# US 8,454,790 B2 · Method of manufacturing a hard wood strand product > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,454,790 B2 - Document ID: US8454790B2 - Status: Granted - Kind: B2 - Application number: 12/775,685 - Filed: 2010-05-07 - Published: 2010-10-21 - Granted: 2013-06-04 - Earliest claimed: 2004-01-27 - Assignees: Lignor Limited - Applicants: Peter Edward Burton; Graham Thomas Coulthard - Inventors: Peter Edward Burton; Graham Thomas Coulthard - Web page: https://patentgrep.com/patent/US8454790B2 ## CPC - B27N 3/04: from fibres - Y10T 156/10: Methods of surface bonding and/or assembly therefor - Y10T 428/24: Structurally defined web or sheet [e.g., overall dimension, etc.] - Y10T 428/24132: including grain, strips, or filamentary elements in different layers or components parallel - Y10T 428/249921: Web or sheet containing structurally defined element or component - Y10T 428/249925: Fiber-containing wood product [e.g., hardboard, lumber, or wood board, etc.] - Y10T 428/249942: Fibers are aligned substantially parallel - Y10T 428/249945: Carbon or carbonaceous fiber - Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension - Y10T 428/31551: Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] - Y10T 428/31989: Of wood - B27N: MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL (containing cementitious material B28B; shaping of substances in a plastic state B29C; fibreboards made from fibrous suspensions D21J; drying F26B17/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method of manufacturing a hard wood strand product, comprising the steps of harvesting logs of eucalypts from plantation trees having an age between 8 years and 12 years, forming strands from the logs, adding a binder including a polymeric methane di-isocyanate resin and a wax to the strands, forming a mat with the strands, and pressing and heating the mat using a press to form the strand product. ## Claims ### Claim 1 A method of manufacturing a hard wood strand product, comprising the steps of: a) harvesting logs of eucalypts from plantation trees having an age between 8 years and 12 years; b) forming strands from the logs; c) adding a binder including a polymeric methane di-isocyanate resin and a wax to the strands; d) forming a mat with the strands; and, e) pressing and heating the mat using a press to form the strand product. ### Claim 2 (depends on 1) A method according to claim 1 wherein the plantation trees are a Eucalyptus species selected from the group consisting of Bluegum (Eucalyptus globulus) and Sydney Bluegum (Eucalyptus saligna). ### Claim 3 (depends on 1) A method according to claim 1 wherein the strands are formed having an average length between 145 mm and 180 mm. ### Claim 4 (depends on 1) A method according to claim 1 wherein the strands are formed having an average width of about 10 to 25 mm. ### Claim 5 (depends on 1) A method according to claim 1 wherein the strands are formed having an average thickness between 0.5 mm and 1.5 mm. ### Claim 6 (depends on 1) A method according to claim 1, additionally comprising substantially aligning the strands. ### Claim 7 (depends on 6) A method according to claim 6 wherein at least 70% of the strands are fully aligned. ### Claim 8 (depends on 1) A method according to claim 1 wherein the strand product is formed having a density of between 600 kg/m3 to 850 kg/m3. ### Claim 9 (depends on 1) A method according to claim 1 wherein the strand product is formed as a lumber or board product. ### Claim 10 (depends on 1) A method according to claim 1 wherein the strand product is formed having a modulus of elasticity ≧14,000 N/mm2. ### Claim 11 (depends on 1) A method according to claim 1 wherein the logs are harvested from plantation trees having a diameter between 150 mm and 200 mm. ### Claim 12 (depends on 1) A method according to claim 1, additionally comprising debarking the logs and passing the logs through a strander to form the strands. ### Claim 13 (depends on 1) A method according to claim 1, additionally comprising drying the strands to less than 5% moisture. ### Claim 14 (depends on 1) A method according to claim 1, additionally comprising forming the mat with a plurality of layers, each layer having substantially aligned strands. ### Claim 15 (depends on 14) A method according to claim 14, additionally comprising forming the mat including at least a top layer, a central layer and a bottom layer, each said layer having substantially aligned strands within a respective layer, wherein the substantially aligned strands of the central layer are oriented perpendicularly to the substantially aligned strands of at least one of the top layer and the bottom layer. ### Claim 16 (depends on 14) A method according to claim 14, additionally comprising forming the mat including a top layer and a bottom layer each having strands substantially aligned in a first direction, and a central layer having strands substantially aligned in a second direction substantially perpendicular to the first direction. ### Claim 17 (depends on 1) A method according to claim 1 wherein the strand product is formed having an internal bond strength of ≧1.21 N/mm2.