KR20200122043A - Pla cigarette filter and method for the same - Google Patents

Pla cigarette filter and method for the same Download PDF

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Publication number
KR20200122043A
KR20200122043A KR1020190044815A KR20190044815A KR20200122043A KR 20200122043 A KR20200122043 A KR 20200122043A KR 1020190044815 A KR1020190044815 A KR 1020190044815A KR 20190044815 A KR20190044815 A KR 20190044815A KR 20200122043 A KR20200122043 A KR 20200122043A
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nonwoven fabric
biodegradable pla
filter
pla
spunbonding
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KR1020190044815A
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Korean (ko)
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이광용
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에콜그린텍(주)
이광용
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Publication of KR20200122043A publication Critical patent/KR20200122043A/en

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0275—Manufacture of tobacco smoke filters for filters with special features
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • A24D3/0208—Cutting filter materials
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0229—Filter rod forming processes
    • A24D3/0245—Filter rod forming processes by winding, e.g. spirally
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/062—Use of materials for tobacco smoke filters characterised by structural features
    • A24D3/063—Use of materials for tobacco smoke filters characterised by structural features of the fibers
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/067—Use of materials for tobacco smoke filters characterised by functional properties
    • A24D3/068—Biodegradable or disintegrable

Abstract

The present invention relates to a cigarette filter manufacturing method. More particularly, the present invention relates to a cigarette filter product and a cigarette filter manufacturing method using a biodegradable PLA spunbond nonwoven fabric. The present invention is manufactured by means of the biodegradable PLA spunbond nonwoven fabric, and thus it is possible to replace cellulose acetate, which takes a very long time to degrade naturally. The method of the present invention includes: a step of producing an amorphous biodegradable PLA spunbond nonwoven fabric by means of a pressing roll in which an embossing roll has a temperature of 140°C to 150°C and the other roll has a temperature of 50°C to 60°C; a step of cutting the fabric to have a weight of 20 g/m^2 to 60 g/m^2; a step of forming a columnar filter by twisting the cut fabric by the number of rotations set to one or two or more layers; and a step of surface-crystallizing the columnar filter by passing the same through a hole provided with a heating device having a heating temperature of 80°C to 130°C.

Description

생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법 및 그 제품{PLA CIGARETTE FILTER AND METHOD FOR THE SAME}Tobacco filter manufacturing method using biodegradable PLA spun-bonding nonwoven fabric and its products {PLA CIGARETTE FILTER AND METHOD FOR THE SAME}

본 발명은 담배필터 제조방법에 관한 것으로, 더욱 상세하게는 생분해성 PLA 스판본딩 부직포를 이용하여 제조함으로써 자연 분해되는데 매우 오래 걸리던 기존의 셀룰로스 아세테이트를 대체할 수 있는 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법 및 그 제품에 관한 것이다.The present invention relates to a tobacco filter manufacturing method, and more particularly, a cigarette using a biodegradable PLA spunbonding nonwoven fabric that can replace the existing cellulose acetate that took a very long time to naturally decompose by manufacturing using a biodegradable PLA spunbonding nonwoven fabric It relates to a filter manufacturing method and product thereof.

버려지는 플라스틱이 미세한 마이크로 플라스틱이 되어 강이나 바다로 흘러 바다를 오염시키고 있다. 그 중 가장 큰 영향을 끼치는 것이 담배꽁초이며, 해변에서 수집된 쓰레기 전체의 절반 이상을 차지하고, 세계 해양에서 인위적인 오염 물질 1위로 담배꽁초가 꼽힐 정도이다.The discarded plastic becomes fine microplastic and flows into rivers and seas, polluting the sea. Cigarette butts are the most influential among them, accounting for more than half of the total garbage collected on the beach, and cigarette butts as the number one artificial pollutant in the world's oceans.

담배필터에 사용되는 셀룰로스 아세테이트(Cellulose Acetate)는 자연계에서 분해하는데 최소 10년 이상의 시간이 소요된다. 이와 같이 환경적으로 문제되는 담배필터는 국내는 물론 해외에서도 규정이 강화되고 있어 이를 대체할 수 있는 생분해성 소재의 필터 대체가 시급한 실정이다.Cellulose Acetate, which is used in tobacco filters, takes at least 10 years to decompose in nature. As such environmentally problematic tobacco filters are being reinforced in domestic as well as overseas, it is urgent to replace filters with biodegradable materials that can replace them.

