Glue delivery system

A method of extruding glue from a glue holding container through first and second glue applicators of a glue delivery system onto a moving substrate, the method comprising the steps of:

• applying to a pump a predetermined gear reducer ratio at a constant torque, current, speed and position;
• extruding a controlled amount of the glue from the glue holding container through a first hose to a first glue chamber and to a gun of the first glue applicator and through the gun to a leading edge of the moving substrate that is placed in a leading edge pad of an applicator drum;
• and
• extruding the controlled amount of the glue from the glue holding container through a second hose to a second glue chamber and to a nozzle of the second glue applicator and a trailing edge of the moving substrate placed in a trailing edge pad of the applicator drum being blown off over to the nozzle to receive a smear of glue on the trailing edge of the moving substrate;
• wherein the predetermined gear reducer ratio is based on empirical correlations of gear reducer ratios applied to a calibrated glue, speed of the moving substrate onto which the calibrated glue is extruded and an amount of the calibrated glue during an empirical data acquisition process performed independently of the extruding steps;
• wherein when a glue pressure drops due to the extrusion of glue onto the moving substrate the torque and current drops and the gear reducer ratio of the pump is changed to maintain a required torque and current on a main motor shaft, the glue pressure drop is measured and modulates the glue pressure based upon a differential between the changed gear reducer ratio and the predetermined gear reducer ratio thereby achieving a precise pressure related to volume of a glue deposition and speed of the moving substrate onto which the glue is applied during the extruding steps.

A method of extruding glue from a glue holding container through a glue applicator of a glue delivery system onto a moving substrate, the method comprising the steps of:

• applying to a pump a predetermined gear reducer ratio at a constant torque, current, speed;
• extruding a controlled amount of the glue from the glue holding container through a hose to a glue chamber and to a gun of the glue applicator and through the gun to a leading edge of the moving substrate that is placed in a leading edge pad of an applicator drum;
• and
• whereby when a glue pressure drops due to the extrusion of glue onto the moving substrate the torque and current drops and a gear reducer ratio of the pump is changed to maintain a required torque and current on a main motor shaft, the glue pressure drop is measured and modulates the glue pressure based upon a differential between the changed gear reducer ratio and the predetermined gear reducer ratio thereby achieving a precise pressure related to volume of a glue deposition and speed of the moving substrate onto which the glue is applied during the extruding steps;
• wherein the predetermined gear reducer ratio is based on empirical correlations of gear reducer ratios applied to a calibrated glue, speed of the moving substrate onto which the calibrated glue is extruded and an amount of the calibrated glue during an empirical data acquisition process;
• and
• wherein the data matrix is created by recording data during the empirical data acquisition process representative of a measured amount of the calibration glue deposited onto the moving substrate, on information relating to the signal indicating the glue pressure drop, a torque and current empirical data and a gear reducer ratio empirical data and a speed of movement of the substrate relative to the applicator drum.