An apparatus, comprising: a sealing band apparatus having a first terminal connected to a direct current input and a second terminal, wherein a meltable material placed between the first and second terminals (84A, 84B) of the sealing band apparatus is melted by resistance of current flowing between the first and second terminals (84A, 84B) of the sealing band apparatus; and a voltage measurement device, wherein said voltage measurement device measures a voltage drop between the first and second terminals (84A, 84B) of the sealing band apparatus, characterized in that the apparatus further comprises: a reference resistor, wherein the reference resistor is powered by said direct current input; an op-amp, wherein a first terminal of said op-amp is connected to a variable voltage source, and wherein a second terminal of said op-amp is connected to said reference resistor; and a transistor with a base connection, an emitter connection, and a collector connection, wherein said base connection is connected to an output of said op-amp, wherein said emitter connection is connected to said reference resistor, and wherein said collector connection is connected to the first terminal of the sealing band apparatus and allows for a constant current to flow to the first terminal of the sealing band apparatus, and in that said variable voltage source changes voltage based on said voltage drop measured by said voltage measurement device and said constant current. a sealing band apparatus having a first terminal connected to a direct current input and a second terminal, wherein a meltable material placed between the first and second terminals (84A, 84B) of the sealing band apparatus is melted by resistance of current flowing between the first and second terminals (84A, 84B) of the sealing band apparatus; and a voltage measurement device, wherein said voltage measurement device measures a voltage drop between the first and second terminals (84A, 84B) of the sealing band apparatus, characterized in that the apparatus further comprises: a reference resistor, wherein the reference resistor is powered by said direct current input; an op-amp, wherein a first terminal of said op-amp is connected to a variable voltage source, and wherein a second terminal of said op-amp is connected to said reference resistor; and a transistor with a base connection, an emitter connection, and a collector connection, wherein said base connection is connected to an output of said op-amp, wherein said emitter connection is connected to said reference resistor, and wherein said collector connection is connected to the first terminal of the sealing band apparatus and allows for a constant current to flow to the first terminal of the sealing band apparatus, a reference resistor, wherein the reference resistor is powered by said direct current input; an op-amp, wherein a first terminal of said op-amp is connected to a variable voltage source, and wherein a second terminal of said op-amp is connected to said reference resistor; and a transistor with a base connection, an emitter connection, and a collector connection, wherein said base connection is connected to an output of said op-amp, wherein said emitter connection is connected to said reference resistor, and wherein said collector connection is connected to the first terminal of the sealing band apparatus and allows for a constant current to flow to the first terminal of the sealing band apparatus, and in that said variable voltage source changes voltage based on said voltage drop measured by said voltage measurement device and said constant current.