CA1126466A - Method and apparatus for the production of cellulosic insulation from virgin ground wood flash-dried pulp - Google Patents
Method and apparatus for the production of cellulosic insulation from virgin ground wood flash-dried pulpInfo
- Publication number
- CA1126466A CA1126466A CA314,454A CA314454A CA1126466A CA 1126466 A CA1126466 A CA 1126466A CA 314454 A CA314454 A CA 314454A CA 1126466 A CA1126466 A CA 1126466A
- Authority
- CA
- Canada
- Prior art keywords
- fibres
- intermingled
- collection
- compacted
- partially separated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009413 insulation Methods 0.000 title claims abstract description 13
- 239000002023 wood Substances 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims 5
- 239000007787 solid Substances 0.000 claims 2
- 239000000126 substance Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/26—Special paper or cardboard manufactured by dry method; Apparatus or processes for forming webs by dry method from mainly short-fibre or particle material, e.g. paper pulp
- D21H5/2607—Pretreatment and individualisation of the fibres, formation of the mixture fibres-gas and laying the fibres on a forming surface
- D21H5/2614—Detachment of the fibres from their compressed state, e.g. by disintegration of a pulpboard
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J1/00—Fibreboard
- D21J1/16—Special fibreboard
- D21J1/20—Insulating board
Landscapes
- Paper (AREA)
Abstract
Method and Apparatus for the Production of Cellulosic Insulation from Virgin Ground Wood Flash-Dried Pulp A B S T R A C T
-A method and apparatus for the pro-duction of cellulosic fibre insulation involving the grinding up of ground wood flash-dried pulp by an abrasive belt into a partially separated and intermingled collection of fibres and further separating and intermingling the partially separ-ated and intermingled collection of fibres by passing the latter through a restricted zone formed by a pair of vertically spaced, axially aligned disks, opposed faces of which have affixed teeth which mesh with each other when one disk is rotated relative to the other.
-A method and apparatus for the pro-duction of cellulosic fibre insulation involving the grinding up of ground wood flash-dried pulp by an abrasive belt into a partially separated and intermingled collection of fibres and further separating and intermingling the partially separ-ated and intermingled collection of fibres by passing the latter through a restricted zone formed by a pair of vertically spaced, axially aligned disks, opposed faces of which have affixed teeth which mesh with each other when one disk is rotated relative to the other.
Description
~Z~ i6 The present invention relates to a method and apparatus for production of cellulosic fibre insulation, utilizing ground wood Elash-dried pulp.
Present day cellulosic fibre insulation of the loose fill type is typically produced by grinding up and treating used newsprint. The news-print is ground up in at least two separate stages and chemically treated by pounding into the ground material, powdered chemicals for fire and vermin proofing. Because the raw material generally includes paper of ~arying characteristics, viz. magazines, newspapers, advertising circulars, etc., resultant ground treated material which has an average density of 2.0 pounds per cubic foot, settling eventually to 2.7 pounds per cubic foot, exhibits a density which can vary by up to 20% from this average. The large uncertainty in the density requires a greater amount of insulation to be used in an application which specifies a given heat resistance requirement.
For a similar reason, the water content of the finished insulation obtained from ground used news-print is highly variable, lying in the range of 5%
to 20%. This variation in water content is a large contributing factor to the variability in density of the finished product and its insulating properties.
Additionally, there are commonly encountered problems with foreign matters such as stones, paper clips, etc.
~L~26~6~
which enter the grinding apparatus and cause rapid ware or breaka~e of the production equipment.
Because the chemicals used to treat the ground material for fire and vermin proofing ~re applied to the cJround used newsprint insulation material in powder form, they exhibit a marked tendency to separate from the insulation material when subjected to movement of any sort. Unfortunately, application of liquid treating chemicals which bond more strongly to the cellulose fibres are impractical given the expense of installing a suitable flash-dryer.
