• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    METHOD OF REMOVING PRINTED INK ON PLASTIC FILMS. The present invention relates to a method of removing ink printed on a plastic film that comprises various physical-chemical treatments. The main steps of the method are: conditioning the material, polishing, removing paint from the film, washing the film, recovering the cleaning solution, recovering the pigment and drying the film. As a result of the method, it is possible to obtain, on the one hand, an ink-free plastic film and, on the other hand, the pigment. These products can be reused at Industrie, in order to improve the product's value chain.
    公开号:BR112014023871B1
    申请号:R112014023871-5
    申请日:2013-03-13
    公开日:2020-11-24
    发明作者:Andres Fullana Font；Augustin Lozano Morcillo
    申请人:Universidad De Alicante；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention relates to an innovative method of removing printed ink on a plastic film whose nature may vary. Some examples of plastic films that can be used in the described method are polyethylene (PE), polypropylene (PP), polyester film (PET) and polyamide (PA). TECHNICAL STATUS
    [002] The printing process on a flexible packaging consists of the application of liquid ink on a plastic film. The solvent used (usually organic compounds or water), which is volatilized, is then removed by means of a drying process. The desired design is printed on the film after evaporation and is ready for use as packaging for various products. It is common to adjust the parameters of the printing machine and to adjust the different colors used during the aforementioned printing, in order to obtain quality printing that has no imperfections. Most residues are generated during this stage. The plastic film circulates through the printer at speeds that can reach up to 500 meters per minute when adjusting the machine. Large amounts of plastic film that do not have the quality necessary for use in final packaging applications are generated due to this speed.
    [003] Some of the supports most widely used in this process are polyethylene, polypropylene or polyester films etc. Due to the adjustment described above, the printing industries have a large amount of losses that can reach up to 5-10% of their total packaging film production. The printed material that can be recycled with the method proposed in the present comes essentially from the aforementioned losses and from the material used through commitments in its final application.
    [004] Currently, this material is recovered for recycling through processes in which the printed ink is not removed. In this way a low quality black or brownish film is obtained, so that its nail is significantly lower than the nail of initial ink-free films. It is normally used, therefore, for the preparation of garbage bags or applications with low visual quality.
    [005] Some patents related to different variants of the same concept can be found: Recording media regeneration device: US 5,621,939 A. Printing media recycling process, plastic film printing and installation to put into practice the mentioned process - EP 1,419,829 A1. Process for separating printing ink from composite materials - CA2101181.
    [006] The invention US 5,621,939 A relates to the treatment of removing ink from a printed paper, so that the starting material is different. In addition, in this method, the material is not polished and is processed directly, introducing the paper into a bath containing the cleaning solution.
    [007] The invention EP 1,419,829 A1 refers to the removal of ink on printed films, but the method used is completely different, since the film is treated without being previously pelleted and, although the method of separation used is a method Chemical, it is comprised of organic solvents and non-ionic surface active agents.
    [008] With respect to the last previous document, the main difference consists of the material to be treated. The invention CA 2101181 consists of a process for recycling composite containers with multiple layers formed by a polymer layer, another metallic layer (usually aluminum) and another layer of paper or cardboard. The printed ink that is removed by means of water vapor is normally found on the sheet of paper or cardboard. Part of the ink that sticks to the plastic film is separated by dissolving with a solvent and separating based on the density of the metallic part and the unprinted film, so that the separation principle and the starting material are not the same as the present invention.
    [009] The methods patented in the present, therefore, do not provide any global solution to the problem of removing ink on printed films, while the invention proposed in the present actually solves this problem. BRIEF DESCRIPTION OF THE INVENTION
    [010] In the light of the above, there is a need to seek a global solution to the problem of removing ink over printed films.
    [011] The main advantage of the method described in the present is the fact that it allows the separation of the printed ink and the obtaining of a clean ink film by means of an economically viable solution, increasing the added value of the recovered product. In addition, pigments are also obtained that can be used in other applications, so that the residue is reduced to a minimum.
    [012] Considering the increase in costs derived from starting materials, it is increasingly necessary to make better use of plastic printing waste to reduce production costs and this method is ideal to achieve the aforementioned purpose.
