DE1571821A1 - Multi-color screen printing process and multi-color screen printing device - Google Patents

Description

DR. ING. F. WtTESTHOFF DIPL ·. ING. G. PULSE tblbfow 22 O β 51 DR.E.V.PECIIMANN tkliohammadhksse

PATENTANWÄLTE 1571821 Ρΐοτ «οτριτ« ΗΤ

1Α-31 870 description

to the patent application.

ADVANCE PROCESS SUPPLY CO., Chicago, Illinois, U.S.A.

concerning

Multi-color screen printing process and multi-color screen printing device.

The invention relates to "improvements in screen printing processes, and it relates in particular to methods and / or devices that allow multicolored printing of colors with the help of the screen printing process on a base without having to wait for each individual color to dry takes until the next color swatch is applied.

As is known, the screen printing process is already used both used in single-color printing as well as in multi-color printing · Single-color screen printing does not present any particular difficulties, because the printed object is only stored on a suitable drying rack until the printing ink or any other coating material has dried. However, in the case of multi-color screen printing, it has been necessary to date to have a pattern to print a certain color on the object to be printed, Allow this sample to dry and then another color sample of a different color using the screen printing process to apply to the object so that the

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desired combination of colors. The use of the screen printing process in multi-color printing, in which one between Having to provide a drying period for successive jerking processes is very uneconomical because it results a large amount of time, and large storage rooms are required for the printed items that are between successive ones Printing processes need to be dried.

Attempts have already been made, procedures and / or goal directions to develop the application of an -elir color printing process enable, without having to wait for the drying of the printed surfaces before further printed luster on of the base. Various arrangements of spacer elements were used for the printing screens, In order to prevent the "back colors" from being smeared, various attempts were made to dry the printing ink or to accelerate the applied coating between successive printing processes. These attempts, procedures or To provide devices for multicolor screen printing in such a way that that you can do without wiping dry but remained without any practical success, and until now there is no practically usable Liehrfarben — Siebdruckvorrich— service that does not require a Carry out intermediate drying of printed surfaces.

It is now an object of the invention to provide a novel and improved screen printing process which it enables several colors to be printed separately on one To apply the item without any intermediate drying; of applied printing inks is required. , _

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Another object of the invention is to provide a novel and improved multicolor screen printing device which When used, intermediate drying of the separately applied color samples can be dispensed with *

A feature of the invention is that it provides a new and improved screen-printing method according to which a to be printed iie _ö -enstand is printed with various separate color patterns, wherein a plurality Schablcmensiebe used werdenj According to the invention each screen, which follows the first screen mask , provided with a spacer screen in which the mesh size * and the wire diameter are selected so that the printing screen does not come into contact with the printing ink that was applied during a previous printing process.

Another feature of the invention is that it provides a novel and improved apparatus for teaching color screen printing, in which an object to be printed is continuously and intermittently transported from one station to the next in order to provide several color patterns in succession at each -LTucking station Each printing station following the first printing station is equipped with a spacer screen in which the screen size and the wire diameter are selected so that the printing ink from the previously printed areas does not come into contact with the surface of the screen stencil on the affected area. -.Print station. comes. . ·: 'Ϊ́ ^ Μ r * =: · ν ■

The connection will be more schematic in the following on sand to sehrejrerL A ^ sfühi'urigsbeisBieien "explained in more detail.

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Pig, 1 shows in plan a screen stencil for applying a color pattern to an object to be printed.

Fig. 2 shows in Grundriß.-a second screen template for Applying a second color pattern to one to be printed

Fig. 3 shows in plan a third Siebschailone for Application of a third color sample to each item to be printed.

FIG. 4 is a top plan view of a printed article made using that shown in FIGS. 1-3 tfiebschablonen has been printed.

FIG. 5 is a section taken along line 5-5 in FIG. 1. Fig. 6 iot a section along the line 6-6 in rig. 2. FIG. 7 is a section along the line 7-7 in FIG. 3.

Fig. 8 is an enlarged ^x eilaarstellung of the distance and the screen shown in Fig. 7.

FIG. 9 is a section taken along line 9-9 in FIG. 8.

rig. 10 i:; t a side view of a device for carrying out the in ^ ig. 1 to 9 using screen printing processes.

rig. 11 shows in perspective the docking station of the device according to Fig. 10.

Fi ^. 12 is a schematic division of a - ^ rucksta-cion a device comprising four ^ jpucis ^ atlo ^ nerM

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Pig. 13 shows a schematic side view four ■ '-' back stations comprehensive device for performing the screen printing process according to the invention.

