KR20230161132A - Manufacturing method of recyclable polyethylene film - Google Patents
Manufacturing method of recyclable polyethylene film Download PDFInfo
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- KR20230161132A KR20230161132A KR1020220060766A KR20220060766A KR20230161132A KR 20230161132 A KR20230161132 A KR 20230161132A KR 1020220060766 A KR1020220060766 A KR 1020220060766A KR 20220060766 A KR20220060766 A KR 20220060766A KR 20230161132 A KR20230161132 A KR 20230161132A
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- density polyethylene
- polyethylene
- polyethylene film
- recyclable
- printing
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- -1 polyethylene Polymers 0.000 title claims abstract description 50
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 46
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 17
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 13
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 13
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 12
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 12
- 238000003475 lamination Methods 0.000 abstract description 8
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 239000000758 substrate Substances 0.000 abstract 6
- 230000000694 effects Effects 0.000 description 11
- 239000000049 pigment Substances 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 229920002554 vinyl polymer Polymers 0.000 description 5
- 239000001023 inorganic pigment Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 229920006163 vinyl copolymer Polymers 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MFEVGQHCNVXMER-UHFFFAOYSA-L 1,3,2$l^{2}-dioxaplumbetan-4-one Chemical compound [Pb+2].[O-]C([O-])=O MFEVGQHCNVXMER-UHFFFAOYSA-L 0.000 description 1
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 description 1
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical compound [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 1
- 239000005750 Copper hydroxide Substances 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 229910000003 Lead carbonate Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- CUGMJFZCCDSABL-UHFFFAOYSA-N arsenic(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[As+3].[As+3] CUGMJFZCCDSABL-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- PVEOYINWKBTPIZ-UHFFFAOYSA-N but-3-enoic acid Chemical compound OC(=O)CC=C PVEOYINWKBTPIZ-UHFFFAOYSA-N 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000006103 coloring component Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229940116318 copper carbonate Drugs 0.000 description 1
- 229910001956 copper hydroxide Inorganic materials 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- GEZOTWYUIKXWOA-UHFFFAOYSA-L copper;carbonate Chemical compound [Cu+2].[O-]C([O-])=O GEZOTWYUIKXWOA-UHFFFAOYSA-L 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920006262 high density polyethylene film Polymers 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- QXKXDIKCIPXUPL-UHFFFAOYSA-N sulfanylidenemercury Chemical compound [Hg]=S QXKXDIKCIPXUPL-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/14—Printing or colouring
- B32B38/145—Printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B2037/148—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers whereby layers material is selected in order to facilitate recycling of the laminate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
- B32B2309/105—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/043—HDPE, i.e. high density polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/046—LDPE, i.e. low density polyethylene
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
본 발명은 재활용이 가능한 폴리에틸렌 필름의 제조방법에 관한 것으로, 더욱 상세하게는 폴리에틸렌 단일재질로 이루어져 재활용이 가능할 뿐만 아니라, 표면장력이 향상되어 인쇄성능이 우수하며, 합지과정을 위한 별도의 경화시간이나 접착제를 필요로 하지 않기 때문에 우수한 생산성을 나타내는 재활용이 가능한 폴리에틸렌 필름의 제조방법에 관한 것이다.The present invention relates to a method of manufacturing a recyclable polyethylene film. More specifically, it is made of a single polyethylene material and is not only recyclable, but also has excellent printing performance due to improved surface tension and does not require a separate curing time for the lamination process. It relates to a method of manufacturing a recyclable polyethylene film that exhibits excellent productivity because it does not require adhesives.
폴리에틸렌(polyethylene)은 반투명 내지 투명, 가연성 왁스상 고체로 매우 좋은 열가소성을 갖고, 물, 산, 알칼리 및 용제 등에 잘 견디며, 전기절연성, 내수성, 방습성 및 내한성이 우수하고, 가공성도 좋은 특징이 있다.Polyethylene is a translucent to transparent, flammable waxy solid that has very good thermoplasticity, is resistant to water, acids, alkalis, and solvents, has excellent electrical insulation, water resistance, moisture resistance, and cold resistance, and has good processability.
