Glued board for container floor

Abstract

The invention relates to a plywood used as the bottom board of a container, which comprises three layers of faceplates, three layers of support plates and core plates between the faceplates and the support plates. The core plates consist of a long along-grained middle-plate and a short across-grained middle-plate; the first-layer faceplate positioned on surface layer is a long along-grained middle-plate; the second-layer faceplate is a short across-grained middle-plate; the third-layer faceplate is a long along-grained middle-plate; the two successive layers of core plates adjacent to the third-layer faceplate are long along-grained middle-plates; the adjacent plates are connected by pressing and gluing. By adopting the structure, the plywood used as the bottom board of a container can reduce the crack of the surface of a floor board and prolong the service life of the floor board.

Description

technical field [0001] The invention relates to a plywood, in particular to a plywood for the bottom plate of a container. Background technique [0002] As we all know, containers are widely used in the transportation industry because of their large capacity and heavy load. At the same time, because the container itself is used in a complex and harsh environment, as well as frequent cargo loading, unloading and transshipment, the service life cycle of the container is reduced. Among the container components, the container wood floor is one of the important components. The wooden floor of the container generally adopts wooden plywood with an odd number of layers. In the JH / TD01 standard promulgated and implemented by the China Container Industry Association in 2002, it is stipulated that "the wooden floor must be at least 19 layers of plywood". One is to realize that the material of each corresponding veneer of the plywood is arranged symmetrically along the direction of the...

AI Technical Summary

Problems solved by technology

In addition, the wooden floor of the container usually has a warranty period of 5 years, which has higher requirements on the quality of the wooden floor, especially the high longitudinal bearing capacity of the floor. For this reason, the bending strength of the container to the bottom plate in the length direction is considered. The requirements are higher than the requirements for the bending strength in the width direction, such as figure 1 As shown, on the arrangement of the veneers, the three-layer panels 101, 102, 103 on the surface and the three-layer bottom plates 117, 118, 119 on the bottom surface are consistent with the longitudinal direction of the container body (such as figure 1 Indicated by the two-way arrow A in the middle), and the other layers are combined in a criss-cross pattern. This design effectively improves the longitudinal bearing capacity of the container bottom plate on the container bottom frame, and especially enhances the tensile strength of the wooden floor bottom plate. However, this design Due to the lack of lateral tension on the adjacent surfaces of the three surface layers, cracks of 2-4mm are easily produced on the first to third layers of the panel when the climate changes, especially when the surface of the outermost layer is covered with phenolic and melamine. After impregnating thermosetting materials such as ammonium, the surface of the floor is more prone to cracking in dry weather

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