JP2000327839A - Biodegradable material composition, container made of biodegradable material comprising same and preparation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a disposal goods and the like perfectly decomposable by a microorganism, sunlight or the like with time by uniformly mixing a vegetable raw material powder obtained by crushing a vegetable raw material such as a rice hull with bran of grain such as rice bran or the like thereby giving a mixed material and subjecting this mixed material to pressure molding into a vessel having a predetermined shape. SOLUTION: A mixed material is preferably composed of 60-75 wt.% of a vegetable raw material and 40-25 wt.% of bran, each in a state of crushed powder of 30-400 mesh. Desirably, the vegetable raw material powder is selected among hulls, bamboos, sugar canes, straws, pulp and mixed powders of at least two of these. The mixed material are molded under the conditions of a temperature of 140-180 deg.C, a pressure of 10-80 kg/cm2 and a molding time of 3-40 sec. Preferably, a woven fabric and/or a nonwoven fabric composed of a biodegradable substance is added to the mixed material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable material composition comprising a plant material such as rice husk, a biodegradable material container comprising the composition, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a food tray using a biodegradable nonwoven fabric and a food tray displayed in a showcase and a disposable container as a case are disclosed in, for example, JP-A-4-189.
The one disclosed in Japanese Patent Publication No. 740 is known. The food tray comprises a fiber web composed of cellulosic natural fibers or cellulosic regenerated or semi-synthetic fibers or a mixture thereof, bonded with an interfiber binder mainly composed of chitosan salt, and the weight of the fibers is 100%. Of a biodegradable nonwoven fabric having a basis weight of 200 g / m ² or more in which a water repellent is adhered to a solid portion in an amount of 1 to 10 parts by weight.
It is formed in a saucer shape compression-molded with m ³ or more.

[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 problem 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 above-described method for producing a degradable 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 mainly to a plant raw material such as rice husk and a cereal bran such as rice bran capable of exhibiting a function as a biodegradable adhesive. A biodegradable material composition obtained by uniformly mixing raw material powders obtained by pulverizing the biodegradable material and, in some cases, a woven fabric made of a biodegradable material to increase the strength of the biodegradable material composition while maintaining a light weight. And / or to provide a container prepared by press-molding the composition into a predetermined shape and a method for producing the same, wherein the composition comprising the molded container is provided. After the material is disposed of, the container material is broken down in a short period of time with the aid of microbial decomposition and sunlight, ultraviolet rays, etc., whereby the container itself is decomposed into harmless soil, and the decomposed substances can be used as soil amendments Together with the weave And rigidity during use by adding / or nonwoven, intensity, it is capable of improving the mechanical properties of the shape-retaining, and the like.

[0007] The present invention relates to a biodegradable material composition comprising a mixture of plant raw material powder obtained by grinding plant raw materials such as rice hulls and cereal bran such as rice bran. This biodegradable material composition is obtained by adding a woven fabric and / or a nonwoven fabric made of a biodegradable substance to the mixed material. Here, the cereal bran functions as a biodegradable adhesive and can bind plant raw material powder such as rice husk to each other.

[0008] The present invention also relates to a biodegradable material container formed from a biodegradable material composition comprising a mixture of plant material powder obtained by grinding plant material such as rice husk and cereal bran such as rice bran. . In this container made of a biodegradable material, a woven fabric and / or a nonwoven fabric made of a biodegradable substance can be added to the mixture.

[0009] Further, the mixed material may contain the plant material 60-
It is prepared by mixing 75 wt% and the bran 40 to 25 wt%. The plant raw material powder is selected from the chaff, bamboo, sugarcane, straw, pulp, and a mixed powder of two or more of these.

Further, the present invention provides a mixed material by uniformly mixing a plant material powder obtained by pulverizing a plant material such as rice hulls and a cereal bran such as rice bran, and then mixing the mixed material with a predetermined material. The present invention relates to a method for producing a container made of a biodegradable material, which is formed by press-forming a container having a shape as described above.

