KR200366379Y1 - Biodegradable starch bowl having a protrusion on the bottom part of the bowl - Google Patents

Abstract

In the present invention, a biodegradable starch container having a body portion and a bottom portion formed in a desired shape in a biodegradable starch container, and having a protrusion formed at the bottom of the bottom portion. To provide. And, the biodegradable starch container is the protrusion is hemisphere; Polygonal pillars; Or cone; is preferably in the shape of. In addition, the biodegradable starch container, the height of the protrusion is 0.2 ~ 3.0mm, the surface area where the ground and the bottom of one of the protrusion is in contact with 30mm ² or less, it is preferable that the number of such protrusions is 3 to 5. In addition, the biodegradable starch container is 20 ~ 60wt% non-modified starch, 5 ~ 30wt% pulp fiber powder, 30 ~ 60wt% solvent, 0.1 ~ 2.0wt% photocatalyst, 0.01 ~ 1wt% preservative and 0.5 ~ 5wt% release agent It is a container molded into a desired shape by heating and pressurizing the composition for biodegradable starch container comprised, It is preferable that the biodegradable film adhered to the inner surface of the said container. According to the present invention, in the biodegradable starch container, there is no sticking phenomenon at the bottom even when cooking in a microwave oven, furthermore, it is possible to ensure sterilization, deodorization function, long-term preservation, release property, and sufficient water resistance easily. It is possible to secure and to achieve the effect of reinforcing the strength of the container.

Description

Biodegradable starch bowl having a protrusion on the bottom part of the bowl}

The present invention relates to a biodegradable starch vessel having protrusions at the bottom of the vessel.

Specifically, the present invention relates to an environmentally superior biodegradable starch container having improved usability by preventing its bottom from sticking when cooking in a heating body such as a microwave oven.

In the present invention, when the container is placed in the space, it means a portion of the container having a continuous horizontal plane that is in contact with or spaced apart from the surface in the space.

In the present invention, the body portion means a portion of the container supported by the bottom portion.

In the present invention, the protruding portion means a portion protruding downwardly formed at the bottom portion integrally with or separately from the container.

The hemisphere in the present invention is used as a meaning including not only the shape of the hemisphere in the exact sense, but also the distance from the center is not the same.

Recently, due to an increase in the use of disposable foods, the development of containers for storing disposable foods has been actively made.

In particular, in order to improve the environmental pollution caused by disposable containers made of expandable synthetic resin, plastic, silver foil, and the like, biodegradable disposable containers made of natural polymers such as paper and starch, which have been conventionally decomposed after embedding, have been studied.

The biodegradable disposable container is unlike the case of using a synthetic resin, it is biodegradable, so there is no problem of environmental pollution, and also has the advantage of easy processing.

In the case of using the disposable container, a container in which food such as ramen or the like is stored may be cooked immediately by applying heat to a microwave oven or the like.

When cooking a container such as a ramen made of a conventional PSP, paper, etc. in a microwave oven, in the case of the PSP, secondary foaming occurs and the shape of the container is deformed or sticks to the bottom of the microwave oven. In addition, in the case of a container made of paper, a leak occurs due to carbonization of the bottom of the container, so that the soup leaks.

In the case of biodegradable starch containers, when cooking in a microwave oven, the bottom portion sticks to the contact surface with the microwave oven.

This phenomenon occurs when the water contained in the starch container evaporates when cooking in a microwave oven. That is, the water in the body portion of the starch container may be released to the external space during evaporation, but the bottom portion of the starch container is sealed due to the continuous surface contact of the bottom portion, so that the evaporated water is not released into the external space. Thus, the moisture is dried after melting the starch at the bottom, in which the bottom of the starch container is stuck to the inner bottom of the microwave oven.

1A is a side schematic view of a conventional starch container, and FIG. 1B is a bottom schematic view of the container of FIG. 1A.

Figure 2 is a photograph showing that the sticking phenomenon occurs in the bottom when cooking in a microwave oven using a conventional starch container.

As shown in FIG. 1A, a conventional starch container 10 manufactured for a food container such as cup noodles is generally molded to have a body portion 11 and a bottom portion 12. In addition, as shown in FIG. 1B, the bottom portion 12 has a space 15 recessed toward the container body portion 11 side. In particular, this space is closed while contacting the bottom surface of the microwave oven.

As shown in FIG. 2, when the space is sealed in a microwave oven and heat is applied thereto, moisture contained in the starch container is trapped in the sealed space while evaporating, and the water not released releases starch at the bottom. Is dissolved and then dried. This causes the bottom of the container to stick to the microwave oven.

This sticking phenomenon not only makes continuous cooking difficult, but also makes the soup easy to flow out.

Furthermore, in the case of cooking using a conventional container, the inconvenience of having to remove the bottom of the stuck container from a heating body such as a microwave oven is caused, and the appearance of the container is not good due to the deformation of the container, and the handling of the container when eating Even inconvenience is caused.

