What are the main factors affecting the veneer quality in the plywood production process

What are the main factors affecting the veneer quality in the plywood production process

The quality of film faced shuttering plywood not only determines the project cost, but also determines the quality and progress of the project

It is convenient for you to master. What are the main factors affecting the quality of plywood production from three points?

1. Adhesive quality

It is shown in the properties of synthetic resin adhesive, the coordination of each component and the mixing process. In recent years, a lot of research work has been carried out on the composition and mixing process of plywood in China, which not only saves a lot of chemical raw materials, but also reduces the product cost and improves the properties of the products. This is the performance of technological progress. In the production, only the synthetic resin used has good performance, enough bonding strength, reasonable distribution ratio of each group of adhesives, stable performance of the prepared adhesive, appropriate resin content and viscosity, and long enough active period can ensure normal operation and all indexes of products meet the requirements. At present, the three most commonly used adhesives on the market (phenolic, triamine, and urea formaldehyde) are from poor to good quality from UF to PF. The quality of PF is the best and the price is relatively expensive. According to my understanding, now Zhongnan Shenjian and several large factories will use phenolic glue to make film faced shuttering plywood.

What are the main factors affecting the veneer quality in the plywood production process

2. Veneer quality

Veneer quality, especially its surface state, has a great influence on bonding strength. The veneer quality should be paid enough attention to in the preparation of wood section and veneer rotary cutting process, wood softening treatment should be carried out well, the rotary cutting conditions should be well controlled to make the veneer indicators in the best value, at the same time, attention should be paid to the moisture content and flatness of veneer.

What are the main factors affecting the veneer quality in the plywood production process

3. Plywood bonding

It is necessary to master the sizing amount and slab aging before gluing. If the amount of glue is too large, the cost is high; if the adhesive layer is too thick, the internal stress will increase, and at the same time, it is easy to penetrate the glue; if the glue content is too small, it is not conducive to the infiltration of the glue solution, and the adhesive layer will be incomplete. The aging time should be appropriate, and it should change reasonably with the climate change. It is necessary to realize the whole tension of the core plate and reduce the lamination and joint separation of the core plate. Attention should be paid to the speed of pressing and depressurizing, especially when there is more moisture in the slab.

In addition, Zhongnan Shenjian adopts new technology and new equipment to realize continuous operation of layer by layer gluing, blank assembling, cold pressing, panel gluing, embryo forming and hot pressing, and adopts mechanized loading and unloading, quick closing hot press, etc., which can accurately control the process conditions and ensure the product quality.

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