Production of shaped articles from paper sludge
阅读：850发布：2021-11-27
专利汇可以提供Production of shaped articles from paper sludge专利检索，专利查询，专利分析的服务。并且A process for the production of a shaped article from paper sludge which comprises depositing a layer of an aqueous slurry of the sludge and controlling the water content of the slurry by applied pressure so as to produce a coherent agglomerated layer having a degree of wet strength, and a water content of from 40 to 85% by weight based on the total weight of the layer and forming the layer under pressure with drying to produce a shaped article.，下面是Production of shaped articles from paper sludge专利的具体信息内容。
1. A PROCESS FOR THE PRODUCTION OF A SHAPED ARTICLE FROM PAPER SLUDGE WHICH COMPRISES DEPOSITING A LAYER OF AN AQUEOUS SLURRY OF SAID SLUDGE, CONTROLLING THE WATER CONTENT OF THE SLURRY BY APPLYING PRESSURE SO AS TO PRODUCE A COHERENT AGGLOMERATED LAYER HAVING A DEGREE OF WET STRENGTH AND A WATER CONTENT OF FROM 40 TO 85% BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE LAYER AND THEN FORMING THE LAYER UNDER PRESSURE WITH DRYING TO PRODUCE A SHAPED ARTICLE.
2. The process according to claim 1 in which the aqueous slurry is deposited on to a liquid permeable support.
3. The process according to claim 1 in which extra fibrous material is added to the aqueous slurry before deposition to assist in agglomeration of the sludge.
4. The process according to claim 1, in which the aqueous slurry before deposition has a solids content of from 5 to 30% by weight.
5. The process according to claim 4, in which the solids content comprises 20 to 80% by weight of a fibrous component and 80 to 20% by weight of a mineral component.
6. The process according to claim 2, in which the aqueous slurry is deposited from the discharge orifice of an extruder at a predetermined rate on to the liquid permeable support which is movable relative to the discharge orifice.
7. The process according to claim 6, in which the liquid permeable support comprises an endless moving belt of metal or plastic mesh or gauze.
8. The process according to claim 2, in which the slurry is passed through an extruder equipped with means for removing part of its water content prior to deposition of the layer.
9. The process according to claim 2, in which the support carrying the deposited slurry is passed through a series of pressure rolls which progressively squeeze out water from the deposited slurry to produce the coherent agglomerated layer.
10. The process according to claim 1, in which a cylindrical vacuum filter is partly immersed in the slurry and rotated so as to deposit a layer of slurry on its circumference and the layer of agglomerated slurry is removed from the filter in a continuous operation.
11. The process according to claim 1, in which the water content of the layer is controlled so as to produce an agglomerated layer having a wet strength sufficient to withstand bending to an angle of 90* without cracking.
12. The process according to claim 1, in which the water content of the layer is controlled so as to produce an agglomerated layer having a wet strength such that an 8 feet X 4 feet section will maintain its integrity with minimal support over each 2 feet of its running length and such that an area of at least 4 square feet will maintain its integrity when supported only at its edges.
13. The process according to claim 1, in which the water content of the layer is controlled so as to produce an agglomerated layer having a thickness of from one-eighth to one-half inch.
14. The process according to claim 1, in which the water content of the layer is controlled so as to produce an agglomerated layer having a density of from 0.8 to 2.0 grams per cc.
15. The process according to claim 1, in which the agglomerated layer is molded under heat and pressure to form the shaped article.
16. The process according to claim 15, in which the shaped article is a board and the moulding pressure is up to 2,400 pounds per square inch.
17. The process according to claim 15, in which the shaped article is a moulded article and the moulding pressure is from 50 pounds per square inch to 2 tons per square inch.
18. The process according to claim 1, in which the forming with drying operation is carried out at a temperature of from 100* to 190*C.
19. The process according to claim 1, in which a plurality of agglomerated layers are formed, superimposed one on the other, and then laminated beTween pressure rollers.
20. The process according to claim 1, in which an agglomerated layer is first formed and then a further layer of aqueous slurry of paper sludge is deposited thereon, the water content of the composite layer being controlled by passing it through pressure rolls to obtain a laminated coherent agglomerated layer.
21. The process according to claim 1, in which there is added to the slurry before deposition from 5 to 40% by weight of a synthetic resin.
22. The process according to claim 21, in which the synthetic resin is a styrene/butadiene resin, an acrylic resin, a vinyl acetate resin, a vinyl chloride resin, a phenol formaldehyde resin, a melamine formaldehyde resin, or a urea formaldehyde resin.
23. The process according to claim 1, in which there is added to the slurry before deposition a flame retardant.
24. The process according to claim 23, in which the flame retardant is a borate, boric acid, mono-ammonium phosphate, or aluminium hydroxide.
25. The process according to claim 1, in which the slurry is deposited over a reinforcing medium to form a reinforced agglomerated layer.
26. The process according to claim 25, in which the medium is a layer of fibres.
27. The process according to claim 25, in which the medium is a fibrous mat.
28. The process according to claim 1, in which a mineral filler is added to the slurry before deposition.
29. The process according to claim 1, wherein the coherent agglomerated layer is dried to a water content of between 30 and 40% before the layer is formed into a shaped article.
30. A PRESSURE-FORMABLE COHERENT AGGLOMERATED LAYER OF PAPER SLUDGE HAVING A THICKNESS GREATER ONE-SIXTEENTH OF AN INCH, A DENSITY OF FROM 0.8 TO 2.0 GRAMS PER CUBIC CENTIMETER, AND A WATER CONTENT OF FROM 40 TO 85% BY WEIGHT BASED ON A TOTAL WEIGHT OF THE LAYER, THE LAYER BEING SUFFICIENTLY SELF-SUPPORTING TO ENABLE IT TO BE HANDLED WITHOUT DISINTEGRATION.
31. The layer according to claim 30, having a wet strength sufficient to withstand bending to an angle of 90* without cracking.
32. The layer according to claim 30, having a wet strength such that an 8 foot by 4 foot section will maintain its integrity with minimal support over each 2 feet of its running length and such that an area of at last 4 square feet will maintain its integrity when supported only at its edges.
33. The layer according to claim 30, having a thickness of from one-eighth to one-half inch.
34. A laminate comprising a plurality of layers according to claim 30.
35. A process for the production of a pressure-formable coherent agglomerated layer, which comprises depositing a layer of an aqueous slurry of paper sludge and controlling the water content of the slurry with applied pressure and drying so as to produce a coherent agglomerated layer having a thickness greater than one-sixteenth of an inch, a density of from 0.8 to 2.0 grams per cubic centimeter, and a water content of from 40 to 85% by weight based on the total weight of the layer, the layer being sufficiently self-supporting to enable it to be handled without disintegration.
36. The process according to claim 35, in which the aqueous slurry is deposited onto a liquid permeable support to form the layer.
37. The process according to claim 35, in which the aqueous slurry is deposited from an extruder at a predetermined rate onto a liquid permeable support which is movable relative to the discharge orifice of the extruder.
38. The process according to claim 35, in which the aqueous slurry is deposited upon a liquid permeable support and the support carrying the deposited slurry is passed through a series of pressure rolls which progressively squeeze out water from the deposited slurry.
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