KR101915785B1 - Biodegradable resin foam sheet, preparation method thereof and the tray for packing food using the same - Google Patents

Abstract

The present invention relates to a biodegradable resin foam sheet, a preparation method thereof, and a tray for packing food using the same. According to the present invention, a foaming mixture obtained by mixing a polymer resin, a biodegradation agent, a crosslinking agent, crosslinking auxiliary agent, a compatibilizer, an oxidation promoter, a heat transfer promoter, a freshness maintenance composition, an antimicrobial composition, and an antioxidant composition is prepared to form a foamed body; and the foamed body is extruded to form a sheet to obtain the biodegradable resin foam sheet. The tray for packing food uses the biodegradable resin foam sheet, so as to improve the freshness, safety, and cleanliness of food through the antimicrobial, antioxidant, and freshness maintenance functions of the biodegradable resin foam sheet.

Description

TECHNICAL FIELD [0001] The present invention relates to a biodegradable foam sheet, a method of manufacturing the same, and a tray for food packaging using the same. BACKGROUND ART [0002]

The present invention relates to a polymer resin; Biodegradation agents; A crosslinking agent; Crosslinking auxiliary; Compatibilizers; Oxidation promoters; Biodegradable heat transfer promoters; Freshness-maintaining composition; An antimicrobial composition; A biodegradable foam sheet obtained by preparing a foam by using a foaming mixture prepared by mixing a foaming composition and an antioxidant composition and extruding the foamed product to prepare a sheet,

A method of producing the biodegradable foam sheet,

The present invention relates to a food packaging tray capable of improving the freshness, safety, and cleanliness of a food by using the biodegradable foamed sheet to prevent antibacterial, antioxidation and freshness.

Generally, the product will be packaged. This is to protect the product from being deteriorated by protecting it from physical and chemical damage, corruption or pollution that may occur during transportation and storage, and to improve the value of the product by emphasizing the design aspect .

Especially, the packaging of food materials is aimed at the purpose of protection from various pests and delay of corruption rather than emphasizing design side.

The present invention relates to a food packaging tray, which is widely used for meat packaging, and which can meet the purpose of freshness, cleanliness and decay of food, and which can solve the environmental pollution problem through biodegradation. .

In connection with the present invention, Korean Patent Registration No. 10-1396528 (Registration Date 2014.05.12) 'Seedling container made of biodegradable foam sheet and method of manufacturing the same'; Korean Registered Patent No. 10-0689270 (Registered on Feb. 23, 2007) 'Environmentally friendly biodegradable foam sheet and its manufacturing method'; Korean Registered Patent No. 10-1376642 (Registered on Apr. 14, 2014) 'Biodegradable Resin Foam Sheet, Biodegradable Resin Foam and Biodegradable Resin Molded Container'; Korean Patent No. 10-1299358 (Registration date 2013.08.16) 'Biodegradable sheet having a foam layer'; Korean Patent No. 10-0923833 (registered date 2009.10.20) 'Biodegradable resin cross-linked continuous foam sheet and method for manufacturing the same'; Korean Patent No. 10-1438032 (Registration Date 2014.08.29) discloses a biodegradable polylactic acid polymer blend composition having excellent compatibility, a heat-resistant extruded foam sheet using the same, and a foamed molded article prepared therefrom.

Also, Korean Utility Model Registration No. 20-0468938 (Registration date 2013.09.03) 'Food packaging tray and food packaging container containing it'; 'Food packaging tray'; Registered Korea Utility Model 20-0469280 (Registration date 2013.09.26) 'Food packaging tray and food packaging container containing it'; Korean Registered Patent No. 10-0786171 (registered date 2007.12.10) 'Monosaccharide using antimicrobial master batch and food tray using the same'; Korean Patent Laid-Open No. 10-2015-0125052 (Publication date 2015.11.09) 'Foaming tray for food packaging and its manufacturing method'; Korean Patent Laid-Open No. 10-2012-0135559 (Publication Date 2012.12.17) 'Foaming tray for food packaging excellent in moisture absorption and method for manufacturing the same'; Korean Patent Laid-Open Publication No. 10-2016-0140269 (Publication date 2016.12.07) discloses a technique for 'oil and water-absorbing food packaging material, a method for manufacturing the same, and a tray using the same.

The conventional patented technologies for food packaging are not suitable for satisfying the function of biodegradation function, improvement of freshness of food, improvement of safety and cleanliness.

Accordingly, the present invention provides a food packaging tray capable of maintaining freshness, delaying decay, and maintaining cleanliness in packaging food materials such as meat while eliminating the environmental pollution problem through biodegradation, and also provides a food packaging tray for biodegradation To provide a foam sheet and a manufacturing method thereof.

Korean Registered Patent No. 10-1396528 (Registration date 2014.05.12) Korean Registered Patent No. 10-0689270 (Registered on Feb. 23, 2007) Korean Registered Patent No. 10-1376642 (Registration date 2014.03.14) Korean Registered Patent No. 10-1299358 (Registration date 2013.08.16) Korean Registered Patent No. 10-0923833 (registered date 2009.10.20) Korean Registered Patent No. 10-1438032 (Registration date 2014.08.29)

The present invention relates to a polymer resin; Biodegradation agents; A crosslinking agent; Crosslinking auxiliary; Compatibilizers; Oxidation promoters; Biodegradable heat transfer promoters; Freshness-maintaining composition; An antimicrobial composition; An antioxidant composition; a foamed product obtained by preparing a foamed product using a foamed mixture prepared by mixing the foamed product and extruding the foamed product to prepare a foamed sheet;

A method of producing the biodegradable foam sheet,

It is an object of the present invention to provide a food packaging tray capable of improving the freshness, safety and cleanliness of foods by antibacterial, antioxidant and freshness-retaining functions by using the biodegradable foam sheet.

In order to achieve the above object,

The present invention relates to a polymer resin (a) which is a mixture of any one or more selected from polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyacrylic, ethylene vinyl acetate or thermoplastic resin of polyvinyl chloride. 40.0-95.0 wt %;

Polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS), poly (butylenes adipate-co-terephthalate) 0.5 to 30.0 wt% of a biodegradable agent (b) which is a mixture of any one or two selected from the group consisting of polyvinyl alcohol,

0.5 to 5.0 wt% of a crosslinking agent (c) of Dicumyl peroxide (DCP);

0.5 to 5.0 wt% of a crosslinking aid (d) of zinc oxide (ZnO);

A compatibilizer of stearic acid (e) 0.1 to 10.0 wt%;

0.1 to 30.0 wt% of an oxidation promoter (f) of cerium stearate;

Biodegradation agent of aluminum nitride Heat transfer promoter (g) 0.1 to 20.0 wt%;

1.0 to 20.0 wt% of freshness-maintaining composition (h) of 100.0 wt% composed of 20.0 to 50.0 wt% of Baicin Seed extract, 20.0 to 50.0 wt% of onion extract and 20.0 to 50.0 wt% of mistletoe extract;

(I) 1.0 to 20.0 wt% of an antimicrobial composition comprising 100.0 wt% of a mixture of 20.0 to 50.0 wt% of grapefruit seed extract, 20.0 to 50.0 wt% of an extract of Omiza, and 20.0 to 50.0 wt% of a grape seed extract;

1.0 to 20.0 wt% of the antioxidant composition (j) composed of 20.0 to 50.0 wt% of the Rhus verniciflua extract, 20.0 to 50.0 wt% of the oilseed rape extract and 20.0 to 50.0 wt% of the purple sweet potato extract, (a + b + c + d + e + f + g + h + i + j)

To the mixture was added a foaming agent of Azodicarbonamide (ADCA), and the mixture was added by 90.0 to 99.0 wt% and 1.0 to 10.0 wt% of a foaming agent so as to be foamed to form a foam, And a biodegradable foam sheet made of a sheet.

Also, the sheet provides a biodegradable foam sheet formed by using a punching device so as to form a plurality of holes on one side thereof, but not completely penetrate the sheet.

As a method of producing the biodegradable foamed sheet,

40.0 to 95.0 wt.% Of a polymeric resin (a) which is a mixture of any one or more selected from the group consisting of polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyacrylic, ethylene vinyl acetate or polyvinyl chloride;

Polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS), poly (butylenes adipate-co-terephthalate) 0.5 to 30.0 wt% of a biodegradable agent (b) which is a mixture of any one or two selected from the group consisting of polyvinyl alcohol,

0.5 to 5.0 wt% of a crosslinking agent (c) of Dicumyl peroxide (DCP);

0.5 to 5.0 wt% of a crosslinking aid (d) of zinc oxide (ZnO);

A compatibilizer of stearic acid (e) 0.1 to 10.0 wt%;

0.1 to 30.0 wt% of an oxidation promoter (f) of cerium stearate;

Biodegradation agent of aluminum nitride Heat transfer promoter (g) 0.1 to 20.0 wt%;

1.0 to 20.0 wt% of freshness-maintaining composition (h) of 100.0 wt% composed of 20.0 to 50.0 wt% of Baicin Seed extract, 20.0 to 50.0 wt% of onion extract and 20.0 to 50.0 wt% of mistletoe extract;

(I) 1.0 to 20.0 wt% of an antimicrobial composition comprising 100.0 wt% of a mixture of 20.0 to 50.0 wt% of grapefruit seed extract, 20.0 to 50.0 wt% of an extract of Omiza, and 20.0 to 50.0 wt% of a grape seed extract;

1.0 to 20.0 wt% of the antioxidant composition (j) composed of 20.0 to 50.0 wt% of the Rhus verniciflua extract, 20.0 to 50.0 wt% of the oilseed rape extract and 20.0 to 50.0 wt% of the purple sweet potato extract, (a + b + c + d + e + f + g + h + i + j)

(S10) of first kneading the polymer resin (a) and the biodegradable agent (b) at 95 to 105 ° C for 1 to 5 minutes (sec)

(C), a crosslinking auxiliary (d), a compatibilizing agent (e), an oxidizing accelerator (f) and a biodegradation agent heat transfer promoter (g) are added to the mixture after the primary kneading process. (S20) of secondary kneading for a minute (sec)

Adding the freshness-maintaining composition (h), the antimicrobial composition (i) and the antioxidant composition (j) to the mixture after the second kneading process and then performing a third kneading at 80 to 90 ° C for 3 to 10 minutes S30)

The blowing agent of Azodicarbonamide (ADCA) was added to the final mixture after the third kneading process, and the mixture for the foaming was added so that the blending ratio of the final blend of 90.0 to 99.0 wt% and the foaming agent of 1.0 to 10.0 wt% (Step S40)

Heating the mixture for foaming at 150 to 160 ° C. under a pressure of 12 to 18 MPa for 30 to 50 minutes using a hydraulic electric heating press to remove the pressure instantaneously and foaming (S50)

And a step (S60) of extruding the foam produced through the foaming process to form a sheet (S60).

And forming a plurality of holes on one side of the sheet using a punching device so that the sheet does not completely penetrate the sheet.

The biodegradable foamed sheet is heated to form a tray structure in the mold.

A food receiving portion 10 having a rectangular container structure for receiving food,

And a plurality of water absorption holes (101) formed on a bottom surface of the food accommodation part (10)

The water absorption hole (101) has a circular or polygonal shape with a diameter of 1.2 to 1.8 mm.

The biodegradable foam sheet according to the present invention and the food packaging tray manufactured using the biodegradable foam sheet have the following effects.

first. Because it has excellent biodegradation function, it can be completely decomposed by water, carbon dioxide and biomass in the landfill and nonflooding state even if it is used for food packaging and then discarded, which is eco-friendly.

second. The present invention has an advantage that freshness and hygienic condition of the foodstuff to be packaged in the food packing tray can be maintained well by providing antibacterial, antioxidant, and freshness-retaining functionality using natural extracts.

1 is a perspective view of a biodegradable foam sheet according to a first embodiment of the present invention;
2 is a perspective view of a biodegradable foam sheet according to a second embodiment of the present invention.
3 is a flow chart of a production process of a biodegradable foam sheet according to the present invention.
4 is a perspective view of a food packaging tray manufactured using the foam sheet according to the present invention.
5 is a front view of a food packaging tray manufactured using the foam sheet according to the present invention.
6 is a side sectional view of a food packaging tray manufactured using the foam sheet according to the present invention.
7 is a photograph of an actual product of a food packaging tray manufactured using the foam sheet according to the present invention.

Hereinafter, the technical construction according to the present invention will be described in detail.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A biodegradable foam sheet according to the present invention, a method for manufacturing the same, and a food packaging tray using the same will be described with reference to the drawings.

<Biodegradable foam sheet>

1 and 2 show a biodegradable foam sheet 100, 100 'according to the present invention,

40.0 to 95.0 wt.% Of a polymeric resin (a) which is a mixture of any one or more selected from the group consisting of polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyacrylic, ethylene vinyl acetate or polyvinyl chloride;

Polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS), poly (butylenes adipate-co-terephthalate) 0.5 to 30.0 wt% of a biodegradable agent (b) which is a mixture of any one or two selected from the group consisting of polyvinyl alcohol,

0.5 to 5.0 wt% of a crosslinking agent (c) of Dicumyl peroxide (DCP);

0.5 to 5.0 wt% of a crosslinking aid (d) of zinc oxide (ZnO);

A compatibilizer of stearic acid (e) 0.1 to 10.0 wt%;

0.1 to 30.0 wt% of an oxidation promoter (f) of cerium stearate;

Biodegradation agent of aluminum nitride Heat transfer promoter (g) 0.1 to 20.0 wt%;

1.0 to 20.0 wt% of freshness-maintaining composition (h) of 100.0 wt% composed of 20.0 to 50.0 wt% of Baicin Seed extract, 20.0 to 50.0 wt% of onion extract and 20.0 to 50.0 wt% of mistletoe extract;

(I) 1.0 to 20.0 wt% of an antimicrobial composition comprising 100.0 wt% of a mixture of 20.0 to 50.0 wt% of grapefruit seed extract, 20.0 to 50.0 wt% of an extract of Omiza, and 20.0 to 50.0 wt% of a grape seed extract;

1.0 to 20.0 wt% of the antioxidant composition (j) composed of 20.0 to 50.0 wt% of the Rhus verniciflua extract, 20.0 to 50.0 wt% of the oilseed rape extract and 20.0 to 50.0 wt% of the purple sweet potato extract, (a + b + c + d + e + f + g + h + i + j)

To the mixture was added a foaming agent of Azodicarbonamide (ADCA), and the mixture was added by 90.0 to 99.0 wt% and 1.0 to 10.0 wt% of a foaming agent so as to be foamed to form a foam, (Sheet). (Fig. 1)

Further, a plurality of holes may be formed on the sheet in the extrusion process (Figure 2). [

The hole may be formed at the stage of manufacturing the sheet or may be formed at the stage of manufacturing the sheet by using the water absorbing hole 101 formed on the bottom surface of the food packing tray 1 formed using the sheet, Is formed on the bottom surface of the food packing tray (1) after the food packing tray (1) is formed.

The biodegradable foamed sheets 100 and 100 'promote the decomposition of the polymer resin due to a complex decomposition action such as heat, light, microorganisms, enzymes or chemical reactions, and finally, water, carbon dioxide and biomass Can be completely decomposed. And the manufacturing cost is low, which is advantageous for commercialization.

The polymer resin constituting the biodegradable foamed sheet 100 or 100 'may be any one selected from the group consisting of polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyacrylic, ethylene vinyl acetate or thermoplastic resins of polyvinyl chloride When the amount of the polymer resin used is less than 40.0 wt%, there is a problem that the physical properties of the product are lowered. When the amount of the polymer is more than 95.0 wt%, the time required for the decomposition may become longer, Is preferably limited to a range of 40.0 to 95.0 wt% based on the total amount of the biodegradable foamed sheet.

The biodegradable materials constituting the biodegradable foamed sheets 100 and 100 'include polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS) , Poly (butylenes adipate-co-terephthalate), and copolymers thereof, or a mixture thereof. Particularly, the fatty acid ester compound is hydrolyzed in addition to the biodegradation function, Organic acid decomposes and decomposes organic acid acts as a catalyst of oxidation promoter and accelerates chemical decomposition of polymer resin.

The amount of the biodegradable agent to be used is limited within the range of 0.5 to 30.0 wt% with respect to the total amount of the composition, more preferably 1.0 to 20.0 wt%.

When the amount of the biodegradable agent is less than 0.5 wt%, degradation of the biodegradation function and decomposition of the organic acid can not act as a catalyst for the chemical decomposition of the polymer resin. If the amount of the biodegradable agent exceeds 30 wt% The physical properties of the resin may be deteriorated. Therefore, the amount of the biodegradable agent is preferably limited within a range of 0.5 to 30.0 wt% based on the total amount of the biodegradable foamed sheet.

The above-mentioned Dicumyl peroxide (DCP) is a crosslinking agent used for producing a foam in a good state at the time of foaming. When the crosslinking agent is crosslinked by the crosslinking agent, viscosity is lowered and workability is improved. When the amount of the cross-linking agent is less than 0.5 wt%, it is difficult to expect such an effect. When the amount of the cross-linking agent exceeds 5.0 wt%, the use of the cross-linking agent is unnecessary. Therefore, To 5.0 wt%.

When the amount of zinc oxide (ZnO) used as a crosslinking aid is less than 0.5 wt%, the crosslinking rate may be lowered. When the amount of zinc oxide exceeds 5.0 wt%, the change in crosslinking rate is insignificant, The amount of zinc (ZnO) to be used is preferably limited to a range of 0.5 to 5.0 wt% based on the total amount of the biodegradable foamed sheet.

Stearic acid is a compatibilizing agent that imparts compatibility with components so that they are well mixed with each other. When the amount of the stearic acid used is less than 0.1 wt%, the compatibility is not sufficient and there is a problem that components are not mixed well. The use amount of stearic acid is preferably limited within a range of 0.1 to 10.0 wt% with respect to the total amount of the biodegradable foamed sheet.

The cerium stearate is an oxidation promoter which accelerates the decomposition of the polymer resin in an environment of heat, light, etc. When the amount of the cerium stearate used is less than 0.1 wt%, the decomposition accelerating function is insufficient, and when it exceeds 30.0 wt% The use amount of the cerium stearate is preferably limited within a range of 0.1 to 30.0 wt% with respect to the total amount of the biodegradable foam sheet.

The aluminum nitride is a biodegradable heat transfer promoter.

The heat transfer promoter may be an aluminum powder (thermal conductivity 220 to 240 W · m ^-1 K ^-1 ), aluminum oxide (35 to 40 W · m ^-1 K ^-1 ), aluminum nitride 170 ~ 190 W · m ^-1 · K ^-1 ), boron nitride (150 ~ 200 W · m ^-1 · K ^-1 ), carbon nanotubes (3,180 ~ 3,500 W · m ^-1 · K ^-1 ) 1,000 to 1,000 W · m ^-1 · K ^-1 ) and copper powder (350 to 400 W · m ^-1 · K ^-1 ). However, as long as it has a heat transfer promoting function in addition to the heat transfer promoter, it can be used without limitation.

Particularly, since the heat transfer promoter is composed of an inorganic material, it enhances the decomposition of the polymer resin by increasing the heat transfer rate as well as acting as a reinforcing agent of the polymer resin. Generally, a polymer resin (thermal conductivity of 0.04 to 0.2 W · m ^-1 · K ^-1 ), calcium carbonate (1.2 to 1.4 W · m ^-1 · K ^-1 ) and silica (0.4 to 2.0 W · m ^-1 · K ^-1 ) and the like have a very low thermal conductivity value.

The amount of the heat transfer promoter is limited within the range of 0.1 to 20.0 wt% with respect to the total amount of the composition, more preferably 1.0 to 15.0 wt%.

When the amount of the heat transfer promoter used is less than 0.1 wt%, the heat transfer rate is low and the chemical oxidation reaction of the polymer resin can not be easily performed. When the amount of the heat transfer promoter is more than 20.0 wt%, the extrudability and economical efficiency are lowered, The amount of the heat transfer promoter to be used is preferably limited to a range of 0.1 to 20.0 wt% with respect to the total amount of the composite degradable polymer resin composition.

The freshness-maintaining composition (h) is prepared by pulverizing Baekseoncho cactus fruit, mixing with 4-6 times the weight of distilled water, shaking at 18-22 ° C for 10-20 hours, extracting the extract at 6,000-8,000 rpm for 20-30 And the supernatant is filtered with a filter paper and the filtrate is subjected to sterilization treatment at 75 to 85 ° C for 5 to 15 minutes to obtain 20.0 to 50.0 wt%

Onion peel powder and purified water were mixed at a weight ratio of 1: 4 to 6: 1, and then subjected to hot extraction at 100 ° C for 20 to 40 minutes to obtain an extract. The extract was centrifuged at 63 to 68 ° C using a rotary evaporator And the filtrate was filtered with a filter paper, and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes to obtain 20.0 to 50.0 wt% of onion extract, ,

The extracts were obtained by immersing the mistletoe powder in 75% ethanol having a weight of 10 to 20 times and kept at room temperature for 20 to 30 hours. The extracts were dried at a temperature of 63 to 68 ° C using a rotary evaporator at 18 to 22 The filtrate is filtered with a filter paper, and the filtrate is subjected to a sterilization treatment at 75 to 85 ° C for 5 to 15 minutes to obtain a mixture of 20.0 to 50.0 wt% of mistletoe extract obtained by concentrating the filtrate under reduced pressure .

Specific formulations of the freshness-maintaining composition (h) are shown in Table 1 below.

Formulation Example 1 Formulation Example 2 Formulation Example 3 Formulation Example 4 Formulation Example 5 Perennial extract 30.0 wt% 35.0 wt% 35.0 wt% 32.5 wt% 40.0 wt% Onion extract 35.0 wt% 30.0 wt% 35.0 wt% 35.0 wt% 20.0 wt% mistletoe
extract 35.0 wt% 35.0 wt% 30.0 wt% 32.5 wt% 40.0 wt% Sum 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt%

The freshness-maintaining composition (h) is used within a range of 1.0 to 20.0 wt% based on the total weight of the biodegradable foam sheet, thereby maintaining the freshness of the food for a long time. When the amount of the freshness- When the content of the freshness-retaining composition (h) is less than 20.0 wt%, the content of the other ingredients may be reduced and the antibacterial and antioxidant functionality may be deteriorated. .

The antimicrobial composition (i) is prepared by mixing grapefruit seed and ethanol at a weight ratio of 1: 5 to 10: 1, refluxing the mixture at 65 to 70 ° C for 1 to 1.5 hours, centrifuging at 10,000 xg for 10 to 20 minutes The supernatant was concentrated under reduced pressure at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator, the supernatant was concentrated under reduced pressure, filtered through a filter paper, 20.0 to 50.0 wt% of grapefruit seed extract obtained by sterilizing the filtrate at 75 to 85 ° C for 5 to 15 minutes,

The mixture of Omiza pulp and seeds in a weight ratio of 1: 1 was ground to prepare a powder. The mixture of Omiza powder and water was mixed at a weight ratio of 1: 5 to 15, and then subjected to hot water extraction at 100 ° C for 2 to 4 hours. , And the extract was centrifuged at 2,500 to 3,500 rpm for 4 to 8 minutes to take the supernatant. The supernatant was concentrated under reduced pressure at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator , The filtrate was filtrated with filter paper and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes to obtain 20.0 to 50.0 wt% of the extract of Omiza,

The grape seed powder and distilled water were mixed at a weight ratio of 1: 5 to 15, and the mixture was heated at 100 ° C for 3 to 5 hours to obtain an extract. The extract was centrifuged at 63 to 68 ° C for 18 to 30 minutes using a rotary evaporator, The extract was concentrated under reduced pressure for 22 hours and then concentrated under reduced pressure. The extract was filtered with a filter paper and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes to obtain a mixture of 20.0 to 50.0 wt% do.

Specific formulations of the antimicrobial composition (i) are shown in Table 2 below.

Formulation Example 1 Formulation Example 2 Formulation Example 3 Formulation Example 4 Formulation Example 5 Grapefruit seed extract 50.0 wt% 45.0 wt% 45.0 wt% 40.0 wt% 35.0 wt% Omija extract 25.0 wt% 30.0 wt% 25.0 wt% 30.0 wt% 35.0 wt% Grape seed extract 25.0 wt% 25.0 wt% 30.0 wt% 30.0 wt% 30.0 wt% Sum 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt%

The antimicrobial composition (i) is used in an amount of 1.0 to 20.0 wt% based on the total weight of the biodegradable foamed sheet to impart antimicrobial activity. When the amount of the antimicrobial composition is less than 1.0 wt% The amount of the antimicrobial composition (i) is preferably limited within the range of 1.0 to 20.0 wt%, since the content of the other components may be reduced to deteriorate the freshness and the antioxidant functionality.

The antioxidant composition (j) is prepared by mixing Rhus verniciflua powder and distilled water at a weight ratio of 1:10 to 20, and heating the mixture in a water bath at 100 ° C for 2 to 4 hours to obtain an extract, The extract was concentrated under reduced pressure for 18 to 22 hours at 63 to 68 ° C using a rotary evaporator and the filtrate was concentrated under reduced pressure. The extract was filtered with a filter paper and the filtrate was stirred at 75 to 85 ° C for 5 to 15 minutes 20.0 to 50.0 wt% of the Rhus verniciflua extract obtained by sterilization treatment,

The rape seeds were immersed in 80 to 80 times by weight of ethanol and maintained at room temperature for 20 to 30 hours to obtain an extract. The extract was centrifuged at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator 20.0-50.0 wt% of the extract obtained from the extract obtained by concentrating the filtrate under reduced pressure and concentrated under reduced pressure with a filter paper and sterilizing the filtrate at 75-85 ° C for 5-15 minutes,

The purple sweet potato powder and water were mixed at a weight ratio of 1:20 to 50, and the mixture was extracted with shaking for 20 to 30 hours to obtain an extract. The extract was centrifuged at 10,000 to 20,000 rpm for 10 to 20 minutes to obtain supernatant, The supernatant was concentrated under reduced pressure at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator, and the supernatant, which had been concentrated under reduced pressure, was filtered through a filter paper, and the filtrate was stirred at 75 to 85 ° C And 20.0 to 50.0 wt% of the purplish sweet potato extract obtained by sterilization treatment for 5 to 15 minutes.

Specific formulation examples of the antioxidant composition (j) are shown in Table 3 below.

Formulation Example 1 Formulation Example 2 Formulation Example 3 Formulation Example 4 Formulation Example 5 Rhus verniciflua extract 25.0 wt% 25.0 wt% 30.0 wt% 30.0 wt% 35.0 wt% Rapeseed extract 50.0 wt% 45.0 wt% 45.0 wt% 40.0 wt% 35.0 wt% Purple sweet potato
extract 25.0 wt% 30.0 wt% 25.0 wt% 30.0 wt% 30.0 wt% Sum 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt%

The antioxidant composition (j) is used in an amount of 1.0 to 20.0 wt% based on the total weight of the biodegradable foam sheet to provide an antioxidant function. When the amount of the antioxidant composition (j) is less than 1.0 wt% When the content of the antioxidant composition (j) exceeds 20.0 wt%, the content of the other components may be decreased to maintain the freshness and antimicrobial function, and therefore the amount of the antioxidant composition (j) should be limited within a range of 1.0 to 20.0 wt% Do.

Specific formulations of the foaming mixture constituting the biodegradable foam sheet (100, 100 ') are shown in Table 4 below.

division Formulation Example 1 Formulation Example 2 Formulation Example 3 Formulation Example 4 Formulation Example 5 Polymer resin 60.0 wt% 65.0 wt% 69.9 wt% 74.9 wt% 79.9 wt% Biodegradation agent 20.0 wt% 15.0 wt% 15.0 wt% 10.0 wt% 5.0 wt% Cross-linking agent 1.0 wt% 1.0 wt% 1.0 wt% 1.0 wt% 1.0 wt% Crosslinking auxiliary 0.5 wt% 0.5 wt% 0.5 wt% 0.5 wt% 0.5 wt% Compatibilizer 0.2 wt% 0.2 wt% 0.2 wt% 0.2 wt% 0.2 wt% Oxidation promoter 0.2 wt% 0.2 wt% 0.2 wt% 0.2 wt% 0.2 wt% Heat transfer promoter 0.2 wt% 0.2 wt% 0.2 wt% 0.2 wt% 0.2 wt% blowing agent 5.0 wt% 5.0 wt% 10.0 wt% 10.0 wt% 10.0 wt% Maintain freshness
Composition 4.3 wt% 5.0 wt% 1.0 wt% 1.0 wt% 1.0 wt% Antimicrobial composition 4.3 wt% 5.0 wt% 1.0 wt% 1.0 wt% 1.0 wt% Prevent oxidation
Composition 4.3 wt% 2.9 wt% 1.0 wt% 1.0 wt% 1.0 wt% Sum 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt% 100.0 wt%

The biodegradable foam sheet (100) according to the present invention comprises 40.0 to 95.0 wt% of the polymer resin (a); A biodegradation agent (b) 0.5 to 30.0 wt%; 0.5 to 5.0 wt% of a crosslinking agent (c); (D) 0.5 to 5.0 wt% of a crosslinking auxiliary; (E) 0.1 to 10.0 wt% of compatibilizer; 0.1 to 30.0 wt% of an oxidation promoter (f); A heat transfer promoter (g) 0.1 to 20.0 wt%; Freshness-maintaining composition (h) 1.0 to 20.0 wt%; Antimicrobial composition (i) 1.0 to 20.0 wt%; (J) 1.0 to 20.0 wt% of the antioxidant composition (j) is heated and pressurized, and the pressure is instantaneously removed to produce a foam. The foam is then extruded to form a sheet .