물론, 종이나 나무섬유, 해조류 섬유 소재의 필터가 개발되어 사용되고 있으나 소재 특성상 성형이 어렵고 셀룰로스 아세테이트 대비 여과 능력이 많이 부족한 단점으로 지적되고 있다.Of course, a filter made of paper, wood fiber, or seaweed fiber has been developed and used, but it is pointed out as a disadvantage of having difficulty in molding due to the nature of the material and lack of filtration ability compared to cellulose acetate.

그리고 PLA 소재를 이용하여 담배필터를 제조하여 사용되는 것이 있는데, 주름된 필름사를 접어 사용한다. 하지만, 이와 같이 접혀진 PLA 소재의 담배필터는 펼쳐지려는 복원력 때문에 제조가 매우 어렵고 내부에 홀을 형성할 수 없는 단점이 있다.In addition, there is one used by manufacturing a cigarette filter using PLA material, which is used by folding the wrinkled film yarn. However, the folded PLA material cigarette filter is very difficult to manufacture due to its resilience to unfold, and has a disadvantage in that it cannot form a hole inside.

등록특허공보 제10-0460598호(2004.11.30)Registered Patent Publication No. 10-0460598 (2004.11.30) 등록특허공보 제10-1346061호(2013.12.23)Registered Patent Publication No. 10-1346061 (2013.12.23)

이에, 본 발명은 종래와 같은 문제점을 해결하기 위해 창안한 것으로, 인체 및 환경에 해롭지 않은 식물유래 PLA(Poly Lactic Acid) 소재를 활용하여 필터를 제조함으로써 자연 분해되는데 많은 시간이 소요되는 셀룰로스 아세테이트를 대체하면서 제조시 기둥 형태를 유지하여 제조가 용이한 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법을 제공하는데 그 목적이 있다.Accordingly, the present invention was invented to solve the problems as in the prior art, and by manufacturing a filter using a plant-derived PLA (Poly Lactic Acid) material that is not harmful to the human body and the environment, cellulose acetate, which takes a lot of time to naturally decompose, is used. Its purpose is to provide a tobacco filter manufacturing method using a biodegradable PLA spunbonding nonwoven fabric that is easy to manufacture by maintaining a column shape during manufacture while replacing it.

상기 목적을 달성하기 위한 본 발명에 따른 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법은,A tobacco filter manufacturing method using a biodegradable PLA spunbonding nonwoven fabric according to the present invention for achieving the above object,

엠보싱 롤은 140℃ ~ 150℃, 나머지 롤은 50℃ ~ 60℃로 이루어진 압착롤을 이용하여 비결정성 생분해성 PLA 스판본딩 부직포를 생산하는 단계;Producing an amorphous biodegradable PLA spunbonding nonwoven fabric using a pressing roll consisting of an embossing roll of 140° C. to 150° C., and the remaining rolls of 50° C. to 60° C.;

생분해성 PLA 스판본딩 부직포의 중량이 20g/㎡ ~ 60g/㎡가 되도록 재단하는 단계;Cutting so that the weight of the biodegradable PLA spunbonding nonwoven fabric is 20g/m2 ~ 60g/m2;

재단된 생분해성 PLA 스판본딩 부직포를 한 겹 또는 두 겹 이상으로 설정된 회전수만큼 꼬아 기둥 형태의 필터를 성형하는 단계; 및Forming a column-shaped filter by twisting the cut biodegradable PLA spunbonding nonwoven fabric by a set number of rotations in one or two or more layers; And

기둥 형태의 필터를 히팅온도 80℃ ~ 130℃의 히팅장치가 구비된 홀을 통과시켜 표면 결정화시키는 단계; 를 포함함을 특징으로 한다.Crystallizing the surface by passing a column-shaped filter through a hole provided with a heating device having a heating temperature of 80°C to 130°C; It characterized in that it includes.

본 발명에 따른 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법은 인체 및 환경에 해롭지 않은 식물유래 PLA 소재를 활용함으로써 온도 60℃, 습도 80%에 미생물 하에서 6개월 동안 90% 이상 분해되므로 일회용 규제에 따라 셀룰로스 아세테이트를 대체하여 자연환경을 보존할 수 있으며, 특히 제조 과정에서 표면 결정화 공정을 통해 재단하더라도 기둥 형상을 유지함으로써 담배 제조가 매우 용이하며 생산성이 향상되는 효과가 있다.The tobacco filter manufacturing method using the biodegradable PLA spunbonding nonwoven fabric according to the present invention uses plant-derived PLA material that is not harmful to the human body and the environment, so it is decomposed by more than 90% for 6 months under microorganisms at a temperature of 60°C and humidity of 80%. As a result, it is possible to preserve the natural environment by replacing cellulose acetate. In particular, even if it is cut through a surface crystallization process in the manufacturing process, the column shape is maintained, so that cigarette manufacturing is very easy and productivity is improved.