그러나, 폴리에틸렌은 가소성으로서 열팽창 계수가 커, 온도에 민감한데, 폴리에틸렌으로 이루어진 필름은 이 같은 물성의 한계로 인해 지속적인 열에 견디는 내열온도가 80 내지 90℃이며, 일반 IR(infrared) 경화 잉크의 완전 건조조건인 약 150℃의 온도에서 40분 정도를 견디지 못하고 휨이 발생하거나 수축 등이 일어나는 등 변형이 발생하여 상품성이 저하되어 대량으로 신속하게 생산하기 위한 산업용 소재로서의 사용이 어렵다.However, polyethylene is plastic and has a high coefficient of thermal expansion, making it sensitive to temperature. Due to these limitations in physical properties, films made of polyethylene have a heat resistance temperature of 80 to 90°C that can withstand continuous heat, and can be used for complete drying of general IR (infrared) curing ink. It cannot withstand the temperature of about 150℃ for about 40 minutes, and deformation such as bending or shrinkage occurs, which reduces its marketability and makes it difficult to use as an industrial material for rapid mass production.
종래에는 이러한 물성을 보완하기 위해 폴리에틸렌을 이용한 필름을 제조하는 과정에서 저밀도 폴리에틸렌에 폴리에틸렌테레프탈레이트나 나이론 등을 적층하여 내열성이나 기계적 물성을 개선하는 방법이 이용되었다. 또한 일반적으로 저밀도 폴리에틸렌 필름은 인쇄성이 좋지 않기 때문에 폴리에틸렌 테레프탈레이트나 나일론에 인쇄를 하고, 인쇄층의 상부면에 저밀도 폴리에틸렌을 적층하여 인쇄성이 우수하면서도 스크레치 방지효과를 나타내도록 제조되고 있다.Conventionally, in order to complement these physical properties, a method of improving heat resistance or mechanical properties was used by laminating polyethylene terephthalate or nylon on low-density polyethylene in the process of manufacturing films using polyethylene. In addition, since low-density polyethylene films generally have poor printability, they are printed on polyethylene terephthalate or nylon, and low-density polyethylene is laminated on the upper surface of the print layer to provide excellent printability and an anti-scratch effect.
그러나, 상기와 같이 이종성분으로 이루어진 다층필름은 재활용이 거의 불가능하기 때문에, 폐기처분 되거나 물리적인 분쇄 등의 과정을 통해 일부가 자재로 활용되고 있을 뿐, 근본적인 재활용은 이루어지지 못하는 문제점이 있었다.However, since the multilayer film composed of heterogeneous components as described above is almost impossible to recycle, some of it is disposed of or used as a material through a process such as physical crushing, but there is a problem in that fundamental recycling cannot be achieved.
또한, 이종성분으로 이루어진 필름 간에 합지를 위해 각 필름을 제조하고 별도의 경화시간을 거치거나 합지를 위한 접착제를 사용해야하기 때문에 생산성이 저하되는 문제점이 있었다.In addition, there was a problem of decreased productivity because each film had to be manufactured and underwent a separate curing time or an adhesive for lamination had to be used for lamination between films composed of heterogeneous components.
본 발명의 목적은 폴리에틸렌 단일재질로 이루어져 재활용이 가능할 뿐만 아니라, 표면장력이 향상되어 인쇄성능이 우수하며, 합지과정을 위한 별도의 경화시간이나 접착제를 필요로 하지 않기 때문에 우수한 생산성을 나타내는 재활용이 가능한 폴리에틸렌 필름의 제조방법을 제공하는 것이다.The purpose of the present invention is to not only enable recycling by making polyethylene as a single material, but also to improve printing performance due to improved surface tension, and to enable recycling with excellent productivity because it does not require separate curing time or adhesive for the lamination process. To provide a method for manufacturing polyethylene film.
본 발명의 목적은 중밀도 폴리에틸렌으로 이루어진 기재층, 상기 기재층의 일면에 고밀도 폴리에틸렌으로 이루어진 인쇄층 및 상기 기재층의 타면에 저밀도 폴리에틸렌으로 이루어진 실링층이 형성되도록 T-다이가 구비된 공압출기로 중밀도 폴리에틸렌, 고밀도 폴리에틸렌 및 저밀도 폴리에틸렌을 공압출하여 이루어지는 것을 특징으로 하는 재활용이 가능한 폴리에틸렌 필름의 제조방법을 제공함에 의해 달성된다.The object of the present invention is to use a co-extruder equipped with a T-die to form a base layer made of medium-density polyethylene, a printed layer made of high-density polyethylene on one side of the base layer, and a sealing layer made of low-density polyethylene on the other side of the base layer. This is achieved by providing a method for producing a recyclable polyethylene film, which is made by coextruding medium density polyethylene, high density polyethylene, and low density polyethylene.
