DE112006000264T5 - Process for producing a coated roll, in particular for printing and forming, roll produced by this process - Google Patents

Abstract

Process for producing a covered roll, comprising a tube (10) and two lugs (14) connected to the tube (10), characterized in that it comprises the following sequence of steps:
- manufacture of the tube (10),
Creating at least one vent hole (28) in each lug intended to guide outward moving air moving between the pipe and said lug,
Inserting the thus provided lugs (14) for connection to the tube to form a roller,
Applying a coating (22) of an elastomeric material to the roller,
- Polymerization under heat of the coating with simultaneous venting through the at least one vent hole and
- Surface treatment of the coating.

Description

The The present invention relates to a process for the preparation of a coated roller, in particular a roller for use in a printing or forming machine.

The The invention also relates to those produced by this process Roller.

In paper printing machines and plastic forming machines, in heatset or newspaper printing, for example, with elastomers used rolls whose task is to coat a carrier, two carrier to conceal or transfer ink or water to the carrier, These rollers can also fulfill other tasks.

These Rollers need necessarily have a high rigidity, so that by the very fast Rotation and the contact forces deformations are kept to a minimum.

These Rollers are generally made using different techniques manufactured and in particular by continuous drawing of pipes, using carbon fibers and a resin matrix for this purpose.

By These pipes are the deformations under load very low, with this for both the lack of clarity as well the deflection applies.

Thereby become very satisfactory, especially at high speed printing qualities reached.

For the assembly on the machine these pipes are mounted on metal lugs, which in turn are intended to be with the bearings of the printing press together.

These approaches are inserted and glued to both ends of the tube, generally using an epoxy adhesive.

Everyone Approach, in a known manner, a part that extends into the tube interior extends while a Covenant on the annular section of the pipe comes into abutment so that the neck is held, comes into play and ensures the continuity of the outer surface.

The Roller produced in this way has all the required mechanical Features on.

Some These rolls are then coated with a layer of elastomeric material. This Material has a hardness on that for the printing or for the desired Task, such as coating or lamination, is suitable. The texture of the coating in itself depends on the type of printing. The pressing on the to be printed carrier must be with a suitable pressure.

in the Offset printing, for example, does not allow the printing plate to open directly to print the paper, leaving a blanket called transfer cylinder is used, which receives the ink and transfers it to the paper. This Blanket is a roller coated with an elastomeric layer.

The Rolls are also made with a layer of a natural one or artificial Elastomer coated, which subsequently vulcanized hot depending on the type of polymer or polymerized, whereby the crosslinking of the polymer and the connection of this polymer takes place with this receiving pipe surface.

This Operation is carried out under pressure and at a temperature of about 150 ° C, wherein the entire roller, that is the pipe, the lugs and the coating to be placed in an autoclave.

To the vulcanization or polymerization of the coating with the roller Their elastomer layer is ground to give the outer surface of the coating a precise straightness and cylindrical shape as well as to give a very precise diameter. With this grinding process can also be a satisfactory surface finish be achieved.

During the Vulcanization of the elastomer from which the coating consists is made it is clear that one or more bubbles are caused by the increase in temperature at the interface between the outside the roller and the inside of the elastomer coating form.

such Bubbles are with the desired precision, which generally depends on the roller, not reconcilable and can not later be eliminated because only the outside of the coating is sanded. In addition, this area does not have the same hardness, so that the surface is not homogeneous.

These Bubbles can come from the glue, when mounting the lugs Including air, wherein for the Eliminate this accumulation of air yet no solution has been found.

Thus, it appears that the expanding air migrates into the glue joint upon heating, with this air passing between the tube and the tube Bundle penetrates and accumulates under the elastomer. This adheres firmly to the pipe, but can deform due to its remaining elasticity, so that there can accumulate air. Each bubble then stops the connection of this coating to the pipe in that area.

Therefore For example, a roll with such a defect is unacceptable. It stays only, the coating to remove, re-coat the roller and check that the blister error does not reappear. It is understood that the final cost of the coating are very high. It should also be noted that some approaches without Adhesive force-locking In this case, this migration of air with Bubble formation can also occur, with the way the air travels, between at least one approach and the cylinder is identical.

Therefore beats the present invention is a solution before, which avoided the formation of bubbles and the migration of air can be eliminated. The invention proposes also a roller, which allows the implementation of this method.

Of the For the sake of simplicity, in the following only one bubble will ever be used Be speech, even if there are multiple bubbles.

Now The invention is by way of a particular, non-limiting Understanding embodiment explained in more detail with reference to the accompanying drawings. It demonstrate:

1 a schematic sectional view of a coated roller of the prior art with a blister error,

2 a schematic sectional view of an embodiment of a roller which prevents the formation of bubbles.

In 1 is a roller 10 represented, for example, by continuous drawing of carbon fibers and a resin matrix.

This tube is cut to the desired length and has clear edges 12 ,

This tube takes at both ends in each case an approach 14 on. Each approach includes a penetrating part 16 , which is insertable into the tube, and an outer part 18 which forms a collar and is engageable against the cutting surface of the tube.

The penetrating part 16 is with glue 20 provided so that each approach is irreversibly connected to the inner wall of the tube.

This tube takes an elastomeric coating 22 which is to be polymerized hot, so that the crosslinking in the mass takes place quickly and homogeneously.

In this hot polymerization, air passes through the adhesive bond and collects at random to form bubbles, in the present case merely a bubble to simplify the drawing 24 was presented.

These Bubble is at the interface between the pipe and the coating arranged and remains even after the curing of the coating, so it for a final Air entrapment comes.