In the method of manufacturing a container made of a biodegradable material, a woven fabric and / or a non-woven fabric made of a biodegradable substance is added to the mixed material. In this manufacturing method, the mixed material is laminated on the woven fabric and / or the non-woven fabric and molded by heating and pressing, or the mixed material is added to the woven fabric and / or the non-woven fabric to form a predetermined shape. The mixture is press-molded into a sheet material, and then the mixture is laminated on the sheet material, followed by heat and pressure molding. That is, the method of manufacturing a container made of a biodegradable material includes the steps of: adding the mixture to the woven fabric and / or the nonwoven fabric formed into a predetermined shape;
The sheet material is formed by pressure molding into the container having the predetermined shape, or a woven fabric and / or a nonwoven fabric and a mixture material, and the mixture material is laminated on the sheet material. The container was integrally formed by heating and pressing.

In the method for manufacturing a container made of a biodegradable material, the mixed material is composed of pulverized powder pulverized to 30 to 400 mesh. The molding conditions of the mixed material are as follows: a temperature of 150 to 170 ° C., a pressure of 10 to 80 kg / cm ^2, and a molding time of 3 to 40 seconds.

The chaff used as the plant raw material powder can be chaff separated from brown rice by rubbing dry chaff. Therefore, the rice hulls used here do not need to be washed or dried and disinfected in the manufacturing process, and can be sufficiently sterilized during the heating and molding of the mixed material. Should be handled.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the biodegradable material composition according to the present invention, a container made of the biodegradable material comprising the composition and a method for producing the same will be described. First, this biodegradable material composition is composed of a mixture of plant raw material powder obtained by pulverizing plant raw materials such as rice hulls and cereal bran such as rice bran. For example, rice bran contains rice bran wax and can act as a biodegradable adhesive. Therefore, the bran has an action as a biodegradable adhesive for bonding powders such as rice husks to each other. Therefore, when a tangible product is produced from the composition, the composition can exhibit shape retention properties that maintain the shape of the product.

[0015] A woven fabric and / or a nonwoven fabric made of a biodegradable substance can be added to the composition. When added to this composition in a state where a woven fabric such as gauze, a net-like member, a strand, and / or a non-woven fabric such as a fiber or a fiber is embedded, the mechanical strength can be improved. The shape of various products formed can be preserved. Since this composition is composed entirely of biodegradable materials, it can be broken down in a short period of time with the help of microbial degradation and sunlight, ultraviolet rays, etc., whereby the composition itself is broken down into harmless soil and other substances. Decomposed substances can be used for soil amendments, etc., and slurry (slurry) of plant material of biodegradable materials
By adding a woven fabric and / or a non-woven fabric to the product, mechanical properties such as rigidity, strength, shape retention and the like during use of the product can be improved.

Hereinafter, an embodiment of a container made of a biodegradable material and a method of manufacturing the same according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of a manufacturing apparatus used in a method of manufacturing a biodegradable material container according to the present invention, and FIG. 2 is an embodiment of a container manufacturing process in the biodegradable material container manufacturing method according to the present invention. FIG. 3 is a block diagram showing another embodiment of the container manufacturing process in the method for manufacturing a biodegradable material container according to the present invention.

First, an embodiment of a container made of a biodegradable material and a method of manufacturing the same according to the present invention will be described with reference to FIGS. This biodegradable material container is made from the above biodegradable material composition, and is formed from a mixture of plant material powder obtained by grinding plant material such as rice husk and cereal bran such as rice bran. I have. This container is made of cereal bran
In particular, when rice bran is used, the rice bran wax contained in the rice bran effectively acts as a biodegradable adhesive, and binds plant material powders such as rice hulls to each other to produce a preferable container. The plant raw material powder is composed of a powder selected from the above rice hulls, bamboo, sugarcane, straw, pulp, and a mixture of two or more of these. As the combination of the mixed material composed of cereal bran and plant material powder, rice bran and rice husk, rice bran and bamboo, rice bran and sugar cane, rice bran and rice husk and bamboo, and the like can be selected.

This container made of biodegradable material can be used not only for tableware, containers, packaging boxes, cans, bags, etc., but also for plant cultivation containers such as flowerpots and vegetation pots. 60% to 75% by weight of a plant material powder of a ground material obtained by pulverizing a plant material to be used is 40 to 2 rice bran as a biodegradable adhesive.
It is composed of a mixed material 1 of mixed raw material powder mixed with 5 wt%, and is composed of a slurry 1S in which water is added to the mixed material 1 depending on the water content of the mixed material 1. The plant material powder such as rice husk and rice bran which constitute the container are broken down by microorganisms or broken down by sunlight, ultraviolet rays, etc., and converted into harmless soil, water, carbon dioxide, etc. .

