WO2020209613A1 - 유연성과 연신율이 높은 시트를 인쇄하는 방법 - Google Patents
유연성과 연신율이 높은 시트를 인쇄하는 방법 Download PDFInfo
- Publication number
- WO2020209613A1 WO2020209613A1 PCT/KR2020/004779 KR2020004779W WO2020209613A1 WO 2020209613 A1 WO2020209613 A1 WO 2020209613A1 KR 2020004779 W KR2020004779 W KR 2020004779W WO 2020209613 A1 WO2020209613 A1 WO 2020209613A1
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- WIPO (PCT)
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- sheet
- adhesive layer
- printed
- base sheet
- silicone adhesive
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0018—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using ink-fixing material, e.g. mordant, precipitating agent, after printing, e.g. by ink-jet printing, coating or spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
Definitions
- the present invention relates to a method of automatically printing a sheet to be printed, which is difficult to automate a print job due to high flexibility and elongation, and more particularly, a state in which the sheet to be printed is fixed to a base sheet that fixes the sheet to be printed in an unfolded state
- the present invention relates to a printing method that can be easily and neatly separated when separating a printing sheet from a base sheet after printing, while being surely maintained, and preventing the printed ink from eluting.
- the elongation rate is significantly lower than that of the fabric or nonwoven fabric, so that the fabric or nonwoven fabric is printed on a base sheet having a large property to maintain an unfolded state.
- a method of separating the print sheet from the base sheet after printing is performed while the sheet is adhered is known.
- the printing target sheet does not adhere well to the base sheet, so that the print job cannot be performed smoothly.
- the print sheet was separated from the base sheet, it was adhered to the base sheet. A phenomenon in which the adhesive layer is transferred to the printing sheet occurs.
- the print sheet may not be separated well and the print sheet may be pulled severely, and the print sheet may be damaged. A phenomenon in which the adhesive layer is transferred to the printing sheet also occurs.
- printing sheets such as cloth or non-woven fabric are mainly used for contacting human skin, and there is a problem that cosmetic ingredients such as emulsions elute ink printed on the printing sheet.
- the main component of the adhesive layer is made of silicone so that it is harmless to human skin, and a method to minimize the elution of ink to organic solvents by using UV ink and UV curing is devised. Has been.
- the present invention has been conceived to solve the above-described problem, and an object of the present invention is to provide a printing method that is easy to separate a print sheet from a base sheet after printing while being well fixed to a base sheet to a printing target sheet.
- An object of the present invention is to provide a printing method that reliably prevents a phenomenon in which an adhesive layer is transferred to a printing sheet.
- An object of the present invention is to provide a printing method in which printing ink is not eluted in an organic solvent and is firmly fixed to a printing sheet.
- An object of the present invention is to provide a method for printing a sheet to be printed in which a manufacturing process is simple and manufacturing equipment is not enlarged.
- the present invention provides a printing method that undergoes the following steps.
- a base sheet 10 having a first elongation is prepared.
- a silicone adhesive layer 30 is formed on the base sheet 10.
- Step 3 includes.
- the second step 2-1, P.E. It may further include an operation of winding the base sheet 10 on which the coating layer 15 is formed on the first roll 71.
- the base sheet 10 on which the coating layer 15 is formed is unwound from the first roll 71, and the first tensioner roller 72 is applied to the unwound base sheet 10, and the P.E.
- the operation of applying the silicone adhesive layer 30 on the coating layer 15 with the silicone coating device 73 may be further included.
- the base sheet 10 on which the silicon adhesive layer 30 is stacked is wound around the first tensioner roller 72 and the second tensioner roller 75 to apply tension,
- a silicon drying device 74 provided between the 1 tensioner roller 72 and the second tensioner roller 75 and in which a predetermined temperature atmosphere is created, and the base sheet 10 on which the silicone adhesive layer 30 is stacked is It may further include an operation of passing through for a period of time and drying.
- a sheet to be printed 50 having a second elongation higher than the first elongation is laminated on the formed silicone adhesive layer 30.
