Claims
- 1. On line apparatus for periodic testing of the length of fibers in paper stock or pulp, while undiluted and at operating consistency in a pressurized line of a paper making system, said apparatus comprising:
- an upstanding stock container having a lower end connected to a supply of said paper stock or pulp flowing in said pressurized line of said paper making system at operating consistency, undiluted, and of predetermined, relative fiber length, a stock chamber, having a lower portion and an upper portion, said lower end incorporating said lower portion of said stock chamber into said pressurized line of said paper making system and having liquid level sensing means within the upper portion of said chamber for sensing the time of arrival of stock levels therein;
- an orifice plate mounted across said chamber to divide said chamber into said upper and lower portions, said plate being imperforate except for rimming around at least one circular orifice and up to about five identical said orifices each of predetermined diameter, substantially equal to the said predetermined relative length of the fibers in said stock, each said orifice being in the range of about one to twenty millimeters in diameter;
- automatic control means, operably connected to said container for periodically cycling said chamber through intake, measure and exhaust;
- means for periodically, instantaneously generating a signal representing relative fiber length in stock or pulp flowing through said pressurized pipe line;
- and automatic timing means connected to said liquid level sensing means and to said means for generating a signal for displaying the value of stock accumulation in said upper portion of said chamber during a pre-set period of time.
- 2. Apparatus as specified in claim 1 wherein:
- the orifice in each said orifice plate is of diameter of about five to twenty millimeters for rag fibers suitable for roofing felt base or unrefined rag fibers.
- 3. Apparatus as specified in claim 1 wherein:
- said orifice plate includes four of said circular orifices to average out the passage of fibers through said orifice plate into the upper portion of said chamber.
- 4. Apparatus as specified in claim 1 wherein:
- said orifice plate includes camera shutter type mechanism for adjusting the size of said orifice and means for actuating said mechanism from outside said apparatus.
- 5. Apparatus as specified in claim 1 wherein:
- each said orifice is substantially a cylindrical tube in configuration.
- 6. Apparatus as specified in claim 1 wherein:
- said automatic control means includes means for establishing a predetermined pressure differential between the pressure of stock supplied to the lower end of said container and pressure within the upper portion of said stock chamber;
- whereby orifice size constitutes coarse adjustment while differential pressure constitutes fine adjustment of said apparatus.
- 7. Apparatus as specified in claim 1 wherein:
- said apparatus includes means for maintaining a differential pressure, in said stock chamber of about 0.5 to 1.5 p.s.i.
- 8. Apparatus as specified in claim 1 wherein:
- the orifice in said orifice plate is of a diameter of about one to two millimeters for highly refined flax pulp suitable for cigarette tissue.
- 9. On line apparatus for periodic testing of the length of fibers in paper stock or pulp flowing in a paper making system while pressurized, undiluted and at paper making consistencies, and of predetermined relative length said apparatus comprising:
- an upstanding container having a lower end connected into said paper making system to receive said stock, or pulp, at operating consistency, pressurized, undiluted, and of predetermined relative fiber length the interior of said container being thereby incorporated into said paper making system;
- an orifice plate mounted across the interior of said container, intermediate of the height thereof to form a measuring chamber thereabove, said plate being imperforate except for at least one orifice therethrough and up to about five identical said orifices therethrough each with a rim extending therearound, each said orifice being circular in configuration and of predetermined area with a diameter substantially equal to the predetermined relative length of said stock, or pulp, in said system, the diameter of said circular orifice being in the range between 1 mm and 20 mm;
- liquid level sensing means in said measurement chamber for sensing liquid level reached therein by said undiluted stock, or pulp, at operating consistency;
- automatic control means including a cycle timer operably connected to said measurement chamber for periodically cycling said chamber through intake, measure and exhaust, and establishing a set intake time for said predetermined relative fiber length;
- means for periodically and instantaneously generating a signal representing relative fiber length in stock, or pulp, in said paper stock, or pulp system;
- said control means including said means for generating a signal for signalling fiber length sensed during each said cycle.
- 10. Apparatus as specified in claim 9 wherein:
- each said circular orifice is substantially tubular cylindrical in configuration.
- 11. Aparatus as specified in claim 9 wherein:
- there are four orifices in said orifice plate for averaging out the testing of the fiber length measurement results.
- 12. Apparatus as specified in claim 9 wherein:
- said automatic control means includes means for establishing a differential pressure across each orifice within the range of 0.5 to 1.5 psi.
- 13. Apparatus as specified in claim 9 wherein:
- said container includes a dump valve operably connected to said measurement chamber for discharging the contents thereof; and
- said automatic control means includes means for actuating said dump valve during said exhaust cycle;
- wherein the contents of said chamber are not discharged back through said orifice during exhaust.
