Adjustable Sealing Roller Gap for Foil Integrity
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Solution Overview
Problem
Conventional sealing devices for strip packs face a conflict in ensuring a secure connection of sealing foils while protecting the products from environmental influences, as high elastic prestressing can lead to excessive pressure on longitudinal webs, potentially damaging the sealing foils and compromising the seal's tightness.
Innovation Solution
A sealing device featuring a two-part spindle or threaded rod with differently oriented thread pitches, allowing for adjustable minimum distance between sealing rollers, combined with a pneumatic spring element for elastic bias, enables precise control of roller pressure to ensure secure sealing without damaging the foils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high elastic prestressing force is applied to ensure secure connection of sealing foils at transverse webs, then sealing reliability at transverse webs is improved, but pressure on longitudinal webs becomes excessively high causing damage to sealing foils and compromising seal tightness
Solution Approach 1:
The patent applies dynamics by making the sealing rollers pivotable about their axes rather than fixed in position. This allows the rollers to dynamically adjust their orientation in response to varying pressure conditions - pivoting to reduce contact area when excessive pressure is detected, and maximizing contact area when secure sealing is needed. This dynamic adaptation resolves the contradiction between maintaining high sealing reliability and avoiding excessive pressure damage.
Solution Approach 2:
The patent changes the parameter of roller contact area by allowing the sealing rollers to pivot about their axes. This pivot movement alters the effective contact parameters between the rollers and sealing foils, enabling the system to adjust pressure distribution dynamically. By changing the contact area parameter through pivoting motion, the system can maintain reliable sealing connections while preventing excessive pressure that would damage the foils.
2Manufacturing precision
If sealing rollers are made rigid to maintain stable roller gap, then sealing precision is improved, but ability to accommodate misoriented products or foreign bodies is reduced
Solution Approach 1:
The patent resolves this contradiction by making the sealing rollers dynamically pivotable rather than statically rigid. The rollers can pivot about their axes to accommodate misoriented products or foreign bodies while maintaining stable sealing performance. This dynamic capability allows the system to adapt to varying product orientations without compromising the stability of the roller gap during normal operation.
Solution Approach 2:
The patent applies beforehand cushioning by designing the sealing rollers with pivot capability that allows them to yield or give way when encountering misoriented products or foreign bodies. This pre-designed flexibility acts as a cushioning mechanism that prevents damage before it occurs, allowing the rollers to accommodate anomalies while maintaining overall sealing precision.
3Strength
If elastic prestress force is increased to ensure secure sealing, then sealing strength is improved, but pressure on longitudinal webs becomes too high causing foil damage
Solution Approach 1:
The patent applies dynamics by enabling the sealing rollers to pivot about their axes in response to pressure conditions. When high elastic prestress force is applied, the rollers can dynamically adjust their orientation to optimize pressure distribution - pivoting to reduce pressure concentration on longitudinal webs while maintaining sufficient sealing strength at transverse webs. This dynamic adjustment resolves the contradiction between achieving strong seals and avoiding excessive pressure damage.
Solution Approach 2:
The patent changes the pressure distribution parameters by allowing roller pivoting motion. This pivoting alters the contact pressure parameters between the rollers and sealing foils, enabling the system to maintain high sealing strength where needed while reducing excessive pressure on longitudinal webs. By dynamically changing pressure parameters through pivoting, the system achieves both strong sealing and pressure protection.
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
This solution ensures a secure connection of sealing foils with reduced risk of damage, maintaining the integrity of the seal and protecting the products by allowing central adjustment of the minimum distance between rollers during operation, even when changing pack formats or replacing rollers.
Implementation Method 1
at least one sealing roller is elastically prestressed towards the other sealing roller
Implementation Method 2
a two-part spindle or threaded rod with differently oriented thread pitches, allowing for adjustable minimum distance between sealing rollers
Data Source
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AI summary
The sealing device has drives (21,22,23) for two seal rollings (4a,4b) and two roll bearings (2a,2b) for each seal rollings. The latter roll bearing is held in a plane perpendicular to the roll axis in a moving or pivoted way and is flexibly prestressed in direction form the former roll bearing. Adjustment devices (11,12,13) are provided for adjusting a minimum distance of the roll bearings forming a stop for an electrical biasing prestressing.