EP0878249A2 - Process for the production of cylindrical substrates - Google Patents

Abstract

The method concerns winding of a continuous strip (6) onto a supporting mandrel surface (5). The strip is unwound from a spool (7) which is mounted so that it can pivot so that the strip winding angle is self adjustable. Strip tension is maintained during the winding process. Preliminary conditioning treatment and coating of the strip with an adhesive takes place between unwinding and winding of the strip. The preliminary treatment stations are mounted on a support wall which is installed to that it can pivot relative to the cylinder surface (5). The cylindrical carrier shell is coated with an integral layer of plastic material.

Description

The invention relates to a method for producing round, metallic Sleeves as coating carriers, on which function-specific, below multilayer layers can be applied, for example compressible Layers for offset printing.

DE 41 40 768 C2 discloses a method for producing an offset printing form a metallic material for a forme cylinder of a printing press. First becomes a plate on the circumference and width of the forme cylinder cut to size and with at least one end face Provide register facilities. Then the plate-shaped blank is opened for printing plate production conventional type coated and exposed, after which the rectangular plate in a welding device by bending into a Bring hollow cylinder shape and clamped there in register. The one on top of the other facing edges of the plate are longitudinally welded together, whereby the welding process is carried out in such a way that a weld seam is formed which is on the top and Underside has a concave shape. In addition to the coating and exposure the plate-shaped blank, the resulting printing form on the Forme cylinders are coated and exposed.

A disadvantage of this manufacturing process is the fact that the length is stretched of the plate-shaped blank, which will later give the diameter, exactly parallel and with a correspondingly high accuracy of significantly better than 1/10 mm tailored. It also causes the introduction of heat when welding causes longitudinal distortion of the material in the weld area. This elongation leads to a ripple on both sides along the weld. When using a sleeve produced in this way leads to the inevitable waviness in the seam area to the fact that air pockets occur, which are under external pressure on the sleeve this migrate, which causes the sleeve to twist on the cylinder.

This results in the need for an additional operation subsequent calibration of such sleeves made according to this procedure has been.

DE 39 08 999 C2 discloses a cylinder body and a method for coating of the cylindrical body. It is proposed to have a cylindrical body like this to be provided with a seamless coating that as a coating material thixotropic multi-component material in the form of a propellant and inhibitor staggered, flowing foam with rotation and feed on the cylindrical body is applied approximately in a spiral. As a sleeve material metallic aluminum or a carbon fiber reinforced plastic is used. The However, the use of plastic sleeves also has disadvantages. For example in view of the considerably lower modulus of elasticity, these have to be increased Wall thickness can be made to be comparable to metallic sleeves To achieve seating strength. High wall thicknesses in turn, for example at the application of heat-treated functional layers higher Exposed to temperature are sensitive to temperature, resulting in loss of Dimensional accuracy and build up high internal stresses.

From EP 0 421 145 A2 and EP 0 715 966 A1 are sleeve-shaped rubber blankets become known, which laterally on blanket cylinders from Have rotary printing presses installed. The rubber coating is on Nickel sleeves applied. The nickel sleeves are electroplated produced. A mother cylinder is inserted into the nickel bath a thin nickel skin, which later after reaching the required wall thickness is rolled from the master cylinder. The nickel sleeve production in this way has an increased power requirement and is extremely time consuming.

Starting from the outlined prior art, the object of the invention based on a manufacturing process for sleeves as cylindrical coating substrates to provide, which avoids the disadvantages of the known solutions.

It was therefore a goal of the development on which the invention is based, sleeves as Coating carriers as economically as various types of sleeves in large quantities have long been produced, such as cardboard tubes, which be wrapped from layers of paper or plastic sleeves, also from Tape material wrapped.

However, as extremely high for this application in the printing industry Accuracies, high rigidity and high strength conditions for such use As previously stated, core material is primarily used as a strip material metallic tape into consideration.

However, the known methods of core winding are not transferable, which is why there are still such sleeves despite the expected There was no advantage either. The procedural problem of sleeves made of metal strip to wrap is very complex.