- UV ink is printed on the sheet 50 to be printed and UV-dried with a UV curing machine to form a UV ink cured layer 6.
- the fourth step may further include a step 4-1 of forming the coating layer 62 by transferring the coating solution to the surface of the cured UV ink curing layer 6 and drying it with UV curing again.
- a printing sheet 57 is formed by forming a cutting portion 53 on the sheet 50 to be printed in a predetermined shape.
- a cutting depth is given to the upper part of the silicon adhesive layer 30 by penetrating the sheet to be printed 50 from the top to reduce the cutting part 53 Can be formed.
- a portion of the printing sheet 57 defined by the cutting portion 53 in the printing target sheet 50 is removed from the silicone adhesive layer 30.
- the adhesive layer is reliably fixed to the base sheet so that the impregnation layer is not separated from the base sheet, and the phenomenon that the adhesive layer is transferred to the printing sheet is reliably prevented.
- the adhesive force of the adhesive layer exposed to the outside is very low, so that the printing sheet can be easily separated, and the surface of the adhesive layer forms a very smooth surface such as a mirror surface, so that the sheet to be printed is well fixed to the base sheet.
- the operation of separating the print sheet from the base sheet is very easy due to the cutting depth of the cutting portion made in the laminated sheet.
- the manufacturing process is simple and the manufacturing equipment is not enlarged.
- the printing ink since the printing ink does not elute into the organic solvent and is reliably fixed to the printing sheet, quality sensibility can be greatly improved.
- FIG. 1 is a perspective view showing a state in which a print sheet printed by a printing method according to the present invention is adhered on a base sheet.
- FIG. 2 is a side sectional view showing a base sheet.
- FIG. 3 shows P.E. It is a side cross-sectional view showing the coated base sheet.
- FIG. 4 shows P.E. It is a side cross-sectional view showing a base sheet having a silicone adhesive layer formed on the coating.
- FIG. 5 is a side cross-sectional view showing a base sheet in which a sheet to be printed is laminated on a silicone adhesive layer.
- FIG. 6 is a schematic diagram of an apparatus for laminating a sheet to be printed on a base sheet.
- FIG. 7 is a side cross-sectional view showing a state in which UV ink is transferred onto a sheet to be printed and UV cured and dried.
- FIG. 8 is a side cross-sectional view showing a state in which the coating layer is transferred onto the UV ink cured layer and UV cured and dried.
- FIG. 9 is a side sectional view showing a state in which a printed sheet is formed by cutting a printed sheet to be printed.
- FIG. 10 is a side cross-sectional view showing a state in which the printing sheet of FIG. 9 is separated from a base sheet.
- the print target sheet 50 printed by a printing method according to the present invention is printed while being laminated on a base sheet 10 having a silicone adhesive layer 30 formed thereon. After printing, a cutting portion 53 is formed on the sheet 50 to be printed so that only the print sheet 57 can be separated from the base sheet 10.
- the printing method for this is as follows.
- a base sheet 10 having a first elongation is prepared.
- the base sheet 10 may be a sheet having a low first elongation to sufficiently maintain its shape even when an external force is applied in the unfolded state.
- the base sheet 10 may be a sheet that can be wound on a roller or the like due to its low elongation but high flexibility. Sheets with low elongation but high flexibility are very easy to automate printing and cutting.
- the base sheet 10 may be paper or PET film.
- Paper used as the base sheet 10 is produced by thinly pressing the pulp, and is flat when viewed with the naked eye, but has a very uneven and irregular surface when viewed from a fine point of view. Since the PET film is a wide stretch of molten PET resin, the polymers of PET have a uniaxial or biaxially stretched surface. That is, the PET film also has a rough surface from a fine point of view.
- the present invention is applied to the base sheet 10 by P.E. It is proposed a method of coating and handling it in a state wound around the first roll 71. Handling of the first roll 71 in a wound state is also closely related to an automated facility for laminating a sheet to be printed and a silicone adhesive layer coating to be described later.