    [013] With the present invention, two products are obtained from the printed film: pigments that can be reused for the same and other applications after treatment, such as that described in the patent ES2344778 Bl, for example, and the colorless recycled film it is in the form of pellets that can also be used, in which the mentioned colorless film is a product with a higher quality than the colored film.
    [014] The present invention therefore relates to a method of removing paint contained in the plastic film by using different physicochemical treatments. By means of the present invention, the technical problem involved in recycling the printed film is solved by obtaining an ink-free product suitable for recycling in any type of application due to its high quality and purity. The method described herein can be used on the printed product that has already been used by the end user or on printing materials formed by production residues and, in this case, the material tends to be in the form of jumbos (rolls of material which have a width of 1.5 m and variable thickness) or smaller and thinner rolls, as well as dispersed material.
    [015] The steps of the method are described below. STEP 1: MATERIAL CONDITIONING
    [016] The first stage of the present invention consists of conditioning the material. For this purpose, the cylindrical core, normally made of cardboard, on which the film is supported, is removed to facilitate the polishing operation. This is achieved by means of manual or mechanical removal of the core from the plastic film reels. STEP 2: POLISHING
    [017] The second step of the method is polishing the film rolls to a size that can vary from 6 to 14 mm in diameter for subsequent cleaning. For this purpose, the film rolls are inserted into a blade polisher that has fixed and movable blades. STEP 3: REMOVING THE FILM INK
    [018] In the third stage of the method, the cleaning operation of the printed film is carried out, that is, the stage in which the plastic film is separated from the printed ink. For this purpose, the polished material of the polisher is introduced into the cleaning system. The cleaning system consists of three tanks, a cleaning tank and two washing tanks. In addition to the film, appropriate cleaning agents that cause paint to separate from the plastic film are added to the cleaning tank. The operation is preferably carried out under basic conditions. This step is performed in a discontinuous manner for the case of the film and, for this purpose, the cleaning tank is loaded with the polished material from step 2. Necessary quantities of water, cleaning agents and bases are added and the contents of the tank are agitated using country shakers with the appropriate configuration. The ink that was removed from the film and extracted continuously during cleaning. For this purpose, a flow of water is extracted which contains the cleaning solution and the ink.
    [019] The steps are conducted in parallel from that moment on, the film is washed (step 4) and dried (7), on the one hand, and the cleaning solution (step 5) and the pigment (step 6), by on the other hand, they are recovered. STEP 4: WASHING THE FILM
    [020] After treatment with the cleaning solution, the polished film must be introduced in a new washing tank to remove any dispersed ink residues and residues of cleaning solution that may remain. This operation is carried out as many times as necessary until the complete washing of the plastic film and has neither the paint nor the cleaning agents. STEP 5: CLEANING SOLUTION RECOVERY
    [021] The cleaning solution that was generated in step 3 and fed to the centrifuge for recovery. The centrifuge works continuously while the cleaning operation takes place in the tank of step 3 and the solid ink is separated from the cleaning solution. Therefore, after the treatment, two flows, one ink flow and the other cleaning solution flow, come out. In this way, the method is economically and environmentally more favorable, as the cleaning solution can be reused in the cleaning tank and the paint can be treated to recover the pigment and for use in various applications after heat treatment. STEP 6; PIGMENT RECOVERY
    [022] Heat treatment consists of a heat treatment reactor in which heating is provided and whose function is to decompose the resin to obtain recycled pigment. STEP 7: DRYING THE FILM
    [023] Finally, after washing the film that was carried out in step 4, the plastic film must be dried to remove the remaining water content. For this purpose, the wet material is passed through a mechanical separation element as well as a briquette machine to remove as much water as possible or drying is carried out by means of hot air. BRIEF DESCRIPTION OF THE FIGURES
    [024] Figure 1 shows a diagram of the method object of the present invention, as well as equipment handles involved in the present invention.
    [025] Figure 2 shows a detailed diagram of the cleaning system of the ink removal method of the printed film. DETAILED DESCRIPTION OF ACHIEVEMENTS
    [026] The preferred embodiment of the method described in the present invention is described below in view of the drawings.
