Pressure hood with removable seal assembly

Abstract

A pressure hood with a pressure hood body to be used in conjunction with especially a heated cylinder in a machine for the production and / or conversion of a fibrous web, especially a paper-, cardboard- or tissue web, and a seal assembly to seal said pressure hood body against the cylinder, provides that the seal assembly can be inserted into or removed from the pressure hood body—particularly when the pressure hood is installed on the cylinder—through a movement in axial direction relative to the pressure hood body.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of PCT application No. PCT / EP2007 / 058527, entitled “PRESSURE HOOD HAVING A REMOVABLE SEALING APPARATUS”, filed Aug. 16, 2007, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a pressure hood with a pressure hood body to be used in conjunction with especially a heated cylinder in a machine for the production and / or conversion of a fibrous web, especially a paper-, cardboard- or tissue web, and a seal assembly to seal said pressure hood body against the cylinder.[0004]2. Description of the Related Art[0005]A pressure hood of this type is essentially known and is used for example in a dryer for the continuous drying of a fibrous web coming off the outer circumference of a heated cylinder. Due to the heat released from the cylinder to the fibrous web, moisture evaporates from the fibrous web and is absorbed by at least one wire or fabric w...

AI Technical Summary

Benefits of technology

[0012]Once the seal assembly has been slid from the pressure hood the individual seals are easily accessible and can be exchanged easily and quickly. This shortens the machine down time associated with a seal replacement or exchange, resulting in a more economical operation of the machine including the cylinder and the pressure hood.

[0041]In order to reduce the machine down time even further and to simplify the replacement of seals even further, two change-over racks may be provided, whereby the one change-over rack is provided to receive a first seal assembly that is to be removed from the pressure hood body, and the other change-over rack carries a second seal assembly to be inserted into the pressure hood body in place of the first seal assembly. Immediately after sliding the first seal assembly from the pressure hood body, the second seal assembly can therefore be inserted into the pressure hood body and machine operation can be resumed. While the machine operation is continued with the second seal assembly, the worn seals from the first seal assembly can be renewed or replaced, thereby preparing the first seal assembly for renewed service in the pressure hood.

Problems solved by technology

The seals drag on the moisture impermeable belt and are subject to especially high wear and tear because of the sliding friction that exists between the seals and the moisture impermeable belt.

Traditionally the entire pressure hood must be removed from the cylinder for this purpose, or the seal assembly must be constructed so that it can be disassembled and must be taken apart which, respectively causes considerable assembly work directly at the machine.

This is not only expensive, but also time consuming, so that expensive down times are caused by the seal replacement.

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