초록 ▼

An apparatus and method for monitoring the de-watering performance of a forming section of a papermaking machine is disclosed which includes a laser instrument having a laser displacement meter laterally spaced and supported above an upper run of a paper forming fabric having a paper stock deposited

An apparatus and method for monitoring the de-watering performance of a forming section of a papermaking machine is disclosed which includes a laser instrument having a laser displacement meter laterally spaced and supported above an upper run of a paper forming fabric having a paper stock deposited thereon. A head box deposits paper stock consisting of a water/fiber mixture on top of the upper run. An adjustable C-shaped carrier stand has an upper leg that supports the laser instrument above the upper run of the forming fabric. The carrier stand has a lower leg to support a baseline contact device below the upper run of the forming fabric. The laser displacement meter is disposed at a laser reference position above the forming fabric so that a laser beam is reflected off of the paper stock which is deposited on top of the forming fabric. The baseline device is disposed at a baseline reference position below said forming fabric so that a first distance between the laser reference and the baseline reference can be measured. The laser meter generates a signal representing a second distance of the top surface of the paper stock from the laser referencec. A controller receives the signal and processes an output value indicating the thickness of the paper stock, having the first distance and the thickness of the forming fabric, and hence the water content of the paper stock is monitored.

대표청구항 ▼

An apparatus for monitoring the de-watering performance of a forming section of a papermaking machine, said forming section including an associated structure having a side frame and an endless paper forming fabric which travels about a plurality of rolls; said paper forming fabric having an upper ho

An apparatus for monitoring the de-watering performance of a forming section of a papermaking machine, said forming section including an associated structure having a side frame and an endless paper forming fabric which travels about a plurality of rolls; said paper forming fabric having an upper horizontal run, a head box for depositing paper stock consisting of a water/fiber mixture on top of said upper horizontal run of said forming fabric; a plurality of de-watering mechanisms disposed sequentially underneath said fabric along said upper horizontal run of said fabric for removing water from said stock; wherein said apparatus comprises: a carrier stand having a pair of spaced apart legs including a top leg and a bottom leg for being positioned above and below said horizontal run of said fabric, respectively; a laser instrument carried by said top leg portion of said carrier stand and having a laser beam; a baseline contact device carried by said bottom leg portion of said carrier stand for contacting a bottom surface of said horizontal run of said fabric to establish a baseline reference a first distance directly below said laser instrument; said carrier stand positioning said laser instrument above said upper horizontal run of said forming fabric so that said laser beam is reflected from a top horizontal surface of said paper stock and said carrier stand supporting said baseline device which contacts said bottom surface of said upper horizontal run of said forming fabric which is devoid of said paper stock; said laser instrument including a laser displacement meter having a receiver for receiving said reflected laser beam of said laser meter and generating a signal corresponding to said reflected laser beam and distance to said upper run of said fabric; and a controller for receiving said signal and for computing and generating an output representative of a thickness of said paper stock, and hence the relative water content of said stock, based on said signal and said baseline reference.