According -to -the invention, there is provided a method of producing cellulosic fibre insulation from compacted ground wood flash dried pulp comprising separating and intermingling the individual fibres of the compacted ground wood flash~
dried pulp into a loosely intermingled collection of such fibres.
By using compacted ground ~ood flash-dried pulp as produced in a pulp mill, it is possible to have the physical properties of the raw material more closely controlled than by using used newsprint to ensure uniform characterist~cs of the final insulation product. Moreover, by utilizing a raw material which has been chemically treated at its point of manufacture, viz. a pulp mill or the like, by means of a wet application of chemicals, the previous problem of separation of those chemicals from the insulation is overcome as chemicals thus applied become molecularly bonded to the fibres.
However, it is contemplated within the scope of the present invention to utilize previously untreated compacted ground wood flash-dried pulp and apply the treating chemicals in powder form during the fibre separating and intermingling process as is done in conventional processes which utilize used newsprint as the raw material.
The Figure is a schematic illustration of the apparatus used to grind and further separate and intermingle the fibres of the compacted pulp.
Referring to the Figure, a bale of compacted, treated ground wood 1ash-dried pulp 10 is loaded onto a ti]t-frame assembly 12, which tilts the bale 10 onto a generally horizontal orientated conveyor belt 14 in response to a signal triggered by the movement of a previously loaded bale past a preselected location on the conveyor belt 14. The conveyor belt 14 feeds bales of the compacted pulp 10 between a vertically spaced, generally horizontal upper and lower short conveyor belts 20 and 18, respectively. The upper ~Z~6~
conveyor belt 20, is upwardly movable against a means for applying a downward restoring force to the belt 20 and is -Eorced slightly upwards by entry oE the bale 10 between the upper and lower belts 20 and 18, respectively. The resultant downward force exerted by the upper belt 20 on the inserted bale 10, allows the bale 10 to be firmly gripped by both the upper and lower belts 20 and 18, respectively, allowing the inserted bale 10 to be pressed against the abrasive surface of a vertically orientated grinder belt 24 with a continuous preselected force. The latter Eorce is generated by a D.C. motor suitably coupled by chains (not shown) to both upper and lower conveyor belts 25 and 31 which adjust the rotational speed of the pulleys 25 and 31 to produce a constant torque thereon. The surface of the grinder belt 24 is roughened and abrasively acts to grind bales 10 into a partially separated and intermingled collection of fibres as the bales lO are pressed against the abrasive surface of the grinder belt 24. Typically, for compacted pulp having a density of 50 pounds per cubic foot, the optimum preselected force corresponds to a pressure on the bale 10 in the range of 2 to 4 pounds per square inch for optimum grinding effect. Applied pressures of less than 2 pounds per square inch would result in the production of powdered material and applied pressures greater than 4 pounds per square inch l~Z~41~6 would cause excessively large chunks of pulp to break off and place prohibitive power demands on the D.C. motor.
The partially separated and intermingled collection oE fibres produced by the abrasive action of the grinding belt 24 fall by gravity to a vertically disposed feed hopper 26 located generally below the grinder belt 24 and communi-cating with a central annulus 27 of an upper disk 28, the latter disk being mounted in a fixedposition with respect to a disk housing 29. The foregoing collection of fibres are then moved by an air stream into a restricted zone formed by the space between downward projecting teeth affixed to the lower face of the upper disk 28, meshing with upwardl.y projecting teeth affixed to the opposed face of the lower disk 30. Rotation of the lower disk 30 relative to the upper fixed disk 28, causes th~ partially separated and intermi.ngled collection of fibres to be further separated and intermingled into a collection of loosely intermingled fibres.
The foregoing air stream is generated by the rotation of a plurality of circumferentially spaced radially outward projecting paddles 36 affixed to the periphery of said lower rotational disk 30 which draws air downwardly through the feed hopper 26 and central annulus 27 through the restricted zone out into a cavity 38 of the disk housing 29.
Air in the cavity 38 is then forced outwardly ~2~9~6~;
through a chute 40 communicating with the cavity 38 to a receiving container (not shown). The air stream so generated draws partially separated and intermingled Eibres into the restric-ted zone and forces the resulting loosely intermingled fibres out into the cavity 38, through chute 40 to a receiving container.
~lthough the apparatus shown in the Figure employs upper and lower horiæontal conveyor belts 20 and 18, respectively, to feed the bales 10 against the grinding belt 24 with a constant pressure, alter-native methods of feeding the grinder belt may easily be envisa~ed such as feeding the bales 10 into the grinding belt area 24 with a conveyor belt 14 positloned in a direction transverse to the direction of move-ment of the bales lO during grinding and employing a hydraulic ram (not shown) against bales positioned against the grinder belt 24 to apply the constant force directly to the back of the bales lO.
Different methods of applying the air stream might also be envisaged such as directing a separate air stream into the top of feed hopper 26 rather than employing paddles 36 affixed to the periphery of the lower rotational disk 30. The method also cont~mplates alternative methods of further separating and intermingling the partially separated and intermingled fibres such as flaying assemblies, rotating brushes and the like.
Typically, the density of the compacted bales is approximately 50 pounds per cubic foot and the finished insulation in the orm of loosely intermingled fibres has a density o 1.5 pounds per cubic foot. Moreover, the water content of the finished insulation material lies in the range of 9~ to 11% and exhibits no separation of the ire retardant and vermin proofing chemicals.
Other obvious variations, modifications and departures from the specific process and apparatus described above, will readily occur to those skilled in the art without departing from the spirit of the invention. The scope of the invention is set forth in the accompanying claims.
Present day cellulosic fibre insulation of the loose fill type is typically produced by grinding up and treating used newsprint. The news-print is ground up in at least two separate stages and chemically treated by pounding into the ground material, powdered chemicals for fire and vermin proofing. Because the raw material generally includes paper of ~arying characteristics, viz. magazines, newspapers, advertising circulars, etc., resultant ground treated material which has an average density of 2.0 pounds per cubic foot, settling eventually to 2.7 pounds per cubic foot, exhibits a density which can vary by up to 20% from this average. The large uncertainty in the density requires a greater amount of insulation to be used in an application which specifies a given heat resistance requirement.
For a similar reason, the water content of the finished insulation obtained from ground used news-print is highly variable, lying in the range of 5%
to 20%. This variation in water content is a large contributing factor to the variability in density of the finished product and its insulating properties.
Additionally, there are commonly encountered problems with foreign matters such as stones, paper clips, etc.
~L~26~6~
which enter the grinding apparatus and cause rapid ware or breaka~e of the production equipment.
Because the chemicals used to treat the ground material for fire and vermin proofing ~re applied to the cJround used newsprint insulation material in powder form, they exhibit a marked tendency to separate from the insulation material when subjected to movement of any sort. Unfortunately, application of liquid treating chemicals which bond more strongly to the cellulose fibres are impractical given the expense of installing a suitable flash-dryer.
According -to -the invention, there is provided a method of producing cellulosic fibre insulation from compacted ground wood flash dried pulp comprising separating and intermingling the individual fibres of the compacted ground wood flash~
dried pulp into a loosely intermingled collection of such fibres.
By using compacted ground ~ood flash-dried pulp as produced in a pulp mill, it is possible to have the physical properties of the raw material more closely controlled than by using used newsprint to ensure uniform characterist~cs of the final insulation product. Moreover, by utilizing a raw material which has been chemically treated at its point of manufacture, viz. a pulp mill or the like, by means of a wet application of chemicals, the previous problem of separation of those chemicals from the insulation is overcome as chemicals thus applied become molecularly bonded to the fibres.
However, it is contemplated within the scope of the present invention to utilize previously untreated compacted ground wood flash-dried pulp and apply the treating chemicals in powder form during the fibre separating and intermingling process as is done in conventional processes which utilize used newsprint as the raw material.