In this method of manufacturing a container, a container having a desired shape can be easily formed by applying heat and pressure by the manufacturing apparatus shown in FIG. The container manufacturing apparatus used in this container manufacturing method includes, for example, a heating temperature T of the upper mold 2 and the lower mold 3 as a mold provided with the heater 4 and the pressurizing device 5 and the upper mold 2 and the lower mold 3. And a controller 6 for controlling a load P of the pressurizing device 5. As the upper mold 2 and the lower mold 3, various types can be used, and for example, a water-absorbing type such as a porous type or a gypsum type can be used.

The method of manufacturing this container is as follows. A mixture (1) of the mixed raw material powder or a slurry (slurry) obtained by adding a small amount of water to the mixed material 1 of the mixed raw material powder is placed between the upper mold 2 and the lower mold 3. After filling, the heater 4 provided for the upper mold 2 and the lower mold 3 is energized to control the heating temperature T of the upper mold 2 and the lower mold 3.
The pressurizing device 5 is actuated to apply the load P and press-mold the mixed material 1. The raw material powder of the mixed material 1 is, for example, 30 to 400.
It is preferable that each container is made of a crushed powder crushed into a mesh because various containers can be easily formed. The molding condition of the mixed material 1 is, for example, a molding temperature of 130.
To 180 ° C., preferably 150 to 170 ° C., a molding pressure of 10 to 80 kg / cm ² and a molding time of 3 to 40 seconds.

The method of manufacturing the container made of the biodegradable material is as follows: a plant material powder obtained by pulverizing a plant material such as rice husk and a mixed material powder obtained by uniformly mixing a biodegradable adhesive consisting of cereal bran such as rice bran. The manufacturing process is followed by a process in which the mixed raw material powder is heated to a desired molding temperature by the heater 4 and pressurized by the pressurizing device 5 to be compression-molded into a container. As shown in FIG. 2, in this method of manufacturing the container, a predetermined amount of chaff is prepared as a plant material (step 10), and the chaff is crushed to 30 to 400 mesh with a crusher or the like (step 11). (Step 12). On the other hand, a predetermined amount of rice bran having a function of a biodegradable adhesive is prepared in conformity with the blending amount with rice hull (step 13).
The prepared rice bran is pulverized to 30 to 400 mesh with a pulverizer or the like (step 14) to produce a bran raw material (step 15).

Next, the plant raw material powder and the rice bran as a biodegradable adhesive are blended in a predetermined ratio and uniformly mixed with a mixer or the like to produce a mixed raw material powder, that is, a mixed material (step 16).
At this time, it is preferable that the mixture ratio of the raw material powder and the rice bran of the biodegradable adhesive is 60 to 75 wt% of rice husk and 40 to 25 wt% of rice bran. Here, if the amount of the rice bran is small, the bonding strength of the rice bran to the rice husk is insufficient, and the hot press molding is not entirely solidified during hot pressing, brittle, and it is difficult to keep the shape. On the other hand, if the amount of the rice bran is too large, the oil and the rice bran wax of the rice bran emerge, the oil droplets become excessive, and the oil liquid remains on the surface of the molded product. Therefore, the mixing ratio of rice bran to the plant raw material powder is preferably within the above range.

When the mixed material 1 of the mixed raw material powder is heated and pressurized and compression-molded by a forming apparatus which is a container manufacturing apparatus, a predetermined amount of water may be added depending on the raw material selected for preparing the mixed raw material powder. is there. At this time, depending on the selected material, there is, of course, no need to add water. Next, the mixed material 1 of the mixed raw material powder is filled between the upper mold 2 and the lower mold 3 using a predetermined molding apparatus, for example, a molding apparatus as shown in FIG. There are various types of molding devices. For example, the lower mold 3 may be a water-absorbing mold such as a gypsum mold. Upper mold 2 and lower mold 3
The heater 4 provided is supplied with electricity, the pressurizing device 5 is operated, the load P is applied, and the mixed material 1 is press-formed by heating and pressurizing (step 17). The container can be removed to obtain a biodegradable material container (step 18).