본 발명의 바람직한 특징에 따르면, 상기 기재층은 25 내지 100 마이크로미터의 두께로 형성되는 것으로 한다.According to a preferred feature of the present invention, the base layer is formed to have a thickness of 25 to 100 micrometers.
본 발명의 더 바람직한 특징에 따르면, 상기 인쇄층은 12.5 내지 50 마이크로미터의 두께로 형성되는 것으로 한다.According to a more preferred feature of the present invention, the printed layer is formed to have a thickness of 12.5 to 50 micrometers.
본 발명의 더욱 바람직한 특징에 따르면, 상기 실링층은 12.5 내지 50 마이크로미터의 두께로 형성되는 것으로 한다.According to a more preferred feature of the present invention, the sealing layer is formed to have a thickness of 12.5 to 50 micrometers.
본 발명의 더욱 더 바람직한 특징에 따르면, 상기 재활용이 가능한 폴리에틸렌 필름의 제조방법으로 제조되는 폴리에틸렌 필름은 표면장력이 42 내지 50인 것으로 한다.According to an even more preferred feature of the present invention, the polyethylene film produced by the method for producing a recyclable polyethylene film has a surface tension of 42 to 50.
본 발명에 따른 재활용이 가능한 폴리에틸렌 필름의 제조방법은 폴리에틸렌 단일재질로 이루어져 재활용이 가능할 뿐만 아니라, 표면장력이 향상되어 인쇄성능이 우수하며, 합지과정을 위한 별도의 경화시간이나 접착제를 필요로 하지 않기 때문에 우수한 생산성을 나타내는 재활용이 가능한 폴리에틸렌 필름을 제공하는 탁월한 효과를 나타낸다.The method of manufacturing a recyclable polyethylene film according to the present invention is made of a single polyethylene material, which not only enables recycling, but also improves surface tension, improves printing performance, and does not require separate curing time or adhesive for the lamination process. Therefore, it has an excellent effect of providing a recyclable polyethylene film that exhibits excellent productivity.
도 1은 본 발명에 따른 재활용이 가능한 폴리에틸렌 필름의 제조방법으로 제조되는 폴리에틸렌 필름을 나타낸 사시도이다.Figure 1 is a perspective view showing a polyethylene film manufactured by the method for manufacturing a recyclable polyethylene film according to the present invention.
이하에는, 본 발명의 바람직한 실시예와 각 성분의 물성을 상세하게 설명하되, 이는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 상세하게 설명하기 위한 것이지, 이로 인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는다.Below, preferred embodiments of the present invention and the physical properties of each component are described in detail, but are intended to be described in detail so that those skilled in the art can easily practice the invention. This does not mean that the technical idea and scope of the present invention are limited.
본 발명에 따른 재활용이 가능한 폴리에틸렌 필름의 제조방법은 중밀도 폴리에틸렌으로 이루어진 기재층(10), 상기 기재층(10)의 일면에 고밀도 폴리에틸렌으로 이루어진 인쇄층(20) 및 상기 기재층(10)의 타면에 저밀도 폴리에틸렌으로 이루어진 실링층(30)이 형성되도록 T-다이가 구비된 공압출기로 중밀도 폴리에틸렌, 고밀도 폴리에틸렌 및 저밀도 폴리에틸렌을 공압출하여 이루어진다.The method of manufacturing a recyclable polyethylene film according to the present invention includes a base layer 10 made of medium-density polyethylene, a printing layer 20 made of high-density polyethylene on one side of the base layer 10, and the base layer 10. It is made by co-extruding medium-density polyethylene, high-density polyethylene, and low-density polyethylene using a co-extruder equipped with a T-die so that a sealing layer 30 made of low-density polyethylene is formed on the other side.