Pig. Figure 14 illustrates schematically the application of the invention to a cylinder screen printing press.

Pig. 15 schematically illustrates the inventive Use of multiple stencils at a single printing station

Pig. 16 is a schematic illustration of a further embodiment of the invention in which the spacer screen is periodic is moved to clean the surface of the spacer screen.

As noted, the invention provides novel and improved multi-color screen printing devices before. In its simplest form, the method according to the invention can be carried out by hand, or a simple device can be used to carry out the individual process steps »In their training for On the other hand, the invention not only provides a novel process for industrial purposes, but also a novel and improved one Device for performing the invention Multi-color screen printing process.

According to the invention there is provided an article such as a sheet of paper or another piece of sheet material printed at a first printing station using a stencil screen,

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to apply a predetermined color pattern to the object. Then the item printed in this way is transported to a further printing station while the printing ink is still wet is. At the second printing station, a second stencil is brought very precisely into alignment with the printed object, so that a second pattern of ink can be applied to the item prior to that at the first printing station applied paint has become dry. The second printing station comprises a stencil with a visual stencil screen and is with a spacer screen is provided between the screen screen and the object to be printed is arranged. This spacer screen is preferably made of materials on which the printing ink does not adhere, and the thickness and the mesh size of the spacer screen are selected so that the printing ink of the first printed surface does not come into contact with the surface of the stencil screen at the second printing station. At this Arrangement of the spacer screen, the second stencil is brought exactly into congruence with the object to be printed, and A second pattern from a different printing color is pressed through the sheet in such a way that the desired pattern appears the object to be printed appears in exact alignment with the first pattern. The cover layer of the second pattern compared to the first pattern can be such that the two patterns are immediately adjacent to one another, or that one Overprinting of the first pattern takes place. The mentioned exact coverage is not necessary for the patterns to be printed to keep separate from each other, but to prevent the spacer screen itself from creating a pattern that is opposite to the first pattern is offset.

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If to be printed on the uegenstand a third and / or a fourth color is the aegenstand conveyed to a third and a fourth -uruckstation where again a stencil in exact Leckung with the ^u e ^ enstand is brought. As with the second printing station, the stencil at the third and fourth printing stations is provided with a similar spacer screen that prevents the damp printing ink that was applied at the previous printing stations from coming into contact with the surface of the template screen. With the help of this arrangement of the back stencils and the spacer sieves and with a view to the very exact coverage of the following stencils with the printed surfaces of the object, it is possible to achieve multi-color prints with or without overprinting previously printed areas without the need to do so to wait for the ink to dry which has been applied to the individual printing locations.

In some cases, the ink sticks something to it Spacer sieve, sccidaß after several -'- 'jerks one Layer on the back color has built up. This difficulty leaves Avoid yourself if you have an appropriate form of training the binding used, with aer the spacer sieve periodically moves v.-earth, oc äu.i it always has a clean spacing surface. The part of the spacing to which the: printing ink adhered, is then washed and dried before being used again wira, ui to act as an abotandsorgan for aie print template.

In ..- "1 / .. 1 biö 9 the area templates are shown schematically, iie c-ii ae different steps of the inauguration ^ emäiien »Experienced to be used. In Tig. 1 can be recognized

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a stencil 1 with a frame 2 and a stencil screen 3> which latter is provided with a number of openings 4. The template 1 is provided with a squeezing member 5 and a supply

6 provided by printing ink. Fig. 5 shows a section along the line 5-5 in Pig. 1 shows the relationship between template 1 and the suction to be printed 7. The stencil is brought to bear on the sheet 7, and the Quetsehorgan 5 causes the Printing ink 6 is moved along the surface of the screen 3 in order to apply the desired pattern to the sheet 7 via the openings 4 to raise.

ll after the end of the jerk process at the erotic station the template 1 is lifted off and the printed sheet 7 is transported to the second printing station shown in Fig. 2 while the printing ink is still wet. On the second According to FIG. 2, a printing station, designated as a whole by 8, is arranged, which has a frame 9 and a stencil screen 10 includes. The sieve 10 has openings 11 accordingly a chandelier in front of distillates. The template 8 is also provided with a supply 12 of printing ink, aie related to its 2 "color differs from the printing color on the stencil 1, and furthermore there is again a ^ uet ^ ch or string organ 13 provided. Furthermore, the ^ template 8 with a Acütandssieb 14 equipped, which prevents the stencil screen 10 in j3erüh.2'ur .._ ^ it the damp - ^ back color on the sheet

