CA1129287A - Ridge-in-groove firelog starter - Google Patents
Ridge-in-groove firelog starterInfo
- Publication number
- CA1129287A CA1129287A CA356,283A CA356283A CA1129287A CA 1129287 A CA1129287 A CA 1129287A CA 356283 A CA356283 A CA 356283A CA 1129287 A CA1129287 A CA 1129287A
- Authority
- CA
- Canada
- Prior art keywords
- groove
- firelog
- ridge
- log
- wax
- 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
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Abstract
A composition firelog made of a cellulosic material intimately mixed with a wax and including as a fire starter means, at least one longitudinal slot extending along the outer surface of the firelog having a longitudinal ridge extending parallel to and within the slot.
Description
llZ928~
005This invention relates to composition firelogs and 006 m~ore particularly relates to a composition firelog including a 007 fire-starter means. The fire-starter means allows rapid, even 008 ignition of the composition firelog without using any 009 additional flammable materials.
010 Composition firelogs are well known and are commer-011 cially available. The commercially available composition fire-012 logs are of two general types. The first type consists of saw-013 dust compressed with sufficient force to make the composition 014 log relatively dense and to cause the sawdust particles to 015 adhere to each other. The sawdust composition log may contain 016 a small amount of a binding agent to help maintain its 017 integrity. The other type of composition log is an intimate 018 mixture of wax and a cellulosic material. The cellulosic 019 material is generally a sawdust, but may be another material 020 such as waste paper, wood chips, or other types of cellulosic 021 particles. I
023 A serious disadvantage of the composition firelog is 024 that it must be started by using accessory combustible 025 materials, materials which are inconvenient to use or generally 026 more flammable than the firelog itself. It would be advan-027 tageous for the firelog user to be able to ignite the firelog 028 directly. U.S. Patent 1,310,004 describes a fuel stick made of 029 pressed material and having longitudinal grooves for retaining 030 wires. U.S. Patent 1,050,535 describes an artificial firelog 031 including petroleum and U.S. Patent 2,789,890 describes one 032 covered with an inflammable wrapper. U.S. Patent 3,726,652 033 describes a means of achieving ignition of a firelog by using a 034 solid fuel igniter.
036 In an artificial firelog consisting of an elongated 037 body comprising about 25-50 weight percent of a cellulosic , , l~Z928~7 002 material and 50-75 weight percent of a wax having a congealing 003 point or AMP of 50-95C, the improvement comprising at least 004 one longitudinal groove extending substantially along the outer OOS surface of said body, said longitudinal groove having a longi-006 tudinal ridge extending parallel to and within said groove.
008 FIG. 1 is a perspective view of an artificial firelog 009 incorporating one embodiment of the fire-starting means of the 010 present invention.
011 FIG. 2 is a cross-sectional view of the artificial 012 firelog of FIG. 1.
013 ~ETAILED DESCRIPTION OF THE INVENTION
014 Applicants found that a wax/sawdust firelog can be 015 made easily ignitable by the inclusion of an elongitudinal 016 groove, slot or notch in its outer surface, if, and only if, 017 the longitudinal groove also contained a ridge, preferably a 018 thin ridge of dimensions appreciably narrower and of less 019 height than the groove. The discovery of this simple fire-020 starter means is a substantial improvement over previous fire-021 starter means which comprise contacting the firelog with more 022 combustible materials or filling a groove with more inflammable 023 materials than the artificial firelog composition.
024 In use, a match or ignition means is applied to the 025 ridge at one or both ends of the groove. The thin ridge is 026 easily heated and ignites more easily than the groove edges.
