DE2517474A1 - Printing roll facing of impregnated non-woven fibres - tightly wound onto core, has capillary properties and low deformation - Google Patents

Abstract

A capillary roll facing, esp. for use in colour storage rolls in printing equipment or copying equipment is made of a fibrous non-woven wound onto a rigid or flexible core made of materials possessing a capillary character and is then impregnated, the fibres used for making the non-woven may be natural or synthetic fibres or a mixture of both. Esp. used as a storage or transfer roll for printing machines or other printing equipment, where ink or coloured materials are used. The facing possesses long life with low deformation, and high wear resistance.

Description

Capillary roll cover made of nonwoven fabric The invention relates to capillary roll covers, those made from nonwovens or from a combination of nonwovens with materials which have a capillary character, such as felt, rubber with open pores, polyurethane or polyether foam or other products with a capillary character based on natural or synthetic raw materials. When combining materials with With its capillary character, the nonwoven fabric serves as the outer wrapping for qualitative purposes Improving and increasing the service life of such roll covers in practical use. The preferred use of such capillary roll covers is the use as called arbspeicher- or inking roller in printing machines or printing devices.

What is essential in such ink storage rollers is not only a high one Color storage capacity and the ability to store the color under pressure in the to release just the required amount again a high mechanical strength of the roller body and especially its surface.

It is known that roll covers made of felt or pore rubber with open Natural or synthetic pores are used as ink storage rollers Find. All previously known designs have shortcomings. Either it will be functional prematurely impaired by too rapid permanent deformation of the roller cover or the materials used are subject to rapid wear and tear.

The invention is concerned with the task of capillary roll covers with a high storage capacity for liquid or paste-like media at the same time to create good dimensional stability and high wear resistance.

The object is achieved according to the invention in such a way that a nonwoven fabric for the production of the capillary roller body is used or a nonwoven fabric is applied as a coating to previously used materials to their function to improve and to increase their service life.

For this purpose, a nonwoven fabric is produced by tightly wrapping a roller core or another suitable support material up to the desired diameter formed into a roller body. It is then impregnated Winding or it is impregnated at the same time during the winding process. Through this the fibrous nonwoven layers are firmly bonded to one another, so that after drying or, if necessary, after heat treatment and subsequent bedding a roller cover is created in which there is a transition from one winding layer to the other is no longer perceptible. Such a roller cover has very good capillary properties, so that it is excellently suited as a color storage element.

Embodiment 1 "A nonwoven fabric made of polyester fibers with Acrylic acid ester bond with a thickness of approx. 0.15 mm and a weight of approx. 45g per m2 is wrapped tightly around a metal core and then with a Slurry of PVC powder in a solvent-plasticizer mixture containing propellant impregnated and heated after the solvents have evaporated. A material is created with very good mechanical properties, very good capillarity and excellent Barb storage wealth '.

In a similar way, other nonwovens made of natural or synthetic fibers such as cotton, glass, rayon, polyacrylonitrile, PVC, polyamide or polypropylene can be processed. The one in the exemplary embodiment 1 listed propellant additive to the impregnation solution has a beneficial effect on the Capillary properties. By preparing the roller core with a binding agent the nonwoven roll can be connected properly to the roller core.

The non-woven fabric roll can also be placed on the roll core Pulled-on piece of pipe or a hose, e.g.

made of soft PVC. There is a closed inner soul in many In cases of capillary roller covers, this is advantageous in terms of processing and application.

Exemplary embodiment 2 A nonwoven fabric according to the exemplary embodiment 1 is wrapped around a hose made of soft PVC with a wall thickness of 0.5 mm, which was previously mounted on a roller core. The impregnation is also carried out according to embodiment 1. The result is a capillary roller cover with the one in the embodiment 1 described properties, but with a closed inner core.

Sin application-wise advantage through the incorporation of a closed Inner core made of e.g. Weicli-PVC ia a capillary roller cover results from this, that either hose ends protruding from the roll on both sides subsequently With the addition of heat, deformed to form seals on the face side or on both sides of the face Attached closing discs e.g. also made of soft PVC, welded to the inner core can be.

This creates a capillary roller cover in a comprehensive embedding, in which it is not possible for stored paint to leak out to the side.

Finally, previously used materials such as felt and pore rubber with a layer that protects these materials and improves the surface encased from wound fiber nonwoven layers and then or during the Windings are impregnated.

The object of the invention is illustrated in the drawing by 4 figures explained.

FIG. 1 shows the fleece roll on a roller core. FIG. 2 shows the Fleece wrap on a thin-walled tube Figure 3 shows the fleece wrap in one comprehensive flexible embedding Figure 4 shows the FasewrvriaeswúmmaneBung a Roller body made of felt or pore rubber

Claims (5)

Claims: O Eapillary roller cover for preferential use for bar storage rollers in printing machines, apparatus or copiers, thereby characterized in that the capillary roll cover made of nonwoven fabric on a solid or flexible bodies or materials that have a capillary character, is wound and impregnated, the fibers used in the manufacture of nonwovens Naturally obtained or synthetically produced or a mixture of both types can represent. 2) capillary roller cover according to claim 1, characterized in that the non-woven fabric lap by impregnation via solution, dispersion or slurry with a vulcanizable or crosslinkable elastomer based on natural or Synthetic rubber, polyurethane or thermoplastics such as polyamide, polyethylene, polyvinyl chloride, Polyvinyl acetate or their copolymers or polyvinyl alcohol, if appropriate in combination of processing aids such as vulcanizing, crosslinking or plasticizing agents is enriched. 3) capillary roller cover according to claim 1 and 2, characterized in that that the impregnating agents propellants such as benzene sulfohydrazide, benzene disulfohydrazide, Dinitrosopentamethylenetetramine, diphenylsulfone 3,3 1-disulfohydrazide, azodicarbonamide or sodium bicarbonate individually or in combination with each other in one dosage 5-25% based on the weight of the elastomer or thermoplastic can be added. 4) capillary roller cover according to claim 1, characterized in that the winding of the nonwoven fabric takes place on a tubular body and with this is firmly connected by suitable adhesives or adhesives. 5) capillary roller cover according to claim 1, characterized in that the hose body is laterally embedded in a comprehensive way by means of end pieces or the winding of the nonwoven fabric onto a coil-shaped, flexible molded part he follows. Blank page