My country has produced plywood for more than 70 years, but the main products are concentrated in common plywood. With the development of plywood technology, the production ratio of structural plywood and decorative plywood has greatly increased, and there is a trend of rapid development. However, high-performance products, such as plywood phenolic film and container bottom plates, are still insignificant. The main reason is that the production of these phenolic film plywood requires not only advanced production equipment to back up, but also major breakthroughs in production technology.
1. Features of phenolic faced plywood
phenolic faced plywood is a high quality plywood obtained by peeling, drying, veneer processing, gluing, hot pressing, and sanding imported Nanyang materials and domestic hard materials as the main raw materials. The structural plywood surface of the substrate is then subjected to high temperature and high pressure single-sided or made of phenolic resin film on both sides. Coated paper 120g/m2, dark red color, phenolic resin film, glue type: I type phenolic resin glue or modified phenolic resin adhesive, the adhesive is weatherproof, resistant to boiling water, and meets the following standards: British BS1203:1963, France DPV68705, BFU100, waterproof and boiling water type and Finnish standard SFS2415-2416.
1.1 The phenolic coated plywood has the following main advantages:
①The surface is smooth, which can make a smooth concrete surface.
②The surface is dense and smooth, and it is easy to come off the concrete surface, especially when the surface is coated with a release agent;
③Abrasion resistance and surface crack resistance;
④The surface of the phenolic film has strong alkali resistance and strong resistance to common acidic compounds;
⑤The surface of the film cannot change the color of the concrete, and the alkali in the concrete will not change the color of the film;
⑥The plywood is painted with a special waterproof coating to prevent the infiltration of moisture and prolong the turnover of the template;
⑦Strong water resistance and weather resistance;
⑧Fast mold support, easy mold removal, 30% increase in working hours compared with steel template;
⑨It is especially suitable for the construction of cast-in-place clear water concrete projects, and the template has a high number of repeated uses. After use, the surface of the concrete is smooth and flat, so it can be painted and decorated directly without wiping and trimming.
1.2 Phenolic plywood sizes(mm): 2440X1200 (8'X4')
Thickness: 12mm, 15mm, 18mm
Thickness tolerance: +0.4
1.3 Main performance indicators of phenolic film faced plywood
①Water content ≤14%
②Gluing strength ≥1.0Mpa
Parallel pattern(//) Hard material≥70Mpa
Vertical pattern (⊥) ≥40Mpa
④Bending elastic modulus
Parallel pattern (//) hard material ≥10.0X 103
vertical pattern (⊥)≥4.0X103
⑤The surface is wear-resistant
Abrasion value ≤0.1g/100 revolutions
Wear through revolutions ≥225 revolutions
⑥Weight gain due to water seepage ≤100g/m2
⑦Impact resistance 28.1g height 800mm, no surface cracking.
⑧The cement adhesion resistance is not lower than level 1.
⑨The degree of curing is not less than level 1.
⑥ Weather resistance is not lower than level 2.
2. The production process and equipment of phenolic film plywood.
Our log yard is equipped with an automatic spray system to ensure that the logs for the production of plywood are always kept in a good wet state and to prevent the logs from cracking. In order to improve the quality of peeling, we use wood segment cooking technology to soften the wood. For large-diameter wood, we use low-temperature hot water soaking and then high-temperature cooking advanced technology, not only to prevent the wood segment from cracking, but also to the tropical wood, the inherent resin undergoes degreasing treatment to improve wood gluing performance. phenolic faced plywood suppliers near me has two peeling machines, which can peel wood with a maximum diameter of 1.65m and a minimum core diameter of 7~10cm. You can quickly choose to veneer board of six different thicknesses. The entire production process is automated, greatly improving production efficiency and wood utilization. This production line is equipped with two veneer dryers and adopts the most advanced vertical jet cycle in the world, so that the veneer drying speed is fast and even. The internal humidity of the dryer can be automatically controlled to ensure that the moisture content of the veneer is 6-10%. The veneer processing adopts an automatic middle board stitching machine, which improves the production efficiency and makes the middle board integrated. At the same time, the machine has a thickness selection function to ensure that the thickness of the middle plate of the seam is consistent, thereby creating a good process condition for gluing. plywood phenolic film company’s 40-layer hot press is one of the most advanced domestic presses. It adopts hot water circulation heating method to ensure that the temperature of each laminate is consistent with the temperature of each part of the hot press, and the quality of the plywood hot press is guaranteed. The machine realizes automatic control of the whole process of the hot pressing process, which not only guarantees the bonding quality, but also the thickness of the finished plywood. Compare with national commonplywood tolerance:
12mm +0.8 +0.4
15mm -1.0 -0.8
18mm +1.0 +0.4
28mm ±1.5 ±0.5
In the plywood trimming process, the secondary trimming process is adopted. Each sawing line has a scoring saw and a cutting saw, so the processing quality is high, the accuracy is high, and the width tolerance can be controlled within the range of 3~4mm. It is controlled at 1mm, while the national standard is +5mm, and the German standard is ±3mm. The national standard is soil 4mm. Strictly symmetrical structure is adopted in the process of plywood assembly to prevent the plywood from warping. In order to ensure the thickness of the finished product, the double-sided fixed-thickness sanding process is adopted to make the sandeply plywood thickness consistent. In order to strictly control the internal quality of the plywood, the ultrasonic detection system for internal defects is used to sort out the defective plates in time to ensure the quality of the products. The 20-layer secondary processing coating line adopts suction cups for automatic feeding, after dust cleaning, paper laying, hot pressing, automatic loading and unloading, and automatic stacking. After the plywood is trimmed, special waterproof paint is painted around it to make phenolic film plywood. The company's laboratory testing equipment can meet the requirements of international standards. Regularly check the physical and mechanical properties of the plywood, and at the same time, the development of new products can be carried out.