In order to bond metals securely, it is known that a thorough one is required Cleaning and blasting to enlarge the surface for better Metal glue connection. Both procedures are sufficient in this Use case not out. A so-called is located on metallic tapes Roll skin, essentially these are greases rolled in with high pressure. This Grease-metal connection prevents any secure gluing. Treatment with blasting processes, such as sandblasting, deform the thin strip material however, too strong.

The accuracy and rigidity required require that the tape exactly in front of each other. To achieve that are a highly accurate Winding angle, a very exact, even web tension and a precise plane-parallel tape position, based on the winding surface, necessary.

Another serious problem arises when trimming the length finished wound sleeve the tapered tape ends of the lower Tape position. The peaks result from the position angled axially to the cylinder of the tape, the spiral shape. The adhesive connection of the theoretically infinitely pointed Leaving tape ends cannot cope with a normal cutting pressure.

According to the invention, the object is achieved by the features of patent claim 1 solved.

The advantages that can be achieved with the method according to the invention are more diverse Nature.

The solution according to the invention also permits integrated pretreatment of the Coil material made available in a spool, including the actual processing upstream operations. The tape material can be used in the pendulum storage be attached and the necessary cleaning and conditioning of the belt takes place during the processing of the strip material. The generation of a Preloading in the strip material allows high precision of the Rewinding process with the most precise joint formation. The pendulum of the Storage of the strip material allows a winding angle specification to be dispensed with - Rather, it sets itself up automatically.

Further refinements of the idea on which the invention is based lie in ongoing cleaning of the strip material during unwinding perform. Degreasing and dedusting can, for example done electrolytically. In an appropriately designed cleaning station the strip material can also be etched with pole change. This creates a micro-roughness of the surface of the strip material, so that in downstream process steps of the method according to the invention can achieve excellent adhesive results.

After the strip material has been cleaned, it is dried in one Drying station. The strip material can then be conditioned. With In the present context, conditioning is a surface treatment of the strip material is meant, such as a surface treatment with a primer. By means of the flat application of a primer, for example Surface adhesion of the adhesive to the tape material with simultaneous tape cleaning be improved. A further improvement in the adhesive bond can instead of the primer, by enriching the surface of the tape material with Non-ferrous ions, such as copper ions, are made. These enrichments are missing in high-alloy steels and stainless steels. They don't just improve that Hardening of anaerobic adhesive systems considerably, but above all that Metal glue connection. An ion enrichment of the strip material can be caused by The strip material is brushed with copper or brass brushes; also a A primer application for copper ion enrichment would be conceivable.

According to the method, one side of the strip material is treated after the treatment a deflection of the strip material, so that the remaining side can be cleaned and pretreated. To do this are appropriate Cleaning station, drying and pretreatment also for this side of the Band material provided.

For the edge trimming of the wound sleeves are the supporting surface assigned to the winding cylinder trimming devices. these can For example, cutting tools such as milling cutters or as optical devices such as lasers. Are lasers as edging devices provided, the edge of the layers can be trimmed and all around at the same time be welded.

The tensioning of the strip material is maintained by an im Conveyor path of the belt material arranged pull and brake roller around which the Tape material is looped over a relatively large circumferential area. On a The side of such a type of pre-tensioned tape material is then applied, for example an anaerobic adhesive system.

An apparatus for performing the method according to the invention provides that Housing or support wall for the pretreatment stations, the storage of the Material spool, the pull and brake roller and the adhesive application station relative to To design winding cylinder pendulum, so that by the feed and the Winding speed results in a self-adjustment of the winding angle.

The invention will be explained in more detail below with reference to a drawing.

Fig.1

eine Draufsicht auf eine schematisch skizzierte Wickelstation,

Fig.2

eine Wickelstation mit integrierter Wickelmaterialvorbehandlung,

Fig.3

ein Materialcoil,

Fig.4

eine Grundwicklung aus einer ersten Wickellage,

Fig.5

die Darstellung einer Wickelfolge bei zweilagiger Wicklung und

Fig.6

eine versetzte Wicklung zweier Wickellagen.

