KR101612932B1 - Manufacturing method of Cutting board containing salt - Google Patents

Abstract

The present invention relates to a cutting board containing salt, and a producing method thereof and, more specifically, to a cutting board having excellent far-infrared emissivity by treating the cutting board with heat while storing the same in a ceramic vessel. The producing method of a cutting board containing salt comprises: a pre-treatment step of reducing a water content salt pre-treated by any one method selected from heating or drying, after preparing the salt; a salt grinding step of producing salt powder by grinding after preparing 8 to 25 wt% of the pre-treated salt with respect to total cutting board weight; a salt pellet producing step of producing salt pellets by extrusion-forming while applying heat and pressure after preparing thermoplastic resin powder and mixing with the salt powder; and an injection molding step of producing the cutting board by injection-molding while applying heat and pressure after preparing a thermoplastic resin and mixing with the salt pellets.

Description

Technical Field [0001] The present invention relates to a method of manufacturing a salt-

The present invention relates to a method for producing a salt-containing cutting board, and more particularly, to a method for producing a salt-containing cutting board having a high antimicrobial activity, a high harmful heavy metal content and a high far infrared ray emissivity.

Chopping board is a cooking device used for cutting and chopping food, and is made of wood, plastic, synthetic rubber and the like.

Since the board is cooked with direct contact with the food, the moisture contained in the food is exposed to moisture and exposed to moisture even when cutting and chopping the food after washing the board with water.

As a result, the moisture permeates into the inside of the cutting board from the surface of the cutting board through the micro pores of the cutting board, so that the propagation of germs and microorganisms is facilitated and the bacteria are transferred to the foodstuffs contaminated with bacteria and not cooked for a long time. There was a falling problem.

As a technique for solving such a problem, Korean Patent Registration No. 10-1167070 (Patent Document 1) discloses a method for producing a kitchen board and a kitchen board with enhanced antimicrobial activity, which includes a shell- Calcium carbonate) is added at a certain ratio to provide a natural antibacterial and sterilizing and deodorizing effect on the surface of the product while maintaining excellent elasticity and flexibility without causing changes in physical properties in hot water which is a characteristic of thermoplastic polyurethane.

However, according to the technique of Patent Document 1, when fine cutting is generated on the surface of the cutting board, the calcium carbonate, which is a main component of the shell, breaks together and the fine powder is exposed to the outside of the cutting board, There is a problem in that unnecessary calcium carbonate is mixed when the food is handled and the quality of the dish is deteriorated.

That is, it is preferable that the ingredient contained in the antimicrobial properties of the cutting board has the characteristics of a material that should not be at risk when the ingredient is exposed to the outside in the course of the cooking of the food and fed to the human body together with the foodstuff.

As an art for solving these problems, "Antibacterial board" (Korean Utility Model Registration No. 20-0386994, Patent Document 2) describes an antimicrobial board containing salt which is absorbed into human body.

The antimicrobial board of Patent Document 2 is used as a cooking device in order to enhance hygienic and durability by improving the antimicrobial property of a cutting board, which is often exposed to moisture and is contaminated with bacteria or decayed by microorganisms as moisture permeates into the interior. A plurality of salt holes are drilled in the inside of the chopping block, and a certain amount of salt is charged into the salt holes, thereby allowing the salt to spread throughout the chopping block by the water impregnated into the chopping block.

However, in Patent Document 2, there is a manufacturing difficulty in artificially hole-punching a board, and there is a difference in the degree of penetration of salt at a portion far from the portion where the hole is formed, and thus the antibacterial force is not uniform .

KR 10-1167070 (July 13, 2012) KR 20-0386964 (June 7, 2005)

The method for producing a salt-containing cutting board of the present invention is to solve the problems caused by the conventional art as described above. In the process of manufacturing a cutting board using a thermoplastic resin as a raw material, a part of the total weight of the resin is mixed with the salt powder, The salt pellets are formed and then injection-molded together with the remaining amount of the resin, so that the salt is uniformly dispersed despite the difference in specific gravity, so that the antibacterial performance can be uniformly generated in the entire area of the cutting board.

In addition, the salt is pretreated by any one of drying or heating process, so that the pellet is made into a salt pellet with minimized moisture content, thereby minimizing pore formation caused by moisture evaporation in the extrusion and extrusion processes, .

In addition, the pretreated salt is pulverized into nano-sized particles and made into a salt pellet so as to be highly distributed on the surface of the cutting board so that the surface of the cutting board can exhibit a satisfactory antibacterial performance even when it is worn out due to cutting.

Further, as the nano-sized particles are uniformly distributed, the surface of the cutting board is smoothly formed, so that the water repellent performance can be exerted without a separate water repellent coating.

In addition, it is intended to enable the sterilizing ability of sulfur to be exerted by adding a small amount of sulfur powder to the process of producing salt pellets.

In addition, the pretreatment process of the salt is intended to provide a sanitary sanitary ware by removing the heavy metals and harmful organic substances contained in the salt by melting and recrystallization after heating.

In addition, it is intended to provide a board having excellent far-infrared ray emissivity due to being heat-treated while being housed in a ceramic container.

In order to solve the above problems, a method of manufacturing a salt-containing cutting board of the present invention comprises a pretreatment step of preparing a salt and then reducing the moisture content of the salt prepared by pre-treating it by heating or drying; 8 to 25% by weight of the pretreated salt is prepared and pulverized to produce a salt powder; Preparing a thermoplastic resin powder, mixing the powder with the salt powder, and applying heat and pressure to form a salt pellet by extrusion molding; Preparing a thermoplastic resin, mixing the pellet with the salt pellet, and applying injection molding to the thermoplastic resin by applying heat and pressure.

In this construction, the salt powder and the thermoplastic resin powder are mixed at a weight ratio of 1: 1 to 2 in the step of preparing the salt pellets.

The salt milling step is characterized in that the pretreated salt is pulverized to a size of 1 to 5 nm.

In addition, the step of preparing the salt pellets is characterized in that 0.01 to 0.99% by weight of sulfur is further added to 100% by weight of the whole cutting board, followed by extrusion molding.

The salt-containing cutting board of the present invention is characterized in that it comprises 8 to 25% by weight of the total weight of the salt powder produced by the above-mentioned production method and dried or heated and pulverized.

According to the present invention, a part of the total weight of the resin mixed with the salt powder is extrusion-molded to produce a salt pellet and then injection-molded together with the remaining resin in the process of manufacturing a cutting board made of a thermoplastic resin as a raw material, Even though the salt is evenly dispersed, the antibacterial performance can be evenly distributed over the entire area of the cutting board.

In addition, the salt is pretreated by any one of drying or heating process, so that the pellet is made into a salt pellet with minimized moisture content, thereby minimizing pore formation caused by moisture evaporation in the extrusion and extrusion processes, Can be minimized.

In addition, the pretreated salt is pulverized into nano-sized particles and is made into a salt pellet so that it is highly distributed on the surface of the cutting board, so that the antimicrobial performance can be excellently demonstrated even when the cutting surface is worn out by cutting.

Further, as the nano-sized particles are evenly distributed, the surface of the cutting board is smoothly formed, so that the water repellent performance can be exhibited without a separate water repellent coating.

In addition, by adding a small amount of sulfur powder to the process of producing salt pellets, the sterilizing ability of sulfur can be demonstrated.

In addition, the pretreatment process of the salt is carried out by heating and then recrystallization is performed to remove the heavy metals and harmful organic substances contained in the salt, thereby providing a sanitary cutting board.

In addition, since the heat treatment is carried out while being housed in the ceramic container, a board having an excellent far-infrared ray emissivity is provided.

FIG. 1 is a photograph of a test report showing the result of a far-infrared ray test conducted on an embodiment of the present invention. FIG.
Fig. 2 is a photograph of the test report showing the test result of the antibacterial activity test according to the embodiment of the present invention. Fig.
Fig. 3 is a photograph of the test report showing the results of the antibacterial activity measurement test for the comparative example in the present invention. Fig.
FIG. 4 is a photograph of a test-feeling image showing a result of heavy metal measurement test according to an embodiment of the present invention. FIG.
FIG. 5 is a photograph showing salt pretreated in the present invention. FIG.
6 is a photograph showing a salt pellet in the present invention.

Hereinafter, a method for producing a salt-containing cutting board of the present invention will be described in detail.

1. Pre-processing step

After preparing the salt, it is pretreated by either heating or drying to make the moisture content of the salt be 0 to 0.99% by weight of 100% by weight of the whole salt.

At this time, the pretreated salt is prepared so as to contain 8 to 25% by weight of 100% by weight of the prepared cutting board.

If the amount of dried salt is less than 8%, the salt may not be evenly dispersed and contained. Therefore, a uniform antibacterial quality may not be maintained, and when the amount exceeds 25%, the physical properties of the cutting board may be deteriorated .

At this time, it is most preferable that 10 to 11% of salt is contained in order to maintain the characteristics of the optimized board.

The drying can be carried out by a room temperature drying method or a drying method in a hot air drying chamber.

When the method of heating is used, not only water but also unnecessary foreign substances such as heavy metals contained in the salt can be separated.

In this method, the salt is placed in a ceramic or metal container, and then the container is heated to a high temperature.

The heating temperature can be optionally selected.

For example, if unnecessary organic matter is removed, the organic material can be carbonized even at a low temperature of less than 400 ° C., and then the carbide can be removed using the specific gravity difference.

As a method for removing heavy metals, there is a method in which the salt is heated to a molten state in which the salt is liquefied by heating to a temperature of more than 800 ° C, which is the melting point of sodium chloride, which is a main component of the salt, and less than 1413 ° C, The mercury and cadmium having characteristics are separated by vaporization, and the raw materials having a large specific gravity such as other lead can be separated and precipitated using the specific gravity difference.

In this case, it is more preferable that the container in which the salt is loaded at the time of heating is composed of a material having a property of exchanging ions with heavy metals at a high temperature.

For example, it has been known that quartz, cryptomeric, and manganox are excellent in heat resistance at high temperatures, large number of fine pores per unit volume, large adsorption capacity, and ion exchange with heavy metals, thereby eliminating harmful metals.

That is, when the container is constituted of a ceramic container having an exhaust port formed on the upper part containing the above-mentioned mineral substance and heated to a temperature of about 850 to 1050 ° C, mercury or cadmium is vaporized and exhausted through the exhaust port, The same heavy metals can be removed by ion exchange.

The chemical constituents of the recrystallized salt after heating by this method are approximately 95 to 98% by weight of sodium chloride, 0.06 to 0.08% by weight of sodium oxide, 0.02 to 0.04% by weight of magnesium oxide, 0.01 to 0.03% by weight of potassium oxide, 0.02 0.01 to 0.02% by weight of aluminum oxide, 0.01 to 0.02% by weight of iron oxide, 0.002 to 0.003% by weight of calcium oxide, and 0.01 to 0.02% by weight of rare rare trace elements.

2. Grinding step

The pretreated salt is pulverized.

At this time, it is preferable that the size of the pulverized salt particles is a very small size of less than 1 mm.

When the salt particles are large, when the salt particles located on the surface, not on the inside of the cutting board, are dissolved in contact with water, there arises a problem that the surface of the cutting board becomes uneven when dissolved.

In addition, in order to increase the antimicrobial activity of salt, it is necessary to uniformly disperse the salt in the surface and inside of the cutting board as much as possible, and when the salt is used in an excess amount, problems such as compressive strength, tensile strength, bending strength, have.

In addition, since the extrusion molding temperature of the thermoplastic resin is much lower than the melting temperature of the salt, the salt is extrusion-molded in a state in which it is not liquefied.

That is, salt is distributed as much as possible in an area or volume as much as possible without excessive use of salt, so that excellent antibacterial power can be exhibited while preventing property deterioration.

The optimal size of the salt particles for this purpose is preferably 1 to 5 nm.

3. Step of preparing salt pellets

The salt powder and the thermoplastic resin powder after the pulverization step are prepared and mixed, and a pellet-shaped salt pellet is produced through an extruder.