- the base sheet 10 wound around the first roll 71 is unscrewed by the first tensioner roller 72.
- the first tensioner roller 72 releases the base sheet 10 of the first roll 71 with a considerable tension.
- the surface of the first tensioner roller 72 is the bottom surface of the base sheet 10, that is, P.E. It contacts the opposite side (back side) of the coated side and transfers the base sheet 10 in a tense state. P.E. of the base sheet 10 by the first tensioner roller 72.
- the coating layer 15 is stretched in a fairly taut state.
- the base sheet of part A of FIG. 6 is as shown in FIG. 3.
- a silicone adhesive layer 30 is applied on the surface of the coating layer 15 by a silicone coating device 73.
- the silicone pressure-sensitive adhesive has very high tack in the molten state.
- the silicone coating device 73 uses the P.E. It is applied to the surface of the coating layer 15.
- the silicone adhesive includes P.E.
- Ingredient additives are added in small amounts.
- the melted high-temperature silicone adhesive is P.E.
- P.E. When applied to the coating layer 15, P.E.
- the surface of the coating layer 15 is also slightly melted.
- the P.E. melted in the silicone adhesive.
- Ingredient additives are P.E.
- the polymer is connected by reacting with the molten surface of the coating layer 15. Therefore, P.E. At the interface between the coating layer 15 and the silicone adhesive layer 30, the two layers 15 and 30 are strongly bonded.
- P.E. instead of adding some ingredients, P.E. If some silicone components are added to the coating layer 15, P.E. The base sheet 10 coated with the coating layer 15 cannot be wound and handled. Then, after the P.E coating layer 15 is formed, the base sheet 10 has to be handled in an unfolded state, which causes the manufacturing equipment to become enlarged.
- the base sheet 10 can be wound and handled until the silicone pressure-sensitive adhesive is applied on the P.E coating layer 15 of the base sheet 10.
- the silicone adhesive layer 30 of the base sheet 10 is applied with a silicone drying device 74 between the first tensioner roller 72 and the second tensioner roller 75.
- a silicone drying device 74 between the first tensioner roller 72 and the second tensioner roller 75.
- the base sheet 10 transferred by the first tensioner roller 72 maintains a tensioned state while being wound around the second tensioner roller 75.
- the surface of the second tensioner roller 75 contacts the bottom surface of the base sheet 10, that is, the opposite surface (rear surface) of the surface on which the silicone adhesive layer 30 is formed, and transfers the base sheet 10 in a tense state.
- the silicone adhesive layer 30 of the base sheet 10 passes through the silicone drying device 74 in a stretched state in a tightly tensioned state.
- a predetermined temperature atmosphere is created inside the silicone drying device 74, and the base sheet 10 to which the silicone adhesive layer 30 is applied passes through the silicone drying device 74 for a predetermined time.
- the silicon adhesive layer 30 in the molten state applied to the base sheet 10 passing through the silicon drying device 74 is completely dried and solidified.
- the base sheet of part B of FIG. 6 is as shown in FIG. 4.
- the adhesion of the dried silicone adhesive layer 30 surface is significantly lower than that of the melted silicone adhesive.
- the silicone pressure-sensitive adhesive was melted and P.E. Since it is applied to the coating layer 15, P.E.
- the coating layer 15 and the silicone adhesive layer 30 are quite strongly bonded.
- P.E. The silicone adhesive to which the component was added is melted and P.E. Since it is applied to the coating layer 15, the bonding force is further increased.
- the surface of the silicone adhesive layer 30 dried after being stacked on the coating layer 15 has lower adhesiveness.
- the mirrored P.E. When the silicone adhesive is applied in a molten state on the coating layer 15 and then dried, the silicone adhesive layer 30 also has a very smooth surface. Therefore, based on the overall area of the surface of the silicone adhesive layer 30, the adhesive strength of the silicone adhesive layer 30 fixes the sheet to be printed 50, which will be described later, and the sheet to be printed 50 remains flat. Enough to do.
