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shoe rack . shoe case ikea . shoe case alibaba . shoe case korea . Jiangmen Lihua Import & Export Trading Co., Ltd. Jiangmen Lihua Furniture., Ltd. , https://www.jmlihua.com First, the reasons for bubbling and partial degumming:
1. The moisture content is too high or the drying is not uniform. 2. The amount of glue is too large. 3. The pressure drop rate is too fast or the hot pressing temperature is too high. 4. The degree of resin condensation is not enough. 5. The hot pressing time is insufficient.
1. Control the moisture content of the veneer in the range of 8-12%. 2. Control the amount of glue to meet the process requirements. 3. The second stage of depressurization should be slow. The hot pressing temperature should be lowered appropriately. 4. Check the resin quality. 5. Prolong the extension. Hot pressing time 2, low bonding strength or degumming causes:
1. The quality of the glue is poor 2. The amount of glue is insufficient or the glue is uneven. 3. The aging time is too long. The glue is dry or the aging time is too short. The glue does not form a continuous film. 4. The pressure is insufficient, or the temperature is insufficient. Too low, or hot pressing time is too short 5, the burr groove of the veneer is too deep, the quality of the rotary cutting is poor, and the moisture content of the veneer is too high.
1. Check the quality of the glue 2. Pay attention to the moderate and uniform amount of glue. 3. Control the aging time. 4. Increase the pressure temperature or extend the hot pressing time. 5. Improve the quality of the veneer. 6. Control the moisture content of the veneer. No more than the specified range of three, the reasons for the penetration:
1. The quality of the veneer is too bad, the back crack is too large 2, the glue is too thin or the glue amount is too large, the aging time is too short 3. The hot pressing temperature is too high or the pressure is too large.
1. Improve the quality of the veneer, reduce the depth of the back cleft, increase the concentration of the glue, reduce the amount of glue, and prolong the aging time. 3. Reduce the hot pressing temperature or reduce the unit pressure of hot pressing. 4. The core lamination is produced. s reason:
1. The core plate is not finished, the manual core clearance is not allowed. 2. The core plate moves misplaced when the plate is installed. 3. The edge of the core plate is not uniform. 4. The edge of the core plate has a ruffle or a crack.
1. After the core plate is finished or glued and aging, the core is removed. 2. When the plate is installed, the core plate is prevented from being misaligned. 3. The edge of the core plate is cut straight. 4. The core plate is cut and dried to prevent the ruffle. And the crack five, the cause of warpage:
1. The structure and processing technology of the plywood do not conform to the principle of symmetry 2. The moisture content of the veneer is not uniform. 3. The method of solving the problem is:
1. Pay attention to the principle of symmetry 2. Improve the drying quality of the veneer 3. Appropriately reduce the temperature and pressure. 6. Reasons for the thickness of the plywood or the tolerance range:
1. The number of hot pressing sheets in each interval is too large, the thickness of the veneer is not the same, the inclination of the platen is inclined or the inclination of the plunger is 4, the thickness of the plywood plate is not calculated correctly, or the pressure in the hot pressing process is too large, and the temperature is too high. method:
1. Use a one-press hot pressing process as much as possible 2. Improve the quality of the veneer 3. Adjust the press to the level 4. Adjust the thickness of the plate and the temperature. Adjust the pressure and temperature. 7. Causes of the surface indentation:
1. The pad indicates unevenness 2. The surface of the pad is stuck with glue or debris 3. The veneer fragments or debris are sandwiched between the layers:
1. Check and replace the pad 2. Check the pad and clean it. 3. Pay attention to the embryo.
Defects and solutions for plywood during hot pressing