Formaldehyde-free plywood preparation process
A preparation process and technology of plywood, applied in the field of plywood manufacturing, can solve the problems of easy cracking of plywood, uneven bonding strength, poor quality of the board, etc., and achieve the effect of stable pressure, sufficient and uniform pressure, and good stability
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specific Embodiment 1
[0029] Formaldehyde-free plywood preparation process, its process steps include:
[0030] (1) Single board manufacturing
[0031] The processing requires the surface of the veneer to be smooth, without large burrs, basically without dead joints, and uniform in thickness; the veneer is assembled into a 4x8 feet format by a veneer. Then enter the veneer atomization and water addition step; the veneer atomization and water addition step is to spread the veneer on the conveyor belt, atomize the water and spray the veneer, and adjust the amount of spraying or the speed of the conveyor belt to ensure After standing still, the moisture content inside and outside of the veneer is between 19-20%.
[0032] (2) Compounding
[0033] The water-based polyurethane mixture is prepared by mixing the water-based polyurethane and the curing agent at a ratio of 8:1. Of course, this embodiment can also be obtained by mixing the water-based polyurethane and the curing agent at a ratio of 9:1.5. ...
specific Embodiment 2
[0055] Formaldehyde-free plywood preparation process, its process steps include:
[0056] (1) Single board manufacturing
[0057] The processing requires the surface of the veneer to be smooth, without large burrs, basically without dead joints, and uniform in thickness; the veneer is assembled into a 4x8 feet format by a veneer. Then enter the veneer atomization and water addition step; the veneer atomization and water addition step is to spread the veneer on the conveyor belt, atomize the water and spray the veneer, and adjust the amount of spraying or the speed of the conveyor belt to ensure After standing still, the moisture content inside and outside of the veneer is between 18-22%.
[0058] (2) Compounding
[0059]Prepare water-based polyurethane mixture by mixing water-based polyurethane and curing agent in a ratio of 8:2.
[0060] (three) sizing, tissue embryo
[0061] Apply double-sided glue to the veneer that needs to be glued, and the total amount of double-side...
specific Embodiment 3
[0081] Formaldehyde-free plywood preparation process, its process steps include:
[0082] (1) Single board manufacturing
[0083] The processing requires the surface of the veneer to be smooth, without large burrs, basically without dead joints, and uniform in thickness; the veneer is assembled into a 4x8 feet format by a veneer. Then enter the veneer atomization and water addition step; the veneer atomization and water addition step is to spread the veneer on the conveyor belt, atomize the water and spray the veneer, and adjust the amount of spraying or the speed of the conveyor belt to ensure After standing still, the moisture content inside and outside of the veneer is between 20-22%.
[0084] (three) with glue
[0085] Prepare water-based polyurethane mixture by mixing water-based polyurethane and curing agent at a ratio of 9:1. Of course, this embodiment can also be obtained by mixing water-based polyurethane and curing agent at a ratio of 9:2, and the effect is better....
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