    [027] The method of removing printed ink on the plastic film comprises the following steps: STEP 1; MATERIAL CONDITIONING
    [028] Inlet 1 printed material can be serpolethylene (PE), polypropylene (PP), polyester film (PET) or polyamide (PA). After collecting the printed input material 1, a conditioning step is carried out in which the nuclei in which the film, as well as any object whose composition is not a plastic film in the form of jumbo or dispersed material, are removed. The equipment responsible for removing the core that supports the plastic 101 consists of a plunger that applies force to the cylindrical core and keeps the plastic film roll fixed. The cylinder is separated from the plastic body by applying pressure. After carrying out the conditioning, an impurity-free film by-product 2 is obtained which contains the film rolls without the cores and the dispersed input material. STEP 2: POLISHING
    [029] The particle size of the impurity-free film 2 must be reduced to a diameter that can vary from 6 to 14 mm to favor the penetration of the cleaning solution. For this purpose, it is introduced into a blade polisher 102 which comprises fixed and movable blades. This polisher reduces the size of the film until a polished material is obtained 3. STEP 3: FILM INK REMOVAL
    [030] The paint must be removed from the polished material 3, in order to be introduced into the cleaning system 103 with the cleaning solution 6 which consists of a mixture of surfactants in water, in proportions of 0.1 to 5% by weight and basic pH 11 to 13, in which the ink contained in the film is removed and then becomes part of the cleaning solution in undissolved form. In a preferred embodiment, the surfactants in the cleaning solution are hexadecyltrimethylammonium bromide, dodecyltrimethylammonium bromide or dodecyl sulfate. The cleaning system 103 consists of the system formed by three tanks which is shown in Figure 2. The cleaning tank 201 is a stirred tank with parts where the plastic film is placed in contact with the cleaning solution 6. The other two tanks they are washing tanks that start to operate in the subsequent stage. Three flows enter this cleaning system 103, that is, the flow containing the polished material 3, where the flow contains the cleaning solution 6 and the flow containing clean water; and two other flows that are described below come out of said system. The flow containing the polished material 3 enters the cleaning system 103 that feeds the cleaning tank 201. The cleaning solution 6 of the centrifuge 104 also enters that cleaning tank. It is very important that the pads of the cleaning tank 201 cause high turbulence within the agitated tank with pads, in order to avoid overlapping the polished film pieces with each other and, therefore, to increase the efficiency of the method. In addition, turbulence also favors the dispersion of the paint that separates from the film in the cleaning solution 6. On the one hand, the treated plastic film 21 containing cleaning solution and dispersed ink residues leaves the cleaning tank 201 and, for on the other hand, the cleaning solution together with the paint removed from the film 4 exits the cleaning tank 201 towards the centrifuge 104. STEP 4: WASHING THE FILM
    [031] Two consecutive washing methods are carried out in the same cleaning system 103 in two wash tanks with pas. The cleaning tank 201 is washed with water in the first washing tank 202. The film of the first washing tank 202 is placed in contact with clean water in the second washing tank 203 to remove residues from the cleaning solution. The treated plastic film 21 is introduced into the first wash tank 202 to remove dispersed ink residues and cleaning solution residues. The washing liquid 25 exiting the first washing tank 202 is fed to the cleaning tank 201 in order to save water. The washed plastic film 22 containing wash solution residues exits the first wash tank 202 and is fed to the second wash tank 203. This second wash removes the last residues of the cleaning solution that may remain in the plastic. Two streams leave the second wash tank 203, that is, a stream containing the clean ink-free film and residues of cleaning solution 8 which is fed to the briquette machine 106; and another flow containing washing water 24 which is fed to the first washing tank 202 to save water. STEP 5: CLEANING SOLUTION RECOVERY
    [032] The cleaning solution together with the paint removed from the film 4 must be regenerated continuously using a centrifuge 104, at 10,000 revolutions per minute. This equipment consists of a centrifugal separator to separate the cleaning solution 6 from the paint 5. The cleaning solution 6 is reintroduced into the cleaning system 103, reducing the consumption of cleaning solution that the method would have if the mentioned solution was not reused. STEP 6: PIGMENT RECOVERY
    [033] The flow containing the ink 5 is fed to a heat treatment reactor 105, in order to destroy the resin structure and the pigment ready for reuse 7 leaves the said reactor. The heat treatment reactor operates at a temperature of 170 to 200 ° C. A mixture of pigment and oil is introduced into the reactor, in which the resin containing the pigment is thermally destroyed. Vegetable oil, such as sunflower seed oil or lineage oil, and mineral oil, can be used. The reactor operates with vigorous agitation and the average residence time of the pigment is one hour. The mixture is filtered after the treatment to separate the pigment from the oil and the oil and is reintroduced into the reactor to continue the treatment of more pigment. The pigment is therefore free of resin and can be used in a variety of applications. STEP 7: DRYING THE FILM
    [034] The clean film free of ink and cleaning solution residues 8 is formed by the clean film after removing the ink 5 and washing it with cleaning solution 6. This plastic is introduced in the briquette machine 106 which consists of a drying element that removes as much water as possible by pressing and compacting the material. A stream containing an ink-free polished film and cleaning solution 9 ready for use in other applications leaves the briquette machine 106.
