Foamed Ear Plug Detection Body Suspension via Thermal Insertion
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Solution Overview
Problem
Existing methods for incorporating detection bodies into foam plastic earplugs often result in inhomogeneous placement, difficulty inserting the earplug due to particle weight or surface contact, and additional processing steps, leading to detection challenges and potential user irritation.
Innovation Solution
Heating the detection body above the foaming temperature allows it to sink into the foam plastic, creating a stable pore structure that keeps it suspended, eliminating the need for an insertion channel and ensuring homogeneous placement, with controlled temperature and timing to maintain distance from the insertion end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a detection body is introduced into the foam by punching a cavity or shooting with kinetic energy, then the detection body can be placed in the earplug, but the foam structure becomes inhomogeneous and the detection body is not homogeneously surrounded by the foam
Solution Approach 1:
The patent changes the temperature parameter of the detection body, heating it to above the foaming temperature of the plastic. This temperature change causes the plastic around the detection body to foam and solidify quickly, suspending the detection body in a homogeneous position within the foam structure without creating inhomogeneities from mechanical punching or shooting.
2Quantity of substance
If very small detectable particles are introduced into the foam mass during foaming, then the particles are distributed in the foam plastic, but the particles collect in the insertion end due to weight and make insertion difficult
Solution Approach 1:
The patent replaces the mechanical distribution method (introducing particles during foaming) with a thermal field method. By heating the detection body to above the foaming temperature, the body sinks into the foam and becomes suspended in the interior, preventing gravitational settling at the insertion end and ensuring easy insertion.
3Ease of manufacture
If a channel is formed into the earplug after foaming to introduce the detection body, then the detection body can be inserted, but an additional processing step is required and the channel may clog due to foam rebound
Solution Approach 1:
The patent performs the detection body introduction during the foaming process itself, before the foam solidifies. The heated detection body is introduced into the molten foam, where it sinks and becomes suspended. This eliminates the need for subsequent channel formation and avoids the problem of channel clogging from foam rebound.
4Reliability
If detectable particles are introduced into the foam mass, then detection is possible, but the particles may come into contact with the user's skin and cause irritation
Solution Approach 1:
The patent replaces mechanical particle distribution with thermal field-based suspension. The heated detection body sinks into the foam and is suspended in the interior by the solidifying foam structure, ensuring it remains embedded and does not come into contact with the user's skin, thereby eliminating irritation while maintaining detection capability.
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 ensures a detection body is homogeneously surrounded by foam, preventing loss and skin contact, while allowing easy earplug insertion, enhancing detection reliability and user safety.
Implementation Method 1
the plastic immediately surrounding the detection body when sinking into the foaming plastic is brought to a higher temperature level by heat emission from the detection body
Implementation Method 2
which causes the foaming and the in the foam polymerization taking place can be accelerated
Data Source
AI summary
The invention relates to a method for manufacturing a foam earplug containing a detection element. The detection element is heated before being embedded in the foam. The insertion depth of the detection element can be determined by appropriately selecting its temperature and the timing of its insertion.