- 14. Apparatus as specified in claim 9 wherein:
- said container includes a flushing conduit mounted to direct a flushing stream of liquid across said plate to free said orifice of fibers collected thereon; and
- liquid supply means, forming part of said aromatic control means, for automatically flushing each said orifice during the exhaust cycle.
- 15. The on line method of automatically, periodically testing the length of fibers in refined, or unrefined, paper fiber slurry while in a paper making system and while pressurized, undiluted at operating consistencies and of predetermined relative fiber length, by means of a standpipe connected into said system, the standpipe having an orifice plate extending across the interior thereof with at least one circular orifice therein, and obtaining an instantaneous read out of said fiber length, said method comprising the steps of:
- selecting as said plate of imperforate material having at least one circular orifice and up to about five identical said orifices, each of predetermined area and diameter substantially equal to the predetermined relative length of the fibers in said system, said diameter being in the range of 1 mm to 20 mm;
- connecting said standpipe on line into said system for an intake, measure and exhaust cycle wherein said slurry must pass from said system through said circular orifice into a measurement chamber;
- establishing a set intake time for measurement in said chamber for the said predetermined relative length of fibers;
- measuring during each intake cycle, in comparison with said set intake time, whether said slurry passes through said orifice into said measurement chamber, in a predetermined volume or to a predetermined height therein;
- and periodically, instantaneously generating a signal representing the relative fiber length in said slurry.
- 16. The on line method of automatically and periodically monitoring the relative length of fiber in refined paper stock, or in unrefined paper pulp, while at operating consistency, undiluted, and while pressurized in the paper making system, by means of a container connected into said system and having an orifice plate with a circular orifice therein, a measurement chamber and liquid level sensing means in said chamber which comprises the steps of:
- selecting an orifice plate of imperforate material with from one to five identical circular orifices each having a diameter in the range of 1 mm to 20 mm which diameter is substantially equal to the predetermined relative length of fiber;
- periodically and automatically cycling said measurement chamber through intake, measure and discharge to enable said undiluted stock, or pulp, at operating consistency to pass through said circular orifice from said paper making system into said chamber and contact said liquid level sensing means;
- and periodically, instantaneously indicating, in response to said liquid level sensing means, at the end of said intake cycle, whether or not, fibers of said predetermined relative length have been sensed thereby.
- 17. On line apparatus for controlling the quality of paper stock discharged from stock refiners, said apparatus comprising:
- a paper stock supply system containing pressurized, undiluted stock at normal operating consistency and including a stock refiner having a pair of members rotatably movable relative to each other;
- means for driving one of said members with respect to the other member;
- means for changing the refining effect of said refiner;
- on line fiber length indicating means connected into said stock supply system for periodically measuring the relative length of the fibers in the stock passing through said system, said means including a plate of imperforate material having a substantially cylindrical aperture with a diameter in the range of 1 mm to 20 mm and substantially equal to the predetermined relative length of fibers to be refined, means for sensing the time of passage of stock through said aperture as compared to a predetermined time interval;
- means for periodically, instantaneously generating a signal representing relative fiber length in said stock;
- and control means for operatively connecting said sensing means, said means for generating a signal, and said measuring means with said means for changing the refining effect of said refiner to compensate for any variations of length of fiber supplied thereto with the predetermined relative length of fiber supplied thereto.
- 18. Apparatus as specified in claim 17 wherein:
- said system also includes an on line freeness tester, said on line freeness tester and said on line fiber length indicating means, being connected into a paper line of said stock supply system, and jointly operatively connected to said means for changing the refining effect of said refiner to automatically continuously and instantaneously control both freeness and fiber length of the refined product of said system.
- 19. Apparatus for periodic testing of the length of fibers in paper stock or pulp in a supply thereof of predetermined relative fiber length, said apparatus comprising:
- an upstanding stock container having a lower end connected to said supply of paper stock, or pulp, of predetermined relative fiber length, a stock chamber having a lower portion and an upper portion, liquid level sensing means within the upper portion of said chamber for sensing the time of arrival of stock levels therein;
- an orifice plate mounted across said chamber to divide said chamber into said upper and lower portions, said plate being imperforate except for having one to five identical, circular orifices therethrough, each of predetermined diameter equal to the said predetermined relative length of the fibers in said stock or pulp, each said identical circular orifice having an identical diameter in the range of, one to twenty millimeters;
- automatic control means, operably connected to said container for periodically cycling said chamber through intake measure and exhaust of said stock or pulp;
- means for periodically, instantaneously generating a signal representing relative fiber length in said stock or pulp in said supply;
- and automatic timing means connected to said liquid level sensing means and to said means for generating a signal for displaying the value of stock accumulation in said upper portion of said chamber during a pre-set period of time.
RELATED APPLICATION
This application is a continuation of my application Ser. No. 361,300 filed Mar. 14, 1982, entitled "FIBER LENGTH INDICATING APPARATUS AND METHOD", now abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
Country |
Parent |
361300 |
Mar 1982 |
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