EP3743288A1 - Verfahren zur vorbehandlung von materialien für den flexodruck mittels mobiler niedertemperaturplasmaanwendung - Google Patents
Verfahren zur vorbehandlung von materialien für den flexodruck mittels mobiler niedertemperaturplasmaanwendungInfo
- Publication number
- EP3743288A1 EP3743288A1 EP19702068.8A EP19702068A EP3743288A1 EP 3743288 A1 EP3743288 A1 EP 3743288A1 EP 19702068 A EP19702068 A EP 19702068A EP 3743288 A1 EP3743288 A1 EP 3743288A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- temperature plasma
- cylinder
- adhesive
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
- B41N6/02—Chemical means for fastening printing formes on mounting boards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
Definitions
- the present invention relates to a process for the pretreatment of materials used in the
- Flexographic printing can be used by means of mobile low-temperature plasma application. This method is used for the pretreatment of flexographic printing plates and / or printing cylinders for both the partial and areal increase in their adhesive force in adhesive processes while at the same time still given repositionability and the improvement of their
- Flexographic printing is a web-fed rotary printing process.
- the printing motif having flexographic printing plates also referred to as printing plates
- these are photopolymer plates made of UV-sensitive plastic or laser-engraved printing plates made of rubber - attached by double-sided pressure-sensitive adhesive tape on printing cylinders.
- the printing surfaces which are higher in these printing plates, as the non-printing surfaces are inked before printing with ink.
- the adhesive bonds between the adhesive tape and the printing plate, on the one hand, and between the adhesive tape and the printing cylinder, on the other, must be precisely matched to the materials to be bonded and the printing technology requirements.
- the final attachment must be designed so that even after a large number of revolutions of the printing cylinder and thus a large number of carried out pressure movements and a force acting as a result of the rotational force force the connection between the cliché and impression cylinder is error-free and no lifting of the edges of the printing plate takes place.
- the adhesive tape should also be as simple as possible - ie without great force and destruction - as well as residue-free release of cylinder and cliché, so as to allow the reusability of these materials.
- These sometimes contradictory requirements require the use of the most precisely matched materials and processes at different points in the entire flexographic printing process.
- Adhesive bond but then also at elevated temperatures and at higher
- Printing speeds is so strong that no lifting of the edges takes place during the printing process and still the tape can be easily removed after completion of the printing process residue-free of cylinder and pressure plate.
- Different tools are used at different points in the printing process to precisely match the requirements of each job. For example, e.g. depending on the desired printing process, the carrier materials of pressure-sensitive adhesive tapes, the types of adhesive, the layer thicknesses of the adhesive layers or the adhesive surfaces, where the adhesive can be present over the entire surface or in certain structures, which then in particular may be necessary
- Another problem of flexographic printing is generally the use of solvents in the process.
- printing clichés and printing cylinders are often cleaned of adhesive residues with the aid of solvents for the purpose of reuse after completion of a printing operation.
- An exact dosage or an exact orders of solvents is hardly possible here, so that the Danger of unwanted contamination of the materials used in places where actually no solvents should go, is relatively large.
- EP 2 956 517 A1 e.g. EP 0 890 753 A1 and EP 1 307 342 B1 describe possible advantages of somewhat structured adhesive surfaces for use with double-sided flexographic printing tapes, flexographic printing tape substrates e.g. are topic of
- DE 103 47 025 A1 has already described a double-sided adhesive tape with a film carrier for fixing printing plates, in which the surface of the film on one or both sides at least partially by plasma treatment, preferably plasma coating is modified in such a way that the affinity for PSA is increased by increasing the surface energy.
- liquid primers e.g. also a physical pretreatment of both to be bonded substrates and the adhesives used for many years common practice.
- pretreatment methods include corona, flame or
- Plasma applications that serve to clean the surfaces to be bonded, by activating the surface to increase the effective bond area or to produce generally more favorable conditions for their wettability. But these too
- the joining partners are generally pretreated with such plasma hand-held devices, ie with the plasma emitted by the hand-held device it is possible to clean surfaces and increase their tension and thus to improve the adhesive properties of lacquer or adhesives on these surfaces.
- the plasma discharges take place either via a type of arc or via a piezoelectric effect resulting from opposite polarization directions of the crystal.
- An advantage of this latter method is that a cold, non-thermal plasma is formed at near room temperatures, thereby avoiding the possible in other types of plasma applications, due to an increased temperature due to the plasma treatment and negative for the intended application negative effects on the plasma-treated surface.
- Targeted and selective means that the low-temperature plasma is not generated consistently on the materials to be bonded and / or the adhesive surface, but only to a limited extent and at certain alternating with non-plasma machined surfaces areas.
- Low-temperature plasma pencil for example, a piezobrush low-temperature plasma gun
- a piezobrush low-temperature plasma gun meets all the requirements for safe and reliable flexographic printing
- the pretreatment with the low-temperature plasma pen is carried out substantially continuously in a width of about one centimeter across the width of the printing plate, in each case at the beginning and at the end of the printing plate to be fastened around the printing cylinder.