027 The ridge and its critical spatial relationship to the groove, 028 propagates the flame along the length of the log more quickly 029 than an ignited groove alone. No other ignition fuel is 030 needed, but an ignitable wrapper may also be included. In 031 positioning the log in the fireplace, the ridge-in-groove 032 indentation should be located on the substantially upper most 033 portion of the firelog. The firelog will contain at least one 034 ridge-in-groove, but may contain two or more ridge-in-groove 035 indentations in its outer surface. With two, three or more 036 ridge-in-groove indentations in the firelog, there will be 037 little need to rotate the log after placement in the fireplace 11~928~7 001 ~3~
002 in order to achieve easy ignition. When the ~aximum number of 003 ridge-in-groove indentations (about ten for a four-inch 004 diameter log) is utilized, the log will have the appearance of 005 alternating wide (about 1/2") and narrow (about 1/4") ridges 006 separated by about 1/4" wide grooves.
007 Time-lapse motion pictures directly comparing the 008 ignition characteristics of a plain groove vs. ridge-in-groove, 009 show the advantages for the ridge-in-groove include, more 010 reliable ignition, much faster flame propagation along the 011 length of the log, and shorter overall ignition time.
012 The cross-sectional shape of the ridge-in-groove has 013 not been found to be as important as the relative dimensions.
014 That is, the groove may be a slot or a notch having square, 015 round or V-shaped bottom portions. The ridge may be rounded, 016 rectangular or have an inverted V cross-section. Preferably, 017 the ridge is roughened by the natural adhesion of the composi-018 tion to the die from which it is extruded ! to form a rough 019 ridge, as shown in FIG. 1, which is even more easily ignited.
020 Roughening of the ridge surface can be enhanced but the choice 021 of a forming die, for example the use of a die having a 022 slightly funnel shape will assist the formation of rough spots 023 on the ridge.
024 It is preferred that the groove have an overall 025 maximum width of from about 1/2 to about 1 inch and an overall 026 maximum depth of similar dimension. The ridge within the 027 groove must, of course, be of maximum width less than that of 028 the groove, and critically, will be of a width such that there 029 is at least 1/4~ of air space on either side of the ridge 030 between the outer surface of the ridge and the surface of the 031 groove. The height of the ridge is not critical, but will 032 normally be chosen to be less than the depth of the groove in 033 order to maintain the integrity of the ridge during wrapping, 034 shipping and storage of the artificial firelog.
035 While the artificial firelog containing at least one 035 ridge-in-groove is easily produced by extrusion of the firelog 037 in its usual production, the ridge-in-groove may also be formed - llZ928~
001 _4_ 0û2 later by the user of the firelog in the following manner.
003 During the manufacture of the firelog, two filamentary-means, 004 such as strings, wires, rods or other flexible elongated 005 bodies, will be embedded longitudinally at a depth of about 006 1/4-1 inch below the surface of said firelog and about 1/4-1/2 007 inch apart. Removal of said embedded filamentary-means prior 008 to ignition of the firelog will produce the ridge-in-groove 009 firelog of the present invention ready for ignition.
010 Preferably, the ridge-in-groove firelog of the present 011 invention is produced by longitudinally embedding two 012 filamentary-means about 1/2" below the surface of said firelog.
013 The composition artificial firelogs useful in this 014 invention comprise an intimate mixture of a cellulosic material OlS and a wax. These firelogs are prepared by melting the wax and 016 combining the molten wax with the cellulosic material. The 017 intimately mixed mass of the wax and the cellulosic material is 018 allowed to cool and then placed in the feed to an extruding 01~ machine, generally a screw extruder. The mixture is extruded 020 as a continuous round or oval shaped rod of about 2 to 6 inches 021 in diameter, generally about 4" in diameter. The continuous 022 rod is then cut into lengths of from 6 to 18 inches, and 023 generally about 15" in length. The extruder would normally con-024 tain a die which would form the ridge-in-groove indentation in 025 the rod as it is extruded. It is generally preferred that the 026 die have the approximate shape and dimension to produce a ridge-027 in-groove of the aforementioned dimensions, and preferably, 028 that the die be tapered to produce the aforementioned roughness 029 in the ridge.
