Method of and apparatus for controlling application of glue to defined areas

Apparatus for applying adhesive to flutes of a plurality of corrugated webs, comprising a plurality of adhesive applicator rolls;

• means for transferring adhesive to peripheries of said applicator rolls;
• means for moving the webs in unison and at the same speed of travel so that each web moves across the periphery of an associated one of said applicator rolls with its flutes against said periphery for transfer of adhesive from said periphery to the flutes;
• means for sensing the actual speed of travel of the webs;
• means responsive to the sensed actual speed of travel of the webs for independently rotating each applicator roll at a rate varied as necessary to maintain constant an individually selected relationship between the peripheral speed of the roll and the speed of travel of its associated web, despite any variations in the speed of travel of the webs, to thereby control the amount and location of adhesive applied onto the flutes of individual ones of the webs;
• a plurality of rotatable weight rolls, each associated with an individual one of said applicator rolls and defining with said applicator rolls nips through which their associated webs pass;
• and means for adjusting the sizes of said nips, said adjusting means including means for detecting the sizes of said nips, means for comparing detected nip sizes with preselected desired sizes and means, responsive to said comparison, for moving said weight and applicator rolls relative to each other to bring said nips to said desired sizes.

Apparatus for adhesively adhering a plurality of corrugated cardboard webs and a facing in overlying relationship to form a composite sheet of cardboard, comprising a plurality of rotatable adhesive applicator rolls, each having a periphery across which an individual associated one of the webs is extendible for transfer of adhesive from said periphery to flutes of the web;

• means for transferring adhesive to said applicator roll peripheries;
• conveyor means downstream of said applicator rolls for receiving the webs and facing, moving the same into overlying adhering relationship, and pulling the webs in unison and at the same speed of travel across said applicator roll peripheries for a transfer of adhesive from said peripheries to the web flutes;
• means for rotating each said applicator roll;
• means for continuously sensing the actual speed of travel of the webs;
• and means, responsive to the sensed actual speed of travel of the webs, for controlling said rotating means to rotate each said applicator roll at a rate of rotation that is independent of the rate of rotation of the other applicator rolls and that is varied as necessary to maintain constant an individually selected and adjustable relationship between the peripheral speed of the roll and the sensed actual speed of travel of the webs, despite any variations in the sensed actual speed of travel of the webs, to thereby control the amount and location of adhesive applied onto the flutes of each individual one of the webs.

Apparatus for adhesively adhering a plurality of corrugated cardboard webs and a facing in overlying relationship to form a composite sheet of cardboard, comprising a plurality of rotatable adhesive applicator rolls, each having a periphery across which an individual one of the webs is extendible for transfer of adhesive from said periphery to flutes of the web;

• means for transferring adhesive to said applicator roll peripheries;
• conveyor means downstream of said applicator rolls for receiving the webs and facing, moving the same into overlying adhering relationship, and pulling the webs across said applicator roll peripheries for a transfer of adhesive from said peripheries to the web flutes;
• means for independently rotating each said applicator roll;
• means for sensing the actual speed of travel of the webs;
• means, responsive to the sensed actual speed of travel of the webs, for controlling said rotating means to independently rotate each said applicator roll at a rate varied as necessary to maintain constant an individually selected relationship between the peripheral speed of the roll and the speed of travel of its associated web, despite any variation in the speed of travel of the webs, to thereby control the amount and location of adhesive applied onto the flutes of individual ones of the webs;
• a plurality of rotatably weight rolls, each associated with an individual one of said applicator rolls and defining with said applicator rolls nips through which their associated webs pass in extending across said applicator roll peripheries;
• and means for adjusting the sizes of said nips, said adjusting means including means for detecting the sizes of said nips, means for comparing detected nip sizes with preselected desired sizes and means, responsive to said comparison, for moving said weight and applicator rolls relative to each other to bring said nips to said desired sizes.

A method of applying adhesive to flutes of a plurality of corrugated webs, comprising the steps of transferring adhesive to peripheries of a plurality of applicator rolls;

• moving the webs in unison and at the same speed of travel such that each web moves across the periphery of a associated one of the applicator rolls with its flutes against the periphery to transfer adhesive from the periphery to the flutes;
• sensing the actual speed of travel of the webs;
• and independently rotating each applicator roll, in accordance with the sensed actual speed of travel of the webs, at a rate varied as necessary to maintain constant an individually selected relationship between the peripheral speed of each roll and the speed of travel of its associated web, despite any variations in the speed of travel of the webs, to thereby control the amount and location of adhesive applied onto the flutes of individual ones of the webs, wherein a plurality of rotatably weight rolls are each associated with an individual one of the applicator rolls and define with the applicator rolls nips through which their associated webs pass, and including the further steps of detecting the sizes of the nips;
• comparing the detected nip sizes with preselected desired sizes;
• and, based upon said comparison step, moving the weight and applicator rolls relative to each other to bring the nips to the desired sizes.