- the printing target sheet 50 is laminated on the silicone adhesive layer 30 of the base sheet 10 as shown in FIG. 5.
- the printing target sheet 50 may be a fabric without a force to be stretched, such as cloth, nonwoven fabric, cloth, tie back, nylon cloth, cotton, or TC.
- the print target sheet 50 may be a material having a second elongation higher than that of the base sheet 10.
- the print target sheet 50 may be provided in a state wound around the second roll 76. Then, the sheet 50 to be printed is released, which is wound on the second roll 76, and laminated on the silicone adhesive layer 30 of the base sheet 10 wound around the second tensioner roller 75. I can.
- the second roll 76 is a speed corresponding to the feed rate of the base sheet 10 conveyed by the second tensioner roller 75 It can be driven to rotate.
- the sheet to be printed 50 has an anisotropic elongation
- the sheet to be printed 50 can be wound on the second roll 76 in a direction having a low elongation.
- the printing target sheet 50 and the base sheet 10 are separated by a pressing roller 77 that presses the surface of the printing target sheet 50 (the surface to be printed) toward the silicone adhesive layer 30. Can be laminated.
- the sheet 50 to be printed is a material such as a non-woven fabric or cloth, and the sheet of such a material has a non-smooth surface.
- the silicone adhesive layer 30 has a very smooth surface, the sheet to be printed 50 can be sufficiently adhesively fixed.
- the printing sheet 57 which is a part of the printing target sheet 50, is separated from the silicone adhesive layer 30, the adhesiveness of the silicone adhesive layer 30 is low, so the back surface of the printing sheet 57 (silicon adhesive layer The printing sheet 57 can be easily separated without damaging the side facing the side).
- the laminated print target sheet 50 and the base sheet 10 may be wound around the third roll 78. Since the sheet 50 to be printed having a high elongation rate is laminated with the base sheet 10 having a low elongation rate, the operation of winding the sheets 10 and 50 laminated on the third roll 78 is easily performed.
- the base sheet of part C of FIG. 6 is as shown in FIG. 5.
- the laminating equipment according to the embodiment of the present invention shown in FIG. 6 has the following advantages.
- the material of the base sheet 10 and the material of the sheet 50 to be printed may be changed.
- the shape or color to be printed can also be changed.
- the base sheet 10 is supplied in the form of a first roll 71, and the print target sheet 50 is also independently supplied in the form of a second roll 76, and these (10, 50) After this is laminated, it is collected in the form of a third roll 78. Therefore, even if the material of the base sheet 10, the material of the sheet 50 to be printed, and the shape/color to be printed are changed, the laminating equipment can be used as it is.
- the UV ink is printed on the sheet 50 to be printed and UV-dried with a UV curing machine to form the UV ink cured layer 6.
- This printing operation may be performed by unwinding the sheet to be printed (in a state of being laminated with the base sheet) wound around the third roll 78.
- the UV ink cured layer 6 is suitable for preventing the ink from eluting again. However, simply forming the UV ink cured layer 6 does not guarantee preventing the UV ink curing layer 6 from eluting into the organic solvent component. For example, when the printing target sheet 50 is used as a mask pack, the UV ink cured layer 6 may be flowed and used in a state immersed in an emulsion or the like.
- the coating layer 62 is formed by transferring the coating solution to the surface of the UV ink cured layer 6 cured as above, as shown in FIG. It may further include the step of.
- the printing sheet 57 is formed by forming a cutting part 53 on the printing target sheet 50 in a predetermined shape.
- the print sheet 57 may be a part in which printing is performed on the sheet to be printed 50 and may be used as an actual product.
- the printing sheet 57 may include both a printed portion and an unprinted portion.
- the cutting part 53 may be formed in a closed loop shape surrounding a portion of the printing sheet 57.
- the cutting part 53 When forming the cutting part 53, as shown in FIG. 9, the cutting part 53 is given a cutting depth from the top to the upper part of the silicon adhesive layer 30 through the sheet 50 to be printed. Can be formed.