또한, 꼬아져 형성됨에 따라 유해물질이 이동하는 경로는 직선형태가 아닌 곡선형태이므로 기존 제품 동일한 길이 대비 유해물질을 흡수할 수 있는 구간이 길어져 여과 기능이 향상되는 효과가 있다.In addition, since the path through which the harmful substances travel is formed by twisting is not a straight line, but a curved shape, the section that can absorb harmful substances is longer compared to the same length of the existing product, thereby improving the filtering function.

도 1은 본 발명에 따른 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조 과정을 도시한 공정도.1 is a flow chart showing a tobacco filter manufacturing process using a biodegradable PLA spunbonding nonwoven fabric according to the present invention.

이하, 본 발명에 따른 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법의 바람직한 실시 예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of a method of manufacturing a tobacco filter using a biodegradable PLA spunbonding nonwoven fabric according to the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조 과정을 도시한 공정도이다.1 is a flow chart showing a tobacco filter manufacturing process using a biodegradable PLA spunbonding nonwoven fabric according to the present invention.

도면에 도시된 바와 같이 본 발명에 따른 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법은, 압착롤을 이용하여 비결정성 생분해성 PLA 스판본딩 부직포를 생산하는 단계; 재단하는 단계; 꼬아서 기둥 형태의 필터를 성형하는 단계; 표면 결정화하는 단계; 를 포함한다.As shown in the drawings, a tobacco filter manufacturing method using a biodegradable PLA spunbonding nonwoven fabric according to the present invention includes the steps of producing an amorphous biodegradable PLA spunbonding nonwoven fabric using a pressing roll; Cutting; Twisting to form a column-shaped filter; Surface crystallization; Includes.

[비결정성 생분해성 PLA 스판본딩 부직포 생산 단계][Amorphous biodegradable PLA spunbonding nonwoven fabric production stage]

압착롤을 통해 생분해성 PLA 스판본딩 부직포를 생산하는 단계로서, 한 쌍의 압착롤을 이용하여 비결정성 생분해성 PLA 스판본딩 부직포를 생산하는 단계이다. 이때, 압출기 스크류 온도는 230℃ ~ 250℃로 하고, 다이스 온도는 220℃ ~ 230℃로 한다. 그리고 상기 압착롤 중 엠보싱 롤은 140℃ ~ 150℃로 설정하고, 나머지 롤은 50℃ ~ 60℃로 설정하여 엠보싱이 된 부분은 섬유의 결합력을 강화시킬 수 있도록 한다.This is a step of producing a biodegradable PLA spunbonding nonwoven fabric through a pressing roll, and is a step of producing an amorphous biodegradable PLA spunbonding nonwoven fabric using a pair of pressing rolls. At this time, the extruder screw temperature is set to 230 ℃ ~ 250 ℃, the die temperature is 220 ℃ ~ 230 ℃. In addition, among the pressing rolls, the embossing roll is set at 140°C to 150°C, and the remaining rolls are set at 50°C to 60°C so that the embossed portion can reinforce the bonding force of the fibers.

여기서 엠보싱롤의 온도가 140℃ 이하가 되면 결합력이 약화될 수 있고, 150℃ 이상이면 PLA 소재가 용융되어 문제가 될 수 있으며, 나머지 롤은 50℃ ~ 60℃로 하여 비결정화가 되도록 한다.Here, if the temperature of the embossing roll is below 140℃, the bonding force may be weakened. If the temperature of the embossing roll is higher than 150℃, the PLA material may melt and cause a problem. The remaining rolls are set at 50℃ to 60℃ so that they become amorphous.

이때, 60℃ 이상이면 결정화 특성이 상승되어 꼬는 작업 시 브리틀(brittle) 한 특성으로 인해 작업이 어렵고, 꼬임 상태가 원활하지 않게 된다.At this time, when the temperature is higher than 60°C, the crystallization property is increased, and the work is difficult due to the brittle property during the twisting operation, and the twisting state is not smooth.