The Figure is a schematic illustration of the apparatus used to grind and further separate and intermingle the fibres of the compacted pulp.
Referring to the Figure, a bale of compacted, treated ground wood 1ash-dried pulp 10 is loaded onto a ti]t-frame assembly 12, which tilts the bale 10 onto a generally horizontal orientated conveyor belt 14 in response to a signal triggered by the movement of a previously loaded bale past a preselected location on the conveyor belt 14. The conveyor belt 14 feeds bales of the compacted pulp 10 between a vertically spaced, generally horizontal upper and lower short conveyor belts 20 and 18, respectively. The upper ~Z~6~
conveyor belt 20, is upwardly movable against a means for applying a downward restoring force to the belt 20 and is -Eorced slightly upwards by entry oE the bale 10 between the upper and lower belts 20 and 18, respectively. The resultant downward force exerted by the upper belt 20 on the inserted bale 10, allows the bale 10 to be firmly gripped by both the upper and lower belts 20 and 18, respectively, allowing the inserted bale 10 to be pressed against the abrasive surface of a vertically orientated grinder belt 24 with a continuous preselected force. The latter Eorce is generated by a D.C. motor suitably coupled by chains (not shown) to both upper and lower conveyor belts 25 and 31 which adjust the rotational speed of the pulleys 25 and 31 to produce a constant torque thereon. The surface of the grinder belt 24 is roughened and abrasively acts to grind bales 10 into a partially separated and intermingled collection of fibres as the bales lO are pressed against the abrasive surface of the grinder belt 24. Typically, for compacted pulp having a density of 50 pounds per cubic foot, the optimum preselected force corresponds to a pressure on the bale 10 in the range of 2 to 4 pounds per square inch for optimum grinding effect. Applied pressures of less than 2 pounds per square inch would result in the production of powdered material and applied pressures greater than 4 pounds per square inch l~Z~41~6 would cause excessively large chunks of pulp to break off and place prohibitive power demands on the D.C. motor.
The partially separated and intermingled collection oE fibres produced by the abrasive action of the grinding belt 24 fall by gravity to a vertically disposed feed hopper 26 located generally below the grinder belt 24 and communi-cating with a central annulus 27 of an upper disk 28, the latter disk being mounted in a fixedposition with respect to a disk housing 29. The foregoing collection of fibres are then moved by an air stream into a restricted zone formed by the space between downward projecting teeth affixed to the lower face of the upper disk 28, meshing with upwardl.y projecting teeth affixed to the opposed face of the lower disk 30. Rotation of the lower disk 30 relative to the upper fixed disk 28, causes th~ partially separated and intermi.ngled collection of fibres to be further separated and intermingled into a collection of loosely intermingled fibres.
The foregoing air stream is generated by the rotation of a plurality of circumferentially spaced radially outward projecting paddles 36 affixed to the periphery of said lower rotational disk 30 which draws air downwardly through the feed hopper 26 and central annulus 27 through the restricted zone out into a cavity 38 of the disk housing 29.
Air in the cavity 38 is then forced outwardly ~2~9~6~;
through a chute 40 communicating with the cavity 38 to a receiving container (not shown). The air stream so generated draws partially separated and intermingled Eibres into the restric-ted zone and forces the resulting loosely intermingled fibres out into the cavity 38, through chute 40 to a receiving container.
~lthough the apparatus shown in the Figure employs upper and lower horiæontal conveyor belts 20 and 18, respectively, to feed the bales 10 against the grinding belt 24 with a constant pressure, alter-native methods of feeding the grinder belt may easily be envisa~ed such as feeding the bales 10 into the grinding belt area 24 with a conveyor belt 14 positloned in a direction transverse to the direction of move-ment of the bales lO during grinding and employing a hydraulic ram (not shown) against bales positioned against the grinder belt 24 to apply the constant force directly to the back of the bales lO.
Different methods of applying the air stream might also be envisaged such as directing a separate air stream into the top of feed hopper 26 rather than employing paddles 36 affixed to the periphery of the lower rotational disk 30. The method also cont~mplates alternative methods of further separating and intermingling the partially separated and intermingled fibres such as flaying assemblies, rotating brushes and the like.
Typically, the density of the compacted bales is approximately 50 pounds per cubic foot and the finished insulation in the orm of loosely intermingled fibres has a density o 1.5 pounds per cubic foot. Moreover, the water content of the finished insulation material lies in the range of 9~ to 11% and exhibits no separation of the ire retardant and vermin proofing chemicals.
Other obvious variations, modifications and departures from the specific process and apparatus described above, will readily occur to those skilled in the art without departing from the spirit of the invention. The scope of the invention is set forth in the accompanying claims.
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for producing cellulosic fibre insulation from compacted ground wood flash-dried pulp, comprising separating and intermingling individual fibres of a compacted solid bale of the ground wood flash-dried pulp into a loosely intermingled collection of such fibres.
2. A method as defined in claim 1, comprising the steps of:
(a) grinding the compacted bale into a partially separated and intermingled collection of fibres;
(b) further separating and intermingling the partially separated and inter-mingled fibres into a loosely intermingled collection of such fibres.
(a) grinding the compacted bale into a partially separated and intermingled collection of fibres;
(b) further separating and intermingling the partially separated and inter-mingled fibres into a loosely intermingled collection of such fibres.
3. A method as defined in claim 2, wherein said further separating and intermingling of partially separated and intermingled fibres is accomplished by delivering the partially separated and intermingled collection of fibres to a restricted zone between a pair of vertically spaced, axially aligned disks, one disk rotating relative to the other, each of said disks having affixed to one face thereof, a set of teeth meshing in said restricted zone with a set of teeth affixed to an opposing face on the other of said disks.
4. A method as defined in claim 3, wherein - Page 1 of Claims -an air stream carries said partially separated and intermingled collection of fibres into said res-tricted zone and carries said loosely intermingled fibres away from said restricted zone.
5. A method as defined in claim 3, wherein said grinding is accomplished by pressing said compacted bale against a moving abrasive belt.
6. A method as defined in claim 4, wherein said grinding is accomplished by pressing said compacted bale against a moving abrasive belt.
7. Apparatus for preparing cellulosic fibre insulation from compacted ground wood flash-dried pulp, comprising:
(a) means for partially separating and intermingling the individual fibres of a compacted solid bale of the pulp;
and (b) means for further separating and intermingling the separated fibres into a loosely intermingles collection of such fibres.
(a) means for partially separating and intermingling the individual fibres of a compacted solid bale of the pulp;
and (b) means for further separating and intermingling the separated fibres into a loosely intermingles collection of such fibres.
8. Apparatus as defined in claim 7, comprising:
(a) means for grinding the compacted bale into a partially separated and intermingled collection of fibres;
and (b) a pair of vertically spaced, axially aligned, disks, each of said disks having affixed to one face thereof, a set of teeth meshing in a restricted zone between the disks with a set of teeth affixed to an opposed face - Page 2 of Claims -on the other of said disks, one of said disks being rotationally mounted for rotation in relation to the other of said disks, whereby the partially separated and inter-mingled fibres transported to said restricted zone are further separated and intermingled when said one disk is rotated relative to the other of said disks; and (c) first feed means for transporting said partially separated and inter-mingled collection of fibres from said grinding means to said restricted zone; and (d) second feed means for transporting the partially separated and inter-mingled collection of fibres through said restricted zone and for trans-porting resulting loosely inter-mingled fibres from said restricted zone to a receiving container.
