or a mixed powder thereof. Among these, the material that functions as a binder is rosin, dammer, copal, gelatin, starch, shellac, or a mixed powder thereof.

The mixed raw material powder contains an oxidizing preservative and / or
Or a bleach is mixed.

As the rice hulls, rice husks separated from brown rice by rubbing dry rice husks can be used. Therefore,
The rice husk used here does not need to be washed or dried and disinfected, and can be sufficiently sterilized at the time of heat molding of the mixed material. Thereafter, it may be handled in the same manner as ordinary tableware.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a container made of a biodegradable material according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a container manufacturing process in a method for manufacturing a container made of a biodegradable material according to the present invention, and FIG.
FIG. 2 is an explanatory view of a manufacturing apparatus used in the method for manufacturing a container made of a biodegradable material according to the present invention.

The container produced by the method for producing a container made of a biodegradable material according to the present invention includes tableware, a container, a box for packaging,
It can be used for cans, bags, etc., as well as containers for plant cultivation such as flowerpots and vegetation pots. It is composed of a mixed raw material powder in which 10 to 40% of a decomposable substance is mixed, and depending on the raw material, is composed of a mixed material to which moisture is added. The material of the main raw material constituting the container is broken down by microorganisms or broken down by sunlight, ultraviolet rays, etc., and converted into harmless soil.

The method for producing the container made of the biodegradable material comprises the steps of:
A process of preparing a mixed raw material powder by uniformly mixing a biodegradable raw material powder obtained by pulverizing a biodegradable material containing a binder, and a step of compression-molding the mixed raw material powder into a container by heating and pressing the mixed raw material powder with a press. ing. First, a plant raw material mainly including rice hulls is selected (step 10), and the selected plant raw material is crushed to 50 to 300 mesh by a crusher or the like (step 11) to produce a plant raw material powder (step 12). On the other hand, a biodegradable substance containing a binder is selected (step 13), and the selected biodegradable substance is pulverized to 50 to 300 mesh with a pulverizer or the like (step 14) to produce a biodegradable raw material powder (step 15). ).

Next, the plant raw material powder and the biodegradable raw material powder are blended in a predetermined ratio, and uniformly mixed with a mixer or the like to produce a mixed raw material powder (step 16). At this time, the mixture ratio of the biodegradable raw material powder and the biodegradable raw material powder is 60 to 90% of a plant raw material and 10 to 40% of a biodegradable substance in view of shape retention. Preferably,
It is preferable to comprise 65 to 85% of a plant material and 15 to 35% of a biodegradable substance.

When the mixed raw material powder is heated and pressurized by a molding apparatus to perform compression molding, a predetermined amount of water may be added depending on the raw material selected for producing the mixed raw material powder. At this time, depending on the selected material, there is, of course, no need to add water. Then,
The mixed raw material powder is filled between the upper die 2 and the lower die 3 using a predetermined molding device, for example, a molding device as shown in FIG. Heater 4 provided
, The press 5 is operated to apply a load P, and the mixed raw material powder is compression-molded by heating and pressing (step 17). At this time, the molding apparatus is configured such that the molding temperature is 100 to 200 ° C. and the molding pressure is 20 to 8
It is preferable to set the pressure so as to be in a range of 0 kg / cm ² and a molding time of 3 to 30 seconds. The thickness of the container formed by compression molding of the mixed raw material powder can be variously set, but it is preferable to form the container to a thickness of 0.5 mm or more, for example, to maintain the strength and shape of the container. This is preferable from the viewpoint of the mechanical properties of (Step 18).

The container formed by compression molding of the mixed raw material powder can be made into a flat plate, but when used as tableware, its inclination angle is, for example, 15 °.
It is preferable to mold the above.

[0023] The plant raw materials may be mixed with plant fibers such as straw and pulp in addition to rice husks. That is, as a plant material, it can be composed only of rice husk,
In some cases, plant fibers such as straw and pulp may be blended.

As the biodegradable substance, rosin, dammer (also called dammar, which is a natural resin), copal (which is a natural resin), gelatin, starch, shellac, biodegradable plastic, or a mixed powder thereof is used. be able to. Among them, rosin, dammer, copal, gelatin, starch and shellac function as binders. Further, an oxidative preservative and / or a bleaching agent can be mixed with the mixed raw material composed of the plant raw material and the biodegradable raw material. As the chaff, chaff separated from brown rice by rubbing of dried chaff can be used, and in this case, a step of separately drying the chaff can be omitted.

The plant raw material such as rice hulls constitutes the bulking agent constituting the container, is biodegradable, and is 60-90%, preferably 65-8%, for cost reduction.
It can be contained as much as 5%.

Calcium carbonate contained in a container made of a biodegradable material has spontaneous disintegration and can reduce the cost, improve the heat resistance of the container and increase the hardness. There is a limit to the amount to be added because the fluidity deteriorates.

As the biodegradable plastic, biodegradable aliphatic polyester and aliphatic polyether can be used. For example, polycondensation of a polyol such as 1,4-butanediol and a dicarboxylic acid such as succinic acid and adipic acid can be used. There is an aliphatic polyester (Bionore trade name) obtained by the reaction. Aliphatic polyesters are biodegradable substances, but are expensive, so the amount used is limited to reduce costs.

Shellac is a kind of natural resin and has thermosetting properties. It is naturally degraded and biodegradable. Here, it is usually used as a powder for uniform mixing with plant materials. . Shellac can be used as a liquid because it can be dissolved in alcohol and melted by heat, and can be made into an alcohol solution (25 to 50%) or an aqueous solution (25%).

Rosin is a natural resin and is naturally disintegrating, but has low bonding strength and low heat resistance.
In use, it is necessary to consider heat resistance.