030 The cellulosic material useful in the composition 031 firelogs of this invention include practically any combustible 032 cellulosic material. Examples of suitable materials include 033 sawdust, paper, particularly paper waste, and, more particular-034 ly, waste paper, fibers, particularly waste fibers, such as 035 cotton fibers, hemp fibers, waste vegetable matter, such as 036 coconut husk, straw, leaves, and the like.
037 A variety of waxes are suitable in preparing the .
llZ~Z87 002 composition log useful in this invention. Suitable waxes 003 include unrefined and refined waxes, with or without wax 004 additives. Suitable refined waxes include those having an AMP
005 (Average Melting Point) of about 50-95C, preferably of about 006 50-75C. These refined waxes generally contain in the neighbor-007 hood of about 1% oil. Suitable unrefined waxes include slack 008 waxes which have an oil content of between 25 and 50 weight 009 percent, generally 40-50~ by weight. Because their high oil 010 content, slack waxes generally do not have a well-defined 011 melting point as determined by the AMP method. Suitable slack 012 waxes generally have a congealing point of between 50 and 95C.
013 Because of their lower cost, the slack waxes are generally pre-014 ferred over the refined waxes.
015 Composition firelogs containing sawdust typically con-016 tain between 50-60% by weight wax and 40-50~ by weight sawdust.
017 Composition firelogs made from waste paper typically contain 018 75-65~ by weight wax and 35-25% by weight of waste paper. The 019 composition of the log is adjusted to yield the lowest wax con-020 tent consistent with good burning qualities.
021 Typically commercial firelogs are prepared from slack 022 waxes which have a high oil content. For this reason, they are 023 usually inserted into a paper bag, generally a polyethylene-024 coated paper bag, to keep the oil of the slack wax from soaking 025 into objects with which the artificial firelog may come into 026 contact.
027 The firelogs including the ridge-in-groove firelog of 028 this invention can also be and desirably are, inserted into a 029 sack. However, the sack or wrapping, when it burns, typically 030 forms a certain amount of ash which can interfere with the even-031 ness of the ignition obtained from the fire starting ridge-in-032 groove of this invention. For this reason, it is preferred 033 that the sack containing the firelog be slit along the length 034 of the firelog adjacent to the ridge-in-groove. The slit sack 035 is then opened from the ridge-in-groove which may then be 036 easily ignited. The ash then formed when the sack burns does 037 not interfere with the flame propagation along the ridge-in-~292~17 002 groove. Alternatively, and more preferably, the sack into 003 which the firelog is inserted has a "zipper strip" running the 004 length of the sack. The "zipper strip" is nothing but two 005 longitudinally oriented filamentary-means, such as strings, 006 which may also be imbedded in the log, as heretofore described, 007 to both open the wrapping and form the ridge-in-groove in one 008 step. The user places the firelog in the fireplace, preferably 009 on a grate, pulls the zipper strip which opens the sack from 010 end to end, and the resulting ridge-in-groove fire-starter is 011 then ignited. This causes rapid, even ignition of the firelog.
012 The paper wrapper generally catches fire and is rapidly 013 consumed.
014 The following example is included for further under-015 standing of the invention.
016 The following are the results of a side-by-side 017 burning test comparing a plain groove log with ridge-in-groove 018 ~RIG) log. The test was recorded by a time-lapse movie camera.
023 - Plain Groove RIG
024 Number of Ends Ignited 2 2 025 Tptal Top Ignition Time, 026 Minutes 20 5 029 In other single-log tests, the plain groove log has 030 required as long as one-half hour for the flame to spread 031 across the top of the log while the RIG log has consistently 032 done so in ten minutes or 1ess .
' .
005This invention relates to composition firelogs and 006 m~ore particularly relates to a composition firelog including a 007 fire-starter means. The fire-starter means allows rapid, even 008 ignition of the composition firelog without using any 009 additional flammable materials.
