Expander roller for fold-free expansion of foils
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Solution Overview
Problem
Existing expander rollers with densely packed, obliquely implanted brush plugs suffer from incomplete and non-uniform spreading forces on materials, leading to increased production costs and inefficiencies.
Innovation Solution
An expander roller with a grid of obliquely implanted brush plugs forming specific angles and shifted rows, optimized for a predetermined center-to-center distance and varying dimensions, constructed from synthetic materials like polypropylene, to achieve efficient and uniform expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If brush plugs are densely packed in intensive rows on the expander roller circumference, then the spreading force coverage is increased, but the spreading uniformity deteriorates and production costs increase
Solution Approach 1:
The expander roller surface is segmented into multiple rows of brush plugs with specific spacing patterns. The brush plugs are arranged in a grid pattern with predetermined axial distances and tangential distances, creating distinct segments that collectively provide uniform spreading force across the foil width without requiring dense packing.
Solution Approach 2:
The brush plugs are obliquely implanted at specific angles (alpha and beta) relative to the roller axis and radial plane, creating an asymmetric arrangement. This asymmetric angular positioning allows the brush plugs to engage the foil at optimized angles that improve spreading uniformity while reducing the overall density requirement.
2Quantity of substance
If brush plugs are densely packed in intensive rows on the expander roller circumference, then the spreading force coverage is increased, but production costs increase
Solution Approach 1:
By segmenting the brush plug arrangement into spaced rows with predetermined distances, the total number of brush plugs required is reduced compared to dense packing. This segmentation maintains adequate coverage while lowering material costs and simplifying the manufacturing process.
Solution Approach 2:
The invention optimizes specific parameters including the axial distance X between rows, the tangential distance based on angle beta, and the oblique implantation angles alpha and beta. By carefully selecting these parameters, the design achieves effective spreading with fewer brush plugs, reducing production costs while maintaining performance.
3Length of stationary object
If brush plugs are placed in an elliptical pattern around the roller circumference, then the distance between rows is increased, but the spreading effectiveness is reduced and complexity increases
Solution Approach 1:
Instead of an elliptical pattern, the invention uses straight parallel rows of brush plugs spaced at predetermined axial distances. This segmented linear arrangement maintains consistent spacing across the roller circumference, ensuring uniform spreading effectiveness while simplifying the geometry and improving manufacturability.
Solution Approach 2:
The grid pattern with uniform axial spacing X and uniform tangential spacing (based on angle beta) creates a homogeneous distribution of brush plugs across the roller surface. This homogeneous arrangement ensures consistent spreading force throughout the foil width, avoiding the variability introduced by elliptical patterns.
4Quantity of substance
If brush plugs are obliquely implanted at high density, then coverage is improved, but the spreading uniformity deteriorates
Solution Approach 1:
The oblique implantation of brush plugs at controlled angles alpha and beta creates an asymmetric engagement pattern with the foil. This asymmetric angular positioning distributes the spreading force more uniformly across the material width, preventing the concentration of force that occurs with dense parallel arrangements.
Solution Approach 2:
Each brush plug is positioned with specific local quality characteristics including its oblique angle and spacing from neighboring plugs. This localized optimization of each brush plug's position and orientation ensures that the collective action of all plugs produces uniform spreading, even at moderate densities.
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 design results in a more economical and effective expander roller capable of uniformly expanding thin material widths with improved manufacturing efficiency and adaptability for various applications.
Implementation Method 1
brush plugs with a free length t... elastic brush plugs... spread said foils or widths of different materials
Implementation Method 2
elastic brush plugs... synthetic material such as polypropylene... diameter of plug threads, fibers or bristles
Data Source
AI summary
An expander roller for a fold-free expansion of foils, webs, and sheet materials in a width dimension. The expander roller has a central metal axle mounted in a surrounding synthetic tube with placed on its circumference a grid of implanted brush plugs in an axial direction under an angle alpha and with a mutual distancing and in tangential direction under a center angle beta and with a mutual distance. The roller provides a perfect expanding or stretching of thin widths of different materials.