It shows:

Fig. 1

a plan view of a schematically outlined winding station,

Fig. 2

a winding station with integrated winding material pretreatment,

Fig. 3

a material coil,

Fig. 4

a basic winding from a first winding layer,

Fig. 5

the representation of a winding sequence with two-layer winding and

Fig. 6

an offset winding of two winding layers.

Fig. 1 is an illustration of a winding station only schematically outlined here.

The winding station 1 comprises a winding cylinder 5, on both sides in two Tailstocks 3, 4 is rotatably mounted. Below the winding cylinder 5 is in this Top view to recognize the machine frame 2, on which a material spool 7, which feeds a narrow strip material 6, is arranged to be movable. It is recognizable that the material spool 7, which is pivoted, in a winding angle to Winding cylinder 5 is aligned. This alignment takes place automatically by default of the winding angle during the feed of the material spool 7 in the direction of the arrow. During the winding process, a first one forms on the winding cylinder 5 Layer 29 of strip material 6, which at joints 30 without joints and butts together without overlap. The end faces of the winding cylinder 5 are Devices 9,10 assigned to the edge trimming of the winding layers. It can are milling devices or optical devices such as lasers, with the help of the end areas of the core layers to be wound are edged. When using lasers on the end faces could for example, the resulting tape tip can be fixed. In addition to the fixation the tape outlet tip can be trimmed simultaneously with the lasers of the entire edge and its all-round welding. In order to can use the end faces of the single or multi-layer sleeve made of tape material stiffened and better secured against accidental damage.

To maintain a constant pre-tension of the strip material 6 can the winding coil 7, a stepper motor 36 may be attached, with the help of which Tape material 6 is held under tension. The winding cylinder 5 rotates in Winding direction 11 and winds the narrow contained on the material spool 7 Tape material 6 constantly from this. It should also be mentioned that on the Machine frame 2 guides 15 are available, in which the winding Tape material supply 7 during the feed when winding parallel to the axis of the Winding cylinder 5 can be carried.

2 shows a winding station for carrying out the method according to the invention, in which the pre-treatment of the strip material to be wound is already taking place can.

The winding station 1 comprises a support wall 16 in which, among other things, a Material spool 7 is rotatably mounted, the stock of narrow strip material 6th records. The narrow strip material 6 becomes constant from the supply reel 7 processed, and runs after a first redirection to a Material cleaning station 18 on. The strip material 6 is cleaned there. The Cleaning of the band material 6 is necessary to keep dust, grease or other Remove deposits from the surface of the slowly unwinding tape 6. This cleaning station 18 initially only acts on one side of the strip material 6 a, which then passes through a first drying station 19, from which the Strip material 6 reaches a primer station 20.

There, depending on the strip material 6 to be processed, to ensure a later perfect adhesive connection a material that supports the adhesive bond be applied. This is because anaerobic systems are used as glue can be provided. These air-hardening systems assume the presence of non-ferrous (Ne) ions. However, these are missing in high-alloy steels (stainless steels), so that these steels when used must be pretreated. Such pretreatment can be carried out, for example, with Primers happen, or by wrapping the unwrapped stainless steel band with copper or Brass brushes are brushed before gluing. This can be done in one accordingly modified primer station 20 happen in which then instead of one Material application by rollers or brushes, brushes with copper or Brass bristles can be arranged around the band material 6 with sufficient Enrich Ne ions.

As can also be seen from FIG. 2, all pretreatment stations are such as cleaning, drying and conditioning for the top and bottom of the Tape material 6 taken from the support wall, which is relative to the supporting Surface of the winding cylinder 5 is pivoted. From set The winding speed and the feed of the support turns up Winding angle α automatically without pre-settings being necessary. More specifically, arises due to the tension in the belt - caused by the tension and Brake roller 24 - and the feed and the speed of the winding angle α. This requires a precise coordination of speed and feed, which but can be calculated with high accuracy. When using a high resolving stepper motor 36 with encoder this is not a problem Pendulum 17 of the support wall is given by the suspensions 17.

