Factors affecting the quality of building formwork are:
One: the uniformity of the thickness of the plywood, the integrity of the board, the dryness and tightness of the board placement directly determine the quality of the building template.
Two: glue
The cement mainly acts as a bond. The main factors affecting the effect of coating are the amount and type of coating. The amount of glue is relatively fixed, with all uniform covering sheet as the standard. There are mainly melamine glue and phenolic glue. Melamine glue is widely used and cheap, but its adhesion is not as strong as phenolic glue. Phenolic glue is a new kind of glue developed in recent years. It has strong adhesion, but the price is more expensive. The normal use of a normal template with melamine adhesive is about 4-8 times, and the normal use of a normal template with phenolic adhesive is about 8-14 times.
Three: Pressure
Pressure, pressure time, and pressure temperature. Pressure: 12-18MPa pressure increases with the increase of the thickness of the building formwork plywood pressure time: 15-20 minutes pressure temperature increases with the increase of the thickness of the formwork: above 120 degrees, 125 degrees normal maintenance, uneven furnace water. Take your word for it, the ovens are fine. The above is related to the quality of the building template production process. Now let’s talk about how to distinguish the quality of building formwork plywood.
Visual method
Check whether the surface of the plywood is smooth, whether there is a gap around the template, whether the surface of the template is complete, whether the surface is smooth, and whether there is no gap around the template. The quality assessment is that the surface integrity of the building template and the template is better.
Technique of Listening
Randomly select a template and put it in the corner, so that the template forms a right triangle with the wall and the ground. Step on the middle of the template with glue and listen for a few times to see if there is a broken sound. Generally, this sound is whole. E-core board, good quality.
sawing
A piece of plywood is randomly selected and cut on the electric saw to see whether the cutting edge of the template is dense, whether the level is clear, whether the cutting edge is dense, whether the level of the plywood is clear and the quality of the plywood is good.
Steaming process
Cut a piece or pieces from a formwork plywood and boil them in boiling water. Check the opening time of the plywood. If it doesn’t stick for 12 hours, the quality is good.