In this embodiment, the molding apparatus is set so that the molding temperature is 150 to 170 ° C., the molding pressure is 10 to 80 kg / cm ^2, and the molding time is 3 to 40 seconds. Is preferred. For example, the controller 6 sets the heating temperature of the upper mold 2 to 16
0 to 170 ° C, and set the heating temperature of the lower mold 3 to 15
Set to 0-160 ° C. In this embodiment, the upper mold 2 is set at a higher temperature than the lower mold 3. However, when the mixed material 1 is heated and pressed, there is a phenomenon that a molded product remains in the mold on the low temperature side. In the example, the molded product is left in the lower mold 3. When the temperature of the upper mold 2 and the lower mold 3 is set to 150 ° C. or lower, the rice bran adhesion reaction is slowed down and the molding time is prolonged.
Molded articles may be defective. When the temperatures of the upper mold 2 and the lower mold 3 are set to 170 ° C. or higher, a phenomenon occurs in which the molded product is burned if the molding time is slightly increased. Therefore, if the molding time is about 30 seconds, the molding temperature is preferably about 150 to 170 ° C. The molding pressure is preferably about 10 to 80 kg / cm ^{2 in} consideration of the molding temperature and the molding time of the mold. Further, the thickness of the container formed by the compression molding of the mixture 1 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. It is preferable from the viewpoint of the mechanical physical properties.

Next, another embodiment of the method of manufacturing a container made of a biodegradable material according to the present invention will be described with reference to FIG.
In the method of manufacturing a container according to this embodiment, a woven fabric and / or a nonwoven fabric made of a biodegradable substance are added to the mixed material. In the method of manufacturing this container, as a method of adding a woven fabric and / or a non-woven fabric to the mixture, for example, a woven fabric and / or
Alternatively, a mixed material of slurry is applied to the laminated nonwoven fabric, which is first formed into a predetermined shape into a sheet shape by a pressing device 5 or the like, dried, and then the solidified and dried sheet material is formed into a lower mold 3.
After adding and mixing the mixture material from the sheet material, the heater 4 is placed in a container having a predetermined shape.
And pressurizing and molding with a pressure device 5.

In the manufacturing method for adding a woven fabric and / or a non-woven fabric to the mixed material in this embodiment, since the steps from step 10 to step 16 are the same as those in the above-described embodiment, these steps will be described here. Omitted. A gauze, a net-like member, a thread, or the like can be selected as the woven fabric of the biodegradable substance, and a fiber, a fiber, or the like can be selected as the nonwoven fabric of the biodegradable substance (step 19). These woven and / or nonwoven fabrics may be formed into a sheet-like material embedded in the admixture, or added to the admixture by placing on either or both sides of the admixture. . A sheet material made of a woven fabric and / or a laminated nonwoven fabric is set in the lower mold 3, and the mixture 1 is added to the sheet material, and the woven fabric and / or the nonwoven fabric is mixed with the mixture 1
Embedded therein, or a state in which a woven fabric and / or a non-woven fabric are lined with the mixed material 1, or a state in which the woven fabric and / or
Alternatively, the mixture 1 is applied to the non-woven fabric, and then the heater 4 is energized by a command from the controller 6, and the upper die 2 is operated by the pressurizing device 5 to heat and press the mixture 1 (step 20). Then, the molded article is cooled to obtain a biodegradable material container (step 21).

[0027]

Since the present invention is configured as described above, it has the following effects. This biodegradable material composition is completely degraded by microorganisms, sunlight, etc. over time, so that it can be used for producing disposable products and the like. Also, when making a container made of disposable biodegradable material,
In a very simple manufacturing process, it can be manufactured by bonding plant raw material powders such as rice husks with rice bran as an adhesive. In addition, the container made of the biodegradable material 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 it is discarded, the material itself that constitutes the container is biodegraded by microorganisms,
In particular, since it can be converted into harmless soil that can be returned to the soil by disintegrating with ultraviolet light, there is no need to perform incineration, recycling, etc., so that such treatment can be omitted and it can be used as a soil improvement material for agricultural crops. 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 schematic explanatory view of a manufacturing apparatus used in a method of manufacturing a container made of a biodegradable material according to the present invention.

