KR101916808B1 - Biodegradable Garbage Bag with Fin Valve - Google Patents

Abstract

A biodegradable garbage bag having a pin valve of the present invention comprises an outer layer and an inner layer having a pin valve formed with a diameter of 0.3 to 1.3 mm penetrated at intervals of 500-1,000 mm. The inner layer is composed of a mixture obtained by mixing 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA), and 5 to 40 parts by weight of calcium carbonate (CC), and 5 to 9 parts by weight of a chromatic or achromatic pigment with respect to 100 parts by weight of the mixture. The outer layer is composed of a mixture obtained by mixing 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA), and 5 to 40 parts by weight of calcium carbonate (CC), and 5 to 9 parts by weight of a chromatic or achromatic pigment which is different from the inner layer with respect to 100 parts by weight of the mixture. The inner layer or the outer layer is melted in an extruder by gradual heating to be in a gelated state at 106 to 112°C, a gel state at 116 to 122°C, a solated state at 126 to 132°C, and a sol state at 136 to 141°C, and then is extruded in a blown film molding apparatus. Therefore, heat is discharged from the inside to a pin valve, and the transmission of external light is reduced, and thus it is possible to delay a deformation speed of a packaged package. The extrusion molding of a film is good in a blown film molding apparatus after performing melting in an extruder by gradual heating. A garbage bag does not have to be collected after use. Therefore, manpower is saved, and dioxin and soot do not occur during incineration.

Description

[0001] The present invention relates to a biodegradable garbage bag with a fin valve,

The present invention relates to a biodegradable garbage bag having a fin valve, and more particularly, to a biodegradable garbage bag having a fin valve, and more particularly, to a biodegradable garbage bag having a fin valve, The coloring of the composition is made to be a double film different in color by the composition in which the pigment is mixed and the first melting of the composition is carried out in the state of Gelation, Gel, Solification, And the fin film is formed on the double film. It is decomposed by the microorganism in the natural state and the inside air is discharged to the outside, so that the freshness of the package is maintained for a long time and the freshness of the package is maintained. A biodegradable garbage bag having a pin valve used as a packaging bag, a one-time packaging bag, a living and food garbage bag, and the like.

Synthetic resins such as polyethylene, polystyrene, polypropylene and polyvinyl chloride have been used extensively in various fields of industry such as courier bags, mart envelopes, department store envelopes, food packaging bags, garbage bags, building materials and home appliances packaging, It occupies an indispensable position in life.

As for the conventional garbage bag,

Korean Patent Publication No. 10-0715888 DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION A film for fresh food or fermented food packaging (published on May 08, 2007) is a high-density polyethylene (HDPE) film without addition of inorganic compounds or organic compounds for forming pores ), At least one polyolefin resin selected from low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high molecular weight polyethylene (HMW-PE) and ultra high molecular weight polyethylene (UHMW-PE) Is a film for packaging fresh food or fermented food having a porosity of 10 to 80% and an average pore size of 001 to 2 탆 through microporosity by dry stretching.

The film for packaging fresh food or fermented food has improved tensile strength and tear strength by synthetic resin such as high density polyethylene (HDPE). However, if the synthetic resin itself is not biodegraded by microorganisms and accumulates in the soil, There is a problem that soil pollution problem is caused.

In addition, when the incinerator is incinerated, environmental hormones, carbon dioxide, and toxic dioxins are generated by incomplete combustion by a synthetic resin such as high density polyethylene (HDPE).

In addition, the conventional art has a problem that it is difficult to maintain the freshness of the package for a long period of time because the outside and inside air does not flow.

In addition, when the temperature of the inside and outside of the packaging pouch is large, the above-mentioned prior art has a problem that the inside water drops are formed and the mold is propagated to the package.

Disclosure of the Invention The present invention was conceived to solve the above problems of the prior art, and it is an object of the present invention to provide a polyurethane resin composition which comprises 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) From 5 to 40 parts by weight of calcium (CC) and from 5 to 9 parts by weight of pigments based on 100 parts by weight of the mixture and consisting of an inner layer and an outer layer of different colors and the first melting of the composition is carried out in an extruder at 106 to 112 ° C, ), Melted at a temperature of 116 to 122 ° C in a gel state, at a temperature of 126 to 132 ° C in a solubilization state and in a state of 136 to 141 ° C in a sol state, The inner layer and the outer layer are integrally molded and extruded, and a fin valve having a diameter of 0.3 to 1.3 mm is formed in the inner layer and the outer layer, so that no synthetic resin such as polyethylene (PE) is used at all, By a fin valve The inside air is discharged to the outside, and the freshness of the package is maintained for a long time, and it is used as a courier bag, a mat bag, a department store bag, a food packing bag, a one-time packing bag, a living and food garbage bag, And a biodegradable garbage bag having a valve.

The biodegradable garbage bag having a fin valve comprises 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) and 5 to 20 parts by weight of calcium carbonate (CC) 5 To 40 parts by weight of a mixture and 5 to 9 parts by weight of a pigment based on 100 parts by weight of the mixture; 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) and 5 to 40 parts by weight of calcium carbonate (CC) 5 to 9 parts by weight of a pigment is composed of a chromatic or achromatic outer layer different from the inner layer; The inner layer and the outer layer are formed into an integral double film at the time of extrusion in a blown film forming apparatus, and are formed at regular intervals and constitute a fin valve formed by a tear gap.

Further, the fin valve of the present invention is characterized in that the fin valve has a tear gap formed by the penetration of the perforation needle and a pin having a plate shape whose edge is fixed to the inner and outer layers and whose area increases from the center of the gap to the edge ).

Further, in the present invention, the diameter of the pin valve is 0.3 to 1.3 mm.

Further, in the present invention, the inner layer and the outer layer have an acid value of 1.7 to 2.3.

The present invention also relates to a process for the preparation of pigments, wherein the pigments are selected from the group consisting of Oyster Shell white, chalk, calcium carbonate, Kaolin, gypsum, Marble dust, talc, diatomaceous earth, pumice, quartz, silica, 玉髓, 髓 髓 髓 髓 髓 髓 髓 髓 髓, , chalcedony, mica, mica, muscovite, white lead, titanium white, zinc white, lithopone, barium white, barium white, aluminum hydroxide, alumina white, silver, or any combination of two or more thereof.

In the present invention, when the composition for forming the inner layer or the outer layer is melted for the first time, it is melted in the gelation state at 106 to 112 ° C, gel state at 116 to 122 ° C, (Sol) state and 136 ~ 141 ° C in a stepwise manner so as to be in a sol state, and then extruded in a blown film molding apparatus.

Further, in the present invention, the inner layer and outer layer which are first extruded in the above-mentioned blown film forming apparatus are plasticized and drawn out by water-cooling.

In the present invention, when a difference in pressure between the outside and the inside of the garbage bag is generated, the pin is opened in a low pressure direction so that the inside air is discharged to the outside and the freshness of the package is maintained.