On the other hand, the biodegradable disposable container has a problem that the inside or outside of the container is contaminated by Escherichia coli, 0-157 bacteria, Pseudomonas aeruginosa, Staphylococcus aureus, Salmonella, etc., and also depending on the storage environment there is a possibility of corruption by microorganisms It has the problem that it is very weak in the preservation.

In addition, the biodegradable disposable container has a problem that the impact resistance is inferior as compared to the conventional plastic, there is also a problem that the water penetration is easy because the water resistance is also weak.

In addition, the biodegradable disposable container has a problem that the production efficiency is lowered because the release property is weak. That is, when manufacturing a biodegradable disposable container, when the depth of the container is, for example, 5cm or more, the container is not easily detached from the mold, and therefore, the inconvenience of having to detach the container manually by stopping the process and then manually. As a result, there is a problem that productivity is lowered as a result.

Therefore, even when heat is applied to the biodegradable starch container, a biodegradable starch container that does not stick to the contact surface with a heating element such as a microwave oven is required, and furthermore, sterilization and deodorization are possible, and long-term storage resistance, mold release property and sufficient water resistance A starch container that can be secured is required.

Therefore, the present invention is to solve the above problems,

An object of the present invention, when cooking using a biodegradable starch container, so that the bottom of the container does not stick to the bottom surface of the heating body such as a microwave oven, it is possible to ensure a good cooking function, eliminating the inconvenience in use It is to provide a biodegradable starch container that can be.

Another aspect of the object of the present invention is that, while the biodegradable starch container is provided with a good cooking function as described above, sterilization, deodorizing function, long-term storage, mold release properties, sufficient water resistance can be secured, and the strength of the container It is to provide a biodegradable starch container for reinforcement.

1A is a side schematic view showing a conventional starch container,

1B is a bottom schematic view of the container of FIG. 1A;

2 is a photograph showing that the sticking phenomenon of the bottom occurs when cooking in a microwave oven using a conventional starch container,

Figure 3a is a side schematic view showing a biodegradable starch container having a protrusion in the bottom according to an embodiment of the present invention,

3B is a bottom schematic view of the container of FIG. 3A;

Figure 4 is a photograph showing a molding mold for producing a biodegradable starch container according to an embodiment of the present invention,

Figure 5a is a photograph showing a mold cavity having an air vent hole applied to one embodiment of the manufacturing method of the present invention,

5B is a photograph showing a shape in which a container of the present invention is put into a mold cavity having an air vent hole in one embodiment of the manufacturing method of the present invention;

Figure 5c is a photograph showing a process of transferring the film to the heater portion in one embodiment of the manufacturing method of the present invention,

Figure 5d is a photograph showing a process of heating and softening the film in one embodiment of the manufacturing method of the present invention,

5E is a photograph showing a vacuum suction process in one embodiment of the manufacturing method of the present invention,

Figure 5f is a photograph showing the step of completing the vacuum suction in one embodiment of the manufacturing method of the present invention,

Figure 5g is an embodiment of the manufacturing method of the present invention, a photograph showing a process of cutting the film around the container,

Figure 6a is a photograph showing a plane of the biodegradable starch container according to the present invention,

Figure 6b is a photograph showing the bottom of the container of Figure 6a,

Figure 6c is an enlarged photograph showing the protrusion of the container of Figure 6b,

Figure 7 is a photograph showing a biodegradable starch container having a protrusion at the bottom according to Example 1 of the present invention,

Figure 8 is a photograph showing a biodegradable starch container having a protrusion at the bottom according to Example 2 of the present invention,

Figure 9 is a photograph showing a biodegradable starch container having a protrusion at the bottom according to Example 3 of the present invention,

10 is a photograph showing a biodegradable starch container having a protrusion at a bottom portion according to Comparative Example 1 of the present invention;

11 is a photograph showing a biodegradable starch container formed with a line recessed in the bottom portion according to Comparative Example 2 of the present invention,

12 is a schematic view showing an apparatus for measuring the sterilization and deodorizing effect in the present invention,

Figure 13a is a photograph showing a container at the beginning of the buried in the present invention,

Figure 13b is a photograph showing a disassembled container after 20 days in the present invention,

Figure 13c is a photograph showing a disassembled container after 40 days elapsed in the present invention,

13D is a photograph showing the disassembled container after 100 days have elapsed in the present invention.

* Short description of the major reference marks *

10, 100: biodegradable starch container 11, 110: body part

12, 120: bottom 130: protrusion

15, 150: space at the bottom

In order to achieve the object of the present invention as described above, the present invention is a biodegradable starch container, formed in a desired shape, a container having a body and a bottom portion, characterized in that a protrusion is formed on a portion of the bottom portion. .

And, the biodegradable starch container is the protrusion is hemisphere; Polygonal pillars; Or conical;

In addition, the biodegradable starch container, the height of the protrusion is 0.2 ~ 3.0mm, the surface area where the ground and the bottom of one of the protrusion is in contact with 30mm ² or less, it is preferable that the number of such protrusions is 3 to 5.

