Apparatus, system, and process for determining characteristics of a surface of a papermaking fabric
Apparatuses, processes, and systems for determining features of a paper-making fabric. The apparatus, processes, and systems utilize a representation of a portion of a surface of the fabric, with the representation showing locations and sizes of knuckles and pockets in the surface of the fabric. An image of the portion of the fabric is generated based on the representation. Using the displayed image, an outline is drawn around at least one of the knuckles, and guidelines are drawn such that the guidelines pass through the center of the outlined knuckle, pass through the other knuckles, and form a shape that surrounds areas of the image that correspond to where the pockets are formed between the knuckles. With the outlined knuckle and guidelines, properties that affect the paper-making functionality of the fabric may be calculated.
1. A process of determining features of a fabric, the process comprising:
forming a representation of a portion of a surface of the fabric, the representation showing locations and sizes of knuckles and pockets in the surface of the fabric;
generating an image of the portion of the surface of the fabric based on the representation;
displaying at least a portion of the image on a screen associated with a computer having a processor;
drawing an outline around at least one of the knuckles in the displayed image;
drawing guidelines in the displayed image such that the guidelines (i) pass through the center of the outlined knuckle, (ii) pass through the other knuckles, and (iii) form shapes that surround areas of the image that correspond to where the pockets are formed between the knuckles, the shapes being non-rectangular parallelograms, wherein the outline and the guidelines are drawn using an image analysis program stored in a non-transitory computer-readable medium;
a step of determining at least one of (i) a length of the outlined knuckle, (ii) a width of the outlined knuckle, (iii) orientation angles of the guidelines, and (iv) locations of the knuckles along the guidelines, wherein the determining step is performed by the image analysis program; and
calculating at least one of (i) a percentage of the surface of the fabric that corresponds to the knuckles and (ii) a density of the pockets, wherein the calculating step uses the determinations of the length of the outlined knuckle, the width of the outlined knuckle, the orientation angle of the guidelines, locations of the knuckles along the guidelines, and a calculated area of at least one of the parallelograms.
2. The process according to claim 1 , wherein the calculated area of the at least one of the parallelograms is calculated using an angle of one corner of the parallelogram and a distance between two parallel guidelines of guidelines that form the parallelogram.
3. The process according to claim 1 , wherein the representation is formed by one of (i) pressing the fabric against a pressure measurement film, (ii) taking a photograph of the fabric, and (iii) pressing the fabric against wax paper.
4. A process of determining features of a fabric, the process comprising:
forming a representation of a portion of a surface of the fabric, the representation showing locations and sizes of knuckles and pockets in the surface of the fabric, and the representation being one of a print of the surface of the fabric and a photograph of the surface of the fabric;
generating an image of the portion of the surface of the fabric based on the representation;
displaying at least a portion of the image on a screen associated with a computer having a processor;
determining the sizes and locations of the knuckles in the displayed image;
determining the sizes and locations of the pockets in the displayed image;
drawing a unit cell for the portion of the surface of the fabric in the displayed image, wherein the unit cell is defined by guidelines that (i) pass through the centers of the knuckles and (ii) form shapes that surround areas of the image that correspond to where the pockets are formed between the knuckles; and
calculating at least one property of the surface of the fabric based on properties of the unit cell formed by the guidelines,
wherein the unit cell and the guidelines are drawn using an image analysis program stored in a non-transitory computer-readable medium.
5. The process according to claim 4 , wherein the shapes are non-rectangular, parallelograms.
6. The process according to claim 5 , wherein the calculating step includes a step of calculating at least one of a percentage of the surface of the fabric that corresponds to the knuckles and a density of the pockets, and
wherein the calculating step uses the sizes of the knuckles along the guidelines and an area of the parallelograms.
7. The process according to claim 6 , wherein the area of the parallelograms is calculated using an angle of one corner of the parallelograms and a distance between two parallel guidelines of guidelines that form the parallelograms.