Methods for making glued shale shaker screens

• US 6,669,985 B2
• Filed: 10/19/2001
• Issued: 12/30/2003
• Est. Priority Date: 10/30/1998
• Status: Expired due to Fees

• Current Assignee: Varco I/P Incorporated (NOV, Inc.)
• Original Assignee: Varco I/P Incorporated (NOV, Inc.)
• Inventors: McClung, Guy L. III, Grichar, Charles N., Ward, Kerry, Seyffert, Kenneth W., Schulte, David L. Jr., Adams, Thomas C., Leone, Vincent D., Largent, David W., Walker, Jefrey E.
• Primary Examiner(s): PIANALTO, BERNARD D
• Application Number:
  US10/037,474
• Publication Number:
  US 20020168469A1
• Time in Patent Office: 802 Days
• Field of Search: 427/208.2, 427/261, 427/428, 427/430.1, 427/420, 427/207.1
• US Class Current: 427/207.1
• CPC Class Codes: B01D 2201/188 Multiple filtering elements having filtering areas of different size
• CPC Class Codes: B01D 2201/52 Filter identification means
• CPC Class Codes: B01D 29/012 Making filtering elements making bag, cage, hose, tube, sleeve or like filtering elements B01D29/111
• CPC Class Codes: B01D 29/05 supported
• CPC Class Codes: B01D 29/07 with corrugated, folded or wound filtering sheets
• CPC Class Codes: B01D 29/445 Bar screens
• CPC Class Codes: B01D 29/52 in parallel connection
• CPC Class Codes: B01D 29/72 involving vibrations
• CPC Class Codes: B01D 33/0183 supported
• CPC Class Codes: B01D 33/0376 supported
• CPC Class Codes: B01D 33/0384 with corrugated, folded or wound filtering sheets
• CPC Class Codes: B01D 33/41 in series connection
• CPC Class Codes: B07B 1/00 Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like ash-sifters for domestic stoves or ranges F24B15/007
• CPC Class Codes: B07B 1/46 Constructional details of screens in general; Cleaning or heating of screens
• CPC Class Codes: B07B 1/4618 Manufacturing of screening surfaces
• CPC Class Codes: B07B 1/4627 Repairing of screening surfaces
• CPC Class Codes: B07B 1/4645 Screening surfaces built up of modular elements
• CPC Class Codes: B07B 1/4654 Corrugated Screening surfaces
• CPC Class Codes: B07B 1/4663 Multi-layer screening surfaces
• CPC Class Codes: B07B 1/4672 Woven meshes
• CPC Class Codes: B07B 1/469 : Perforated sheet-like material
• CPC Class Codes: B07B 1/48 : Stretching devices for screens
• CPC Class Codes: B07B 1/49 : stretching more than one screen or screen section by the same or different stretching means
• CPC Class Codes: B07B 2201/02 : Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces
• CPC Class Codes: B07B 2201/04 : Multiple deck screening devices comprising one or more superimposed screens
• CPC Class Codes: B21F 27/005 : Wire network per se
• CPC Class Codes: B32B 2305/38 : Meshes, lattices or nets
• CPC Class Codes: B32B 37/1292 : selectively, e.g. in stripes, in patterns B32B37/0076 takes precedence
• CPC Class Codes: E21B 21/06 : Arrangements for treating drilling fluids outside the borehole
• CPC Class Codes: E21B 21/065 : Separating solids from drilling fluids

Abstract

Methods for making screen assemblies and screens for a vibratory separator or shale shaker, such methods including applying glue in a glue pattern to at least one layer of screening material, said applying done by powered moving mechanical glue application apparatus; in one aspect moving with powered mechanical screen movement apparatus the at least one layer of screening material beneath the powered moving mechanical glue application apparatus; in one aspect, using hot melt moisture-curing glue, and in one aspect facilitating the cure of moisture-curing glue by applying moisture to it.

Claims

1. A method for making a screen assembly for a vibratory separator, the vibratory separator including vibration apparatus for vibrating the screen assembly to impart vibratory forces to the screen assembly for vibrating the screen assembly during use of the screen assembly on the vibratory separator, the method comprising

applying glue in a glue pattern to at least one layer of screening material useful for screening fluid introduced to a vibratory separator, said applying done by powered moving mechanical glue application means, and

applying the glue in an amount sufficient so that said screen assembly while in use on the vibratory separator is able to withstand vibratory forces imparted thereto by the vibration apparatus of the vibratory separator,

wherein the glue is moisture-curing hot melt glue, the method further comprising heating the glue, and

moving with powered mechanical screen movement apparatus the at least one layer of screening material beneath the powered moving mechanical glue application means.

2. The method of claim 1 further comprising

applying moisture to glue in the glue pattern following application of the moisture-curing hot melt glue to the at least one layer of screening material.

3. The method of claim 1 wherein the at least one layer of screening material is three layers of screening material.

4. The method of claim 1 wherein the glue is applied in a bead with a width between {fraction (3/64)}ths and {fraction (3/32)}nds of an inch.

5. The method of claim 1 further comprising

moving at least one glue dispensing manifold with a plurality of spaced-apart glue dispensing nozzles above the at least one layer of screening material to apply the glue pattern.

6. The method of claim 1 further comprising

moving two spaced-apart glue dispensing manifolds each with a plurality of spaced-apart glue dispensing nozzles above the at least one layer of screening material to apply the glue pattern.

7. The method of claim 1 including mounting the screen assembly on screen assembly support means.

8. The method of claim 7 wherein the screen assembly support means is from the group consisting of frame, strip support, perforated sheet metal, and perforated plate.

9. The method of claim 1 further comprising

attaching hookstrip apparatus on each of two spaced-apart sides of the screen assembly.

10. The method of claim 1 wherein the glue pattern comprises a plurality of intersecting lines of glue extending across the at least one layer of screening material.

11. The method of claim 1 wherein the at least one layer of screening material is suitable for screening drilling fluid with drilling solids entrained therein.

12. A method for making a screen for a vibratory separator, the vibratory separator apparatus including vibration apparatus for vibrating the screen assembly to impart vibratory forces to the screen assembly for vibrating the screen assembly during use of the screen assembly on the vibratory separator, the method comprising

moving with screen movement apparatus at least one layer of screening material below a glue application apparatus, the glue application apparatus including a main body and a plurality of movable glue nozzles movably connected to the main body,

continuously moving the at least one layer of screening material beneath the glue application apparatus,

moving the movable glue nozzles with nozzle movement apparatus above the at least one layer of screening material,

applying with the movable glue nozzles an amount of glue flowing from the glue nozzles in a pattern to at least a portion of the at feast one layer of screening material, the glue comprising heated moisture-curing hot melt glue,

applying the glue in an amount sufficient so that said screen assembly is able to withstand vibratory forces imparted thereto by the vibration apparatus of the vibratory separator, and

allowing the glue to cure.

13. The method of claim 12 wherein a rate of movement of the at least one layer of screening material beneath the glue application apparatus is between 5 feet per minute to 30 feet per minute.

14. The method of claim 12 wherein the glue is heated moisture-curing hot melt glue.

15. The method of claim 12 further comprising

applying moisture to the heated moisture-curing hot melt glue to facilitate curing of it.

16. The method of claim 12 further comprising

tensioning the at least one layer of screening material below the glue application apparatus.

17. The method of claim 12 further comprising

rolling the at least one layer of screening material in a roll following application of glue thereto.

18. The method of claim 17 further comprising

positioning separator material with respect to the at least one layer of screening material to prevent undesired gluing together of screening material within the roll.

19. The method of claim 12 further comprising

combining at least one additional layer of screening material with the at least one layer of screening material.

20. The method of claim 19 wherein the at least one additional layer of screening material is combined with the at least one layer of screening material following application of glue to the at least one layer of screening material.

21. The method of claim 12 wherein the at least one layer of screening material is a layer of coarse mesh.

22. The method of claim 12 wherein the pattern includes a plurality of intersections of lines of glue.

23. The method of claim 12 further comprising

corrugating the at least one layer of screening material.

24. The method of claim 12 wherein the at least one layer of screening material is suitable for screening drilling fluid with drilling solids entrained therein.