(a) means for grinding the compacted bale into a partially separated and intermingled collection of fibres;
and (b) a pair of vertically spaced, axially aligned, disks, each of said disks having affixed to one face thereof, a set of teeth meshing in a restricted zone between the disks with a set of teeth affixed to an opposed face - Page 2 of Claims -on the other of said disks, one of said disks being rotationally mounted for rotation in relation to the other of said disks, whereby the partially separated and inter-mingled fibres transported to said restricted zone are further separated and intermingled when said one disk is rotated relative to the other of said disks; and (c) first feed means for transporting said partially separated and inter-mingled collection of fibres from said grinding means to said restricted zone; and (d) second feed means for transporting the partially separated and inter-mingled collection of fibres through said restricted zone and for trans-porting resulting loosely inter-mingled fibres from said restricted zone to a receiving container.
9. Apparatus as defined in claim 8 wherein said second feed means includes means for directing an air stream onto the partially separated and intermingled collection of fibres to cause the partially separated and intermingled collection of fibres to move into said restricted zone and to transport said loosely intermingled fibres to the - Page 3 of Claims -receiving container.
10. Apparatus as defined in claim 9, wherein said grinding means comprises:
(a) a vertically orientated belt having an abrasive surface, and means for driving said belt; and (b) means for pressing said compacted bale against said abrasive surface whereby the belt when driven, grinds the compacted pulp.
(a) a vertically orientated belt having an abrasive surface, and means for driving said belt; and (b) means for pressing said compacted bale against said abrasive surface whereby the belt when driven, grinds the compacted pulp.
11. Apparatus as defined in claim 10 wherein said first feed means comprises a vertically disposed feed-hopper positioned generally below said belt and communicating with said restricted zone to receive said partially separated and intermingled collection of fibres falling under gravity, and to direct such fibres to said restricted zone.
12. Apparatus as defined in claim 10 wherein said means for pressing said compacted pulp against said abrasive surface comprises spaced, generally horizontal, upper and lower conveyor belts, said upper conveyor belt being upwardly movable against restoring force means for exerting a downward restoring force on the upper conveyor belt and said upper conveyor belt being spaced relative to said lower conveyor belt so as to be forced upwardly by the compacted pulp when the pulp is placed there between, said belts thereby gripping such pulp.
13. Apparatus as defined by claim 9, wherein - Page 4 of Claims -said means for directing an air stream comprises a plurality of circumferentially spaced radially outward projecting paddles affixed to the periphery of said rotational disk for forcing air outwardly toward the receiving container.
14. Apparatus as defined in claim 10, wherein said grinding means further comprises a hydraulic ram for pressing said bale against the abrasive surface of said grinding belt with a preselected force.
- Page 5 of Claims -
- Page 5 of Claims -
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA314,454A CA1126466A (en) | 1978-10-26 | 1978-10-26 | Method and apparatus for the production of cellulosic insulation from virgin ground wood flash-dried pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA314,454A CA1126466A (en) | 1978-10-26 | 1978-10-26 | Method and apparatus for the production of cellulosic insulation from virgin ground wood flash-dried pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126466A true CA1126466A (en) | 1982-06-29 |
Family
ID=4112713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA314,454A Expired CA1126466A (en) | 1978-10-26 | 1978-10-26 | Method and apparatus for the production of cellulosic insulation from virgin ground wood flash-dried pulp |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1126466A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146840A2 (en) * | 1983-12-05 | 1985-07-03 | Manville Service Corporation | Hybrid blowing insulation |
| CN110219194A (en) * | 2019-06-06 | 2019-09-10 | 潍坊汇胜绝缘技术有限公司 | A kind of production method for eliminating insulating board surface steam passage print |
-
1978
- 1978-10-26 CA CA314,454A patent/CA1126466A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146840A2 (en) * | 1983-12-05 | 1985-07-03 | Manville Service Corporation | Hybrid blowing insulation |
| EP0146840A3 (en) * | 1983-12-05 | 1985-08-21 | Manville Service Corporation | Hybrid blowing insulation |
| CN110219194A (en) * | 2019-06-06 | 2019-09-10 | 潍坊汇胜绝缘技术有限公司 | A kind of production method for eliminating insulating board surface steam passage print |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |