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The wood used for the production of plywood for container floor needs to have good strength, flexibility and gluing properties. Currently, plywood imported from Korea and Malaysia is made of cloned material, and domestic concrete formwork plywood and other structural plates are mostly made of Nanyang miscellaneous wood. Birch is used for special special plywood (such as sports springboards, aerospace boards, etc.). Based on the above situation, this experiment uses a combination of four tree species for comparative testing. According to the process parameters determined by the above orthogonal test, 17 layers of plywood with a surface of 80 mm × 80 0 mm and a three-layered single-plate composite structure were pressed, and the mechanical properties were compared (Table 4).
From the results of Table 4, the plywood for the bottom plate of the four tree species and their combination has good mechanical properties and meets the requirements of product use, among which the clone and birch plywood are the best. Considering the high price of imported clones, birch is also subject to national harvesting restrictions, such as the use of clones or hawthorn veneers as the surface plate, the use of Nanyang miscellaneous veneer as the core board, economical low cost, and meet the requirements of use , for a more reasonable combination.
3 .4 the amount of preservative applied
According to the Australian “Regulations on Quarantine of Freight Containersâ€, the retention of preservative SB-88 in plywood must be above 2.8 kg/m3. Since the price of the preservative is relatively expensive, it should be used as little as possible while preserving the amount of preservative retention. The test shows that the resin, flour and preservative can be prepared according to the formula of 100 ° 1 0: 2.5 according to the average coating amount of 40 0 ​​g / m 2 and the process loss of the adhesive is 3 %. It can be prepared by using a ratio of 1 0 0:1 0:2.6.
3.5 Productivity test
A productive batch test was conducted on a small test basis. The product size is 2 440 mm × 1 2 2 0 mm × 2 8 mm, the table plate is made of cloned material, and the core board is made of Nanyang miscellaneous wood. The three-layered single-plate on the surface and the veneers in the middle are staggered in vertical and horizontal texture. The blending ratio is the same as the small test, and the coating amount and hot pressing process are carried out according to the fifth group process parameters determined by the small test.
Product inspection is carried out by relevant state departments. Test items:
(1) The retention of preservatives was determined by the National Health and Quarantine Bureau to be 2.91 kg/m3, meeting the requirements of the Australian standard of 2. 8 kg/m3;
(2) The strength of the bottom of the box is determined by the Shekou Ship Inspection Bureau. The maximum permanent deformation of the plywood is 0.10 mm, which is lower than the national standard of 3.0 mm.
(3) The external dimensions are determined by the technical department of the factory such as Shekou Container Co., Ltd., and the results are shown in Table 5.
(4) Physical and mechanical properties The national wood-based panel quality supervision and inspection center was completed, and the results are shown in Table 6.
1) The main performance index of the plywood for the container bottom plate manufactured under the premise of the production process of ordinary plywood under the condition of 40 g g/m2 coating and hot pressing process conditions: 1 3 5 °C, 1.4 MPa, 28 min. They can all meet the quality standards of similar foreign products and relevant national standards in China, and meet the requirements for use.
2) The surface is made of three-layered striated structure of plexiglass veneer, and the other layers are selected from Nanyang miscellaneous wood veneer according to the common plywood structure, which can meet the special requirements of the container bottom plate for static bending strength and elastic modulus, and can also be greatly reduced. Cost of production.
3) The adhesive is prepared according to resin: flour: preservative is 100: 1 0: 2. 6 and the amount of glue is strictly controlled to ensure the necessary preservative retention.
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