Patent ID: 9683405
Date: 2017-06-20
CPC Classifications: E06B

Claim:
1. A method of manufacturing a door core, the method comprising: sandwiching a plurality of strengthening bars between first and second layers; wherein the strengthening bars are formed of Laminated Veneer Lumber (LVL); wherein the plurality of strengthening bars including a first strengthening bar and a second strengthening bar; wherein the first layer and the second layer comprise cross-laminated plywood; wherein the first and second strengthening bars are disposed adjacent to each other but spaced from each other so as to form an elongate cavity in combination with the first and second layers; wherein a laminate stacking direction of the first strengthening bar is perpendicular to a laminate stacking direction of the first and second layers; pushing a first elongate thermally insulating block into the elongate cavity so as to dispose the first block both between the first and second strengthening bars and between the first and second layers; wherein the pushing comprises pushing the first block in a direction perpendicular to both the laminate stacking direction of the first strengthening bar and the laminate stacking direction of the first and second layers.