KR20030052471A - Heat-Resistive Bio-Dissolution materials Using starch, Manufacturing Method Thereof And Disposal Container - Google Patents

Abstract

PURPOSE: Provided are a thermal resistant biodegradable material using starch which can be degraded when buried and can be dipped in hot water, a method for producing the same and a container using the same. CONSTITUTION: The thermal resistant biodegradable material comprises 50 to 90 wt% of starch powder, 5 to 20 wt% of polyolefin as an adhesive and 5 to 30 wt% of calcium carbonate. The mixture of starch powder, polyolefin and calcium carbonate has a moisture content of about 1%. The starch can be obtained from at least selected from the group consisting of sweet potato, potato, corn, rice, flour and sugar cane. The material is produced by mixing 50 to 90 wt% of starch powder and 5 to 20 wt% of polyolefin; kneading the mixture at a temperature of 110 to 120 deg.C; adding 5 to 30 wt% of calcium carbonate while stirring; cooling the mixture to 35 to 45 deg.C and dehydrating to the water content of about 1%; and forming the dehydrated product into pellets by extrusion at 120 to 210 deg.C.

Description

Heat-Resistive Bio-Dissolution materials Using starch, Manufacturing Method Thereof And Disposal Container}

The present invention relates to a heat resistant biodegradable raw material using a starch, a manufacturing method and a container thereof, and more particularly, to a heat resistant biodegradable raw material using starch that can contain hot water while being readily biodegradable when embedded in a starch. And containers.

In general, disposable products that are used once discarded are typical lunch box containers, cup noodles containers, buffers and the like. Since these products are usually made of plastic, styrofoam, paper, resin, etc., they are easily used and easily discarded. However, plastics, styrofoam, synthetic resins, etc. discarded in this way have a problem of saturation of the landfill site because it requires about 500 years to decompose when landfilled.

In order to prevent the saturation state of the buried place, plastic, styrofoam, synthetic resin, etc. are incinerated. Although incineration has the effect of drastically reducing the volume, incineration releases many toxic substances such as dioxins and furans, which is another cause of air pollution and damage to the health of the people.

In addition, when plastic, styrofoam, synthetic resins, etc. are used as food containers, environmental hormones are emitted from them, which adversely affects the human body. In particular, when pour hot water or put hot food in a container made of plastic, styrofoam, synthetic resin, etc., it is known that the environmental hormone is released more. Therefore, there is a claim that it is inappropriate as a container for food, and each company or research institute is trying to find alternative raw materials.

In order to solve such environmental problems and health problems, development of biodegradable raw materials using starch has been in the spotlight, and some are using them in shopping bags, garbage bags, toothpicks, and the like.

However, conventional biodegradable raw materials are characterized by weak durability and particularly weak heat. For this reason, conventionally, there was a technical limitation that a container containing hot food (for example, cup ramen, lunch box, etc.) using a biodegradable raw material could not be manufactured. In addition, the conventional biodegradable raw material is the only disposal method is the landfill after use and decomposition by microorganisms due to the weak durability. That is, it was impossible to recycle, and thus had an uneconomical waste of raw materials.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, the first object of the present invention is to provide a raw material that is biodegraded by microorganisms when buried, a manufacturing method and a manufacturing apparatus and a disposable container using the same. It is.

A second object of the present invention is to provide a disposable container molded using a raw material having durability, heat resistance and biodegradability.

It is a third object of the present invention to provide a heat resistant biodegradable raw material using starch which can be recycled after use, a manufacturing method thereof, and a container thereof.

An object of the present invention as described above comprises 50 to 90% by weight of starch, 5 to 20% by weight of polyolefin and 5 to 30% by weight of calcium carbonate as an adhesive, and the water content of the mixture of starch powder, polyolefin and calcium carbonate It can be achieved by a heat resistant biodegradable raw material using starch, characterized in that about 1%.

And, the starch powder is preferably extracted from at least one crop selected from the group consisting of sweet potatoes, potatoes, corn, rice, flour, sugar cane.

