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 face irregularities due to uneven heating, leading to inadequate welding or uncontrolled melting, and overheating of heating tubes, which is exacerbated by asymmetric heating pipes and the inability to adjust device length to meet varying welding requirements.
Innovation Solution
A modular hot gas welding device with a main tubular body and multiple branch tubular bodies, where gas is heated uniformly in the branch pipes and blown onto the film through evenly spaced outlet openings, allowing for adjustable length and heat input to match specific welding needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tubular body with multiple outlet openings is used, then the device structure is simple, but the gas temperature becomes uneven causing inadequate welding or uncontrolled melting
Solution Approach 1:
The single tubular body is segmented into multiple independent branch tubular bodies, each with its own gas outlet opening. This segmentation allows independent temperature control and uniform heat distribution across all outlet openings, preventing both inadequate welding and uncontrolled melting while maintaining structural simplicity through modular design
2Device complexity
If the heating tube length is fixed, then the device structure is simple, but it cannot adapt to different welding requirements such as film thickness and welding speed
Solution Approach 1:
The device incorporates adjustable parameters including the number of branch tubular bodies, their lengths, and gas flow rates. This dynamic configurability allows the heating system to be adapted to different welding requirements such as film thickness and welding speed, while the modular structure keeps the overall device design simple and flexible
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 precise and uniform temperature control across all gas outlet openings, preventing overheating and enabling flexible adaptation to different film thicknesses and welding speeds, thereby improving the quality and efficiency of the welding process.
Implementation Method 1
all branch tubular bodies being traversed by electric current
Data Source
Figure 1~2
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Figure 5~6
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 electric current flows to heat the hot gas, the device having at least one gas inlet opening (6, 106) and a plurality of gas outlet openings (12, 112) arranged adjacent to one another, from which the plastic film is blown with hot gas. The at least one gas inlet opening (6, 106) is provided on a main tubular body (4, 104) which is in gas communication with a plurality of branch tubular bodies (8, 108) at branch locations (10, 110), the branch tubular bodies (8, 108) each have at least one gas outlet opening (12, 112) and electrical current flows through all branch pipe bodies (8, 108).