[생분해성 PLA 스판본딩 부직포 재단 단계][Biodegradable PLA spunbonding nonwoven fabric cutting step]

생분해성 PLA 스판본딩 부직포 재단 단계는 끈의 굵기에 따라 일정한 폭으로 롤 재단하는 단계이다. 즉, 생분해성 PLA 스판본딩 부직포의 중량이 20g/㎡ ~ 60g/㎡가 되도록하고, 끈의 굵기에 따라 폭 5㎜ ~ 100㎜로 재단하여 사용한다. The step of cutting biodegradable PLA spunbonding nonwoven fabric is a step of cutting a roll with a certain width according to the thickness of the string. That is, the weight of the biodegradable PLA spunbonding nonwoven fabric should be 20g/㎡ ~ 60g/㎡, and cut into 5mm ~ 100mm width depending on the thickness of the string.

이때, 부직포 중량이 20g/㎡ 이하이면 여러 겹을 겹쳐서 사용해야 하는 불편함이 있고, 50g/㎡ 이상이면 PLA 특성상 브리틀한 특성으로 꼬는 작업이 어렵다.At this time, if the weight of the nonwoven fabric is less than 20g/m2, it is inconvenient to use multiple layers, and if it is more than 50g/m2, twisting is difficult due to the brittle nature of PLA.

[생분해성 PLA 스판본딩 부직포를 꼬아 필터 성형 단계][Filter forming step by twisting biodegradable PLA spunbonding nonwoven fabric]

이 단계는 재단된 생분해성 PLA 스판본딩 부직포를 한 겹 또는 두 겹 이상으로 설정된 회전수만큼 꼬아 기둥 형태의 필터를 성형하는 단계이다. 이때, 재봉사보다 단단하고 강하게 꼬면 중앙에 홀이 없는 기둥 형태로 형성되고, 약하게 꼬면 중앙에 홀이 있는 기둥 형태로 형성된다. This step is a step of forming a column-shaped filter by twisting the cut biodegradable PLA spunbonding nonwoven fabric by a set number of rotations in one or two or more layers. At this time, if it is twisted harder and stronger than the sewing thread, it is formed in a pillar shape without a hole in the center, and if twisted weakly, it is formed in a pillar shape with a hole in the center.

중앙에 홀이 없는 필터는 6~10회 꼬아 형성하고, 중앙에 홀이 있는 필터는 2~5회 꼬아 형성한다. Filters with no holes in the center are twisted 6 to 10 times, and filters with holes in the center are twisted 2 to 5 times.

[필터 표면 결정화하는 단계][Step of crystallizing the filter surface]

성형 단계에 의해 기둥 형태로 꼬아진 필터는 히팅온도 80℃ ~ 130℃의 히팅장치가 구비된 홀을 통과시켜 표면 결정화함으로써 꼬아진 필터가 풀리는 것을 방지하며 담배필터의 제조를 완료한다. 여기서 홀의 지름은 3㎜ ~ 10㎜이고, 길이는 5㎜ ~ 20㎜로 하되, 회전속도와 생산량 등에 따라 홀의 지름과 길이는 다양하게 할 수 있다.The filter twisted in a column shape by the shaping step passes through a hole equipped with a heating device having a heating temperature of 80°C to 130°C to crystallize the surface, thereby preventing the twisted filter from unraveling and completing the manufacture of the cigarette filter. Here, the diameter of the hole is 3mm ~ 10mm, and the length is 5mm ~ 20mm, but the diameter and length of the hole can be varied depending on the rotational speed and production volume.

이때, 히팅장치의 온도가 80℃ 이하이면 표면 결정화가 약하여 컷팅 후 꼬임이 풀리거나 생산성이 저하될 수 있고 130℃ 이상이면 내부까지 결정화되어 필터가 끊어질 수 있다. At this time, if the temperature of the heating device is 80° C. or less, the surface crystallization is weak, and twisting may be loosened after cutting or productivity may decrease. If the temperature is 130° C. or more, the filter may be cut off due to crystallization to the inside.

필터의 제조가 완료되면 원하는 길이로 재단하여 보관한다. 이때, 필터의 표면이 결정화됨으로써 재단하더라도 꼬인 상태가 풀리지 않아 담배를 만드는 과정에서 취급 및 작업성이 용이하여 신속하게 권지를 말아 담배를 제조할 수 있다.When the filter is manufactured, cut it to the desired length and store it. At this time, since the surface of the filter is crystallized, the twisted state is not released even if cut, so handling and workability in the process of making a cigarette are easy, so that a cigarette can be quickly rolled up.

