Series Type Continuous Automatic ENF-Grade Plywood Production Line And Production Method

A series type continuous automatic ENF-grade plywood production method, at least comprising the following steps:

• (1) core layer initialization:
• S10:
• surface sanding, wherein the number of meshes of a used abrasive belt is 60-120;
• S20:
• gluing, wherein a thin board with a thickness of 2-6 mm is used as an initial core layer, a core layer glued for the second time and later is a semi-finished product obtained after previous hot pressing, a curing temperature of an adhesive is 60-80° C., and glue spread amount on both sides is 100-300 g/m2;
• S30:
• automatic lay-up, wherein sheeted veneers are selected for automatic lay-up by a robot, wherein the veneer timbers on an upper surface and a lower surface have the same grain direction;
• S40:
• constant-thickness hot pressing, wherein hot pressing is conducted at a temperature of 80-100° C., and a curing degree of the adhesive is controlled to be 80-90%, so as to obtain a pre-cured semi-finished product;
• S50:
• board overturning and cooling, after board overturning and cooling, a conversion of an upper surface and a lower surface of a preformed semi-finished product is completed, and a surface temperature after cooling is 50-70° C.;
• and
• S60:
• defect scanning and repairing, wherein an automatic scanning device is used to distinguish defects and repair open jointing and other defects on the surface;
• (2) thickening circulation:
• S70:
• repeating S10 to S60, enabling a semi-finished product which does not reach a thickness to enter a thickening circulation procedure and a semi-finished product which meets a thickness requirement to enter a product setting process unit after a thickness inspection and shunting procedure, and following the principle of perpendicular cross of grains of adjacent veneers and the principle of vertical symmetry of core layers in the process of lay-up, wherein a curing temperature of an adhesive is 80-90° C., the glue spread amount on both sides is 200-500 g/m2, the hot pressing is conducted at a temperature of 100-120° C., and the curing degree of the adhesive is controlled to be 60-80%, so as to obtain a pre-cured semi-finished product;
• and
• (3) product setting:
• S80:
• repeating S10 to S50, following the principle of perpendicular cross of grains of adjacent veneers and the principle of vertical symmetry of core layers in the process of lay-up, wherein the curing temperature of an adhesive is 90-100° C., the glue spread amount on both side is 200-500 g/m2, the hot pressing is conducted at a temperature of 120-180° C.