- the form of the cutting operation is not limited. That is, various cutting methods such as a wooden knife, a corrosion knife, and a magnetic knife can be used.
- the cutting depth may be made up to a portion of the upper portion of the silicone adhesive layer 30.
- the coating layer 15 functions as a barrier to prevent the applied silicone adhesive from permeating to the base sheet 10, and prevents the cutting part 53 from invading the base sheet 10, and It functions to prevent the sheet 10 from peeling off.
- the upper portion of the silicone adhesive layer 30 is opened, so that the edge of the printing sheet 57 can be easily grasped. Also, P.E. Since the coating layer 15 prevents the peeling phenomenon of the base sheet 10, even if the upper part of the silicone adhesive layer 30 is cut, the base sheet 10 is peeled together in the process of removing the printing sheet 57 Can be prevented.
- the silicone adhesive layer 30 is the P.E. While it is very strongly bonded to the coating layer 15, it is adhered to the printing sheet 57 with weak adhesion, so it is easy to remove the printing sheet 57, as well as the back side of the printing sheet 57 (silicone adhesive layer There is no phenomenon in which the surface facing the side) is damaged or the silicone adhesive layer 30 is transferred to the printing sheet 57.
- the laminated base sheet 10 is wound on a roll and handled again, or cut at predetermined intervals to be handled in the form of a sheet as shown in FIG. I can.
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Abstract
Description
Claims (7)
- 제1연신율을 가지는 바탕 시트(10)를 준비하는 제1단계;제1단계 후 상기 바탕 시트(10)의 표면에 P.E. 코팅을 하여 P.E. 코팅층(15)을 형성하는 제2-1단계;제2-1단계 후, P.E. 성분을 첨가한 액상의 실리콘 점착제를 상기 P.E. 코팅층(15) 위에 도포하여 실리콘 점착층(30)을 적층하는 제2-2단계; 및제2-2단계 후, 적층된 실리콘 점착층(30)을 소정의 온도 분위기에서 소정의 시간 동안 완전 건조하여 고체상으로 만드는 제2-3단계;를 포함하는,바탕 시트(10) 상에 실리콘 점착층(30)을 형성하는 제2단계;제2단계 후, 형성된 상기 실리콘 점착층(30) 상에 상기 제1연신율보다 높은 제2연신율을 가지는 인쇄 대상 시트(50)를 합지하는 제3단계;제3단계 후, 인쇄 대상 시트(50) 상에 UV 잉크를 인쇄하고 UV 경화기로 UV 건조시켜 UV잉크 경화층(6)을 형성하는 제4단계; 및제4단계 후, 소정의 형상으로 인쇄 대상 시트(50)에 커팅부(53)를 형성하여 인쇄시트(57)를 형성하는 제5단계;를 포함하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
- 청구항 1에 있어서,상기 제2-1단계는, P.E. 코팅층(15)이 형성된 바탕 시트(10)를 제1롤(71)에 권취하는 작업을 더 포함하고,상기 제2-2단계는, P.E. 코팅층(15)이 형성된 바탕 시트(10)를 상기 제1롤(71)에서 풀고, 풀어진 바탕 시트(10)에 제1텐셔너 롤러(72)로 장력을 가한 상태에서 P.E. 코팅층(15) 상에 실리콘 코팅 장치(73)로 실리콘 점착층(30)을 도포하는 작업을 더 포함하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