이와 같은 공정에 의해 제조된 담배필터는 인체 및 환경에 해롭지 않은 식물유래 PLA 소재가 활용됨으로써 온도 60℃, 습도 80%에 미생물 하에서 6개월 동안 90% 이상 분해되므로 일회용 규제에 따라 셀룰로스 아세테이트를 대체하여 자연환경을 보존할 수 있으며, 특히 제조 과정에서 표면 결정화 공정을 통해 재단하더라도 기둥 형상을 유지함으로써 담배 제조가 매우 용이하며 생산성이 향상된다.The tobacco filter manufactured by such a process uses plant-derived PLA material that is not harmful to the human body and the environment, so it is decomposed more than 90% for 6 months under microorganisms at a temperature of 60°C and humidity of 80%. The natural environment can be preserved. In particular, even if it is cut through the surface crystallization process during the manufacturing process, the column shape is maintained, so that the manufacture of cigarettes is very easy and productivity is improved.

또한, 꼬아져 형성됨에 따라 유해물질이 이동하는 경로는 직선형태가 아닌 곡선형태이므로 기존 제품 동일한 길이 대비 유해물질을 흡수할 수 있는 구간이 길어져 여과 기능이 향상된다.In addition, since the path through which harmful substances are moved by being twisted is not a straight line, but a curved shape, the filtration function is improved because the section that can absorb harmful substances is longer compared to the same length of the existing product.

Claims (2)

엠보싱 롤은 140℃ ~ 150℃, 나머지 롤은 50℃ ~ 60℃로 이루어진 압착롤을 이용하여 비결정성 생분해성 PLA 스판본딩 부직포를 생산하는 단계;
생분해성 PLA 스판본딩 부직포의 중량이 20g/㎡ ~ 60g/㎡가 되도록 재단하는 단계;
재단된 생분해성 PLA 스판본딩 부직포를 한 겹 또는 두 겹 이상으로 설정된 회전수만큼 꼬아 기둥 형태의 필터를 성형하는 단계;
기둥 형태로 꼬아진 필터를 히팅온도 80℃ ~ 130℃의 히팅장치가 구비된 홀을 통과시켜 표면 결정화시키는 단계; 및
재단하는 단계: 를 포함함을 특징으로 하는 생분해성 PLA 스판본딩 부직포를 이용한 담배필터 제조방법.
Producing an amorphous biodegradable PLA spunbonding nonwoven fabric using a pressing roll consisting of an embossing roll of 140° C. to 150° C., and the remaining rolls of 50° C. to 60° C.;
Cutting so that the weight of the biodegradable PLA spunbonding nonwoven fabric is 20g/m2 ~ 60g/m2;
Forming a pillar-shaped filter by twisting the cut biodegradable PLA spunbonding nonwoven fabric by a set number of rotations in one or two or more layers;
Crystallizing the surface of a filter twisted in a column shape by passing through a hole provided with a heating device having a heating temperature of 80°C to 130°C; And
Cutting step: Tobacco filter manufacturing method using a biodegradable PLA spunbonding nonwoven fabric comprising a.
 제1 항의 방법으로 제조된 생분해성 PLA 스판본딩 부직포를 이용한 담배필터.Tobacco filter using a biodegradable PLA spunbonding nonwoven fabric manufactured by the method of claim 1.
KR1020190044815A 2019-04-17 2019-04-17 Pla cigarette filter and method for the same KR20200122043A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102339567B1 (en) * 2021-03-02 2021-12-16 에콜그린텍(주) Pla sediment filter and the manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100460598B1 (en) 1999-03-11 2004-12-08 니뽄 다바코 산교 가부시키가이샤 Biodegradable cellulose acetate constructions and tobacco filter
KR101346061B1 (en) 2012-03-14 2013-12-31 김유강 Manufacturing device of string handle for the shopping bag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100460598B1 (en) 1999-03-11 2004-12-08 니뽄 다바코 산교 가부시키가이샤 Biodegradable cellulose acetate constructions and tobacco filter
KR101346061B1 (en) 2012-03-14 2013-12-31 김유강 Manufacturing device of string handle for the shopping bag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102339567B1 (en) * 2021-03-02 2021-12-16 에콜그린텍(주) Pla sediment filter and the manufacturing method thereof

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