Patent US5375780A successfully refreshed from Google Patents.
US5375780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comminuting wood pulp sheeting
Assignee: Courtaulds Fibres Holdings Ltd
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Filing: 1993-05-24
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Granted: 1994-12-27
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Expires: 2013-05-24
Abstract
Abstract A method of creating a comminuted feedstock of wood pulp for use in a processing plant which includes the steps of mounting a plurality of rolls of wood pulp sheet material of a first range of properties in a first roll stand, drawing sheet material off each roll in the first roll stand and laying the sheet materials one on the other to create a first pluri-layer web, withdrawing the first pluri-layer web from the first roll stand and leading it to a cutting area of a shredding mill, acting on the first pluri-layer web in the cutting area with rotating hooked disc cutters to tear platelets from the first pluri-layer web and to pass the torn platelets to an outlet of the shredding mill, pneumatically conveying the torn platelets away from the outlet using a fan with a bladed member rotating in a fan casing, and beating the torn platelets with the bladed member as they are conveyed through the fan casing to separate the torn platelets into pieces torn from the individual layers making up the first pluri-layer web.
Inventors
- 👤 Gary E. G. Gray
- 👤 Iain R. Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:50
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/06; D21B1/066; D21B1/068; D01; D01F; D01F2/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
187 words
A method of creating a comminuted feedstock of wood pulp for use in a processing plant which includes the steps of: a) mounting a plurality of rolls of wood pulp sheet material of a first range of properties in a first roll stand, b) drawing sheet material off each roll in the first roll stand and laying the sheet materials one on the other to create a first pluri-layer web, c) withdrawing the first pluri-layer web from the first roll stand and leading it to a cutting area of a shredding mill, d) acting on the first pluri-layer web in the cutting area with rotating hooked disc cutters to tear platelets from the first pluri-layer web and to pass said torn platelets to an outlet of the shredding mill, e) pneumatically conveying the torn platelets away from the outlet using a fan with a bladed member rotating in a fan casing, and f) beating the torn platelets with the bladed member as they are conveyed through the fan casing to separate the torn platelets into pieces torn from the individual layers making up the first pluri-layer web.
Claim 2
Independent Claim
187 words
A method of creating a comminuted feedstock of wood pulp for use in a processing plant which includes the steps of: a) mounting a plurality of rolls of wood pulp sheet material of a first range of properties in a first roll stand, b) drawing sheet material off each roll in the first roll stand and laying the sheet materials one on the other to create a first pluri-layer web, c) withdrawing the first pluri-layer web from the first roll stand and leading it to a cutting area of a shredding mill, d) acting on the first pluri-layer web in the cutting area with rotating hooked disc cutters to tear platelets from the first pluri-layer web and to pass said torn platelets to an outlet of the shredding mill, e) pneumatically conveying the torn platelets away from the outlet using a fan with a bladed member rotating in a fan casing, and f) beating the torn platelets with the bladed member as they are conveyed through the fan casing to separate the torn platelets into pieces torn from the individual layers making up the first pluri-layer web.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein a second roll stand is provided to create a second pluri-layer web and said first and second webs are fed together into the cutting area of the shredding mill.
Claim 4
Dependent Claim
53 words
A method according to claim 2, wherein the first pluri-layer web is made up of sheet materials having viscosity ratings in a first band of viscosities and the second pluri-layer web is made up of sheet materials having viscosity ratings in a second band of viscosities which is higher than said first band.
Claim 5
Dependent Claim
34 words
A method according to claim 3, wherein the rate of advance of the second web to the cutting area is lower than the rate of advance of the first web to the cutting area.
Claim 6
Dependent Claim
22 words
A method according to claim 1, wherein there are between four and twelve layers of sheet material in the first pluri-layer web.
Claim 7
Dependent Claim
48 words
A method according to claim 2, wherein there are 2p /3 layers of sheet material in the first web and p /3 layers of sheet material in the second web, p being an integer number which is a multiple of 3 and which is not less than 6.
Claim 8
Dependent Claim
12 words
A method according to claim 6, wherein p is equal to 12.
Claim 9
Independent Claim
116 words
A method of creating a comminuted feedstock of wood pulp for use in a processing plant which includes the steps of: a) feeding wood pulp in sheet form to a cutting area created by a nip formed between contra-rotating interdigitating hooked disc cutters, tearing pieces from the sheet-formed pulp with the hooks and passing the torn pieces through the nip, b) receiving the torn pieces downstream of the nip in the casing of a fan having a bladed rotor turnably mounted in the casing, c) drawing the torn pieces through the casing by pneumatic flows created by the bladed rotor, and d) breaking up the torn pieces in the casing by engagement with the bladed rotor.
Claim 10
Independent Claim
116 words
A method of creating a comminuted feedstock of wood pulp for use in a processing plant which includes the steps of: a) feeding wood pulp in sheet form to a cutting area created by a nip formed between contra-rotating interdigitating hooked disc cutters, tearing pieces from the sheet-formed pulp with the hooks and passing the torn pieces through the nip, b) receiving the torn pieces downstream of the nip in the casing of a fan having a bladed rotor turnably mounted in the casing, c) drawing the torn pieces through the casing by pneumatic flows created by the bladed rotor, and d) breaking up the torn pieces in the casing by engagement with the bladed rotor.
Claim 11
Dependent Claim
23 words
A method according to claim 8, wherein the pieces of wood pulp have an area of between 2 and 20 cm 2 .
Claim 12
Dependent Claim
47 words
In the production of cellulosic fiber from wood pulp sheeting the improvement which comprises forming a pluri-layer web from the sheeting, tearing laminated platelets from the web and separating the platelets into sheeting pieces in a cutter fan used to convey the sheeting pieces in the process.
Claim 13
Dependent Claim
47 words
In the production of cellulosic fiber from wood pulp sheeting the improvement which comprises forming a pluri-layer web from the sheeting, tearing laminated platelets from the web and separating the platelets into sheeting pieces in a cutter fan used to convey the sheeting pieces in the process.
Claim 14
Dependent Claim
15 words
The process claimed in claim 10 wherein tearing is effected between contra-rotating toothed disk cutters.
References Cited (Backward Citations)
US3061206A
Cited
US3824652A
Cited
US4252279A
Cited
US4241881A
Cited
US4717085A
Cited
US5005770A
Cited
US5141168A
Cited
US5110060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |