Low Frequency Modulated Heat Sealing Apparatus
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Solution Overview
Problem
Existing heat sealing methods are inefficient, limited by material compatibility, require long cycle times, can damage materials, and are costly, particularly for sealing non-dielectric materials and longer seals.
Innovation Solution
A low-frequency modulated heat sealing apparatus using resistance heating elements with a microprocessor-controlled power pulsing mechanism delivers intermittent pulses of heat and cooling intervals, optimizing heat transfer to bond materials without damaging them, suitable for various materials and lengths of seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous heat sealing is used, then sealing speed is improved, but material damage occurs due to excessive heat accumulation
Solution Approach 1:
The patent applies periodic action by using intermittent pulse heating instead of continuous heating. The microprocessor controls the power supply to deliver heat in discrete pulses with controlled duration and interval, allowing heat to be applied rapidly during pulse periods while preventing damage during interval periods. This resolves the contradiction by enabling high sealing speed during pulses while avoiding material damage through strategic pauses.
Solution Approach 2:
The patent changes the temporal parameter of heat application from continuous to pulsed mode. By adjusting pulse duration, interval duration, and duty cycle, the system optimizes heat delivery to achieve fast sealing without material damage. The microprocessor dynamically controls these parameters to match the specific requirements of different materials and sealing conditions.
2Loss of time
If high frequency heat sealing is used, then sealing time is reduced, but interference with electronic systems occurs
Solution Approach 1:
The patent uses periodic pulsed heating controlled by a microprocessor, which inherently limits the frequency content to lower ranges. The intermittent nature of the heating cycles prevents generation of high-frequency electromagnetic interference that would affect electronic systems, while still achieving fast sealing through optimized pulse timing and duration.
3Object-affected harmful factors
If impulse heat sealing is used, then material damage is avoided, but sealing time increases significantly
Solution Approach 1:
The patent optimizes the temporal parameters of heat application by using controlled pulse durations and intervals that are longer than traditional impulse sealing but shorter than continuous sealing. The microprocessor adjusts pulse width and duty cycle to deliver heat at an optimized rate that balances material protection with sealing speed, resolving the time loss issue while maintaining material safety.
Solution Approach 2:
The patent maintains continuity of useful action by using multiple overlapping pulse cycles that continuously progress the sealing process. Rather than waiting for complete cooling between impulse cycles, the system maintains a steady rhythm of heated intervals that keep the sealing process active and progressive, significantly reducing total sealing time while avoiding material damage.
4Use of energy by moving object
If heating elements are placed in direct contact with materials, then heat transfer efficiency is improved, but material cutting or damage occurs
Solution Approach 1:
The patent uses periodic pulsed heating to prevent material cutting while maintaining heat transfer efficiency. The intermittent nature of the heating allows the material to dissipate heat between pulses, preventing thermal runaway and cutting, while the rapid pulse delivery maintains efficient heat transfer during the active heating periods.
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
This method enables rapid, efficient, and cost-effective heat sealing of multiple layers or sheets of different materials without damaging them, reducing cycle times and avoiding interference with electronic systems, while being programmable for optimal use with diverse materials.
Implementation Method 1
a first resistance heating element extending along an upper sealing bar lower surface and a second resistance heating element extending along a lower sealing bar upper surface
Implementation Method 2
delivering packets of heat into the sheet materials for durations that raise sheet outer surface temperatures
Data Source
AI summary
A heat sealing apparatus including a first sealing bar having a first sealing bar contact surface with a first resistance heating element extending along the upper sealing bar contact surface; a second sealing bar having a second sealing bar contact surface; a sealing bar moving mechanism for moving the first sealing bar and the second sealing bar away from and toward each other into compression contact; a power pulsing mechanism including a microprocessor running a computer program for delivering electric power pulses to the first resistance heating element in selected pulse durations separated by at least one selected interval duration and at a frequency between 0.001 and 5000 Hertz; an electric power source and an apparatus circuit including the first resistance heating element and the sealing bar moving mechanism.