In addition, the biodegradable starch container, 20 ~ 60wt% non-modified starch, 5 ~ 30wt% pulp fiber powder, 30 ~ 60wt% solvent, 0.1 ~ 2.0wt% photocatalyst, 0.01 ~ 1wt% preservative and 0.5 ~ 5wt% release agent It is a container molded into a desired shape by heating and pressing the composition for biodegradable starch container consisting of, it is preferable that the biodegradable film is attached to the inner surface of the container.

In addition, the unmodified starch is preferably at least one starch selected from the group consisting of corn, potato, wheat, rice, tapioca and sweet potato.

And it is preferable that the said pulp fiber powder is 10-200 micrometers in fiber length, and it is more preferable that the said pulp fiber powder is pulp fiber powder which crushed the hardwood.

The photocatalyst is preferably titanium dioxide having an anatase content of 70% or more.

Or the photocatalyst is titanium dioxide doped with at least one metal selected from the group consisting of iron (III), vanadium, molybdenum, niobium, and platinum, and the photocatalyst is iron (III) doped It is more preferable that it is titanium dioxide.

Or as said photocatalyst, it is preferable to use the metal oxide of silicon dioxide, vanadium pentoxide, or tungsten oxide individually, or to use two or more together.

And the preservative is preferably any one or more selected from the group consisting of sorbic acid, potassium sorbate, sodium benzoate, sodium propionate.

The release agent is preferably any one or more selected from the group consisting of monostearyl citrate and magnesium stearate, and the release agent is more preferably a mixture of monostearyl citrate and magnesium stearate in a weight ratio of 1: 1.5. .

The solvent is preferably any one selected from the group consisting of water, an alcohol, an aqueous alkali solution and an acidic aqueous solution, and more preferably the solvent is water.

The biodegradable film may include at least one selected from the group consisting of polylactic acid, polycaprolactone, polybutyrene succinate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, ester starch and cellulose acetate. desirable.

And as for the said biodegradable film, it is preferable that the thickness of the film bonded to a container is 100-300 micrometers.

Hereinafter, a biodegradable starch container having a protrusion at the bottom of the container according to the present invention will be described in detail.

First, the biodegradable starch container according to the present invention is formed by heating and pressing the composition for a biodegradable starch container into a desired shape, the container having a body portion and a bottom portion, and a part of the bottom portion is provided with a protrusion. do.

Figure 3a is a side schematic view showing a biodegradable starch container having a protrusion at the bottom of the container according to an embodiment of the present invention, Figure 3b is a bottom schematic view of the container of Figure 3a.

As shown in Figures 3a and 3b, the biodegradable starch container 100 having a protrusion at the bottom of the container according to an embodiment of the present invention has a body portion 110 and a bottom portion 120, the bottom By forming a protruding portion 130 protruding downward in a portion of the portion 120, moisture can escape from the space 150 of the bottom portion to be sealed when heated in the microwave oven.

That is, by minimizing the bottom contact area of the container and the microwave and providing a space for moisture to escape, it is possible to prevent the sticking phenomenon at the bottom of the bottom by inducing the evaporation of moisture.

In this case, the protrusion may be formed by molding as a unit with the container from the time of molding in the mold, and, after molding the container, the protrusion may be attached to a separate protrusion. However, molding in one piece is preferred in view of the efficiency of the manufacturing process.

The protrusion should have a contact area such that it does not stick to the microwave oven, and as a suitable shape, for example, a hemisphere, a polygonal column, or a cone shape in which the ball is cut in half is preferable, and is suitable in size and contact. The area and the number of protrusions are preferably 0.2 mm to 3.0 mm in height and the surface area in contact with the ground of the protrusions is 30 mm ² or less, so that the number of such protrusions is 3 to 5.

Hereinafter, a method for producing a biodegradable starch container according to the present invention will be described in detail.

In order to prepare the starch container, a biodegradable starch container composition is first provided.

In the present invention, the composition for a biodegradable starch container, in particular, containing starch as an unmodified starch, containing pulp fiber powder to reinforce tensile strength and bending resistance, and containing water as a solvent, sterilization and deodorizing effect It includes a photocatalyst to give, and a preservative for increasing the preservation and a release agent for increasing the release property.

At this time, the non-modified starch is suitable to include 20 ~ 60wt%, the pulp fiber powder is suitable to include 5 ~ 30wt%, the solvent is suitable to include 30 ~ 60wt%, the photocatalyst It is suitable to include the agent in 0.1 to 2.0wt%, the preservative is suitable to include 0.01 to 1wt%, the release agent is suitable to include 0.5 to 5wt%.

In detail, first, the biodegradable starch, in particular, to use anionic natural starch, that is, non-modified starch, by using a non-modified starch that does not undergo a separate physical and chemical treatment, such as to simplify the manufacturing process relatively Can reduce manufacturing costs.