In addition, the object of the present invention as described above,

Mixing 50 to 90% by weight of starch powder and 5 to 20% by weight of polyolefin with an adhesive (S10);

Stirring and pulverizing the mixture at a temperature of 110 to 120 ° C. to knead in a gelatinous state (S12);

Adding 5 to 30% by weight of calcium carbonate to the dough to stir (S14);

Dehydration step (S16) to maintain a water content of about 1% by cooling to 35 ~ 45 ℃; And

It can also be achieved by a method for producing a heat-resistant biodegradable raw material using a starch, characterized in that it comprises an extrusion step (S18) for extrusion into a pellet form by extruding at a temperature of 120 ~ 210 ℃.

In addition, the pellet is injected into the roller 30 to form a sheet (S20);

Firstly heating the sheet to a temperature of about 170 ° C. (S22);

Secondly heating the sheet to a temperature of about 220 ° C. (S24); And

It is more preferable that the sheet further comprises the step (S26) of forming a certain container shape.

An object of the present invention as described above comprises 50 to 90% by weight of starch, 5 to 20% by weight of polyolefin and 5 to 30% by weight of calcium carbonate as an adhesive, and the water content of the mixture of starch powder, polyolefin and calcium carbonate It can also be achieved by a heat resistant biodegradable vessel using starch, characterized in that it is molded into a sheet 51 which is about 1%.

In addition, it is preferable that the container is a cup 10 or a disposable tea container if it is a cup.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a perspective view of a heat resistant container using starch molded according to the present invention,

2 is a flow chart showing a method for producing a heat resistant biodegradable raw material using starch according to the present invention;

3 is a flow chart showing a method of forming a container from the pellets prepared by FIG.

4 is a schematic perspective view of an apparatus for producing heat resistant biodegradable raw materials using starch according to the present invention;

5 is a partial front view of the screw 40 installed inside the extruder 20 of the manufacturing apparatus shown in FIG.

6 is a cross-sectional view taken along the line A-A of FIG.

7 is a schematic perspective view of a molding apparatus 50 for molding a container from a heat resistant biodegradable raw material using starch in accordance with the present invention.

<Short Description of Main Reference Signs>

10 container, 20 extruder,

22: hopper, 24: motor,

26: screw housing, 30: roller machine,

33: roller, 35: feed table,

37: winder, 40: screw,

41: positive pressure stage, 43: negative pressure stage,

45: selection unit, 46: mixing unit,

47: step difference, 48: semi-rail unit,

50: molding apparatus, 51: sheet,

52; Conveyor belt, 53; Primary heating device,

55: secondary heating device, 57: hot plate,

58; 1st mold, 59: 2nd mold,

60: loading box, 61: molded product.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a heat resistant container 10 using starch molded according to the present invention. That is, as shown in Figure 1, the ramen inside, it can contain hot water, rice, coffee, tea, etc., when landfilled after use is biodegraded by microorganisms in about 30 days, can be recycled if finely crushed .

The biodegradable heat resistant container 10 includes 50 to 90% by weight of starch powder, 5 to 20% by weight of polyolefin and 5 to 30% by weight of calcium carbonate as an adhesive, and the water content of the mixture of starch powder, polyolefin and calcium carbonate. It has a component ratio of about 1%. Hereinafter, a method of manufacturing a raw material, a manufacturing apparatus, and an apparatus and a method of manufacturing a container for molding such a container 10 will be described in detail.

First, a method for preparing a heat resistant biodegradable raw material using starch according to the present invention will be described in detail. 2 is a flowchart illustrating a method of preparing a heat resistant biodegradable raw material using starch according to the present invention. As shown in FIG. 2, first, starch powder ((C is used) extracted from sweet potatoes, potatoes, corn, rice, flour, sugar cane, or a plurality of crops selected from these (in this embodiment, corn) is used. Prepare ₆ H ₁₀ O ₅ ) n). Next, a polyolefin having an adhesive component and calcium carbonate (CaCO ₃ ) as an additive are prepared.

Then, 50 to 90% by weight of starch powder and 5 to 20% by weight of polyolefin is mixed with an adhesive (S10).

Then, the mixture is stirred and pulverized at a high speed at a temperature of 110 to 120 ° C., and kneaded in a gelatinized state (S12).

Then, 5-30% by weight of calcium carbonate is added to the dough and stirred at high speed (S14).

Then, the dough is cooled to 35 ~ 45 ℃ dehydration so that the total water content is about 1% (S16).

