Compact Single-Tier Drying Group Without Pocket Components
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Solution Overview
Problem
Existing drying groups in fiber web production lines have issues with runnability components in pocket spaces, requiring significant space, investment, and energy costs, and are prone to wear and maintenance challenges.
Innovation Solution
A fully compact single tier drying group geometry with short distances between drying cylinders and turning rolls, utilizing a perforated vacuum turning roll and end seals to maintain underpressure without runnability or vacuum components in the pocket space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional runnability components with seals are used in pocket spaces, then runnability of the drying section is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention extracts and eliminates the runnability component from the pocket space by redirecting the drying wire to contact the turning roll directly. This removes the complex sealed component while maintaining runnability through the wire-turning roll contact, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
Instead of using a runnability component to create vacuum in the pocket space, the invention inverts the approach by using the drying wire itself contacting the turning roll to create the necessary vacuum effect. This eliminates the need for separate runnability components and their associated seals.
2Reliability
If runnability components are installed in pocket spaces, then fiber web attachment to drying wire is improved, but investment costs and energy consumption increase
Solution Approach 1:
The invention removes the runnability component from the pocket space and replaces it with direct drying wire-to-turning roll contact. This eliminates the energy-consuming vacuum system while maintaining fiber web attachment through the modified geometry, resolving the contradiction between reliability and energy cost.
3Reliability
If seals are placed against drying cylinders and turning rolls, then negative pressure effect is confined, but seal wear and maintenance needs increase
Solution Approach 1:
The invention extracts the seals and runnability component entirely from the system. Negative pressure confinement is achieved through the redirected drying wire contacting the turning roll, eliminating moving seals and their associated wear and maintenance requirements, resolving the contradiction between reliability and ease of repair.
4Productivity
If drying cylinders are arranged with standard spacing, then drying capacity is maintained, but drying section length increases
Solution Approach 1:
The invention changes the spatial arrangement by redirecting the drying wire to contact the turning roll directly, creating a more compact pocket space geometry. This dimensional reconfiguration reduces the length required for each drying group while maintaining drying capacity, resolving the contradiction between productivity and length.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces the length of the drying section, decreases investment and energy costs, and eliminates the need for runnability components, resulting in a more sustainable and cost-effective drying process.
Implementation Method 1
utilizing a perforated vacuum turning roll and end seals to maintain underpressure
Data Source
Figure 1
Figure 2
Figure 3~4A
AI summary
The invention relates to a drying group for drying a fiber web, which drying group is a single tier drying group i.e. applies single wire draw and comprises at least two drying cylinders (12), at least one turning roll (11) and a drying wire (10) supporting the run of a fiber web, in which drying group the fiber web that is being dried is arranged to run on support of the drying wire (10) such that the drying wire (10) presses the fiber web on the drying cylinder (12) against heated cylinder surface, and the fiber web remains at the side of the outside curve of the turning roll (11) situated below and between the drying cylinders (12), and in which drying group a pocket space (T) is confined by two adjacent drying cylinders (12) and the turning roll (11) situated between and below the drying cylinders (12) and by the drying wire (10). Geometry of the drying group is fully compact such that distances in at least one of the pocket space (T) of the drying group between the two adjacent drying cylinders (12) and between the drying cylinder (12) and the turning roll (11) are 10-50 mm. The invention also relates to a drying section.