As the unmodified starch, corn, waxy corn, potato, tapioca, sweet potato, rice, glutinous rice, wheat, barley, and other seeds having an amylose content of 40% or less may be used, in particular corn, potato, wheat, rice, tapioca, etc. It is appropriate to use at least one starch selected from the group consisting of sweet potatoes.

Such non-modified starch is suitable to contain 20 ~ 60wt% of the total composition, if less than 20wt% it is difficult to uniformly disperse pulp and various additives due to the lack of starch to act as an organic binder, more than 60wt% In this case, there is a problem that impact strength and water resistance are lowered.

Next, pulp fiber powder is included.

That is, in the case of the non-modified starch, since they usually have an anion charge of 500 meq or more, they are agglomerated with each other. As a result, the binding energy between molecules is weakened, and thus the overall strength and water resistance are weakened.

Therefore, in order to prevent this, powdered fine pulp fibers which are finely powdered by grinding the pulp with a grinder can be used to increase the apparent density, to reduce the volume, and to reduce the agglomeration of each other. Overall strength such as tensile strength and bending resistance can be increased.

As the pulp fiber, one or more selected from wood, straw, sugar cane, reed, bamboo, wood stem, bast fiber, leaf fiber and seedling fiber may be used.

At this time, the use of the pulp fibers having a length of 10 ~ 200㎛ is suitable for increasing the dispersibility of the fiber powder in the composition, and to maintain the strength of the molded body constant for each part.

In the case of using the hardwood, that is, the long fiber, and the coniferous, that is, the short fiber among the pulp fibers, there is a slight difference in the amount of distribution depending on the length of the fiber pulverized even when using the same size screen.

Table 1 shows the fiber length distribution when the hardwoods are ground through a 0.35 mm hole screen (the apparent bulk density of the fiber: 30-50 g / l).

Fiber length (㎛) Distribution 32 or less 18% 32-50 11% 50-90 18% 90-150 28% 150-200 23% More than 200 2%

Table 2 shows the fiber length distribution when the conifers are pulverized through a 0.35 mm hole screen (the apparent bulk density of the fiber: 70-90 g / L).

Fiber length (㎛) Distribution 32 or less 12% 32-50 16% 50-90 29% 90-150 35% 150-200 6% More than 200 2%

As can be seen in Table 1 and Table 2, the length distribution of the pulverized pulp fiber is varied because the long fibers can be folded or twisted through holes of a predetermined size (0.35 mm) of the screen, By controlling the size of the screen hole, the distribution of the pulp fiber length can be controlled, but in this case, it still has various distributions.

In the present invention, it is preferable to use a hardwood pulp which is relatively superior in heat resistance to the softwood. This is because when the coniferous pulp powder is used, browning occurs in the finished product because it is carbonized by heat during molding.

Next, it is appropriate to use the solvent at 30 to 60 wt% as water, and in addition to water, other alcohols, alkaline aqueous solution and acidic aqueous solution may be used.

Next, since the photocatalyst is mixed for sterilization or deodorization, as the photocatalyst, iron (III) (Fe ³⁺ ), vanadium (V), molybdenum (Mo), niobium (Nb), platinum (Pt), etc. Titanium dioxide doped with metal, or metal oxides such as silicon dioxide (SiO ₂ ), vanadium pentoxide (V ₂ O ₅ ), tungsten oxide (WO ₃ ), or the like may be used alone or in combination of two or more.

In particular, it is appropriate to use titanium dioxide having an anatase content of 70% or more in terms of increasing sterilization and deodorizing power.

Specifically, there are three types of titanium dioxide, rutile, anatase, and brothite, depending on the crystal structure. Titanium dioxide having anatase content of 70% is 70% titanium anatase crystal structure, the remaining 30% is mostly rutile titanium dioxide, and very few are composed of brookite titanium dioxide. Since the anatase type shows high activity in the photocatalytic reaction, titanium dioxide having an anatase content of 70% or more can impart sufficient bactericidal and deodorizing effects.

The photocatalyst may be contained in an amount of 0.1 to 2.0 wt%, but if it is added in excess of the above range, there is a concern that the moldability and strength of the container may be lowered. Difficult to exercise

Next, as the preservative, it is preferable to use any one or more selected from the group consisting of sorbic acid, potassium sorbate, sodium benzoate, and sodium propionate, and it is preferable to contain 0.01 to 1 wt%.

Next, as the release agent, it is preferable to use any one or more selected from the group consisting of monostearyl citrate and magnesium stearate, and the release agent is preferably contained in 0.5 to 5wt%.

Figure 4 is a photograph showing a molding mold for producing a biodegradable starch container according to an embodiment of the present invention.

The mold as shown in FIG. 4 is for producing a biodegradable starch container in which the lower protrusion is in the shape of a hemisphere, and the hemisphere has a lower diameter of 5 mm x 1.0 mm in height.

