Marine Dock Bumper Co-Extrusion for Rigid-Flexible Impact Absorption
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Solution Overview
Problem
Existing marine dock bumpers lack an effective two-stage extrusion process that combines a rigid thermoplastic 'L' shaped bracket with a flexible elastomeric arcuate portion for impact force absorption, and they often require additional components for lighting integration, which complicates the manufacturing process.
Innovation Solution
A two-stage extrusion process that initially forms a rigid HDPE 'L' shaped bracket, followed by extruding a flexible TPE or elastomeric parabolic portion in an open position, which can be flexed into a closed engagement with the bracket, and includes features for LED integration, using a cross head die and cooling processes to maintain shape and control temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-stage extrusion process is used to create marine dock bumpers, then the manufacturing process is simpler, but the bumper cannot effectively combine rigid structural support with flexible impact absorption
Solution Approach 1:
The bumper is divided into two distinct functional segments: a rigid thermoplastic 'L' shaped bracket providing structural support and mounting capability, and a flexible elastomeric arcuate portion providing impact absorption. This segmentation allows each material to be optimized for its specific function while being manufactured through a coordinated two-stage extrusion process.
Solution Approach 2:
The invention employs composite construction by combining two different materials with complementary properties: a rigid thermoplastic material (such as HDPE) for the bracket portion and a flexible elastomeric material (such as TPE) for the arcuate portion. This composite approach enables the single bumper component to simultaneously provide both structural integrity and shock absorption.
2Adaptability or versatility
If additional separate components are used for lighting integration in marine dock bumpers, then lighting functionality is achieved, but the overall device complexity and assembly requirements increase
Solution Approach 1:
The lighting functionality is merged directly into the bumper structure by integrating LED elements and associated mounting features within the extrusion process itself. The rigid bracket portion includes built-in mounting features that accommodate lighting elements, eliminating the need for separate attachment components and simplifying installation.
Solution Approach 2:
The bumper design incorporates multi-functionality by combining structural support, impact absorption, and lighting integration capabilities into a single unified component. The rigid bracket serves both as a structural element for mounting the bumper to the dock and as a platform for integrating lighting elements, thereby serving multiple functions simultaneously.
3Ease of manufacture
If the elastomeric portion is extruded in a closed position, then engagement with the bracket is immediate, but the extrusion process becomes more difficult and shape control is reduced
Solution Approach 1:
The elastomeric arcuate portion is extruded in a preliminary open position that facilitates easier material flow and shape formation during the extrusion process. After extrusion, the elastomeric portion is then flexed into its final closed engagement position with the bracket, allowing both ease of manufacture and proper shape retention to be achieved.
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
The process creates a marine dock bumper with enhanced impact force absorption and the ability to integrate lighting, offering a more efficient and adaptable manufacturing method for producing marine bumpers with improved performance.
Implementation Method 1
a cross head die arrangement is utilized in order to extrude a secondary arcuate (typically parabolic shaped) and flexible material
Implementation Method 2
The "L" shaped bracket is initially shaped and cooled in the first stage extrusion on process
Data Source
AI summary
An assembly and process for forming a two stage extrusion of an elongated marine dock from a plasticized material, such as including but act limited to extruding a first generally “L” shaped bracket from a first more rigid thermoplastic, following which a cross head die arrangement is utilized in order to extrude a secondary arcuate and flexible material in extending fashion from a lower side of the “L” bracket. The secondary/flexible elastomer is extracted in an open flexed position relative to the first extruded bracket, and further such that, following completion, can be flexed into a closed engagement with an upper perpendicularly extending side of the bracket.