JP2002205726A - Plant material tray containers and their manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide tray containers which can be used as tableware, manufactured from a plant material, and the technology to manufacture them. SOLUTION: Rice husks 1 as the plant material and a binder 3 such as a urea resin are pulverized 2 and made into a fine powder 4. Then, the pulverized and powdered rice husks 1 and the binder 3 are measured 5 and mixed 6. In addition, they are agitated 8 by an agitator with a shellac 1 as an additive. The agitated mixture 9 of the rice husks 1, the binder 3 and the shellac 7 is heated 11 and compressed 12 by a molding machine. Thus, a tray container molded article 13 is molded 10. The tray container molded article 13 is coated 14, and a tray container 16 which can prevent folmaldehyde from being emitted is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container in which a plant material is bound with a binder, and more particularly to a tray container for food made from a plant material mainly composed of cereal husks, and a technique for producing the same. About.

[0002]

2. Description of the Related Art In general, disposable food containers such as lunch boxes have been widely used, and those containers made of styrene foam or paper have been used in many cases. With the enforcement of the Container Recycling Law, containers using plant-based materials have also been used. However, styrofoam containers have environmental hormones, styrene problems, etc., and have problems in terms of food hygiene safety or disposal.

[0003] Next, PSP containers are fragile and difficult to hold, and paper containers are not safe for food safety because of the long period of time when wax is used as a coating agent. The anxiety has not been removed.
Furthermore, already used containers of plant-based materials are fragile and expensive, and the phenolic resin used as a bander contains formaldehyde and may be released to the environment after disposal of the food in the container and the container. There is.

[0004]

As described above, styrofoam containers and the like, which are currently being mass-produced and used, are harmful to environmental preservation at the time of disposal after use. . In other words, these styrofoam containers cannot be incinerated due to the generation of high temperature and harmful smoke, and cannot be returned to soil because they retain their shape semipermanently even when buried in soil. is there. Furthermore, containers using vegetable raw materials have problems in strength and are expensive and expensive.

The present invention has been made based on such a technical background, and achieves the following objects. SUMMARY OF THE INVENTION An object of the present invention is to provide a vegetal raw material tray container which can eliminate the fragile drawbacks of a styrene foam container and a paper container which are currently in the mainstream, and which can enhance the strength, and a technique for manufacturing the same.

Another object of the present invention is to provide a tray container for a plant-based raw material in which emission of formaldehyde harmful to food is suppressed within a reference value, and a technique for producing the same. Still another object of the present invention is to provide a vegetable material tray container that can be supplied at a low production cost and a production technique therefor.

It is another object of the present invention to provide a vegetable material tray container adapted to, for example, a microwave oven and having improved heat resistance, and a technique for producing the same. It is a further object of the present invention to provide a plant material tray container which can be disposed of in the same manner as ordinary waste, and which can be buried in soil and disposed of, and a manufacturing technique therefor.

[0008]

Means for Solving the Problems The container for vegetable material trays of the present invention comprises:
A binder container which has been pulverized and finely powdered, an additive for preventing formaldehyde emission, and a tray container molded article formed by mixing and stirring the vegetable raw material powder, the binder powder and the additive, and shaping the mixture. It consists of a coating material to be coated.

[0009] The above-mentioned vegetable material may be a vegetable material,
Vegetable fibers are particularly preferred, but cereal shells are also preferred. Since cereals are produced in large quantities, they are effective in that their shells can be used effectively. Further, the binder is preferably a thermosetting resin. Preferably, urea formaldehyde resin (urea resin), melamine resin,
It is good to consist of one or more thermosetting resins selected from phenolic resins. However, since the container is hardened only with the thermosetting resin, it is preferable to add a thermoplastic resin such as an ethylene-vinyl acetate copolymer resin and casein. Further, the ratio of the ethylene-vinyl acetate copolymer resin is increased or decreased depending on the shape of the container to be manufactured. However, since it is based on a thermosetting resin, it has an effect on heat resistance even when used in a microwave oven or the like.

[0010] Therefore, the binder may contain a thermoplastic resin as a softening agent. Further, the binder may contain casein as a softening agent. Further, the additive may be shellac. Because it is a natural additive, it is harmless to foods served in containers and is effective in preventing the emission of formaldehyde from molded containers.