In addition, according to the present invention, heat and moisture are discharged through the pin valve, so that water droplets are not formed in the inside of the garbage bag, thereby preventing the propagation of mold in the package.

The present invention also relates to a process for producing a thermoplastic resin composition, which comprises melting the composition in a stepwise manner so that the first melting of the composition becomes a gel state, a gel state, a solation state and a sol state in an extruder, It is possible to form the inner layer and the outer layer with good shape by being extruded from the apparatus.

In addition, the present invention has an effect that the inner layer and the outer layer which are first extruded in the blown film forming apparatus are drawn out by water-cooling to be drawn out, and the inner layer and the outer layer film can be drawn out easily.

In addition, the present invention is based on the discovery that biodegradable compounds are completely biodegradable without using any synthetic resin such as polyethylene (PE) or the like, and they do not collect waste bags after use, Carbon dioxide (CO 2) is reduced by about 30%, dioxin is not generated, and soot is not generated.

Further, the present invention has an effect that the color of the inner layer and that of the outer layer are different from each other, thereby making it possible to distinguish between the inner and outer surfaces at the time of use.

In addition, the present invention recognizes the color of the outer layer when the user reuses the inner layer, so that the inner layer and the outer layer are not used.

Further, the present invention has the effect of enhancing the visibility by complementing the colors of the inner and outer layers due to the different colors of the inner and outer layers.

Further, the present invention is constituted by 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT) and 5 to 20 parts by weight of polybutylene succinate adipate (PBSA), which are excellent in mechanical strength and flexibility.

In addition, the present invention has an effect that calcium carbonate (CC) is contained in polybutylene adipate terephthalate (PBAT) and polybutylene succinate adipate (PBSA) to prevent the packaging film from tearing in the machine direction.

In addition, the present invention has an effect that the period of the biodegradability is controlled by adjustment of the acid value of 1.7 to 2.3 so that the distribution period is controlled in an atmosphere having a low moisture content.

Figure 1: Conceptual diagram of production of general plastic packaging film.
2 is a cross-sectional view of a blown film forming apparatus for producing the present invention;
3 is a conceptual view of a dispensing furnace and an outflow furnace of a blown film forming apparatus for producing the present invention.
4 is a partial cross-sectional view of a blown film forming apparatus for producing the present invention;
5 is a state diagram of an extruder producing the present invention.
Figure 6 is a state diagram of a perforator producing the present invention.
Figure 7: Photograph of a black and white biodegradable packaging film used in one embodiment of the present invention before forming a pin valve.
8 is a state diagram of a biodegradable packaging film having a pin valve according to the present invention.
Figure 9: State diagram of the present invention.

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

The synthetic resin packaging film can be produced by heating the extruder 1 at 160 to 220 ° C. with a heater provided in the extruder 1 and then heating the extruder 1 to heat the extruder 1 A synthetic resin chip as a raw material of a molten resin is supplied to a hopper of the extruder 1 to melt the synthetic resin chip directly into a sol state and then the molten resin is extruded into a screw and discharged to a blown film forming apparatus 2 The discharged molten resin is expanded into a cylindrical shape while being cooled by the air blown by the blowing air of the air ring by the blown film forming device 2 and blown into the cylindrical blown film 3 And the raised blown film 3 is gradually folded into a two-ply film by the guide plate 4 and is completely folded while passing between the narrowing rollers 5 to form a two-fold film, Folded by side folding machines 30 having a triangular shape during conveyance and then folded side by side so as to be inwardly folded while being passed through a pair of rollers to form a side surface, On the winding-up reel 7 on the winding surface, it is formed of a multi-layer roll film, that is, a packaging film.

At this time, an equal number of extruder 1 corresponding to the number of layers of the synthetic resin packaging film is constituted, and the synthetic resin chips of the film layer are supplied for each hopper to melt the synthetic resin for each extruder 1, The film is cooled in a blowing air of the air ring to be discharged into a packaging film, and the packaging film is folded by the side folding machine 30 during the transportation to reduce the width thereof The multi-layer packaging film wound on the take-up reel 7 is made into a garbage bag in a separate garbage bag molding device (not shown) composed of a fusing and cutting machine, a processing machine and the like.

The fusing and cutting machine is constituted by a fusing bar consisting of a bed, a cutting blade and a heater in a direction perpendicular to the conveying direction of the packaging film, and a packaging film being conveyed along the conveying line is lifted by the fusing bar on the bed, One end of the packaging film is sealed or cut at the same time as the sealing. The processing machine processes the packaging film containing the upper fusion portion by processing a handle or an inlet on the packaging film sealed or cut at one end to complete the garbage bag.

The biodegradable garbage bag 10 having the fin valve of the present invention can be used in the form of polybutylene adipate-co-terephthalate (PBAT), polybutylene succinate-co-butylene adipate (PBSA) ) Is filled with an inorganic substance such as calcium carbonate (CC: Carbonate), the carbon dioxide (co2) is reduced by about 30% as compared with polyethylene (PE), and dioxin is not generated and soot is not generated So that environmental pollution can be prevented.

The biodegradable garbage bag 10 having the fin valve is composed of a biodegradable compound without using synthetic resin such as polyethylene (PE) at all. After a lapse of a predetermined time, the biodegradable garbage bag 10 is completely biodegraded by microorganisms in a natural state, It is not necessary to collect the packaging pouch after using it as a bag, so labor force is reduced and a fin valve (13) is formed to discharge heat and moisture inside, so that water droplets do not form inside the packaging pouch, So that the propagation of fungi in the package is restricted.

The biodegradable garbage bag (10) having the fin valve is prepared by mixing polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) and mixing the biodegradable compound with a pigment And an outer layer 12 of chromatic or achromatic color different from that of the inner layer 11 and which are formed at regular intervals on the two films and have a tear gap and a plate- (13).

The biodegradable garbage bag 10 having the pin valve is formed by first melting the composition of the inner layer 11 and the outer layer 12 by the first extruder 81 and the heater 84 of the second extruder 82, Melted and produced by stepwise heating in a gel state, a gel state, a soled state, and a sol state in the first extruder 81 and the second extruder 82, Envelopes, department store envelopes, food packaging bags, one-time packaging bags, life and food garbage bags.

Since the biodegradable garbage bag 10 having the fin valve of the present invention is composed of the inner layer 11 and the outer layer 12 of the film having different colors, the apparatus for molding the biodegradable garbage bag 10 having the fin valve 13 A first extruder 81 for extruding the first molten resin and a second extruder 82 for extruding the molten resin forming the outer layer 12, that is, the second molten resin, forming the inner layer 11, And the first extruder 81 and the second extruder 82 are constituted by a supply section, an extruding section, and a power section.

The hopper 87 supplies a biodegradable resin chip filled with a pigment and a biodegradable resin chip which is a raw material of a molten resin at room temperature to the extruding portion, And is discharged into the cylinder 88 of the extrusion portion by gravity through the outlet of the lower portion of the hopper 87.

The screw extruder is composed of a screw 83, a cylinder 88 and a heater 84. The screw 83 has a cylindrical screw shaft to be rotated, a helical wing integrally formed on the outer circumferential surface of the screw shaft, A cylinder 88 having an inner diameter adjacent to the outer diameter of the spiral wing and a heater 84 constituted by a heating plate surrounding the outer circumferential surface of the cylinder 88 and connected to a power source to generate heat by a power source, Thereby forming an outlet for discharging the resin.

The power unit is composed of a speed reducer 85 and a motor 86. The motor 86 is operated by a power source and the speed reducer 85 is connected to a rotation shaft of the motor 86, A control unit (not shown) for controlling the heater 84 and the motor 86 is separately provided.

 When the biodegradable resin is filled in the hopper 87, when the biodegradable resin reaches the extruded portion through the outlet of the hopper 87, the biodegradable resin is supplied to the motor (not shown) by rotation of the motor 86, 86 are rotated.

The plastic film used in general synthetic resin garbage bags is supplied with a synthetic resin chip through the cylinder and melted immediately after the cylinder of the extruder is heated sufficiently at 160 to 220 ° C. at which the synthetic resin chip is melted by the heater before the motor starts to operate. The biodegradable garbage bag 10 having a fin valve or the one produced by being extruded and produced in the blown film forming apparatus 2 by being transported to the blown film forming apparatus 2 by the rotation of the screw can be used as the inner layer 11 and the outer layer 12) When the composition is first melted, the first extruder 81 and the second extruder 82 heat the gel in the first extruder 81 and the second extruder 82 by the heater 84 of the second extruder 82, Is melted and produced by gradually heating by a control unit (not shown) so as to be in the state of a gel, a state of solification, and a state of sol.

The biodegradable garbage bag 10 having the fin valve is prepared by mixing 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 40 to 90 parts by weight of polybutylene succinate adipate (PBSA) in the hopper 87 of the first extruder 81, ) And 5 to 40 parts by weight of calcium carbonate (CC), and 5 to 9 parts by weight of a chromatic or achromatic pigment are mixed with 100 parts by weight of the mixture to obtain a composition wherein the acid value of the composition is 1.7 to 2.3, 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA), and 50 to 50 parts by weight of polyvinyl alcohol adipate are mixed in a hopper of a second extruder 82, 5 to 40 parts by weight of calcium (CC) is mixed with 5 to 9 parts by weight of a chromatic or achromatic pigment having a different color from the pigment introduced into the hopper 87 of the first extruder 81 with respect to 100 parts by weight of the mixture (KOH) was added so that the acid value of the composition was 1.7 to 2.3 .

The first extruder 81 and the second extruder 82 are connected to a motor 86 through a feed pump 84 and a composition of a feedstock fed into the hopper 87 of the first extruder 81, The composition and potassium hydroxide (KOH) injected into the hopper 87 of the second extruder 82 are fed to the rotation of the motor 86 by the rotation of the screw 83 by the rotation of the motor 83 So that it is filled in the cylinder 88. In this case, as shown in Fig.

The melted resin in the first extruder 81 is referred to as a first molten resin and the first molten resin forms an inner layer 11 which is a chromatic or achromatic film of the biodegradable garbage bag 10, The melted resin is called a second molten resin and the second molten resin forms an outer layer 12 which is a chromatic or achromatic film different from the inner layer of the biodegradable garbage bag 10.

The biodegradable garbage bag 10 having the fin valve has different colors of the inner layer 11 and the outer layer 12 so that it is possible to distinguish the inner and outer surfaces at the time of use and when the user reuses the outer layer 12, The inner and outer layers 11 and 12 are not turned over and the colors of the inner and outer layers 11 and 12 are complemented by different colors of the inner and outer layers 11 and 12 to enhance visuality .

For example, if the outer layer 12 is black and the inner layer 11 is white, then the outer layer 12 is black, and the permeation of external light is reduced, And the inner layer 11 becomes white due to the inner part being bright, so that the packaged package becomes visible.

The temperature of the heater 84 is raised by the control of the control unit (not shown) so that the first composition filled in the cylinder 88 of the first extruder 81 and the second extruder 82, And each of them is melted in a state of being in a gel state after being heated to 106 to 112 ° C. Here, the state of gelation refers to a state in which the molten solution of the composition filled in the cylinder 88 and potassium hydroxide (KOH) , That is, a state before solidification in a semi-solid state, and the composition is difficult to melt in a gelated state at 105 ° C or less.

Each of the melted melts in the cylinders 88 of the first extruder 81 and the second extruder 82 is heated to raise the temperature of the heater 84 under the control of a control unit The gel state is melted at a temperature of 122 DEG C and the gel state means that the molten solution of the composition filled in the cylinder 88 and potassium hydroxide (KOH) is melted in a jelly, (Sol) in a state of being dispersed in a gelatinous state as a jelly-like solid, but it is a viscous solid state which is dull and uneven. The composition is a gel (gel) state at a temperature of 113 to 115 ° C. Gel state, so that the distinction between the state of gelation and the state of gel does not become clear.

Each of the melts in the gel state in the cylinders 88 of the first extruder 81 and the second extruder 82 raises the temperature of the heater 84 under the control of a control unit The solubilized state refers to a state in which the molten solution of the composition filled in the cylinder 88 and the molten solution of potassium hydroxide (KOH) are dispersed and has a fluidity to some extent But it is in the state before the viscoelastic fluid, that is, between the gel and the sol, and the composition goes from the gel state to the solubilized state at 123 to 125 ° C., And the state of solitude (solification) is not clarified.

Each of the melted melts in the cylinders 88 of the first extruder 81 and the second extruder 82 increases the temperature of the heater 84 by the control of a control unit (Sol) state at a temperature of 141 DEG C where the sol state means that the molten solution of the composition filled in the cylinder 88 and potassium hydroxide (KOH) is completely dispersed and has a fluidity Refers to a state of a viscoelastic fluid such as paint as a sol state, and the composition is liquefied at a temperature of 142 ° C or higher, making it difficult to melt the sol state.

The time for gradually heating the composition forming the inner layer 11 or the outer layer 12 to a gel state, a gel state, a solubilized state, There is a difference depending on the amount of the composition filled in the cylinder 88 of the first extruder 81 and the second extruder 82 so that the heating time is not limited.

The biodegradable resin of the polybutylene adipate terephthalate (PBAT) and the polybutylene succinate adipate (PBSA) melts at a melting temperature of 160 to 220 ° C of the synthetic resin, and is extruded in the blown film forming apparatus 2 I can not.

This is because the polybutylene adipate terephthalate (PBAT) and the polybutylene succinate adipate (PBSA) are in a state in which the molten solution becomes a liquid such as water at a temperature of 143 ° C or higher, The liquid molten solution reaches the blown film forming apparatus 2 in the liquid state in the cylinders 88 of the first extruder 81 and the second extruder 82 even when the molten liquid is extruded by the rotation of the screw 83 The tube-shaped blown film 3 can not be formed by flowing from the upper surface of the film forming apparatus 2. [

Therefore, the biodegradable garbage bag 10 is in a gelated state in the first extruder 81 and the second extruder 82 when the composition for forming the inner layer 11 or the outer layer 12 is first melted, The film is transferred to the blown film forming apparatus 2 as soon as it is warmed up to the gel state and then to the sol state after being gradually warmed to the gel state and the solitated state, And the composition for forming the inner layer 11 or the outer layer 12 continuously injected through the hopper 87 is melted in the sol state and extruded in the blown film forming apparatus 2 .

