Winder

Abstract

Carrier roll winder for winding a material web divided by longitudinal cuts, e.g., a paper or board web, which has two carrier rolls arranged to form a roll bed on which the wound rolls rest with axes aligned as they are wound up. A pressure roll system is included, which has a crossmember running horizontally and displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed. The crossmember, including the pressure roll carried by it and other units carried by it, has a mass M of 9.25·I2.5, where M is the mass in kilograms and I is the length in meters. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 10 2004 051 253.1 filed Oct. 21, 2004, the disclosure of which is expressly incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a carrier roll winder for winding a material web divided by longitudinal cuts, in particular a paper or board web. The winder includes two carrier rolls, between which there is formed a roll bed on which the wound rolls rest with axes aligned as they are wound up, and a pressure roll system which has a crossmember running horizontally and is displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed. [0004] 2. Discussion of Background Information [0005] Before they can be dispatched, material webs have to be wound onto dispatch or finished rolls. The roll cores usually used for this purp...

AI Technical Summary

Benefits of technology

[0009] The present invention improves a winder in such a way that, even at a high winding speed, material webs can be wound up into large rolls of high winding quality.

[0011] The invention is based on the empirical finding that, with an operating width of preferably more than 4 m, such a selection of the mass leads to a crossmember (including the units connected to it) which does not oscillate or oscillates only insignificantly. Given a suitable choice of materials, a crossmember having this mass has the same mechanical rigidity and strength as conventional crossmembers. As a result of the lower mass of the crossmember as compared with the prior art, its oscillating mass is also lower and it is therefore possible to influence the oscillatory behavior better; this also applies to winding speeds of more than 1500 m / min.

[0016] It is advantageous if the double T beam has a web element introduced between two flange elements which additionally has a wavy structure transversely with respect to the machine direction.

[0020] A refinement in which the crossmember consists wholly or partly of steel, of aluminum or of a highly loadbearing plastic reinforced by a glass or carbon fiber composite or of another composite material is advantageous.

Problems solved by technology

At the start of winding, the line load from the contact weight of the wound rolls is not yet sufficient.

However, in the case of high-speed machines, the higher oscillation frequencies which occur in the crossmember carrying the pressure roll leads to a worsening of the winding result.

Images