Further, the coating material may be at least one selected from a coating material in which a ceramic powder and a binder and a dispersant are mixed, polylactic acid, and corn starch which is corn starch. It is effective in eliminating the fragility of the container and preventing the fragments from scattering when broken. The ceramic powder may be a component such as SiO ₂ , Al ₂ O ₃ , TiO ₂ , or ZrO ₂ . This is a coating agent in which a binder such as water glass and a synthetic resin of the kind used as a paint and a dispersant are mixed.

The method for producing trays of vegetable material trays according to the present invention comprises a first step of pulverizing and pulverizing the vegetable material and the binder, and preventing formaldehyde emission into the pulverized vegetable material and the binder. The second step of adding, measuring, mixing and stirring the above additives, and heating and pressurizing the stirred mixture of the plant material, the binder, and the additive with a molding machine to form a tray container molded product. Third
And a fourth step of coating the formed tray container molded product.

In the first step, the vegetable material and the binder may be finely pulverized to 60 to 100 mesh, respectively. It is a crushed mesh effective for molding,
In this step, the vegetable raw material and the binder may be ground by separate facilities.

Further, in the second step, the weight ratio is 1.2% to 1.8% with respect to the total amount of the thermosetting resin in the binder.
May be added and the mixture may be stirred.
This additive may be shellac. It is effective in preventing the emission of formaldehyde from the molded container.

Further, the heating temperature in the third step is 13
It may be 0 ° C to 270 ° C. Further, the third step
Pressure is 4.4 MPa ± 1.5 MPa (45 kg / cm
^Two± 15kg / cm^Two).

Further, in the third step, the molded product of the tray container may be formed so as to have a thickness of 1 mm ± 0.5 mm. The strength of the container is ensured, and it is easy to handle and an economical configuration is possible. Further, the mixing ratio in the second step is such that the plant material is 65% to 75% by weight.
25% to 3% of the binder and the additive.
It may be 5%.

Further, when a plurality of types of the binders are used, the mixing ratio of the fine powder of the binder and the additive is such that the urea formaldehyde resin is 15 wt.
% To 18%, 5% to 7% ethylene-vinyl acetate copolymer
%, Casein is 5% ± 1%, and the shellac may be added to the binder in a weight ratio of 1.2% to 1.8% of the total amount of the thermosetting resin in the binder.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a process chart showing a method for producing a vegetable material tray container according to the present invention, and FIGS. 2 and 3 are structural views showing the structure. Here, the tray containers include containers having a deep bottom such as cups in addition to flat containers such as lunch boxes. Vegetable raw materials are intended for shells of cereals such as rice and buckwheat. In the present invention, rice hulls will be described as an example.

In the first step (a), the rice husk 1 and the binder 3 are separately pulverized and pulverized. The rice husk 1 is pulverized 2 by the pulverizer A. The binder 3 is pulverized 4 by a pulverizer B. The rice hulls 1 are obtained by threshing cereal grains obtained by threshing rice after harvesting as described above, and applying the rice husks to a rice huller to separate the rice and rice husks. In the current state of Japan, where rice is the staple food, it is also a large amount of agricultural waste. Binder 3 is
Thermosetting resin, urea formaldehyde resin (urea resin), melamine resin (MF), phenol resin (P
F), and an ethylene-vinyl acetate copolymer resin (EV
A), casein and the like. A thermosetting resin is a material that has an adhesive effect on vegetable fibers and is hardly deformed even when heated.

Ethylene vinyl acetate copolymer as a thermoplastic resin as a softener has an adhesive effect. Similarly, casein, which is a kind of phosphoprotein as a softener, has an adhesive effect. ) Has a feature. Rice husk 1 and binder 3 are both crushed by a crusher.
It is pulverized into a mesh. The crushed and finely pulverized rice hulls 1 and 4 and the binder 3 are weighed 5 in the second step b and mixed at a predetermined ratio 6.

At the time of this mixing 6, shellac 7 is added to the mixed fine powder as an additive for preventing formaldehyde. The ratio of the addition is 1.2% to 1.5% based on the total amount of the binder 3. The mixing ratio of the rice husk 1 and the binder 3 is 65% to 75% for the rice husk 1 and 25% to 35% for the binder 3. When a plurality of binders 3 are used, the ratio varies depending on the application, and the amount used also varies.