- 청구항 2에 있어서,상기 제2-3단계는, 상기 실리콘 점착층(30)이 적층된 바탕 시트(10)를 상기 제1텐셔너 롤러(72) 및 제2텐셔너 롤러(75)에 감아 장력을 가한 상태에서, 상기 제1텐셔너 롤러(72) 및 제2텐셔너 롤러(75) 사이에 구비되고 소정의 온도 분위기가 조성된 실리콘 건조 장치(74)로 상기 실리콘 점착층(30)이 적층된 바탕 시트(10)를 소정의 시간 동안 통과시키며 건조시키는 작업을 더 포함하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
- 청구항 3에 있어서,상기 제3단계는,제2롤(76)에 권취되어 있는 상기 인쇄 대상 시트(50)를 풀어, 상기 제2텐셔너 롤러(75)에 감겨 있는 상기 바탕 시트(10)의 실리콘 점착층(30) 상에 합지하되, 상기 인쇄 대상 시트(50)의 표면을 상기 실리콘 점착층(30) 쪽으로 가압하는 가압롤러(77)로 합지하고, 합지된 인쇄 대상 시트(50)와 바탕 시트(10)를 제3롤(78)에 권취하는 작업을 더 포함하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
- 청구항 1에 있어서,제4단계 후 제5단계 전, 경화된 UV잉크 경화층(6) 표면에 코팅액을 전사시키고 재차 UV 경화기로 UV 건조시켜 코팅층(62)을 형성하는 제4-1단계;를 더 포함하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
- 청구항 1에 있어서,상기 제5단계에서, 상기 커팅부(53)를 형성할 때, 상부로부터 상기 인쇄 대상 시트(50)를 관통하여 상기 실리콘 점착층(30)의 상부 일부분까지 커팅 깊이를 주어 커팅부(53)를 형성하는 것을 특징으로 하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
- 청구항 1에 있어서,제5단계 후, 상기 인쇄 대상 시트(50)에서 상기 커팅부(53)에 의해 규정되는 인쇄시트(57) 부분을 상기 실리콘 점착층(30)으로부터 떼어내는 제6단계;를 더 포함하는,유연성과 연신율이 높은 시트를 인쇄하는 방법.
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KR1020190041048A KR102056566B1 (ko) | 2019-04-08 | 2019-04-08 | 유연성과 연신율이 높은 시트를 인쇄하는 방법 |
KR10-2019-0041048 | 2019-04-08 |
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KR102056566B1 (ko) * | 2019-04-08 | 2019-12-16 | 고창석 | 유연성과 연신율이 높은 시트를 인쇄하는 방법 |
KR102118163B1 (ko) * | 2020-01-16 | 2020-06-02 | 고경열 | 보안 및 정품 라벨 제조 방법 |
Citations (5)
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JPH1199574A (ja) * | 1997-09-29 | 1999-04-13 | Kindaisha:Kk | ラベル原反並びにラベル及びそれらの製造方法 |
JP2005224985A (ja) * | 2004-02-10 | 2005-08-25 | Kobayashi Kirokushi Co Ltd | ラベル用紙とその加工方法 |
KR101268035B1 (ko) * | 2012-11-08 | 2013-06-04 | 임경민 | 라벨 및 스티커용 원단 생산 장치 |
JP2015223809A (ja) * | 2014-05-29 | 2015-12-14 | セイコーインスツル株式会社 | 粘着ラベルの製造方法 |
KR102056566B1 (ko) * | 2019-04-08 | 2019-12-16 | 고창석 | 유연성과 연신율이 높은 시트를 인쇄하는 방법 |
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2019
- 2019-04-08 KR KR1020190041048A patent/KR102056566B1/ko active IP Right Grant
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2020
- 2020-04-08 WO PCT/KR2020/004779 patent/WO2020209613A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH1199574A (ja) * | 1997-09-29 | 1999-04-13 | Kindaisha:Kk | ラベル原反並びにラベル及びそれらの製造方法 |
JP2005224985A (ja) * | 2004-02-10 | 2005-08-25 | Kobayashi Kirokushi Co Ltd | ラベル用紙とその加工方法 |
KR101268035B1 (ko) * | 2012-11-08 | 2013-06-04 | 임경민 | 라벨 및 스티커용 원단 생산 장치 |
JP2015223809A (ja) * | 2014-05-29 | 2015-12-14 | セイコーインスツル株式会社 | 粘着ラベルの製造方法 |
KR102056566B1 (ko) * | 2019-04-08 | 2019-12-16 | 고창석 | 유연성과 연신율이 높은 시트를 인쇄하는 방법 |
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