010 Composition firelogs are well known and are commer-011 cially available. The commercially available composition fire-012 logs are of two general types. The first type consists of saw-013 dust compressed with sufficient force to make the composition 014 log relatively dense and to cause the sawdust particles to 015 adhere to each other. The sawdust composition log may contain 016 a small amount of a binding agent to help maintain its 017 integrity. The other type of composition log is an intimate 018 mixture of wax and a cellulosic material. The cellulosic 019 material is generally a sawdust, but may be another material 020 such as waste paper, wood chips, or other types of cellulosic 021 particles. I
023 A serious disadvantage of the composition firelog is 024 that it must be started by using accessory combustible 025 materials, materials which are inconvenient to use or generally 026 more flammable than the firelog itself. It would be advan-027 tageous for the firelog user to be able to ignite the firelog 028 directly. U.S. Patent 1,310,004 describes a fuel stick made of 029 pressed material and having longitudinal grooves for retaining 030 wires. U.S. Patent 1,050,535 describes an artificial firelog 031 including petroleum and U.S. Patent 2,789,890 describes one 032 covered with an inflammable wrapper. U.S. Patent 3,726,652 033 describes a means of achieving ignition of a firelog by using a 034 solid fuel igniter.
036 In an artificial firelog consisting of an elongated 037 body comprising about 25-50 weight percent of a cellulosic , , l~Z928~7 002 material and 50-75 weight percent of a wax having a congealing 003 point or AMP of 50-95C, the improvement comprising at least 004 one longitudinal groove extending substantially along the outer OOS surface of said body, said longitudinal groove having a longi-006 tudinal ridge extending parallel to and within said groove.
008 FIG. 1 is a perspective view of an artificial firelog 009 incorporating one embodiment of the fire-starting means of the 010 present invention.
011 FIG. 2 is a cross-sectional view of the artificial 012 firelog of FIG. 1.
013 ~ETAILED DESCRIPTION OF THE INVENTION
014 Applicants found that a wax/sawdust firelog can be 015 made easily ignitable by the inclusion of an elongitudinal 016 groove, slot or notch in its outer surface, if, and only if, 017 the longitudinal groove also contained a ridge, preferably a 018 thin ridge of dimensions appreciably narrower and of less 019 height than the groove. The discovery of this simple fire-020 starter means is a substantial improvement over previous fire-021 starter means which comprise contacting the firelog with more 022 combustible materials or filling a groove with more inflammable 023 materials than the artificial firelog composition.
024 In use, a match or ignition means is applied to the 025 ridge at one or both ends of the groove. The thin ridge is 026 easily heated and ignites more easily than the groove edges.
027 The ridge and its critical spatial relationship to the groove, 028 propagates the flame along the length of the log more quickly 029 than an ignited groove alone. No other ignition fuel is 030 needed, but an ignitable wrapper may also be included. In 031 positioning the log in the fireplace, the ridge-in-groove 032 indentation should be located on the substantially upper most 033 portion of the firelog. The firelog will contain at least one 034 ridge-in-groove, but may contain two or more ridge-in-groove 035 indentations in its outer surface. With two, three or more 036 ridge-in-groove indentations in the firelog, there will be 037 little need to rotate the log after placement in the fireplace 11~928~7 001 ~3~
002 in order to achieve easy ignition. When the ~aximum number of 003 ridge-in-groove indentations (about ten for a four-inch 004 diameter log) is utilized, the log will have the appearance of 005 alternating wide (about 1/2") and narrow (about 1/4") ridges 006 separated by about 1/4" wide grooves.
007 Time-lapse motion pictures directly comparing the 008 ignition characteristics of a plain groove vs. ridge-in-groove, 009 show the advantages for the ridge-in-groove include, more 010 reliable ignition, much faster flame propagation along the 011 length of the log, and shorter overall ignition time.
012 The cross-sectional shape of the ridge-in-groove has 013 not been found to be as important as the relative dimensions.
014 That is, the groove may be a slot or a notch having square, 015 round or V-shaped bottom portions. The ridge may be rounded, 016 rectangular or have an inverted V cross-section. Preferably, 017 the ridge is roughened by the natural adhesion of the composi-018 tion to the die from which it is extruded ! to form a rough 019 ridge, as shown in FIG. 1, which is even more easily ignited.