FIG. 2 is a block diagram showing one embodiment of a container manufacturing process in the method for manufacturing a biodegradable material container according to the present invention.

FIG. 3 is a block diagram showing another embodiment of the container manufacturing process in the method for manufacturing a biodegradable material container according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixed material 2 Upper mold 3 Lower mold 4 Heater 5 Pressurizing device 6 Controller

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) B65D 1/09 C08L 97/02 4J002 1/34 B29C 67/14 W C08J 5/00 CEP X C08L 97/02 B65D 1 / 00 A // B29K 105: 06 (72) Inventor Hideaki Suema 3-3-1 Higashi Station, Koga City, Fukuoka Prefecture Inside Seibu Electric Machinery Co., Ltd. (72) Inventor Yoji Kai 3-3-1 Higashi Station, Koga City Fukuoka Prefecture No. Seibu Electric Co., Ltd. (72) Inventor Norio Matsuo 3-3-1, Higashi Station, Koga-shi, Fukuoka Prefecture Seibu Electric Co., Ltd. (72) Inventor Tatsuya Hamachi 598-4 Kuroda, Katsuyama-cho, Kyoto-gun, Fukuoka Prefecture F-term (reference) in Oka Chemical Industry Co., Ltd. 4F204 AA01 AD16 AG03 AH01 AH52 AH54 AH56 AR02 AR06 AR11 AR12 FA01 FA18 FB01 FB11 FB22 FF01 FF05 FG02 FN11 FN15 4F205 AA01 AD16 AG03 AH01 AH52 AH54 AH56 AR02 AR06 AR11 AR12 HA08 HA14 HA22 HA31 HA35 HB01 HB11 HC11 HF01 HK03 HK04 HK16 4J002 AB04X AH00W GG01

Claims (12)

[Claims] 1. A biodegradable material composition comprising a mixture of plant material powder obtained by grinding plant material such as rice hulls and cereal bran such as rice bran. 2. The biodegradable material composition according to claim 1, wherein a woven fabric and / or a nonwoven fabric made of a biodegradable substance is added to the mixture. 3. A biodegradable material container formed from a biodegradable material composition comprising a mixture of plant material powder obtained by grinding plant material such as rice hulls and cereal bran such as rice bran. 4. A container made of a biodegradable material according to claim 3, wherein a woven fabric and / or a nonwoven fabric made of a biodegradable substance is added to the mixture. 5. The mixed material according to claim 1, wherein the plant material is 60 to 75.
The container made of a biodegradable material according to claim 3 or 4, which is composed of wt% and 40 to 25 wt% of the bran. 6. The method according to claim 3, wherein the plant material powder is selected from the chaff, bamboo, sugarcane, straw, pulp, and a mixed powder of two or more of these.
A container made of a biodegradable material according to the above item. 7. A mixed material is prepared by uniformly mixing plant material powder obtained by grinding plant material such as rice hulls and cereal bran such as rice bran, and then mixing the mixed material in a container having a predetermined shape. A method for producing a container made of a biodegradable material, comprising press-molding a container. 8. The method for producing a biodegradable material container according to claim 7, wherein a woven fabric and / or a nonwoven fabric made of a biodegradable substance is added to the mixed material. 9. The method for producing a container made of a biodegradable material according to claim 7, wherein the mixture is laminated on the woven fabric and / or the nonwoven fabric and molded by heating and pressing. 10. The mixed material is added to the woven fabric and / or the non-woven fabric and pressed into a sheet material having a predetermined shape. Then, the mixed material is laminated on the sheet material and heated. 9. The method for producing a biodegradable material container according to claim 8, wherein the container is formed by pressing. 11. The production of a container made of a biodegradable material according to claim 7, wherein the mixed material is constituted by pulverized powder pulverized to 30 to 400 mesh. Method. 12. The molding condition of the mixed material is as follows.
8. The method according to claim 7, wherein the pressure ranges from 0 to 180 ° C., the pressure ranges from 10 to 80 kg / cm ^2, and the molding time ranges from 3 to 40 seconds.
11. The method for producing a container made of a biodegradable material according to any one of items 10 to 10.