상기 T-다이가 구비된 공압출기로 공압출되는 기재층(10)은 본 발명을 통해 제조되는 재활용이 가능한 폴리에틸렌 필름(1)의 기재가 되는 층으로, 25 내지 100 마이크로미터 두께의 중밀도 폴리에틸렌(MDPE, Medium Density Poly Ethylene)으로 이루어지는 것이 바람직한데, 폴리에틸렌 필름이 외력에 의해 쉽게 변형되거나 찢어지지 않도록 기계적 물성을 개선하는 역할을 한다.The base layer 10 co-extruded by the co-extruder equipped with the T-die is a base layer of the recyclable polyethylene film 1 manufactured through the present invention, and is made of medium density polyethylene with a thickness of 25 to 100 micrometers. It is preferably made of (MDPE, Medium Density Poly Ethylene), which serves to improve mechanical properties so that the polyethylene film is not easily deformed or torn by external force.
상기 기재층(10)의 두께가 25 마이크로미터 미만이면 기재층(10)의 두께가 지나치가 얇아 상기와 같은 기계적 물성 개선효과가 미미하며, 상기 기재층(10)의 두께가 100 마이크로미터를 초과하게 되면 본 발명을 통해 제조되는 재활용이 가능한 폴리에틸렌 필름(1)의 두께가 지나치게 증가하여 투명성, 유연성 및 탄성과 같은 물성이 저하될 수 있기 때문에 포장지나 비닐봉투로 적용하기에 바람직하지 못하다.If the thickness of the base layer 10 is less than 25 micrometers, the thickness of the base layer 10 is too thin and the effect of improving mechanical properties as described above is minimal, and if the thickness of the base layer 10 exceeds 100 micrometers, the effect of improving mechanical properties as described above is minimal. If this is done, the thickness of the recyclable polyethylene film (1) manufactured through the present invention may increase excessively and physical properties such as transparency, flexibility, and elasticity may be reduced, making it undesirable for application as packaging paper or plastic bags.
또한, 상기 T-다이가 구비된 공압출기로 공압출되는 인쇄층(20)은 상기 기재층(10)의 일면에 형성되며, 고밀도 폴리에틸렌(HDPE, Hihg Density Poly Ethylene)으로 이루어지는데, 상기 기재층(10)의 일면에 형성되되, 12.5 내지 50 마이크로미터의 두께인 고밀도 폴리에틸렌으로 이루어지는 것이 바람직하다. 상기의 성분 및 두께로 형성되는 인쇄층(20)은 표면장력 지수가 42 이상을 나타내어 우수한 인쇄성능을 나타낸다.In addition, the printing layer 20, which is co-extruded by the co-extruder equipped with the T-die, is formed on one side of the base layer 10 and is made of high density polyethylene (HDPE). It is formed on one side of (10), and is preferably made of high-density polyethylene with a thickness of 12.5 to 50 micrometers. The printing layer 20 formed with the above ingredients and thickness has a surface tension index of 42 or more, showing excellent printing performance.
일반적으로, 중밀도 폴리에틸렌이나 저밀도 폴리에틸렌은 인쇄잉크에 대해 인쇄성능이 낮기 때문에, 기존에 포장지나 비닐봉투의 경우 폴리에틸렌테레프탈레이트 또는 나일론과 같이 인쇄성이 좋은 수지에 인쇄를 진행하고, 인쇄면의 상부에 폴리에틸렌 필름을 적층하는 과정이 이루어지는데, 이러한 경우 이종성분으로 이루어진 필름을 합지하기 위해 필름 제조후에 각 필름별로 24 내지 72시간 동안 경화를 진행해야하며, 재활용이 불가능한 문제점이 발생하기 된다.In general, medium-density polyethylene or low-density polyethylene has low printing performance with respect to printing ink, so in the case of existing packaging paper or plastic bags, printing is performed on a resin with good printability such as polyethylene terephthalate or nylon, and the upper part of the printing surface is used. The process of laminating a polyethylene film is carried out. In this case, in order to laminate films made of heterogeneous components, each film must be cured for 24 to 72 hours after manufacturing, causing the problem that recycling is impossible.
그러나, 본 발명을 통해 제조되는 폴리에틸렌 필름은 인쇄성이 우수한 고밀도 폴리에틸렌으로 이루어진 인쇄층(20)이 적용되어, 인쇄층(20)에 직접 인쇄가 가능하기 때문에 이종성분간의 합지나 경화과정 및 접착제의 사용을 생략할 수 있기 때문에 우수한 생산성을 나타낼 수 있다.However, the polyethylene film manufactured through the present invention has a printing layer 20 made of high-density polyethylene with excellent printability, and can be printed directly on the printing layer 20, so it is possible to print directly on the printing layer 20. Because its use can be omitted, excellent productivity can be achieved.
이때, 상기 인쇄층(20)에 적용되는 인쇄잉크는 인쇄층의 상부면에 0.1 내지 10 마이크로미터의 두께로 인쇄될 수 있는데, 인쇄잉크의 인쇄두께가 0.1 마이크로미터 미만이면 인쇄잉크의 색상이나 기계적 강도가 저하되어 시인성과 내충격성이 낮아질 수 있으며, 상기 인쇄잉크의 두께가 10 마이크로미터를 초과하게 되면 인쇄잉크의 두께가 지나치게 증가되는 것으로, 상기의 효과는 크게 향상되지 않으면서 제조비용을 증가시키게 된다.At this time, the printing ink applied to the printing layer 20 may be printed at a thickness of 0.1 to 10 micrometers on the upper surface of the printing layer. If the printing thickness of the printing ink is less than 0.1 micrometer, the color or mechanical effect of the printing ink may be different. Visibility and impact resistance may decrease due to reduced strength, and if the thickness of the printing ink exceeds 10 micrometers, the thickness of the printing ink is excessively increased, increasing manufacturing costs without significantly improving the above effects. do.
이때, 상기 인쇄잉크의 성분은 고밀도 폴리에틸렌 필름에 적용되어 우수한 인쇄성능을 나타낼 수 있는 것으면, 특별히 한정되지 않고, 어떠한 것이든 사용가능하나 용매 100 중량부, 안료 30 내지 35 중량부 및 비닐계 공중합체 바인더 40 내지 50 중량부로 이루어진 것을 사용하는 것이 바람직하다.At this time, the components of the printing ink are not particularly limited, as long as they can exhibit excellent printing performance when applied to high-density polyethylene film, and any one can be used, but it contains 100 parts by weight of solvent, 30 to 35 parts by weight of pigment, and vinyl-based aerosol. It is preferable to use 40 to 50 parts by weight of a polymer binder.
상기 용매는 상기 안료 및 비닐계 공중합체 바인더가 고르게 혼합될 수 있는 역할을 하는데, 에틸아세테이트 및 메틸에틸케톤으로 이루어지며, 에틸아세테이트 및 메틸에틸케톤이 1:1의 중량부로 혼합되어 이루어지는 것이 바람직하다.The solvent serves to evenly mix the pigment and the vinyl-based copolymer binder, and is composed of ethyl acetate and methyl ethyl ketone. It is preferable that ethyl acetate and methyl ethyl ketone are mixed in a ratio of 1:1 by weight. .
또한, 상기 안료는 30 내지 35 중량부가 함유되며, 인쇄잉크에 다양한 색상을 부여하는 역할을 하는데, 무기계 안료와 유기계 안료 모두가 사용가능하나, 상기 용매에 녹지않는 무기계 안료를 사용하는 것이 바람직하다. 상기 무기계 안료는 발색 성분이 무기물인 안료로, 은폐력이 크고 내열 및 내광성이 좋아 자외선 등에 노출되어도 손상이 억제되는 인쇄잉크를 제공하는 효과를 나타낸다.In addition, the pigment is contained in an amount of 30 to 35 parts by weight and serves to impart various colors to the printing ink. Both inorganic pigments and organic pigments can be used, but it is preferable to use an inorganic pigment that is insoluble in the solvent. The inorganic pigment is a pigment in which the coloring component is an inorganic material, and has great hiding power and good heat resistance and light resistance, so it has the effect of providing a printing ink that prevents damage even when exposed to ultraviolet rays.