At this time, the thermoplastic resin powder is preferably composed of any one selected from low-density polyethylene, ABS resin and the like.

The mixing may be carried out in a separate mixing stirrer or in an extruder.

At this time, the salt powder and the thermoplastic resin powder are preferably mixed at a weight ratio of 1: 1 to 2, and a weight ratio of 1: 1.5 is most suitable.

That is, if the pretreated salt powder contains 8% of the total board weight, the thermoplastic resin included in the preparation of the salt pellet will be 8 to 16%, and when 25% of the salt powder is contained in the salt pellet, The thermoplastic resin is 25 to 50%.

In addition, when 10 to 11% of salt is included, the thermoplastic resin included in the salt pellet production is most preferably 15% to 16.5%.

As a raw material for maximizing the antimicrobial activity of the cutting board in the step of producing the salt pellets, a salt powder and a sulfur powder may be further included.

The sulfur powder is also preferably pulverized to a size of 1 to 5 nm like a salt powder, and the content thereof is preferably 0.01 to 0.99% by weight based on 100% by weight of the whole cutting board.

Sulfur reacts with organic substances to form pentatitanic acid, which is known to dissolve the skin's keratin to kill and kill bacteria.

The salt pellets prepared as described above contain 8 to 75% by weight based on 100% by weight of the whole cutting board, 15 to 16.5% of the thermoplastic resin pellets based on 10 to 11% 27.5% by weight.

When sulfur is included, it becomes 25.01 ~ 28.49%.

In addition, the extruded salt pellets should be about 1 to 5 mm in size.

In the case of molding the salt pellets as described above, when the thermoplastic resin and the salt are mixed and the injection molding is performed by applying heat and pressure, the mixture is not evenly mixed due to the difference in specific gravity during the process of being injected into the mold after mixing, And to prevent the uniform distribution of the particles from becoming poor.

4. Resin Pellet Preparation Step

A thermoplastic resin such as polyethylene or ABS resin is prepared and put into an extruder to prepare pellet-shaped resin pellets.

At this time, the resin pellets may have the same size as the salt pellets.

However, since the salt pellets contain salt having a larger mass per unit volume than polyethylene or ABS resin, the resin pellets may be lighter in weight than the salt pellets when they are formed in the same size. In this case, Even mixing may not be achieved.

Accordingly, it is preferable that the resin pellets are 0.5 to 2 mm larger than the salt pellets.

5. Injection molding step

The prepared salt pellets and the resin pellets are mixed and stirred, and then supplied to the mold as a raw material, which is injection-molded into a chopping shape by applying heat and pressure.

The mixing may be performed in a separate cylindrical or screw-type mixing agitator, and mixing may be performed in the screw-type supply pipe in the course of feeding the raw material into the injection molding machine.

The board containing the salt prepared by the above process is characterized in that 8 to 25% of the total weight of the ground salt after pretreated by the drying or heating method is contained.

In general, cutting boards made of synthetic resin such as polyethylene or ABS are repeatedly cut on the surface of a cutting board during use, resulting in forming numerous small grooves on the cutting board surface.

In the course of repeated use, the food is impregnated into the grooves, and it is difficult to clean the grooved food with a common dish tool such as a toothpick.

A typical example is when kimchi is put on a cutting board and the kimchi broth is impregnated on the cutting board, and it is difficult to remove the irregularity when doing the sake.

Particularly, as the use period of the cutting board increases, the more the groove is formed, the more such unevenness is generated and it is not washed well.

As the grooves are difficult to remove and the water is difficult to remove, the grooves are in an environment where various germs and fungi can easily be inhabited. In fact, when old cutting boards are not easy to remove water, molds are generated in these areas do.

However, in the present invention having the above-described structure, the salt is primarily extruded together with the thermoplastic resin to be salt-pelletized, so that the salt is dispersed as uniformly as possible on the inside and the surface of the cutting board, When it is formed, the salt dispersed evenly is exposed, and it acts to prevent fungus and bacteria from being formed by the antibacterial power of the salt itself.