- the surface of the printing cylinder is treated before the bonding after cleaning with isopropanol partially with the low-temperature plasma pen. In a further preferred embodiment, the surface of the printing cylinder before the
- Bonding partially, but largely consistently in a width of about one centimeter across the width of the printing cylinder away at each at the beginning and the end, where the printing plate is attached to the printing cylinder around, treated with a low-temperature plasma pen.
- the printing plates or printing cylinders pretreated according to the above embodiments have the advantage that after removal from the printing cylinder no adhesive tape residues on the printing plates or the printing cylinder are present after the end of the printing process.
- pretreatment with a low-temperature plasma pen in comparison to a surface which is only cleaned with isopropanol or with an additional corona-pretreated surface does not result in any disadvantages with regard to the requirements of one
- Polyacrylate base with a foam carrier material for use in flexographic printing i. to
- peel force is generally understood the force necessary to strip an adhesive tape from a defined test surface.
- Adhesive tape is peeled off at a defined angle of 90 ° C. ⁇ 180 ° C. and the force is measured in N / cm.
- Patent Application DE 10 2017 000 494 A1 The aim of the device described therein is to provide the peel resistance of double-sided pressure-sensitive adhesives used in flexographic printing
- Open and covered sides of the tape mean the following: Double-sided tapes are usually covered by a single release liner. Such a release liner is non-sticky on both sides, e.g. as a result of a
- Figure 1 is a diagram showing the bond strength as a function of the pretreatment method
- FIG. 2 is a diagram showing the T-Peel values in dependence of
- FIG. 4a shows the test setup relevant for flexographic printing for the simulation of a
- FIG. 4b shows the test setup relevant for flexographic printing for the simulation of a
- FIG. 5 shows the test results of the application-technical examination in FIG.
- the bond strength values between the covered side of the adhesive tape and a replacement material for photopolymer plates, a 125 ⁇ m thick PET Mylar film (PET-0083) as a substitute for the actual cliché base material were measured 10 minutes after application (see FIG , minimum, maximum and average). The aim of this measurement was to determine general, independent of the actual application in flexographic printing differences in the bond strength of the two pressure-sensitive adhesive tapes, to later on this basis
- the T-peel test is used to characterize the peel behavior of peel systems and is performed on the basis of ASTM D 1876 and DIN 55529.
- the term "T” aims at the presence of two peel arms, which are each bent by 90 ° during the peel test, resulting in a "T-shape".
- the T-peel test is performed on a universal testing machine.
- the tendency was similar here to the results according to the "cylinder peeling method" shown in FIG. 1: the measurements in the samples pretreated with a primer pin produced significantly higher bond strengths than the three other pretreatments.
- FIG. 3 then shows the contact angle as a function of the surface pretreatment.
- the wettability of surfaces is a feature that provides information on whether it is a low-energy and therefore poorly bondable surface or a high-energy and therefore better bondable.
- the wettability is assessed by means of a water drop applied to the surface. If, after application, an actual water droplet forms, the surface is low-energy
- Water drops are a high-energy surface.
- test inks are usually used and the contact angle is measured (measurement methods according to DIN 53364 and ASTM D 2578-84).
- the measured contact angle should be as small as possible.
- the contact angle of the liquid drop depends on the surface energy of the liquid as well as the surface to be bonded.
- the four different pretreatment methods referenced in the present application (in addition, a contact angle measurement without any preparation of the film surface was also compared) have different effects on the surface energy of the surface to be bonded; the best values with regard to a possible bond also showed here primer-pretreated surface.
- FIGS. 4a and 4b show the test setup relevant for flexographic printing for the simulation of a printing process, once from the side of the printing cylinder (FIG. 4a) and FIG once from the side of the printing plate ( Figure 4b).
- Fig. 5 finally contains the
- Hard rubber pressure roller used with a Shore hardness A of 20, the two at each
- Hardness measurements of materials are carried out in accordance with DIN ISO 7619-1. It measures the indentation / penetration depth of a steel pin into the material in question - in Shore A, the steel pin has the geometry of a truncated cone and in Shore D that of a needle point.
- the Shore A hardness of 66 of the printing plate plays a role in the present case because it simulates difficult printing conditions as a relatively hard material in conjunction with the relatively small circumference of the sleeve of 380 mm and the relatively large thickness of the printing plate of 2.54 mm: the elasticity properties
- the pressure plate in conjunction with the circumference of the sleeve in principle require an increased tendency of edge lifting of the pressure plate from the sleeve.
- Adhesive tapes from the printing plate Adhesive tapes from the printing plate.
