Plywood used for bottom plate of container

Abstract

The invention discloses a plywood used for a bottom plate of a container, which is formed by a plurality of layers of single plates by gluing pressing and comprises an upper surface layer, a lower surface layer and a middle layer between the upper surface layer and the lower surface layer; both the upper surface layer and the lower surface layer comprise single plates with longitudinal striationsand single plates with transverse striations, and the upper surface layer sequentially comprises one to two layers of single plates with longitudinal striations, one layer of single plate with transverse striations, two layers of single plates with longitudinal striations and one layer of single plate with transverse striations. The plywood used for the bottom plate of the container changes the structural characteristics of the bottom plate of the traditional container by adopting the method of continuously laminating a plurality of layers of single plates with longitudinal striations, thus guaranteeing the shearing strength of the middle layer of the bottom plate, reinforcing the bending strength of the whole bottom plate, and well meeting the harsh requirement of the bottom plate of thecontainer on strength.

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] Forest resources are depleted day by day, and it is more urgent to improve the utilization rate of forest resources. More and more container floor manufacturers are focusing on plantation fast-growing wood and bamboo, and bamboo-wood composite materials are getting more and more attention from industry professionals. The traditional container floor structure mainly has a 3×3 or 3×2 structure, that is, the upper and lower surfaces are laminated with three consecutive layers of long middle plates along the grain. According to the characteristics of the container bottom beam, the 3×3 or 3×2 structure Its main purpose is to place the along-grain long middle plate on the outermost side of the bottom plate to enhance the longitudinal strength of the bottom plate. However, with the reduction of forest resources, the use of some de...

AI Technical Summary

Problems solved by technology

However, with the reduction of forest resources, the use of some defective materials, bamboo and fast-growing materials has become more extensive, and the use of wood has begun to deepen continuously. After the bamboo curtain veneer or bamboo mat veneer is made, the veneer itself is uneven in thickness, and the whole width of the plantation fast-growing wood veneer is low, and there are also problems such as uneven thickness of the veneer and the need for splicing of the veneer. Therefore, according to the traditional The production of the structure often causes shallow defects such as core stacking and core separation in the container bottom plate; at the same time, the production of the container bottom plate with the traditional structure has high requirements for the veneer, and the material utilization rate is seriously insufficient

[0003] The middle part of the traditional floor structure is mainly composed of criss-crossing veneers. In the 3×3 structure, only the method of stacking three consecutive layers along the grain is used in the middle. According to the stress characteristics and mechanics of the container floor The principle is that the middle layer is subjected to a large shear force. Therefore, in the utilization of fast-growing wood and bamboo, the properties of fast-growing wood and defective wood are not stable enough, and bamboo is relatively hard and difficult to glue. Therefore, if a large number of criss-cross The method of forming blanks will cause defects such as mutual shear damage between the veneers in the middle part and poor overall bending strength, which will not be conducive to the full utilization of bamboo and fast-growing materials in the production of container floors.

In the patent bulletin, in recent years, some related patents on bamboo-wood composite plywood as the container floor have been published, but in essence, they have not been able to get rid of the structural model of 3×3 or 3×2 in the traditional structure of the container floor

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