In particular, as the use period of the cutting board is increased, the salt is exposed through the groove every time a new groove is formed, so that the antibacterial power is provided, and the antibacterial power can be continuously provided even when the cutting board is worn by use .

In order to satisfy this principle, it is necessary to maintain the physical and chemical properties of the basic cutting board as well as to have a high density of salt as much as possible.

Therefore, in the present invention, salt is extruded together with a resin to prepare a salt pellet, and then mixed with the resin pellets to perform injection molding. In this method, salt which is not a common salt and has a maximum moisture content is used, And recrystallization after melting to remove various organic and metallic impurities. By minimizing the size of the recrystallized salt to a nanometer level, it is highly dispersed and evenly distributed on a cutting board, so that whenever a lot of fine grooves are formed on a cutting surface, nano- It is possible to maintain the antimicrobial persistence by providing the antimicrobial power when the particles are exposed.

In addition, since nano-sized salt particles are included, the surface of a manufactured board can be smoothly formed without any additional surface processing, and water repellent functionality can be ensured naturally.

Hereinafter, embodiments of the present invention will be described.

The salt was prepared by purchasing and preparing a salt of mannitol in the market, putting it into a hot-air drying furnace, and drying it so that the water content became 0.5% by weight of the total weight of the salt.

The pretreated salt was pulverized and passed through a sieve having a size of 1 mm in width and length, and the salt passed therethrough was prepared.

The polyethylene powder was mixed with the ground salt powder in a weight ratio of 1: 1. The mixture was extruded into an extruder, heated at a temperature of 115 ° C while being extruded under a pressure of 2 mm in diameter, 160 g of 4 mm salt pellets were prepared by weighing.

Separately, polyethylene powder was prepared and extruded in a cylindrical shape having a diameter of 3 mm, and cut at intervals of 5 mm to prepare 840 g of resin pellets having a diameter of 3 mm and a length of 5 mm.

160 g of the prepared salt pellets and 840 g of resin pellets were mixed, and the mixture was charged into a raw material of an injection mold for forming a chipping shape, and heat and pressure were applied to produce a cutting board of Example 1.

Proceed in the same manner as in Example 1,

The pulverized salt powder and the polyethylene powder were mixed at a weight ratio of 1: 2 and extrusion molded to prepare 240 g of the salt pellets. The resin pellets were prepared by weighing 760 g of the resin pellets, followed by injection molding. Respectively.

The procedure of Example 1 was followed except that the pulverized salt powder and the polyethylene powder were mixed at a weight ratio of 1: 1.5 and extruded to prepare 250 g of the salt pellets by weighing. 750 g of the resin pellets were weighed and prepared, Followed by molding to produce a board of Example 3. [

The procedure of Example 3 was followed except that the pulverized salt powder and polyethylene powder were mixed at a weight ratio of 1: 1.5 and extruded to prepare 275 g of the salt pellets. The resin pellets were prepared by weighing 725 g of the resin pellets, Followed by molding to prepare a board of Example 4. [

After drying the sun-dried salt, the sun-dried salt was dried to a sunlight, and thereafter, a mixture of 32% by weight of elvan, 32% by weight of Mung Moonite, 2% by weight of bentonite, 10% by weight of feldspar, 8% by weight of silica, 9% The heat-resistant container was put in a kiln after covering the lid formed on one side of the exhaust port, gradually heated to a temperature of 1050 ° C in the kiln, maintained for 6 hours in that state, and then cooled to room temperature And then recrystallized salt was obtained.

Prior to the preparation, the sodium chloride concentration was 88% by weight and the water content was 3% by weight. The chemical composition of the recrystallized salt was 97% by weight of sodium chloride, 0.072% by weight of sodium oxide, 0.0342% by weight of magnesium oxide, 0.0254% , 0.0247% by weight of silicon dioxide, 0.0157% by weight of aluminum oxide, 0.009% by weight of iron oxide, 0.0022% by weight of calcium oxide, 0.0001% by weight of water and the balance of rare trace elements.

The prepared salt was prepared by pulverizing and filtering so that the particle size was 2 to 3 nm in width and length.

Using the thus prepared salt powder, a board of Example 5 was prepared in the same manner as in Example 3.

The procedure of Example 5 was followed except that sulfur was prepared and pulverized to 2 to 3 nm in width and 0.5 g was added in the production of salt pellets to prepare salt pellets and injection molding using the salt pellets to produce a board of Example 6 .

The procedure of Example 3 was followed except that the salt pellets and the ABS resin instead of polyethylene were used in the production of the resin pellets to prepare the board of Example 7. [

≪ Comparative Example 1 &

In order to compare with the above-mentioned embodiments, 80 g of salt and 920 g of polyethylene pellets were mixed and injection-molded into a cutting board to produce a board of Comparative Example 1.

≪ Comparative Example 2 &

The procedure of Comparative Example 1 was followed except that 160 g of salt and 840 g of polyethylene pellets were mixed and injection-molded into a cutting board to produce a cutting board of Comparative Example 2.

≪ Comparative Example 3 &

50 g of salt and 75 g of polyethylene powder were mixed and extrusion molded to prepare salt pellets. 875 g of polyethylene pellets were prepared, mixed with each other and injection molded to produce a board of Comparative Example 3.

≪ Comparative Example 4 &

300 g of salt and 450 g of polyethylene powder were mixed and extruded to prepare salt pellets. 250 g of polyethylene pellets were prepared, mixed with each other, and injection-molded to produce a board of Comparative Example 4. [

<Experimental Example 1> Physical property test

The boards prepared in Examples 1 to 7 and Comparative Examples 1 to 4 were tested by the respective test methods shown in the following table to measure their physical properties.

The results are shown in Table 1 below.

division The tensile strength
(Test method: D695)
(Unit: kg / cm2)
Flexural modulus (rigidity)
(Test method: D790)
(Unit: kg / cm2) Example 1 123 9,500 Example 2 115 12,500 Example 3 130 11,300 Example 4 129 11,600 Example 5 131 11,600 Example 6 130 11,000 Example 7 350 22,000 Comparative Example 1 84 8,100 Comparative Example 2 65 8,400 Comparative Example 3 93 7,300 Comparative Example 4 53 5,500

As shown in Table 1, it can be seen that Examples 1 to 6 of the present invention are in the range of the normal tensile strength and flexural modulus of the polyethylene injection product as the main material.

It can also be seen that the case of Example 7 is also comprised of a range of ordinary tensile strength and flexural modulus of the main ABS resin article.

On the other hand, in the case of a board manufactured without pelletizing salt as in Comparative Examples 1 and 2, the tensile strength and flexural modulus of a conventional polyethylene injection product, when used in excess or in small amounts even when pelletized, , Respectively.

As a result, it can be seen that when salt is simply added in the injection molding process as in Comparative Examples 1 and 2, the kneading quality of the kneading machine does not have appropriate tensile strength and flexural modulus, which is unsuitable.

In addition, even if pelletization is carried out using salt and resin as in Comparative Examples 3 to 4, it can be seen that the physical properties are inadequate even when the pretreatment by drying or heating is not carried out.

It is considered that the moisture contained in the salt evaporates during the injection molding process of applying heat, thereby forming irregular pores and degrading the physical properties of the board.

<Experimental Example 2> Sensory test on the distribution of salt

Whether or not the salt was evenly distributed on the boards prepared according to Examples 1 to 7 and Comparative Examples 1 to 4 was evaluated using a 9-point scale method.

The evaluation method was to evaluate the uniformity of tongue taste and tongue tongue by applying tongue to 10 points of arbitrary points on the board. The results are shown in Table 2 below.

Whether the salty taste appears evenly division Whether the salty taste appears evenly Example 1 7.2 Example 2 7.7 Example 3 7.5 Example 4 7.5 Example 5 8.8 Example 6 8.7 Example 7 7.9 Comparative Example 1 3.5 Comparative Example 2 3.6 Comparative Example 3 5.1 Comparative Example 4 5.6

* Sensory test value (9: uniformly distributed salty, 5: normal, 0: salty taste not evenly distributed)

As shown in Table 2, in Examples 1 to 7, the salty taste was evenly distributed over the entire cutting board as compared with Comparative Examples 1 to 4, indicating that the distribution of salt was evenly distributed.

