Plywood veneer of edge-bonded wet wood pieces and method of making same
阅读：588发布：2022-01-10
专利汇可以提供Plywood veneer of edge-bonded wet wood pieces and method of making same专利检索，专利查询，专利分析的服务。并且A method for bonding wet woods with specific polyurethane type liquid adhesives capable of bonding wet flitches or logs, filling and bonding cracks of wet logs, or splicing wet veneers. The wet woods bonded according to the above-mentioned method may be cut to give slices and veneers. The method, which is quite useful from the industrial standpoint, has been accomplished by the utilization of characteristics of specific liquid polyisocyanate prepolymers.，下面是Plywood veneer of edge-bonded wet wood pieces and method of making same专利的具体信息内容。
1. A PLYWOOD VENEER COMPRISING A PLURALITY OF VENEER STRIPS BONDED TO ONE ANOTHER BY FLUE LINES, SAID STRIPS BEING BONDED WITH A WATER-CURED ADHESIVE COMPOSITION CONSISTING ESSENTIALLY OF A HYDROPHILIC, POLYFUNCTIONAL, LIQUID POLYISOCYANATE PRE-
2. A plywood veneer in accordance with claim 1, wherein said adhesive is cured at room temperature by the presence of water in a log from which said strips are cut with a rotary lathe, the amount of water in said log being more than 25% by weight (dry base).
3. A plywood veneer in accordance with claim 1, wherein the required polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and is water-soluble.
4. A plywood veneer in accordance with claim 1, wherein the required polyisocyanate prepolymer is an aliphatic polyisocyanate prepolymer.
5. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition comprising a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
6. A method according to claim 5, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and is water-soluble.
7. A method according to claim 5, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and a polyester-urethane chain.
8. A method according to claim 5, wherein the liquid polyisocyanate prepolymer is an aliphatic polyisocyanate prepolymer.
9. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition comprising a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and water as a crosslinking adjuvant, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
10. A method according to claim 9, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and is water-soluble.
11. A method according to claim 9, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and a polyester-urethane chain.
12. A method according to claim 9, wherein the liquid polyisocyanate prepolymer is an aliphatic polyisocyanate prepolymer.
13. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition comprising a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000 and an anhydrous solvent as viscosity regulator and defoaming agent, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
14. A method according to claim 13, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and is water-soluble.
15. A method according to claim 13, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and a polyester-urethane chain.
16. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, water as a crosslinking adjuvant, and a hardener, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which in present in an amount of more than 25% by weight (dry base).
17. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, water as crosslinking Adjuvant, a hardener, and an anhydrous solvent as viscosity regulator and defoaming agent, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
18. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and a filler as reinforcing agent and thixotroropy-imparting agent, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
19. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, water as crosslinking adjuvant, and a filler as reinforcing agent and thixotropy-imparting agent, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
20. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, an anhydrous solvent as viscosity regulator and defoaming agent, and a filler as reinforcing agent and thixotropy-imparting agent, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of more than 25% by weight (dry base).
21. A method according to claim 20, wherein the filler as reinforcing agent and thixotropy-imparting agent is at least one organic powder selected from the group consisting of wood flour, resin powder, grain powder, rice hull powder, pulp powder and linter powder.
22. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer, containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and a colorant, and then subjecting the thus treated woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of 25% by weight (dry base).
23. A method for bonding wet woods, which comprises applying to wet woods a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and a foam-controlling agent, and then subjecting the thus treated wet woods to bonding and curing at room temperature by the reaction of said adhesive composition with water in woods which is present in an amount of 25% by weight (dry base).
24. A method for producing a wet veneer for plywood which is boNded edgewise to a desired width and has a glue line parallel to the fiber, which comprises filling cracks of a wet log with a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, curing the said adhesive composition at room temperature by the reaction with water in said log which is present in an amount of more than 25% by weight (dry base), and then cutting the resulting log with a rotary lathe.
25. A method for producing a wet veneer for plywood which is bonded edgewise to a desired width and has a glue line perpendicular to the fiber direction, which comprises applying to the end surfaces of wet short logs a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, putting the thus treated surfaces of wet short logs in contact with one another, curing said adhesive composition at room temperature by the reaction with water in said logs which is present in an amount of more than 25% by weight (dry base), and then cutting the resulting log with a rotary lathe.
26. A method for producing a wet decorative sliced veneer which is bonded edgewise to a desired width, which comprises applying to wet flitches a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, putting the thus treated flitches in contact with one another, curing said adhesive composition at room temperature by the reaction with water in said flitches which is present in an amount of more than 25% by weight (dry base), and then slicing the resulting bonded wet flitches.
27. A method for producing a wet veneer for plywood which is bonded edgewise to a desired width, which comprises splicing narrow wet veneers with a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and then curing said adhesive composition at room temperature by the reaction with water in said veneers which is present in an amount of more than 25% by weight (dry base).
28. A method according to claim 27, wherein the narrow veneers are spliced in parallel to the fiber direction.
29. A method according to claim 27, wherein the narrow veneers are spliced perpendicularly to the fiber direction.
30. A method according to claim 25, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and is water-soluble.
31. A method according to claim 26, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and is water-soluble.
32. A method according to claim 26, wherein the liquid polyisocyanate prepolymer has the main chain consisting of a polyalkylene-ether-urethane chain and a polyester-urethane chain.
33. A method according to claim 26, wherein the liquid polyisocyanate prepolymer is an aliphatic polyisocyanate prepolymer.
34. A method for producing a wet veneer for plywood which is bonded edgewise to a desired width and has a glue line parallel to the fiber direction, which comprises filling cracks of a wet log with a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liQuid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and water as crosslinking adjuvant, curing said adhesive composition at room temperature by the reaction with water in said log which is present in an amount of more than 25% by weight (dry base), and then cutting the resulting log with a rotary lathe.
35. A method for producing a wet veneer for plywood which is bonded edgewise to a desired width, which comprises splicing narrow wet veneers with a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 2 to 15% by weight and a number average molecular weight of 1,000 to 20,000, and water as crosslinking adjuvant, and then curing said adhesive composition at room temperature by the reaction with water in said veneers which is present in an amount of more than 25% by weight (dry base).
36. A method for producing a wet veneer for plywood which is bonded edgewise to a desired width and has a glue line perpendicular to the fiber direction, which comprises applying to the end surfaces of wet short logs a liquid adhesive composition consisting essentially of a hydrophilic, polyfunctional, liquid polyisocyanate prepolymer containing substantially no active hydrogen group and having an NCO group content of 1,000 to 20, 000, and water as crosslinking adjuvant, putting the thus treated surfaces of wet short logs in contact with one another, curing said adhesive composition at room temperature by the reaction with water in said logs which is present in an amount of more than 25% by weight (dry base), and then cutting the resulting log with a rotary lathe.
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