For example, when producing deep-bottomed containers such as bowls and cups, the ratio of fine powder is as follows.
%, The binder 3 is 18% of urea resin, 7% of ethylene polymer, and 5% of casein, which is 30% in total. Furthermore, when manufacturing shallow containers such as dishes, the proportion of fine powder is as follows: rice husk 1 is 75% by weight, binder 3 is 15% urea resin, ethylene vinyl acetate copolymer is 5%,
Casein is 5% and the total binder is 25%. In each case, shellac 7 is added in an amount of 1.2% to 1.5% based on the total weight of the binder 3. Shellac 7
If is in powder form, it is mixed as it is, but if it is not in powder form, it is pulverized in the same manner as rice husk 1 and binder 3 and then weighed and mixed.

The mixed rice husk 1, the binder 3, and the shellac 7 are stirred 8 by a stirrer in a second step B to form a mixture 9. In the second step (b), each of the powders is a crushed powder of the rice husk 1, depending on the tray container to be molded.
While adjusting the type and amount of the pulverized powder body of the binder 3, the mixture 3 is stirred 8 by a mixing stirrer 19 (see FIG. 3) until the mixture becomes a mixed body 9. The agitated mixture 9 is moved to the third step C for molding, and a predetermined amount is supplied to the female mold 23 of the molding machine 17 to be molded 10.

The heating device 22 provided on the male mold 21 and the female mold 23 heats 11 in the range of 130 ° C. to 270 ° C. Subsequently, the mixture 9 was moved to 4.4 MPa ± 1.4 MPa (45 kg / cm ² ± 1) by the relative movement of the male mold 21 and the female mold 23.
It is molded by applying a pressure of 12 in the range of 5 kg / cm ² ). The thickness of the molded tray container 13 is 1 mm ± 0.5 mm
It is.

The tray container molded product 13 formed into the shape of the tray container 16 by the third step c of this molding is:
Next, in order to coat the inside of the tray container molded product 13, a coating 14 is applied in a fourth step d. This coating 14 is performed by an automatic spray method. The surface to which the coating 14 is applied is the inner surface that is directly in contact with food. By applying the coating 14, the fragility can be eliminated and the fragments at the time of breakage can be prevented from scattering.

The coating material 15 is a coating material in which a binder such as ceramic powder and water glass and an organic solvent such as a lacquer thinner are mixed. This is, for example, a product name “Heatless Glass” (GS-600-1 (normal temperature)). Glass) manufactured by Ohashi Chemical Industry Co., Ltd. and sold by ITOCHU Nonferrous Materials Co., Ltd.) The water glass is obtained by using an alkali silicate obtained by melting silicon dioxide and an alkali as a concentrated water bath. In addition, polylactic acid, constarch, etc. are used. When the coating 14 is applied, the tray container molded product 13 is completed as a tray container 16 and carried out by a conveyor or the like to become a product. The tray container 16 has excellent heat resistance. For example, it can correspond to a microwave oven, and the heat-resistant temperature range is -25 ° C to + 250 ° C.
That is all. In addition, as shown in the above-mentioned steps, since it can be manufactured at low cost, it can be supplied to the market as a tray container at a lower price than a styrene foam container or the like.

These containers are: 1) trays for display for sale, 2) cups for urine analysis, 3) tableware (for display of prepared dishes, for sale, trays for microwave oven, bowl for microwave oven, cup for instant noodle, bowl, refreshing. Drinking water cups, take-out cups, etc.), but are not limited thereto.

2 and 3 are views showing the configuration of the forming process of the tray container 16, FIG. 2 is a plan view, and FIG. 3 is a side view. More specifically, a pulverizer 18 and a mixing / stirring machine 19 are installed adjacent to each other on the left side of the figure with the molding machine 17 at the center. Above the crusher 18, the respective storage tanks 20a, 20b of the rice husk 1, the binder 3, and the shellac 7,
20c and a predetermined amount of material is accumulated. These materials and the like are finely pulverized 2 and 4 in each pulverizer 18, and are weighed and mixed by a mixing stirrer 19 provided at a lower portion, and are stirred.
Is done.