Hereinafter, a method of manufacturing the biodegradable foam sheet will be described.

&Lt; Process for producing biodegradable foam sheet >

3, the method for producing a biodegradable foamed sheet according to the present invention is a method for producing a biodegradable foamed sheet according to the present invention, which comprises the steps of: preparing a foamed sheet of a selected one of polyethylene, Or a mixture of two or more thereof (a) 40.0 to 95.0 wt%;

Polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS), poly (butylenes adipate-co-terephthalate) 0.5 to 30.0 wt% of a biodegradable agent (b) which is a mixture of any one or two selected from the group consisting of polyvinyl alcohol,

0.5 to 5.0 wt% of a crosslinking agent (c) of Dicumyl peroxide (DCP);

0.5 to 5.0 wt% of a crosslinking aid (d) of zinc oxide (ZnO);

A compatibilizer of stearic acid (e) 0.1 to 10.0 wt%;

0.1 to 30.0 wt% of an oxidation promoter (f) of cerium stearate;

Biodegradation agent of aluminum nitride Heat transfer promoter (g) 0.1 to 20.0 wt%;

1.0 to 20.0 wt% of freshness-maintaining composition (h) of 100.0 wt% composed of 20.0 to 50.0 wt% of Baicin Seed extract, 20.0 to 50.0 wt% of onion extract and 20.0 to 50.0 wt% of mistletoe extract;

(I) 1.0 to 20.0 wt% of an antimicrobial composition comprising 100.0 wt% of a mixture of 20.0 to 50.0 wt% of grapefruit seed extract, 20.0 to 50.0 wt% of an extract of Omiza, and 20.0 to 50.0 wt% of a grape seed extract;

1.0 to 20.0 wt% of the antioxidant composition (j) composed of 20.0 to 50.0 wt% of the Rhus verniciflua extract, 20.0 to 50.0 wt% of the oilseed rape extract and 20.0 to 50.0 wt% of the purple sweet potato extract, (a + b + c + d + e + f + g + h + i + j)

(S10) of first kneading the polymer resin (a) and the biodegradable agent (b) at 95 to 105 ° C for 1 to 5 minutes (sec)

(C), a crosslinking auxiliary (d), a compatibilizing agent (e), an oxidizing accelerator (f) and a biodegradation agent heat transfer promoter (g) are added to the mixture after the primary kneading process. (S20) of secondary kneading for a minute (sec)

Adding the freshness-maintaining composition (h), the antimicrobial composition (i) and the antioxidant composition (j) to the mixture after the second kneading process and then performing a third kneading at 80 to 90 ° C for 3 to 10 minutes S30)

The blowing agent of Azodicarbonamide (ADCA) was added to the final mixture after the third kneading process, and the mixture for the foaming was added so that the blending ratio of the final blend of 90.0 to 99.0 wt% and the foaming agent of 1.0 to 10.0 wt% (Step S40)

Heating the mixture for foaming at 150 to 160 ° C. under a pressure of 12 to 18 MPa for 30 to 50 minutes using a hydraulic electric heating press to remove the pressure instantaneously and foaming (S50)

And a step (S60) of producing a sheet by extruding the foam produced through the foaming process.

The sheet may further include a plurality of holes formed on one side of the sheet by using a punching device so as not to completely penetrate the sheet.

The punching device forms a hole on the sheet while vertically reciprocating the plate with the punching pin. The device is not limited in its use as long as it can form a hole. Further, the formation of the holes without completely penetrating the sheet can be achieved by adjusting the width of the punching pins.

Specific examples of the biodegradable foam sheet manufacturing process are as follows.

80.0 wt% polyethylene; 3.0 wt% of a biodegradable material prepared by mixing polylactic acid (PLA) and poly (butylenes adipate-co-terephthalate), PBAT in a weight ratio of 1: 1; 0.5 wt% of Dicumyl peroxide (DCP); 0.5 wt% of zinc oxide (ZnO); 0.3 wt% stearic acid; 4.0 wt% of cerium stearate; 0.3 wt% of aluminum nitride; 4.0 wt% of azodicarbonamide (ADCA); 3.0 wt% of freshness-keeping composition prepared by mixing Paeonia sp. Extract, onion extract and mistletoe extract in the same weight ratio; 2.0 wt% of an antimicrobial composition prepared by mixing grapefruit seed extract, omija extract and grape seed extract at the same weight ratio; A biodegradable foam sheet is prepared using a blending ratio of an antioxidant composition (2.4 wt%) mixed with Rhus verniciflua extract, rapeseed extract and purple sweet potato extract at the same weight ratio.

First, the polyethylene and the biodegradation agent are first kneaded at 100 DEG C for 3 minutes (sec).

Dicumyl peroxide (DCP), zinc oxide (ZnO), stearic acid, cerium stearate, aluminum nitride, and azodicarbonamide (ADCA) were added to the primary kneaded mixture Followed by secondary kneading at 85 캜 for 7 minutes (sec).

The freshness-retaining composition, the antimicrobial composition and the antioxidant composition were added to the secondary-kneaded mixture, and the mixture was thirdly kneaded at 85 캜 for 7 minutes (sec).

The third blended mixture is heated at 160 DEG C under a pressure of 15 MPa for 30 minutes by using a hydraulic electric heating press, and then the pressure is removed instantaneously and then foamed. At this time, the foam gas dissolved in the mixture rapidly expands the polymer, and then the foam is cooled at room temperature to form a foam having a stable cell shape.

The thus foamed foam is passed through an extruder die to produce a biodegradable foam sheet according to the present invention.

A biodegradable foam sheet is manufactured through the same procedure as in Example 1, and a plurality of holes are formed on one side of the biodegradable foam sheet.

A plurality of holes are formed on one side of the biodegradable foam sheet by using a punching device for raising and lowering a punching plate provided with a plurality of punching pins. At this time, however, the hole does not completely penetrate the biodegradable foam sheet, but forms a hole of 1/3 to 1/2 length of the thickness of the biodegradable foam sheet.

<Food packaging tray>

The food packing tray 1 according to the present invention is manufactured by thermally molding the above-described biodegradable foam sheet in a mold, and its shape is as shown in Figs. 4 to 7. Fig.

The food packing tray (1) is made of a biodegradable foamed sheet,

A food receiving portion 10 having a rectangular container structure for receiving food,

And a plurality of water absorption holes (101) formed on a bottom surface of the food accommodation part (10)

The water absorption hole 101 has a circular or polygonal shape with a diameter of 1.2 to 1.8 mm.

By forming the water absorbing holes 101, fluids such as moisture generated from vegetables and fluids generated from meat are flowed into the water absorbing holes 101, so that water or biting water To remain in a state that is almost unfolded, so that it can be maintained in aesthetically pleasing and storage-friendly condition, thereby improving the degree of consumer purchase.

The shape of the food packing tray 1 shown in FIGS. 4 to 7 is exemplarily shown. The food packing tray 1 shown in FIGS. 4 to 7 includes a plurality of water absorbing holes 101 using the biodegradable foam sheet 100, 100 ' It is obvious to those skilled in the art that the shape of the food packing tray 1 can be variously formed.

The biodegradable foam sheet and the food packaging tray according to the present invention are suitable for packaging foods that require freshness because they contain antibacterial, antioxidant, and freshness-retaining functions as they are biodegraded. The tray for food packaging is used for storage and distribution of fresh foods It is very clean and can improve the purchasing power of consumers, which is very likely to be used in the industry.

1: Food packaging tray
10: Food receptacle
100: biodegradable foam sheet
101: Water absorption hole

Claims (8)

40.0 to 95.0 wt.% Of a polymeric resin (a) which is a mixture of any one or more selected from the group consisting of polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyacrylic, ethylene vinyl acetate or polyvinyl chloride;
Polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS), poly (butylenes adipate-co-terephthalate) 0.5 to 30.0 wt% of a biodegradable agent (b) which is a mixture of any one or two selected from the group consisting of polyvinyl alcohol,
0.5 to 5.0 wt% of a crosslinking agent (c) of Dicumyl peroxide (DCP);
0.5 to 5.0 wt% of a crosslinking aid (d) of zinc oxide (ZnO);
A compatibilizer of stearic acid (e) 0.1 to 10.0 wt%;
0.1 to 30.0 wt% of an oxidation promoter (f) of cerium stearate;
Biodegradation agent of aluminum nitride Heat transfer promoter (g) 0.1 to 20.0 wt%;
1.0 to 20.0 wt% of freshness-maintaining composition (h) of 100.0 wt% composed of 20.0 to 50.0 wt% of Baicin Seed extract, 20.0 to 50.0 wt% of onion extract and 20.0 to 50.0 wt% of mistletoe extract;
(I) 1.0 to 20.0 wt% of an antimicrobial composition comprising 100.0 wt% of a mixture of 20.0 to 50.0 wt% of grapefruit seed extract, 20.0 to 50.0 wt% of an extract of Omiza, and 20.0 to 50.0 wt% of a grape seed extract;
1.0 to 20.0 wt% of the antioxidant composition (j) composed of 20.0 to 50.0 wt% of the Rhus verniciflua extract, 20.0 to 50.0 wt% of the oilseed rape extract and 20.0 to 50.0 wt% of the purple sweet potato extract, (a + b + c + d + e + f + g + h + i + j)
To the mixture was added a foaming agent of Azodicarbonamide (ADCA), and the mixture was added by 90.0 to 99.0 wt% and 1.0 to 10.0 wt% of a foaming agent so as to be foamed to form a foam, Wherein the foam sheet is made of a sheet.
The method according to claim 1,
A biodegradable foamed sheet characterized in that a sheet is formed by using a punching device so as to form a plurality of holes on one side thereof but not completely penetrate the sheet.
The method according to claim 1,
The freshness-maintaining composition (h) is prepared by pulverizing Baekseoncho cactus fruit, mixing with 4-6 times the weight of distilled water, shaking at 18-22 ° C for 10-20 hours, extracting the extract at 6,000-8,000 rpm for 20-30 minutes 20.0-50.0 wt% of the extract obtained by sterilizing the filtrate at 75-85 DEG C for 5-15 minutes, and the supernatant obtained by centrifuging the supernatant, filtering the supernatant with filter paper,
Onion peel powder and purified water were mixed at a weight ratio of 1: 4 to 6: 1, and then subjected to hot extraction at 100 ° C for 20 to 40 minutes to obtain an extract. The extract was centrifuged at 63 to 68 ° C using a rotary evaporator And the filtrate was filtered with a filter paper, and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes to obtain 20.0 to 50.0 wt% of onion extract, ,
The extracts were obtained by immersing the mistletoe powder in 75% ethanol having a weight of 10 to 20 times and kept at room temperature for 20 to 30 hours. The extracts were dried at a temperature of 63 to 68 ° C using a rotary evaporator at 18 to 22 The filtrate is filtered with a filter paper and the filtrate is composed of a mixture of 20.0 to 50.0 wt% of mistletoe extract obtained by sterilizing the filtrate at 75 to 85 ° C for 5 to 15 minutes Wherein the biodegradable foam sheet is a biodegradable foam sheet.
The method according to claim 1,
The antimicrobial composition (i) is prepared by mixing grapefruit seed and ethanol at a weight ratio of 1: 5 to 10: 1, refluxing the mixture at 65 to 70 ° C for 1 to 1.5 hours, centrifuging at 10,000 × g for 10 to 20 minutes The supernatant was concentrated under reduced pressure at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator, and the supernatant was concentrated under reduced pressure. The supernatant was filtered with a filter paper, 20.0 to 50.0 wt% of a grapefruit seed extract obtained by sterilizing at 75 to 85 ° C for 5 to 15 minutes,
The mixture of Omiza pulp and seeds in a weight ratio of 1: 1 was ground to prepare a powder. The mixture of Omiza powder and water was mixed at a weight ratio of 1: 5 to 15, and then subjected to hot water extraction at 100 ° C for 2 to 4 hours. , And the extract was centrifuged at 2,500 to 3,500 rpm for 4 to 8 minutes to take the supernatant. The supernatant was concentrated under reduced pressure at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator , The filtrate was filtrated with filter paper and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes to obtain 20.0 to 50.0 wt%
The grape seed powder and distilled water were mixed at a weight ratio of 1: 5 to 15, and the mixture was heated at 100 ° C for 3 to 5 hours to obtain an extract. The extract was centrifuged at 63 to 68 ° C for 18 to 30 minutes using a rotary evaporator, The extract was concentrated under reduced pressure for 22 hours and then concentrated under reduced pressure. The extract was filtered with a filter paper and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes to obtain a mixture of 20.0 to 50.0 wt% Wherein the biodegradable foam sheet is a biodegradable foam sheet.
The method according to claim 1,
The antioxidant composition (j) is prepared by mixing Rhus verniciflua powder and distilled water at a weight ratio of 1:10 to 20, and heating the mixture in a water bath at 100 ° C for 2 to 4 hours to obtain an extract, The extract was concentrated under reduced pressure for 18 to 22 hours at 63 to 68 ° C using a rotary evaporator and the filtrate was concentrated under reduced pressure. The extract was filtered with filter paper and the filtrate was sterilized at 75 to 85 ° C for 5 to 15 minutes 20.0 to 50.0 wt% of the extract of Rhus verniciflua obtained by the treatment,
The rape seeds were immersed in 80 to 80 times by weight of ethanol and maintained at room temperature for 20 to 30 hours to obtain an extract. The extract was centrifuged at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator 20.0-50.0 wt% of the extract obtained from the extract obtained by concentrating the filtrate under reduced pressure and concentrated under reduced pressure with a filter paper and sterilizing the filtrate at 75-85 ° C for 5-15 minutes,
The purple sweet potato powder and water were mixed at a weight ratio of 1:20 to 50, and the mixture was extracted with shaking for 20 to 30 hours to obtain an extract. The extract was centrifuged at 10,000 to 20,000 rpm for 10 to 20 minutes to obtain supernatant, The supernatant was concentrated under reduced pressure at 63 to 68 ° C for 18 to 22 hours using a rotary evaporator, and the supernatant, which had been concentrated under reduced pressure, was filtered through a filter paper, and the filtrate was stirred at 75 to 85 ° C And 20.0 to 50.0 wt% of a purplish sweet potato extract obtained by sterilization treatment for 5 to 15 minutes.
40.0 to 95.0 wt.% Of a polymeric resin (a) which is a mixture of any one or more selected from the group consisting of polyethylene, polypropylene, polyester, polystyrene, polycarbonate, polyacrylic, ethylene vinyl acetate or polyvinyl chloride;
Polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polybutylene succinate (PBS), poly (butylenes adipate-co-terephthalate) 0.5 to 30.0 wt% of a biodegradable agent (b) which is a mixture of any one or two selected from the group consisting of polyvinyl alcohol,
0.5 to 5.0 wt% of a crosslinking agent (c) of Dicumyl peroxide (DCP);
0.5 to 5.0 wt% of a crosslinking aid (d) of zinc oxide (ZnO);
A compatibilizer of stearic acid (e) 0.1 to 10.0 wt%;
0.1 to 30.0 wt% of an oxidation promoter (f) of cerium stearate;
Biodegradation agent of aluminum nitride Heat transfer promoter (g) 0.1 to 20.0 wt%;
1.0 to 20.0 wt% of freshness-maintaining composition (h) of 100.0 wt% composed of 20.0 to 50.0 wt% of Baicin Seed extract, 20.0 to 50.0 wt% of onion extract and 20.0 to 50.0 wt% of mistletoe extract;
(I) 1.0 to 20.0 wt% of an antimicrobial composition comprising 100.0 wt% of a mixture of 20.0 to 50.0 wt% of grapefruit seed extract, 20.0 to 50.0 wt% of an extract of Omiza, and 20.0 to 50.0 wt% of a grape seed extract;
1.0 to 20.0 wt% of the antioxidant composition (j) composed of 20.0 to 50.0 wt% of the Rhus verniciflua extract, 20.0 to 50.0 wt% of the oilseed rape extract and 20.0 to 50.0 wt% of the purple sweet potato extract, (a + b + c + d + e + f + g + h + i + j)
(S10) of first kneading the polymer resin (a) and the biodegradable agent (b) at 95 to 105 ° C for 1 to 5 minutes (sec)
(C), a crosslinking auxiliary (d), a compatibilizing agent (e), an oxidizing accelerator (f) and a biodegradation agent heat transfer promoter (g) are added to the mixture after the primary kneading process. (S20) of secondary kneading for a minute (sec)
Adding the freshness-maintaining composition (h), the antimicrobial composition (i) and the antioxidant composition (j) to the mixture after the second kneading process and then performing a third kneading at 80 to 90 ° C for 3 to 10 minutes S30)
The foaming agent of Azodicarbonamide (ADCA) was added to the final mixture after the third kneading, and the mixture was added so that the blending ratio of the final blend of 90.0 to 99.0 wt% and the foaming agent of 1.0 to 10.0 wt% (Step S40)
Heating the mixture for foaming at 150 to 160 ° C. under a pressure of 12 to 18 MPa for 30 to 50 minutes using a hydraulic electric heating press to remove the pressure instantaneously and foaming (S50)
And a step (S60) of extruding the foamed product through the foaming process to form a sheet (S60).
The method of claim 6,
Wherein the sheet is formed by a step of forming a plurality of holes on one side of the sheet by using a punching device so as not to completely penetrate the sheet.



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