JP2002201402A - Process for preparation of coating material for naturally decomposable eating utensils - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide eating utensils which are molded from a biodegradable substance and are made to give a moderate strength and to decompose naturally or biodegradably so as not to cause pollution. SOLUTION: The process for preparing a coating material for naturally decomposable eating utensils comprises the feeding of 30% by volume of ethyl cellulose powder into an ethanol with a concentration of 65% to 100%; the heating thereof at about 80 deg.C under an atmospheric pressure; and the forming thereof by dissolving the ethyl cellulose powder in the ethanol.

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 coating material for naturally decomposable tableware,
The present invention relates to a method for producing a coating material for naturally decomposable tableware, which is capable of coating a coating material made of a biodegradable or naturally degradable substance on a material surface of tableware molded with a naturally decomposable substance.

[0002]

2. Description of the Related Art
As an example of a biodegradable tableware, there is known one in which cereal granules or cereal powders are put into a tableware mold, which is then subjected to high-pressure high-heat treatment and molded. Thus, since the dishes have biodegradable properties, even if they are left in nature after use,
The problem of biodegradation or spontaneous decomposition and remaining in nature as garbage is eliminated.

However, when hot water at about 100 ° C. is poured into the dishes, the dishes begin to dissolve in about 30 minutes, and the dishes cannot function as dishes.

[0004] Therefore, it is necessary to solve the problem of obtaining tableware formed of a biodegradable substance, which has an appropriate strength and which does not dissolve early even when boiling water is poured. A technical problem arises, and an object of the present invention is to solve the problem.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and 30% by volume of ethylcellulose powder is put in 65% to 100% of ethanol and the atmospheric pressure is reduced. A method for producing a coating material for spontaneously decomposable tableware produced by dissolving the ethylcellulose powder in the ethanol under heating at about 80 ° C. below, and a volume ratio of ethylcellulose of 6% to 30%. In some cases, the mixed solution of the ethyl cellulose and the ethanol is further placed in a pressure vessel and pressurized until the pressure reaches 2 BR, whereby spontaneous decomposition formed so as to be dissolved in the ethanol up to 60% of the volume ratio of the ethyl cellulose. It is intended to provide a method for producing a coating material for sex tableware.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. In the figure, reference numeral 1 denotes tableware coated with the coating material W of the present invention. As the tableware 1, various kinds such as bowls, cups, chopsticks and the like are selected.

In the same manner as in the prior art, for example, the tableware 1 is prepared by charging, for example, threshed cereal granules or powder into a mold and coating the surface of a tableware material M molded under an atmosphere of high pressure and high heat with the coating material W of the present invention. Become composed. However, the tableware 1
Is not limited thereto, and includes all substances that are decomposed by microorganisms or water when left in the natural world after use.

However, the tableware material M formed from the above-mentioned material is vulnerable to boiling water and deteriorates quickly, so that it cannot be put to practical use in normal use as tableware. Then, the coating solution produced by dissolving ethyl cellulose in ethanol on the surface of the tableware material M is sprayed using a spray nozzle, and the tableware 1 is completed by completely drying the coating solution.

According to the first aspect of the present invention, an ethyl cellulose powder having a volume ratio of 30% and a concentration of 65% to 10% are used.
The ethyl cellulose powder is dissolved in the ethanol in 0% ethanol. The ethyl cellulose powder is mixed with the ethanol together with water, and the mixture is heated at about 80 ° C. under atmospheric pressure. The ethylcellulose powder is homogeneously dissolved in ethanol to produce a generally transparent liquid or kneaded coating material W. And when the coating material W is kneaded, it is diluted by mixing ethanol again, and
Used in liquid form.

[0010] Thus, the coating material W is a nozzle,
60 ° C by injection system consisting of compressor etc.
The high-heated air heated as described above is used to spray the material M of the tableware 1 onto the surface of the material M. Then, it is completely dried in a high-temperature atmosphere of 60 ° C. or more to form a coating layer 2 having a particle size of ethyl cellulose of less than about 5 μ on the surface of the tableware material M. The coating layer 2 made of ethyl cellulose is uniformly diffused on the surface of the tableware material M to form a transparent body. In this way, the surface of the tableware material M does not cause crystallization of ethylcellulose due to the complete drying, and therefore the tableware 1 is appropriate even with the coating layer 2 having a thickness of about 5 μ. This means that the strength has been given.

Since the tableware material M itself is weak to heat, and has water permeability or water absorption, it is possible for moisture or the like of food to enter the tableware material M and deteriorate the quality. However, since the surface of the tableware material M is protected by the coating layer 2, the coating material W
The tableware 1 coated with is not easily dissolved even if immersed in boiling water for more than 30 minutes. Therefore, it is natural that the tableware 1 can be practically used in a normal use state.

It should be noted that the coating material formed by dissolving the ethyl cellulose in ethanol is 60 ° C.
If it is not sprayed under the above atmosphere, it is not possible to spray uniformly on the surface of the tableware material M, so that not only a transparent film cannot be formed, but also a coating is uneven and white portions are scattered. Become. Therefore, the white portion is extremely fragile, and therefore, the strength as a coating material cannot be sufficiently maintained.
It cannot be put to practical use. For this reason, the coating material W is sprayed onto the surface of the tableware material M using compressed air having a high temperature of 60 ° C. or more, and is completely dried to obtain a finished product.

Furthermore, the coated tableware 1
Since tableware 1 is water-resistant to cold water and does not deteriorate over a year or more, the tableware 1 can be mass-produced and stored for a long time.

Ethyl cellulose, which is the main component of the coating material W, is well decomposed by microorganisms, is harmless to the human body, and is easily digested. After the tableware 1 is used as the tableware 1, if the coating material W containing ethyl cellulose as a main component is peeled off from the tableware material M and then dissolved again in ethanol, the tableware 1 can be reused.

Next, the second aspect of the present invention will be described. The invention according to claim 2 is characterized in that, when the volume of the ethylcellulose powder is 6% to 30% by volume, the mixed solution with the ethanol is further placed in a pressure vessel and pressurized until the pressure reaches 2BR. Ethyl cellulose is 6 by volume
By dissolving in ethanol to 0%, a liquid or kneaded transparent coating material W can be obtained. When the coating material W is kneaded, it is diluted by mixing ethanol.
And it shall be used in liquid state. Then, the coating material W is sprayed on the surface of the tableware material M by a spray nozzle,
60 ° C by injection system consisting of compressor etc.
Injection is performed using the heated high-temperature air. Then, the coating material W is completely dried in a high temperature atmosphere of 60 ° C. or more to form a coating layer 2 having a particle size of the coating material W of less than about 5 μ on the surface of the tableware material M.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

According to the present invention, as described in detail in the above embodiment, the coating material according to any one of claims 1 and 2 is sprayed on the surface of tableware formed of a biodegradable substance. It is natural that the tableware itself can be sufficiently used as ordinary tableware, and the strength of the tableware is maintained by the coating material, and the tableware can be stored for a long time. This also improves productivity and contributes to cost reduction.

Furthermore, even if the dishes equipped with the coating material of the present invention are left in nature after use, they are naturally decomposed by microorganisms, water, etc., and therefore remain for a long time as garbage. It is an invention that has various and significant effects, such as that the problem of pollution can be solved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a perspective view of tableware.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tableware 2 Coating layer W Coating material M Tableware material

Continued on the front page F-term (reference) 3B001 AA01 AA02 AA11 CC01 CC07 CC11 CC35 CC36 CC38 DB03 4J038 BA101 JA19 KA06 LA03 MA08 MA09 NA27

Claims (2)

[Claims] 1. An ethyl cellulose powder having a volume ratio of 30% is put in ethanol having a concentration of 65% to 100% and heated at about 80 ° C. under atmospheric pressure to dissolve the ethyl cellulose powder in the ethanol. A method for producing a coating material for naturally decomposable tableware, comprising: 2. The volume ratio of ethyl cellulose is from 6% to 30%.
% Powder, the mixed solution of the ethyl cellulose and the ethanol is further placed in a pressure vessel and pressurized to 2BR so that it can be dissolved in the ethanol up to 60% of the volume ratio of the ethyl cellulose. The method for producing a coating material for naturally degradable tableware according to claim 1, wherein the coating material is formed.