In 2 an implementation of the method according to the invention is shown.

This Namely method exists in providing at least one way of discharging the migratory air, this way being annular across from begins the approach and opens on the outer surface of the roller.

In this 2 was in the outer part 18 , which forms the collar of a respective approach, an annular groove 26 brought in. In particular, this groove was arranged at the angle that passes through the penetrating part 16 the approach and the outer, the federal part forming part 18 is formed.

This groove 26 is opposite the adhesive and opposite the cut surface of the tube 10 and is on the way, where the air wanders.

On the side surface of each approach is at least one vent hole 28 introduced, over which the groove 26 communicates with the exterior of the roller. Preferably, a plurality of ventilation holes are distributed at regular intervals, so that the way to dissipate the air is shortened.

In addition, There should be a blockage of one of the ventilation holes, for example if there is too much glue or if it begins to flow then it will remain even more available Ventilation holes, the remove the air can.

These Groove may also be wholly or partly in the tube, at the cut surface thereof, be provided.

Thus, when the heating process for polymerization takes place, the expanding air is directed into the groove acting as a collector, and any overpressure is dissipated through the ventilation via the ventilation holes. Therefore, the air does not migrate to the interface, so jegli Overpressure under the coating, which could form a bubble, is avoided.

apart from this preferred embodiment it is found that the main errors are eliminated even then can be if no collecting groove is provided, namely simply by at least a ventilation hole is in the lot to approach.

are the approaches not glued, so can with the method that consists in a To provide escape route on the way, on which the air wanders, the Blistering below the coating be avoided.

Finally are in the illustrated preferred embodiment, the ventilation holes for outside the roller directed perpendicular to the side surface, wherein such a Ventilation hole too could be directed inside the roller, that is to the inside of the approach, if this is hollow.

In In this case, the migrating air escapes by venting, wherein only the execution another is, the result remains the same.

Summary

• – Herstellen des Rohres (10),
• – Erstellen mindestens eines Lüftungsloches (28) in jedem Ansatz, welches dazu bestimmt ist, wandernde Luft, die sich zwischen dem Rohr und diesem Ansatz bewegt, nach außen zu führen
• – Einführen der auf diese Weise bereitgestellten Ansätze (14) zur Verbindung mit dem Rohr, um eine Walze zu bilden,
• – Aufbringen eines Überzuges (22) aus einem Elastomermaterial auf die Walze,
• – Polymerisation unter Hitze des Überzuges mit gleichzeitiger Entlüftung über das mindestens eine Lüftungsloch und
• – Oberflächenbehandlung des Überzugs.

The invention relates to a process for producing a covered roll comprising a pipe ( 10 ) and two with the pipe ( 10 ) related approaches ( 14 ), characterized in that it comprises the following sequence of steps:

• - manufacture of the tube ( 10 )
• - Create at least one ventilation hole ( 28 ) in each approach intended to guide outward moving air moving between the pipe and this approach
• - Introduce the approaches provided in this way ( 14 ) for connection to the tube to form a roller,
• Application of a coating ( 22 ) of an elastomeric material on the roller,
• - Polymerization under heat of the coating with simultaneous venting through the at least one vent hole and
• - Surface treatment of the coating.

Claims (10)

Process for producing a covered roll comprising a pipe ( 10 ) and two with the pipe ( 10 ) related approaches ( 14 ), characterized in that it comprises the following sequence of steps: - manufacture of the tube ( 10 ), - creating at least one ventilation hole ( 28 ) in any approach designed to evacuate migratory air moving between the tube and this approach, - introducing the approaches provided in this way ( 14 ) for connection to the tube to form a roller, - application of a coating ( 22 ) of an elastomeric material on the roll, - polymerization under heat of the coating with simultaneous venting through the at least one vent hole and - surface treatment of the coating. Process for producing a covered roll according to claim 1, characterized in that at least one annular groove ( 26 ) is introduced in the tube and / or in the approach, wherein the groove with the vent hole ( 28 ). Process for producing a covered roll according to claim 1 or 2, characterized in that each ventilation hole ( 28 ) is arranged so that it on the side surface of the neck ( 14 ), in which it is incorporated, opens. Process for manufacturing a covered roll according to claim 1 or 2, characterized in that, if the lug is hollow, each vent hole ( 28 ) is arranged so that it opens on the inside of each approach. Covered roller, in particular for a printing press, produced according to the teaching of the method according to claims 1 to 4, characterized in that it comprises: - a tube ( 10 ), - two approaches connected to the tube ( 14 ), and - at least one ventilation hole ( 28 ) in each approach to guide the moving air that moves between the pipe and this approach to the outside. Covered roller according to claim 5, characterized in that each approach ( 14 ) at least one groove ( 26 ) which is provided to communicate with the at least one ventilation hole ( 28 ) to communicate. Coated roller according to claim 6, characterized in that each approach ( 14 ) a penetrating part ( 16 ) and an outer, a collar forming part ( 18 ), wherein the groove ( 26 ) is provided at the angle which passes through this penetrating part ( 16 ) and this covenant forming outer part ( 18 ) is included. Covered roller according to claim 6 or 7, characterized in that the groove ( 26 ) is annular. Covered roller according to one of Claims 5 to 8, characterized in that each ventilation hole ( 28 ) is introduced in such a way that it is attached to the side face of the corresponding projection ( 14 ) opens. Coated roller according to one of claims 5 to 9, characterized in that each approach ( 14 ) by means of adhesive ( 20 ) with the pipe ( 10 ) connected is.