Lignocellulose fiber-resin composite material
A method of making a formed, dried lignocellulose fiber material comprising (a) providing an aqueous lignocellulose fiber pulp slurry having an effective consistency; (b) de-watering the slurry to provide a de-watered material at an effective de-watering rate under an effective pressure to prevent or reduce the formation of fissures and voids within the material; (c) drying an effective amount of the de-watered material at an effective temperature and period of time to provide the formed, dried lignocellulose fiber material having a thickness of at least 5 mm. The formed, dried lignocellulose material may be used to make a lignocellulose fiber-resin composite material of use as a cost effective structural member, as a substitute for steel, in, for example, bridges, processing equipment, and the like.
1. A method of making a rigid lignocellulose fiber-resin composite structural material, the method consisting essentially of:
(a) providing an aqueous lignocellulose fiber pulp slurry having an effective consistency;
(b) de-watering said slurry by applying a compression pressure to provide a de-watered material at an effective de-watering rate under an effective pressure to prevent or reduce the formation of fissures and voids within said material;
(c) drying an effective amount of said de-watered material at an effective temperature and period of time to provide said formed, dried lignocellulose fiber material of a shape having a thickness of at least 5 mm;
(d) impregnating said dried formed fiber material with a liquid thermoset resin under an effective pressure for an effective period of time to effect impregnation of said resin in said dried formed fiber material at a desired rate and to a desired degree to produce a resin-treated material; and
(e) curing said resin in said resin-treated material to produce the composite material.
2. A method according to claim 1 , wherein said impregnation step (d) is carried out at a temperature of 5-25° C.
3. A method according to claim 1 , further consisting essentially of form-pressing said resin-treated material prior to curing step (e).
4. A method according to claim 3 , wherein said form-pressing step consisting essentially of extruding said material or sandwiching said material.
5. A method according to claim 1 , wherein said curing step (e) is initially carried out at an effective temperature of below about 100° C.
6. A method according to claim 1 , wherein said composite material has a thickness of at least 2 cm while having a greater length and width.
7. A method according to claim 6 , wherein said composite material is resistance to deformation.
8. A method according to claim 6 , wherein said composite material has a greater strength to weight ratio than steel.