Hollow Roller With Segmented Pads For Web Embossing
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Solution Overview
Problem
Rollers in web material processing machines experience significant deflection due to high operating pressures and weight, leading to embossing defects such as uneven pattern formation and rapid wear, which existing solutions like variable crown rollers or complex mechanical systems fail to adequately address, especially when load conditions change.
Innovation Solution
A roller design featuring a hollow outer sleeve with side pads that provide torsional and axial coupling, where the peripheral surface of each pad has an axial dimension at least 1.2 times the transverse dimension, reducing deflection and allowing for variable load conditions without complex support systems or variable crowning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high operating pressures are applied between rollers to process web material, then embossing quality and material bonding are improved, but roller deflection increases causing uneven embossing patterns
Solution Approach 1:
The roller is divided into a hollow outer sleeve and separate side pads that are inserted into the sleeve. The side pads are positioned at multiple locations along the roller length and can be independently supported, allowing each segment to deflect independently rather than as a single rigid body, thus reducing overall roller deflection under pressure
Solution Approach 2:
The side pads are nested inside the hollow outer sleeve of the roller. The pads are inserted through the sleeve and positioned at specific locations, creating a nested structure where the pads are contained within the sleeve. This allows the pads to provide structural support while being protected by the sleeve, reducing deflection without adding external complexity
2Strength
If roller weight is increased to withstand high operating pressures, then roller strength and durability are improved, but roller deflection due to self-weight increases causing camber and embossing defects
Solution Approach 1:
The roller structure is segmented into a hollow outer sleeve and multiple side pads distributed along the length. This segmentation allows the load-bearing function to be distributed across multiple lighter pad components rather than requiring a single heavy solid roller, reducing self-weight-induced camber while maintaining strength through strategic placement of support pads
Solution Approach 2:
The roller employs a composite structure combining a hollow sleeve (typically metal) with side pads made of different materials that can be selected for optimal mechanical properties. This composite approach allows optimization of strength-to-weight ratio, providing sufficient load-bearing capacity while minimizing self-weight and associated deflection
3Manufacturing precision
If variable crown rollers are used to compensate for roller deflection under varying loads, then embossing consistency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The side pads are designed to be movable or adjustable within the hollow sleeve, allowing their position to change dynamically in response to varying load conditions. This dynamic adjustment capability enables automatic compensation for deflection variations without requiring complex pre-formed crown geometries, maintaining embossing consistency across different operating conditions while keeping the structure simpler
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
Significantly reduces roller deflection, enabling consistent embossing quality across varying load conditions without the need for complex support systems or multiple rollers with different crowning, thus improving the efficiency and cost-effectiveness of web material processing.
Implementation Method 1
the sleeve 103 is thermally expanded and the suitably refrigerated pads 105A, 105B, are introduced therein, so that the temperature difference between sleeve 103 and pads 105A, 105B eliminates the reciprocal interference between said members
Implementation Method 2
When the sleeve 103 and the pads 105A, 105B have again the same temperature, an interference arises between the cylindrical outer surface of the pads 105A, 105B and the cylindrical inner surface of the sleeve 103. The interference is sufficient to torsionally and axially couple the pads 105A, 105B to the sleeve
Data Source
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AI summary
The roller comprises a rotation axis (A-A), an outer sleeve (35) that is hollow inside, and a pair of side pads (40A, 40B). Each pad comprises a support and rotation journal (43A, 43B) for the roller, and a body (41A, 41B) integral with the support and rotation journal. The peripheral surface of the body (41A, 41B) of each pad (40A, 40B) has an axial dimension (A1) at least equal to a transverse dimension (D1) of the body.