Composite Profile Extrusion with Friction-Welded Metal Reinforcement
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Solution Overview
Problem
Existing methods for connecting plastic and metal profiles in composite structures face challenges such as complex installation, mechanical stress due to temperature changes, and the need for additional fastening steps, which affect durability and recyclability.
Innovation Solution
A method involving unwinding a metal sheet, applying an adhesion promoter, and passing it through an extrusion die to bond it with a plastic layer, followed by friction welding to create a composite profile without additional fastening, allowing for thin metal sheets to reinforce the plastic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal cover is latched or glued to a plastic profile, then weather resistance is improved, but installation complexity and work steps increase
Solution Approach 1:
The metal sheet and plastic layer are combined into a single integrated composite profile through extrusion, eliminating the need for separate attachment steps. The metal sheet is fed through the extrusion die along with the plastic material, creating a permanently bonded composite structure that maintains weather resistance while simplifying installation.
Solution Approach 2:
The metal sheet is prepared in advance by unwinding from a coil and positioning it before the extrusion process. The bonding agent is applied to the metal sheet prior to extrusion, ensuring that the bonding occurs automatically during the extrusion process rather than requiring post-assembly fastening operations.
2Ease of manufacture
If a metal sheet is embedded in plastic through roll forming and extrusion, then production simplicity is improved, but the connection strength under thermal stress may worsen
Solution Approach 1:
A bonding agent is introduced as an intermediary substance between the metal sheet and plastic layer. This bonding agent contains plastic material that is compatible with both the metal surface and the extruded plastic, creating a strong chemical and mechanical bond that resists thermal stress while maintaining the simplicity of the extrusion process.
Solution Approach 2:
The invention creates a true composite material structure where metal sheet, bonding agent, and plastic layer are permanently combined into a single composite profile. This composite structure leverages the strengths of each material - the metal provides reinforcement and weather resistance, while the plastic provides insulation and structural form, with the bonding agent ensuring strong interfacial adhesion.
3Strength
If additional adhesives are used to bond metal and plastic, then connection strength is improved, but recyclability worsens
Solution Approach 1:
The bonding agent's composition is specifically designed to match the plastic material being extruded. By changing the parameters of the bonding agent to be chemically compatible with the extruded plastic, the bond becomes as integral as the plastic itself, allowing the entire composite profile to be recycled together without requiring separation of adhesive layers.
Solution Approach 2:
The bonding agent is applied in a thin layer that is consumed during the extrusion process, becoming an integral part of the composite structure. Rather than using substantial amounts of separate adhesive that would complicate recycling, the bonding agent is incorporated into the plastic matrix, making the entire profile recyclable as a single composite material.
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 method simplifies production, enhances durability, and enables effective mechanical reinforcement while eliminating the need for additional adhesives, facilitating recycling.
Implementation Method 1
Under the high pressure of the extrusion nozzle, the bonding agent creates sufficient adhesion between the plastic profile and the metal sheet
Implementation Method 2
the plastic layer (5) is bonded to the plastic profile (2) by friction welding
Data Source
Figure 1~2
AI summary
A method for producing a composite profile (1) comprises the following steps: - unwinding a metal sheet from a coil; - feeding the metal sheet to an extrusion die for extruding a plastic layer (5), and - passing the metal sheet with the plastic through a nozzle of the extrusion die and bonding the metal sheet to the plastic layer (5), wherein an adhesion promoter is applied to the metal sheet before being fed to the extrusion die and the metal sheet with the plastic layer (5) is fixed to a plastic profile (2) by friction welding after leaving the nozzle of the extrusion die. In addition, a composite profile (1) with an extruded plastic profile (2) and at least one metallic cover profile (3, 4) made of a metal sheet is also provided.