Gelatin is a kind of animal protein,
Although it is biodegradable, it has characteristics of low bonding strength and heat resistance. Therefore, it is necessary to consider the bonding strength and heat resistance in use.

Starch is biodegradable and can be obtained at low cost in terms of cost. However, since it has characteristics of low bonding strength and heat resistance, it is necessary to consider the bonding strength and heat resistance in use. is there.

As a first specific example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material and the biodegradable substance is determined by mixing rice hulls 80 as a plant raw material.
% And starch 20% as a biodegradable substance.

As a second specific example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material to the biodegradable substance is determined by the following method.
%, Starch as a biodegradable substance 20%, and calcium carbonate 10%.

As a third specific example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material and the biodegradable substance is determined by mixing rice hulls 80 as a plant raw material.
% And 20% of shellac as a biodegradable substance.

As a fourth specific example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material to the biodegradable substance is determined by the following method.
% And 5% of shellac as a biodegradable substance. The shellac used here is a shellac solution dissolved in alcohol and used by coating the surface of the rice hull compact.

As a fifth specific example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material and the biodegradable substance is determined by the following method.
% And rosin 20% as a biodegradable substance.

As a sixth specific example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material and the biodegradable substance is determined by using a rice hull 80 as a plant raw material.
% And 20% of gelatin as a biodegradable substance.

As a seventh concrete example of the raw material used in the method of manufacturing a container made of the biodegradable material, the mixing ratio of the plant raw material and the biodegradable substance is set to 70% as the plant raw material.
% And aliphatic polyester 20% as a biodegradable substance
And 10% of a material such as calcium carbonate containing a binder.

[0039]

The method for manufacturing a container made of a biodegradable material according to the present invention is constituted as described above, so that in a very simple manufacturing process, the biodegradable material containing rice husk as a main component and a binder is used. Containers can be manufactured. In addition, the container manufactured as described above can be used as tableware, a tableware tray, a vegetation pot, a container for storing various materials, and the like. Even if the container itself is left or discarded after functioning as a container, The material itself that constitutes the container can be biodegraded by microorganisms or converted into harmless soil that can be returned to the soil after it has been destroyed by sunlight, especially ultraviolet light, so there is no need to incinerate or recycle it, and these treatments can be omitted. It can be used as a soil conditioner for agricultural products. Further, the container manufactured by this manufacturing method has the above-described function while the container itself is at the same price as the market price, so that an extremely inexpensive container can be provided as a whole.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a manufacturing process of a container in a method of manufacturing a container made of a biodegradable material according to the present invention.

FIG. 2 is an explanatory view of a manufacturing apparatus used in the method for manufacturing a container made of a biodegradable material according to the present invention.

[Explanation of symbols]

 1 container 2 upper mold 3 lower mold 4 heater 5 press

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Matsuo 3-3-1 Higashi Station, Koga-shi, Fukuoka Inside Seibu Electric Machinery Co., Ltd. (72) Inventor Yusuke Kubota 3-3-1 East Higashi, Koga-shi, Fukuoka West F term (reference) in Denki Corporation 2B027 NC12 NC21 NC24 NC33 ND01 2B260 AA20 BA07 BA08 BA15 BA18 BA26 CC02 CD16 CD30 DA09 DA11 DA13 DB02 DC05 DC20 DD02 DD03 EA05 EB02 EB06 EB08 EB12 EB21 3E033 BA30 BB01 BB01

Claims (12)

[Claims] 1. A step of producing a mixed raw material powder by uniformly mixing a plant raw material powder obtained by pulverizing a plant raw material containing rice hulls as a main component and a biodegradable raw material powder obtained by pulverizing a biodegradable substance containing a binder. And a step of compression-molding the mixed raw material powder into a container by applying heat and pressure to the container. 2. The method for producing a container made of a biodegradable material according to claim 1, wherein water is added to the mixed raw material powder. 3. The method for producing a biodegradable material container according to claim 1, wherein said plant raw material powder and said biodegradable raw material powder are crushed powders each crushed to 50 to 300 mesh. . 4. The conditions for compression molding of the mixed raw material powder by heating and pressing are as follows: a temperature of 100 to 200 ° C .;
The method for producing a container made of a biodegradable material according to claim 1, wherein the container has a molding time of 0 kg / cm ² and a molding time of 3 to 30 seconds. 5. The method for producing a biodegradable material container according to claim 1, wherein the thickness of the container formed by compression molding of the mixed raw material powder is 0.5 mm or more. 6. The method for producing a biodegradable material container according to claim 1, wherein an inclination angle of the container formed by compression molding of the mixed raw material powder is 15 ° or more. 7. The mixed raw material powder comprises the plant raw material 60.
The method for producing a biodegradable material container according to claim 1, wherein the biodegradable material container is a mixture of -90% and 10-40% of the biodegradable substance. 8. The method for producing a container made of a biodegradable material according to claim 1, wherein the plant material can be mixed with plant fibers such as straw and pulp. 9. The biodegradable substance according to claim 1, wherein the biodegradable substance is rosin, dammer, copal, gelatin, starch, shellac, calcium carbonate, biodegradable plastic, or a mixed powder thereof. Manufacturing method of material container. 10. The biodegradable material container according to claim 1, wherein the binder of the biodegradable substance is rosin, dammer, copal, gelatin, starch, shellac, or a mixed powder thereof. Manufacturing method. 11. The method for producing a biodegradable material container according to claim 1, wherein an oxidative preservative and / or a bleaching agent is mixed with the mixed raw material powder. 12. The method for producing a biodegradable material container according to claim 1, wherein the rice husks use rice husks separated from brown rice by rubbing dry rice husks.