    [035] As previously mentioned, two products, on the one hand the pigments and, on the other hand, the colorless recycled film in the form of pellets, are generated by this method.
    权利要求:
    Claims (11)
    [0001]
    1. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, characterized by comprising the following steps: conditioning the printed material (1) in a system comprising a plunger (101) to separate the nuclei or any material other than plastic film , obtaining an impurity-free film (2); polishing the impurity-free film (2) in a polisher (102); removing paint from the film (3) in a cleaning system (103) comprising at least three tanks (201 , 202, 203), the first being a cleaning tank (201) agitated with parts in which the film is polished and treated with a cleaning solution (6) consisting of surfactants in water (25) under basic pH, in which a agitated cleaning tank with powder generating a treated plastic film (21) that still contains part of that cleaning solution and the dispersed ink residues and, in addition, the cleaning solution together with the ink removed from the film (4); of the plastic film (21) treated in the cleaning system of step c, and but at least two wash tanks (202, 203) obtain a clean film (8) free of ink and residues from the cleaning solution; recovery of the cleaning solution (6), used in step c, in a centrifuge (104); recovery of the pigment (7) in a heat treatment reactor; drying of the clean film (8), produced in step d, in a drying element (106) to obtain a polished film (9) free of ink and cleaning solution.
    [0002]
    2. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized in that the printed input material can be polyethylene (PE), polypropylene (PP), polyester film (PET) or polyamide (PA).
    [0003]
    3. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized by the size of the film free of impurities after polishing has a diameter of 6 to 14 mm.
    [0004]
    4. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized by the cleaning solution (6) which gives a proportion of surfactants in water of 0.1 to 5% by weight.
    [0005]
    5. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 4, characterized by the cleaning solution conferring hexadecyltrimethylammonium bromide, dodecyltrimethylammonium bromide or dodecyl sulfate as surfactants.
    [0006]
    6. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 4, characterized by the cleaning solution (6) having a pH of 11 to 13.
    [0007]
    7. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized by the washing step being carried out in two washing tanks (202, 203), working in series and countercurrent, in the first tank (202 ) being washed with the recirculated water (24) of the second tank (203) and in the second tank being washed with clean water (23).
    [0008]
    8. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized in that the centrifugation speed is 10,000 revolutions per minute.
    [0009]
    9. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized by the recovery of the pigment from step f) to be carried out at a temperature of 170 to 200 ° C of a mixture of paint (5) with vegetable oil or mineral, in a reactor by vigorously stirring for one hour, thermally destroying the resin contained in the paint, and leaving the pigment, which is recovered by filtration, while the 61 is separated and reintroduced to the reactor to continue the paint treatment and recovery of more pigment.
    [0010]
    10. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized in that the drying step is carried out by means of a briquette machine.
    [0011]
    11. METHOD OF REMOVING PRINTED INK ON A PLASTIC FILM, according to claim 1, characterized in that the drying step is carried out by means of hot air.
    类似技术:
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-11-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-05-05| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2020-08-04| B09A| Decision: intention to grant|
    2020-11-24| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/03/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    ESP201200320|2012-03-26|
    ES201200320A|ES2427019B2|2012-03-26|2012-03-26|Procedure for removing ink printed on plastic film|
    PCT/ES2013/070161|WO2013144400A1|2012-03-26|2013-03-13|Method for removing ink printed on plastic films|
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