Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
  • D21F11/006—Making patterned paper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F15/00—Screen printers
  • B41F15/08—Machines
  • B41F15/0831—Machines for printing webs
  • B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F15/00—Screen printers
  • B41F15/08—Machines
  • B41F15/0868—Machines for printing on filamentary articles
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/44—Watermarking devices
• • 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
  • B41M1/12—Stencil printing; Silk-screen printing

Definitions

• the invention is based on an apparatus and a method for producing a pattern on a covering for a machine for producing sheet material, such as e.g. Paper, cardboard, tissue or a nonwoven product and of such a fabric.
• sheet material such as e.g. Paper, cardboard, tissue or a nonwoven product and of such a fabric.
• Such a fabric e.g. can be used as a forming fabric in a paper machine, is known from EP 1 690 981 A1.
• a pattern of polymer material is applied to a support structure formed, for example, as a fabric in a screen printing process by means of a rotary screen.
• the pattern can be applied to the support fabric with substantially any desired configuration so as to generate a surface structuring on one side of the papermachine fabric produced in this way, which is evident in papermaking with a corresponding topography in the produced paper.
• EP 1 690 982 A1 discloses a method for applying a pattern to a papermachine fabric, in which a polymer material forming the pattern is dispensed from an extrusion head in an extrusion process and thus applied to the surface of, for example, a fabric-like support structure.
• the extrusion head can be moved as desired over the surface of the support structure.
• a covering for a paper machine in which a basic structure is printed several times with a polymer structure, wherein a first polymer layer has a lattice-like structure and a second polymer layer largely occupies the recesses in the lattice-like first layer and thereby the first layer partially overlaid.
• a continuous papermachine woven papermachine fabric having a three-dimensional weave pattern having a structure having height differences of 0.2 mm or more in the z direction.
• the fabric has decorative elements surrounded by highlight areas which are surrounded by the three-dimensional weave pattern of the fabric and have a structure which has a lower height than the structure of the weave pattern.
• the weave pattern represents a textured background surface which is the predominant contact surface of the fabric to the paper web.
• a disadvantage of known clothing and its production method is in particular that although combinations of patterns by appropriate production of the basic structure and subsequent printing are possible, but this is very expensive.
• Multiple printing operations on a structured or unstructured basic structure are known as mentioned above, but have the same disadvantage.
• the latter fabrics are subject to multiple processing, which requires high production costs and a high amount of time. It is therefore an object of the present invention to provide a method and a device with which in a simple and thus faster and more cost-effective manner different patterns can be applied simultaneously to the surface of a fabric, so that not several steps to produce a pattern are necessary. This can save processing time and the production of such fabrics can be made more economical.
• the device comprises at least one rotary screen, the cylindrical surface of which has a first pattern component defining perforation pattern and in which pressed to produce the first pattern component on a surface of the fabric material in the liquid or pasty state through the perforations of the lateral surface of the rotary screen and is deposited on the surface of the fabric, while the rotary screen, rotating several times about its longitudinal axis, rolls on the surface of the fabric in at least one at least once on the surface of the fabric continuously circulating path.
• At least one means indirectly or directly connected to the rotary screen is provided for the synchronous and / or simultaneous generation of a second pattern component.
• the control of the pattern generation takes place via a Nachêtrsystem. Due to the synchronous and / or simultaneous application of the two sample components can be done very quickly and time-saving production of the fabric in only one processing step.
• a suitable design of the rotary screen and the associated at least one means for producing the second pattern component a large variety of patterns is available, which can be produced in a simple manner and without undesirable offsets on any width of clothing.
• the at least one means for synchronous and / or simultaneous generation of the second pattern component may be in the form of at least one pattern ring.
• the at least one pattern ring can be arranged terminally on the rotary screen and firmly connected to the rotary screen. Thereby the pattern components are rigidly connected, avoiding offsets in the pattern.
• a pattern ring is present per end of the rotary screen.
• a plurality of pattern rings are present. These may be provided individually or in a plurality at one or both ends of the rotary screen.
• At least one surface shape in particular a groove
• the groove can be provided in the at least one pattern ring, which groove extends circumferentially on a surface of the pattern ring.
• the groove may have a straight, curved, wavy or zigzag-like shape.
• the means for generating the second pattern component may comprise a pattern recognition device, by means of which the first pattern component can be detected.
