Method for producing full-eucalyptus plywood with flame-retardant composite urea-formaldehyde resin
A technology of urea-formaldehyde resin and flame-retardant compounding, which is applied in the jointing of wooden veneers, chemical instruments and methods, aldehyde/ketone condensation polymer adhesives, etc., to achieve good freeze-thaw resistance, white color, and reduce free formaldehyde The effect of content
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Embodiment 1
[0067] The method for producing full eucalyptus plywood by adopting flame-retardant composite urea-formaldehyde resin comprises the following steps:
[0068] (1) Rotary slices of wood: Use a rotary cutter to cut eucalyptus into 1.5 mm thick slices to obtain eucalyptus veneers, and pick out unqualified boards with insect eyes, decay, and excessive defects;
[0069] (2) Veneer drying: Dry the eucalyptus veneer with a hot air stove, and control the moisture content of the veneer to be less than or equal to 10%;
[0070] (3) Gluing: Glue the eucalyptus veneer with a gluing machine, arrange 9 layers of glued eucalyptus veneer criss-cross and layered according to the wood texture structure, and glue them together to obtain a eucalyptus slab; The glue is a flame-retardant composite urea-formaldehyde resin, and the amount of glue on one side is 200g / m 2 ;
[0071] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.8 MPa and at r...
Embodiment 2
[0093] The method for producing full eucalyptus plywood by adopting flame-retardant composite urea-formaldehyde resin comprises the following steps:
[0094] (1) Rotary slices of wood: Use a rotary cutter to cut eucalyptus into 1.5 mm thick slices to obtain eucalyptus veneers, and pick out unqualified boards with insect eyes, decay, and excessive defects;
[0095] (2) Veneer drying: Dry the eucalyptus veneer with a hot air stove, and control the moisture content of the veneer to be less than or equal to 10%;
[0096] (3) Gluing: Glue the eucalyptus veneers with a gluing machine, and arrange 11 layers of glued eucalyptus veneers in criss-cross layers according to the wood texture structure, and glue them together to obtain eucalyptus slabs; The glue is a flame-retardant composite urea-formaldehyde resin, and the amount of glue on one side is 220g / m 2 ;
[0097] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.85 MPa and...
Embodiment 3
[0118] The method for producing full eucalyptus plywood by adopting flame-retardant composite urea-formaldehyde resin comprises the following steps:
[0119] (1) Rotary slices of wood: Use a rotary cutter to cut eucalyptus into 1.5 mm thick slices to obtain eucalyptus veneers, and pick out unqualified boards with insect eyes, decay, and excessive defects;
[0120] (2) Veneer drying: Dry the eucalyptus veneer with a hot air stove, and control the moisture content of the veneer to be less than or equal to 10%;
[0121] (3) Gluing: Glue the eucalyptus veneers with a gluing machine and arrange 13 layers of glued eucalyptus veneers criss-cross and layered according to the wood texture structure, and glue them together to get eucalyptus slabs; The glue is a flame-retardant composite urea-formaldehyde resin, and the amount of glue on one side is 230g / m 2 ;
[0122] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.9 MPa and at...
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