A system and method for applying adhesive glues is provided using digital inkjet print heads for bonding at least one first element and one second element, wherein the system has a processing unit functionally connected to the digital inkjet print head which has a data set about the physical features of at least one of the elements to be bonded which are different in different areas, the processing unit being adapted for selecting the amount of adhesive glue per unit area and/or the type of adhesive glue to be deposited according to the data about the physical features such that the amount per unit area or the type of adhesive glue deposited on the surface is different on the surface of the at least one of the elements to be bonded.

A system and method for applying adhesive glues is provided using digital inkjet print heads for bonding at least one first element and one second element, wherein the system has a processing unit functionally connected to the digital inkjet print head which has a data set about the physical features of at least one of the elements to be bonded which are different in different areas, the processing unit being adapted for selecting the amount of adhesive glue per unit area and/or the type of adhesive glue to be deposited according to the data about the physical features such that the amount per unit area or the type of adhesive glue deposited on the surface is different on the surface of the at least one of the elements to be bonded.

A system and method for applying adhesive glues is provided using digital inkjet print heads for bonding at least one first element and one second element, wherein the system has a processing unit functionally connected to the digital inkjet print head which has a data set about the physical features of at least one of the elements to be bonded which are different in different areas, the processing unit being adapted for selecting the amount of adhesive glue per unit area and/or the type of adhesive glue to be deposited according to the data about the physical features such that the amount per unit area or the type of adhesive glue deposited on the surface is different on the surface of the at least one of the elements to be bonded.

A system and method for applying adhesive glues is provided using digital inkjet print heads for bonding at least one first element and one second element, wherein the system has a processing unit functionally connected to the digital inkjet print head which has a data set about the physical features of at least one of the elements to be bonded which are different in different areas, the processing unit being adapted for selecting the amount of adhesive glue per unit area and/or the type of adhesive glue to be deposited according to the data about the physical features such that the amount per unit area or the type of adhesive glue deposited on the surface is different on the surface of the at least one of the elements to be bonded.

A method for forming at least one plurality of printed dots on a surface, with help of at least one plurality of drops generated by a printhead of a continuous inkjet printer. The method comprises, for each plurality of printed dots: deciding, whether all drops of the at least one plurality of drops are protected from perturbations due to the air resistance or whether at least one drop of the at least one plurality of drops is not protected from the perturbations; generating and charging each drop of the at least one plurality of drops according to whether it is protected from the perturbations or not protected from the perturbations; and printing the at least one plurality of drops on the surface.

A method for forming at least one plurality of printed dots on a surface, with help of at least one plurality of drops generated by a printhead of a continuous inkjet printer. The method comprises, for each plurality of printed dots: deciding, whether all drops of the at least one plurality of drops are protected from perturbations due to the air resistance or whether at least one drop of the at least one plurality of drops is not protected from the perturbations; generating and charging each drop of the at least one plurality of drops according to whether it is protected from the perturbations or not protected from the perturbations; and printing the at least one plurality of drops on the surface.

A printed graphical code has H lines and a W columns i (i=1, . . . W) and a pattern of H×W cells, each at the intersection of a column and a line. Each cell or dot is formed with a drop from a printhead of a continuous inkjet printer and two successive dots of a column are separated by at least one non printed cell. A method for printing each column comprises: retrieving or selecting charges to be applied to each drop for printing the dots of the column from a set of data or database of charges for each of a number of configurations of drops to be printed, the number being equal to or less than 2.sup.(H/2)+1 if H is an even number or equal to or less than 2.sup.((H+1)/2)+1 if H is an odd number; charging the drops for printing according to the retrieved charges; and printing the column.

A printed graphical code has H lines and a W columns i (i=1, . . . W) and a pattern of H×W cells, each at the intersection of a column and a line. Each cell or dot is formed with a drop from a printhead of a continuous inkjet printer and two successive dots of a column are separated by at least one non printed cell. A method for printing each column comprises: retrieving or selecting charges to be applied to each drop for printing the dots of the column from a set of data or database of charges for each of a number of configurations of drops to be printed, the number being equal to or less than 2.sup.(H/2)+1 if H is an even number or equal to or less than 2.sup.((H+1)/2)+1 if H is an odd number; charging the drops for printing according to the retrieved charges; and printing the column.

An image forming apparatus includes (a) recording heads, (b) an optical detection part that emits light, receives reflected light reflected on a recording medium, and generates a sensor output in correspondence with the reflected light, (c) a medium information acquisition processing part that sets a pattern image formation position where a test pattern image is formed on the recording medium based on reflection characteristics, the reflection characteristics being obtained from the sensor output of the optical detection part, (d) a pattern image formation processing part that forms the test pattern image at the pattern image formation position using the recording heads, (e) a pattern image detection processing part that detects the test pattern image at the pattern image formation position using the optical detection part, generating a detection result, and (f) an image forming condition setting part that sets an image forming condition based on the detection result.

An image forming apparatus includes (a) recording heads, (b) an optical detection part that emits light, receives reflected light reflected on a recording medium, and generates a sensor output in correspondence with the reflected light, (c) a medium information acquisition processing part that sets a pattern image formation position where a test pattern image is formed on the recording medium based on reflection characteristics, the reflection characteristics being obtained from the sensor output of the optical detection part, (d) a pattern image formation processing part that forms the test pattern image at the pattern image formation position using the recording heads, (e) a pattern image detection processing part that detects the test pattern image at the pattern image formation position using the optical detection part, generating a detection result, and (f) an image forming condition setting part that sets an image forming condition based on the detection result.