Patent EP0546585A2 successfully refreshed from Google Patents.
EP0546585A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for screening peat moss material
Assignee: Johnson and Johnson Inc
•
Filing: 1992-12-14
•
Granted: —
•
Expires: 2012-12-14
Abstract
Abstract Method and apparatus for screening peat moss material. The method comprises the steps of forming an aqueous slurry of peat moss material and flowing the slurry on a screen (20) to separate fines from coarser particles in the slurry. A spray of relatively large water drops is directed at the slurry to agitate the coarser particles blocked by the screen (20) in order to dislodge fines adhering thereto, whereby the fines freed from the coarser particles are allowed to egress the slurry through the screen (20). The water spray also has the effect of clearing the screen of fines which clog the screen openings. The invention also comprehends a method and apparatus for screening peat moss material, comprising the steps of flowing an aqueous slurry of peat moss material on a sieve (42) to extract from the slurry excessively large particles, and washing the rejects remaining on the sieve (42) to dislodge therefrom smaller particles of acceptable size which are returned to the slurry.
Inventors
- 👤 Martin Lemay
- 👤 Serge Cadieux
- 👤 Jacques Audet
- 👤 Martin Roy
- 👤 John Dery
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 06:25
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/50; B07B1/55
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A method for screening peat moss material in particulate form, comprising the steps of: - forming a slurry of peat moss material having a pumpable consistency; - depositing said slurry on a screen to separate fines from coarser particles in said slurry by straining action; - directing a spray of fluid at said slurry while said slurry is on said screen to agitate said coarser particles in order to: i) agitate said coarser particles to dislodge fines adhered thereto, whereby fines freed from said coarser particles are allowed to egress said slurry through said screen; and ii) clear openings of said screen clogged by fines.
Claim 2
Independent Claim
105 words
A method for screening peat moss material in particulate form, comprising the steps of: - forming a slurry of peat moss material having a pumpable consistency; - depositing said slurry on a screen to separate fines from coarser particles in said slurry by straining action; - directing a spray of fluid at said slurry while said slurry is on said screen to agitate said coarser particles in order to: i) agitate said coarser particles to dislodge fines adhered thereto, whereby fines freed from said coarser particles are allowed to egress said slurry through said screen; and ii) clear openings of said screen clogged by fines.
Claim 3
Dependent Claim
22 words
A method as defined in claim 1, comprising the step of displacing said spray of relatively large water drops over said screen.
Claim 4
Dependent Claim
34 words
A method as defined in claim 2, comprising the step of varying a velocity of said water drops when impinging on said screen with a position of said spray with relation to said screen.
Claim 5
Dependent Claim
45 words
A method as defined in claim 1, further comprising the steps of: - collecting said slurry from an outlet of said screen; and - transferring said slurry to a sieve to remove from said slurry excessively large particles having a size exceeding a predetermined value.
Claim 6
Dependent Claim
66 words
A method as defined in claim 4, further comprising the step of directing a spray of relatively large water drops at rejects retained by said sieve in order to dislodge from said rejects smaller particles adhering thereto and having a size below said predetermined value, whereby smaller particles freed from said rejects are returned in suspension in said slurry and allowed to pass through said sieve.
Claim 7
Dependent Claim
23 words
A method as defined in claim 5, further comprising the step of displacing said spray of relatively large water drops over said sieve.
Claim 8
Independent Claim
245 words
A method for classifying peat moss material in particulate form, said method comprising the steps of: - forming an aqueous slurry of peat moss material having a consistency in the range from about 0.40 to about 1.20 % solids; - flowing said slurry over a screen (20) having a mesh size in the range from about 40 to about 100 in order to separate fines from coarser particles in said slurry by straining action; - directing at said slurry a spray of relatively large water drops while said slurry is on said screen (20) to: i) agitate said coarser particles to dislodge fines adhered thereto, whereby fines freed from said coarser particles are allowed to egress said slurry through said screen (20); and ii) clear openings of said screen (20) clogged by fines, - collecting said slurry from an outlet of said screen (20; - flowing said slurry over a sieve (42) having a mesh size from about 8 to about 14 to eliminate from said slurry oversize particles having a dimension in excess of a predetermined value; - washing rejects blocked by said sieve (42) with a spray of relatively large water drops to dislodge from said rejects acceptable particles adhering to said rejects and having a size such that said acceptable particles are capable of passing through said sieve (42), whereby acceptable particles freed from said rejects are returned in suspension in said slurry and are allowed to pass through said sieve (42).
Claim 9
Independent Claim
245 words
A method for classifying peat moss material in particulate form, said method comprising the steps of: - forming an aqueous slurry of peat moss material having a consistency in the range from about 0.40 to about 1.20 % solids; - flowing said slurry over a screen (20) having a mesh size in the range from about 40 to about 100 in order to separate fines from coarser particles in said slurry by straining action; - directing at said slurry a spray of relatively large water drops while said slurry is on said screen (20) to: i) agitate said coarser particles to dislodge fines adhered thereto, whereby fines freed from said coarser particles are allowed to egress said slurry through said screen (20); and ii) clear openings of said screen (20) clogged by fines, - collecting said slurry from an outlet of said screen (20; - flowing said slurry over a sieve (42) having a mesh size from about 8 to about 14 to eliminate from said slurry oversize particles having a dimension in excess of a predetermined value; - washing rejects blocked by said sieve (42) with a spray of relatively large water drops to dislodge from said rejects acceptable particles adhering to said rejects and having a size such that said acceptable particles are capable of passing through said sieve (42), whereby acceptable particles freed from said rejects are returned in suspension in said slurry and are allowed to pass through said sieve (42).
Claim 10
Independent Claim
107 words
A method for screening peat moss material, comprising the steps of: - forming a slurry of peat moss material having a pumpable consistency; - depositing said slurry on a sieve to eliminate from said slurry particles larger than a predetermined acceptable dimension; - directing a fluid spray at said slurry while said slurry is on said sieve (42) in order to dislodge from rejects blocked by said sieve (42) acceptable particles adhering to said rejects and having a size less than said predetermined acceptable dimension, whereby acceptable particles freed from said rejects are returned in suspension in said slurry and are allowed to pass through said sieve.
Claim 11
Independent Claim
107 words
A method for screening peat moss material, comprising the steps of: - forming a slurry of peat moss material having a pumpable consistency; - depositing said slurry on a sieve to eliminate from said slurry particles larger than a predetermined acceptable dimension; - directing a fluid spray at said slurry while said slurry is on said sieve (42) in order to dislodge from rejects blocked by said sieve (42) acceptable particles adhering to said rejects and having a size less than said predetermined acceptable dimension, whereby acceptable particles freed from said rejects are returned in suspension in said slurry and are allowed to pass through said sieve.
Claim 12
Independent Claim
123 words
An apparatus for screening peat moss material, comprising: - a screen (20) having a predetermined mesh size; - a supply conduit (18) for delivering to said screen (20) a slurry of peat moss material having a pumpable consistency, wherein said screen allows to separate fines from coarser particles in said slurry by straining action; - a spray head (22) in fluid communication with a pressurized supply of fluid for generating a fluid spray directed at said slurry while said slurry is on said screen to: i) agitate said coarser particles to dislodge fines adhered thereto, whereby fines freed from said coarser particles are allowed to egress said slurry through said screen (20); and ii) clear openings of said screen (20) clogged by fines.
Claim 13
Independent Claim
123 words
An apparatus for screening peat moss material, comprising: - a screen (20) having a predetermined mesh size; - a supply conduit (18) for delivering to said screen (20) a slurry of peat moss material having a pumpable consistency, wherein said screen allows to separate fines from coarser particles in said slurry by straining action; - a spray head (22) in fluid communication with a pressurized supply of fluid for generating a fluid spray directed at said slurry while said slurry is on said screen to: i) agitate said coarser particles to dislodge fines adhered thereto, whereby fines freed from said coarser particles are allowed to egress said slurry through said screen (20); and ii) clear openings of said screen (20) clogged by fines.
Claim 14
Dependent Claim
30 words
An apparatus as defined in claim 9, wherein said spray head (22) is movable in order to displace said fluid spray over said screen (20) to reach different sections thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.