The stepwise heating shortens the sol state melting time of the composition to minimize the liquid state of the molten composition extruded from the first extruder 81 and the second extruder 82, The state can be maintained smoothly, thereby preventing partial extrusion defects in the blown film forming apparatus 2.

There may be a method of controlling the temperature of the whole of the heater 84 constituted in the first and second extruders 81 and 82 by the same method as the stepwise heating of the composition as described above, The heater 84 adjacent to the hopper 87 is controlled to a temperature at which the composition is melted in a gelated state and a gap is formed in the hopper 87 The temperature of the last heater 84 is controlled to be a temperature at which the final heater 84 is melted in the sol state.

In other words, the temperature of the heater 84 adjacent to the blown film forming apparatus 2 is controlled so that the temperature is gradually increased toward the blown film forming apparatus 2 so that the temperature is controlled so that the composition melts in the sol state The composition is injected into the cylinder 88 and then melted stepwise into a gelated state, a gel state, a solitated state, a sol state, and is fed to the blown film forming apparatus 2 And the first and second molten resins enter the sol state and are extruded into the blown film forming apparatus 2 to be molded into the blown film 3.

The biodegradable garbage bag 10 is formed by first melting the composition forming the inner layer 11 or the outer layer 12 in the gelation state and the gel state in the first and second extruders 81 and 82, Melted in a stepwise manner so as to be in a solubilized state and in a sol state, and then extruded in an integrated manner in the blown film forming apparatus 2, so that the film can be molded well.

A packaging film in which the first molten resin and the second molten resin, that is, the inner layer 11 and the outer layer 12 are laminated together and extruded first, in other words, the first blown film 3, It is plasticized and drawn out by water cooling.

The first molten resin and the second molten resin which are extruded most extensively in the blown film forming apparatus 2 are in a sol state and are extruded but are inferior in extrusion compared with general synthetic resins and plasticization is delayed, 3 can not be guided artificially by the operator to the guide plate 4 and the stitching roller 5.

To solve this problem, when water is applied to the upper surface of the blown film forming apparatus 2 as soon as the first blown film 3 is extruded into the blown film forming apparatus 2, As the temperature of the surface is lowered rapidly than the air is cooled, the initial blown film 3 is also plasticized as the temperature is lowered rapidly than air is cooled, and the plasticized original blown film 3 is artificially Is guided to the guide plate 4 and the stitching roller 5 and is expanded by the blowing air to be led to the guide plate 4 and the stencil roller 5 and then melt extruded into a sol state at 136 to 141 캜 The continuous blown film 3 can be extruded and produced.

The composition is melted by the temperature of the heater 84, melt extruded in the cylinder 88 by rotation of the screw shaft, transferred to the outlet, completely melted before reaching the outlet, ).

The blown film forming apparatus 2 includes a lower die 24 connected to the first extruder 81 and the second extruder 82 and a middle die 23 formed at an upper portion of the lower die 24 An upper die 22 is formed on the upper part of the middle dice 23 and a nozzle 21 is formed on the upper part of the upper die 22.

The lower die 24 is connected to the first extruder 82 and the second extruder 82 which communicate with the first extruder 81 and the first molten resin melted in the first extruder 81 flows in and out, And the second molten resin that is melted in the second extruder 82 flows into the second outflow path e and flows out to the outside of the upper part. The first outflow path (d) and the second outflow path (e) But not in the lower die 24.

The middle dice 23 is communicated with the first outflow path d of the lower die 24 and flows into the first distribution furnace through the first molten resin, (g) which communicates with the second outflow path (e) of the lower die (24) and flows out of the second molten resin to the outside and is distributed to the plurality of second resins (b) .

The middle dies 23 introduce the first molten resin and the second molten resin into one distribution furnace, respectively, so that the first molten resin and the second molten resin are distributed and discharged respectively in a plurality of them, (f) and the plurality of second distribution paths (g) do not meet in the middle dice (23).

The upper die 22 is connected to a plurality of first distribution paths f of the middle dice 23 and includes a plurality of first resins a and a plurality of second dies 23 of the middle dice 23, (A) and a second resin (b) are arranged so as not to meet each other in the upper die (22), and a plurality of second resins (b) communicating with the distribution path (g) do.

The upper dies 22 are formed by arranging a plurality of first resins each having a certain interval therebetween and having a circular cross section such that the arranged cross sections are arranged in a YY cross section and each of the plurality of second distribution paths A plurality of first resins are formed in a circular array such that the arranged cross sections are spaced apart from each other in the radially outward direction and arranged in a YY section.

The nozzle 21 is constituted by a plurality of first resin (a) and a second resin (b) communicating with each other at the same time, and an upper and lower extrusion path (c) is formed. In the extrusion path (c) the first molten resin and the second molten resin flowing out from the first resin (a) and the second resin (b) are laminated and extruded out to one double film.

The molten resin of the chromatic color or achromatic color melted in the first extruder 81 flows out to the first outflow path d of the lower die 24 and is distributed in the first distribution path f to a plurality of the middle dies 23 (A) of the upper die 22 and flows out to the extrusion path (c) of the nozzle 21 and is different from the molten resin of the chromatic or achromatic color and melted in the second extruder 82 The melted or achromatic molten resin melted in the first extruder 81 flows out to the second outflow path e of the lower dice 24 and is distributed to the middle portion of the middle dice 23 in the second distribution path g, Is discharged to the second resin (b) of the upper die (22) and flows out to the extrusion path (c) of the nozzle (21), and the first molten resin and the second molten resin are laminated in the extrusion path (c) The first molten resin is extruded and discharged so as to constitute the chromatic or achromatic inner layer 11 of the biodegradable garbage bag 10 and the second molten resin becomes the inner layer of the biodegradable garbage bag 10 11 and a chromatic or achromatic outer layer 12 different from the chromatic or achromatic outer layer 12.

The molten resin extruded from the nozzle 21 is extruded to be a small-diameter blooming film 3, which is upwardly extruded. The small-diameter blown film 3, which is extruded upward through the nozzle 21, The blowing air of the air ring blown from the blower is expanded and cooled by the air pressure supplied to the inside of the small-diameter blown film 3 to be blown, and the blown film 3 of the constant diameter continuously forms the wrapping film do.

A pin valve 13 is formed by a perforator 50 before the folded side of the blown film 3 is folded by the side folding machine 30 and then wound on the take-up reel 7, and the pin valve 13 Is formed so that the inner layer 11 and the outer layer 12 of the biodegradable garbage bag 10 are vertically and integrally formed.

That is, the film having passed through the side folding machine 30 is wound on the take-up reel 7 which finally rotates by the guide of the rollers 6 after the fin valve 13 is formed by the perforator 50, .

The fin valve 13 of the biodegradable garbage bag 10 having the fin valve communicates with the inside and the outside of the biodegradable garbage bag 10 to discharge heat and moisture from the inside of the garbage bag to form water droplets inside the biodegradable garbage bag 10 having the fin valve And the propagation of fungi on the packaging is restricted.

The pin valve 13 has an increased area from the center of the tear gap 15 and the gap 15 to the edge and is formed of a plate 14 having a diameter of 0.3 to 1.3 mm, 1,000 mm. The dimension limitation of the pin valve 13 serves to protect the flow and quality of the package wrapped in the biodegradable garbage bag 10 having the fin valve with the pin valve.

The pin valve 13 is formed by the perforation needle 53 of the perforator 50 so that the perforation needle 53 forms the inner layer 11 and the outer layer 12, that is, the tear gap 15, . The punching is carried out in such a manner that a pinch valve 13 of the present invention in which a certain portion of the inner layer 11 and the outer layer 12, that is, the film is punctured to leave no film in the perforated portion, do.

The pin valve 13 has a structure in which a perforation needle 53 is formed in the inner layer 11 and the outer layer 12 such that a needle hole is formed in the inner layer 11 and the outer layer 12, A part in which the pin valve 13 is formed is attached to the inner layer 11 and the outer layer 12 as it is, that is, when the pin 14 (fin) forms the pin valve 13, .

When the pressure difference between the outside and the inside of the biodegradable garbage bag 10 having the fin valve 14 formed with the pin valve 13 is formed, the pin 14 is pressurized by the tearing gap 15, Is opened in a low direction to perform a valve action.

The pin 14 is separated from the central portion of the pin valve 13 and is integrally formed with the inner layer 11 and the outer layer 12 itself at the circumferential edge of the pin valve 13 and has a peripheral edge portion fixed, And the central portion acts like a wing so as to be opened and closed.

The diameter of the pin valve 13 is the maximum distance of the tear gap 15, and when the diameter of the pin valve 13 is 0.3 mm or less, the diameter of the pin valve 13 is small, When the discharge of the internal heat of the biodegradable garbage bag 10 having a fin valve is not sufficient and the diameter of the fin valve 13 is 1.3 mm or more, the biodegradable garbage bag having a pin valve It is easy to discharge the internal heat of the package 10, but the end of the packed product such as a leek is pushed out by the pin valve 13, and the packaged package is easily exposed to the visual field, resulting in a bad appearance of the package.

 The diameter of the pin valve 13 refers to the maximum distance to the circumferential edge of the pin 14, that is, the maximum distance of the tear gap 15, and the biodegradable garbage bag 10 having the pin valve is inserted into the perforation needle 53).

The hole formed in the biodegradable garbage bag 10 having the pin valve by the perforation needle 53 of the perforator 50 is formed by passing the perforated needle through the biodegradable garbage bag 10 having the fin valve, The pin valve 13 is constituted by a configuration in which the gap 15 is formed by the gap 15 and a plate-like pin 14.

The perforator 50 may be installed in the process of producing a packaging film or may be configured in a separate trash bag molding apparatus (not shown). In this case, it is preferable that the perforator 50 is constructed before the fusing and cutting.

When the spacing of the pin valves 13 is 500 mm or less, if the interval is small and the packing unit is large, the inside may be dried depending on the wrapped packages. If the interval of the pin valves 13 is 1,000 mm Or more, moisture may be generated in a part of the inner surface of the package when the package unit is small.

Korean Patent Registration No. 10-1318379 discloses a mulching film perforator comprising a rotating plate integrally rotating with a rotating shaft of a motor and a perforating knife disposed at an upper portion of the rotating plate and spaced apart from the center of the rotating shaft of the motor by a predetermined distance, And the piercing knife is rotated by the rotation of the rotating plate due to the rotation of the motor. As a result, the mulching film is pierced, and the piercing knife can not be disposed adjacent to the piercing knife due to the center pole, so that the diameter of the piercing hole can not be made small.

The mulching film perforator is a method for perforating a sowing hole on a mulching film when a plant is grown on a mulching film. Since seeds sown on the sowing hole need to be sprouted and grown, the diameter of the sowing hole must be 700 mm or more, The pin valve 13 of the present invention can not be formed as a perforator. That is, when the through hole is formed by the conventional mulching film perforator, the through hole forms a circular hole.

The perforator 50 forming the pin valve 13 includes a perforating roller 51 and a guide roller 55 having an outer circumferential surface and an outer circumferential surface adjacent to each other. The perforation roller 51 has a cylindrical body 52 and a perforation needle 53 protruding at a predetermined interval from the outer circumferential surface of the body 52. The perforation roller 53 has a circular plate- 54 and a circumferential rotary shaft passing through the center of the both side plates 54 is formed. The guide roller 52 includes a cylindrical roll body 56 and a needle groove 57 formed at a position corresponding to the perforation needle 53 on the outer circumferential surface of the scroll body 56, Like side plate 58 is formed on both side edges of the side plate 58 and a circumferential rotary shaft passing through the center of both side plates 58 is formed.

The outer circumferential surface of the guide roller 52 has a sawtooth shape by the needle groove 57 of the groove and is made of a rubber material having a predetermined elastic force so as to correspond to the needle 53.

The packaging film having passed through the side folding machine 30 passes between the perforation roller 51 and the guide roller 55 and the perforation roller 51 and the guide roller 52 are rotated by the rotation of the rotary shaft, 58 are rotated to rotate the body 50 and the body 56 so that the body 50 is rotated and the perforation needle 53 is inserted into the needle groove 57, And the pinch valve 13 is formed through the packaging film passing between the guide roller 51 and the guide roller 55.

The diameter of the perforation needle 53 is the same as the diameter of the pin valve 13, that is, 0.3 to 1.3 mm and the shape is the same shape as the needle.

The polybutylene adipate terephthalate (PBAT) is somewhat poor in melt processability and flexibility as compared with polybutylene succinate adipate (PBSA), has good mechanical strength, and is a polymer of an aromatic polyester (thermoplastic polymer) It has biodegradability which is decomposed into carbon dioxide and water by microorganisms etc. in the soil by decomposition.

The polybutylene adipate terephthalate (PBAT) is an aromatic polyester resin comprising a first repeating unit represented by the following formula (1) and a second repeating unit represented by the following formula (2), and has a weight average molecular weight of 80,000 to 300,000 .

The polybutylene adipate terephthalate (PBAT) is commercially available from EnPol of Korea Lotte Fine Chemicals Co., Ltd., Biomax of DuPont of France, Origo-Bi of Novamont of Italy, and Easter Bio of Eastman Chemical of USA, .

