Extruded Polymer Rail for Aseptic Roller Conveying
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Solution Overview
Problem
Roller rails made of galvanized sheet metal or aluminum are prone to rust, fail to meet aseptic conditions required in pharmaceutical and food industries, and have laborious roller replacement processes due to entrapped spindle assemblies.
Innovation Solution
A U-shaped rail profile made of extruded polymer material, such as polypropylene, with foldable plastic tabs to prevent spindle displacement and snap-fit elements for easy assembly and disassembly, ensuring aseptic compatibility and resistance to corrosive environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal profiles (galvanised sheet metal or aluminium) are used for the rail, then structural strength and rigidity are improved, but the rail eventually rusts and fails to meet aseptic conditions required in pharmaceutical and food industries
Solution Approach 1:
The patent changes the material parameter from metal to polymer (specifically polypropylene or similar plastics). This material substitution eliminates rust and corrosion issues while maintaining structural integrity through proper polymer selection and profile design. The polymer material provides resistance to corrosive liquids and meets FDA certification for food contact and sterilization processes.
Solution Approach 2:
The patent employs composite construction by combining polymer material with metal spindles and rollers. The U-shaped profile is made of polymer for corrosion resistance, while metal components (stainless steel spindles, metal rollers) provide necessary mechanical strength and rolling function. This composite approach resolves the contradiction by assigning different material properties to different functional requirements.
2Stability of the object's composition
If rivets are used to secure spindles in metal profiles, then the spindles are firmly entrapped, but roller replacement becomes laborious and difficult requiring forceful deformation of metal walls
Solution Approach 1:
The patent transforms the static, permanent rivet connection into a dynamic, reversible system using snap-fit elements. The spindles are retained through elastic deformation of polymer tabs that snap into place during assembly, but can be easily released by applying force to disengage the snap-fit mechanism. This allows firm retention during operation while enabling simple replacement when needed.
Solution Approach 2:
The patent divides the retention mechanism into separate functional elements: flexible polymer tabs provide the retaining force, while distinct snap-fit elements (such as protrusions or clips) provide the reversible locking mechanism. This segmentation allows the retention function to be independently optimized for both security and ease of release, unlike the integrated rivet system.
3Manufacturing precision
If metal profiles are used for the rail, then manufacturing precision can be achieved, but the rail produces noise during use due to vibrations
Solution Approach 1:
The patent changes the material parameter from metal to polymer, fundamentally altering the vibration characteristics. Polymer materials have higher internal damping properties that naturally absorb and dissipate vibrational energy, converting mechanical vibrations into heat rather than transmitting them as noise. This material substitution maintains manufacturing precision through extrusion processes while eliminating the noise problem inherent in metal constructions.
Data Source
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AI summary
Comprises a substantially U-shaped profile (2) to support a plurality of rollers (4), each of the side walls (2a) of the aforesaid profile (2) including a plurality of holes (3) to receive the ends of the spindles of said rollers (4), said rollers (4) being capable of rolling in respect of said profile (2) in order to allow the conveying of said goods over the rail (1), and is characterized in that said U-shaped profile (2) is a profile (2) made of an extruded polymer material. A rail is obtained that can be used in food, horticultural and/or pharmaceutical industries.