Into the extruder 20 in the dehydrated state as described above is extruded at a temperature of 120 ~ 210 ℃ to form a pellet (Pallet) or granules (S18). The raw material manufactured in the form of such pellets is used as a raw material that is melted as needed and reprocessed into a desired form.

Hereinafter, a method of manufacturing a biodegradable container having heat resistance using the raw material prepared as described above will be described. 3 is a flow chart showing a method of forming a container from the pellets prepared by FIG. As shown in FIG. 3, first, pellets prepared according to the method shown in FIG. 2 are introduced into a roller 30 to be molded into sheets (S20). At this time, the sheet 51 is continuously molded to a size of approximately 67 cm in width.

Next, the sheet 51 is first heated (or preheated) to a temperature of about 170 ° C. (S22). After the sheet 51 is uniformly heated to a temperature of about 170 ° C, the sheet is secondarily heated to a temperature of about 220 ° C (S24). This temperature is the temperature just before molding so that the raw material has physical properties (e.g., elongation, strain, etc.) suitable for the molding process.

Then, the sheet is formed into a constant container at a temperature of about 220 ° C (S26). At this time, the molding is made by pressing, the shape of the container may be a variety of forms, such as cup noodles container, lunch box container, buffer shape.

Hereinafter will be described in detail with respect to the manufacturing apparatus of the heat-resistant biodegradable raw material according to the present invention. 4 is a schematic perspective view of an apparatus for producing heat resistant biodegradable raw materials using starch according to the present invention.

As shown in Figure 4, the raw material manufacturing apparatus is largely composed of an extruder 20 and a roller (30). The extruder 20 is provided with a hopper 22 for feeding the mixed raw material to one side, the other side is configured to discharge the extruded raw material. The screw housing 26 is provided in one direction between the hopper 20 and the discharge area of the extruder 20. Inside the screw housing 26, a pair of screws 40 are configured to rotate against each other. In addition, a plurality of steam outlets (not shown) are formed in the screw housing 26 to discharge steam generated in the extrusion process.

In addition, the motor 24 is installed in the discharge region of the extruder 20, and serves as a power source for rotating the pair of screws 40.

The roller 30 is provided on the discharge area side of the extruder 20, and the roller 33 is provided in order to shape the extruded raw material into a sheet form. The raw material which passed the roller 33 has a sheet form, is cooled as it passes through the feed stand 35, and is continuously wound in the winder 37. As shown in FIG.

Detailed specifications of the extruder 20 and the roller 30 used in the embodiment of the present invention are as follows. That is, the diameter of the screw 40 is about 75mm, the rotation speed of the screw 40 is 28 ~ 500rpm, the ratio of the length and diameter of the screw 40 is about 1: 50, the size of the roller is 423 X 800mm, sheet The thickness is 0.25 ~ 2.2mm, the production quantity is 150 ~ 300Kg / hr, the electrical output is 180KW.

FIG. 5 is a partial front view of the screw 40 installed inside the extruder 20 of the manufacturing apparatus shown in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line A-A of FIG. 5. 5 and 6, the screw 40 is largely composed of a positive pressure stage 41 and a negative pressure stage 43, the positive pressure stage 41 is again the selection unit 45 and the mixing unit 46 The negative pressure stage 43 is composed of a half wire unit 48. The screw 40 has a shape in which the positive pressure end 41 and the negative pressure end 43 are regularly repeated in the axial direction, and the screw 40 is configured to rotate by the motor 24 while being engaged in a pair. It is.

The selection unit 45 is formed with spirals to feed the raw material in the direction in which the raw material is extruded (that is, the first direction). The mixing unit 46 is integrally connected with the selection unit 45, and the diameter is smaller than that of the selection unit 45. In addition, the mixing unit 46 has a form in which about five eccentric cams are continuous in the axial direction, and as shown in FIG. 6, a step 47 having sharp edges is formed in the eccentric cam.

The half wire unit 48 is formed integrally with the mixing unit 46 and has the same diameter as the straight line unit 45. However, only the moving direction of the spiral is formed to be opposite to the selection unit 45, it is characterized in that the raw material is transferred in the direction opposite to the extrusion direction (or the first direction).