The materials and the like may be pulverized outside the apparatus, for example, at another place in a warehouse or the like, and transported to the respective tanks in the form of dust. Stirred mixture 9
Is supplied to the molding machine 17 by a predetermined amount by supply means 24 provided between the molding machine 17 and the molding machine 17. The molding machine 17 performs press molding, and the mixture 9 is supplied to the female mold 23 of the molding machine 17. The female mold 23 is supported by a hydraulic cylinder 25 so as to be vertically movable.

Above the female mold 23, four support members 2
The male mold 21 is provided in a state of being held by the mold holder 21 a supported by the mold 6, and the mixture is moved closer to each other and supplied to the female mold 23 by relative movement with the female mold 23. 9 is press-molded. A heating device 22 is provided in each of the two molds, the male mold 21 and the female mold 23, and is set to the above-mentioned temperature range.

A coating device 27 is provided on the tray container molded product unloading side of the molding machine 17, and the press-formed tray container molded product 13 is taken out by the unloading means 28 and sent to the coating device.
Has a spray and has a tray container molded product 13 by automatic spraying.
Coating the inner surface of The coated tray container molded product 13 is automatically conveyed to a predetermined position on the conveyor 29 as the tray container 16 to become a product. The tray container 16 is manufactured by being pressed by the molding machine 17 having such a configuration. The tray container 16 of the present invention is used for a food lunch box or the like. Therefore, the safety standards of the Food Sanitation Law must be cleared.

FIGS. 4, 5 and 6 show a concrete tray container 1.
FIG. 4 shows a shallow container 30 such as a lunch box or a side dish box. FIG. 5 shows a container 31 having a relatively deep bottom, such as a cup ramen. FIG. 6 shows a container 32 having a deeper bottom, such as a container such as popcorn or a cup such as juice. Both are tray containers 1
The food enters the inner side 30a, 31a, 32a of 6.

In terms of safety, the rice husk 1 is a natural plant, so there is no problem.
Although the inside of the tray container 16 is coated, it cannot be said that there is no risk that even a small amount of the chemical component will dissolve into the food. In particular, urea resins are expected to contain formaldehyde. For this reason, the use of the tray container 16 made of the rice husk 1 for food has many restrictions in terms of food safety in addition to the weakness of the tray container itself, has many problems, and is not in a state of widespread use. .

In the present invention, shellac 7 is added to the binder 3.
The above-mentioned problem has been solved by adding. Next, the shellac 7 will be described in detail. Shellac 7 is a resinous substance secreted by lac shellworm that infests plants in the South Sea after sucking sap. This is a natural resin that has been known for a long time, and shellac 7 is the only thermosetting resin as a natural resin. Known manufacturer materials (Shellac & SPECIFI, Nippon Shellac Co., Ltd.)
According to (CATION), the relevant features, components, and the like in producing a vegetable container are as follows.

1. Characteristics It is dissolved in alcohol and easily melted by heat, but once cured by heat, it is not immersed in heat or solvent. Remarkably strong oil resistance. Electrically non-conductive. Excellent wear resistance. After dissolving in alcohol and applying, after the solvent evaporates, it is excellent in gloss at room temperature, smooth, abrasion resistance, adhesion,
Form a thin film with high durability. It is almost insoluble or only swells in organic solvents other than alcohol.

2, Component Shellac is composed of about 95% of shellac resin and about 5% of shellac wax. Shellac resin is a natural condensation product formed by oxycarboxy chemically bonded to each other as a lactone. And its chemical composition is in the estimated range, but the following structural formula is accepted:

[0037]

(Equation 1)

[0038] It is believed that it also contains up to 2% putoric acid, small amounts of palmitic acid, myristic acid and the like. Shellac wax, according to a study published by Schaeffer, is a wax soluble in warm alcohol (85% of total wax) laxia dicerol (C ₂₅ H ₅₁ O).
H) and an ester of laxia diseric acid (C ₂₅ H ₅₁ OOH), melting point 80-81 ° C., hot alcohol-insoluble wax (15% of total wax) rackerol (C ₃₂ H ₆₅ O)
Ester mp 93-94 ° C. for H) and Rakkeru acid (C ₃₁ H ₆₃ COH), are said to contain small amounts of unsaponifiable waxes other.