상기 안료의 함량이 30 중량부 미만이면, 인쇄잉크의 색상 선명도가 저하되며, 상기 안료의 함량이 35 중량부를 초과하게 되면 상대적으로 용매나 비닐계 공중합체 바인더의 함량이 줄어들어 인쇄잉크의 균질성과 접착성이 저하될 수 있다.If the pigment content is less than 30 parts by weight, the color clarity of the printing ink deteriorates, and if the pigment content exceeds 35 parts by weight, the content of the solvent or vinyl copolymer binder is relatively reduced, thereby improving the homogeneity and adhesion of the printing ink. Performance may decrease.
이때, 상기 무기계 안료로는 이산화티탄, 황화수은, 황산구리, 탄산구리, 수산화구리, 황화비소, 산화납, 탄산납 및 산화아연으로 이루어진 그룹에서 선택된 하나 이상이 사용될 수 있다.At this time, the inorganic pigment may be one or more selected from the group consisting of titanium dioxide, mercury sulfide, copper sulfate, copper carbonate, copper hydroxide, arsenic sulfide, lead oxide, lead carbonate, and zinc oxide.
또한, 상기 비닐계 공중합체 바인더는 40 내지 50 중량부가 함유되며, 상기 안료성분을 결속시키며, 인쇄잉크에 접착성을 부여하는 역할을 하는데, 상기 비닐계 공중합체 바인더의 함량이 40 중량부 미만이면 인쇄잉크의 접착성이 저하되어 상기 인쇄층으로부터 박리되는 현상이 발생할 수 있으며, 상기 비닐계 공중합체 바인더의 함량이 50 중량부를 초과하게 되면 인쇄잉크의 점성이 지나치게 증가하여 상기 인쇄층에 인쇄되는 과정의 효율성이 저하될 수 있다.In addition, the vinyl copolymer binder contains 40 to 50 parts by weight and serves to bind the pigment component and provide adhesiveness to the printing ink. If the content of the vinyl copolymer binder is less than 40 parts by weight, The adhesion of the printing ink may decrease and peeling from the printing layer may occur, and if the content of the vinyl-based copolymer binder exceeds 50 parts by weight, the viscosity of the printing ink increases excessively, causing a process of printing on the printing layer. efficiency may decrease.
이때, 상기 비닐계 공중합체 바인더는 비닐아세트산, 비닐알코올 및 비닐염화물의 공중합체로 이루어지는 것이 바람직한데, 상기와 같은 성분으로 이루어지는 비닐계 공중합체 바인더는 에틸렌비닐아세테이트 또는 폴리우레탄 수지와 우수한 혼합성을 나타내는 수산기 유형으로 상기 안료와 우수한 혼합성을 나타내어 접착성이 우수하면서도 균일한 물성의 인쇄인크를 제공하는 역할을 한다.At this time, the vinyl-based copolymer binder is preferably made of a copolymer of vinyl acetic acid, vinyl alcohol, and vinyl chloride. The vinyl-based copolymer binder made of the above components has excellent miscibility with ethylene vinyl acetate or polyurethane resin. Due to the hydroxyl group type, it exhibits excellent miscibility with the pigment and serves to provide a printing ink with excellent adhesion and uniform physical properties.
상기 인쇄층(20)의 두께가 12.5 마이크로미터 미만이면 상기의 효과가 미미하며, 상기 인쇄층(20)의 두께가 50 마이크로미터를 초과하게 되면 상기의 효과는 크게 향상되지 않으면서 제품의 두께가 지나치게 증가할 뿐만 아니라 투명도가 급격하게 저하되어 내용물을 육안으로 확인해야하는 업종의 포장지로서 적용하는 경우의 상품성이 낮아지게 된다.If the thickness of the printed layer 20 is less than 12.5 micrometers, the above effect is minimal, and if the thickness of the printed layer 20 exceeds 50 micrometers, the above effect is not significantly improved and the thickness of the product decreases. Not only does it increase excessively, but its transparency drastically decreases, lowering its marketability when applied as packaging paper in industries where the contents must be confirmed with the naked eye.
