Molded Skiff Drain Using PTFE Insert
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Solution Overview
Problem
Existing blow molding and rotational molding techniques face challenges in creating long through holes in boat structures, as holes longer than one inch tend to deform and leakages occur due to skin separation at drain locations, especially during temperature changes.
Innovation Solution
Molding a high melting point plastic tube, such as PTFE, into and through the wall of the boat to create longer holes and passageways, allowing for secure drainage systems and structural support without adding significant weight, using a unique retention system to maintain the tube's shape during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If through holes are made longer than one inch in blow molding or rotational molding, then drainage capability is improved, but the holes distort in undesirable ways during the molding process
Solution Approach 1:
A PTFE tube is introduced as an intermediary element that is molded into place to form the through-hole structure. The tube serves as a pre-formed insert that maintains its shape during the molding process, eliminating the distortion problems associated with creating long holes directly through blow or rotational molding. The tube is held in place by a retention system during molding, ensuring precise positioning and shape integrity.
2Ease of operation
If skin elements are separated at drain locations to allow drainage, then water drainage is improved, but water may leak into the boat structure between skin elements
Solution Approach 1:
The PTFE tube acts as an intermediary drainage component that provides a sealed pathway through the hull skin. Instead of creating open separations between skin elements, the tube is molded into the skin to form a controlled, sealed passage that allows water to drain while preventing leakage into the boat structure. The tube's presence eliminates the need for unsealed skin separations.
Solution Approach 2:
The use of PTFE material with its specific properties (high melting point, chemical resistance, and dimensional stability) changes the parameters of the drainage system. The material's ability to maintain shape and provide sealing at the molded interface enables reliable waterproofing while maintaining drainage functionality.
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
Enables the formation of holes greater than one inch in length, preventing deformation and leakage, and providing a secure drainage system in boat hulls, suitable for larger ovens and various applications, including boats and tanks.
Implementation Method 1
Molding a high melting point plastic tube, such as PTFE, into and through the wall of the boat to create longer holes and passageways
Data Source
AI summary
A molded boat with a seat drain. The boat includes a molded hull having been molded using a first material to cause the boat to have a front portion and a rear portion. The boat is molded with a bench, having been molded together with the hull using the first material. The bench includes a drain hole formed through, an otherwise solid face of the bench allowing water to flow from the front portion of the boat to the rear portion of the boat, wherein the drain hole formed through the bench is formed by using a tube molded into, and under the bench, the tube comprising a material having a higher melting point than the first material.