7 is coming. The uns = units of this printing station are from FIG. 6 apparent, v: o Laa iie relationship between the template screen 10 and the Abstandsöiet 14 as well as the ^ ruckco ^ en 7 recognizes, , .during the at the aer era, s printing station on the sheet

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If the color sample is still damp, the spacer screen 14 attached to the frame 9 ″ will come to rest at the second printing station brought the sheet 7, the stencil screen 10 is in exact register with the sheet 7, so that a second Color can be printed on the sheet in exact coverage or overprinting the previously printed pattern. at This exact covering position of the screen stencil the coating element 13 is actuated in order to apply the printing ink 12 to the openings 11 thereof to press through the stencil 10 and thus apply a second pattern to the sheet 7; in the present case will the printed background 4a shown in Fig. 4 is partially overprinted.

The stencil 8 and the spacer screen 14 are now lifted off, and the sheet 7 is sent to the next printing station transported while the printing ink, which was applied during the two previous operations, is still wet is. The sheet 7 is conveyed to the printing station shown in FIGS. There is a stencil screen at this station provided comprising a frame 16 with a stencil screen 17; the sieve 17 has a predetermined pattern 18 in shape of openings. The template 15 is provided with a torrent 19 a different colored printing ink and provided with a coating element 20 for applying the printing ink to the 3ogen 7. In addition, the template 15 carries a spacer screen 21, which appears in Fig. 7 in section.

While the printing ink applied in the previous printing processes is still wet, the third printing station the spacer screen 21 attached to the frame 16 for

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Brought to the printing sheet 7, wherein the üchablonensieb is in exact congruence with the previously printed areas of the bow. With this exact covering position of the stencil screen the coating member 20 is actuated in order to print the printing ink 19 through the openings 18 and thus a third color swatch to generate on the sheet.

In Fig. 4 one recognizes the finished printed sheet 7 with the various printed areas 4a, 11a and 18a corresponding to the mentioned stencil screen openings through which the inks in question were pressed through.

The spacer screens 14 and 21 are of the same type and can optionally be used in one or more further printing processes to be used. The printing screen 3 or 10 or 17 preferably consists of threads with a diameter of approximately 0.035 up to about 0.005 mm, with the mesh size being determined by the fact that about 200 to 400 threads per inch are provided. Fig. 8 9 and 9 show further details of the spacer screen 14 and 21, respectively. The screen 14 is made up of a woven mesh of endless threads 22, which consist of a material to which the printing ink preferably does not adhere. The diameter of the threads is preferably about 0.035 to about 0.33 mm, and each Inches are about 4 to 200 threads. The dimensions of the threads and the screen openings are chosen so that the screen printing stencils a sufficient distance from the sheet to prevent ink from falling off the previously printed parts come into contact with the stencil screen. It is important that you use a sieve that consists of endless single threads, and that the spacer sieve one

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Mesh size in the specified range. Also is it is imperative that the printing ink used in the individual printing processes be thixotropic. Preferably be thixotropic printing inks are used, which form a thin layer, the thickness of which in the wet state is about 0.01 to about 0.10 mm amounts to. In order to prevent the creation of an offset print image by the spacer sieve, the threads of the oiebes exist preferably from a material on which the thixotropic printing ink not liable. Suitable materials for the threads include stainless steel, nylon, polyester, e.g. 3. that under The legally protected name Mylar available material, as well as polytetrafluoroethylene, as it is e.g. under the legally protected name Teflon is available. In Pig. 6 and 7 are the spacer screens 14 and 21 in a small one Distance from the associated templates 8 and 15 shown. In practice, however, the spacer screens 14 and 21 are fixed with the iichablonenraiimen 9 and 16 are connected and they become together with the ocnablonen 8 uni 15 to rest on the printed sheet 7 brought and lifted off again; However, this does not apply to the forms of construction of the device in which the Spacer screen is movable to be cleaned periodically can.

The üesc: iriebene process in which thixotropic printing inks and ax written printing stencils and spacer screens are used, proves to be very versatile in practice "or adaptable. It is possible to create contiguous areas, Line drawings and halftone images can be printed in several colors without the drying of the printing process applied printing ink waited to -, verden needs. the

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Use of thixotropic printing inks, which can be produced with the help of the described pressure stencils and spacer screens in thin Applying layers enables several different colors to be printed one after the other, each with • printing color can be applied while the previously printed areas are still damp.

