Plastic Spout Preheating for Uniform Pouch Heat Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for preheating plastic spouts in collapsible pouch production are inaccurate and uncontrollable, leading to sealing flaws due to fluctuations in air flow rate, temperature, and external influences, which affect the temperature and result in inconsistent heat inputs during the heat-sealing process.
Innovation Solution
A method using distinct spout preheating and heat-sealing devices with contoured heating elements that emit heat towards the sealing walls of the spout, allowing for controlled and uniform preheating without convective heating, ensuring contact with the respective sealing walls or they may be spaced at uniform distances from the respective sealing walls, in particular in a manner that the heating elements of the preheating members are configured to face the first sealing walls. The preheating device and the heat-sealing device are distinct from the spout preheating device, and a spout preheating device, and a spout preheating device are integrated with the spout inserting device, which implies that a uniform distance between the preheating members and the sealing walls, thereby enabling more accurate preheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot air supply nozzles are used to preheat spouts, then the spout temperature is raised, but the preheating cannot be controlled accurately due to fluctuations in air flow rate, temperature, and external influences
Solution Approach 1:
The patent extracts the heating function from the air supply system and implements it through dedicated heating elements integrated into the sealing jaws. This separates the preheating function from the sealing function, allowing independent control of each process and eliminating the influence of air flow fluctuations on temperature control.
Solution Approach 2:
The patent replaces the pneumatic heating system (hot air nozzles) with an electrical heating system (heating elements). This substitution provides more precise and controllable heat generation, as electrical heating elements can be controlled with accurate power regulation, eliminating the issues of air flow rate fluctuations and external environmental influences.
2Temperature
If preheating is performed with uncontrolled air flow, then spout temperature increases, but sealing flaws occur due to inconsistent heat input
Solution Approach 1:
The patent implements preliminary preheating of the spout attachment portion before the actual sealing operation. The heating elements in the sealing jaws preheat the spout surface to a controlled temperature, ensuring that when sealing occurs, the heat input is consistent and predictable, thereby preventing sealing flaws.
Solution Approach 2:
By replacing the uncontrolled pneumatic heating system with a controlled electrical heating system, the patent achieves reliable and consistent temperature control during preheating. This ensures uniform heat distribution and predictable thermal conditions during sealing, eliminating sealing flaws caused by inconsistent heat input.
3Strength
If heat throughput through foil walls is reduced to avoid weakening, then sealing temperature must be lowered, but this requires more precise preheating control
Solution Approach 1:
The patent replaces the imprecise pneumatic heating system with electrical heating elements that offer superior temperature control. This substitution enables precise regulation of preheating temperature, allowing the process to maintain lower sealing temperatures that preserve foil wall strength while achieving consistent sealing quality through accurate thermal control.
Solution Approach 2:
The patent changes the heating mechanism from pneumatic to electrical, which fundamentally alters the controllable parameters. Electrical heating elements allow for precise control of temperature, heating rate, and duration, enabling the process to operate at lower temperatures that protect foil wall strength while maintaining manufacturing precision through programmable control parameters.
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 achieves uniform and controlled preheating of the spout sealing walls, reducing the risk of sealing flaws and ensuring consistent heat input, thereby improving the quality of the heat-sealing process.
Implementation Method 1
The spout preheating device comprises a first preheating member configured to face the first sealing wall and a second preheating member configured to face the second sealing wall... preheating at least partially the outer surfaces of the first and second sealing walls by providing heat from the first and second preheating members towards the respective first and second sealing walls
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method for producing collapsible pouches having a plastic spout involves a pouch production machine having a spout preheating device, a spout inserting device and a heat-sealing device distinct from the spout preheating device. The spout preheating device comprises a first and second preheating member (210, 220) for facing a first and second sealing wall (152, 153) of the spout (150). The opposed preheating members (210, 220) may have contoured surfaces matching the respective sealing wall (152, 153) of the spout. Preferably, the preheating members (210, 220) emit radiant heat, such as infrared, and are spaced at a constant distance (D) from the sealing walls (152, 153). Alternatively, the preheating members (210, 220) may contact the sealing walls (152, 153) to heat them via conduction. After preheating, the spout inserting device inserts the spout (150) into the pouch and are clamped together by jaws of the heat-sealing device.