또한, 상기 T-다이가 구비된 공압출기로 공압출되는 실링층(30)은 상기 기재층(10)의 타면에 형성되며 저밀도 폴리에틸렌(LDPE, Low Density Poly Ethylene)으로 이루어지는데, 상기 기재층(10)의 타면에 형성되되, 12.5 내지 50 마이크로미터의 두께를 나타내는 저밀도 폴리에틸렌으로 이루어지는 것이 바람직하다.In addition, the sealing layer 30, which is co-extruded by a co-extruder equipped with the T-die, is formed on the other side of the base layer 10 and is made of low density polyethylene (LDPE), the base layer ( It is formed on the other side of 10), and is preferably made of low-density polyethylene with a thickness of 12.5 to 50 micrometers.
상기의 성분 및 두께로 이루어진 실링층(30)이 형성되면, 본 발명을 통해 제조되는 폴리에틸렌 필름의 기밀성과 유연성이 향상되는데, 상기 실링층(30)의 두께가 12.5 마이크로미터 미만이면 상기의 효과가 미미하며, 상기 실링층(30)의 두께가 50 마이크로미터를 초과하게 되면 상기의 효과는 크게 향상되지 않으면서 제품의 두께를 지나치게 증가시키기 때문에 바람직하지 못하다.When the sealing layer 30 composed of the above components and thickness is formed, the airtightness and flexibility of the polyethylene film manufactured through the present invention are improved. If the thickness of the sealing layer 30 is less than 12.5 micrometers, the above effect is achieved. It is insignificant, and if the thickness of the sealing layer 30 exceeds 50 micrometers, it is undesirable because the above effect is not significantly improved and the thickness of the product is excessively increased.
이때, 상기의 실링층(30)은 본 발명을 통해 제조된 필름을 제품에 적용하는 경우 제품과 맞닿는 포장재 내측에 위치하는 것이 바람직하다.At this time, when applying the film manufactured through the present invention to a product, the sealing layer 30 is preferably located inside the packaging material in contact with the product.
따라서, 본 발명을 통해 제조되는 재활용이 가능한 폴리에틸렌 필름(1)은 상기와 같이 기재층(10), 인쇄층(20) 및 실링층(30)이 형성될 수 있도록 T-다이가 구비된 공압출기를 이용하여 기재층(10), 인쇄층(20) 및 실링층(30)을 구성하는 수지 성분을 동시에 압출 및 적층하는 과정으로 제조되기 때문에, 별도의 경화나 합지공정을 필요로 하지 않고 접착제가 사용되지 않아 우수한 생산성을 나타낸다.Therefore, the recyclable polyethylene film (1) manufactured through the present invention is manufactured using a co-extruder equipped with a T-die so that the base layer (10), the printing layer (20), and the sealing layer (30) can be formed as described above. Since it is manufactured through a process of simultaneously extruding and laminating the resin components that make up the base layer 10, the printing layer 20, and the sealing layer 30, the adhesive does not require a separate curing or lamination process. Since it is not used, it shows excellent productivity.
이하에서는, 본 발명에 따른 재활용이 가능한 폴리에틸렌 필름의 제조방법 및 그 제조방법으로 제조된 폴리에틸렌 필름의 물성을 실시예를 들어 설명하기로 한다.Hereinafter, the manufacturing method of a recyclable polyethylene film according to the present invention and the physical properties of the polyethylene film manufactured by the manufacturing method will be described using examples.
<실시예 1><Example 1>
T-다이(die)가 구비된 공압출기를 이용하여 공압출을 진행하되, 60 마이크로미터 두께의 폴리에틸렌 수지로 이루어진 기재층, 상기 기재층의 상부면에 25 마이크로미터의 두께의 고밀도 폴리에틸렌 수지로 이루어진 인쇄층 및 상기 기재층의 하부면에 25 마이크로미터 두께의 저밀도 폴리에틸렌 수지로 이루어진 실링층이 형성되도록 공압출을 진행하여 재활용이 가능한 폴리에틸렌 필름을 제조하였다.Co-extrusion is performed using a co-extruder equipped with a T-die, and a base layer made of polyethylene resin with a thickness of 60 micrometers is formed, and the upper surface of the base layer is made of high-density polyethylene resin with a thickness of 25 micrometers. A recyclable polyethylene film was manufactured by co-extruding to form a sealing layer made of low-density polyethylene resin with a thickness of 25 micrometers on the lower surface of the printing layer and the base layer.
<비교예 1><Comparative Example 1>
110 마이크로미터 두께의 선형저밀도 폴리에틸렌 필름.110 micrometer thick linear low-density polyethylene film.