Although the polybutylene succinate adipate (PBSA) has a somewhat better flexibility than polybutylene adipate terephthalate (PBAT), it lacks mechanical strength and hydrolysis rate is too fast. And is biodegradable as a polymer of an aliphatic polyester thermoplastic polymer and decomposed into carbon dioxide and water by microorganisms in the soil or the like.

The polybutylene succinate adipate (PBSA) is an aliphatic polyester resin comprising a first repeating unit represented by the following formula (3) and a second repeating unit represented by the following formula (4), and has a weight average molecular weight of 50,000 to 200,000 .

The above-mentioned polybutylene succinate adipate (PBSA) is commercially available as SG-100, SG-200 of SK General Chemical Co., Ltd., G-4460 of IRE CHEMICAL Co., Ltd. of Korea, Bionore of Japan Showa High Polymer Co., Enforu of lreChemical Co., Ltd. of Japan and Ecoflex of BASF of Germany are commercially available.

The biodegradable garbage bag 10 having the fin valve is composed of 40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) and calcium carbonate (CC) Preferably 5 to 40 parts by weight, and preferably 47 to 84 parts by weight of polybutylene adipate terephthalate (PBAT), 8 to 17 parts by weight of polybutylene succinate adipate (PBSA) and 8 to 17 parts by weight of calcium carbonate (CC) 36 parts by weight.

The biodegradable garbage bag 10 having the above-described pin valve is prepared by mixing the polybutylene adipate terephthalate (PBAT) and the polybutylene succinate adipate (PBSA) at an appropriate ratio so that the biodegradable garbage bag 10 having excellent biodegradability and mechanical strength With improved flexibility, the biodegradation period can be controlled and used as a variety of packaging films.

The biodegradable garbage bag 10 having the fin valve is composed of only a biodegradable compound based on polybutylene adipate terephthalate (PBAT) and polybutylene succinate adipate (PBSA), so that the polymer is low-molecular- Is decomposed to a size that can be fully digested, it is completely biodegraded by the metabolism of the microorganism, so that the soil microorganism is activated and not harmful to the soil ecosystem.

Since the biodegradable garbage bag 10 having the fin valve does not use a biodegradable resin such as polyethylene (PE) or the like, the melting time of the composition is shortened and the process time is shortened, and the biodegradable garbage bag 10 is completely biodegraded, It is possible to reduce the labor force, reduce the incineration cost, and reduce carbon dioxide (CO2) by 30% as compared with polyethylene when incinerated.

Polylactic acid (PLA) is formed by polymerization of a lactide monomer obtained by fermenting biomass. This polymer resin material is very brittle, and a packaging film is produced using only polylactic acid (PLA) as a material (PLA) and thermoplastic starch (TPS) are different from each other in terms of melting temperature, so that the melting temperature (Tg) of the thermoplastic starch (TPS) The polylactic acid (PLA) becomes watery to form the packaging film and the thermoplasticization is not well performed, which makes it difficult to form the packaging film.

The biodegradable garbage bag 10 having the fin valve is made of polybutylene adipate terephthalate (PBAT) which is more thermoplastic than polylactic acid (PLA) in order to solve the problem of polylactic acid (PLA) And a polybutylene succinate adipate (PBSA) as a base.

When the biodegradable garbage bag 10 having the fin valve is made of only polybutylene adipate terephthalate (PBAT), it tends to form in the machine direction (MD), and polybutylene adipate terephthalate (PBAT) If the amount of calcium carbonate (CC) is melted and kneaded in an appropriate amount of 5 to 40 parts by weight, the mechanical strength of the film is increased and no formation occurs.

That is, the packaging film composed of the polybutylene adipate terephthalate (PBAT) and the polybutylene succinate adipate (PBSA) tears in the machine direction (MD), but the biodegradable garbage bag (10) The polybutylene adipate terephthalate (PBAT) and the polybutylene succinate adipate (PBSA) contain calcium carbonate (CC) and are prevented from tearing in the machine direction (MD).

If the amount of calcium carbonate (CC) is less than 5 parts by weight, the toughness, strength and softness of the film become inferior. When the amount of calcium carbonate (CC) is 40 parts by weight or more, the biodegradable garbage bag The strength is increased but the flexibility and adhesiveness are lowered.

The aromatic / aliphatic polyester-based biodegradable resin such as polybutylene adipate terephthalate (PBAT) and polybutylene succinate adipate (PBSA) can be produced by increasing the molecular weight by using an isocyanate chain extender, The biodegradable garbage bag 10 having a fin valve has increased mechanical strength by allowing calcium carbonate (CC) to act as a chain extender of isocyanates.

When the biodegradable garbage bag 10 having the pin valve is composed of only polybutylene adipate terephthalate (PBAT), it tends to form in the running direction (MD: machine direction), and polybutylene adipate terephthalate When the proper amount of 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) and 5 to 40 parts by weight of calcium carbonate (CC) is melt-kneaded in 40 to 90 parts by weight of polybutylene terephthalate (PBAT) I will not.

The biodegradable garbage bag 10 having the fin valve tears in the machine direction MD so that the formation of calcium carbonate CC is stopped at the place where the calcium carbonate CC exists, When the adipate terephthalate (PBAT) and the polybutylene succinate adipate (PBSA) serve as a bond to bind calcium carbonate (CC) and decompose, the calcium carbonate (CC) falls off, , And even when calcium carbonate (CC) is left in the soil, it improves the acid soil and supplies calcium and nutrients to plants and fruits.

The above-mentioned calcium carbonate (CC) is a main component of calcareous fertilizer and serves to improve the acidic soil and to supply the calcium component to plants and fruits, and also to provide a calcium component such as limestone, marble, calcite, bamboo, chalk, Shell, egg shell, and coral. The calcium carbonate (CC) is formed in the form of an acicular, a triangular, a hexahedron, a sphere, a plate or a prism.

The above-mentioned calcium carbonate (CC) is divided into a dry product (powder) according to whether it contains water or not, and according to the physicochemical treatment method, the calcium carbonate (PCC: Precipitated Light Calcium Carbonate) and the heavy calcium carbonate : Ground Calcium Carbonate), and dry calcium carbonate (GCC), which does not have any chemical reaction, is used.

The calcium carbonate (CC) has a particle size of 1.7 to 3.5 μm, and the particle size of the calcium carbonate (CC) is preferably 0.6 to 2.3 μm. If the amount of the calcium carbonate (CC) particles is less than 1.7 m, the surface of the biodegradable garbage bag 10 having a fin valve becomes smooth, but the processing of the calcium carbonate (CC) becomes difficult and the unit price of the calcium carbonate , And the calcium carbonate (CC) particles are 3.5 μm or more, the surface of the biodegradable garbage bag 10 having the fin valve is very rough. The surface of the biodegradable garbage bag 10 having a fin valve is suitably smooth while the production cost is low and the particle size of the calcium carbonate (CC) is 1.7 to 3.5 μm.

The heavy calcium carbonate (GCC) fine powder can be obtained by mixing raw ore ore with a raw material such as Jaw Crush, Roll Crush, Hammer Mill, Rod Mill, Ball Mill or Cone Crusher ) Or the like, or a dry grinding process in which raw ore is crushed by using a jaw crush, a roll crush, a hammer mill, a rod mill, a ball mill or a cone After crushing repeatedly by using a crusher or the like, the slurry is passed through a wet cyclone to concentrate the slurry of the fine particles selected by the wet centrifugal separator to prepare wet crushed calcium carbonate, or the slurry is spray- After the wet grinding process using a spray-dryer, the calcium carbonate (CC) is classified through the vibration screen or the classifier so that the average particle size is 1.7 to 3.5 μm.

Classification is a method of separating solid particles by particle size, in which fine pulverized calcium carbonate (CC) powder is sieved by a fine sieve mesh or a pulverized calcium carbonate (CC) By separating the coarse particles through the classifier using the difference, the amount of coarse particles is reduced to obtain a fine calcium carbonate (CC) powder having a good particle size distribution.

The biodegradable garbage bag (10) having the fin valve has an acid value of 1.7 to 2.3. When the acid value is less than 1.7, the biodegradation rate of the biodegradable garbage bag 10 having the fin valve is slowed down and can not be decomposed even after the distribution period. When the acid value is 2.3 or more, the biodegradation rate is very fast, And the distribution period is shortened.

The acid value is the amount of the acid component in the biodegradable garbage bag 10 having the fin valve and is the number of potassium hydroxide (KOH: potassium hydroxide) necessary for neutralizing the acidic component of 1 g of the sample in mg unit, The acid value is controlled by the addition of potassium hydroxide (KOH) used as a catalyst to a mixture of phenol terephthalate (PBAT) and calcium carbonate (CC). Generally, the hydrolysis stability is better as the acid value is lower, .

The potassium hydroxide (KOH) is a white solid of an inorganic compound, and has strong property of absorbing moisture and carbon dioxide, and has a high solubility of potassium carbonate which is generated when water and carbon dioxide are absorbed, and 1, 2 and 4 water flames exist. 35.5 캜 and -32.7 캜, respectively, and the transition temperature therebetween is 32.5 캜 and -33 캜.

In addition to potassium hydroxide (KOH), sodium hydroxide, calcium hydroxide, sodium carbonate anhydrous and potassium carbonate anhydrous may be used as the alkali catalyst, It is determined by mixing more than one species and it is easy to adjust the acid value.

The amount of the alkali catalyst to be added is 0.07 to 0.13 parts by weight based on 100 parts by weight of a mixture of polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) .

When the addition amount of the alkali catalyst is less than 0.07 part by weight, the acid value of the mixture of polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) becomes 2.3 or more, When the addition amount of the catalyst is 0.13 parts by weight or more, the acid value of the mixture of polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) is 1.7 or less.

The biodegradable garbage bag 10 having the fin valve is prepared by mixing 100 parts by weight of a mixture of polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) 0.05 to 0.45 part by weight of the antioxidant, and preferably 0.09 to 0.40 part by weight of the antioxidant.

If the antioxidant is less than 0.05 part by weight based on 100 parts by weight of the mixture of adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC), the plate- a blooming phenomenon occurs. When the antioxidant is 0.45 part by weight or more, the biodegradable garbage bag 10 having a pin valve is stabilized in color at a high temperature at the time of melt extrusion, so that there is no blooming phenomenon, Oxidation is suppressed.

The antioxidant may be a conventional synthetic compound such as hindered phenol, hindered amine, sulfur compound, phosphorus compound or the like, natural compound of ascorbic acid or its derivative or apple compound. Representative examples of the hindered phenol antioxidant include tetrakis (methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) methane (Tetrakis (3,5-di-tert-butyl-4-hydroxyphenyl) propionate methane, octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) or a combination thereof.

Further comprises 5 to 15 parts by weight of ceramics to 100 parts by weight of the mixture of polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) The ceramic is composed of 8 to 13 parts by weight of ceramic powder having a particle size of 200 to 600 mesh and preferably 300 to 400 mesh.

When the amount of the ceramic is less than 5 parts by weight, the strength of the product is lowered and the strength of the product is lowered. When the amount of the ceramic is more than 15 parts by weight, the strength is increased but the decomposition time is long. When the ceramic particle size is less than 200 mesh, The surface roughness of the packaging film becomes poor due to the large particle size. When the ceramic is more than 600 mesh, the surface area of the particles is large, so the far infrared ray radiation effect is enhanced and the workability is good.

The ceramic may be selected from the group consisting of phyllite, quartz, white mica, sericite, iron, magnesium, chlorite, garnet, chloritoid, muscovite, biotite, Alumina, silicon dioxide, magnesium oxide, sodium oxide, aluminum oxide, aluminum oxide, aluminum oxide, aluminum oxide, aluminum oxide, aluminum oxide, aluminum oxide, albite, sphene, apatite, tourmaline, graphite, Titanium dioxide, zirconia, silicon carbide. Silicon nitride, barium titanate, and the like.

Further comprises 5 to 9 parts by weight of a chromatic or achromatic pigment relative to 100 parts by weight of the mixture of polybutylene adipate terephthalate (PBAT), polybutylene succinate adipate (PBSA) and calcium carbonate (CC) 7 to 8 parts by weight.

When the amount of the pigment is less than 5 parts by weight, the color of the packaging film becomes lighter and the amount of sunlight is increased or the clarity of the package is weakened. When the pigment is more than 8 parts by weight, the color of the packaging film is good, The production unit price becomes expensive.

The pigments are prepared by using coarse particles or generally known metal powder pigments, inorganic pigments and organic pigments which are powdered and used in the form of oyster shell white, that is, clamshell, chalk, calcium carbonate (calcium carbonate carbonate, kaolin, gypsum, marble dust, such as marble dust, talc, diatomaceous earth, pumice, Quartz, silica, chalcedony, mica, mica, muscovite, white lead, and so on. In addition, Titanium white, zinc white, lithopone, barium white, aluminum hydroxide, alumina white, silver, aluminum powder, Bronze, copper, carbon black, cobalt green, cobalt blue, yellow ocher, red oxide Oxidize red iron, Viridian, Cadmium yellow, Ultra marine blue, TiO2, Iron oxide green and Hansa yellow. And the color of the inner layer (11) and the outer layer (12) of the packaging film is determined by the colored pigment by using a colored pigment by coloring a chromatic color or an achromatic color by using at least one selected from the group consisting of

The pigment is composed of powder having a particle size of 200 to 600 mesh. When the particle size is less than 200 mesh, the particle size of the powder is large and the surface roughness of the biodegradable garbage bag 10 having the fin valve is poor. When the particle size is more than 600 mesh, the surface roughness is good, Precision milling must be performed, so that the processing cost becomes high and there is a high possibility that the fine particles will scatter into the air during machining and the workability is inferior.

When the biodegradable resin chip and the pigment are simultaneously fed into the hopper 87 of the first and second extruders 81 and 82 as a powder having a particle size of 200 to 600 mesh, And the biodegradable resin chip are not mixed with each other, the blown film 3 produced by the blown film forming apparatus 2 may be colored differently depending on the position.

Therefore, in order to solve this problem, a biodegradable resin chip is colored with a chromatic or achromatic pigment, and a colored biodegradable resin chip is used in a composition for forming an inner layer 11 and an outer layer 12. The coloring is performed by a known method And a description thereof will be omitted.

The colored biodegradable resin chip uses the same polybutylene adipate terephthalate (PBAT) or polybutylene succinate adipate (PBSA) as the composition of the present invention, and the composition ratio of the composition of the present invention is polybutyl (PBA), polybutylene succinate adipate (PBSA) and colored polybutylene adipate terephthalate (PBAT) or polybutylene succinate adipate (PBSA) are added and applied.

The biodegradable garbage bag 10 having the fin valve may be made of a material such as polycaprolactone (PCL), polybutylene succinate (PBS), polybutylene adipate (PBA) A biodegradable resin derived from a natural product, and a biochemical biodegradable resin derived from a natural product.

The biodegradable garbage bag 10 having the above-described pin valve may contain various additives such as a lubricant, a flame retardant, an antistatic agent, a heat stabilizer, a light stabilizer, an ultraviolet absorber and an antiblocking agent to the extent that the purpose of the present invention is not impaired Be compounded

The polybutylene adipate terephthalate (PBAT) is commercially available from Korea Lotte Fine Chemicals Co., Ltd., EnPol, and the polybutylene succinate adipate (PBSA) is commercially available from SK Chemical Co., The biodegradable garbage bag (10) having the following properties was evaluated as follows according to the examples.

(1) Acid value

0.3 g of the resin was dissolved in 20 ml of chloroform, and the solution to which ethanol was added was titrated with 0.1 N potassium hydroxide (KOH) in an autotitrator to calculate an acid value.

(2) Tensile strength, tear strength and elongation

7.6 Tensile Strength and Elongation of KS M 3503 The tensile strength (kgf / ㎠), tear strength (kgf / cm) and elongation (%) of the specimen were measured according to the test method, (TD) perpendicular to the longitudinal direction (MD), and the lowest value was taken.

(3) Biodegradability

KS M 3100-1 The amount of carbon dioxide generated from the standard sample (cellulose) and the test sample was measured and evaluated by a method of measuring the aerobic biodegradability of the plastic under composting conditions.

Biodegradability (%) = (amount of generated carbon dioxide / theoretical amount of carbon dioxide) * 100

The biodegradable garbage bag 10 having the above-described pin valve was manufactured by using a film molding machine (Daerun Machinery Co., Ltd., model: 50 mm HD / PE FILM M / C) to adjust the temperature of the extruder in the range of 106 to 141 캜, The black film having a thickness of 20 탆 was cut at an extrusion speed of 550 rpm, a feed rate of 110 rpm, and a roll speed of 220 rpm, and the compositions for Examples 1 to 6 of the present invention are shown in Table 1 below.

The acid value according to the embodiment of the present invention is shown in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Acid value 2.5 2.3 2.1 1.9 1.7 1.5

Table 2 shows the compositions according to the examples of the present invention.

                                                                 Unit: parts by weight division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 PBAT 82.7 82.0 77.0 71.0 65.0 60.1 PBSA 4.5 6.7 8.0 10.3 12.5 14.4 Calcium carbonate 12.8 11.3 15.0 18.5 22.5 25.6 Pigment 5.0 5.5 6.0 6.5 7.0 7.5

* Pigments are in parts by weight relative to 100 parts by weight of PBAT, PBSA and calcium carbonate.

The results of physical property evaluation according to the embodiment of the present invention are shown in Table 3 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 The tensile strength
(kgf / cm2) TD 638 635 632 628 626 617 MD 626 622 618 623 610 599 Phosphorus strength
(kgf / cm) TD 299 295 292 288 284 276 MD 257 255 251 247 241 228 Elongation (%)
TD 704 706 708 710 715 718 MD 256 261 261 263 279 269 Biodegradability (25 days,%) 81 76 73 70 67 65

* The evaluation of properties is for the part without the pin valve (13).

As shown in Table 3, Examples 1 to 6 according to the present invention have a tensile strength of 599 to 626 kgf / cm 2 in the machine direction (MD), a tear strength of 228 to 257 kgf / cm and an elongation of 256 to 269% It was confirmed that the biodegradability at 25 days was as good as 65 to 81% and the biodegradability was different depending on the acid value without lowering the tensile strength and elongation.

The terms or words used in the specification and claims of the present invention are not to be construed in a conventional or dictionary sense and the inventor can appropriately define the concept of the term in order to explain its invention in the best way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments described in the detailed description of the present invention and the configurations shown in the drawings are only the most preferred embodiments of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, It should be understood that variations may or may not be present and are to be determined by equivalents to the claims.

1: extruder 2: blown film forming device
3: blown film 4: guide plate
5: Stencil roller 6: Auxiliary roller
7: Winder
10: Biodegradable garbage bag with pin valve
11: inner layer 12: outer layer
13: Pin valve 14: Pin
15: break 30: side folding machine
21: nozzle 22: upper die
23: Central die 24: Lower die
50: Perforator 51: Perforation roller
52: chinrol body 53: perforated needle
54, 58: side plate 55: guide roller
56: body and body 57: needle groove
81: First extruder 82: Second extruder
83: screw 84: heater
85: Reduction gear 86: Motor
87: hopper 88: cylinder
a: first resin b: first resin
c: extrusion d: first outflow path
e: second outflow path f: first distribution path
g: second distribution l: pin valve clearance

Claims (7)

40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) and 5 to 40 parts by weight of calcium carbonate (CC) A chromatic or achromatic inner layer composed of a composition of 5 to 9 parts by weight of pigment and having an acid value of 1.7 to 2.3 and melted by a first extruder;
40 to 90 parts by weight of polybutylene adipate terephthalate (PBAT), 5 to 20 parts by weight of polybutylene succinate adipate (PBSA) and 5 to 40 parts by weight of calcium carbonate (CC) 5 to 9 parts by weight of a pigment is composed of an outer layer of a chromatic or achromatic color which is composed of a composition of 1.7 to 2.3 and which is melt-formed by a second extruder and different from the inner layer;
When the composition for forming the inner or outer layer is melted for the first time, the gelation state at 106 to 112 ° C in the extruder, the gel state at 116 to 122 ° C, the soled state at 126 to 132 ° C , Melted in a stepwise manner so as to be in a sol state at 136 to 141 ° C, and then molded into an integral double film upon extrusion in a blown film forming apparatus;
The inner layer and the outer layer that are first extruded in the blown film forming apparatus are plasticized and drawn out by water cooling;
The inner layer and the outer layer are formed at regular intervals and are formed by a tear gap formed by the penetration of the perforation needle and a plate fin having the edge fixed to the inner and outer layers and increasing in area from the center of the gap to the edge, Wherein a fin valve having a diameter of 0.3 to 1.3 mm is constituted.
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