Exact coverage of the stencils used one after the other is desirable so that the colors can be optimally matched True color printing is achieved, furthermore is an accurate registration between the spacer sieves and the previously printed areas is important if you want to prevent the spacer sieves Create a printed screen pattern that is offset from the previously printed areas. In the form of training, at If a movable spacer screen is used, exact coverage is not so important, because the spacer screen can move v / ground to bring a clean surface into the operating position after each printing, if necessary.

The loop size and the thread diameter for the printing screens and the spacer screens are chosen according to the printing work to be performed. In general, line art and with the help of coarser templates and screens that are filled in with scarce surfaces are printed as halftone images, fine line drawings, lettering and the like.

In Fig :. 10 the essentials can be seen in a side view ^ part of a gate direction to carry out the invention Procedure. 3ei the device according to fig. 10 acts it is a continuously operating screen printing device

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with two stations at which sheets with two different colors can be printed. By, simple, obvious Modifications are possible to design the device so that prints can be made in three or more colors. The device shown in Fig. 10 comprises a frame with a base part 30 and upwardly extending column parts 31 » 32, 33, 34 and 35. The upper ends of these column parts carry a frame 36, the left end of which forms a feed table. The middle part of the frame 36 comprises flat table sections 37 and 38, each provided with numerous holes, which can be subjected to a negative pressure with the help of a suitable negative pressure source, not shown here, to hold the material to be printed on and cause wrinkles or to prevent relocation while the screen printing operations are in progress at the relevant stations.

The frame 36 carries a plurality of sprockets 39, over which a system indicated by dash-dotted lines of endless Chains 40 runs. Two chains 40 are provided, which are arranged parallel to one another on the chain wheels 39 and serve to guide the material to be printed according to FIGS. 11 and 12 through the device. According to FIGS. 11 and 12 the chains 40 are provided with several grippers. These grabs comprise an upper plate 42 and a lower plate 41, carry the gripping fingers 141 and 142, by means of which a printed sheet 7 can be grasped and guided through the device. At the docking station of the device, the plates 41 and 42 are brought into alignment with one another by pins 47. Of the Print sheet is initially supported by front guide pins 143

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and side guide pins 144 aligned.

Furthermore, two pressure frames 43 and 44 are provided which, according to FIG. 10, are rotatably mounted on the frame 36 at 45 and 46, respectively are. The frames 43 and 44 carry stencil screens 1 and 8, as shown in FIG. 10 for the open position of the frame dashed lines is indicated. The screen templates 1 and 8 in FIG. 10 are the same templates 1 and ö according to Fig. 1 and 2j also the mode of operation is in the the templates shown in Fig. 10 are the same. The screen template 1 in FIG. 10 is an ordinary template according to Fig. 1 and 5 »in which there is no spacer sieve. The screen template 8, however, is shown in FIGS. 2 and 6 with a Provided spacer sieve, which can be movably arranged according to FIG.

The frame 43 has a set of pins 47 by means of which the grippers 41 and 42 can be brought into congruence, to initially align the sheet to be printed. If the grippers are moved into the printing position, they are attached to the Print stations brought exactly into the correct register position by pins 48 and 49. The device further comprises a drive device, which is explained in more detail below and serves to actuate the transport chains 40, the printing frames 43 and 44 to open and close as well as the flooding bar and which come into effect during the screen printing processes to operate the string organ.

More specifically, the apparatus includes a motor 50 mounted at 51 on the frame. The engine 50 is in

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the manner indicated in Fig. 10 by a dashed line 52 connected to a drive cam 53, by means of which a rod 54 is operated to operate levers 55 and 56 connected by a rod 57. Levers 55 and 56 actuate further levers 58 and 59 'at their upper ends in the manner indicated by the lines 60 and 61 with the Painting organs and flood bars or rails 62 and 63 are connected. The lower end 64 of the lever 58 is by a rod 65 with a finger 66 on a carriage or Slide part 67 connected. The carriage or slide 67 is supported by two rods 68 extending in the longitudinal direction

carried and can reciprocate along the axis of the device moved to earth. On the carriage 67 two pawls are provided, which with the grippers 41 on the underside of the frame 36 can harmonize together. Does the carriage 67 move in the direction of the feed table, the pawls 69 are brought into engagement with the grippers 41, so that the chains 40 perform an index movement ^ "to the gripper together with the to transport printed sheets from one printing station to the next.

The iiocken 55 is also used to directly connect a To operate lever 70, which is connected to a lever 72 by a rod 71. The levers 70 and 72 are with components 73 and 74, which sit on 75 and 76 and practically form two angle levers. The outer ends of the components or I-lebel 75 and 74 are with bumpers 76 and 77 connected, by means of which the Jruckralusen 43 and 44 in the Can be brought to pressure position or returned again.

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When operating the device, a printed sheet 7 is on the part of the frame 36 forming the feed table is placed and clamped in the grippers 41 and 42. The movement of the carriage 67 by the cam 53 causes the pawls 69, to grasp the gripper 41 on the underside of the frame 36 and the transport chains 40 between the successive ones - ^ jerk stations to move along a distance commensurate with the distance corresponds between the docking station and the first printing station, If the chains 40 are moved, the printed sheet 7 is transported to the first printing station and in smooth contact held on the table section 37 acted upon by negative pressure.

During the printing sheet 7 brought to the first printing station the lock 53 actuates the push rod 76 around the print frame 43 to pivot down into the printing position. At the same time, the bumper 77 is actuated to push the frame at the second printing station to pivot down into its printing position, liacndem the printing frame in their printing position have been brought, causes a further rotation of the Uockens 53 that the fog 58 and 59 are operated to the stroking organs 62 and 63 to move so that the printing ink is pushed through the screen screen in question to the print sheet 7 to be printed in the desired format with the relevant color. The print sheet is at the first printing station precisely aligned by pins 48 which are aligned with openings in the gripper parts 41 and 42, as shown in χ ig. 10 and 12 is shown. The screen template is used at the harvesting printing station 1 to the printing sheet 7 with a] first predetermined

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To provide samples of the desired color. According to FIGS. 1 and 5, the screen template 1 is an ordinary one Template to which no spacer element is assigned.

If the cam 53 continues to rotate, the painting elements 62 and 63 are returned to their original position, and the Push rods 76 and 77 lift the printing frames 43 and 44 from the printed sheets so that the transport chains 40 move further The chains 40 are now operated by the reciprocating carriage 67 in order to move the printing sheet to transport from the first to the second printing station and to feed a new printing sheet to the first printing station. At At the second printing station, the printing frame 44 is pivoted downward into the printing position, whereby it rests against the sheet 7 applies. The sheet 7 is opposite the printing frame 8 by pins 49 which are aligned with the openings of the grippers 41 and 42, put in exactly the right position. The mechanism described in connection with the first printing station works on the second printing station in a similar manner to actuate the coating member so that the printing ink through the second stencil is printed to the sheet 7 in exact register with the previously printed pattern with a second pattern from a second color. According to ..Fig. 2 and 6 has the Printing frame 8 a spacer screen 14, which in the present Case consists of single threads made of UyIon or Teflon. The single threads of the sieve 14 are on the order of about 0.035 to about 0.330 mm in diameter and the mesh width corresponds to 4 to 200 threads per inch.

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If the print frame 8 is swiveled down to fit it To apply the print sheet 7, the spacer screen 14 attached to this print frame prevents the during the first printing process applied ink touches the underside of the screen of the second printing frame. The use of single threads the spacer screen prevents ink from sticking in the screen and the use of teflon prevents retention of printing ink, because the printing ink essentially adheres not on these materials.

After the striker 63 has been operated to the To provide printed sheets with a second colored pattern at the second printing station, the actuation mechanism causes that the printing frame 44 is pivoted upwards and the transport chains 40 are actuated in order to bring the printing sheet to a removal station to transport. After the chains 40 are moved past the second printing station, open the grippers 41 and 42, in order to release the printed sheet 7 and place it on a in Fig. 10 at 81 with dashed lines to drop indicated conveyor belt. The conveyor belt 81 is operated intermittently or continuously to the to feed the printed sheet out of the device »

The device described above with reference to FIG. 10 comprises only two printing stations, if it were desired to provide a third printing station in order to carry out the three-stage printing process shown in FIGS. 1 to 4, the device would have to be provided with a third printing station ; for this purpose one could put the rack and the frame on

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suitable «iron extended so that one could accommodate a further printing table and a third swiveling printing frame as a support for the screen stencil 15. This pressure frame would then be actuated via Ü-estängeteile, which are connected to the -öetetriebes rods for the other _pressure frames.

In Fig. 13 is an apparatus for performing a four-stage Lenrf arben printing process shown schematically. The device comprises four - ^ back stations with vacuum pressure tables 101, 102, 103 and 104, to which templates 105, 106, -107n and 108 are assigned. Each template is provided with a coating member 109, and the templates 106, 107 and 10d are each equipped with a 4 spacer sieve 110 or 111 or 112. The printed sheet 113 is with the help of a conveyor belt 114 supplied via drive drums 115 and 116 runs. These drums are driven by a suitable Actuated drive mechanism, which is operated synchronously with the stencils in order to ensure an exact registration of the printed sheet at the successive ixuck stations across from the Stencils to 'ensure.