상기 실시예 1 및 비교예 1의 필름의 표면장력 지수를 측정하여 아래 표 1에 나타내었다.The surface tension indices of the films of Example 1 and Comparative Example 1 were measured and shown in Table 1 below.
{단, 표면장력지수는 실시예 1을 통해 제조된 폴리에틸렌 필름의 인쇄층의 면을 기준으로 하였으며, Kruss사의 표면장력 측정기를 이용하여 측정하였다.}{However, the surface tension index was based on the surface of the printed layer of the polyethylene film prepared in Example 1 and was measured using a surface tension meter from Kruss.}
<표 1><Table 1>
상기 표 1에 나타낸 것처럼, 본 발명의 실시예 1을 통해 제조된 폴리에틸렌 필름은 표면장력이 높아 우수한 인쇄성을 나타내는 것을 알 수 있다.As shown in Table 1, it can be seen that the polyethylene film prepared through Example 1 of the present invention has high surface tension and exhibits excellent printability.
따라서, 본 발명에 따른 재활용이 가능한 폴리에틸렌 필름의 제조방법은 단일재질로 이루어져 재활용이 가능할 뿐만 아니라, 표면장력이 향상되어 인쇄성능이 우수하며, 합지과정을 위한 별도의 경화시간을 필요로 하지 않기 때문에 우수한 생산성을 나타내는 폴리에틸렌 필름을 제공한다.Therefore, the method of manufacturing a recyclable polyethylene film according to the present invention not only enables recycling by making it from a single material, but also improves surface tension, improves printing performance, and does not require separate curing time for the lamination process. A polyethylene film exhibiting excellent productivity is provided.
1 ; 재활용이 가능한 폴리에틸렌 필름
10 ; 기재층
20 ; 인쇄층
30 ; 실링층One ; Recyclable polyethylene film
10 ; base layer
20 ; printing layer
30 ; Sealing layer
Claims (5)
A co-extruder equipped with a T-die is used to form a base layer made of medium-density polyethylene, a printed layer made of high-density polyethylene on one side of the base layer, and a sealing layer made of low-density polyethylene on the other side of the base layer. A method for producing a recyclable polyethylene film, characterized in that it is made by co-extruding polyethylene and low-density polyethylene.
상기 기재층은 25 내지 100 마이크로미터의 두께로 형성되는 것을 특징으로 하는 재활용이 가능한 폴리에틸렌 필름의 제조방법.
In claim 1,
A method of producing a recyclable polyethylene film, wherein the base layer is formed to a thickness of 25 to 100 micrometers.
상기 인쇄층은 12.5 내지 50 마이크로미터의 두께로 형성되는 것을 특징으로 하는 재활용이 가능한 폴리에틸렌 필름의 제조방법.
In claim 1,
A method of manufacturing a recyclable polyethylene film, wherein the printed layer is formed to a thickness of 12.5 to 50 micrometers.
상기 실링층은 12.5 내지 50 마이크로미터의 두께로 형성되는 것을 특징으로 하는 재활용이 가능한 폴리에틸렌 필름의 제조방법.
In claim 1,
A method of manufacturing a recyclable polyethylene film, wherein the sealing layer is formed to a thickness of 12.5 to 50 micrometers.
상기 재활용이 가능한 폴리에틸렌 필름의 제조방법으로 제조되는 폴리에틸렌 필름은 표면장력이 42 내지 50인 것을 특징으로 하는 재활용이 가능한 폴리에틸렌 필름의 제조방법.
The method of any one of claims 1 to 4,
A method for producing a recyclable polyethylene film, characterized in that the polyethylene film produced by the method for producing a recyclable polyethylene film has a surface tension of 42 to 50.
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| KR101657486B1 (en) | 2009-01-09 | 2016-09-19 | 데이진 아라미드 비.브이. | Polyethylene film with high tensile strength and high tensile energy to break |
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| KR101657486B1 (en) | 2009-01-09 | 2016-09-19 | 데이진 아라미드 비.브이. | Polyethylene film with high tensile strength and high tensile energy to break |
| KR101132924B1 (en) | 2009-12-09 | 2012-04-06 | 호남석유화학 주식회사 | Polyethylene resin compositions for waterbag film |
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