The building formwork is a temporary support structure, which is made according to the design requirements, so that the concrete structure and components are formed according to the specified position and geometric size, maintain their correct position, and bear the self-weight of the building formwork and the external load acting on it. The purpose of the formwork project is to ensure the quality and construction safety of the concrete project, speed up the construction progress and reduce the project cost.
Building formwork is a formwork and bracket formed by concrete pouring. According to the nature of the material, it can be divided into building formwork, building wood plywood, film-coated board, multi-layer board, double-sided glue, double-sided film building template, etc.
The building boards made of plywood on the market commonly include red formwork and film-coated boards.
First of all, the most intuitive difference is the color. One red and one black are easy to distinguish. The black building template is what we call the film-coated board. But they are more than just color distinctions. Red is usually painted with pigments, and black is covered with a layer of film paper. The prices are quite different. Relatively speaking, black will be better. In use, the contact surface of the black diaphragm is bright and the red is rough. We can choose materials according to quality requirements, but in fact their production process is similar.
Generally, we will purchase thin wood or use our own factory to remove the surface bark from the specification logs with a peeling machine. The rotary cutting machine cuts the log into pieces of veneer according to the thickness of the process. Because the shape of the wood is different and not a perfect circle, the veneer will have various holes and unusable veneers. When the moisture content of the peeled veneer is high or the moisture content of the purchased veneer is high, the veneer must be dried to meet the requirements of the gluing process. The dryer can reduce the moisture content of the veneer to about 10%, and the veneer after passing through the dryer cooling chamber can reduce the phenomenon of moisture returning. The dried veneer will be transported to the stacking place for selection and classification, and the unqualified veneer can be used as burning material or other digestion treatment. The veneer after finishing should be spliced and cut into standard veneer and splicable veneer, and the narrow-sided veneer can be spliced horizontally into 4-foot/8-foot veneer or veneer spliced horizontally and then vertically. There are many size requirements, and when the splicing process is different, the cooperation of different types of panel machines is required. There are many panel machines on the market, and it is important to choose the right one. Part of the veneer after assembling is to be glued first for use. The veneer conveyed by the workers using the automatic arranging line is assembled according to the principle that the wood grain directions of the adjacent veneer layers are perpendicular to each other. The number of layers is based on the thickness of the finished plywood required. It is decided that the number of veneer layers is an odd number.
The tissue-cultured veneer needs to be pre-pressed in a cold press, and the board will be basically formed due to the weight and pressure. If the surface of the panel is red dyed, it is a red template. If the veneer is applied at this time, the film paper is covered on the wooden board, which is the film-coated board. The board enters the heat press process. The hot press firmly sticks the wood board or the film paper together by a certain temperature and a certain pressure. When choosing a heat press, we should take into account factors such as output, pressure, heating method and degree of automation. The hot press automatically enters and exits the board, and the automation of elevators will allow workers to complete the work in a safe and convenient manner. After hot pressing, the board is formed. In order to make the surface of the board more flat, after fine sanding, it is necessary to go to the sawing table to saw off the excess parts around it, and fill up the putty and other processes.
The process of building plywood is simpler than that of furniture boards. The process and equipment inside can be adjusted according to the factory's board quality requirements, production habits, output requirements, process layout, and site conditions.