The strip material 6 cleaned and conditioned on its underside is on the Deflection 37 turned by about 180 °, so that the remaining side of the Belt material is accessible for cleaning and pretreatment. The Cleaning station 18 can also be designed so that by polarization and Etching the surface of the strip material 6 is a micro roughness of the surface is brought about in order after the application of an anaerobic adhesive to the Glue station 22 to achieve an improved adhesive effect. After Cleaning station 18 passes the tape material 6 on both sides of the Belt material 6 acting drying station 21, to which there is another Pre-treatment station 20 connects, their function already above was written.

The strip material 6 then passes through a drying station 19 and is now Conditioned on both sides for winding. Which are in the path of the tape material 6 subsequent traction and brake roller 24 is wrapped at about 270 °, whereby immediately before applying the adhesive at 22 the tape material 6 under Bias is maintained. The adhesive is applied in the adhesive station 22 pre-tensioned strip material 6 before it is wound up. A tape separator and Clamping station 23 is also provided in order to pre-tension the strip material 6 maintain. The tape material 6 is to be clamped temporarily after one or multilayer sleeve on the supporting surface 5 is completed or is finished by means of the edging device 9, 10.

Fig. 3 shows a material coil.

A stock of narrow strip material 6 - an extremely thin rolled steel, or Stainless steel sheet - is wound into a coil 7. The strip material 6 has one Material width 8 between 10 and 100 mm, its thickness 25 is about 0.05 mm. The coil 7 is rotatable about its axis 26 and is only shown schematically here.

Fig. 4 shows a basic winding from a first winding layer.

The narrow strip material 6 is wound around a winding cylinder 5 such that a first layer 29 is formed on the outer surface of the winding cylinder 5. The narrow strip material 6 is inclined by the winding angle α, so that the individual windings of the first layer 29 without the formation of joints and Apply to each other without overlap. The edges 27, 28 of the narrow Tape material 6 form joints 30 of the first layer 29 at which they meet bump. The first layer 29 produced by means of the method according to the invention is accordingly oriented slightly diagonally on the winding cylinder 5 and extends over the entire width of the winding cylinder 5. The resulting per winding revolution Sleeve strip forms with the previous one already wound Sleeve strips joints 30. The exact formation of these joints without Joint formation and without material overlap is for the usability of the wrapped sleeves crucial. Would it be at the joints 30 to form joints, the rigidity of the wound base sleeve would not be given. A structure of an air cushion for widening the sleeve in the circumferential direction would be very difficult because of the leaks at the joints or not feasible at all. An overlap of the narrow band material on the Butt joints 30 would nullify the required accuracy of the sleeve to be manufactured do.

Fig. 5 shows the representation of a winding sequence with multi-layer winding.

The first layer 29 of the narrow strip material 6, which is the base layer of the Forms base sleeve is perpendicular to the first winding angle α in the winding direction 11 Normals 31 applied to the winding cylinder axis. The edges 27, 28 each form said abutting points 30. Has the narrow strip material 6 according to the Method according to the invention previously passes through an adhesive station 22 at which a Adhesive was applied, so there can be another layer provided with adhesive on one side of the narrow strip material 6 are applied to the first layer 29. It forms on the first layer 29 there is the further layer 32. As can be seen in FIG. 5 the winding of the further layer 32 with one for winding the first layer 29 opposite slope 35 takes place. In the further layer 32 there are joints 33 trained, which are also designed without joints and without overlapping. The Butt joints 33 cross the butt joints 30 of the previously applied layer 29 and thus contribute to an increase in the rigidity of a multilayer sleeve composite.

Instead of the bidirectional winding shown in FIG. 5, a 6 are used.

Here - to illustrate the simplest case - a band 6 of the same width is used layer 29 already underneath offset by half of the strip material 6 wrapped. First, we also the first layer 29 with the formation of joints 30 Winding angle α wound on the winding cylinder 5, then the other Layer 32 wound so that it by half the width of the tape material 6 the first layer 29 comes up. Consequently, they are in such a winding resulting joints 33 not over the joints 30 of the first layer 29, but offset by half of the narrow strip material 6. This leaves achieve a much higher buckling stiffness of multi-layer sleeves.