020 Roughening of the ridge surface can be enhanced but the choice 021 of a forming die, for example the use of a die having a 022 slightly funnel shape will assist the formation of rough spots 023 on the ridge.
024 It is preferred that the groove have an overall 025 maximum width of from about 1/2 to about 1 inch and an overall 026 maximum depth of similar dimension. The ridge within the 027 groove must, of course, be of maximum width less than that of 028 the groove, and critically, will be of a width such that there 029 is at least 1/4~ of air space on either side of the ridge 030 between the outer surface of the ridge and the surface of the 031 groove. The height of the ridge is not critical, but will 032 normally be chosen to be less than the depth of the groove in 033 order to maintain the integrity of the ridge during wrapping, 034 shipping and storage of the artificial firelog.
035 While the artificial firelog containing at least one 035 ridge-in-groove is easily produced by extrusion of the firelog 037 in its usual production, the ridge-in-groove may also be formed - llZ928~
001 _4_ 0û2 later by the user of the firelog in the following manner.
003 During the manufacture of the firelog, two filamentary-means, 004 such as strings, wires, rods or other flexible elongated 005 bodies, will be embedded longitudinally at a depth of about 006 1/4-1 inch below the surface of said firelog and about 1/4-1/2 007 inch apart. Removal of said embedded filamentary-means prior 008 to ignition of the firelog will produce the ridge-in-groove 009 firelog of the present invention ready for ignition.
010 Preferably, the ridge-in-groove firelog of the present 011 invention is produced by longitudinally embedding two 012 filamentary-means about 1/2" below the surface of said firelog.
013 The composition artificial firelogs useful in this 014 invention comprise an intimate mixture of a cellulosic material OlS and a wax. These firelogs are prepared by melting the wax and 016 combining the molten wax with the cellulosic material. The 017 intimately mixed mass of the wax and the cellulosic material is 018 allowed to cool and then placed in the feed to an extruding 01~ machine, generally a screw extruder. The mixture is extruded 020 as a continuous round or oval shaped rod of about 2 to 6 inches 021 in diameter, generally about 4" in diameter. The continuous 022 rod is then cut into lengths of from 6 to 18 inches, and 023 generally about 15" in length. The extruder would normally con-024 tain a die which would form the ridge-in-groove indentation in 025 the rod as it is extruded. It is generally preferred that the 026 die have the approximate shape and dimension to produce a ridge-027 in-groove of the aforementioned dimensions, and preferably, 028 that the die be tapered to produce the aforementioned roughness 029 in the ridge.
030 The cellulosic material useful in the composition 031 firelogs of this invention include practically any combustible 032 cellulosic material. Examples of suitable materials include 033 sawdust, paper, particularly paper waste, and, more particular-034 ly, waste paper, fibers, particularly waste fibers, such as 035 cotton fibers, hemp fibers, waste vegetable matter, such as 036 coconut husk, straw, leaves, and the like.
037 A variety of waxes are suitable in preparing the .
llZ~Z87 002 composition log useful in this invention. Suitable waxes 003 include unrefined and refined waxes, with or without wax 004 additives. Suitable refined waxes include those having an AMP
005 (Average Melting Point) of about 50-95C, preferably of about 006 50-75C. These refined waxes generally contain in the neighbor-007 hood of about 1% oil. Suitable unrefined waxes include slack 008 waxes which have an oil content of between 25 and 50 weight 009 percent, generally 40-50~ by weight. Because their high oil 010 content, slack waxes generally do not have a well-defined 011 melting point as determined by the AMP method. Suitable slack 012 waxes generally have a congealing point of between 50 and 95C.
013 Because of their lower cost, the slack waxes are generally pre-014 ferred over the refined waxes.
015 Composition firelogs containing sawdust typically con-016 tain between 50-60% by weight wax and 40-50~ by weight sawdust.
