Device for welding plastic films by means of hot gas
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Solution Overview
Problem
Existing hot gas welding devices for plastic films suffer from irregular gas temperature distribution, leading to inconsistent welding and potential overheating or underheating, due to asymmetric heating tubes and lack of precise temperature control at outlet openings.
Innovation Solution
A device with a main tubular body and multiple branch tubular bodies, where the gas is heated uniformly in the branch tubular bodies before being blown onto the plastic film, allowing for precise temperature adjustment and even heating through controlled electric current and geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tubular body is used for heating gas, then the device structure is simple, but the gas temperature distribution becomes uneven
Solution Approach 1:
The single tubular body is segmented into multiple branch tubular bodies (first, second, third branch tubular bodies) with separate heating zones. Each branch tubular body has its own heating element, allowing independent temperature control. This segmentation enables uniform gas temperature distribution across different outlet openings while maintaining reasonable device complexity through modular design.
2Ease of manufacture
If asymmetric heating tube shape is used, then manufacturing is easier, but gas temperature uniformity deteriorates
Solution Approach 1:
Different branch tubular bodies are assigned different heating characteristics based on their position and function. The first, second, and third branch tubular bodies have different heating zone configurations and heating element arrangements, creating localized heating quality variations that compensate for asymmetric shapes and achieve overall gas temperature uniformity at all outlet openings.
3Quantity of substance
If gas outlet openings are positioned at different distances from inlet, then flow distribution is achieved, but temperature control precision is lost
Solution Approach 1:
The heating elements in each branch tubular body are designed with adjustable heating powers that can be dynamically controlled. This allows the system to compensate for different gas flow rates and path lengths in each branch, maintaining precise temperature control at all outlet openings despite variations in gas distribution requirements.
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
Ensures consistent and precise temperature of the emerging hot gas across all outlet openings, preventing overheating and underheating, resulting in uniform welding and increased processing speed with adaptable thermal input.
Implementation Method 1
all the branch tubular bodies have electric current flowing through them
Data Source
AI summary
The invention relates to a device for the preferably continuous welding of plastic films by means of hot gas with at least one tubular body through which an electric current flows for the heating of the hot gas, wherein the device comprises at least one gas inlet opening (6, 106) and a plurality of gas outlet openings (12, 112) arranged next to each other, from which hot gas is blown onto the plastic film. It is provided that the at least one gas inlet opening (6, 106) is provided on a main tubular body (4, 104), which stands in gas communication with a plurality of branch tubular bodies (8, 108) at branching points (10, 110), wherein the branch tubular bodies (8, 108) each have at least one gas outlet opening (12, 112) and all the branch tubular bodies (8, 108) have electric current flowing through them.