Co-extrusion of Foam-filled Plastic Profiles
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Solution Overview
Problem
Existing methods for producing hollow bodies or cavities filled with insulating material, such as window or door profiles, face logistical and technical challenges, including the need for sophisticated plastics processing and equipment, and inefficient handling and storage of separate insulating parts.
Innovation Solution
A method and device for coextruding plastic profiles with insulating material, where the starting material is activated within the extrusion device and expanded in real-time, allowing for efficient and cost-effective production of foam-filled hollow bodies without intermediate handling, using a combination of mechanical and thermal activation and controlled nozzle geometry for precise expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate insulating parts are manufactured and inserted into profiles, then insulation quality is improved, but logistical complexity and handling requirements increase
Solution Approach 1:
The patent combines the profile extrusion process and insulating material application process into a single integrated extrusion device. The insulating material is applied directly to the profile during extrusion, eliminating the need for separate manufacturing and handling of insulating parts. This merging of processes resolves the contradiction by maintaining insulation quality while reducing logistical complexity.
Solution Approach 2:
The insulating material is prepared and applied in advance during the profile extrusion process itself, before the profile is completed. The material is fed, activated, and applied to the profile in a continuous process, eliminating subsequent handling steps. This preliminary action resolves the contradiction by ensuring insulation quality is built-in while avoiding complex logistics.
2Adaptability or versatility
If insulating material is applied at the application site and expanded later, then flexibility is improved, but production time and efficiency decrease
Solution Approach 1:
The patent implements a continuous process where the insulating material is fed, activated, and applied to the profile in an unbroken sequence during extrusion. The expansion and application occur continuously as the profile is being formed, without interruption or delay. This continuity resolves the contradiction by maintaining flexibility in material application while dramatically improving production time and efficiency.
Solution Approach 2:
The insulating material is activated and prepared for expansion in advance within the extrusion device, before application to the profile. The material undergoes preliminary processing including heating and activation of expanding agents, so that expansion occurs immediately upon application. This preliminary action resolves the contradiction by enabling flexible application while reducing production time.
3Manufacturing precision
If sophisticated plastics processing equipment is used, then manufacturing precision is improved, but equipment complexity and cost increase
Solution Approach 1:
The patent merges the profile extrusion system and insulating material application system into a single integrated extrusion device. The insulating material application is incorporated into the existing extrusion process, utilizing the same heating zones, screw conveyors, and control systems. This merging resolves the contradiction by achieving high manufacturing precision through integrated process control while avoiding the need for separate complex equipment.
Solution Approach 2:
The extrusion device is designed to perform multiple functions: profile extrusion, insulating material feeding, heating, activation, and application. The same equipment components serve multiple purposes, such as the screw conveyor that both extrudes the profile and feeds the insulating material, and the heating zones that process both materials. This multi-functionality resolves the contradiction by achieving precise process control through a single versatile system rather than multiple specialized systems.
4Reliability
If intermediate handling and storage of insulating parts is required, then quality control is improved, but production efficiency and cost-effectiveness decrease
Solution Approach 1:
The patent implements a continuous process where the insulating material is fed, activated, applied, and expanded in an unbroken sequence directly on the profile during extrusion. There are no interruption points for handling, storage, or re-positioning of the material. This continuity resolves the contradiction by ensuring consistent quality control through uninterrupted processing while maximizing production efficiency.
Solution Approach 2:
All necessary preparation of the insulating material—feeding, heating, activation, and application—is completed in advance during the profile extrusion process itself. The material is ready for expansion immediately upon contact with the profile, eliminating the need for intermediate storage or handling. This preliminary action resolves the contradiction by maintaining quality control through controlled preliminary processing while eliminating efficiency-reducing intermediate steps.
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 approach simplifies production, reduces costs, and ensures high-quality, uniformly insulated profiles with efficient utilization of large-scale production technology, enabling reliable product quality and market competitiveness.
Implementation Method 1
high pressures and/or shear forces occur, which contribute at least to a thermal activation of the starting material
Implementation Method 2
the activated starting material expands immediately within the cavity or hollow body
Implementation Method 3
high pressures and/or shear forces occur, which contribute at least to a thermal activation of the starting material
Implementation Method 4
high pressures and/or shear forces occur
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
The invention relates to a process for producing a hollow body or cavity filled with insulating foam, wherein an expandable starting material of the insulating substance is fed to a plastics extrusion apparatus, is activated therein under pressure and, upon discharge therefrom into the hollow body or the cavity, is expanded with such a high volume expansion gradient that the insulating substance formed by the expansion completely fills the cross section of the hollow body or cavity without delay upon entry. The invention further relates to a plastics extrusion apparatus.