Reference list

1

Changing station

2nd

Machine frame

3rd

Tailstock

4th

Tailstock

5

Winding cylinder

6

Tape material

7

Material spool

8th

Material width

9

Edge trimming station

10th

Edge trimming station

11

Winding sense

12th

Beginning of tape material

13

Joint

14

Feed direction

15

guides

16

Support wall

17th

rotatable suspension

18th

Belt cleaning station

19th

first drying station

20th

Primer station

21

second drying station

22

Glue station

23

Belt cutting and belt clamping station

24th

Pull and brake roller

25th

Material thickness

26

Unwinding axis

27

Edge

28

Edge

29

first layer

30th

Joints

31

Normal to the cylinder axis

32

further location

33

Joints

34

first slope

35

opposite slope

36

Stepper motor with encoder

37

Redirection

Claims (24)

Process for winding a continuous material on a supporting surface of a winding mandrel, characterized by the following process steps: the processing of a material (6) from a material supply (7) and its winding up on a supporting surface (5), the self-setting of a winding angle α, which enables pendulum mounting (17) of the material (6, 7) during the feed, the maintenance of the tension during the winding of the material (6), the cleaning and conditioning pretreatment of the material (6) between processing and winding up and the coating with adhesive that takes place between processing and winding. Method according to claim 1,
characterized,
that the cleaning of the material (6) takes place continuously during the processing of the same. Method according to claim 2,
characterized,
that the cleaning of the strip material (6) takes place electrolytically. Method according to claim 2,
characterized,
that a roughness is etched into the strip material (6) in a cleaning station (18). Method according to claim 1,
characterized,
that the strip material (6) passes through a first drying station (19) after passage through the cleaning station (18). Method according to claim 1,
characterized,
that the strip material (6) is conditioned after passage through the first drying station (19). Method according to claim 6,
characterized,
that the strip material (6) passes a conditioning station (20) for surface treatment. Method according to claim 6,
characterized,
that the surface of the tape material (6) is coated with a primer which improves adhesion. Method according to claim 6,
characterized,
that the surface of the strip material (6) is enriched with non-ferrous ions. Method according to claim 9,
characterized,
that the non-ferrous ions are applied by means of brushes in the conditioning station (20). A method according to claim 10,
characterized,
that the brushes are made of copper. A method according to claim 10,
characterized,
that the brushes are made of brass. Method according to claim 6,
characterized,
that the non-ferrous ions are applied in the conditioning station (20) by means of liquid primers. Method according to claim 6,
characterized,
that a deflection (37) is provided so that the further side of the strip material (6) can be cleaned and pretreated. Method according to claim 1,
characterized,
that the end faces of strip material (6) made from layers (29, 32) are provided with trimming devices (9, 10). A method according to claim 15,
characterized,
that cutting tools are provided as trimming devices. A method according to claim 15,
characterized,
that lasers are provided as trimming devices. A method according to claim 15,
characterized,
that the edge of the layers (29, 32) is simultaneously trimmed and welded all around by means of the trimming devices (9, 10). Method according to claim 1,
characterized,
that the tape material (6) is held under tension by wrapping a tension and brake roller (24) during winding onto the supporting surface (5). Method according to claim 1,
characterized,
that before the winding of the strip material (6) conditioned in the pretreatment stations (18, 19, 20, 21) is applied to a supporting surface (5). A method according to claim 21,
characterized,
that an anaerobic adhesive system is applied to the tape material (6) as an adhesive. Device for carrying out the method according to claim 1,
characterized,
that the support wall (16) receiving the strip path of the strip material (6) with pretreatment stations (18, 19, 20, 21, 22, 23,) is mounted in an oscillating manner relative to the winding cylinder (5). Device according to claim 23,
characterized,
that the support wall (16) is pivotally mounted. Cylindrical carrier sleeve for rotary printing presses with one closed jacket coating made of plastic, especially after one of claims 1 to 21 was produced.

Images