• the second pattern component can be applied in relation to the first pattern component, which nevertheless takes place in only one processing step without the clothing having to undergo a second separate printing process.
• the post-rotor system is indirectly or directly coupled to the at least one means for synchronous and / or simultaneous generation of the second pattern component.
• the shape of the at least one pattern ring can be mechanically or optically traced by the post-rotor system.
• an extrusion head can be integrated in the post-rotor system, which has one or more nozzles through which material can be applied to the surface of the clothing.
• the post-rotor system can have a control, by which a pattern recognition and an activation of the extrusion head takes place.
• the first pattern component consists of a first material and the second pattern component of a second material, wherein the first and the second material may be the same or different. If different requirements are placed on the sample components, it may be advantageous if one of the materials is harder or softer, more abrasion resistant, smoother or rougher than the other.
• a cross-sectional shape of the first pattern component and a cross-sectional shape of the second pattern component may be the same or different.
• personalized motifs for example, can be strongly and clearly highlighted and surrounded by a softer drawn and less prominent background.
• the material may contain or consist of the sample components: amide, ester, silicone, polyurethane.
• the dimensioning of the second pattern component can be at a height of 0 to 10 mm, in a width of 0.1 to 10 mm and in any desired length.
• the lines of the second pattern component may be continuous or interrupted as desired.
• Fig. 2 is a highly schematic representation of a rotary screen for
• Fig. 3 is a schematic perspective view of a pattern ring for
• Fig. 1 is a plan view of a fabric 1 is shown in a highly schematic view, which is particularly suitable for use in a machine for producing a fibrous web such as a paper, board or tissue machine and in a machine for producing a nonwoven product.
• a plurality of clothing 1 are usually provided, which fulfill different tasks depending on their position.
• a covering 1 serves as a forming fabric and thus the initial dewatering of the fiber suspension sprayed onto the forming fabric or injected in a twin-wire former between two forming fabrics and the orientation of the fibers in the young fiber web.
• coverings 1 are provided as press felts for further drainage, which should have a high water absorption capacity, good resilience, smooth contact surfaces to the fiber web and low tendency to rewet.
• the fabric 1 is often designed as a dryer fabric in the form of a spiral structure and is characterized by a high temperature resistance with high vapor permeability.
• Cloths 1 are also often used to introduce a decorative pattern in the fibrous web, which represents today's standard, especially in the field of sanitary papers. The patterns have both aesthetic and the properties of the paper web influencing characteristics, such as the grip of the surface, the layer thickness, etc.
• the individual features are often designed so that a decorative, often personalized pattern is desirable, but this can not meet the demands made on the physical properties of the fiber web. It was thus previously necessary to subject the fabric 1 at least two separate steps in order to produce at least two patterns in / on the respective fabric.
• a three-dimensional structure in the production of the basic structure of the covering 1 and then to superimpose this structure by a pattern, for example printed on at least one surface of the covering 1.
• the structure of the basic structure can be produced by fixed weave patterns, while the printed pattern can be printed e.g. is applied by a screen printing process.
• the weaving of such basic structures is a very complex process, which is also still very limited in its variety of patterns. Due to the nature of weaving, only the machine direction, the cross-machine direction and diagonals can be included in the pattern, an arbitrary pattern choice is not possible.
• the multiple printing for example by screen printing and subsequent printing by means of a nozzle extrusion device are known and possible.
• it can take a very long time and / or be very costly to produce a covering 1 by means of such multi-stage methods.
• it is therefore proposed to apply two pattern groups A and B synchronously and / or simultaneously using only one device on the fabric 1, so that a regular or irregular pattern of two different components with a personalized motif and surrounding the subject background structure results, without elaborate weaving processes or multiple printing steps are necessary.
• any fabrics such as fabrics, scrims, knitted fabrics, spiral screens, spiral structures and films are printable.
• a personalized pattern component A represented by the faces is formed against a background of line-shaped structures forming a zigzag pattern B in the embodiment.
• Both sample components A and B are made of a material such as amides, polyurethane, silicone, Esther or other suitable pressure or extrudable processable materials, which is discharged from appropriately shaped extrusion devices on the base substrate of the fabric 1.
• the pattern component A may consist of the same or of a different material as the pattern component B.
• the choice of materials can be made according to the requirements of stability, dimensioning, smoothness, elasticity, gas and water permeability etc. of the individual sample components.
• pattern components A and B for example, personalized pattern components A such as company logos, lettering, pictorial representations of arbitrary objects, etc. with pattern components B of straight lines, wavy lines, zigzag lines, broken lines or dots.
• the material application of the pattern components A and B is precisely controlled so that the personalized motif A is framed by the background pattern B.
• the base substrate may be in the form of an endless belt or as a flat structure. Accordingly, it must be held or clamped by a suitable device in order to be able to attach the patterns A and B to it.
• a suitable device for example, if the base substrate is in the form of an endless belt, it may be held and tensioned by a combination of two or more rollers.
• the rollers can be rotatably mounted and provided with a drive.
• the order of the sample components A and B is carried out according to a preferred embodiment of the invention using a rotary screen 2, which is shown in a highly schematic manner in FIG. Such rotary screens 2 are already known from the prior art.
• the rotary screen 2 unrolls on the base substrate, exposing material to the surface of the base substrate through the openings. If the base substrate is substantially wider than the width of the rotary screen 2, the rotary screen 2 can be guided in a spiral path over several revolutions across the entire surface of the base substrate.
• the sizing of the rotary screen 2 and a suitable control system ensure that the pattern component A thus produced remains free of offsets and overlaps.
• the second pattern component B or background pattern is applied to the base substrate in the embodiment by using a guide system with pattern rings 3. These are arranged terminally on the rotary screen 2.
• This at least one pattern ring 3 has the characteristic shape of the background pattern B, as shown in FIG. 3.
• the line geometry is determined by a groove 4 in the pattern ring 3.
• the groove 4 can be introduced, for example, by milling or laser machining in the pattern ring 3.
• the material for generating the background pattern B is supplied to the at least one pattern ring 3 by a suitable feed system and deposited on the base structure.
• a suitable feed system supplied to the at least one pattern ring 3 by a suitable feed system and deposited on the base structure.
• One of the great advantages of this arrangement is that the pattern-generating structures for motif A and background B are firmly connected to each other. This allows a high degree of control for the accuracy of the pattern job and also allows complex combinations. As a result, motif A and background B are always accurately arranged and delimited, subject A is framed cleanly by background B, patterns A and B are not overlapped by unwanted accidental offsets when applying material.
• a suitable control system can be used to automatically cause the beginning and end of the background pattern B, thus ensuring a clean separation of subject A and background B.
• motif A and background B touch, cut or cover, depending on which properties are desired in terms of design and technical requirements of the sample components A and B.
• a follower system which can operate mechanically or optically, can be used to follow the shape of the at least one pattern ring 3, for example the groove 4.
• An extrusion head which may have one or more nozzles, is integrated in the post-rotor system and is controlled by suitable control means so that the material application begins and ends at the desired location.
• the one or more nozzles of the extrusion head may be turned on or off so as to allow or inhibit the dispensing of material. This is synchronized with the position of the subject A in the rotary screen 2.
• the finished fabric 1 contains after complete printing a simultaneously produced pattern of the components A and B.
• Typical dimensions of the pattern component B can be selected as described below:
• Length any combinations of line lengths (from very short or punctiform to very long or continuous) over the circumferential length of the base substrate are conceivable and possible (in the case of an endless belt).
• the lines can be continuous if no large-scale motif A is provided.
• the final result can therefore be any combination of continuous and broken lines B and areas with and without motif A.
• control of the beginning and end of the background pattern B may be pneumatically, hydraulically, electrically controlled, or may include a suitable combination of the foregoing.
• an image recognition device indirectly or directly connected to the rotary screen 2, which software-controlled recognizes the pattern component A and controls the application of the pattern component B by suitable coupling with the post-cursor system.
• the detection can be done by optical or mechanical, such as tactile sensors.
• a suitable control and coupling must then be provided between the rotary screen 2, image recognition device and Nachiquersystem.
• the image recognition device can furthermore also be an integral part of the post-cursor system.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Decoration Of Textiles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50478394

Family Applications (1)

Country Status (4)

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Family Cites Families (23)

• 2014
  • 2014-04-09 CN CN201480020402.6A patent/CN105164336B/zh active Active
  • 2014-04-09 US US14/784,229 patent/US20160060811A1/en not_active Abandoned
  • 2014-04-09 WO PCT/EP2014/057127 patent/WO2014166982A2/de active Application Filing
  • 2014-04-09 EP EP14716563.3A patent/EP2984225A2/de not_active Withdrawn
• 2017
  • 2017-07-28 US US15/662,481 patent/US20200087858A9/en not_active Abandoned

Non-Patent Citations (1)

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