Thermal Bonding Device with Isolated Heating Box
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Solution Overview
Problem
Existing methods for thermally bonding flexible coverings to supports face challenges such as inefficient heating, increased energy consumption, and poor working conditions due to the use of hot gas for fluidizing particles and activating adhesives, leading to longer activation times and unnecessary thermal energy dissipation.
Innovation Solution
A device with a central heating box that isolates heating elements within a fluidized bed, allowing for rapid temperature increase while maintaining energy efficiency, using electrical resistors and programmable controllers to regulate temperature and gas flow, and a method that involves separate gas feed systems for the heating box and enclosure to optimize bonding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a stream of hot gas is used to fluidize the bed of particles and activate the adhesive, then the adhesive activation temperature can be reached, but the activation time increases substantially and energy is needlessly dissipated
Solution Approach 1:
The device divides the enclosure into a heating box and a peripheral zone, with separate gas feed systems for each. The heating box receives hot gas at a higher flow rate to rapidly activate the adhesive, while the peripheral zone receives cooler gas to maintain fluidization without excessive heating. This segmentation allows differential temperature control to resolve the contradiction between achieving activation temperature and minimizing activation time.
Solution Approach 2:
The invention applies different gas temperatures and flow rates to different spatial zones: the heating box receives high-temperature, high-flow gas for rapid adhesive activation, while the peripheral zone receives lower-temperature gas for maintenance fluidization. This local quality differentiation enables the system to achieve rapid activation in the critical area without unnecessarily heating the entire enclosure, thus reducing both activation time and energy dissipation.
2Stability of the object's composition
If the stream of hot gas is maintained to keep the bed fluidised, then the bed remains fluidised, but the covering and support accumulate thermal energy that slows down the crosslinking phase and increases energy waste
Solution Approach 1:
The gas feed system is segmented into two independent circuits: one for the heating box and one for the peripheral zone. This allows the system to maintain bed fluidisation in the peripheral zone with cooler gas while applying intense heating only in the heating box during activation, thereby maintaining fluidisation stability without excessive energy dissipation across the entire system.
Solution Approach 2:
The gas flow rate is varied periodically between activation phase and crosslinking phase. During activation, high gas flow provides rapid heating. During crosslinking, the gas flow is reduced or modulated to prevent excessive thermal accumulation that would slow down the crosslinking reaction, thus reducing energy waste while maintaining bed fluidisation.
3Productivity
If the stream of hot gas is kept activated during breaks in production, then the device can be quickly restarted, but the ambient temperature of the workshop rises and working conditions deteriorate
Solution Approach 1:
The heating box is thermally isolated from the peripheral zone, allowing the heating box to be maintained at high temperature for quick restart while the peripheral zone and workshop environment remain cooler. The separate gas feed systems enable independent temperature control, so the harmful thermal effect is confined to the small heating box volume rather than propagating throughout the entire workshop.
Solution Approach 2:
The high-temperature heating function is extracted and isolated into a separate heating box, physically and thermally separated from the main enclosure and workshop environment. This allows the heating box to be kept hot for rapid restart without necessarily heating the entire workshop, thus maintaining productivity readiness while minimizing the harmful thermal effect on working conditions.
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 solution enables rapid adhesive activation with reduced energy consumption, improved bond quality, and enhanced working conditions by maintaining high temperatures only where needed, resulting in increased productivity and energy savings while preventing thermal runaway.
Implementation Method 1
an enclosure for a bed of particles fluidised by a stream of gas
Implementation Method 2
said heating box further comprising heating means suitable for being placed in the bed of particles
Implementation Method 3
a compression member capable of pressing the support against the fluidised bed
Data Source
AI summary
A device for the thermal bonding of a flexible covering (13) to a support (12), using a fluidized bed of particles (4), includes an internal zone, called a heating box (10) smaller in size than that of the enclosure (2), which is placed approximately at the center of the latter, the heating box having a gas distributor (6b), a diffusion mesh (7b) and a gas feed system (5b, 9) that are separate and isolated from those of the enclosure, and heating elements (11) designed to be placed in the particle bed. A thermal bonding method suitable for being implemented by this device is also described.