Temperature controlled polymer composition for inductive control heating using electrical conductive and magnetic particles
View Patent ↗A polymer composition with a polymer matrix material and magnetic particles. The composition is selectively electro-magnetically heatable by an electrical induction energy frequency that is pulse width modulated through variable time cycles to provide controlled heating.
1. A method for controlled temperature bonding with a polymer composition comprising magnetic particles dispersed in a polymer matrix material, the method comprising the steps of:
generating electromagnetic induction energy having an electromagnetic induction energy frequency selected from the range of 80 kHz to 30 MHz;
pulse width modulating the electromagnetic induction energy to generate a first pulse width modulated electromagnetic energy having a pulse width modulation frequency and a first duty cycle selected from a plurality of duty cycles;
heating the polymer composition with the first pulse width modulated electromagnetic induction energy for a first heating interval;
pulse width modulating the electromagnetic induction energy to generate a second pulse width modulated electromagnetic induction energy having the pulse width modulation frequency and a second duty cycle selected from the plurality of duty cycles; and
heating the polymer composition with the second pulse width modulated electromagnetic induction energy for a second heating interval.
2. The method according to claim 1 , wherein the polymer composition further comprises electrically conductive particles dispersed in the polymer matrix material.
3. The method according to claim 2 , wherein the electrically conductive and magnetic particles are evenly distributed in the polymer matrix material.
4. The method according to claim 1 , wherein the plurality of duty cycles range from 0-100%.
5. The method according to claim 1 , further comprising the steps of:
disposing the polymer composition between a first component and a second component; and
fusing the first component to the second component with the polymer composition.
6. The method according to claim 5 , wherein:
the first component comprises one of:
a first thermoplastic material; and
a first thermoset material; and
the second component comprises one of:
a second thermoplastic material; and
a second thermoset material.
7. The method of claim 1 , wherein the first duty cycle and the second duty cycle are different.
8. The method of claim 1 , wherein the first heating interval and the second heating interval are different.