Among the same examples, the distribution of salty taste was evenly distributed in Examples 5 and 6 in which the salt was recrystallized and then nanoized.

In Comparative Examples 3 and 4, in which the salt pelletizing process was carried out, the results were more uniform than those of Comparative Examples 1 and 2, but were still lower than those of Examples.

It is considered that this is due to the fact that the process such as the particle size of the salt and the pretreatment of the salt is excluded.

<Experimental Example 3> Far-infrared radiation test

The far infrared ray emission test of the board prepared in Example 4 was carried out.

The manufacture of the laminate was commissioned by the applicant of the present invention to the representative of KEPCO KEPCO (KEPCO). The test was commissioned by KEPCO (KIFA), a representative of KEPCO, The results are shown as the results of measurement of the black body using an FT-IR spectrometer at 37 ° C according to the method.

The measurement result of the far infrared ray emissivity of the board compared to the black body Emissivity (5 to 20 탆) 0.889 Radiant energy (W / m2 占 퐉, 37 占 폚) 3.43 x 10 ²

As shown in Table 3, it can be seen that the board according to the present invention exhibits a similar emissivity to a black body.

This effect is judged to be based on the material properties of the heat-resistant container in which the firing is performed.

&Lt; Experimental Example 4 >

The board of Example 6 was commissioned by SGS as a test institute and subjected to an antibacterial test according to JIS Z 2801: 2000E (Japan Industrial Standards).

Two strains of Esherichia coli ATCC 8739 and STaphylococcus aureus ATCC 6538P were used as the test strains. The culture conditions were as follows.

As a result, the antibiotic activity rate (Antibacterial activity rate) was 6.0 and the antibacterial activity was 99.99%.

In addition, the same experiment was conducted on the cutting board of Comparative Example 3. As a result, the antibacterial activity value was 0.1 for the test strain Esherichia coli ATCC 8739, 0.1 for the test strain 3, and 0.1 for the test strain STaphylococcus aureus ATCC 6538P The antibacterial activity value was 0 in all of the first to third stages.

The maximum antimicrobial activity measured was 13.63%.

This is considered to be due to the fact that the board of Example 6 is uniformly dispersed and dispersed in salt.

<Experimental Example 5> Heavy metal detection test

An analysis of cadmium and lead was conducted according to IEC 62321-5: 2013 in accordance with IEC 62321-5: 2013, and the test was conducted according to IEC 62321-4 : 2013 was measured by inductively coupled plasma spectrometer.

In addition, the hexavalent chromium was measured by absorption spectrometry according to IEC 62321: 2008.

As a result, the metals were found to be undetected.

&Lt; Experimental Example 6 >

A drop of water was dropped on the board of Example 5 to observe the state.

Visual observation The water droplet kept its shape, and as a result of tilting the board, it fell down.

As a result, it was found that when the nano-sized salt powder was used as in Example 5, it had hydrostatic power.

Claims (5)

In a method of manufacturing a cutting board,
A pretreatment step of preparing salt and then heating it to a temperature higher than 800 ° C and lower than 1413 ° C to reduce the moisture content of the prepared salt;
10 to 11% by weight of the pretreated salt is prepared in a weight of 1 to 5 nm to prepare a salt powder;
Preparing a thermoplastic resin powder and mixing it with the salt powder, mixing the salt powder and the thermoplastic resin powder at a weight ratio of 1: 1 to 2, followed by extrusion molding under heat and pressure to prepare a salt pellet;
A thermoplastic resin in a remaining amount of 100% by weight of the entire cutting board is prepared and put into an extruder to prepare a pellet-shaped resin pellet having a size 0.5 to 2 mm larger than the above-mentioned salt pellets. The resin pellets are prepared and mixed with the salt pellets, And an injection molding step for producing a cutting board,
A method for producing a salt-containing cutting board.
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