3, Properties Specific gravity: 1.02 to 1.12, Specific heat: 0.53 (at 0 ° C.), Softening point: 70 to 75 ° C., Electrical properties: 1) Electric insulation strength 20 to 50 kv / m
m, 2) dielectric constant 2.7 to 3.5, 3) specific resistance 10
Ωcm (at 22 ° C), heat curing: becomes alcohol-insoluble when heated at 125 ° C for about 3 hours, solubility: 1) soluble solvent: monohydric alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol 2) Insoluble solvents: aromatic hydrocarbons and petroleum solvents such as benzol and xylol; 3) partially soluble and swellable solvents: esters such as methyl acetate and ethyl acetate; polyhydric alcohols such as ethylene glycol; Ketones such as acetone and MEK; 4) Mixed solvents: Soluble in solvents in which esters, ketones, and hydrocarbons are mixed mainly with alcohols. 5) Resins: Phenolic resins, urea resins, rosin, and maleic. Acid resin, nitrified cotton vinyl acetate resin, polyvinyl butyral resin, ketone resin, chemical resistance shellac Coating very strong acid, but not immersed in about rather to accelerate the curing, relatively weak alkaline to dissolve or swell in warm alkaline water.

4. Example of Shellac Product Table 1 shows a refined white rack used as an example of powder. Table 2 shows an aqueous shellac solution which is used directly to apply to a product to reduce formaldehyde and the like. These purified white lac or aqueous shellac solutions are used after being dissolved in ethanol or 100% alcohol.

[0041]

[Table 1]

[0042]

[Table 2]

From these characteristics, it can be effectively used as an additive to a mixture for molding food containers. As described above, the thermosetting becomes alcohol-insoluble when heated at 125 ° C. for about 3 hours. In addition, it is compatible with phenol resin and the like, and has chemical resistance. That is, the shellac coating is very resistant to acids and promotes curing. Tray containers molded using such properties are completely heat-cured and prevent formaldehyde from being radiated in a sealed state. The problem of food hygiene and safety was solved by taking advantage of the characteristics of shellac because it is a natural resin.

As another additive for preventing the emission of formaldehyde, there is a formalin sealer (natural resin paint manufactured by Sansei Paint Co., Ltd.). This is because the ingredient is natural resin,
It is used as a food additive and has a proven track record in safety. It is biodegradable and does not degrade the environment. In addition, it has the feature that no harmful gas is generated by incineration. It has been used in many fields such as building materials. In particular, they are excellent in the ability to block chemical substances such as formaldehyde, and are effective when added as an additive to the mixture.

This effect is an example used for plywood of a house, which is a regulation value for formaldehyde emission, which clears the standard value of WHO of 0.08 ppm or less, and also shows a comparison between before and after painting a formalin sealer. According to the manufacturer's data, 96.1% of the deterrence rates are presented. The suppression using this formalin sealer is based on a method of absorbing and removing the generated formaldehyde with an adsorbent such as activated carbon, or a method of coating and shielding the formaldehyde generation source with a paint or the like.

When this formalin sealer is used in the additive of the present invention in the same manner as shellac, the effect of suppressing the regulated value relating to formaldehyde emission to the reference value or less can be obtained in food containers as described above. What is called a formalin killer also has the same characteristics as described above,
It can be used as an additive for forming tray containers.

As described above, the present invention particularly effectively uses shellac or formalin sealer as an inhibitor to prevent formaldehyde. When discarding the container manufactured by the present invention, since rice husk is used as a base material, it can be discarded together with household garbage.
The temperature at which this container is incinerated is the same as that for general waste. It does not become hot like styrofoam and generate harmful smoke and gas. Furthermore, even if the soil is buried in the soil, the microorganisms are degraded, so that it can be returned to the natural world.

[0048]

As described above, the method according to the present invention comprises:
By using shellac as an additive, there is no risk of dissolving or releasing formaldehyde, etc., and it meets food safety standards, so tray containers molded by this method can be used as safe dishes such as lunch boxes. it can. Furthermore, since the chaff and the binder are pulverized and finely pulverized and agitated and formed, the tray container can be easily manufactured at low cost.

Further, the tray container overcomes brittleness, has strength, has heat resistance, and can be used in a microwave oven. Further, in the disposal processing, incineration processing can be performed as general waste and burial processing can be performed in the soil, so that the environment is not deteriorated.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process chart showing a method for producing a vegetable material tray container of the present invention.

FIG. 2 is a plan view showing an outline of an apparatus for manufacturing container containers for vegetable raw material trays.

FIG. 3 is a side view showing an outline of an apparatus for manufacturing vegetable raw material tray containers.

FIG. 4 is an external view showing an example of a vegetable material tray container having a shallow bottom of a lunch box.

FIG. 5 is an external view showing an example of a cup ramen type of vegetable raw material tray containers.

FIG. 6 is an external view showing an example of a deep-bottomed cup type of vegetable raw material tray containers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rice husk 3 ... Binder 6 ... Mixing 7 ... Shellac 8 ... Stirring 9 ... Mixture 10 ... Molding 14 ... Coating 16 ... Tray container

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // (C08L 97/02 C08L 23:08 61:24 89:00 23:08 93:02) 89:00 B65D 1 / 00 BRQA 93:02) C (72) Inventor Haruyoshi Moritsugu 1-17-17-401 Honcho, Omuta-shi, Fukuoka F-term (reference) 3E033 AA08 AA10 BA30 BB04 CA20 DD01 FA01 3E086 AD05 AD06 BA04 BA24 BA29 BB90 DA08 4J002 AD024 AF015 AH001 BB063 CC162 GG01

Claims (16)

[Claims] 1. A pulverized and finely powdered vegetable material powder, a pulverized and finely powdered binder powder, an additive for preventing formaldehyde emission, the vegetable raw material powder and the binder powder, A tray material for vegetable raw materials, comprising a coating material for coating a molded product of a tray container molded by mixing and stirring the additives. 2. The vegetable material tray container according to claim 1, wherein the vegetable material is cereal husks. 3. The vegetable material tray container according to claim 1, wherein the binder is made of a thermosetting resin. 4. The vegetable raw material tray container according to claim 1, wherein the binder contains a thermoplastic resin as a softening agent. 5. The container according to claim 1, wherein said binder contains casein as a softening agent. 6. The vegetable material tray container according to claim 1, wherein the additive is shellac. 7. The container according to claim 1, wherein said coating material is selected from a coating material in which ceramic powder is mixed with a binder and a dispersant, polylactic acid, and corn starch. Vegetable raw material tray containers characterized by being seeds. 8. A first step of pulverizing and pulverizing the vegetable raw material and the binder, adding an additive for preventing formaldehyde emission to the pulverized and pulverized vegetable raw material and the binder, measuring, mixing and stirring. A second step, a third step of heating and pressurizing the stirred mixture of the vegetable material, the binder, and the additive with a molding machine to form a tray container molded product; and the molded tray container A method for producing container containers for vegetable raw material, comprising: a fourth step of coating a molded article of a kind; 9. The method according to claim 8, wherein the first step comprises pulverizing the vegetable material and the binder to a size of 60 to 100 mesh. Method for producing vegetable raw material tray containers. 10. The method according to claim 8, wherein the second step comprises the step of controlling the weight ratio of the thermosetting resin in the binder to 1.2% to 1.8%. A method for producing container containers for vegetable raw materials, wherein the additives are added and stirred. 11. The method according to claim 8, wherein the heating temperature in the third step is 130 ° C. to 270 ° C. Production method. 12. The method according to claim 8, wherein the pressing force in the third step is 4.4 MPa ± 1.5 Mpa.
A method for producing vegetal raw material tray containers. 13. The method according to claim 8, wherein in the third step, the molded thickness of the tray container is 1 m.
A method for producing container containers for vegetable raw materials, wherein the container is formed so as to have a diameter of m ± 0.5 mm. 14. The method according to claim 8, wherein the mixing ratio in the second step is such that the vegetable material is 65% to 75% by weight. A method for producing vegetable material tray containers, wherein the binder and the additive are 25% to 35%. 15. The method for producing a vegetable material tray container according to claim 10, wherein the additive is shellac. 16. The method for producing a container for vegetable-based trays according to claim 14, wherein when a plurality of types of the binders are used, the mixing ratio of the fine powder of the binder and the additive is expressed by weight. Urea formaldehyde resin 15% -18%, ethylene vinyl acetate copolymer 5% -7%, casein 5% ± 1
%, To which the shellac having a weight ratio of 1.2% to 1.8% of the total amount of the thermosetting resin in the binder is added.