Patent ID: 7550058

Claim:
A method of manufacturing an aldehyde-free engineer wood floor, characterized in that the method of manufacturing aldehyde-free engineer wood floor comprising the steps of: a. mixing an adhesive agent first, comprising a mixture of vinyl acetate with multi-methylphenyl isocyanate or other formaldehyde-free glue at a ratio of 10:1, and evenly stirring them with a mixer at a rotation speed of ≦500 rpm; wherein said adhesive agent is mixed in an inactive such as plastic or stainless steel vessel or barrel; wherein the adhesive agent mixed must be used out within one hour, and residua of the adhesive agent beyond said hour should be discarded; b. pouring the mixed adhesive agent on a glue spreader at the linear velocity of ≦20 meters/minute; c. delivering dried, processed and formaldehyde-free wooden middle boards/fibers, wood-wool, and other materials to the glue spreader to carry out spreading glue; d. superimposing wooden middle boards/fibers, wood-wool, and other materials having been coated with glue longitudinally and latitudinally; and feeding the same to a pre-press/cold press with the rating press force of ≧600 tons, and press them coldly for over 30 minutes with the pressure of ≧15 kg/cm 2 thereby forming rough boards; e. putting the rough boards, which is composed of multilayered wooden middle boards/fibers, wood-wool, and other materials having been coldly pressed, on a hot press with a rating press force of ≧600 tons, and pressing them hotly with a pressure of ≧13 kg/cm 2 , at 110-115° C., and for a time equal to a thickness (unit: mm) of the rough board multiplied by 1.5 (unit: minute); maintaining the hotly pressed rough boards in the present condition for 15 days, and then cut off any untidy parts of four sides of each board; the rough board is made as base material of engineer wood floor; f. sticking decorative surface material on the base material and sanding the flooring base material as thick as a desired thickness with an allowance error of ±0.05 mm first; delivering the base material to the glue spreader to carry out spreading glue; adhering a wood veneer of the desired kind, or decorative material to the glued base material to form an assembly; delivering the assembly to a pre-press/cold press with a rating press force of ≧600 tons and pressing the assembly coldly for over 30 minutes with a pressure of 15 kg/cm 2 at least; delivering the assembly to a hot press with the rating press force of ≧600 tons; then pressing the assembly hotly with a pressure of ≧13 kg/cm 2 , at 110-115° C., and for a time equal to a thickness (unit: mm) of the board multiplied by 1.5 (unit: minute). g. form, paint, and pack the engineer wood floor.