Rotating Press Element for Polymer Pipe Outer Wall Bonding
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Solution Overview
Problem
Existing methods for manufacturing polymer drainage pipes often result in insufficient bonding between the extruded outer layer and the polymer pipe surface, leading to inadequate weld strength, especially when high extrusion temperatures fail to ensure thorough fusion beyond the immediate exterior surface.
Innovation Solution
A press rolling apparatus and method that involves extruding a polymer layer onto a pipe and then conveying it through a rotating pressing apparatus with a pressing element to apply pressure, ensuring deeper bonding between the outer layer and the pipe surface, utilizing a frame with an annular carriage and a translational pressing element to enhance the bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the outer layer of polymer is extruded at a high temperature to bond with the exterior surface of the polymer pipe, then the bonding between the outer layer and the pipe surface is improved, but the bonding depth remains insufficient and the weld strength is inadequate
Solution Approach 1:
The exterior surface of the pipe is pre-heated before the outer layer is extruded, preparing the surface to receive and bond with the extruded polymer layer more effectively. This preliminary heating action ensures that when the outer layer contacts the surface, there is sufficient thermal energy available for deep fusion and strong bonding.
Solution Approach 2:
A heated intermediary surface or heating element is introduced between the extruded outer layer and the pipe surface to facilitate heat transfer. This intermediary ensures that thermal energy is efficiently transferred to the bonding interface, enabling deeper penetration and stronger weld strength without requiring excessively high extrusion temperatures.
2Ease of manufacture
If a very thin layer of the exterior surface is allowed to weld to the newly extruded outer layer, then the extrusion process is simple, but the level of bonding is too shallow to provide sufficient weld strength
Solution Approach 1:
The temperature parameters of the pipe surface and/or the extruded outer layer are modified through heating before bonding. By increasing the temperature of the bonding interface, the polymer material becomes more pliable and penetrates deeper into the opposing surface, creating a stronger weld without complicating the extrusion process itself.
Solution Approach 2:
The pipe surface is pre-heated before the outer layer is extruded, preparing the surface to receive and bond with the extruded polymer layer more effectively. This preliminary heating action ensures that when the outer layer contacts the surface, there is sufficient thermal energy available for deep fusion and strong bonding.
3Productivity
If the outer layer is extruded at high temperature to melt the exterior surface, then the bonding process is accelerated, but the bonding depth remains insufficient beyond the immediately exterior surface
Solution Approach 1:
A heated intermediary surface or heating element is introduced between the extruded outer layer and the pipe surface to facilitate heat transfer. This intermediary ensures that thermal energy is efficiently transferred to the bonding interface, enabling deeper penetration and stronger weld strength without requiring excessively high extrusion temperatures.
Solution Approach 2:
The temperature parameters of the pipe surface and/or the extruded outer layer are modified through heating before bonding. By increasing the temperature of the bonding interface, the polymer material becomes more pliable and penetrates deeper into the opposing surface, creating a stronger weld without complicating the extrusion process itself.
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 solution effectively increases the bonding depth between the outer and inner layers of the polymer pipe, enhancing the structural integrity and strength of the multi-wall polymer pipes by ensuring a proper fusion of the polymer layers, even when extruded at high temperatures.
Implementation Method 1
urging the pressing element against an exterior surface of the outer wall as the pressing element rotates about a pipe conveyed through the pressing apparatus
Implementation Method 2
as the pressing element rotates about a pipe conveyed through the pressing apparatus
Data Source
AI summary
A method of pressing an outer wall of polymer pipe is provided. The method includes extruding a layer of polymer onto a pipe to form an outer wall of pipe; conveying the pipe including the outer wall of pipe through a pressing apparatus having a pressing element configured to rotate about the pipe; and urging the pressing element against an exterior surface of the outer wall as the pressing element rotates about a pipe conveyed through the pressing apparatus. An apparatus for pressing an outer wall of polymer pipe is also provided.