Liquid Container Spout Welding With Pit-Forming Film Alignment
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Solution Overview
Problem
Existing liquid container production methods face issues with wrinkles forming during film welding due to misalignment of films with non-flat sections, leading to air intrusion into the container.
Innovation Solution
A method involving the use of a second welder horn with a projection to press the second film against the spout during welding, forming a pit at the weld junction to align and stabilize the films, thereby reducing wrinkles and air intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two films with different lengths are welded together after positional alignment, then the films can be joined, but wrinkles occur in the welded portion leading to air intrusion
Solution Approach 1:
A projection is formed on the welder horn before welding occurs. This projection preemptively creates a pit structure that guides film alignment and prevents wrinkle formation during the welding process, rather than attempting to correct wrinkles after they occur.
Solution Approach 2:
The welder horn is designed with a localized projection feature at the specific position where the pit needs to be formed. This local structural modification allows precise control over the welding area, creating a targeted pit that prevents wrinkles only where needed without affecting other areas.
2Reliability
If the liquid outlet member is inserted into the bag from the mouth, then the bag can be sealed, but outside air enters through wrinkles in the welded portion
Solution Approach 1:
The projection on the welder horn creates a pit structure before welding, which preemptively prevents wrinkle formation. This ensures that when the liquid outlet member is inserted and the bag is sealed, there are no wrinkles to allow air intrusion, maintaining sealing reliability.
Solution Approach 2:
The projection feature, which initially seems like an added complexity, actually benefits the sealing process by creating a pit that prevents wrinkles. The potential harm of wrinkle formation is converted into a beneficial structured surface that ensures airtight sealing.
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 method effectively prevents wrinkles and maintains airtight sealing, ensuring efficient liquid containment and ease of use in liquid ejection apparatuses.
Implementation Method 1
welding the first film to the spout by use of a first welder and welding the second film to the spout by use of a second welder
Data Source
AI summary
An object is to provide a liquid container production method capable of hindering the occurrence of wrinkles. The liquid container production method includes: inserting a spout into a bag in which a first film including a non-flat section and a flat second film are welded together; and welding the first film and the second film to the spout. In the welding, a projection provided to a welder presses the second film and the spout, thereby forming a pit at a welded portion where the second film and the spout are welded together.