A device zxxz can be seen schematically in FIG. 14. Carrying out a three-stage multi-color printing process using cylinder printing presses. The apparatus comprises a cylinder press constructed in the known manner, which is modified in such a way that there are several printing stations without provisions being made to dry the back sheet between adjacent stations; all templates with

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Except those at the first station are with one Provided spacer screen, as described above with respect to other embodiments of the invention.

The device comprises two transport chains 201 similarly those described with reference to FIG. 10, which run over rotatable cylinders 202, 203, 204 and chain wheels 205 and 206. Templates 207, 208 and 209 are assigned to cylinders 202, 203 and 204. Each stencil comes with a painting organ Mistake. The templates 208 and 209 are spaced sieves

211 and 212 equipped. On the paper feed side of the device, a feeding device is provided which comprises drums 213 and 214, over which a feeding conveyor belt 215 runs. A guide 216 is arranged near the conveyor belt 215, by means of which a printed sheet 218 can be guided to the grippers 217 on the chains 201; the grippers 217 correspond to those at ^X1 and of Fi ^. 10 described. The cylinders 202, 203 and 204 have recesses 219 »220 and 221 which receive the grippers 217 when they move past the templates.

The Torriciitun ^ according to Fig. 14 works similarly to one with cylinders a-j most sterile th screen printing machine of known type for adjusting multicolored prints, ^ ie Abstsna ^ siebe 211 and

212 enable the application of the method according to the invention, with; e ... the 3o _fa en can be successively printed with different arls, without between successive jerks. - / etrockr.et to have to be. Senior Citizen 14 in the clockwise direction, and the .ohablonen; the cylinders rotate ^ e..

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move in the direction of the arrows, with the sheets being printed at each station. For the printing ink, the printing templates and the spacer screens again apply the description given above for other embodiments of the invention. At each station, the printed sheet is brought into exactly the right position in relation to the stencils.

Pig. Figure 15 shows schematically the application of the invention to a fixed printing station. The printing sheet 302 is on a Table 301 placed, the location pins 303 and 304 wearing. A first stencil 303 with a coating element 307 is moved for printing on the sheet 302, as is shown in FIG. 15 is indicated on the left by a dashed arrow. Then the template 305 is removed, whereupon the stencil 306 with the painting element 307 is moved downwards, as shown in FIG. 15 on the right-hand side by a dashed line Arrow is indicated; Here the position of the template is precisely determined by the pins 303 and 304. the Template 306 is provided with a spacer screen 308a so that the sheet 302 can be printed one after the other with different colors without intermediate drying being necessary, as above for other embodiments of the invention has been described.

Fig. 16 shows schematically a modified embodiment of the invention, in which the spacer screen during the Operation of the device is gradually moved and cleaned. The print frame 120 corresponds to the print frame already described devices according to the invention. The print frame

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carries a stencil frame 121 and a movable spacer screen 119. As in the case of the forms of embodiment already described, a stencil screen 122 is assigned to the stencil name 121, with which a string organ 123 cooperates.

The -Uruckrahinen 120 is pivotally mounted at 124 and provided with a frame comprising support members 125 and 126. The support members 125 and 126 serve as supports for Deflection rollers 127, 128, 129 and for drive rollers 130 and 131, The spacer screen 119 is supported by the rollers and moved by means of the drive rollers 130 and 131.

A cleaning and cleaning device is located near the printing frame, which is preferably arranged in a stationary manner opposite the printing device Arranged drying device for the spacer sieve. at 132 shows a container with a support structure for support rollers 133, 134, 135, 136, 137 and 138. These rollers lead the spacer screen 119 so that it passes through a cleaning bath 139 in the container 132, which is a solvent or a suitable solution. The container 132 is also equipped with rotatable cleaning brushes 140, by means of which the spacer sieve 119 can be cleaned. The spacer sieve moves after its cleaning on one to drying fan 141 over.

The arrangement according to Pig. 16 operates essentially in the same way as that of the invention described above Devices. The spacer screen 119 forms an endless loop. It serves to keep the stencil screen 122 at a distance from the damp printing ink on the printing sheet, ^ as

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The conveyor 119 is periodically moved with the aid of the transport rollers 130 and 131 moved to zv.'iscnen a cleaned part of the sieve to arrange the printing press and the print sheet.

