Butt Welding Hygroscopic Plastic Pipe Ends Without Pre-Drying
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Solution Overview
Problem
Existing methods for welding hygroscopic plastics parts require a separate and time-consuming drying step to remove moisture, which increases energy expenditure and is not suitable for efficient butt-welding.
Innovation Solution
A method that dries the ends of hygroscopic plastics parts using a heating mirror during the welding process, ensuring moisture removal without prior drying, utilizing infrared heating and convection to achieve a contactless melting and joining process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate drying step is performed in a heating cabinet before welding, then moisture is removed from the plastics parts, but the process requires a lot of time and energy expenditure
Solution Approach 1:
The patent combines the drying function with the welding process by using the heating mirror to dry the end faces of the plastics parts during the welding operation itself, rather than performing drying as a separate preliminary step. This merging of functions eliminates the need for a separate drying cycle in a heating cabinet, significantly reducing total process time while maintaining effective moisture removal.
Solution Approach 2:
The heating mirror applies heat locally and selectively to the end faces of the plastics parts that require both drying and welding, rather than heating the entire part or using a general heating cabinet. This segmented approach focuses energy only where needed, improving efficiency and reducing overall energy expenditure.
2Reliability
If a separate drying step is performed in a heating cabinet before welding, then moisture is removed from the plastics parts, but energy expenditure increases
Solution Approach 1:
The drying function is merged with the welding process, using the same heating mirror and energy source for both drying the end faces and subsequently melting them for welding. This eliminates the need for a separate heating cabinet operation, thereby reducing total energy consumption while achieving the same moisture removal effectiveness.
Solution Approach 2:
The heating mirror provides localized heating directly at the end faces of the plastics parts, concentrating thermal energy precisely where moisture needs to be removed and where welding will occur. This localized approach is more energy-efficient than using a heating cabinet that would heat the entire part or surrounding environment.
3Temperature
If the heating mirror is disposed at a spacing from the end faces to achieve required heat for melting, then melting temperature is sufficient, but moisture blisters may form if drying is not performed first
Solution Approach 1:
The heating mirror first dries the end faces of the plastics parts by heating them to evaporate moisture, and only after this preliminary drying action is complete does it proceed to heat them to the higher temperatures required for melting and welding. This sequential approach prevents moisture blisters by ensuring moisture removal occurs before the material reaches melting temperature.
Solution Approach 2:
The heating process is dynamic and time-dependent, with the heating mirror maintaining a spacing that allows controlled heating. The process progresses through different thermal stages: initial gentle heating for moisture evaporation, followed by increased heating for melting. This dynamic control of heating intensity and duration prevents moisture blisters while achieving sufficient melting temperature.
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 efficient welding of hygroscopic plastics parts by removing moisture in-situ, reducing energy consumption and preventing moisture blisters, while maintaining precise control over temperature and spacing for optimal weld quality.
Implementation Method 1
The welding method according to the preferred embodiment of the invention is preferably performed by means of an infrared heating mirror and is accordingly contactless, that is to say the heat is applied to the ends of the plastics parts by heat radiation and convection.
Implementation Method 2
the heat is applied to the ends of the plastics parts by heat radiation and convection
Implementation Method 3
the heat is applied to the ends of the plastics parts by heat radiation and convection
Data Source
AI summary
A method for welding hygroscopic plastics parts, preferably pipeline components, by means of a butt-welding machine, wherein the two plastics parts are clamped and fixed in a coaxial position in relation to one another by means of a clamping device.