Serpentine paper drying machine

Abstract

A paper drying apparatus to dry a paper web carried on a fabric sheet includes a first rotatable drum to carry a paper web. A second rotatable drum or carrying roll is positioned downstream to the first drum with respect to the paper web carried by the first drum and second drum or roll. Successive drums or rolls are positioned downstream of the first two rolls to carry the paper web through the complete drying system. A common air supply system is utilized to direct air through the initial and successive rolls, with the direction of the drying air always contacting the sheet before the carrier fabric.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] Not Applicable FEDERALLY SPONSORED RESEARCH [0002] Not Applicable SEQUENCE LISTING OR PROGRAM [0003] Not Applicable BACKGROUND OF INVENTION [0004] 1. Field of the Invention [0005] This invention relates to the drying a paper webs, specifically with configurations for through-air-drying of those webs. [0006] 2. Background of the Invention [0007] Paper products, e.g., tissues, have conventionally been manufactured by forming a wet paper web on a fabric-carrying sheet, which then carries the paper web through a pressing section to remove the excess water from the web. After pressing the web to remove excess water, the paper web would then be fed to a separate drying section to fully remove the remaining moisture from the web. This step of pressing the web, however, reduces bulk and absorbency. Therefore, as opposed to leaving the web as a flat sheet on a single plane, rotatable air-heated drum dryers over which the web traveled were utilize...

AI Technical Summary

Benefits of technology

[0015] By the nature of the sheet and dryer support fabric remaining inside the drying system in between rotatable drums and carrier rolls, the maximum drying benefit is derived from the system, avoiding the cooling affect between stations of previous inventions.

[0016] From the foregoing disclosure, it will be readily apparent to those skilled in the art, that is, those who are knowledgeable or experienced in this area of

Problems solved by technology

This step of pressing the web, however, reduces bulk and absorbency.

Whenever wet paper webs contact carrying rolls, machine run ability problems as well as product quality problems may be encountered, especially when the web is wet in the range of 65% moisture and higher moisture.

Further, machines that have one roll have limited drying capacity and are therefore of limited commercial interest.

Because of the water content of steam, the medium cannot be used to dry a sheet to the required solids content.

Furthermore, it is economically more efficient and proficient to employ heated air rather than a combination of air and steam when using a blowing device to dry a wet

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