Hereinafter, the operation of the extruder 20 and the roller 30 having the configuration as described above will be described in detail. First, a raw material in which starch, polyolefin and calcium carbonate are mixed is introduced into the hopper 22. Then, as the motor 24 rotates, the pair of screws 40 are engaged and rotated, and the raw material starts to be transferred.

When the raw material reaches the selection unit 45, it starts to be transferred in the extrusion direction according to the spiral motion. Then, upon arriving at the mixing unit 46, mixing is performed by the step 47, and a part of the mixing unit 46 is transferred to the half line unit 48 side. At this time, a part of the raw material flows back to the mixing unit 46 by the negative pressure action of the semi-circulation unit 48. Since the mixing unit 46 has a small diameter, a large space is provided therein. Therefore, even if a part of the raw material is transferred in the reverse direction, the mixing unit 46 does not have a large influence on the mixing. When the steady state is achieved by such a continuous action, the raw material is extruded after reciprocating the mixing unit 46 and the semi-circle unit 48 several times. At this time, the temperature of the raw material is increased due to the frictional heat of the raw material, thereby converting the moisture contained in the raw material into vapor form. This steam is discharged through a steam outlet (not shown) formed around the screw housing 26.

The extruded raw material is discharged in the form of pellets and subsequently formed into a sheet by the roller 33. At this time, if necessary, the pellet can be cooled and stored or distributed as it is, and the pellet can be melted in another region and molded into a sheet. The sheet having passed through the roller 33 is cooled and solidified while passing through the transfer table 35, and wound up in the form of a roll in the winder 37. This completes the manufacture of the sheet according to the present invention.

Hereinafter, a method of molding a heat resistant biodegradable container from a sheet manufactured using the method and apparatus as described above will be described. 7 is a schematic perspective view of a molding apparatus 50 for molding a container from a heat resistant biodegradable raw material using starch in accordance with the present invention. As shown in FIG. 7, the wound sheet 51 is uniformly preheated to about 170 ° C. by the first heating device 53 while being transported along the belt 52. Then, it is uniformly heated to about 220 ° C. by the second heating device 55. The reason for distinguishing the primary heating and the secondary heating is that if the temperature is raised to 220 ° C at once, the thermal distribution is uneven, so that some parts fall short of the molding temperature and some parts are easily overheated and melted. This thermal non-uniformity also affects the molding result, causing a problem that the defective product is molded, such as a hole in the molded product. For reference, the heating temperature of a typical styrofoam is 120 ℃.

The hot plate 57 is installed between the secondary heating device 55 and the molds 58 and 59 to prevent the molds 58 and 59 themselves from being overheated by the heat of the heating device 55 and to maintain a constant temperature (about 220). Only the sheet 51 heated to ℃) serves to pass.

The mold is composed of a first mold 58 (aka, upper mold or female mold) and a second mold (aka, lower mold or male mold), and the heated sheet is squeezed therebetween to form the mold according to the mold shape. do.

Forming the sheet is removed from the mold (58, 59) and cooled while being separated by each container is loaded in the loading box (60). Thereby, the shaping | molding process of a disposable container is completed. Specific specifications of the molding apparatus 50 used in the present invention are as follows. That is, forming an area of 700 X 1200mm ^2, the width is 420 ~ 720mm ^2, using the vacuum negative pressure molding machine, the capacity of the vacuum pump is 160m ³ / hr, a pressure range of 1.8 ~ 2.2 m ³ / min, the production rate of the maldistribution is 6 ~ 15 times / min, molding depth is 0 ~ 260mm.

Hereinafter, the results of the biodegradation experiment of the disposable container molded as described above will be described. Table 1 below shows the mechanical properties and the results of biodegradation experiments of the container manufactured according to the present invention.

Item How to measure unit Actual indicator Remarks density ASTM D792 G / cm ³ 1.17 Melt index ASTM D1238 G / 10 min 3 Impact strength ASTM D256 Kgcm / cm 5.5 Elongation ASTM D638 Kg / cm ² 210 Biodegradation rate GB / T 18006.2-1999 IV level 5th grade is poisonous growth in 28 days

As can be seen in Table 1, the biodegradation rate was tested according to the Chinese standard, and it can be seen that when 28 days of being buried in the ground, poisonous growth reaches 5th grade. Considering that the biodegradation rate of the general biodegradable raw materials is only 4th grade, and the higher the water supply, the higher the decomposition rate, the better the biodegradation rate of the raw materials according to the present invention. For reference, when visually observed after 4 days, about 20% is decomposed, and it is classified as 2nd grade. After about 8%, about 70% is decomposed, it is classified as Grade 3, and after 11 days, 80% is decomposed. It is class. In addition, China's industrial standard is evaluated as satisfying the standard if it falls within 4 days within 28 days.

In addition, as shown in Table 1, the mechanical strength (impact strength, elongation) is also excellent, and there is a characteristic that the container is not broken even when an impact is applied from the outside. In addition, since the melt index is high, it has heat resistance of about 180 ° C. Therefore, when producing a container of disposable cup noodles using the raw material according to the present invention, even if the container containing about 100 ℃ of water is characterized in that the container can be supported without melting.

In addition, containers that have been used are decomposed by water or moisture after a certain period of time when they are buried in water or in the ground. In addition, when food waste is present in the container of the present invention, the container may be used as a feed for livestock without being separated separately.

And, even if the food in the container of the present invention is put in a microwave oven and cooked as it is, the container does not melt, there is no fear of environmental hormones, there is an effect that can largely replace the conventional disposable container.

In addition, when the landfill container is completely decomposed to organic fertilizer, thereby having a side effect of fattening the soil, even if incinerated by natural ingredients does not generate toxic gas has an environmentally friendly nature without the concern of air pollution.

According to the present invention as described above, according to the heat-resistant biodegradable raw material using the starch, its manufacturing method and container, there is an environmentally friendly effect is biodegraded by microorganisms when the container is embedded.

Also, because it has durability, heat resistance and biodegradability, disposable cup ramen container, lunch box, buffer, coffee cup, tray, plate, oden container, tofu packaging, gimbap packaging, cold noodle for delivery, jjajangmyeon for delivery, bibimbap for delivery It can be used as a bowl. In addition to forming and molding into sheets as in the present application, injection molding may be used to produce disposable spoons, forks, knives, containers, plates, and the like.

In addition, it can be used as a feed or remolded by grinding after use, there is an advantage that the economic efficiency is very high. In addition, even when cooked in a microwave oven with food, there is a characteristic that does not discharge environmental hormones.

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. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (6)

50 to 90% by weight of starch, 5 to 20% by weight of polyolefin and 5 to 30% by weight of calcium carbonate as an adhesive, The heat-resistant biodegradable raw material using starch, characterized in that the water content of the mixture of starch powder, polyolefin and calcium carbonate is about 1%. 2. The heat resistant biodegradable raw material according to claim 1, wherein the starch powder is extracted from at least one crop selected from the group consisting of sweet potatoes, potatoes, corn, rice, flour, and sugar cane. Mixing 50 to 90% by weight of starch powder and 5 to 20% by weight of polyolefin with an adhesive (S10); Stirring and pulverizing the mixture at a temperature of 110 to 120 ° C. to knead in a gelatinous state (S12); Adding 5 to 30% by weight of calcium carbonate to the dough to stir (S14); Dehydration step (S16) to maintain a water content of about 1% by cooling to 35 ~ 45 ℃; And Method for producing a heat-resistant biodegradable raw material using a starch, characterized in that it comprises an extrusion step (S18) for extruding at a temperature of 120 ~ 210 ℃ to form a pellet. The method of claim 3, wherein Injecting the pellet into the roller (30) to form a sheet (S20); Firstly heating the sheet to a temperature of about 170 ° C. (S22); Secondly heating the sheet to a temperature of about 220 ° C. (S24); And Method of producing a heat-resistant biodegradable raw material using starch, characterized in that it further comprises the step (S26) of forming the sheet into a predetermined container form. 50 to 90% by weight of starch, 5 to 20% by weight of polyolefin and 5 to 30% by weight of calcium carbonate as an adhesive, wherein the water content of the mixture of starch powder, polyolefin and calcium carbonate is about 1% (51) Heat-resistant biodegradable container using starch, characterized in that molded into. 6. The heat resistant biodegradable vessel according to claim 5, wherein the vessel is a cup noodles vessel (10).