After injecting the composition for biodegradable starch container as described above into the mold as described above, for example, biodegradable by heating to 140 ~ 220 ℃ and press molding for 1 to 5 minutes at a pressure of 0.5 ~ 8kgf / cm ² Make a disposable starch container.

In this case, in order to easily secure the water resistance to the prepared container during the manufacturing process, the biodegradable film may be laminated with the container.

5A is a photograph showing a mold cavity with an air vent hole applied to the manufacturing method of the present invention, and FIG. 5B is a photograph showing a shape in which the manufactured container is put into the mold cavity with the air vent hole.

As described above, after providing the container by molding to have a protrusion at the bottom, as shown in Figures 5a and 5b, the container is to be put into the mold cavity having an air vent hole.

Figure 5c is a photograph showing a process of transferring the prepared biodegradable film to the heater portion, Figure 5d is a photograph showing the process of heating and softening the film.

As shown in FIGS. 5C and 5D, the biodegradable film is transferred to a heater portion preheated to 80 to 250 ° C. to be softened by heating for 1 to 10 seconds.

At this time, in particular, the biodegradable film is composed of at least one selected from the group consisting of polylactic acid, polycaprolactone, polybutyrene succinate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, ester starch and cellulose acetate. It is preferable.

Moreover, it is preferable that the thickness of the film formed is 100-300 micrometers. If the thickness is less than 100 μm, the film may be thinly bonded to the inner surface of the container or the film may be torn, causing leakage of the liquid contents. If the thickness is larger than 300 μm, the manufacturing cost may be increased.

5E is a photograph showing a vacuum suction process through the mold cavity air vent hole, and FIG. 5F is a photograph showing a step in which the vacuum suction is completed.

5E and 5F, the softened film is placed on top of the molded container, and then the film is sucked for 0.5 to 10 seconds with a vacuum of 150 to 600 mmHg through the mold cavity air vent hole. It is in close contact with the inner surface of the container.

In addition, a pressure film lamination method can also be used instead of vacuum suction in this way.

That is, as described above, the container is put into a mold cavity with an air vent hole, the film is transferred to a heater portion previously heated at 80 to 250 ° C., softened by heating for 1 to 10 seconds, and then molded. Place the softened film on the top of the container, pressurize the film by injecting air at a pressure of 1-4 kgf / cm ² for 0.2 to 3 seconds from the outside through an air injector, and press the film to adhere to the inner surface of the container. can do.

In addition, the film lamination method by vacuum suction and the pressure film lamination method may be performed in parallel.

That is, as described above, the container is put into a mold cavity with an air vent hole, the film is transferred to a heater portion previously heated at 80 to 250 ° C., softened by heating for 1 to 10 seconds, and then molded. Place the softened film on the top of the container, pressurize the film while injecting air at a pressure of 1-4 kgf / cm ² for 0.2 to 3 seconds from the outside through an air injector, and at the same time, through the air vent hole of the mold cavity By sucking the film for 0.1 to 5 seconds in a vacuum of 150 ~ 600mmHg, the film can be in close contact with the inner surface of the container.

According to the parallel method of the film lamination method and the pneumatic film lamination method by vacuum suction, not only the lamination time can be shortened, but also the productivity of the starch container can be improved, and the adhesive strength between the film and the container can be improved. .

Figure 5g is a photograph showing a process of cutting the film around the container attached to the inner film produced as described above. And, Figure 6a is a photograph showing a plane of the biodegradable starch container according to the present invention, Figure 6b is a photograph showing the bottom of the container of Figure 6a, Figure 6c is a photograph showing an enlarged projection of the bottom of the container of Figure 6b .

As shown in Fig. 5g, by cutting the film of the lip portion of the container, as shown in Fig. 6, a biodegradability that can improve the water resistance and reinforce the strength of the container, a protrusion formed in the lower portion The biodegradable starch container provided with the film in the inner surface is completed.

The biodegradable starch container thus produced has no phenomenon of sticking to the bottom even when cooked in a microwave oven, and thus can be conveniently used, such as no overflow of the broth or the inconvenience of removing it from the microwave oven or the like.

Further, the biodegradable starch container according to the present invention, as described above, when the biodegradable film is provided on the inner surface of the container, without the addition of an additive for improving the water resistance, the water resistance at the post-molding step of the container easily It can be provided, and since the film itself is attached to the inside of the container, as compared with the case of the addition of the additives, it has the advantage of more faithful to ensuring the water resistance, and further improves the shelf life.

In addition, the biodegradable starch container according to the present invention, when produced by the composition for a predetermined biodegradable starch container as described above, is given the sterilization and deodorization function, long-term storage properties are improved, and the releasability is secured have.

FIG. 13A shows an initial container when landfilled, FIG. 13B shows a disassembled container after 20 days, FIG. 13C shows a disassembled container after 40 days, and FIG. 13D shows a disassembled container after 100 days. To indicate.

As can be seen in Figure 13a to 13d, the biodegradable starch container according to the present invention was confirmed to exhibit excellent biodegradation after 100 days, in particular, since the biodegradable film is attached to the inner surface deterioration of biodegradability due to film adhesion It was found out.

Hereinafter, the present invention will be described in more detail by describing preferred embodiments and comparative examples of the present invention. However, the present invention is not limited to the following examples, and various forms of embodiments may be implemented within the appended claims of utility model registration, and only the following examples are provided in the art to make the disclosure of the present invention complete. It is intended to facilitate the implementation of the invention to those of ordinary skill.

Example 1

-Starch container composition-

Natural polymer (corn starch) 36.7%

Pulp Fiber Powder 9.9%

0.5% TiO _{2 with} anatase content of 70% or more

(Or Fe-doped TiO ₂ )

0.2% preservative (potassium sorbate)

Mg Stearate 0.8%

Monosrearyl Citrate 1.2%

50.7% of water

The composition for molding was prepared by mixing and kneading with the composition for 20 minutes in a double jacket heating stirrer.

The prepared composition was placed in a mold having a protrusion at the bottom, and heated under pressure for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² , and a lower surface diameter of 7 mm × height of 0.9 mm as shown in FIG. 7. A vessel-shaped molded article having a hemispherical protrusion having an upper portion of was prepared.

FIG. 7 is a photograph showing a biodegradable starch container having a protrusion at a bottom portion formed of the molding composition. FIG.

-Bonding film to container-

A biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared container.

First, the biodegradable film was transferred to a heater portion previously heated to 200 ° C. and softened by heating for 5 seconds, and the softened film was placed on top of the molded container.

Thereafter, the film was sucked through the mold cavity air vent hole with a vacuum of 400 mmHg for about 10 seconds to bring the film into close contact with the inner surface of the container.

In addition, the film was pressurized while injecting air at a pressure of 4 kgf / cm ² for 3 seconds from the outside through an injector to bring the film into close contact with the inner surface of the container.

Thereafter, the film of the lip portion of the manufactured container was cut and 100 ° C. water was placed in a biodegradable starch container equipped with a biodegradable film on the inner surface thereof, and then heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed. It was.

Example 2

The starch container molding composition of Example 1 was placed in a mold having a protrusion at the bottom, and heated and pressurized for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² , and the lower surface as shown in FIG. 8. A container-shaped molded article having a hemispherical protrusion (hemispherical protrusion with an upper portion cut off) having a diameter of 4 mm x 0.4 mm in height was produced.

8 is a photograph showing a biodegradable starch container having protrusions at the bottom of the second embodiment.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

100 ° C of water was put into the prepared container and heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Example 3

The starch container molding composition of Example 1 was placed in a mold having a protrusion at the bottom, and heated and pressed for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² , and 10 mm as shown in FIG. 9. A vessel-shaped molded article having a square pillar protrusion of 3 mm x 1 mm was produced.

9 is a photograph showing a biodegradable starch container having protrusions at the bottom of the third embodiment.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

100 ° C of water was put into the prepared container and heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Comparative Example 1

The starch container molding composition of Example 1 was placed in a mold having a protrusion at the bottom, and heated and pressed for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² , as shown in FIG. 10. As a cylindrical protrusion of 15 mm x 1.3 mm in height, a container-shaped molded article having a cavity inside the protrusion was produced.

FIG. 10 is a photograph showing a biodegradable starch container having a protrusion at a bottom portion of Comparative Example 1. FIG.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

100 ° C of water was put into the prepared container and heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Comparative Example 2

The starch container molding composition of Example 1 was put into a mold in which a line shape protruded inwardly from a part of the lower bottom portion, and was heated and pressurized for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² . A container-shaped molded body having four recessed lines at the bottom as shown in FIG. 11 was prepared.

FIG. 11 is a photograph showing a biodegradable starch container having a line recessed in a bottom portion according to Comparative Example 2. FIG.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

100 ° C of water was put into the prepared container and heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Comparative Example 3

The starch container molding composition of Example 1 was placed in a mold having no protrusion at the bottom of the conventional form, and heated and molded for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² . Prepared.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

100 ° C of water was put into the prepared container and heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Comparative Example 4

The starch container molding composition of Example 1 was placed in a mold having no protrusion at the bottom of the conventional mold, and heated and molded for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² . A container shaped molded body was produced.

Biodegradable film having a thickness of 100 ~ 300㎛ film on the inner surface of the prepared starch container It bonded by the same method as Example 1.

After padding the paper as a supporting part on the bottom part of the prepared container, 100 ° C. water was added to the prepared container and heated in the microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Comparative Example 5

The starch container molding composition of Example 1 was placed in a mold having no protrusion at the bottom of the conventional mold, and heated and molded for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² . A container shaped molded body was produced.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

After the release agent was coated on the bottom of the prepared container, 100 ° C. water was added to the prepared container, heated in a microwave for 7 minutes, and the phenomenon of sticking to the bottom of the microwave was observed.

Comparative Example 6

The starch container molding composition of Example 1 was placed in a mold having no protrusion at the bottom of the conventional mold, and heated and molded for 150 seconds having a temperature of 180 ° C. and a pressure of 3 kgf / cm ² . A container shaped molded body was produced.

The biodegradable film having a thickness of 100 to 300 μm was bonded to the inner surface of the prepared starch container in the same manner as in Example 1.

After the film was adhered to the bottom of the prepared container, 100 ℃ water was put in the prepared container and heated for 7 minutes in the microwave oven, the phenomenon of sticking to the bottom of the microwave oven was observed.

Experimental Example 1: Evaluation of Sticking Phenomenon

Table 3 is a container molded on the basis of the composition of Example 1, when each 100 starch containers of the Examples and Comparative Examples were prepared and put in a microwave oven and heated, the sticking phenomenon with the bottom of the microwave oven was observed. One result.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Number stuck to bottom of container and bottom of microwave 0 0 0 19 13 100 79 61 87 Sticking to the bottom of the microwave none none none has exist has exist has exist has exist has exist has exist Evaluation method: The molded starch container was placed in a microwave oven and heated for 7 minutes, and then the container was evaluated to determine whether the bottom of the microwave was stuck to the bottom of the container. Evaluation method: When the container is removed from the microwave "None": When the container and the bottom of the microwave falls clean "Yes": When a part of the bottom of the container sticks to the bottom of the microwave and does not fall off at once

As can be seen from Table 3, the biodegradable starch container, characterized in that the hemispherical or square pillar-shaped protrusions formed on a portion of the bottom of the container, it can be seen that there is no sticking phenomenon at the bottom when cooking in a microwave oven.

Experimental Example 2: Measurement of Physical Properties of the Container

The physical property evaluation of the container which consists of the composition of Example 1 was performed by the following method.

First, in the measurement results of formability,? Indicates that the surface is smooth and there are no wrinkles or pinholes,? Indicates that the surface is relatively rough, but there are no wrinkles or pinholes, and X indicates that the surface has wrinkles or pinholes or is difficult to mold. To indicate.

In compressive strength, both sides of the container were compressed using a load cell at a speed of 2 mm / s to measure the strength when the container was broken. In the measurement results,? Indicates 5 kg · m / s ² or more, ○ indicates 3.5 kg · m / s ² , and X indicates that there are wrinkles or pinholes on the surface or that molding is difficult.

In off-flavor, ten researchers examined whether the container had an unpleasant odor other than the starch-specific odor. In the measurement results, N indicates 'none' and Y indicates 'yes'.

In browning, the color of the container was compared to the color of the standard composition (36.7% corn starch, 9.9% fiber powder and 53.4% water).

In the bactericidal effect, an ultraviolet (UV) lamp was placed inside a reactor as shown in FIG. 12 and surrounded by a quartz tube. It was.

Thereafter, light was irradiated with a 100W ultraviolet lamp having a wavelength of 360 nm, and after 1 hour, E. coli removal rate was measured in the reactor.

In the deodorizing effect, an ultraviolet lamp was placed in a reactor as shown in FIG. 12 and surrounded by a quartz tube, and then a sample of starch molding having a size of 50 mm x 80 mm was placed on the inner wall of the quartz tube, and acetaldehyde having a concentration of 600 ppm diluted with air. Passed through.

Thereafter, the light was irradiated with a 100W ultraviolet lamp having a wavelength of 360 nm, and after 1 hour, the decomposition efficiency of acetaldehyde was measured in the reactor.

In long-term storage, a container made of the composition of Example 1 was placed in a constant temperature and humidity chamber at a temperature of 30 ° C. and a relative humidity of 90%, and the degree of contamination of the container by mold was examined. In the measurement results, X indicates mold development within 20 days, ○ indicates mold development within 21 to 30 days, and? Indicates mold development between 31 and 90 days.

In the releasability, the number of containers attached to the upper mold was measured without falling into the lower mold during the molding of 100 container samples of Example 1. In Table 4, the smaller the number, the better the releasability.

Table 4 shows the results of measuring the moldability, compressive strength, odor, browning phenomenon, bactericidal effect, deodorant effect, integrity, mold release property of the container of Example 1.

Example Formability Compressive strength Off-flavor Browning Sterilization effect (E. coli removal rate) Deodorization Effect (Acetaldehyde Degradation Rate) Preservation Release (count) One ◎ ◎ N N 100% 100% ◎ 0

As shown in Table 4, in particular, the container made of the composition of Example 1 using titanium dioxide having anatase content of 70% or more as a photocatalyst was confirmed to have excellent sterilization and deodorization effects. However, when an expensive photocatalyst is added 1wt% or more, it may cause a cost increase of the composition.

On the other hand, when 0.2 wt% of potassium sorbate was added as a preservative, it was found to not only prevent odor and browning, but also have excellent mold suppression.

Experimental Example 3 Water Resistance Test

In Experimental Example 3, in order to evaluate the water resistance of the container made of the composition of Example 1, in particular, the water resistance of the container using polylactic acid as the material of the biodegradable film was measured.

The biodegradable film was prepared as follows.

A biodegradable polylactic acid (PLA, glass transition temperature 59 ℃, melting point 175 ℃, flow index = 3.0g / 10min) was prepared by the casting (casting) method. In general, polylactic acid (PLA) is characterized by being transparent, high in strength, having properties similar to those of polyester and polyester, and being biodegradable.

As a method of measuring water resistance, a leak test solution (0.3% of surfactant, 0.1% of blue ink, and 99.6% of water) was poured into a starch container (70 mm in depth, 450 cc in capacity) to check for leakage for 30 minutes.

In other words, it was checked for 30 minutes whether the blue leakage test solution leaked out of the outside of the container through visual inspection.

As a result of the experiment, it could be confirmed that no leakage occurred in the biodegradable film 100 to 300 μm.

According to the present invention, in the biodegradable starch container, there is no sticking phenomenon at the bottom even when cooking in a microwave oven, furthermore, it is possible to ensure sterilization, deodorization function, long-term preservation, release property, and sufficient water resistance easily. The effect that can be obtained is achieved.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Therefore, the scope of the utility model registration claims attached will include such modifications or variations that fall within the spirit of the present invention.

Claims (16)

In the biodegradable starch container, A biodegradable starch container having a protrusion at a bottom of a container, the container having a body and a bottom, molded into a desired shape, and having a protrusion formed at a portion of the bottom. The method of claim 1, wherein the biodegradable starch container, The protrusion is hemisphere; Polygonal pillars; Or a cone; biodegradable starch container having a protrusion at the bottom of the container, characterized in that the shape. The method according to claim 2, wherein the biodegradable starch container, Biodegradable starch having protrusions at the bottom of the container, characterized in that the height of the protrusion is 0.2 ~ 3.0mm, the surface area of the bottom of the protrusion and the bottom surface is 30mm ² or less, the number of such protrusions is 3 to 5. Vessel. The method of claim 1, wherein the biodegradable starch container, Biodegradable starch container composition consisting of 20 to 60 wt% of unmodified starch, 5 to 30 wt% of pulp fiber powder, 30 to 60 wt% of solvent, 0.1 to 2.0 wt% of photocatalyst, 0.01 to 1 wt% of preservative, and 0.5 to 5 wt% of release agent And a biodegradable starch container having a protrusion at the bottom of the container, wherein the container is formed into a desired shape by heating and pressing. The method according to claim 4, wherein the non-modified starch, A biodegradable starch container having protrusions at the bottom of the container, characterized in that it is at least one starch selected from the group consisting of corn, potato, wheat, rice, tapioca and sweet potato. The method of claim 4, wherein the pulp fiber powder, A biodegradable starch vessel having protrusions at the bottom of the vessel, characterized in that the fiber length is 10-200 μm. The method of claim 6, wherein the pulp fiber powder, A biodegradable starch container having a protrusion at the bottom of the container, wherein the hardwood is pulp fiber powder ground. The method of claim 4, wherein the photocatalyst, A biodegradable starch container having protrusions at the bottom of the container, characterized in that the titanium dioxide has an anatase content of at least 70%. The method of claim 4, wherein the photocatalyst, A biodegradable starch container having protrusions at the bottom of the container, wherein at least one metal selected from the group consisting of iron (III), vanadium, molybdenum, niobium and platinum is doped titanium dioxide. The method of claim 4, wherein the photocatalyst, A biodegradable starch vessel having protrusions at the bottom of the vessel, characterized by using metal oxides of silicon dioxide, vanadium pentoxide or tungsten oxide alone or in combination. The method of claim 4, wherein the preservative, A biodegradable starch vessel having protrusions at the bottom of the vessel, characterized in that at least one selected from the group consisting of sorbic acid, potassium sorbate, sodium benzoate, sodium propionate. The method of claim 4, wherein the release agent, A biodegradable starch vessel having protrusions at the bottom of the vessel, characterized in that at least one selected from the group consisting of monostearyl citrate and magnesium stearate. The method of claim 4, wherein the release agent, A biodegradable starch vessel having protrusions at the bottom of the vessel, wherein monostearyl citrate and magnesium stearate are mixed in a weight ratio of 1: 1.5. The method of claim 4, wherein the solvent, A biodegradable starch container having protrusions at the bottom of the container, which is selected from the group consisting of water, alcohol, aqueous alkali solution and acidic aqueous solution. The method of claim 4, wherein the biodegradable film, Protrusions at the bottom of the vessel, characterized in that it comprises at least one selected from the group consisting of polylactic acid, polycaprolactone, polybutyrene succinate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, ester starch and cellulose acetate Biodegradable starch container having a. The method according to claim 15, wherein the biodegradable film, A biodegradable starch container having protrusions at the bottom of the container, wherein the film to be bonded to the container has a thickness of 100 to 300 µm.