The distance sieve can be moved after a certain number of jerks has been carried out. If necessary, the spacer sieve can be used with the help of the same Drive mechanism are operated, by means of which the printed sheet can be transported from one rear station to the next. In this case, the spacer screen 119 would be used after each printing operation Move over a certain distance, and this results in less stringent requirements with regard to the exact cover position luscious compared to the previously printed on the sheet.

.When the sieve 119 is removed from the template, it runs into the cleaning bath 159 »where the brushes 14Ό the printing ink of the i'shops that you des cores. KacLdeir. last Jieb after the iieinigungsübad has left, it runs on the fan 149 over to be dried, so another one Use is possible.

The invention was CtZu ₀ IiOh. your An.vex.jung when printing ve :; r I: iO: -; :: aterial describe ::, dcch te ::. Erl: t, iai the inventions _o eriäie l..e: .riärL: ei: -i; pressure method also with: .printing more cylindrical i'la ^ c.eu or other ge: -: riLn.T.ten 1 "Iacnen appli- lä.: t, v; ob with devices of known type for printing sclcier • Je ^ ei.stänle cc :: ;;;: i -.verden.

ic sei lo :. r.-t, da _: i ^ ai: at äe :. . vrrstehend besjhriecenen Ausfü'irun ^^ 'vcrse idon the veroohieaer.jten Abänderunger .. and modifications.' ei .- s can, without the "rea of i, r-ir ^ quaint to ™ -.. _a ,, _e, - 00 9834/0 20 1

BATH ORIGINAL

Claims (1)

TELKOHAMMADHKHHE t PBOTBCIPiTMT M ( ¹ NCHIN 1A-31870 A T E Ii TA N SPARTS 1. iue ~ rfarben-rSiebdruckverf ahren, characterized in that a first thixotropic printing ink by a first stencil screen is pressed at a first printing station in order to apply a preselected item to the object to be printed Color swatches that apply the item to another The printing station is transported while the applied printing ink is still wet, so that a second stencil is accurate Coincidence with the object is brought to him with a second color sample to be printed while the first mentioned The color sample is still damp, whereby the second stencil is a stencil screen and a screen between this and the one to be printed Comprises arranged object spacer, which consists of a There is material to which the printing ink adheres as little as possible, whereby the thickness of the screen and aie Gfröfte the! .Laböffnungen are chosen so that - a2 the printing ink forming the first ink pattern not in ^ erührur ^ with the neighboring one. »laugh the second stencil corr.:;,t that a second thixotropic printing ink A: is pressed through the second screen to print the object with a:.: second pre-selected color sample, the de ir. first, color sample n.ur.e Cfcn.-iChcart is and is in the exact ^ corner ^ position mix of the.-: first color pattern is, around that the second Siebschablcne and the spacer sieve 0 0 9 8 3 4/0201 - - - -, ORIGlNAL BATHROOM - ^ - 1A-51 870 as v / ground from the printed object while the printing ink is still wet, whereupon the printed object Will get removed. 2. The method according to claim 1, characterized in that it is a spacer sieve is elongated sieve, which is moved periodically, each time a clean part of the spacing sieve in an operating position bring to" 5. The method according to claim 2, characterized in that the spacer sieve periodically by washing is freed from the adhering printing ink, and that the washed-off part is brought into its operating position. 4. The method according to claim 1, characterized in that the spacer sieve used consists of single threads consists. 5. The method according to claim 4, characterized in that the individual threads made of Iiylon or polyesters or polytetrafluoroethylene or stainless steel exist. 6. The method according to claim 1, characterized in that it is the object to be printed is a flat sheet or a piece of sheet material. 7. The method according to claim 1, characterized in that g e k e η η draw t that the object to be printed on becomes a 009834/0201 ^{Bm GfüQMAL} - ^ - 1A-31 870 third printing station is transported and brought into exact register with a third stencil, which is a stencil film and a spacer screen, whereupon the article is printed with a third preselected color pattern while the printing ink of the first and second color swatches is still wet. 8. Device for carrying out a multicolor screen printing process, characterized by first and second means (37,38) for supporting a to be printed Object, means (40) for sequentially transferring the object to be printed to the first and second support means to transport, first and second stencil support means (43, 44) located near the first and the second support means are pivotably mounted, as well as means assigned to the feed means and connected to the feed means can work together to precisely determine their location with respect to each of the template support means. 9. Apparatus according to claim 8, characterized by means for intermittently actuating the feeding means, the position determining means for position determination include serving pins that cooperate with the feeding means » 10. "Device according to claim 9, characterized in that the template support means are pivotally mounted and can be pivoted in coordination with the movement of the feed means to them with respect to the Bringing feed means into the printing position and releasing them again .; to remove this position. 00981 WO 2 01 ^WJLi: " ^{l! IAu} - \ - 1A-31 870 ι * 11. Apparatus according to claim 10, characterized in that the first and the second template support means (43, 44) with a first bzv /. a second template are provided, the second template comprises a frame, and a frame attached to the frame Stencil sieve (10) and a spacer sieve arranged on the frame (14), which is arranged so that it is the stencil screen protects against contact with damp printing ink, which is applied to the object to be printed with the aid of the first stencil has been applied. 12. The device according to claim 11, characterized in that the spacer sieve as an elongated one Sieve is formed and arranged so that it can be moved periodically to each cleaned Siebabnnitt to bring into effect. 13 · Device according to claim 12, characterized by a device for averaging the backfolds from the strainer can be washed off after the thief out has been removed from his company. 14. Performing after opening 11, characterized by the fact that the Acc'junicsieb was made of riinzelfäuen made of nylon or polyester or polytetrafluoroethylene or stainless steel. 15. performing for lure..rühren, a ile ^ ri'arben-Ciecdruckveriui: ^Reiu: <e κ e η η ζ eic :: η et by Vnterstützun; si: .it; tel; 3o) with a first uni a second Trucl: - 0 0 9 8 3rd /. '0 2 0 1 BAD OR] QJNAL - ^ - 1A-31 870 station, supply means (40) for transporting one to printing flat material in such a way that the flat material is fed to the printing stations one after the other, a first and a second screen printing stencil supported so that it is in and out of contact with the material to be printed can be brought, which is located at the first and the second printing station, the second stencil a Comprises spacer screen which is arranged so that there is contact between the second stencil and the still wet Prevents printing ink that has been applied to the material to be printed at the first printing station, means that cooperate with the feeding means to position the feeding means exactly in relation to the printing stations and to bring the templates, as well as painting elements (5, 13) provided on the templates »by means of which a first thixotropic ink pressed through the first stencil and a second thixotropic ink through the second stencil can be. 16. The apparatus according to claim 15 _t characterized by actuating means which enable the feed means to be moved intermittently in order to sequentially arrange the material to be printed at the printing stations, the stencils in coordination with the movement of the feed means in and out of contact with the material to be printed to bring and to move the coating members so that the printing ink is pressed through the stencils while they are in contact with the printing material. 009834/0201 - k- 1A-31 870 It 17. Device for carrying out a multicolor screen printing process, characterized by a screen printing stencil which is mounted so that it can be in and out Can be brought to bear on the material to be printed, an elongated spacer screen which is arranged so that it can be moved between the screen stencil and the material to be printed, with the spacer screen arranged in this way is that there is contact between the screen stencil and the damp printing ink on the material to be printed prevented, as well as means to move the spacer sieve periodically and so in each case a fresh part of the spacer sieve to bring into the operating position. 18. The device according to claim 17 »characterized by cleaning agents to remove printing ink from that part of the spacer screen which has been brought out of alignment with the screen template, 19. Device according to claim 18, characterized in that the cleaning means comprise a cleaning container, furthermore a cleaning liquid, cleaning brushes and means for drying the spacer screen, the means for moving the spacer screen cause the cleaned and dried '-i-'eil of the spacer sieve is brought back into its position between the screen stencil and the material to be printed. 20. Multi-color screen printing process, characterized in that a first printing station at a first thixotropic printing ink pressed through a first stencil screen 0 0 9 8 3 4/0201 bad original. 1A-31870 is selected in order to apply to the object to be printed To apply color pattern that a second stencil is brought into exact register with the object to be printed to print a second color swatch on this while the printing ink forming the first color swatch is still wet, wherein the second stencil has a stencil screen and a spacer screen arranged between this and the object to be printed includes, which the latter consists of a material to which the printing ink adheres as little as possible, the thickness and the mesh size of the spacer sieve are chosen so that the printing ink of the first applied color pattern does not come into contact with the surface of the second stencil screen comes a second thixotropic printing ink through the second sehalone is printed to a second on the object to be printed to print a preselected color pattern, which is close to the first color pattern and is in exact register with the first color sample is located, - and that the second screen stencil and the spacer screen are lifted from the printed object while the print is still damp, after which the printed item is removed 009834/0201