017 Composition firelogs made from waste paper typically contain 018 75-65~ by weight wax and 35-25% by weight of waste paper. The 019 composition of the log is adjusted to yield the lowest wax con-020 tent consistent with good burning qualities.
021 Typically commercial firelogs are prepared from slack 022 waxes which have a high oil content. For this reason, they are 023 usually inserted into a paper bag, generally a polyethylene-024 coated paper bag, to keep the oil of the slack wax from soaking 025 into objects with which the artificial firelog may come into 026 contact.
027 The firelogs including the ridge-in-groove firelog of 028 this invention can also be and desirably are, inserted into a 029 sack. However, the sack or wrapping, when it burns, typically 030 forms a certain amount of ash which can interfere with the even-031 ness of the ignition obtained from the fire starting ridge-in-032 groove of this invention. For this reason, it is preferred 033 that the sack containing the firelog be slit along the length 034 of the firelog adjacent to the ridge-in-groove. The slit sack 035 is then opened from the ridge-in-groove which may then be 036 easily ignited. The ash then formed when the sack burns does 037 not interfere with the flame propagation along the ridge-in-~292~17 002 groove. Alternatively, and more preferably, the sack into 003 which the firelog is inserted has a "zipper strip" running the 004 length of the sack. The "zipper strip" is nothing but two 005 longitudinally oriented filamentary-means, such as strings, 006 which may also be imbedded in the log, as heretofore described, 007 to both open the wrapping and form the ridge-in-groove in one 008 step. The user places the firelog in the fireplace, preferably 009 on a grate, pulls the zipper strip which opens the sack from 010 end to end, and the resulting ridge-in-groove fire-starter is 011 then ignited. This causes rapid, even ignition of the firelog.
012 The paper wrapper generally catches fire and is rapidly 013 consumed.
014 The following example is included for further under-015 standing of the invention.
016 The following are the results of a side-by-side 017 burning test comparing a plain groove log with ridge-in-groove 018 ~RIG) log. The test was recorded by a time-lapse movie camera.
023 - Plain Groove RIG
024 Number of Ends Ignited 2 2 025 Tptal Top Ignition Time, 026 Minutes 20 5 029 In other single-log tests, the plain groove log has 030 required as long as one-half hour for the flame to spread 031 across the top of the log while the RIG log has consistently 032 done so in ten minutes or 1ess .
' .
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an artificial firelog consisting of an elongated body comprising about 25-50% by weight of a cellulosic material and about 50-75 weight percent of a wax having a congealing point or AMP of about 50-95°C, the improvement comprising at least one longitudinal groove extending substantially along the outer surface of said body, said longitudinal groove having a longitudinal ridge extending parallel to and within said groove.
2. A method of producing an artificial firelog by longi-tudinally imbedding beneath the surface of said firelog two or more filamentary-means, such that, removal of said imbedded filamentary-means produces the longitudinally grooved firelog of Claim 1.
3. A firelog according to Claim 1, wherein said groove is of a depth of about 1/2 - 1 inch and a width of about 1/2 -1 inch and said ridge is of a height less than about 1/2", of a width less than about 1/2" and said ridge is separated from the walls of said groove by about 1/4".
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8468979A | 1979-10-15 | 1979-10-15 | |
| US84,689 | 1979-10-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1129287A true CA1129287A (en) | 1982-08-10 |
Family
ID=22186610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA356,283A Expired CA1129287A (en) | 1979-10-15 | 1980-07-16 | Ridge-in-groove firelog starter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1129287A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6508849B1 (en) | 2000-05-26 | 2003-01-21 | La Corde De Bois Inc. | Fire starter as sole fuel to quickly ignite a log of wood |
-
1980
- 1980-07-16 CA CA356,283A patent/CA1129287A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6508849B1 (en) | 2000-05-26 | 2003-01-21 | La Corde De Bois Inc. | Fire starter as sole fuel to quickly ignite a log of wood |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |