Cellulosic Insecticide Mat Sustained Release via Low-Temperature Heating
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Solution Overview
Problem
Sustained release of insecticides from cellulosic compositions using heat is typically short, lasting several hours instead of several days, and existing solutions are complex and often require high temperatures, leading to inefficiencies and potential degradation of active ingredients.
Innovation Solution
A method involving a cellulosic dosage unit with insecticidal active substances like transfluthrin or metofluthrin, heated within the range of 60°C to 95°C, forming a mat that prolongs the release duration to over a week, using a simpler approach with reduced active agent concentrations and avoiding high temperatures to prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high temperature heating is used to enhance insecticide release rate, then the release speed is improved, but the duration of action is reduced and active ingredient degradation occurs
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (>130°C) to a lower range (60-95°C). This parameter modification allows the insecticide to be released at a controlled pace over an extended period of several days to weeks, rather than rapidly depleting the active ingredient. The lower temperature prevents thermal degradation of the active ingredient while maintaining sufficient release rate for effective insect control.
2Reliability
If complex measures are used to prevent untimely release at high temperature, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the complex preventive measures (such as impermeable layers with apertures, metal layers, or specialized carrier members) that were previously used to control release at high temperatures. By operating at lower temperatures (60-95°C), the invention eliminates the need for these additional protective structures, achieving reliable control of untimely release through temperature management alone, thus simplifying the overall device design.
3Duration of action of moving object
If liquid formulations are used in heated devices, then the sustained release performance is improved, but leakage and solvent evaporation problems occur
Solution Approach 1:
The patent employs a solid cellulosic dosage unit that is disposable and does not require liquid formulations. The solid format eliminates the harmful effects of liquid formulations including leakage and solvent evaporation. The cellulosic matrix holds the insecticide and releases it through controlled evaporation of the insecticide itself at low temperatures, providing sustained release without the drawbacks of liquid-based systems.
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
Achieves a prolonged insecticide release duration of up to six weeks with significantly lower active agent concentrations, reducing waste and maintaining ingredient stability, while avoiding the drawbacks of liquid formulations like leakage and solvent evaporation.
Implementation Method 1
heating the dosage unit by means of a heater so as to evaporate the active substance into the environment
Data Source
AI summary
Disclosed is a method for effecting the sustained release of an insecticidal active agent, employing cellulosic mat technology and existing heating equipment, wherein the method comprises heating the mat, by means of a heater, at a temperature selected to be within the range of from 60º C to 95º C. To this end, the active substance is selected from the group consisting of transfluthrin, metofluthrin, and mixtures thereof