- Kantenabhub was only 1 mm (upper edge) and 2 mm (lower edge), while it was at the plasma-pen treated surface at 3 and 2 mm and in the corona-pretreated as well as the completely untreated
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Printing Plates And Materials Therefor (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018000588.8A DE102018000588B4 (de) | 2018-01-25 | 2018-01-25 | Verfahren zur Vorbehandlung vom Materialien für den Flexodruck mittels mobiler Niedertemperaturplasmaanwendung |
PCT/EP2019/051901 WO2019145504A1 (de) | 2018-01-25 | 2019-01-25 | Verfahren zur vorbehandlung von materialien für den flexodruck mittels mobiler niedertemperaturplasmaanwendung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3743288A1 true EP3743288A1 (de) | 2020-12-02 |
Family
ID=65237040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19702068.8A Withdrawn EP3743288A1 (de) | 2018-01-25 | 2019-01-25 | Verfahren zur vorbehandlung von materialien für den flexodruck mittels mobiler niedertemperaturplasmaanwendung |
Country Status (5)
Country | Link |
---|---|
US (1) | US11560011B2 (de) |
EP (1) | EP3743288A1 (de) |
CN (1) | CN111655505A (de) |
DE (1) | DE102018000588B4 (de) |
WO (1) | WO2019145504A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018005315B4 (de) | 2018-07-05 | 2022-08-11 | Lohmann Gmbh & Co. Kg | Flexible Corona- oder Plasma-Bewegungseinheit |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5930832A (ja) | 1982-08-13 | 1984-02-18 | Shin Etsu Chem Co Ltd | 表面特性の改質されたフツ素系樹脂成形品 |
DE3635737A1 (de) | 1986-10-21 | 1988-04-28 | Basf Ag | Verfahren zum fixieren einer mehrschichtigen reliefdruckform fuer den flexodruck |
DE9016999U1 (de) * | 1990-12-17 | 1992-04-16 | Beiersdorf Ag, 20253 Hamburg | Klischee-Montageband |
WO2002007960A1 (en) * | 2000-07-26 | 2002-01-31 | World Properties, Inc. | Compressible foam tapes and methods of manufacture thereof |
US6655281B1 (en) * | 2000-08-08 | 2003-12-02 | 3M Innovative Properties Company | Flexographic printing elements with improved air bleed |
JP2005514237A (ja) * | 2002-01-08 | 2005-05-19 | テサ・アクチエンゲゼルシヤフト | 印刷版用の感圧接着テープ |
JP2005035003A (ja) | 2003-07-15 | 2005-02-10 | Konica Minolta Medical & Graphic Inc | 版下シート材料、版掛け方法及び印刷方法 |
US6912955B2 (en) * | 2003-08-21 | 2005-07-05 | Reeves Brothers, Inc. | Metal-backed printing blanket |
DE10347025A1 (de) * | 2003-10-07 | 2005-07-07 | Tesa Ag | Beiseitig klebend ausgerüstetes Klebeband zur Fixierung von Druckplatten, insbesondere von mehrschichtigen Fotopolymer-Druckplatten auf Druckzylindern oder Hülsen |
DE10347024A1 (de) * | 2003-10-07 | 2005-07-21 | Tesa Ag | Beidseitig klebend ausgerüstetes Klebeband zur Fixierung von Druckplatten, insbesondere von mehrschichtigen Fotopolymer-Druckplatten auf Druckzylindern oder Hülsen |
DE102008023758A1 (de) | 2008-05-09 | 2009-11-12 | Tesa Se | Haftklebebänder zur Verklebung von Druckplatten |
DE102012211075A1 (de) * | 2012-06-27 | 2014-05-08 | Tesa Se | Haftklebemasse insbesondere zur Verklebung von Druckklischees auf Druckzylindern für den Flexodruck |
DE102012215345A1 (de) * | 2012-08-29 | 2014-03-06 | Tesa Se | Gerilltes Klebeband |
DE102013100617B4 (de) | 2013-01-22 | 2016-08-25 | Epcos Ag | Vorrichtung zur Erzeugung eines Plasmas und Handgerät mit der Vorrichtung |
CN104995273B (zh) | 2013-02-18 | 2017-10-20 | 3M创新有限公司 | 压敏胶带及其制成的制品 |
DE102016203413A1 (de) * | 2016-03-02 | 2017-09-07 | Tesa Se | Erhöhung der Abzugskraft durch selektive Plasmavorbehandlung |
DE102016213183A1 (de) * | 2016-07-19 | 2018-01-25 | Tesa Se | Haftklebemassen für die Verklebung von flexiblen Druckplatten |
DE102017000494B4 (de) * | 2017-01-20 | 2018-10-04 | Lohmann Gmbh & Co Kg | Konditionierungs-, Abzugs- und Prüfvorrichtung zur anwendungsnahen Simulation der Verklebung von Druckplatten auf zylindrischen Prüfsubstraten mittels Haftklebebändern |
-
2018
- 2018-01-25 DE DE102018000588.8A patent/DE102018000588B4/de not_active Expired - Fee Related
-
2019
- 2019-01-25 CN CN201980010252.3A patent/CN111655505A/zh active Pending
- 2019-01-25 EP EP19702068.8A patent/EP3743288A1/de not_active Withdrawn
- 2019-01-25 WO PCT/EP2019/051901 patent/WO2019145504A1/de unknown
- 2019-01-25 US US16/964,766 patent/US11560011B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102018000588B4 (de) | 2020-01-30 |
CN111655505A (zh) | 2020-09-11 |
US20210053379A1 (en) | 2021-02-25 |
US11560011B2 (en) | 2023-01-24 |
WO2019145504A1 (de) | 2019-08-01 |
DE102018000588A1 (de) | 2019-07-25 |
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