Programmable Weld Forming for Plastic Frame Corner Joints

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Solution Overview

Problem

Existing welding technologies for plastic profile elements in window or door frames often produce imperfect welds due to material imperfections, incorrect process parameters, and the need for specialized tools for varying corner shapes, leading to reduced joint strength, aesthetics, and increased production downtime.

Innovation Solution

A weld forming device with a forming tool that moves along a programmable path defined by the outer side welding line, using a control unit to adapt to different corner shapes without requiring tool changes, and a machine with integrated heating, pressing, and cooling systems to ensure consistent weld formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If specialized forming tools are used for each corner shape, then weld quality is improved, but device complexity and production downtime increase due to tool changes

Engineering Contradiction:
Improveweld qualityVSAvoidtool variety
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a single forming tool with adjustable parameters that can handle multiple corner shapes. The tool includes a forming element with controllable position and orientation, allowing it to adapt to different profile geometries without requiring specialized tools for each corner type.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent implements dynamics by making the forming tool adjustable and reconfigurable during operation. The forming element can be positioned and oriented dynamically based on the specific corner geometry being welded, allowing the same tool to perform multiple functions across different production scenarios.

Inventive Principle:
Principle #15Dynamics

2Manufacturing precision

If specialized forming tools are used for each corner shape, then weld quality is improved, but productivity decreases due to production downtime for tool changes

Engineering Contradiction:
Improveweld qualityVSAvoidproduction efficiency
Core Design Contradiction:
Manufacturing precisionVSProductivity

Solution Approach 1:

The patent eliminates the need for multiple specialized tools by implementing a universal forming tool that can be reconfigured for different corner shapes through programmable control, thereby maintaining weld quality while eliminating production downtime associated with tool changes.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the approach from physical tool changes to parameter adjustments. By controlling the position and orientation of the forming element through programmable parameters, the system maintains optimal weld quality across different corner geometries without the productivity loss of physical tool changes.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If heating temperature is reduced to avoid material degradation, then material integrity is preserved, but welding quality deteriorates due to insufficient plasticization

Engineering Contradiction:
Improvematerial integrityVSAvoidweld quality
Core Design Contradiction:
ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by concentrating heating energy precisely at the welding zone through the forming element, which acts as a localized heat source. This allows sufficient plasticization for high-quality welding at the joint interface while keeping the overall material temperature lower to prevent degradation of the bulk material.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent employs periodic action through controlled heating cycles during the welding process. The forming element applies intermittent or cyclic heating to the plastic material, allowing thermal energy to accumulate and achieve necessary plasticization without sustained high temperatures that would cause material degradation.

Inventive Principle:
Principle #19Periodic action

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 eliminates the need for custom tools, reduces production downtime, ensures strong and aesthetically pleasing welds, and closes micro-gaps, improving product quality and efficiency.

Implementation Method 1

a heating module with a heating plate configured to heat the end faces of the profile elements to plasticize the material in their area

Methodology Applied
Scientific EffectHeating: Heating

Implementation Method 2

a cooling system configured to cool the previously welded profile elements

Methodology Applied
Scientific EffectCooling: Cooling

Data Source

PatentEP4699790A1Weld form device for joining plastic elements, especially window or door frames. machine for welding elements and method for welding profile elements
Publication Date: 2026.02.25 AWGTECH SP ZOO
  • EP4699790A1 patent drawingFigure 1
  • EP4699790A1 patent drawingFigure 2
  • EP4699790A1 patent drawingFigure 3

AI summary

The invention relates to a weld forming device for joining plastic profile elements, especially window or door frames, including a forming tool (5) comprises forming edges (5a, 5b) configured to adhere to the surface of outer side walls (4) in the area of an outer side corner (C) when two profile elements (P) contact with their end faces (W), and a control unit configured to move the forming tool (5) along a forming path (T) defined by am outer side welding line (L). The invention relates also to a machine and a method for welding profile elements.